Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
3bf2789c | 44 | #include <linux/parser.h> |
e114e473 CS |
45 | #include "smack.h" |
46 | ||
5c6d1125 JS |
47 | #define TRANS_TRUE "TRUE" |
48 | #define TRANS_TRUE_SIZE 4 | |
49 | ||
c6739443 CS |
50 | #define SMK_CONNECTING 0 |
51 | #define SMK_RECEIVING 1 | |
52 | #define SMK_SENDING 2 | |
53 | ||
21abb1ec | 54 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 | 55 | LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 56 | #endif |
1a5b472b | 57 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 58 | int smack_enabled; |
c6739443 | 59 | |
d166c802 | 60 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
bf4b2fee CS |
61 | static char *smk_bu_mess[] = { |
62 | "Bringup Error", /* Unused */ | |
63 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
64 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
65 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
66 | }; | |
67 | ||
3bf2789c VT |
68 | static const match_table_t tokens = { |
69 | {Opt_fsdefault, SMK_FSDEFAULT "%s"}, | |
70 | {Opt_fsfloor, SMK_FSFLOOR "%s"}, | |
71 | {Opt_fshat, SMK_FSHAT "%s"}, | |
72 | {Opt_fsroot, SMK_FSROOT "%s"}, | |
73 | {Opt_fstransmute, SMK_FSTRANS "%s"}, | |
74 | {Opt_error, NULL}, | |
75 | }; | |
76 | ||
d166c802 CS |
77 | static void smk_bu_mode(int mode, char *s) |
78 | { | |
79 | int i = 0; | |
80 | ||
81 | if (mode & MAY_READ) | |
82 | s[i++] = 'r'; | |
83 | if (mode & MAY_WRITE) | |
84 | s[i++] = 'w'; | |
85 | if (mode & MAY_EXEC) | |
86 | s[i++] = 'x'; | |
87 | if (mode & MAY_APPEND) | |
88 | s[i++] = 'a'; | |
89 | if (mode & MAY_TRANSMUTE) | |
90 | s[i++] = 't'; | |
91 | if (mode & MAY_LOCK) | |
92 | s[i++] = 'l'; | |
93 | if (i == 0) | |
94 | s[i++] = '-'; | |
95 | s[i] = '\0'; | |
96 | } | |
97 | #endif | |
98 | ||
99 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
100 | static int smk_bu_note(char *note, struct smack_known *sskp, |
101 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
102 | { |
103 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
104 | ||
105 | if (rc <= 0) | |
106 | return rc; | |
bf4b2fee CS |
107 | if (rc > SMACK_UNCONFINED_OBJECT) |
108 | rc = 0; | |
d166c802 CS |
109 | |
110 | smk_bu_mode(mode, acc); | |
bf4b2fee | 111 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 112 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
113 | return 0; |
114 | } | |
115 | #else | |
21c7eae2 | 116 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
117 | #endif |
118 | ||
119 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
120 | static int smk_bu_current(char *note, struct smack_known *oskp, |
121 | int mode, int rc) | |
d166c802 CS |
122 | { |
123 | struct task_smack *tsp = current_security(); | |
124 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
125 | ||
126 | if (rc <= 0) | |
127 | return rc; | |
bf4b2fee CS |
128 | if (rc > SMACK_UNCONFINED_OBJECT) |
129 | rc = 0; | |
d166c802 CS |
130 | |
131 | smk_bu_mode(mode, acc); | |
bf4b2fee | 132 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
133 | tsp->smk_task->smk_known, oskp->smk_known, |
134 | acc, current->comm, note); | |
d166c802 CS |
135 | return 0; |
136 | } | |
137 | #else | |
21c7eae2 | 138 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
139 | #endif |
140 | ||
141 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
142 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
143 | { | |
144 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 145 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
146 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
147 | ||
148 | if (rc <= 0) | |
149 | return rc; | |
bf4b2fee CS |
150 | if (rc > SMACK_UNCONFINED_OBJECT) |
151 | rc = 0; | |
d166c802 CS |
152 | |
153 | smk_bu_mode(mode, acc); | |
bf4b2fee | 154 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 155 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
156 | current->comm, otp->comm); |
157 | return 0; | |
158 | } | |
159 | #else | |
160 | #define smk_bu_task(otp, mode, RC) (RC) | |
161 | #endif | |
162 | ||
163 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
164 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
165 | { | |
166 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 167 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
168 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
169 | ||
bf4b2fee CS |
170 | if (isp->smk_flags & SMK_INODE_IMPURE) |
171 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
172 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
173 | ||
d166c802 CS |
174 | if (rc <= 0) |
175 | return rc; | |
bf4b2fee CS |
176 | if (rc > SMACK_UNCONFINED_OBJECT) |
177 | rc = 0; | |
178 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
179 | (mode & (MAY_WRITE | MAY_APPEND))) | |
180 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
181 | |
182 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
183 | |
184 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
185 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
186 | inode->i_sb->s_id, inode->i_ino, current->comm); |
187 | return 0; | |
188 | } | |
189 | #else | |
190 | #define smk_bu_inode(inode, mode, RC) (RC) | |
191 | #endif | |
192 | ||
193 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
194 | static int smk_bu_file(struct file *file, int mode, int rc) | |
195 | { | |
196 | struct task_smack *tsp = current_security(); | |
197 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 198 | struct inode *inode = file_inode(file); |
bf4b2fee | 199 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
200 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
201 | ||
bf4b2fee CS |
202 | if (isp->smk_flags & SMK_INODE_IMPURE) |
203 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
204 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
205 | ||
d166c802 CS |
206 | if (rc <= 0) |
207 | return rc; | |
bf4b2fee CS |
208 | if (rc > SMACK_UNCONFINED_OBJECT) |
209 | rc = 0; | |
d166c802 CS |
210 | |
211 | smk_bu_mode(mode, acc); | |
bf4b2fee | 212 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 213 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 214 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
215 | current->comm); |
216 | return 0; | |
217 | } | |
218 | #else | |
219 | #define smk_bu_file(file, mode, RC) (RC) | |
220 | #endif | |
221 | ||
222 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
223 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
224 | int mode, int rc) | |
225 | { | |
226 | struct task_smack *tsp = cred->security; | |
227 | struct smack_known *sskp = tsp->smk_task; | |
228 | struct inode *inode = file->f_inode; | |
bf4b2fee | 229 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
230 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
231 | ||
bf4b2fee CS |
232 | if (isp->smk_flags & SMK_INODE_IMPURE) |
233 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
234 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
235 | ||
d166c802 CS |
236 | if (rc <= 0) |
237 | return rc; | |
bf4b2fee CS |
238 | if (rc > SMACK_UNCONFINED_OBJECT) |
239 | rc = 0; | |
d166c802 CS |
240 | |
241 | smk_bu_mode(mode, acc); | |
bf4b2fee | 242 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 243 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 244 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
245 | current->comm); |
246 | return 0; | |
247 | } | |
248 | #else | |
249 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
250 | #endif | |
251 | ||
e114e473 CS |
252 | /** |
253 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 254 | * @name: type of the label (attribute) |
e114e473 CS |
255 | * @ip: a pointer to the inode |
256 | * @dp: a pointer to the dentry | |
257 | * | |
e774ad68 LP |
258 | * Returns a pointer to the master list entry for the Smack label, |
259 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 260 | */ |
2f823ff8 CS |
261 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
262 | struct dentry *dp) | |
e114e473 CS |
263 | { |
264 | int rc; | |
f7112e6c | 265 | char *buffer; |
2f823ff8 | 266 | struct smack_known *skp = NULL; |
e114e473 CS |
267 | |
268 | if (ip->i_op->getxattr == NULL) | |
e774ad68 | 269 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 270 | |
f7112e6c CS |
271 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
272 | if (buffer == NULL) | |
e774ad68 | 273 | return ERR_PTR(-ENOMEM); |
e114e473 | 274 | |
f7112e6c | 275 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
276 | if (rc < 0) |
277 | skp = ERR_PTR(rc); | |
278 | else if (rc == 0) | |
279 | skp = NULL; | |
280 | else | |
2f823ff8 | 281 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
282 | |
283 | kfree(buffer); | |
284 | ||
2f823ff8 | 285 | return skp; |
e114e473 CS |
286 | } |
287 | ||
288 | /** | |
289 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 290 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
291 | * |
292 | * Returns the new blob or NULL if there's no memory available | |
293 | */ | |
1eddfe8e | 294 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
295 | { |
296 | struct inode_smack *isp; | |
297 | ||
1a5b472b | 298 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
299 | if (isp == NULL) |
300 | return NULL; | |
301 | ||
21c7eae2 | 302 | isp->smk_inode = skp; |
e114e473 CS |
303 | isp->smk_flags = 0; |
304 | mutex_init(&isp->smk_lock); | |
305 | ||
306 | return isp; | |
307 | } | |
308 | ||
7898e1f8 CS |
309 | /** |
310 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
311 | * @task: a pointer to the Smack label for the running task |
312 | * @forked: a pointer to the Smack label for the forked task | |
313 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
314 | * |
315 | * Returns the new blob or NULL if there's no memory available | |
316 | */ | |
2f823ff8 CS |
317 | static struct task_smack *new_task_smack(struct smack_known *task, |
318 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
319 | { |
320 | struct task_smack *tsp; | |
321 | ||
322 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
323 | if (tsp == NULL) | |
324 | return NULL; | |
325 | ||
326 | tsp->smk_task = task; | |
327 | tsp->smk_forked = forked; | |
328 | INIT_LIST_HEAD(&tsp->smk_rules); | |
329 | mutex_init(&tsp->smk_rules_lock); | |
330 | ||
331 | return tsp; | |
332 | } | |
333 | ||
334 | /** | |
335 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
336 | * @nhead: new rules header pointer |
337 | * @ohead: old rules header pointer | |
338 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
339 | * |
340 | * Returns 0 on success, -ENOMEM on error | |
341 | */ | |
342 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
343 | gfp_t gfp) | |
344 | { | |
345 | struct smack_rule *nrp; | |
346 | struct smack_rule *orp; | |
347 | int rc = 0; | |
348 | ||
349 | INIT_LIST_HEAD(nhead); | |
350 | ||
351 | list_for_each_entry_rcu(orp, ohead, list) { | |
352 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
353 | if (nrp == NULL) { | |
354 | rc = -ENOMEM; | |
355 | break; | |
356 | } | |
357 | *nrp = *orp; | |
358 | list_add_rcu(&nrp->list, nhead); | |
359 | } | |
360 | return rc; | |
361 | } | |
362 | ||
5663884c LP |
363 | /** |
364 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
365 | * @mode - input mode in form of PTRACE_MODE_* | |
366 | * | |
367 | * Returns a converted MAY_* mode usable by smack rules | |
368 | */ | |
369 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
370 | { | |
371 | switch (mode) { | |
372 | case PTRACE_MODE_READ: | |
373 | return MAY_READ; | |
374 | case PTRACE_MODE_ATTACH: | |
375 | return MAY_READWRITE; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | /** | |
382 | * smk_ptrace_rule_check - helper for ptrace access | |
383 | * @tracer: tracer process | |
21c7eae2 | 384 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
385 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
386 | * @func: name of the function that called us, used for audit | |
387 | * | |
388 | * Returns 0 on access granted, -error on error | |
389 | */ | |
21c7eae2 LP |
390 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
391 | struct smack_known *tracee_known, | |
5663884c LP |
392 | unsigned int mode, const char *func) |
393 | { | |
394 | int rc; | |
395 | struct smk_audit_info ad, *saip = NULL; | |
396 | struct task_smack *tsp; | |
21c7eae2 | 397 | struct smack_known *tracer_known; |
5663884c LP |
398 | |
399 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
400 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
401 | smk_ad_setfield_u_tsk(&ad, tracer); | |
402 | saip = &ad; | |
403 | } | |
404 | ||
6d1cff2a AR |
405 | rcu_read_lock(); |
406 | tsp = __task_cred(tracer)->security; | |
21c7eae2 | 407 | tracer_known = smk_of_task(tsp); |
5663884c | 408 | |
66867818 LP |
409 | if ((mode & PTRACE_MODE_ATTACH) && |
410 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
411 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 412 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
413 | rc = 0; |
414 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
415 | rc = -EACCES; | |
416 | else if (capable(CAP_SYS_PTRACE)) | |
417 | rc = 0; | |
418 | else | |
419 | rc = -EACCES; | |
420 | ||
421 | if (saip) | |
21c7eae2 LP |
422 | smack_log(tracer_known->smk_known, |
423 | tracee_known->smk_known, | |
424 | 0, rc, saip); | |
66867818 | 425 | |
6d1cff2a | 426 | rcu_read_unlock(); |
66867818 LP |
427 | return rc; |
428 | } | |
429 | ||
430 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 431 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
432 | |
433 | rcu_read_unlock(); | |
5663884c LP |
434 | return rc; |
435 | } | |
436 | ||
e114e473 CS |
437 | /* |
438 | * LSM hooks. | |
439 | * We he, that is fun! | |
440 | */ | |
441 | ||
442 | /** | |
9e48858f | 443 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 444 | * @ctp: child task pointer |
5663884c | 445 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
446 | * |
447 | * Returns 0 if access is OK, an error code otherwise | |
448 | * | |
5663884c | 449 | * Do the capability checks. |
e114e473 | 450 | */ |
9e48858f | 451 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 452 | { |
2f823ff8 | 453 | struct smack_known *skp; |
e114e473 | 454 | |
6d1cff2a | 455 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 456 | |
b1d9e6b0 | 457 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
458 | } |
459 | ||
460 | /** | |
461 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
462 | * @ptp: parent task pointer | |
463 | * | |
464 | * Returns 0 if access is OK, an error code otherwise | |
465 | * | |
5663884c | 466 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
467 | */ |
468 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
469 | { | |
470 | int rc; | |
2f823ff8 | 471 | struct smack_known *skp; |
5cd9c58f | 472 | |
959e6c7f | 473 | skp = smk_of_task(current_security()); |
ecfcc53f | 474 | |
21c7eae2 | 475 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
476 | return rc; |
477 | } | |
478 | ||
479 | /** | |
480 | * smack_syslog - Smack approval on syslog | |
481 | * @type: message type | |
482 | * | |
e114e473 CS |
483 | * Returns 0 on success, error code otherwise. |
484 | */ | |
12b3052c | 485 | static int smack_syslog(int typefrom_file) |
e114e473 | 486 | { |
12b3052c | 487 | int rc = 0; |
2f823ff8 | 488 | struct smack_known *skp = smk_of_current(); |
e114e473 | 489 | |
1880eff7 | 490 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
491 | return 0; |
492 | ||
24ea1b6e | 493 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
494 | rc = -EACCES; |
495 | ||
496 | return rc; | |
497 | } | |
498 | ||
499 | ||
500 | /* | |
501 | * Superblock Hooks. | |
502 | */ | |
503 | ||
504 | /** | |
505 | * smack_sb_alloc_security - allocate a superblock blob | |
506 | * @sb: the superblock getting the blob | |
507 | * | |
508 | * Returns 0 on success or -ENOMEM on error. | |
509 | */ | |
510 | static int smack_sb_alloc_security(struct super_block *sb) | |
511 | { | |
512 | struct superblock_smack *sbsp; | |
513 | ||
514 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
515 | ||
516 | if (sbsp == NULL) | |
517 | return -ENOMEM; | |
518 | ||
21c7eae2 LP |
519 | sbsp->smk_root = &smack_known_floor; |
520 | sbsp->smk_default = &smack_known_floor; | |
521 | sbsp->smk_floor = &smack_known_floor; | |
522 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 CS |
523 | /* |
524 | * smk_initialized will be zero from kzalloc. | |
525 | */ | |
e114e473 CS |
526 | sb->s_security = sbsp; |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /** | |
532 | * smack_sb_free_security - free a superblock blob | |
533 | * @sb: the superblock getting the blob | |
534 | * | |
535 | */ | |
536 | static void smack_sb_free_security(struct super_block *sb) | |
537 | { | |
538 | kfree(sb->s_security); | |
539 | sb->s_security = NULL; | |
540 | } | |
541 | ||
542 | /** | |
543 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 544 | * @orig: where to start |
251a2a95 | 545 | * @smackopts: mount options string |
e114e473 CS |
546 | * |
547 | * Returns 0 on success or -ENOMEM on error. | |
548 | * | |
549 | * Copy the Smack specific mount options out of the mount | |
550 | * options list. | |
551 | */ | |
e0007529 | 552 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
553 | { |
554 | char *cp, *commap, *otheropts, *dp; | |
555 | ||
e114e473 CS |
556 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
557 | if (otheropts == NULL) | |
558 | return -ENOMEM; | |
559 | ||
560 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
561 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
562 | dp = smackopts; | |
563 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
564 | dp = smackopts; | |
565 | else if (strstr(cp, SMK_FSHAT) == cp) | |
566 | dp = smackopts; | |
567 | else if (strstr(cp, SMK_FSROOT) == cp) | |
568 | dp = smackopts; | |
e830b394 CS |
569 | else if (strstr(cp, SMK_FSTRANS) == cp) |
570 | dp = smackopts; | |
e114e473 CS |
571 | else |
572 | dp = otheropts; | |
573 | ||
574 | commap = strchr(cp, ','); | |
575 | if (commap != NULL) | |
576 | *commap = '\0'; | |
577 | ||
578 | if (*dp != '\0') | |
579 | strcat(dp, ","); | |
580 | strcat(dp, cp); | |
581 | } | |
582 | ||
583 | strcpy(orig, otheropts); | |
584 | free_page((unsigned long)otheropts); | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | /** | |
3bf2789c VT |
590 | * smack_parse_opts_str - parse Smack specific mount options |
591 | * @options: mount options string | |
592 | * @opts: where to store converted mount opts | |
593 | * | |
594 | * Returns 0 on success or -ENOMEM on error. | |
595 | * | |
596 | * converts Smack specific mount options to generic security option format | |
597 | */ | |
598 | static int smack_parse_opts_str(char *options, | |
599 | struct security_mnt_opts *opts) | |
600 | { | |
601 | char *p; | |
602 | char *fsdefault = NULL, *fsfloor = NULL; | |
603 | char *fshat = NULL, *fsroot = NULL, *fstransmute = NULL; | |
604 | int rc = -ENOMEM, num_mnt_opts = 0; | |
605 | ||
606 | opts->num_mnt_opts = 0; | |
607 | ||
608 | if (!options) | |
609 | return 0; | |
610 | ||
611 | while ((p = strsep(&options, ",")) != NULL) { | |
612 | int token; | |
613 | substring_t args[MAX_OPT_ARGS]; | |
614 | ||
615 | if (!*p) | |
616 | continue; | |
617 | ||
618 | token = match_token(p, tokens, args); | |
619 | ||
620 | switch (token) { | |
621 | case Opt_fsdefault: | |
622 | if (fsdefault) | |
623 | goto out_opt_err; | |
624 | fsdefault = match_strdup(&args[0]); | |
625 | if (!fsdefault) | |
626 | goto out_err; | |
627 | break; | |
628 | case Opt_fsfloor: | |
629 | if (fsfloor) | |
630 | goto out_opt_err; | |
631 | fsfloor = match_strdup(&args[0]); | |
632 | if (!fsfloor) | |
633 | goto out_err; | |
634 | break; | |
635 | case Opt_fshat: | |
636 | if (fshat) | |
637 | goto out_opt_err; | |
638 | fshat = match_strdup(&args[0]); | |
639 | if (!fshat) | |
640 | goto out_err; | |
641 | break; | |
642 | case Opt_fsroot: | |
643 | if (fsroot) | |
644 | goto out_opt_err; | |
645 | fsroot = match_strdup(&args[0]); | |
646 | if (!fsroot) | |
647 | goto out_err; | |
648 | break; | |
649 | case Opt_fstransmute: | |
650 | if (fstransmute) | |
651 | goto out_opt_err; | |
652 | fstransmute = match_strdup(&args[0]); | |
653 | if (!fstransmute) | |
654 | goto out_err; | |
655 | break; | |
656 | default: | |
657 | rc = -EINVAL; | |
658 | pr_warn("Smack: unknown mount option\n"); | |
659 | goto out_err; | |
660 | } | |
661 | } | |
662 | ||
663 | opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
664 | if (!opts->mnt_opts) | |
665 | goto out_err; | |
666 | ||
667 | opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int), | |
668 | GFP_ATOMIC); | |
669 | if (!opts->mnt_opts_flags) { | |
670 | kfree(opts->mnt_opts); | |
671 | goto out_err; | |
672 | } | |
673 | ||
674 | if (fsdefault) { | |
675 | opts->mnt_opts[num_mnt_opts] = fsdefault; | |
676 | opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT; | |
677 | } | |
678 | if (fsfloor) { | |
679 | opts->mnt_opts[num_mnt_opts] = fsfloor; | |
680 | opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT; | |
681 | } | |
682 | if (fshat) { | |
683 | opts->mnt_opts[num_mnt_opts] = fshat; | |
684 | opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT; | |
685 | } | |
686 | if (fsroot) { | |
687 | opts->mnt_opts[num_mnt_opts] = fsroot; | |
688 | opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT; | |
689 | } | |
690 | if (fstransmute) { | |
691 | opts->mnt_opts[num_mnt_opts] = fstransmute; | |
692 | opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT; | |
693 | } | |
694 | ||
695 | opts->num_mnt_opts = num_mnt_opts; | |
696 | return 0; | |
697 | ||
698 | out_opt_err: | |
699 | rc = -EINVAL; | |
700 | pr_warn("Smack: duplicate mount options\n"); | |
701 | ||
702 | out_err: | |
703 | kfree(fsdefault); | |
704 | kfree(fsfloor); | |
705 | kfree(fshat); | |
706 | kfree(fsroot); | |
707 | kfree(fstransmute); | |
708 | return rc; | |
709 | } | |
710 | ||
711 | /** | |
712 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 713 | * @sb: the file system superblock |
3bf2789c VT |
714 | * @opts: Smack mount options |
715 | * @kern_flags: mount option from kernel space or user space | |
716 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
717 | * |
718 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
719 | * |
720 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
721 | * labels. | |
e114e473 | 722 | */ |
3bf2789c VT |
723 | static int smack_set_mnt_opts(struct super_block *sb, |
724 | struct security_mnt_opts *opts, | |
725 | unsigned long kern_flags, | |
726 | unsigned long *set_kern_flags) | |
e114e473 CS |
727 | { |
728 | struct dentry *root = sb->s_root; | |
c6f493d6 | 729 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
730 | struct superblock_smack *sp = sb->s_security; |
731 | struct inode_smack *isp; | |
24ea1b6e | 732 | struct smack_known *skp; |
3bf2789c VT |
733 | int i; |
734 | int num_opts = opts->num_mnt_opts; | |
e830b394 | 735 | int transmute = 0; |
e114e473 | 736 | |
e830b394 | 737 | if (sp->smk_initialized) |
e114e473 | 738 | return 0; |
eb982cb4 | 739 | |
e114e473 | 740 | sp->smk_initialized = 1; |
e114e473 | 741 | |
3bf2789c VT |
742 | for (i = 0; i < num_opts; i++) { |
743 | switch (opts->mnt_opts_flags[i]) { | |
744 | case FSDEFAULT_MNT: | |
745 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
746 | if (IS_ERR(skp)) |
747 | return PTR_ERR(skp); | |
3bf2789c VT |
748 | sp->smk_default = skp; |
749 | break; | |
750 | case FSFLOOR_MNT: | |
751 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
752 | if (IS_ERR(skp)) |
753 | return PTR_ERR(skp); | |
754 | sp->smk_floor = skp; | |
3bf2789c VT |
755 | break; |
756 | case FSHAT_MNT: | |
757 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
758 | if (IS_ERR(skp)) |
759 | return PTR_ERR(skp); | |
3bf2789c VT |
760 | sp->smk_hat = skp; |
761 | break; | |
762 | case FSROOT_MNT: | |
763 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
764 | if (IS_ERR(skp)) |
765 | return PTR_ERR(skp); | |
766 | sp->smk_root = skp; | |
3bf2789c VT |
767 | break; |
768 | case FSTRANS_MNT: | |
769 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
770 | if (IS_ERR(skp)) |
771 | return PTR_ERR(skp); | |
772 | sp->smk_root = skp; | |
773 | transmute = 1; | |
3bf2789c VT |
774 | break; |
775 | default: | |
776 | break; | |
e114e473 CS |
777 | } |
778 | } | |
779 | ||
24ea1b6e CS |
780 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
781 | /* | |
782 | * Unprivileged mounts don't get to specify Smack values. | |
783 | */ | |
3bf2789c | 784 | if (num_opts) |
24ea1b6e CS |
785 | return -EPERM; |
786 | /* | |
787 | * Unprivileged mounts get root and default from the caller. | |
788 | */ | |
789 | skp = smk_of_current(); | |
21c7eae2 LP |
790 | sp->smk_root = skp; |
791 | sp->smk_default = skp; | |
24ea1b6e | 792 | } |
3bf2789c | 793 | |
e114e473 CS |
794 | /* |
795 | * Initialize the root inode. | |
796 | */ | |
797 | isp = inode->i_security; | |
55dfc5da JB |
798 | if (isp == NULL) { |
799 | isp = new_inode_smack(sp->smk_root); | |
800 | if (isp == NULL) | |
801 | return -ENOMEM; | |
802 | inode->i_security = isp; | |
e830b394 | 803 | } else |
e114e473 CS |
804 | isp->smk_inode = sp->smk_root; |
805 | ||
e830b394 CS |
806 | if (transmute) |
807 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
808 | ||
e114e473 CS |
809 | return 0; |
810 | } | |
811 | ||
3bf2789c VT |
812 | /** |
813 | * smack_sb_kern_mount - Smack specific mount processing | |
814 | * @sb: the file system superblock | |
815 | * @flags: the mount flags | |
816 | * @data: the smack mount options | |
817 | * | |
818 | * Returns 0 on success, an error code on failure | |
819 | */ | |
820 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) | |
821 | { | |
822 | int rc = 0; | |
823 | char *options = data; | |
824 | struct security_mnt_opts opts; | |
825 | ||
826 | security_init_mnt_opts(&opts); | |
827 | ||
828 | if (!options) | |
829 | goto out; | |
830 | ||
831 | rc = smack_parse_opts_str(options, &opts); | |
832 | if (rc) | |
833 | goto out_err; | |
834 | ||
835 | out: | |
836 | rc = smack_set_mnt_opts(sb, &opts, 0, NULL); | |
837 | ||
838 | out_err: | |
839 | security_free_mnt_opts(&opts); | |
840 | return rc; | |
841 | } | |
842 | ||
e114e473 CS |
843 | /** |
844 | * smack_sb_statfs - Smack check on statfs | |
845 | * @dentry: identifies the file system in question | |
846 | * | |
847 | * Returns 0 if current can read the floor of the filesystem, | |
848 | * and error code otherwise | |
849 | */ | |
850 | static int smack_sb_statfs(struct dentry *dentry) | |
851 | { | |
852 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
853 | int rc; |
854 | struct smk_audit_info ad; | |
855 | ||
a269434d | 856 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 857 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 858 | |
ecfcc53f | 859 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 860 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 861 | return rc; |
e114e473 CS |
862 | } |
863 | ||
676dac4b CS |
864 | /* |
865 | * BPRM hooks | |
866 | */ | |
867 | ||
ce8a4321 CS |
868 | /** |
869 | * smack_bprm_set_creds - set creds for exec | |
870 | * @bprm: the exec information | |
871 | * | |
5663884c | 872 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 873 | */ |
676dac4b CS |
874 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
875 | { | |
496ad9aa | 876 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 877 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 878 | struct inode_smack *isp; |
676dac4b CS |
879 | int rc; |
880 | ||
676dac4b CS |
881 | if (bprm->cred_prepared) |
882 | return 0; | |
883 | ||
84088ba2 JS |
884 | isp = inode->i_security; |
885 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
886 | return 0; |
887 | ||
5663884c LP |
888 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
889 | struct task_struct *tracer; | |
890 | rc = 0; | |
891 | ||
892 | rcu_read_lock(); | |
893 | tracer = ptrace_parent(current); | |
894 | if (likely(tracer != NULL)) | |
895 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 896 | isp->smk_task, |
5663884c LP |
897 | PTRACE_MODE_ATTACH, |
898 | __func__); | |
899 | rcu_read_unlock(); | |
900 | ||
901 | if (rc != 0) | |
902 | return rc; | |
903 | } else if (bprm->unsafe) | |
84088ba2 | 904 | return -EPERM; |
676dac4b | 905 | |
84088ba2 JS |
906 | bsp->smk_task = isp->smk_task; |
907 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 908 | |
84088ba2 JS |
909 | return 0; |
910 | } | |
676dac4b | 911 | |
84088ba2 JS |
912 | /** |
913 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
914 | * from bprm. | |
915 | * | |
916 | * @bprm: binprm for exec | |
917 | */ | |
918 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
919 | { | |
920 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 921 | |
84088ba2 JS |
922 | if (bsp->smk_task != bsp->smk_forked) |
923 | current->pdeath_signal = 0; | |
924 | } | |
925 | ||
926 | /** | |
927 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
928 | * @bprm: binprm for exec | |
929 | * | |
930 | * Returns 0 on success. | |
931 | */ | |
932 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
933 | { | |
934 | struct task_smack *tsp = current_security(); | |
84088ba2 | 935 | |
b1d9e6b0 CS |
936 | if (tsp->smk_task != tsp->smk_forked) |
937 | return 1; | |
84088ba2 | 938 | |
b1d9e6b0 | 939 | return 0; |
676dac4b CS |
940 | } |
941 | ||
e114e473 CS |
942 | /* |
943 | * Inode hooks | |
944 | */ | |
945 | ||
946 | /** | |
947 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 948 | * @inode: the inode in need of a blob |
e114e473 CS |
949 | * |
950 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
951 | */ | |
952 | static int smack_inode_alloc_security(struct inode *inode) | |
953 | { | |
2f823ff8 CS |
954 | struct smack_known *skp = smk_of_current(); |
955 | ||
21c7eae2 | 956 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
957 | if (inode->i_security == NULL) |
958 | return -ENOMEM; | |
959 | return 0; | |
960 | } | |
961 | ||
962 | /** | |
963 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 964 | * @inode: the inode with a blob |
e114e473 CS |
965 | * |
966 | * Clears the blob pointer in inode | |
967 | */ | |
968 | static void smack_inode_free_security(struct inode *inode) | |
969 | { | |
1a5b472b | 970 | kmem_cache_free(smack_inode_cache, inode->i_security); |
e114e473 CS |
971 | inode->i_security = NULL; |
972 | } | |
973 | ||
974 | /** | |
975 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
976 | * @inode: the newly created inode |
977 | * @dir: containing directory object | |
2a7dba39 | 978 | * @qstr: unused |
e114e473 CS |
979 | * @name: where to put the attribute name |
980 | * @value: where to put the attribute value | |
981 | * @len: where to put the length of the attribute | |
982 | * | |
983 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
984 | */ | |
985 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 986 | const struct qstr *qstr, const char **name, |
2a7dba39 | 987 | void **value, size_t *len) |
e114e473 | 988 | { |
2267b13a | 989 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 990 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
991 | struct smack_known *isp = smk_of_inode(inode); |
992 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 993 | int may; |
e114e473 | 994 | |
9548906b TH |
995 | if (name) |
996 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 997 | |
68390ccf | 998 | if (value && len) { |
7898e1f8 | 999 | rcu_read_lock(); |
21c7eae2 LP |
1000 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1001 | &skp->smk_rules); | |
7898e1f8 | 1002 | rcu_read_unlock(); |
5c6d1125 JS |
1003 | |
1004 | /* | |
1005 | * If the access rule allows transmutation and | |
1006 | * the directory requests transmutation then | |
1007 | * by all means transmute. | |
2267b13a | 1008 | * Mark the inode as changed. |
5c6d1125 | 1009 | */ |
7898e1f8 | 1010 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1011 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1012 | isp = dsp; |
2267b13a CS |
1013 | issp->smk_flags |= SMK_INODE_CHANGED; |
1014 | } | |
5c6d1125 | 1015 | |
21c7eae2 | 1016 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1017 | if (*value == NULL) |
1018 | return -ENOMEM; | |
e114e473 | 1019 | |
21c7eae2 | 1020 | *len = strlen(isp->smk_known); |
68390ccf | 1021 | } |
e114e473 CS |
1022 | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | /** | |
1027 | * smack_inode_link - Smack check on link | |
1028 | * @old_dentry: the existing object | |
1029 | * @dir: unused | |
1030 | * @new_dentry: the new object | |
1031 | * | |
1032 | * Returns 0 if access is permitted, an error code otherwise | |
1033 | */ | |
1034 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1035 | struct dentry *new_dentry) | |
1036 | { | |
21c7eae2 | 1037 | struct smack_known *isp; |
ecfcc53f EB |
1038 | struct smk_audit_info ad; |
1039 | int rc; | |
1040 | ||
a269434d | 1041 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1042 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1043 | |
c6f493d6 | 1044 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1045 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1046 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1047 | |
8802565b | 1048 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1049 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1050 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1051 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1052 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1053 | } |
1054 | ||
1055 | return rc; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * smack_inode_unlink - Smack check on inode deletion | |
1060 | * @dir: containing directory object | |
1061 | * @dentry: file to unlink | |
1062 | * | |
1063 | * Returns 0 if current can write the containing directory | |
1064 | * and the object, error code otherwise | |
1065 | */ | |
1066 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1067 | { | |
c6f493d6 | 1068 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1069 | struct smk_audit_info ad; |
e114e473 CS |
1070 | int rc; |
1071 | ||
a269434d | 1072 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1073 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1074 | ||
e114e473 CS |
1075 | /* |
1076 | * You need write access to the thing you're unlinking | |
1077 | */ | |
ecfcc53f | 1078 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1079 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1080 | if (rc == 0) { |
e114e473 CS |
1081 | /* |
1082 | * You also need write access to the containing directory | |
1083 | */ | |
cdb56b60 | 1084 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1085 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1086 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1087 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1088 | } |
e114e473 CS |
1089 | return rc; |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * smack_inode_rmdir - Smack check on directory deletion | |
1094 | * @dir: containing directory object | |
1095 | * @dentry: directory to unlink | |
1096 | * | |
1097 | * Returns 0 if current can write the containing directory | |
1098 | * and the directory, error code otherwise | |
1099 | */ | |
1100 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1101 | { | |
ecfcc53f | 1102 | struct smk_audit_info ad; |
e114e473 CS |
1103 | int rc; |
1104 | ||
a269434d | 1105 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1106 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1107 | ||
e114e473 CS |
1108 | /* |
1109 | * You need write access to the thing you're removing | |
1110 | */ | |
c6f493d6 DH |
1111 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1112 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1113 | if (rc == 0) { |
e114e473 CS |
1114 | /* |
1115 | * You also need write access to the containing directory | |
1116 | */ | |
cdb56b60 | 1117 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1118 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1119 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1120 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1121 | } |
e114e473 CS |
1122 | |
1123 | return rc; | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1128 | * @old_inode: unused |
1129 | * @old_dentry: the old object | |
1130 | * @new_inode: unused | |
1131 | * @new_dentry: the new object | |
e114e473 CS |
1132 | * |
1133 | * Read and write access is required on both the old and | |
1134 | * new directories. | |
1135 | * | |
1136 | * Returns 0 if access is permitted, an error code otherwise | |
1137 | */ | |
1138 | static int smack_inode_rename(struct inode *old_inode, | |
1139 | struct dentry *old_dentry, | |
1140 | struct inode *new_inode, | |
1141 | struct dentry *new_dentry) | |
1142 | { | |
1143 | int rc; | |
21c7eae2 | 1144 | struct smack_known *isp; |
ecfcc53f EB |
1145 | struct smk_audit_info ad; |
1146 | ||
a269434d | 1147 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1148 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1149 | |
c6f493d6 | 1150 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1151 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1152 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1153 | |
8802565b | 1154 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1155 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1156 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1157 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1158 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1159 | } |
e114e473 CS |
1160 | return rc; |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * smack_inode_permission - Smack version of permission() | |
1165 | * @inode: the inode in question | |
1166 | * @mask: the access requested | |
e114e473 CS |
1167 | * |
1168 | * This is the important Smack hook. | |
1169 | * | |
1170 | * Returns 0 if access is permitted, -EACCES otherwise | |
1171 | */ | |
e74f71eb | 1172 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1173 | { |
ecfcc53f | 1174 | struct smk_audit_info ad; |
e74f71eb | 1175 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1176 | int rc; |
d09ca739 EP |
1177 | |
1178 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1179 | /* |
1180 | * No permission to check. Existence test. Yup, it's there. | |
1181 | */ | |
1182 | if (mask == 0) | |
1183 | return 0; | |
8c9e80ed AK |
1184 | |
1185 | /* May be droppable after audit */ | |
e74f71eb | 1186 | if (no_block) |
8c9e80ed | 1187 | return -ECHILD; |
f48b7399 | 1188 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1189 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1190 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1191 | rc = smk_bu_inode(inode, mask, rc); | |
1192 | return rc; | |
e114e473 CS |
1193 | } |
1194 | ||
1195 | /** | |
1196 | * smack_inode_setattr - Smack check for setting attributes | |
1197 | * @dentry: the object | |
1198 | * @iattr: for the force flag | |
1199 | * | |
1200 | * Returns 0 if access is permitted, an error code otherwise | |
1201 | */ | |
1202 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1203 | { | |
ecfcc53f | 1204 | struct smk_audit_info ad; |
d166c802 CS |
1205 | int rc; |
1206 | ||
e114e473 CS |
1207 | /* |
1208 | * Need to allow for clearing the setuid bit. | |
1209 | */ | |
1210 | if (iattr->ia_valid & ATTR_FORCE) | |
1211 | return 0; | |
a269434d | 1212 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1213 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1214 | |
c6f493d6 DH |
1215 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1216 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1217 | return rc; |
e114e473 CS |
1218 | } |
1219 | ||
1220 | /** | |
1221 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1222 | * @mnt: vfsmount of the object |
e114e473 CS |
1223 | * @dentry: the object |
1224 | * | |
1225 | * Returns 0 if access is permitted, an error code otherwise | |
1226 | */ | |
3f7036a0 | 1227 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1228 | { |
ecfcc53f | 1229 | struct smk_audit_info ad; |
c6f493d6 | 1230 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1231 | int rc; |
ecfcc53f | 1232 | |
f48b7399 | 1233 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1234 | smk_ad_setfield_u_fs_path(&ad, *path); |
1235 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1236 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1237 | return rc; |
e114e473 CS |
1238 | } |
1239 | ||
1240 | /** | |
1241 | * smack_inode_setxattr - Smack check for setting xattrs | |
1242 | * @dentry: the object | |
1243 | * @name: name of the attribute | |
e95ef49b LP |
1244 | * @value: value of the attribute |
1245 | * @size: size of the value | |
e114e473 CS |
1246 | * @flags: unused |
1247 | * | |
1248 | * This protects the Smack attribute explicitly. | |
1249 | * | |
1250 | * Returns 0 if access is permitted, an error code otherwise | |
1251 | */ | |
8f0cfa52 DH |
1252 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1253 | const void *value, size_t size, int flags) | |
e114e473 | 1254 | { |
ecfcc53f | 1255 | struct smk_audit_info ad; |
19760ad0 CS |
1256 | struct smack_known *skp; |
1257 | int check_priv = 0; | |
1258 | int check_import = 0; | |
1259 | int check_star = 0; | |
bcdca225 | 1260 | int rc = 0; |
e114e473 | 1261 | |
19760ad0 CS |
1262 | /* |
1263 | * Check label validity here so import won't fail in post_setxattr | |
1264 | */ | |
bcdca225 CS |
1265 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1266 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1267 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1268 | check_priv = 1; | |
1269 | check_import = 1; | |
1270 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1271 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1272 | check_priv = 1; | |
1273 | check_import = 1; | |
1274 | check_star = 1; | |
5c6d1125 | 1275 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1276 | check_priv = 1; |
5c6d1125 JS |
1277 | if (size != TRANS_TRUE_SIZE || |
1278 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1279 | rc = -EINVAL; | |
bcdca225 CS |
1280 | } else |
1281 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1282 | ||
19760ad0 CS |
1283 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1284 | rc = -EPERM; | |
1285 | ||
1286 | if (rc == 0 && check_import) { | |
b862e561 | 1287 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1288 | if (IS_ERR(skp)) |
1289 | rc = PTR_ERR(skp); | |
1290 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1291 | (skp == &smack_known_star || skp == &smack_known_web))) |
1292 | rc = -EINVAL; | |
1293 | } | |
1294 | ||
a269434d | 1295 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1296 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1297 | ||
d166c802 | 1298 | if (rc == 0) { |
c6f493d6 DH |
1299 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1300 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1301 | } |
bcdca225 CS |
1302 | |
1303 | return rc; | |
e114e473 CS |
1304 | } |
1305 | ||
1306 | /** | |
1307 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1308 | * @dentry: object | |
1309 | * @name: attribute name | |
1310 | * @value: attribute value | |
1311 | * @size: attribute size | |
1312 | * @flags: unused | |
1313 | * | |
1314 | * Set the pointer in the inode blob to the entry found | |
1315 | * in the master label list. | |
1316 | */ | |
8f0cfa52 DH |
1317 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1318 | const void *value, size_t size, int flags) | |
e114e473 | 1319 | { |
2f823ff8 | 1320 | struct smack_known *skp; |
c6f493d6 | 1321 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1322 | |
2f823ff8 CS |
1323 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1324 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1325 | return; | |
1326 | } | |
1327 | ||
676dac4b | 1328 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1329 | skp = smk_import_entry(value, size); |
e774ad68 | 1330 | if (!IS_ERR(skp)) |
21c7eae2 | 1331 | isp->smk_inode = skp; |
676dac4b | 1332 | else |
21c7eae2 | 1333 | isp->smk_inode = &smack_known_invalid; |
5c6d1125 | 1334 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1335 | skp = smk_import_entry(value, size); |
e774ad68 | 1336 | if (!IS_ERR(skp)) |
2f823ff8 | 1337 | isp->smk_task = skp; |
676dac4b | 1338 | else |
2f823ff8 | 1339 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 1340 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1341 | skp = smk_import_entry(value, size); |
e774ad68 | 1342 | if (!IS_ERR(skp)) |
2f823ff8 | 1343 | isp->smk_mmap = skp; |
7898e1f8 | 1344 | else |
2f823ff8 CS |
1345 | isp->smk_mmap = &smack_known_invalid; |
1346 | } | |
e114e473 CS |
1347 | |
1348 | return; | |
1349 | } | |
1350 | ||
ce8a4321 | 1351 | /** |
e114e473 CS |
1352 | * smack_inode_getxattr - Smack check on getxattr |
1353 | * @dentry: the object | |
1354 | * @name: unused | |
1355 | * | |
1356 | * Returns 0 if access is permitted, an error code otherwise | |
1357 | */ | |
8f0cfa52 | 1358 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1359 | { |
ecfcc53f | 1360 | struct smk_audit_info ad; |
d166c802 | 1361 | int rc; |
ecfcc53f | 1362 | |
a269434d | 1363 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1364 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1365 | ||
c6f493d6 DH |
1366 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1367 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1368 | return rc; |
e114e473 CS |
1369 | } |
1370 | ||
ce8a4321 | 1371 | /** |
e114e473 CS |
1372 | * smack_inode_removexattr - Smack check on removexattr |
1373 | * @dentry: the object | |
1374 | * @name: name of the attribute | |
1375 | * | |
1376 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1377 | * | |
1378 | * Returns 0 if access is permitted, an error code otherwise | |
1379 | */ | |
8f0cfa52 | 1380 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1381 | { |
676dac4b | 1382 | struct inode_smack *isp; |
ecfcc53f | 1383 | struct smk_audit_info ad; |
bcdca225 | 1384 | int rc = 0; |
e114e473 | 1385 | |
bcdca225 CS |
1386 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1387 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1388 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1389 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1390 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1391 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1392 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1393 | rc = -EPERM; |
1394 | } else | |
1395 | rc = cap_inode_removexattr(dentry, name); | |
1396 | ||
f59bdfba CS |
1397 | if (rc != 0) |
1398 | return rc; | |
1399 | ||
a269434d | 1400 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1401 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1402 | |
c6f493d6 DH |
1403 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1404 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1405 | if (rc != 0) |
1406 | return rc; | |
1407 | ||
c6f493d6 | 1408 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1409 | /* |
1410 | * Don't do anything special for these. | |
1411 | * XATTR_NAME_SMACKIPIN | |
1412 | * XATTR_NAME_SMACKIPOUT | |
1413 | * XATTR_NAME_SMACKEXEC | |
1414 | */ | |
1415 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
676dac4b | 1416 | isp->smk_task = NULL; |
f59bdfba | 1417 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1418 | isp->smk_mmap = NULL; |
f59bdfba CS |
1419 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1420 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1421 | |
f59bdfba | 1422 | return 0; |
e114e473 CS |
1423 | } |
1424 | ||
1425 | /** | |
1426 | * smack_inode_getsecurity - get smack xattrs | |
1427 | * @inode: the object | |
1428 | * @name: attribute name | |
1429 | * @buffer: where to put the result | |
251a2a95 | 1430 | * @alloc: unused |
e114e473 CS |
1431 | * |
1432 | * Returns the size of the attribute or an error code | |
1433 | */ | |
1434 | static int smack_inode_getsecurity(const struct inode *inode, | |
1435 | const char *name, void **buffer, | |
1436 | bool alloc) | |
1437 | { | |
1438 | struct socket_smack *ssp; | |
1439 | struct socket *sock; | |
1440 | struct super_block *sbp; | |
1441 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1442 | struct smack_known *isp; |
e114e473 CS |
1443 | int ilen; |
1444 | int rc = 0; | |
1445 | ||
1446 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1447 | isp = smk_of_inode(inode); | |
21c7eae2 LP |
1448 | ilen = strlen(isp->smk_known); |
1449 | *buffer = isp->smk_known; | |
e114e473 CS |
1450 | return ilen; |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * The rest of the Smack xattrs are only on sockets. | |
1455 | */ | |
1456 | sbp = ip->i_sb; | |
1457 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1458 | return -EOPNOTSUPP; | |
1459 | ||
1460 | sock = SOCKET_I(ip); | |
2e1d146a | 1461 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1462 | return -EOPNOTSUPP; |
1463 | ||
1464 | ssp = sock->sk->sk_security; | |
1465 | ||
1466 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
21c7eae2 | 1467 | isp = ssp->smk_in; |
e114e473 | 1468 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
21c7eae2 | 1469 | isp = ssp->smk_out; |
e114e473 CS |
1470 | else |
1471 | return -EOPNOTSUPP; | |
1472 | ||
21c7eae2 | 1473 | ilen = strlen(isp->smk_known); |
e114e473 | 1474 | if (rc == 0) { |
21c7eae2 | 1475 | *buffer = isp->smk_known; |
e114e473 CS |
1476 | rc = ilen; |
1477 | } | |
1478 | ||
1479 | return rc; | |
1480 | } | |
1481 | ||
1482 | ||
1483 | /** | |
1484 | * smack_inode_listsecurity - list the Smack attributes | |
1485 | * @inode: the object | |
1486 | * @buffer: where they go | |
1487 | * @buffer_size: size of buffer | |
1488 | * | |
1489 | * Returns 0 on success, -EINVAL otherwise | |
1490 | */ | |
1491 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1492 | size_t buffer_size) | |
1493 | { | |
fd5c9d23 | 1494 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1495 | |
fd5c9d23 | 1496 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1497 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1498 | |
1499 | return len; | |
e114e473 CS |
1500 | } |
1501 | ||
d20bdda6 AD |
1502 | /** |
1503 | * smack_inode_getsecid - Extract inode's security id | |
1504 | * @inode: inode to extract the info from | |
1505 | * @secid: where result will be saved | |
1506 | */ | |
1507 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1508 | { | |
1509 | struct inode_smack *isp = inode->i_security; | |
1510 | ||
21c7eae2 | 1511 | *secid = isp->smk_inode->smk_secid; |
d20bdda6 AD |
1512 | } |
1513 | ||
e114e473 CS |
1514 | /* |
1515 | * File Hooks | |
1516 | */ | |
1517 | ||
1518 | /** | |
1519 | * smack_file_permission - Smack check on file operations | |
1520 | * @file: unused | |
1521 | * @mask: unused | |
1522 | * | |
1523 | * Returns 0 | |
1524 | * | |
1525 | * Should access checks be done on each read or write? | |
1526 | * UNICOS and SELinux say yes. | |
1527 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1528 | * | |
1529 | * I'll say no for now. Smack does not do the frequent | |
1530 | * label changing that SELinux does. | |
1531 | */ | |
1532 | static int smack_file_permission(struct file *file, int mask) | |
1533 | { | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | /** | |
1538 | * smack_file_alloc_security - assign a file security blob | |
1539 | * @file: the object | |
1540 | * | |
1541 | * The security blob for a file is a pointer to the master | |
1542 | * label list, so no allocation is done. | |
1543 | * | |
5e7270a6 CS |
1544 | * f_security is the owner security information. It |
1545 | * isn't used on file access checks, it's for send_sigio. | |
1546 | * | |
e114e473 CS |
1547 | * Returns 0 |
1548 | */ | |
1549 | static int smack_file_alloc_security(struct file *file) | |
1550 | { | |
2f823ff8 CS |
1551 | struct smack_known *skp = smk_of_current(); |
1552 | ||
21c7eae2 | 1553 | file->f_security = skp; |
e114e473 CS |
1554 | return 0; |
1555 | } | |
1556 | ||
1557 | /** | |
1558 | * smack_file_free_security - clear a file security blob | |
1559 | * @file: the object | |
1560 | * | |
1561 | * The security blob for a file is a pointer to the master | |
1562 | * label list, so no memory is freed. | |
1563 | */ | |
1564 | static void smack_file_free_security(struct file *file) | |
1565 | { | |
1566 | file->f_security = NULL; | |
1567 | } | |
1568 | ||
1569 | /** | |
1570 | * smack_file_ioctl - Smack check on ioctls | |
1571 | * @file: the object | |
1572 | * @cmd: what to do | |
1573 | * @arg: unused | |
1574 | * | |
1575 | * Relies heavily on the correct use of the ioctl command conventions. | |
1576 | * | |
1577 | * Returns 0 if allowed, error code otherwise | |
1578 | */ | |
1579 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1580 | unsigned long arg) | |
1581 | { | |
1582 | int rc = 0; | |
ecfcc53f | 1583 | struct smk_audit_info ad; |
5e7270a6 | 1584 | struct inode *inode = file_inode(file); |
ecfcc53f | 1585 | |
f48b7399 | 1586 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1587 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1588 | |
d166c802 | 1589 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1590 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1591 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1592 | } | |
e114e473 | 1593 | |
d166c802 | 1594 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1595 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1596 | rc = smk_bu_file(file, MAY_READ, rc); |
1597 | } | |
e114e473 CS |
1598 | |
1599 | return rc; | |
1600 | } | |
1601 | ||
1602 | /** | |
1603 | * smack_file_lock - Smack check on file locking | |
1604 | * @file: the object | |
251a2a95 | 1605 | * @cmd: unused |
e114e473 | 1606 | * |
c0ab6e56 | 1607 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1608 | */ |
1609 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1610 | { | |
ecfcc53f | 1611 | struct smk_audit_info ad; |
d166c802 | 1612 | int rc; |
5e7270a6 | 1613 | struct inode *inode = file_inode(file); |
ecfcc53f | 1614 | |
92f42509 EP |
1615 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1616 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1617 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1618 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1619 | return rc; | |
e114e473 CS |
1620 | } |
1621 | ||
1622 | /** | |
1623 | * smack_file_fcntl - Smack check on fcntl | |
1624 | * @file: the object | |
1625 | * @cmd: what action to check | |
1626 | * @arg: unused | |
1627 | * | |
531f1d45 CS |
1628 | * Generally these operations are harmless. |
1629 | * File locking operations present an obvious mechanism | |
1630 | * for passing information, so they require write access. | |
1631 | * | |
e114e473 CS |
1632 | * Returns 0 if current has access, error code otherwise |
1633 | */ | |
1634 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1635 | unsigned long arg) | |
1636 | { | |
ecfcc53f | 1637 | struct smk_audit_info ad; |
531f1d45 | 1638 | int rc = 0; |
5e7270a6 | 1639 | struct inode *inode = file_inode(file); |
ecfcc53f | 1640 | |
e114e473 | 1641 | switch (cmd) { |
e114e473 | 1642 | case F_GETLK: |
c0ab6e56 | 1643 | break; |
e114e473 CS |
1644 | case F_SETLK: |
1645 | case F_SETLKW: | |
c0ab6e56 CS |
1646 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1647 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1648 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1649 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1650 | break; |
e114e473 CS |
1651 | case F_SETOWN: |
1652 | case F_SETSIG: | |
531f1d45 CS |
1653 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1654 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1655 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1656 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1657 | break; |
1658 | default: | |
531f1d45 | 1659 | break; |
e114e473 CS |
1660 | } |
1661 | ||
1662 | return rc; | |
1663 | } | |
1664 | ||
7898e1f8 | 1665 | /** |
e5467859 | 1666 | * smack_mmap_file : |
7898e1f8 CS |
1667 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1668 | * if mapping anonymous memory. | |
1669 | * @file contains the file structure for file to map (may be NULL). | |
1670 | * @reqprot contains the protection requested by the application. | |
1671 | * @prot contains the protection that will be applied by the kernel. | |
1672 | * @flags contains the operational flags. | |
1673 | * Return 0 if permission is granted. | |
1674 | */ | |
e5467859 | 1675 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1676 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1677 | unsigned long flags) |
7898e1f8 | 1678 | { |
272cd7a8 | 1679 | struct smack_known *skp; |
2f823ff8 | 1680 | struct smack_known *mkp; |
7898e1f8 CS |
1681 | struct smack_rule *srp; |
1682 | struct task_smack *tsp; | |
21c7eae2 | 1683 | struct smack_known *okp; |
7898e1f8 | 1684 | struct inode_smack *isp; |
0e0a070d CS |
1685 | int may; |
1686 | int mmay; | |
1687 | int tmay; | |
7898e1f8 CS |
1688 | int rc; |
1689 | ||
496ad9aa | 1690 | if (file == NULL) |
7898e1f8 CS |
1691 | return 0; |
1692 | ||
496ad9aa | 1693 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1694 | if (isp->smk_mmap == NULL) |
1695 | return 0; | |
2f823ff8 | 1696 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1697 | |
1698 | tsp = current_security(); | |
2f823ff8 | 1699 | skp = smk_of_current(); |
7898e1f8 CS |
1700 | rc = 0; |
1701 | ||
1702 | rcu_read_lock(); | |
1703 | /* | |
1704 | * For each Smack rule associated with the subject | |
1705 | * label verify that the SMACK64MMAP also has access | |
1706 | * to that rule's object label. | |
7898e1f8 | 1707 | */ |
272cd7a8 | 1708 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1709 | okp = srp->smk_object; |
7898e1f8 CS |
1710 | /* |
1711 | * Matching labels always allows access. | |
1712 | */ | |
21c7eae2 | 1713 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1714 | continue; |
0e0a070d CS |
1715 | /* |
1716 | * If there is a matching local rule take | |
1717 | * that into account as well. | |
1718 | */ | |
21c7eae2 LP |
1719 | may = smk_access_entry(srp->smk_subject->smk_known, |
1720 | okp->smk_known, | |
1721 | &tsp->smk_rules); | |
0e0a070d CS |
1722 | if (may == -ENOENT) |
1723 | may = srp->smk_access; | |
1724 | else | |
1725 | may &= srp->smk_access; | |
1726 | /* | |
1727 | * If may is zero the SMACK64MMAP subject can't | |
1728 | * possibly have less access. | |
1729 | */ | |
1730 | if (may == 0) | |
1731 | continue; | |
1732 | ||
1733 | /* | |
1734 | * Fetch the global list entry. | |
1735 | * If there isn't one a SMACK64MMAP subject | |
1736 | * can't have as much access as current. | |
1737 | */ | |
21c7eae2 LP |
1738 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1739 | &mkp->smk_rules); | |
0e0a070d CS |
1740 | if (mmay == -ENOENT) { |
1741 | rc = -EACCES; | |
1742 | break; | |
1743 | } | |
1744 | /* | |
1745 | * If there is a local entry it modifies the | |
1746 | * potential access, too. | |
1747 | */ | |
21c7eae2 LP |
1748 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1749 | &tsp->smk_rules); | |
0e0a070d CS |
1750 | if (tmay != -ENOENT) |
1751 | mmay &= tmay; | |
7898e1f8 | 1752 | |
0e0a070d CS |
1753 | /* |
1754 | * If there is any access available to current that is | |
1755 | * not available to a SMACK64MMAP subject | |
1756 | * deny access. | |
1757 | */ | |
75a25637 | 1758 | if ((may | mmay) != mmay) { |
0e0a070d | 1759 | rc = -EACCES; |
7898e1f8 | 1760 | break; |
0e0a070d | 1761 | } |
7898e1f8 CS |
1762 | } |
1763 | ||
1764 | rcu_read_unlock(); | |
1765 | ||
1766 | return rc; | |
1767 | } | |
1768 | ||
e114e473 CS |
1769 | /** |
1770 | * smack_file_set_fowner - set the file security blob value | |
1771 | * @file: object in question | |
1772 | * | |
e114e473 | 1773 | */ |
e0b93edd | 1774 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1775 | { |
5e7270a6 | 1776 | file->f_security = smk_of_current(); |
e114e473 CS |
1777 | } |
1778 | ||
1779 | /** | |
1780 | * smack_file_send_sigiotask - Smack on sigio | |
1781 | * @tsk: The target task | |
1782 | * @fown: the object the signal come from | |
1783 | * @signum: unused | |
1784 | * | |
1785 | * Allow a privileged task to get signals even if it shouldn't | |
1786 | * | |
1787 | * Returns 0 if a subject with the object's smack could | |
1788 | * write to the task, an error code otherwise. | |
1789 | */ | |
1790 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1791 | struct fown_struct *fown, int signum) | |
1792 | { | |
2f823ff8 CS |
1793 | struct smack_known *skp; |
1794 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1795 | struct file *file; |
1796 | int rc; | |
ecfcc53f | 1797 | struct smk_audit_info ad; |
e114e473 CS |
1798 | |
1799 | /* | |
1800 | * struct fown_struct is never outside the context of a struct file | |
1801 | */ | |
1802 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1803 | |
ecfcc53f | 1804 | /* we don't log here as rc can be overriden */ |
21c7eae2 LP |
1805 | skp = file->f_security; |
1806 | rc = smk_access(skp, tkp, MAY_WRITE, NULL); | |
1807 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc); | |
5cd9c58f | 1808 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1809 | rc = 0; |
1810 | ||
1811 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1812 | smk_ad_setfield_u_tsk(&ad, tsk); | |
21c7eae2 | 1813 | smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1814 | return rc; |
1815 | } | |
1816 | ||
1817 | /** | |
1818 | * smack_file_receive - Smack file receive check | |
1819 | * @file: the object | |
1820 | * | |
1821 | * Returns 0 if current has access, error code otherwise | |
1822 | */ | |
1823 | static int smack_file_receive(struct file *file) | |
1824 | { | |
d166c802 | 1825 | int rc; |
e114e473 | 1826 | int may = 0; |
ecfcc53f | 1827 | struct smk_audit_info ad; |
5e7270a6 | 1828 | struct inode *inode = file_inode(file); |
e114e473 | 1829 | |
9777582e SWK |
1830 | if (unlikely(IS_PRIVATE(inode))) |
1831 | return 0; | |
1832 | ||
4482a44f | 1833 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1834 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1835 | /* |
1836 | * This code relies on bitmasks. | |
1837 | */ | |
1838 | if (file->f_mode & FMODE_READ) | |
1839 | may = MAY_READ; | |
1840 | if (file->f_mode & FMODE_WRITE) | |
1841 | may |= MAY_WRITE; | |
1842 | ||
5e7270a6 | 1843 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1844 | rc = smk_bu_file(file, may, rc); |
1845 | return rc; | |
e114e473 CS |
1846 | } |
1847 | ||
531f1d45 | 1848 | /** |
83d49856 | 1849 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1850 | * @file: the object |
a6834c0b | 1851 | * @cred: task credential |
531f1d45 CS |
1852 | * |
1853 | * Set the security blob in the file structure. | |
a6834c0b CS |
1854 | * Allow the open only if the task has read access. There are |
1855 | * many read operations (e.g. fstat) that you can do with an | |
1856 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1857 | * |
1858 | * Returns 0 | |
1859 | */ | |
83d49856 | 1860 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1861 | { |
a6834c0b | 1862 | struct task_smack *tsp = cred->security; |
5e7270a6 | 1863 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1864 | struct smk_audit_info ad; |
1865 | int rc; | |
531f1d45 | 1866 | |
5e7270a6 | 1867 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
a6834c0b | 1868 | return 0; |
531f1d45 | 1869 | |
a6834c0b CS |
1870 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1871 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1872 | rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad); |
d166c802 | 1873 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1874 | |
1875 | return rc; | |
531f1d45 CS |
1876 | } |
1877 | ||
e114e473 CS |
1878 | /* |
1879 | * Task hooks | |
1880 | */ | |
1881 | ||
ee18d64c DH |
1882 | /** |
1883 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1884 | * @new: the new credentials | |
1885 | * @gfp: the atomicity of any memory allocations | |
1886 | * | |
1887 | * Prepare a blank set of credentials for modification. This must allocate all | |
1888 | * the memory the LSM module might require such that cred_transfer() can | |
1889 | * complete without error. | |
1890 | */ | |
1891 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1892 | { | |
7898e1f8 CS |
1893 | struct task_smack *tsp; |
1894 | ||
1895 | tsp = new_task_smack(NULL, NULL, gfp); | |
1896 | if (tsp == NULL) | |
676dac4b | 1897 | return -ENOMEM; |
7898e1f8 CS |
1898 | |
1899 | cred->security = tsp; | |
1900 | ||
ee18d64c DH |
1901 | return 0; |
1902 | } | |
1903 | ||
1904 | ||
e114e473 | 1905 | /** |
f1752eec DH |
1906 | * smack_cred_free - "free" task-level security credentials |
1907 | * @cred: the credentials in question | |
e114e473 | 1908 | * |
e114e473 | 1909 | */ |
f1752eec | 1910 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1911 | { |
7898e1f8 CS |
1912 | struct task_smack *tsp = cred->security; |
1913 | struct smack_rule *rp; | |
1914 | struct list_head *l; | |
1915 | struct list_head *n; | |
1916 | ||
1917 | if (tsp == NULL) | |
1918 | return; | |
1919 | cred->security = NULL; | |
1920 | ||
1921 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1922 | rp = list_entry(l, struct smack_rule, list); | |
1923 | list_del(&rp->list); | |
1924 | kfree(rp); | |
1925 | } | |
1926 | kfree(tsp); | |
e114e473 CS |
1927 | } |
1928 | ||
d84f4f99 DH |
1929 | /** |
1930 | * smack_cred_prepare - prepare new set of credentials for modification | |
1931 | * @new: the new credentials | |
1932 | * @old: the original credentials | |
1933 | * @gfp: the atomicity of any memory allocations | |
1934 | * | |
1935 | * Prepare a new set of credentials for modification. | |
1936 | */ | |
1937 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1938 | gfp_t gfp) | |
1939 | { | |
676dac4b CS |
1940 | struct task_smack *old_tsp = old->security; |
1941 | struct task_smack *new_tsp; | |
7898e1f8 | 1942 | int rc; |
676dac4b | 1943 | |
7898e1f8 | 1944 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1945 | if (new_tsp == NULL) |
1946 | return -ENOMEM; | |
1947 | ||
7898e1f8 CS |
1948 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1949 | if (rc != 0) | |
1950 | return rc; | |
1951 | ||
676dac4b | 1952 | new->security = new_tsp; |
d84f4f99 DH |
1953 | return 0; |
1954 | } | |
1955 | ||
ee18d64c DH |
1956 | /** |
1957 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1958 | * @new: the new credentials | |
1959 | * @old: the original credentials | |
1960 | * | |
1961 | * Fill in a set of blank credentials from another set of credentials. | |
1962 | */ | |
1963 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1964 | { | |
676dac4b CS |
1965 | struct task_smack *old_tsp = old->security; |
1966 | struct task_smack *new_tsp = new->security; | |
1967 | ||
1968 | new_tsp->smk_task = old_tsp->smk_task; | |
1969 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1970 | mutex_init(&new_tsp->smk_rules_lock); |
1971 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1972 | ||
1973 | ||
1974 | /* cbs copy rule list */ | |
ee18d64c DH |
1975 | } |
1976 | ||
3a3b7ce9 DH |
1977 | /** |
1978 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1979 | * @new: points to the set of credentials to be modified. |
1980 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1981 | * |
1982 | * Set the security data for a kernel service. | |
1983 | */ | |
1984 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1985 | { | |
676dac4b | 1986 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1987 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1988 | |
2f823ff8 | 1989 | if (skp == NULL) |
3a3b7ce9 DH |
1990 | return -EINVAL; |
1991 | ||
2f823ff8 | 1992 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1993 | return 0; |
1994 | } | |
1995 | ||
1996 | /** | |
1997 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1998 | * @new: points to the set of credentials to be modified |
1999 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2000 | * |
2001 | * Set the file creation context in a set of credentials to the same | |
2002 | * as the objective context of the specified inode | |
2003 | */ | |
2004 | static int smack_kernel_create_files_as(struct cred *new, | |
2005 | struct inode *inode) | |
2006 | { | |
2007 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2008 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2009 | |
21c7eae2 | 2010 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2011 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2012 | return 0; |
2013 | } | |
2014 | ||
ecfcc53f EB |
2015 | /** |
2016 | * smk_curacc_on_task - helper to log task related access | |
2017 | * @p: the task object | |
531f1d45 CS |
2018 | * @access: the access requested |
2019 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2020 | * |
2021 | * Return 0 if access is permitted | |
2022 | */ | |
531f1d45 CS |
2023 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2024 | const char *caller) | |
ecfcc53f EB |
2025 | { |
2026 | struct smk_audit_info ad; | |
6d1cff2a | 2027 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2028 | int rc; |
ecfcc53f | 2029 | |
531f1d45 | 2030 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2031 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2032 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2033 | rc = smk_bu_task(p, access, rc); |
2034 | return rc; | |
ecfcc53f EB |
2035 | } |
2036 | ||
e114e473 CS |
2037 | /** |
2038 | * smack_task_setpgid - Smack check on setting pgid | |
2039 | * @p: the task object | |
2040 | * @pgid: unused | |
2041 | * | |
2042 | * Return 0 if write access is permitted | |
2043 | */ | |
2044 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2045 | { | |
531f1d45 | 2046 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2047 | } |
2048 | ||
2049 | /** | |
2050 | * smack_task_getpgid - Smack access check for getpgid | |
2051 | * @p: the object task | |
2052 | * | |
2053 | * Returns 0 if current can read the object task, error code otherwise | |
2054 | */ | |
2055 | static int smack_task_getpgid(struct task_struct *p) | |
2056 | { | |
531f1d45 | 2057 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2058 | } |
2059 | ||
2060 | /** | |
2061 | * smack_task_getsid - Smack access check for getsid | |
2062 | * @p: the object task | |
2063 | * | |
2064 | * Returns 0 if current can read the object task, error code otherwise | |
2065 | */ | |
2066 | static int smack_task_getsid(struct task_struct *p) | |
2067 | { | |
531f1d45 | 2068 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2069 | } |
2070 | ||
2071 | /** | |
2072 | * smack_task_getsecid - get the secid of the task | |
2073 | * @p: the object task | |
2074 | * @secid: where to put the result | |
2075 | * | |
2076 | * Sets the secid to contain a u32 version of the smack label. | |
2077 | */ | |
2078 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2079 | { | |
6d1cff2a | 2080 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2081 | |
2082 | *secid = skp->smk_secid; | |
e114e473 CS |
2083 | } |
2084 | ||
2085 | /** | |
2086 | * smack_task_setnice - Smack check on setting nice | |
2087 | * @p: the task object | |
2088 | * @nice: unused | |
2089 | * | |
2090 | * Return 0 if write access is permitted | |
2091 | */ | |
2092 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2093 | { | |
b1d9e6b0 | 2094 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2095 | } |
2096 | ||
2097 | /** | |
2098 | * smack_task_setioprio - Smack check on setting ioprio | |
2099 | * @p: the task object | |
2100 | * @ioprio: unused | |
2101 | * | |
2102 | * Return 0 if write access is permitted | |
2103 | */ | |
2104 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2105 | { | |
b1d9e6b0 | 2106 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2107 | } |
2108 | ||
2109 | /** | |
2110 | * smack_task_getioprio - Smack check on reading ioprio | |
2111 | * @p: the task object | |
2112 | * | |
2113 | * Return 0 if read access is permitted | |
2114 | */ | |
2115 | static int smack_task_getioprio(struct task_struct *p) | |
2116 | { | |
531f1d45 | 2117 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2118 | } |
2119 | ||
2120 | /** | |
2121 | * smack_task_setscheduler - Smack check on setting scheduler | |
2122 | * @p: the task object | |
2123 | * @policy: unused | |
2124 | * @lp: unused | |
2125 | * | |
2126 | * Return 0 if read access is permitted | |
2127 | */ | |
b0ae1981 | 2128 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2129 | { |
b1d9e6b0 | 2130 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2131 | } |
2132 | ||
2133 | /** | |
2134 | * smack_task_getscheduler - Smack check on reading scheduler | |
2135 | * @p: the task object | |
2136 | * | |
2137 | * Return 0 if read access is permitted | |
2138 | */ | |
2139 | static int smack_task_getscheduler(struct task_struct *p) | |
2140 | { | |
531f1d45 | 2141 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2142 | } |
2143 | ||
2144 | /** | |
2145 | * smack_task_movememory - Smack check on moving memory | |
2146 | * @p: the task object | |
2147 | * | |
2148 | * Return 0 if write access is permitted | |
2149 | */ | |
2150 | static int smack_task_movememory(struct task_struct *p) | |
2151 | { | |
531f1d45 | 2152 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2153 | } |
2154 | ||
2155 | /** | |
2156 | * smack_task_kill - Smack check on signal delivery | |
2157 | * @p: the task object | |
2158 | * @info: unused | |
2159 | * @sig: unused | |
2160 | * @secid: identifies the smack to use in lieu of current's | |
2161 | * | |
2162 | * Return 0 if write access is permitted | |
2163 | * | |
2164 | * The secid behavior is an artifact of an SELinux hack | |
2165 | * in the USB code. Someday it may go away. | |
2166 | */ | |
2167 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
2168 | int sig, u32 secid) | |
2169 | { | |
ecfcc53f | 2170 | struct smk_audit_info ad; |
2f823ff8 | 2171 | struct smack_known *skp; |
6d1cff2a | 2172 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2173 | int rc; |
ecfcc53f EB |
2174 | |
2175 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
2176 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2177 | /* |
2178 | * Sending a signal requires that the sender | |
2179 | * can write the receiver. | |
2180 | */ | |
d166c802 | 2181 | if (secid == 0) { |
21c7eae2 | 2182 | rc = smk_curacc(tkp, MAY_WRITE, &ad); |
d166c802 CS |
2183 | rc = smk_bu_task(p, MAY_WRITE, rc); |
2184 | return rc; | |
2185 | } | |
e114e473 CS |
2186 | /* |
2187 | * If the secid isn't 0 we're dealing with some USB IO | |
2188 | * specific behavior. This is not clean. For one thing | |
2189 | * we can't take privilege into account. | |
2190 | */ | |
2f823ff8 | 2191 | skp = smack_from_secid(secid); |
21c7eae2 LP |
2192 | rc = smk_access(skp, tkp, MAY_WRITE, &ad); |
2193 | rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc); | |
d166c802 | 2194 | return rc; |
e114e473 CS |
2195 | } |
2196 | ||
2197 | /** | |
2198 | * smack_task_wait - Smack access check for waiting | |
2199 | * @p: task to wait for | |
2200 | * | |
c00bedb3 | 2201 | * Returns 0 |
e114e473 CS |
2202 | */ |
2203 | static int smack_task_wait(struct task_struct *p) | |
2204 | { | |
e114e473 | 2205 | /* |
c00bedb3 CS |
2206 | * Allow the operation to succeed. |
2207 | * Zombies are bad. | |
2208 | * In userless environments (e.g. phones) programs | |
2209 | * get marked with SMACK64EXEC and even if the parent | |
2210 | * and child shouldn't be talking the parent still | |
2211 | * may expect to know when the child exits. | |
e114e473 | 2212 | */ |
c00bedb3 | 2213 | return 0; |
e114e473 CS |
2214 | } |
2215 | ||
2216 | /** | |
2217 | * smack_task_to_inode - copy task smack into the inode blob | |
2218 | * @p: task to copy from | |
251a2a95 | 2219 | * @inode: inode to copy to |
e114e473 CS |
2220 | * |
2221 | * Sets the smack pointer in the inode security blob | |
2222 | */ | |
2223 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2224 | { | |
2225 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2226 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2227 | |
21c7eae2 | 2228 | isp->smk_inode = skp; |
e114e473 CS |
2229 | } |
2230 | ||
2231 | /* | |
2232 | * Socket hooks. | |
2233 | */ | |
2234 | ||
2235 | /** | |
2236 | * smack_sk_alloc_security - Allocate a socket blob | |
2237 | * @sk: the socket | |
2238 | * @family: unused | |
251a2a95 | 2239 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2240 | * |
2241 | * Assign Smack pointers to current | |
2242 | * | |
2243 | * Returns 0 on success, -ENOMEM is there's no memory | |
2244 | */ | |
2245 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2246 | { | |
2f823ff8 | 2247 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2248 | struct socket_smack *ssp; |
2249 | ||
2250 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2251 | if (ssp == NULL) | |
2252 | return -ENOMEM; | |
2253 | ||
54e70ec5 | 2254 | ssp->smk_in = skp; |
2f823ff8 | 2255 | ssp->smk_out = skp; |
272cd7a8 | 2256 | ssp->smk_packet = NULL; |
e114e473 CS |
2257 | |
2258 | sk->sk_security = ssp; | |
2259 | ||
2260 | return 0; | |
2261 | } | |
2262 | ||
2263 | /** | |
2264 | * smack_sk_free_security - Free a socket blob | |
2265 | * @sk: the socket | |
2266 | * | |
2267 | * Clears the blob pointer | |
2268 | */ | |
2269 | static void smack_sk_free_security(struct sock *sk) | |
2270 | { | |
2271 | kfree(sk->sk_security); | |
2272 | } | |
2273 | ||
07feee8f | 2274 | /** |
21abb1ec | 2275 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2276 | * @sip: the object end |
2277 | * | |
2278 | * looks for host based access restrictions | |
2279 | * | |
2280 | * This version will only be appropriate for really small sets of single label | |
2281 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2282 | * taken before calling this function. | |
2283 | * | |
2284 | * Returns the label of the far end or NULL if it's not special. | |
2285 | */ | |
21abb1ec | 2286 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2287 | { |
21abb1ec | 2288 | struct smk_net4addr *snp; |
07feee8f PM |
2289 | struct in_addr *siap = &sip->sin_addr; |
2290 | ||
2291 | if (siap->s_addr == 0) | |
2292 | return NULL; | |
2293 | ||
21abb1ec CS |
2294 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2295 | /* | |
2296 | * we break after finding the first match because | |
2297 | * the list is sorted from longest to shortest mask | |
2298 | * so we have found the most specific match | |
2299 | */ | |
2300 | if (snp->smk_host.s_addr == | |
2301 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2302 | return snp->smk_label; | |
2303 | ||
2304 | return NULL; | |
2305 | } | |
2306 | ||
2307 | #if IS_ENABLED(CONFIG_IPV6) | |
2308 | /* | |
2309 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2310 | * @sip: the address | |
2311 | * | |
2312 | * Returns boolean true if this is the localhost address | |
2313 | */ | |
2314 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2315 | { | |
2316 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2317 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2318 | ||
2319 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2320 | ntohs(be16p[7]) == 1) | |
2321 | return true; | |
2322 | return false; | |
2323 | } | |
2324 | ||
2325 | /** | |
2326 | * smack_ipv6host_label - check host based restrictions | |
2327 | * @sip: the object end | |
2328 | * | |
2329 | * looks for host based access restrictions | |
2330 | * | |
2331 | * This version will only be appropriate for really small sets of single label | |
2332 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2333 | * taken before calling this function. | |
2334 | * | |
2335 | * Returns the label of the far end or NULL if it's not special. | |
2336 | */ | |
2337 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2338 | { | |
2339 | struct smk_net6addr *snp; | |
2340 | struct in6_addr *sap = &sip->sin6_addr; | |
2341 | int i; | |
2342 | int found = 0; | |
2343 | ||
2344 | /* | |
2345 | * It's local. Don't look for a host label. | |
2346 | */ | |
2347 | if (smk_ipv6_localhost(sip)) | |
2348 | return NULL; | |
2349 | ||
2350 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
07feee8f PM |
2351 | /* |
2352 | * we break after finding the first match because | |
2353 | * the list is sorted from longest to shortest mask | |
2354 | * so we have found the most specific match | |
2355 | */ | |
21abb1ec CS |
2356 | for (found = 1, i = 0; i < 8; i++) { |
2357 | /* | |
2358 | * If the label is NULL the entry has | |
2359 | * been renounced. Ignore it. | |
2360 | */ | |
2361 | if (snp->smk_label == NULL) | |
2362 | continue; | |
2363 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != | |
2364 | snp->smk_host.s6_addr16[i]) { | |
2365 | found = 0; | |
2366 | break; | |
2367 | } | |
4303154e | 2368 | } |
21abb1ec CS |
2369 | if (found) |
2370 | return snp->smk_label; | |
2371 | } | |
07feee8f PM |
2372 | |
2373 | return NULL; | |
2374 | } | |
21abb1ec | 2375 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2376 | |
e114e473 CS |
2377 | /** |
2378 | * smack_netlabel - Set the secattr on a socket | |
2379 | * @sk: the socket | |
6d3dc07c | 2380 | * @labeled: socket label scheme |
e114e473 CS |
2381 | * |
2382 | * Convert the outbound smack value (smk_out) to a | |
2383 | * secattr and attach it to the socket. | |
2384 | * | |
2385 | * Returns 0 on success or an error code | |
2386 | */ | |
6d3dc07c | 2387 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2388 | { |
f7112e6c | 2389 | struct smack_known *skp; |
07feee8f | 2390 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2391 | int rc = 0; |
e114e473 | 2392 | |
6d3dc07c CS |
2393 | /* |
2394 | * Usually the netlabel code will handle changing the | |
2395 | * packet labeling based on the label. | |
2396 | * The case of a single label host is different, because | |
2397 | * a single label host should never get a labeled packet | |
2398 | * even though the label is usually associated with a packet | |
2399 | * label. | |
2400 | */ | |
2401 | local_bh_disable(); | |
2402 | bh_lock_sock_nested(sk); | |
2403 | ||
2404 | if (ssp->smk_out == smack_net_ambient || | |
2405 | labeled == SMACK_UNLABELED_SOCKET) | |
2406 | netlbl_sock_delattr(sk); | |
2407 | else { | |
2f823ff8 | 2408 | skp = ssp->smk_out; |
f7112e6c | 2409 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2410 | } |
2411 | ||
2412 | bh_unlock_sock(sk); | |
2413 | local_bh_enable(); | |
4bc87e62 | 2414 | |
e114e473 CS |
2415 | return rc; |
2416 | } | |
2417 | ||
07feee8f PM |
2418 | /** |
2419 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2420 | * @sk: the socket | |
2421 | * @sap: the destination address | |
2422 | * | |
2423 | * Set the correct secattr for the given socket based on the destination | |
2424 | * address and perform any outbound access checks needed. | |
2425 | * | |
2426 | * Returns 0 on success or an error code. | |
2427 | * | |
2428 | */ | |
2429 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2430 | { | |
2f823ff8 | 2431 | struct smack_known *skp; |
07feee8f PM |
2432 | int rc; |
2433 | int sk_lbl; | |
21c7eae2 | 2434 | struct smack_known *hkp; |
07feee8f | 2435 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2436 | struct smk_audit_info ad; |
07feee8f PM |
2437 | |
2438 | rcu_read_lock(); | |
21abb1ec | 2439 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2440 | if (hkp != NULL) { |
ecfcc53f | 2441 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2442 | struct lsm_network_audit net; |
2443 | ||
48c62af6 EP |
2444 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2445 | ad.a.u.net->family = sap->sin_family; | |
2446 | ad.a.u.net->dport = sap->sin_port; | |
2447 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2448 | #endif |
923e9a13 | 2449 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2450 | skp = ssp->smk_out; |
21c7eae2 LP |
2451 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2452 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2453 | } else { |
2454 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2455 | rc = 0; | |
2456 | } | |
2457 | rcu_read_unlock(); | |
2458 | if (rc != 0) | |
2459 | return rc; | |
2460 | ||
2461 | return smack_netlabel(sk, sk_lbl); | |
2462 | } | |
2463 | ||
21abb1ec CS |
2464 | #if IS_ENABLED(CONFIG_IPV6) |
2465 | /** | |
2466 | * smk_ipv6_check - check Smack access | |
2467 | * @subject: subject Smack label | |
2468 | * @object: object Smack label | |
2469 | * @address: address | |
2470 | * @act: the action being taken | |
2471 | * | |
2472 | * Check an IPv6 access | |
2473 | */ | |
2474 | static int smk_ipv6_check(struct smack_known *subject, | |
2475 | struct smack_known *object, | |
2476 | struct sockaddr_in6 *address, int act) | |
2477 | { | |
2478 | #ifdef CONFIG_AUDIT | |
2479 | struct lsm_network_audit net; | |
2480 | #endif | |
2481 | struct smk_audit_info ad; | |
2482 | int rc; | |
2483 | ||
2484 | #ifdef CONFIG_AUDIT | |
2485 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2486 | ad.a.u.net->family = PF_INET6; | |
2487 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2488 | if (act == SMK_RECEIVING) | |
2489 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2490 | else | |
2491 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2492 | #endif | |
2493 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2494 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2495 | return rc; | |
2496 | } | |
2497 | #endif /* CONFIG_IPV6 */ | |
2498 | ||
2499 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2500 | /** |
2501 | * smk_ipv6_port_label - Smack port access table management | |
2502 | * @sock: socket | |
2503 | * @address: address | |
2504 | * | |
2505 | * Create or update the port list entry | |
2506 | */ | |
2507 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2508 | { | |
2509 | struct sock *sk = sock->sk; | |
2510 | struct sockaddr_in6 *addr6; | |
2511 | struct socket_smack *ssp = sock->sk->sk_security; | |
2512 | struct smk_port_label *spp; | |
2513 | unsigned short port = 0; | |
2514 | ||
2515 | if (address == NULL) { | |
2516 | /* | |
2517 | * This operation is changing the Smack information | |
2518 | * on the bound socket. Take the changes to the port | |
2519 | * as well. | |
2520 | */ | |
2521 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2522 | if (sk != spp->smk_sock) | |
2523 | continue; | |
2524 | spp->smk_in = ssp->smk_in; | |
2525 | spp->smk_out = ssp->smk_out; | |
2526 | return; | |
2527 | } | |
2528 | /* | |
2529 | * A NULL address is only used for updating existing | |
2530 | * bound entries. If there isn't one, it's OK. | |
2531 | */ | |
2532 | return; | |
2533 | } | |
2534 | ||
2535 | addr6 = (struct sockaddr_in6 *)address; | |
2536 | port = ntohs(addr6->sin6_port); | |
2537 | /* | |
2538 | * This is a special case that is safely ignored. | |
2539 | */ | |
2540 | if (port == 0) | |
2541 | return; | |
2542 | ||
2543 | /* | |
2544 | * Look for an existing port list entry. | |
2545 | * This is an indication that a port is getting reused. | |
2546 | */ | |
2547 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2548 | if (spp->smk_port != port) | |
2549 | continue; | |
2550 | spp->smk_port = port; | |
2551 | spp->smk_sock = sk; | |
2552 | spp->smk_in = ssp->smk_in; | |
2553 | spp->smk_out = ssp->smk_out; | |
2554 | return; | |
2555 | } | |
2556 | ||
2557 | /* | |
2558 | * A new port entry is required. | |
2559 | */ | |
2560 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2561 | if (spp == NULL) | |
2562 | return; | |
2563 | ||
2564 | spp->smk_port = port; | |
2565 | spp->smk_sock = sk; | |
2566 | spp->smk_in = ssp->smk_in; | |
2567 | spp->smk_out = ssp->smk_out; | |
2568 | ||
2569 | list_add(&spp->list, &smk_ipv6_port_list); | |
2570 | return; | |
2571 | } | |
2572 | ||
2573 | /** | |
2574 | * smk_ipv6_port_check - check Smack port access | |
2575 | * @sock: socket | |
2576 | * @address: address | |
2577 | * | |
2578 | * Create or update the port list entry | |
2579 | */ | |
6ea06247 | 2580 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2581 | int act) |
2582 | { | |
c6739443 CS |
2583 | struct smk_port_label *spp; |
2584 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2585 | struct smack_known *skp = NULL; |
2586 | unsigned short port; | |
21c7eae2 | 2587 | struct smack_known *object; |
c6739443 CS |
2588 | |
2589 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2590 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2591 | object = ssp->smk_in; |
c6739443 | 2592 | } else { |
2f823ff8 | 2593 | skp = ssp->smk_out; |
21abb1ec | 2594 | object = smack_ipv6host_label(address); |
c6739443 CS |
2595 | } |
2596 | ||
2597 | /* | |
21abb1ec | 2598 | * The other end is a single label host. |
c6739443 | 2599 | */ |
21abb1ec CS |
2600 | if (skp != NULL && object != NULL) |
2601 | return smk_ipv6_check(skp, object, address, act); | |
2602 | if (skp == NULL) | |
2603 | skp = smack_net_ambient; | |
2604 | if (object == NULL) | |
2605 | object = smack_net_ambient; | |
c6739443 CS |
2606 | |
2607 | /* | |
2608 | * It's remote, so port lookup does no good. | |
2609 | */ | |
21abb1ec CS |
2610 | if (!smk_ipv6_localhost(address)) |
2611 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2612 | |
2613 | /* | |
2614 | * It's local so the send check has to have passed. | |
2615 | */ | |
21abb1ec CS |
2616 | if (act == SMK_RECEIVING) |
2617 | return 0; | |
c6739443 | 2618 | |
21abb1ec | 2619 | port = ntohs(address->sin6_port); |
c6739443 CS |
2620 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { |
2621 | if (spp->smk_port != port) | |
2622 | continue; | |
21c7eae2 | 2623 | object = spp->smk_in; |
c6739443 | 2624 | if (act == SMK_CONNECTING) |
54e70ec5 | 2625 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2626 | break; |
2627 | } | |
2628 | ||
21abb1ec | 2629 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2630 | } |
21abb1ec | 2631 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2632 | |
e114e473 CS |
2633 | /** |
2634 | * smack_inode_setsecurity - set smack xattrs | |
2635 | * @inode: the object | |
2636 | * @name: attribute name | |
2637 | * @value: attribute value | |
2638 | * @size: size of the attribute | |
2639 | * @flags: unused | |
2640 | * | |
2641 | * Sets the named attribute in the appropriate blob | |
2642 | * | |
2643 | * Returns 0 on success, or an error code | |
2644 | */ | |
2645 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2646 | const void *value, size_t size, int flags) | |
2647 | { | |
2f823ff8 | 2648 | struct smack_known *skp; |
e114e473 CS |
2649 | struct inode_smack *nsp = inode->i_security; |
2650 | struct socket_smack *ssp; | |
2651 | struct socket *sock; | |
4bc87e62 | 2652 | int rc = 0; |
e114e473 | 2653 | |
f7112e6c | 2654 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2655 | return -EINVAL; |
e114e473 | 2656 | |
2f823ff8 | 2657 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2658 | if (IS_ERR(skp)) |
2659 | return PTR_ERR(skp); | |
e114e473 CS |
2660 | |
2661 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2662 | nsp->smk_inode = skp; |
ddd29ec6 | 2663 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2664 | return 0; |
2665 | } | |
2666 | /* | |
2667 | * The rest of the Smack xattrs are only on sockets. | |
2668 | */ | |
2669 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2670 | return -EOPNOTSUPP; | |
2671 | ||
2672 | sock = SOCKET_I(inode); | |
2e1d146a | 2673 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2674 | return -EOPNOTSUPP; |
2675 | ||
2676 | ssp = sock->sk->sk_security; | |
2677 | ||
2678 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2679 | ssp->smk_in = skp; |
e114e473 | 2680 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2681 | ssp->smk_out = skp; |
c6739443 | 2682 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2683 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2684 | if (rc != 0) | |
2685 | printk(KERN_WARNING | |
2686 | "Smack: \"%s\" netlbl error %d.\n", | |
2687 | __func__, -rc); | |
2688 | } | |
e114e473 CS |
2689 | } else |
2690 | return -EOPNOTSUPP; | |
2691 | ||
21abb1ec | 2692 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2693 | if (sock->sk->sk_family == PF_INET6) |
2694 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2695 | #endif |
c6739443 | 2696 | |
e114e473 CS |
2697 | return 0; |
2698 | } | |
2699 | ||
2700 | /** | |
2701 | * smack_socket_post_create - finish socket setup | |
2702 | * @sock: the socket | |
2703 | * @family: protocol family | |
2704 | * @type: unused | |
2705 | * @protocol: unused | |
2706 | * @kern: unused | |
2707 | * | |
2708 | * Sets the netlabel information on the socket | |
2709 | * | |
2710 | * Returns 0 on success, and error code otherwise | |
2711 | */ | |
2712 | static int smack_socket_post_create(struct socket *sock, int family, | |
2713 | int type, int protocol, int kern) | |
2714 | { | |
7412301b ML |
2715 | struct socket_smack *ssp; |
2716 | ||
2717 | if (sock->sk == NULL) | |
2718 | return 0; | |
2719 | ||
2720 | /* | |
2721 | * Sockets created by kernel threads receive web label. | |
2722 | */ | |
2723 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2724 | ssp = sock->sk->sk_security; | |
2725 | ssp->smk_in = &smack_known_web; | |
2726 | ssp->smk_out = &smack_known_web; | |
2727 | } | |
2728 | ||
2729 | if (family != PF_INET) | |
e114e473 CS |
2730 | return 0; |
2731 | /* | |
2732 | * Set the outbound netlbl. | |
2733 | */ | |
6d3dc07c CS |
2734 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2735 | } | |
2736 | ||
21abb1ec | 2737 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2738 | /** |
2739 | * smack_socket_bind - record port binding information. | |
2740 | * @sock: the socket | |
2741 | * @address: the port address | |
2742 | * @addrlen: size of the address | |
2743 | * | |
2744 | * Records the label bound to a port. | |
2745 | * | |
2746 | * Returns 0 | |
2747 | */ | |
2748 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2749 | int addrlen) | |
2750 | { | |
2751 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2752 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2753 | return 0; |
2754 | } | |
21abb1ec | 2755 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2756 | |
6d3dc07c CS |
2757 | /** |
2758 | * smack_socket_connect - connect access check | |
2759 | * @sock: the socket | |
2760 | * @sap: the other end | |
2761 | * @addrlen: size of sap | |
2762 | * | |
2763 | * Verifies that a connection may be possible | |
2764 | * | |
2765 | * Returns 0 on success, and error code otherwise | |
2766 | */ | |
2767 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2768 | int addrlen) | |
2769 | { | |
c6739443 | 2770 | int rc = 0; |
21abb1ec CS |
2771 | #if IS_ENABLED(CONFIG_IPV6) |
2772 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2773 | #endif | |
2774 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2775 | struct smack_known *rsp; | |
2776 | struct socket_smack *ssp = sock->sk->sk_security; | |
2777 | #endif | |
c6739443 CS |
2778 | |
2779 | if (sock->sk == NULL) | |
6d3dc07c | 2780 | return 0; |
6d3dc07c | 2781 | |
c6739443 CS |
2782 | switch (sock->sk->sk_family) { |
2783 | case PF_INET: | |
2784 | if (addrlen < sizeof(struct sockaddr_in)) | |
2785 | return -EINVAL; | |
2786 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2787 | break; | |
2788 | case PF_INET6: | |
2789 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2790 | return -EINVAL; | |
21abb1ec CS |
2791 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2792 | rsp = smack_ipv6host_label(sip); | |
2793 | if (rsp != NULL) | |
2794 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2795 | SMK_CONNECTING); |
21abb1ec CS |
2796 | #endif |
2797 | #ifdef SMACK_IPV6_PORT_LABELING | |
2798 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2799 | #endif | |
c6739443 CS |
2800 | break; |
2801 | } | |
2802 | return rc; | |
e114e473 CS |
2803 | } |
2804 | ||
2805 | /** | |
2806 | * smack_flags_to_may - convert S_ to MAY_ values | |
2807 | * @flags: the S_ value | |
2808 | * | |
2809 | * Returns the equivalent MAY_ value | |
2810 | */ | |
2811 | static int smack_flags_to_may(int flags) | |
2812 | { | |
2813 | int may = 0; | |
2814 | ||
2815 | if (flags & S_IRUGO) | |
2816 | may |= MAY_READ; | |
2817 | if (flags & S_IWUGO) | |
2818 | may |= MAY_WRITE; | |
2819 | if (flags & S_IXUGO) | |
2820 | may |= MAY_EXEC; | |
2821 | ||
2822 | return may; | |
2823 | } | |
2824 | ||
2825 | /** | |
2826 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2827 | * @msg: the object | |
2828 | * | |
2829 | * Returns 0 | |
2830 | */ | |
2831 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2832 | { | |
2f823ff8 CS |
2833 | struct smack_known *skp = smk_of_current(); |
2834 | ||
21c7eae2 | 2835 | msg->security = skp; |
e114e473 CS |
2836 | return 0; |
2837 | } | |
2838 | ||
2839 | /** | |
2840 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2841 | * @msg: the object | |
2842 | * | |
2843 | * Clears the blob pointer | |
2844 | */ | |
2845 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2846 | { | |
2847 | msg->security = NULL; | |
2848 | } | |
2849 | ||
2850 | /** | |
2851 | * smack_of_shm - the smack pointer for the shm | |
2852 | * @shp: the object | |
2853 | * | |
2854 | * Returns a pointer to the smack value | |
2855 | */ | |
21c7eae2 | 2856 | static struct smack_known *smack_of_shm(struct shmid_kernel *shp) |
e114e473 | 2857 | { |
21c7eae2 | 2858 | return (struct smack_known *)shp->shm_perm.security; |
e114e473 CS |
2859 | } |
2860 | ||
2861 | /** | |
2862 | * smack_shm_alloc_security - Set the security blob for shm | |
2863 | * @shp: the object | |
2864 | * | |
2865 | * Returns 0 | |
2866 | */ | |
2867 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2868 | { | |
2869 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2870 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2871 | |
21c7eae2 | 2872 | isp->security = skp; |
e114e473 CS |
2873 | return 0; |
2874 | } | |
2875 | ||
2876 | /** | |
2877 | * smack_shm_free_security - Clear the security blob for shm | |
2878 | * @shp: the object | |
2879 | * | |
2880 | * Clears the blob pointer | |
2881 | */ | |
2882 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2883 | { | |
2884 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2885 | ||
2886 | isp->security = NULL; | |
2887 | } | |
2888 | ||
ecfcc53f EB |
2889 | /** |
2890 | * smk_curacc_shm : check if current has access on shm | |
2891 | * @shp : the object | |
2892 | * @access : access requested | |
2893 | * | |
2894 | * Returns 0 if current has the requested access, error code otherwise | |
2895 | */ | |
2896 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2897 | { | |
21c7eae2 | 2898 | struct smack_known *ssp = smack_of_shm(shp); |
ecfcc53f | 2899 | struct smk_audit_info ad; |
d166c802 | 2900 | int rc; |
ecfcc53f EB |
2901 | |
2902 | #ifdef CONFIG_AUDIT | |
2903 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2904 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2905 | #endif | |
d166c802 CS |
2906 | rc = smk_curacc(ssp, access, &ad); |
2907 | rc = smk_bu_current("shm", ssp, access, rc); | |
2908 | return rc; | |
ecfcc53f EB |
2909 | } |
2910 | ||
e114e473 CS |
2911 | /** |
2912 | * smack_shm_associate - Smack access check for shm | |
2913 | * @shp: the object | |
2914 | * @shmflg: access requested | |
2915 | * | |
2916 | * Returns 0 if current has the requested access, error code otherwise | |
2917 | */ | |
2918 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2919 | { | |
e114e473 CS |
2920 | int may; |
2921 | ||
2922 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2923 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2924 | } |
2925 | ||
2926 | /** | |
2927 | * smack_shm_shmctl - Smack access check for shm | |
2928 | * @shp: the object | |
2929 | * @cmd: what it wants to do | |
2930 | * | |
2931 | * Returns 0 if current has the requested access, error code otherwise | |
2932 | */ | |
2933 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2934 | { | |
e114e473 CS |
2935 | int may; |
2936 | ||
2937 | switch (cmd) { | |
2938 | case IPC_STAT: | |
2939 | case SHM_STAT: | |
2940 | may = MAY_READ; | |
2941 | break; | |
2942 | case IPC_SET: | |
2943 | case SHM_LOCK: | |
2944 | case SHM_UNLOCK: | |
2945 | case IPC_RMID: | |
2946 | may = MAY_READWRITE; | |
2947 | break; | |
2948 | case IPC_INFO: | |
2949 | case SHM_INFO: | |
2950 | /* | |
2951 | * System level information. | |
2952 | */ | |
2953 | return 0; | |
2954 | default: | |
2955 | return -EINVAL; | |
2956 | } | |
ecfcc53f | 2957 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2958 | } |
2959 | ||
2960 | /** | |
2961 | * smack_shm_shmat - Smack access for shmat | |
2962 | * @shp: the object | |
2963 | * @shmaddr: unused | |
2964 | * @shmflg: access requested | |
2965 | * | |
2966 | * Returns 0 if current has the requested access, error code otherwise | |
2967 | */ | |
2968 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2969 | int shmflg) | |
2970 | { | |
e114e473 CS |
2971 | int may; |
2972 | ||
2973 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2974 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2975 | } |
2976 | ||
2977 | /** | |
2978 | * smack_of_sem - the smack pointer for the sem | |
2979 | * @sma: the object | |
2980 | * | |
2981 | * Returns a pointer to the smack value | |
2982 | */ | |
21c7eae2 | 2983 | static struct smack_known *smack_of_sem(struct sem_array *sma) |
e114e473 | 2984 | { |
21c7eae2 | 2985 | return (struct smack_known *)sma->sem_perm.security; |
e114e473 CS |
2986 | } |
2987 | ||
2988 | /** | |
2989 | * smack_sem_alloc_security - Set the security blob for sem | |
2990 | * @sma: the object | |
2991 | * | |
2992 | * Returns 0 | |
2993 | */ | |
2994 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2995 | { | |
2996 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2997 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2998 | |
21c7eae2 | 2999 | isp->security = skp; |
e114e473 CS |
3000 | return 0; |
3001 | } | |
3002 | ||
3003 | /** | |
3004 | * smack_sem_free_security - Clear the security blob for sem | |
3005 | * @sma: the object | |
3006 | * | |
3007 | * Clears the blob pointer | |
3008 | */ | |
3009 | static void smack_sem_free_security(struct sem_array *sma) | |
3010 | { | |
3011 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
3012 | ||
3013 | isp->security = NULL; | |
3014 | } | |
3015 | ||
ecfcc53f EB |
3016 | /** |
3017 | * smk_curacc_sem : check if current has access on sem | |
3018 | * @sma : the object | |
3019 | * @access : access requested | |
3020 | * | |
3021 | * Returns 0 if current has the requested access, error code otherwise | |
3022 | */ | |
3023 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
3024 | { | |
21c7eae2 | 3025 | struct smack_known *ssp = smack_of_sem(sma); |
ecfcc53f | 3026 | struct smk_audit_info ad; |
d166c802 | 3027 | int rc; |
ecfcc53f EB |
3028 | |
3029 | #ifdef CONFIG_AUDIT | |
3030 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3031 | ad.a.u.ipc_id = sma->sem_perm.id; | |
3032 | #endif | |
d166c802 CS |
3033 | rc = smk_curacc(ssp, access, &ad); |
3034 | rc = smk_bu_current("sem", ssp, access, rc); | |
3035 | return rc; | |
ecfcc53f EB |
3036 | } |
3037 | ||
e114e473 CS |
3038 | /** |
3039 | * smack_sem_associate - Smack access check for sem | |
3040 | * @sma: the object | |
3041 | * @semflg: access requested | |
3042 | * | |
3043 | * Returns 0 if current has the requested access, error code otherwise | |
3044 | */ | |
3045 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
3046 | { | |
e114e473 CS |
3047 | int may; |
3048 | ||
3049 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 3050 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3051 | } |
3052 | ||
3053 | /** | |
3054 | * smack_sem_shmctl - Smack access check for sem | |
3055 | * @sma: the object | |
3056 | * @cmd: what it wants to do | |
3057 | * | |
3058 | * Returns 0 if current has the requested access, error code otherwise | |
3059 | */ | |
3060 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
3061 | { | |
e114e473 CS |
3062 | int may; |
3063 | ||
3064 | switch (cmd) { | |
3065 | case GETPID: | |
3066 | case GETNCNT: | |
3067 | case GETZCNT: | |
3068 | case GETVAL: | |
3069 | case GETALL: | |
3070 | case IPC_STAT: | |
3071 | case SEM_STAT: | |
3072 | may = MAY_READ; | |
3073 | break; | |
3074 | case SETVAL: | |
3075 | case SETALL: | |
3076 | case IPC_RMID: | |
3077 | case IPC_SET: | |
3078 | may = MAY_READWRITE; | |
3079 | break; | |
3080 | case IPC_INFO: | |
3081 | case SEM_INFO: | |
3082 | /* | |
3083 | * System level information | |
3084 | */ | |
3085 | return 0; | |
3086 | default: | |
3087 | return -EINVAL; | |
3088 | } | |
3089 | ||
ecfcc53f | 3090 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3091 | } |
3092 | ||
3093 | /** | |
3094 | * smack_sem_semop - Smack checks of semaphore operations | |
3095 | * @sma: the object | |
3096 | * @sops: unused | |
3097 | * @nsops: unused | |
3098 | * @alter: unused | |
3099 | * | |
3100 | * Treated as read and write in all cases. | |
3101 | * | |
3102 | * Returns 0 if access is allowed, error code otherwise | |
3103 | */ | |
3104 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
3105 | unsigned nsops, int alter) | |
3106 | { | |
ecfcc53f | 3107 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
3108 | } |
3109 | ||
3110 | /** | |
3111 | * smack_msg_alloc_security - Set the security blob for msg | |
3112 | * @msq: the object | |
3113 | * | |
3114 | * Returns 0 | |
3115 | */ | |
3116 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
3117 | { | |
3118 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 3119 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3120 | |
21c7eae2 | 3121 | kisp->security = skp; |
e114e473 CS |
3122 | return 0; |
3123 | } | |
3124 | ||
3125 | /** | |
3126 | * smack_msg_free_security - Clear the security blob for msg | |
3127 | * @msq: the object | |
3128 | * | |
3129 | * Clears the blob pointer | |
3130 | */ | |
3131 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
3132 | { | |
3133 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
3134 | ||
3135 | kisp->security = NULL; | |
3136 | } | |
3137 | ||
3138 | /** | |
3139 | * smack_of_msq - the smack pointer for the msq | |
3140 | * @msq: the object | |
3141 | * | |
21c7eae2 | 3142 | * Returns a pointer to the smack label entry |
e114e473 | 3143 | */ |
21c7eae2 | 3144 | static struct smack_known *smack_of_msq(struct msg_queue *msq) |
e114e473 | 3145 | { |
21c7eae2 | 3146 | return (struct smack_known *)msq->q_perm.security; |
e114e473 CS |
3147 | } |
3148 | ||
ecfcc53f EB |
3149 | /** |
3150 | * smk_curacc_msq : helper to check if current has access on msq | |
3151 | * @msq : the msq | |
3152 | * @access : access requested | |
3153 | * | |
3154 | * return 0 if current has access, error otherwise | |
3155 | */ | |
3156 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
3157 | { | |
21c7eae2 | 3158 | struct smack_known *msp = smack_of_msq(msq); |
ecfcc53f | 3159 | struct smk_audit_info ad; |
d166c802 | 3160 | int rc; |
ecfcc53f EB |
3161 | |
3162 | #ifdef CONFIG_AUDIT | |
3163 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3164 | ad.a.u.ipc_id = msq->q_perm.id; | |
3165 | #endif | |
d166c802 CS |
3166 | rc = smk_curacc(msp, access, &ad); |
3167 | rc = smk_bu_current("msq", msp, access, rc); | |
3168 | return rc; | |
ecfcc53f EB |
3169 | } |
3170 | ||
e114e473 CS |
3171 | /** |
3172 | * smack_msg_queue_associate - Smack access check for msg_queue | |
3173 | * @msq: the object | |
3174 | * @msqflg: access requested | |
3175 | * | |
3176 | * Returns 0 if current has the requested access, error code otherwise | |
3177 | */ | |
3178 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
3179 | { | |
e114e473 CS |
3180 | int may; |
3181 | ||
3182 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 3183 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3184 | } |
3185 | ||
3186 | /** | |
3187 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
3188 | * @msq: the object | |
3189 | * @cmd: what it wants to do | |
3190 | * | |
3191 | * Returns 0 if current has the requested access, error code otherwise | |
3192 | */ | |
3193 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
3194 | { | |
e114e473 CS |
3195 | int may; |
3196 | ||
3197 | switch (cmd) { | |
3198 | case IPC_STAT: | |
3199 | case MSG_STAT: | |
3200 | may = MAY_READ; | |
3201 | break; | |
3202 | case IPC_SET: | |
3203 | case IPC_RMID: | |
3204 | may = MAY_READWRITE; | |
3205 | break; | |
3206 | case IPC_INFO: | |
3207 | case MSG_INFO: | |
3208 | /* | |
3209 | * System level information | |
3210 | */ | |
3211 | return 0; | |
3212 | default: | |
3213 | return -EINVAL; | |
3214 | } | |
3215 | ||
ecfcc53f | 3216 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3217 | } |
3218 | ||
3219 | /** | |
3220 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3221 | * @msq: the object | |
3222 | * @msg: unused | |
3223 | * @msqflg: access requested | |
3224 | * | |
3225 | * Returns 0 if current has the requested access, error code otherwise | |
3226 | */ | |
3227 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
3228 | int msqflg) | |
3229 | { | |
ecfcc53f | 3230 | int may; |
e114e473 | 3231 | |
ecfcc53f EB |
3232 | may = smack_flags_to_may(msqflg); |
3233 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
3234 | } |
3235 | ||
3236 | /** | |
3237 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3238 | * @msq: the object | |
3239 | * @msg: unused | |
3240 | * @target: unused | |
3241 | * @type: unused | |
3242 | * @mode: unused | |
3243 | * | |
3244 | * Returns 0 if current has read and write access, error code otherwise | |
3245 | */ | |
3246 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
3247 | struct task_struct *target, long type, int mode) | |
3248 | { | |
ecfcc53f | 3249 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
3250 | } |
3251 | ||
3252 | /** | |
3253 | * smack_ipc_permission - Smack access for ipc_permission() | |
3254 | * @ipp: the object permissions | |
3255 | * @flag: access requested | |
3256 | * | |
3257 | * Returns 0 if current has read and write access, error code otherwise | |
3258 | */ | |
3259 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3260 | { | |
21c7eae2 | 3261 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3262 | int may = smack_flags_to_may(flag); |
3263 | struct smk_audit_info ad; | |
d166c802 | 3264 | int rc; |
e114e473 | 3265 | |
ecfcc53f EB |
3266 | #ifdef CONFIG_AUDIT |
3267 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3268 | ad.a.u.ipc_id = ipp->id; | |
3269 | #endif | |
21c7eae2 LP |
3270 | rc = smk_curacc(iskp, may, &ad); |
3271 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3272 | return rc; |
e114e473 CS |
3273 | } |
3274 | ||
d20bdda6 AD |
3275 | /** |
3276 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3277 | * @ipp: the object permissions |
d20bdda6 AD |
3278 | * @secid: where result will be saved |
3279 | */ | |
3280 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3281 | { | |
21c7eae2 | 3282 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3283 | |
21c7eae2 | 3284 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3285 | } |
3286 | ||
e114e473 CS |
3287 | /** |
3288 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3289 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3290 | * @inode: the object |
3291 | * | |
3292 | * Set the inode's security blob if it hasn't been done already. | |
3293 | */ | |
3294 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3295 | { | |
3296 | struct super_block *sbp; | |
3297 | struct superblock_smack *sbsp; | |
3298 | struct inode_smack *isp; | |
2f823ff8 CS |
3299 | struct smack_known *skp; |
3300 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3301 | struct smack_known *final; |
5c6d1125 JS |
3302 | char trattr[TRANS_TRUE_SIZE]; |
3303 | int transflag = 0; | |
2267b13a | 3304 | int rc; |
e114e473 CS |
3305 | struct dentry *dp; |
3306 | ||
3307 | if (inode == NULL) | |
3308 | return; | |
3309 | ||
3310 | isp = inode->i_security; | |
3311 | ||
3312 | mutex_lock(&isp->smk_lock); | |
3313 | /* | |
3314 | * If the inode is already instantiated | |
3315 | * take the quick way out | |
3316 | */ | |
3317 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3318 | goto unlockandout; | |
3319 | ||
3320 | sbp = inode->i_sb; | |
3321 | sbsp = sbp->s_security; | |
3322 | /* | |
3323 | * We're going to use the superblock default label | |
3324 | * if there's no label on the file. | |
3325 | */ | |
3326 | final = sbsp->smk_default; | |
3327 | ||
e97dcb0e CS |
3328 | /* |
3329 | * If this is the root inode the superblock | |
3330 | * may be in the process of initialization. | |
3331 | * If that is the case use the root value out | |
3332 | * of the superblock. | |
3333 | */ | |
3334 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3335 | switch (sbp->s_magic) { |
3336 | case CGROUP_SUPER_MAGIC: | |
36ea735b CS |
3337 | /* |
3338 | * The cgroup filesystem is never mounted, | |
3339 | * so there's no opportunity to set the mount | |
3340 | * options. | |
3341 | */ | |
21c7eae2 LP |
3342 | sbsp->smk_root = &smack_known_star; |
3343 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3344 | isp->smk_inode = sbsp->smk_root; |
3345 | break; | |
3346 | case TMPFS_MAGIC: | |
3347 | /* | |
3348 | * What about shmem/tmpfs anonymous files with dentry | |
3349 | * obtained from d_alloc_pseudo()? | |
3350 | */ | |
3351 | isp->smk_inode = smk_of_current(); | |
3352 | break; | |
3353 | default: | |
3354 | isp->smk_inode = sbsp->smk_root; | |
3355 | break; | |
36ea735b | 3356 | } |
e97dcb0e CS |
3357 | isp->smk_flags |= SMK_INODE_INSTANT; |
3358 | goto unlockandout; | |
3359 | } | |
3360 | ||
e114e473 CS |
3361 | /* |
3362 | * This is pretty hackish. | |
3363 | * Casey says that we shouldn't have to do | |
3364 | * file system specific code, but it does help | |
3365 | * with keeping it simple. | |
3366 | */ | |
3367 | switch (sbp->s_magic) { | |
3368 | case SMACK_MAGIC: | |
36ea735b CS |
3369 | case PIPEFS_MAGIC: |
3370 | case SOCKFS_MAGIC: | |
3371 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 3372 | /* |
25985edc | 3373 | * Casey says that it's a little embarrassing |
e114e473 CS |
3374 | * that the smack file system doesn't do |
3375 | * extended attributes. | |
36ea735b | 3376 | * |
e114e473 | 3377 | * Casey says pipes are easy (?) |
36ea735b CS |
3378 | * |
3379 | * Socket access is controlled by the socket | |
3380 | * structures associated with the task involved. | |
3381 | * | |
3382 | * Cgroupfs is special | |
e114e473 | 3383 | */ |
21c7eae2 | 3384 | final = &smack_known_star; |
e114e473 CS |
3385 | break; |
3386 | case DEVPTS_SUPER_MAGIC: | |
3387 | /* | |
3388 | * devpts seems content with the label of the task. | |
3389 | * Programs that change smack have to treat the | |
3390 | * pty with respect. | |
3391 | */ | |
21c7eae2 | 3392 | final = ckp; |
e114e473 | 3393 | break; |
e114e473 CS |
3394 | case PROC_SUPER_MAGIC: |
3395 | /* | |
3396 | * Casey says procfs appears not to care. | |
3397 | * The superblock default suffices. | |
3398 | */ | |
3399 | break; | |
3400 | case TMPFS_MAGIC: | |
3401 | /* | |
3402 | * Device labels should come from the filesystem, | |
3403 | * but watch out, because they're volitile, | |
3404 | * getting recreated on every reboot. | |
3405 | */ | |
21c7eae2 | 3406 | final = &smack_known_star; |
e114e473 CS |
3407 | /* |
3408 | * No break. | |
3409 | * | |
3410 | * If a smack value has been set we want to use it, | |
3411 | * but since tmpfs isn't giving us the opportunity | |
3412 | * to set mount options simulate setting the | |
3413 | * superblock default. | |
3414 | */ | |
3415 | default: | |
3416 | /* | |
3417 | * This isn't an understood special case. | |
3418 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3419 | */ |
3420 | ||
3421 | /* | |
3422 | * UNIX domain sockets use lower level socket data. | |
3423 | */ | |
3424 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3425 | final = &smack_known_star; |
b4e0d5f0 CS |
3426 | break; |
3427 | } | |
3428 | /* | |
e114e473 CS |
3429 | * No xattr support means, alas, no SMACK label. |
3430 | * Use the aforeapplied default. | |
3431 | * It would be curious if the label of the task | |
3432 | * does not match that assigned. | |
3433 | */ | |
3434 | if (inode->i_op->getxattr == NULL) | |
3435 | break; | |
3436 | /* | |
3437 | * Get the dentry for xattr. | |
3438 | */ | |
3e62cbb8 | 3439 | dp = dget(opt_dentry); |
2f823ff8 | 3440 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3441 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3442 | final = skp; |
2267b13a CS |
3443 | |
3444 | /* | |
3445 | * Transmuting directory | |
3446 | */ | |
3447 | if (S_ISDIR(inode->i_mode)) { | |
3448 | /* | |
3449 | * If this is a new directory and the label was | |
3450 | * transmuted when the inode was initialized | |
3451 | * set the transmute attribute on the directory | |
3452 | * and mark the inode. | |
3453 | * | |
3454 | * If there is a transmute attribute on the | |
3455 | * directory mark the inode. | |
3456 | */ | |
3457 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3458 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
3459 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 3460 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3461 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3462 | 0); | |
3463 | } else { | |
3464 | rc = inode->i_op->getxattr(dp, | |
3465 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3466 | TRANS_TRUE_SIZE); | |
3467 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3468 | TRANS_TRUE_SIZE) != 0) | |
3469 | rc = -EINVAL; | |
5c6d1125 | 3470 | } |
2267b13a CS |
3471 | if (rc >= 0) |
3472 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3473 | } |
19760ad0 CS |
3474 | /* |
3475 | * Don't let the exec or mmap label be "*" or "@". | |
3476 | */ | |
3477 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
e774ad68 LP |
3478 | if (IS_ERR(skp) || skp == &smack_known_star || |
3479 | skp == &smack_known_web) | |
19760ad0 CS |
3480 | skp = NULL; |
3481 | isp->smk_task = skp; | |
e774ad68 | 3482 | |
19760ad0 | 3483 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3484 | if (IS_ERR(skp) || skp == &smack_known_star || |
3485 | skp == &smack_known_web) | |
19760ad0 CS |
3486 | skp = NULL; |
3487 | isp->smk_mmap = skp; | |
676dac4b | 3488 | |
e114e473 CS |
3489 | dput(dp); |
3490 | break; | |
3491 | } | |
3492 | ||
3493 | if (final == NULL) | |
21c7eae2 | 3494 | isp->smk_inode = ckp; |
e114e473 CS |
3495 | else |
3496 | isp->smk_inode = final; | |
3497 | ||
5c6d1125 | 3498 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3499 | |
3500 | unlockandout: | |
3501 | mutex_unlock(&isp->smk_lock); | |
3502 | return; | |
3503 | } | |
3504 | ||
3505 | /** | |
3506 | * smack_getprocattr - Smack process attribute access | |
3507 | * @p: the object task | |
3508 | * @name: the name of the attribute in /proc/.../attr | |
3509 | * @value: where to put the result | |
3510 | * | |
3511 | * Places a copy of the task Smack into value | |
3512 | * | |
3513 | * Returns the length of the smack label or an error code | |
3514 | */ | |
3515 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3516 | { | |
6d1cff2a | 3517 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3518 | char *cp; |
3519 | int slen; | |
3520 | ||
3521 | if (strcmp(name, "current") != 0) | |
3522 | return -EINVAL; | |
3523 | ||
2f823ff8 | 3524 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3525 | if (cp == NULL) |
3526 | return -ENOMEM; | |
3527 | ||
3528 | slen = strlen(cp); | |
3529 | *value = cp; | |
3530 | return slen; | |
3531 | } | |
3532 | ||
3533 | /** | |
3534 | * smack_setprocattr - Smack process attribute setting | |
3535 | * @p: the object task | |
3536 | * @name: the name of the attribute in /proc/.../attr | |
3537 | * @value: the value to set | |
3538 | * @size: the size of the value | |
3539 | * | |
3540 | * Sets the Smack value of the task. Only setting self | |
3541 | * is permitted and only with privilege | |
3542 | * | |
3543 | * Returns the length of the smack label or an error code | |
3544 | */ | |
3545 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3546 | void *value, size_t size) | |
3547 | { | |
676dac4b | 3548 | struct task_smack *tsp; |
d84f4f99 | 3549 | struct cred *new; |
2f823ff8 | 3550 | struct smack_known *skp; |
e114e473 | 3551 | |
e114e473 CS |
3552 | /* |
3553 | * Changing another process' Smack value is too dangerous | |
3554 | * and supports no sane use case. | |
3555 | */ | |
3556 | if (p != current) | |
3557 | return -EPERM; | |
3558 | ||
1880eff7 | 3559 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3560 | return -EPERM; |
3561 | ||
f7112e6c | 3562 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3563 | return -EINVAL; |
3564 | ||
3565 | if (strcmp(name, "current") != 0) | |
3566 | return -EINVAL; | |
3567 | ||
2f823ff8 | 3568 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3569 | if (IS_ERR(skp)) |
3570 | return PTR_ERR(skp); | |
e114e473 | 3571 | |
6d3dc07c CS |
3572 | /* |
3573 | * No process is ever allowed the web ("@") label. | |
3574 | */ | |
2f823ff8 | 3575 | if (skp == &smack_known_web) |
6d3dc07c CS |
3576 | return -EPERM; |
3577 | ||
d84f4f99 | 3578 | new = prepare_creds(); |
6d3dc07c | 3579 | if (new == NULL) |
d84f4f99 | 3580 | return -ENOMEM; |
7898e1f8 | 3581 | |
46a2f3b9 | 3582 | tsp = new->security; |
2f823ff8 | 3583 | tsp->smk_task = skp; |
7898e1f8 | 3584 | |
d84f4f99 | 3585 | commit_creds(new); |
e114e473 CS |
3586 | return size; |
3587 | } | |
3588 | ||
3589 | /** | |
3590 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3591 | * @sock: one sock |
3592 | * @other: the other sock | |
e114e473 CS |
3593 | * @newsk: unused |
3594 | * | |
3595 | * Return 0 if a subject with the smack of sock could access | |
3596 | * an object with the smack of other, otherwise an error code | |
3597 | */ | |
3610cda5 DM |
3598 | static int smack_unix_stream_connect(struct sock *sock, |
3599 | struct sock *other, struct sock *newsk) | |
e114e473 | 3600 | { |
2f823ff8 | 3601 | struct smack_known *skp; |
54e70ec5 | 3602 | struct smack_known *okp; |
d2e7ad19 JM |
3603 | struct socket_smack *ssp = sock->sk_security; |
3604 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3605 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3606 | struct smk_audit_info ad; |
b4e0d5f0 | 3607 | int rc = 0; |
923e9a13 KC |
3608 | #ifdef CONFIG_AUDIT |
3609 | struct lsm_network_audit net; | |
923e9a13 | 3610 | #endif |
b4e0d5f0 | 3611 | |
2f823ff8 CS |
3612 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3613 | skp = ssp->smk_out; | |
96be7b54 | 3614 | okp = osp->smk_in; |
54e70ec5 CS |
3615 | #ifdef CONFIG_AUDIT |
3616 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3617 | smk_ad_setfield_u_net_sk(&ad, other); | |
3618 | #endif | |
21c7eae2 LP |
3619 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3620 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3621 | if (rc == 0) { |
96be7b54 ZJ |
3622 | okp = osp->smk_out; |
3623 | skp = ssp->smk_in; | |
138a868f | 3624 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3625 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3626 | MAY_WRITE, rc); |
3627 | } | |
2f823ff8 | 3628 | } |
b4e0d5f0 | 3629 | |
975d5e55 CS |
3630 | /* |
3631 | * Cross reference the peer labels for SO_PEERSEC. | |
3632 | */ | |
3633 | if (rc == 0) { | |
54e70ec5 CS |
3634 | nsp->smk_packet = ssp->smk_out; |
3635 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3636 | } |
3637 | ||
b4e0d5f0 | 3638 | return rc; |
e114e473 CS |
3639 | } |
3640 | ||
3641 | /** | |
3642 | * smack_unix_may_send - Smack access on UDS | |
3643 | * @sock: one socket | |
3644 | * @other: the other socket | |
3645 | * | |
3646 | * Return 0 if a subject with the smack of sock could access | |
3647 | * an object with the smack of other, otherwise an error code | |
3648 | */ | |
3649 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3650 | { | |
b4e0d5f0 CS |
3651 | struct socket_smack *ssp = sock->sk->sk_security; |
3652 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3653 | struct smk_audit_info ad; |
d166c802 | 3654 | int rc; |
e114e473 | 3655 | |
923e9a13 KC |
3656 | #ifdef CONFIG_AUDIT |
3657 | struct lsm_network_audit net; | |
3658 | ||
48c62af6 | 3659 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3660 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3661 | #endif |
b4e0d5f0 | 3662 | |
2f823ff8 CS |
3663 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3664 | return 0; | |
b4e0d5f0 | 3665 | |
21c7eae2 LP |
3666 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3667 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3668 | return rc; |
e114e473 CS |
3669 | } |
3670 | ||
6d3dc07c CS |
3671 | /** |
3672 | * smack_socket_sendmsg - Smack check based on destination host | |
3673 | * @sock: the socket | |
251a2a95 | 3674 | * @msg: the message |
6d3dc07c CS |
3675 | * @size: the size of the message |
3676 | * | |
c6739443 CS |
3677 | * Return 0 if the current subject can write to the destination host. |
3678 | * For IPv4 this is only a question if the destination is a single label host. | |
3679 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3680 | */ |
3681 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3682 | int size) | |
3683 | { | |
3684 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3685 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3686 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3687 | #endif |
3688 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3689 | struct socket_smack *ssp = sock->sk->sk_security; | |
3690 | struct smack_known *rsp; | |
3691 | #endif | |
c6739443 | 3692 | int rc = 0; |
6d3dc07c CS |
3693 | |
3694 | /* | |
3695 | * Perfectly reasonable for this to be NULL | |
3696 | */ | |
c6739443 | 3697 | if (sip == NULL) |
6d3dc07c CS |
3698 | return 0; |
3699 | ||
c6739443 CS |
3700 | switch (sip->sin_family) { |
3701 | case AF_INET: | |
3702 | rc = smack_netlabel_send(sock->sk, sip); | |
3703 | break; | |
3704 | case AF_INET6: | |
21abb1ec CS |
3705 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3706 | rsp = smack_ipv6host_label(sap); | |
3707 | if (rsp != NULL) | |
3708 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3709 | SMK_CONNECTING); | |
3710 | #endif | |
3711 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3712 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3713 | #endif |
c6739443 CS |
3714 | break; |
3715 | } | |
3716 | return rc; | |
6d3dc07c CS |
3717 | } |
3718 | ||
e114e473 | 3719 | /** |
251a2a95 | 3720 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3721 | * @sap: netlabel secattr |
272cd7a8 | 3722 | * @ssp: socket security information |
e114e473 | 3723 | * |
2f823ff8 | 3724 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3725 | */ |
2f823ff8 CS |
3726 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3727 | struct socket_smack *ssp) | |
e114e473 | 3728 | { |
2f823ff8 | 3729 | struct smack_known *skp; |
f7112e6c | 3730 | int found = 0; |
677264e8 CS |
3731 | int acat; |
3732 | int kcat; | |
e114e473 | 3733 | |
6d3dc07c | 3734 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3735 | /* |
6d3dc07c | 3736 | * Looks like a CIPSO packet. |
e114e473 CS |
3737 | * If there are flags but no level netlabel isn't |
3738 | * behaving the way we expect it to. | |
3739 | * | |
f7112e6c | 3740 | * Look it up in the label table |
e114e473 CS |
3741 | * Without guidance regarding the smack value |
3742 | * for the packet fall back on the network | |
3743 | * ambient value. | |
3744 | */ | |
f7112e6c | 3745 | rcu_read_lock(); |
2f823ff8 CS |
3746 | list_for_each_entry(skp, &smack_known_list, list) { |
3747 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3748 | continue; |
677264e8 CS |
3749 | /* |
3750 | * Compare the catsets. Use the netlbl APIs. | |
3751 | */ | |
3752 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3753 | if ((skp->smk_netlabel.flags & | |
3754 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3755 | found = 1; | |
3756 | break; | |
3757 | } | |
3758 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3759 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3760 | acat + 1); | |
3761 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3762 | skp->smk_netlabel.attr.mls.cat, |
3763 | kcat + 1); | |
3764 | if (acat < 0 || kcat < 0) | |
3765 | break; | |
3766 | } | |
3767 | if (acat == kcat) { | |
3768 | found = 1; | |
3769 | break; | |
3770 | } | |
6d3dc07c | 3771 | } |
f7112e6c CS |
3772 | rcu_read_unlock(); |
3773 | ||
3774 | if (found) | |
2f823ff8 | 3775 | return skp; |
f7112e6c | 3776 | |
54e70ec5 | 3777 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3778 | return &smack_known_web; |
3779 | return &smack_known_star; | |
e114e473 | 3780 | } |
6d3dc07c CS |
3781 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3782 | /* | |
3783 | * Looks like a fallback, which gives us a secid. | |
3784 | */ | |
2f823ff8 | 3785 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3786 | /* |
3787 | * This has got to be a bug because it is | |
3788 | * impossible to specify a fallback without | |
3789 | * specifying the label, which will ensure | |
3790 | * it has a secid, and the only way to get a | |
3791 | * secid is from a fallback. | |
3792 | */ | |
2f823ff8 CS |
3793 | BUG_ON(skp == NULL); |
3794 | return skp; | |
e114e473 CS |
3795 | } |
3796 | /* | |
6d3dc07c CS |
3797 | * Without guidance regarding the smack value |
3798 | * for the packet fall back on the network | |
3799 | * ambient value. | |
e114e473 | 3800 | */ |
272cd7a8 | 3801 | return smack_net_ambient; |
e114e473 CS |
3802 | } |
3803 | ||
69f287ae | 3804 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3805 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3806 | { |
c6739443 CS |
3807 | u8 nexthdr; |
3808 | int offset; | |
3809 | int proto = -EINVAL; | |
3810 | struct ipv6hdr _ipv6h; | |
3811 | struct ipv6hdr *ip6; | |
3812 | __be16 frag_off; | |
3813 | struct tcphdr _tcph, *th; | |
3814 | struct udphdr _udph, *uh; | |
3815 | struct dccp_hdr _dccph, *dh; | |
3816 | ||
3817 | sip->sin6_port = 0; | |
3818 | ||
3819 | offset = skb_network_offset(skb); | |
3820 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3821 | if (ip6 == NULL) | |
3822 | return -EINVAL; | |
3823 | sip->sin6_addr = ip6->saddr; | |
3824 | ||
3825 | nexthdr = ip6->nexthdr; | |
3826 | offset += sizeof(_ipv6h); | |
3827 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3828 | if (offset < 0) | |
3829 | return -EINVAL; | |
3830 | ||
3831 | proto = nexthdr; | |
3832 | switch (proto) { | |
3833 | case IPPROTO_TCP: | |
3834 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3835 | if (th != NULL) | |
3836 | sip->sin6_port = th->source; | |
3837 | break; | |
3838 | case IPPROTO_UDP: | |
3839 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3840 | if (uh != NULL) | |
3841 | sip->sin6_port = uh->source; | |
3842 | break; | |
3843 | case IPPROTO_DCCP: | |
3844 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3845 | if (dh != NULL) | |
3846 | sip->sin6_port = dh->dccph_sport; | |
3847 | break; | |
3848 | } | |
3849 | return proto; | |
3850 | } | |
69f287ae | 3851 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3852 | |
e114e473 CS |
3853 | /** |
3854 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3855 | * @sk: socket | |
3856 | * @skb: packet | |
3857 | * | |
3858 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3859 | */ | |
3860 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3861 | { | |
3862 | struct netlbl_lsm_secattr secattr; | |
3863 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3864 | struct smack_known *skp = NULL; |
c6739443 | 3865 | int rc = 0; |
ecfcc53f | 3866 | struct smk_audit_info ad; |
923e9a13 | 3867 | #ifdef CONFIG_AUDIT |
48c62af6 | 3868 | struct lsm_network_audit net; |
923e9a13 | 3869 | #endif |
69f287ae CS |
3870 | #if IS_ENABLED(CONFIG_IPV6) |
3871 | struct sockaddr_in6 sadd; | |
3872 | int proto; | |
3873 | #endif /* CONFIG_IPV6 */ | |
3874 | ||
c6739443 CS |
3875 | switch (sk->sk_family) { |
3876 | case PF_INET: | |
69f287ae CS |
3877 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3878 | /* | |
3879 | * If there is a secmark use it rather than the CIPSO label. | |
3880 | * If there is no secmark fall back to CIPSO. | |
3881 | * The secmark is assumed to reflect policy better. | |
3882 | */ | |
3883 | if (skb && skb->secmark != 0) { | |
3884 | skp = smack_from_secid(skb->secmark); | |
3885 | goto access_check; | |
3886 | } | |
3887 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3888 | /* |
3889 | * Translate what netlabel gave us. | |
3890 | */ | |
3891 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3892 | |
c6739443 CS |
3893 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3894 | if (rc == 0) | |
2f823ff8 | 3895 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3896 | else |
2f823ff8 | 3897 | skp = smack_net_ambient; |
6d3dc07c | 3898 | |
c6739443 | 3899 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3900 | |
69f287ae CS |
3901 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3902 | access_check: | |
3903 | #endif | |
ecfcc53f | 3904 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3905 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3906 | ad.a.u.net->family = sk->sk_family; | |
3907 | ad.a.u.net->netif = skb->skb_iif; | |
3908 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3909 | #endif |
c6739443 CS |
3910 | /* |
3911 | * Receiving a packet requires that the other end | |
3912 | * be able to write here. Read access is not required. | |
3913 | * This is the simplist possible security model | |
3914 | * for networking. | |
3915 | */ | |
21c7eae2 LP |
3916 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3917 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3918 | MAY_WRITE, rc); |
c6739443 CS |
3919 | if (rc != 0) |
3920 | netlbl_skbuff_err(skb, rc, 0); | |
3921 | break; | |
69f287ae | 3922 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3923 | case PF_INET6: |
69f287ae CS |
3924 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
3925 | if (proto != IPPROTO_UDP && proto != IPPROTO_TCP) | |
3926 | break; | |
21abb1ec | 3927 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
3928 | if (skb && skb->secmark != 0) |
3929 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 3930 | else |
21abb1ec CS |
3931 | skp = smack_ipv6host_label(&sadd); |
3932 | if (skp == NULL) | |
69f287ae CS |
3933 | skp = smack_net_ambient; |
3934 | #ifdef CONFIG_AUDIT | |
3935 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3936 | ad.a.u.net->family = sk->sk_family; | |
3937 | ad.a.u.net->netif = skb->skb_iif; | |
3938 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
3939 | #endif /* CONFIG_AUDIT */ | |
3940 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
3941 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
3942 | MAY_WRITE, rc); | |
21abb1ec CS |
3943 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
3944 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 3945 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 3946 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 3947 | break; |
69f287ae | 3948 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3949 | } |
69f287ae | 3950 | |
a8134296 | 3951 | return rc; |
e114e473 CS |
3952 | } |
3953 | ||
3954 | /** | |
3955 | * smack_socket_getpeersec_stream - pull in packet label | |
3956 | * @sock: the socket | |
3957 | * @optval: user's destination | |
3958 | * @optlen: size thereof | |
251a2a95 | 3959 | * @len: max thereof |
e114e473 CS |
3960 | * |
3961 | * returns zero on success, an error code otherwise | |
3962 | */ | |
3963 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3964 | char __user *optval, | |
3965 | int __user *optlen, unsigned len) | |
3966 | { | |
3967 | struct socket_smack *ssp; | |
272cd7a8 CS |
3968 | char *rcp = ""; |
3969 | int slen = 1; | |
e114e473 CS |
3970 | int rc = 0; |
3971 | ||
3972 | ssp = sock->sk->sk_security; | |
272cd7a8 | 3973 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 3974 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
3975 | slen = strlen(rcp) + 1; |
3976 | } | |
e114e473 CS |
3977 | |
3978 | if (slen > len) | |
3979 | rc = -ERANGE; | |
272cd7a8 | 3980 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3981 | rc = -EFAULT; |
3982 | ||
3983 | if (put_user(slen, optlen) != 0) | |
3984 | rc = -EFAULT; | |
3985 | ||
3986 | return rc; | |
3987 | } | |
3988 | ||
3989 | ||
3990 | /** | |
3991 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3992 | * @sock: the peer socket |
e114e473 CS |
3993 | * @skb: packet data |
3994 | * @secid: pointer to where to put the secid of the packet | |
3995 | * | |
3996 | * Sets the netlabel socket state on sk from parent | |
3997 | */ | |
3998 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3999 | struct sk_buff *skb, u32 *secid) | |
4000 | ||
4001 | { | |
4002 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4003 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4004 | struct smack_known *skp; |
b4e0d5f0 CS |
4005 | int family = PF_UNSPEC; |
4006 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4007 | int rc; |
4008 | ||
b4e0d5f0 CS |
4009 | if (skb != NULL) { |
4010 | if (skb->protocol == htons(ETH_P_IP)) | |
4011 | family = PF_INET; | |
69f287ae | 4012 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4013 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4014 | family = PF_INET6; | |
69f287ae | 4015 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4016 | } |
b4e0d5f0 CS |
4017 | if (family == PF_UNSPEC && sock != NULL) |
4018 | family = sock->sk->sk_family; | |
e114e473 | 4019 | |
69f287ae CS |
4020 | switch (family) { |
4021 | case PF_UNIX: | |
272cd7a8 | 4022 | ssp = sock->sk->sk_security; |
2f823ff8 | 4023 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4024 | break; |
4025 | case PF_INET: | |
4026 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4027 | s = skb->secmark; | |
4028 | if (s != 0) | |
4029 | break; | |
4030 | #endif | |
b4e0d5f0 CS |
4031 | /* |
4032 | * Translate what netlabel gave us. | |
4033 | */ | |
272cd7a8 CS |
4034 | if (sock != NULL && sock->sk != NULL) |
4035 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4036 | netlbl_secattr_init(&secattr); |
4037 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4038 | if (rc == 0) { | |
2f823ff8 CS |
4039 | skp = smack_from_secattr(&secattr, ssp); |
4040 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4041 | } |
4042 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4043 | break; |
69f287ae | 4044 | case PF_INET6: |
21abb1ec | 4045 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4046 | s = skb->secmark; |
21abb1ec | 4047 | #endif |
69f287ae | 4048 | break; |
b4e0d5f0 CS |
4049 | } |
4050 | *secid = s; | |
e114e473 CS |
4051 | if (s == 0) |
4052 | return -EINVAL; | |
e114e473 CS |
4053 | return 0; |
4054 | } | |
4055 | ||
4056 | /** | |
07feee8f PM |
4057 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4058 | * @sk: child sock | |
4059 | * @parent: parent socket | |
e114e473 | 4060 | * |
07feee8f PM |
4061 | * Set the smk_{in,out} state of an existing sock based on the process that |
4062 | * is creating the new socket. | |
e114e473 CS |
4063 | */ |
4064 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4065 | { | |
4066 | struct socket_smack *ssp; | |
2f823ff8 | 4067 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4068 | |
07feee8f PM |
4069 | if (sk == NULL || |
4070 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4071 | return; |
4072 | ||
4073 | ssp = sk->sk_security; | |
54e70ec5 | 4074 | ssp->smk_in = skp; |
2f823ff8 | 4075 | ssp->smk_out = skp; |
07feee8f | 4076 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4077 | } |
4078 | ||
4079 | /** | |
4080 | * smack_inet_conn_request - Smack access check on connect | |
4081 | * @sk: socket involved | |
4082 | * @skb: packet | |
4083 | * @req: unused | |
4084 | * | |
4085 | * Returns 0 if a task with the packet label could write to | |
4086 | * the socket, otherwise an error code | |
4087 | */ | |
4088 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4089 | struct request_sock *req) | |
4090 | { | |
07feee8f | 4091 | u16 family = sk->sk_family; |
f7112e6c | 4092 | struct smack_known *skp; |
e114e473 | 4093 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4094 | struct netlbl_lsm_secattr secattr; |
4095 | struct sockaddr_in addr; | |
4096 | struct iphdr *hdr; | |
21c7eae2 | 4097 | struct smack_known *hskp; |
e114e473 | 4098 | int rc; |
ecfcc53f | 4099 | struct smk_audit_info ad; |
923e9a13 | 4100 | #ifdef CONFIG_AUDIT |
48c62af6 | 4101 | struct lsm_network_audit net; |
923e9a13 | 4102 | #endif |
e114e473 | 4103 | |
69f287ae | 4104 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4105 | if (family == PF_INET6) { |
4106 | /* | |
4107 | * Handle mapped IPv4 packets arriving | |
4108 | * via IPv6 sockets. Don't set up netlabel | |
4109 | * processing on IPv6. | |
4110 | */ | |
4111 | if (skb->protocol == htons(ETH_P_IP)) | |
4112 | family = PF_INET; | |
4113 | else | |
4114 | return 0; | |
4115 | } | |
69f287ae | 4116 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4117 | |
7f368ad3 CS |
4118 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4119 | /* | |
4120 | * If there is a secmark use it rather than the CIPSO label. | |
4121 | * If there is no secmark fall back to CIPSO. | |
4122 | * The secmark is assumed to reflect policy better. | |
4123 | */ | |
4124 | if (skb && skb->secmark != 0) { | |
4125 | skp = smack_from_secid(skb->secmark); | |
4126 | goto access_check; | |
4127 | } | |
4128 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4129 | ||
07feee8f PM |
4130 | netlbl_secattr_init(&secattr); |
4131 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4132 | if (rc == 0) |
2f823ff8 | 4133 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4134 | else |
2f823ff8 | 4135 | skp = &smack_known_huh; |
07feee8f PM |
4136 | netlbl_secattr_destroy(&secattr); |
4137 | ||
7f368ad3 CS |
4138 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4139 | access_check: | |
4140 | #endif | |
4141 | ||
ecfcc53f | 4142 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4143 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4144 | ad.a.u.net->family = family; | |
4145 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4146 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4147 | #endif | |
e114e473 | 4148 | /* |
07feee8f PM |
4149 | * Receiving a packet requires that the other end be able to write |
4150 | * here. Read access is not required. | |
e114e473 | 4151 | */ |
21c7eae2 LP |
4152 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4153 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4154 | if (rc != 0) |
4155 | return rc; | |
4156 | ||
4157 | /* | |
4158 | * Save the peer's label in the request_sock so we can later setup | |
4159 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4160 | */ | |
2f823ff8 | 4161 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4162 | |
4163 | /* | |
4164 | * We need to decide if we want to label the incoming connection here | |
4165 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4166 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4167 | */ |
4168 | hdr = ip_hdr(skb); | |
4169 | addr.sin_addr.s_addr = hdr->saddr; | |
4170 | rcu_read_lock(); | |
21abb1ec | 4171 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4172 | rcu_read_unlock(); |
4173 | ||
21c7eae2 | 4174 | if (hskp == NULL) |
f7112e6c | 4175 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4176 | else |
07feee8f | 4177 | netlbl_req_delattr(req); |
e114e473 CS |
4178 | |
4179 | return rc; | |
4180 | } | |
4181 | ||
07feee8f PM |
4182 | /** |
4183 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4184 | * @sk: the new socket | |
4185 | * @req: the connection's request_sock | |
4186 | * | |
4187 | * Transfer the connection's peer label to the newly created socket. | |
4188 | */ | |
4189 | static void smack_inet_csk_clone(struct sock *sk, | |
4190 | const struct request_sock *req) | |
4191 | { | |
4192 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4193 | struct smack_known *skp; |
07feee8f | 4194 | |
2f823ff8 CS |
4195 | if (req->peer_secid != 0) { |
4196 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4197 | ssp->smk_packet = skp; |
2f823ff8 | 4198 | } else |
272cd7a8 | 4199 | ssp->smk_packet = NULL; |
07feee8f PM |
4200 | } |
4201 | ||
e114e473 CS |
4202 | /* |
4203 | * Key management security hooks | |
4204 | * | |
4205 | * Casey has not tested key support very heavily. | |
4206 | * The permission check is most likely too restrictive. | |
4207 | * If you care about keys please have a look. | |
4208 | */ | |
4209 | #ifdef CONFIG_KEYS | |
4210 | ||
4211 | /** | |
4212 | * smack_key_alloc - Set the key security blob | |
4213 | * @key: object | |
d84f4f99 | 4214 | * @cred: the credentials to use |
e114e473 CS |
4215 | * @flags: unused |
4216 | * | |
4217 | * No allocation required | |
4218 | * | |
4219 | * Returns 0 | |
4220 | */ | |
d84f4f99 | 4221 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4222 | unsigned long flags) |
4223 | { | |
2f823ff8 CS |
4224 | struct smack_known *skp = smk_of_task(cred->security); |
4225 | ||
21c7eae2 | 4226 | key->security = skp; |
e114e473 CS |
4227 | return 0; |
4228 | } | |
4229 | ||
4230 | /** | |
4231 | * smack_key_free - Clear the key security blob | |
4232 | * @key: the object | |
4233 | * | |
4234 | * Clear the blob pointer | |
4235 | */ | |
4236 | static void smack_key_free(struct key *key) | |
4237 | { | |
4238 | key->security = NULL; | |
4239 | } | |
4240 | ||
1a28979b | 4241 | /** |
e114e473 CS |
4242 | * smack_key_permission - Smack access on a key |
4243 | * @key_ref: gets to the object | |
d84f4f99 | 4244 | * @cred: the credentials to use |
1a28979b | 4245 | * @perm: requested key permissions |
e114e473 CS |
4246 | * |
4247 | * Return 0 if the task has read and write to the object, | |
4248 | * an error code otherwise | |
4249 | */ | |
4250 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4251 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4252 | { |
4253 | struct key *keyp; | |
ecfcc53f | 4254 | struct smk_audit_info ad; |
2f823ff8 | 4255 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4256 | int request = 0; |
d166c802 | 4257 | int rc; |
e114e473 CS |
4258 | |
4259 | keyp = key_ref_to_ptr(key_ref); | |
4260 | if (keyp == NULL) | |
4261 | return -EINVAL; | |
4262 | /* | |
4263 | * If the key hasn't been initialized give it access so that | |
4264 | * it may do so. | |
4265 | */ | |
4266 | if (keyp->security == NULL) | |
4267 | return 0; | |
4268 | /* | |
4269 | * This should not occur | |
4270 | */ | |
2f823ff8 | 4271 | if (tkp == NULL) |
e114e473 | 4272 | return -EACCES; |
ecfcc53f EB |
4273 | #ifdef CONFIG_AUDIT |
4274 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4275 | ad.a.u.key_struct.key = keyp->serial; | |
4276 | ad.a.u.key_struct.key_desc = keyp->description; | |
4277 | #endif | |
fffea214 DK |
4278 | if (perm & KEY_NEED_READ) |
4279 | request = MAY_READ; | |
4280 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4281 | request = MAY_WRITE; | |
d166c802 CS |
4282 | rc = smk_access(tkp, keyp->security, request, &ad); |
4283 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4284 | return rc; | |
e114e473 | 4285 | } |
7fc5f36e JB |
4286 | |
4287 | /* | |
4288 | * smack_key_getsecurity - Smack label tagging the key | |
4289 | * @key points to the key to be queried | |
4290 | * @_buffer points to a pointer that should be set to point to the | |
4291 | * resulting string (if no label or an error occurs). | |
4292 | * Return the length of the string (including terminating NUL) or -ve if | |
4293 | * an error. | |
4294 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4295 | */ | |
4296 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4297 | { | |
4298 | struct smack_known *skp = key->security; | |
4299 | size_t length; | |
4300 | char *copy; | |
4301 | ||
4302 | if (key->security == NULL) { | |
4303 | *_buffer = NULL; | |
4304 | return 0; | |
4305 | } | |
4306 | ||
4307 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4308 | if (copy == NULL) | |
4309 | return -ENOMEM; | |
4310 | length = strlen(copy) + 1; | |
4311 | ||
4312 | *_buffer = copy; | |
4313 | return length; | |
4314 | } | |
4315 | ||
e114e473 CS |
4316 | #endif /* CONFIG_KEYS */ |
4317 | ||
d20bdda6 AD |
4318 | /* |
4319 | * Smack Audit hooks | |
4320 | * | |
4321 | * Audit requires a unique representation of each Smack specific | |
4322 | * rule. This unique representation is used to distinguish the | |
4323 | * object to be audited from remaining kernel objects and also | |
4324 | * works as a glue between the audit hooks. | |
4325 | * | |
4326 | * Since repository entries are added but never deleted, we'll use | |
4327 | * the smack_known label address related to the given audit rule as | |
4328 | * the needed unique representation. This also better fits the smack | |
4329 | * model where nearly everything is a label. | |
4330 | */ | |
4331 | #ifdef CONFIG_AUDIT | |
4332 | ||
4333 | /** | |
4334 | * smack_audit_rule_init - Initialize a smack audit rule | |
4335 | * @field: audit rule fields given from user-space (audit.h) | |
4336 | * @op: required testing operator (=, !=, >, <, ...) | |
4337 | * @rulestr: smack label to be audited | |
4338 | * @vrule: pointer to save our own audit rule representation | |
4339 | * | |
4340 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4341 | * The label to be audited is created if necessay. | |
4342 | */ | |
4343 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4344 | { | |
21c7eae2 | 4345 | struct smack_known *skp; |
d20bdda6 AD |
4346 | char **rule = (char **)vrule; |
4347 | *rule = NULL; | |
4348 | ||
4349 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4350 | return -EINVAL; | |
4351 | ||
5af75d8d | 4352 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4353 | return -EINVAL; |
4354 | ||
21c7eae2 | 4355 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4356 | if (IS_ERR(skp)) |
4357 | return PTR_ERR(skp); | |
4358 | ||
4359 | *rule = skp->smk_known; | |
d20bdda6 AD |
4360 | |
4361 | return 0; | |
4362 | } | |
4363 | ||
4364 | /** | |
4365 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4366 | * @krule: rule of interest, in Audit kernel representation format | |
4367 | * | |
4368 | * This is used to filter Smack rules from remaining Audit ones. | |
4369 | * If it's proved that this rule belongs to us, the | |
4370 | * audit_rule_match hook will be called to do the final judgement. | |
4371 | */ | |
4372 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4373 | { | |
4374 | struct audit_field *f; | |
4375 | int i; | |
4376 | ||
4377 | for (i = 0; i < krule->field_count; i++) { | |
4378 | f = &krule->fields[i]; | |
4379 | ||
4380 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4381 | return 1; | |
4382 | } | |
4383 | ||
4384 | return 0; | |
4385 | } | |
4386 | ||
4387 | /** | |
4388 | * smack_audit_rule_match - Audit given object ? | |
4389 | * @secid: security id for identifying the object to test | |
4390 | * @field: audit rule flags given from user-space | |
4391 | * @op: required testing operator | |
4392 | * @vrule: smack internal rule presentation | |
4393 | * @actx: audit context associated with the check | |
4394 | * | |
4395 | * The core Audit hook. It's used to take the decision of | |
4396 | * whether to audit or not to audit a given object. | |
4397 | */ | |
4398 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4399 | struct audit_context *actx) | |
4400 | { | |
2f823ff8 | 4401 | struct smack_known *skp; |
d20bdda6 AD |
4402 | char *rule = vrule; |
4403 | ||
4eb0f4ab RGB |
4404 | if (unlikely(!rule)) { |
4405 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4406 | return -ENOENT; |
4407 | } | |
4408 | ||
4409 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4410 | return 0; | |
4411 | ||
2f823ff8 | 4412 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4413 | |
4414 | /* | |
4415 | * No need to do string comparisons. If a match occurs, | |
4416 | * both pointers will point to the same smack_known | |
4417 | * label. | |
4418 | */ | |
5af75d8d | 4419 | if (op == Audit_equal) |
2f823ff8 | 4420 | return (rule == skp->smk_known); |
5af75d8d | 4421 | if (op == Audit_not_equal) |
2f823ff8 | 4422 | return (rule != skp->smk_known); |
d20bdda6 AD |
4423 | |
4424 | return 0; | |
4425 | } | |
4426 | ||
4427 | /** | |
4428 | * smack_audit_rule_free - free smack rule representation | |
4429 | * @vrule: rule to be freed. | |
4430 | * | |
4431 | * No memory was allocated. | |
4432 | */ | |
4433 | static void smack_audit_rule_free(void *vrule) | |
4434 | { | |
4435 | /* No-op */ | |
4436 | } | |
4437 | ||
4438 | #endif /* CONFIG_AUDIT */ | |
4439 | ||
746df9b5 DQ |
4440 | /** |
4441 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4442 | * @name: Full xattr name to check. | |
4443 | */ | |
4444 | static int smack_ismaclabel(const char *name) | |
4445 | { | |
4446 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4447 | } | |
4448 | ||
4449 | ||
251a2a95 | 4450 | /** |
e114e473 CS |
4451 | * smack_secid_to_secctx - return the smack label for a secid |
4452 | * @secid: incoming integer | |
4453 | * @secdata: destination | |
4454 | * @seclen: how long it is | |
4455 | * | |
4456 | * Exists for networking code. | |
4457 | */ | |
4458 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4459 | { | |
2f823ff8 | 4460 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4461 | |
d5630b9d | 4462 | if (secdata) |
2f823ff8 CS |
4463 | *secdata = skp->smk_known; |
4464 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4465 | return 0; |
4466 | } | |
4467 | ||
251a2a95 | 4468 | /** |
4bc87e62 CS |
4469 | * smack_secctx_to_secid - return the secid for a smack label |
4470 | * @secdata: smack label | |
4471 | * @seclen: how long result is | |
4472 | * @secid: outgoing integer | |
4473 | * | |
4474 | * Exists for audit and networking code. | |
4475 | */ | |
e52c1764 | 4476 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4477 | { |
21c7eae2 LP |
4478 | struct smack_known *skp = smk_find_entry(secdata); |
4479 | ||
4480 | if (skp) | |
4481 | *secid = skp->smk_secid; | |
4482 | else | |
4483 | *secid = 0; | |
4bc87e62 CS |
4484 | return 0; |
4485 | } | |
4486 | ||
251a2a95 | 4487 | /** |
e114e473 | 4488 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
4489 | * @secdata: unused |
4490 | * @seclen: unused | |
e114e473 CS |
4491 | * |
4492 | * Exists to make sure nothing gets done, and properly | |
4493 | */ | |
4494 | static void smack_release_secctx(char *secdata, u32 seclen) | |
4495 | { | |
4496 | } | |
4497 | ||
1ee65e37 DQ |
4498 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4499 | { | |
4500 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4501 | } | |
4502 | ||
4503 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4504 | { | |
4505 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4506 | } | |
4507 | ||
4508 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4509 | { | |
4510 | int len = 0; | |
4511 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4512 | ||
4513 | if (len < 0) | |
4514 | return len; | |
4515 | *ctxlen = len; | |
4516 | return 0; | |
4517 | } | |
4518 | ||
1eddfe8e | 4519 | static struct security_hook_list smack_hooks[] = { |
e20b043a CS |
4520 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4521 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4522 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4523 | ||
4524 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4525 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
4526 | LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data), | |
4527 | LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount), | |
4528 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), | |
3bf2789c VT |
4529 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
4530 | LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str), | |
e20b043a CS |
4531 | |
4532 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
4533 | LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds), | |
4534 | LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec), | |
4535 | ||
4536 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4537 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4538 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4539 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4540 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4541 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4542 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4543 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4544 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4545 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4546 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4547 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4548 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4549 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4550 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4551 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4552 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4553 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4554 | ||
4555 | LSM_HOOK_INIT(file_permission, smack_file_permission), | |
4556 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), | |
4557 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4558 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4559 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4560 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4561 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4562 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4563 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4564 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4565 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4566 | ||
4567 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4568 | ||
4569 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4570 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4571 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4572 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
4573 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), | |
4574 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4575 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4576 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4577 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4578 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4579 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4580 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4581 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4582 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4583 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4584 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4585 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
4586 | LSM_HOOK_INIT(task_wait, smack_task_wait), | |
4587 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), | |
4588 | ||
4589 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4590 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4591 | ||
4592 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4593 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4594 | ||
4595 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security), | |
4596 | LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security), | |
4597 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), | |
4598 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4599 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4600 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4601 | ||
4602 | LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security), | |
4603 | LSM_HOOK_INIT(shm_free_security, smack_shm_free_security), | |
4604 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), | |
4605 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4606 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4607 | ||
4608 | LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security), | |
4609 | LSM_HOOK_INIT(sem_free_security, smack_sem_free_security), | |
4610 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), | |
4611 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4612 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4613 | ||
4614 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4615 | ||
4616 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4617 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4618 | ||
4619 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4620 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4621 | ||
4622 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
21abb1ec | 4623 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4624 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4625 | #endif |
e20b043a CS |
4626 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4627 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4628 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4629 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4630 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4631 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4632 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4633 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4634 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4635 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4636 | |
e114e473 CS |
4637 | /* key management security hooks */ |
4638 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4639 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4640 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4641 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4642 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4643 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4644 | |
4645 | /* Audit hooks */ | |
4646 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4647 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4648 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4649 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
4650 | LSM_HOOK_INIT(audit_rule_free, smack_audit_rule_free), | |
d20bdda6 AD |
4651 | #endif /* CONFIG_AUDIT */ |
4652 | ||
e20b043a CS |
4653 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4654 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4655 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
4656 | LSM_HOOK_INIT(release_secctx, smack_release_secctx), | |
4657 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), | |
4658 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4659 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
e114e473 CS |
4660 | }; |
4661 | ||
7198e2ee | 4662 | |
86812bb0 | 4663 | static __init void init_smack_known_list(void) |
7198e2ee | 4664 | { |
86812bb0 CS |
4665 | /* |
4666 | * Initialize rule list locks | |
4667 | */ | |
4668 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4669 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4670 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4671 | mutex_init(&smack_known_star.smk_rules_lock); | |
4672 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4673 | mutex_init(&smack_known_web.smk_rules_lock); | |
4674 | /* | |
4675 | * Initialize rule lists | |
4676 | */ | |
4677 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4678 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4679 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4680 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4681 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4682 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4683 | /* | |
4684 | * Create the known labels list | |
4685 | */ | |
4d7cf4a1 TS |
4686 | smk_insert_entry(&smack_known_huh); |
4687 | smk_insert_entry(&smack_known_hat); | |
4688 | smk_insert_entry(&smack_known_star); | |
4689 | smk_insert_entry(&smack_known_floor); | |
4690 | smk_insert_entry(&smack_known_invalid); | |
4691 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4692 | } |
4693 | ||
e114e473 CS |
4694 | /** |
4695 | * smack_init - initialize the smack system | |
4696 | * | |
4697 | * Returns 0 | |
4698 | */ | |
4699 | static __init int smack_init(void) | |
4700 | { | |
d84f4f99 | 4701 | struct cred *cred; |
676dac4b | 4702 | struct task_smack *tsp; |
d84f4f99 | 4703 | |
b1d9e6b0 | 4704 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4705 | return 0; |
4706 | ||
69f287ae CS |
4707 | smack_enabled = 1; |
4708 | ||
1a5b472b R |
4709 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4710 | if (!smack_inode_cache) | |
4711 | return -ENOMEM; | |
4712 | ||
2f823ff8 CS |
4713 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4714 | GFP_KERNEL); | |
1a5b472b R |
4715 | if (tsp == NULL) { |
4716 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4717 | return -ENOMEM; |
1a5b472b | 4718 | } |
676dac4b | 4719 | |
21abb1ec CS |
4720 | pr_info("Smack: Initializing.\n"); |
4721 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4722 | pr_info("Smack: Netfilter enabled.\n"); | |
4723 | #endif | |
4724 | #ifdef SMACK_IPV6_PORT_LABELING | |
4725 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4726 | #endif | |
4727 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4728 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4729 | #endif | |
e114e473 CS |
4730 | |
4731 | /* | |
4732 | * Set the security state for the initial task. | |
4733 | */ | |
d84f4f99 | 4734 | cred = (struct cred *) current->cred; |
676dac4b | 4735 | cred->security = tsp; |
e114e473 | 4736 | |
86812bb0 CS |
4737 | /* initialize the smack_known_list */ |
4738 | init_smack_known_list(); | |
e114e473 CS |
4739 | |
4740 | /* | |
4741 | * Register with LSM | |
4742 | */ | |
b1d9e6b0 | 4743 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks)); |
e114e473 CS |
4744 | |
4745 | return 0; | |
4746 | } | |
4747 | ||
4748 | /* | |
4749 | * Smack requires early initialization in order to label | |
4750 | * all processes and objects when they are created. | |
4751 | */ | |
4752 | security_initcall(smack_init); |