Commit | Line | Data |
---|---|---|
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> | |
e114e473 CS |
44 | #include "smack.h" |
45 | ||
5c6d1125 JS |
46 | #define TRANS_TRUE "TRUE" |
47 | #define TRANS_TRUE_SIZE 4 | |
48 | ||
c6739443 CS |
49 | #define SMK_CONNECTING 0 |
50 | #define SMK_RECEIVING 1 | |
51 | #define SMK_SENDING 2 | |
52 | ||
69f287ae | 53 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
c6739443 | 54 | LIST_HEAD(smk_ipv6_port_list); |
69f287ae | 55 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
1a5b472b | 56 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 57 | int smack_enabled; |
c6739443 | 58 | |
d166c802 | 59 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
bf4b2fee CS |
60 | static char *smk_bu_mess[] = { |
61 | "Bringup Error", /* Unused */ | |
62 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
63 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
64 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
65 | }; | |
66 | ||
d166c802 CS |
67 | static void smk_bu_mode(int mode, char *s) |
68 | { | |
69 | int i = 0; | |
70 | ||
71 | if (mode & MAY_READ) | |
72 | s[i++] = 'r'; | |
73 | if (mode & MAY_WRITE) | |
74 | s[i++] = 'w'; | |
75 | if (mode & MAY_EXEC) | |
76 | s[i++] = 'x'; | |
77 | if (mode & MAY_APPEND) | |
78 | s[i++] = 'a'; | |
79 | if (mode & MAY_TRANSMUTE) | |
80 | s[i++] = 't'; | |
81 | if (mode & MAY_LOCK) | |
82 | s[i++] = 'l'; | |
83 | if (i == 0) | |
84 | s[i++] = '-'; | |
85 | s[i] = '\0'; | |
86 | } | |
87 | #endif | |
88 | ||
89 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
90 | static int smk_bu_note(char *note, struct smack_known *sskp, |
91 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
92 | { |
93 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
94 | ||
95 | if (rc <= 0) | |
96 | return rc; | |
bf4b2fee CS |
97 | if (rc > SMACK_UNCONFINED_OBJECT) |
98 | rc = 0; | |
d166c802 CS |
99 | |
100 | smk_bu_mode(mode, acc); | |
bf4b2fee | 101 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 102 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
103 | return 0; |
104 | } | |
105 | #else | |
21c7eae2 | 106 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
107 | #endif |
108 | ||
109 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
110 | static int smk_bu_current(char *note, struct smack_known *oskp, |
111 | int mode, int rc) | |
d166c802 CS |
112 | { |
113 | struct task_smack *tsp = current_security(); | |
114 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
115 | ||
116 | if (rc <= 0) | |
117 | return rc; | |
bf4b2fee CS |
118 | if (rc > SMACK_UNCONFINED_OBJECT) |
119 | rc = 0; | |
d166c802 CS |
120 | |
121 | smk_bu_mode(mode, acc); | |
bf4b2fee | 122 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
123 | tsp->smk_task->smk_known, oskp->smk_known, |
124 | acc, current->comm, note); | |
d166c802 CS |
125 | return 0; |
126 | } | |
127 | #else | |
21c7eae2 | 128 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
129 | #endif |
130 | ||
131 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
132 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
133 | { | |
134 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 135 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
136 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
137 | ||
138 | if (rc <= 0) | |
139 | return rc; | |
bf4b2fee CS |
140 | if (rc > SMACK_UNCONFINED_OBJECT) |
141 | rc = 0; | |
d166c802 CS |
142 | |
143 | smk_bu_mode(mode, acc); | |
bf4b2fee | 144 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 145 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
146 | current->comm, otp->comm); |
147 | return 0; | |
148 | } | |
149 | #else | |
150 | #define smk_bu_task(otp, mode, RC) (RC) | |
151 | #endif | |
152 | ||
153 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
154 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
155 | { | |
156 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 157 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
158 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
159 | ||
bf4b2fee CS |
160 | if (isp->smk_flags & SMK_INODE_IMPURE) |
161 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
162 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
163 | ||
d166c802 CS |
164 | if (rc <= 0) |
165 | return rc; | |
bf4b2fee CS |
166 | if (rc > SMACK_UNCONFINED_OBJECT) |
167 | rc = 0; | |
168 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
169 | (mode & (MAY_WRITE | MAY_APPEND))) | |
170 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
171 | |
172 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
173 | |
174 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
175 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
176 | inode->i_sb->s_id, inode->i_ino, current->comm); |
177 | return 0; | |
178 | } | |
179 | #else | |
180 | #define smk_bu_inode(inode, mode, RC) (RC) | |
181 | #endif | |
182 | ||
183 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
184 | static int smk_bu_file(struct file *file, int mode, int rc) | |
185 | { | |
186 | struct task_smack *tsp = current_security(); | |
187 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 188 | struct inode *inode = file_inode(file); |
bf4b2fee | 189 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
190 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
191 | ||
bf4b2fee CS |
192 | if (isp->smk_flags & SMK_INODE_IMPURE) |
193 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
194 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
195 | ||
d166c802 CS |
196 | if (rc <= 0) |
197 | return rc; | |
bf4b2fee CS |
198 | if (rc > SMACK_UNCONFINED_OBJECT) |
199 | rc = 0; | |
d166c802 CS |
200 | |
201 | smk_bu_mode(mode, acc); | |
bf4b2fee | 202 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 203 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 204 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
205 | current->comm); |
206 | return 0; | |
207 | } | |
208 | #else | |
209 | #define smk_bu_file(file, mode, RC) (RC) | |
210 | #endif | |
211 | ||
212 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
213 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
214 | int mode, int rc) | |
215 | { | |
216 | struct task_smack *tsp = cred->security; | |
217 | struct smack_known *sskp = tsp->smk_task; | |
218 | struct inode *inode = file->f_inode; | |
bf4b2fee | 219 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
220 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
221 | ||
bf4b2fee CS |
222 | if (isp->smk_flags & SMK_INODE_IMPURE) |
223 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
224 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
225 | ||
d166c802 CS |
226 | if (rc <= 0) |
227 | return rc; | |
bf4b2fee CS |
228 | if (rc > SMACK_UNCONFINED_OBJECT) |
229 | rc = 0; | |
d166c802 CS |
230 | |
231 | smk_bu_mode(mode, acc); | |
bf4b2fee | 232 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 233 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 234 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
235 | current->comm); |
236 | return 0; | |
237 | } | |
238 | #else | |
239 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
240 | #endif | |
241 | ||
e114e473 CS |
242 | /** |
243 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 244 | * @name: type of the label (attribute) |
e114e473 CS |
245 | * @ip: a pointer to the inode |
246 | * @dp: a pointer to the dentry | |
247 | * | |
e774ad68 LP |
248 | * Returns a pointer to the master list entry for the Smack label, |
249 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 250 | */ |
2f823ff8 CS |
251 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
252 | struct dentry *dp) | |
e114e473 CS |
253 | { |
254 | int rc; | |
f7112e6c | 255 | char *buffer; |
2f823ff8 | 256 | struct smack_known *skp = NULL; |
e114e473 CS |
257 | |
258 | if (ip->i_op->getxattr == NULL) | |
e774ad68 | 259 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 260 | |
f7112e6c CS |
261 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
262 | if (buffer == NULL) | |
e774ad68 | 263 | return ERR_PTR(-ENOMEM); |
e114e473 | 264 | |
f7112e6c | 265 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
266 | if (rc < 0) |
267 | skp = ERR_PTR(rc); | |
268 | else if (rc == 0) | |
269 | skp = NULL; | |
270 | else | |
2f823ff8 | 271 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
272 | |
273 | kfree(buffer); | |
274 | ||
2f823ff8 | 275 | return skp; |
e114e473 CS |
276 | } |
277 | ||
278 | /** | |
279 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 280 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
281 | * |
282 | * Returns the new blob or NULL if there's no memory available | |
283 | */ | |
21c7eae2 | 284 | struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
285 | { |
286 | struct inode_smack *isp; | |
287 | ||
1a5b472b | 288 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
289 | if (isp == NULL) |
290 | return NULL; | |
291 | ||
21c7eae2 | 292 | isp->smk_inode = skp; |
e114e473 CS |
293 | isp->smk_flags = 0; |
294 | mutex_init(&isp->smk_lock); | |
295 | ||
296 | return isp; | |
297 | } | |
298 | ||
7898e1f8 CS |
299 | /** |
300 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
301 | * @task: a pointer to the Smack label for the running task |
302 | * @forked: a pointer to the Smack label for the forked task | |
303 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
304 | * |
305 | * Returns the new blob or NULL if there's no memory available | |
306 | */ | |
2f823ff8 CS |
307 | static struct task_smack *new_task_smack(struct smack_known *task, |
308 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
309 | { |
310 | struct task_smack *tsp; | |
311 | ||
312 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
313 | if (tsp == NULL) | |
314 | return NULL; | |
315 | ||
316 | tsp->smk_task = task; | |
317 | tsp->smk_forked = forked; | |
318 | INIT_LIST_HEAD(&tsp->smk_rules); | |
319 | mutex_init(&tsp->smk_rules_lock); | |
320 | ||
321 | return tsp; | |
322 | } | |
323 | ||
324 | /** | |
325 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
326 | * @nhead: new rules header pointer |
327 | * @ohead: old rules header pointer | |
328 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
329 | * |
330 | * Returns 0 on success, -ENOMEM on error | |
331 | */ | |
332 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
333 | gfp_t gfp) | |
334 | { | |
335 | struct smack_rule *nrp; | |
336 | struct smack_rule *orp; | |
337 | int rc = 0; | |
338 | ||
339 | INIT_LIST_HEAD(nhead); | |
340 | ||
341 | list_for_each_entry_rcu(orp, ohead, list) { | |
342 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
343 | if (nrp == NULL) { | |
344 | rc = -ENOMEM; | |
345 | break; | |
346 | } | |
347 | *nrp = *orp; | |
348 | list_add_rcu(&nrp->list, nhead); | |
349 | } | |
350 | return rc; | |
351 | } | |
352 | ||
5663884c LP |
353 | /** |
354 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
355 | * @mode - input mode in form of PTRACE_MODE_* | |
356 | * | |
357 | * Returns a converted MAY_* mode usable by smack rules | |
358 | */ | |
359 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
360 | { | |
361 | switch (mode) { | |
362 | case PTRACE_MODE_READ: | |
363 | return MAY_READ; | |
364 | case PTRACE_MODE_ATTACH: | |
365 | return MAY_READWRITE; | |
366 | } | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | /** | |
372 | * smk_ptrace_rule_check - helper for ptrace access | |
373 | * @tracer: tracer process | |
21c7eae2 | 374 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
375 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
376 | * @func: name of the function that called us, used for audit | |
377 | * | |
378 | * Returns 0 on access granted, -error on error | |
379 | */ | |
21c7eae2 LP |
380 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
381 | struct smack_known *tracee_known, | |
5663884c LP |
382 | unsigned int mode, const char *func) |
383 | { | |
384 | int rc; | |
385 | struct smk_audit_info ad, *saip = NULL; | |
386 | struct task_smack *tsp; | |
21c7eae2 | 387 | struct smack_known *tracer_known; |
5663884c LP |
388 | |
389 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
390 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
391 | smk_ad_setfield_u_tsk(&ad, tracer); | |
392 | saip = &ad; | |
393 | } | |
394 | ||
6d1cff2a AR |
395 | rcu_read_lock(); |
396 | tsp = __task_cred(tracer)->security; | |
21c7eae2 | 397 | tracer_known = smk_of_task(tsp); |
5663884c | 398 | |
66867818 LP |
399 | if ((mode & PTRACE_MODE_ATTACH) && |
400 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
401 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 402 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
403 | rc = 0; |
404 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
405 | rc = -EACCES; | |
406 | else if (capable(CAP_SYS_PTRACE)) | |
407 | rc = 0; | |
408 | else | |
409 | rc = -EACCES; | |
410 | ||
411 | if (saip) | |
21c7eae2 LP |
412 | smack_log(tracer_known->smk_known, |
413 | tracee_known->smk_known, | |
414 | 0, rc, saip); | |
66867818 | 415 | |
6d1cff2a | 416 | rcu_read_unlock(); |
66867818 LP |
417 | return rc; |
418 | } | |
419 | ||
420 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 421 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
422 | |
423 | rcu_read_unlock(); | |
5663884c LP |
424 | return rc; |
425 | } | |
426 | ||
e114e473 CS |
427 | /* |
428 | * LSM hooks. | |
429 | * We he, that is fun! | |
430 | */ | |
431 | ||
432 | /** | |
9e48858f | 433 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 434 | * @ctp: child task pointer |
5663884c | 435 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
436 | * |
437 | * Returns 0 if access is OK, an error code otherwise | |
438 | * | |
5663884c | 439 | * Do the capability checks. |
e114e473 | 440 | */ |
9e48858f | 441 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 442 | { |
2f823ff8 | 443 | struct smack_known *skp; |
e114e473 | 444 | |
6d1cff2a | 445 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 446 | |
b1d9e6b0 | 447 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
448 | } |
449 | ||
450 | /** | |
451 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
452 | * @ptp: parent task pointer | |
453 | * | |
454 | * Returns 0 if access is OK, an error code otherwise | |
455 | * | |
5663884c | 456 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
457 | */ |
458 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
459 | { | |
460 | int rc; | |
2f823ff8 | 461 | struct smack_known *skp; |
5cd9c58f | 462 | |
959e6c7f | 463 | skp = smk_of_task(current_security()); |
ecfcc53f | 464 | |
21c7eae2 | 465 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
466 | return rc; |
467 | } | |
468 | ||
469 | /** | |
470 | * smack_syslog - Smack approval on syslog | |
471 | * @type: message type | |
472 | * | |
e114e473 CS |
473 | * Returns 0 on success, error code otherwise. |
474 | */ | |
12b3052c | 475 | static int smack_syslog(int typefrom_file) |
e114e473 | 476 | { |
12b3052c | 477 | int rc = 0; |
2f823ff8 | 478 | struct smack_known *skp = smk_of_current(); |
e114e473 | 479 | |
1880eff7 | 480 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
481 | return 0; |
482 | ||
24ea1b6e | 483 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
484 | rc = -EACCES; |
485 | ||
486 | return rc; | |
487 | } | |
488 | ||
489 | ||
490 | /* | |
491 | * Superblock Hooks. | |
492 | */ | |
493 | ||
494 | /** | |
495 | * smack_sb_alloc_security - allocate a superblock blob | |
496 | * @sb: the superblock getting the blob | |
497 | * | |
498 | * Returns 0 on success or -ENOMEM on error. | |
499 | */ | |
500 | static int smack_sb_alloc_security(struct super_block *sb) | |
501 | { | |
502 | struct superblock_smack *sbsp; | |
503 | ||
504 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
505 | ||
506 | if (sbsp == NULL) | |
507 | return -ENOMEM; | |
508 | ||
21c7eae2 LP |
509 | sbsp->smk_root = &smack_known_floor; |
510 | sbsp->smk_default = &smack_known_floor; | |
511 | sbsp->smk_floor = &smack_known_floor; | |
512 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 CS |
513 | /* |
514 | * smk_initialized will be zero from kzalloc. | |
515 | */ | |
e114e473 CS |
516 | sb->s_security = sbsp; |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | /** | |
522 | * smack_sb_free_security - free a superblock blob | |
523 | * @sb: the superblock getting the blob | |
524 | * | |
525 | */ | |
526 | static void smack_sb_free_security(struct super_block *sb) | |
527 | { | |
528 | kfree(sb->s_security); | |
529 | sb->s_security = NULL; | |
530 | } | |
531 | ||
532 | /** | |
533 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 534 | * @orig: where to start |
251a2a95 | 535 | * @smackopts: mount options string |
e114e473 CS |
536 | * |
537 | * Returns 0 on success or -ENOMEM on error. | |
538 | * | |
539 | * Copy the Smack specific mount options out of the mount | |
540 | * options list. | |
541 | */ | |
e0007529 | 542 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
543 | { |
544 | char *cp, *commap, *otheropts, *dp; | |
545 | ||
e114e473 CS |
546 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
547 | if (otheropts == NULL) | |
548 | return -ENOMEM; | |
549 | ||
550 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
551 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
552 | dp = smackopts; | |
553 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
554 | dp = smackopts; | |
555 | else if (strstr(cp, SMK_FSHAT) == cp) | |
556 | dp = smackopts; | |
557 | else if (strstr(cp, SMK_FSROOT) == cp) | |
558 | dp = smackopts; | |
e830b394 CS |
559 | else if (strstr(cp, SMK_FSTRANS) == cp) |
560 | dp = smackopts; | |
e114e473 CS |
561 | else |
562 | dp = otheropts; | |
563 | ||
564 | commap = strchr(cp, ','); | |
565 | if (commap != NULL) | |
566 | *commap = '\0'; | |
567 | ||
568 | if (*dp != '\0') | |
569 | strcat(dp, ","); | |
570 | strcat(dp, cp); | |
571 | } | |
572 | ||
573 | strcpy(orig, otheropts); | |
574 | free_page((unsigned long)otheropts); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * smack_sb_kern_mount - Smack specific mount processing | |
581 | * @sb: the file system superblock | |
12204e24 | 582 | * @flags: the mount flags |
e114e473 CS |
583 | * @data: the smack mount options |
584 | * | |
585 | * Returns 0 on success, an error code on failure | |
586 | */ | |
12204e24 | 587 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
588 | { |
589 | struct dentry *root = sb->s_root; | |
c6f493d6 | 590 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
591 | struct superblock_smack *sp = sb->s_security; |
592 | struct inode_smack *isp; | |
24ea1b6e | 593 | struct smack_known *skp; |
e114e473 CS |
594 | char *op; |
595 | char *commap; | |
e830b394 | 596 | int transmute = 0; |
24ea1b6e | 597 | int specified = 0; |
e114e473 | 598 | |
e830b394 | 599 | if (sp->smk_initialized) |
e114e473 | 600 | return 0; |
eb982cb4 | 601 | |
e114e473 | 602 | sp->smk_initialized = 1; |
e114e473 CS |
603 | |
604 | for (op = data; op != NULL; op = commap) { | |
605 | commap = strchr(op, ','); | |
606 | if (commap != NULL) | |
607 | *commap++ = '\0'; | |
608 | ||
609 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
610 | op += strlen(SMK_FSHAT); | |
21c7eae2 | 611 | skp = smk_import_entry(op, 0); |
e774ad68 LP |
612 | if (IS_ERR(skp)) |
613 | return PTR_ERR(skp); | |
614 | sp->smk_hat = skp; | |
615 | specified = 1; | |
616 | ||
e114e473 CS |
617 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
618 | op += strlen(SMK_FSFLOOR); | |
21c7eae2 | 619 | skp = smk_import_entry(op, 0); |
e774ad68 LP |
620 | if (IS_ERR(skp)) |
621 | return PTR_ERR(skp); | |
622 | sp->smk_floor = skp; | |
623 | specified = 1; | |
624 | ||
e114e473 CS |
625 | } else if (strncmp(op, SMK_FSDEFAULT, |
626 | strlen(SMK_FSDEFAULT)) == 0) { | |
627 | op += strlen(SMK_FSDEFAULT); | |
21c7eae2 | 628 | skp = smk_import_entry(op, 0); |
e774ad68 LP |
629 | if (IS_ERR(skp)) |
630 | return PTR_ERR(skp); | |
631 | sp->smk_default = skp; | |
632 | specified = 1; | |
633 | ||
e114e473 CS |
634 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
635 | op += strlen(SMK_FSROOT); | |
21c7eae2 | 636 | skp = smk_import_entry(op, 0); |
e774ad68 LP |
637 | if (IS_ERR(skp)) |
638 | return PTR_ERR(skp); | |
639 | sp->smk_root = skp; | |
640 | specified = 1; | |
641 | ||
e830b394 CS |
642 | } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { |
643 | op += strlen(SMK_FSTRANS); | |
21c7eae2 | 644 | skp = smk_import_entry(op, 0); |
e774ad68 LP |
645 | if (IS_ERR(skp)) |
646 | return PTR_ERR(skp); | |
647 | sp->smk_root = skp; | |
648 | transmute = 1; | |
649 | specified = 1; | |
e114e473 CS |
650 | } |
651 | } | |
652 | ||
24ea1b6e CS |
653 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
654 | /* | |
655 | * Unprivileged mounts don't get to specify Smack values. | |
656 | */ | |
657 | if (specified) | |
658 | return -EPERM; | |
659 | /* | |
660 | * Unprivileged mounts get root and default from the caller. | |
661 | */ | |
662 | skp = smk_of_current(); | |
21c7eae2 LP |
663 | sp->smk_root = skp; |
664 | sp->smk_default = skp; | |
24ea1b6e | 665 | } |
e114e473 CS |
666 | /* |
667 | * Initialize the root inode. | |
668 | */ | |
669 | isp = inode->i_security; | |
55dfc5da JB |
670 | if (isp == NULL) { |
671 | isp = new_inode_smack(sp->smk_root); | |
672 | if (isp == NULL) | |
673 | return -ENOMEM; | |
674 | inode->i_security = isp; | |
e830b394 | 675 | } else |
e114e473 CS |
676 | isp->smk_inode = sp->smk_root; |
677 | ||
e830b394 CS |
678 | if (transmute) |
679 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
680 | ||
e114e473 CS |
681 | return 0; |
682 | } | |
683 | ||
684 | /** | |
685 | * smack_sb_statfs - Smack check on statfs | |
686 | * @dentry: identifies the file system in question | |
687 | * | |
688 | * Returns 0 if current can read the floor of the filesystem, | |
689 | * and error code otherwise | |
690 | */ | |
691 | static int smack_sb_statfs(struct dentry *dentry) | |
692 | { | |
693 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
694 | int rc; |
695 | struct smk_audit_info ad; | |
696 | ||
a269434d | 697 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 698 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 699 | |
ecfcc53f | 700 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 701 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 702 | return rc; |
e114e473 CS |
703 | } |
704 | ||
676dac4b CS |
705 | /* |
706 | * BPRM hooks | |
707 | */ | |
708 | ||
ce8a4321 CS |
709 | /** |
710 | * smack_bprm_set_creds - set creds for exec | |
711 | * @bprm: the exec information | |
712 | * | |
5663884c | 713 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 714 | */ |
676dac4b CS |
715 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
716 | { | |
496ad9aa | 717 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 718 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 719 | struct inode_smack *isp; |
676dac4b CS |
720 | int rc; |
721 | ||
676dac4b CS |
722 | if (bprm->cred_prepared) |
723 | return 0; | |
724 | ||
84088ba2 JS |
725 | isp = inode->i_security; |
726 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
727 | return 0; |
728 | ||
5663884c LP |
729 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
730 | struct task_struct *tracer; | |
731 | rc = 0; | |
732 | ||
733 | rcu_read_lock(); | |
734 | tracer = ptrace_parent(current); | |
735 | if (likely(tracer != NULL)) | |
736 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 737 | isp->smk_task, |
5663884c LP |
738 | PTRACE_MODE_ATTACH, |
739 | __func__); | |
740 | rcu_read_unlock(); | |
741 | ||
742 | if (rc != 0) | |
743 | return rc; | |
744 | } else if (bprm->unsafe) | |
84088ba2 | 745 | return -EPERM; |
676dac4b | 746 | |
84088ba2 JS |
747 | bsp->smk_task = isp->smk_task; |
748 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 749 | |
84088ba2 JS |
750 | return 0; |
751 | } | |
676dac4b | 752 | |
84088ba2 JS |
753 | /** |
754 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
755 | * from bprm. | |
756 | * | |
757 | * @bprm: binprm for exec | |
758 | */ | |
759 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
760 | { | |
761 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 762 | |
84088ba2 JS |
763 | if (bsp->smk_task != bsp->smk_forked) |
764 | current->pdeath_signal = 0; | |
765 | } | |
766 | ||
767 | /** | |
768 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
769 | * @bprm: binprm for exec | |
770 | * | |
771 | * Returns 0 on success. | |
772 | */ | |
773 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
774 | { | |
775 | struct task_smack *tsp = current_security(); | |
84088ba2 | 776 | |
b1d9e6b0 CS |
777 | if (tsp->smk_task != tsp->smk_forked) |
778 | return 1; | |
84088ba2 | 779 | |
b1d9e6b0 | 780 | return 0; |
676dac4b CS |
781 | } |
782 | ||
e114e473 CS |
783 | /* |
784 | * Inode hooks | |
785 | */ | |
786 | ||
787 | /** | |
788 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 789 | * @inode: the inode in need of a blob |
e114e473 CS |
790 | * |
791 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
792 | */ | |
793 | static int smack_inode_alloc_security(struct inode *inode) | |
794 | { | |
2f823ff8 CS |
795 | struct smack_known *skp = smk_of_current(); |
796 | ||
21c7eae2 | 797 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
798 | if (inode->i_security == NULL) |
799 | return -ENOMEM; | |
800 | return 0; | |
801 | } | |
802 | ||
803 | /** | |
804 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 805 | * @inode: the inode with a blob |
e114e473 CS |
806 | * |
807 | * Clears the blob pointer in inode | |
808 | */ | |
809 | static void smack_inode_free_security(struct inode *inode) | |
810 | { | |
1a5b472b | 811 | kmem_cache_free(smack_inode_cache, inode->i_security); |
e114e473 CS |
812 | inode->i_security = NULL; |
813 | } | |
814 | ||
815 | /** | |
816 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
817 | * @inode: the newly created inode |
818 | * @dir: containing directory object | |
2a7dba39 | 819 | * @qstr: unused |
e114e473 CS |
820 | * @name: where to put the attribute name |
821 | * @value: where to put the attribute value | |
822 | * @len: where to put the length of the attribute | |
823 | * | |
824 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
825 | */ | |
826 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 827 | const struct qstr *qstr, const char **name, |
2a7dba39 | 828 | void **value, size_t *len) |
e114e473 | 829 | { |
2267b13a | 830 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 831 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
832 | struct smack_known *isp = smk_of_inode(inode); |
833 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 834 | int may; |
e114e473 | 835 | |
9548906b TH |
836 | if (name) |
837 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 838 | |
68390ccf | 839 | if (value && len) { |
7898e1f8 | 840 | rcu_read_lock(); |
21c7eae2 LP |
841 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
842 | &skp->smk_rules); | |
7898e1f8 | 843 | rcu_read_unlock(); |
5c6d1125 JS |
844 | |
845 | /* | |
846 | * If the access rule allows transmutation and | |
847 | * the directory requests transmutation then | |
848 | * by all means transmute. | |
2267b13a | 849 | * Mark the inode as changed. |
5c6d1125 | 850 | */ |
7898e1f8 | 851 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 852 | smk_inode_transmutable(dir)) { |
5c6d1125 | 853 | isp = dsp; |
2267b13a CS |
854 | issp->smk_flags |= SMK_INODE_CHANGED; |
855 | } | |
5c6d1125 | 856 | |
21c7eae2 | 857 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
858 | if (*value == NULL) |
859 | return -ENOMEM; | |
e114e473 | 860 | |
21c7eae2 | 861 | *len = strlen(isp->smk_known); |
68390ccf | 862 | } |
e114e473 CS |
863 | |
864 | return 0; | |
865 | } | |
866 | ||
867 | /** | |
868 | * smack_inode_link - Smack check on link | |
869 | * @old_dentry: the existing object | |
870 | * @dir: unused | |
871 | * @new_dentry: the new object | |
872 | * | |
873 | * Returns 0 if access is permitted, an error code otherwise | |
874 | */ | |
875 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
876 | struct dentry *new_dentry) | |
877 | { | |
21c7eae2 | 878 | struct smack_known *isp; |
ecfcc53f EB |
879 | struct smk_audit_info ad; |
880 | int rc; | |
881 | ||
a269434d | 882 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 883 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 884 | |
c6f493d6 | 885 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 886 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 887 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 888 | |
8802565b | 889 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 890 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
891 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
892 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 893 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
894 | } |
895 | ||
896 | return rc; | |
897 | } | |
898 | ||
899 | /** | |
900 | * smack_inode_unlink - Smack check on inode deletion | |
901 | * @dir: containing directory object | |
902 | * @dentry: file to unlink | |
903 | * | |
904 | * Returns 0 if current can write the containing directory | |
905 | * and the object, error code otherwise | |
906 | */ | |
907 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
908 | { | |
c6f493d6 | 909 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 910 | struct smk_audit_info ad; |
e114e473 CS |
911 | int rc; |
912 | ||
a269434d | 913 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
914 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
915 | ||
e114e473 CS |
916 | /* |
917 | * You need write access to the thing you're unlinking | |
918 | */ | |
ecfcc53f | 919 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 920 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 921 | if (rc == 0) { |
e114e473 CS |
922 | /* |
923 | * You also need write access to the containing directory | |
924 | */ | |
cdb56b60 | 925 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
926 | smk_ad_setfield_u_fs_inode(&ad, dir); |
927 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 928 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 929 | } |
e114e473 CS |
930 | return rc; |
931 | } | |
932 | ||
933 | /** | |
934 | * smack_inode_rmdir - Smack check on directory deletion | |
935 | * @dir: containing directory object | |
936 | * @dentry: directory to unlink | |
937 | * | |
938 | * Returns 0 if current can write the containing directory | |
939 | * and the directory, error code otherwise | |
940 | */ | |
941 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
942 | { | |
ecfcc53f | 943 | struct smk_audit_info ad; |
e114e473 CS |
944 | int rc; |
945 | ||
a269434d | 946 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
947 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
948 | ||
e114e473 CS |
949 | /* |
950 | * You need write access to the thing you're removing | |
951 | */ | |
c6f493d6 DH |
952 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
953 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 954 | if (rc == 0) { |
e114e473 CS |
955 | /* |
956 | * You also need write access to the containing directory | |
957 | */ | |
cdb56b60 | 958 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
959 | smk_ad_setfield_u_fs_inode(&ad, dir); |
960 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 961 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 962 | } |
e114e473 CS |
963 | |
964 | return rc; | |
965 | } | |
966 | ||
967 | /** | |
968 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
969 | * @old_inode: unused |
970 | * @old_dentry: the old object | |
971 | * @new_inode: unused | |
972 | * @new_dentry: the new object | |
e114e473 CS |
973 | * |
974 | * Read and write access is required on both the old and | |
975 | * new directories. | |
976 | * | |
977 | * Returns 0 if access is permitted, an error code otherwise | |
978 | */ | |
979 | static int smack_inode_rename(struct inode *old_inode, | |
980 | struct dentry *old_dentry, | |
981 | struct inode *new_inode, | |
982 | struct dentry *new_dentry) | |
983 | { | |
984 | int rc; | |
21c7eae2 | 985 | struct smack_known *isp; |
ecfcc53f EB |
986 | struct smk_audit_info ad; |
987 | ||
a269434d | 988 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 989 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 990 | |
c6f493d6 | 991 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 992 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 993 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 994 | |
8802565b | 995 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 996 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
997 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
998 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 999 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1000 | } |
e114e473 CS |
1001 | return rc; |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * smack_inode_permission - Smack version of permission() | |
1006 | * @inode: the inode in question | |
1007 | * @mask: the access requested | |
e114e473 CS |
1008 | * |
1009 | * This is the important Smack hook. | |
1010 | * | |
1011 | * Returns 0 if access is permitted, -EACCES otherwise | |
1012 | */ | |
e74f71eb | 1013 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1014 | { |
ecfcc53f | 1015 | struct smk_audit_info ad; |
e74f71eb | 1016 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1017 | int rc; |
d09ca739 EP |
1018 | |
1019 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1020 | /* |
1021 | * No permission to check. Existence test. Yup, it's there. | |
1022 | */ | |
1023 | if (mask == 0) | |
1024 | return 0; | |
8c9e80ed AK |
1025 | |
1026 | /* May be droppable after audit */ | |
e74f71eb | 1027 | if (no_block) |
8c9e80ed | 1028 | return -ECHILD; |
f48b7399 | 1029 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1030 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1031 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1032 | rc = smk_bu_inode(inode, mask, rc); | |
1033 | return rc; | |
e114e473 CS |
1034 | } |
1035 | ||
1036 | /** | |
1037 | * smack_inode_setattr - Smack check for setting attributes | |
1038 | * @dentry: the object | |
1039 | * @iattr: for the force flag | |
1040 | * | |
1041 | * Returns 0 if access is permitted, an error code otherwise | |
1042 | */ | |
1043 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1044 | { | |
ecfcc53f | 1045 | struct smk_audit_info ad; |
d166c802 CS |
1046 | int rc; |
1047 | ||
e114e473 CS |
1048 | /* |
1049 | * Need to allow for clearing the setuid bit. | |
1050 | */ | |
1051 | if (iattr->ia_valid & ATTR_FORCE) | |
1052 | return 0; | |
a269434d | 1053 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1054 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1055 | |
c6f493d6 DH |
1056 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1057 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1058 | return rc; |
e114e473 CS |
1059 | } |
1060 | ||
1061 | /** | |
1062 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1063 | * @mnt: vfsmount of the object |
e114e473 CS |
1064 | * @dentry: the object |
1065 | * | |
1066 | * Returns 0 if access is permitted, an error code otherwise | |
1067 | */ | |
3f7036a0 | 1068 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1069 | { |
ecfcc53f | 1070 | struct smk_audit_info ad; |
c6f493d6 | 1071 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1072 | int rc; |
ecfcc53f | 1073 | |
f48b7399 | 1074 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1075 | smk_ad_setfield_u_fs_path(&ad, *path); |
1076 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1077 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1078 | return rc; |
e114e473 CS |
1079 | } |
1080 | ||
1081 | /** | |
1082 | * smack_inode_setxattr - Smack check for setting xattrs | |
1083 | * @dentry: the object | |
1084 | * @name: name of the attribute | |
e95ef49b LP |
1085 | * @value: value of the attribute |
1086 | * @size: size of the value | |
e114e473 CS |
1087 | * @flags: unused |
1088 | * | |
1089 | * This protects the Smack attribute explicitly. | |
1090 | * | |
1091 | * Returns 0 if access is permitted, an error code otherwise | |
1092 | */ | |
8f0cfa52 DH |
1093 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1094 | const void *value, size_t size, int flags) | |
e114e473 | 1095 | { |
ecfcc53f | 1096 | struct smk_audit_info ad; |
19760ad0 CS |
1097 | struct smack_known *skp; |
1098 | int check_priv = 0; | |
1099 | int check_import = 0; | |
1100 | int check_star = 0; | |
bcdca225 | 1101 | int rc = 0; |
e114e473 | 1102 | |
19760ad0 CS |
1103 | /* |
1104 | * Check label validity here so import won't fail in post_setxattr | |
1105 | */ | |
bcdca225 CS |
1106 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1107 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1108 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1109 | check_priv = 1; | |
1110 | check_import = 1; | |
1111 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1112 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1113 | check_priv = 1; | |
1114 | check_import = 1; | |
1115 | check_star = 1; | |
5c6d1125 | 1116 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1117 | check_priv = 1; |
5c6d1125 JS |
1118 | if (size != TRANS_TRUE_SIZE || |
1119 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1120 | rc = -EINVAL; | |
bcdca225 CS |
1121 | } else |
1122 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1123 | ||
19760ad0 CS |
1124 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1125 | rc = -EPERM; | |
1126 | ||
1127 | if (rc == 0 && check_import) { | |
b862e561 | 1128 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1129 | if (IS_ERR(skp)) |
1130 | rc = PTR_ERR(skp); | |
1131 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1132 | (skp == &smack_known_star || skp == &smack_known_web))) |
1133 | rc = -EINVAL; | |
1134 | } | |
1135 | ||
a269434d | 1136 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1137 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1138 | ||
d166c802 | 1139 | if (rc == 0) { |
c6f493d6 DH |
1140 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1141 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1142 | } |
bcdca225 CS |
1143 | |
1144 | return rc; | |
e114e473 CS |
1145 | } |
1146 | ||
1147 | /** | |
1148 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1149 | * @dentry: object | |
1150 | * @name: attribute name | |
1151 | * @value: attribute value | |
1152 | * @size: attribute size | |
1153 | * @flags: unused | |
1154 | * | |
1155 | * Set the pointer in the inode blob to the entry found | |
1156 | * in the master label list. | |
1157 | */ | |
8f0cfa52 DH |
1158 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1159 | const void *value, size_t size, int flags) | |
e114e473 | 1160 | { |
2f823ff8 | 1161 | struct smack_known *skp; |
c6f493d6 | 1162 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1163 | |
2f823ff8 CS |
1164 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1165 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1166 | return; | |
1167 | } | |
1168 | ||
676dac4b | 1169 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1170 | skp = smk_import_entry(value, size); |
e774ad68 | 1171 | if (!IS_ERR(skp)) |
21c7eae2 | 1172 | isp->smk_inode = skp; |
676dac4b | 1173 | else |
21c7eae2 | 1174 | isp->smk_inode = &smack_known_invalid; |
5c6d1125 | 1175 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1176 | skp = smk_import_entry(value, size); |
e774ad68 | 1177 | if (!IS_ERR(skp)) |
2f823ff8 | 1178 | isp->smk_task = skp; |
676dac4b | 1179 | else |
2f823ff8 | 1180 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 1181 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1182 | skp = smk_import_entry(value, size); |
e774ad68 | 1183 | if (!IS_ERR(skp)) |
2f823ff8 | 1184 | isp->smk_mmap = skp; |
7898e1f8 | 1185 | else |
2f823ff8 CS |
1186 | isp->smk_mmap = &smack_known_invalid; |
1187 | } | |
e114e473 CS |
1188 | |
1189 | return; | |
1190 | } | |
1191 | ||
ce8a4321 | 1192 | /** |
e114e473 CS |
1193 | * smack_inode_getxattr - Smack check on getxattr |
1194 | * @dentry: the object | |
1195 | * @name: unused | |
1196 | * | |
1197 | * Returns 0 if access is permitted, an error code otherwise | |
1198 | */ | |
8f0cfa52 | 1199 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1200 | { |
ecfcc53f | 1201 | struct smk_audit_info ad; |
d166c802 | 1202 | int rc; |
ecfcc53f | 1203 | |
a269434d | 1204 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1205 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1206 | ||
c6f493d6 DH |
1207 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1208 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1209 | return rc; |
e114e473 CS |
1210 | } |
1211 | ||
ce8a4321 | 1212 | /** |
e114e473 CS |
1213 | * smack_inode_removexattr - Smack check on removexattr |
1214 | * @dentry: the object | |
1215 | * @name: name of the attribute | |
1216 | * | |
1217 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1218 | * | |
1219 | * Returns 0 if access is permitted, an error code otherwise | |
1220 | */ | |
8f0cfa52 | 1221 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1222 | { |
676dac4b | 1223 | struct inode_smack *isp; |
ecfcc53f | 1224 | struct smk_audit_info ad; |
bcdca225 | 1225 | int rc = 0; |
e114e473 | 1226 | |
bcdca225 CS |
1227 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1228 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1229 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1230 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1231 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1232 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1233 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1234 | rc = -EPERM; |
1235 | } else | |
1236 | rc = cap_inode_removexattr(dentry, name); | |
1237 | ||
f59bdfba CS |
1238 | if (rc != 0) |
1239 | return rc; | |
1240 | ||
a269434d | 1241 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1242 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1243 | |
c6f493d6 DH |
1244 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1245 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1246 | if (rc != 0) |
1247 | return rc; | |
1248 | ||
c6f493d6 | 1249 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1250 | /* |
1251 | * Don't do anything special for these. | |
1252 | * XATTR_NAME_SMACKIPIN | |
1253 | * XATTR_NAME_SMACKIPOUT | |
1254 | * XATTR_NAME_SMACKEXEC | |
1255 | */ | |
1256 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
676dac4b | 1257 | isp->smk_task = NULL; |
f59bdfba | 1258 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1259 | isp->smk_mmap = NULL; |
f59bdfba CS |
1260 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1261 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1262 | |
f59bdfba | 1263 | return 0; |
e114e473 CS |
1264 | } |
1265 | ||
1266 | /** | |
1267 | * smack_inode_getsecurity - get smack xattrs | |
1268 | * @inode: the object | |
1269 | * @name: attribute name | |
1270 | * @buffer: where to put the result | |
251a2a95 | 1271 | * @alloc: unused |
e114e473 CS |
1272 | * |
1273 | * Returns the size of the attribute or an error code | |
1274 | */ | |
1275 | static int smack_inode_getsecurity(const struct inode *inode, | |
1276 | const char *name, void **buffer, | |
1277 | bool alloc) | |
1278 | { | |
1279 | struct socket_smack *ssp; | |
1280 | struct socket *sock; | |
1281 | struct super_block *sbp; | |
1282 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1283 | struct smack_known *isp; |
e114e473 CS |
1284 | int ilen; |
1285 | int rc = 0; | |
1286 | ||
1287 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1288 | isp = smk_of_inode(inode); | |
21c7eae2 LP |
1289 | ilen = strlen(isp->smk_known); |
1290 | *buffer = isp->smk_known; | |
e114e473 CS |
1291 | return ilen; |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * The rest of the Smack xattrs are only on sockets. | |
1296 | */ | |
1297 | sbp = ip->i_sb; | |
1298 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1299 | return -EOPNOTSUPP; | |
1300 | ||
1301 | sock = SOCKET_I(ip); | |
2e1d146a | 1302 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1303 | return -EOPNOTSUPP; |
1304 | ||
1305 | ssp = sock->sk->sk_security; | |
1306 | ||
1307 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
21c7eae2 | 1308 | isp = ssp->smk_in; |
e114e473 | 1309 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
21c7eae2 | 1310 | isp = ssp->smk_out; |
e114e473 CS |
1311 | else |
1312 | return -EOPNOTSUPP; | |
1313 | ||
21c7eae2 | 1314 | ilen = strlen(isp->smk_known); |
e114e473 | 1315 | if (rc == 0) { |
21c7eae2 | 1316 | *buffer = isp->smk_known; |
e114e473 CS |
1317 | rc = ilen; |
1318 | } | |
1319 | ||
1320 | return rc; | |
1321 | } | |
1322 | ||
1323 | ||
1324 | /** | |
1325 | * smack_inode_listsecurity - list the Smack attributes | |
1326 | * @inode: the object | |
1327 | * @buffer: where they go | |
1328 | * @buffer_size: size of buffer | |
1329 | * | |
1330 | * Returns 0 on success, -EINVAL otherwise | |
1331 | */ | |
1332 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1333 | size_t buffer_size) | |
1334 | { | |
fd5c9d23 | 1335 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1336 | |
fd5c9d23 | 1337 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1338 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1339 | |
1340 | return len; | |
e114e473 CS |
1341 | } |
1342 | ||
d20bdda6 AD |
1343 | /** |
1344 | * smack_inode_getsecid - Extract inode's security id | |
1345 | * @inode: inode to extract the info from | |
1346 | * @secid: where result will be saved | |
1347 | */ | |
1348 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1349 | { | |
1350 | struct inode_smack *isp = inode->i_security; | |
1351 | ||
21c7eae2 | 1352 | *secid = isp->smk_inode->smk_secid; |
d20bdda6 AD |
1353 | } |
1354 | ||
e114e473 CS |
1355 | /* |
1356 | * File Hooks | |
1357 | */ | |
1358 | ||
1359 | /** | |
1360 | * smack_file_permission - Smack check on file operations | |
1361 | * @file: unused | |
1362 | * @mask: unused | |
1363 | * | |
1364 | * Returns 0 | |
1365 | * | |
1366 | * Should access checks be done on each read or write? | |
1367 | * UNICOS and SELinux say yes. | |
1368 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1369 | * | |
1370 | * I'll say no for now. Smack does not do the frequent | |
1371 | * label changing that SELinux does. | |
1372 | */ | |
1373 | static int smack_file_permission(struct file *file, int mask) | |
1374 | { | |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | /** | |
1379 | * smack_file_alloc_security - assign a file security blob | |
1380 | * @file: the object | |
1381 | * | |
1382 | * The security blob for a file is a pointer to the master | |
1383 | * label list, so no allocation is done. | |
1384 | * | |
5e7270a6 CS |
1385 | * f_security is the owner security information. It |
1386 | * isn't used on file access checks, it's for send_sigio. | |
1387 | * | |
e114e473 CS |
1388 | * Returns 0 |
1389 | */ | |
1390 | static int smack_file_alloc_security(struct file *file) | |
1391 | { | |
2f823ff8 CS |
1392 | struct smack_known *skp = smk_of_current(); |
1393 | ||
21c7eae2 | 1394 | file->f_security = skp; |
e114e473 CS |
1395 | return 0; |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * smack_file_free_security - clear a file security blob | |
1400 | * @file: the object | |
1401 | * | |
1402 | * The security blob for a file is a pointer to the master | |
1403 | * label list, so no memory is freed. | |
1404 | */ | |
1405 | static void smack_file_free_security(struct file *file) | |
1406 | { | |
1407 | file->f_security = NULL; | |
1408 | } | |
1409 | ||
1410 | /** | |
1411 | * smack_file_ioctl - Smack check on ioctls | |
1412 | * @file: the object | |
1413 | * @cmd: what to do | |
1414 | * @arg: unused | |
1415 | * | |
1416 | * Relies heavily on the correct use of the ioctl command conventions. | |
1417 | * | |
1418 | * Returns 0 if allowed, error code otherwise | |
1419 | */ | |
1420 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1421 | unsigned long arg) | |
1422 | { | |
1423 | int rc = 0; | |
ecfcc53f | 1424 | struct smk_audit_info ad; |
5e7270a6 | 1425 | struct inode *inode = file_inode(file); |
ecfcc53f | 1426 | |
f48b7399 | 1427 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1428 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1429 | |
d166c802 | 1430 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1431 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1432 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1433 | } | |
e114e473 | 1434 | |
d166c802 | 1435 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1436 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1437 | rc = smk_bu_file(file, MAY_READ, rc); |
1438 | } | |
e114e473 CS |
1439 | |
1440 | return rc; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * smack_file_lock - Smack check on file locking | |
1445 | * @file: the object | |
251a2a95 | 1446 | * @cmd: unused |
e114e473 | 1447 | * |
c0ab6e56 | 1448 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1449 | */ |
1450 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1451 | { | |
ecfcc53f | 1452 | struct smk_audit_info ad; |
d166c802 | 1453 | int rc; |
5e7270a6 | 1454 | struct inode *inode = file_inode(file); |
ecfcc53f | 1455 | |
92f42509 EP |
1456 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1457 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1458 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1459 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1460 | return rc; | |
e114e473 CS |
1461 | } |
1462 | ||
1463 | /** | |
1464 | * smack_file_fcntl - Smack check on fcntl | |
1465 | * @file: the object | |
1466 | * @cmd: what action to check | |
1467 | * @arg: unused | |
1468 | * | |
531f1d45 CS |
1469 | * Generally these operations are harmless. |
1470 | * File locking operations present an obvious mechanism | |
1471 | * for passing information, so they require write access. | |
1472 | * | |
e114e473 CS |
1473 | * Returns 0 if current has access, error code otherwise |
1474 | */ | |
1475 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1476 | unsigned long arg) | |
1477 | { | |
ecfcc53f | 1478 | struct smk_audit_info ad; |
531f1d45 | 1479 | int rc = 0; |
5e7270a6 | 1480 | struct inode *inode = file_inode(file); |
ecfcc53f | 1481 | |
e114e473 | 1482 | switch (cmd) { |
e114e473 | 1483 | case F_GETLK: |
c0ab6e56 | 1484 | break; |
e114e473 CS |
1485 | case F_SETLK: |
1486 | case F_SETLKW: | |
c0ab6e56 CS |
1487 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1488 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1489 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1490 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1491 | break; |
e114e473 CS |
1492 | case F_SETOWN: |
1493 | case F_SETSIG: | |
531f1d45 CS |
1494 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1495 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1496 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1497 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1498 | break; |
1499 | default: | |
531f1d45 | 1500 | break; |
e114e473 CS |
1501 | } |
1502 | ||
1503 | return rc; | |
1504 | } | |
1505 | ||
7898e1f8 | 1506 | /** |
e5467859 | 1507 | * smack_mmap_file : |
7898e1f8 CS |
1508 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1509 | * if mapping anonymous memory. | |
1510 | * @file contains the file structure for file to map (may be NULL). | |
1511 | * @reqprot contains the protection requested by the application. | |
1512 | * @prot contains the protection that will be applied by the kernel. | |
1513 | * @flags contains the operational flags. | |
1514 | * Return 0 if permission is granted. | |
1515 | */ | |
e5467859 | 1516 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1517 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1518 | unsigned long flags) |
7898e1f8 | 1519 | { |
272cd7a8 | 1520 | struct smack_known *skp; |
2f823ff8 | 1521 | struct smack_known *mkp; |
7898e1f8 CS |
1522 | struct smack_rule *srp; |
1523 | struct task_smack *tsp; | |
21c7eae2 | 1524 | struct smack_known *okp; |
7898e1f8 | 1525 | struct inode_smack *isp; |
0e0a070d CS |
1526 | int may; |
1527 | int mmay; | |
1528 | int tmay; | |
7898e1f8 CS |
1529 | int rc; |
1530 | ||
496ad9aa | 1531 | if (file == NULL) |
7898e1f8 CS |
1532 | return 0; |
1533 | ||
496ad9aa | 1534 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1535 | if (isp->smk_mmap == NULL) |
1536 | return 0; | |
2f823ff8 | 1537 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1538 | |
1539 | tsp = current_security(); | |
2f823ff8 | 1540 | skp = smk_of_current(); |
7898e1f8 CS |
1541 | rc = 0; |
1542 | ||
1543 | rcu_read_lock(); | |
1544 | /* | |
1545 | * For each Smack rule associated with the subject | |
1546 | * label verify that the SMACK64MMAP also has access | |
1547 | * to that rule's object label. | |
7898e1f8 | 1548 | */ |
272cd7a8 | 1549 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1550 | okp = srp->smk_object; |
7898e1f8 CS |
1551 | /* |
1552 | * Matching labels always allows access. | |
1553 | */ | |
21c7eae2 | 1554 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1555 | continue; |
0e0a070d CS |
1556 | /* |
1557 | * If there is a matching local rule take | |
1558 | * that into account as well. | |
1559 | */ | |
21c7eae2 LP |
1560 | may = smk_access_entry(srp->smk_subject->smk_known, |
1561 | okp->smk_known, | |
1562 | &tsp->smk_rules); | |
0e0a070d CS |
1563 | if (may == -ENOENT) |
1564 | may = srp->smk_access; | |
1565 | else | |
1566 | may &= srp->smk_access; | |
1567 | /* | |
1568 | * If may is zero the SMACK64MMAP subject can't | |
1569 | * possibly have less access. | |
1570 | */ | |
1571 | if (may == 0) | |
1572 | continue; | |
1573 | ||
1574 | /* | |
1575 | * Fetch the global list entry. | |
1576 | * If there isn't one a SMACK64MMAP subject | |
1577 | * can't have as much access as current. | |
1578 | */ | |
21c7eae2 LP |
1579 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1580 | &mkp->smk_rules); | |
0e0a070d CS |
1581 | if (mmay == -ENOENT) { |
1582 | rc = -EACCES; | |
1583 | break; | |
1584 | } | |
1585 | /* | |
1586 | * If there is a local entry it modifies the | |
1587 | * potential access, too. | |
1588 | */ | |
21c7eae2 LP |
1589 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1590 | &tsp->smk_rules); | |
0e0a070d CS |
1591 | if (tmay != -ENOENT) |
1592 | mmay &= tmay; | |
7898e1f8 | 1593 | |
0e0a070d CS |
1594 | /* |
1595 | * If there is any access available to current that is | |
1596 | * not available to a SMACK64MMAP subject | |
1597 | * deny access. | |
1598 | */ | |
75a25637 | 1599 | if ((may | mmay) != mmay) { |
0e0a070d | 1600 | rc = -EACCES; |
7898e1f8 | 1601 | break; |
0e0a070d | 1602 | } |
7898e1f8 CS |
1603 | } |
1604 | ||
1605 | rcu_read_unlock(); | |
1606 | ||
1607 | return rc; | |
1608 | } | |
1609 | ||
e114e473 CS |
1610 | /** |
1611 | * smack_file_set_fowner - set the file security blob value | |
1612 | * @file: object in question | |
1613 | * | |
e114e473 | 1614 | */ |
e0b93edd | 1615 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1616 | { |
5e7270a6 | 1617 | file->f_security = smk_of_current(); |
e114e473 CS |
1618 | } |
1619 | ||
1620 | /** | |
1621 | * smack_file_send_sigiotask - Smack on sigio | |
1622 | * @tsk: The target task | |
1623 | * @fown: the object the signal come from | |
1624 | * @signum: unused | |
1625 | * | |
1626 | * Allow a privileged task to get signals even if it shouldn't | |
1627 | * | |
1628 | * Returns 0 if a subject with the object's smack could | |
1629 | * write to the task, an error code otherwise. | |
1630 | */ | |
1631 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1632 | struct fown_struct *fown, int signum) | |
1633 | { | |
2f823ff8 CS |
1634 | struct smack_known *skp; |
1635 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1636 | struct file *file; |
1637 | int rc; | |
ecfcc53f | 1638 | struct smk_audit_info ad; |
e114e473 CS |
1639 | |
1640 | /* | |
1641 | * struct fown_struct is never outside the context of a struct file | |
1642 | */ | |
1643 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1644 | |
ecfcc53f | 1645 | /* we don't log here as rc can be overriden */ |
21c7eae2 LP |
1646 | skp = file->f_security; |
1647 | rc = smk_access(skp, tkp, MAY_WRITE, NULL); | |
1648 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc); | |
5cd9c58f | 1649 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1650 | rc = 0; |
1651 | ||
1652 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1653 | smk_ad_setfield_u_tsk(&ad, tsk); | |
21c7eae2 | 1654 | smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1655 | return rc; |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * smack_file_receive - Smack file receive check | |
1660 | * @file: the object | |
1661 | * | |
1662 | * Returns 0 if current has access, error code otherwise | |
1663 | */ | |
1664 | static int smack_file_receive(struct file *file) | |
1665 | { | |
d166c802 | 1666 | int rc; |
e114e473 | 1667 | int may = 0; |
ecfcc53f | 1668 | struct smk_audit_info ad; |
5e7270a6 | 1669 | struct inode *inode = file_inode(file); |
e114e473 | 1670 | |
9777582e SWK |
1671 | if (unlikely(IS_PRIVATE(inode))) |
1672 | return 0; | |
1673 | ||
4482a44f | 1674 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1675 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1676 | /* |
1677 | * This code relies on bitmasks. | |
1678 | */ | |
1679 | if (file->f_mode & FMODE_READ) | |
1680 | may = MAY_READ; | |
1681 | if (file->f_mode & FMODE_WRITE) | |
1682 | may |= MAY_WRITE; | |
1683 | ||
5e7270a6 | 1684 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1685 | rc = smk_bu_file(file, may, rc); |
1686 | return rc; | |
e114e473 CS |
1687 | } |
1688 | ||
531f1d45 | 1689 | /** |
83d49856 | 1690 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1691 | * @file: the object |
a6834c0b | 1692 | * @cred: task credential |
531f1d45 CS |
1693 | * |
1694 | * Set the security blob in the file structure. | |
a6834c0b CS |
1695 | * Allow the open only if the task has read access. There are |
1696 | * many read operations (e.g. fstat) that you can do with an | |
1697 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1698 | * |
1699 | * Returns 0 | |
1700 | */ | |
83d49856 | 1701 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1702 | { |
a6834c0b | 1703 | struct task_smack *tsp = cred->security; |
5e7270a6 | 1704 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1705 | struct smk_audit_info ad; |
1706 | int rc; | |
531f1d45 | 1707 | |
5e7270a6 | 1708 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
a6834c0b | 1709 | return 0; |
531f1d45 | 1710 | |
a6834c0b CS |
1711 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1712 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1713 | rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad); |
d166c802 | 1714 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1715 | |
1716 | return rc; | |
531f1d45 CS |
1717 | } |
1718 | ||
e114e473 CS |
1719 | /* |
1720 | * Task hooks | |
1721 | */ | |
1722 | ||
ee18d64c DH |
1723 | /** |
1724 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1725 | * @new: the new credentials | |
1726 | * @gfp: the atomicity of any memory allocations | |
1727 | * | |
1728 | * Prepare a blank set of credentials for modification. This must allocate all | |
1729 | * the memory the LSM module might require such that cred_transfer() can | |
1730 | * complete without error. | |
1731 | */ | |
1732 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1733 | { | |
7898e1f8 CS |
1734 | struct task_smack *tsp; |
1735 | ||
1736 | tsp = new_task_smack(NULL, NULL, gfp); | |
1737 | if (tsp == NULL) | |
676dac4b | 1738 | return -ENOMEM; |
7898e1f8 CS |
1739 | |
1740 | cred->security = tsp; | |
1741 | ||
ee18d64c DH |
1742 | return 0; |
1743 | } | |
1744 | ||
1745 | ||
e114e473 | 1746 | /** |
f1752eec DH |
1747 | * smack_cred_free - "free" task-level security credentials |
1748 | * @cred: the credentials in question | |
e114e473 | 1749 | * |
e114e473 | 1750 | */ |
f1752eec | 1751 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1752 | { |
7898e1f8 CS |
1753 | struct task_smack *tsp = cred->security; |
1754 | struct smack_rule *rp; | |
1755 | struct list_head *l; | |
1756 | struct list_head *n; | |
1757 | ||
1758 | if (tsp == NULL) | |
1759 | return; | |
1760 | cred->security = NULL; | |
1761 | ||
1762 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1763 | rp = list_entry(l, struct smack_rule, list); | |
1764 | list_del(&rp->list); | |
1765 | kfree(rp); | |
1766 | } | |
1767 | kfree(tsp); | |
e114e473 CS |
1768 | } |
1769 | ||
d84f4f99 DH |
1770 | /** |
1771 | * smack_cred_prepare - prepare new set of credentials for modification | |
1772 | * @new: the new credentials | |
1773 | * @old: the original credentials | |
1774 | * @gfp: the atomicity of any memory allocations | |
1775 | * | |
1776 | * Prepare a new set of credentials for modification. | |
1777 | */ | |
1778 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1779 | gfp_t gfp) | |
1780 | { | |
676dac4b CS |
1781 | struct task_smack *old_tsp = old->security; |
1782 | struct task_smack *new_tsp; | |
7898e1f8 | 1783 | int rc; |
676dac4b | 1784 | |
7898e1f8 | 1785 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1786 | if (new_tsp == NULL) |
1787 | return -ENOMEM; | |
1788 | ||
7898e1f8 CS |
1789 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1790 | if (rc != 0) | |
1791 | return rc; | |
1792 | ||
676dac4b | 1793 | new->security = new_tsp; |
d84f4f99 DH |
1794 | return 0; |
1795 | } | |
1796 | ||
ee18d64c DH |
1797 | /** |
1798 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1799 | * @new: the new credentials | |
1800 | * @old: the original credentials | |
1801 | * | |
1802 | * Fill in a set of blank credentials from another set of credentials. | |
1803 | */ | |
1804 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1805 | { | |
676dac4b CS |
1806 | struct task_smack *old_tsp = old->security; |
1807 | struct task_smack *new_tsp = new->security; | |
1808 | ||
1809 | new_tsp->smk_task = old_tsp->smk_task; | |
1810 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1811 | mutex_init(&new_tsp->smk_rules_lock); |
1812 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1813 | ||
1814 | ||
1815 | /* cbs copy rule list */ | |
ee18d64c DH |
1816 | } |
1817 | ||
3a3b7ce9 DH |
1818 | /** |
1819 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1820 | * @new: points to the set of credentials to be modified. |
1821 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1822 | * |
1823 | * Set the security data for a kernel service. | |
1824 | */ | |
1825 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1826 | { | |
676dac4b | 1827 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1828 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1829 | |
2f823ff8 | 1830 | if (skp == NULL) |
3a3b7ce9 DH |
1831 | return -EINVAL; |
1832 | ||
2f823ff8 | 1833 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1834 | return 0; |
1835 | } | |
1836 | ||
1837 | /** | |
1838 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1839 | * @new: points to the set of credentials to be modified |
1840 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1841 | * |
1842 | * Set the file creation context in a set of credentials to the same | |
1843 | * as the objective context of the specified inode | |
1844 | */ | |
1845 | static int smack_kernel_create_files_as(struct cred *new, | |
1846 | struct inode *inode) | |
1847 | { | |
1848 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1849 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1850 | |
21c7eae2 | 1851 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 1852 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
1853 | return 0; |
1854 | } | |
1855 | ||
ecfcc53f EB |
1856 | /** |
1857 | * smk_curacc_on_task - helper to log task related access | |
1858 | * @p: the task object | |
531f1d45 CS |
1859 | * @access: the access requested |
1860 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1861 | * |
1862 | * Return 0 if access is permitted | |
1863 | */ | |
531f1d45 CS |
1864 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1865 | const char *caller) | |
ecfcc53f EB |
1866 | { |
1867 | struct smk_audit_info ad; | |
6d1cff2a | 1868 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 1869 | int rc; |
ecfcc53f | 1870 | |
531f1d45 | 1871 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1872 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 1873 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
1874 | rc = smk_bu_task(p, access, rc); |
1875 | return rc; | |
ecfcc53f EB |
1876 | } |
1877 | ||
e114e473 CS |
1878 | /** |
1879 | * smack_task_setpgid - Smack check on setting pgid | |
1880 | * @p: the task object | |
1881 | * @pgid: unused | |
1882 | * | |
1883 | * Return 0 if write access is permitted | |
1884 | */ | |
1885 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1886 | { | |
531f1d45 | 1887 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1888 | } |
1889 | ||
1890 | /** | |
1891 | * smack_task_getpgid - Smack access check for getpgid | |
1892 | * @p: the object task | |
1893 | * | |
1894 | * Returns 0 if current can read the object task, error code otherwise | |
1895 | */ | |
1896 | static int smack_task_getpgid(struct task_struct *p) | |
1897 | { | |
531f1d45 | 1898 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1899 | } |
1900 | ||
1901 | /** | |
1902 | * smack_task_getsid - Smack access check for getsid | |
1903 | * @p: the object task | |
1904 | * | |
1905 | * Returns 0 if current can read the object task, error code otherwise | |
1906 | */ | |
1907 | static int smack_task_getsid(struct task_struct *p) | |
1908 | { | |
531f1d45 | 1909 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1910 | } |
1911 | ||
1912 | /** | |
1913 | * smack_task_getsecid - get the secid of the task | |
1914 | * @p: the object task | |
1915 | * @secid: where to put the result | |
1916 | * | |
1917 | * Sets the secid to contain a u32 version of the smack label. | |
1918 | */ | |
1919 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1920 | { | |
6d1cff2a | 1921 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
1922 | |
1923 | *secid = skp->smk_secid; | |
e114e473 CS |
1924 | } |
1925 | ||
1926 | /** | |
1927 | * smack_task_setnice - Smack check on setting nice | |
1928 | * @p: the task object | |
1929 | * @nice: unused | |
1930 | * | |
1931 | * Return 0 if write access is permitted | |
1932 | */ | |
1933 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1934 | { | |
b1d9e6b0 | 1935 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1936 | } |
1937 | ||
1938 | /** | |
1939 | * smack_task_setioprio - Smack check on setting ioprio | |
1940 | * @p: the task object | |
1941 | * @ioprio: unused | |
1942 | * | |
1943 | * Return 0 if write access is permitted | |
1944 | */ | |
1945 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1946 | { | |
b1d9e6b0 | 1947 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1948 | } |
1949 | ||
1950 | /** | |
1951 | * smack_task_getioprio - Smack check on reading ioprio | |
1952 | * @p: the task object | |
1953 | * | |
1954 | * Return 0 if read access is permitted | |
1955 | */ | |
1956 | static int smack_task_getioprio(struct task_struct *p) | |
1957 | { | |
531f1d45 | 1958 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1959 | } |
1960 | ||
1961 | /** | |
1962 | * smack_task_setscheduler - Smack check on setting scheduler | |
1963 | * @p: the task object | |
1964 | * @policy: unused | |
1965 | * @lp: unused | |
1966 | * | |
1967 | * Return 0 if read access is permitted | |
1968 | */ | |
b0ae1981 | 1969 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1970 | { |
b1d9e6b0 | 1971 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1972 | } |
1973 | ||
1974 | /** | |
1975 | * smack_task_getscheduler - Smack check on reading scheduler | |
1976 | * @p: the task object | |
1977 | * | |
1978 | * Return 0 if read access is permitted | |
1979 | */ | |
1980 | static int smack_task_getscheduler(struct task_struct *p) | |
1981 | { | |
531f1d45 | 1982 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1983 | } |
1984 | ||
1985 | /** | |
1986 | * smack_task_movememory - Smack check on moving memory | |
1987 | * @p: the task object | |
1988 | * | |
1989 | * Return 0 if write access is permitted | |
1990 | */ | |
1991 | static int smack_task_movememory(struct task_struct *p) | |
1992 | { | |
531f1d45 | 1993 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1994 | } |
1995 | ||
1996 | /** | |
1997 | * smack_task_kill - Smack check on signal delivery | |
1998 | * @p: the task object | |
1999 | * @info: unused | |
2000 | * @sig: unused | |
2001 | * @secid: identifies the smack to use in lieu of current's | |
2002 | * | |
2003 | * Return 0 if write access is permitted | |
2004 | * | |
2005 | * The secid behavior is an artifact of an SELinux hack | |
2006 | * in the USB code. Someday it may go away. | |
2007 | */ | |
2008 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
2009 | int sig, u32 secid) | |
2010 | { | |
ecfcc53f | 2011 | struct smk_audit_info ad; |
2f823ff8 | 2012 | struct smack_known *skp; |
6d1cff2a | 2013 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2014 | int rc; |
ecfcc53f EB |
2015 | |
2016 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
2017 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2018 | /* |
2019 | * Sending a signal requires that the sender | |
2020 | * can write the receiver. | |
2021 | */ | |
d166c802 | 2022 | if (secid == 0) { |
21c7eae2 | 2023 | rc = smk_curacc(tkp, MAY_WRITE, &ad); |
d166c802 CS |
2024 | rc = smk_bu_task(p, MAY_WRITE, rc); |
2025 | return rc; | |
2026 | } | |
e114e473 CS |
2027 | /* |
2028 | * If the secid isn't 0 we're dealing with some USB IO | |
2029 | * specific behavior. This is not clean. For one thing | |
2030 | * we can't take privilege into account. | |
2031 | */ | |
2f823ff8 | 2032 | skp = smack_from_secid(secid); |
21c7eae2 LP |
2033 | rc = smk_access(skp, tkp, MAY_WRITE, &ad); |
2034 | rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc); | |
d166c802 | 2035 | return rc; |
e114e473 CS |
2036 | } |
2037 | ||
2038 | /** | |
2039 | * smack_task_wait - Smack access check for waiting | |
2040 | * @p: task to wait for | |
2041 | * | |
c00bedb3 | 2042 | * Returns 0 |
e114e473 CS |
2043 | */ |
2044 | static int smack_task_wait(struct task_struct *p) | |
2045 | { | |
e114e473 | 2046 | /* |
c00bedb3 CS |
2047 | * Allow the operation to succeed. |
2048 | * Zombies are bad. | |
2049 | * In userless environments (e.g. phones) programs | |
2050 | * get marked with SMACK64EXEC and even if the parent | |
2051 | * and child shouldn't be talking the parent still | |
2052 | * may expect to know when the child exits. | |
e114e473 | 2053 | */ |
c00bedb3 | 2054 | return 0; |
e114e473 CS |
2055 | } |
2056 | ||
2057 | /** | |
2058 | * smack_task_to_inode - copy task smack into the inode blob | |
2059 | * @p: task to copy from | |
251a2a95 | 2060 | * @inode: inode to copy to |
e114e473 CS |
2061 | * |
2062 | * Sets the smack pointer in the inode security blob | |
2063 | */ | |
2064 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2065 | { | |
2066 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2067 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2068 | |
21c7eae2 | 2069 | isp->smk_inode = skp; |
e114e473 CS |
2070 | } |
2071 | ||
2072 | /* | |
2073 | * Socket hooks. | |
2074 | */ | |
2075 | ||
2076 | /** | |
2077 | * smack_sk_alloc_security - Allocate a socket blob | |
2078 | * @sk: the socket | |
2079 | * @family: unused | |
251a2a95 | 2080 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2081 | * |
2082 | * Assign Smack pointers to current | |
2083 | * | |
2084 | * Returns 0 on success, -ENOMEM is there's no memory | |
2085 | */ | |
2086 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2087 | { | |
2f823ff8 | 2088 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2089 | struct socket_smack *ssp; |
2090 | ||
2091 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2092 | if (ssp == NULL) | |
2093 | return -ENOMEM; | |
2094 | ||
54e70ec5 | 2095 | ssp->smk_in = skp; |
2f823ff8 | 2096 | ssp->smk_out = skp; |
272cd7a8 | 2097 | ssp->smk_packet = NULL; |
e114e473 CS |
2098 | |
2099 | sk->sk_security = ssp; | |
2100 | ||
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | /** | |
2105 | * smack_sk_free_security - Free a socket blob | |
2106 | * @sk: the socket | |
2107 | * | |
2108 | * Clears the blob pointer | |
2109 | */ | |
2110 | static void smack_sk_free_security(struct sock *sk) | |
2111 | { | |
2112 | kfree(sk->sk_security); | |
2113 | } | |
2114 | ||
07feee8f PM |
2115 | /** |
2116 | * smack_host_label - check host based restrictions | |
2117 | * @sip: the object end | |
2118 | * | |
2119 | * looks for host based access restrictions | |
2120 | * | |
2121 | * This version will only be appropriate for really small sets of single label | |
2122 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2123 | * taken before calling this function. | |
2124 | * | |
2125 | * Returns the label of the far end or NULL if it's not special. | |
2126 | */ | |
21c7eae2 | 2127 | static struct smack_known *smack_host_label(struct sockaddr_in *sip) |
07feee8f PM |
2128 | { |
2129 | struct smk_netlbladdr *snp; | |
2130 | struct in_addr *siap = &sip->sin_addr; | |
2131 | ||
2132 | if (siap->s_addr == 0) | |
2133 | return NULL; | |
2134 | ||
2135 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
2136 | /* | |
2137 | * we break after finding the first match because | |
2138 | * the list is sorted from longest to shortest mask | |
2139 | * so we have found the most specific match | |
2140 | */ | |
2141 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
2142 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
2143 | /* we have found the special CIPSO option */ | |
21c7eae2 | 2144 | if (snp->smk_label == &smack_cipso_option) |
4303154e | 2145 | return NULL; |
07feee8f | 2146 | return snp->smk_label; |
4303154e | 2147 | } |
07feee8f PM |
2148 | |
2149 | return NULL; | |
2150 | } | |
2151 | ||
e114e473 CS |
2152 | /** |
2153 | * smack_netlabel - Set the secattr on a socket | |
2154 | * @sk: the socket | |
6d3dc07c | 2155 | * @labeled: socket label scheme |
e114e473 CS |
2156 | * |
2157 | * Convert the outbound smack value (smk_out) to a | |
2158 | * secattr and attach it to the socket. | |
2159 | * | |
2160 | * Returns 0 on success or an error code | |
2161 | */ | |
6d3dc07c | 2162 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2163 | { |
f7112e6c | 2164 | struct smack_known *skp; |
07feee8f | 2165 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2166 | int rc = 0; |
e114e473 | 2167 | |
6d3dc07c CS |
2168 | /* |
2169 | * Usually the netlabel code will handle changing the | |
2170 | * packet labeling based on the label. | |
2171 | * The case of a single label host is different, because | |
2172 | * a single label host should never get a labeled packet | |
2173 | * even though the label is usually associated with a packet | |
2174 | * label. | |
2175 | */ | |
2176 | local_bh_disable(); | |
2177 | bh_lock_sock_nested(sk); | |
2178 | ||
2179 | if (ssp->smk_out == smack_net_ambient || | |
2180 | labeled == SMACK_UNLABELED_SOCKET) | |
2181 | netlbl_sock_delattr(sk); | |
2182 | else { | |
2f823ff8 | 2183 | skp = ssp->smk_out; |
f7112e6c | 2184 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2185 | } |
2186 | ||
2187 | bh_unlock_sock(sk); | |
2188 | local_bh_enable(); | |
4bc87e62 | 2189 | |
e114e473 CS |
2190 | return rc; |
2191 | } | |
2192 | ||
07feee8f PM |
2193 | /** |
2194 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2195 | * @sk: the socket | |
2196 | * @sap: the destination address | |
2197 | * | |
2198 | * Set the correct secattr for the given socket based on the destination | |
2199 | * address and perform any outbound access checks needed. | |
2200 | * | |
2201 | * Returns 0 on success or an error code. | |
2202 | * | |
2203 | */ | |
2204 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2205 | { | |
2f823ff8 | 2206 | struct smack_known *skp; |
07feee8f PM |
2207 | int rc; |
2208 | int sk_lbl; | |
21c7eae2 | 2209 | struct smack_known *hkp; |
07feee8f | 2210 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2211 | struct smk_audit_info ad; |
07feee8f PM |
2212 | |
2213 | rcu_read_lock(); | |
21c7eae2 LP |
2214 | hkp = smack_host_label(sap); |
2215 | if (hkp != NULL) { | |
ecfcc53f | 2216 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2217 | struct lsm_network_audit net; |
2218 | ||
48c62af6 EP |
2219 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2220 | ad.a.u.net->family = sap->sin_family; | |
2221 | ad.a.u.net->dport = sap->sin_port; | |
2222 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2223 | #endif |
923e9a13 | 2224 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2225 | skp = ssp->smk_out; |
21c7eae2 LP |
2226 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2227 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2228 | } else { |
2229 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2230 | rc = 0; | |
2231 | } | |
2232 | rcu_read_unlock(); | |
2233 | if (rc != 0) | |
2234 | return rc; | |
2235 | ||
2236 | return smack_netlabel(sk, sk_lbl); | |
2237 | } | |
2238 | ||
69f287ae | 2239 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
c6739443 CS |
2240 | /** |
2241 | * smk_ipv6_port_label - Smack port access table management | |
2242 | * @sock: socket | |
2243 | * @address: address | |
2244 | * | |
2245 | * Create or update the port list entry | |
2246 | */ | |
2247 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2248 | { | |
2249 | struct sock *sk = sock->sk; | |
2250 | struct sockaddr_in6 *addr6; | |
2251 | struct socket_smack *ssp = sock->sk->sk_security; | |
2252 | struct smk_port_label *spp; | |
2253 | unsigned short port = 0; | |
2254 | ||
2255 | if (address == NULL) { | |
2256 | /* | |
2257 | * This operation is changing the Smack information | |
2258 | * on the bound socket. Take the changes to the port | |
2259 | * as well. | |
2260 | */ | |
2261 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2262 | if (sk != spp->smk_sock) | |
2263 | continue; | |
2264 | spp->smk_in = ssp->smk_in; | |
2265 | spp->smk_out = ssp->smk_out; | |
2266 | return; | |
2267 | } | |
2268 | /* | |
2269 | * A NULL address is only used for updating existing | |
2270 | * bound entries. If there isn't one, it's OK. | |
2271 | */ | |
2272 | return; | |
2273 | } | |
2274 | ||
2275 | addr6 = (struct sockaddr_in6 *)address; | |
2276 | port = ntohs(addr6->sin6_port); | |
2277 | /* | |
2278 | * This is a special case that is safely ignored. | |
2279 | */ | |
2280 | if (port == 0) | |
2281 | return; | |
2282 | ||
2283 | /* | |
2284 | * Look for an existing port list entry. | |
2285 | * This is an indication that a port is getting reused. | |
2286 | */ | |
2287 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2288 | if (spp->smk_port != port) | |
2289 | continue; | |
2290 | spp->smk_port = port; | |
2291 | spp->smk_sock = sk; | |
2292 | spp->smk_in = ssp->smk_in; | |
2293 | spp->smk_out = ssp->smk_out; | |
2294 | return; | |
2295 | } | |
2296 | ||
2297 | /* | |
2298 | * A new port entry is required. | |
2299 | */ | |
2300 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2301 | if (spp == NULL) | |
2302 | return; | |
2303 | ||
2304 | spp->smk_port = port; | |
2305 | spp->smk_sock = sk; | |
2306 | spp->smk_in = ssp->smk_in; | |
2307 | spp->smk_out = ssp->smk_out; | |
2308 | ||
2309 | list_add(&spp->list, &smk_ipv6_port_list); | |
2310 | return; | |
2311 | } | |
2312 | ||
2313 | /** | |
2314 | * smk_ipv6_port_check - check Smack port access | |
2315 | * @sock: socket | |
2316 | * @address: address | |
2317 | * | |
2318 | * Create or update the port list entry | |
2319 | */ | |
6ea06247 | 2320 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2321 | int act) |
2322 | { | |
2323 | __be16 *bep; | |
2324 | __be32 *be32p; | |
c6739443 CS |
2325 | struct smk_port_label *spp; |
2326 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 2327 | struct smack_known *skp; |
c6739443 | 2328 | unsigned short port = 0; |
21c7eae2 | 2329 | struct smack_known *object; |
c6739443 | 2330 | struct smk_audit_info ad; |
d166c802 | 2331 | int rc; |
c6739443 CS |
2332 | #ifdef CONFIG_AUDIT |
2333 | struct lsm_network_audit net; | |
2334 | #endif | |
2335 | ||
2336 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2337 | skp = smack_net_ambient; |
21c7eae2 | 2338 | object = ssp->smk_in; |
c6739443 | 2339 | } else { |
2f823ff8 | 2340 | skp = ssp->smk_out; |
21c7eae2 | 2341 | object = smack_net_ambient; |
c6739443 CS |
2342 | } |
2343 | ||
2344 | /* | |
2345 | * Get the IP address and port from the address. | |
2346 | */ | |
6ea06247 CS |
2347 | port = ntohs(address->sin6_port); |
2348 | bep = (__be16 *)(&address->sin6_addr); | |
2349 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2350 | |
2351 | /* | |
2352 | * It's remote, so port lookup does no good. | |
2353 | */ | |
2354 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2355 | goto auditout; | |
2356 | ||
2357 | /* | |
2358 | * It's local so the send check has to have passed. | |
2359 | */ | |
2360 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2361 | skp = &smack_known_web; |
c6739443 CS |
2362 | goto auditout; |
2363 | } | |
2364 | ||
2365 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2366 | if (spp->smk_port != port) | |
2367 | continue; | |
21c7eae2 | 2368 | object = spp->smk_in; |
c6739443 | 2369 | if (act == SMK_CONNECTING) |
54e70ec5 | 2370 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2371 | break; |
2372 | } | |
2373 | ||
2374 | auditout: | |
2375 | ||
2376 | #ifdef CONFIG_AUDIT | |
2377 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2378 | ad.a.u.net->family = sk->sk_family; | |
2379 | ad.a.u.net->dport = port; | |
2380 | if (act == SMK_RECEIVING) | |
6ea06247 | 2381 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2382 | else |
6ea06247 | 2383 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2384 | #endif |
d166c802 CS |
2385 | rc = smk_access(skp, object, MAY_WRITE, &ad); |
2386 | rc = smk_bu_note("IPv6 port check", skp, object, MAY_WRITE, rc); | |
2387 | return rc; | |
c6739443 | 2388 | } |
69f287ae | 2389 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 | 2390 | |
e114e473 CS |
2391 | /** |
2392 | * smack_inode_setsecurity - set smack xattrs | |
2393 | * @inode: the object | |
2394 | * @name: attribute name | |
2395 | * @value: attribute value | |
2396 | * @size: size of the attribute | |
2397 | * @flags: unused | |
2398 | * | |
2399 | * Sets the named attribute in the appropriate blob | |
2400 | * | |
2401 | * Returns 0 on success, or an error code | |
2402 | */ | |
2403 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2404 | const void *value, size_t size, int flags) | |
2405 | { | |
2f823ff8 | 2406 | struct smack_known *skp; |
e114e473 CS |
2407 | struct inode_smack *nsp = inode->i_security; |
2408 | struct socket_smack *ssp; | |
2409 | struct socket *sock; | |
4bc87e62 | 2410 | int rc = 0; |
e114e473 | 2411 | |
f7112e6c | 2412 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2413 | return -EINVAL; |
e114e473 | 2414 | |
2f823ff8 | 2415 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2416 | if (IS_ERR(skp)) |
2417 | return PTR_ERR(skp); | |
e114e473 CS |
2418 | |
2419 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2420 | nsp->smk_inode = skp; |
ddd29ec6 | 2421 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2422 | return 0; |
2423 | } | |
2424 | /* | |
2425 | * The rest of the Smack xattrs are only on sockets. | |
2426 | */ | |
2427 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2428 | return -EOPNOTSUPP; | |
2429 | ||
2430 | sock = SOCKET_I(inode); | |
2e1d146a | 2431 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2432 | return -EOPNOTSUPP; |
2433 | ||
2434 | ssp = sock->sk->sk_security; | |
2435 | ||
2436 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2437 | ssp->smk_in = skp; |
e114e473 | 2438 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2439 | ssp->smk_out = skp; |
c6739443 | 2440 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2441 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2442 | if (rc != 0) | |
2443 | printk(KERN_WARNING | |
2444 | "Smack: \"%s\" netlbl error %d.\n", | |
2445 | __func__, -rc); | |
2446 | } | |
e114e473 CS |
2447 | } else |
2448 | return -EOPNOTSUPP; | |
2449 | ||
69f287ae | 2450 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
c6739443 CS |
2451 | if (sock->sk->sk_family == PF_INET6) |
2452 | smk_ipv6_port_label(sock, NULL); | |
69f287ae | 2453 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 | 2454 | |
e114e473 CS |
2455 | return 0; |
2456 | } | |
2457 | ||
2458 | /** | |
2459 | * smack_socket_post_create - finish socket setup | |
2460 | * @sock: the socket | |
2461 | * @family: protocol family | |
2462 | * @type: unused | |
2463 | * @protocol: unused | |
2464 | * @kern: unused | |
2465 | * | |
2466 | * Sets the netlabel information on the socket | |
2467 | * | |
2468 | * Returns 0 on success, and error code otherwise | |
2469 | */ | |
2470 | static int smack_socket_post_create(struct socket *sock, int family, | |
2471 | int type, int protocol, int kern) | |
2472 | { | |
7412301b ML |
2473 | struct socket_smack *ssp; |
2474 | ||
2475 | if (sock->sk == NULL) | |
2476 | return 0; | |
2477 | ||
2478 | /* | |
2479 | * Sockets created by kernel threads receive web label. | |
2480 | */ | |
2481 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2482 | ssp = sock->sk->sk_security; | |
2483 | ssp->smk_in = &smack_known_web; | |
2484 | ssp->smk_out = &smack_known_web; | |
2485 | } | |
2486 | ||
2487 | if (family != PF_INET) | |
e114e473 CS |
2488 | return 0; |
2489 | /* | |
2490 | * Set the outbound netlbl. | |
2491 | */ | |
6d3dc07c CS |
2492 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2493 | } | |
2494 | ||
69f287ae | 2495 | #ifndef CONFIG_SECURITY_SMACK_NETFILTER |
c6739443 CS |
2496 | /** |
2497 | * smack_socket_bind - record port binding information. | |
2498 | * @sock: the socket | |
2499 | * @address: the port address | |
2500 | * @addrlen: size of the address | |
2501 | * | |
2502 | * Records the label bound to a port. | |
2503 | * | |
2504 | * Returns 0 | |
2505 | */ | |
2506 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2507 | int addrlen) | |
2508 | { | |
69f287ae | 2509 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
2510 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) |
2511 | smk_ipv6_port_label(sock, address); | |
69f287ae | 2512 | #endif |
c6739443 CS |
2513 | |
2514 | return 0; | |
2515 | } | |
69f287ae | 2516 | #endif /* !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 | 2517 | |
6d3dc07c CS |
2518 | /** |
2519 | * smack_socket_connect - connect access check | |
2520 | * @sock: the socket | |
2521 | * @sap: the other end | |
2522 | * @addrlen: size of sap | |
2523 | * | |
2524 | * Verifies that a connection may be possible | |
2525 | * | |
2526 | * Returns 0 on success, and error code otherwise | |
2527 | */ | |
2528 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2529 | int addrlen) | |
2530 | { | |
c6739443 CS |
2531 | int rc = 0; |
2532 | ||
2533 | if (sock->sk == NULL) | |
6d3dc07c | 2534 | return 0; |
6d3dc07c | 2535 | |
c6739443 CS |
2536 | switch (sock->sk->sk_family) { |
2537 | case PF_INET: | |
2538 | if (addrlen < sizeof(struct sockaddr_in)) | |
2539 | return -EINVAL; | |
2540 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2541 | break; | |
2542 | case PF_INET6: | |
2543 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2544 | return -EINVAL; | |
69f287ae | 2545 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
6ea06247 CS |
2546 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2547 | SMK_CONNECTING); | |
69f287ae | 2548 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 CS |
2549 | break; |
2550 | } | |
2551 | return rc; | |
e114e473 CS |
2552 | } |
2553 | ||
2554 | /** | |
2555 | * smack_flags_to_may - convert S_ to MAY_ values | |
2556 | * @flags: the S_ value | |
2557 | * | |
2558 | * Returns the equivalent MAY_ value | |
2559 | */ | |
2560 | static int smack_flags_to_may(int flags) | |
2561 | { | |
2562 | int may = 0; | |
2563 | ||
2564 | if (flags & S_IRUGO) | |
2565 | may |= MAY_READ; | |
2566 | if (flags & S_IWUGO) | |
2567 | may |= MAY_WRITE; | |
2568 | if (flags & S_IXUGO) | |
2569 | may |= MAY_EXEC; | |
2570 | ||
2571 | return may; | |
2572 | } | |
2573 | ||
2574 | /** | |
2575 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2576 | * @msg: the object | |
2577 | * | |
2578 | * Returns 0 | |
2579 | */ | |
2580 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2581 | { | |
2f823ff8 CS |
2582 | struct smack_known *skp = smk_of_current(); |
2583 | ||
21c7eae2 | 2584 | msg->security = skp; |
e114e473 CS |
2585 | return 0; |
2586 | } | |
2587 | ||
2588 | /** | |
2589 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2590 | * @msg: the object | |
2591 | * | |
2592 | * Clears the blob pointer | |
2593 | */ | |
2594 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2595 | { | |
2596 | msg->security = NULL; | |
2597 | } | |
2598 | ||
2599 | /** | |
2600 | * smack_of_shm - the smack pointer for the shm | |
2601 | * @shp: the object | |
2602 | * | |
2603 | * Returns a pointer to the smack value | |
2604 | */ | |
21c7eae2 | 2605 | static struct smack_known *smack_of_shm(struct shmid_kernel *shp) |
e114e473 | 2606 | { |
21c7eae2 | 2607 | return (struct smack_known *)shp->shm_perm.security; |
e114e473 CS |
2608 | } |
2609 | ||
2610 | /** | |
2611 | * smack_shm_alloc_security - Set the security blob for shm | |
2612 | * @shp: the object | |
2613 | * | |
2614 | * Returns 0 | |
2615 | */ | |
2616 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2617 | { | |
2618 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2619 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2620 | |
21c7eae2 | 2621 | isp->security = skp; |
e114e473 CS |
2622 | return 0; |
2623 | } | |
2624 | ||
2625 | /** | |
2626 | * smack_shm_free_security - Clear the security blob for shm | |
2627 | * @shp: the object | |
2628 | * | |
2629 | * Clears the blob pointer | |
2630 | */ | |
2631 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2632 | { | |
2633 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2634 | ||
2635 | isp->security = NULL; | |
2636 | } | |
2637 | ||
ecfcc53f EB |
2638 | /** |
2639 | * smk_curacc_shm : check if current has access on shm | |
2640 | * @shp : the object | |
2641 | * @access : access requested | |
2642 | * | |
2643 | * Returns 0 if current has the requested access, error code otherwise | |
2644 | */ | |
2645 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2646 | { | |
21c7eae2 | 2647 | struct smack_known *ssp = smack_of_shm(shp); |
ecfcc53f | 2648 | struct smk_audit_info ad; |
d166c802 | 2649 | int rc; |
ecfcc53f EB |
2650 | |
2651 | #ifdef CONFIG_AUDIT | |
2652 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2653 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2654 | #endif | |
d166c802 CS |
2655 | rc = smk_curacc(ssp, access, &ad); |
2656 | rc = smk_bu_current("shm", ssp, access, rc); | |
2657 | return rc; | |
ecfcc53f EB |
2658 | } |
2659 | ||
e114e473 CS |
2660 | /** |
2661 | * smack_shm_associate - Smack access check for shm | |
2662 | * @shp: the object | |
2663 | * @shmflg: access requested | |
2664 | * | |
2665 | * Returns 0 if current has the requested access, error code otherwise | |
2666 | */ | |
2667 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2668 | { | |
e114e473 CS |
2669 | int may; |
2670 | ||
2671 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2672 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2673 | } |
2674 | ||
2675 | /** | |
2676 | * smack_shm_shmctl - Smack access check for shm | |
2677 | * @shp: the object | |
2678 | * @cmd: what it wants to do | |
2679 | * | |
2680 | * Returns 0 if current has the requested access, error code otherwise | |
2681 | */ | |
2682 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2683 | { | |
e114e473 CS |
2684 | int may; |
2685 | ||
2686 | switch (cmd) { | |
2687 | case IPC_STAT: | |
2688 | case SHM_STAT: | |
2689 | may = MAY_READ; | |
2690 | break; | |
2691 | case IPC_SET: | |
2692 | case SHM_LOCK: | |
2693 | case SHM_UNLOCK: | |
2694 | case IPC_RMID: | |
2695 | may = MAY_READWRITE; | |
2696 | break; | |
2697 | case IPC_INFO: | |
2698 | case SHM_INFO: | |
2699 | /* | |
2700 | * System level information. | |
2701 | */ | |
2702 | return 0; | |
2703 | default: | |
2704 | return -EINVAL; | |
2705 | } | |
ecfcc53f | 2706 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2707 | } |
2708 | ||
2709 | /** | |
2710 | * smack_shm_shmat - Smack access for shmat | |
2711 | * @shp: the object | |
2712 | * @shmaddr: unused | |
2713 | * @shmflg: access requested | |
2714 | * | |
2715 | * Returns 0 if current has the requested access, error code otherwise | |
2716 | */ | |
2717 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2718 | int shmflg) | |
2719 | { | |
e114e473 CS |
2720 | int may; |
2721 | ||
2722 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2723 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2724 | } |
2725 | ||
2726 | /** | |
2727 | * smack_of_sem - the smack pointer for the sem | |
2728 | * @sma: the object | |
2729 | * | |
2730 | * Returns a pointer to the smack value | |
2731 | */ | |
21c7eae2 | 2732 | static struct smack_known *smack_of_sem(struct sem_array *sma) |
e114e473 | 2733 | { |
21c7eae2 | 2734 | return (struct smack_known *)sma->sem_perm.security; |
e114e473 CS |
2735 | } |
2736 | ||
2737 | /** | |
2738 | * smack_sem_alloc_security - Set the security blob for sem | |
2739 | * @sma: the object | |
2740 | * | |
2741 | * Returns 0 | |
2742 | */ | |
2743 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2744 | { | |
2745 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2746 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2747 | |
21c7eae2 | 2748 | isp->security = skp; |
e114e473 CS |
2749 | return 0; |
2750 | } | |
2751 | ||
2752 | /** | |
2753 | * smack_sem_free_security - Clear the security blob for sem | |
2754 | * @sma: the object | |
2755 | * | |
2756 | * Clears the blob pointer | |
2757 | */ | |
2758 | static void smack_sem_free_security(struct sem_array *sma) | |
2759 | { | |
2760 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2761 | ||
2762 | isp->security = NULL; | |
2763 | } | |
2764 | ||
ecfcc53f EB |
2765 | /** |
2766 | * smk_curacc_sem : check if current has access on sem | |
2767 | * @sma : the object | |
2768 | * @access : access requested | |
2769 | * | |
2770 | * Returns 0 if current has the requested access, error code otherwise | |
2771 | */ | |
2772 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2773 | { | |
21c7eae2 | 2774 | struct smack_known *ssp = smack_of_sem(sma); |
ecfcc53f | 2775 | struct smk_audit_info ad; |
d166c802 | 2776 | int rc; |
ecfcc53f EB |
2777 | |
2778 | #ifdef CONFIG_AUDIT | |
2779 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2780 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2781 | #endif | |
d166c802 CS |
2782 | rc = smk_curacc(ssp, access, &ad); |
2783 | rc = smk_bu_current("sem", ssp, access, rc); | |
2784 | return rc; | |
ecfcc53f EB |
2785 | } |
2786 | ||
e114e473 CS |
2787 | /** |
2788 | * smack_sem_associate - Smack access check for sem | |
2789 | * @sma: the object | |
2790 | * @semflg: access requested | |
2791 | * | |
2792 | * Returns 0 if current has the requested access, error code otherwise | |
2793 | */ | |
2794 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2795 | { | |
e114e473 CS |
2796 | int may; |
2797 | ||
2798 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2799 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2800 | } |
2801 | ||
2802 | /** | |
2803 | * smack_sem_shmctl - Smack access check for sem | |
2804 | * @sma: the object | |
2805 | * @cmd: what it wants to do | |
2806 | * | |
2807 | * Returns 0 if current has the requested access, error code otherwise | |
2808 | */ | |
2809 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2810 | { | |
e114e473 CS |
2811 | int may; |
2812 | ||
2813 | switch (cmd) { | |
2814 | case GETPID: | |
2815 | case GETNCNT: | |
2816 | case GETZCNT: | |
2817 | case GETVAL: | |
2818 | case GETALL: | |
2819 | case IPC_STAT: | |
2820 | case SEM_STAT: | |
2821 | may = MAY_READ; | |
2822 | break; | |
2823 | case SETVAL: | |
2824 | case SETALL: | |
2825 | case IPC_RMID: | |
2826 | case IPC_SET: | |
2827 | may = MAY_READWRITE; | |
2828 | break; | |
2829 | case IPC_INFO: | |
2830 | case SEM_INFO: | |
2831 | /* | |
2832 | * System level information | |
2833 | */ | |
2834 | return 0; | |
2835 | default: | |
2836 | return -EINVAL; | |
2837 | } | |
2838 | ||
ecfcc53f | 2839 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2840 | } |
2841 | ||
2842 | /** | |
2843 | * smack_sem_semop - Smack checks of semaphore operations | |
2844 | * @sma: the object | |
2845 | * @sops: unused | |
2846 | * @nsops: unused | |
2847 | * @alter: unused | |
2848 | * | |
2849 | * Treated as read and write in all cases. | |
2850 | * | |
2851 | * Returns 0 if access is allowed, error code otherwise | |
2852 | */ | |
2853 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2854 | unsigned nsops, int alter) | |
2855 | { | |
ecfcc53f | 2856 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2857 | } |
2858 | ||
2859 | /** | |
2860 | * smack_msg_alloc_security - Set the security blob for msg | |
2861 | * @msq: the object | |
2862 | * | |
2863 | * Returns 0 | |
2864 | */ | |
2865 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2866 | { | |
2867 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2868 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2869 | |
21c7eae2 | 2870 | kisp->security = skp; |
e114e473 CS |
2871 | return 0; |
2872 | } | |
2873 | ||
2874 | /** | |
2875 | * smack_msg_free_security - Clear the security blob for msg | |
2876 | * @msq: the object | |
2877 | * | |
2878 | * Clears the blob pointer | |
2879 | */ | |
2880 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2881 | { | |
2882 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2883 | ||
2884 | kisp->security = NULL; | |
2885 | } | |
2886 | ||
2887 | /** | |
2888 | * smack_of_msq - the smack pointer for the msq | |
2889 | * @msq: the object | |
2890 | * | |
21c7eae2 | 2891 | * Returns a pointer to the smack label entry |
e114e473 | 2892 | */ |
21c7eae2 | 2893 | static struct smack_known *smack_of_msq(struct msg_queue *msq) |
e114e473 | 2894 | { |
21c7eae2 | 2895 | return (struct smack_known *)msq->q_perm.security; |
e114e473 CS |
2896 | } |
2897 | ||
ecfcc53f EB |
2898 | /** |
2899 | * smk_curacc_msq : helper to check if current has access on msq | |
2900 | * @msq : the msq | |
2901 | * @access : access requested | |
2902 | * | |
2903 | * return 0 if current has access, error otherwise | |
2904 | */ | |
2905 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2906 | { | |
21c7eae2 | 2907 | struct smack_known *msp = smack_of_msq(msq); |
ecfcc53f | 2908 | struct smk_audit_info ad; |
d166c802 | 2909 | int rc; |
ecfcc53f EB |
2910 | |
2911 | #ifdef CONFIG_AUDIT | |
2912 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2913 | ad.a.u.ipc_id = msq->q_perm.id; | |
2914 | #endif | |
d166c802 CS |
2915 | rc = smk_curacc(msp, access, &ad); |
2916 | rc = smk_bu_current("msq", msp, access, rc); | |
2917 | return rc; | |
ecfcc53f EB |
2918 | } |
2919 | ||
e114e473 CS |
2920 | /** |
2921 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2922 | * @msq: the object | |
2923 | * @msqflg: access requested | |
2924 | * | |
2925 | * Returns 0 if current has the requested access, error code otherwise | |
2926 | */ | |
2927 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2928 | { | |
e114e473 CS |
2929 | int may; |
2930 | ||
2931 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2932 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2933 | } |
2934 | ||
2935 | /** | |
2936 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2937 | * @msq: the object | |
2938 | * @cmd: what it wants to do | |
2939 | * | |
2940 | * Returns 0 if current has the requested access, error code otherwise | |
2941 | */ | |
2942 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2943 | { | |
e114e473 CS |
2944 | int may; |
2945 | ||
2946 | switch (cmd) { | |
2947 | case IPC_STAT: | |
2948 | case MSG_STAT: | |
2949 | may = MAY_READ; | |
2950 | break; | |
2951 | case IPC_SET: | |
2952 | case IPC_RMID: | |
2953 | may = MAY_READWRITE; | |
2954 | break; | |
2955 | case IPC_INFO: | |
2956 | case MSG_INFO: | |
2957 | /* | |
2958 | * System level information | |
2959 | */ | |
2960 | return 0; | |
2961 | default: | |
2962 | return -EINVAL; | |
2963 | } | |
2964 | ||
ecfcc53f | 2965 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2966 | } |
2967 | ||
2968 | /** | |
2969 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2970 | * @msq: the object | |
2971 | * @msg: unused | |
2972 | * @msqflg: access requested | |
2973 | * | |
2974 | * Returns 0 if current has the requested access, error code otherwise | |
2975 | */ | |
2976 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2977 | int msqflg) | |
2978 | { | |
ecfcc53f | 2979 | int may; |
e114e473 | 2980 | |
ecfcc53f EB |
2981 | may = smack_flags_to_may(msqflg); |
2982 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2983 | } |
2984 | ||
2985 | /** | |
2986 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2987 | * @msq: the object | |
2988 | * @msg: unused | |
2989 | * @target: unused | |
2990 | * @type: unused | |
2991 | * @mode: unused | |
2992 | * | |
2993 | * Returns 0 if current has read and write access, error code otherwise | |
2994 | */ | |
2995 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2996 | struct task_struct *target, long type, int mode) | |
2997 | { | |
ecfcc53f | 2998 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2999 | } |
3000 | ||
3001 | /** | |
3002 | * smack_ipc_permission - Smack access for ipc_permission() | |
3003 | * @ipp: the object permissions | |
3004 | * @flag: access requested | |
3005 | * | |
3006 | * Returns 0 if current has read and write access, error code otherwise | |
3007 | */ | |
3008 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3009 | { | |
21c7eae2 | 3010 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3011 | int may = smack_flags_to_may(flag); |
3012 | struct smk_audit_info ad; | |
d166c802 | 3013 | int rc; |
e114e473 | 3014 | |
ecfcc53f EB |
3015 | #ifdef CONFIG_AUDIT |
3016 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3017 | ad.a.u.ipc_id = ipp->id; | |
3018 | #endif | |
21c7eae2 LP |
3019 | rc = smk_curacc(iskp, may, &ad); |
3020 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3021 | return rc; |
e114e473 CS |
3022 | } |
3023 | ||
d20bdda6 AD |
3024 | /** |
3025 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3026 | * @ipp: the object permissions |
d20bdda6 AD |
3027 | * @secid: where result will be saved |
3028 | */ | |
3029 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3030 | { | |
21c7eae2 | 3031 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3032 | |
21c7eae2 | 3033 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3034 | } |
3035 | ||
e114e473 CS |
3036 | /** |
3037 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3038 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3039 | * @inode: the object |
3040 | * | |
3041 | * Set the inode's security blob if it hasn't been done already. | |
3042 | */ | |
3043 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3044 | { | |
3045 | struct super_block *sbp; | |
3046 | struct superblock_smack *sbsp; | |
3047 | struct inode_smack *isp; | |
2f823ff8 CS |
3048 | struct smack_known *skp; |
3049 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3050 | struct smack_known *final; |
5c6d1125 JS |
3051 | char trattr[TRANS_TRUE_SIZE]; |
3052 | int transflag = 0; | |
2267b13a | 3053 | int rc; |
e114e473 CS |
3054 | struct dentry *dp; |
3055 | ||
3056 | if (inode == NULL) | |
3057 | return; | |
3058 | ||
3059 | isp = inode->i_security; | |
3060 | ||
3061 | mutex_lock(&isp->smk_lock); | |
3062 | /* | |
3063 | * If the inode is already instantiated | |
3064 | * take the quick way out | |
3065 | */ | |
3066 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3067 | goto unlockandout; | |
3068 | ||
3069 | sbp = inode->i_sb; | |
3070 | sbsp = sbp->s_security; | |
3071 | /* | |
3072 | * We're going to use the superblock default label | |
3073 | * if there's no label on the file. | |
3074 | */ | |
3075 | final = sbsp->smk_default; | |
3076 | ||
e97dcb0e CS |
3077 | /* |
3078 | * If this is the root inode the superblock | |
3079 | * may be in the process of initialization. | |
3080 | * If that is the case use the root value out | |
3081 | * of the superblock. | |
3082 | */ | |
3083 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3084 | switch (sbp->s_magic) { |
3085 | case CGROUP_SUPER_MAGIC: | |
36ea735b CS |
3086 | /* |
3087 | * The cgroup filesystem is never mounted, | |
3088 | * so there's no opportunity to set the mount | |
3089 | * options. | |
3090 | */ | |
21c7eae2 LP |
3091 | sbsp->smk_root = &smack_known_star; |
3092 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3093 | isp->smk_inode = sbsp->smk_root; |
3094 | break; | |
3095 | case TMPFS_MAGIC: | |
3096 | /* | |
3097 | * What about shmem/tmpfs anonymous files with dentry | |
3098 | * obtained from d_alloc_pseudo()? | |
3099 | */ | |
3100 | isp->smk_inode = smk_of_current(); | |
3101 | break; | |
3102 | default: | |
3103 | isp->smk_inode = sbsp->smk_root; | |
3104 | break; | |
36ea735b | 3105 | } |
e97dcb0e CS |
3106 | isp->smk_flags |= SMK_INODE_INSTANT; |
3107 | goto unlockandout; | |
3108 | } | |
3109 | ||
e114e473 CS |
3110 | /* |
3111 | * This is pretty hackish. | |
3112 | * Casey says that we shouldn't have to do | |
3113 | * file system specific code, but it does help | |
3114 | * with keeping it simple. | |
3115 | */ | |
3116 | switch (sbp->s_magic) { | |
3117 | case SMACK_MAGIC: | |
36ea735b CS |
3118 | case PIPEFS_MAGIC: |
3119 | case SOCKFS_MAGIC: | |
3120 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 3121 | /* |
25985edc | 3122 | * Casey says that it's a little embarrassing |
e114e473 CS |
3123 | * that the smack file system doesn't do |
3124 | * extended attributes. | |
36ea735b | 3125 | * |
e114e473 | 3126 | * Casey says pipes are easy (?) |
36ea735b CS |
3127 | * |
3128 | * Socket access is controlled by the socket | |
3129 | * structures associated with the task involved. | |
3130 | * | |
3131 | * Cgroupfs is special | |
e114e473 | 3132 | */ |
21c7eae2 | 3133 | final = &smack_known_star; |
e114e473 CS |
3134 | break; |
3135 | case DEVPTS_SUPER_MAGIC: | |
3136 | /* | |
3137 | * devpts seems content with the label of the task. | |
3138 | * Programs that change smack have to treat the | |
3139 | * pty with respect. | |
3140 | */ | |
21c7eae2 | 3141 | final = ckp; |
e114e473 | 3142 | break; |
e114e473 CS |
3143 | case PROC_SUPER_MAGIC: |
3144 | /* | |
3145 | * Casey says procfs appears not to care. | |
3146 | * The superblock default suffices. | |
3147 | */ | |
3148 | break; | |
3149 | case TMPFS_MAGIC: | |
3150 | /* | |
3151 | * Device labels should come from the filesystem, | |
3152 | * but watch out, because they're volitile, | |
3153 | * getting recreated on every reboot. | |
3154 | */ | |
21c7eae2 | 3155 | final = &smack_known_star; |
e114e473 CS |
3156 | /* |
3157 | * No break. | |
3158 | * | |
3159 | * If a smack value has been set we want to use it, | |
3160 | * but since tmpfs isn't giving us the opportunity | |
3161 | * to set mount options simulate setting the | |
3162 | * superblock default. | |
3163 | */ | |
3164 | default: | |
3165 | /* | |
3166 | * This isn't an understood special case. | |
3167 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3168 | */ |
3169 | ||
3170 | /* | |
3171 | * UNIX domain sockets use lower level socket data. | |
3172 | */ | |
3173 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3174 | final = &smack_known_star; |
b4e0d5f0 CS |
3175 | break; |
3176 | } | |
3177 | /* | |
e114e473 CS |
3178 | * No xattr support means, alas, no SMACK label. |
3179 | * Use the aforeapplied default. | |
3180 | * It would be curious if the label of the task | |
3181 | * does not match that assigned. | |
3182 | */ | |
3183 | if (inode->i_op->getxattr == NULL) | |
3184 | break; | |
3185 | /* | |
3186 | * Get the dentry for xattr. | |
3187 | */ | |
3e62cbb8 | 3188 | dp = dget(opt_dentry); |
2f823ff8 | 3189 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3190 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3191 | final = skp; |
2267b13a CS |
3192 | |
3193 | /* | |
3194 | * Transmuting directory | |
3195 | */ | |
3196 | if (S_ISDIR(inode->i_mode)) { | |
3197 | /* | |
3198 | * If this is a new directory and the label was | |
3199 | * transmuted when the inode was initialized | |
3200 | * set the transmute attribute on the directory | |
3201 | * and mark the inode. | |
3202 | * | |
3203 | * If there is a transmute attribute on the | |
3204 | * directory mark the inode. | |
3205 | */ | |
3206 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3207 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
3208 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 3209 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3210 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3211 | 0); | |
3212 | } else { | |
3213 | rc = inode->i_op->getxattr(dp, | |
3214 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3215 | TRANS_TRUE_SIZE); | |
3216 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3217 | TRANS_TRUE_SIZE) != 0) | |
3218 | rc = -EINVAL; | |
5c6d1125 | 3219 | } |
2267b13a CS |
3220 | if (rc >= 0) |
3221 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3222 | } |
19760ad0 CS |
3223 | /* |
3224 | * Don't let the exec or mmap label be "*" or "@". | |
3225 | */ | |
3226 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
e774ad68 LP |
3227 | if (IS_ERR(skp) || skp == &smack_known_star || |
3228 | skp == &smack_known_web) | |
19760ad0 CS |
3229 | skp = NULL; |
3230 | isp->smk_task = skp; | |
e774ad68 | 3231 | |
19760ad0 | 3232 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3233 | if (IS_ERR(skp) || skp == &smack_known_star || |
3234 | skp == &smack_known_web) | |
19760ad0 CS |
3235 | skp = NULL; |
3236 | isp->smk_mmap = skp; | |
676dac4b | 3237 | |
e114e473 CS |
3238 | dput(dp); |
3239 | break; | |
3240 | } | |
3241 | ||
3242 | if (final == NULL) | |
21c7eae2 | 3243 | isp->smk_inode = ckp; |
e114e473 CS |
3244 | else |
3245 | isp->smk_inode = final; | |
3246 | ||
5c6d1125 | 3247 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3248 | |
3249 | unlockandout: | |
3250 | mutex_unlock(&isp->smk_lock); | |
3251 | return; | |
3252 | } | |
3253 | ||
3254 | /** | |
3255 | * smack_getprocattr - Smack process attribute access | |
3256 | * @p: the object task | |
3257 | * @name: the name of the attribute in /proc/.../attr | |
3258 | * @value: where to put the result | |
3259 | * | |
3260 | * Places a copy of the task Smack into value | |
3261 | * | |
3262 | * Returns the length of the smack label or an error code | |
3263 | */ | |
3264 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3265 | { | |
6d1cff2a | 3266 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3267 | char *cp; |
3268 | int slen; | |
3269 | ||
3270 | if (strcmp(name, "current") != 0) | |
3271 | return -EINVAL; | |
3272 | ||
2f823ff8 | 3273 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3274 | if (cp == NULL) |
3275 | return -ENOMEM; | |
3276 | ||
3277 | slen = strlen(cp); | |
3278 | *value = cp; | |
3279 | return slen; | |
3280 | } | |
3281 | ||
3282 | /** | |
3283 | * smack_setprocattr - Smack process attribute setting | |
3284 | * @p: the object task | |
3285 | * @name: the name of the attribute in /proc/.../attr | |
3286 | * @value: the value to set | |
3287 | * @size: the size of the value | |
3288 | * | |
3289 | * Sets the Smack value of the task. Only setting self | |
3290 | * is permitted and only with privilege | |
3291 | * | |
3292 | * Returns the length of the smack label or an error code | |
3293 | */ | |
3294 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3295 | void *value, size_t size) | |
3296 | { | |
676dac4b | 3297 | struct task_smack *tsp; |
d84f4f99 | 3298 | struct cred *new; |
2f823ff8 | 3299 | struct smack_known *skp; |
e114e473 | 3300 | |
e114e473 CS |
3301 | /* |
3302 | * Changing another process' Smack value is too dangerous | |
3303 | * and supports no sane use case. | |
3304 | */ | |
3305 | if (p != current) | |
3306 | return -EPERM; | |
3307 | ||
1880eff7 | 3308 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3309 | return -EPERM; |
3310 | ||
f7112e6c | 3311 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3312 | return -EINVAL; |
3313 | ||
3314 | if (strcmp(name, "current") != 0) | |
3315 | return -EINVAL; | |
3316 | ||
2f823ff8 | 3317 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3318 | if (IS_ERR(skp)) |
3319 | return PTR_ERR(skp); | |
e114e473 | 3320 | |
6d3dc07c CS |
3321 | /* |
3322 | * No process is ever allowed the web ("@") label. | |
3323 | */ | |
2f823ff8 | 3324 | if (skp == &smack_known_web) |
6d3dc07c CS |
3325 | return -EPERM; |
3326 | ||
d84f4f99 | 3327 | new = prepare_creds(); |
6d3dc07c | 3328 | if (new == NULL) |
d84f4f99 | 3329 | return -ENOMEM; |
7898e1f8 | 3330 | |
46a2f3b9 | 3331 | tsp = new->security; |
2f823ff8 | 3332 | tsp->smk_task = skp; |
7898e1f8 | 3333 | |
d84f4f99 | 3334 | commit_creds(new); |
e114e473 CS |
3335 | return size; |
3336 | } | |
3337 | ||
3338 | /** | |
3339 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3340 | * @sock: one sock |
3341 | * @other: the other sock | |
e114e473 CS |
3342 | * @newsk: unused |
3343 | * | |
3344 | * Return 0 if a subject with the smack of sock could access | |
3345 | * an object with the smack of other, otherwise an error code | |
3346 | */ | |
3610cda5 DM |
3347 | static int smack_unix_stream_connect(struct sock *sock, |
3348 | struct sock *other, struct sock *newsk) | |
e114e473 | 3349 | { |
2f823ff8 | 3350 | struct smack_known *skp; |
54e70ec5 | 3351 | struct smack_known *okp; |
d2e7ad19 JM |
3352 | struct socket_smack *ssp = sock->sk_security; |
3353 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3354 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3355 | struct smk_audit_info ad; |
b4e0d5f0 | 3356 | int rc = 0; |
923e9a13 KC |
3357 | #ifdef CONFIG_AUDIT |
3358 | struct lsm_network_audit net; | |
923e9a13 | 3359 | #endif |
b4e0d5f0 | 3360 | |
2f823ff8 CS |
3361 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3362 | skp = ssp->smk_out; | |
96be7b54 | 3363 | okp = osp->smk_in; |
54e70ec5 CS |
3364 | #ifdef CONFIG_AUDIT |
3365 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3366 | smk_ad_setfield_u_net_sk(&ad, other); | |
3367 | #endif | |
21c7eae2 LP |
3368 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3369 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3370 | if (rc == 0) { |
96be7b54 ZJ |
3371 | okp = osp->smk_out; |
3372 | skp = ssp->smk_in; | |
138a868f | 3373 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3374 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3375 | MAY_WRITE, rc); |
3376 | } | |
2f823ff8 | 3377 | } |
b4e0d5f0 | 3378 | |
975d5e55 CS |
3379 | /* |
3380 | * Cross reference the peer labels for SO_PEERSEC. | |
3381 | */ | |
3382 | if (rc == 0) { | |
54e70ec5 CS |
3383 | nsp->smk_packet = ssp->smk_out; |
3384 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3385 | } |
3386 | ||
b4e0d5f0 | 3387 | return rc; |
e114e473 CS |
3388 | } |
3389 | ||
3390 | /** | |
3391 | * smack_unix_may_send - Smack access on UDS | |
3392 | * @sock: one socket | |
3393 | * @other: the other socket | |
3394 | * | |
3395 | * Return 0 if a subject with the smack of sock could access | |
3396 | * an object with the smack of other, otherwise an error code | |
3397 | */ | |
3398 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3399 | { | |
b4e0d5f0 CS |
3400 | struct socket_smack *ssp = sock->sk->sk_security; |
3401 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3402 | struct smk_audit_info ad; |
d166c802 | 3403 | int rc; |
e114e473 | 3404 | |
923e9a13 KC |
3405 | #ifdef CONFIG_AUDIT |
3406 | struct lsm_network_audit net; | |
3407 | ||
48c62af6 | 3408 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3409 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3410 | #endif |
b4e0d5f0 | 3411 | |
2f823ff8 CS |
3412 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3413 | return 0; | |
b4e0d5f0 | 3414 | |
21c7eae2 LP |
3415 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3416 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3417 | return rc; |
e114e473 CS |
3418 | } |
3419 | ||
6d3dc07c CS |
3420 | /** |
3421 | * smack_socket_sendmsg - Smack check based on destination host | |
3422 | * @sock: the socket | |
251a2a95 | 3423 | * @msg: the message |
6d3dc07c CS |
3424 | * @size: the size of the message |
3425 | * | |
c6739443 CS |
3426 | * Return 0 if the current subject can write to the destination host. |
3427 | * For IPv4 this is only a question if the destination is a single label host. | |
3428 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3429 | */ |
3430 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3431 | int size) | |
3432 | { | |
3433 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
69f287ae | 3434 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
6ea06247 | 3435 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
69f287ae | 3436 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 | 3437 | int rc = 0; |
6d3dc07c CS |
3438 | |
3439 | /* | |
3440 | * Perfectly reasonable for this to be NULL | |
3441 | */ | |
c6739443 | 3442 | if (sip == NULL) |
6d3dc07c CS |
3443 | return 0; |
3444 | ||
c6739443 CS |
3445 | switch (sip->sin_family) { |
3446 | case AF_INET: | |
3447 | rc = smack_netlabel_send(sock->sk, sip); | |
3448 | break; | |
3449 | case AF_INET6: | |
69f287ae | 3450 | #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
c6739443 | 3451 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
69f287ae | 3452 | #endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */ |
c6739443 CS |
3453 | break; |
3454 | } | |
3455 | return rc; | |
6d3dc07c CS |
3456 | } |
3457 | ||
e114e473 | 3458 | /** |
251a2a95 | 3459 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3460 | * @sap: netlabel secattr |
272cd7a8 | 3461 | * @ssp: socket security information |
e114e473 | 3462 | * |
2f823ff8 | 3463 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3464 | */ |
2f823ff8 CS |
3465 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3466 | struct socket_smack *ssp) | |
e114e473 | 3467 | { |
2f823ff8 | 3468 | struct smack_known *skp; |
f7112e6c | 3469 | int found = 0; |
677264e8 CS |
3470 | int acat; |
3471 | int kcat; | |
e114e473 | 3472 | |
6d3dc07c | 3473 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3474 | /* |
6d3dc07c | 3475 | * Looks like a CIPSO packet. |
e114e473 CS |
3476 | * If there are flags but no level netlabel isn't |
3477 | * behaving the way we expect it to. | |
3478 | * | |
f7112e6c | 3479 | * Look it up in the label table |
e114e473 CS |
3480 | * Without guidance regarding the smack value |
3481 | * for the packet fall back on the network | |
3482 | * ambient value. | |
3483 | */ | |
f7112e6c | 3484 | rcu_read_lock(); |
2f823ff8 CS |
3485 | list_for_each_entry(skp, &smack_known_list, list) { |
3486 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3487 | continue; |
677264e8 CS |
3488 | /* |
3489 | * Compare the catsets. Use the netlbl APIs. | |
3490 | */ | |
3491 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3492 | if ((skp->smk_netlabel.flags & | |
3493 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3494 | found = 1; | |
3495 | break; | |
3496 | } | |
3497 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3498 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3499 | acat + 1); | |
3500 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3501 | skp->smk_netlabel.attr.mls.cat, |
3502 | kcat + 1); | |
3503 | if (acat < 0 || kcat < 0) | |
3504 | break; | |
3505 | } | |
3506 | if (acat == kcat) { | |
3507 | found = 1; | |
3508 | break; | |
3509 | } | |
6d3dc07c | 3510 | } |
f7112e6c CS |
3511 | rcu_read_unlock(); |
3512 | ||
3513 | if (found) | |
2f823ff8 | 3514 | return skp; |
f7112e6c | 3515 | |
54e70ec5 | 3516 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3517 | return &smack_known_web; |
3518 | return &smack_known_star; | |
e114e473 | 3519 | } |
6d3dc07c CS |
3520 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3521 | /* | |
3522 | * Looks like a fallback, which gives us a secid. | |
3523 | */ | |
2f823ff8 | 3524 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3525 | /* |
3526 | * This has got to be a bug because it is | |
3527 | * impossible to specify a fallback without | |
3528 | * specifying the label, which will ensure | |
3529 | * it has a secid, and the only way to get a | |
3530 | * secid is from a fallback. | |
3531 | */ | |
2f823ff8 CS |
3532 | BUG_ON(skp == NULL); |
3533 | return skp; | |
e114e473 CS |
3534 | } |
3535 | /* | |
6d3dc07c CS |
3536 | * Without guidance regarding the smack value |
3537 | * for the packet fall back on the network | |
3538 | * ambient value. | |
e114e473 | 3539 | */ |
272cd7a8 | 3540 | return smack_net_ambient; |
e114e473 CS |
3541 | } |
3542 | ||
69f287ae | 3543 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3544 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3545 | { |
c6739443 CS |
3546 | u8 nexthdr; |
3547 | int offset; | |
3548 | int proto = -EINVAL; | |
3549 | struct ipv6hdr _ipv6h; | |
3550 | struct ipv6hdr *ip6; | |
3551 | __be16 frag_off; | |
3552 | struct tcphdr _tcph, *th; | |
3553 | struct udphdr _udph, *uh; | |
3554 | struct dccp_hdr _dccph, *dh; | |
3555 | ||
3556 | sip->sin6_port = 0; | |
3557 | ||
3558 | offset = skb_network_offset(skb); | |
3559 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3560 | if (ip6 == NULL) | |
3561 | return -EINVAL; | |
3562 | sip->sin6_addr = ip6->saddr; | |
3563 | ||
3564 | nexthdr = ip6->nexthdr; | |
3565 | offset += sizeof(_ipv6h); | |
3566 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3567 | if (offset < 0) | |
3568 | return -EINVAL; | |
3569 | ||
3570 | proto = nexthdr; | |
3571 | switch (proto) { | |
3572 | case IPPROTO_TCP: | |
3573 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3574 | if (th != NULL) | |
3575 | sip->sin6_port = th->source; | |
3576 | break; | |
3577 | case IPPROTO_UDP: | |
3578 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3579 | if (uh != NULL) | |
3580 | sip->sin6_port = uh->source; | |
3581 | break; | |
3582 | case IPPROTO_DCCP: | |
3583 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3584 | if (dh != NULL) | |
3585 | sip->sin6_port = dh->dccph_sport; | |
3586 | break; | |
3587 | } | |
3588 | return proto; | |
3589 | } | |
69f287ae | 3590 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3591 | |
e114e473 CS |
3592 | /** |
3593 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3594 | * @sk: socket | |
3595 | * @skb: packet | |
3596 | * | |
3597 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3598 | */ | |
3599 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3600 | { | |
3601 | struct netlbl_lsm_secattr secattr; | |
3602 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3603 | struct smack_known *skp = NULL; |
c6739443 | 3604 | int rc = 0; |
ecfcc53f | 3605 | struct smk_audit_info ad; |
923e9a13 | 3606 | #ifdef CONFIG_AUDIT |
48c62af6 | 3607 | struct lsm_network_audit net; |
923e9a13 | 3608 | #endif |
69f287ae CS |
3609 | #if IS_ENABLED(CONFIG_IPV6) |
3610 | struct sockaddr_in6 sadd; | |
3611 | int proto; | |
3612 | #endif /* CONFIG_IPV6 */ | |
3613 | ||
c6739443 CS |
3614 | switch (sk->sk_family) { |
3615 | case PF_INET: | |
69f287ae CS |
3616 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3617 | /* | |
3618 | * If there is a secmark use it rather than the CIPSO label. | |
3619 | * If there is no secmark fall back to CIPSO. | |
3620 | * The secmark is assumed to reflect policy better. | |
3621 | */ | |
3622 | if (skb && skb->secmark != 0) { | |
3623 | skp = smack_from_secid(skb->secmark); | |
3624 | goto access_check; | |
3625 | } | |
3626 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3627 | /* |
3628 | * Translate what netlabel gave us. | |
3629 | */ | |
3630 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3631 | |
c6739443 CS |
3632 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3633 | if (rc == 0) | |
2f823ff8 | 3634 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3635 | else |
2f823ff8 | 3636 | skp = smack_net_ambient; |
6d3dc07c | 3637 | |
c6739443 | 3638 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3639 | |
69f287ae CS |
3640 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3641 | access_check: | |
3642 | #endif | |
ecfcc53f | 3643 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3644 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3645 | ad.a.u.net->family = sk->sk_family; | |
3646 | ad.a.u.net->netif = skb->skb_iif; | |
3647 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3648 | #endif |
c6739443 CS |
3649 | /* |
3650 | * Receiving a packet requires that the other end | |
3651 | * be able to write here. Read access is not required. | |
3652 | * This is the simplist possible security model | |
3653 | * for networking. | |
3654 | */ | |
21c7eae2 LP |
3655 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3656 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3657 | MAY_WRITE, rc); |
c6739443 CS |
3658 | if (rc != 0) |
3659 | netlbl_skbuff_err(skb, rc, 0); | |
3660 | break; | |
69f287ae | 3661 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3662 | case PF_INET6: |
69f287ae CS |
3663 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
3664 | if (proto != IPPROTO_UDP && proto != IPPROTO_TCP) | |
3665 | break; | |
3666 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
3667 | if (skb && skb->secmark != 0) | |
3668 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 3669 | else |
69f287ae CS |
3670 | skp = smack_net_ambient; |
3671 | #ifdef CONFIG_AUDIT | |
3672 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3673 | ad.a.u.net->family = sk->sk_family; | |
3674 | ad.a.u.net->netif = skb->skb_iif; | |
3675 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
3676 | #endif /* CONFIG_AUDIT */ | |
3677 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
3678 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
3679 | MAY_WRITE, rc); | |
3680 | #else /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
3681 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3682 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 | 3683 | break; |
69f287ae | 3684 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3685 | } |
69f287ae | 3686 | |
a8134296 | 3687 | return rc; |
e114e473 CS |
3688 | } |
3689 | ||
3690 | /** | |
3691 | * smack_socket_getpeersec_stream - pull in packet label | |
3692 | * @sock: the socket | |
3693 | * @optval: user's destination | |
3694 | * @optlen: size thereof | |
251a2a95 | 3695 | * @len: max thereof |
e114e473 CS |
3696 | * |
3697 | * returns zero on success, an error code otherwise | |
3698 | */ | |
3699 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3700 | char __user *optval, | |
3701 | int __user *optlen, unsigned len) | |
3702 | { | |
3703 | struct socket_smack *ssp; | |
272cd7a8 CS |
3704 | char *rcp = ""; |
3705 | int slen = 1; | |
e114e473 CS |
3706 | int rc = 0; |
3707 | ||
3708 | ssp = sock->sk->sk_security; | |
272cd7a8 | 3709 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 3710 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
3711 | slen = strlen(rcp) + 1; |
3712 | } | |
e114e473 CS |
3713 | |
3714 | if (slen > len) | |
3715 | rc = -ERANGE; | |
272cd7a8 | 3716 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3717 | rc = -EFAULT; |
3718 | ||
3719 | if (put_user(slen, optlen) != 0) | |
3720 | rc = -EFAULT; | |
3721 | ||
3722 | return rc; | |
3723 | } | |
3724 | ||
3725 | ||
3726 | /** | |
3727 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3728 | * @sock: the peer socket |
e114e473 CS |
3729 | * @skb: packet data |
3730 | * @secid: pointer to where to put the secid of the packet | |
3731 | * | |
3732 | * Sets the netlabel socket state on sk from parent | |
3733 | */ | |
3734 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3735 | struct sk_buff *skb, u32 *secid) | |
3736 | ||
3737 | { | |
3738 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3739 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3740 | struct smack_known *skp; |
b4e0d5f0 CS |
3741 | int family = PF_UNSPEC; |
3742 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3743 | int rc; |
3744 | ||
b4e0d5f0 CS |
3745 | if (skb != NULL) { |
3746 | if (skb->protocol == htons(ETH_P_IP)) | |
3747 | family = PF_INET; | |
69f287ae | 3748 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
3749 | else if (skb->protocol == htons(ETH_P_IPV6)) |
3750 | family = PF_INET6; | |
69f287ae | 3751 | #endif /* CONFIG_IPV6 */ |
e114e473 | 3752 | } |
b4e0d5f0 CS |
3753 | if (family == PF_UNSPEC && sock != NULL) |
3754 | family = sock->sk->sk_family; | |
e114e473 | 3755 | |
69f287ae CS |
3756 | switch (family) { |
3757 | case PF_UNIX: | |
272cd7a8 | 3758 | ssp = sock->sk->sk_security; |
2f823ff8 | 3759 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
3760 | break; |
3761 | case PF_INET: | |
3762 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
3763 | s = skb->secmark; | |
3764 | if (s != 0) | |
3765 | break; | |
3766 | #endif | |
b4e0d5f0 CS |
3767 | /* |
3768 | * Translate what netlabel gave us. | |
3769 | */ | |
272cd7a8 CS |
3770 | if (sock != NULL && sock->sk != NULL) |
3771 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3772 | netlbl_secattr_init(&secattr); |
3773 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3774 | if (rc == 0) { | |
2f823ff8 CS |
3775 | skp = smack_from_secattr(&secattr, ssp); |
3776 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3777 | } |
3778 | netlbl_secattr_destroy(&secattr); | |
69f287ae CS |
3779 | break; |
3780 | #if IS_ENABLED(CONFIG_IPV6) | |
3781 | case PF_INET6: | |
3782 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
3783 | s = skb->secmark; | |
3784 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
3785 | break; | |
3786 | #endif /* CONFIG_IPV6 */ | |
b4e0d5f0 CS |
3787 | } |
3788 | *secid = s; | |
e114e473 CS |
3789 | if (s == 0) |
3790 | return -EINVAL; | |
e114e473 CS |
3791 | return 0; |
3792 | } | |
3793 | ||
3794 | /** | |
07feee8f PM |
3795 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3796 | * @sk: child sock | |
3797 | * @parent: parent socket | |
e114e473 | 3798 | * |
07feee8f PM |
3799 | * Set the smk_{in,out} state of an existing sock based on the process that |
3800 | * is creating the new socket. | |
e114e473 CS |
3801 | */ |
3802 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3803 | { | |
3804 | struct socket_smack *ssp; | |
2f823ff8 | 3805 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3806 | |
07feee8f PM |
3807 | if (sk == NULL || |
3808 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3809 | return; |
3810 | ||
3811 | ssp = sk->sk_security; | |
54e70ec5 | 3812 | ssp->smk_in = skp; |
2f823ff8 | 3813 | ssp->smk_out = skp; |
07feee8f | 3814 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3815 | } |
3816 | ||
3817 | /** | |
3818 | * smack_inet_conn_request - Smack access check on connect | |
3819 | * @sk: socket involved | |
3820 | * @skb: packet | |
3821 | * @req: unused | |
3822 | * | |
3823 | * Returns 0 if a task with the packet label could write to | |
3824 | * the socket, otherwise an error code | |
3825 | */ | |
3826 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3827 | struct request_sock *req) | |
3828 | { | |
07feee8f | 3829 | u16 family = sk->sk_family; |
f7112e6c | 3830 | struct smack_known *skp; |
e114e473 | 3831 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3832 | struct netlbl_lsm_secattr secattr; |
3833 | struct sockaddr_in addr; | |
3834 | struct iphdr *hdr; | |
21c7eae2 | 3835 | struct smack_known *hskp; |
e114e473 | 3836 | int rc; |
ecfcc53f | 3837 | struct smk_audit_info ad; |
923e9a13 | 3838 | #ifdef CONFIG_AUDIT |
48c62af6 | 3839 | struct lsm_network_audit net; |
923e9a13 | 3840 | #endif |
e114e473 | 3841 | |
69f287ae | 3842 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
3843 | if (family == PF_INET6) { |
3844 | /* | |
3845 | * Handle mapped IPv4 packets arriving | |
3846 | * via IPv6 sockets. Don't set up netlabel | |
3847 | * processing on IPv6. | |
3848 | */ | |
3849 | if (skb->protocol == htons(ETH_P_IP)) | |
3850 | family = PF_INET; | |
3851 | else | |
3852 | return 0; | |
3853 | } | |
69f287ae | 3854 | #endif /* CONFIG_IPV6 */ |
e114e473 | 3855 | |
7f368ad3 CS |
3856 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3857 | /* | |
3858 | * If there is a secmark use it rather than the CIPSO label. | |
3859 | * If there is no secmark fall back to CIPSO. | |
3860 | * The secmark is assumed to reflect policy better. | |
3861 | */ | |
3862 | if (skb && skb->secmark != 0) { | |
3863 | skp = smack_from_secid(skb->secmark); | |
3864 | goto access_check; | |
3865 | } | |
3866 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
3867 | ||
07feee8f PM |
3868 | netlbl_secattr_init(&secattr); |
3869 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3870 | if (rc == 0) |
2f823ff8 | 3871 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3872 | else |
2f823ff8 | 3873 | skp = &smack_known_huh; |
07feee8f PM |
3874 | netlbl_secattr_destroy(&secattr); |
3875 | ||
7f368ad3 CS |
3876 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3877 | access_check: | |
3878 | #endif | |
3879 | ||
ecfcc53f | 3880 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3881 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3882 | ad.a.u.net->family = family; | |
3883 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3884 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3885 | #endif | |
e114e473 | 3886 | /* |
07feee8f PM |
3887 | * Receiving a packet requires that the other end be able to write |
3888 | * here. Read access is not required. | |
e114e473 | 3889 | */ |
21c7eae2 LP |
3890 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3891 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
3892 | if (rc != 0) |
3893 | return rc; | |
3894 | ||
3895 | /* | |
3896 | * Save the peer's label in the request_sock so we can later setup | |
3897 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3898 | */ | |
2f823ff8 | 3899 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3900 | |
3901 | /* | |
3902 | * We need to decide if we want to label the incoming connection here | |
3903 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3904 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3905 | */ |
3906 | hdr = ip_hdr(skb); | |
3907 | addr.sin_addr.s_addr = hdr->saddr; | |
3908 | rcu_read_lock(); | |
21c7eae2 | 3909 | hskp = smack_host_label(&addr); |
f7112e6c CS |
3910 | rcu_read_unlock(); |
3911 | ||
21c7eae2 | 3912 | if (hskp == NULL) |
f7112e6c | 3913 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3914 | else |
07feee8f | 3915 | netlbl_req_delattr(req); |
e114e473 CS |
3916 | |
3917 | return rc; | |
3918 | } | |
3919 | ||
07feee8f PM |
3920 | /** |
3921 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3922 | * @sk: the new socket | |
3923 | * @req: the connection's request_sock | |
3924 | * | |
3925 | * Transfer the connection's peer label to the newly created socket. | |
3926 | */ | |
3927 | static void smack_inet_csk_clone(struct sock *sk, | |
3928 | const struct request_sock *req) | |
3929 | { | |
3930 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3931 | struct smack_known *skp; |
07feee8f | 3932 | |
2f823ff8 CS |
3933 | if (req->peer_secid != 0) { |
3934 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 3935 | ssp->smk_packet = skp; |
2f823ff8 | 3936 | } else |
272cd7a8 | 3937 | ssp->smk_packet = NULL; |
07feee8f PM |
3938 | } |
3939 | ||
e114e473 CS |
3940 | /* |
3941 | * Key management security hooks | |
3942 | * | |
3943 | * Casey has not tested key support very heavily. | |
3944 | * The permission check is most likely too restrictive. | |
3945 | * If you care about keys please have a look. | |
3946 | */ | |
3947 | #ifdef CONFIG_KEYS | |
3948 | ||
3949 | /** | |
3950 | * smack_key_alloc - Set the key security blob | |
3951 | * @key: object | |
d84f4f99 | 3952 | * @cred: the credentials to use |
e114e473 CS |
3953 | * @flags: unused |
3954 | * | |
3955 | * No allocation required | |
3956 | * | |
3957 | * Returns 0 | |
3958 | */ | |
d84f4f99 | 3959 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3960 | unsigned long flags) |
3961 | { | |
2f823ff8 CS |
3962 | struct smack_known *skp = smk_of_task(cred->security); |
3963 | ||
21c7eae2 | 3964 | key->security = skp; |
e114e473 CS |
3965 | return 0; |
3966 | } | |
3967 | ||
3968 | /** | |
3969 | * smack_key_free - Clear the key security blob | |
3970 | * @key: the object | |
3971 | * | |
3972 | * Clear the blob pointer | |
3973 | */ | |
3974 | static void smack_key_free(struct key *key) | |
3975 | { | |
3976 | key->security = NULL; | |
3977 | } | |
3978 | ||
1a28979b | 3979 | /** |
e114e473 CS |
3980 | * smack_key_permission - Smack access on a key |
3981 | * @key_ref: gets to the object | |
d84f4f99 | 3982 | * @cred: the credentials to use |
1a28979b | 3983 | * @perm: requested key permissions |
e114e473 CS |
3984 | * |
3985 | * Return 0 if the task has read and write to the object, | |
3986 | * an error code otherwise | |
3987 | */ | |
3988 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 3989 | const struct cred *cred, unsigned perm) |
e114e473 CS |
3990 | { |
3991 | struct key *keyp; | |
ecfcc53f | 3992 | struct smk_audit_info ad; |
2f823ff8 | 3993 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 3994 | int request = 0; |
d166c802 | 3995 | int rc; |
e114e473 CS |
3996 | |
3997 | keyp = key_ref_to_ptr(key_ref); | |
3998 | if (keyp == NULL) | |
3999 | return -EINVAL; | |
4000 | /* | |
4001 | * If the key hasn't been initialized give it access so that | |
4002 | * it may do so. | |
4003 | */ | |
4004 | if (keyp->security == NULL) | |
4005 | return 0; | |
4006 | /* | |
4007 | * This should not occur | |
4008 | */ | |
2f823ff8 | 4009 | if (tkp == NULL) |
e114e473 | 4010 | return -EACCES; |
ecfcc53f EB |
4011 | #ifdef CONFIG_AUDIT |
4012 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4013 | ad.a.u.key_struct.key = keyp->serial; | |
4014 | ad.a.u.key_struct.key_desc = keyp->description; | |
4015 | #endif | |
fffea214 DK |
4016 | if (perm & KEY_NEED_READ) |
4017 | request = MAY_READ; | |
4018 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4019 | request = MAY_WRITE; | |
d166c802 CS |
4020 | rc = smk_access(tkp, keyp->security, request, &ad); |
4021 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4022 | return rc; | |
e114e473 | 4023 | } |
7fc5f36e JB |
4024 | |
4025 | /* | |
4026 | * smack_key_getsecurity - Smack label tagging the key | |
4027 | * @key points to the key to be queried | |
4028 | * @_buffer points to a pointer that should be set to point to the | |
4029 | * resulting string (if no label or an error occurs). | |
4030 | * Return the length of the string (including terminating NUL) or -ve if | |
4031 | * an error. | |
4032 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4033 | */ | |
4034 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4035 | { | |
4036 | struct smack_known *skp = key->security; | |
4037 | size_t length; | |
4038 | char *copy; | |
4039 | ||
4040 | if (key->security == NULL) { | |
4041 | *_buffer = NULL; | |
4042 | return 0; | |
4043 | } | |
4044 | ||
4045 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4046 | if (copy == NULL) | |
4047 | return -ENOMEM; | |
4048 | length = strlen(copy) + 1; | |
4049 | ||
4050 | *_buffer = copy; | |
4051 | return length; | |
4052 | } | |
4053 | ||
e114e473 CS |
4054 | #endif /* CONFIG_KEYS */ |
4055 | ||
d20bdda6 AD |
4056 | /* |
4057 | * Smack Audit hooks | |
4058 | * | |
4059 | * Audit requires a unique representation of each Smack specific | |
4060 | * rule. This unique representation is used to distinguish the | |
4061 | * object to be audited from remaining kernel objects and also | |
4062 | * works as a glue between the audit hooks. | |
4063 | * | |
4064 | * Since repository entries are added but never deleted, we'll use | |
4065 | * the smack_known label address related to the given audit rule as | |
4066 | * the needed unique representation. This also better fits the smack | |
4067 | * model where nearly everything is a label. | |
4068 | */ | |
4069 | #ifdef CONFIG_AUDIT | |
4070 | ||
4071 | /** | |
4072 | * smack_audit_rule_init - Initialize a smack audit rule | |
4073 | * @field: audit rule fields given from user-space (audit.h) | |
4074 | * @op: required testing operator (=, !=, >, <, ...) | |
4075 | * @rulestr: smack label to be audited | |
4076 | * @vrule: pointer to save our own audit rule representation | |
4077 | * | |
4078 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4079 | * The label to be audited is created if necessay. | |
4080 | */ | |
4081 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4082 | { | |
21c7eae2 | 4083 | struct smack_known *skp; |
d20bdda6 AD |
4084 | char **rule = (char **)vrule; |
4085 | *rule = NULL; | |
4086 | ||
4087 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4088 | return -EINVAL; | |
4089 | ||
5af75d8d | 4090 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4091 | return -EINVAL; |
4092 | ||
21c7eae2 | 4093 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4094 | if (IS_ERR(skp)) |
4095 | return PTR_ERR(skp); | |
4096 | ||
4097 | *rule = skp->smk_known; | |
d20bdda6 AD |
4098 | |
4099 | return 0; | |
4100 | } | |
4101 | ||
4102 | /** | |
4103 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4104 | * @krule: rule of interest, in Audit kernel representation format | |
4105 | * | |
4106 | * This is used to filter Smack rules from remaining Audit ones. | |
4107 | * If it's proved that this rule belongs to us, the | |
4108 | * audit_rule_match hook will be called to do the final judgement. | |
4109 | */ | |
4110 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4111 | { | |
4112 | struct audit_field *f; | |
4113 | int i; | |
4114 | ||
4115 | for (i = 0; i < krule->field_count; i++) { | |
4116 | f = &krule->fields[i]; | |
4117 | ||
4118 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4119 | return 1; | |
4120 | } | |
4121 | ||
4122 | return 0; | |
4123 | } | |
4124 | ||
4125 | /** | |
4126 | * smack_audit_rule_match - Audit given object ? | |
4127 | * @secid: security id for identifying the object to test | |
4128 | * @field: audit rule flags given from user-space | |
4129 | * @op: required testing operator | |
4130 | * @vrule: smack internal rule presentation | |
4131 | * @actx: audit context associated with the check | |
4132 | * | |
4133 | * The core Audit hook. It's used to take the decision of | |
4134 | * whether to audit or not to audit a given object. | |
4135 | */ | |
4136 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4137 | struct audit_context *actx) | |
4138 | { | |
2f823ff8 | 4139 | struct smack_known *skp; |
d20bdda6 AD |
4140 | char *rule = vrule; |
4141 | ||
4eb0f4ab RGB |
4142 | if (unlikely(!rule)) { |
4143 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4144 | return -ENOENT; |
4145 | } | |
4146 | ||
4147 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4148 | return 0; | |
4149 | ||
2f823ff8 | 4150 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4151 | |
4152 | /* | |
4153 | * No need to do string comparisons. If a match occurs, | |
4154 | * both pointers will point to the same smack_known | |
4155 | * label. | |
4156 | */ | |
5af75d8d | 4157 | if (op == Audit_equal) |
2f823ff8 | 4158 | return (rule == skp->smk_known); |
5af75d8d | 4159 | if (op == Audit_not_equal) |
2f823ff8 | 4160 | return (rule != skp->smk_known); |
d20bdda6 AD |
4161 | |
4162 | return 0; | |
4163 | } | |
4164 | ||
4165 | /** | |
4166 | * smack_audit_rule_free - free smack rule representation | |
4167 | * @vrule: rule to be freed. | |
4168 | * | |
4169 | * No memory was allocated. | |
4170 | */ | |
4171 | static void smack_audit_rule_free(void *vrule) | |
4172 | { | |
4173 | /* No-op */ | |
4174 | } | |
4175 | ||
4176 | #endif /* CONFIG_AUDIT */ | |
4177 | ||
746df9b5 DQ |
4178 | /** |
4179 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4180 | * @name: Full xattr name to check. | |
4181 | */ | |
4182 | static int smack_ismaclabel(const char *name) | |
4183 | { | |
4184 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4185 | } | |
4186 | ||
4187 | ||
251a2a95 | 4188 | /** |
e114e473 CS |
4189 | * smack_secid_to_secctx - return the smack label for a secid |
4190 | * @secid: incoming integer | |
4191 | * @secdata: destination | |
4192 | * @seclen: how long it is | |
4193 | * | |
4194 | * Exists for networking code. | |
4195 | */ | |
4196 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4197 | { | |
2f823ff8 | 4198 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4199 | |
d5630b9d | 4200 | if (secdata) |
2f823ff8 CS |
4201 | *secdata = skp->smk_known; |
4202 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4203 | return 0; |
4204 | } | |
4205 | ||
251a2a95 | 4206 | /** |
4bc87e62 CS |
4207 | * smack_secctx_to_secid - return the secid for a smack label |
4208 | * @secdata: smack label | |
4209 | * @seclen: how long result is | |
4210 | * @secid: outgoing integer | |
4211 | * | |
4212 | * Exists for audit and networking code. | |
4213 | */ | |
e52c1764 | 4214 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4215 | { |
21c7eae2 LP |
4216 | struct smack_known *skp = smk_find_entry(secdata); |
4217 | ||
4218 | if (skp) | |
4219 | *secid = skp->smk_secid; | |
4220 | else | |
4221 | *secid = 0; | |
4bc87e62 CS |
4222 | return 0; |
4223 | } | |
4224 | ||
251a2a95 | 4225 | /** |
e114e473 | 4226 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
4227 | * @secdata: unused |
4228 | * @seclen: unused | |
e114e473 CS |
4229 | * |
4230 | * Exists to make sure nothing gets done, and properly | |
4231 | */ | |
4232 | static void smack_release_secctx(char *secdata, u32 seclen) | |
4233 | { | |
4234 | } | |
4235 | ||
1ee65e37 DQ |
4236 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4237 | { | |
4238 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4239 | } | |
4240 | ||
4241 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4242 | { | |
4243 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4244 | } | |
4245 | ||
4246 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4247 | { | |
4248 | int len = 0; | |
4249 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4250 | ||
4251 | if (len < 0) | |
4252 | return len; | |
4253 | *ctxlen = len; | |
4254 | return 0; | |
4255 | } | |
4256 | ||
b1d9e6b0 | 4257 | struct security_hook_list smack_hooks[] = { |
e20b043a CS |
4258 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4259 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4260 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4261 | ||
4262 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4263 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
4264 | LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data), | |
4265 | LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount), | |
4266 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), | |
4267 | ||
4268 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
4269 | LSM_HOOK_INIT(bprm_committing_creds, smack_bprm_committing_creds), | |
4270 | LSM_HOOK_INIT(bprm_secureexec, smack_bprm_secureexec), | |
4271 | ||
4272 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4273 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4274 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4275 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4276 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4277 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4278 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4279 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4280 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4281 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4282 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4283 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4284 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4285 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4286 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4287 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4288 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4289 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4290 | ||
4291 | LSM_HOOK_INIT(file_permission, smack_file_permission), | |
4292 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), | |
4293 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4294 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4295 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4296 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4297 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4298 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4299 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4300 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4301 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4302 | ||
4303 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4304 | ||
4305 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4306 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4307 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4308 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
4309 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), | |
4310 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4311 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4312 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4313 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4314 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4315 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4316 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4317 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4318 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4319 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4320 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4321 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
4322 | LSM_HOOK_INIT(task_wait, smack_task_wait), | |
4323 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), | |
4324 | ||
4325 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4326 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4327 | ||
4328 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4329 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4330 | ||
4331 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security), | |
4332 | LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security), | |
4333 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), | |
4334 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4335 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4336 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4337 | ||
4338 | LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security), | |
4339 | LSM_HOOK_INIT(shm_free_security, smack_shm_free_security), | |
4340 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), | |
4341 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4342 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4343 | ||
4344 | LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security), | |
4345 | LSM_HOOK_INIT(sem_free_security, smack_sem_free_security), | |
4346 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), | |
4347 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4348 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4349 | ||
4350 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4351 | ||
4352 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4353 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4354 | ||
4355 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4356 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4357 | ||
4358 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
69f287ae | 4359 | #ifndef CONFIG_SECURITY_SMACK_NETFILTER |
e20b043a | 4360 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
69f287ae | 4361 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ |
e20b043a CS |
4362 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4363 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4364 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4365 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4366 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4367 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4368 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4369 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4370 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4371 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4372 | |
e114e473 CS |
4373 | /* key management security hooks */ |
4374 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4375 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4376 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4377 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4378 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4379 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4380 | |
4381 | /* Audit hooks */ | |
4382 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4383 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4384 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4385 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
4386 | LSM_HOOK_INIT(audit_rule_free, smack_audit_rule_free), | |
d20bdda6 AD |
4387 | #endif /* CONFIG_AUDIT */ |
4388 | ||
e20b043a CS |
4389 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4390 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4391 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
4392 | LSM_HOOK_INIT(release_secctx, smack_release_secctx), | |
4393 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), | |
4394 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4395 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
e114e473 CS |
4396 | }; |
4397 | ||
7198e2ee | 4398 | |
86812bb0 | 4399 | static __init void init_smack_known_list(void) |
7198e2ee | 4400 | { |
86812bb0 CS |
4401 | /* |
4402 | * Initialize rule list locks | |
4403 | */ | |
4404 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4405 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4406 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4407 | mutex_init(&smack_known_star.smk_rules_lock); | |
4408 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4409 | mutex_init(&smack_known_web.smk_rules_lock); | |
4410 | /* | |
4411 | * Initialize rule lists | |
4412 | */ | |
4413 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4414 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4415 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4416 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4417 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4418 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4419 | /* | |
4420 | * Create the known labels list | |
4421 | */ | |
4d7cf4a1 TS |
4422 | smk_insert_entry(&smack_known_huh); |
4423 | smk_insert_entry(&smack_known_hat); | |
4424 | smk_insert_entry(&smack_known_star); | |
4425 | smk_insert_entry(&smack_known_floor); | |
4426 | smk_insert_entry(&smack_known_invalid); | |
4427 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4428 | } |
4429 | ||
e114e473 CS |
4430 | /** |
4431 | * smack_init - initialize the smack system | |
4432 | * | |
4433 | * Returns 0 | |
4434 | */ | |
4435 | static __init int smack_init(void) | |
4436 | { | |
d84f4f99 | 4437 | struct cred *cred; |
676dac4b | 4438 | struct task_smack *tsp; |
d84f4f99 | 4439 | |
b1d9e6b0 | 4440 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4441 | return 0; |
4442 | ||
69f287ae CS |
4443 | smack_enabled = 1; |
4444 | ||
1a5b472b R |
4445 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4446 | if (!smack_inode_cache) | |
4447 | return -ENOMEM; | |
4448 | ||
2f823ff8 CS |
4449 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4450 | GFP_KERNEL); | |
1a5b472b R |
4451 | if (tsp == NULL) { |
4452 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4453 | return -ENOMEM; |
1a5b472b | 4454 | } |
676dac4b | 4455 | |
e114e473 CS |
4456 | printk(KERN_INFO "Smack: Initializing.\n"); |
4457 | ||
4458 | /* | |
4459 | * Set the security state for the initial task. | |
4460 | */ | |
d84f4f99 | 4461 | cred = (struct cred *) current->cred; |
676dac4b | 4462 | cred->security = tsp; |
e114e473 | 4463 | |
86812bb0 CS |
4464 | /* initialize the smack_known_list */ |
4465 | init_smack_known_list(); | |
e114e473 CS |
4466 | |
4467 | /* | |
4468 | * Register with LSM | |
4469 | */ | |
b1d9e6b0 | 4470 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks)); |
e114e473 CS |
4471 | |
4472 | return 0; | |
4473 | } | |
4474 | ||
4475 | /* | |
4476 | * Smack requires early initialization in order to label | |
4477 | * all processes and objects when they are created. | |
4478 | */ | |
4479 | security_initcall(smack_init); |