Commit | Line | Data |
---|---|---|
e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
5c6d1125 | 8 | * Jarkko Sakkinen <ext-jarkko.2.sakkinen@nokia.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 |
e114e473 CS |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License version 2, | |
17 | * as published by the Free Software Foundation. | |
18 | */ | |
19 | ||
20 | #include <linux/xattr.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/mount.h> | |
23 | #include <linux/stat.h> | |
e114e473 CS |
24 | #include <linux/kd.h> |
25 | #include <asm/ioctls.h> | |
07feee8f | 26 | #include <linux/ip.h> |
e114e473 CS |
27 | #include <linux/tcp.h> |
28 | #include <linux/udp.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
e114e473 CS |
30 | #include <linux/mutex.h> |
31 | #include <linux/pipe_fs_i.h> | |
32 | #include <net/netlabel.h> | |
33 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 34 | #include <linux/audit.h> |
1fd7317d | 35 | #include <linux/magic.h> |
2a7dba39 | 36 | #include <linux/dcache.h> |
e114e473 CS |
37 | #include "smack.h" |
38 | ||
c69e8d9c DH |
39 | #define task_security(task) (task_cred_xxx((task), security)) |
40 | ||
5c6d1125 JS |
41 | #define TRANS_TRUE "TRUE" |
42 | #define TRANS_TRUE_SIZE 4 | |
43 | ||
e114e473 CS |
44 | /** |
45 | * smk_fetch - Fetch the smack label from a file. | |
46 | * @ip: a pointer to the inode | |
47 | * @dp: a pointer to the dentry | |
48 | * | |
49 | * Returns a pointer to the master list entry for the Smack label | |
50 | * or NULL if there was no label to fetch. | |
51 | */ | |
676dac4b | 52 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
53 | { |
54 | int rc; | |
55 | char in[SMK_LABELLEN]; | |
56 | ||
57 | if (ip->i_op->getxattr == NULL) | |
58 | return NULL; | |
59 | ||
676dac4b | 60 | rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); |
e114e473 CS |
61 | if (rc < 0) |
62 | return NULL; | |
63 | ||
64 | return smk_import(in, rc); | |
65 | } | |
66 | ||
67 | /** | |
68 | * new_inode_smack - allocate an inode security blob | |
69 | * @smack: a pointer to the Smack label to use in the blob | |
70 | * | |
71 | * Returns the new blob or NULL if there's no memory available | |
72 | */ | |
73 | struct inode_smack *new_inode_smack(char *smack) | |
74 | { | |
75 | struct inode_smack *isp; | |
76 | ||
77 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
78 | if (isp == NULL) | |
79 | return NULL; | |
80 | ||
81 | isp->smk_inode = smack; | |
82 | isp->smk_flags = 0; | |
83 | mutex_init(&isp->smk_lock); | |
84 | ||
85 | return isp; | |
86 | } | |
87 | ||
7898e1f8 CS |
88 | /** |
89 | * new_task_smack - allocate a task 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 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
95 | { | |
96 | struct task_smack *tsp; | |
97 | ||
98 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
99 | if (tsp == NULL) | |
100 | return NULL; | |
101 | ||
102 | tsp->smk_task = task; | |
103 | tsp->smk_forked = forked; | |
104 | INIT_LIST_HEAD(&tsp->smk_rules); | |
105 | mutex_init(&tsp->smk_rules_lock); | |
106 | ||
107 | return tsp; | |
108 | } | |
109 | ||
110 | /** | |
111 | * smk_copy_rules - copy a rule set | |
112 | * @nhead - new rules header pointer | |
113 | * @ohead - old rules header pointer | |
114 | * | |
115 | * Returns 0 on success, -ENOMEM on error | |
116 | */ | |
117 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
118 | gfp_t gfp) | |
119 | { | |
120 | struct smack_rule *nrp; | |
121 | struct smack_rule *orp; | |
122 | int rc = 0; | |
123 | ||
124 | INIT_LIST_HEAD(nhead); | |
125 | ||
126 | list_for_each_entry_rcu(orp, ohead, list) { | |
127 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
128 | if (nrp == NULL) { | |
129 | rc = -ENOMEM; | |
130 | break; | |
131 | } | |
132 | *nrp = *orp; | |
133 | list_add_rcu(&nrp->list, nhead); | |
134 | } | |
135 | return rc; | |
136 | } | |
137 | ||
e114e473 CS |
138 | /* |
139 | * LSM hooks. | |
140 | * We he, that is fun! | |
141 | */ | |
142 | ||
143 | /** | |
9e48858f | 144 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 145 | * @ctp: child task pointer |
251a2a95 | 146 | * @mode: ptrace attachment mode |
e114e473 CS |
147 | * |
148 | * Returns 0 if access is OK, an error code otherwise | |
149 | * | |
150 | * Do the capability checks, and require read and write. | |
151 | */ | |
9e48858f | 152 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
153 | { |
154 | int rc; | |
ecfcc53f | 155 | struct smk_audit_info ad; |
7898e1f8 | 156 | char *tsp; |
e114e473 | 157 | |
9e48858f | 158 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
159 | if (rc != 0) |
160 | return rc; | |
161 | ||
676dac4b | 162 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
163 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
164 | smk_ad_setfield_u_tsk(&ad, ctp); | |
165 | ||
7898e1f8 | 166 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
167 | return rc; |
168 | } | |
169 | ||
170 | /** | |
171 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
172 | * @ptp: parent task pointer | |
173 | * | |
174 | * Returns 0 if access is OK, an error code otherwise | |
175 | * | |
176 | * Do the capability checks, and require read and write. | |
177 | */ | |
178 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
179 | { | |
180 | int rc; | |
ecfcc53f | 181 | struct smk_audit_info ad; |
7898e1f8 | 182 | char *tsp; |
5cd9c58f DH |
183 | |
184 | rc = cap_ptrace_traceme(ptp); | |
185 | if (rc != 0) | |
186 | return rc; | |
e114e473 | 187 | |
7898e1f8 | 188 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
189 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
190 | smk_ad_setfield_u_tsk(&ad, ptp); | |
191 | ||
7898e1f8 | 192 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
193 | return rc; |
194 | } | |
195 | ||
196 | /** | |
197 | * smack_syslog - Smack approval on syslog | |
198 | * @type: message type | |
199 | * | |
200 | * Require that the task has the floor label | |
201 | * | |
202 | * Returns 0 on success, error code otherwise. | |
203 | */ | |
12b3052c | 204 | static int smack_syslog(int typefrom_file) |
e114e473 | 205 | { |
12b3052c | 206 | int rc = 0; |
676dac4b | 207 | char *sp = smk_of_current(); |
e114e473 | 208 | |
e114e473 CS |
209 | if (capable(CAP_MAC_OVERRIDE)) |
210 | return 0; | |
211 | ||
212 | if (sp != smack_known_floor.smk_known) | |
213 | rc = -EACCES; | |
214 | ||
215 | return rc; | |
216 | } | |
217 | ||
218 | ||
219 | /* | |
220 | * Superblock Hooks. | |
221 | */ | |
222 | ||
223 | /** | |
224 | * smack_sb_alloc_security - allocate a superblock blob | |
225 | * @sb: the superblock getting the blob | |
226 | * | |
227 | * Returns 0 on success or -ENOMEM on error. | |
228 | */ | |
229 | static int smack_sb_alloc_security(struct super_block *sb) | |
230 | { | |
231 | struct superblock_smack *sbsp; | |
232 | ||
233 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
234 | ||
235 | if (sbsp == NULL) | |
236 | return -ENOMEM; | |
237 | ||
238 | sbsp->smk_root = smack_known_floor.smk_known; | |
239 | sbsp->smk_default = smack_known_floor.smk_known; | |
240 | sbsp->smk_floor = smack_known_floor.smk_known; | |
241 | sbsp->smk_hat = smack_known_hat.smk_known; | |
242 | sbsp->smk_initialized = 0; | |
243 | spin_lock_init(&sbsp->smk_sblock); | |
244 | ||
245 | sb->s_security = sbsp; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | /** | |
251 | * smack_sb_free_security - free a superblock blob | |
252 | * @sb: the superblock getting the blob | |
253 | * | |
254 | */ | |
255 | static void smack_sb_free_security(struct super_block *sb) | |
256 | { | |
257 | kfree(sb->s_security); | |
258 | sb->s_security = NULL; | |
259 | } | |
260 | ||
261 | /** | |
262 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 263 | * @orig: where to start |
251a2a95 | 264 | * @smackopts: mount options string |
e114e473 CS |
265 | * |
266 | * Returns 0 on success or -ENOMEM on error. | |
267 | * | |
268 | * Copy the Smack specific mount options out of the mount | |
269 | * options list. | |
270 | */ | |
e0007529 | 271 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
272 | { |
273 | char *cp, *commap, *otheropts, *dp; | |
274 | ||
e114e473 CS |
275 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
276 | if (otheropts == NULL) | |
277 | return -ENOMEM; | |
278 | ||
279 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
280 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
281 | dp = smackopts; | |
282 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
283 | dp = smackopts; | |
284 | else if (strstr(cp, SMK_FSHAT) == cp) | |
285 | dp = smackopts; | |
286 | else if (strstr(cp, SMK_FSROOT) == cp) | |
287 | dp = smackopts; | |
288 | else | |
289 | dp = otheropts; | |
290 | ||
291 | commap = strchr(cp, ','); | |
292 | if (commap != NULL) | |
293 | *commap = '\0'; | |
294 | ||
295 | if (*dp != '\0') | |
296 | strcat(dp, ","); | |
297 | strcat(dp, cp); | |
298 | } | |
299 | ||
300 | strcpy(orig, otheropts); | |
301 | free_page((unsigned long)otheropts); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | /** | |
307 | * smack_sb_kern_mount - Smack specific mount processing | |
308 | * @sb: the file system superblock | |
12204e24 | 309 | * @flags: the mount flags |
e114e473 CS |
310 | * @data: the smack mount options |
311 | * | |
312 | * Returns 0 on success, an error code on failure | |
313 | */ | |
12204e24 | 314 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
315 | { |
316 | struct dentry *root = sb->s_root; | |
317 | struct inode *inode = root->d_inode; | |
318 | struct superblock_smack *sp = sb->s_security; | |
319 | struct inode_smack *isp; | |
320 | char *op; | |
321 | char *commap; | |
322 | char *nsp; | |
323 | ||
324 | spin_lock(&sp->smk_sblock); | |
325 | if (sp->smk_initialized != 0) { | |
326 | spin_unlock(&sp->smk_sblock); | |
327 | return 0; | |
328 | } | |
329 | sp->smk_initialized = 1; | |
330 | spin_unlock(&sp->smk_sblock); | |
331 | ||
332 | for (op = data; op != NULL; op = commap) { | |
333 | commap = strchr(op, ','); | |
334 | if (commap != NULL) | |
335 | *commap++ = '\0'; | |
336 | ||
337 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
338 | op += strlen(SMK_FSHAT); | |
339 | nsp = smk_import(op, 0); | |
340 | if (nsp != NULL) | |
341 | sp->smk_hat = nsp; | |
342 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
343 | op += strlen(SMK_FSFLOOR); | |
344 | nsp = smk_import(op, 0); | |
345 | if (nsp != NULL) | |
346 | sp->smk_floor = nsp; | |
347 | } else if (strncmp(op, SMK_FSDEFAULT, | |
348 | strlen(SMK_FSDEFAULT)) == 0) { | |
349 | op += strlen(SMK_FSDEFAULT); | |
350 | nsp = smk_import(op, 0); | |
351 | if (nsp != NULL) | |
352 | sp->smk_default = nsp; | |
353 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
354 | op += strlen(SMK_FSROOT); | |
355 | nsp = smk_import(op, 0); | |
356 | if (nsp != NULL) | |
357 | sp->smk_root = nsp; | |
358 | } | |
359 | } | |
360 | ||
361 | /* | |
362 | * Initialize the root inode. | |
363 | */ | |
364 | isp = inode->i_security; | |
365 | if (isp == NULL) | |
366 | inode->i_security = new_inode_smack(sp->smk_root); | |
367 | else | |
368 | isp->smk_inode = sp->smk_root; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | /** | |
374 | * smack_sb_statfs - Smack check on statfs | |
375 | * @dentry: identifies the file system in question | |
376 | * | |
377 | * Returns 0 if current can read the floor of the filesystem, | |
378 | * and error code otherwise | |
379 | */ | |
380 | static int smack_sb_statfs(struct dentry *dentry) | |
381 | { | |
382 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
383 | int rc; |
384 | struct smk_audit_info ad; | |
385 | ||
a269434d | 386 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 387 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 388 | |
ecfcc53f EB |
389 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
390 | return rc; | |
e114e473 CS |
391 | } |
392 | ||
393 | /** | |
394 | * smack_sb_mount - Smack check for mounting | |
395 | * @dev_name: unused | |
251a2a95 | 396 | * @path: mount point |
e114e473 CS |
397 | * @type: unused |
398 | * @flags: unused | |
399 | * @data: unused | |
400 | * | |
401 | * Returns 0 if current can write the floor of the filesystem | |
402 | * being mounted on, an error code otherwise. | |
403 | */ | |
b5266eb4 | 404 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
405 | char *type, unsigned long flags, void *data) |
406 | { | |
b5266eb4 | 407 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 408 | struct smk_audit_info ad; |
e114e473 | 409 | |
f48b7399 | 410 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f EB |
411 | smk_ad_setfield_u_fs_path(&ad, *path); |
412 | ||
413 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
414 | } |
415 | ||
416 | /** | |
417 | * smack_sb_umount - Smack check for unmounting | |
418 | * @mnt: file system to unmount | |
419 | * @flags: unused | |
420 | * | |
421 | * Returns 0 if current can write the floor of the filesystem | |
422 | * being unmounted, an error code otherwise. | |
423 | */ | |
424 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
425 | { | |
426 | struct superblock_smack *sbp; | |
ecfcc53f | 427 | struct smk_audit_info ad; |
a269434d | 428 | struct path path; |
e114e473 | 429 | |
a269434d EP |
430 | path.dentry = mnt->mnt_root; |
431 | path.mnt = mnt; | |
e114e473 | 432 | |
f48b7399 | 433 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 434 | smk_ad_setfield_u_fs_path(&ad, path); |
e114e473 | 435 | |
ecfcc53f EB |
436 | sbp = mnt->mnt_sb->s_security; |
437 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
438 | } |
439 | ||
676dac4b CS |
440 | /* |
441 | * BPRM hooks | |
442 | */ | |
443 | ||
ce8a4321 CS |
444 | /** |
445 | * smack_bprm_set_creds - set creds for exec | |
446 | * @bprm: the exec information | |
447 | * | |
448 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
449 | */ | |
676dac4b CS |
450 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
451 | { | |
452 | struct task_smack *tsp = bprm->cred->security; | |
453 | struct inode_smack *isp; | |
454 | struct dentry *dp; | |
455 | int rc; | |
456 | ||
457 | rc = cap_bprm_set_creds(bprm); | |
458 | if (rc != 0) | |
459 | return rc; | |
460 | ||
461 | if (bprm->cred_prepared) | |
462 | return 0; | |
463 | ||
464 | if (bprm->file == NULL || bprm->file->f_dentry == NULL) | |
465 | return 0; | |
466 | ||
467 | dp = bprm->file->f_dentry; | |
468 | ||
469 | if (dp->d_inode == NULL) | |
470 | return 0; | |
471 | ||
472 | isp = dp->d_inode->i_security; | |
473 | ||
474 | if (isp->smk_task != NULL) | |
475 | tsp->smk_task = isp->smk_task; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
e114e473 CS |
480 | /* |
481 | * Inode hooks | |
482 | */ | |
483 | ||
484 | /** | |
485 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 486 | * @inode: the inode in need of a blob |
e114e473 CS |
487 | * |
488 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
489 | */ | |
490 | static int smack_inode_alloc_security(struct inode *inode) | |
491 | { | |
676dac4b | 492 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
493 | if (inode->i_security == NULL) |
494 | return -ENOMEM; | |
495 | return 0; | |
496 | } | |
497 | ||
498 | /** | |
499 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 500 | * @inode: the inode with a blob |
e114e473 CS |
501 | * |
502 | * Clears the blob pointer in inode | |
503 | */ | |
504 | static void smack_inode_free_security(struct inode *inode) | |
505 | { | |
506 | kfree(inode->i_security); | |
507 | inode->i_security = NULL; | |
508 | } | |
509 | ||
510 | /** | |
511 | * smack_inode_init_security - copy out the smack from an inode | |
512 | * @inode: the inode | |
513 | * @dir: unused | |
2a7dba39 | 514 | * @qstr: unused |
e114e473 CS |
515 | * @name: where to put the attribute name |
516 | * @value: where to put the attribute value | |
517 | * @len: where to put the length of the attribute | |
518 | * | |
519 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
520 | */ | |
521 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
2a7dba39 EP |
522 | const struct qstr *qstr, char **name, |
523 | void **value, size_t *len) | |
e114e473 | 524 | { |
272cd7a8 CS |
525 | struct smack_known *skp; |
526 | char *csp = smk_of_current(); | |
e114e473 | 527 | char *isp = smk_of_inode(inode); |
5c6d1125 | 528 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 529 | int may; |
e114e473 CS |
530 | |
531 | if (name) { | |
532 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
533 | if (*name == NULL) | |
534 | return -ENOMEM; | |
535 | } | |
536 | ||
537 | if (value) { | |
272cd7a8 | 538 | skp = smk_find_entry(csp); |
7898e1f8 | 539 | rcu_read_lock(); |
272cd7a8 | 540 | may = smk_access_entry(csp, dsp, &skp->smk_rules); |
7898e1f8 | 541 | rcu_read_unlock(); |
5c6d1125 JS |
542 | |
543 | /* | |
544 | * If the access rule allows transmutation and | |
545 | * the directory requests transmutation then | |
546 | * by all means transmute. | |
547 | */ | |
7898e1f8 CS |
548 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
549 | smk_inode_transmutable(dir)) | |
5c6d1125 JS |
550 | isp = dsp; |
551 | ||
e114e473 CS |
552 | *value = kstrdup(isp, GFP_KERNEL); |
553 | if (*value == NULL) | |
554 | return -ENOMEM; | |
555 | } | |
556 | ||
557 | if (len) | |
558 | *len = strlen(isp) + 1; | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | /** | |
564 | * smack_inode_link - Smack check on link | |
565 | * @old_dentry: the existing object | |
566 | * @dir: unused | |
567 | * @new_dentry: the new object | |
568 | * | |
569 | * Returns 0 if access is permitted, an error code otherwise | |
570 | */ | |
571 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
572 | struct dentry *new_dentry) | |
573 | { | |
e114e473 | 574 | char *isp; |
ecfcc53f EB |
575 | struct smk_audit_info ad; |
576 | int rc; | |
577 | ||
a269434d | 578 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 579 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
580 | |
581 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 582 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
583 | |
584 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
585 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
586 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
587 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
588 | } |
589 | ||
590 | return rc; | |
591 | } | |
592 | ||
593 | /** | |
594 | * smack_inode_unlink - Smack check on inode deletion | |
595 | * @dir: containing directory object | |
596 | * @dentry: file to unlink | |
597 | * | |
598 | * Returns 0 if current can write the containing directory | |
599 | * and the object, error code otherwise | |
600 | */ | |
601 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
602 | { | |
603 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 604 | struct smk_audit_info ad; |
e114e473 CS |
605 | int rc; |
606 | ||
a269434d | 607 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
608 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
609 | ||
e114e473 CS |
610 | /* |
611 | * You need write access to the thing you're unlinking | |
612 | */ | |
ecfcc53f EB |
613 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
614 | if (rc == 0) { | |
e114e473 CS |
615 | /* |
616 | * You also need write access to the containing directory | |
617 | */ | |
ecfcc53f EB |
618 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
619 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
620 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
621 | } | |
e114e473 CS |
622 | return rc; |
623 | } | |
624 | ||
625 | /** | |
626 | * smack_inode_rmdir - Smack check on directory deletion | |
627 | * @dir: containing directory object | |
628 | * @dentry: directory to unlink | |
629 | * | |
630 | * Returns 0 if current can write the containing directory | |
631 | * and the directory, error code otherwise | |
632 | */ | |
633 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
634 | { | |
ecfcc53f | 635 | struct smk_audit_info ad; |
e114e473 CS |
636 | int rc; |
637 | ||
a269434d | 638 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
639 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
640 | ||
e114e473 CS |
641 | /* |
642 | * You need write access to the thing you're removing | |
643 | */ | |
ecfcc53f EB |
644 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
645 | if (rc == 0) { | |
e114e473 CS |
646 | /* |
647 | * You also need write access to the containing directory | |
648 | */ | |
ecfcc53f EB |
649 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
650 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
651 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
652 | } | |
e114e473 CS |
653 | |
654 | return rc; | |
655 | } | |
656 | ||
657 | /** | |
658 | * smack_inode_rename - Smack check on rename | |
659 | * @old_inode: the old directory | |
660 | * @old_dentry: unused | |
661 | * @new_inode: the new directory | |
662 | * @new_dentry: unused | |
663 | * | |
664 | * Read and write access is required on both the old and | |
665 | * new directories. | |
666 | * | |
667 | * Returns 0 if access is permitted, an error code otherwise | |
668 | */ | |
669 | static int smack_inode_rename(struct inode *old_inode, | |
670 | struct dentry *old_dentry, | |
671 | struct inode *new_inode, | |
672 | struct dentry *new_dentry) | |
673 | { | |
674 | int rc; | |
675 | char *isp; | |
ecfcc53f EB |
676 | struct smk_audit_info ad; |
677 | ||
a269434d | 678 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 679 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
680 | |
681 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 682 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
683 | |
684 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
685 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
686 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
687 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 688 | } |
e114e473 CS |
689 | return rc; |
690 | } | |
691 | ||
692 | /** | |
693 | * smack_inode_permission - Smack version of permission() | |
694 | * @inode: the inode in question | |
695 | * @mask: the access requested | |
e114e473 CS |
696 | * |
697 | * This is the important Smack hook. | |
698 | * | |
699 | * Returns 0 if access is permitted, -EACCES otherwise | |
700 | */ | |
e74f71eb | 701 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 702 | { |
ecfcc53f | 703 | struct smk_audit_info ad; |
e74f71eb | 704 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
705 | |
706 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
707 | /* |
708 | * No permission to check. Existence test. Yup, it's there. | |
709 | */ | |
710 | if (mask == 0) | |
711 | return 0; | |
8c9e80ed AK |
712 | |
713 | /* May be droppable after audit */ | |
e74f71eb | 714 | if (no_block) |
8c9e80ed | 715 | return -ECHILD; |
f48b7399 | 716 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
717 | smk_ad_setfield_u_fs_inode(&ad, inode); |
718 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
719 | } |
720 | ||
721 | /** | |
722 | * smack_inode_setattr - Smack check for setting attributes | |
723 | * @dentry: the object | |
724 | * @iattr: for the force flag | |
725 | * | |
726 | * Returns 0 if access is permitted, an error code otherwise | |
727 | */ | |
728 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
729 | { | |
ecfcc53f | 730 | struct smk_audit_info ad; |
e114e473 CS |
731 | /* |
732 | * Need to allow for clearing the setuid bit. | |
733 | */ | |
734 | if (iattr->ia_valid & ATTR_FORCE) | |
735 | return 0; | |
a269434d | 736 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 737 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 738 | |
ecfcc53f | 739 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
740 | } |
741 | ||
742 | /** | |
743 | * smack_inode_getattr - Smack check for getting attributes | |
744 | * @mnt: unused | |
745 | * @dentry: the object | |
746 | * | |
747 | * Returns 0 if access is permitted, an error code otherwise | |
748 | */ | |
749 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
750 | { | |
ecfcc53f | 751 | struct smk_audit_info ad; |
a269434d | 752 | struct path path; |
ecfcc53f | 753 | |
a269434d EP |
754 | path.dentry = dentry; |
755 | path.mnt = mnt; | |
ecfcc53f | 756 | |
f48b7399 | 757 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 758 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 759 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
760 | } |
761 | ||
762 | /** | |
763 | * smack_inode_setxattr - Smack check for setting xattrs | |
764 | * @dentry: the object | |
765 | * @name: name of the attribute | |
766 | * @value: unused | |
767 | * @size: unused | |
768 | * @flags: unused | |
769 | * | |
770 | * This protects the Smack attribute explicitly. | |
771 | * | |
772 | * Returns 0 if access is permitted, an error code otherwise | |
773 | */ | |
8f0cfa52 DH |
774 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
775 | const void *value, size_t size, int flags) | |
e114e473 | 776 | { |
ecfcc53f | 777 | struct smk_audit_info ad; |
bcdca225 | 778 | int rc = 0; |
e114e473 | 779 | |
bcdca225 CS |
780 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
781 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 782 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
783 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
784 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
785 | if (!capable(CAP_MAC_ADMIN)) |
786 | rc = -EPERM; | |
defc433b EB |
787 | /* |
788 | * check label validity here so import wont fail on | |
789 | * post_setxattr | |
790 | */ | |
791 | if (size == 0 || size >= SMK_LABELLEN || | |
792 | smk_import(value, size) == NULL) | |
4303154e | 793 | rc = -EINVAL; |
5c6d1125 JS |
794 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
795 | if (!capable(CAP_MAC_ADMIN)) | |
796 | rc = -EPERM; | |
797 | if (size != TRANS_TRUE_SIZE || | |
798 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
799 | rc = -EINVAL; | |
bcdca225 CS |
800 | } else |
801 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
802 | ||
a269434d | 803 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
804 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
805 | ||
bcdca225 | 806 | if (rc == 0) |
ecfcc53f | 807 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
808 | |
809 | return rc; | |
e114e473 CS |
810 | } |
811 | ||
812 | /** | |
813 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
814 | * @dentry: object | |
815 | * @name: attribute name | |
816 | * @value: attribute value | |
817 | * @size: attribute size | |
818 | * @flags: unused | |
819 | * | |
820 | * Set the pointer in the inode blob to the entry found | |
821 | * in the master label list. | |
822 | */ | |
8f0cfa52 DH |
823 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
824 | const void *value, size_t size, int flags) | |
e114e473 | 825 | { |
e114e473 | 826 | char *nsp; |
5c6d1125 | 827 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
828 | |
829 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 830 | nsp = smk_import(value, size); |
676dac4b CS |
831 | if (nsp != NULL) |
832 | isp->smk_inode = nsp; | |
833 | else | |
834 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
835 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
836 | nsp = smk_import(value, size); | |
676dac4b CS |
837 | if (nsp != NULL) |
838 | isp->smk_task = nsp; | |
839 | else | |
840 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
841 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
842 | nsp = smk_import(value, size); | |
843 | if (nsp != NULL) | |
844 | isp->smk_mmap = nsp; | |
845 | else | |
846 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
847 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
848 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
849 | |
850 | return; | |
851 | } | |
852 | ||
ce8a4321 | 853 | /** |
e114e473 CS |
854 | * smack_inode_getxattr - Smack check on getxattr |
855 | * @dentry: the object | |
856 | * @name: unused | |
857 | * | |
858 | * Returns 0 if access is permitted, an error code otherwise | |
859 | */ | |
8f0cfa52 | 860 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 861 | { |
ecfcc53f EB |
862 | struct smk_audit_info ad; |
863 | ||
a269434d | 864 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
865 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
866 | ||
867 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
868 | } |
869 | ||
ce8a4321 | 870 | /** |
e114e473 CS |
871 | * smack_inode_removexattr - Smack check on removexattr |
872 | * @dentry: the object | |
873 | * @name: name of the attribute | |
874 | * | |
875 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
876 | * | |
877 | * Returns 0 if access is permitted, an error code otherwise | |
878 | */ | |
8f0cfa52 | 879 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 880 | { |
676dac4b | 881 | struct inode_smack *isp; |
ecfcc53f | 882 | struct smk_audit_info ad; |
bcdca225 | 883 | int rc = 0; |
e114e473 | 884 | |
bcdca225 CS |
885 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
886 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 887 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 888 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
889 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
890 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
891 | if (!capable(CAP_MAC_ADMIN)) |
892 | rc = -EPERM; | |
893 | } else | |
894 | rc = cap_inode_removexattr(dentry, name); | |
895 | ||
a269434d | 896 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 897 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 898 | if (rc == 0) |
ecfcc53f | 899 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 900 | |
676dac4b CS |
901 | if (rc == 0) { |
902 | isp = dentry->d_inode->i_security; | |
903 | isp->smk_task = NULL; | |
7898e1f8 | 904 | isp->smk_mmap = NULL; |
676dac4b CS |
905 | } |
906 | ||
bcdca225 | 907 | return rc; |
e114e473 CS |
908 | } |
909 | ||
910 | /** | |
911 | * smack_inode_getsecurity - get smack xattrs | |
912 | * @inode: the object | |
913 | * @name: attribute name | |
914 | * @buffer: where to put the result | |
251a2a95 | 915 | * @alloc: unused |
e114e473 CS |
916 | * |
917 | * Returns the size of the attribute or an error code | |
918 | */ | |
919 | static int smack_inode_getsecurity(const struct inode *inode, | |
920 | const char *name, void **buffer, | |
921 | bool alloc) | |
922 | { | |
923 | struct socket_smack *ssp; | |
924 | struct socket *sock; | |
925 | struct super_block *sbp; | |
926 | struct inode *ip = (struct inode *)inode; | |
927 | char *isp; | |
928 | int ilen; | |
929 | int rc = 0; | |
930 | ||
931 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
932 | isp = smk_of_inode(inode); | |
933 | ilen = strlen(isp) + 1; | |
934 | *buffer = isp; | |
935 | return ilen; | |
936 | } | |
937 | ||
938 | /* | |
939 | * The rest of the Smack xattrs are only on sockets. | |
940 | */ | |
941 | sbp = ip->i_sb; | |
942 | if (sbp->s_magic != SOCKFS_MAGIC) | |
943 | return -EOPNOTSUPP; | |
944 | ||
945 | sock = SOCKET_I(ip); | |
2e1d146a | 946 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
947 | return -EOPNOTSUPP; |
948 | ||
949 | ssp = sock->sk->sk_security; | |
950 | ||
951 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
952 | isp = ssp->smk_in; | |
953 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
954 | isp = ssp->smk_out; | |
955 | else | |
956 | return -EOPNOTSUPP; | |
957 | ||
958 | ilen = strlen(isp) + 1; | |
959 | if (rc == 0) { | |
960 | *buffer = isp; | |
961 | rc = ilen; | |
962 | } | |
963 | ||
964 | return rc; | |
965 | } | |
966 | ||
967 | ||
968 | /** | |
969 | * smack_inode_listsecurity - list the Smack attributes | |
970 | * @inode: the object | |
971 | * @buffer: where they go | |
972 | * @buffer_size: size of buffer | |
973 | * | |
974 | * Returns 0 on success, -EINVAL otherwise | |
975 | */ | |
976 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
977 | size_t buffer_size) | |
978 | { | |
979 | int len = strlen(XATTR_NAME_SMACK); | |
980 | ||
981 | if (buffer != NULL && len <= buffer_size) { | |
982 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
983 | return len; | |
984 | } | |
985 | return -EINVAL; | |
986 | } | |
987 | ||
d20bdda6 AD |
988 | /** |
989 | * smack_inode_getsecid - Extract inode's security id | |
990 | * @inode: inode to extract the info from | |
991 | * @secid: where result will be saved | |
992 | */ | |
993 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
994 | { | |
995 | struct inode_smack *isp = inode->i_security; | |
996 | ||
997 | *secid = smack_to_secid(isp->smk_inode); | |
998 | } | |
999 | ||
e114e473 CS |
1000 | /* |
1001 | * File Hooks | |
1002 | */ | |
1003 | ||
1004 | /** | |
1005 | * smack_file_permission - Smack check on file operations | |
1006 | * @file: unused | |
1007 | * @mask: unused | |
1008 | * | |
1009 | * Returns 0 | |
1010 | * | |
1011 | * Should access checks be done on each read or write? | |
1012 | * UNICOS and SELinux say yes. | |
1013 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1014 | * | |
1015 | * I'll say no for now. Smack does not do the frequent | |
1016 | * label changing that SELinux does. | |
1017 | */ | |
1018 | static int smack_file_permission(struct file *file, int mask) | |
1019 | { | |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * smack_file_alloc_security - assign a file security blob | |
1025 | * @file: the object | |
1026 | * | |
1027 | * The security blob for a file is a pointer to the master | |
1028 | * label list, so no allocation is done. | |
1029 | * | |
1030 | * Returns 0 | |
1031 | */ | |
1032 | static int smack_file_alloc_security(struct file *file) | |
1033 | { | |
676dac4b | 1034 | file->f_security = smk_of_current(); |
e114e473 CS |
1035 | return 0; |
1036 | } | |
1037 | ||
1038 | /** | |
1039 | * smack_file_free_security - clear a file security blob | |
1040 | * @file: the object | |
1041 | * | |
1042 | * The security blob for a file is a pointer to the master | |
1043 | * label list, so no memory is freed. | |
1044 | */ | |
1045 | static void smack_file_free_security(struct file *file) | |
1046 | { | |
1047 | file->f_security = NULL; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * smack_file_ioctl - Smack check on ioctls | |
1052 | * @file: the object | |
1053 | * @cmd: what to do | |
1054 | * @arg: unused | |
1055 | * | |
1056 | * Relies heavily on the correct use of the ioctl command conventions. | |
1057 | * | |
1058 | * Returns 0 if allowed, error code otherwise | |
1059 | */ | |
1060 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1061 | unsigned long arg) | |
1062 | { | |
1063 | int rc = 0; | |
ecfcc53f EB |
1064 | struct smk_audit_info ad; |
1065 | ||
f48b7399 | 1066 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1067 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1068 | |
1069 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1070 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1071 | |
1072 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1073 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1074 | |
1075 | return rc; | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * smack_file_lock - Smack check on file locking | |
1080 | * @file: the object | |
251a2a95 | 1081 | * @cmd: unused |
e114e473 CS |
1082 | * |
1083 | * Returns 0 if current has write access, error code otherwise | |
1084 | */ | |
1085 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1086 | { | |
ecfcc53f EB |
1087 | struct smk_audit_info ad; |
1088 | ||
92f42509 EP |
1089 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1090 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1091 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1092 | } |
1093 | ||
1094 | /** | |
1095 | * smack_file_fcntl - Smack check on fcntl | |
1096 | * @file: the object | |
1097 | * @cmd: what action to check | |
1098 | * @arg: unused | |
1099 | * | |
531f1d45 CS |
1100 | * Generally these operations are harmless. |
1101 | * File locking operations present an obvious mechanism | |
1102 | * for passing information, so they require write access. | |
1103 | * | |
e114e473 CS |
1104 | * Returns 0 if current has access, error code otherwise |
1105 | */ | |
1106 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1107 | unsigned long arg) | |
1108 | { | |
ecfcc53f | 1109 | struct smk_audit_info ad; |
531f1d45 | 1110 | int rc = 0; |
e114e473 | 1111 | |
ecfcc53f | 1112 | |
e114e473 | 1113 | switch (cmd) { |
e114e473 | 1114 | case F_GETLK: |
e114e473 CS |
1115 | case F_SETLK: |
1116 | case F_SETLKW: | |
1117 | case F_SETOWN: | |
1118 | case F_SETSIG: | |
531f1d45 CS |
1119 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1120 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1121 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1122 | break; |
1123 | default: | |
531f1d45 | 1124 | break; |
e114e473 CS |
1125 | } |
1126 | ||
1127 | return rc; | |
1128 | } | |
1129 | ||
7898e1f8 CS |
1130 | /** |
1131 | * smack_file_mmap : | |
1132 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1133 | * if mapping anonymous memory. | |
1134 | * @file contains the file structure for file to map (may be NULL). | |
1135 | * @reqprot contains the protection requested by the application. | |
1136 | * @prot contains the protection that will be applied by the kernel. | |
1137 | * @flags contains the operational flags. | |
1138 | * Return 0 if permission is granted. | |
1139 | */ | |
1140 | static int smack_file_mmap(struct file *file, | |
1141 | unsigned long reqprot, unsigned long prot, | |
1142 | unsigned long flags, unsigned long addr, | |
1143 | unsigned long addr_only) | |
1144 | { | |
272cd7a8 | 1145 | struct smack_known *skp; |
7898e1f8 CS |
1146 | struct smack_rule *srp; |
1147 | struct task_smack *tsp; | |
1148 | char *sp; | |
1149 | char *msmack; | |
0e0a070d | 1150 | char *osmack; |
7898e1f8 CS |
1151 | struct inode_smack *isp; |
1152 | struct dentry *dp; | |
0e0a070d CS |
1153 | int may; |
1154 | int mmay; | |
1155 | int tmay; | |
7898e1f8 CS |
1156 | int rc; |
1157 | ||
1158 | /* do DAC check on address space usage */ | |
1159 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1160 | if (rc || addr_only) | |
1161 | return rc; | |
1162 | ||
1163 | if (file == NULL || file->f_dentry == NULL) | |
1164 | return 0; | |
1165 | ||
1166 | dp = file->f_dentry; | |
1167 | ||
1168 | if (dp->d_inode == NULL) | |
1169 | return 0; | |
1170 | ||
1171 | isp = dp->d_inode->i_security; | |
1172 | if (isp->smk_mmap == NULL) | |
1173 | return 0; | |
1174 | msmack = isp->smk_mmap; | |
1175 | ||
1176 | tsp = current_security(); | |
1177 | sp = smk_of_current(); | |
272cd7a8 | 1178 | skp = smk_find_entry(sp); |
7898e1f8 CS |
1179 | rc = 0; |
1180 | ||
1181 | rcu_read_lock(); | |
1182 | /* | |
1183 | * For each Smack rule associated with the subject | |
1184 | * label verify that the SMACK64MMAP also has access | |
1185 | * to that rule's object label. | |
7898e1f8 | 1186 | */ |
272cd7a8 | 1187 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1188 | osmack = srp->smk_object; |
7898e1f8 CS |
1189 | /* |
1190 | * Matching labels always allows access. | |
1191 | */ | |
0e0a070d | 1192 | if (msmack == osmack) |
7898e1f8 | 1193 | continue; |
0e0a070d CS |
1194 | /* |
1195 | * If there is a matching local rule take | |
1196 | * that into account as well. | |
1197 | */ | |
1198 | may = smk_access_entry(srp->smk_subject, osmack, | |
1199 | &tsp->smk_rules); | |
1200 | if (may == -ENOENT) | |
1201 | may = srp->smk_access; | |
1202 | else | |
1203 | may &= srp->smk_access; | |
1204 | /* | |
1205 | * If may is zero the SMACK64MMAP subject can't | |
1206 | * possibly have less access. | |
1207 | */ | |
1208 | if (may == 0) | |
1209 | continue; | |
1210 | ||
1211 | /* | |
1212 | * Fetch the global list entry. | |
1213 | * If there isn't one a SMACK64MMAP subject | |
1214 | * can't have as much access as current. | |
1215 | */ | |
272cd7a8 CS |
1216 | skp = smk_find_entry(msmack); |
1217 | mmay = smk_access_entry(msmack, osmack, &skp->smk_rules); | |
0e0a070d CS |
1218 | if (mmay == -ENOENT) { |
1219 | rc = -EACCES; | |
1220 | break; | |
1221 | } | |
1222 | /* | |
1223 | * If there is a local entry it modifies the | |
1224 | * potential access, too. | |
1225 | */ | |
1226 | tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules); | |
1227 | if (tmay != -ENOENT) | |
1228 | mmay &= tmay; | |
7898e1f8 | 1229 | |
0e0a070d CS |
1230 | /* |
1231 | * If there is any access available to current that is | |
1232 | * not available to a SMACK64MMAP subject | |
1233 | * deny access. | |
1234 | */ | |
75a25637 | 1235 | if ((may | mmay) != mmay) { |
0e0a070d | 1236 | rc = -EACCES; |
7898e1f8 | 1237 | break; |
0e0a070d | 1238 | } |
7898e1f8 CS |
1239 | } |
1240 | ||
1241 | rcu_read_unlock(); | |
1242 | ||
1243 | return rc; | |
1244 | } | |
1245 | ||
e114e473 CS |
1246 | /** |
1247 | * smack_file_set_fowner - set the file security blob value | |
1248 | * @file: object in question | |
1249 | * | |
1250 | * Returns 0 | |
1251 | * Further research may be required on this one. | |
1252 | */ | |
1253 | static int smack_file_set_fowner(struct file *file) | |
1254 | { | |
676dac4b | 1255 | file->f_security = smk_of_current(); |
e114e473 CS |
1256 | return 0; |
1257 | } | |
1258 | ||
1259 | /** | |
1260 | * smack_file_send_sigiotask - Smack on sigio | |
1261 | * @tsk: The target task | |
1262 | * @fown: the object the signal come from | |
1263 | * @signum: unused | |
1264 | * | |
1265 | * Allow a privileged task to get signals even if it shouldn't | |
1266 | * | |
1267 | * Returns 0 if a subject with the object's smack could | |
1268 | * write to the task, an error code otherwise. | |
1269 | */ | |
1270 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1271 | struct fown_struct *fown, int signum) | |
1272 | { | |
1273 | struct file *file; | |
1274 | int rc; | |
676dac4b | 1275 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1276 | struct smk_audit_info ad; |
e114e473 CS |
1277 | |
1278 | /* | |
1279 | * struct fown_struct is never outside the context of a struct file | |
1280 | */ | |
1281 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1282 | |
ecfcc53f EB |
1283 | /* we don't log here as rc can be overriden */ |
1284 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1285 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1286 | rc = 0; |
1287 | ||
1288 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1289 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1290 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1291 | return rc; |
1292 | } | |
1293 | ||
1294 | /** | |
1295 | * smack_file_receive - Smack file receive check | |
1296 | * @file: the object | |
1297 | * | |
1298 | * Returns 0 if current has access, error code otherwise | |
1299 | */ | |
1300 | static int smack_file_receive(struct file *file) | |
1301 | { | |
1302 | int may = 0; | |
ecfcc53f | 1303 | struct smk_audit_info ad; |
e114e473 | 1304 | |
ecfcc53f EB |
1305 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1306 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1307 | /* |
1308 | * This code relies on bitmasks. | |
1309 | */ | |
1310 | if (file->f_mode & FMODE_READ) | |
1311 | may = MAY_READ; | |
1312 | if (file->f_mode & FMODE_WRITE) | |
1313 | may |= MAY_WRITE; | |
1314 | ||
ecfcc53f | 1315 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1316 | } |
1317 | ||
531f1d45 CS |
1318 | /** |
1319 | * smack_dentry_open - Smack dentry open processing | |
1320 | * @file: the object | |
1321 | * @cred: unused | |
1322 | * | |
1323 | * Set the security blob in the file structure. | |
1324 | * | |
1325 | * Returns 0 | |
1326 | */ | |
1327 | static int smack_dentry_open(struct file *file, const struct cred *cred) | |
1328 | { | |
1329 | struct inode_smack *isp = file->f_path.dentry->d_inode->i_security; | |
1330 | ||
1331 | file->f_security = isp->smk_inode; | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
e114e473 CS |
1336 | /* |
1337 | * Task hooks | |
1338 | */ | |
1339 | ||
ee18d64c DH |
1340 | /** |
1341 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1342 | * @new: the new credentials | |
1343 | * @gfp: the atomicity of any memory allocations | |
1344 | * | |
1345 | * Prepare a blank set of credentials for modification. This must allocate all | |
1346 | * the memory the LSM module might require such that cred_transfer() can | |
1347 | * complete without error. | |
1348 | */ | |
1349 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1350 | { | |
7898e1f8 CS |
1351 | struct task_smack *tsp; |
1352 | ||
1353 | tsp = new_task_smack(NULL, NULL, gfp); | |
1354 | if (tsp == NULL) | |
676dac4b | 1355 | return -ENOMEM; |
7898e1f8 CS |
1356 | |
1357 | cred->security = tsp; | |
1358 | ||
ee18d64c DH |
1359 | return 0; |
1360 | } | |
1361 | ||
1362 | ||
e114e473 | 1363 | /** |
f1752eec DH |
1364 | * smack_cred_free - "free" task-level security credentials |
1365 | * @cred: the credentials in question | |
e114e473 | 1366 | * |
e114e473 | 1367 | */ |
f1752eec | 1368 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1369 | { |
7898e1f8 CS |
1370 | struct task_smack *tsp = cred->security; |
1371 | struct smack_rule *rp; | |
1372 | struct list_head *l; | |
1373 | struct list_head *n; | |
1374 | ||
1375 | if (tsp == NULL) | |
1376 | return; | |
1377 | cred->security = NULL; | |
1378 | ||
1379 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1380 | rp = list_entry(l, struct smack_rule, list); | |
1381 | list_del(&rp->list); | |
1382 | kfree(rp); | |
1383 | } | |
1384 | kfree(tsp); | |
e114e473 CS |
1385 | } |
1386 | ||
d84f4f99 DH |
1387 | /** |
1388 | * smack_cred_prepare - prepare new set of credentials for modification | |
1389 | * @new: the new credentials | |
1390 | * @old: the original credentials | |
1391 | * @gfp: the atomicity of any memory allocations | |
1392 | * | |
1393 | * Prepare a new set of credentials for modification. | |
1394 | */ | |
1395 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1396 | gfp_t gfp) | |
1397 | { | |
676dac4b CS |
1398 | struct task_smack *old_tsp = old->security; |
1399 | struct task_smack *new_tsp; | |
7898e1f8 | 1400 | int rc; |
676dac4b | 1401 | |
7898e1f8 | 1402 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1403 | if (new_tsp == NULL) |
1404 | return -ENOMEM; | |
1405 | ||
7898e1f8 CS |
1406 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1407 | if (rc != 0) | |
1408 | return rc; | |
1409 | ||
676dac4b | 1410 | new->security = new_tsp; |
d84f4f99 DH |
1411 | return 0; |
1412 | } | |
1413 | ||
ee18d64c DH |
1414 | /** |
1415 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1416 | * @new: the new credentials | |
1417 | * @old: the original credentials | |
1418 | * | |
1419 | * Fill in a set of blank credentials from another set of credentials. | |
1420 | */ | |
1421 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1422 | { | |
676dac4b CS |
1423 | struct task_smack *old_tsp = old->security; |
1424 | struct task_smack *new_tsp = new->security; | |
1425 | ||
1426 | new_tsp->smk_task = old_tsp->smk_task; | |
1427 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1428 | mutex_init(&new_tsp->smk_rules_lock); |
1429 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1430 | ||
1431 | ||
1432 | /* cbs copy rule list */ | |
ee18d64c DH |
1433 | } |
1434 | ||
3a3b7ce9 DH |
1435 | /** |
1436 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1437 | * @new: points to the set of credentials to be modified. |
1438 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1439 | * |
1440 | * Set the security data for a kernel service. | |
1441 | */ | |
1442 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1443 | { | |
676dac4b | 1444 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1445 | char *smack = smack_from_secid(secid); |
1446 | ||
1447 | if (smack == NULL) | |
1448 | return -EINVAL; | |
1449 | ||
676dac4b | 1450 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1451 | return 0; |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1456 | * @new: points to the set of credentials to be modified |
1457 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1458 | * |
1459 | * Set the file creation context in a set of credentials to the same | |
1460 | * as the objective context of the specified inode | |
1461 | */ | |
1462 | static int smack_kernel_create_files_as(struct cred *new, | |
1463 | struct inode *inode) | |
1464 | { | |
1465 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1466 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1467 | |
676dac4b CS |
1468 | tsp->smk_forked = isp->smk_inode; |
1469 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1470 | return 0; |
1471 | } | |
1472 | ||
ecfcc53f EB |
1473 | /** |
1474 | * smk_curacc_on_task - helper to log task related access | |
1475 | * @p: the task object | |
531f1d45 CS |
1476 | * @access: the access requested |
1477 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1478 | * |
1479 | * Return 0 if access is permitted | |
1480 | */ | |
531f1d45 CS |
1481 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1482 | const char *caller) | |
ecfcc53f EB |
1483 | { |
1484 | struct smk_audit_info ad; | |
1485 | ||
531f1d45 | 1486 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1487 | smk_ad_setfield_u_tsk(&ad, p); |
676dac4b | 1488 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1489 | } |
1490 | ||
e114e473 CS |
1491 | /** |
1492 | * smack_task_setpgid - Smack check on setting pgid | |
1493 | * @p: the task object | |
1494 | * @pgid: unused | |
1495 | * | |
1496 | * Return 0 if write access is permitted | |
1497 | */ | |
1498 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1499 | { | |
531f1d45 | 1500 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1501 | } |
1502 | ||
1503 | /** | |
1504 | * smack_task_getpgid - Smack access check for getpgid | |
1505 | * @p: the object task | |
1506 | * | |
1507 | * Returns 0 if current can read the object task, error code otherwise | |
1508 | */ | |
1509 | static int smack_task_getpgid(struct task_struct *p) | |
1510 | { | |
531f1d45 | 1511 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1512 | } |
1513 | ||
1514 | /** | |
1515 | * smack_task_getsid - Smack access check for getsid | |
1516 | * @p: the object task | |
1517 | * | |
1518 | * Returns 0 if current can read the object task, error code otherwise | |
1519 | */ | |
1520 | static int smack_task_getsid(struct task_struct *p) | |
1521 | { | |
531f1d45 | 1522 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1523 | } |
1524 | ||
1525 | /** | |
1526 | * smack_task_getsecid - get the secid of the task | |
1527 | * @p: the object task | |
1528 | * @secid: where to put the result | |
1529 | * | |
1530 | * Sets the secid to contain a u32 version of the smack label. | |
1531 | */ | |
1532 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1533 | { | |
676dac4b | 1534 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1535 | } |
1536 | ||
1537 | /** | |
1538 | * smack_task_setnice - Smack check on setting nice | |
1539 | * @p: the task object | |
1540 | * @nice: unused | |
1541 | * | |
1542 | * Return 0 if write access is permitted | |
1543 | */ | |
1544 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1545 | { | |
bcdca225 CS |
1546 | int rc; |
1547 | ||
1548 | rc = cap_task_setnice(p, nice); | |
1549 | if (rc == 0) | |
531f1d45 | 1550 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1551 | return rc; |
e114e473 CS |
1552 | } |
1553 | ||
1554 | /** | |
1555 | * smack_task_setioprio - Smack check on setting ioprio | |
1556 | * @p: the task object | |
1557 | * @ioprio: unused | |
1558 | * | |
1559 | * Return 0 if write access is permitted | |
1560 | */ | |
1561 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1562 | { | |
bcdca225 CS |
1563 | int rc; |
1564 | ||
1565 | rc = cap_task_setioprio(p, ioprio); | |
1566 | if (rc == 0) | |
531f1d45 | 1567 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1568 | return rc; |
e114e473 CS |
1569 | } |
1570 | ||
1571 | /** | |
1572 | * smack_task_getioprio - Smack check on reading ioprio | |
1573 | * @p: the task object | |
1574 | * | |
1575 | * Return 0 if read access is permitted | |
1576 | */ | |
1577 | static int smack_task_getioprio(struct task_struct *p) | |
1578 | { | |
531f1d45 | 1579 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1580 | } |
1581 | ||
1582 | /** | |
1583 | * smack_task_setscheduler - Smack check on setting scheduler | |
1584 | * @p: the task object | |
1585 | * @policy: unused | |
1586 | * @lp: unused | |
1587 | * | |
1588 | * Return 0 if read access is permitted | |
1589 | */ | |
b0ae1981 | 1590 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1591 | { |
bcdca225 CS |
1592 | int rc; |
1593 | ||
b0ae1981 | 1594 | rc = cap_task_setscheduler(p); |
bcdca225 | 1595 | if (rc == 0) |
531f1d45 | 1596 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1597 | return rc; |
e114e473 CS |
1598 | } |
1599 | ||
1600 | /** | |
1601 | * smack_task_getscheduler - Smack check on reading scheduler | |
1602 | * @p: the task object | |
1603 | * | |
1604 | * Return 0 if read access is permitted | |
1605 | */ | |
1606 | static int smack_task_getscheduler(struct task_struct *p) | |
1607 | { | |
531f1d45 | 1608 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1609 | } |
1610 | ||
1611 | /** | |
1612 | * smack_task_movememory - Smack check on moving memory | |
1613 | * @p: the task object | |
1614 | * | |
1615 | * Return 0 if write access is permitted | |
1616 | */ | |
1617 | static int smack_task_movememory(struct task_struct *p) | |
1618 | { | |
531f1d45 | 1619 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1620 | } |
1621 | ||
1622 | /** | |
1623 | * smack_task_kill - Smack check on signal delivery | |
1624 | * @p: the task object | |
1625 | * @info: unused | |
1626 | * @sig: unused | |
1627 | * @secid: identifies the smack to use in lieu of current's | |
1628 | * | |
1629 | * Return 0 if write access is permitted | |
1630 | * | |
1631 | * The secid behavior is an artifact of an SELinux hack | |
1632 | * in the USB code. Someday it may go away. | |
1633 | */ | |
1634 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1635 | int sig, u32 secid) | |
1636 | { | |
ecfcc53f EB |
1637 | struct smk_audit_info ad; |
1638 | ||
1639 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1640 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1641 | /* |
1642 | * Sending a signal requires that the sender | |
1643 | * can write the receiver. | |
1644 | */ | |
1645 | if (secid == 0) | |
676dac4b CS |
1646 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1647 | &ad); | |
e114e473 CS |
1648 | /* |
1649 | * If the secid isn't 0 we're dealing with some USB IO | |
1650 | * specific behavior. This is not clean. For one thing | |
1651 | * we can't take privilege into account. | |
1652 | */ | |
676dac4b CS |
1653 | return smk_access(smack_from_secid(secid), |
1654 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1655 | } |
1656 | ||
1657 | /** | |
1658 | * smack_task_wait - Smack access check for waiting | |
1659 | * @p: task to wait for | |
1660 | * | |
1661 | * Returns 0 if current can wait for p, error code otherwise | |
1662 | */ | |
1663 | static int smack_task_wait(struct task_struct *p) | |
1664 | { | |
ecfcc53f | 1665 | struct smk_audit_info ad; |
676dac4b CS |
1666 | char *sp = smk_of_current(); |
1667 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1668 | int rc; |
1669 | ||
ecfcc53f | 1670 | /* we don't log here, we can be overriden */ |
676dac4b | 1671 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1672 | if (rc == 0) |
ecfcc53f | 1673 | goto out_log; |
e114e473 CS |
1674 | |
1675 | /* | |
1676 | * Allow the operation to succeed if either task | |
1677 | * has privilege to perform operations that might | |
1678 | * account for the smack labels having gotten to | |
1679 | * be different in the first place. | |
1680 | * | |
5cd9c58f | 1681 | * This breaks the strict subject/object access |
e114e473 CS |
1682 | * control ideal, taking the object's privilege |
1683 | * state into account in the decision as well as | |
1684 | * the smack value. | |
1685 | */ | |
5cd9c58f | 1686 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1687 | rc = 0; |
1688 | /* we log only if we didn't get overriden */ | |
1689 | out_log: | |
1690 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1691 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1692 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1693 | return rc; |
1694 | } | |
1695 | ||
1696 | /** | |
1697 | * smack_task_to_inode - copy task smack into the inode blob | |
1698 | * @p: task to copy from | |
251a2a95 | 1699 | * @inode: inode to copy to |
e114e473 CS |
1700 | * |
1701 | * Sets the smack pointer in the inode security blob | |
1702 | */ | |
1703 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1704 | { | |
1705 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1706 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1707 | } |
1708 | ||
1709 | /* | |
1710 | * Socket hooks. | |
1711 | */ | |
1712 | ||
1713 | /** | |
1714 | * smack_sk_alloc_security - Allocate a socket blob | |
1715 | * @sk: the socket | |
1716 | * @family: unused | |
251a2a95 | 1717 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1718 | * |
1719 | * Assign Smack pointers to current | |
1720 | * | |
1721 | * Returns 0 on success, -ENOMEM is there's no memory | |
1722 | */ | |
1723 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1724 | { | |
676dac4b | 1725 | char *csp = smk_of_current(); |
e114e473 CS |
1726 | struct socket_smack *ssp; |
1727 | ||
1728 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1729 | if (ssp == NULL) | |
1730 | return -ENOMEM; | |
1731 | ||
1732 | ssp->smk_in = csp; | |
1733 | ssp->smk_out = csp; | |
272cd7a8 | 1734 | ssp->smk_packet = NULL; |
e114e473 CS |
1735 | |
1736 | sk->sk_security = ssp; | |
1737 | ||
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * smack_sk_free_security - Free a socket blob | |
1743 | * @sk: the socket | |
1744 | * | |
1745 | * Clears the blob pointer | |
1746 | */ | |
1747 | static void smack_sk_free_security(struct sock *sk) | |
1748 | { | |
1749 | kfree(sk->sk_security); | |
1750 | } | |
1751 | ||
07feee8f PM |
1752 | /** |
1753 | * smack_host_label - check host based restrictions | |
1754 | * @sip: the object end | |
1755 | * | |
1756 | * looks for host based access restrictions | |
1757 | * | |
1758 | * This version will only be appropriate for really small sets of single label | |
1759 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1760 | * taken before calling this function. | |
1761 | * | |
1762 | * Returns the label of the far end or NULL if it's not special. | |
1763 | */ | |
1764 | static char *smack_host_label(struct sockaddr_in *sip) | |
1765 | { | |
1766 | struct smk_netlbladdr *snp; | |
1767 | struct in_addr *siap = &sip->sin_addr; | |
1768 | ||
1769 | if (siap->s_addr == 0) | |
1770 | return NULL; | |
1771 | ||
1772 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1773 | /* | |
1774 | * we break after finding the first match because | |
1775 | * the list is sorted from longest to shortest mask | |
1776 | * so we have found the most specific match | |
1777 | */ | |
1778 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1779 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1780 | /* we have found the special CIPSO option */ | |
1781 | if (snp->smk_label == smack_cipso_option) | |
1782 | return NULL; | |
07feee8f | 1783 | return snp->smk_label; |
4303154e | 1784 | } |
07feee8f PM |
1785 | |
1786 | return NULL; | |
1787 | } | |
1788 | ||
e114e473 CS |
1789 | /** |
1790 | * smack_set_catset - convert a capset to netlabel mls categories | |
1791 | * @catset: the Smack categories | |
1792 | * @sap: where to put the netlabel categories | |
1793 | * | |
1794 | * Allocates and fills attr.mls.cat | |
1795 | */ | |
1796 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1797 | { | |
1798 | unsigned char *cp; | |
1799 | unsigned char m; | |
1800 | int cat; | |
1801 | int rc; | |
1802 | int byte; | |
1803 | ||
c60264c4 | 1804 | if (!catset) |
e114e473 CS |
1805 | return; |
1806 | ||
1807 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1808 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1809 | sap->attr.mls.cat->startbit = 0; | |
1810 | ||
1811 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1812 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1813 | if ((m & *cp) == 0) | |
1814 | continue; | |
1815 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1816 | cat, GFP_ATOMIC); | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * smack_to_secattr - fill a secattr from a smack value | |
1822 | * @smack: the smack value | |
1823 | * @nlsp: where the result goes | |
1824 | * | |
1825 | * Casey says that CIPSO is good enough for now. | |
1826 | * It can be used to effect. | |
1827 | * It can also be abused to effect when necessary. | |
25985edc | 1828 | * Apologies to the TSIG group in general and GW in particular. |
e114e473 CS |
1829 | */ |
1830 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1831 | { | |
1832 | struct smack_cipso cipso; | |
1833 | int rc; | |
1834 | ||
6d3dc07c CS |
1835 | nlsp->domain = smack; |
1836 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1837 | |
6d3dc07c CS |
1838 | rc = smack_to_cipso(smack, &cipso); |
1839 | if (rc == 0) { | |
1840 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1841 | smack_set_catset(cipso.smk_catset, nlsp); | |
1842 | } else { | |
1843 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1844 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1845 | } |
1846 | } | |
1847 | ||
1848 | /** | |
1849 | * smack_netlabel - Set the secattr on a socket | |
1850 | * @sk: the socket | |
6d3dc07c | 1851 | * @labeled: socket label scheme |
e114e473 CS |
1852 | * |
1853 | * Convert the outbound smack value (smk_out) to a | |
1854 | * secattr and attach it to the socket. | |
1855 | * | |
1856 | * Returns 0 on success or an error code | |
1857 | */ | |
6d3dc07c | 1858 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1859 | { |
07feee8f | 1860 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1861 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1862 | int rc = 0; |
e114e473 | 1863 | |
6d3dc07c CS |
1864 | /* |
1865 | * Usually the netlabel code will handle changing the | |
1866 | * packet labeling based on the label. | |
1867 | * The case of a single label host is different, because | |
1868 | * a single label host should never get a labeled packet | |
1869 | * even though the label is usually associated with a packet | |
1870 | * label. | |
1871 | */ | |
1872 | local_bh_disable(); | |
1873 | bh_lock_sock_nested(sk); | |
1874 | ||
1875 | if (ssp->smk_out == smack_net_ambient || | |
1876 | labeled == SMACK_UNLABELED_SOCKET) | |
1877 | netlbl_sock_delattr(sk); | |
1878 | else { | |
1879 | netlbl_secattr_init(&secattr); | |
1880 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1881 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1882 | netlbl_secattr_destroy(&secattr); |
1883 | } | |
1884 | ||
1885 | bh_unlock_sock(sk); | |
1886 | local_bh_enable(); | |
4bc87e62 | 1887 | |
e114e473 CS |
1888 | return rc; |
1889 | } | |
1890 | ||
07feee8f PM |
1891 | /** |
1892 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1893 | * @sk: the socket | |
1894 | * @sap: the destination address | |
1895 | * | |
1896 | * Set the correct secattr for the given socket based on the destination | |
1897 | * address and perform any outbound access checks needed. | |
1898 | * | |
1899 | * Returns 0 on success or an error code. | |
1900 | * | |
1901 | */ | |
1902 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1903 | { | |
1904 | int rc; | |
1905 | int sk_lbl; | |
1906 | char *hostsp; | |
1907 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1908 | struct smk_audit_info ad; |
07feee8f PM |
1909 | |
1910 | rcu_read_lock(); | |
1911 | hostsp = smack_host_label(sap); | |
1912 | if (hostsp != NULL) { | |
1913 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1914 | #ifdef CONFIG_AUDIT |
1915 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1916 | ad.a.u.net.family = sap->sin_family; | |
1917 | ad.a.u.net.dport = sap->sin_port; | |
1918 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1919 | #endif | |
1920 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1921 | } else { |
1922 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1923 | rc = 0; | |
1924 | } | |
1925 | rcu_read_unlock(); | |
1926 | if (rc != 0) | |
1927 | return rc; | |
1928 | ||
1929 | return smack_netlabel(sk, sk_lbl); | |
1930 | } | |
1931 | ||
e114e473 CS |
1932 | /** |
1933 | * smack_inode_setsecurity - set smack xattrs | |
1934 | * @inode: the object | |
1935 | * @name: attribute name | |
1936 | * @value: attribute value | |
1937 | * @size: size of the attribute | |
1938 | * @flags: unused | |
1939 | * | |
1940 | * Sets the named attribute in the appropriate blob | |
1941 | * | |
1942 | * Returns 0 on success, or an error code | |
1943 | */ | |
1944 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1945 | const void *value, size_t size, int flags) | |
1946 | { | |
1947 | char *sp; | |
1948 | struct inode_smack *nsp = inode->i_security; | |
1949 | struct socket_smack *ssp; | |
1950 | struct socket *sock; | |
4bc87e62 | 1951 | int rc = 0; |
e114e473 | 1952 | |
4303154e | 1953 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1954 | return -EACCES; |
1955 | ||
1956 | sp = smk_import(value, size); | |
1957 | if (sp == NULL) | |
1958 | return -EINVAL; | |
1959 | ||
1960 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1961 | nsp->smk_inode = sp; | |
ddd29ec6 | 1962 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1963 | return 0; |
1964 | } | |
1965 | /* | |
1966 | * The rest of the Smack xattrs are only on sockets. | |
1967 | */ | |
1968 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1969 | return -EOPNOTSUPP; | |
1970 | ||
1971 | sock = SOCKET_I(inode); | |
2e1d146a | 1972 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1973 | return -EOPNOTSUPP; |
1974 | ||
1975 | ssp = sock->sk->sk_security; | |
1976 | ||
1977 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1978 | ssp->smk_in = sp; | |
1979 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1980 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
1981 | if (sock->sk->sk_family != PF_UNIX) { |
1982 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
1983 | if (rc != 0) | |
1984 | printk(KERN_WARNING | |
1985 | "Smack: \"%s\" netlbl error %d.\n", | |
1986 | __func__, -rc); | |
1987 | } | |
e114e473 CS |
1988 | } else |
1989 | return -EOPNOTSUPP; | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | /** | |
1995 | * smack_socket_post_create - finish socket setup | |
1996 | * @sock: the socket | |
1997 | * @family: protocol family | |
1998 | * @type: unused | |
1999 | * @protocol: unused | |
2000 | * @kern: unused | |
2001 | * | |
2002 | * Sets the netlabel information on the socket | |
2003 | * | |
2004 | * Returns 0 on success, and error code otherwise | |
2005 | */ | |
2006 | static int smack_socket_post_create(struct socket *sock, int family, | |
2007 | int type, int protocol, int kern) | |
2008 | { | |
2e1d146a | 2009 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2010 | return 0; |
2011 | /* | |
2012 | * Set the outbound netlbl. | |
2013 | */ | |
6d3dc07c CS |
2014 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2015 | } | |
2016 | ||
6d3dc07c CS |
2017 | /** |
2018 | * smack_socket_connect - connect access check | |
2019 | * @sock: the socket | |
2020 | * @sap: the other end | |
2021 | * @addrlen: size of sap | |
2022 | * | |
2023 | * Verifies that a connection may be possible | |
2024 | * | |
2025 | * Returns 0 on success, and error code otherwise | |
2026 | */ | |
2027 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2028 | int addrlen) | |
2029 | { | |
6d3dc07c CS |
2030 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
2031 | return 0; | |
6d3dc07c CS |
2032 | if (addrlen < sizeof(struct sockaddr_in)) |
2033 | return -EINVAL; | |
2034 | ||
07feee8f | 2035 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
2036 | } |
2037 | ||
2038 | /** | |
2039 | * smack_flags_to_may - convert S_ to MAY_ values | |
2040 | * @flags: the S_ value | |
2041 | * | |
2042 | * Returns the equivalent MAY_ value | |
2043 | */ | |
2044 | static int smack_flags_to_may(int flags) | |
2045 | { | |
2046 | int may = 0; | |
2047 | ||
2048 | if (flags & S_IRUGO) | |
2049 | may |= MAY_READ; | |
2050 | if (flags & S_IWUGO) | |
2051 | may |= MAY_WRITE; | |
2052 | if (flags & S_IXUGO) | |
2053 | may |= MAY_EXEC; | |
2054 | ||
2055 | return may; | |
2056 | } | |
2057 | ||
2058 | /** | |
2059 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2060 | * @msg: the object | |
2061 | * | |
2062 | * Returns 0 | |
2063 | */ | |
2064 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2065 | { | |
676dac4b | 2066 | msg->security = smk_of_current(); |
e114e473 CS |
2067 | return 0; |
2068 | } | |
2069 | ||
2070 | /** | |
2071 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2072 | * @msg: the object | |
2073 | * | |
2074 | * Clears the blob pointer | |
2075 | */ | |
2076 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2077 | { | |
2078 | msg->security = NULL; | |
2079 | } | |
2080 | ||
2081 | /** | |
2082 | * smack_of_shm - the smack pointer for the shm | |
2083 | * @shp: the object | |
2084 | * | |
2085 | * Returns a pointer to the smack value | |
2086 | */ | |
2087 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2088 | { | |
2089 | return (char *)shp->shm_perm.security; | |
2090 | } | |
2091 | ||
2092 | /** | |
2093 | * smack_shm_alloc_security - Set the security blob for shm | |
2094 | * @shp: the object | |
2095 | * | |
2096 | * Returns 0 | |
2097 | */ | |
2098 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2099 | { | |
2100 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2101 | ||
676dac4b | 2102 | isp->security = smk_of_current(); |
e114e473 CS |
2103 | return 0; |
2104 | } | |
2105 | ||
2106 | /** | |
2107 | * smack_shm_free_security - Clear the security blob for shm | |
2108 | * @shp: the object | |
2109 | * | |
2110 | * Clears the blob pointer | |
2111 | */ | |
2112 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2113 | { | |
2114 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2115 | ||
2116 | isp->security = NULL; | |
2117 | } | |
2118 | ||
ecfcc53f EB |
2119 | /** |
2120 | * smk_curacc_shm : check if current has access on shm | |
2121 | * @shp : the object | |
2122 | * @access : access requested | |
2123 | * | |
2124 | * Returns 0 if current has the requested access, error code otherwise | |
2125 | */ | |
2126 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2127 | { | |
2128 | char *ssp = smack_of_shm(shp); | |
2129 | struct smk_audit_info ad; | |
2130 | ||
2131 | #ifdef CONFIG_AUDIT | |
2132 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2133 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2134 | #endif | |
2135 | return smk_curacc(ssp, access, &ad); | |
2136 | } | |
2137 | ||
e114e473 CS |
2138 | /** |
2139 | * smack_shm_associate - Smack access check for shm | |
2140 | * @shp: the object | |
2141 | * @shmflg: access requested | |
2142 | * | |
2143 | * Returns 0 if current has the requested access, error code otherwise | |
2144 | */ | |
2145 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2146 | { | |
e114e473 CS |
2147 | int may; |
2148 | ||
2149 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2150 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2151 | } |
2152 | ||
2153 | /** | |
2154 | * smack_shm_shmctl - Smack access check for shm | |
2155 | * @shp: the object | |
2156 | * @cmd: what it wants to do | |
2157 | * | |
2158 | * Returns 0 if current has the requested access, error code otherwise | |
2159 | */ | |
2160 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2161 | { | |
e114e473 CS |
2162 | int may; |
2163 | ||
2164 | switch (cmd) { | |
2165 | case IPC_STAT: | |
2166 | case SHM_STAT: | |
2167 | may = MAY_READ; | |
2168 | break; | |
2169 | case IPC_SET: | |
2170 | case SHM_LOCK: | |
2171 | case SHM_UNLOCK: | |
2172 | case IPC_RMID: | |
2173 | may = MAY_READWRITE; | |
2174 | break; | |
2175 | case IPC_INFO: | |
2176 | case SHM_INFO: | |
2177 | /* | |
2178 | * System level information. | |
2179 | */ | |
2180 | return 0; | |
2181 | default: | |
2182 | return -EINVAL; | |
2183 | } | |
ecfcc53f | 2184 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2185 | } |
2186 | ||
2187 | /** | |
2188 | * smack_shm_shmat - Smack access for shmat | |
2189 | * @shp: the object | |
2190 | * @shmaddr: unused | |
2191 | * @shmflg: access requested | |
2192 | * | |
2193 | * Returns 0 if current has the requested access, error code otherwise | |
2194 | */ | |
2195 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2196 | int shmflg) | |
2197 | { | |
e114e473 CS |
2198 | int may; |
2199 | ||
2200 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2201 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2202 | } |
2203 | ||
2204 | /** | |
2205 | * smack_of_sem - the smack pointer for the sem | |
2206 | * @sma: the object | |
2207 | * | |
2208 | * Returns a pointer to the smack value | |
2209 | */ | |
2210 | static char *smack_of_sem(struct sem_array *sma) | |
2211 | { | |
2212 | return (char *)sma->sem_perm.security; | |
2213 | } | |
2214 | ||
2215 | /** | |
2216 | * smack_sem_alloc_security - Set the security blob for sem | |
2217 | * @sma: the object | |
2218 | * | |
2219 | * Returns 0 | |
2220 | */ | |
2221 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2222 | { | |
2223 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2224 | ||
676dac4b | 2225 | isp->security = smk_of_current(); |
e114e473 CS |
2226 | return 0; |
2227 | } | |
2228 | ||
2229 | /** | |
2230 | * smack_sem_free_security - Clear the security blob for sem | |
2231 | * @sma: the object | |
2232 | * | |
2233 | * Clears the blob pointer | |
2234 | */ | |
2235 | static void smack_sem_free_security(struct sem_array *sma) | |
2236 | { | |
2237 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2238 | ||
2239 | isp->security = NULL; | |
2240 | } | |
2241 | ||
ecfcc53f EB |
2242 | /** |
2243 | * smk_curacc_sem : check if current has access on sem | |
2244 | * @sma : the object | |
2245 | * @access : access requested | |
2246 | * | |
2247 | * Returns 0 if current has the requested access, error code otherwise | |
2248 | */ | |
2249 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2250 | { | |
2251 | char *ssp = smack_of_sem(sma); | |
2252 | struct smk_audit_info ad; | |
2253 | ||
2254 | #ifdef CONFIG_AUDIT | |
2255 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2256 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2257 | #endif | |
2258 | return smk_curacc(ssp, access, &ad); | |
2259 | } | |
2260 | ||
e114e473 CS |
2261 | /** |
2262 | * smack_sem_associate - Smack access check for sem | |
2263 | * @sma: the object | |
2264 | * @semflg: access requested | |
2265 | * | |
2266 | * Returns 0 if current has the requested access, error code otherwise | |
2267 | */ | |
2268 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2269 | { | |
e114e473 CS |
2270 | int may; |
2271 | ||
2272 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2273 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2274 | } |
2275 | ||
2276 | /** | |
2277 | * smack_sem_shmctl - Smack access check for sem | |
2278 | * @sma: the object | |
2279 | * @cmd: what it wants to do | |
2280 | * | |
2281 | * Returns 0 if current has the requested access, error code otherwise | |
2282 | */ | |
2283 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2284 | { | |
e114e473 CS |
2285 | int may; |
2286 | ||
2287 | switch (cmd) { | |
2288 | case GETPID: | |
2289 | case GETNCNT: | |
2290 | case GETZCNT: | |
2291 | case GETVAL: | |
2292 | case GETALL: | |
2293 | case IPC_STAT: | |
2294 | case SEM_STAT: | |
2295 | may = MAY_READ; | |
2296 | break; | |
2297 | case SETVAL: | |
2298 | case SETALL: | |
2299 | case IPC_RMID: | |
2300 | case IPC_SET: | |
2301 | may = MAY_READWRITE; | |
2302 | break; | |
2303 | case IPC_INFO: | |
2304 | case SEM_INFO: | |
2305 | /* | |
2306 | * System level information | |
2307 | */ | |
2308 | return 0; | |
2309 | default: | |
2310 | return -EINVAL; | |
2311 | } | |
2312 | ||
ecfcc53f | 2313 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2314 | } |
2315 | ||
2316 | /** | |
2317 | * smack_sem_semop - Smack checks of semaphore operations | |
2318 | * @sma: the object | |
2319 | * @sops: unused | |
2320 | * @nsops: unused | |
2321 | * @alter: unused | |
2322 | * | |
2323 | * Treated as read and write in all cases. | |
2324 | * | |
2325 | * Returns 0 if access is allowed, error code otherwise | |
2326 | */ | |
2327 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2328 | unsigned nsops, int alter) | |
2329 | { | |
ecfcc53f | 2330 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2331 | } |
2332 | ||
2333 | /** | |
2334 | * smack_msg_alloc_security - Set the security blob for msg | |
2335 | * @msq: the object | |
2336 | * | |
2337 | * Returns 0 | |
2338 | */ | |
2339 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2340 | { | |
2341 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2342 | ||
676dac4b | 2343 | kisp->security = smk_of_current(); |
e114e473 CS |
2344 | return 0; |
2345 | } | |
2346 | ||
2347 | /** | |
2348 | * smack_msg_free_security - Clear the security blob for msg | |
2349 | * @msq: the object | |
2350 | * | |
2351 | * Clears the blob pointer | |
2352 | */ | |
2353 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2354 | { | |
2355 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2356 | ||
2357 | kisp->security = NULL; | |
2358 | } | |
2359 | ||
2360 | /** | |
2361 | * smack_of_msq - the smack pointer for the msq | |
2362 | * @msq: the object | |
2363 | * | |
2364 | * Returns a pointer to the smack value | |
2365 | */ | |
2366 | static char *smack_of_msq(struct msg_queue *msq) | |
2367 | { | |
2368 | return (char *)msq->q_perm.security; | |
2369 | } | |
2370 | ||
ecfcc53f EB |
2371 | /** |
2372 | * smk_curacc_msq : helper to check if current has access on msq | |
2373 | * @msq : the msq | |
2374 | * @access : access requested | |
2375 | * | |
2376 | * return 0 if current has access, error otherwise | |
2377 | */ | |
2378 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2379 | { | |
2380 | char *msp = smack_of_msq(msq); | |
2381 | struct smk_audit_info ad; | |
2382 | ||
2383 | #ifdef CONFIG_AUDIT | |
2384 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2385 | ad.a.u.ipc_id = msq->q_perm.id; | |
2386 | #endif | |
2387 | return smk_curacc(msp, access, &ad); | |
2388 | } | |
2389 | ||
e114e473 CS |
2390 | /** |
2391 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2392 | * @msq: the object | |
2393 | * @msqflg: access requested | |
2394 | * | |
2395 | * Returns 0 if current has the requested access, error code otherwise | |
2396 | */ | |
2397 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2398 | { | |
e114e473 CS |
2399 | int may; |
2400 | ||
2401 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2402 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2403 | } |
2404 | ||
2405 | /** | |
2406 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2407 | * @msq: the object | |
2408 | * @cmd: what it wants to do | |
2409 | * | |
2410 | * Returns 0 if current has the requested access, error code otherwise | |
2411 | */ | |
2412 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2413 | { | |
e114e473 CS |
2414 | int may; |
2415 | ||
2416 | switch (cmd) { | |
2417 | case IPC_STAT: | |
2418 | case MSG_STAT: | |
2419 | may = MAY_READ; | |
2420 | break; | |
2421 | case IPC_SET: | |
2422 | case IPC_RMID: | |
2423 | may = MAY_READWRITE; | |
2424 | break; | |
2425 | case IPC_INFO: | |
2426 | case MSG_INFO: | |
2427 | /* | |
2428 | * System level information | |
2429 | */ | |
2430 | return 0; | |
2431 | default: | |
2432 | return -EINVAL; | |
2433 | } | |
2434 | ||
ecfcc53f | 2435 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2436 | } |
2437 | ||
2438 | /** | |
2439 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2440 | * @msq: the object | |
2441 | * @msg: unused | |
2442 | * @msqflg: access requested | |
2443 | * | |
2444 | * Returns 0 if current has the requested access, error code otherwise | |
2445 | */ | |
2446 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2447 | int msqflg) | |
2448 | { | |
ecfcc53f | 2449 | int may; |
e114e473 | 2450 | |
ecfcc53f EB |
2451 | may = smack_flags_to_may(msqflg); |
2452 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2453 | } |
2454 | ||
2455 | /** | |
2456 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2457 | * @msq: the object | |
2458 | * @msg: unused | |
2459 | * @target: unused | |
2460 | * @type: unused | |
2461 | * @mode: unused | |
2462 | * | |
2463 | * Returns 0 if current has read and write access, error code otherwise | |
2464 | */ | |
2465 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2466 | struct task_struct *target, long type, int mode) | |
2467 | { | |
ecfcc53f | 2468 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2469 | } |
2470 | ||
2471 | /** | |
2472 | * smack_ipc_permission - Smack access for ipc_permission() | |
2473 | * @ipp: the object permissions | |
2474 | * @flag: access requested | |
2475 | * | |
2476 | * Returns 0 if current has read and write access, error code otherwise | |
2477 | */ | |
2478 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2479 | { | |
2480 | char *isp = ipp->security; | |
ecfcc53f EB |
2481 | int may = smack_flags_to_may(flag); |
2482 | struct smk_audit_info ad; | |
e114e473 | 2483 | |
ecfcc53f EB |
2484 | #ifdef CONFIG_AUDIT |
2485 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2486 | ad.a.u.ipc_id = ipp->id; | |
2487 | #endif | |
2488 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2489 | } |
2490 | ||
d20bdda6 AD |
2491 | /** |
2492 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2493 | * @ipp: the object permissions |
d20bdda6 AD |
2494 | * @secid: where result will be saved |
2495 | */ | |
2496 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2497 | { | |
2498 | char *smack = ipp->security; | |
2499 | ||
2500 | *secid = smack_to_secid(smack); | |
2501 | } | |
2502 | ||
e114e473 CS |
2503 | /** |
2504 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2505 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2506 | * @inode: the object |
2507 | * | |
2508 | * Set the inode's security blob if it hasn't been done already. | |
2509 | */ | |
2510 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2511 | { | |
2512 | struct super_block *sbp; | |
2513 | struct superblock_smack *sbsp; | |
2514 | struct inode_smack *isp; | |
676dac4b | 2515 | char *csp = smk_of_current(); |
e114e473 CS |
2516 | char *fetched; |
2517 | char *final; | |
5c6d1125 JS |
2518 | char trattr[TRANS_TRUE_SIZE]; |
2519 | int transflag = 0; | |
e114e473 CS |
2520 | struct dentry *dp; |
2521 | ||
2522 | if (inode == NULL) | |
2523 | return; | |
2524 | ||
2525 | isp = inode->i_security; | |
2526 | ||
2527 | mutex_lock(&isp->smk_lock); | |
2528 | /* | |
2529 | * If the inode is already instantiated | |
2530 | * take the quick way out | |
2531 | */ | |
2532 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2533 | goto unlockandout; | |
2534 | ||
2535 | sbp = inode->i_sb; | |
2536 | sbsp = sbp->s_security; | |
2537 | /* | |
2538 | * We're going to use the superblock default label | |
2539 | * if there's no label on the file. | |
2540 | */ | |
2541 | final = sbsp->smk_default; | |
2542 | ||
e97dcb0e CS |
2543 | /* |
2544 | * If this is the root inode the superblock | |
2545 | * may be in the process of initialization. | |
2546 | * If that is the case use the root value out | |
2547 | * of the superblock. | |
2548 | */ | |
2549 | if (opt_dentry->d_parent == opt_dentry) { | |
2550 | isp->smk_inode = sbsp->smk_root; | |
2551 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2552 | goto unlockandout; | |
2553 | } | |
2554 | ||
e114e473 CS |
2555 | /* |
2556 | * This is pretty hackish. | |
2557 | * Casey says that we shouldn't have to do | |
2558 | * file system specific code, but it does help | |
2559 | * with keeping it simple. | |
2560 | */ | |
2561 | switch (sbp->s_magic) { | |
2562 | case SMACK_MAGIC: | |
2563 | /* | |
25985edc | 2564 | * Casey says that it's a little embarrassing |
e114e473 CS |
2565 | * that the smack file system doesn't do |
2566 | * extended attributes. | |
2567 | */ | |
2568 | final = smack_known_star.smk_known; | |
2569 | break; | |
2570 | case PIPEFS_MAGIC: | |
2571 | /* | |
2572 | * Casey says pipes are easy (?) | |
2573 | */ | |
2574 | final = smack_known_star.smk_known; | |
2575 | break; | |
2576 | case DEVPTS_SUPER_MAGIC: | |
2577 | /* | |
2578 | * devpts seems content with the label of the task. | |
2579 | * Programs that change smack have to treat the | |
2580 | * pty with respect. | |
2581 | */ | |
2582 | final = csp; | |
2583 | break; | |
2584 | case SOCKFS_MAGIC: | |
2585 | /* | |
b4e0d5f0 CS |
2586 | * Socket access is controlled by the socket |
2587 | * structures associated with the task involved. | |
e114e473 | 2588 | */ |
b4e0d5f0 | 2589 | final = smack_known_star.smk_known; |
e114e473 CS |
2590 | break; |
2591 | case PROC_SUPER_MAGIC: | |
2592 | /* | |
2593 | * Casey says procfs appears not to care. | |
2594 | * The superblock default suffices. | |
2595 | */ | |
2596 | break; | |
2597 | case TMPFS_MAGIC: | |
2598 | /* | |
2599 | * Device labels should come from the filesystem, | |
2600 | * but watch out, because they're volitile, | |
2601 | * getting recreated on every reboot. | |
2602 | */ | |
2603 | final = smack_known_star.smk_known; | |
2604 | /* | |
2605 | * No break. | |
2606 | * | |
2607 | * If a smack value has been set we want to use it, | |
2608 | * but since tmpfs isn't giving us the opportunity | |
2609 | * to set mount options simulate setting the | |
2610 | * superblock default. | |
2611 | */ | |
2612 | default: | |
2613 | /* | |
2614 | * This isn't an understood special case. | |
2615 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2616 | */ |
2617 | ||
2618 | /* | |
2619 | * UNIX domain sockets use lower level socket data. | |
2620 | */ | |
2621 | if (S_ISSOCK(inode->i_mode)) { | |
2622 | final = smack_known_star.smk_known; | |
2623 | break; | |
2624 | } | |
2625 | /* | |
e114e473 CS |
2626 | * No xattr support means, alas, no SMACK label. |
2627 | * Use the aforeapplied default. | |
2628 | * It would be curious if the label of the task | |
2629 | * does not match that assigned. | |
2630 | */ | |
2631 | if (inode->i_op->getxattr == NULL) | |
2632 | break; | |
2633 | /* | |
2634 | * Get the dentry for xattr. | |
2635 | */ | |
3e62cbb8 | 2636 | dp = dget(opt_dentry); |
676dac4b | 2637 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
5c6d1125 | 2638 | if (fetched != NULL) { |
e114e473 | 2639 | final = fetched; |
5c6d1125 JS |
2640 | if (S_ISDIR(inode->i_mode)) { |
2641 | trattr[0] = '\0'; | |
2642 | inode->i_op->getxattr(dp, | |
2643 | XATTR_NAME_SMACKTRANSMUTE, | |
2644 | trattr, TRANS_TRUE_SIZE); | |
2645 | if (strncmp(trattr, TRANS_TRUE, | |
2646 | TRANS_TRUE_SIZE) == 0) | |
2647 | transflag = SMK_INODE_TRANSMUTE; | |
2648 | } | |
2649 | } | |
2650 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2651 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2652 | |
e114e473 CS |
2653 | dput(dp); |
2654 | break; | |
2655 | } | |
2656 | ||
2657 | if (final == NULL) | |
2658 | isp->smk_inode = csp; | |
2659 | else | |
2660 | isp->smk_inode = final; | |
2661 | ||
5c6d1125 | 2662 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2663 | |
2664 | unlockandout: | |
2665 | mutex_unlock(&isp->smk_lock); | |
2666 | return; | |
2667 | } | |
2668 | ||
2669 | /** | |
2670 | * smack_getprocattr - Smack process attribute access | |
2671 | * @p: the object task | |
2672 | * @name: the name of the attribute in /proc/.../attr | |
2673 | * @value: where to put the result | |
2674 | * | |
2675 | * Places a copy of the task Smack into value | |
2676 | * | |
2677 | * Returns the length of the smack label or an error code | |
2678 | */ | |
2679 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2680 | { | |
2681 | char *cp; | |
2682 | int slen; | |
2683 | ||
2684 | if (strcmp(name, "current") != 0) | |
2685 | return -EINVAL; | |
2686 | ||
676dac4b | 2687 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2688 | if (cp == NULL) |
2689 | return -ENOMEM; | |
2690 | ||
2691 | slen = strlen(cp); | |
2692 | *value = cp; | |
2693 | return slen; | |
2694 | } | |
2695 | ||
2696 | /** | |
2697 | * smack_setprocattr - Smack process attribute setting | |
2698 | * @p: the object task | |
2699 | * @name: the name of the attribute in /proc/.../attr | |
2700 | * @value: the value to set | |
2701 | * @size: the size of the value | |
2702 | * | |
2703 | * Sets the Smack value of the task. Only setting self | |
2704 | * is permitted and only with privilege | |
2705 | * | |
2706 | * Returns the length of the smack label or an error code | |
2707 | */ | |
2708 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2709 | void *value, size_t size) | |
2710 | { | |
7898e1f8 | 2711 | int rc; |
676dac4b | 2712 | struct task_smack *tsp; |
5c6d1125 | 2713 | struct task_smack *oldtsp; |
d84f4f99 | 2714 | struct cred *new; |
e114e473 CS |
2715 | char *newsmack; |
2716 | ||
e114e473 CS |
2717 | /* |
2718 | * Changing another process' Smack value is too dangerous | |
2719 | * and supports no sane use case. | |
2720 | */ | |
2721 | if (p != current) | |
2722 | return -EPERM; | |
2723 | ||
5cd9c58f DH |
2724 | if (!capable(CAP_MAC_ADMIN)) |
2725 | return -EPERM; | |
2726 | ||
e114e473 CS |
2727 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2728 | return -EINVAL; | |
2729 | ||
2730 | if (strcmp(name, "current") != 0) | |
2731 | return -EINVAL; | |
2732 | ||
2733 | newsmack = smk_import(value, size); | |
2734 | if (newsmack == NULL) | |
2735 | return -EINVAL; | |
2736 | ||
6d3dc07c CS |
2737 | /* |
2738 | * No process is ever allowed the web ("@") label. | |
2739 | */ | |
2740 | if (newsmack == smack_known_web.smk_known) | |
2741 | return -EPERM; | |
2742 | ||
5c6d1125 | 2743 | oldtsp = p->cred->security; |
d84f4f99 | 2744 | new = prepare_creds(); |
6d3dc07c | 2745 | if (new == NULL) |
d84f4f99 | 2746 | return -ENOMEM; |
7898e1f8 CS |
2747 | |
2748 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2749 | if (tsp == NULL) { |
2750 | kfree(new); | |
2751 | return -ENOMEM; | |
2752 | } | |
7898e1f8 CS |
2753 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2754 | if (rc != 0) | |
2755 | return rc; | |
2756 | ||
676dac4b | 2757 | new->security = tsp; |
d84f4f99 | 2758 | commit_creds(new); |
e114e473 CS |
2759 | return size; |
2760 | } | |
2761 | ||
2762 | /** | |
2763 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2764 | * @sock: one sock |
2765 | * @other: the other sock | |
e114e473 CS |
2766 | * @newsk: unused |
2767 | * | |
2768 | * Return 0 if a subject with the smack of sock could access | |
2769 | * an object with the smack of other, otherwise an error code | |
2770 | */ | |
3610cda5 DM |
2771 | static int smack_unix_stream_connect(struct sock *sock, |
2772 | struct sock *other, struct sock *newsk) | |
e114e473 | 2773 | { |
d2e7ad19 JM |
2774 | struct socket_smack *ssp = sock->sk_security; |
2775 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2776 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2777 | struct smk_audit_info ad; |
b4e0d5f0 | 2778 | int rc = 0; |
e114e473 | 2779 | |
ecfcc53f | 2780 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
3610cda5 | 2781 | smk_ad_setfield_u_net_sk(&ad, other); |
b4e0d5f0 CS |
2782 | |
2783 | if (!capable(CAP_MAC_OVERRIDE)) | |
2784 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2785 | ||
975d5e55 CS |
2786 | /* |
2787 | * Cross reference the peer labels for SO_PEERSEC. | |
2788 | */ | |
2789 | if (rc == 0) { | |
2790 | nsp->smk_packet = ssp->smk_out; | |
2791 | ssp->smk_packet = osp->smk_out; | |
2792 | } | |
2793 | ||
b4e0d5f0 | 2794 | return rc; |
e114e473 CS |
2795 | } |
2796 | ||
2797 | /** | |
2798 | * smack_unix_may_send - Smack access on UDS | |
2799 | * @sock: one socket | |
2800 | * @other: the other socket | |
2801 | * | |
2802 | * Return 0 if a subject with the smack of sock could access | |
2803 | * an object with the smack of other, otherwise an error code | |
2804 | */ | |
2805 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2806 | { | |
b4e0d5f0 CS |
2807 | struct socket_smack *ssp = sock->sk->sk_security; |
2808 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2809 | struct smk_audit_info ad; |
b4e0d5f0 | 2810 | int rc = 0; |
e114e473 | 2811 | |
ecfcc53f EB |
2812 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2813 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2814 | |
2815 | if (!capable(CAP_MAC_OVERRIDE)) | |
2816 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2817 | ||
2818 | return rc; | |
e114e473 CS |
2819 | } |
2820 | ||
6d3dc07c CS |
2821 | /** |
2822 | * smack_socket_sendmsg - Smack check based on destination host | |
2823 | * @sock: the socket | |
251a2a95 | 2824 | * @msg: the message |
6d3dc07c CS |
2825 | * @size: the size of the message |
2826 | * | |
2827 | * Return 0 if the current subject can write to the destination | |
2828 | * host. This is only a question if the destination is a single | |
2829 | * label host. | |
2830 | */ | |
2831 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2832 | int size) | |
2833 | { | |
2834 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2835 | |
2836 | /* | |
2837 | * Perfectly reasonable for this to be NULL | |
2838 | */ | |
da34d424 | 2839 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2840 | return 0; |
2841 | ||
07feee8f | 2842 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2843 | } |
2844 | ||
e114e473 | 2845 | /** |
251a2a95 | 2846 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 2847 | * @sap: netlabel secattr |
272cd7a8 | 2848 | * @ssp: socket security information |
e114e473 | 2849 | * |
272cd7a8 | 2850 | * Returns a pointer to a Smack label found on the label list. |
e114e473 | 2851 | */ |
272cd7a8 CS |
2852 | static char *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
2853 | struct socket_smack *ssp) | |
e114e473 | 2854 | { |
272cd7a8 | 2855 | struct smack_known *skp; |
e114e473 | 2856 | char smack[SMK_LABELLEN]; |
6d3dc07c | 2857 | char *sp; |
e114e473 CS |
2858 | int pcat; |
2859 | ||
6d3dc07c | 2860 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2861 | /* |
6d3dc07c | 2862 | * Looks like a CIPSO packet. |
e114e473 CS |
2863 | * If there are flags but no level netlabel isn't |
2864 | * behaving the way we expect it to. | |
2865 | * | |
6d3dc07c | 2866 | * Get the categories, if any |
e114e473 CS |
2867 | * Without guidance regarding the smack value |
2868 | * for the packet fall back on the network | |
2869 | * ambient value. | |
2870 | */ | |
6d3dc07c CS |
2871 | memset(smack, '\0', SMK_LABELLEN); |
2872 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2873 | for (pcat = -1;;) { | |
2874 | pcat = netlbl_secattr_catmap_walk( | |
2875 | sap->attr.mls.cat, pcat + 1); | |
2876 | if (pcat < 0) | |
2877 | break; | |
2878 | smack_catset_bit(pcat, smack); | |
2879 | } | |
2880 | /* | |
2881 | * If it is CIPSO using smack direct mapping | |
2882 | * we are already done. WeeHee. | |
2883 | */ | |
2884 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
272cd7a8 CS |
2885 | /* |
2886 | * The label sent is usually on the label list. | |
2887 | * | |
2888 | * If it is not we may still want to allow the | |
2889 | * delivery. | |
2890 | * | |
2891 | * If the recipient is accepting all packets | |
2892 | * because it is using the star ("*") label | |
2893 | * for SMACK64IPIN provide the web ("@") label | |
2894 | * so that a directed response will succeed. | |
2895 | * This is not very correct from a MAC point | |
2896 | * of view, but gets around the problem that | |
2897 | * locking prevents adding the newly discovered | |
2898 | * label to the list. | |
2899 | * The case where the recipient is not using | |
2900 | * the star label should obviously fail. | |
2901 | * The easy way to do this is to provide the | |
2902 | * star label as the subject label. | |
2903 | */ | |
2904 | skp = smk_find_entry(smack); | |
2905 | if (skp != NULL) | |
2906 | return skp->smk_known; | |
2907 | if (ssp != NULL && | |
2908 | ssp->smk_in == smack_known_star.smk_known) | |
2909 | return smack_known_web.smk_known; | |
2910 | return smack_known_star.smk_known; | |
6d3dc07c CS |
2911 | } |
2912 | /* | |
2913 | * Look it up in the supplied table if it is not | |
2914 | * a direct mapping. | |
2915 | */ | |
272cd7a8 CS |
2916 | sp = smack_from_cipso(sap->attr.mls.lvl, smack); |
2917 | if (sp != NULL) | |
2918 | return sp; | |
2919 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) | |
2920 | return smack_known_web.smk_known; | |
2921 | return smack_known_star.smk_known; | |
e114e473 | 2922 | } |
6d3dc07c CS |
2923 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2924 | /* | |
2925 | * Looks like a fallback, which gives us a secid. | |
2926 | */ | |
2927 | sp = smack_from_secid(sap->attr.secid); | |
2928 | /* | |
2929 | * This has got to be a bug because it is | |
2930 | * impossible to specify a fallback without | |
2931 | * specifying the label, which will ensure | |
2932 | * it has a secid, and the only way to get a | |
2933 | * secid is from a fallback. | |
2934 | */ | |
2935 | BUG_ON(sp == NULL); | |
272cd7a8 | 2936 | return sp; |
e114e473 CS |
2937 | } |
2938 | /* | |
6d3dc07c CS |
2939 | * Without guidance regarding the smack value |
2940 | * for the packet fall back on the network | |
2941 | * ambient value. | |
e114e473 | 2942 | */ |
272cd7a8 | 2943 | return smack_net_ambient; |
e114e473 CS |
2944 | } |
2945 | ||
2946 | /** | |
2947 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2948 | * @sk: socket | |
2949 | * @skb: packet | |
2950 | * | |
2951 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2952 | */ | |
2953 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2954 | { | |
2955 | struct netlbl_lsm_secattr secattr; | |
2956 | struct socket_smack *ssp = sk->sk_security; | |
6d3dc07c | 2957 | char *csp; |
e114e473 | 2958 | int rc; |
ecfcc53f | 2959 | struct smk_audit_info ad; |
e114e473 CS |
2960 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2961 | return 0; | |
2962 | ||
2963 | /* | |
2964 | * Translate what netlabel gave us. | |
2965 | */ | |
e114e473 | 2966 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2967 | |
e114e473 | 2968 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
272cd7a8 CS |
2969 | if (rc == 0) |
2970 | csp = smack_from_secattr(&secattr, ssp); | |
2971 | else | |
6d3dc07c CS |
2972 | csp = smack_net_ambient; |
2973 | ||
e114e473 | 2974 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2975 | |
ecfcc53f EB |
2976 | #ifdef CONFIG_AUDIT |
2977 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2978 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 2979 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2980 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2981 | #endif | |
e114e473 CS |
2982 | /* |
2983 | * Receiving a packet requires that the other end | |
2984 | * be able to write here. Read access is not required. | |
2985 | * This is the simplist possible security model | |
2986 | * for networking. | |
2987 | */ | |
ecfcc53f | 2988 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2989 | if (rc != 0) |
2990 | netlbl_skbuff_err(skb, rc, 0); | |
2991 | return rc; | |
e114e473 CS |
2992 | } |
2993 | ||
2994 | /** | |
2995 | * smack_socket_getpeersec_stream - pull in packet label | |
2996 | * @sock: the socket | |
2997 | * @optval: user's destination | |
2998 | * @optlen: size thereof | |
251a2a95 | 2999 | * @len: max thereof |
e114e473 CS |
3000 | * |
3001 | * returns zero on success, an error code otherwise | |
3002 | */ | |
3003 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3004 | char __user *optval, | |
3005 | int __user *optlen, unsigned len) | |
3006 | { | |
3007 | struct socket_smack *ssp; | |
272cd7a8 CS |
3008 | char *rcp = ""; |
3009 | int slen = 1; | |
e114e473 CS |
3010 | int rc = 0; |
3011 | ||
3012 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3013 | if (ssp->smk_packet != NULL) { |
3014 | rcp = ssp->smk_packet; | |
3015 | slen = strlen(rcp) + 1; | |
3016 | } | |
e114e473 CS |
3017 | |
3018 | if (slen > len) | |
3019 | rc = -ERANGE; | |
272cd7a8 | 3020 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3021 | rc = -EFAULT; |
3022 | ||
3023 | if (put_user(slen, optlen) != 0) | |
3024 | rc = -EFAULT; | |
3025 | ||
3026 | return rc; | |
3027 | } | |
3028 | ||
3029 | ||
3030 | /** | |
3031 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3032 | * @sock: the peer socket |
e114e473 CS |
3033 | * @skb: packet data |
3034 | * @secid: pointer to where to put the secid of the packet | |
3035 | * | |
3036 | * Sets the netlabel socket state on sk from parent | |
3037 | */ | |
3038 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3039 | struct sk_buff *skb, u32 *secid) | |
3040 | ||
3041 | { | |
3042 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 CS |
3043 | struct socket_smack *ssp = NULL; |
3044 | char *sp; | |
b4e0d5f0 CS |
3045 | int family = PF_UNSPEC; |
3046 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3047 | int rc; |
3048 | ||
b4e0d5f0 CS |
3049 | if (skb != NULL) { |
3050 | if (skb->protocol == htons(ETH_P_IP)) | |
3051 | family = PF_INET; | |
3052 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3053 | family = PF_INET6; | |
e114e473 | 3054 | } |
b4e0d5f0 CS |
3055 | if (family == PF_UNSPEC && sock != NULL) |
3056 | family = sock->sk->sk_family; | |
e114e473 | 3057 | |
b4e0d5f0 | 3058 | if (family == PF_UNIX) { |
272cd7a8 CS |
3059 | ssp = sock->sk->sk_security; |
3060 | s = smack_to_secid(ssp->smk_out); | |
b4e0d5f0 CS |
3061 | } else if (family == PF_INET || family == PF_INET6) { |
3062 | /* | |
3063 | * Translate what netlabel gave us. | |
3064 | */ | |
272cd7a8 CS |
3065 | if (sock != NULL && sock->sk != NULL) |
3066 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3067 | netlbl_secattr_init(&secattr); |
3068 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3069 | if (rc == 0) { | |
272cd7a8 CS |
3070 | sp = smack_from_secattr(&secattr, ssp); |
3071 | s = smack_to_secid(sp); | |
b4e0d5f0 CS |
3072 | } |
3073 | netlbl_secattr_destroy(&secattr); | |
3074 | } | |
3075 | *secid = s; | |
e114e473 CS |
3076 | if (s == 0) |
3077 | return -EINVAL; | |
e114e473 CS |
3078 | return 0; |
3079 | } | |
3080 | ||
3081 | /** | |
07feee8f PM |
3082 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3083 | * @sk: child sock | |
3084 | * @parent: parent socket | |
e114e473 | 3085 | * |
07feee8f PM |
3086 | * Set the smk_{in,out} state of an existing sock based on the process that |
3087 | * is creating the new socket. | |
e114e473 CS |
3088 | */ |
3089 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3090 | { | |
3091 | struct socket_smack *ssp; | |
e114e473 | 3092 | |
07feee8f PM |
3093 | if (sk == NULL || |
3094 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3095 | return; |
3096 | ||
3097 | ssp = sk->sk_security; | |
676dac4b | 3098 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3099 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3100 | } |
3101 | ||
3102 | /** | |
3103 | * smack_inet_conn_request - Smack access check on connect | |
3104 | * @sk: socket involved | |
3105 | * @skb: packet | |
3106 | * @req: unused | |
3107 | * | |
3108 | * Returns 0 if a task with the packet label could write to | |
3109 | * the socket, otherwise an error code | |
3110 | */ | |
3111 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3112 | struct request_sock *req) | |
3113 | { | |
07feee8f | 3114 | u16 family = sk->sk_family; |
e114e473 | 3115 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3116 | struct netlbl_lsm_secattr secattr; |
3117 | struct sockaddr_in addr; | |
3118 | struct iphdr *hdr; | |
272cd7a8 | 3119 | char *sp; |
e114e473 | 3120 | int rc; |
ecfcc53f | 3121 | struct smk_audit_info ad; |
e114e473 | 3122 | |
07feee8f PM |
3123 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3124 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3125 | family = PF_INET; | |
e114e473 | 3126 | |
07feee8f PM |
3127 | netlbl_secattr_init(&secattr); |
3128 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3129 | if (rc == 0) |
272cd7a8 | 3130 | sp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3131 | else |
272cd7a8 | 3132 | sp = smack_known_huh.smk_known; |
07feee8f PM |
3133 | netlbl_secattr_destroy(&secattr); |
3134 | ||
ecfcc53f EB |
3135 | #ifdef CONFIG_AUDIT |
3136 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3137 | ad.a.u.net.family = family; | |
8964be4a | 3138 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3139 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3140 | #endif | |
e114e473 | 3141 | /* |
07feee8f PM |
3142 | * Receiving a packet requires that the other end be able to write |
3143 | * here. Read access is not required. | |
e114e473 | 3144 | */ |
272cd7a8 | 3145 | rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3146 | if (rc != 0) |
3147 | return rc; | |
3148 | ||
3149 | /* | |
3150 | * Save the peer's label in the request_sock so we can later setup | |
3151 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3152 | */ | |
272cd7a8 | 3153 | req->peer_secid = smack_to_secid(sp); |
07feee8f PM |
3154 | |
3155 | /* | |
3156 | * We need to decide if we want to label the incoming connection here | |
3157 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3158 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3159 | */ |
3160 | hdr = ip_hdr(skb); | |
3161 | addr.sin_addr.s_addr = hdr->saddr; | |
3162 | rcu_read_lock(); | |
3163 | if (smack_host_label(&addr) == NULL) { | |
3164 | rcu_read_unlock(); | |
3165 | netlbl_secattr_init(&secattr); | |
272cd7a8 | 3166 | smack_to_secattr(sp, &secattr); |
07feee8f PM |
3167 | rc = netlbl_req_setattr(req, &secattr); |
3168 | netlbl_secattr_destroy(&secattr); | |
3169 | } else { | |
3170 | rcu_read_unlock(); | |
3171 | netlbl_req_delattr(req); | |
3172 | } | |
e114e473 CS |
3173 | |
3174 | return rc; | |
3175 | } | |
3176 | ||
07feee8f PM |
3177 | /** |
3178 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3179 | * @sk: the new socket | |
3180 | * @req: the connection's request_sock | |
3181 | * | |
3182 | * Transfer the connection's peer label to the newly created socket. | |
3183 | */ | |
3184 | static void smack_inet_csk_clone(struct sock *sk, | |
3185 | const struct request_sock *req) | |
3186 | { | |
3187 | struct socket_smack *ssp = sk->sk_security; | |
07feee8f | 3188 | |
272cd7a8 CS |
3189 | if (req->peer_secid != 0) |
3190 | ssp->smk_packet = smack_from_secid(req->peer_secid); | |
3191 | else | |
3192 | ssp->smk_packet = NULL; | |
07feee8f PM |
3193 | } |
3194 | ||
e114e473 CS |
3195 | /* |
3196 | * Key management security hooks | |
3197 | * | |
3198 | * Casey has not tested key support very heavily. | |
3199 | * The permission check is most likely too restrictive. | |
3200 | * If you care about keys please have a look. | |
3201 | */ | |
3202 | #ifdef CONFIG_KEYS | |
3203 | ||
3204 | /** | |
3205 | * smack_key_alloc - Set the key security blob | |
3206 | * @key: object | |
d84f4f99 | 3207 | * @cred: the credentials to use |
e114e473 CS |
3208 | * @flags: unused |
3209 | * | |
3210 | * No allocation required | |
3211 | * | |
3212 | * Returns 0 | |
3213 | */ | |
d84f4f99 | 3214 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3215 | unsigned long flags) |
3216 | { | |
676dac4b | 3217 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3218 | return 0; |
3219 | } | |
3220 | ||
3221 | /** | |
3222 | * smack_key_free - Clear the key security blob | |
3223 | * @key: the object | |
3224 | * | |
3225 | * Clear the blob pointer | |
3226 | */ | |
3227 | static void smack_key_free(struct key *key) | |
3228 | { | |
3229 | key->security = NULL; | |
3230 | } | |
3231 | ||
3232 | /* | |
3233 | * smack_key_permission - Smack access on a key | |
3234 | * @key_ref: gets to the object | |
d84f4f99 | 3235 | * @cred: the credentials to use |
e114e473 CS |
3236 | * @perm: unused |
3237 | * | |
3238 | * Return 0 if the task has read and write to the object, | |
3239 | * an error code otherwise | |
3240 | */ | |
3241 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3242 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3243 | { |
3244 | struct key *keyp; | |
ecfcc53f | 3245 | struct smk_audit_info ad; |
676dac4b | 3246 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3247 | |
3248 | keyp = key_ref_to_ptr(key_ref); | |
3249 | if (keyp == NULL) | |
3250 | return -EINVAL; | |
3251 | /* | |
3252 | * If the key hasn't been initialized give it access so that | |
3253 | * it may do so. | |
3254 | */ | |
3255 | if (keyp->security == NULL) | |
3256 | return 0; | |
3257 | /* | |
3258 | * This should not occur | |
3259 | */ | |
676dac4b | 3260 | if (tsp == NULL) |
e114e473 | 3261 | return -EACCES; |
ecfcc53f EB |
3262 | #ifdef CONFIG_AUDIT |
3263 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3264 | ad.a.u.key_struct.key = keyp->serial; | |
3265 | ad.a.u.key_struct.key_desc = keyp->description; | |
3266 | #endif | |
676dac4b | 3267 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3268 | MAY_READWRITE, &ad); |
e114e473 CS |
3269 | } |
3270 | #endif /* CONFIG_KEYS */ | |
3271 | ||
d20bdda6 AD |
3272 | /* |
3273 | * Smack Audit hooks | |
3274 | * | |
3275 | * Audit requires a unique representation of each Smack specific | |
3276 | * rule. This unique representation is used to distinguish the | |
3277 | * object to be audited from remaining kernel objects and also | |
3278 | * works as a glue between the audit hooks. | |
3279 | * | |
3280 | * Since repository entries are added but never deleted, we'll use | |
3281 | * the smack_known label address related to the given audit rule as | |
3282 | * the needed unique representation. This also better fits the smack | |
3283 | * model where nearly everything is a label. | |
3284 | */ | |
3285 | #ifdef CONFIG_AUDIT | |
3286 | ||
3287 | /** | |
3288 | * smack_audit_rule_init - Initialize a smack audit rule | |
3289 | * @field: audit rule fields given from user-space (audit.h) | |
3290 | * @op: required testing operator (=, !=, >, <, ...) | |
3291 | * @rulestr: smack label to be audited | |
3292 | * @vrule: pointer to save our own audit rule representation | |
3293 | * | |
3294 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3295 | * The label to be audited is created if necessay. | |
3296 | */ | |
3297 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3298 | { | |
3299 | char **rule = (char **)vrule; | |
3300 | *rule = NULL; | |
3301 | ||
3302 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3303 | return -EINVAL; | |
3304 | ||
5af75d8d | 3305 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3306 | return -EINVAL; |
3307 | ||
3308 | *rule = smk_import(rulestr, 0); | |
3309 | ||
3310 | return 0; | |
3311 | } | |
3312 | ||
3313 | /** | |
3314 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3315 | * @krule: rule of interest, in Audit kernel representation format | |
3316 | * | |
3317 | * This is used to filter Smack rules from remaining Audit ones. | |
3318 | * If it's proved that this rule belongs to us, the | |
3319 | * audit_rule_match hook will be called to do the final judgement. | |
3320 | */ | |
3321 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3322 | { | |
3323 | struct audit_field *f; | |
3324 | int i; | |
3325 | ||
3326 | for (i = 0; i < krule->field_count; i++) { | |
3327 | f = &krule->fields[i]; | |
3328 | ||
3329 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3330 | return 1; | |
3331 | } | |
3332 | ||
3333 | return 0; | |
3334 | } | |
3335 | ||
3336 | /** | |
3337 | * smack_audit_rule_match - Audit given object ? | |
3338 | * @secid: security id for identifying the object to test | |
3339 | * @field: audit rule flags given from user-space | |
3340 | * @op: required testing operator | |
3341 | * @vrule: smack internal rule presentation | |
3342 | * @actx: audit context associated with the check | |
3343 | * | |
3344 | * The core Audit hook. It's used to take the decision of | |
3345 | * whether to audit or not to audit a given object. | |
3346 | */ | |
3347 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3348 | struct audit_context *actx) | |
3349 | { | |
3350 | char *smack; | |
3351 | char *rule = vrule; | |
3352 | ||
3353 | if (!rule) { | |
3354 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
3355 | "Smack: missing rule\n"); | |
3356 | return -ENOENT; | |
3357 | } | |
3358 | ||
3359 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3360 | return 0; | |
3361 | ||
3362 | smack = smack_from_secid(secid); | |
3363 | ||
3364 | /* | |
3365 | * No need to do string comparisons. If a match occurs, | |
3366 | * both pointers will point to the same smack_known | |
3367 | * label. | |
3368 | */ | |
5af75d8d | 3369 | if (op == Audit_equal) |
d20bdda6 | 3370 | return (rule == smack); |
5af75d8d | 3371 | if (op == Audit_not_equal) |
d20bdda6 AD |
3372 | return (rule != smack); |
3373 | ||
3374 | return 0; | |
3375 | } | |
3376 | ||
3377 | /** | |
3378 | * smack_audit_rule_free - free smack rule representation | |
3379 | * @vrule: rule to be freed. | |
3380 | * | |
3381 | * No memory was allocated. | |
3382 | */ | |
3383 | static void smack_audit_rule_free(void *vrule) | |
3384 | { | |
3385 | /* No-op */ | |
3386 | } | |
3387 | ||
3388 | #endif /* CONFIG_AUDIT */ | |
3389 | ||
251a2a95 | 3390 | /** |
e114e473 CS |
3391 | * smack_secid_to_secctx - return the smack label for a secid |
3392 | * @secid: incoming integer | |
3393 | * @secdata: destination | |
3394 | * @seclen: how long it is | |
3395 | * | |
3396 | * Exists for networking code. | |
3397 | */ | |
3398 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3399 | { | |
3400 | char *sp = smack_from_secid(secid); | |
3401 | ||
d5630b9d EP |
3402 | if (secdata) |
3403 | *secdata = sp; | |
e114e473 CS |
3404 | *seclen = strlen(sp); |
3405 | return 0; | |
3406 | } | |
3407 | ||
251a2a95 | 3408 | /** |
4bc87e62 CS |
3409 | * smack_secctx_to_secid - return the secid for a smack label |
3410 | * @secdata: smack label | |
3411 | * @seclen: how long result is | |
3412 | * @secid: outgoing integer | |
3413 | * | |
3414 | * Exists for audit and networking code. | |
3415 | */ | |
e52c1764 | 3416 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3417 | { |
3418 | *secid = smack_to_secid(secdata); | |
3419 | return 0; | |
3420 | } | |
3421 | ||
251a2a95 | 3422 | /** |
e114e473 | 3423 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3424 | * @secdata: unused |
3425 | * @seclen: unused | |
e114e473 CS |
3426 | * |
3427 | * Exists to make sure nothing gets done, and properly | |
3428 | */ | |
3429 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3430 | { | |
3431 | } | |
3432 | ||
1ee65e37 DQ |
3433 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3434 | { | |
3435 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3436 | } | |
3437 | ||
3438 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3439 | { | |
3440 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3441 | } | |
3442 | ||
3443 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3444 | { | |
3445 | int len = 0; | |
3446 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3447 | ||
3448 | if (len < 0) | |
3449 | return len; | |
3450 | *ctxlen = len; | |
3451 | return 0; | |
3452 | } | |
3453 | ||
076c54c5 AD |
3454 | struct security_operations smack_ops = { |
3455 | .name = "smack", | |
3456 | ||
9e48858f | 3457 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3458 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3459 | .syslog = smack_syslog, |
e114e473 CS |
3460 | |
3461 | .sb_alloc_security = smack_sb_alloc_security, | |
3462 | .sb_free_security = smack_sb_free_security, | |
3463 | .sb_copy_data = smack_sb_copy_data, | |
3464 | .sb_kern_mount = smack_sb_kern_mount, | |
3465 | .sb_statfs = smack_sb_statfs, | |
3466 | .sb_mount = smack_sb_mount, | |
3467 | .sb_umount = smack_sb_umount, | |
3468 | ||
676dac4b CS |
3469 | .bprm_set_creds = smack_bprm_set_creds, |
3470 | ||
e114e473 CS |
3471 | .inode_alloc_security = smack_inode_alloc_security, |
3472 | .inode_free_security = smack_inode_free_security, | |
3473 | .inode_init_security = smack_inode_init_security, | |
3474 | .inode_link = smack_inode_link, | |
3475 | .inode_unlink = smack_inode_unlink, | |
3476 | .inode_rmdir = smack_inode_rmdir, | |
3477 | .inode_rename = smack_inode_rename, | |
3478 | .inode_permission = smack_inode_permission, | |
3479 | .inode_setattr = smack_inode_setattr, | |
3480 | .inode_getattr = smack_inode_getattr, | |
3481 | .inode_setxattr = smack_inode_setxattr, | |
3482 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3483 | .inode_getxattr = smack_inode_getxattr, | |
3484 | .inode_removexattr = smack_inode_removexattr, | |
3485 | .inode_getsecurity = smack_inode_getsecurity, | |
3486 | .inode_setsecurity = smack_inode_setsecurity, | |
3487 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3488 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3489 | |
3490 | .file_permission = smack_file_permission, | |
3491 | .file_alloc_security = smack_file_alloc_security, | |
3492 | .file_free_security = smack_file_free_security, | |
3493 | .file_ioctl = smack_file_ioctl, | |
3494 | .file_lock = smack_file_lock, | |
3495 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3496 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3497 | .file_set_fowner = smack_file_set_fowner, |
3498 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3499 | .file_receive = smack_file_receive, | |
3500 | ||
531f1d45 CS |
3501 | .dentry_open = smack_dentry_open, |
3502 | ||
ee18d64c | 3503 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3504 | .cred_free = smack_cred_free, |
d84f4f99 | 3505 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3506 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3507 | .kernel_act_as = smack_kernel_act_as, |
3508 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3509 | .task_setpgid = smack_task_setpgid, |
3510 | .task_getpgid = smack_task_getpgid, | |
3511 | .task_getsid = smack_task_getsid, | |
3512 | .task_getsecid = smack_task_getsecid, | |
3513 | .task_setnice = smack_task_setnice, | |
3514 | .task_setioprio = smack_task_setioprio, | |
3515 | .task_getioprio = smack_task_getioprio, | |
3516 | .task_setscheduler = smack_task_setscheduler, | |
3517 | .task_getscheduler = smack_task_getscheduler, | |
3518 | .task_movememory = smack_task_movememory, | |
3519 | .task_kill = smack_task_kill, | |
3520 | .task_wait = smack_task_wait, | |
e114e473 CS |
3521 | .task_to_inode = smack_task_to_inode, |
3522 | ||
3523 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3524 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3525 | |
3526 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3527 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3528 | ||
3529 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3530 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3531 | .msg_queue_associate = smack_msg_queue_associate, | |
3532 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3533 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3534 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3535 | ||
3536 | .shm_alloc_security = smack_shm_alloc_security, | |
3537 | .shm_free_security = smack_shm_free_security, | |
3538 | .shm_associate = smack_shm_associate, | |
3539 | .shm_shmctl = smack_shm_shmctl, | |
3540 | .shm_shmat = smack_shm_shmat, | |
3541 | ||
3542 | .sem_alloc_security = smack_sem_alloc_security, | |
3543 | .sem_free_security = smack_sem_free_security, | |
3544 | .sem_associate = smack_sem_associate, | |
3545 | .sem_semctl = smack_sem_semctl, | |
3546 | .sem_semop = smack_sem_semop, | |
3547 | ||
e114e473 CS |
3548 | .d_instantiate = smack_d_instantiate, |
3549 | ||
3550 | .getprocattr = smack_getprocattr, | |
3551 | .setprocattr = smack_setprocattr, | |
3552 | ||
3553 | .unix_stream_connect = smack_unix_stream_connect, | |
3554 | .unix_may_send = smack_unix_may_send, | |
3555 | ||
3556 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3557 | .socket_connect = smack_socket_connect, |
3558 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3559 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3560 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3561 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3562 | .sk_alloc_security = smack_sk_alloc_security, | |
3563 | .sk_free_security = smack_sk_free_security, | |
3564 | .sock_graft = smack_sock_graft, | |
3565 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3566 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3567 | |
e114e473 CS |
3568 | /* key management security hooks */ |
3569 | #ifdef CONFIG_KEYS | |
3570 | .key_alloc = smack_key_alloc, | |
3571 | .key_free = smack_key_free, | |
3572 | .key_permission = smack_key_permission, | |
3573 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3574 | |
3575 | /* Audit hooks */ | |
3576 | #ifdef CONFIG_AUDIT | |
3577 | .audit_rule_init = smack_audit_rule_init, | |
3578 | .audit_rule_known = smack_audit_rule_known, | |
3579 | .audit_rule_match = smack_audit_rule_match, | |
3580 | .audit_rule_free = smack_audit_rule_free, | |
3581 | #endif /* CONFIG_AUDIT */ | |
3582 | ||
e114e473 | 3583 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3584 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3585 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3586 | .inode_notifysecctx = smack_inode_notifysecctx, |
3587 | .inode_setsecctx = smack_inode_setsecctx, | |
3588 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3589 | }; |
3590 | ||
7198e2ee EB |
3591 | |
3592 | static __init void init_smack_know_list(void) | |
3593 | { | |
3594 | list_add(&smack_known_huh.list, &smack_known_list); | |
3595 | list_add(&smack_known_hat.list, &smack_known_list); | |
3596 | list_add(&smack_known_star.list, &smack_known_list); | |
3597 | list_add(&smack_known_floor.list, &smack_known_list); | |
3598 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3599 | list_add(&smack_known_web.list, &smack_known_list); | |
3600 | } | |
3601 | ||
e114e473 CS |
3602 | /** |
3603 | * smack_init - initialize the smack system | |
3604 | * | |
3605 | * Returns 0 | |
3606 | */ | |
3607 | static __init int smack_init(void) | |
3608 | { | |
d84f4f99 | 3609 | struct cred *cred; |
676dac4b | 3610 | struct task_smack *tsp; |
d84f4f99 | 3611 | |
7898e1f8 CS |
3612 | if (!security_module_enable(&smack_ops)) |
3613 | return 0; | |
3614 | ||
3615 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3616 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3617 | if (tsp == NULL) |
3618 | return -ENOMEM; | |
3619 | ||
e114e473 CS |
3620 | printk(KERN_INFO "Smack: Initializing.\n"); |
3621 | ||
3622 | /* | |
3623 | * Set the security state for the initial task. | |
3624 | */ | |
d84f4f99 | 3625 | cred = (struct cred *) current->cred; |
676dac4b | 3626 | cred->security = tsp; |
e114e473 | 3627 | |
421f91d2 | 3628 | /* initialize the smack_know_list */ |
7198e2ee | 3629 | init_smack_know_list(); |
e114e473 CS |
3630 | /* |
3631 | * Initialize locks | |
3632 | */ | |
e114e473 CS |
3633 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3634 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3635 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3636 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3637 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3638 | ||
3639 | /* | |
3640 | * Register with LSM | |
3641 | */ | |
3642 | if (register_security(&smack_ops)) | |
3643 | panic("smack: Unable to register with kernel.\n"); | |
3644 | ||
3645 | return 0; | |
3646 | } | |
3647 | ||
3648 | /* | |
3649 | * Smack requires early initialization in order to label | |
3650 | * all processes and objects when they are created. | |
3651 | */ | |
3652 | security_initcall(smack_init); |