Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
e114e473 CS |
44 | #include "smack.h" |
45 | ||
c69e8d9c DH |
46 | #define task_security(task) (task_cred_xxx((task), security)) |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
55 | LIST_HEAD(smk_ipv6_port_list); | |
56 | ||
e114e473 CS |
57 | /** |
58 | * smk_fetch - Fetch the smack label from a file. | |
59 | * @ip: a pointer to the inode | |
60 | * @dp: a pointer to the dentry | |
61 | * | |
62 | * Returns a pointer to the master list entry for the Smack label | |
63 | * or NULL if there was no label to fetch. | |
64 | */ | |
2f823ff8 CS |
65 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
66 | struct dentry *dp) | |
e114e473 CS |
67 | { |
68 | int rc; | |
f7112e6c | 69 | char *buffer; |
2f823ff8 | 70 | struct smack_known *skp = NULL; |
e114e473 CS |
71 | |
72 | if (ip->i_op->getxattr == NULL) | |
73 | return NULL; | |
74 | ||
f7112e6c CS |
75 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
76 | if (buffer == NULL) | |
e114e473 CS |
77 | return NULL; |
78 | ||
f7112e6c CS |
79 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
80 | if (rc > 0) | |
2f823ff8 | 81 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
82 | |
83 | kfree(buffer); | |
84 | ||
2f823ff8 | 85 | return skp; |
e114e473 CS |
86 | } |
87 | ||
88 | /** | |
89 | * new_inode_smack - allocate an inode security blob | |
90 | * @smack: a pointer to the Smack label to use in the blob | |
91 | * | |
92 | * Returns the new blob or NULL if there's no memory available | |
93 | */ | |
94 | struct inode_smack *new_inode_smack(char *smack) | |
95 | { | |
96 | struct inode_smack *isp; | |
97 | ||
ceffec55 | 98 | isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); |
e114e473 CS |
99 | if (isp == NULL) |
100 | return NULL; | |
101 | ||
102 | isp->smk_inode = smack; | |
103 | isp->smk_flags = 0; | |
104 | mutex_init(&isp->smk_lock); | |
105 | ||
106 | return isp; | |
107 | } | |
108 | ||
7898e1f8 CS |
109 | /** |
110 | * new_task_smack - allocate a task security blob | |
111 | * @smack: a pointer to the Smack label to use in the blob | |
112 | * | |
113 | * Returns the new blob or NULL if there's no memory available | |
114 | */ | |
2f823ff8 CS |
115 | static struct task_smack *new_task_smack(struct smack_known *task, |
116 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
117 | { |
118 | struct task_smack *tsp; | |
119 | ||
120 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
121 | if (tsp == NULL) | |
122 | return NULL; | |
123 | ||
124 | tsp->smk_task = task; | |
125 | tsp->smk_forked = forked; | |
126 | INIT_LIST_HEAD(&tsp->smk_rules); | |
127 | mutex_init(&tsp->smk_rules_lock); | |
128 | ||
129 | return tsp; | |
130 | } | |
131 | ||
132 | /** | |
133 | * smk_copy_rules - copy a rule set | |
134 | * @nhead - new rules header pointer | |
135 | * @ohead - old rules header pointer | |
136 | * | |
137 | * Returns 0 on success, -ENOMEM on error | |
138 | */ | |
139 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
140 | gfp_t gfp) | |
141 | { | |
142 | struct smack_rule *nrp; | |
143 | struct smack_rule *orp; | |
144 | int rc = 0; | |
145 | ||
146 | INIT_LIST_HEAD(nhead); | |
147 | ||
148 | list_for_each_entry_rcu(orp, ohead, list) { | |
149 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
150 | if (nrp == NULL) { | |
151 | rc = -ENOMEM; | |
152 | break; | |
153 | } | |
154 | *nrp = *orp; | |
155 | list_add_rcu(&nrp->list, nhead); | |
156 | } | |
157 | return rc; | |
158 | } | |
159 | ||
e114e473 CS |
160 | /* |
161 | * LSM hooks. | |
162 | * We he, that is fun! | |
163 | */ | |
164 | ||
165 | /** | |
9e48858f | 166 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 167 | * @ctp: child task pointer |
251a2a95 | 168 | * @mode: ptrace attachment mode |
e114e473 CS |
169 | * |
170 | * Returns 0 if access is OK, an error code otherwise | |
171 | * | |
172 | * Do the capability checks, and require read and write. | |
173 | */ | |
9e48858f | 174 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
175 | { |
176 | int rc; | |
ecfcc53f | 177 | struct smk_audit_info ad; |
2f823ff8 | 178 | struct smack_known *skp; |
e114e473 | 179 | |
9e48858f | 180 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
181 | if (rc != 0) |
182 | return rc; | |
183 | ||
2f823ff8 | 184 | skp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
185 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
186 | smk_ad_setfield_u_tsk(&ad, ctp); | |
187 | ||
b5dfd807 | 188 | rc = smk_curacc(skp->smk_known, mode, &ad); |
5cd9c58f DH |
189 | return rc; |
190 | } | |
191 | ||
192 | /** | |
193 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
194 | * @ptp: parent task pointer | |
195 | * | |
196 | * Returns 0 if access is OK, an error code otherwise | |
197 | * | |
198 | * Do the capability checks, and require read and write. | |
199 | */ | |
200 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
201 | { | |
202 | int rc; | |
ecfcc53f | 203 | struct smk_audit_info ad; |
2f823ff8 | 204 | struct smack_known *skp; |
5cd9c58f DH |
205 | |
206 | rc = cap_ptrace_traceme(ptp); | |
207 | if (rc != 0) | |
208 | return rc; | |
e114e473 | 209 | |
2f823ff8 | 210 | skp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
211 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
212 | smk_ad_setfield_u_tsk(&ad, ptp); | |
213 | ||
2f823ff8 | 214 | rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad); |
e114e473 CS |
215 | return rc; |
216 | } | |
217 | ||
218 | /** | |
219 | * smack_syslog - Smack approval on syslog | |
220 | * @type: message type | |
221 | * | |
e114e473 CS |
222 | * Returns 0 on success, error code otherwise. |
223 | */ | |
12b3052c | 224 | static int smack_syslog(int typefrom_file) |
e114e473 | 225 | { |
12b3052c | 226 | int rc = 0; |
2f823ff8 | 227 | struct smack_known *skp = smk_of_current(); |
e114e473 | 228 | |
1880eff7 | 229 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
230 | return 0; |
231 | ||
24ea1b6e | 232 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
233 | rc = -EACCES; |
234 | ||
235 | return rc; | |
236 | } | |
237 | ||
238 | ||
239 | /* | |
240 | * Superblock Hooks. | |
241 | */ | |
242 | ||
243 | /** | |
244 | * smack_sb_alloc_security - allocate a superblock blob | |
245 | * @sb: the superblock getting the blob | |
246 | * | |
247 | * Returns 0 on success or -ENOMEM on error. | |
248 | */ | |
249 | static int smack_sb_alloc_security(struct super_block *sb) | |
250 | { | |
251 | struct superblock_smack *sbsp; | |
252 | ||
253 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
254 | ||
255 | if (sbsp == NULL) | |
256 | return -ENOMEM; | |
257 | ||
258 | sbsp->smk_root = smack_known_floor.smk_known; | |
259 | sbsp->smk_default = smack_known_floor.smk_known; | |
260 | sbsp->smk_floor = smack_known_floor.smk_known; | |
261 | sbsp->smk_hat = smack_known_hat.smk_known; | |
e830b394 CS |
262 | /* |
263 | * smk_initialized will be zero from kzalloc. | |
264 | */ | |
e114e473 CS |
265 | sb->s_security = sbsp; |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | /** | |
271 | * smack_sb_free_security - free a superblock blob | |
272 | * @sb: the superblock getting the blob | |
273 | * | |
274 | */ | |
275 | static void smack_sb_free_security(struct super_block *sb) | |
276 | { | |
277 | kfree(sb->s_security); | |
278 | sb->s_security = NULL; | |
279 | } | |
280 | ||
281 | /** | |
282 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 283 | * @orig: where to start |
251a2a95 | 284 | * @smackopts: mount options string |
e114e473 CS |
285 | * |
286 | * Returns 0 on success or -ENOMEM on error. | |
287 | * | |
288 | * Copy the Smack specific mount options out of the mount | |
289 | * options list. | |
290 | */ | |
e0007529 | 291 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
292 | { |
293 | char *cp, *commap, *otheropts, *dp; | |
294 | ||
e114e473 CS |
295 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
296 | if (otheropts == NULL) | |
297 | return -ENOMEM; | |
298 | ||
299 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
300 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
301 | dp = smackopts; | |
302 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
303 | dp = smackopts; | |
304 | else if (strstr(cp, SMK_FSHAT) == cp) | |
305 | dp = smackopts; | |
306 | else if (strstr(cp, SMK_FSROOT) == cp) | |
307 | dp = smackopts; | |
e830b394 CS |
308 | else if (strstr(cp, SMK_FSTRANS) == cp) |
309 | dp = smackopts; | |
e114e473 CS |
310 | else |
311 | dp = otheropts; | |
312 | ||
313 | commap = strchr(cp, ','); | |
314 | if (commap != NULL) | |
315 | *commap = '\0'; | |
316 | ||
317 | if (*dp != '\0') | |
318 | strcat(dp, ","); | |
319 | strcat(dp, cp); | |
320 | } | |
321 | ||
322 | strcpy(orig, otheropts); | |
323 | free_page((unsigned long)otheropts); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | /** | |
329 | * smack_sb_kern_mount - Smack specific mount processing | |
330 | * @sb: the file system superblock | |
12204e24 | 331 | * @flags: the mount flags |
e114e473 CS |
332 | * @data: the smack mount options |
333 | * | |
334 | * Returns 0 on success, an error code on failure | |
335 | */ | |
12204e24 | 336 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
337 | { |
338 | struct dentry *root = sb->s_root; | |
339 | struct inode *inode = root->d_inode; | |
340 | struct superblock_smack *sp = sb->s_security; | |
341 | struct inode_smack *isp; | |
24ea1b6e | 342 | struct smack_known *skp; |
e114e473 CS |
343 | char *op; |
344 | char *commap; | |
345 | char *nsp; | |
e830b394 | 346 | int transmute = 0; |
24ea1b6e | 347 | int specified = 0; |
e114e473 | 348 | |
e830b394 | 349 | if (sp->smk_initialized) |
e114e473 | 350 | return 0; |
eb982cb4 | 351 | |
e114e473 | 352 | sp->smk_initialized = 1; |
e114e473 CS |
353 | |
354 | for (op = data; op != NULL; op = commap) { | |
355 | commap = strchr(op, ','); | |
356 | if (commap != NULL) | |
357 | *commap++ = '\0'; | |
358 | ||
359 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
360 | op += strlen(SMK_FSHAT); | |
361 | nsp = smk_import(op, 0); | |
24ea1b6e | 362 | if (nsp != NULL) { |
e114e473 | 363 | sp->smk_hat = nsp; |
24ea1b6e CS |
364 | specified = 1; |
365 | } | |
e114e473 CS |
366 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
367 | op += strlen(SMK_FSFLOOR); | |
368 | nsp = smk_import(op, 0); | |
24ea1b6e | 369 | if (nsp != NULL) { |
e114e473 | 370 | sp->smk_floor = nsp; |
24ea1b6e CS |
371 | specified = 1; |
372 | } | |
e114e473 CS |
373 | } else if (strncmp(op, SMK_FSDEFAULT, |
374 | strlen(SMK_FSDEFAULT)) == 0) { | |
375 | op += strlen(SMK_FSDEFAULT); | |
376 | nsp = smk_import(op, 0); | |
24ea1b6e | 377 | if (nsp != NULL) { |
e114e473 | 378 | sp->smk_default = nsp; |
24ea1b6e CS |
379 | specified = 1; |
380 | } | |
e114e473 CS |
381 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
382 | op += strlen(SMK_FSROOT); | |
383 | nsp = smk_import(op, 0); | |
24ea1b6e | 384 | if (nsp != NULL) { |
e114e473 | 385 | sp->smk_root = nsp; |
24ea1b6e CS |
386 | specified = 1; |
387 | } | |
e830b394 CS |
388 | } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { |
389 | op += strlen(SMK_FSTRANS); | |
390 | nsp = smk_import(op, 0); | |
391 | if (nsp != NULL) { | |
392 | sp->smk_root = nsp; | |
393 | transmute = 1; | |
24ea1b6e | 394 | specified = 1; |
e830b394 | 395 | } |
e114e473 CS |
396 | } |
397 | } | |
398 | ||
24ea1b6e CS |
399 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
400 | /* | |
401 | * Unprivileged mounts don't get to specify Smack values. | |
402 | */ | |
403 | if (specified) | |
404 | return -EPERM; | |
405 | /* | |
406 | * Unprivileged mounts get root and default from the caller. | |
407 | */ | |
408 | skp = smk_of_current(); | |
409 | sp->smk_root = skp->smk_known; | |
410 | sp->smk_default = skp->smk_known; | |
411 | } | |
e114e473 CS |
412 | /* |
413 | * Initialize the root inode. | |
414 | */ | |
415 | isp = inode->i_security; | |
e830b394 | 416 | if (inode->i_security == NULL) { |
e114e473 | 417 | inode->i_security = new_inode_smack(sp->smk_root); |
e830b394 CS |
418 | isp = inode->i_security; |
419 | } else | |
e114e473 CS |
420 | isp->smk_inode = sp->smk_root; |
421 | ||
e830b394 CS |
422 | if (transmute) |
423 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
424 | ||
e114e473 CS |
425 | return 0; |
426 | } | |
427 | ||
428 | /** | |
429 | * smack_sb_statfs - Smack check on statfs | |
430 | * @dentry: identifies the file system in question | |
431 | * | |
432 | * Returns 0 if current can read the floor of the filesystem, | |
433 | * and error code otherwise | |
434 | */ | |
435 | static int smack_sb_statfs(struct dentry *dentry) | |
436 | { | |
437 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
438 | int rc; |
439 | struct smk_audit_info ad; | |
440 | ||
a269434d | 441 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 442 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 443 | |
ecfcc53f EB |
444 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
445 | return rc; | |
e114e473 CS |
446 | } |
447 | ||
676dac4b CS |
448 | /* |
449 | * BPRM hooks | |
450 | */ | |
451 | ||
ce8a4321 CS |
452 | /** |
453 | * smack_bprm_set_creds - set creds for exec | |
454 | * @bprm: the exec information | |
455 | * | |
456 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
457 | */ | |
676dac4b CS |
458 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
459 | { | |
496ad9aa | 460 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 461 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 462 | struct inode_smack *isp; |
676dac4b CS |
463 | int rc; |
464 | ||
465 | rc = cap_bprm_set_creds(bprm); | |
466 | if (rc != 0) | |
467 | return rc; | |
468 | ||
469 | if (bprm->cred_prepared) | |
470 | return 0; | |
471 | ||
84088ba2 JS |
472 | isp = inode->i_security; |
473 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
474 | return 0; |
475 | ||
84088ba2 JS |
476 | if (bprm->unsafe) |
477 | return -EPERM; | |
676dac4b | 478 | |
84088ba2 JS |
479 | bsp->smk_task = isp->smk_task; |
480 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 481 | |
84088ba2 JS |
482 | return 0; |
483 | } | |
676dac4b | 484 | |
84088ba2 JS |
485 | /** |
486 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
487 | * from bprm. | |
488 | * | |
489 | * @bprm: binprm for exec | |
490 | */ | |
491 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
492 | { | |
493 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 494 | |
84088ba2 JS |
495 | if (bsp->smk_task != bsp->smk_forked) |
496 | current->pdeath_signal = 0; | |
497 | } | |
498 | ||
499 | /** | |
500 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
501 | * @bprm: binprm for exec | |
502 | * | |
503 | * Returns 0 on success. | |
504 | */ | |
505 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
506 | { | |
507 | struct task_smack *tsp = current_security(); | |
508 | int ret = cap_bprm_secureexec(bprm); | |
509 | ||
510 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
511 | ret = 1; | |
512 | ||
513 | return ret; | |
676dac4b CS |
514 | } |
515 | ||
e114e473 CS |
516 | /* |
517 | * Inode hooks | |
518 | */ | |
519 | ||
520 | /** | |
521 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 522 | * @inode: the inode in need of a blob |
e114e473 CS |
523 | * |
524 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
525 | */ | |
526 | static int smack_inode_alloc_security(struct inode *inode) | |
527 | { | |
2f823ff8 CS |
528 | struct smack_known *skp = smk_of_current(); |
529 | ||
530 | inode->i_security = new_inode_smack(skp->smk_known); | |
e114e473 CS |
531 | if (inode->i_security == NULL) |
532 | return -ENOMEM; | |
533 | return 0; | |
534 | } | |
535 | ||
536 | /** | |
537 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 538 | * @inode: the inode with a blob |
e114e473 CS |
539 | * |
540 | * Clears the blob pointer in inode | |
541 | */ | |
542 | static void smack_inode_free_security(struct inode *inode) | |
543 | { | |
544 | kfree(inode->i_security); | |
545 | inode->i_security = NULL; | |
546 | } | |
547 | ||
548 | /** | |
549 | * smack_inode_init_security - copy out the smack from an inode | |
550 | * @inode: the inode | |
551 | * @dir: unused | |
2a7dba39 | 552 | * @qstr: unused |
e114e473 CS |
553 | * @name: where to put the attribute name |
554 | * @value: where to put the attribute value | |
555 | * @len: where to put the length of the attribute | |
556 | * | |
557 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
558 | */ | |
559 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 560 | const struct qstr *qstr, const char **name, |
2a7dba39 | 561 | void **value, size_t *len) |
e114e473 | 562 | { |
2267b13a | 563 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 564 | struct smack_known *skp = smk_of_current(); |
e114e473 | 565 | char *isp = smk_of_inode(inode); |
5c6d1125 | 566 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 567 | int may; |
e114e473 | 568 | |
9548906b TH |
569 | if (name) |
570 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 CS |
571 | |
572 | if (value) { | |
7898e1f8 | 573 | rcu_read_lock(); |
2f823ff8 | 574 | may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules); |
7898e1f8 | 575 | rcu_read_unlock(); |
5c6d1125 JS |
576 | |
577 | /* | |
578 | * If the access rule allows transmutation and | |
579 | * the directory requests transmutation then | |
580 | * by all means transmute. | |
2267b13a | 581 | * Mark the inode as changed. |
5c6d1125 | 582 | */ |
7898e1f8 | 583 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 584 | smk_inode_transmutable(dir)) { |
5c6d1125 | 585 | isp = dsp; |
2267b13a CS |
586 | issp->smk_flags |= SMK_INODE_CHANGED; |
587 | } | |
5c6d1125 | 588 | |
ceffec55 | 589 | *value = kstrdup(isp, GFP_NOFS); |
e114e473 CS |
590 | if (*value == NULL) |
591 | return -ENOMEM; | |
592 | } | |
593 | ||
594 | if (len) | |
595 | *len = strlen(isp) + 1; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | /** | |
601 | * smack_inode_link - Smack check on link | |
602 | * @old_dentry: the existing object | |
603 | * @dir: unused | |
604 | * @new_dentry: the new object | |
605 | * | |
606 | * Returns 0 if access is permitted, an error code otherwise | |
607 | */ | |
608 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
609 | struct dentry *new_dentry) | |
610 | { | |
e114e473 | 611 | char *isp; |
ecfcc53f EB |
612 | struct smk_audit_info ad; |
613 | int rc; | |
614 | ||
a269434d | 615 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 616 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
617 | |
618 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 619 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
620 | |
621 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
622 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
623 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
624 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
625 | } |
626 | ||
627 | return rc; | |
628 | } | |
629 | ||
630 | /** | |
631 | * smack_inode_unlink - Smack check on inode deletion | |
632 | * @dir: containing directory object | |
633 | * @dentry: file to unlink | |
634 | * | |
635 | * Returns 0 if current can write the containing directory | |
636 | * and the object, error code otherwise | |
637 | */ | |
638 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
639 | { | |
640 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 641 | struct smk_audit_info ad; |
e114e473 CS |
642 | int rc; |
643 | ||
a269434d | 644 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
645 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
646 | ||
e114e473 CS |
647 | /* |
648 | * You need write access to the thing you're unlinking | |
649 | */ | |
ecfcc53f EB |
650 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
651 | if (rc == 0) { | |
e114e473 CS |
652 | /* |
653 | * You also need write access to the containing directory | |
654 | */ | |
cdb56b60 | 655 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
656 | smk_ad_setfield_u_fs_inode(&ad, dir); |
657 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
658 | } | |
e114e473 CS |
659 | return rc; |
660 | } | |
661 | ||
662 | /** | |
663 | * smack_inode_rmdir - Smack check on directory deletion | |
664 | * @dir: containing directory object | |
665 | * @dentry: directory to unlink | |
666 | * | |
667 | * Returns 0 if current can write the containing directory | |
668 | * and the directory, error code otherwise | |
669 | */ | |
670 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
671 | { | |
ecfcc53f | 672 | struct smk_audit_info ad; |
e114e473 CS |
673 | int rc; |
674 | ||
a269434d | 675 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
676 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
677 | ||
e114e473 CS |
678 | /* |
679 | * You need write access to the thing you're removing | |
680 | */ | |
ecfcc53f EB |
681 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
682 | if (rc == 0) { | |
e114e473 CS |
683 | /* |
684 | * You also need write access to the containing directory | |
685 | */ | |
cdb56b60 | 686 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
687 | smk_ad_setfield_u_fs_inode(&ad, dir); |
688 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
689 | } | |
e114e473 CS |
690 | |
691 | return rc; | |
692 | } | |
693 | ||
694 | /** | |
695 | * smack_inode_rename - Smack check on rename | |
696 | * @old_inode: the old directory | |
697 | * @old_dentry: unused | |
698 | * @new_inode: the new directory | |
699 | * @new_dentry: unused | |
700 | * | |
701 | * Read and write access is required on both the old and | |
702 | * new directories. | |
703 | * | |
704 | * Returns 0 if access is permitted, an error code otherwise | |
705 | */ | |
706 | static int smack_inode_rename(struct inode *old_inode, | |
707 | struct dentry *old_dentry, | |
708 | struct inode *new_inode, | |
709 | struct dentry *new_dentry) | |
710 | { | |
711 | int rc; | |
712 | char *isp; | |
ecfcc53f EB |
713 | struct smk_audit_info ad; |
714 | ||
a269434d | 715 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 716 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
717 | |
718 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 719 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
720 | |
721 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
722 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
723 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
724 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 725 | } |
e114e473 CS |
726 | return rc; |
727 | } | |
728 | ||
729 | /** | |
730 | * smack_inode_permission - Smack version of permission() | |
731 | * @inode: the inode in question | |
732 | * @mask: the access requested | |
e114e473 CS |
733 | * |
734 | * This is the important Smack hook. | |
735 | * | |
736 | * Returns 0 if access is permitted, -EACCES otherwise | |
737 | */ | |
e74f71eb | 738 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 739 | { |
ecfcc53f | 740 | struct smk_audit_info ad; |
e74f71eb | 741 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
742 | |
743 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
744 | /* |
745 | * No permission to check. Existence test. Yup, it's there. | |
746 | */ | |
747 | if (mask == 0) | |
748 | return 0; | |
8c9e80ed AK |
749 | |
750 | /* May be droppable after audit */ | |
e74f71eb | 751 | if (no_block) |
8c9e80ed | 752 | return -ECHILD; |
f48b7399 | 753 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
754 | smk_ad_setfield_u_fs_inode(&ad, inode); |
755 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
756 | } |
757 | ||
758 | /** | |
759 | * smack_inode_setattr - Smack check for setting attributes | |
760 | * @dentry: the object | |
761 | * @iattr: for the force flag | |
762 | * | |
763 | * Returns 0 if access is permitted, an error code otherwise | |
764 | */ | |
765 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
766 | { | |
ecfcc53f | 767 | struct smk_audit_info ad; |
e114e473 CS |
768 | /* |
769 | * Need to allow for clearing the setuid bit. | |
770 | */ | |
771 | if (iattr->ia_valid & ATTR_FORCE) | |
772 | return 0; | |
a269434d | 773 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 774 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 775 | |
ecfcc53f | 776 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
777 | } |
778 | ||
779 | /** | |
780 | * smack_inode_getattr - Smack check for getting attributes | |
781 | * @mnt: unused | |
782 | * @dentry: the object | |
783 | * | |
784 | * Returns 0 if access is permitted, an error code otherwise | |
785 | */ | |
786 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
787 | { | |
ecfcc53f | 788 | struct smk_audit_info ad; |
a269434d | 789 | struct path path; |
ecfcc53f | 790 | |
a269434d EP |
791 | path.dentry = dentry; |
792 | path.mnt = mnt; | |
ecfcc53f | 793 | |
f48b7399 | 794 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 795 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 796 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
797 | } |
798 | ||
799 | /** | |
800 | * smack_inode_setxattr - Smack check for setting xattrs | |
801 | * @dentry: the object | |
802 | * @name: name of the attribute | |
803 | * @value: unused | |
804 | * @size: unused | |
805 | * @flags: unused | |
806 | * | |
807 | * This protects the Smack attribute explicitly. | |
808 | * | |
809 | * Returns 0 if access is permitted, an error code otherwise | |
810 | */ | |
8f0cfa52 DH |
811 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
812 | const void *value, size_t size, int flags) | |
e114e473 | 813 | { |
ecfcc53f | 814 | struct smk_audit_info ad; |
19760ad0 CS |
815 | struct smack_known *skp; |
816 | int check_priv = 0; | |
817 | int check_import = 0; | |
818 | int check_star = 0; | |
bcdca225 | 819 | int rc = 0; |
e114e473 | 820 | |
19760ad0 CS |
821 | /* |
822 | * Check label validity here so import won't fail in post_setxattr | |
823 | */ | |
bcdca225 CS |
824 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
825 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
826 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
827 | check_priv = 1; | |
828 | check_import = 1; | |
829 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
830 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
831 | check_priv = 1; | |
832 | check_import = 1; | |
833 | check_star = 1; | |
5c6d1125 | 834 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 835 | check_priv = 1; |
5c6d1125 JS |
836 | if (size != TRANS_TRUE_SIZE || |
837 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
838 | rc = -EINVAL; | |
bcdca225 CS |
839 | } else |
840 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
841 | ||
19760ad0 CS |
842 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
843 | rc = -EPERM; | |
844 | ||
845 | if (rc == 0 && check_import) { | |
846 | skp = smk_import_entry(value, size); | |
847 | if (skp == NULL || (check_star && | |
848 | (skp == &smack_known_star || skp == &smack_known_web))) | |
849 | rc = -EINVAL; | |
850 | } | |
851 | ||
a269434d | 852 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
853 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
854 | ||
bcdca225 | 855 | if (rc == 0) |
ecfcc53f | 856 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
857 | |
858 | return rc; | |
e114e473 CS |
859 | } |
860 | ||
861 | /** | |
862 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
863 | * @dentry: object | |
864 | * @name: attribute name | |
865 | * @value: attribute value | |
866 | * @size: attribute size | |
867 | * @flags: unused | |
868 | * | |
869 | * Set the pointer in the inode blob to the entry found | |
870 | * in the master label list. | |
871 | */ | |
8f0cfa52 DH |
872 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
873 | const void *value, size_t size, int flags) | |
e114e473 | 874 | { |
2f823ff8 | 875 | struct smack_known *skp; |
5c6d1125 | 876 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b | 877 | |
2f823ff8 CS |
878 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
879 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
880 | return; | |
881 | } | |
882 | ||
883 | skp = smk_import_entry(value, size); | |
676dac4b | 884 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
2f823ff8 CS |
885 | if (skp != NULL) |
886 | isp->smk_inode = skp->smk_known; | |
676dac4b CS |
887 | else |
888 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 | 889 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
2f823ff8 CS |
890 | if (skp != NULL) |
891 | isp->smk_task = skp; | |
676dac4b | 892 | else |
2f823ff8 | 893 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 894 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
2f823ff8 CS |
895 | if (skp != NULL) |
896 | isp->smk_mmap = skp; | |
7898e1f8 | 897 | else |
2f823ff8 CS |
898 | isp->smk_mmap = &smack_known_invalid; |
899 | } | |
e114e473 CS |
900 | |
901 | return; | |
902 | } | |
903 | ||
ce8a4321 | 904 | /** |
e114e473 CS |
905 | * smack_inode_getxattr - Smack check on getxattr |
906 | * @dentry: the object | |
907 | * @name: unused | |
908 | * | |
909 | * Returns 0 if access is permitted, an error code otherwise | |
910 | */ | |
8f0cfa52 | 911 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 912 | { |
ecfcc53f EB |
913 | struct smk_audit_info ad; |
914 | ||
a269434d | 915 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
916 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
917 | ||
918 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
919 | } |
920 | ||
ce8a4321 | 921 | /** |
e114e473 CS |
922 | * smack_inode_removexattr - Smack check on removexattr |
923 | * @dentry: the object | |
924 | * @name: name of the attribute | |
925 | * | |
926 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
927 | * | |
928 | * Returns 0 if access is permitted, an error code otherwise | |
929 | */ | |
8f0cfa52 | 930 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 931 | { |
676dac4b | 932 | struct inode_smack *isp; |
ecfcc53f | 933 | struct smk_audit_info ad; |
bcdca225 | 934 | int rc = 0; |
e114e473 | 935 | |
bcdca225 CS |
936 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
937 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 938 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 939 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
940 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
941 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
1880eff7 | 942 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
943 | rc = -EPERM; |
944 | } else | |
945 | rc = cap_inode_removexattr(dentry, name); | |
946 | ||
a269434d | 947 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 948 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 949 | if (rc == 0) |
ecfcc53f | 950 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 951 | |
676dac4b CS |
952 | if (rc == 0) { |
953 | isp = dentry->d_inode->i_security; | |
954 | isp->smk_task = NULL; | |
7898e1f8 | 955 | isp->smk_mmap = NULL; |
676dac4b CS |
956 | } |
957 | ||
bcdca225 | 958 | return rc; |
e114e473 CS |
959 | } |
960 | ||
961 | /** | |
962 | * smack_inode_getsecurity - get smack xattrs | |
963 | * @inode: the object | |
964 | * @name: attribute name | |
965 | * @buffer: where to put the result | |
251a2a95 | 966 | * @alloc: unused |
e114e473 CS |
967 | * |
968 | * Returns the size of the attribute or an error code | |
969 | */ | |
970 | static int smack_inode_getsecurity(const struct inode *inode, | |
971 | const char *name, void **buffer, | |
972 | bool alloc) | |
973 | { | |
974 | struct socket_smack *ssp; | |
975 | struct socket *sock; | |
976 | struct super_block *sbp; | |
977 | struct inode *ip = (struct inode *)inode; | |
978 | char *isp; | |
979 | int ilen; | |
980 | int rc = 0; | |
981 | ||
982 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
983 | isp = smk_of_inode(inode); | |
984 | ilen = strlen(isp) + 1; | |
985 | *buffer = isp; | |
986 | return ilen; | |
987 | } | |
988 | ||
989 | /* | |
990 | * The rest of the Smack xattrs are only on sockets. | |
991 | */ | |
992 | sbp = ip->i_sb; | |
993 | if (sbp->s_magic != SOCKFS_MAGIC) | |
994 | return -EOPNOTSUPP; | |
995 | ||
996 | sock = SOCKET_I(ip); | |
2e1d146a | 997 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
998 | return -EOPNOTSUPP; |
999 | ||
1000 | ssp = sock->sk->sk_security; | |
1001 | ||
1002 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1003 | isp = ssp->smk_in; | |
1004 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
2f823ff8 | 1005 | isp = ssp->smk_out->smk_known; |
e114e473 CS |
1006 | else |
1007 | return -EOPNOTSUPP; | |
1008 | ||
1009 | ilen = strlen(isp) + 1; | |
1010 | if (rc == 0) { | |
1011 | *buffer = isp; | |
1012 | rc = ilen; | |
1013 | } | |
1014 | ||
1015 | return rc; | |
1016 | } | |
1017 | ||
1018 | ||
1019 | /** | |
1020 | * smack_inode_listsecurity - list the Smack attributes | |
1021 | * @inode: the object | |
1022 | * @buffer: where they go | |
1023 | * @buffer_size: size of buffer | |
1024 | * | |
1025 | * Returns 0 on success, -EINVAL otherwise | |
1026 | */ | |
1027 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1028 | size_t buffer_size) | |
1029 | { | |
1030 | int len = strlen(XATTR_NAME_SMACK); | |
1031 | ||
1032 | if (buffer != NULL && len <= buffer_size) { | |
1033 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1034 | return len; | |
1035 | } | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | ||
d20bdda6 AD |
1039 | /** |
1040 | * smack_inode_getsecid - Extract inode's security id | |
1041 | * @inode: inode to extract the info from | |
1042 | * @secid: where result will be saved | |
1043 | */ | |
1044 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1045 | { | |
1046 | struct inode_smack *isp = inode->i_security; | |
1047 | ||
1048 | *secid = smack_to_secid(isp->smk_inode); | |
1049 | } | |
1050 | ||
e114e473 CS |
1051 | /* |
1052 | * File Hooks | |
1053 | */ | |
1054 | ||
1055 | /** | |
1056 | * smack_file_permission - Smack check on file operations | |
1057 | * @file: unused | |
1058 | * @mask: unused | |
1059 | * | |
1060 | * Returns 0 | |
1061 | * | |
1062 | * Should access checks be done on each read or write? | |
1063 | * UNICOS and SELinux say yes. | |
1064 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1065 | * | |
1066 | * I'll say no for now. Smack does not do the frequent | |
1067 | * label changing that SELinux does. | |
1068 | */ | |
1069 | static int smack_file_permission(struct file *file, int mask) | |
1070 | { | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * smack_file_alloc_security - assign a file security blob | |
1076 | * @file: the object | |
1077 | * | |
1078 | * The security blob for a file is a pointer to the master | |
1079 | * label list, so no allocation is done. | |
1080 | * | |
1081 | * Returns 0 | |
1082 | */ | |
1083 | static int smack_file_alloc_security(struct file *file) | |
1084 | { | |
2f823ff8 CS |
1085 | struct smack_known *skp = smk_of_current(); |
1086 | ||
1087 | file->f_security = skp->smk_known; | |
e114e473 CS |
1088 | return 0; |
1089 | } | |
1090 | ||
1091 | /** | |
1092 | * smack_file_free_security - clear a file security blob | |
1093 | * @file: the object | |
1094 | * | |
1095 | * The security blob for a file is a pointer to the master | |
1096 | * label list, so no memory is freed. | |
1097 | */ | |
1098 | static void smack_file_free_security(struct file *file) | |
1099 | { | |
1100 | file->f_security = NULL; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * smack_file_ioctl - Smack check on ioctls | |
1105 | * @file: the object | |
1106 | * @cmd: what to do | |
1107 | * @arg: unused | |
1108 | * | |
1109 | * Relies heavily on the correct use of the ioctl command conventions. | |
1110 | * | |
1111 | * Returns 0 if allowed, error code otherwise | |
1112 | */ | |
1113 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1114 | unsigned long arg) | |
1115 | { | |
1116 | int rc = 0; | |
ecfcc53f EB |
1117 | struct smk_audit_info ad; |
1118 | ||
f48b7399 | 1119 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1120 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1121 | |
1122 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1123 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1124 | |
1125 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1126 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1127 | |
1128 | return rc; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * smack_file_lock - Smack check on file locking | |
1133 | * @file: the object | |
251a2a95 | 1134 | * @cmd: unused |
e114e473 | 1135 | * |
c0ab6e56 | 1136 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1137 | */ |
1138 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1139 | { | |
ecfcc53f EB |
1140 | struct smk_audit_info ad; |
1141 | ||
92f42509 EP |
1142 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1143 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c0ab6e56 | 1144 | return smk_curacc(file->f_security, MAY_LOCK, &ad); |
e114e473 CS |
1145 | } |
1146 | ||
1147 | /** | |
1148 | * smack_file_fcntl - Smack check on fcntl | |
1149 | * @file: the object | |
1150 | * @cmd: what action to check | |
1151 | * @arg: unused | |
1152 | * | |
531f1d45 CS |
1153 | * Generally these operations are harmless. |
1154 | * File locking operations present an obvious mechanism | |
1155 | * for passing information, so they require write access. | |
1156 | * | |
e114e473 CS |
1157 | * Returns 0 if current has access, error code otherwise |
1158 | */ | |
1159 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1160 | unsigned long arg) | |
1161 | { | |
ecfcc53f | 1162 | struct smk_audit_info ad; |
531f1d45 | 1163 | int rc = 0; |
e114e473 | 1164 | |
ecfcc53f | 1165 | |
e114e473 | 1166 | switch (cmd) { |
e114e473 | 1167 | case F_GETLK: |
c0ab6e56 | 1168 | break; |
e114e473 CS |
1169 | case F_SETLK: |
1170 | case F_SETLKW: | |
c0ab6e56 CS |
1171 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1172 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1173 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); | |
1174 | break; | |
e114e473 CS |
1175 | case F_SETOWN: |
1176 | case F_SETSIG: | |
531f1d45 CS |
1177 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1178 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1179 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1180 | break; |
1181 | default: | |
531f1d45 | 1182 | break; |
e114e473 CS |
1183 | } |
1184 | ||
1185 | return rc; | |
1186 | } | |
1187 | ||
7898e1f8 | 1188 | /** |
e5467859 | 1189 | * smack_mmap_file : |
7898e1f8 CS |
1190 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1191 | * if mapping anonymous memory. | |
1192 | * @file contains the file structure for file to map (may be NULL). | |
1193 | * @reqprot contains the protection requested by the application. | |
1194 | * @prot contains the protection that will be applied by the kernel. | |
1195 | * @flags contains the operational flags. | |
1196 | * Return 0 if permission is granted. | |
1197 | */ | |
e5467859 | 1198 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1199 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1200 | unsigned long flags) |
7898e1f8 | 1201 | { |
272cd7a8 | 1202 | struct smack_known *skp; |
2f823ff8 | 1203 | struct smack_known *mkp; |
7898e1f8 CS |
1204 | struct smack_rule *srp; |
1205 | struct task_smack *tsp; | |
0e0a070d | 1206 | char *osmack; |
7898e1f8 | 1207 | struct inode_smack *isp; |
0e0a070d CS |
1208 | int may; |
1209 | int mmay; | |
1210 | int tmay; | |
7898e1f8 CS |
1211 | int rc; |
1212 | ||
496ad9aa | 1213 | if (file == NULL) |
7898e1f8 CS |
1214 | return 0; |
1215 | ||
496ad9aa | 1216 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1217 | if (isp->smk_mmap == NULL) |
1218 | return 0; | |
2f823ff8 | 1219 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1220 | |
1221 | tsp = current_security(); | |
2f823ff8 | 1222 | skp = smk_of_current(); |
7898e1f8 CS |
1223 | rc = 0; |
1224 | ||
1225 | rcu_read_lock(); | |
1226 | /* | |
1227 | * For each Smack rule associated with the subject | |
1228 | * label verify that the SMACK64MMAP also has access | |
1229 | * to that rule's object label. | |
7898e1f8 | 1230 | */ |
272cd7a8 | 1231 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1232 | osmack = srp->smk_object; |
7898e1f8 CS |
1233 | /* |
1234 | * Matching labels always allows access. | |
1235 | */ | |
2f823ff8 | 1236 | if (mkp->smk_known == osmack) |
7898e1f8 | 1237 | continue; |
0e0a070d CS |
1238 | /* |
1239 | * If there is a matching local rule take | |
1240 | * that into account as well. | |
1241 | */ | |
2f823ff8 | 1242 | may = smk_access_entry(srp->smk_subject->smk_known, osmack, |
0e0a070d CS |
1243 | &tsp->smk_rules); |
1244 | if (may == -ENOENT) | |
1245 | may = srp->smk_access; | |
1246 | else | |
1247 | may &= srp->smk_access; | |
1248 | /* | |
1249 | * If may is zero the SMACK64MMAP subject can't | |
1250 | * possibly have less access. | |
1251 | */ | |
1252 | if (may == 0) | |
1253 | continue; | |
1254 | ||
1255 | /* | |
1256 | * Fetch the global list entry. | |
1257 | * If there isn't one a SMACK64MMAP subject | |
1258 | * can't have as much access as current. | |
1259 | */ | |
2f823ff8 CS |
1260 | mmay = smk_access_entry(mkp->smk_known, osmack, |
1261 | &mkp->smk_rules); | |
0e0a070d CS |
1262 | if (mmay == -ENOENT) { |
1263 | rc = -EACCES; | |
1264 | break; | |
1265 | } | |
1266 | /* | |
1267 | * If there is a local entry it modifies the | |
1268 | * potential access, too. | |
1269 | */ | |
2f823ff8 CS |
1270 | tmay = smk_access_entry(mkp->smk_known, osmack, |
1271 | &tsp->smk_rules); | |
0e0a070d CS |
1272 | if (tmay != -ENOENT) |
1273 | mmay &= tmay; | |
7898e1f8 | 1274 | |
0e0a070d CS |
1275 | /* |
1276 | * If there is any access available to current that is | |
1277 | * not available to a SMACK64MMAP subject | |
1278 | * deny access. | |
1279 | */ | |
75a25637 | 1280 | if ((may | mmay) != mmay) { |
0e0a070d | 1281 | rc = -EACCES; |
7898e1f8 | 1282 | break; |
0e0a070d | 1283 | } |
7898e1f8 CS |
1284 | } |
1285 | ||
1286 | rcu_read_unlock(); | |
1287 | ||
1288 | return rc; | |
1289 | } | |
1290 | ||
e114e473 CS |
1291 | /** |
1292 | * smack_file_set_fowner - set the file security blob value | |
1293 | * @file: object in question | |
1294 | * | |
1295 | * Returns 0 | |
1296 | * Further research may be required on this one. | |
1297 | */ | |
1298 | static int smack_file_set_fowner(struct file *file) | |
1299 | { | |
2f823ff8 CS |
1300 | struct smack_known *skp = smk_of_current(); |
1301 | ||
1302 | file->f_security = skp->smk_known; | |
e114e473 CS |
1303 | return 0; |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * smack_file_send_sigiotask - Smack on sigio | |
1308 | * @tsk: The target task | |
1309 | * @fown: the object the signal come from | |
1310 | * @signum: unused | |
1311 | * | |
1312 | * Allow a privileged task to get signals even if it shouldn't | |
1313 | * | |
1314 | * Returns 0 if a subject with the object's smack could | |
1315 | * write to the task, an error code otherwise. | |
1316 | */ | |
1317 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1318 | struct fown_struct *fown, int signum) | |
1319 | { | |
2f823ff8 CS |
1320 | struct smack_known *skp; |
1321 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1322 | struct file *file; |
1323 | int rc; | |
ecfcc53f | 1324 | struct smk_audit_info ad; |
e114e473 CS |
1325 | |
1326 | /* | |
1327 | * struct fown_struct is never outside the context of a struct file | |
1328 | */ | |
1329 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1330 | |
ecfcc53f | 1331 | /* we don't log here as rc can be overriden */ |
2f823ff8 CS |
1332 | skp = smk_find_entry(file->f_security); |
1333 | rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL); | |
5cd9c58f | 1334 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1335 | rc = 0; |
1336 | ||
1337 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1338 | smk_ad_setfield_u_tsk(&ad, tsk); | |
2f823ff8 | 1339 | smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1340 | return rc; |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * smack_file_receive - Smack file receive check | |
1345 | * @file: the object | |
1346 | * | |
1347 | * Returns 0 if current has access, error code otherwise | |
1348 | */ | |
1349 | static int smack_file_receive(struct file *file) | |
1350 | { | |
1351 | int may = 0; | |
ecfcc53f | 1352 | struct smk_audit_info ad; |
e114e473 | 1353 | |
4482a44f | 1354 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1355 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1356 | /* |
1357 | * This code relies on bitmasks. | |
1358 | */ | |
1359 | if (file->f_mode & FMODE_READ) | |
1360 | may = MAY_READ; | |
1361 | if (file->f_mode & FMODE_WRITE) | |
1362 | may |= MAY_WRITE; | |
1363 | ||
ecfcc53f | 1364 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1365 | } |
1366 | ||
531f1d45 | 1367 | /** |
83d49856 | 1368 | * smack_file_open - Smack dentry open processing |
531f1d45 CS |
1369 | * @file: the object |
1370 | * @cred: unused | |
1371 | * | |
1372 | * Set the security blob in the file structure. | |
1373 | * | |
1374 | * Returns 0 | |
1375 | */ | |
83d49856 | 1376 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1377 | { |
496ad9aa | 1378 | struct inode_smack *isp = file_inode(file)->i_security; |
531f1d45 CS |
1379 | |
1380 | file->f_security = isp->smk_inode; | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
e114e473 CS |
1385 | /* |
1386 | * Task hooks | |
1387 | */ | |
1388 | ||
ee18d64c DH |
1389 | /** |
1390 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1391 | * @new: the new credentials | |
1392 | * @gfp: the atomicity of any memory allocations | |
1393 | * | |
1394 | * Prepare a blank set of credentials for modification. This must allocate all | |
1395 | * the memory the LSM module might require such that cred_transfer() can | |
1396 | * complete without error. | |
1397 | */ | |
1398 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1399 | { | |
7898e1f8 CS |
1400 | struct task_smack *tsp; |
1401 | ||
1402 | tsp = new_task_smack(NULL, NULL, gfp); | |
1403 | if (tsp == NULL) | |
676dac4b | 1404 | return -ENOMEM; |
7898e1f8 CS |
1405 | |
1406 | cred->security = tsp; | |
1407 | ||
ee18d64c DH |
1408 | return 0; |
1409 | } | |
1410 | ||
1411 | ||
e114e473 | 1412 | /** |
f1752eec DH |
1413 | * smack_cred_free - "free" task-level security credentials |
1414 | * @cred: the credentials in question | |
e114e473 | 1415 | * |
e114e473 | 1416 | */ |
f1752eec | 1417 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1418 | { |
7898e1f8 CS |
1419 | struct task_smack *tsp = cred->security; |
1420 | struct smack_rule *rp; | |
1421 | struct list_head *l; | |
1422 | struct list_head *n; | |
1423 | ||
1424 | if (tsp == NULL) | |
1425 | return; | |
1426 | cred->security = NULL; | |
1427 | ||
1428 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1429 | rp = list_entry(l, struct smack_rule, list); | |
1430 | list_del(&rp->list); | |
1431 | kfree(rp); | |
1432 | } | |
1433 | kfree(tsp); | |
e114e473 CS |
1434 | } |
1435 | ||
d84f4f99 DH |
1436 | /** |
1437 | * smack_cred_prepare - prepare new set of credentials for modification | |
1438 | * @new: the new credentials | |
1439 | * @old: the original credentials | |
1440 | * @gfp: the atomicity of any memory allocations | |
1441 | * | |
1442 | * Prepare a new set of credentials for modification. | |
1443 | */ | |
1444 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1445 | gfp_t gfp) | |
1446 | { | |
676dac4b CS |
1447 | struct task_smack *old_tsp = old->security; |
1448 | struct task_smack *new_tsp; | |
7898e1f8 | 1449 | int rc; |
676dac4b | 1450 | |
7898e1f8 | 1451 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1452 | if (new_tsp == NULL) |
1453 | return -ENOMEM; | |
1454 | ||
7898e1f8 CS |
1455 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1456 | if (rc != 0) | |
1457 | return rc; | |
1458 | ||
676dac4b | 1459 | new->security = new_tsp; |
d84f4f99 DH |
1460 | return 0; |
1461 | } | |
1462 | ||
ee18d64c DH |
1463 | /** |
1464 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1465 | * @new: the new credentials | |
1466 | * @old: the original credentials | |
1467 | * | |
1468 | * Fill in a set of blank credentials from another set of credentials. | |
1469 | */ | |
1470 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1471 | { | |
676dac4b CS |
1472 | struct task_smack *old_tsp = old->security; |
1473 | struct task_smack *new_tsp = new->security; | |
1474 | ||
1475 | new_tsp->smk_task = old_tsp->smk_task; | |
1476 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1477 | mutex_init(&new_tsp->smk_rules_lock); |
1478 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1479 | ||
1480 | ||
1481 | /* cbs copy rule list */ | |
ee18d64c DH |
1482 | } |
1483 | ||
3a3b7ce9 DH |
1484 | /** |
1485 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1486 | * @new: points to the set of credentials to be modified. |
1487 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1488 | * |
1489 | * Set the security data for a kernel service. | |
1490 | */ | |
1491 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1492 | { | |
676dac4b | 1493 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1494 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1495 | |
2f823ff8 | 1496 | if (skp == NULL) |
3a3b7ce9 DH |
1497 | return -EINVAL; |
1498 | ||
2f823ff8 | 1499 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1500 | return 0; |
1501 | } | |
1502 | ||
1503 | /** | |
1504 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1505 | * @new: points to the set of credentials to be modified |
1506 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1507 | * |
1508 | * Set the file creation context in a set of credentials to the same | |
1509 | * as the objective context of the specified inode | |
1510 | */ | |
1511 | static int smack_kernel_create_files_as(struct cred *new, | |
1512 | struct inode *inode) | |
1513 | { | |
1514 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1515 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1516 | |
2f823ff8 CS |
1517 | tsp->smk_forked = smk_find_entry(isp->smk_inode); |
1518 | tsp->smk_task = tsp->smk_forked; | |
3a3b7ce9 DH |
1519 | return 0; |
1520 | } | |
1521 | ||
ecfcc53f EB |
1522 | /** |
1523 | * smk_curacc_on_task - helper to log task related access | |
1524 | * @p: the task object | |
531f1d45 CS |
1525 | * @access: the access requested |
1526 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1527 | * |
1528 | * Return 0 if access is permitted | |
1529 | */ | |
531f1d45 CS |
1530 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1531 | const char *caller) | |
ecfcc53f EB |
1532 | { |
1533 | struct smk_audit_info ad; | |
2f823ff8 | 1534 | struct smack_known *skp = smk_of_task(task_security(p)); |
ecfcc53f | 1535 | |
531f1d45 | 1536 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1537 | smk_ad_setfield_u_tsk(&ad, p); |
2f823ff8 | 1538 | return smk_curacc(skp->smk_known, access, &ad); |
ecfcc53f EB |
1539 | } |
1540 | ||
e114e473 CS |
1541 | /** |
1542 | * smack_task_setpgid - Smack check on setting pgid | |
1543 | * @p: the task object | |
1544 | * @pgid: unused | |
1545 | * | |
1546 | * Return 0 if write access is permitted | |
1547 | */ | |
1548 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1549 | { | |
531f1d45 | 1550 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1551 | } |
1552 | ||
1553 | /** | |
1554 | * smack_task_getpgid - Smack access check for getpgid | |
1555 | * @p: the object task | |
1556 | * | |
1557 | * Returns 0 if current can read the object task, error code otherwise | |
1558 | */ | |
1559 | static int smack_task_getpgid(struct task_struct *p) | |
1560 | { | |
531f1d45 | 1561 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1562 | } |
1563 | ||
1564 | /** | |
1565 | * smack_task_getsid - Smack access check for getsid | |
1566 | * @p: the object task | |
1567 | * | |
1568 | * Returns 0 if current can read the object task, error code otherwise | |
1569 | */ | |
1570 | static int smack_task_getsid(struct task_struct *p) | |
1571 | { | |
531f1d45 | 1572 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1573 | } |
1574 | ||
1575 | /** | |
1576 | * smack_task_getsecid - get the secid of the task | |
1577 | * @p: the object task | |
1578 | * @secid: where to put the result | |
1579 | * | |
1580 | * Sets the secid to contain a u32 version of the smack label. | |
1581 | */ | |
1582 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1583 | { | |
2f823ff8 CS |
1584 | struct smack_known *skp = smk_of_task(task_security(p)); |
1585 | ||
1586 | *secid = skp->smk_secid; | |
e114e473 CS |
1587 | } |
1588 | ||
1589 | /** | |
1590 | * smack_task_setnice - Smack check on setting nice | |
1591 | * @p: the task object | |
1592 | * @nice: unused | |
1593 | * | |
1594 | * Return 0 if write access is permitted | |
1595 | */ | |
1596 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1597 | { | |
bcdca225 CS |
1598 | int rc; |
1599 | ||
1600 | rc = cap_task_setnice(p, nice); | |
1601 | if (rc == 0) | |
531f1d45 | 1602 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1603 | return rc; |
e114e473 CS |
1604 | } |
1605 | ||
1606 | /** | |
1607 | * smack_task_setioprio - Smack check on setting ioprio | |
1608 | * @p: the task object | |
1609 | * @ioprio: unused | |
1610 | * | |
1611 | * Return 0 if write access is permitted | |
1612 | */ | |
1613 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1614 | { | |
bcdca225 CS |
1615 | int rc; |
1616 | ||
1617 | rc = cap_task_setioprio(p, ioprio); | |
1618 | if (rc == 0) | |
531f1d45 | 1619 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1620 | return rc; |
e114e473 CS |
1621 | } |
1622 | ||
1623 | /** | |
1624 | * smack_task_getioprio - Smack check on reading ioprio | |
1625 | * @p: the task object | |
1626 | * | |
1627 | * Return 0 if read access is permitted | |
1628 | */ | |
1629 | static int smack_task_getioprio(struct task_struct *p) | |
1630 | { | |
531f1d45 | 1631 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1632 | } |
1633 | ||
1634 | /** | |
1635 | * smack_task_setscheduler - Smack check on setting scheduler | |
1636 | * @p: the task object | |
1637 | * @policy: unused | |
1638 | * @lp: unused | |
1639 | * | |
1640 | * Return 0 if read access is permitted | |
1641 | */ | |
b0ae1981 | 1642 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1643 | { |
bcdca225 CS |
1644 | int rc; |
1645 | ||
b0ae1981 | 1646 | rc = cap_task_setscheduler(p); |
bcdca225 | 1647 | if (rc == 0) |
531f1d45 | 1648 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1649 | return rc; |
e114e473 CS |
1650 | } |
1651 | ||
1652 | /** | |
1653 | * smack_task_getscheduler - Smack check on reading scheduler | |
1654 | * @p: the task object | |
1655 | * | |
1656 | * Return 0 if read access is permitted | |
1657 | */ | |
1658 | static int smack_task_getscheduler(struct task_struct *p) | |
1659 | { | |
531f1d45 | 1660 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1661 | } |
1662 | ||
1663 | /** | |
1664 | * smack_task_movememory - Smack check on moving memory | |
1665 | * @p: the task object | |
1666 | * | |
1667 | * Return 0 if write access is permitted | |
1668 | */ | |
1669 | static int smack_task_movememory(struct task_struct *p) | |
1670 | { | |
531f1d45 | 1671 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1672 | } |
1673 | ||
1674 | /** | |
1675 | * smack_task_kill - Smack check on signal delivery | |
1676 | * @p: the task object | |
1677 | * @info: unused | |
1678 | * @sig: unused | |
1679 | * @secid: identifies the smack to use in lieu of current's | |
1680 | * | |
1681 | * Return 0 if write access is permitted | |
1682 | * | |
1683 | * The secid behavior is an artifact of an SELinux hack | |
1684 | * in the USB code. Someday it may go away. | |
1685 | */ | |
1686 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1687 | int sig, u32 secid) | |
1688 | { | |
ecfcc53f | 1689 | struct smk_audit_info ad; |
2f823ff8 CS |
1690 | struct smack_known *skp; |
1691 | struct smack_known *tkp = smk_of_task(task_security(p)); | |
ecfcc53f EB |
1692 | |
1693 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1694 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1695 | /* |
1696 | * Sending a signal requires that the sender | |
1697 | * can write the receiver. | |
1698 | */ | |
1699 | if (secid == 0) | |
2f823ff8 | 1700 | return smk_curacc(tkp->smk_known, MAY_WRITE, &ad); |
e114e473 CS |
1701 | /* |
1702 | * If the secid isn't 0 we're dealing with some USB IO | |
1703 | * specific behavior. This is not clean. For one thing | |
1704 | * we can't take privilege into account. | |
1705 | */ | |
2f823ff8 CS |
1706 | skp = smack_from_secid(secid); |
1707 | return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad); | |
e114e473 CS |
1708 | } |
1709 | ||
1710 | /** | |
1711 | * smack_task_wait - Smack access check for waiting | |
1712 | * @p: task to wait for | |
1713 | * | |
c00bedb3 | 1714 | * Returns 0 |
e114e473 CS |
1715 | */ |
1716 | static int smack_task_wait(struct task_struct *p) | |
1717 | { | |
e114e473 | 1718 | /* |
c00bedb3 CS |
1719 | * Allow the operation to succeed. |
1720 | * Zombies are bad. | |
1721 | * In userless environments (e.g. phones) programs | |
1722 | * get marked with SMACK64EXEC and even if the parent | |
1723 | * and child shouldn't be talking the parent still | |
1724 | * may expect to know when the child exits. | |
e114e473 | 1725 | */ |
c00bedb3 | 1726 | return 0; |
e114e473 CS |
1727 | } |
1728 | ||
1729 | /** | |
1730 | * smack_task_to_inode - copy task smack into the inode blob | |
1731 | * @p: task to copy from | |
251a2a95 | 1732 | * @inode: inode to copy to |
e114e473 CS |
1733 | * |
1734 | * Sets the smack pointer in the inode security blob | |
1735 | */ | |
1736 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1737 | { | |
1738 | struct inode_smack *isp = inode->i_security; | |
2f823ff8 CS |
1739 | struct smack_known *skp = smk_of_task(task_security(p)); |
1740 | ||
1741 | isp->smk_inode = skp->smk_known; | |
e114e473 CS |
1742 | } |
1743 | ||
1744 | /* | |
1745 | * Socket hooks. | |
1746 | */ | |
1747 | ||
1748 | /** | |
1749 | * smack_sk_alloc_security - Allocate a socket blob | |
1750 | * @sk: the socket | |
1751 | * @family: unused | |
251a2a95 | 1752 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1753 | * |
1754 | * Assign Smack pointers to current | |
1755 | * | |
1756 | * Returns 0 on success, -ENOMEM is there's no memory | |
1757 | */ | |
1758 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1759 | { | |
2f823ff8 | 1760 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
1761 | struct socket_smack *ssp; |
1762 | ||
1763 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1764 | if (ssp == NULL) | |
1765 | return -ENOMEM; | |
1766 | ||
2f823ff8 CS |
1767 | ssp->smk_in = skp->smk_known; |
1768 | ssp->smk_out = skp; | |
272cd7a8 | 1769 | ssp->smk_packet = NULL; |
e114e473 CS |
1770 | |
1771 | sk->sk_security = ssp; | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | /** | |
1777 | * smack_sk_free_security - Free a socket blob | |
1778 | * @sk: the socket | |
1779 | * | |
1780 | * Clears the blob pointer | |
1781 | */ | |
1782 | static void smack_sk_free_security(struct sock *sk) | |
1783 | { | |
1784 | kfree(sk->sk_security); | |
1785 | } | |
1786 | ||
07feee8f PM |
1787 | /** |
1788 | * smack_host_label - check host based restrictions | |
1789 | * @sip: the object end | |
1790 | * | |
1791 | * looks for host based access restrictions | |
1792 | * | |
1793 | * This version will only be appropriate for really small sets of single label | |
1794 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1795 | * taken before calling this function. | |
1796 | * | |
1797 | * Returns the label of the far end or NULL if it's not special. | |
1798 | */ | |
1799 | static char *smack_host_label(struct sockaddr_in *sip) | |
1800 | { | |
1801 | struct smk_netlbladdr *snp; | |
1802 | struct in_addr *siap = &sip->sin_addr; | |
1803 | ||
1804 | if (siap->s_addr == 0) | |
1805 | return NULL; | |
1806 | ||
1807 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1808 | /* | |
1809 | * we break after finding the first match because | |
1810 | * the list is sorted from longest to shortest mask | |
1811 | * so we have found the most specific match | |
1812 | */ | |
1813 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1814 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1815 | /* we have found the special CIPSO option */ | |
1816 | if (snp->smk_label == smack_cipso_option) | |
1817 | return NULL; | |
07feee8f | 1818 | return snp->smk_label; |
4303154e | 1819 | } |
07feee8f PM |
1820 | |
1821 | return NULL; | |
1822 | } | |
1823 | ||
e114e473 CS |
1824 | /** |
1825 | * smack_netlabel - Set the secattr on a socket | |
1826 | * @sk: the socket | |
6d3dc07c | 1827 | * @labeled: socket label scheme |
e114e473 CS |
1828 | * |
1829 | * Convert the outbound smack value (smk_out) to a | |
1830 | * secattr and attach it to the socket. | |
1831 | * | |
1832 | * Returns 0 on success or an error code | |
1833 | */ | |
6d3dc07c | 1834 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1835 | { |
f7112e6c | 1836 | struct smack_known *skp; |
07feee8f | 1837 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 1838 | int rc = 0; |
e114e473 | 1839 | |
6d3dc07c CS |
1840 | /* |
1841 | * Usually the netlabel code will handle changing the | |
1842 | * packet labeling based on the label. | |
1843 | * The case of a single label host is different, because | |
1844 | * a single label host should never get a labeled packet | |
1845 | * even though the label is usually associated with a packet | |
1846 | * label. | |
1847 | */ | |
1848 | local_bh_disable(); | |
1849 | bh_lock_sock_nested(sk); | |
1850 | ||
1851 | if (ssp->smk_out == smack_net_ambient || | |
1852 | labeled == SMACK_UNLABELED_SOCKET) | |
1853 | netlbl_sock_delattr(sk); | |
1854 | else { | |
2f823ff8 | 1855 | skp = ssp->smk_out; |
f7112e6c | 1856 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
1857 | } |
1858 | ||
1859 | bh_unlock_sock(sk); | |
1860 | local_bh_enable(); | |
4bc87e62 | 1861 | |
e114e473 CS |
1862 | return rc; |
1863 | } | |
1864 | ||
07feee8f PM |
1865 | /** |
1866 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1867 | * @sk: the socket | |
1868 | * @sap: the destination address | |
1869 | * | |
1870 | * Set the correct secattr for the given socket based on the destination | |
1871 | * address and perform any outbound access checks needed. | |
1872 | * | |
1873 | * Returns 0 on success or an error code. | |
1874 | * | |
1875 | */ | |
1876 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1877 | { | |
2f823ff8 | 1878 | struct smack_known *skp; |
07feee8f PM |
1879 | int rc; |
1880 | int sk_lbl; | |
1881 | char *hostsp; | |
1882 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1883 | struct smk_audit_info ad; |
07feee8f PM |
1884 | |
1885 | rcu_read_lock(); | |
1886 | hostsp = smack_host_label(sap); | |
1887 | if (hostsp != NULL) { | |
ecfcc53f | 1888 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
1889 | struct lsm_network_audit net; |
1890 | ||
48c62af6 EP |
1891 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
1892 | ad.a.u.net->family = sap->sin_family; | |
1893 | ad.a.u.net->dport = sap->sin_port; | |
1894 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 1895 | #endif |
923e9a13 | 1896 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 CS |
1897 | skp = ssp->smk_out; |
1898 | rc = smk_access(skp, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1899 | } else { |
1900 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1901 | rc = 0; | |
1902 | } | |
1903 | rcu_read_unlock(); | |
1904 | if (rc != 0) | |
1905 | return rc; | |
1906 | ||
1907 | return smack_netlabel(sk, sk_lbl); | |
1908 | } | |
1909 | ||
c6739443 CS |
1910 | /** |
1911 | * smk_ipv6_port_label - Smack port access table management | |
1912 | * @sock: socket | |
1913 | * @address: address | |
1914 | * | |
1915 | * Create or update the port list entry | |
1916 | */ | |
1917 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
1918 | { | |
1919 | struct sock *sk = sock->sk; | |
1920 | struct sockaddr_in6 *addr6; | |
1921 | struct socket_smack *ssp = sock->sk->sk_security; | |
1922 | struct smk_port_label *spp; | |
1923 | unsigned short port = 0; | |
1924 | ||
1925 | if (address == NULL) { | |
1926 | /* | |
1927 | * This operation is changing the Smack information | |
1928 | * on the bound socket. Take the changes to the port | |
1929 | * as well. | |
1930 | */ | |
1931 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
1932 | if (sk != spp->smk_sock) | |
1933 | continue; | |
1934 | spp->smk_in = ssp->smk_in; | |
1935 | spp->smk_out = ssp->smk_out; | |
1936 | return; | |
1937 | } | |
1938 | /* | |
1939 | * A NULL address is only used for updating existing | |
1940 | * bound entries. If there isn't one, it's OK. | |
1941 | */ | |
1942 | return; | |
1943 | } | |
1944 | ||
1945 | addr6 = (struct sockaddr_in6 *)address; | |
1946 | port = ntohs(addr6->sin6_port); | |
1947 | /* | |
1948 | * This is a special case that is safely ignored. | |
1949 | */ | |
1950 | if (port == 0) | |
1951 | return; | |
1952 | ||
1953 | /* | |
1954 | * Look for an existing port list entry. | |
1955 | * This is an indication that a port is getting reused. | |
1956 | */ | |
1957 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
1958 | if (spp->smk_port != port) | |
1959 | continue; | |
1960 | spp->smk_port = port; | |
1961 | spp->smk_sock = sk; | |
1962 | spp->smk_in = ssp->smk_in; | |
1963 | spp->smk_out = ssp->smk_out; | |
1964 | return; | |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * A new port entry is required. | |
1969 | */ | |
1970 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
1971 | if (spp == NULL) | |
1972 | return; | |
1973 | ||
1974 | spp->smk_port = port; | |
1975 | spp->smk_sock = sk; | |
1976 | spp->smk_in = ssp->smk_in; | |
1977 | spp->smk_out = ssp->smk_out; | |
1978 | ||
1979 | list_add(&spp->list, &smk_ipv6_port_list); | |
1980 | return; | |
1981 | } | |
1982 | ||
1983 | /** | |
1984 | * smk_ipv6_port_check - check Smack port access | |
1985 | * @sock: socket | |
1986 | * @address: address | |
1987 | * | |
1988 | * Create or update the port list entry | |
1989 | */ | |
6ea06247 | 1990 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
1991 | int act) |
1992 | { | |
1993 | __be16 *bep; | |
1994 | __be32 *be32p; | |
c6739443 CS |
1995 | struct smk_port_label *spp; |
1996 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 1997 | struct smack_known *skp; |
c6739443 | 1998 | unsigned short port = 0; |
c6739443 CS |
1999 | char *object; |
2000 | struct smk_audit_info ad; | |
2001 | #ifdef CONFIG_AUDIT | |
2002 | struct lsm_network_audit net; | |
2003 | #endif | |
2004 | ||
2005 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2006 | skp = smack_net_ambient; |
c6739443 CS |
2007 | object = ssp->smk_in; |
2008 | } else { | |
2f823ff8 CS |
2009 | skp = ssp->smk_out; |
2010 | object = smack_net_ambient->smk_known; | |
c6739443 CS |
2011 | } |
2012 | ||
2013 | /* | |
2014 | * Get the IP address and port from the address. | |
2015 | */ | |
6ea06247 CS |
2016 | port = ntohs(address->sin6_port); |
2017 | bep = (__be16 *)(&address->sin6_addr); | |
2018 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2019 | |
2020 | /* | |
2021 | * It's remote, so port lookup does no good. | |
2022 | */ | |
2023 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2024 | goto auditout; | |
2025 | ||
2026 | /* | |
2027 | * It's local so the send check has to have passed. | |
2028 | */ | |
2029 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2030 | skp = &smack_known_web; |
c6739443 CS |
2031 | goto auditout; |
2032 | } | |
2033 | ||
2034 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2035 | if (spp->smk_port != port) | |
2036 | continue; | |
2037 | object = spp->smk_in; | |
2038 | if (act == SMK_CONNECTING) | |
2f823ff8 | 2039 | ssp->smk_packet = spp->smk_out->smk_known; |
c6739443 CS |
2040 | break; |
2041 | } | |
2042 | ||
2043 | auditout: | |
2044 | ||
2045 | #ifdef CONFIG_AUDIT | |
2046 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2047 | ad.a.u.net->family = sk->sk_family; | |
2048 | ad.a.u.net->dport = port; | |
2049 | if (act == SMK_RECEIVING) | |
6ea06247 | 2050 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2051 | else |
6ea06247 | 2052 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2053 | #endif |
2f823ff8 | 2054 | return smk_access(skp, object, MAY_WRITE, &ad); |
c6739443 CS |
2055 | } |
2056 | ||
e114e473 CS |
2057 | /** |
2058 | * smack_inode_setsecurity - set smack xattrs | |
2059 | * @inode: the object | |
2060 | * @name: attribute name | |
2061 | * @value: attribute value | |
2062 | * @size: size of the attribute | |
2063 | * @flags: unused | |
2064 | * | |
2065 | * Sets the named attribute in the appropriate blob | |
2066 | * | |
2067 | * Returns 0 on success, or an error code | |
2068 | */ | |
2069 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2070 | const void *value, size_t size, int flags) | |
2071 | { | |
2f823ff8 | 2072 | struct smack_known *skp; |
e114e473 CS |
2073 | struct inode_smack *nsp = inode->i_security; |
2074 | struct socket_smack *ssp; | |
2075 | struct socket *sock; | |
4bc87e62 | 2076 | int rc = 0; |
e114e473 | 2077 | |
f7112e6c | 2078 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
e114e473 CS |
2079 | return -EACCES; |
2080 | ||
2f823ff8 CS |
2081 | skp = smk_import_entry(value, size); |
2082 | if (skp == NULL) | |
e114e473 CS |
2083 | return -EINVAL; |
2084 | ||
2085 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
2f823ff8 | 2086 | nsp->smk_inode = skp->smk_known; |
ddd29ec6 | 2087 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2088 | return 0; |
2089 | } | |
2090 | /* | |
2091 | * The rest of the Smack xattrs are only on sockets. | |
2092 | */ | |
2093 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2094 | return -EOPNOTSUPP; | |
2095 | ||
2096 | sock = SOCKET_I(inode); | |
2e1d146a | 2097 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2098 | return -EOPNOTSUPP; |
2099 | ||
2100 | ssp = sock->sk->sk_security; | |
2101 | ||
2102 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
2f823ff8 | 2103 | ssp->smk_in = skp->smk_known; |
e114e473 | 2104 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2105 | ssp->smk_out = skp; |
c6739443 | 2106 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2107 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2108 | if (rc != 0) | |
2109 | printk(KERN_WARNING | |
2110 | "Smack: \"%s\" netlbl error %d.\n", | |
2111 | __func__, -rc); | |
2112 | } | |
e114e473 CS |
2113 | } else |
2114 | return -EOPNOTSUPP; | |
2115 | ||
c6739443 CS |
2116 | if (sock->sk->sk_family == PF_INET6) |
2117 | smk_ipv6_port_label(sock, NULL); | |
2118 | ||
e114e473 CS |
2119 | return 0; |
2120 | } | |
2121 | ||
2122 | /** | |
2123 | * smack_socket_post_create - finish socket setup | |
2124 | * @sock: the socket | |
2125 | * @family: protocol family | |
2126 | * @type: unused | |
2127 | * @protocol: unused | |
2128 | * @kern: unused | |
2129 | * | |
2130 | * Sets the netlabel information on the socket | |
2131 | * | |
2132 | * Returns 0 on success, and error code otherwise | |
2133 | */ | |
2134 | static int smack_socket_post_create(struct socket *sock, int family, | |
2135 | int type, int protocol, int kern) | |
2136 | { | |
2e1d146a | 2137 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2138 | return 0; |
2139 | /* | |
2140 | * Set the outbound netlbl. | |
2141 | */ | |
6d3dc07c CS |
2142 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2143 | } | |
2144 | ||
c6739443 CS |
2145 | /** |
2146 | * smack_socket_bind - record port binding information. | |
2147 | * @sock: the socket | |
2148 | * @address: the port address | |
2149 | * @addrlen: size of the address | |
2150 | * | |
2151 | * Records the label bound to a port. | |
2152 | * | |
2153 | * Returns 0 | |
2154 | */ | |
2155 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2156 | int addrlen) | |
2157 | { | |
2158 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2159 | smk_ipv6_port_label(sock, address); | |
2160 | ||
2161 | return 0; | |
2162 | } | |
2163 | ||
6d3dc07c CS |
2164 | /** |
2165 | * smack_socket_connect - connect access check | |
2166 | * @sock: the socket | |
2167 | * @sap: the other end | |
2168 | * @addrlen: size of sap | |
2169 | * | |
2170 | * Verifies that a connection may be possible | |
2171 | * | |
2172 | * Returns 0 on success, and error code otherwise | |
2173 | */ | |
2174 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2175 | int addrlen) | |
2176 | { | |
c6739443 CS |
2177 | int rc = 0; |
2178 | ||
2179 | if (sock->sk == NULL) | |
6d3dc07c | 2180 | return 0; |
6d3dc07c | 2181 | |
c6739443 CS |
2182 | switch (sock->sk->sk_family) { |
2183 | case PF_INET: | |
2184 | if (addrlen < sizeof(struct sockaddr_in)) | |
2185 | return -EINVAL; | |
2186 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2187 | break; | |
2188 | case PF_INET6: | |
2189 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2190 | return -EINVAL; | |
6ea06247 CS |
2191 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2192 | SMK_CONNECTING); | |
c6739443 CS |
2193 | break; |
2194 | } | |
2195 | return rc; | |
e114e473 CS |
2196 | } |
2197 | ||
2198 | /** | |
2199 | * smack_flags_to_may - convert S_ to MAY_ values | |
2200 | * @flags: the S_ value | |
2201 | * | |
2202 | * Returns the equivalent MAY_ value | |
2203 | */ | |
2204 | static int smack_flags_to_may(int flags) | |
2205 | { | |
2206 | int may = 0; | |
2207 | ||
2208 | if (flags & S_IRUGO) | |
2209 | may |= MAY_READ; | |
2210 | if (flags & S_IWUGO) | |
2211 | may |= MAY_WRITE; | |
2212 | if (flags & S_IXUGO) | |
2213 | may |= MAY_EXEC; | |
2214 | ||
2215 | return may; | |
2216 | } | |
2217 | ||
2218 | /** | |
2219 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2220 | * @msg: the object | |
2221 | * | |
2222 | * Returns 0 | |
2223 | */ | |
2224 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2225 | { | |
2f823ff8 CS |
2226 | struct smack_known *skp = smk_of_current(); |
2227 | ||
2228 | msg->security = skp->smk_known; | |
e114e473 CS |
2229 | return 0; |
2230 | } | |
2231 | ||
2232 | /** | |
2233 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2234 | * @msg: the object | |
2235 | * | |
2236 | * Clears the blob pointer | |
2237 | */ | |
2238 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2239 | { | |
2240 | msg->security = NULL; | |
2241 | } | |
2242 | ||
2243 | /** | |
2244 | * smack_of_shm - the smack pointer for the shm | |
2245 | * @shp: the object | |
2246 | * | |
2247 | * Returns a pointer to the smack value | |
2248 | */ | |
2249 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2250 | { | |
2251 | return (char *)shp->shm_perm.security; | |
2252 | } | |
2253 | ||
2254 | /** | |
2255 | * smack_shm_alloc_security - Set the security blob for shm | |
2256 | * @shp: the object | |
2257 | * | |
2258 | * Returns 0 | |
2259 | */ | |
2260 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2261 | { | |
2262 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2263 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2264 | |
2f823ff8 | 2265 | isp->security = skp->smk_known; |
e114e473 CS |
2266 | return 0; |
2267 | } | |
2268 | ||
2269 | /** | |
2270 | * smack_shm_free_security - Clear the security blob for shm | |
2271 | * @shp: the object | |
2272 | * | |
2273 | * Clears the blob pointer | |
2274 | */ | |
2275 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2276 | { | |
2277 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2278 | ||
2279 | isp->security = NULL; | |
2280 | } | |
2281 | ||
ecfcc53f EB |
2282 | /** |
2283 | * smk_curacc_shm : check if current has access on shm | |
2284 | * @shp : the object | |
2285 | * @access : access requested | |
2286 | * | |
2287 | * Returns 0 if current has the requested access, error code otherwise | |
2288 | */ | |
2289 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2290 | { | |
2291 | char *ssp = smack_of_shm(shp); | |
2292 | struct smk_audit_info ad; | |
2293 | ||
2294 | #ifdef CONFIG_AUDIT | |
2295 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2296 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2297 | #endif | |
2298 | return smk_curacc(ssp, access, &ad); | |
2299 | } | |
2300 | ||
e114e473 CS |
2301 | /** |
2302 | * smack_shm_associate - Smack access check for shm | |
2303 | * @shp: the object | |
2304 | * @shmflg: access requested | |
2305 | * | |
2306 | * Returns 0 if current has the requested access, error code otherwise | |
2307 | */ | |
2308 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2309 | { | |
e114e473 CS |
2310 | int may; |
2311 | ||
2312 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2313 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2314 | } |
2315 | ||
2316 | /** | |
2317 | * smack_shm_shmctl - Smack access check for shm | |
2318 | * @shp: the object | |
2319 | * @cmd: what it wants to do | |
2320 | * | |
2321 | * Returns 0 if current has the requested access, error code otherwise | |
2322 | */ | |
2323 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2324 | { | |
e114e473 CS |
2325 | int may; |
2326 | ||
2327 | switch (cmd) { | |
2328 | case IPC_STAT: | |
2329 | case SHM_STAT: | |
2330 | may = MAY_READ; | |
2331 | break; | |
2332 | case IPC_SET: | |
2333 | case SHM_LOCK: | |
2334 | case SHM_UNLOCK: | |
2335 | case IPC_RMID: | |
2336 | may = MAY_READWRITE; | |
2337 | break; | |
2338 | case IPC_INFO: | |
2339 | case SHM_INFO: | |
2340 | /* | |
2341 | * System level information. | |
2342 | */ | |
2343 | return 0; | |
2344 | default: | |
2345 | return -EINVAL; | |
2346 | } | |
ecfcc53f | 2347 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2348 | } |
2349 | ||
2350 | /** | |
2351 | * smack_shm_shmat - Smack access for shmat | |
2352 | * @shp: the object | |
2353 | * @shmaddr: unused | |
2354 | * @shmflg: access requested | |
2355 | * | |
2356 | * Returns 0 if current has the requested access, error code otherwise | |
2357 | */ | |
2358 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2359 | int shmflg) | |
2360 | { | |
e114e473 CS |
2361 | int may; |
2362 | ||
2363 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2364 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2365 | } |
2366 | ||
2367 | /** | |
2368 | * smack_of_sem - the smack pointer for the sem | |
2369 | * @sma: the object | |
2370 | * | |
2371 | * Returns a pointer to the smack value | |
2372 | */ | |
2373 | static char *smack_of_sem(struct sem_array *sma) | |
2374 | { | |
2375 | return (char *)sma->sem_perm.security; | |
2376 | } | |
2377 | ||
2378 | /** | |
2379 | * smack_sem_alloc_security - Set the security blob for sem | |
2380 | * @sma: the object | |
2381 | * | |
2382 | * Returns 0 | |
2383 | */ | |
2384 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2385 | { | |
2386 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2387 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2388 | |
2f823ff8 | 2389 | isp->security = skp->smk_known; |
e114e473 CS |
2390 | return 0; |
2391 | } | |
2392 | ||
2393 | /** | |
2394 | * smack_sem_free_security - Clear the security blob for sem | |
2395 | * @sma: the object | |
2396 | * | |
2397 | * Clears the blob pointer | |
2398 | */ | |
2399 | static void smack_sem_free_security(struct sem_array *sma) | |
2400 | { | |
2401 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2402 | ||
2403 | isp->security = NULL; | |
2404 | } | |
2405 | ||
ecfcc53f EB |
2406 | /** |
2407 | * smk_curacc_sem : check if current has access on sem | |
2408 | * @sma : the object | |
2409 | * @access : access requested | |
2410 | * | |
2411 | * Returns 0 if current has the requested access, error code otherwise | |
2412 | */ | |
2413 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2414 | { | |
2415 | char *ssp = smack_of_sem(sma); | |
2416 | struct smk_audit_info ad; | |
2417 | ||
2418 | #ifdef CONFIG_AUDIT | |
2419 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2420 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2421 | #endif | |
2422 | return smk_curacc(ssp, access, &ad); | |
2423 | } | |
2424 | ||
e114e473 CS |
2425 | /** |
2426 | * smack_sem_associate - Smack access check for sem | |
2427 | * @sma: the object | |
2428 | * @semflg: access requested | |
2429 | * | |
2430 | * Returns 0 if current has the requested access, error code otherwise | |
2431 | */ | |
2432 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2433 | { | |
e114e473 CS |
2434 | int may; |
2435 | ||
2436 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2437 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2438 | } |
2439 | ||
2440 | /** | |
2441 | * smack_sem_shmctl - Smack access check for sem | |
2442 | * @sma: the object | |
2443 | * @cmd: what it wants to do | |
2444 | * | |
2445 | * Returns 0 if current has the requested access, error code otherwise | |
2446 | */ | |
2447 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2448 | { | |
e114e473 CS |
2449 | int may; |
2450 | ||
2451 | switch (cmd) { | |
2452 | case GETPID: | |
2453 | case GETNCNT: | |
2454 | case GETZCNT: | |
2455 | case GETVAL: | |
2456 | case GETALL: | |
2457 | case IPC_STAT: | |
2458 | case SEM_STAT: | |
2459 | may = MAY_READ; | |
2460 | break; | |
2461 | case SETVAL: | |
2462 | case SETALL: | |
2463 | case IPC_RMID: | |
2464 | case IPC_SET: | |
2465 | may = MAY_READWRITE; | |
2466 | break; | |
2467 | case IPC_INFO: | |
2468 | case SEM_INFO: | |
2469 | /* | |
2470 | * System level information | |
2471 | */ | |
2472 | return 0; | |
2473 | default: | |
2474 | return -EINVAL; | |
2475 | } | |
2476 | ||
ecfcc53f | 2477 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2478 | } |
2479 | ||
2480 | /** | |
2481 | * smack_sem_semop - Smack checks of semaphore operations | |
2482 | * @sma: the object | |
2483 | * @sops: unused | |
2484 | * @nsops: unused | |
2485 | * @alter: unused | |
2486 | * | |
2487 | * Treated as read and write in all cases. | |
2488 | * | |
2489 | * Returns 0 if access is allowed, error code otherwise | |
2490 | */ | |
2491 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2492 | unsigned nsops, int alter) | |
2493 | { | |
ecfcc53f | 2494 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2495 | } |
2496 | ||
2497 | /** | |
2498 | * smack_msg_alloc_security - Set the security blob for msg | |
2499 | * @msq: the object | |
2500 | * | |
2501 | * Returns 0 | |
2502 | */ | |
2503 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2504 | { | |
2505 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2506 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2507 | |
2f823ff8 | 2508 | kisp->security = skp->smk_known; |
e114e473 CS |
2509 | return 0; |
2510 | } | |
2511 | ||
2512 | /** | |
2513 | * smack_msg_free_security - Clear the security blob for msg | |
2514 | * @msq: the object | |
2515 | * | |
2516 | * Clears the blob pointer | |
2517 | */ | |
2518 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2519 | { | |
2520 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2521 | ||
2522 | kisp->security = NULL; | |
2523 | } | |
2524 | ||
2525 | /** | |
2526 | * smack_of_msq - the smack pointer for the msq | |
2527 | * @msq: the object | |
2528 | * | |
2529 | * Returns a pointer to the smack value | |
2530 | */ | |
2531 | static char *smack_of_msq(struct msg_queue *msq) | |
2532 | { | |
2533 | return (char *)msq->q_perm.security; | |
2534 | } | |
2535 | ||
ecfcc53f EB |
2536 | /** |
2537 | * smk_curacc_msq : helper to check if current has access on msq | |
2538 | * @msq : the msq | |
2539 | * @access : access requested | |
2540 | * | |
2541 | * return 0 if current has access, error otherwise | |
2542 | */ | |
2543 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2544 | { | |
2545 | char *msp = smack_of_msq(msq); | |
2546 | struct smk_audit_info ad; | |
2547 | ||
2548 | #ifdef CONFIG_AUDIT | |
2549 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2550 | ad.a.u.ipc_id = msq->q_perm.id; | |
2551 | #endif | |
2552 | return smk_curacc(msp, access, &ad); | |
2553 | } | |
2554 | ||
e114e473 CS |
2555 | /** |
2556 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2557 | * @msq: the object | |
2558 | * @msqflg: access requested | |
2559 | * | |
2560 | * Returns 0 if current has the requested access, error code otherwise | |
2561 | */ | |
2562 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2563 | { | |
e114e473 CS |
2564 | int may; |
2565 | ||
2566 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2567 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2568 | } |
2569 | ||
2570 | /** | |
2571 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2572 | * @msq: the object | |
2573 | * @cmd: what it wants to do | |
2574 | * | |
2575 | * Returns 0 if current has the requested access, error code otherwise | |
2576 | */ | |
2577 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2578 | { | |
e114e473 CS |
2579 | int may; |
2580 | ||
2581 | switch (cmd) { | |
2582 | case IPC_STAT: | |
2583 | case MSG_STAT: | |
2584 | may = MAY_READ; | |
2585 | break; | |
2586 | case IPC_SET: | |
2587 | case IPC_RMID: | |
2588 | may = MAY_READWRITE; | |
2589 | break; | |
2590 | case IPC_INFO: | |
2591 | case MSG_INFO: | |
2592 | /* | |
2593 | * System level information | |
2594 | */ | |
2595 | return 0; | |
2596 | default: | |
2597 | return -EINVAL; | |
2598 | } | |
2599 | ||
ecfcc53f | 2600 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2601 | } |
2602 | ||
2603 | /** | |
2604 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2605 | * @msq: the object | |
2606 | * @msg: unused | |
2607 | * @msqflg: access requested | |
2608 | * | |
2609 | * Returns 0 if current has the requested access, error code otherwise | |
2610 | */ | |
2611 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2612 | int msqflg) | |
2613 | { | |
ecfcc53f | 2614 | int may; |
e114e473 | 2615 | |
ecfcc53f EB |
2616 | may = smack_flags_to_may(msqflg); |
2617 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2618 | } |
2619 | ||
2620 | /** | |
2621 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2622 | * @msq: the object | |
2623 | * @msg: unused | |
2624 | * @target: unused | |
2625 | * @type: unused | |
2626 | * @mode: unused | |
2627 | * | |
2628 | * Returns 0 if current has read and write access, error code otherwise | |
2629 | */ | |
2630 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2631 | struct task_struct *target, long type, int mode) | |
2632 | { | |
ecfcc53f | 2633 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2634 | } |
2635 | ||
2636 | /** | |
2637 | * smack_ipc_permission - Smack access for ipc_permission() | |
2638 | * @ipp: the object permissions | |
2639 | * @flag: access requested | |
2640 | * | |
2641 | * Returns 0 if current has read and write access, error code otherwise | |
2642 | */ | |
2643 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2644 | { | |
2645 | char *isp = ipp->security; | |
ecfcc53f EB |
2646 | int may = smack_flags_to_may(flag); |
2647 | struct smk_audit_info ad; | |
e114e473 | 2648 | |
ecfcc53f EB |
2649 | #ifdef CONFIG_AUDIT |
2650 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2651 | ad.a.u.ipc_id = ipp->id; | |
2652 | #endif | |
2653 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2654 | } |
2655 | ||
d20bdda6 AD |
2656 | /** |
2657 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2658 | * @ipp: the object permissions |
d20bdda6 AD |
2659 | * @secid: where result will be saved |
2660 | */ | |
2661 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2662 | { | |
2663 | char *smack = ipp->security; | |
2664 | ||
2665 | *secid = smack_to_secid(smack); | |
2666 | } | |
2667 | ||
e114e473 CS |
2668 | /** |
2669 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2670 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2671 | * @inode: the object |
2672 | * | |
2673 | * Set the inode's security blob if it hasn't been done already. | |
2674 | */ | |
2675 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2676 | { | |
2677 | struct super_block *sbp; | |
2678 | struct superblock_smack *sbsp; | |
2679 | struct inode_smack *isp; | |
2f823ff8 CS |
2680 | struct smack_known *skp; |
2681 | struct smack_known *ckp = smk_of_current(); | |
e114e473 | 2682 | char *final; |
5c6d1125 JS |
2683 | char trattr[TRANS_TRUE_SIZE]; |
2684 | int transflag = 0; | |
2267b13a | 2685 | int rc; |
e114e473 CS |
2686 | struct dentry *dp; |
2687 | ||
2688 | if (inode == NULL) | |
2689 | return; | |
2690 | ||
2691 | isp = inode->i_security; | |
2692 | ||
2693 | mutex_lock(&isp->smk_lock); | |
2694 | /* | |
2695 | * If the inode is already instantiated | |
2696 | * take the quick way out | |
2697 | */ | |
2698 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2699 | goto unlockandout; | |
2700 | ||
2701 | sbp = inode->i_sb; | |
2702 | sbsp = sbp->s_security; | |
2703 | /* | |
2704 | * We're going to use the superblock default label | |
2705 | * if there's no label on the file. | |
2706 | */ | |
2707 | final = sbsp->smk_default; | |
2708 | ||
e97dcb0e CS |
2709 | /* |
2710 | * If this is the root inode the superblock | |
2711 | * may be in the process of initialization. | |
2712 | * If that is the case use the root value out | |
2713 | * of the superblock. | |
2714 | */ | |
2715 | if (opt_dentry->d_parent == opt_dentry) { | |
2716 | isp->smk_inode = sbsp->smk_root; | |
2717 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2718 | goto unlockandout; | |
2719 | } | |
2720 | ||
e114e473 CS |
2721 | /* |
2722 | * This is pretty hackish. | |
2723 | * Casey says that we shouldn't have to do | |
2724 | * file system specific code, but it does help | |
2725 | * with keeping it simple. | |
2726 | */ | |
2727 | switch (sbp->s_magic) { | |
2728 | case SMACK_MAGIC: | |
2729 | /* | |
25985edc | 2730 | * Casey says that it's a little embarrassing |
e114e473 CS |
2731 | * that the smack file system doesn't do |
2732 | * extended attributes. | |
2733 | */ | |
2734 | final = smack_known_star.smk_known; | |
2735 | break; | |
2736 | case PIPEFS_MAGIC: | |
2737 | /* | |
2738 | * Casey says pipes are easy (?) | |
2739 | */ | |
2740 | final = smack_known_star.smk_known; | |
2741 | break; | |
2742 | case DEVPTS_SUPER_MAGIC: | |
2743 | /* | |
2744 | * devpts seems content with the label of the task. | |
2745 | * Programs that change smack have to treat the | |
2746 | * pty with respect. | |
2747 | */ | |
2f823ff8 | 2748 | final = ckp->smk_known; |
e114e473 CS |
2749 | break; |
2750 | case SOCKFS_MAGIC: | |
2751 | /* | |
b4e0d5f0 CS |
2752 | * Socket access is controlled by the socket |
2753 | * structures associated with the task involved. | |
e114e473 | 2754 | */ |
b4e0d5f0 | 2755 | final = smack_known_star.smk_known; |
e114e473 CS |
2756 | break; |
2757 | case PROC_SUPER_MAGIC: | |
2758 | /* | |
2759 | * Casey says procfs appears not to care. | |
2760 | * The superblock default suffices. | |
2761 | */ | |
2762 | break; | |
2763 | case TMPFS_MAGIC: | |
2764 | /* | |
2765 | * Device labels should come from the filesystem, | |
2766 | * but watch out, because they're volitile, | |
2767 | * getting recreated on every reboot. | |
2768 | */ | |
2769 | final = smack_known_star.smk_known; | |
2770 | /* | |
2771 | * No break. | |
2772 | * | |
2773 | * If a smack value has been set we want to use it, | |
2774 | * but since tmpfs isn't giving us the opportunity | |
2775 | * to set mount options simulate setting the | |
2776 | * superblock default. | |
2777 | */ | |
2778 | default: | |
2779 | /* | |
2780 | * This isn't an understood special case. | |
2781 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2782 | */ |
2783 | ||
2784 | /* | |
2785 | * UNIX domain sockets use lower level socket data. | |
2786 | */ | |
2787 | if (S_ISSOCK(inode->i_mode)) { | |
2788 | final = smack_known_star.smk_known; | |
2789 | break; | |
2790 | } | |
2791 | /* | |
e114e473 CS |
2792 | * No xattr support means, alas, no SMACK label. |
2793 | * Use the aforeapplied default. | |
2794 | * It would be curious if the label of the task | |
2795 | * does not match that assigned. | |
2796 | */ | |
2797 | if (inode->i_op->getxattr == NULL) | |
2798 | break; | |
2799 | /* | |
2800 | * Get the dentry for xattr. | |
2801 | */ | |
3e62cbb8 | 2802 | dp = dget(opt_dentry); |
2f823ff8 CS |
2803 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
2804 | if (skp != NULL) | |
2805 | final = skp->smk_known; | |
2267b13a CS |
2806 | |
2807 | /* | |
2808 | * Transmuting directory | |
2809 | */ | |
2810 | if (S_ISDIR(inode->i_mode)) { | |
2811 | /* | |
2812 | * If this is a new directory and the label was | |
2813 | * transmuted when the inode was initialized | |
2814 | * set the transmute attribute on the directory | |
2815 | * and mark the inode. | |
2816 | * | |
2817 | * If there is a transmute attribute on the | |
2818 | * directory mark the inode. | |
2819 | */ | |
2820 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
2821 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
2822 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 2823 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
2824 | TRANS_TRUE, TRANS_TRUE_SIZE, |
2825 | 0); | |
2826 | } else { | |
2827 | rc = inode->i_op->getxattr(dp, | |
2828 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
2829 | TRANS_TRUE_SIZE); | |
2830 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
2831 | TRANS_TRUE_SIZE) != 0) | |
2832 | rc = -EINVAL; | |
5c6d1125 | 2833 | } |
2267b13a CS |
2834 | if (rc >= 0) |
2835 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 2836 | } |
19760ad0 CS |
2837 | /* |
2838 | * Don't let the exec or mmap label be "*" or "@". | |
2839 | */ | |
2840 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
2841 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2842 | skp = NULL; | |
2843 | isp->smk_task = skp; | |
2844 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); | |
2845 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2846 | skp = NULL; | |
2847 | isp->smk_mmap = skp; | |
676dac4b | 2848 | |
e114e473 CS |
2849 | dput(dp); |
2850 | break; | |
2851 | } | |
2852 | ||
2853 | if (final == NULL) | |
2f823ff8 | 2854 | isp->smk_inode = ckp->smk_known; |
e114e473 CS |
2855 | else |
2856 | isp->smk_inode = final; | |
2857 | ||
5c6d1125 | 2858 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2859 | |
2860 | unlockandout: | |
2861 | mutex_unlock(&isp->smk_lock); | |
2862 | return; | |
2863 | } | |
2864 | ||
2865 | /** | |
2866 | * smack_getprocattr - Smack process attribute access | |
2867 | * @p: the object task | |
2868 | * @name: the name of the attribute in /proc/.../attr | |
2869 | * @value: where to put the result | |
2870 | * | |
2871 | * Places a copy of the task Smack into value | |
2872 | * | |
2873 | * Returns the length of the smack label or an error code | |
2874 | */ | |
2875 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2876 | { | |
2f823ff8 | 2877 | struct smack_known *skp = smk_of_task(task_security(p)); |
e114e473 CS |
2878 | char *cp; |
2879 | int slen; | |
2880 | ||
2881 | if (strcmp(name, "current") != 0) | |
2882 | return -EINVAL; | |
2883 | ||
2f823ff8 | 2884 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
2885 | if (cp == NULL) |
2886 | return -ENOMEM; | |
2887 | ||
2888 | slen = strlen(cp); | |
2889 | *value = cp; | |
2890 | return slen; | |
2891 | } | |
2892 | ||
2893 | /** | |
2894 | * smack_setprocattr - Smack process attribute setting | |
2895 | * @p: the object task | |
2896 | * @name: the name of the attribute in /proc/.../attr | |
2897 | * @value: the value to set | |
2898 | * @size: the size of the value | |
2899 | * | |
2900 | * Sets the Smack value of the task. Only setting self | |
2901 | * is permitted and only with privilege | |
2902 | * | |
2903 | * Returns the length of the smack label or an error code | |
2904 | */ | |
2905 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2906 | void *value, size_t size) | |
2907 | { | |
676dac4b | 2908 | struct task_smack *tsp; |
d84f4f99 | 2909 | struct cred *new; |
2f823ff8 | 2910 | struct smack_known *skp; |
e114e473 | 2911 | |
e114e473 CS |
2912 | /* |
2913 | * Changing another process' Smack value is too dangerous | |
2914 | * and supports no sane use case. | |
2915 | */ | |
2916 | if (p != current) | |
2917 | return -EPERM; | |
2918 | ||
1880eff7 | 2919 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
2920 | return -EPERM; |
2921 | ||
f7112e6c | 2922 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
2923 | return -EINVAL; |
2924 | ||
2925 | if (strcmp(name, "current") != 0) | |
2926 | return -EINVAL; | |
2927 | ||
2f823ff8 CS |
2928 | skp = smk_import_entry(value, size); |
2929 | if (skp == NULL) | |
e114e473 CS |
2930 | return -EINVAL; |
2931 | ||
6d3dc07c CS |
2932 | /* |
2933 | * No process is ever allowed the web ("@") label. | |
2934 | */ | |
2f823ff8 | 2935 | if (skp == &smack_known_web) |
6d3dc07c CS |
2936 | return -EPERM; |
2937 | ||
d84f4f99 | 2938 | new = prepare_creds(); |
6d3dc07c | 2939 | if (new == NULL) |
d84f4f99 | 2940 | return -ENOMEM; |
7898e1f8 | 2941 | |
46a2f3b9 | 2942 | tsp = new->security; |
2f823ff8 | 2943 | tsp->smk_task = skp; |
7898e1f8 | 2944 | |
d84f4f99 | 2945 | commit_creds(new); |
e114e473 CS |
2946 | return size; |
2947 | } | |
2948 | ||
2949 | /** | |
2950 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2951 | * @sock: one sock |
2952 | * @other: the other sock | |
e114e473 CS |
2953 | * @newsk: unused |
2954 | * | |
2955 | * Return 0 if a subject with the smack of sock could access | |
2956 | * an object with the smack of other, otherwise an error code | |
2957 | */ | |
3610cda5 DM |
2958 | static int smack_unix_stream_connect(struct sock *sock, |
2959 | struct sock *other, struct sock *newsk) | |
e114e473 | 2960 | { |
2f823ff8 | 2961 | struct smack_known *skp; |
d2e7ad19 JM |
2962 | struct socket_smack *ssp = sock->sk_security; |
2963 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2964 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2965 | struct smk_audit_info ad; |
b4e0d5f0 | 2966 | int rc = 0; |
e114e473 | 2967 | |
923e9a13 KC |
2968 | #ifdef CONFIG_AUDIT |
2969 | struct lsm_network_audit net; | |
2970 | ||
48c62af6 | 2971 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3610cda5 | 2972 | smk_ad_setfield_u_net_sk(&ad, other); |
923e9a13 | 2973 | #endif |
b4e0d5f0 | 2974 | |
2f823ff8 CS |
2975 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
2976 | skp = ssp->smk_out; | |
2977 | rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad); | |
2978 | } | |
b4e0d5f0 | 2979 | |
975d5e55 CS |
2980 | /* |
2981 | * Cross reference the peer labels for SO_PEERSEC. | |
2982 | */ | |
2983 | if (rc == 0) { | |
2f823ff8 CS |
2984 | nsp->smk_packet = ssp->smk_out->smk_known; |
2985 | ssp->smk_packet = osp->smk_out->smk_known; | |
975d5e55 CS |
2986 | } |
2987 | ||
b4e0d5f0 | 2988 | return rc; |
e114e473 CS |
2989 | } |
2990 | ||
2991 | /** | |
2992 | * smack_unix_may_send - Smack access on UDS | |
2993 | * @sock: one socket | |
2994 | * @other: the other socket | |
2995 | * | |
2996 | * Return 0 if a subject with the smack of sock could access | |
2997 | * an object with the smack of other, otherwise an error code | |
2998 | */ | |
2999 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3000 | { | |
b4e0d5f0 CS |
3001 | struct socket_smack *ssp = sock->sk->sk_security; |
3002 | struct socket_smack *osp = other->sk->sk_security; | |
2f823ff8 | 3003 | struct smack_known *skp; |
ecfcc53f | 3004 | struct smk_audit_info ad; |
e114e473 | 3005 | |
923e9a13 KC |
3006 | #ifdef CONFIG_AUDIT |
3007 | struct lsm_network_audit net; | |
3008 | ||
48c62af6 | 3009 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3010 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3011 | #endif |
b4e0d5f0 | 3012 | |
2f823ff8 CS |
3013 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3014 | return 0; | |
b4e0d5f0 | 3015 | |
2f823ff8 CS |
3016 | skp = ssp->smk_out; |
3017 | return smk_access(skp, osp->smk_in, MAY_WRITE, &ad); | |
e114e473 CS |
3018 | } |
3019 | ||
6d3dc07c CS |
3020 | /** |
3021 | * smack_socket_sendmsg - Smack check based on destination host | |
3022 | * @sock: the socket | |
251a2a95 | 3023 | * @msg: the message |
6d3dc07c CS |
3024 | * @size: the size of the message |
3025 | * | |
c6739443 CS |
3026 | * Return 0 if the current subject can write to the destination host. |
3027 | * For IPv4 this is only a question if the destination is a single label host. | |
3028 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3029 | */ |
3030 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3031 | int size) | |
3032 | { | |
3033 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6ea06247 | 3034 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
c6739443 | 3035 | int rc = 0; |
6d3dc07c CS |
3036 | |
3037 | /* | |
3038 | * Perfectly reasonable for this to be NULL | |
3039 | */ | |
c6739443 | 3040 | if (sip == NULL) |
6d3dc07c CS |
3041 | return 0; |
3042 | ||
c6739443 CS |
3043 | switch (sip->sin_family) { |
3044 | case AF_INET: | |
3045 | rc = smack_netlabel_send(sock->sk, sip); | |
3046 | break; | |
3047 | case AF_INET6: | |
3048 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); | |
3049 | break; | |
3050 | } | |
3051 | return rc; | |
6d3dc07c CS |
3052 | } |
3053 | ||
e114e473 | 3054 | /** |
251a2a95 | 3055 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3056 | * @sap: netlabel secattr |
272cd7a8 | 3057 | * @ssp: socket security information |
e114e473 | 3058 | * |
2f823ff8 | 3059 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3060 | */ |
2f823ff8 CS |
3061 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3062 | struct socket_smack *ssp) | |
e114e473 | 3063 | { |
2f823ff8 | 3064 | struct smack_known *skp; |
f7112e6c | 3065 | int found = 0; |
677264e8 CS |
3066 | int acat; |
3067 | int kcat; | |
e114e473 | 3068 | |
6d3dc07c | 3069 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3070 | /* |
6d3dc07c | 3071 | * Looks like a CIPSO packet. |
e114e473 CS |
3072 | * If there are flags but no level netlabel isn't |
3073 | * behaving the way we expect it to. | |
3074 | * | |
f7112e6c | 3075 | * Look it up in the label table |
e114e473 CS |
3076 | * Without guidance regarding the smack value |
3077 | * for the packet fall back on the network | |
3078 | * ambient value. | |
3079 | */ | |
f7112e6c | 3080 | rcu_read_lock(); |
2f823ff8 CS |
3081 | list_for_each_entry(skp, &smack_known_list, list) { |
3082 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3083 | continue; |
677264e8 CS |
3084 | /* |
3085 | * Compare the catsets. Use the netlbl APIs. | |
3086 | */ | |
3087 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3088 | if ((skp->smk_netlabel.flags & | |
3089 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3090 | found = 1; | |
3091 | break; | |
3092 | } | |
3093 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
3094 | acat = netlbl_secattr_catmap_walk( | |
3095 | sap->attr.mls.cat, acat + 1); | |
3096 | kcat = netlbl_secattr_catmap_walk( | |
3097 | skp->smk_netlabel.attr.mls.cat, | |
3098 | kcat + 1); | |
3099 | if (acat < 0 || kcat < 0) | |
3100 | break; | |
3101 | } | |
3102 | if (acat == kcat) { | |
3103 | found = 1; | |
3104 | break; | |
3105 | } | |
6d3dc07c | 3106 | } |
f7112e6c CS |
3107 | rcu_read_unlock(); |
3108 | ||
3109 | if (found) | |
2f823ff8 | 3110 | return skp; |
f7112e6c | 3111 | |
272cd7a8 | 3112 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) |
2f823ff8 CS |
3113 | return &smack_known_web; |
3114 | return &smack_known_star; | |
e114e473 | 3115 | } |
6d3dc07c CS |
3116 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3117 | /* | |
3118 | * Looks like a fallback, which gives us a secid. | |
3119 | */ | |
2f823ff8 | 3120 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3121 | /* |
3122 | * This has got to be a bug because it is | |
3123 | * impossible to specify a fallback without | |
3124 | * specifying the label, which will ensure | |
3125 | * it has a secid, and the only way to get a | |
3126 | * secid is from a fallback. | |
3127 | */ | |
2f823ff8 CS |
3128 | BUG_ON(skp == NULL); |
3129 | return skp; | |
e114e473 CS |
3130 | } |
3131 | /* | |
6d3dc07c CS |
3132 | * Without guidance regarding the smack value |
3133 | * for the packet fall back on the network | |
3134 | * ambient value. | |
e114e473 | 3135 | */ |
272cd7a8 | 3136 | return smack_net_ambient; |
e114e473 CS |
3137 | } |
3138 | ||
6ea06247 | 3139 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3140 | { |
c6739443 CS |
3141 | u8 nexthdr; |
3142 | int offset; | |
3143 | int proto = -EINVAL; | |
3144 | struct ipv6hdr _ipv6h; | |
3145 | struct ipv6hdr *ip6; | |
3146 | __be16 frag_off; | |
3147 | struct tcphdr _tcph, *th; | |
3148 | struct udphdr _udph, *uh; | |
3149 | struct dccp_hdr _dccph, *dh; | |
3150 | ||
3151 | sip->sin6_port = 0; | |
3152 | ||
3153 | offset = skb_network_offset(skb); | |
3154 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3155 | if (ip6 == NULL) | |
3156 | return -EINVAL; | |
3157 | sip->sin6_addr = ip6->saddr; | |
3158 | ||
3159 | nexthdr = ip6->nexthdr; | |
3160 | offset += sizeof(_ipv6h); | |
3161 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3162 | if (offset < 0) | |
3163 | return -EINVAL; | |
3164 | ||
3165 | proto = nexthdr; | |
3166 | switch (proto) { | |
3167 | case IPPROTO_TCP: | |
3168 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3169 | if (th != NULL) | |
3170 | sip->sin6_port = th->source; | |
3171 | break; | |
3172 | case IPPROTO_UDP: | |
3173 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3174 | if (uh != NULL) | |
3175 | sip->sin6_port = uh->source; | |
3176 | break; | |
3177 | case IPPROTO_DCCP: | |
3178 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3179 | if (dh != NULL) | |
3180 | sip->sin6_port = dh->dccph_sport; | |
3181 | break; | |
3182 | } | |
3183 | return proto; | |
3184 | } | |
3185 | ||
e114e473 CS |
3186 | /** |
3187 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3188 | * @sk: socket | |
3189 | * @skb: packet | |
3190 | * | |
3191 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3192 | */ | |
3193 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3194 | { | |
3195 | struct netlbl_lsm_secattr secattr; | |
3196 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3197 | struct smack_known *skp; |
6ea06247 | 3198 | struct sockaddr_in6 sadd; |
c6739443 | 3199 | int rc = 0; |
ecfcc53f | 3200 | struct smk_audit_info ad; |
923e9a13 | 3201 | #ifdef CONFIG_AUDIT |
48c62af6 | 3202 | struct lsm_network_audit net; |
923e9a13 | 3203 | #endif |
c6739443 CS |
3204 | switch (sk->sk_family) { |
3205 | case PF_INET: | |
3206 | /* | |
3207 | * Translate what netlabel gave us. | |
3208 | */ | |
3209 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3210 | |
c6739443 CS |
3211 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3212 | if (rc == 0) | |
2f823ff8 | 3213 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3214 | else |
2f823ff8 | 3215 | skp = smack_net_ambient; |
6d3dc07c | 3216 | |
c6739443 | 3217 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3218 | |
ecfcc53f | 3219 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3220 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3221 | ad.a.u.net->family = sk->sk_family; | |
3222 | ad.a.u.net->netif = skb->skb_iif; | |
3223 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3224 | #endif |
c6739443 CS |
3225 | /* |
3226 | * Receiving a packet requires that the other end | |
3227 | * be able to write here. Read access is not required. | |
3228 | * This is the simplist possible security model | |
3229 | * for networking. | |
3230 | */ | |
2f823ff8 | 3231 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
c6739443 CS |
3232 | if (rc != 0) |
3233 | netlbl_skbuff_err(skb, rc, 0); | |
3234 | break; | |
3235 | case PF_INET6: | |
3236 | rc = smk_skb_to_addr_ipv6(skb, &sadd); | |
3237 | if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) | |
3238 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3239 | else | |
3240 | rc = 0; | |
3241 | break; | |
3242 | } | |
a8134296 | 3243 | return rc; |
e114e473 CS |
3244 | } |
3245 | ||
3246 | /** | |
3247 | * smack_socket_getpeersec_stream - pull in packet label | |
3248 | * @sock: the socket | |
3249 | * @optval: user's destination | |
3250 | * @optlen: size thereof | |
251a2a95 | 3251 | * @len: max thereof |
e114e473 CS |
3252 | * |
3253 | * returns zero on success, an error code otherwise | |
3254 | */ | |
3255 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3256 | char __user *optval, | |
3257 | int __user *optlen, unsigned len) | |
3258 | { | |
3259 | struct socket_smack *ssp; | |
272cd7a8 CS |
3260 | char *rcp = ""; |
3261 | int slen = 1; | |
e114e473 CS |
3262 | int rc = 0; |
3263 | ||
3264 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3265 | if (ssp->smk_packet != NULL) { |
3266 | rcp = ssp->smk_packet; | |
3267 | slen = strlen(rcp) + 1; | |
3268 | } | |
e114e473 CS |
3269 | |
3270 | if (slen > len) | |
3271 | rc = -ERANGE; | |
272cd7a8 | 3272 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3273 | rc = -EFAULT; |
3274 | ||
3275 | if (put_user(slen, optlen) != 0) | |
3276 | rc = -EFAULT; | |
3277 | ||
3278 | return rc; | |
3279 | } | |
3280 | ||
3281 | ||
3282 | /** | |
3283 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3284 | * @sock: the peer socket |
e114e473 CS |
3285 | * @skb: packet data |
3286 | * @secid: pointer to where to put the secid of the packet | |
3287 | * | |
3288 | * Sets the netlabel socket state on sk from parent | |
3289 | */ | |
3290 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3291 | struct sk_buff *skb, u32 *secid) | |
3292 | ||
3293 | { | |
3294 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3295 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3296 | struct smack_known *skp; |
b4e0d5f0 CS |
3297 | int family = PF_UNSPEC; |
3298 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3299 | int rc; |
3300 | ||
b4e0d5f0 CS |
3301 | if (skb != NULL) { |
3302 | if (skb->protocol == htons(ETH_P_IP)) | |
3303 | family = PF_INET; | |
3304 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3305 | family = PF_INET6; | |
e114e473 | 3306 | } |
b4e0d5f0 CS |
3307 | if (family == PF_UNSPEC && sock != NULL) |
3308 | family = sock->sk->sk_family; | |
e114e473 | 3309 | |
b4e0d5f0 | 3310 | if (family == PF_UNIX) { |
272cd7a8 | 3311 | ssp = sock->sk->sk_security; |
2f823ff8 | 3312 | s = ssp->smk_out->smk_secid; |
b4e0d5f0 CS |
3313 | } else if (family == PF_INET || family == PF_INET6) { |
3314 | /* | |
3315 | * Translate what netlabel gave us. | |
3316 | */ | |
272cd7a8 CS |
3317 | if (sock != NULL && sock->sk != NULL) |
3318 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3319 | netlbl_secattr_init(&secattr); |
3320 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3321 | if (rc == 0) { | |
2f823ff8 CS |
3322 | skp = smack_from_secattr(&secattr, ssp); |
3323 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3324 | } |
3325 | netlbl_secattr_destroy(&secattr); | |
3326 | } | |
3327 | *secid = s; | |
e114e473 CS |
3328 | if (s == 0) |
3329 | return -EINVAL; | |
e114e473 CS |
3330 | return 0; |
3331 | } | |
3332 | ||
3333 | /** | |
07feee8f PM |
3334 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3335 | * @sk: child sock | |
3336 | * @parent: parent socket | |
e114e473 | 3337 | * |
07feee8f PM |
3338 | * Set the smk_{in,out} state of an existing sock based on the process that |
3339 | * is creating the new socket. | |
e114e473 CS |
3340 | */ |
3341 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3342 | { | |
3343 | struct socket_smack *ssp; | |
2f823ff8 | 3344 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3345 | |
07feee8f PM |
3346 | if (sk == NULL || |
3347 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3348 | return; |
3349 | ||
3350 | ssp = sk->sk_security; | |
2f823ff8 CS |
3351 | ssp->smk_in = skp->smk_known; |
3352 | ssp->smk_out = skp; | |
07feee8f | 3353 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3354 | } |
3355 | ||
3356 | /** | |
3357 | * smack_inet_conn_request - Smack access check on connect | |
3358 | * @sk: socket involved | |
3359 | * @skb: packet | |
3360 | * @req: unused | |
3361 | * | |
3362 | * Returns 0 if a task with the packet label could write to | |
3363 | * the socket, otherwise an error code | |
3364 | */ | |
3365 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3366 | struct request_sock *req) | |
3367 | { | |
07feee8f | 3368 | u16 family = sk->sk_family; |
f7112e6c | 3369 | struct smack_known *skp; |
e114e473 | 3370 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3371 | struct netlbl_lsm_secattr secattr; |
3372 | struct sockaddr_in addr; | |
3373 | struct iphdr *hdr; | |
f7112e6c | 3374 | char *hsp; |
e114e473 | 3375 | int rc; |
ecfcc53f | 3376 | struct smk_audit_info ad; |
923e9a13 | 3377 | #ifdef CONFIG_AUDIT |
48c62af6 | 3378 | struct lsm_network_audit net; |
923e9a13 | 3379 | #endif |
e114e473 | 3380 | |
c6739443 CS |
3381 | if (family == PF_INET6) { |
3382 | /* | |
3383 | * Handle mapped IPv4 packets arriving | |
3384 | * via IPv6 sockets. Don't set up netlabel | |
3385 | * processing on IPv6. | |
3386 | */ | |
3387 | if (skb->protocol == htons(ETH_P_IP)) | |
3388 | family = PF_INET; | |
3389 | else | |
3390 | return 0; | |
3391 | } | |
e114e473 | 3392 | |
07feee8f PM |
3393 | netlbl_secattr_init(&secattr); |
3394 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3395 | if (rc == 0) |
2f823ff8 | 3396 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3397 | else |
2f823ff8 | 3398 | skp = &smack_known_huh; |
07feee8f PM |
3399 | netlbl_secattr_destroy(&secattr); |
3400 | ||
ecfcc53f | 3401 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3402 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3403 | ad.a.u.net->family = family; | |
3404 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3405 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3406 | #endif | |
e114e473 | 3407 | /* |
07feee8f PM |
3408 | * Receiving a packet requires that the other end be able to write |
3409 | * here. Read access is not required. | |
e114e473 | 3410 | */ |
2f823ff8 | 3411 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3412 | if (rc != 0) |
3413 | return rc; | |
3414 | ||
3415 | /* | |
3416 | * Save the peer's label in the request_sock so we can later setup | |
3417 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3418 | */ | |
2f823ff8 | 3419 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3420 | |
3421 | /* | |
3422 | * We need to decide if we want to label the incoming connection here | |
3423 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3424 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3425 | */ |
3426 | hdr = ip_hdr(skb); | |
3427 | addr.sin_addr.s_addr = hdr->saddr; | |
3428 | rcu_read_lock(); | |
f7112e6c CS |
3429 | hsp = smack_host_label(&addr); |
3430 | rcu_read_unlock(); | |
3431 | ||
2f823ff8 | 3432 | if (hsp == NULL) |
f7112e6c | 3433 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3434 | else |
07feee8f | 3435 | netlbl_req_delattr(req); |
e114e473 CS |
3436 | |
3437 | return rc; | |
3438 | } | |
3439 | ||
07feee8f PM |
3440 | /** |
3441 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3442 | * @sk: the new socket | |
3443 | * @req: the connection's request_sock | |
3444 | * | |
3445 | * Transfer the connection's peer label to the newly created socket. | |
3446 | */ | |
3447 | static void smack_inet_csk_clone(struct sock *sk, | |
3448 | const struct request_sock *req) | |
3449 | { | |
3450 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3451 | struct smack_known *skp; |
07feee8f | 3452 | |
2f823ff8 CS |
3453 | if (req->peer_secid != 0) { |
3454 | skp = smack_from_secid(req->peer_secid); | |
3455 | ssp->smk_packet = skp->smk_known; | |
3456 | } else | |
272cd7a8 | 3457 | ssp->smk_packet = NULL; |
07feee8f PM |
3458 | } |
3459 | ||
e114e473 CS |
3460 | /* |
3461 | * Key management security hooks | |
3462 | * | |
3463 | * Casey has not tested key support very heavily. | |
3464 | * The permission check is most likely too restrictive. | |
3465 | * If you care about keys please have a look. | |
3466 | */ | |
3467 | #ifdef CONFIG_KEYS | |
3468 | ||
3469 | /** | |
3470 | * smack_key_alloc - Set the key security blob | |
3471 | * @key: object | |
d84f4f99 | 3472 | * @cred: the credentials to use |
e114e473 CS |
3473 | * @flags: unused |
3474 | * | |
3475 | * No allocation required | |
3476 | * | |
3477 | * Returns 0 | |
3478 | */ | |
d84f4f99 | 3479 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3480 | unsigned long flags) |
3481 | { | |
2f823ff8 CS |
3482 | struct smack_known *skp = smk_of_task(cred->security); |
3483 | ||
3484 | key->security = skp->smk_known; | |
e114e473 CS |
3485 | return 0; |
3486 | } | |
3487 | ||
3488 | /** | |
3489 | * smack_key_free - Clear the key security blob | |
3490 | * @key: the object | |
3491 | * | |
3492 | * Clear the blob pointer | |
3493 | */ | |
3494 | static void smack_key_free(struct key *key) | |
3495 | { | |
3496 | key->security = NULL; | |
3497 | } | |
3498 | ||
3499 | /* | |
3500 | * smack_key_permission - Smack access on a key | |
3501 | * @key_ref: gets to the object | |
d84f4f99 | 3502 | * @cred: the credentials to use |
e114e473 CS |
3503 | * @perm: unused |
3504 | * | |
3505 | * Return 0 if the task has read and write to the object, | |
3506 | * an error code otherwise | |
3507 | */ | |
3508 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3509 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3510 | { |
3511 | struct key *keyp; | |
ecfcc53f | 3512 | struct smk_audit_info ad; |
2f823ff8 | 3513 | struct smack_known *tkp = smk_of_task(cred->security); |
e114e473 CS |
3514 | |
3515 | keyp = key_ref_to_ptr(key_ref); | |
3516 | if (keyp == NULL) | |
3517 | return -EINVAL; | |
3518 | /* | |
3519 | * If the key hasn't been initialized give it access so that | |
3520 | * it may do so. | |
3521 | */ | |
3522 | if (keyp->security == NULL) | |
3523 | return 0; | |
3524 | /* | |
3525 | * This should not occur | |
3526 | */ | |
2f823ff8 | 3527 | if (tkp == NULL) |
e114e473 | 3528 | return -EACCES; |
ecfcc53f EB |
3529 | #ifdef CONFIG_AUDIT |
3530 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3531 | ad.a.u.key_struct.key = keyp->serial; | |
3532 | ad.a.u.key_struct.key_desc = keyp->description; | |
3533 | #endif | |
2f823ff8 | 3534 | return smk_access(tkp, keyp->security, MAY_READWRITE, &ad); |
e114e473 CS |
3535 | } |
3536 | #endif /* CONFIG_KEYS */ | |
3537 | ||
d20bdda6 AD |
3538 | /* |
3539 | * Smack Audit hooks | |
3540 | * | |
3541 | * Audit requires a unique representation of each Smack specific | |
3542 | * rule. This unique representation is used to distinguish the | |
3543 | * object to be audited from remaining kernel objects and also | |
3544 | * works as a glue between the audit hooks. | |
3545 | * | |
3546 | * Since repository entries are added but never deleted, we'll use | |
3547 | * the smack_known label address related to the given audit rule as | |
3548 | * the needed unique representation. This also better fits the smack | |
3549 | * model where nearly everything is a label. | |
3550 | */ | |
3551 | #ifdef CONFIG_AUDIT | |
3552 | ||
3553 | /** | |
3554 | * smack_audit_rule_init - Initialize a smack audit rule | |
3555 | * @field: audit rule fields given from user-space (audit.h) | |
3556 | * @op: required testing operator (=, !=, >, <, ...) | |
3557 | * @rulestr: smack label to be audited | |
3558 | * @vrule: pointer to save our own audit rule representation | |
3559 | * | |
3560 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3561 | * The label to be audited is created if necessay. | |
3562 | */ | |
3563 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3564 | { | |
3565 | char **rule = (char **)vrule; | |
3566 | *rule = NULL; | |
3567 | ||
3568 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3569 | return -EINVAL; | |
3570 | ||
5af75d8d | 3571 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3572 | return -EINVAL; |
3573 | ||
3574 | *rule = smk_import(rulestr, 0); | |
3575 | ||
3576 | return 0; | |
3577 | } | |
3578 | ||
3579 | /** | |
3580 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3581 | * @krule: rule of interest, in Audit kernel representation format | |
3582 | * | |
3583 | * This is used to filter Smack rules from remaining Audit ones. | |
3584 | * If it's proved that this rule belongs to us, the | |
3585 | * audit_rule_match hook will be called to do the final judgement. | |
3586 | */ | |
3587 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3588 | { | |
3589 | struct audit_field *f; | |
3590 | int i; | |
3591 | ||
3592 | for (i = 0; i < krule->field_count; i++) { | |
3593 | f = &krule->fields[i]; | |
3594 | ||
3595 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3596 | return 1; | |
3597 | } | |
3598 | ||
3599 | return 0; | |
3600 | } | |
3601 | ||
3602 | /** | |
3603 | * smack_audit_rule_match - Audit given object ? | |
3604 | * @secid: security id for identifying the object to test | |
3605 | * @field: audit rule flags given from user-space | |
3606 | * @op: required testing operator | |
3607 | * @vrule: smack internal rule presentation | |
3608 | * @actx: audit context associated with the check | |
3609 | * | |
3610 | * The core Audit hook. It's used to take the decision of | |
3611 | * whether to audit or not to audit a given object. | |
3612 | */ | |
3613 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3614 | struct audit_context *actx) | |
3615 | { | |
2f823ff8 | 3616 | struct smack_known *skp; |
d20bdda6 AD |
3617 | char *rule = vrule; |
3618 | ||
4eb0f4ab RGB |
3619 | if (unlikely(!rule)) { |
3620 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
3621 | return -ENOENT; |
3622 | } | |
3623 | ||
3624 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3625 | return 0; | |
3626 | ||
2f823ff8 | 3627 | skp = smack_from_secid(secid); |
d20bdda6 AD |
3628 | |
3629 | /* | |
3630 | * No need to do string comparisons. If a match occurs, | |
3631 | * both pointers will point to the same smack_known | |
3632 | * label. | |
3633 | */ | |
5af75d8d | 3634 | if (op == Audit_equal) |
2f823ff8 | 3635 | return (rule == skp->smk_known); |
5af75d8d | 3636 | if (op == Audit_not_equal) |
2f823ff8 | 3637 | return (rule != skp->smk_known); |
d20bdda6 AD |
3638 | |
3639 | return 0; | |
3640 | } | |
3641 | ||
3642 | /** | |
3643 | * smack_audit_rule_free - free smack rule representation | |
3644 | * @vrule: rule to be freed. | |
3645 | * | |
3646 | * No memory was allocated. | |
3647 | */ | |
3648 | static void smack_audit_rule_free(void *vrule) | |
3649 | { | |
3650 | /* No-op */ | |
3651 | } | |
3652 | ||
3653 | #endif /* CONFIG_AUDIT */ | |
3654 | ||
746df9b5 DQ |
3655 | /** |
3656 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
3657 | * @name: Full xattr name to check. | |
3658 | */ | |
3659 | static int smack_ismaclabel(const char *name) | |
3660 | { | |
3661 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
3662 | } | |
3663 | ||
3664 | ||
251a2a95 | 3665 | /** |
e114e473 CS |
3666 | * smack_secid_to_secctx - return the smack label for a secid |
3667 | * @secid: incoming integer | |
3668 | * @secdata: destination | |
3669 | * @seclen: how long it is | |
3670 | * | |
3671 | * Exists for networking code. | |
3672 | */ | |
3673 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3674 | { | |
2f823ff8 | 3675 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 3676 | |
d5630b9d | 3677 | if (secdata) |
2f823ff8 CS |
3678 | *secdata = skp->smk_known; |
3679 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
3680 | return 0; |
3681 | } | |
3682 | ||
251a2a95 | 3683 | /** |
4bc87e62 CS |
3684 | * smack_secctx_to_secid - return the secid for a smack label |
3685 | * @secdata: smack label | |
3686 | * @seclen: how long result is | |
3687 | * @secid: outgoing integer | |
3688 | * | |
3689 | * Exists for audit and networking code. | |
3690 | */ | |
e52c1764 | 3691 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3692 | { |
3693 | *secid = smack_to_secid(secdata); | |
3694 | return 0; | |
3695 | } | |
3696 | ||
251a2a95 | 3697 | /** |
e114e473 | 3698 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3699 | * @secdata: unused |
3700 | * @seclen: unused | |
e114e473 CS |
3701 | * |
3702 | * Exists to make sure nothing gets done, and properly | |
3703 | */ | |
3704 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3705 | { | |
3706 | } | |
3707 | ||
1ee65e37 DQ |
3708 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3709 | { | |
3710 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3711 | } | |
3712 | ||
3713 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3714 | { | |
3715 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3716 | } | |
3717 | ||
3718 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3719 | { | |
3720 | int len = 0; | |
3721 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3722 | ||
3723 | if (len < 0) | |
3724 | return len; | |
3725 | *ctxlen = len; | |
3726 | return 0; | |
3727 | } | |
3728 | ||
076c54c5 AD |
3729 | struct security_operations smack_ops = { |
3730 | .name = "smack", | |
3731 | ||
9e48858f | 3732 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3733 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3734 | .syslog = smack_syslog, |
e114e473 CS |
3735 | |
3736 | .sb_alloc_security = smack_sb_alloc_security, | |
3737 | .sb_free_security = smack_sb_free_security, | |
3738 | .sb_copy_data = smack_sb_copy_data, | |
3739 | .sb_kern_mount = smack_sb_kern_mount, | |
3740 | .sb_statfs = smack_sb_statfs, | |
e114e473 | 3741 | |
676dac4b | 3742 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3743 | .bprm_committing_creds = smack_bprm_committing_creds, |
3744 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3745 | |
e114e473 CS |
3746 | .inode_alloc_security = smack_inode_alloc_security, |
3747 | .inode_free_security = smack_inode_free_security, | |
3748 | .inode_init_security = smack_inode_init_security, | |
3749 | .inode_link = smack_inode_link, | |
3750 | .inode_unlink = smack_inode_unlink, | |
3751 | .inode_rmdir = smack_inode_rmdir, | |
3752 | .inode_rename = smack_inode_rename, | |
3753 | .inode_permission = smack_inode_permission, | |
3754 | .inode_setattr = smack_inode_setattr, | |
3755 | .inode_getattr = smack_inode_getattr, | |
3756 | .inode_setxattr = smack_inode_setxattr, | |
3757 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3758 | .inode_getxattr = smack_inode_getxattr, | |
3759 | .inode_removexattr = smack_inode_removexattr, | |
3760 | .inode_getsecurity = smack_inode_getsecurity, | |
3761 | .inode_setsecurity = smack_inode_setsecurity, | |
3762 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3763 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3764 | |
3765 | .file_permission = smack_file_permission, | |
3766 | .file_alloc_security = smack_file_alloc_security, | |
3767 | .file_free_security = smack_file_free_security, | |
3768 | .file_ioctl = smack_file_ioctl, | |
3769 | .file_lock = smack_file_lock, | |
3770 | .file_fcntl = smack_file_fcntl, | |
e5467859 AV |
3771 | .mmap_file = smack_mmap_file, |
3772 | .mmap_addr = cap_mmap_addr, | |
e114e473 CS |
3773 | .file_set_fowner = smack_file_set_fowner, |
3774 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3775 | .file_receive = smack_file_receive, | |
3776 | ||
83d49856 | 3777 | .file_open = smack_file_open, |
531f1d45 | 3778 | |
ee18d64c | 3779 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3780 | .cred_free = smack_cred_free, |
d84f4f99 | 3781 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3782 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3783 | .kernel_act_as = smack_kernel_act_as, |
3784 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3785 | .task_setpgid = smack_task_setpgid, |
3786 | .task_getpgid = smack_task_getpgid, | |
3787 | .task_getsid = smack_task_getsid, | |
3788 | .task_getsecid = smack_task_getsecid, | |
3789 | .task_setnice = smack_task_setnice, | |
3790 | .task_setioprio = smack_task_setioprio, | |
3791 | .task_getioprio = smack_task_getioprio, | |
3792 | .task_setscheduler = smack_task_setscheduler, | |
3793 | .task_getscheduler = smack_task_getscheduler, | |
3794 | .task_movememory = smack_task_movememory, | |
3795 | .task_kill = smack_task_kill, | |
3796 | .task_wait = smack_task_wait, | |
e114e473 CS |
3797 | .task_to_inode = smack_task_to_inode, |
3798 | ||
3799 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3800 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3801 | |
3802 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3803 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3804 | ||
3805 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3806 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3807 | .msg_queue_associate = smack_msg_queue_associate, | |
3808 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3809 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3810 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3811 | ||
3812 | .shm_alloc_security = smack_shm_alloc_security, | |
3813 | .shm_free_security = smack_shm_free_security, | |
3814 | .shm_associate = smack_shm_associate, | |
3815 | .shm_shmctl = smack_shm_shmctl, | |
3816 | .shm_shmat = smack_shm_shmat, | |
3817 | ||
3818 | .sem_alloc_security = smack_sem_alloc_security, | |
3819 | .sem_free_security = smack_sem_free_security, | |
3820 | .sem_associate = smack_sem_associate, | |
3821 | .sem_semctl = smack_sem_semctl, | |
3822 | .sem_semop = smack_sem_semop, | |
3823 | ||
e114e473 CS |
3824 | .d_instantiate = smack_d_instantiate, |
3825 | ||
3826 | .getprocattr = smack_getprocattr, | |
3827 | .setprocattr = smack_setprocattr, | |
3828 | ||
3829 | .unix_stream_connect = smack_unix_stream_connect, | |
3830 | .unix_may_send = smack_unix_may_send, | |
3831 | ||
3832 | .socket_post_create = smack_socket_post_create, | |
c6739443 | 3833 | .socket_bind = smack_socket_bind, |
6d3dc07c CS |
3834 | .socket_connect = smack_socket_connect, |
3835 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3836 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3837 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3838 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3839 | .sk_alloc_security = smack_sk_alloc_security, | |
3840 | .sk_free_security = smack_sk_free_security, | |
3841 | .sock_graft = smack_sock_graft, | |
3842 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3843 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3844 | |
e114e473 CS |
3845 | /* key management security hooks */ |
3846 | #ifdef CONFIG_KEYS | |
3847 | .key_alloc = smack_key_alloc, | |
3848 | .key_free = smack_key_free, | |
3849 | .key_permission = smack_key_permission, | |
3850 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3851 | |
3852 | /* Audit hooks */ | |
3853 | #ifdef CONFIG_AUDIT | |
3854 | .audit_rule_init = smack_audit_rule_init, | |
3855 | .audit_rule_known = smack_audit_rule_known, | |
3856 | .audit_rule_match = smack_audit_rule_match, | |
3857 | .audit_rule_free = smack_audit_rule_free, | |
3858 | #endif /* CONFIG_AUDIT */ | |
3859 | ||
746df9b5 | 3860 | .ismaclabel = smack_ismaclabel, |
e114e473 | 3861 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3862 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3863 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3864 | .inode_notifysecctx = smack_inode_notifysecctx, |
3865 | .inode_setsecctx = smack_inode_setsecctx, | |
3866 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3867 | }; |
3868 | ||
7198e2ee | 3869 | |
86812bb0 | 3870 | static __init void init_smack_known_list(void) |
7198e2ee | 3871 | { |
86812bb0 CS |
3872 | /* |
3873 | * Initialize rule list locks | |
3874 | */ | |
3875 | mutex_init(&smack_known_huh.smk_rules_lock); | |
3876 | mutex_init(&smack_known_hat.smk_rules_lock); | |
3877 | mutex_init(&smack_known_floor.smk_rules_lock); | |
3878 | mutex_init(&smack_known_star.smk_rules_lock); | |
3879 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
3880 | mutex_init(&smack_known_web.smk_rules_lock); | |
3881 | /* | |
3882 | * Initialize rule lists | |
3883 | */ | |
3884 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
3885 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
3886 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
3887 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
3888 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
3889 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
3890 | /* | |
3891 | * Create the known labels list | |
3892 | */ | |
4d7cf4a1 TS |
3893 | smk_insert_entry(&smack_known_huh); |
3894 | smk_insert_entry(&smack_known_hat); | |
3895 | smk_insert_entry(&smack_known_star); | |
3896 | smk_insert_entry(&smack_known_floor); | |
3897 | smk_insert_entry(&smack_known_invalid); | |
3898 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
3899 | } |
3900 | ||
e114e473 CS |
3901 | /** |
3902 | * smack_init - initialize the smack system | |
3903 | * | |
3904 | * Returns 0 | |
3905 | */ | |
3906 | static __init int smack_init(void) | |
3907 | { | |
d84f4f99 | 3908 | struct cred *cred; |
676dac4b | 3909 | struct task_smack *tsp; |
d84f4f99 | 3910 | |
7898e1f8 CS |
3911 | if (!security_module_enable(&smack_ops)) |
3912 | return 0; | |
3913 | ||
2f823ff8 CS |
3914 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
3915 | GFP_KERNEL); | |
676dac4b CS |
3916 | if (tsp == NULL) |
3917 | return -ENOMEM; | |
3918 | ||
e114e473 CS |
3919 | printk(KERN_INFO "Smack: Initializing.\n"); |
3920 | ||
3921 | /* | |
3922 | * Set the security state for the initial task. | |
3923 | */ | |
d84f4f99 | 3924 | cred = (struct cred *) current->cred; |
676dac4b | 3925 | cred->security = tsp; |
e114e473 | 3926 | |
86812bb0 CS |
3927 | /* initialize the smack_known_list */ |
3928 | init_smack_known_list(); | |
e114e473 CS |
3929 | |
3930 | /* | |
3931 | * Register with LSM | |
3932 | */ | |
3933 | if (register_security(&smack_ops)) | |
3934 | panic("smack: Unable to register with kernel.\n"); | |
3935 | ||
3936 | return 0; | |
3937 | } | |
3938 | ||
3939 | /* | |
3940 | * Smack requires early initialization in order to label | |
3941 | * all processes and objects when they are created. | |
3942 | */ | |
3943 | security_initcall(smack_init); |