Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
e114e473 CS |
31 | #include <linux/mutex.h> |
32 | #include <linux/pipe_fs_i.h> | |
33 | #include <net/netlabel.h> | |
34 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 35 | #include <linux/audit.h> |
1fd7317d | 36 | #include <linux/magic.h> |
2a7dba39 | 37 | #include <linux/dcache.h> |
16014d87 | 38 | #include <linux/personality.h> |
40401530 AV |
39 | #include <linux/msg.h> |
40 | #include <linux/shm.h> | |
41 | #include <linux/binfmts.h> | |
e114e473 CS |
42 | #include "smack.h" |
43 | ||
c69e8d9c DH |
44 | #define task_security(task) (task_cred_xxx((task), security)) |
45 | ||
5c6d1125 JS |
46 | #define TRANS_TRUE "TRUE" |
47 | #define TRANS_TRUE_SIZE 4 | |
48 | ||
e114e473 CS |
49 | /** |
50 | * smk_fetch - Fetch the smack label from a file. | |
51 | * @ip: a pointer to the inode | |
52 | * @dp: a pointer to the dentry | |
53 | * | |
54 | * Returns a pointer to the master list entry for the Smack label | |
55 | * or NULL if there was no label to fetch. | |
56 | */ | |
676dac4b | 57 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
58 | { |
59 | int rc; | |
60 | char in[SMK_LABELLEN]; | |
61 | ||
62 | if (ip->i_op->getxattr == NULL) | |
63 | return NULL; | |
64 | ||
676dac4b | 65 | rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); |
e114e473 CS |
66 | if (rc < 0) |
67 | return NULL; | |
68 | ||
69 | return smk_import(in, rc); | |
70 | } | |
71 | ||
72 | /** | |
73 | * new_inode_smack - allocate an inode security blob | |
74 | * @smack: a pointer to the Smack label to use in the blob | |
75 | * | |
76 | * Returns the new blob or NULL if there's no memory available | |
77 | */ | |
78 | struct inode_smack *new_inode_smack(char *smack) | |
79 | { | |
80 | struct inode_smack *isp; | |
81 | ||
82 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
83 | if (isp == NULL) | |
84 | return NULL; | |
85 | ||
86 | isp->smk_inode = smack; | |
87 | isp->smk_flags = 0; | |
88 | mutex_init(&isp->smk_lock); | |
89 | ||
90 | return isp; | |
91 | } | |
92 | ||
7898e1f8 CS |
93 | /** |
94 | * new_task_smack - allocate a task security blob | |
95 | * @smack: a pointer to the Smack label to use in the blob | |
96 | * | |
97 | * Returns the new blob or NULL if there's no memory available | |
98 | */ | |
99 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
100 | { | |
101 | struct task_smack *tsp; | |
102 | ||
103 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
104 | if (tsp == NULL) | |
105 | return NULL; | |
106 | ||
107 | tsp->smk_task = task; | |
108 | tsp->smk_forked = forked; | |
109 | INIT_LIST_HEAD(&tsp->smk_rules); | |
110 | mutex_init(&tsp->smk_rules_lock); | |
111 | ||
112 | return tsp; | |
113 | } | |
114 | ||
115 | /** | |
116 | * smk_copy_rules - copy a rule set | |
117 | * @nhead - new rules header pointer | |
118 | * @ohead - old rules header pointer | |
119 | * | |
120 | * Returns 0 on success, -ENOMEM on error | |
121 | */ | |
122 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
123 | gfp_t gfp) | |
124 | { | |
125 | struct smack_rule *nrp; | |
126 | struct smack_rule *orp; | |
127 | int rc = 0; | |
128 | ||
129 | INIT_LIST_HEAD(nhead); | |
130 | ||
131 | list_for_each_entry_rcu(orp, ohead, list) { | |
132 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
133 | if (nrp == NULL) { | |
134 | rc = -ENOMEM; | |
135 | break; | |
136 | } | |
137 | *nrp = *orp; | |
138 | list_add_rcu(&nrp->list, nhead); | |
139 | } | |
140 | return rc; | |
141 | } | |
142 | ||
e114e473 CS |
143 | /* |
144 | * LSM hooks. | |
145 | * We he, that is fun! | |
146 | */ | |
147 | ||
148 | /** | |
9e48858f | 149 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 150 | * @ctp: child task pointer |
251a2a95 | 151 | * @mode: ptrace attachment mode |
e114e473 CS |
152 | * |
153 | * Returns 0 if access is OK, an error code otherwise | |
154 | * | |
155 | * Do the capability checks, and require read and write. | |
156 | */ | |
9e48858f | 157 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
158 | { |
159 | int rc; | |
ecfcc53f | 160 | struct smk_audit_info ad; |
7898e1f8 | 161 | char *tsp; |
e114e473 | 162 | |
9e48858f | 163 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
164 | if (rc != 0) |
165 | return rc; | |
166 | ||
676dac4b | 167 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
168 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
169 | smk_ad_setfield_u_tsk(&ad, ctp); | |
170 | ||
7898e1f8 | 171 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
172 | return rc; |
173 | } | |
174 | ||
175 | /** | |
176 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
177 | * @ptp: parent task pointer | |
178 | * | |
179 | * Returns 0 if access is OK, an error code otherwise | |
180 | * | |
181 | * Do the capability checks, and require read and write. | |
182 | */ | |
183 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
184 | { | |
185 | int rc; | |
ecfcc53f | 186 | struct smk_audit_info ad; |
7898e1f8 | 187 | char *tsp; |
5cd9c58f DH |
188 | |
189 | rc = cap_ptrace_traceme(ptp); | |
190 | if (rc != 0) | |
191 | return rc; | |
e114e473 | 192 | |
7898e1f8 | 193 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
194 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
195 | smk_ad_setfield_u_tsk(&ad, ptp); | |
196 | ||
7898e1f8 | 197 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
198 | return rc; |
199 | } | |
200 | ||
201 | /** | |
202 | * smack_syslog - Smack approval on syslog | |
203 | * @type: message type | |
204 | * | |
205 | * Require that the task has the floor label | |
206 | * | |
207 | * Returns 0 on success, error code otherwise. | |
208 | */ | |
12b3052c | 209 | static int smack_syslog(int typefrom_file) |
e114e473 | 210 | { |
12b3052c | 211 | int rc = 0; |
676dac4b | 212 | char *sp = smk_of_current(); |
e114e473 | 213 | |
e114e473 CS |
214 | if (capable(CAP_MAC_OVERRIDE)) |
215 | return 0; | |
216 | ||
217 | if (sp != smack_known_floor.smk_known) | |
218 | rc = -EACCES; | |
219 | ||
220 | return rc; | |
221 | } | |
222 | ||
223 | ||
224 | /* | |
225 | * Superblock Hooks. | |
226 | */ | |
227 | ||
228 | /** | |
229 | * smack_sb_alloc_security - allocate a superblock blob | |
230 | * @sb: the superblock getting the blob | |
231 | * | |
232 | * Returns 0 on success or -ENOMEM on error. | |
233 | */ | |
234 | static int smack_sb_alloc_security(struct super_block *sb) | |
235 | { | |
236 | struct superblock_smack *sbsp; | |
237 | ||
238 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
239 | ||
240 | if (sbsp == NULL) | |
241 | return -ENOMEM; | |
242 | ||
243 | sbsp->smk_root = smack_known_floor.smk_known; | |
244 | sbsp->smk_default = smack_known_floor.smk_known; | |
245 | sbsp->smk_floor = smack_known_floor.smk_known; | |
246 | sbsp->smk_hat = smack_known_hat.smk_known; | |
247 | sbsp->smk_initialized = 0; | |
248 | spin_lock_init(&sbsp->smk_sblock); | |
249 | ||
250 | sb->s_security = sbsp; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | /** | |
256 | * smack_sb_free_security - free a superblock blob | |
257 | * @sb: the superblock getting the blob | |
258 | * | |
259 | */ | |
260 | static void smack_sb_free_security(struct super_block *sb) | |
261 | { | |
262 | kfree(sb->s_security); | |
263 | sb->s_security = NULL; | |
264 | } | |
265 | ||
266 | /** | |
267 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 268 | * @orig: where to start |
251a2a95 | 269 | * @smackopts: mount options string |
e114e473 CS |
270 | * |
271 | * Returns 0 on success or -ENOMEM on error. | |
272 | * | |
273 | * Copy the Smack specific mount options out of the mount | |
274 | * options list. | |
275 | */ | |
e0007529 | 276 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
277 | { |
278 | char *cp, *commap, *otheropts, *dp; | |
279 | ||
e114e473 CS |
280 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
281 | if (otheropts == NULL) | |
282 | return -ENOMEM; | |
283 | ||
284 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
285 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
286 | dp = smackopts; | |
287 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
288 | dp = smackopts; | |
289 | else if (strstr(cp, SMK_FSHAT) == cp) | |
290 | dp = smackopts; | |
291 | else if (strstr(cp, SMK_FSROOT) == cp) | |
292 | dp = smackopts; | |
293 | else | |
294 | dp = otheropts; | |
295 | ||
296 | commap = strchr(cp, ','); | |
297 | if (commap != NULL) | |
298 | *commap = '\0'; | |
299 | ||
300 | if (*dp != '\0') | |
301 | strcat(dp, ","); | |
302 | strcat(dp, cp); | |
303 | } | |
304 | ||
305 | strcpy(orig, otheropts); | |
306 | free_page((unsigned long)otheropts); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | /** | |
312 | * smack_sb_kern_mount - Smack specific mount processing | |
313 | * @sb: the file system superblock | |
12204e24 | 314 | * @flags: the mount flags |
e114e473 CS |
315 | * @data: the smack mount options |
316 | * | |
317 | * Returns 0 on success, an error code on failure | |
318 | */ | |
12204e24 | 319 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
320 | { |
321 | struct dentry *root = sb->s_root; | |
322 | struct inode *inode = root->d_inode; | |
323 | struct superblock_smack *sp = sb->s_security; | |
324 | struct inode_smack *isp; | |
325 | char *op; | |
326 | char *commap; | |
327 | char *nsp; | |
328 | ||
329 | spin_lock(&sp->smk_sblock); | |
330 | if (sp->smk_initialized != 0) { | |
331 | spin_unlock(&sp->smk_sblock); | |
332 | return 0; | |
333 | } | |
334 | sp->smk_initialized = 1; | |
335 | spin_unlock(&sp->smk_sblock); | |
336 | ||
337 | for (op = data; op != NULL; op = commap) { | |
338 | commap = strchr(op, ','); | |
339 | if (commap != NULL) | |
340 | *commap++ = '\0'; | |
341 | ||
342 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
343 | op += strlen(SMK_FSHAT); | |
344 | nsp = smk_import(op, 0); | |
345 | if (nsp != NULL) | |
346 | sp->smk_hat = nsp; | |
347 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
348 | op += strlen(SMK_FSFLOOR); | |
349 | nsp = smk_import(op, 0); | |
350 | if (nsp != NULL) | |
351 | sp->smk_floor = nsp; | |
352 | } else if (strncmp(op, SMK_FSDEFAULT, | |
353 | strlen(SMK_FSDEFAULT)) == 0) { | |
354 | op += strlen(SMK_FSDEFAULT); | |
355 | nsp = smk_import(op, 0); | |
356 | if (nsp != NULL) | |
357 | sp->smk_default = nsp; | |
358 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
359 | op += strlen(SMK_FSROOT); | |
360 | nsp = smk_import(op, 0); | |
361 | if (nsp != NULL) | |
362 | sp->smk_root = nsp; | |
363 | } | |
364 | } | |
365 | ||
366 | /* | |
367 | * Initialize the root inode. | |
368 | */ | |
369 | isp = inode->i_security; | |
370 | if (isp == NULL) | |
371 | inode->i_security = new_inode_smack(sp->smk_root); | |
372 | else | |
373 | isp->smk_inode = sp->smk_root; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | /** | |
379 | * smack_sb_statfs - Smack check on statfs | |
380 | * @dentry: identifies the file system in question | |
381 | * | |
382 | * Returns 0 if current can read the floor of the filesystem, | |
383 | * and error code otherwise | |
384 | */ | |
385 | static int smack_sb_statfs(struct dentry *dentry) | |
386 | { | |
387 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
388 | int rc; |
389 | struct smk_audit_info ad; | |
390 | ||
a269434d | 391 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 392 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 393 | |
ecfcc53f EB |
394 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
395 | return rc; | |
e114e473 CS |
396 | } |
397 | ||
398 | /** | |
399 | * smack_sb_mount - Smack check for mounting | |
400 | * @dev_name: unused | |
251a2a95 | 401 | * @path: mount point |
e114e473 CS |
402 | * @type: unused |
403 | * @flags: unused | |
404 | * @data: unused | |
405 | * | |
406 | * Returns 0 if current can write the floor of the filesystem | |
407 | * being mounted on, an error code otherwise. | |
408 | */ | |
b5266eb4 | 409 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
410 | char *type, unsigned long flags, void *data) |
411 | { | |
d8c9584e | 412 | struct superblock_smack *sbp = path->dentry->d_sb->s_security; |
ecfcc53f | 413 | struct smk_audit_info ad; |
e114e473 | 414 | |
f48b7399 | 415 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f EB |
416 | smk_ad_setfield_u_fs_path(&ad, *path); |
417 | ||
418 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
419 | } |
420 | ||
421 | /** | |
422 | * smack_sb_umount - Smack check for unmounting | |
423 | * @mnt: file system to unmount | |
424 | * @flags: unused | |
425 | * | |
426 | * Returns 0 if current can write the floor of the filesystem | |
427 | * being unmounted, an error code otherwise. | |
428 | */ | |
429 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
430 | { | |
431 | struct superblock_smack *sbp; | |
ecfcc53f | 432 | struct smk_audit_info ad; |
a269434d | 433 | struct path path; |
e114e473 | 434 | |
a269434d EP |
435 | path.dentry = mnt->mnt_root; |
436 | path.mnt = mnt; | |
e114e473 | 437 | |
f48b7399 | 438 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 439 | smk_ad_setfield_u_fs_path(&ad, path); |
e114e473 | 440 | |
d8c9584e | 441 | sbp = path.dentry->d_sb->s_security; |
ecfcc53f | 442 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
e114e473 CS |
443 | } |
444 | ||
676dac4b CS |
445 | /* |
446 | * BPRM hooks | |
447 | */ | |
448 | ||
ce8a4321 CS |
449 | /** |
450 | * smack_bprm_set_creds - set creds for exec | |
451 | * @bprm: the exec information | |
452 | * | |
453 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
454 | */ | |
676dac4b CS |
455 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
456 | { | |
84088ba2 JS |
457 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
458 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 459 | struct inode_smack *isp; |
676dac4b CS |
460 | int rc; |
461 | ||
462 | rc = cap_bprm_set_creds(bprm); | |
463 | if (rc != 0) | |
464 | return rc; | |
465 | ||
466 | if (bprm->cred_prepared) | |
467 | return 0; | |
468 | ||
84088ba2 JS |
469 | isp = inode->i_security; |
470 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
471 | return 0; |
472 | ||
84088ba2 JS |
473 | if (bprm->unsafe) |
474 | return -EPERM; | |
676dac4b | 475 | |
84088ba2 JS |
476 | bsp->smk_task = isp->smk_task; |
477 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 478 | |
84088ba2 JS |
479 | return 0; |
480 | } | |
676dac4b | 481 | |
84088ba2 JS |
482 | /** |
483 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
484 | * from bprm. | |
485 | * | |
486 | * @bprm: binprm for exec | |
487 | */ | |
488 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
489 | { | |
490 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 491 | |
84088ba2 JS |
492 | if (bsp->smk_task != bsp->smk_forked) |
493 | current->pdeath_signal = 0; | |
494 | } | |
495 | ||
496 | /** | |
497 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
498 | * @bprm: binprm for exec | |
499 | * | |
500 | * Returns 0 on success. | |
501 | */ | |
502 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
503 | { | |
504 | struct task_smack *tsp = current_security(); | |
505 | int ret = cap_bprm_secureexec(bprm); | |
506 | ||
507 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
508 | ret = 1; | |
509 | ||
510 | return ret; | |
676dac4b CS |
511 | } |
512 | ||
e114e473 CS |
513 | /* |
514 | * Inode hooks | |
515 | */ | |
516 | ||
517 | /** | |
518 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 519 | * @inode: the inode in need of a blob |
e114e473 CS |
520 | * |
521 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
522 | */ | |
523 | static int smack_inode_alloc_security(struct inode *inode) | |
524 | { | |
676dac4b | 525 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
526 | if (inode->i_security == NULL) |
527 | return -ENOMEM; | |
528 | return 0; | |
529 | } | |
530 | ||
531 | /** | |
532 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 533 | * @inode: the inode with a blob |
e114e473 CS |
534 | * |
535 | * Clears the blob pointer in inode | |
536 | */ | |
537 | static void smack_inode_free_security(struct inode *inode) | |
538 | { | |
539 | kfree(inode->i_security); | |
540 | inode->i_security = NULL; | |
541 | } | |
542 | ||
543 | /** | |
544 | * smack_inode_init_security - copy out the smack from an inode | |
545 | * @inode: the inode | |
546 | * @dir: unused | |
2a7dba39 | 547 | * @qstr: unused |
e114e473 CS |
548 | * @name: where to put the attribute name |
549 | * @value: where to put the attribute value | |
550 | * @len: where to put the length of the attribute | |
551 | * | |
552 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
553 | */ | |
554 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
2a7dba39 EP |
555 | const struct qstr *qstr, char **name, |
556 | void **value, size_t *len) | |
e114e473 | 557 | { |
272cd7a8 CS |
558 | struct smack_known *skp; |
559 | char *csp = smk_of_current(); | |
e114e473 | 560 | char *isp = smk_of_inode(inode); |
5c6d1125 | 561 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 562 | int may; |
e114e473 CS |
563 | |
564 | if (name) { | |
565 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
566 | if (*name == NULL) | |
567 | return -ENOMEM; | |
568 | } | |
569 | ||
570 | if (value) { | |
272cd7a8 | 571 | skp = smk_find_entry(csp); |
7898e1f8 | 572 | rcu_read_lock(); |
272cd7a8 | 573 | may = smk_access_entry(csp, dsp, &skp->smk_rules); |
7898e1f8 | 574 | rcu_read_unlock(); |
5c6d1125 JS |
575 | |
576 | /* | |
577 | * If the access rule allows transmutation and | |
578 | * the directory requests transmutation then | |
579 | * by all means transmute. | |
580 | */ | |
7898e1f8 CS |
581 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
582 | smk_inode_transmutable(dir)) | |
5c6d1125 JS |
583 | isp = dsp; |
584 | ||
e114e473 CS |
585 | *value = kstrdup(isp, GFP_KERNEL); |
586 | if (*value == NULL) | |
587 | return -ENOMEM; | |
588 | } | |
589 | ||
590 | if (len) | |
591 | *len = strlen(isp) + 1; | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | /** | |
597 | * smack_inode_link - Smack check on link | |
598 | * @old_dentry: the existing object | |
599 | * @dir: unused | |
600 | * @new_dentry: the new object | |
601 | * | |
602 | * Returns 0 if access is permitted, an error code otherwise | |
603 | */ | |
604 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
605 | struct dentry *new_dentry) | |
606 | { | |
e114e473 | 607 | char *isp; |
ecfcc53f EB |
608 | struct smk_audit_info ad; |
609 | int rc; | |
610 | ||
a269434d | 611 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 612 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
613 | |
614 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 615 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
616 | |
617 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
618 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
619 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
620 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
621 | } |
622 | ||
623 | return rc; | |
624 | } | |
625 | ||
626 | /** | |
627 | * smack_inode_unlink - Smack check on inode deletion | |
628 | * @dir: containing directory object | |
629 | * @dentry: file to unlink | |
630 | * | |
631 | * Returns 0 if current can write the containing directory | |
632 | * and the object, error code otherwise | |
633 | */ | |
634 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
635 | { | |
636 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 637 | struct smk_audit_info ad; |
e114e473 CS |
638 | int rc; |
639 | ||
a269434d | 640 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
641 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
642 | ||
e114e473 CS |
643 | /* |
644 | * You need write access to the thing you're unlinking | |
645 | */ | |
ecfcc53f EB |
646 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
647 | if (rc == 0) { | |
e114e473 CS |
648 | /* |
649 | * You also need write access to the containing directory | |
650 | */ | |
ecfcc53f EB |
651 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
652 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
653 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
654 | } | |
e114e473 CS |
655 | return rc; |
656 | } | |
657 | ||
658 | /** | |
659 | * smack_inode_rmdir - Smack check on directory deletion | |
660 | * @dir: containing directory object | |
661 | * @dentry: directory to unlink | |
662 | * | |
663 | * Returns 0 if current can write the containing directory | |
664 | * and the directory, error code otherwise | |
665 | */ | |
666 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
667 | { | |
ecfcc53f | 668 | struct smk_audit_info ad; |
e114e473 CS |
669 | int rc; |
670 | ||
a269434d | 671 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
672 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
673 | ||
e114e473 CS |
674 | /* |
675 | * You need write access to the thing you're removing | |
676 | */ | |
ecfcc53f EB |
677 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
678 | if (rc == 0) { | |
e114e473 CS |
679 | /* |
680 | * You also need write access to the containing directory | |
681 | */ | |
ecfcc53f EB |
682 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
683 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
684 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
685 | } | |
e114e473 CS |
686 | |
687 | return rc; | |
688 | } | |
689 | ||
690 | /** | |
691 | * smack_inode_rename - Smack check on rename | |
692 | * @old_inode: the old directory | |
693 | * @old_dentry: unused | |
694 | * @new_inode: the new directory | |
695 | * @new_dentry: unused | |
696 | * | |
697 | * Read and write access is required on both the old and | |
698 | * new directories. | |
699 | * | |
700 | * Returns 0 if access is permitted, an error code otherwise | |
701 | */ | |
702 | static int smack_inode_rename(struct inode *old_inode, | |
703 | struct dentry *old_dentry, | |
704 | struct inode *new_inode, | |
705 | struct dentry *new_dentry) | |
706 | { | |
707 | int rc; | |
708 | char *isp; | |
ecfcc53f EB |
709 | struct smk_audit_info ad; |
710 | ||
a269434d | 711 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 712 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
713 | |
714 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 715 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
716 | |
717 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
718 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
719 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
720 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 721 | } |
e114e473 CS |
722 | return rc; |
723 | } | |
724 | ||
725 | /** | |
726 | * smack_inode_permission - Smack version of permission() | |
727 | * @inode: the inode in question | |
728 | * @mask: the access requested | |
e114e473 CS |
729 | * |
730 | * This is the important Smack hook. | |
731 | * | |
732 | * Returns 0 if access is permitted, -EACCES otherwise | |
733 | */ | |
e74f71eb | 734 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 735 | { |
ecfcc53f | 736 | struct smk_audit_info ad; |
e74f71eb | 737 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
738 | |
739 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
740 | /* |
741 | * No permission to check. Existence test. Yup, it's there. | |
742 | */ | |
743 | if (mask == 0) | |
744 | return 0; | |
8c9e80ed AK |
745 | |
746 | /* May be droppable after audit */ | |
e74f71eb | 747 | if (no_block) |
8c9e80ed | 748 | return -ECHILD; |
f48b7399 | 749 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
750 | smk_ad_setfield_u_fs_inode(&ad, inode); |
751 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
752 | } |
753 | ||
754 | /** | |
755 | * smack_inode_setattr - Smack check for setting attributes | |
756 | * @dentry: the object | |
757 | * @iattr: for the force flag | |
758 | * | |
759 | * Returns 0 if access is permitted, an error code otherwise | |
760 | */ | |
761 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
762 | { | |
ecfcc53f | 763 | struct smk_audit_info ad; |
e114e473 CS |
764 | /* |
765 | * Need to allow for clearing the setuid bit. | |
766 | */ | |
767 | if (iattr->ia_valid & ATTR_FORCE) | |
768 | return 0; | |
a269434d | 769 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 770 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 771 | |
ecfcc53f | 772 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
773 | } |
774 | ||
775 | /** | |
776 | * smack_inode_getattr - Smack check for getting attributes | |
777 | * @mnt: unused | |
778 | * @dentry: the object | |
779 | * | |
780 | * Returns 0 if access is permitted, an error code otherwise | |
781 | */ | |
782 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
783 | { | |
ecfcc53f | 784 | struct smk_audit_info ad; |
a269434d | 785 | struct path path; |
ecfcc53f | 786 | |
a269434d EP |
787 | path.dentry = dentry; |
788 | path.mnt = mnt; | |
ecfcc53f | 789 | |
f48b7399 | 790 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 791 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 792 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
793 | } |
794 | ||
795 | /** | |
796 | * smack_inode_setxattr - Smack check for setting xattrs | |
797 | * @dentry: the object | |
798 | * @name: name of the attribute | |
799 | * @value: unused | |
800 | * @size: unused | |
801 | * @flags: unused | |
802 | * | |
803 | * This protects the Smack attribute explicitly. | |
804 | * | |
805 | * Returns 0 if access is permitted, an error code otherwise | |
806 | */ | |
8f0cfa52 DH |
807 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
808 | const void *value, size_t size, int flags) | |
e114e473 | 809 | { |
ecfcc53f | 810 | struct smk_audit_info ad; |
bcdca225 | 811 | int rc = 0; |
e114e473 | 812 | |
bcdca225 CS |
813 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
814 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 815 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
816 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
817 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
818 | if (!capable(CAP_MAC_ADMIN)) |
819 | rc = -EPERM; | |
defc433b EB |
820 | /* |
821 | * check label validity here so import wont fail on | |
822 | * post_setxattr | |
823 | */ | |
824 | if (size == 0 || size >= SMK_LABELLEN || | |
825 | smk_import(value, size) == NULL) | |
4303154e | 826 | rc = -EINVAL; |
5c6d1125 JS |
827 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
828 | if (!capable(CAP_MAC_ADMIN)) | |
829 | rc = -EPERM; | |
830 | if (size != TRANS_TRUE_SIZE || | |
831 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
832 | rc = -EINVAL; | |
bcdca225 CS |
833 | } else |
834 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
835 | ||
a269434d | 836 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
837 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
838 | ||
bcdca225 | 839 | if (rc == 0) |
ecfcc53f | 840 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
841 | |
842 | return rc; | |
e114e473 CS |
843 | } |
844 | ||
845 | /** | |
846 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
847 | * @dentry: object | |
848 | * @name: attribute name | |
849 | * @value: attribute value | |
850 | * @size: attribute size | |
851 | * @flags: unused | |
852 | * | |
853 | * Set the pointer in the inode blob to the entry found | |
854 | * in the master label list. | |
855 | */ | |
8f0cfa52 DH |
856 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
857 | const void *value, size_t size, int flags) | |
e114e473 | 858 | { |
e114e473 | 859 | char *nsp; |
5c6d1125 | 860 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
861 | |
862 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 863 | nsp = smk_import(value, size); |
676dac4b CS |
864 | if (nsp != NULL) |
865 | isp->smk_inode = nsp; | |
866 | else | |
867 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
868 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
869 | nsp = smk_import(value, size); | |
676dac4b CS |
870 | if (nsp != NULL) |
871 | isp->smk_task = nsp; | |
872 | else | |
873 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
874 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
875 | nsp = smk_import(value, size); | |
876 | if (nsp != NULL) | |
877 | isp->smk_mmap = nsp; | |
878 | else | |
879 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
880 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
881 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
882 | |
883 | return; | |
884 | } | |
885 | ||
ce8a4321 | 886 | /** |
e114e473 CS |
887 | * smack_inode_getxattr - Smack check on getxattr |
888 | * @dentry: the object | |
889 | * @name: unused | |
890 | * | |
891 | * Returns 0 if access is permitted, an error code otherwise | |
892 | */ | |
8f0cfa52 | 893 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 894 | { |
ecfcc53f EB |
895 | struct smk_audit_info ad; |
896 | ||
a269434d | 897 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
898 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
899 | ||
900 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
901 | } |
902 | ||
ce8a4321 | 903 | /** |
e114e473 CS |
904 | * smack_inode_removexattr - Smack check on removexattr |
905 | * @dentry: the object | |
906 | * @name: name of the attribute | |
907 | * | |
908 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
909 | * | |
910 | * Returns 0 if access is permitted, an error code otherwise | |
911 | */ | |
8f0cfa52 | 912 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 913 | { |
676dac4b | 914 | struct inode_smack *isp; |
ecfcc53f | 915 | struct smk_audit_info ad; |
bcdca225 | 916 | int rc = 0; |
e114e473 | 917 | |
bcdca225 CS |
918 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
919 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 920 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 921 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
922 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
923 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
924 | if (!capable(CAP_MAC_ADMIN)) |
925 | rc = -EPERM; | |
926 | } else | |
927 | rc = cap_inode_removexattr(dentry, name); | |
928 | ||
a269434d | 929 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 930 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 931 | if (rc == 0) |
ecfcc53f | 932 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 933 | |
676dac4b CS |
934 | if (rc == 0) { |
935 | isp = dentry->d_inode->i_security; | |
936 | isp->smk_task = NULL; | |
7898e1f8 | 937 | isp->smk_mmap = NULL; |
676dac4b CS |
938 | } |
939 | ||
bcdca225 | 940 | return rc; |
e114e473 CS |
941 | } |
942 | ||
943 | /** | |
944 | * smack_inode_getsecurity - get smack xattrs | |
945 | * @inode: the object | |
946 | * @name: attribute name | |
947 | * @buffer: where to put the result | |
251a2a95 | 948 | * @alloc: unused |
e114e473 CS |
949 | * |
950 | * Returns the size of the attribute or an error code | |
951 | */ | |
952 | static int smack_inode_getsecurity(const struct inode *inode, | |
953 | const char *name, void **buffer, | |
954 | bool alloc) | |
955 | { | |
956 | struct socket_smack *ssp; | |
957 | struct socket *sock; | |
958 | struct super_block *sbp; | |
959 | struct inode *ip = (struct inode *)inode; | |
960 | char *isp; | |
961 | int ilen; | |
962 | int rc = 0; | |
963 | ||
964 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
965 | isp = smk_of_inode(inode); | |
966 | ilen = strlen(isp) + 1; | |
967 | *buffer = isp; | |
968 | return ilen; | |
969 | } | |
970 | ||
971 | /* | |
972 | * The rest of the Smack xattrs are only on sockets. | |
973 | */ | |
974 | sbp = ip->i_sb; | |
975 | if (sbp->s_magic != SOCKFS_MAGIC) | |
976 | return -EOPNOTSUPP; | |
977 | ||
978 | sock = SOCKET_I(ip); | |
2e1d146a | 979 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
980 | return -EOPNOTSUPP; |
981 | ||
982 | ssp = sock->sk->sk_security; | |
983 | ||
984 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
985 | isp = ssp->smk_in; | |
986 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
987 | isp = ssp->smk_out; | |
988 | else | |
989 | return -EOPNOTSUPP; | |
990 | ||
991 | ilen = strlen(isp) + 1; | |
992 | if (rc == 0) { | |
993 | *buffer = isp; | |
994 | rc = ilen; | |
995 | } | |
996 | ||
997 | return rc; | |
998 | } | |
999 | ||
1000 | ||
1001 | /** | |
1002 | * smack_inode_listsecurity - list the Smack attributes | |
1003 | * @inode: the object | |
1004 | * @buffer: where they go | |
1005 | * @buffer_size: size of buffer | |
1006 | * | |
1007 | * Returns 0 on success, -EINVAL otherwise | |
1008 | */ | |
1009 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1010 | size_t buffer_size) | |
1011 | { | |
1012 | int len = strlen(XATTR_NAME_SMACK); | |
1013 | ||
1014 | if (buffer != NULL && len <= buffer_size) { | |
1015 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1016 | return len; | |
1017 | } | |
1018 | return -EINVAL; | |
1019 | } | |
1020 | ||
d20bdda6 AD |
1021 | /** |
1022 | * smack_inode_getsecid - Extract inode's security id | |
1023 | * @inode: inode to extract the info from | |
1024 | * @secid: where result will be saved | |
1025 | */ | |
1026 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1027 | { | |
1028 | struct inode_smack *isp = inode->i_security; | |
1029 | ||
1030 | *secid = smack_to_secid(isp->smk_inode); | |
1031 | } | |
1032 | ||
e114e473 CS |
1033 | /* |
1034 | * File Hooks | |
1035 | */ | |
1036 | ||
1037 | /** | |
1038 | * smack_file_permission - Smack check on file operations | |
1039 | * @file: unused | |
1040 | * @mask: unused | |
1041 | * | |
1042 | * Returns 0 | |
1043 | * | |
1044 | * Should access checks be done on each read or write? | |
1045 | * UNICOS and SELinux say yes. | |
1046 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1047 | * | |
1048 | * I'll say no for now. Smack does not do the frequent | |
1049 | * label changing that SELinux does. | |
1050 | */ | |
1051 | static int smack_file_permission(struct file *file, int mask) | |
1052 | { | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | /** | |
1057 | * smack_file_alloc_security - assign a file security blob | |
1058 | * @file: the object | |
1059 | * | |
1060 | * The security blob for a file is a pointer to the master | |
1061 | * label list, so no allocation is done. | |
1062 | * | |
1063 | * Returns 0 | |
1064 | */ | |
1065 | static int smack_file_alloc_security(struct file *file) | |
1066 | { | |
676dac4b | 1067 | file->f_security = smk_of_current(); |
e114e473 CS |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * smack_file_free_security - clear a file security blob | |
1073 | * @file: the object | |
1074 | * | |
1075 | * The security blob for a file is a pointer to the master | |
1076 | * label list, so no memory is freed. | |
1077 | */ | |
1078 | static void smack_file_free_security(struct file *file) | |
1079 | { | |
1080 | file->f_security = NULL; | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * smack_file_ioctl - Smack check on ioctls | |
1085 | * @file: the object | |
1086 | * @cmd: what to do | |
1087 | * @arg: unused | |
1088 | * | |
1089 | * Relies heavily on the correct use of the ioctl command conventions. | |
1090 | * | |
1091 | * Returns 0 if allowed, error code otherwise | |
1092 | */ | |
1093 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1094 | unsigned long arg) | |
1095 | { | |
1096 | int rc = 0; | |
ecfcc53f EB |
1097 | struct smk_audit_info ad; |
1098 | ||
f48b7399 | 1099 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1100 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1101 | |
1102 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1103 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1104 | |
1105 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1106 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1107 | |
1108 | return rc; | |
1109 | } | |
1110 | ||
1111 | /** | |
1112 | * smack_file_lock - Smack check on file locking | |
1113 | * @file: the object | |
251a2a95 | 1114 | * @cmd: unused |
e114e473 CS |
1115 | * |
1116 | * Returns 0 if current has write access, error code otherwise | |
1117 | */ | |
1118 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1119 | { | |
ecfcc53f EB |
1120 | struct smk_audit_info ad; |
1121 | ||
92f42509 EP |
1122 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1123 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1124 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1125 | } |
1126 | ||
1127 | /** | |
1128 | * smack_file_fcntl - Smack check on fcntl | |
1129 | * @file: the object | |
1130 | * @cmd: what action to check | |
1131 | * @arg: unused | |
1132 | * | |
531f1d45 CS |
1133 | * Generally these operations are harmless. |
1134 | * File locking operations present an obvious mechanism | |
1135 | * for passing information, so they require write access. | |
1136 | * | |
e114e473 CS |
1137 | * Returns 0 if current has access, error code otherwise |
1138 | */ | |
1139 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1140 | unsigned long arg) | |
1141 | { | |
ecfcc53f | 1142 | struct smk_audit_info ad; |
531f1d45 | 1143 | int rc = 0; |
e114e473 | 1144 | |
ecfcc53f | 1145 | |
e114e473 | 1146 | switch (cmd) { |
e114e473 | 1147 | case F_GETLK: |
e114e473 CS |
1148 | case F_SETLK: |
1149 | case F_SETLKW: | |
1150 | case F_SETOWN: | |
1151 | case F_SETSIG: | |
531f1d45 CS |
1152 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1153 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1154 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1155 | break; |
1156 | default: | |
531f1d45 | 1157 | break; |
e114e473 CS |
1158 | } |
1159 | ||
1160 | return rc; | |
1161 | } | |
1162 | ||
7898e1f8 CS |
1163 | /** |
1164 | * smack_file_mmap : | |
1165 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1166 | * if mapping anonymous memory. | |
1167 | * @file contains the file structure for file to map (may be NULL). | |
1168 | * @reqprot contains the protection requested by the application. | |
1169 | * @prot contains the protection that will be applied by the kernel. | |
1170 | * @flags contains the operational flags. | |
1171 | * Return 0 if permission is granted. | |
1172 | */ | |
1173 | static int smack_file_mmap(struct file *file, | |
1174 | unsigned long reqprot, unsigned long prot, | |
1175 | unsigned long flags, unsigned long addr, | |
1176 | unsigned long addr_only) | |
1177 | { | |
272cd7a8 | 1178 | struct smack_known *skp; |
7898e1f8 CS |
1179 | struct smack_rule *srp; |
1180 | struct task_smack *tsp; | |
1181 | char *sp; | |
1182 | char *msmack; | |
0e0a070d | 1183 | char *osmack; |
7898e1f8 CS |
1184 | struct inode_smack *isp; |
1185 | struct dentry *dp; | |
0e0a070d CS |
1186 | int may; |
1187 | int mmay; | |
1188 | int tmay; | |
7898e1f8 CS |
1189 | int rc; |
1190 | ||
1191 | /* do DAC check on address space usage */ | |
1192 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1193 | if (rc || addr_only) | |
1194 | return rc; | |
1195 | ||
1196 | if (file == NULL || file->f_dentry == NULL) | |
1197 | return 0; | |
1198 | ||
1199 | dp = file->f_dentry; | |
1200 | ||
1201 | if (dp->d_inode == NULL) | |
1202 | return 0; | |
1203 | ||
1204 | isp = dp->d_inode->i_security; | |
1205 | if (isp->smk_mmap == NULL) | |
1206 | return 0; | |
1207 | msmack = isp->smk_mmap; | |
1208 | ||
1209 | tsp = current_security(); | |
1210 | sp = smk_of_current(); | |
272cd7a8 | 1211 | skp = smk_find_entry(sp); |
7898e1f8 CS |
1212 | rc = 0; |
1213 | ||
1214 | rcu_read_lock(); | |
1215 | /* | |
1216 | * For each Smack rule associated with the subject | |
1217 | * label verify that the SMACK64MMAP also has access | |
1218 | * to that rule's object label. | |
7898e1f8 | 1219 | */ |
272cd7a8 | 1220 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1221 | osmack = srp->smk_object; |
7898e1f8 CS |
1222 | /* |
1223 | * Matching labels always allows access. | |
1224 | */ | |
0e0a070d | 1225 | if (msmack == osmack) |
7898e1f8 | 1226 | continue; |
0e0a070d CS |
1227 | /* |
1228 | * If there is a matching local rule take | |
1229 | * that into account as well. | |
1230 | */ | |
1231 | may = smk_access_entry(srp->smk_subject, osmack, | |
1232 | &tsp->smk_rules); | |
1233 | if (may == -ENOENT) | |
1234 | may = srp->smk_access; | |
1235 | else | |
1236 | may &= srp->smk_access; | |
1237 | /* | |
1238 | * If may is zero the SMACK64MMAP subject can't | |
1239 | * possibly have less access. | |
1240 | */ | |
1241 | if (may == 0) | |
1242 | continue; | |
1243 | ||
1244 | /* | |
1245 | * Fetch the global list entry. | |
1246 | * If there isn't one a SMACK64MMAP subject | |
1247 | * can't have as much access as current. | |
1248 | */ | |
272cd7a8 CS |
1249 | skp = smk_find_entry(msmack); |
1250 | mmay = smk_access_entry(msmack, osmack, &skp->smk_rules); | |
0e0a070d CS |
1251 | if (mmay == -ENOENT) { |
1252 | rc = -EACCES; | |
1253 | break; | |
1254 | } | |
1255 | /* | |
1256 | * If there is a local entry it modifies the | |
1257 | * potential access, too. | |
1258 | */ | |
1259 | tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules); | |
1260 | if (tmay != -ENOENT) | |
1261 | mmay &= tmay; | |
7898e1f8 | 1262 | |
0e0a070d CS |
1263 | /* |
1264 | * If there is any access available to current that is | |
1265 | * not available to a SMACK64MMAP subject | |
1266 | * deny access. | |
1267 | */ | |
75a25637 | 1268 | if ((may | mmay) != mmay) { |
0e0a070d | 1269 | rc = -EACCES; |
7898e1f8 | 1270 | break; |
0e0a070d | 1271 | } |
7898e1f8 CS |
1272 | } |
1273 | ||
1274 | rcu_read_unlock(); | |
1275 | ||
1276 | return rc; | |
1277 | } | |
1278 | ||
e114e473 CS |
1279 | /** |
1280 | * smack_file_set_fowner - set the file security blob value | |
1281 | * @file: object in question | |
1282 | * | |
1283 | * Returns 0 | |
1284 | * Further research may be required on this one. | |
1285 | */ | |
1286 | static int smack_file_set_fowner(struct file *file) | |
1287 | { | |
676dac4b | 1288 | file->f_security = smk_of_current(); |
e114e473 CS |
1289 | return 0; |
1290 | } | |
1291 | ||
1292 | /** | |
1293 | * smack_file_send_sigiotask - Smack on sigio | |
1294 | * @tsk: The target task | |
1295 | * @fown: the object the signal come from | |
1296 | * @signum: unused | |
1297 | * | |
1298 | * Allow a privileged task to get signals even if it shouldn't | |
1299 | * | |
1300 | * Returns 0 if a subject with the object's smack could | |
1301 | * write to the task, an error code otherwise. | |
1302 | */ | |
1303 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1304 | struct fown_struct *fown, int signum) | |
1305 | { | |
1306 | struct file *file; | |
1307 | int rc; | |
676dac4b | 1308 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1309 | struct smk_audit_info ad; |
e114e473 CS |
1310 | |
1311 | /* | |
1312 | * struct fown_struct is never outside the context of a struct file | |
1313 | */ | |
1314 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1315 | |
ecfcc53f EB |
1316 | /* we don't log here as rc can be overriden */ |
1317 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1318 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1319 | rc = 0; |
1320 | ||
1321 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1322 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1323 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1324 | return rc; |
1325 | } | |
1326 | ||
1327 | /** | |
1328 | * smack_file_receive - Smack file receive check | |
1329 | * @file: the object | |
1330 | * | |
1331 | * Returns 0 if current has access, error code otherwise | |
1332 | */ | |
1333 | static int smack_file_receive(struct file *file) | |
1334 | { | |
1335 | int may = 0; | |
ecfcc53f | 1336 | struct smk_audit_info ad; |
e114e473 | 1337 | |
ecfcc53f EB |
1338 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1339 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1340 | /* |
1341 | * This code relies on bitmasks. | |
1342 | */ | |
1343 | if (file->f_mode & FMODE_READ) | |
1344 | may = MAY_READ; | |
1345 | if (file->f_mode & FMODE_WRITE) | |
1346 | may |= MAY_WRITE; | |
1347 | ||
ecfcc53f | 1348 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1349 | } |
1350 | ||
531f1d45 CS |
1351 | /** |
1352 | * smack_dentry_open - Smack dentry open processing | |
1353 | * @file: the object | |
1354 | * @cred: unused | |
1355 | * | |
1356 | * Set the security blob in the file structure. | |
1357 | * | |
1358 | * Returns 0 | |
1359 | */ | |
1360 | static int smack_dentry_open(struct file *file, const struct cred *cred) | |
1361 | { | |
1362 | struct inode_smack *isp = file->f_path.dentry->d_inode->i_security; | |
1363 | ||
1364 | file->f_security = isp->smk_inode; | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
e114e473 CS |
1369 | /* |
1370 | * Task hooks | |
1371 | */ | |
1372 | ||
ee18d64c DH |
1373 | /** |
1374 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1375 | * @new: the new credentials | |
1376 | * @gfp: the atomicity of any memory allocations | |
1377 | * | |
1378 | * Prepare a blank set of credentials for modification. This must allocate all | |
1379 | * the memory the LSM module might require such that cred_transfer() can | |
1380 | * complete without error. | |
1381 | */ | |
1382 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1383 | { | |
7898e1f8 CS |
1384 | struct task_smack *tsp; |
1385 | ||
1386 | tsp = new_task_smack(NULL, NULL, gfp); | |
1387 | if (tsp == NULL) | |
676dac4b | 1388 | return -ENOMEM; |
7898e1f8 CS |
1389 | |
1390 | cred->security = tsp; | |
1391 | ||
ee18d64c DH |
1392 | return 0; |
1393 | } | |
1394 | ||
1395 | ||
e114e473 | 1396 | /** |
f1752eec DH |
1397 | * smack_cred_free - "free" task-level security credentials |
1398 | * @cred: the credentials in question | |
e114e473 | 1399 | * |
e114e473 | 1400 | */ |
f1752eec | 1401 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1402 | { |
7898e1f8 CS |
1403 | struct task_smack *tsp = cred->security; |
1404 | struct smack_rule *rp; | |
1405 | struct list_head *l; | |
1406 | struct list_head *n; | |
1407 | ||
1408 | if (tsp == NULL) | |
1409 | return; | |
1410 | cred->security = NULL; | |
1411 | ||
1412 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1413 | rp = list_entry(l, struct smack_rule, list); | |
1414 | list_del(&rp->list); | |
1415 | kfree(rp); | |
1416 | } | |
1417 | kfree(tsp); | |
e114e473 CS |
1418 | } |
1419 | ||
d84f4f99 DH |
1420 | /** |
1421 | * smack_cred_prepare - prepare new set of credentials for modification | |
1422 | * @new: the new credentials | |
1423 | * @old: the original credentials | |
1424 | * @gfp: the atomicity of any memory allocations | |
1425 | * | |
1426 | * Prepare a new set of credentials for modification. | |
1427 | */ | |
1428 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1429 | gfp_t gfp) | |
1430 | { | |
676dac4b CS |
1431 | struct task_smack *old_tsp = old->security; |
1432 | struct task_smack *new_tsp; | |
7898e1f8 | 1433 | int rc; |
676dac4b | 1434 | |
7898e1f8 | 1435 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1436 | if (new_tsp == NULL) |
1437 | return -ENOMEM; | |
1438 | ||
7898e1f8 CS |
1439 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1440 | if (rc != 0) | |
1441 | return rc; | |
1442 | ||
676dac4b | 1443 | new->security = new_tsp; |
d84f4f99 DH |
1444 | return 0; |
1445 | } | |
1446 | ||
ee18d64c DH |
1447 | /** |
1448 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1449 | * @new: the new credentials | |
1450 | * @old: the original credentials | |
1451 | * | |
1452 | * Fill in a set of blank credentials from another set of credentials. | |
1453 | */ | |
1454 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1455 | { | |
676dac4b CS |
1456 | struct task_smack *old_tsp = old->security; |
1457 | struct task_smack *new_tsp = new->security; | |
1458 | ||
1459 | new_tsp->smk_task = old_tsp->smk_task; | |
1460 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1461 | mutex_init(&new_tsp->smk_rules_lock); |
1462 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1463 | ||
1464 | ||
1465 | /* cbs copy rule list */ | |
ee18d64c DH |
1466 | } |
1467 | ||
3a3b7ce9 DH |
1468 | /** |
1469 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1470 | * @new: points to the set of credentials to be modified. |
1471 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1472 | * |
1473 | * Set the security data for a kernel service. | |
1474 | */ | |
1475 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1476 | { | |
676dac4b | 1477 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1478 | char *smack = smack_from_secid(secid); |
1479 | ||
1480 | if (smack == NULL) | |
1481 | return -EINVAL; | |
1482 | ||
676dac4b | 1483 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1484 | return 0; |
1485 | } | |
1486 | ||
1487 | /** | |
1488 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1489 | * @new: points to the set of credentials to be modified |
1490 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1491 | * |
1492 | * Set the file creation context in a set of credentials to the same | |
1493 | * as the objective context of the specified inode | |
1494 | */ | |
1495 | static int smack_kernel_create_files_as(struct cred *new, | |
1496 | struct inode *inode) | |
1497 | { | |
1498 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1499 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1500 | |
676dac4b CS |
1501 | tsp->smk_forked = isp->smk_inode; |
1502 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1503 | return 0; |
1504 | } | |
1505 | ||
ecfcc53f EB |
1506 | /** |
1507 | * smk_curacc_on_task - helper to log task related access | |
1508 | * @p: the task object | |
531f1d45 CS |
1509 | * @access: the access requested |
1510 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1511 | * |
1512 | * Return 0 if access is permitted | |
1513 | */ | |
531f1d45 CS |
1514 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1515 | const char *caller) | |
ecfcc53f EB |
1516 | { |
1517 | struct smk_audit_info ad; | |
1518 | ||
531f1d45 | 1519 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1520 | smk_ad_setfield_u_tsk(&ad, p); |
676dac4b | 1521 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1522 | } |
1523 | ||
e114e473 CS |
1524 | /** |
1525 | * smack_task_setpgid - Smack check on setting pgid | |
1526 | * @p: the task object | |
1527 | * @pgid: unused | |
1528 | * | |
1529 | * Return 0 if write access is permitted | |
1530 | */ | |
1531 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1532 | { | |
531f1d45 | 1533 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1534 | } |
1535 | ||
1536 | /** | |
1537 | * smack_task_getpgid - Smack access check for getpgid | |
1538 | * @p: the object task | |
1539 | * | |
1540 | * Returns 0 if current can read the object task, error code otherwise | |
1541 | */ | |
1542 | static int smack_task_getpgid(struct task_struct *p) | |
1543 | { | |
531f1d45 | 1544 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1545 | } |
1546 | ||
1547 | /** | |
1548 | * smack_task_getsid - Smack access check for getsid | |
1549 | * @p: the object task | |
1550 | * | |
1551 | * Returns 0 if current can read the object task, error code otherwise | |
1552 | */ | |
1553 | static int smack_task_getsid(struct task_struct *p) | |
1554 | { | |
531f1d45 | 1555 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1556 | } |
1557 | ||
1558 | /** | |
1559 | * smack_task_getsecid - get the secid of the task | |
1560 | * @p: the object task | |
1561 | * @secid: where to put the result | |
1562 | * | |
1563 | * Sets the secid to contain a u32 version of the smack label. | |
1564 | */ | |
1565 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1566 | { | |
676dac4b | 1567 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1568 | } |
1569 | ||
1570 | /** | |
1571 | * smack_task_setnice - Smack check on setting nice | |
1572 | * @p: the task object | |
1573 | * @nice: unused | |
1574 | * | |
1575 | * Return 0 if write access is permitted | |
1576 | */ | |
1577 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1578 | { | |
bcdca225 CS |
1579 | int rc; |
1580 | ||
1581 | rc = cap_task_setnice(p, nice); | |
1582 | if (rc == 0) | |
531f1d45 | 1583 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1584 | return rc; |
e114e473 CS |
1585 | } |
1586 | ||
1587 | /** | |
1588 | * smack_task_setioprio - Smack check on setting ioprio | |
1589 | * @p: the task object | |
1590 | * @ioprio: unused | |
1591 | * | |
1592 | * Return 0 if write access is permitted | |
1593 | */ | |
1594 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1595 | { | |
bcdca225 CS |
1596 | int rc; |
1597 | ||
1598 | rc = cap_task_setioprio(p, ioprio); | |
1599 | if (rc == 0) | |
531f1d45 | 1600 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1601 | return rc; |
e114e473 CS |
1602 | } |
1603 | ||
1604 | /** | |
1605 | * smack_task_getioprio - Smack check on reading ioprio | |
1606 | * @p: the task object | |
1607 | * | |
1608 | * Return 0 if read access is permitted | |
1609 | */ | |
1610 | static int smack_task_getioprio(struct task_struct *p) | |
1611 | { | |
531f1d45 | 1612 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1613 | } |
1614 | ||
1615 | /** | |
1616 | * smack_task_setscheduler - Smack check on setting scheduler | |
1617 | * @p: the task object | |
1618 | * @policy: unused | |
1619 | * @lp: unused | |
1620 | * | |
1621 | * Return 0 if read access is permitted | |
1622 | */ | |
b0ae1981 | 1623 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1624 | { |
bcdca225 CS |
1625 | int rc; |
1626 | ||
b0ae1981 | 1627 | rc = cap_task_setscheduler(p); |
bcdca225 | 1628 | if (rc == 0) |
531f1d45 | 1629 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1630 | return rc; |
e114e473 CS |
1631 | } |
1632 | ||
1633 | /** | |
1634 | * smack_task_getscheduler - Smack check on reading scheduler | |
1635 | * @p: the task object | |
1636 | * | |
1637 | * Return 0 if read access is permitted | |
1638 | */ | |
1639 | static int smack_task_getscheduler(struct task_struct *p) | |
1640 | { | |
531f1d45 | 1641 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1642 | } |
1643 | ||
1644 | /** | |
1645 | * smack_task_movememory - Smack check on moving memory | |
1646 | * @p: the task object | |
1647 | * | |
1648 | * Return 0 if write access is permitted | |
1649 | */ | |
1650 | static int smack_task_movememory(struct task_struct *p) | |
1651 | { | |
531f1d45 | 1652 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1653 | } |
1654 | ||
1655 | /** | |
1656 | * smack_task_kill - Smack check on signal delivery | |
1657 | * @p: the task object | |
1658 | * @info: unused | |
1659 | * @sig: unused | |
1660 | * @secid: identifies the smack to use in lieu of current's | |
1661 | * | |
1662 | * Return 0 if write access is permitted | |
1663 | * | |
1664 | * The secid behavior is an artifact of an SELinux hack | |
1665 | * in the USB code. Someday it may go away. | |
1666 | */ | |
1667 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1668 | int sig, u32 secid) | |
1669 | { | |
ecfcc53f EB |
1670 | struct smk_audit_info ad; |
1671 | ||
1672 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1673 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1674 | /* |
1675 | * Sending a signal requires that the sender | |
1676 | * can write the receiver. | |
1677 | */ | |
1678 | if (secid == 0) | |
676dac4b CS |
1679 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1680 | &ad); | |
e114e473 CS |
1681 | /* |
1682 | * If the secid isn't 0 we're dealing with some USB IO | |
1683 | * specific behavior. This is not clean. For one thing | |
1684 | * we can't take privilege into account. | |
1685 | */ | |
676dac4b CS |
1686 | return smk_access(smack_from_secid(secid), |
1687 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1688 | } |
1689 | ||
1690 | /** | |
1691 | * smack_task_wait - Smack access check for waiting | |
1692 | * @p: task to wait for | |
1693 | * | |
1694 | * Returns 0 if current can wait for p, error code otherwise | |
1695 | */ | |
1696 | static int smack_task_wait(struct task_struct *p) | |
1697 | { | |
ecfcc53f | 1698 | struct smk_audit_info ad; |
676dac4b CS |
1699 | char *sp = smk_of_current(); |
1700 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1701 | int rc; |
1702 | ||
ecfcc53f | 1703 | /* we don't log here, we can be overriden */ |
676dac4b | 1704 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1705 | if (rc == 0) |
ecfcc53f | 1706 | goto out_log; |
e114e473 CS |
1707 | |
1708 | /* | |
1709 | * Allow the operation to succeed if either task | |
1710 | * has privilege to perform operations that might | |
1711 | * account for the smack labels having gotten to | |
1712 | * be different in the first place. | |
1713 | * | |
5cd9c58f | 1714 | * This breaks the strict subject/object access |
e114e473 CS |
1715 | * control ideal, taking the object's privilege |
1716 | * state into account in the decision as well as | |
1717 | * the smack value. | |
1718 | */ | |
5cd9c58f | 1719 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1720 | rc = 0; |
1721 | /* we log only if we didn't get overriden */ | |
1722 | out_log: | |
1723 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1724 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1725 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1726 | return rc; |
1727 | } | |
1728 | ||
1729 | /** | |
1730 | * smack_task_to_inode - copy task smack into the inode blob | |
1731 | * @p: task to copy from | |
251a2a95 | 1732 | * @inode: inode to copy to |
e114e473 CS |
1733 | * |
1734 | * Sets the smack pointer in the inode security blob | |
1735 | */ | |
1736 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1737 | { | |
1738 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1739 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1740 | } |
1741 | ||
1742 | /* | |
1743 | * Socket hooks. | |
1744 | */ | |
1745 | ||
1746 | /** | |
1747 | * smack_sk_alloc_security - Allocate a socket blob | |
1748 | * @sk: the socket | |
1749 | * @family: unused | |
251a2a95 | 1750 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1751 | * |
1752 | * Assign Smack pointers to current | |
1753 | * | |
1754 | * Returns 0 on success, -ENOMEM is there's no memory | |
1755 | */ | |
1756 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1757 | { | |
676dac4b | 1758 | char *csp = smk_of_current(); |
e114e473 CS |
1759 | struct socket_smack *ssp; |
1760 | ||
1761 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1762 | if (ssp == NULL) | |
1763 | return -ENOMEM; | |
1764 | ||
1765 | ssp->smk_in = csp; | |
1766 | ssp->smk_out = csp; | |
272cd7a8 | 1767 | ssp->smk_packet = NULL; |
e114e473 CS |
1768 | |
1769 | sk->sk_security = ssp; | |
1770 | ||
1771 | return 0; | |
1772 | } | |
1773 | ||
1774 | /** | |
1775 | * smack_sk_free_security - Free a socket blob | |
1776 | * @sk: the socket | |
1777 | * | |
1778 | * Clears the blob pointer | |
1779 | */ | |
1780 | static void smack_sk_free_security(struct sock *sk) | |
1781 | { | |
1782 | kfree(sk->sk_security); | |
1783 | } | |
1784 | ||
07feee8f PM |
1785 | /** |
1786 | * smack_host_label - check host based restrictions | |
1787 | * @sip: the object end | |
1788 | * | |
1789 | * looks for host based access restrictions | |
1790 | * | |
1791 | * This version will only be appropriate for really small sets of single label | |
1792 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1793 | * taken before calling this function. | |
1794 | * | |
1795 | * Returns the label of the far end or NULL if it's not special. | |
1796 | */ | |
1797 | static char *smack_host_label(struct sockaddr_in *sip) | |
1798 | { | |
1799 | struct smk_netlbladdr *snp; | |
1800 | struct in_addr *siap = &sip->sin_addr; | |
1801 | ||
1802 | if (siap->s_addr == 0) | |
1803 | return NULL; | |
1804 | ||
1805 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1806 | /* | |
1807 | * we break after finding the first match because | |
1808 | * the list is sorted from longest to shortest mask | |
1809 | * so we have found the most specific match | |
1810 | */ | |
1811 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1812 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1813 | /* we have found the special CIPSO option */ | |
1814 | if (snp->smk_label == smack_cipso_option) | |
1815 | return NULL; | |
07feee8f | 1816 | return snp->smk_label; |
4303154e | 1817 | } |
07feee8f PM |
1818 | |
1819 | return NULL; | |
1820 | } | |
1821 | ||
e114e473 CS |
1822 | /** |
1823 | * smack_set_catset - convert a capset to netlabel mls categories | |
1824 | * @catset: the Smack categories | |
1825 | * @sap: where to put the netlabel categories | |
1826 | * | |
1827 | * Allocates and fills attr.mls.cat | |
1828 | */ | |
1829 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1830 | { | |
1831 | unsigned char *cp; | |
1832 | unsigned char m; | |
1833 | int cat; | |
1834 | int rc; | |
1835 | int byte; | |
1836 | ||
c60264c4 | 1837 | if (!catset) |
e114e473 CS |
1838 | return; |
1839 | ||
1840 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1841 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1842 | sap->attr.mls.cat->startbit = 0; | |
1843 | ||
1844 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1845 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1846 | if ((m & *cp) == 0) | |
1847 | continue; | |
1848 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1849 | cat, GFP_ATOMIC); | |
1850 | } | |
1851 | } | |
1852 | ||
1853 | /** | |
1854 | * smack_to_secattr - fill a secattr from a smack value | |
1855 | * @smack: the smack value | |
1856 | * @nlsp: where the result goes | |
1857 | * | |
1858 | * Casey says that CIPSO is good enough for now. | |
1859 | * It can be used to effect. | |
1860 | * It can also be abused to effect when necessary. | |
25985edc | 1861 | * Apologies to the TSIG group in general and GW in particular. |
e114e473 CS |
1862 | */ |
1863 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1864 | { | |
1865 | struct smack_cipso cipso; | |
1866 | int rc; | |
1867 | ||
6d3dc07c CS |
1868 | nlsp->domain = smack; |
1869 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1870 | |
6d3dc07c CS |
1871 | rc = smack_to_cipso(smack, &cipso); |
1872 | if (rc == 0) { | |
1873 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1874 | smack_set_catset(cipso.smk_catset, nlsp); | |
1875 | } else { | |
1876 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1877 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1878 | } |
1879 | } | |
1880 | ||
1881 | /** | |
1882 | * smack_netlabel - Set the secattr on a socket | |
1883 | * @sk: the socket | |
6d3dc07c | 1884 | * @labeled: socket label scheme |
e114e473 CS |
1885 | * |
1886 | * Convert the outbound smack value (smk_out) to a | |
1887 | * secattr and attach it to the socket. | |
1888 | * | |
1889 | * Returns 0 on success or an error code | |
1890 | */ | |
6d3dc07c | 1891 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1892 | { |
07feee8f | 1893 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1894 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1895 | int rc = 0; |
e114e473 | 1896 | |
6d3dc07c CS |
1897 | /* |
1898 | * Usually the netlabel code will handle changing the | |
1899 | * packet labeling based on the label. | |
1900 | * The case of a single label host is different, because | |
1901 | * a single label host should never get a labeled packet | |
1902 | * even though the label is usually associated with a packet | |
1903 | * label. | |
1904 | */ | |
1905 | local_bh_disable(); | |
1906 | bh_lock_sock_nested(sk); | |
1907 | ||
1908 | if (ssp->smk_out == smack_net_ambient || | |
1909 | labeled == SMACK_UNLABELED_SOCKET) | |
1910 | netlbl_sock_delattr(sk); | |
1911 | else { | |
1912 | netlbl_secattr_init(&secattr); | |
1913 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1914 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1915 | netlbl_secattr_destroy(&secattr); |
1916 | } | |
1917 | ||
1918 | bh_unlock_sock(sk); | |
1919 | local_bh_enable(); | |
4bc87e62 | 1920 | |
e114e473 CS |
1921 | return rc; |
1922 | } | |
1923 | ||
07feee8f PM |
1924 | /** |
1925 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1926 | * @sk: the socket | |
1927 | * @sap: the destination address | |
1928 | * | |
1929 | * Set the correct secattr for the given socket based on the destination | |
1930 | * address and perform any outbound access checks needed. | |
1931 | * | |
1932 | * Returns 0 on success or an error code. | |
1933 | * | |
1934 | */ | |
1935 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1936 | { | |
1937 | int rc; | |
1938 | int sk_lbl; | |
1939 | char *hostsp; | |
1940 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1941 | struct smk_audit_info ad; |
07feee8f PM |
1942 | |
1943 | rcu_read_lock(); | |
1944 | hostsp = smack_host_label(sap); | |
1945 | if (hostsp != NULL) { | |
1946 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1947 | #ifdef CONFIG_AUDIT |
1948 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1949 | ad.a.u.net.family = sap->sin_family; | |
1950 | ad.a.u.net.dport = sap->sin_port; | |
1951 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1952 | #endif | |
1953 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1954 | } else { |
1955 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1956 | rc = 0; | |
1957 | } | |
1958 | rcu_read_unlock(); | |
1959 | if (rc != 0) | |
1960 | return rc; | |
1961 | ||
1962 | return smack_netlabel(sk, sk_lbl); | |
1963 | } | |
1964 | ||
e114e473 CS |
1965 | /** |
1966 | * smack_inode_setsecurity - set smack xattrs | |
1967 | * @inode: the object | |
1968 | * @name: attribute name | |
1969 | * @value: attribute value | |
1970 | * @size: size of the attribute | |
1971 | * @flags: unused | |
1972 | * | |
1973 | * Sets the named attribute in the appropriate blob | |
1974 | * | |
1975 | * Returns 0 on success, or an error code | |
1976 | */ | |
1977 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1978 | const void *value, size_t size, int flags) | |
1979 | { | |
1980 | char *sp; | |
1981 | struct inode_smack *nsp = inode->i_security; | |
1982 | struct socket_smack *ssp; | |
1983 | struct socket *sock; | |
4bc87e62 | 1984 | int rc = 0; |
e114e473 | 1985 | |
4303154e | 1986 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1987 | return -EACCES; |
1988 | ||
1989 | sp = smk_import(value, size); | |
1990 | if (sp == NULL) | |
1991 | return -EINVAL; | |
1992 | ||
1993 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1994 | nsp->smk_inode = sp; | |
ddd29ec6 | 1995 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1996 | return 0; |
1997 | } | |
1998 | /* | |
1999 | * The rest of the Smack xattrs are only on sockets. | |
2000 | */ | |
2001 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2002 | return -EOPNOTSUPP; | |
2003 | ||
2004 | sock = SOCKET_I(inode); | |
2e1d146a | 2005 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2006 | return -EOPNOTSUPP; |
2007 | ||
2008 | ssp = sock->sk->sk_security; | |
2009 | ||
2010 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
2011 | ssp->smk_in = sp; | |
2012 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
2013 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
2014 | if (sock->sk->sk_family != PF_UNIX) { |
2015 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
2016 | if (rc != 0) | |
2017 | printk(KERN_WARNING | |
2018 | "Smack: \"%s\" netlbl error %d.\n", | |
2019 | __func__, -rc); | |
2020 | } | |
e114e473 CS |
2021 | } else |
2022 | return -EOPNOTSUPP; | |
2023 | ||
2024 | return 0; | |
2025 | } | |
2026 | ||
2027 | /** | |
2028 | * smack_socket_post_create - finish socket setup | |
2029 | * @sock: the socket | |
2030 | * @family: protocol family | |
2031 | * @type: unused | |
2032 | * @protocol: unused | |
2033 | * @kern: unused | |
2034 | * | |
2035 | * Sets the netlabel information on the socket | |
2036 | * | |
2037 | * Returns 0 on success, and error code otherwise | |
2038 | */ | |
2039 | static int smack_socket_post_create(struct socket *sock, int family, | |
2040 | int type, int protocol, int kern) | |
2041 | { | |
2e1d146a | 2042 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2043 | return 0; |
2044 | /* | |
2045 | * Set the outbound netlbl. | |
2046 | */ | |
6d3dc07c CS |
2047 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2048 | } | |
2049 | ||
6d3dc07c CS |
2050 | /** |
2051 | * smack_socket_connect - connect access check | |
2052 | * @sock: the socket | |
2053 | * @sap: the other end | |
2054 | * @addrlen: size of sap | |
2055 | * | |
2056 | * Verifies that a connection may be possible | |
2057 | * | |
2058 | * Returns 0 on success, and error code otherwise | |
2059 | */ | |
2060 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2061 | int addrlen) | |
2062 | { | |
6d3dc07c CS |
2063 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
2064 | return 0; | |
6d3dc07c CS |
2065 | if (addrlen < sizeof(struct sockaddr_in)) |
2066 | return -EINVAL; | |
2067 | ||
07feee8f | 2068 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
2069 | } |
2070 | ||
2071 | /** | |
2072 | * smack_flags_to_may - convert S_ to MAY_ values | |
2073 | * @flags: the S_ value | |
2074 | * | |
2075 | * Returns the equivalent MAY_ value | |
2076 | */ | |
2077 | static int smack_flags_to_may(int flags) | |
2078 | { | |
2079 | int may = 0; | |
2080 | ||
2081 | if (flags & S_IRUGO) | |
2082 | may |= MAY_READ; | |
2083 | if (flags & S_IWUGO) | |
2084 | may |= MAY_WRITE; | |
2085 | if (flags & S_IXUGO) | |
2086 | may |= MAY_EXEC; | |
2087 | ||
2088 | return may; | |
2089 | } | |
2090 | ||
2091 | /** | |
2092 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2093 | * @msg: the object | |
2094 | * | |
2095 | * Returns 0 | |
2096 | */ | |
2097 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2098 | { | |
676dac4b | 2099 | msg->security = smk_of_current(); |
e114e473 CS |
2100 | return 0; |
2101 | } | |
2102 | ||
2103 | /** | |
2104 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2105 | * @msg: the object | |
2106 | * | |
2107 | * Clears the blob pointer | |
2108 | */ | |
2109 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2110 | { | |
2111 | msg->security = NULL; | |
2112 | } | |
2113 | ||
2114 | /** | |
2115 | * smack_of_shm - the smack pointer for the shm | |
2116 | * @shp: the object | |
2117 | * | |
2118 | * Returns a pointer to the smack value | |
2119 | */ | |
2120 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2121 | { | |
2122 | return (char *)shp->shm_perm.security; | |
2123 | } | |
2124 | ||
2125 | /** | |
2126 | * smack_shm_alloc_security - Set the security blob for shm | |
2127 | * @shp: the object | |
2128 | * | |
2129 | * Returns 0 | |
2130 | */ | |
2131 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2132 | { | |
2133 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2134 | ||
676dac4b | 2135 | isp->security = smk_of_current(); |
e114e473 CS |
2136 | return 0; |
2137 | } | |
2138 | ||
2139 | /** | |
2140 | * smack_shm_free_security - Clear the security blob for shm | |
2141 | * @shp: the object | |
2142 | * | |
2143 | * Clears the blob pointer | |
2144 | */ | |
2145 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2146 | { | |
2147 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2148 | ||
2149 | isp->security = NULL; | |
2150 | } | |
2151 | ||
ecfcc53f EB |
2152 | /** |
2153 | * smk_curacc_shm : check if current has access on shm | |
2154 | * @shp : the object | |
2155 | * @access : access requested | |
2156 | * | |
2157 | * Returns 0 if current has the requested access, error code otherwise | |
2158 | */ | |
2159 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2160 | { | |
2161 | char *ssp = smack_of_shm(shp); | |
2162 | struct smk_audit_info ad; | |
2163 | ||
2164 | #ifdef CONFIG_AUDIT | |
2165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2166 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2167 | #endif | |
2168 | return smk_curacc(ssp, access, &ad); | |
2169 | } | |
2170 | ||
e114e473 CS |
2171 | /** |
2172 | * smack_shm_associate - Smack access check for shm | |
2173 | * @shp: the object | |
2174 | * @shmflg: access requested | |
2175 | * | |
2176 | * Returns 0 if current has the requested access, error code otherwise | |
2177 | */ | |
2178 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2179 | { | |
e114e473 CS |
2180 | int may; |
2181 | ||
2182 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2183 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2184 | } |
2185 | ||
2186 | /** | |
2187 | * smack_shm_shmctl - Smack access check for shm | |
2188 | * @shp: the object | |
2189 | * @cmd: what it wants to do | |
2190 | * | |
2191 | * Returns 0 if current has the requested access, error code otherwise | |
2192 | */ | |
2193 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2194 | { | |
e114e473 CS |
2195 | int may; |
2196 | ||
2197 | switch (cmd) { | |
2198 | case IPC_STAT: | |
2199 | case SHM_STAT: | |
2200 | may = MAY_READ; | |
2201 | break; | |
2202 | case IPC_SET: | |
2203 | case SHM_LOCK: | |
2204 | case SHM_UNLOCK: | |
2205 | case IPC_RMID: | |
2206 | may = MAY_READWRITE; | |
2207 | break; | |
2208 | case IPC_INFO: | |
2209 | case SHM_INFO: | |
2210 | /* | |
2211 | * System level information. | |
2212 | */ | |
2213 | return 0; | |
2214 | default: | |
2215 | return -EINVAL; | |
2216 | } | |
ecfcc53f | 2217 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2218 | } |
2219 | ||
2220 | /** | |
2221 | * smack_shm_shmat - Smack access for shmat | |
2222 | * @shp: the object | |
2223 | * @shmaddr: unused | |
2224 | * @shmflg: access requested | |
2225 | * | |
2226 | * Returns 0 if current has the requested access, error code otherwise | |
2227 | */ | |
2228 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2229 | int shmflg) | |
2230 | { | |
e114e473 CS |
2231 | int may; |
2232 | ||
2233 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2234 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2235 | } |
2236 | ||
2237 | /** | |
2238 | * smack_of_sem - the smack pointer for the sem | |
2239 | * @sma: the object | |
2240 | * | |
2241 | * Returns a pointer to the smack value | |
2242 | */ | |
2243 | static char *smack_of_sem(struct sem_array *sma) | |
2244 | { | |
2245 | return (char *)sma->sem_perm.security; | |
2246 | } | |
2247 | ||
2248 | /** | |
2249 | * smack_sem_alloc_security - Set the security blob for sem | |
2250 | * @sma: the object | |
2251 | * | |
2252 | * Returns 0 | |
2253 | */ | |
2254 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2255 | { | |
2256 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2257 | ||
676dac4b | 2258 | isp->security = smk_of_current(); |
e114e473 CS |
2259 | return 0; |
2260 | } | |
2261 | ||
2262 | /** | |
2263 | * smack_sem_free_security - Clear the security blob for sem | |
2264 | * @sma: the object | |
2265 | * | |
2266 | * Clears the blob pointer | |
2267 | */ | |
2268 | static void smack_sem_free_security(struct sem_array *sma) | |
2269 | { | |
2270 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2271 | ||
2272 | isp->security = NULL; | |
2273 | } | |
2274 | ||
ecfcc53f EB |
2275 | /** |
2276 | * smk_curacc_sem : check if current has access on sem | |
2277 | * @sma : the object | |
2278 | * @access : access requested | |
2279 | * | |
2280 | * Returns 0 if current has the requested access, error code otherwise | |
2281 | */ | |
2282 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2283 | { | |
2284 | char *ssp = smack_of_sem(sma); | |
2285 | struct smk_audit_info ad; | |
2286 | ||
2287 | #ifdef CONFIG_AUDIT | |
2288 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2289 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2290 | #endif | |
2291 | return smk_curacc(ssp, access, &ad); | |
2292 | } | |
2293 | ||
e114e473 CS |
2294 | /** |
2295 | * smack_sem_associate - Smack access check for sem | |
2296 | * @sma: the object | |
2297 | * @semflg: access requested | |
2298 | * | |
2299 | * Returns 0 if current has the requested access, error code otherwise | |
2300 | */ | |
2301 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2302 | { | |
e114e473 CS |
2303 | int may; |
2304 | ||
2305 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2306 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2307 | } |
2308 | ||
2309 | /** | |
2310 | * smack_sem_shmctl - Smack access check for sem | |
2311 | * @sma: the object | |
2312 | * @cmd: what it wants to do | |
2313 | * | |
2314 | * Returns 0 if current has the requested access, error code otherwise | |
2315 | */ | |
2316 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2317 | { | |
e114e473 CS |
2318 | int may; |
2319 | ||
2320 | switch (cmd) { | |
2321 | case GETPID: | |
2322 | case GETNCNT: | |
2323 | case GETZCNT: | |
2324 | case GETVAL: | |
2325 | case GETALL: | |
2326 | case IPC_STAT: | |
2327 | case SEM_STAT: | |
2328 | may = MAY_READ; | |
2329 | break; | |
2330 | case SETVAL: | |
2331 | case SETALL: | |
2332 | case IPC_RMID: | |
2333 | case IPC_SET: | |
2334 | may = MAY_READWRITE; | |
2335 | break; | |
2336 | case IPC_INFO: | |
2337 | case SEM_INFO: | |
2338 | /* | |
2339 | * System level information | |
2340 | */ | |
2341 | return 0; | |
2342 | default: | |
2343 | return -EINVAL; | |
2344 | } | |
2345 | ||
ecfcc53f | 2346 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2347 | } |
2348 | ||
2349 | /** | |
2350 | * smack_sem_semop - Smack checks of semaphore operations | |
2351 | * @sma: the object | |
2352 | * @sops: unused | |
2353 | * @nsops: unused | |
2354 | * @alter: unused | |
2355 | * | |
2356 | * Treated as read and write in all cases. | |
2357 | * | |
2358 | * Returns 0 if access is allowed, error code otherwise | |
2359 | */ | |
2360 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2361 | unsigned nsops, int alter) | |
2362 | { | |
ecfcc53f | 2363 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2364 | } |
2365 | ||
2366 | /** | |
2367 | * smack_msg_alloc_security - Set the security blob for msg | |
2368 | * @msq: the object | |
2369 | * | |
2370 | * Returns 0 | |
2371 | */ | |
2372 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2373 | { | |
2374 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2375 | ||
676dac4b | 2376 | kisp->security = smk_of_current(); |
e114e473 CS |
2377 | return 0; |
2378 | } | |
2379 | ||
2380 | /** | |
2381 | * smack_msg_free_security - Clear the security blob for msg | |
2382 | * @msq: the object | |
2383 | * | |
2384 | * Clears the blob pointer | |
2385 | */ | |
2386 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2387 | { | |
2388 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2389 | ||
2390 | kisp->security = NULL; | |
2391 | } | |
2392 | ||
2393 | /** | |
2394 | * smack_of_msq - the smack pointer for the msq | |
2395 | * @msq: the object | |
2396 | * | |
2397 | * Returns a pointer to the smack value | |
2398 | */ | |
2399 | static char *smack_of_msq(struct msg_queue *msq) | |
2400 | { | |
2401 | return (char *)msq->q_perm.security; | |
2402 | } | |
2403 | ||
ecfcc53f EB |
2404 | /** |
2405 | * smk_curacc_msq : helper to check if current has access on msq | |
2406 | * @msq : the msq | |
2407 | * @access : access requested | |
2408 | * | |
2409 | * return 0 if current has access, error otherwise | |
2410 | */ | |
2411 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2412 | { | |
2413 | char *msp = smack_of_msq(msq); | |
2414 | struct smk_audit_info ad; | |
2415 | ||
2416 | #ifdef CONFIG_AUDIT | |
2417 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2418 | ad.a.u.ipc_id = msq->q_perm.id; | |
2419 | #endif | |
2420 | return smk_curacc(msp, access, &ad); | |
2421 | } | |
2422 | ||
e114e473 CS |
2423 | /** |
2424 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2425 | * @msq: the object | |
2426 | * @msqflg: access requested | |
2427 | * | |
2428 | * Returns 0 if current has the requested access, error code otherwise | |
2429 | */ | |
2430 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2431 | { | |
e114e473 CS |
2432 | int may; |
2433 | ||
2434 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2435 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2436 | } |
2437 | ||
2438 | /** | |
2439 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2440 | * @msq: the object | |
2441 | * @cmd: what it wants to do | |
2442 | * | |
2443 | * Returns 0 if current has the requested access, error code otherwise | |
2444 | */ | |
2445 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2446 | { | |
e114e473 CS |
2447 | int may; |
2448 | ||
2449 | switch (cmd) { | |
2450 | case IPC_STAT: | |
2451 | case MSG_STAT: | |
2452 | may = MAY_READ; | |
2453 | break; | |
2454 | case IPC_SET: | |
2455 | case IPC_RMID: | |
2456 | may = MAY_READWRITE; | |
2457 | break; | |
2458 | case IPC_INFO: | |
2459 | case MSG_INFO: | |
2460 | /* | |
2461 | * System level information | |
2462 | */ | |
2463 | return 0; | |
2464 | default: | |
2465 | return -EINVAL; | |
2466 | } | |
2467 | ||
ecfcc53f | 2468 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2469 | } |
2470 | ||
2471 | /** | |
2472 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2473 | * @msq: the object | |
2474 | * @msg: unused | |
2475 | * @msqflg: access requested | |
2476 | * | |
2477 | * Returns 0 if current has the requested access, error code otherwise | |
2478 | */ | |
2479 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2480 | int msqflg) | |
2481 | { | |
ecfcc53f | 2482 | int may; |
e114e473 | 2483 | |
ecfcc53f EB |
2484 | may = smack_flags_to_may(msqflg); |
2485 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2486 | } |
2487 | ||
2488 | /** | |
2489 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2490 | * @msq: the object | |
2491 | * @msg: unused | |
2492 | * @target: unused | |
2493 | * @type: unused | |
2494 | * @mode: unused | |
2495 | * | |
2496 | * Returns 0 if current has read and write access, error code otherwise | |
2497 | */ | |
2498 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2499 | struct task_struct *target, long type, int mode) | |
2500 | { | |
ecfcc53f | 2501 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2502 | } |
2503 | ||
2504 | /** | |
2505 | * smack_ipc_permission - Smack access for ipc_permission() | |
2506 | * @ipp: the object permissions | |
2507 | * @flag: access requested | |
2508 | * | |
2509 | * Returns 0 if current has read and write access, error code otherwise | |
2510 | */ | |
2511 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2512 | { | |
2513 | char *isp = ipp->security; | |
ecfcc53f EB |
2514 | int may = smack_flags_to_may(flag); |
2515 | struct smk_audit_info ad; | |
e114e473 | 2516 | |
ecfcc53f EB |
2517 | #ifdef CONFIG_AUDIT |
2518 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2519 | ad.a.u.ipc_id = ipp->id; | |
2520 | #endif | |
2521 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2522 | } |
2523 | ||
d20bdda6 AD |
2524 | /** |
2525 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2526 | * @ipp: the object permissions |
d20bdda6 AD |
2527 | * @secid: where result will be saved |
2528 | */ | |
2529 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2530 | { | |
2531 | char *smack = ipp->security; | |
2532 | ||
2533 | *secid = smack_to_secid(smack); | |
2534 | } | |
2535 | ||
e114e473 CS |
2536 | /** |
2537 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2538 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2539 | * @inode: the object |
2540 | * | |
2541 | * Set the inode's security blob if it hasn't been done already. | |
2542 | */ | |
2543 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2544 | { | |
2545 | struct super_block *sbp; | |
2546 | struct superblock_smack *sbsp; | |
2547 | struct inode_smack *isp; | |
676dac4b | 2548 | char *csp = smk_of_current(); |
e114e473 CS |
2549 | char *fetched; |
2550 | char *final; | |
5c6d1125 JS |
2551 | char trattr[TRANS_TRUE_SIZE]; |
2552 | int transflag = 0; | |
e114e473 CS |
2553 | struct dentry *dp; |
2554 | ||
2555 | if (inode == NULL) | |
2556 | return; | |
2557 | ||
2558 | isp = inode->i_security; | |
2559 | ||
2560 | mutex_lock(&isp->smk_lock); | |
2561 | /* | |
2562 | * If the inode is already instantiated | |
2563 | * take the quick way out | |
2564 | */ | |
2565 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2566 | goto unlockandout; | |
2567 | ||
2568 | sbp = inode->i_sb; | |
2569 | sbsp = sbp->s_security; | |
2570 | /* | |
2571 | * We're going to use the superblock default label | |
2572 | * if there's no label on the file. | |
2573 | */ | |
2574 | final = sbsp->smk_default; | |
2575 | ||
e97dcb0e CS |
2576 | /* |
2577 | * If this is the root inode the superblock | |
2578 | * may be in the process of initialization. | |
2579 | * If that is the case use the root value out | |
2580 | * of the superblock. | |
2581 | */ | |
2582 | if (opt_dentry->d_parent == opt_dentry) { | |
2583 | isp->smk_inode = sbsp->smk_root; | |
2584 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2585 | goto unlockandout; | |
2586 | } | |
2587 | ||
e114e473 CS |
2588 | /* |
2589 | * This is pretty hackish. | |
2590 | * Casey says that we shouldn't have to do | |
2591 | * file system specific code, but it does help | |
2592 | * with keeping it simple. | |
2593 | */ | |
2594 | switch (sbp->s_magic) { | |
2595 | case SMACK_MAGIC: | |
2596 | /* | |
25985edc | 2597 | * Casey says that it's a little embarrassing |
e114e473 CS |
2598 | * that the smack file system doesn't do |
2599 | * extended attributes. | |
2600 | */ | |
2601 | final = smack_known_star.smk_known; | |
2602 | break; | |
2603 | case PIPEFS_MAGIC: | |
2604 | /* | |
2605 | * Casey says pipes are easy (?) | |
2606 | */ | |
2607 | final = smack_known_star.smk_known; | |
2608 | break; | |
2609 | case DEVPTS_SUPER_MAGIC: | |
2610 | /* | |
2611 | * devpts seems content with the label of the task. | |
2612 | * Programs that change smack have to treat the | |
2613 | * pty with respect. | |
2614 | */ | |
2615 | final = csp; | |
2616 | break; | |
2617 | case SOCKFS_MAGIC: | |
2618 | /* | |
b4e0d5f0 CS |
2619 | * Socket access is controlled by the socket |
2620 | * structures associated with the task involved. | |
e114e473 | 2621 | */ |
b4e0d5f0 | 2622 | final = smack_known_star.smk_known; |
e114e473 CS |
2623 | break; |
2624 | case PROC_SUPER_MAGIC: | |
2625 | /* | |
2626 | * Casey says procfs appears not to care. | |
2627 | * The superblock default suffices. | |
2628 | */ | |
2629 | break; | |
2630 | case TMPFS_MAGIC: | |
2631 | /* | |
2632 | * Device labels should come from the filesystem, | |
2633 | * but watch out, because they're volitile, | |
2634 | * getting recreated on every reboot. | |
2635 | */ | |
2636 | final = smack_known_star.smk_known; | |
2637 | /* | |
2638 | * No break. | |
2639 | * | |
2640 | * If a smack value has been set we want to use it, | |
2641 | * but since tmpfs isn't giving us the opportunity | |
2642 | * to set mount options simulate setting the | |
2643 | * superblock default. | |
2644 | */ | |
2645 | default: | |
2646 | /* | |
2647 | * This isn't an understood special case. | |
2648 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2649 | */ |
2650 | ||
2651 | /* | |
2652 | * UNIX domain sockets use lower level socket data. | |
2653 | */ | |
2654 | if (S_ISSOCK(inode->i_mode)) { | |
2655 | final = smack_known_star.smk_known; | |
2656 | break; | |
2657 | } | |
2658 | /* | |
e114e473 CS |
2659 | * No xattr support means, alas, no SMACK label. |
2660 | * Use the aforeapplied default. | |
2661 | * It would be curious if the label of the task | |
2662 | * does not match that assigned. | |
2663 | */ | |
2664 | if (inode->i_op->getxattr == NULL) | |
2665 | break; | |
2666 | /* | |
2667 | * Get the dentry for xattr. | |
2668 | */ | |
3e62cbb8 | 2669 | dp = dget(opt_dentry); |
676dac4b | 2670 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
5c6d1125 | 2671 | if (fetched != NULL) { |
e114e473 | 2672 | final = fetched; |
5c6d1125 JS |
2673 | if (S_ISDIR(inode->i_mode)) { |
2674 | trattr[0] = '\0'; | |
2675 | inode->i_op->getxattr(dp, | |
2676 | XATTR_NAME_SMACKTRANSMUTE, | |
2677 | trattr, TRANS_TRUE_SIZE); | |
2678 | if (strncmp(trattr, TRANS_TRUE, | |
2679 | TRANS_TRUE_SIZE) == 0) | |
2680 | transflag = SMK_INODE_TRANSMUTE; | |
2681 | } | |
2682 | } | |
2683 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2684 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2685 | |
e114e473 CS |
2686 | dput(dp); |
2687 | break; | |
2688 | } | |
2689 | ||
2690 | if (final == NULL) | |
2691 | isp->smk_inode = csp; | |
2692 | else | |
2693 | isp->smk_inode = final; | |
2694 | ||
5c6d1125 | 2695 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2696 | |
2697 | unlockandout: | |
2698 | mutex_unlock(&isp->smk_lock); | |
2699 | return; | |
2700 | } | |
2701 | ||
2702 | /** | |
2703 | * smack_getprocattr - Smack process attribute access | |
2704 | * @p: the object task | |
2705 | * @name: the name of the attribute in /proc/.../attr | |
2706 | * @value: where to put the result | |
2707 | * | |
2708 | * Places a copy of the task Smack into value | |
2709 | * | |
2710 | * Returns the length of the smack label or an error code | |
2711 | */ | |
2712 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2713 | { | |
2714 | char *cp; | |
2715 | int slen; | |
2716 | ||
2717 | if (strcmp(name, "current") != 0) | |
2718 | return -EINVAL; | |
2719 | ||
676dac4b | 2720 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2721 | if (cp == NULL) |
2722 | return -ENOMEM; | |
2723 | ||
2724 | slen = strlen(cp); | |
2725 | *value = cp; | |
2726 | return slen; | |
2727 | } | |
2728 | ||
2729 | /** | |
2730 | * smack_setprocattr - Smack process attribute setting | |
2731 | * @p: the object task | |
2732 | * @name: the name of the attribute in /proc/.../attr | |
2733 | * @value: the value to set | |
2734 | * @size: the size of the value | |
2735 | * | |
2736 | * Sets the Smack value of the task. Only setting self | |
2737 | * is permitted and only with privilege | |
2738 | * | |
2739 | * Returns the length of the smack label or an error code | |
2740 | */ | |
2741 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2742 | void *value, size_t size) | |
2743 | { | |
7898e1f8 | 2744 | int rc; |
676dac4b | 2745 | struct task_smack *tsp; |
5c6d1125 | 2746 | struct task_smack *oldtsp; |
d84f4f99 | 2747 | struct cred *new; |
e114e473 CS |
2748 | char *newsmack; |
2749 | ||
e114e473 CS |
2750 | /* |
2751 | * Changing another process' Smack value is too dangerous | |
2752 | * and supports no sane use case. | |
2753 | */ | |
2754 | if (p != current) | |
2755 | return -EPERM; | |
2756 | ||
5cd9c58f DH |
2757 | if (!capable(CAP_MAC_ADMIN)) |
2758 | return -EPERM; | |
2759 | ||
e114e473 CS |
2760 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2761 | return -EINVAL; | |
2762 | ||
2763 | if (strcmp(name, "current") != 0) | |
2764 | return -EINVAL; | |
2765 | ||
2766 | newsmack = smk_import(value, size); | |
2767 | if (newsmack == NULL) | |
2768 | return -EINVAL; | |
2769 | ||
6d3dc07c CS |
2770 | /* |
2771 | * No process is ever allowed the web ("@") label. | |
2772 | */ | |
2773 | if (newsmack == smack_known_web.smk_known) | |
2774 | return -EPERM; | |
2775 | ||
5c6d1125 | 2776 | oldtsp = p->cred->security; |
d84f4f99 | 2777 | new = prepare_creds(); |
6d3dc07c | 2778 | if (new == NULL) |
d84f4f99 | 2779 | return -ENOMEM; |
7898e1f8 CS |
2780 | |
2781 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2782 | if (tsp == NULL) { |
2783 | kfree(new); | |
2784 | return -ENOMEM; | |
2785 | } | |
7898e1f8 CS |
2786 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2787 | if (rc != 0) | |
2788 | return rc; | |
2789 | ||
676dac4b | 2790 | new->security = tsp; |
d84f4f99 | 2791 | commit_creds(new); |
e114e473 CS |
2792 | return size; |
2793 | } | |
2794 | ||
2795 | /** | |
2796 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2797 | * @sock: one sock |
2798 | * @other: the other sock | |
e114e473 CS |
2799 | * @newsk: unused |
2800 | * | |
2801 | * Return 0 if a subject with the smack of sock could access | |
2802 | * an object with the smack of other, otherwise an error code | |
2803 | */ | |
3610cda5 DM |
2804 | static int smack_unix_stream_connect(struct sock *sock, |
2805 | struct sock *other, struct sock *newsk) | |
e114e473 | 2806 | { |
d2e7ad19 JM |
2807 | struct socket_smack *ssp = sock->sk_security; |
2808 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2809 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2810 | struct smk_audit_info ad; |
b4e0d5f0 | 2811 | int rc = 0; |
e114e473 | 2812 | |
ecfcc53f | 2813 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
3610cda5 | 2814 | smk_ad_setfield_u_net_sk(&ad, other); |
b4e0d5f0 CS |
2815 | |
2816 | if (!capable(CAP_MAC_OVERRIDE)) | |
2817 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2818 | ||
975d5e55 CS |
2819 | /* |
2820 | * Cross reference the peer labels for SO_PEERSEC. | |
2821 | */ | |
2822 | if (rc == 0) { | |
2823 | nsp->smk_packet = ssp->smk_out; | |
2824 | ssp->smk_packet = osp->smk_out; | |
2825 | } | |
2826 | ||
b4e0d5f0 | 2827 | return rc; |
e114e473 CS |
2828 | } |
2829 | ||
2830 | /** | |
2831 | * smack_unix_may_send - Smack access on UDS | |
2832 | * @sock: one socket | |
2833 | * @other: the other socket | |
2834 | * | |
2835 | * Return 0 if a subject with the smack of sock could access | |
2836 | * an object with the smack of other, otherwise an error code | |
2837 | */ | |
2838 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2839 | { | |
b4e0d5f0 CS |
2840 | struct socket_smack *ssp = sock->sk->sk_security; |
2841 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2842 | struct smk_audit_info ad; |
b4e0d5f0 | 2843 | int rc = 0; |
e114e473 | 2844 | |
ecfcc53f EB |
2845 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2846 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2847 | |
2848 | if (!capable(CAP_MAC_OVERRIDE)) | |
2849 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2850 | ||
2851 | return rc; | |
e114e473 CS |
2852 | } |
2853 | ||
6d3dc07c CS |
2854 | /** |
2855 | * smack_socket_sendmsg - Smack check based on destination host | |
2856 | * @sock: the socket | |
251a2a95 | 2857 | * @msg: the message |
6d3dc07c CS |
2858 | * @size: the size of the message |
2859 | * | |
2860 | * Return 0 if the current subject can write to the destination | |
2861 | * host. This is only a question if the destination is a single | |
2862 | * label host. | |
2863 | */ | |
2864 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2865 | int size) | |
2866 | { | |
2867 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2868 | |
2869 | /* | |
2870 | * Perfectly reasonable for this to be NULL | |
2871 | */ | |
da34d424 | 2872 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2873 | return 0; |
2874 | ||
07feee8f | 2875 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2876 | } |
2877 | ||
e114e473 | 2878 | /** |
251a2a95 | 2879 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 2880 | * @sap: netlabel secattr |
272cd7a8 | 2881 | * @ssp: socket security information |
e114e473 | 2882 | * |
272cd7a8 | 2883 | * Returns a pointer to a Smack label found on the label list. |
e114e473 | 2884 | */ |
272cd7a8 CS |
2885 | static char *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
2886 | struct socket_smack *ssp) | |
e114e473 | 2887 | { |
272cd7a8 | 2888 | struct smack_known *skp; |
e114e473 | 2889 | char smack[SMK_LABELLEN]; |
6d3dc07c | 2890 | char *sp; |
e114e473 CS |
2891 | int pcat; |
2892 | ||
6d3dc07c | 2893 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2894 | /* |
6d3dc07c | 2895 | * Looks like a CIPSO packet. |
e114e473 CS |
2896 | * If there are flags but no level netlabel isn't |
2897 | * behaving the way we expect it to. | |
2898 | * | |
6d3dc07c | 2899 | * Get the categories, if any |
e114e473 CS |
2900 | * Without guidance regarding the smack value |
2901 | * for the packet fall back on the network | |
2902 | * ambient value. | |
2903 | */ | |
6d3dc07c CS |
2904 | memset(smack, '\0', SMK_LABELLEN); |
2905 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2906 | for (pcat = -1;;) { | |
2907 | pcat = netlbl_secattr_catmap_walk( | |
2908 | sap->attr.mls.cat, pcat + 1); | |
2909 | if (pcat < 0) | |
2910 | break; | |
2911 | smack_catset_bit(pcat, smack); | |
2912 | } | |
2913 | /* | |
2914 | * If it is CIPSO using smack direct mapping | |
2915 | * we are already done. WeeHee. | |
2916 | */ | |
2917 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
272cd7a8 CS |
2918 | /* |
2919 | * The label sent is usually on the label list. | |
2920 | * | |
2921 | * If it is not we may still want to allow the | |
2922 | * delivery. | |
2923 | * | |
2924 | * If the recipient is accepting all packets | |
2925 | * because it is using the star ("*") label | |
2926 | * for SMACK64IPIN provide the web ("@") label | |
2927 | * so that a directed response will succeed. | |
2928 | * This is not very correct from a MAC point | |
2929 | * of view, but gets around the problem that | |
2930 | * locking prevents adding the newly discovered | |
2931 | * label to the list. | |
2932 | * The case where the recipient is not using | |
2933 | * the star label should obviously fail. | |
2934 | * The easy way to do this is to provide the | |
2935 | * star label as the subject label. | |
2936 | */ | |
2937 | skp = smk_find_entry(smack); | |
2938 | if (skp != NULL) | |
2939 | return skp->smk_known; | |
2940 | if (ssp != NULL && | |
2941 | ssp->smk_in == smack_known_star.smk_known) | |
2942 | return smack_known_web.smk_known; | |
2943 | return smack_known_star.smk_known; | |
6d3dc07c CS |
2944 | } |
2945 | /* | |
2946 | * Look it up in the supplied table if it is not | |
2947 | * a direct mapping. | |
2948 | */ | |
272cd7a8 CS |
2949 | sp = smack_from_cipso(sap->attr.mls.lvl, smack); |
2950 | if (sp != NULL) | |
2951 | return sp; | |
2952 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) | |
2953 | return smack_known_web.smk_known; | |
2954 | return smack_known_star.smk_known; | |
e114e473 | 2955 | } |
6d3dc07c CS |
2956 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2957 | /* | |
2958 | * Looks like a fallback, which gives us a secid. | |
2959 | */ | |
2960 | sp = smack_from_secid(sap->attr.secid); | |
2961 | /* | |
2962 | * This has got to be a bug because it is | |
2963 | * impossible to specify a fallback without | |
2964 | * specifying the label, which will ensure | |
2965 | * it has a secid, and the only way to get a | |
2966 | * secid is from a fallback. | |
2967 | */ | |
2968 | BUG_ON(sp == NULL); | |
272cd7a8 | 2969 | return sp; |
e114e473 CS |
2970 | } |
2971 | /* | |
6d3dc07c CS |
2972 | * Without guidance regarding the smack value |
2973 | * for the packet fall back on the network | |
2974 | * ambient value. | |
e114e473 | 2975 | */ |
272cd7a8 | 2976 | return smack_net_ambient; |
e114e473 CS |
2977 | } |
2978 | ||
2979 | /** | |
2980 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2981 | * @sk: socket | |
2982 | * @skb: packet | |
2983 | * | |
2984 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2985 | */ | |
2986 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2987 | { | |
2988 | struct netlbl_lsm_secattr secattr; | |
2989 | struct socket_smack *ssp = sk->sk_security; | |
6d3dc07c | 2990 | char *csp; |
e114e473 | 2991 | int rc; |
ecfcc53f | 2992 | struct smk_audit_info ad; |
e114e473 CS |
2993 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2994 | return 0; | |
2995 | ||
2996 | /* | |
2997 | * Translate what netlabel gave us. | |
2998 | */ | |
e114e473 | 2999 | netlbl_secattr_init(&secattr); |
6d3dc07c | 3000 | |
e114e473 | 3001 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
272cd7a8 CS |
3002 | if (rc == 0) |
3003 | csp = smack_from_secattr(&secattr, ssp); | |
3004 | else | |
6d3dc07c CS |
3005 | csp = smack_net_ambient; |
3006 | ||
e114e473 | 3007 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3008 | |
ecfcc53f EB |
3009 | #ifdef CONFIG_AUDIT |
3010 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3011 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 3012 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3013 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3014 | #endif | |
e114e473 CS |
3015 | /* |
3016 | * Receiving a packet requires that the other end | |
3017 | * be able to write here. Read access is not required. | |
3018 | * This is the simplist possible security model | |
3019 | * for networking. | |
3020 | */ | |
ecfcc53f | 3021 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
3022 | if (rc != 0) |
3023 | netlbl_skbuff_err(skb, rc, 0); | |
3024 | return rc; | |
e114e473 CS |
3025 | } |
3026 | ||
3027 | /** | |
3028 | * smack_socket_getpeersec_stream - pull in packet label | |
3029 | * @sock: the socket | |
3030 | * @optval: user's destination | |
3031 | * @optlen: size thereof | |
251a2a95 | 3032 | * @len: max thereof |
e114e473 CS |
3033 | * |
3034 | * returns zero on success, an error code otherwise | |
3035 | */ | |
3036 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3037 | char __user *optval, | |
3038 | int __user *optlen, unsigned len) | |
3039 | { | |
3040 | struct socket_smack *ssp; | |
272cd7a8 CS |
3041 | char *rcp = ""; |
3042 | int slen = 1; | |
e114e473 CS |
3043 | int rc = 0; |
3044 | ||
3045 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3046 | if (ssp->smk_packet != NULL) { |
3047 | rcp = ssp->smk_packet; | |
3048 | slen = strlen(rcp) + 1; | |
3049 | } | |
e114e473 CS |
3050 | |
3051 | if (slen > len) | |
3052 | rc = -ERANGE; | |
272cd7a8 | 3053 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3054 | rc = -EFAULT; |
3055 | ||
3056 | if (put_user(slen, optlen) != 0) | |
3057 | rc = -EFAULT; | |
3058 | ||
3059 | return rc; | |
3060 | } | |
3061 | ||
3062 | ||
3063 | /** | |
3064 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3065 | * @sock: the peer socket |
e114e473 CS |
3066 | * @skb: packet data |
3067 | * @secid: pointer to where to put the secid of the packet | |
3068 | * | |
3069 | * Sets the netlabel socket state on sk from parent | |
3070 | */ | |
3071 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3072 | struct sk_buff *skb, u32 *secid) | |
3073 | ||
3074 | { | |
3075 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 CS |
3076 | struct socket_smack *ssp = NULL; |
3077 | char *sp; | |
b4e0d5f0 CS |
3078 | int family = PF_UNSPEC; |
3079 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3080 | int rc; |
3081 | ||
b4e0d5f0 CS |
3082 | if (skb != NULL) { |
3083 | if (skb->protocol == htons(ETH_P_IP)) | |
3084 | family = PF_INET; | |
3085 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3086 | family = PF_INET6; | |
e114e473 | 3087 | } |
b4e0d5f0 CS |
3088 | if (family == PF_UNSPEC && sock != NULL) |
3089 | family = sock->sk->sk_family; | |
e114e473 | 3090 | |
b4e0d5f0 | 3091 | if (family == PF_UNIX) { |
272cd7a8 CS |
3092 | ssp = sock->sk->sk_security; |
3093 | s = smack_to_secid(ssp->smk_out); | |
b4e0d5f0 CS |
3094 | } else if (family == PF_INET || family == PF_INET6) { |
3095 | /* | |
3096 | * Translate what netlabel gave us. | |
3097 | */ | |
272cd7a8 CS |
3098 | if (sock != NULL && sock->sk != NULL) |
3099 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3100 | netlbl_secattr_init(&secattr); |
3101 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3102 | if (rc == 0) { | |
272cd7a8 CS |
3103 | sp = smack_from_secattr(&secattr, ssp); |
3104 | s = smack_to_secid(sp); | |
b4e0d5f0 CS |
3105 | } |
3106 | netlbl_secattr_destroy(&secattr); | |
3107 | } | |
3108 | *secid = s; | |
e114e473 CS |
3109 | if (s == 0) |
3110 | return -EINVAL; | |
e114e473 CS |
3111 | return 0; |
3112 | } | |
3113 | ||
3114 | /** | |
07feee8f PM |
3115 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3116 | * @sk: child sock | |
3117 | * @parent: parent socket | |
e114e473 | 3118 | * |
07feee8f PM |
3119 | * Set the smk_{in,out} state of an existing sock based on the process that |
3120 | * is creating the new socket. | |
e114e473 CS |
3121 | */ |
3122 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3123 | { | |
3124 | struct socket_smack *ssp; | |
e114e473 | 3125 | |
07feee8f PM |
3126 | if (sk == NULL || |
3127 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3128 | return; |
3129 | ||
3130 | ssp = sk->sk_security; | |
676dac4b | 3131 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3132 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3133 | } |
3134 | ||
3135 | /** | |
3136 | * smack_inet_conn_request - Smack access check on connect | |
3137 | * @sk: socket involved | |
3138 | * @skb: packet | |
3139 | * @req: unused | |
3140 | * | |
3141 | * Returns 0 if a task with the packet label could write to | |
3142 | * the socket, otherwise an error code | |
3143 | */ | |
3144 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3145 | struct request_sock *req) | |
3146 | { | |
07feee8f | 3147 | u16 family = sk->sk_family; |
e114e473 | 3148 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3149 | struct netlbl_lsm_secattr secattr; |
3150 | struct sockaddr_in addr; | |
3151 | struct iphdr *hdr; | |
272cd7a8 | 3152 | char *sp; |
e114e473 | 3153 | int rc; |
ecfcc53f | 3154 | struct smk_audit_info ad; |
e114e473 | 3155 | |
07feee8f PM |
3156 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3157 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3158 | family = PF_INET; | |
e114e473 | 3159 | |
07feee8f PM |
3160 | netlbl_secattr_init(&secattr); |
3161 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3162 | if (rc == 0) |
272cd7a8 | 3163 | sp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3164 | else |
272cd7a8 | 3165 | sp = smack_known_huh.smk_known; |
07feee8f PM |
3166 | netlbl_secattr_destroy(&secattr); |
3167 | ||
ecfcc53f EB |
3168 | #ifdef CONFIG_AUDIT |
3169 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3170 | ad.a.u.net.family = family; | |
8964be4a | 3171 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3172 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3173 | #endif | |
e114e473 | 3174 | /* |
07feee8f PM |
3175 | * Receiving a packet requires that the other end be able to write |
3176 | * here. Read access is not required. | |
e114e473 | 3177 | */ |
272cd7a8 | 3178 | rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3179 | if (rc != 0) |
3180 | return rc; | |
3181 | ||
3182 | /* | |
3183 | * Save the peer's label in the request_sock so we can later setup | |
3184 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3185 | */ | |
272cd7a8 | 3186 | req->peer_secid = smack_to_secid(sp); |
07feee8f PM |
3187 | |
3188 | /* | |
3189 | * We need to decide if we want to label the incoming connection here | |
3190 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3191 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3192 | */ |
3193 | hdr = ip_hdr(skb); | |
3194 | addr.sin_addr.s_addr = hdr->saddr; | |
3195 | rcu_read_lock(); | |
3196 | if (smack_host_label(&addr) == NULL) { | |
3197 | rcu_read_unlock(); | |
3198 | netlbl_secattr_init(&secattr); | |
272cd7a8 | 3199 | smack_to_secattr(sp, &secattr); |
07feee8f PM |
3200 | rc = netlbl_req_setattr(req, &secattr); |
3201 | netlbl_secattr_destroy(&secattr); | |
3202 | } else { | |
3203 | rcu_read_unlock(); | |
3204 | netlbl_req_delattr(req); | |
3205 | } | |
e114e473 CS |
3206 | |
3207 | return rc; | |
3208 | } | |
3209 | ||
07feee8f PM |
3210 | /** |
3211 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3212 | * @sk: the new socket | |
3213 | * @req: the connection's request_sock | |
3214 | * | |
3215 | * Transfer the connection's peer label to the newly created socket. | |
3216 | */ | |
3217 | static void smack_inet_csk_clone(struct sock *sk, | |
3218 | const struct request_sock *req) | |
3219 | { | |
3220 | struct socket_smack *ssp = sk->sk_security; | |
07feee8f | 3221 | |
272cd7a8 CS |
3222 | if (req->peer_secid != 0) |
3223 | ssp->smk_packet = smack_from_secid(req->peer_secid); | |
3224 | else | |
3225 | ssp->smk_packet = NULL; | |
07feee8f PM |
3226 | } |
3227 | ||
e114e473 CS |
3228 | /* |
3229 | * Key management security hooks | |
3230 | * | |
3231 | * Casey has not tested key support very heavily. | |
3232 | * The permission check is most likely too restrictive. | |
3233 | * If you care about keys please have a look. | |
3234 | */ | |
3235 | #ifdef CONFIG_KEYS | |
3236 | ||
3237 | /** | |
3238 | * smack_key_alloc - Set the key security blob | |
3239 | * @key: object | |
d84f4f99 | 3240 | * @cred: the credentials to use |
e114e473 CS |
3241 | * @flags: unused |
3242 | * | |
3243 | * No allocation required | |
3244 | * | |
3245 | * Returns 0 | |
3246 | */ | |
d84f4f99 | 3247 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3248 | unsigned long flags) |
3249 | { | |
676dac4b | 3250 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3251 | return 0; |
3252 | } | |
3253 | ||
3254 | /** | |
3255 | * smack_key_free - Clear the key security blob | |
3256 | * @key: the object | |
3257 | * | |
3258 | * Clear the blob pointer | |
3259 | */ | |
3260 | static void smack_key_free(struct key *key) | |
3261 | { | |
3262 | key->security = NULL; | |
3263 | } | |
3264 | ||
3265 | /* | |
3266 | * smack_key_permission - Smack access on a key | |
3267 | * @key_ref: gets to the object | |
d84f4f99 | 3268 | * @cred: the credentials to use |
e114e473 CS |
3269 | * @perm: unused |
3270 | * | |
3271 | * Return 0 if the task has read and write to the object, | |
3272 | * an error code otherwise | |
3273 | */ | |
3274 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3275 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3276 | { |
3277 | struct key *keyp; | |
ecfcc53f | 3278 | struct smk_audit_info ad; |
676dac4b | 3279 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3280 | |
3281 | keyp = key_ref_to_ptr(key_ref); | |
3282 | if (keyp == NULL) | |
3283 | return -EINVAL; | |
3284 | /* | |
3285 | * If the key hasn't been initialized give it access so that | |
3286 | * it may do so. | |
3287 | */ | |
3288 | if (keyp->security == NULL) | |
3289 | return 0; | |
3290 | /* | |
3291 | * This should not occur | |
3292 | */ | |
676dac4b | 3293 | if (tsp == NULL) |
e114e473 | 3294 | return -EACCES; |
ecfcc53f EB |
3295 | #ifdef CONFIG_AUDIT |
3296 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3297 | ad.a.u.key_struct.key = keyp->serial; | |
3298 | ad.a.u.key_struct.key_desc = keyp->description; | |
3299 | #endif | |
676dac4b | 3300 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3301 | MAY_READWRITE, &ad); |
e114e473 CS |
3302 | } |
3303 | #endif /* CONFIG_KEYS */ | |
3304 | ||
d20bdda6 AD |
3305 | /* |
3306 | * Smack Audit hooks | |
3307 | * | |
3308 | * Audit requires a unique representation of each Smack specific | |
3309 | * rule. This unique representation is used to distinguish the | |
3310 | * object to be audited from remaining kernel objects and also | |
3311 | * works as a glue between the audit hooks. | |
3312 | * | |
3313 | * Since repository entries are added but never deleted, we'll use | |
3314 | * the smack_known label address related to the given audit rule as | |
3315 | * the needed unique representation. This also better fits the smack | |
3316 | * model where nearly everything is a label. | |
3317 | */ | |
3318 | #ifdef CONFIG_AUDIT | |
3319 | ||
3320 | /** | |
3321 | * smack_audit_rule_init - Initialize a smack audit rule | |
3322 | * @field: audit rule fields given from user-space (audit.h) | |
3323 | * @op: required testing operator (=, !=, >, <, ...) | |
3324 | * @rulestr: smack label to be audited | |
3325 | * @vrule: pointer to save our own audit rule representation | |
3326 | * | |
3327 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3328 | * The label to be audited is created if necessay. | |
3329 | */ | |
3330 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3331 | { | |
3332 | char **rule = (char **)vrule; | |
3333 | *rule = NULL; | |
3334 | ||
3335 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3336 | return -EINVAL; | |
3337 | ||
5af75d8d | 3338 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3339 | return -EINVAL; |
3340 | ||
3341 | *rule = smk_import(rulestr, 0); | |
3342 | ||
3343 | return 0; | |
3344 | } | |
3345 | ||
3346 | /** | |
3347 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3348 | * @krule: rule of interest, in Audit kernel representation format | |
3349 | * | |
3350 | * This is used to filter Smack rules from remaining Audit ones. | |
3351 | * If it's proved that this rule belongs to us, the | |
3352 | * audit_rule_match hook will be called to do the final judgement. | |
3353 | */ | |
3354 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3355 | { | |
3356 | struct audit_field *f; | |
3357 | int i; | |
3358 | ||
3359 | for (i = 0; i < krule->field_count; i++) { | |
3360 | f = &krule->fields[i]; | |
3361 | ||
3362 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3363 | return 1; | |
3364 | } | |
3365 | ||
3366 | return 0; | |
3367 | } | |
3368 | ||
3369 | /** | |
3370 | * smack_audit_rule_match - Audit given object ? | |
3371 | * @secid: security id for identifying the object to test | |
3372 | * @field: audit rule flags given from user-space | |
3373 | * @op: required testing operator | |
3374 | * @vrule: smack internal rule presentation | |
3375 | * @actx: audit context associated with the check | |
3376 | * | |
3377 | * The core Audit hook. It's used to take the decision of | |
3378 | * whether to audit or not to audit a given object. | |
3379 | */ | |
3380 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3381 | struct audit_context *actx) | |
3382 | { | |
3383 | char *smack; | |
3384 | char *rule = vrule; | |
3385 | ||
3386 | if (!rule) { | |
3387 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
3388 | "Smack: missing rule\n"); | |
3389 | return -ENOENT; | |
3390 | } | |
3391 | ||
3392 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3393 | return 0; | |
3394 | ||
3395 | smack = smack_from_secid(secid); | |
3396 | ||
3397 | /* | |
3398 | * No need to do string comparisons. If a match occurs, | |
3399 | * both pointers will point to the same smack_known | |
3400 | * label. | |
3401 | */ | |
5af75d8d | 3402 | if (op == Audit_equal) |
d20bdda6 | 3403 | return (rule == smack); |
5af75d8d | 3404 | if (op == Audit_not_equal) |
d20bdda6 AD |
3405 | return (rule != smack); |
3406 | ||
3407 | return 0; | |
3408 | } | |
3409 | ||
3410 | /** | |
3411 | * smack_audit_rule_free - free smack rule representation | |
3412 | * @vrule: rule to be freed. | |
3413 | * | |
3414 | * No memory was allocated. | |
3415 | */ | |
3416 | static void smack_audit_rule_free(void *vrule) | |
3417 | { | |
3418 | /* No-op */ | |
3419 | } | |
3420 | ||
3421 | #endif /* CONFIG_AUDIT */ | |
3422 | ||
251a2a95 | 3423 | /** |
e114e473 CS |
3424 | * smack_secid_to_secctx - return the smack label for a secid |
3425 | * @secid: incoming integer | |
3426 | * @secdata: destination | |
3427 | * @seclen: how long it is | |
3428 | * | |
3429 | * Exists for networking code. | |
3430 | */ | |
3431 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3432 | { | |
3433 | char *sp = smack_from_secid(secid); | |
3434 | ||
d5630b9d EP |
3435 | if (secdata) |
3436 | *secdata = sp; | |
e114e473 CS |
3437 | *seclen = strlen(sp); |
3438 | return 0; | |
3439 | } | |
3440 | ||
251a2a95 | 3441 | /** |
4bc87e62 CS |
3442 | * smack_secctx_to_secid - return the secid for a smack label |
3443 | * @secdata: smack label | |
3444 | * @seclen: how long result is | |
3445 | * @secid: outgoing integer | |
3446 | * | |
3447 | * Exists for audit and networking code. | |
3448 | */ | |
e52c1764 | 3449 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3450 | { |
3451 | *secid = smack_to_secid(secdata); | |
3452 | return 0; | |
3453 | } | |
3454 | ||
251a2a95 | 3455 | /** |
e114e473 | 3456 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3457 | * @secdata: unused |
3458 | * @seclen: unused | |
e114e473 CS |
3459 | * |
3460 | * Exists to make sure nothing gets done, and properly | |
3461 | */ | |
3462 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3463 | { | |
3464 | } | |
3465 | ||
1ee65e37 DQ |
3466 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3467 | { | |
3468 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3469 | } | |
3470 | ||
3471 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3472 | { | |
3473 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3474 | } | |
3475 | ||
3476 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3477 | { | |
3478 | int len = 0; | |
3479 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3480 | ||
3481 | if (len < 0) | |
3482 | return len; | |
3483 | *ctxlen = len; | |
3484 | return 0; | |
3485 | } | |
3486 | ||
076c54c5 AD |
3487 | struct security_operations smack_ops = { |
3488 | .name = "smack", | |
3489 | ||
9e48858f | 3490 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3491 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3492 | .syslog = smack_syslog, |
e114e473 CS |
3493 | |
3494 | .sb_alloc_security = smack_sb_alloc_security, | |
3495 | .sb_free_security = smack_sb_free_security, | |
3496 | .sb_copy_data = smack_sb_copy_data, | |
3497 | .sb_kern_mount = smack_sb_kern_mount, | |
3498 | .sb_statfs = smack_sb_statfs, | |
3499 | .sb_mount = smack_sb_mount, | |
3500 | .sb_umount = smack_sb_umount, | |
3501 | ||
676dac4b | 3502 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3503 | .bprm_committing_creds = smack_bprm_committing_creds, |
3504 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3505 | |
e114e473 CS |
3506 | .inode_alloc_security = smack_inode_alloc_security, |
3507 | .inode_free_security = smack_inode_free_security, | |
3508 | .inode_init_security = smack_inode_init_security, | |
3509 | .inode_link = smack_inode_link, | |
3510 | .inode_unlink = smack_inode_unlink, | |
3511 | .inode_rmdir = smack_inode_rmdir, | |
3512 | .inode_rename = smack_inode_rename, | |
3513 | .inode_permission = smack_inode_permission, | |
3514 | .inode_setattr = smack_inode_setattr, | |
3515 | .inode_getattr = smack_inode_getattr, | |
3516 | .inode_setxattr = smack_inode_setxattr, | |
3517 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3518 | .inode_getxattr = smack_inode_getxattr, | |
3519 | .inode_removexattr = smack_inode_removexattr, | |
3520 | .inode_getsecurity = smack_inode_getsecurity, | |
3521 | .inode_setsecurity = smack_inode_setsecurity, | |
3522 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3523 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3524 | |
3525 | .file_permission = smack_file_permission, | |
3526 | .file_alloc_security = smack_file_alloc_security, | |
3527 | .file_free_security = smack_file_free_security, | |
3528 | .file_ioctl = smack_file_ioctl, | |
3529 | .file_lock = smack_file_lock, | |
3530 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3531 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3532 | .file_set_fowner = smack_file_set_fowner, |
3533 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3534 | .file_receive = smack_file_receive, | |
3535 | ||
531f1d45 CS |
3536 | .dentry_open = smack_dentry_open, |
3537 | ||
ee18d64c | 3538 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3539 | .cred_free = smack_cred_free, |
d84f4f99 | 3540 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3541 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3542 | .kernel_act_as = smack_kernel_act_as, |
3543 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3544 | .task_setpgid = smack_task_setpgid, |
3545 | .task_getpgid = smack_task_getpgid, | |
3546 | .task_getsid = smack_task_getsid, | |
3547 | .task_getsecid = smack_task_getsecid, | |
3548 | .task_setnice = smack_task_setnice, | |
3549 | .task_setioprio = smack_task_setioprio, | |
3550 | .task_getioprio = smack_task_getioprio, | |
3551 | .task_setscheduler = smack_task_setscheduler, | |
3552 | .task_getscheduler = smack_task_getscheduler, | |
3553 | .task_movememory = smack_task_movememory, | |
3554 | .task_kill = smack_task_kill, | |
3555 | .task_wait = smack_task_wait, | |
e114e473 CS |
3556 | .task_to_inode = smack_task_to_inode, |
3557 | ||
3558 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3559 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3560 | |
3561 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3562 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3563 | ||
3564 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3565 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3566 | .msg_queue_associate = smack_msg_queue_associate, | |
3567 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3568 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3569 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3570 | ||
3571 | .shm_alloc_security = smack_shm_alloc_security, | |
3572 | .shm_free_security = smack_shm_free_security, | |
3573 | .shm_associate = smack_shm_associate, | |
3574 | .shm_shmctl = smack_shm_shmctl, | |
3575 | .shm_shmat = smack_shm_shmat, | |
3576 | ||
3577 | .sem_alloc_security = smack_sem_alloc_security, | |
3578 | .sem_free_security = smack_sem_free_security, | |
3579 | .sem_associate = smack_sem_associate, | |
3580 | .sem_semctl = smack_sem_semctl, | |
3581 | .sem_semop = smack_sem_semop, | |
3582 | ||
e114e473 CS |
3583 | .d_instantiate = smack_d_instantiate, |
3584 | ||
3585 | .getprocattr = smack_getprocattr, | |
3586 | .setprocattr = smack_setprocattr, | |
3587 | ||
3588 | .unix_stream_connect = smack_unix_stream_connect, | |
3589 | .unix_may_send = smack_unix_may_send, | |
3590 | ||
3591 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3592 | .socket_connect = smack_socket_connect, |
3593 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3594 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3595 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3596 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3597 | .sk_alloc_security = smack_sk_alloc_security, | |
3598 | .sk_free_security = smack_sk_free_security, | |
3599 | .sock_graft = smack_sock_graft, | |
3600 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3601 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3602 | |
e114e473 CS |
3603 | /* key management security hooks */ |
3604 | #ifdef CONFIG_KEYS | |
3605 | .key_alloc = smack_key_alloc, | |
3606 | .key_free = smack_key_free, | |
3607 | .key_permission = smack_key_permission, | |
3608 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3609 | |
3610 | /* Audit hooks */ | |
3611 | #ifdef CONFIG_AUDIT | |
3612 | .audit_rule_init = smack_audit_rule_init, | |
3613 | .audit_rule_known = smack_audit_rule_known, | |
3614 | .audit_rule_match = smack_audit_rule_match, | |
3615 | .audit_rule_free = smack_audit_rule_free, | |
3616 | #endif /* CONFIG_AUDIT */ | |
3617 | ||
e114e473 | 3618 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3619 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3620 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3621 | .inode_notifysecctx = smack_inode_notifysecctx, |
3622 | .inode_setsecctx = smack_inode_setsecctx, | |
3623 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3624 | }; |
3625 | ||
7198e2ee EB |
3626 | |
3627 | static __init void init_smack_know_list(void) | |
3628 | { | |
3629 | list_add(&smack_known_huh.list, &smack_known_list); | |
3630 | list_add(&smack_known_hat.list, &smack_known_list); | |
3631 | list_add(&smack_known_star.list, &smack_known_list); | |
3632 | list_add(&smack_known_floor.list, &smack_known_list); | |
3633 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3634 | list_add(&smack_known_web.list, &smack_known_list); | |
3635 | } | |
3636 | ||
e114e473 CS |
3637 | /** |
3638 | * smack_init - initialize the smack system | |
3639 | * | |
3640 | * Returns 0 | |
3641 | */ | |
3642 | static __init int smack_init(void) | |
3643 | { | |
d84f4f99 | 3644 | struct cred *cred; |
676dac4b | 3645 | struct task_smack *tsp; |
d84f4f99 | 3646 | |
7898e1f8 CS |
3647 | if (!security_module_enable(&smack_ops)) |
3648 | return 0; | |
3649 | ||
3650 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3651 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3652 | if (tsp == NULL) |
3653 | return -ENOMEM; | |
3654 | ||
e114e473 CS |
3655 | printk(KERN_INFO "Smack: Initializing.\n"); |
3656 | ||
3657 | /* | |
3658 | * Set the security state for the initial task. | |
3659 | */ | |
d84f4f99 | 3660 | cred = (struct cred *) current->cred; |
676dac4b | 3661 | cred->security = tsp; |
e114e473 | 3662 | |
421f91d2 | 3663 | /* initialize the smack_know_list */ |
7198e2ee | 3664 | init_smack_know_list(); |
e114e473 CS |
3665 | /* |
3666 | * Initialize locks | |
3667 | */ | |
e114e473 CS |
3668 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3669 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3670 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3671 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3672 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3673 | ||
3674 | /* | |
3675 | * Register with LSM | |
3676 | */ | |
3677 | if (register_security(&smack_ops)) | |
3678 | panic("smack: Unable to register with kernel.\n"); | |
3679 | ||
3680 | return 0; | |
3681 | } | |
3682 | ||
3683 | /* | |
3684 | * Smack requires early initialization in order to label | |
3685 | * all processes and objects when they are created. | |
3686 | */ | |
3687 | security_initcall(smack_init); |