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 | * | |
6 | * Author: | |
7 | * Casey Schaufler <casey@schaufler-ca.com> | |
8 | * | |
9 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f PM |
10 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
11 | * Paul Moore <paul.moore@hp.com> | |
e114e473 CS |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2, | |
15 | * as published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/xattr.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/stat.h> | |
e114e473 CS |
22 | #include <linux/kd.h> |
23 | #include <asm/ioctls.h> | |
07feee8f | 24 | #include <linux/ip.h> |
e114e473 CS |
25 | #include <linux/tcp.h> |
26 | #include <linux/udp.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
e114e473 CS |
28 | #include <linux/mutex.h> |
29 | #include <linux/pipe_fs_i.h> | |
30 | #include <net/netlabel.h> | |
31 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 32 | #include <linux/audit.h> |
1fd7317d | 33 | #include <linux/magic.h> |
e114e473 CS |
34 | #include "smack.h" |
35 | ||
c69e8d9c DH |
36 | #define task_security(task) (task_cred_xxx((task), security)) |
37 | ||
e114e473 CS |
38 | /** |
39 | * smk_fetch - Fetch the smack label from a file. | |
40 | * @ip: a pointer to the inode | |
41 | * @dp: a pointer to the dentry | |
42 | * | |
43 | * Returns a pointer to the master list entry for the Smack label | |
44 | * or NULL if there was no label to fetch. | |
45 | */ | |
46 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
47 | { | |
48 | int rc; | |
49 | char in[SMK_LABELLEN]; | |
50 | ||
51 | if (ip->i_op->getxattr == NULL) | |
52 | return NULL; | |
53 | ||
54 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
55 | if (rc < 0) | |
56 | return NULL; | |
57 | ||
58 | return smk_import(in, rc); | |
59 | } | |
60 | ||
61 | /** | |
62 | * new_inode_smack - allocate an inode security blob | |
63 | * @smack: a pointer to the Smack label to use in the blob | |
64 | * | |
65 | * Returns the new blob or NULL if there's no memory available | |
66 | */ | |
67 | struct inode_smack *new_inode_smack(char *smack) | |
68 | { | |
69 | struct inode_smack *isp; | |
70 | ||
71 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
72 | if (isp == NULL) | |
73 | return NULL; | |
74 | ||
75 | isp->smk_inode = smack; | |
76 | isp->smk_flags = 0; | |
77 | mutex_init(&isp->smk_lock); | |
78 | ||
79 | return isp; | |
80 | } | |
81 | ||
82 | /* | |
83 | * LSM hooks. | |
84 | * We he, that is fun! | |
85 | */ | |
86 | ||
87 | /** | |
9e48858f | 88 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 89 | * @ctp: child task pointer |
251a2a95 | 90 | * @mode: ptrace attachment mode |
e114e473 CS |
91 | * |
92 | * Returns 0 if access is OK, an error code otherwise | |
93 | * | |
94 | * Do the capability checks, and require read and write. | |
95 | */ | |
9e48858f | 96 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
97 | { |
98 | int rc; | |
ecfcc53f EB |
99 | struct smk_audit_info ad; |
100 | char *sp, *tsp; | |
e114e473 | 101 | |
9e48858f | 102 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
103 | if (rc != 0) |
104 | return rc; | |
105 | ||
ecfcc53f EB |
106 | sp = current_security(); |
107 | tsp = task_security(ctp); | |
108 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
109 | smk_ad_setfield_u_tsk(&ad, ctp); | |
110 | ||
111 | /* we won't log here, because rc can be overriden */ | |
112 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); | |
5cd9c58f | 113 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
114 | rc = 0; |
115 | ||
116 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); | |
5cd9c58f DH |
117 | return rc; |
118 | } | |
119 | ||
120 | /** | |
121 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
122 | * @ptp: parent task pointer | |
123 | * | |
124 | * Returns 0 if access is OK, an error code otherwise | |
125 | * | |
126 | * Do the capability checks, and require read and write. | |
127 | */ | |
128 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
129 | { | |
130 | int rc; | |
ecfcc53f EB |
131 | struct smk_audit_info ad; |
132 | char *sp, *tsp; | |
5cd9c58f DH |
133 | |
134 | rc = cap_ptrace_traceme(ptp); | |
135 | if (rc != 0) | |
136 | return rc; | |
e114e473 | 137 | |
ecfcc53f EB |
138 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
139 | smk_ad_setfield_u_tsk(&ad, ptp); | |
140 | ||
141 | sp = current_security(); | |
142 | tsp = task_security(ptp); | |
143 | /* we won't log here, because rc can be overriden */ | |
144 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); | |
5cd9c58f | 145 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
146 | rc = 0; |
147 | ||
148 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); | |
e114e473 CS |
149 | return rc; |
150 | } | |
151 | ||
152 | /** | |
153 | * smack_syslog - Smack approval on syslog | |
154 | * @type: message type | |
155 | * | |
156 | * Require that the task has the floor label | |
157 | * | |
158 | * Returns 0 on success, error code otherwise. | |
159 | */ | |
12b3052c | 160 | static int smack_syslog(int typefrom_file) |
e114e473 | 161 | { |
12b3052c | 162 | int rc = 0; |
86a264ab | 163 | char *sp = current_security(); |
e114e473 | 164 | |
e114e473 CS |
165 | if (capable(CAP_MAC_OVERRIDE)) |
166 | return 0; | |
167 | ||
168 | if (sp != smack_known_floor.smk_known) | |
169 | rc = -EACCES; | |
170 | ||
171 | return rc; | |
172 | } | |
173 | ||
174 | ||
175 | /* | |
176 | * Superblock Hooks. | |
177 | */ | |
178 | ||
179 | /** | |
180 | * smack_sb_alloc_security - allocate a superblock blob | |
181 | * @sb: the superblock getting the blob | |
182 | * | |
183 | * Returns 0 on success or -ENOMEM on error. | |
184 | */ | |
185 | static int smack_sb_alloc_security(struct super_block *sb) | |
186 | { | |
187 | struct superblock_smack *sbsp; | |
188 | ||
189 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
190 | ||
191 | if (sbsp == NULL) | |
192 | return -ENOMEM; | |
193 | ||
194 | sbsp->smk_root = smack_known_floor.smk_known; | |
195 | sbsp->smk_default = smack_known_floor.smk_known; | |
196 | sbsp->smk_floor = smack_known_floor.smk_known; | |
197 | sbsp->smk_hat = smack_known_hat.smk_known; | |
198 | sbsp->smk_initialized = 0; | |
199 | spin_lock_init(&sbsp->smk_sblock); | |
200 | ||
201 | sb->s_security = sbsp; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | /** | |
207 | * smack_sb_free_security - free a superblock blob | |
208 | * @sb: the superblock getting the blob | |
209 | * | |
210 | */ | |
211 | static void smack_sb_free_security(struct super_block *sb) | |
212 | { | |
213 | kfree(sb->s_security); | |
214 | sb->s_security = NULL; | |
215 | } | |
216 | ||
217 | /** | |
218 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 219 | * @orig: where to start |
251a2a95 | 220 | * @smackopts: mount options string |
e114e473 CS |
221 | * |
222 | * Returns 0 on success or -ENOMEM on error. | |
223 | * | |
224 | * Copy the Smack specific mount options out of the mount | |
225 | * options list. | |
226 | */ | |
e0007529 | 227 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
228 | { |
229 | char *cp, *commap, *otheropts, *dp; | |
230 | ||
e114e473 CS |
231 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
232 | if (otheropts == NULL) | |
233 | return -ENOMEM; | |
234 | ||
235 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
236 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
237 | dp = smackopts; | |
238 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
239 | dp = smackopts; | |
240 | else if (strstr(cp, SMK_FSHAT) == cp) | |
241 | dp = smackopts; | |
242 | else if (strstr(cp, SMK_FSROOT) == cp) | |
243 | dp = smackopts; | |
244 | else | |
245 | dp = otheropts; | |
246 | ||
247 | commap = strchr(cp, ','); | |
248 | if (commap != NULL) | |
249 | *commap = '\0'; | |
250 | ||
251 | if (*dp != '\0') | |
252 | strcat(dp, ","); | |
253 | strcat(dp, cp); | |
254 | } | |
255 | ||
256 | strcpy(orig, otheropts); | |
257 | free_page((unsigned long)otheropts); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | /** | |
263 | * smack_sb_kern_mount - Smack specific mount processing | |
264 | * @sb: the file system superblock | |
12204e24 | 265 | * @flags: the mount flags |
e114e473 CS |
266 | * @data: the smack mount options |
267 | * | |
268 | * Returns 0 on success, an error code on failure | |
269 | */ | |
12204e24 | 270 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
271 | { |
272 | struct dentry *root = sb->s_root; | |
273 | struct inode *inode = root->d_inode; | |
274 | struct superblock_smack *sp = sb->s_security; | |
275 | struct inode_smack *isp; | |
276 | char *op; | |
277 | char *commap; | |
278 | char *nsp; | |
279 | ||
280 | spin_lock(&sp->smk_sblock); | |
281 | if (sp->smk_initialized != 0) { | |
282 | spin_unlock(&sp->smk_sblock); | |
283 | return 0; | |
284 | } | |
285 | sp->smk_initialized = 1; | |
286 | spin_unlock(&sp->smk_sblock); | |
287 | ||
288 | for (op = data; op != NULL; op = commap) { | |
289 | commap = strchr(op, ','); | |
290 | if (commap != NULL) | |
291 | *commap++ = '\0'; | |
292 | ||
293 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
294 | op += strlen(SMK_FSHAT); | |
295 | nsp = smk_import(op, 0); | |
296 | if (nsp != NULL) | |
297 | sp->smk_hat = nsp; | |
298 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
299 | op += strlen(SMK_FSFLOOR); | |
300 | nsp = smk_import(op, 0); | |
301 | if (nsp != NULL) | |
302 | sp->smk_floor = nsp; | |
303 | } else if (strncmp(op, SMK_FSDEFAULT, | |
304 | strlen(SMK_FSDEFAULT)) == 0) { | |
305 | op += strlen(SMK_FSDEFAULT); | |
306 | nsp = smk_import(op, 0); | |
307 | if (nsp != NULL) | |
308 | sp->smk_default = nsp; | |
309 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
310 | op += strlen(SMK_FSROOT); | |
311 | nsp = smk_import(op, 0); | |
312 | if (nsp != NULL) | |
313 | sp->smk_root = nsp; | |
314 | } | |
315 | } | |
316 | ||
317 | /* | |
318 | * Initialize the root inode. | |
319 | */ | |
320 | isp = inode->i_security; | |
321 | if (isp == NULL) | |
322 | inode->i_security = new_inode_smack(sp->smk_root); | |
323 | else | |
324 | isp->smk_inode = sp->smk_root; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | /** | |
330 | * smack_sb_statfs - Smack check on statfs | |
331 | * @dentry: identifies the file system in question | |
332 | * | |
333 | * Returns 0 if current can read the floor of the filesystem, | |
334 | * and error code otherwise | |
335 | */ | |
336 | static int smack_sb_statfs(struct dentry *dentry) | |
337 | { | |
338 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
339 | int rc; |
340 | struct smk_audit_info ad; | |
341 | ||
342 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
343 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 344 | |
ecfcc53f EB |
345 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
346 | return rc; | |
e114e473 CS |
347 | } |
348 | ||
349 | /** | |
350 | * smack_sb_mount - Smack check for mounting | |
351 | * @dev_name: unused | |
251a2a95 | 352 | * @path: mount point |
e114e473 CS |
353 | * @type: unused |
354 | * @flags: unused | |
355 | * @data: unused | |
356 | * | |
357 | * Returns 0 if current can write the floor of the filesystem | |
358 | * being mounted on, an error code otherwise. | |
359 | */ | |
b5266eb4 | 360 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
361 | char *type, unsigned long flags, void *data) |
362 | { | |
b5266eb4 | 363 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 364 | struct smk_audit_info ad; |
e114e473 | 365 | |
ecfcc53f EB |
366 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
367 | smk_ad_setfield_u_fs_path(&ad, *path); | |
368 | ||
369 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
370 | } |
371 | ||
372 | /** | |
373 | * smack_sb_umount - Smack check for unmounting | |
374 | * @mnt: file system to unmount | |
375 | * @flags: unused | |
376 | * | |
377 | * Returns 0 if current can write the floor of the filesystem | |
378 | * being unmounted, an error code otherwise. | |
379 | */ | |
380 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
381 | { | |
382 | struct superblock_smack *sbp; | |
ecfcc53f | 383 | struct smk_audit_info ad; |
e114e473 | 384 | |
ecfcc53f | 385 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
de27a5bf | 386 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); |
ecfcc53f | 387 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
e114e473 | 388 | |
ecfcc53f EB |
389 | sbp = mnt->mnt_sb->s_security; |
390 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
391 | } |
392 | ||
393 | /* | |
394 | * Inode hooks | |
395 | */ | |
396 | ||
397 | /** | |
398 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 399 | * @inode: the inode in need of a blob |
e114e473 CS |
400 | * |
401 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
402 | */ | |
403 | static int smack_inode_alloc_security(struct inode *inode) | |
404 | { | |
86a264ab | 405 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
406 | if (inode->i_security == NULL) |
407 | return -ENOMEM; | |
408 | return 0; | |
409 | } | |
410 | ||
411 | /** | |
412 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 413 | * @inode: the inode with a blob |
e114e473 CS |
414 | * |
415 | * Clears the blob pointer in inode | |
416 | */ | |
417 | static void smack_inode_free_security(struct inode *inode) | |
418 | { | |
419 | kfree(inode->i_security); | |
420 | inode->i_security = NULL; | |
421 | } | |
422 | ||
423 | /** | |
424 | * smack_inode_init_security - copy out the smack from an inode | |
425 | * @inode: the inode | |
426 | * @dir: unused | |
427 | * @name: where to put the attribute name | |
428 | * @value: where to put the attribute value | |
429 | * @len: where to put the length of the attribute | |
430 | * | |
431 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
432 | */ | |
433 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
434 | char **name, void **value, size_t *len) | |
435 | { | |
436 | char *isp = smk_of_inode(inode); | |
437 | ||
438 | if (name) { | |
439 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
440 | if (*name == NULL) | |
441 | return -ENOMEM; | |
442 | } | |
443 | ||
444 | if (value) { | |
445 | *value = kstrdup(isp, GFP_KERNEL); | |
446 | if (*value == NULL) | |
447 | return -ENOMEM; | |
448 | } | |
449 | ||
450 | if (len) | |
451 | *len = strlen(isp) + 1; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /** | |
457 | * smack_inode_link - Smack check on link | |
458 | * @old_dentry: the existing object | |
459 | * @dir: unused | |
460 | * @new_dentry: the new object | |
461 | * | |
462 | * Returns 0 if access is permitted, an error code otherwise | |
463 | */ | |
464 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
465 | struct dentry *new_dentry) | |
466 | { | |
e114e473 | 467 | char *isp; |
ecfcc53f EB |
468 | struct smk_audit_info ad; |
469 | int rc; | |
470 | ||
471 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
472 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
473 | |
474 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 475 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
476 | |
477 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
478 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
479 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
480 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
481 | } |
482 | ||
483 | return rc; | |
484 | } | |
485 | ||
486 | /** | |
487 | * smack_inode_unlink - Smack check on inode deletion | |
488 | * @dir: containing directory object | |
489 | * @dentry: file to unlink | |
490 | * | |
491 | * Returns 0 if current can write the containing directory | |
492 | * and the object, error code otherwise | |
493 | */ | |
494 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
495 | { | |
496 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 497 | struct smk_audit_info ad; |
e114e473 CS |
498 | int rc; |
499 | ||
ecfcc53f EB |
500 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
501 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
502 | ||
e114e473 CS |
503 | /* |
504 | * You need write access to the thing you're unlinking | |
505 | */ | |
ecfcc53f EB |
506 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
507 | if (rc == 0) { | |
e114e473 CS |
508 | /* |
509 | * You also need write access to the containing directory | |
510 | */ | |
ecfcc53f EB |
511 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
512 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
513 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
514 | } | |
e114e473 CS |
515 | return rc; |
516 | } | |
517 | ||
518 | /** | |
519 | * smack_inode_rmdir - Smack check on directory deletion | |
520 | * @dir: containing directory object | |
521 | * @dentry: directory to unlink | |
522 | * | |
523 | * Returns 0 if current can write the containing directory | |
524 | * and the directory, error code otherwise | |
525 | */ | |
526 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
527 | { | |
ecfcc53f | 528 | struct smk_audit_info ad; |
e114e473 CS |
529 | int rc; |
530 | ||
ecfcc53f EB |
531 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
532 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
533 | ||
e114e473 CS |
534 | /* |
535 | * You need write access to the thing you're removing | |
536 | */ | |
ecfcc53f EB |
537 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
538 | if (rc == 0) { | |
e114e473 CS |
539 | /* |
540 | * You also need write access to the containing directory | |
541 | */ | |
ecfcc53f EB |
542 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
543 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
544 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
545 | } | |
e114e473 CS |
546 | |
547 | return rc; | |
548 | } | |
549 | ||
550 | /** | |
551 | * smack_inode_rename - Smack check on rename | |
552 | * @old_inode: the old directory | |
553 | * @old_dentry: unused | |
554 | * @new_inode: the new directory | |
555 | * @new_dentry: unused | |
556 | * | |
557 | * Read and write access is required on both the old and | |
558 | * new directories. | |
559 | * | |
560 | * Returns 0 if access is permitted, an error code otherwise | |
561 | */ | |
562 | static int smack_inode_rename(struct inode *old_inode, | |
563 | struct dentry *old_dentry, | |
564 | struct inode *new_inode, | |
565 | struct dentry *new_dentry) | |
566 | { | |
567 | int rc; | |
568 | char *isp; | |
ecfcc53f EB |
569 | struct smk_audit_info ad; |
570 | ||
571 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
572 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
573 | |
574 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 575 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
576 | |
577 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
578 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
579 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
580 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 581 | } |
e114e473 CS |
582 | return rc; |
583 | } | |
584 | ||
585 | /** | |
586 | * smack_inode_permission - Smack version of permission() | |
587 | * @inode: the inode in question | |
588 | * @mask: the access requested | |
e114e473 CS |
589 | * |
590 | * This is the important Smack hook. | |
591 | * | |
592 | * Returns 0 if access is permitted, -EACCES otherwise | |
593 | */ | |
b77b0646 | 594 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 595 | { |
ecfcc53f | 596 | struct smk_audit_info ad; |
d09ca739 EP |
597 | |
598 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
599 | /* |
600 | * No permission to check. Existence test. Yup, it's there. | |
601 | */ | |
602 | if (mask == 0) | |
603 | return 0; | |
ecfcc53f EB |
604 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
605 | smk_ad_setfield_u_fs_inode(&ad, inode); | |
606 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
607 | } |
608 | ||
609 | /** | |
610 | * smack_inode_setattr - Smack check for setting attributes | |
611 | * @dentry: the object | |
612 | * @iattr: for the force flag | |
613 | * | |
614 | * Returns 0 if access is permitted, an error code otherwise | |
615 | */ | |
616 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
617 | { | |
ecfcc53f | 618 | struct smk_audit_info ad; |
e114e473 CS |
619 | /* |
620 | * Need to allow for clearing the setuid bit. | |
621 | */ | |
622 | if (iattr->ia_valid & ATTR_FORCE) | |
623 | return 0; | |
ecfcc53f EB |
624 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
625 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 626 | |
ecfcc53f | 627 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
628 | } |
629 | ||
630 | /** | |
631 | * smack_inode_getattr - Smack check for getting attributes | |
632 | * @mnt: unused | |
633 | * @dentry: the object | |
634 | * | |
635 | * Returns 0 if access is permitted, an error code otherwise | |
636 | */ | |
637 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
638 | { | |
ecfcc53f EB |
639 | struct smk_audit_info ad; |
640 | ||
641 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
642 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
643 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
644 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
645 | } |
646 | ||
647 | /** | |
648 | * smack_inode_setxattr - Smack check for setting xattrs | |
649 | * @dentry: the object | |
650 | * @name: name of the attribute | |
651 | * @value: unused | |
652 | * @size: unused | |
653 | * @flags: unused | |
654 | * | |
655 | * This protects the Smack attribute explicitly. | |
656 | * | |
657 | * Returns 0 if access is permitted, an error code otherwise | |
658 | */ | |
8f0cfa52 DH |
659 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
660 | const void *value, size_t size, int flags) | |
e114e473 | 661 | { |
ecfcc53f | 662 | struct smk_audit_info ad; |
bcdca225 | 663 | int rc = 0; |
e114e473 | 664 | |
bcdca225 CS |
665 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
666 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
667 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
668 | if (!capable(CAP_MAC_ADMIN)) | |
669 | rc = -EPERM; | |
defc433b EB |
670 | /* |
671 | * check label validity here so import wont fail on | |
672 | * post_setxattr | |
673 | */ | |
674 | if (size == 0 || size >= SMK_LABELLEN || | |
675 | smk_import(value, size) == NULL) | |
4303154e | 676 | rc = -EINVAL; |
bcdca225 CS |
677 | } else |
678 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
679 | ||
ecfcc53f EB |
680 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
681 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
682 | ||
bcdca225 | 683 | if (rc == 0) |
ecfcc53f | 684 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
685 | |
686 | return rc; | |
e114e473 CS |
687 | } |
688 | ||
689 | /** | |
690 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
691 | * @dentry: object | |
692 | * @name: attribute name | |
693 | * @value: attribute value | |
694 | * @size: attribute size | |
695 | * @flags: unused | |
696 | * | |
697 | * Set the pointer in the inode blob to the entry found | |
698 | * in the master label list. | |
699 | */ | |
8f0cfa52 DH |
700 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
701 | const void *value, size_t size, int flags) | |
e114e473 CS |
702 | { |
703 | struct inode_smack *isp; | |
704 | char *nsp; | |
705 | ||
706 | /* | |
707 | * Not SMACK | |
708 | */ | |
709 | if (strcmp(name, XATTR_NAME_SMACK)) | |
710 | return; | |
711 | ||
e114e473 CS |
712 | isp = dentry->d_inode->i_security; |
713 | ||
714 | /* | |
715 | * No locking is done here. This is a pointer | |
716 | * assignment. | |
717 | */ | |
718 | nsp = smk_import(value, size); | |
719 | if (nsp != NULL) | |
720 | isp->smk_inode = nsp; | |
721 | else | |
722 | isp->smk_inode = smack_known_invalid.smk_known; | |
723 | ||
724 | return; | |
725 | } | |
726 | ||
727 | /* | |
728 | * smack_inode_getxattr - Smack check on getxattr | |
729 | * @dentry: the object | |
730 | * @name: unused | |
731 | * | |
732 | * Returns 0 if access is permitted, an error code otherwise | |
733 | */ | |
8f0cfa52 | 734 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 735 | { |
ecfcc53f EB |
736 | struct smk_audit_info ad; |
737 | ||
738 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
739 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
740 | ||
741 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
742 | } |
743 | ||
744 | /* | |
745 | * smack_inode_removexattr - Smack check on removexattr | |
746 | * @dentry: the object | |
747 | * @name: name of the attribute | |
748 | * | |
749 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
750 | * | |
751 | * Returns 0 if access is permitted, an error code otherwise | |
752 | */ | |
8f0cfa52 | 753 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 754 | { |
ecfcc53f | 755 | struct smk_audit_info ad; |
bcdca225 | 756 | int rc = 0; |
e114e473 | 757 | |
bcdca225 CS |
758 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
759 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
760 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
761 | if (!capable(CAP_MAC_ADMIN)) | |
762 | rc = -EPERM; | |
763 | } else | |
764 | rc = cap_inode_removexattr(dentry, name); | |
765 | ||
ecfcc53f EB |
766 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
767 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
bcdca225 | 768 | if (rc == 0) |
ecfcc53f | 769 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
770 | |
771 | return rc; | |
e114e473 CS |
772 | } |
773 | ||
774 | /** | |
775 | * smack_inode_getsecurity - get smack xattrs | |
776 | * @inode: the object | |
777 | * @name: attribute name | |
778 | * @buffer: where to put the result | |
251a2a95 | 779 | * @alloc: unused |
e114e473 CS |
780 | * |
781 | * Returns the size of the attribute or an error code | |
782 | */ | |
783 | static int smack_inode_getsecurity(const struct inode *inode, | |
784 | const char *name, void **buffer, | |
785 | bool alloc) | |
786 | { | |
787 | struct socket_smack *ssp; | |
788 | struct socket *sock; | |
789 | struct super_block *sbp; | |
790 | struct inode *ip = (struct inode *)inode; | |
791 | char *isp; | |
792 | int ilen; | |
793 | int rc = 0; | |
794 | ||
795 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
796 | isp = smk_of_inode(inode); | |
797 | ilen = strlen(isp) + 1; | |
798 | *buffer = isp; | |
799 | return ilen; | |
800 | } | |
801 | ||
802 | /* | |
803 | * The rest of the Smack xattrs are only on sockets. | |
804 | */ | |
805 | sbp = ip->i_sb; | |
806 | if (sbp->s_magic != SOCKFS_MAGIC) | |
807 | return -EOPNOTSUPP; | |
808 | ||
809 | sock = SOCKET_I(ip); | |
2e1d146a | 810 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
811 | return -EOPNOTSUPP; |
812 | ||
813 | ssp = sock->sk->sk_security; | |
814 | ||
815 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
816 | isp = ssp->smk_in; | |
817 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
818 | isp = ssp->smk_out; | |
819 | else | |
820 | return -EOPNOTSUPP; | |
821 | ||
822 | ilen = strlen(isp) + 1; | |
823 | if (rc == 0) { | |
824 | *buffer = isp; | |
825 | rc = ilen; | |
826 | } | |
827 | ||
828 | return rc; | |
829 | } | |
830 | ||
831 | ||
832 | /** | |
833 | * smack_inode_listsecurity - list the Smack attributes | |
834 | * @inode: the object | |
835 | * @buffer: where they go | |
836 | * @buffer_size: size of buffer | |
837 | * | |
838 | * Returns 0 on success, -EINVAL otherwise | |
839 | */ | |
840 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
841 | size_t buffer_size) | |
842 | { | |
843 | int len = strlen(XATTR_NAME_SMACK); | |
844 | ||
845 | if (buffer != NULL && len <= buffer_size) { | |
846 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
847 | return len; | |
848 | } | |
849 | return -EINVAL; | |
850 | } | |
851 | ||
d20bdda6 AD |
852 | /** |
853 | * smack_inode_getsecid - Extract inode's security id | |
854 | * @inode: inode to extract the info from | |
855 | * @secid: where result will be saved | |
856 | */ | |
857 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
858 | { | |
859 | struct inode_smack *isp = inode->i_security; | |
860 | ||
861 | *secid = smack_to_secid(isp->smk_inode); | |
862 | } | |
863 | ||
e114e473 CS |
864 | /* |
865 | * File Hooks | |
866 | */ | |
867 | ||
868 | /** | |
869 | * smack_file_permission - Smack check on file operations | |
870 | * @file: unused | |
871 | * @mask: unused | |
872 | * | |
873 | * Returns 0 | |
874 | * | |
875 | * Should access checks be done on each read or write? | |
876 | * UNICOS and SELinux say yes. | |
877 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
878 | * | |
879 | * I'll say no for now. Smack does not do the frequent | |
880 | * label changing that SELinux does. | |
881 | */ | |
882 | static int smack_file_permission(struct file *file, int mask) | |
883 | { | |
884 | return 0; | |
885 | } | |
886 | ||
887 | /** | |
888 | * smack_file_alloc_security - assign a file security blob | |
889 | * @file: the object | |
890 | * | |
891 | * The security blob for a file is a pointer to the master | |
892 | * label list, so no allocation is done. | |
893 | * | |
894 | * Returns 0 | |
895 | */ | |
896 | static int smack_file_alloc_security(struct file *file) | |
897 | { | |
86a264ab | 898 | file->f_security = current_security(); |
e114e473 CS |
899 | return 0; |
900 | } | |
901 | ||
902 | /** | |
903 | * smack_file_free_security - clear a file security blob | |
904 | * @file: the object | |
905 | * | |
906 | * The security blob for a file is a pointer to the master | |
907 | * label list, so no memory is freed. | |
908 | */ | |
909 | static void smack_file_free_security(struct file *file) | |
910 | { | |
911 | file->f_security = NULL; | |
912 | } | |
913 | ||
914 | /** | |
915 | * smack_file_ioctl - Smack check on ioctls | |
916 | * @file: the object | |
917 | * @cmd: what to do | |
918 | * @arg: unused | |
919 | * | |
920 | * Relies heavily on the correct use of the ioctl command conventions. | |
921 | * | |
922 | * Returns 0 if allowed, error code otherwise | |
923 | */ | |
924 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
925 | unsigned long arg) | |
926 | { | |
927 | int rc = 0; | |
ecfcc53f EB |
928 | struct smk_audit_info ad; |
929 | ||
930 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
931 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
932 | |
933 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 934 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
935 | |
936 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 937 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
938 | |
939 | return rc; | |
940 | } | |
941 | ||
942 | /** | |
943 | * smack_file_lock - Smack check on file locking | |
944 | * @file: the object | |
251a2a95 | 945 | * @cmd: unused |
e114e473 CS |
946 | * |
947 | * Returns 0 if current has write access, error code otherwise | |
948 | */ | |
949 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
950 | { | |
ecfcc53f EB |
951 | struct smk_audit_info ad; |
952 | ||
953 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
954 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); | |
955 | return smk_curacc(file->f_security, MAY_WRITE, &ad); | |
e114e473 CS |
956 | } |
957 | ||
958 | /** | |
959 | * smack_file_fcntl - Smack check on fcntl | |
960 | * @file: the object | |
961 | * @cmd: what action to check | |
962 | * @arg: unused | |
963 | * | |
964 | * Returns 0 if current has access, error code otherwise | |
965 | */ | |
966 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
967 | unsigned long arg) | |
968 | { | |
ecfcc53f | 969 | struct smk_audit_info ad; |
e114e473 CS |
970 | int rc; |
971 | ||
ecfcc53f EB |
972 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
973 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
974 | ||
e114e473 CS |
975 | switch (cmd) { |
976 | case F_DUPFD: | |
977 | case F_GETFD: | |
978 | case F_GETFL: | |
979 | case F_GETLK: | |
980 | case F_GETOWN: | |
981 | case F_GETSIG: | |
ecfcc53f | 982 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
983 | break; |
984 | case F_SETFD: | |
985 | case F_SETFL: | |
986 | case F_SETLK: | |
987 | case F_SETLKW: | |
988 | case F_SETOWN: | |
989 | case F_SETSIG: | |
ecfcc53f | 990 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
991 | break; |
992 | default: | |
ecfcc53f | 993 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
e114e473 CS |
994 | } |
995 | ||
996 | return rc; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * smack_file_set_fowner - set the file security blob value | |
1001 | * @file: object in question | |
1002 | * | |
1003 | * Returns 0 | |
1004 | * Further research may be required on this one. | |
1005 | */ | |
1006 | static int smack_file_set_fowner(struct file *file) | |
1007 | { | |
86a264ab | 1008 | file->f_security = current_security(); |
e114e473 CS |
1009 | return 0; |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * smack_file_send_sigiotask - Smack on sigio | |
1014 | * @tsk: The target task | |
1015 | * @fown: the object the signal come from | |
1016 | * @signum: unused | |
1017 | * | |
1018 | * Allow a privileged task to get signals even if it shouldn't | |
1019 | * | |
1020 | * Returns 0 if a subject with the object's smack could | |
1021 | * write to the task, an error code otherwise. | |
1022 | */ | |
1023 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1024 | struct fown_struct *fown, int signum) | |
1025 | { | |
1026 | struct file *file; | |
1027 | int rc; | |
ecfcc53f EB |
1028 | char *tsp = tsk->cred->security; |
1029 | struct smk_audit_info ad; | |
e114e473 CS |
1030 | |
1031 | /* | |
1032 | * struct fown_struct is never outside the context of a struct file | |
1033 | */ | |
1034 | file = container_of(fown, struct file, f_owner); | |
ecfcc53f EB |
1035 | /* we don't log here as rc can be overriden */ |
1036 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1037 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1038 | rc = 0; |
1039 | ||
1040 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1041 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1042 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1043 | return rc; |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * smack_file_receive - Smack file receive check | |
1048 | * @file: the object | |
1049 | * | |
1050 | * Returns 0 if current has access, error code otherwise | |
1051 | */ | |
1052 | static int smack_file_receive(struct file *file) | |
1053 | { | |
1054 | int may = 0; | |
ecfcc53f | 1055 | struct smk_audit_info ad; |
e114e473 | 1056 | |
ecfcc53f EB |
1057 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1058 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1059 | /* |
1060 | * This code relies on bitmasks. | |
1061 | */ | |
1062 | if (file->f_mode & FMODE_READ) | |
1063 | may = MAY_READ; | |
1064 | if (file->f_mode & FMODE_WRITE) | |
1065 | may |= MAY_WRITE; | |
1066 | ||
ecfcc53f | 1067 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1068 | } |
1069 | ||
1070 | /* | |
1071 | * Task hooks | |
1072 | */ | |
1073 | ||
ee18d64c DH |
1074 | /** |
1075 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1076 | * @new: the new credentials | |
1077 | * @gfp: the atomicity of any memory allocations | |
1078 | * | |
1079 | * Prepare a blank set of credentials for modification. This must allocate all | |
1080 | * the memory the LSM module might require such that cred_transfer() can | |
1081 | * complete without error. | |
1082 | */ | |
1083 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1084 | { | |
1085 | cred->security = NULL; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | ||
e114e473 | 1090 | /** |
f1752eec DH |
1091 | * smack_cred_free - "free" task-level security credentials |
1092 | * @cred: the credentials in question | |
e114e473 CS |
1093 | * |
1094 | * Smack isn't using copies of blobs. Everyone | |
1095 | * points to an immutable list. The blobs never go away. | |
1096 | * There is no leak here. | |
1097 | */ | |
f1752eec | 1098 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1099 | { |
f1752eec | 1100 | cred->security = NULL; |
e114e473 CS |
1101 | } |
1102 | ||
d84f4f99 DH |
1103 | /** |
1104 | * smack_cred_prepare - prepare new set of credentials for modification | |
1105 | * @new: the new credentials | |
1106 | * @old: the original credentials | |
1107 | * @gfp: the atomicity of any memory allocations | |
1108 | * | |
1109 | * Prepare a new set of credentials for modification. | |
1110 | */ | |
1111 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1112 | gfp_t gfp) | |
1113 | { | |
1114 | new->security = old->security; | |
1115 | return 0; | |
1116 | } | |
1117 | ||
ee18d64c DH |
1118 | /** |
1119 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1120 | * @new: the new credentials | |
1121 | * @old: the original credentials | |
1122 | * | |
1123 | * Fill in a set of blank credentials from another set of credentials. | |
1124 | */ | |
1125 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1126 | { | |
1127 | new->security = old->security; | |
1128 | } | |
1129 | ||
3a3b7ce9 DH |
1130 | /** |
1131 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1132 | * @new: points to the set of credentials to be modified. |
1133 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1134 | * |
1135 | * Set the security data for a kernel service. | |
1136 | */ | |
1137 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1138 | { | |
1139 | char *smack = smack_from_secid(secid); | |
1140 | ||
1141 | if (smack == NULL) | |
1142 | return -EINVAL; | |
1143 | ||
1144 | new->security = smack; | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | /** | |
1149 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1150 | * @new: points to the set of credentials to be modified |
1151 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1152 | * |
1153 | * Set the file creation context in a set of credentials to the same | |
1154 | * as the objective context of the specified inode | |
1155 | */ | |
1156 | static int smack_kernel_create_files_as(struct cred *new, | |
1157 | struct inode *inode) | |
1158 | { | |
1159 | struct inode_smack *isp = inode->i_security; | |
1160 | ||
1161 | new->security = isp->smk_inode; | |
1162 | return 0; | |
1163 | } | |
1164 | ||
ecfcc53f EB |
1165 | /** |
1166 | * smk_curacc_on_task - helper to log task related access | |
1167 | * @p: the task object | |
1168 | * @access : the access requested | |
1169 | * | |
1170 | * Return 0 if access is permitted | |
1171 | */ | |
1172 | static int smk_curacc_on_task(struct task_struct *p, int access) | |
1173 | { | |
1174 | struct smk_audit_info ad; | |
1175 | ||
1176 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1177 | smk_ad_setfield_u_tsk(&ad, p); | |
1178 | return smk_curacc(task_security(p), access, &ad); | |
1179 | } | |
1180 | ||
e114e473 CS |
1181 | /** |
1182 | * smack_task_setpgid - Smack check on setting pgid | |
1183 | * @p: the task object | |
1184 | * @pgid: unused | |
1185 | * | |
1186 | * Return 0 if write access is permitted | |
1187 | */ | |
1188 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1189 | { | |
ecfcc53f | 1190 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1191 | } |
1192 | ||
1193 | /** | |
1194 | * smack_task_getpgid - Smack access check for getpgid | |
1195 | * @p: the object task | |
1196 | * | |
1197 | * Returns 0 if current can read the object task, error code otherwise | |
1198 | */ | |
1199 | static int smack_task_getpgid(struct task_struct *p) | |
1200 | { | |
ecfcc53f | 1201 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1202 | } |
1203 | ||
1204 | /** | |
1205 | * smack_task_getsid - Smack access check for getsid | |
1206 | * @p: the object task | |
1207 | * | |
1208 | * Returns 0 if current can read the object task, error code otherwise | |
1209 | */ | |
1210 | static int smack_task_getsid(struct task_struct *p) | |
1211 | { | |
ecfcc53f | 1212 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1213 | } |
1214 | ||
1215 | /** | |
1216 | * smack_task_getsecid - get the secid of the task | |
1217 | * @p: the object task | |
1218 | * @secid: where to put the result | |
1219 | * | |
1220 | * Sets the secid to contain a u32 version of the smack label. | |
1221 | */ | |
1222 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1223 | { | |
c69e8d9c | 1224 | *secid = smack_to_secid(task_security(p)); |
e114e473 CS |
1225 | } |
1226 | ||
1227 | /** | |
1228 | * smack_task_setnice - Smack check on setting nice | |
1229 | * @p: the task object | |
1230 | * @nice: unused | |
1231 | * | |
1232 | * Return 0 if write access is permitted | |
1233 | */ | |
1234 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1235 | { | |
bcdca225 CS |
1236 | int rc; |
1237 | ||
1238 | rc = cap_task_setnice(p, nice); | |
1239 | if (rc == 0) | |
ecfcc53f | 1240 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1241 | return rc; |
e114e473 CS |
1242 | } |
1243 | ||
1244 | /** | |
1245 | * smack_task_setioprio - Smack check on setting ioprio | |
1246 | * @p: the task object | |
1247 | * @ioprio: unused | |
1248 | * | |
1249 | * Return 0 if write access is permitted | |
1250 | */ | |
1251 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1252 | { | |
bcdca225 CS |
1253 | int rc; |
1254 | ||
1255 | rc = cap_task_setioprio(p, ioprio); | |
1256 | if (rc == 0) | |
ecfcc53f | 1257 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1258 | return rc; |
e114e473 CS |
1259 | } |
1260 | ||
1261 | /** | |
1262 | * smack_task_getioprio - Smack check on reading ioprio | |
1263 | * @p: the task object | |
1264 | * | |
1265 | * Return 0 if read access is permitted | |
1266 | */ | |
1267 | static int smack_task_getioprio(struct task_struct *p) | |
1268 | { | |
ecfcc53f | 1269 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1270 | } |
1271 | ||
1272 | /** | |
1273 | * smack_task_setscheduler - Smack check on setting scheduler | |
1274 | * @p: the task object | |
1275 | * @policy: unused | |
1276 | * @lp: unused | |
1277 | * | |
1278 | * Return 0 if read access is permitted | |
1279 | */ | |
b0ae1981 | 1280 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1281 | { |
bcdca225 CS |
1282 | int rc; |
1283 | ||
b0ae1981 | 1284 | rc = cap_task_setscheduler(p); |
bcdca225 | 1285 | if (rc == 0) |
ecfcc53f | 1286 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1287 | return rc; |
e114e473 CS |
1288 | } |
1289 | ||
1290 | /** | |
1291 | * smack_task_getscheduler - Smack check on reading scheduler | |
1292 | * @p: the task object | |
1293 | * | |
1294 | * Return 0 if read access is permitted | |
1295 | */ | |
1296 | static int smack_task_getscheduler(struct task_struct *p) | |
1297 | { | |
ecfcc53f | 1298 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1299 | } |
1300 | ||
1301 | /** | |
1302 | * smack_task_movememory - Smack check on moving memory | |
1303 | * @p: the task object | |
1304 | * | |
1305 | * Return 0 if write access is permitted | |
1306 | */ | |
1307 | static int smack_task_movememory(struct task_struct *p) | |
1308 | { | |
ecfcc53f | 1309 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1310 | } |
1311 | ||
1312 | /** | |
1313 | * smack_task_kill - Smack check on signal delivery | |
1314 | * @p: the task object | |
1315 | * @info: unused | |
1316 | * @sig: unused | |
1317 | * @secid: identifies the smack to use in lieu of current's | |
1318 | * | |
1319 | * Return 0 if write access is permitted | |
1320 | * | |
1321 | * The secid behavior is an artifact of an SELinux hack | |
1322 | * in the USB code. Someday it may go away. | |
1323 | */ | |
1324 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1325 | int sig, u32 secid) | |
1326 | { | |
ecfcc53f EB |
1327 | struct smk_audit_info ad; |
1328 | ||
1329 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1330 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1331 | /* |
1332 | * Sending a signal requires that the sender | |
1333 | * can write the receiver. | |
1334 | */ | |
1335 | if (secid == 0) | |
ecfcc53f | 1336 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
e114e473 CS |
1337 | /* |
1338 | * If the secid isn't 0 we're dealing with some USB IO | |
1339 | * specific behavior. This is not clean. For one thing | |
1340 | * we can't take privilege into account. | |
1341 | */ | |
ecfcc53f EB |
1342 | return smk_access(smack_from_secid(secid), task_security(p), |
1343 | MAY_WRITE, &ad); | |
e114e473 CS |
1344 | } |
1345 | ||
1346 | /** | |
1347 | * smack_task_wait - Smack access check for waiting | |
1348 | * @p: task to wait for | |
1349 | * | |
1350 | * Returns 0 if current can wait for p, error code otherwise | |
1351 | */ | |
1352 | static int smack_task_wait(struct task_struct *p) | |
1353 | { | |
ecfcc53f EB |
1354 | struct smk_audit_info ad; |
1355 | char *sp = current_security(); | |
1356 | char *tsp = task_security(p); | |
e114e473 CS |
1357 | int rc; |
1358 | ||
ecfcc53f EB |
1359 | /* we don't log here, we can be overriden */ |
1360 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); | |
e114e473 | 1361 | if (rc == 0) |
ecfcc53f | 1362 | goto out_log; |
e114e473 CS |
1363 | |
1364 | /* | |
1365 | * Allow the operation to succeed if either task | |
1366 | * has privilege to perform operations that might | |
1367 | * account for the smack labels having gotten to | |
1368 | * be different in the first place. | |
1369 | * | |
5cd9c58f | 1370 | * This breaks the strict subject/object access |
e114e473 CS |
1371 | * control ideal, taking the object's privilege |
1372 | * state into account in the decision as well as | |
1373 | * the smack value. | |
1374 | */ | |
5cd9c58f | 1375 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1376 | rc = 0; |
1377 | /* we log only if we didn't get overriden */ | |
1378 | out_log: | |
1379 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1380 | smk_ad_setfield_u_tsk(&ad, p); | |
1381 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1382 | return rc; |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * smack_task_to_inode - copy task smack into the inode blob | |
1387 | * @p: task to copy from | |
251a2a95 | 1388 | * @inode: inode to copy to |
e114e473 CS |
1389 | * |
1390 | * Sets the smack pointer in the inode security blob | |
1391 | */ | |
1392 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1393 | { | |
1394 | struct inode_smack *isp = inode->i_security; | |
c69e8d9c | 1395 | isp->smk_inode = task_security(p); |
e114e473 CS |
1396 | } |
1397 | ||
1398 | /* | |
1399 | * Socket hooks. | |
1400 | */ | |
1401 | ||
1402 | /** | |
1403 | * smack_sk_alloc_security - Allocate a socket blob | |
1404 | * @sk: the socket | |
1405 | * @family: unused | |
251a2a95 | 1406 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1407 | * |
1408 | * Assign Smack pointers to current | |
1409 | * | |
1410 | * Returns 0 on success, -ENOMEM is there's no memory | |
1411 | */ | |
1412 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1413 | { | |
86a264ab | 1414 | char *csp = current_security(); |
e114e473 CS |
1415 | struct socket_smack *ssp; |
1416 | ||
1417 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1418 | if (ssp == NULL) | |
1419 | return -ENOMEM; | |
1420 | ||
1421 | ssp->smk_in = csp; | |
1422 | ssp->smk_out = csp; | |
1423 | ssp->smk_packet[0] = '\0'; | |
1424 | ||
1425 | sk->sk_security = ssp; | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | /** | |
1431 | * smack_sk_free_security - Free a socket blob | |
1432 | * @sk: the socket | |
1433 | * | |
1434 | * Clears the blob pointer | |
1435 | */ | |
1436 | static void smack_sk_free_security(struct sock *sk) | |
1437 | { | |
1438 | kfree(sk->sk_security); | |
1439 | } | |
1440 | ||
07feee8f PM |
1441 | /** |
1442 | * smack_host_label - check host based restrictions | |
1443 | * @sip: the object end | |
1444 | * | |
1445 | * looks for host based access restrictions | |
1446 | * | |
1447 | * This version will only be appropriate for really small sets of single label | |
1448 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1449 | * taken before calling this function. | |
1450 | * | |
1451 | * Returns the label of the far end or NULL if it's not special. | |
1452 | */ | |
1453 | static char *smack_host_label(struct sockaddr_in *sip) | |
1454 | { | |
1455 | struct smk_netlbladdr *snp; | |
1456 | struct in_addr *siap = &sip->sin_addr; | |
1457 | ||
1458 | if (siap->s_addr == 0) | |
1459 | return NULL; | |
1460 | ||
1461 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1462 | /* | |
1463 | * we break after finding the first match because | |
1464 | * the list is sorted from longest to shortest mask | |
1465 | * so we have found the most specific match | |
1466 | */ | |
1467 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1468 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1469 | /* we have found the special CIPSO option */ | |
1470 | if (snp->smk_label == smack_cipso_option) | |
1471 | return NULL; | |
07feee8f | 1472 | return snp->smk_label; |
4303154e | 1473 | } |
07feee8f PM |
1474 | |
1475 | return NULL; | |
1476 | } | |
1477 | ||
e114e473 CS |
1478 | /** |
1479 | * smack_set_catset - convert a capset to netlabel mls categories | |
1480 | * @catset: the Smack categories | |
1481 | * @sap: where to put the netlabel categories | |
1482 | * | |
1483 | * Allocates and fills attr.mls.cat | |
1484 | */ | |
1485 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1486 | { | |
1487 | unsigned char *cp; | |
1488 | unsigned char m; | |
1489 | int cat; | |
1490 | int rc; | |
1491 | int byte; | |
1492 | ||
c60264c4 | 1493 | if (!catset) |
e114e473 CS |
1494 | return; |
1495 | ||
1496 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1497 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1498 | sap->attr.mls.cat->startbit = 0; | |
1499 | ||
1500 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1501 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1502 | if ((m & *cp) == 0) | |
1503 | continue; | |
1504 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1505 | cat, GFP_ATOMIC); | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * smack_to_secattr - fill a secattr from a smack value | |
1511 | * @smack: the smack value | |
1512 | * @nlsp: where the result goes | |
1513 | * | |
1514 | * Casey says that CIPSO is good enough for now. | |
1515 | * It can be used to effect. | |
1516 | * It can also be abused to effect when necessary. | |
1517 | * Appologies to the TSIG group in general and GW in particular. | |
1518 | */ | |
1519 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1520 | { | |
1521 | struct smack_cipso cipso; | |
1522 | int rc; | |
1523 | ||
6d3dc07c CS |
1524 | nlsp->domain = smack; |
1525 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1526 | |
6d3dc07c CS |
1527 | rc = smack_to_cipso(smack, &cipso); |
1528 | if (rc == 0) { | |
1529 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1530 | smack_set_catset(cipso.smk_catset, nlsp); | |
1531 | } else { | |
1532 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1533 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1534 | } |
1535 | } | |
1536 | ||
1537 | /** | |
1538 | * smack_netlabel - Set the secattr on a socket | |
1539 | * @sk: the socket | |
6d3dc07c | 1540 | * @labeled: socket label scheme |
e114e473 CS |
1541 | * |
1542 | * Convert the outbound smack value (smk_out) to a | |
1543 | * secattr and attach it to the socket. | |
1544 | * | |
1545 | * Returns 0 on success or an error code | |
1546 | */ | |
6d3dc07c | 1547 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1548 | { |
07feee8f | 1549 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1550 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1551 | int rc = 0; |
e114e473 | 1552 | |
6d3dc07c CS |
1553 | /* |
1554 | * Usually the netlabel code will handle changing the | |
1555 | * packet labeling based on the label. | |
1556 | * The case of a single label host is different, because | |
1557 | * a single label host should never get a labeled packet | |
1558 | * even though the label is usually associated with a packet | |
1559 | * label. | |
1560 | */ | |
1561 | local_bh_disable(); | |
1562 | bh_lock_sock_nested(sk); | |
1563 | ||
1564 | if (ssp->smk_out == smack_net_ambient || | |
1565 | labeled == SMACK_UNLABELED_SOCKET) | |
1566 | netlbl_sock_delattr(sk); | |
1567 | else { | |
1568 | netlbl_secattr_init(&secattr); | |
1569 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1570 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1571 | netlbl_secattr_destroy(&secattr); |
1572 | } | |
1573 | ||
1574 | bh_unlock_sock(sk); | |
1575 | local_bh_enable(); | |
4bc87e62 | 1576 | |
e114e473 CS |
1577 | return rc; |
1578 | } | |
1579 | ||
07feee8f PM |
1580 | /** |
1581 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1582 | * @sk: the socket | |
1583 | * @sap: the destination address | |
1584 | * | |
1585 | * Set the correct secattr for the given socket based on the destination | |
1586 | * address and perform any outbound access checks needed. | |
1587 | * | |
1588 | * Returns 0 on success or an error code. | |
1589 | * | |
1590 | */ | |
1591 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1592 | { | |
1593 | int rc; | |
1594 | int sk_lbl; | |
1595 | char *hostsp; | |
1596 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1597 | struct smk_audit_info ad; |
07feee8f PM |
1598 | |
1599 | rcu_read_lock(); | |
1600 | hostsp = smack_host_label(sap); | |
1601 | if (hostsp != NULL) { | |
1602 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1603 | #ifdef CONFIG_AUDIT |
1604 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1605 | ad.a.u.net.family = sap->sin_family; | |
1606 | ad.a.u.net.dport = sap->sin_port; | |
1607 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1608 | #endif | |
1609 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1610 | } else { |
1611 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1612 | rc = 0; | |
1613 | } | |
1614 | rcu_read_unlock(); | |
1615 | if (rc != 0) | |
1616 | return rc; | |
1617 | ||
1618 | return smack_netlabel(sk, sk_lbl); | |
1619 | } | |
1620 | ||
e114e473 CS |
1621 | /** |
1622 | * smack_inode_setsecurity - set smack xattrs | |
1623 | * @inode: the object | |
1624 | * @name: attribute name | |
1625 | * @value: attribute value | |
1626 | * @size: size of the attribute | |
1627 | * @flags: unused | |
1628 | * | |
1629 | * Sets the named attribute in the appropriate blob | |
1630 | * | |
1631 | * Returns 0 on success, or an error code | |
1632 | */ | |
1633 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1634 | const void *value, size_t size, int flags) | |
1635 | { | |
1636 | char *sp; | |
1637 | struct inode_smack *nsp = inode->i_security; | |
1638 | struct socket_smack *ssp; | |
1639 | struct socket *sock; | |
4bc87e62 | 1640 | int rc = 0; |
e114e473 | 1641 | |
4303154e | 1642 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1643 | return -EACCES; |
1644 | ||
1645 | sp = smk_import(value, size); | |
1646 | if (sp == NULL) | |
1647 | return -EINVAL; | |
1648 | ||
1649 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1650 | nsp->smk_inode = sp; | |
ddd29ec6 | 1651 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1652 | return 0; |
1653 | } | |
1654 | /* | |
1655 | * The rest of the Smack xattrs are only on sockets. | |
1656 | */ | |
1657 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1658 | return -EOPNOTSUPP; | |
1659 | ||
1660 | sock = SOCKET_I(inode); | |
2e1d146a | 1661 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1662 | return -EOPNOTSUPP; |
1663 | ||
1664 | ssp = sock->sk->sk_security; | |
1665 | ||
1666 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1667 | ssp->smk_in = sp; | |
1668 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1669 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
1670 | if (sock->sk->sk_family != PF_UNIX) { |
1671 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
1672 | if (rc != 0) | |
1673 | printk(KERN_WARNING | |
1674 | "Smack: \"%s\" netlbl error %d.\n", | |
1675 | __func__, -rc); | |
1676 | } | |
e114e473 CS |
1677 | } else |
1678 | return -EOPNOTSUPP; | |
1679 | ||
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | /** | |
1684 | * smack_socket_post_create - finish socket setup | |
1685 | * @sock: the socket | |
1686 | * @family: protocol family | |
1687 | * @type: unused | |
1688 | * @protocol: unused | |
1689 | * @kern: unused | |
1690 | * | |
1691 | * Sets the netlabel information on the socket | |
1692 | * | |
1693 | * Returns 0 on success, and error code otherwise | |
1694 | */ | |
1695 | static int smack_socket_post_create(struct socket *sock, int family, | |
1696 | int type, int protocol, int kern) | |
1697 | { | |
2e1d146a | 1698 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1699 | return 0; |
1700 | /* | |
1701 | * Set the outbound netlbl. | |
1702 | */ | |
6d3dc07c CS |
1703 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1704 | } | |
1705 | ||
6d3dc07c CS |
1706 | /** |
1707 | * smack_socket_connect - connect access check | |
1708 | * @sock: the socket | |
1709 | * @sap: the other end | |
1710 | * @addrlen: size of sap | |
1711 | * | |
1712 | * Verifies that a connection may be possible | |
1713 | * | |
1714 | * Returns 0 on success, and error code otherwise | |
1715 | */ | |
1716 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1717 | int addrlen) | |
1718 | { | |
6d3dc07c CS |
1719 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1720 | return 0; | |
6d3dc07c CS |
1721 | if (addrlen < sizeof(struct sockaddr_in)) |
1722 | return -EINVAL; | |
1723 | ||
07feee8f | 1724 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1725 | } |
1726 | ||
1727 | /** | |
1728 | * smack_flags_to_may - convert S_ to MAY_ values | |
1729 | * @flags: the S_ value | |
1730 | * | |
1731 | * Returns the equivalent MAY_ value | |
1732 | */ | |
1733 | static int smack_flags_to_may(int flags) | |
1734 | { | |
1735 | int may = 0; | |
1736 | ||
1737 | if (flags & S_IRUGO) | |
1738 | may |= MAY_READ; | |
1739 | if (flags & S_IWUGO) | |
1740 | may |= MAY_WRITE; | |
1741 | if (flags & S_IXUGO) | |
1742 | may |= MAY_EXEC; | |
1743 | ||
1744 | return may; | |
1745 | } | |
1746 | ||
1747 | /** | |
1748 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1749 | * @msg: the object | |
1750 | * | |
1751 | * Returns 0 | |
1752 | */ | |
1753 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1754 | { | |
86a264ab | 1755 | msg->security = current_security(); |
e114e473 CS |
1756 | return 0; |
1757 | } | |
1758 | ||
1759 | /** | |
1760 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1761 | * @msg: the object | |
1762 | * | |
1763 | * Clears the blob pointer | |
1764 | */ | |
1765 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1766 | { | |
1767 | msg->security = NULL; | |
1768 | } | |
1769 | ||
1770 | /** | |
1771 | * smack_of_shm - the smack pointer for the shm | |
1772 | * @shp: the object | |
1773 | * | |
1774 | * Returns a pointer to the smack value | |
1775 | */ | |
1776 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1777 | { | |
1778 | return (char *)shp->shm_perm.security; | |
1779 | } | |
1780 | ||
1781 | /** | |
1782 | * smack_shm_alloc_security - Set the security blob for shm | |
1783 | * @shp: the object | |
1784 | * | |
1785 | * Returns 0 | |
1786 | */ | |
1787 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1788 | { | |
1789 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1790 | ||
86a264ab | 1791 | isp->security = current_security(); |
e114e473 CS |
1792 | return 0; |
1793 | } | |
1794 | ||
1795 | /** | |
1796 | * smack_shm_free_security - Clear the security blob for shm | |
1797 | * @shp: the object | |
1798 | * | |
1799 | * Clears the blob pointer | |
1800 | */ | |
1801 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1802 | { | |
1803 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1804 | ||
1805 | isp->security = NULL; | |
1806 | } | |
1807 | ||
ecfcc53f EB |
1808 | /** |
1809 | * smk_curacc_shm : check if current has access on shm | |
1810 | * @shp : the object | |
1811 | * @access : access requested | |
1812 | * | |
1813 | * Returns 0 if current has the requested access, error code otherwise | |
1814 | */ | |
1815 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
1816 | { | |
1817 | char *ssp = smack_of_shm(shp); | |
1818 | struct smk_audit_info ad; | |
1819 | ||
1820 | #ifdef CONFIG_AUDIT | |
1821 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1822 | ad.a.u.ipc_id = shp->shm_perm.id; | |
1823 | #endif | |
1824 | return smk_curacc(ssp, access, &ad); | |
1825 | } | |
1826 | ||
e114e473 CS |
1827 | /** |
1828 | * smack_shm_associate - Smack access check for shm | |
1829 | * @shp: the object | |
1830 | * @shmflg: access requested | |
1831 | * | |
1832 | * Returns 0 if current has the requested access, error code otherwise | |
1833 | */ | |
1834 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1835 | { | |
e114e473 CS |
1836 | int may; |
1837 | ||
1838 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1839 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1840 | } |
1841 | ||
1842 | /** | |
1843 | * smack_shm_shmctl - Smack access check for shm | |
1844 | * @shp: the object | |
1845 | * @cmd: what it wants to do | |
1846 | * | |
1847 | * Returns 0 if current has the requested access, error code otherwise | |
1848 | */ | |
1849 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1850 | { | |
e114e473 CS |
1851 | int may; |
1852 | ||
1853 | switch (cmd) { | |
1854 | case IPC_STAT: | |
1855 | case SHM_STAT: | |
1856 | may = MAY_READ; | |
1857 | break; | |
1858 | case IPC_SET: | |
1859 | case SHM_LOCK: | |
1860 | case SHM_UNLOCK: | |
1861 | case IPC_RMID: | |
1862 | may = MAY_READWRITE; | |
1863 | break; | |
1864 | case IPC_INFO: | |
1865 | case SHM_INFO: | |
1866 | /* | |
1867 | * System level information. | |
1868 | */ | |
1869 | return 0; | |
1870 | default: | |
1871 | return -EINVAL; | |
1872 | } | |
ecfcc53f | 1873 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1874 | } |
1875 | ||
1876 | /** | |
1877 | * smack_shm_shmat - Smack access for shmat | |
1878 | * @shp: the object | |
1879 | * @shmaddr: unused | |
1880 | * @shmflg: access requested | |
1881 | * | |
1882 | * Returns 0 if current has the requested access, error code otherwise | |
1883 | */ | |
1884 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1885 | int shmflg) | |
1886 | { | |
e114e473 CS |
1887 | int may; |
1888 | ||
1889 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1890 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1891 | } |
1892 | ||
1893 | /** | |
1894 | * smack_of_sem - the smack pointer for the sem | |
1895 | * @sma: the object | |
1896 | * | |
1897 | * Returns a pointer to the smack value | |
1898 | */ | |
1899 | static char *smack_of_sem(struct sem_array *sma) | |
1900 | { | |
1901 | return (char *)sma->sem_perm.security; | |
1902 | } | |
1903 | ||
1904 | /** | |
1905 | * smack_sem_alloc_security - Set the security blob for sem | |
1906 | * @sma: the object | |
1907 | * | |
1908 | * Returns 0 | |
1909 | */ | |
1910 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1911 | { | |
1912 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1913 | ||
86a264ab | 1914 | isp->security = current_security(); |
e114e473 CS |
1915 | return 0; |
1916 | } | |
1917 | ||
1918 | /** | |
1919 | * smack_sem_free_security - Clear the security blob for sem | |
1920 | * @sma: the object | |
1921 | * | |
1922 | * Clears the blob pointer | |
1923 | */ | |
1924 | static void smack_sem_free_security(struct sem_array *sma) | |
1925 | { | |
1926 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1927 | ||
1928 | isp->security = NULL; | |
1929 | } | |
1930 | ||
ecfcc53f EB |
1931 | /** |
1932 | * smk_curacc_sem : check if current has access on sem | |
1933 | * @sma : the object | |
1934 | * @access : access requested | |
1935 | * | |
1936 | * Returns 0 if current has the requested access, error code otherwise | |
1937 | */ | |
1938 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
1939 | { | |
1940 | char *ssp = smack_of_sem(sma); | |
1941 | struct smk_audit_info ad; | |
1942 | ||
1943 | #ifdef CONFIG_AUDIT | |
1944 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1945 | ad.a.u.ipc_id = sma->sem_perm.id; | |
1946 | #endif | |
1947 | return smk_curacc(ssp, access, &ad); | |
1948 | } | |
1949 | ||
e114e473 CS |
1950 | /** |
1951 | * smack_sem_associate - Smack access check for sem | |
1952 | * @sma: the object | |
1953 | * @semflg: access requested | |
1954 | * | |
1955 | * Returns 0 if current has the requested access, error code otherwise | |
1956 | */ | |
1957 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1958 | { | |
e114e473 CS |
1959 | int may; |
1960 | ||
1961 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 1962 | return smk_curacc_sem(sma, may); |
e114e473 CS |
1963 | } |
1964 | ||
1965 | /** | |
1966 | * smack_sem_shmctl - Smack access check for sem | |
1967 | * @sma: the object | |
1968 | * @cmd: what it wants to do | |
1969 | * | |
1970 | * Returns 0 if current has the requested access, error code otherwise | |
1971 | */ | |
1972 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1973 | { | |
e114e473 CS |
1974 | int may; |
1975 | ||
1976 | switch (cmd) { | |
1977 | case GETPID: | |
1978 | case GETNCNT: | |
1979 | case GETZCNT: | |
1980 | case GETVAL: | |
1981 | case GETALL: | |
1982 | case IPC_STAT: | |
1983 | case SEM_STAT: | |
1984 | may = MAY_READ; | |
1985 | break; | |
1986 | case SETVAL: | |
1987 | case SETALL: | |
1988 | case IPC_RMID: | |
1989 | case IPC_SET: | |
1990 | may = MAY_READWRITE; | |
1991 | break; | |
1992 | case IPC_INFO: | |
1993 | case SEM_INFO: | |
1994 | /* | |
1995 | * System level information | |
1996 | */ | |
1997 | return 0; | |
1998 | default: | |
1999 | return -EINVAL; | |
2000 | } | |
2001 | ||
ecfcc53f | 2002 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2003 | } |
2004 | ||
2005 | /** | |
2006 | * smack_sem_semop - Smack checks of semaphore operations | |
2007 | * @sma: the object | |
2008 | * @sops: unused | |
2009 | * @nsops: unused | |
2010 | * @alter: unused | |
2011 | * | |
2012 | * Treated as read and write in all cases. | |
2013 | * | |
2014 | * Returns 0 if access is allowed, error code otherwise | |
2015 | */ | |
2016 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2017 | unsigned nsops, int alter) | |
2018 | { | |
ecfcc53f | 2019 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2020 | } |
2021 | ||
2022 | /** | |
2023 | * smack_msg_alloc_security - Set the security blob for msg | |
2024 | * @msq: the object | |
2025 | * | |
2026 | * Returns 0 | |
2027 | */ | |
2028 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2029 | { | |
2030 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2031 | ||
86a264ab | 2032 | kisp->security = current_security(); |
e114e473 CS |
2033 | return 0; |
2034 | } | |
2035 | ||
2036 | /** | |
2037 | * smack_msg_free_security - Clear the security blob for msg | |
2038 | * @msq: the object | |
2039 | * | |
2040 | * Clears the blob pointer | |
2041 | */ | |
2042 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2043 | { | |
2044 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2045 | ||
2046 | kisp->security = NULL; | |
2047 | } | |
2048 | ||
2049 | /** | |
2050 | * smack_of_msq - the smack pointer for the msq | |
2051 | * @msq: the object | |
2052 | * | |
2053 | * Returns a pointer to the smack value | |
2054 | */ | |
2055 | static char *smack_of_msq(struct msg_queue *msq) | |
2056 | { | |
2057 | return (char *)msq->q_perm.security; | |
2058 | } | |
2059 | ||
ecfcc53f EB |
2060 | /** |
2061 | * smk_curacc_msq : helper to check if current has access on msq | |
2062 | * @msq : the msq | |
2063 | * @access : access requested | |
2064 | * | |
2065 | * return 0 if current has access, error otherwise | |
2066 | */ | |
2067 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2068 | { | |
2069 | char *msp = smack_of_msq(msq); | |
2070 | struct smk_audit_info ad; | |
2071 | ||
2072 | #ifdef CONFIG_AUDIT | |
2073 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2074 | ad.a.u.ipc_id = msq->q_perm.id; | |
2075 | #endif | |
2076 | return smk_curacc(msp, access, &ad); | |
2077 | } | |
2078 | ||
e114e473 CS |
2079 | /** |
2080 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2081 | * @msq: the object | |
2082 | * @msqflg: access requested | |
2083 | * | |
2084 | * Returns 0 if current has the requested access, error code otherwise | |
2085 | */ | |
2086 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2087 | { | |
e114e473 CS |
2088 | int may; |
2089 | ||
2090 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2091 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2092 | } |
2093 | ||
2094 | /** | |
2095 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2096 | * @msq: the object | |
2097 | * @cmd: what it wants to do | |
2098 | * | |
2099 | * Returns 0 if current has the requested access, error code otherwise | |
2100 | */ | |
2101 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2102 | { | |
e114e473 CS |
2103 | int may; |
2104 | ||
2105 | switch (cmd) { | |
2106 | case IPC_STAT: | |
2107 | case MSG_STAT: | |
2108 | may = MAY_READ; | |
2109 | break; | |
2110 | case IPC_SET: | |
2111 | case IPC_RMID: | |
2112 | may = MAY_READWRITE; | |
2113 | break; | |
2114 | case IPC_INFO: | |
2115 | case MSG_INFO: | |
2116 | /* | |
2117 | * System level information | |
2118 | */ | |
2119 | return 0; | |
2120 | default: | |
2121 | return -EINVAL; | |
2122 | } | |
2123 | ||
ecfcc53f | 2124 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2125 | } |
2126 | ||
2127 | /** | |
2128 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2129 | * @msq: the object | |
2130 | * @msg: unused | |
2131 | * @msqflg: access requested | |
2132 | * | |
2133 | * Returns 0 if current has the requested access, error code otherwise | |
2134 | */ | |
2135 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2136 | int msqflg) | |
2137 | { | |
ecfcc53f | 2138 | int may; |
e114e473 | 2139 | |
ecfcc53f EB |
2140 | may = smack_flags_to_may(msqflg); |
2141 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2142 | } |
2143 | ||
2144 | /** | |
2145 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2146 | * @msq: the object | |
2147 | * @msg: unused | |
2148 | * @target: unused | |
2149 | * @type: unused | |
2150 | * @mode: unused | |
2151 | * | |
2152 | * Returns 0 if current has read and write access, error code otherwise | |
2153 | */ | |
2154 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2155 | struct task_struct *target, long type, int mode) | |
2156 | { | |
ecfcc53f | 2157 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2158 | } |
2159 | ||
2160 | /** | |
2161 | * smack_ipc_permission - Smack access for ipc_permission() | |
2162 | * @ipp: the object permissions | |
2163 | * @flag: access requested | |
2164 | * | |
2165 | * Returns 0 if current has read and write access, error code otherwise | |
2166 | */ | |
2167 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2168 | { | |
2169 | char *isp = ipp->security; | |
ecfcc53f EB |
2170 | int may = smack_flags_to_may(flag); |
2171 | struct smk_audit_info ad; | |
e114e473 | 2172 | |
ecfcc53f EB |
2173 | #ifdef CONFIG_AUDIT |
2174 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2175 | ad.a.u.ipc_id = ipp->id; | |
2176 | #endif | |
2177 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2178 | } |
2179 | ||
d20bdda6 AD |
2180 | /** |
2181 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2182 | * @ipp: the object permissions |
d20bdda6 AD |
2183 | * @secid: where result will be saved |
2184 | */ | |
2185 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2186 | { | |
2187 | char *smack = ipp->security; | |
2188 | ||
2189 | *secid = smack_to_secid(smack); | |
2190 | } | |
2191 | ||
e114e473 CS |
2192 | /** |
2193 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2194 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2195 | * @inode: the object |
2196 | * | |
2197 | * Set the inode's security blob if it hasn't been done already. | |
2198 | */ | |
2199 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2200 | { | |
2201 | struct super_block *sbp; | |
2202 | struct superblock_smack *sbsp; | |
2203 | struct inode_smack *isp; | |
86a264ab | 2204 | char *csp = current_security(); |
e114e473 CS |
2205 | char *fetched; |
2206 | char *final; | |
2207 | struct dentry *dp; | |
2208 | ||
2209 | if (inode == NULL) | |
2210 | return; | |
2211 | ||
2212 | isp = inode->i_security; | |
2213 | ||
2214 | mutex_lock(&isp->smk_lock); | |
2215 | /* | |
2216 | * If the inode is already instantiated | |
2217 | * take the quick way out | |
2218 | */ | |
2219 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2220 | goto unlockandout; | |
2221 | ||
2222 | sbp = inode->i_sb; | |
2223 | sbsp = sbp->s_security; | |
2224 | /* | |
2225 | * We're going to use the superblock default label | |
2226 | * if there's no label on the file. | |
2227 | */ | |
2228 | final = sbsp->smk_default; | |
2229 | ||
e97dcb0e CS |
2230 | /* |
2231 | * If this is the root inode the superblock | |
2232 | * may be in the process of initialization. | |
2233 | * If that is the case use the root value out | |
2234 | * of the superblock. | |
2235 | */ | |
2236 | if (opt_dentry->d_parent == opt_dentry) { | |
2237 | isp->smk_inode = sbsp->smk_root; | |
2238 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2239 | goto unlockandout; | |
2240 | } | |
2241 | ||
e114e473 CS |
2242 | /* |
2243 | * This is pretty hackish. | |
2244 | * Casey says that we shouldn't have to do | |
2245 | * file system specific code, but it does help | |
2246 | * with keeping it simple. | |
2247 | */ | |
2248 | switch (sbp->s_magic) { | |
2249 | case SMACK_MAGIC: | |
2250 | /* | |
2251 | * Casey says that it's a little embarassing | |
2252 | * that the smack file system doesn't do | |
2253 | * extended attributes. | |
2254 | */ | |
2255 | final = smack_known_star.smk_known; | |
2256 | break; | |
2257 | case PIPEFS_MAGIC: | |
2258 | /* | |
2259 | * Casey says pipes are easy (?) | |
2260 | */ | |
2261 | final = smack_known_star.smk_known; | |
2262 | break; | |
2263 | case DEVPTS_SUPER_MAGIC: | |
2264 | /* | |
2265 | * devpts seems content with the label of the task. | |
2266 | * Programs that change smack have to treat the | |
2267 | * pty with respect. | |
2268 | */ | |
2269 | final = csp; | |
2270 | break; | |
2271 | case SOCKFS_MAGIC: | |
2272 | /* | |
b4e0d5f0 CS |
2273 | * Socket access is controlled by the socket |
2274 | * structures associated with the task involved. | |
e114e473 | 2275 | */ |
b4e0d5f0 | 2276 | final = smack_known_star.smk_known; |
e114e473 CS |
2277 | break; |
2278 | case PROC_SUPER_MAGIC: | |
2279 | /* | |
2280 | * Casey says procfs appears not to care. | |
2281 | * The superblock default suffices. | |
2282 | */ | |
2283 | break; | |
2284 | case TMPFS_MAGIC: | |
2285 | /* | |
2286 | * Device labels should come from the filesystem, | |
2287 | * but watch out, because they're volitile, | |
2288 | * getting recreated on every reboot. | |
2289 | */ | |
2290 | final = smack_known_star.smk_known; | |
2291 | /* | |
2292 | * No break. | |
2293 | * | |
2294 | * If a smack value has been set we want to use it, | |
2295 | * but since tmpfs isn't giving us the opportunity | |
2296 | * to set mount options simulate setting the | |
2297 | * superblock default. | |
2298 | */ | |
2299 | default: | |
2300 | /* | |
2301 | * This isn't an understood special case. | |
2302 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2303 | */ |
2304 | ||
2305 | /* | |
2306 | * UNIX domain sockets use lower level socket data. | |
2307 | */ | |
2308 | if (S_ISSOCK(inode->i_mode)) { | |
2309 | final = smack_known_star.smk_known; | |
2310 | break; | |
2311 | } | |
2312 | /* | |
e114e473 CS |
2313 | * No xattr support means, alas, no SMACK label. |
2314 | * Use the aforeapplied default. | |
2315 | * It would be curious if the label of the task | |
2316 | * does not match that assigned. | |
2317 | */ | |
2318 | if (inode->i_op->getxattr == NULL) | |
2319 | break; | |
2320 | /* | |
2321 | * Get the dentry for xattr. | |
2322 | */ | |
3e62cbb8 | 2323 | dp = dget(opt_dentry); |
e114e473 CS |
2324 | fetched = smk_fetch(inode, dp); |
2325 | if (fetched != NULL) | |
2326 | final = fetched; | |
e114e473 CS |
2327 | dput(dp); |
2328 | break; | |
2329 | } | |
2330 | ||
2331 | if (final == NULL) | |
2332 | isp->smk_inode = csp; | |
2333 | else | |
2334 | isp->smk_inode = final; | |
2335 | ||
2336 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2337 | ||
2338 | unlockandout: | |
2339 | mutex_unlock(&isp->smk_lock); | |
2340 | return; | |
2341 | } | |
2342 | ||
2343 | /** | |
2344 | * smack_getprocattr - Smack process attribute access | |
2345 | * @p: the object task | |
2346 | * @name: the name of the attribute in /proc/.../attr | |
2347 | * @value: where to put the result | |
2348 | * | |
2349 | * Places a copy of the task Smack into value | |
2350 | * | |
2351 | * Returns the length of the smack label or an error code | |
2352 | */ | |
2353 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2354 | { | |
2355 | char *cp; | |
2356 | int slen; | |
2357 | ||
2358 | if (strcmp(name, "current") != 0) | |
2359 | return -EINVAL; | |
2360 | ||
c69e8d9c | 2361 | cp = kstrdup(task_security(p), GFP_KERNEL); |
e114e473 CS |
2362 | if (cp == NULL) |
2363 | return -ENOMEM; | |
2364 | ||
2365 | slen = strlen(cp); | |
2366 | *value = cp; | |
2367 | return slen; | |
2368 | } | |
2369 | ||
2370 | /** | |
2371 | * smack_setprocattr - Smack process attribute setting | |
2372 | * @p: the object task | |
2373 | * @name: the name of the attribute in /proc/.../attr | |
2374 | * @value: the value to set | |
2375 | * @size: the size of the value | |
2376 | * | |
2377 | * Sets the Smack value of the task. Only setting self | |
2378 | * is permitted and only with privilege | |
2379 | * | |
2380 | * Returns the length of the smack label or an error code | |
2381 | */ | |
2382 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2383 | void *value, size_t size) | |
2384 | { | |
d84f4f99 | 2385 | struct cred *new; |
e114e473 CS |
2386 | char *newsmack; |
2387 | ||
e114e473 CS |
2388 | /* |
2389 | * Changing another process' Smack value is too dangerous | |
2390 | * and supports no sane use case. | |
2391 | */ | |
2392 | if (p != current) | |
2393 | return -EPERM; | |
2394 | ||
5cd9c58f DH |
2395 | if (!capable(CAP_MAC_ADMIN)) |
2396 | return -EPERM; | |
2397 | ||
e114e473 CS |
2398 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2399 | return -EINVAL; | |
2400 | ||
2401 | if (strcmp(name, "current") != 0) | |
2402 | return -EINVAL; | |
2403 | ||
2404 | newsmack = smk_import(value, size); | |
2405 | if (newsmack == NULL) | |
2406 | return -EINVAL; | |
2407 | ||
6d3dc07c CS |
2408 | /* |
2409 | * No process is ever allowed the web ("@") label. | |
2410 | */ | |
2411 | if (newsmack == smack_known_web.smk_known) | |
2412 | return -EPERM; | |
2413 | ||
d84f4f99 | 2414 | new = prepare_creds(); |
6d3dc07c | 2415 | if (new == NULL) |
d84f4f99 DH |
2416 | return -ENOMEM; |
2417 | new->security = newsmack; | |
2418 | commit_creds(new); | |
e114e473 CS |
2419 | return size; |
2420 | } | |
2421 | ||
2422 | /** | |
2423 | * smack_unix_stream_connect - Smack access on UDS | |
2424 | * @sock: one socket | |
2425 | * @other: the other socket | |
2426 | * @newsk: unused | |
2427 | * | |
2428 | * Return 0 if a subject with the smack of sock could access | |
2429 | * an object with the smack of other, otherwise an error code | |
2430 | */ | |
2431 | static int smack_unix_stream_connect(struct socket *sock, | |
2432 | struct socket *other, struct sock *newsk) | |
2433 | { | |
b4e0d5f0 CS |
2434 | struct socket_smack *ssp = sock->sk->sk_security; |
2435 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2436 | struct smk_audit_info ad; |
b4e0d5f0 | 2437 | int rc = 0; |
e114e473 | 2438 | |
ecfcc53f EB |
2439 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2440 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2441 | |
2442 | if (!capable(CAP_MAC_OVERRIDE)) | |
2443 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2444 | ||
2445 | return rc; | |
e114e473 CS |
2446 | } |
2447 | ||
2448 | /** | |
2449 | * smack_unix_may_send - Smack access on UDS | |
2450 | * @sock: one socket | |
2451 | * @other: the other socket | |
2452 | * | |
2453 | * Return 0 if a subject with the smack of sock could access | |
2454 | * an object with the smack of other, otherwise an error code | |
2455 | */ | |
2456 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2457 | { | |
b4e0d5f0 CS |
2458 | struct socket_smack *ssp = sock->sk->sk_security; |
2459 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2460 | struct smk_audit_info ad; |
b4e0d5f0 | 2461 | int rc = 0; |
e114e473 | 2462 | |
ecfcc53f EB |
2463 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2464 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2465 | |
2466 | if (!capable(CAP_MAC_OVERRIDE)) | |
2467 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2468 | ||
2469 | return rc; | |
e114e473 CS |
2470 | } |
2471 | ||
6d3dc07c CS |
2472 | /** |
2473 | * smack_socket_sendmsg - Smack check based on destination host | |
2474 | * @sock: the socket | |
251a2a95 | 2475 | * @msg: the message |
6d3dc07c CS |
2476 | * @size: the size of the message |
2477 | * | |
2478 | * Return 0 if the current subject can write to the destination | |
2479 | * host. This is only a question if the destination is a single | |
2480 | * label host. | |
2481 | */ | |
2482 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2483 | int size) | |
2484 | { | |
2485 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2486 | |
2487 | /* | |
2488 | * Perfectly reasonable for this to be NULL | |
2489 | */ | |
da34d424 | 2490 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2491 | return 0; |
2492 | ||
07feee8f | 2493 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2494 | } |
2495 | ||
2496 | ||
e114e473 | 2497 | /** |
251a2a95 | 2498 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2499 | * @sap: netlabel secattr |
2500 | * @sip: where to put the result | |
2501 | * | |
2502 | * Copies a smack label into sip | |
2503 | */ | |
2504 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2505 | { | |
2506 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2507 | char *sp; |
e114e473 CS |
2508 | int pcat; |
2509 | ||
6d3dc07c | 2510 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2511 | /* |
6d3dc07c | 2512 | * Looks like a CIPSO packet. |
e114e473 CS |
2513 | * If there are flags but no level netlabel isn't |
2514 | * behaving the way we expect it to. | |
2515 | * | |
6d3dc07c | 2516 | * Get the categories, if any |
e114e473 CS |
2517 | * Without guidance regarding the smack value |
2518 | * for the packet fall back on the network | |
2519 | * ambient value. | |
2520 | */ | |
6d3dc07c CS |
2521 | memset(smack, '\0', SMK_LABELLEN); |
2522 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2523 | for (pcat = -1;;) { | |
2524 | pcat = netlbl_secattr_catmap_walk( | |
2525 | sap->attr.mls.cat, pcat + 1); | |
2526 | if (pcat < 0) | |
2527 | break; | |
2528 | smack_catset_bit(pcat, smack); | |
2529 | } | |
2530 | /* | |
2531 | * If it is CIPSO using smack direct mapping | |
2532 | * we are already done. WeeHee. | |
2533 | */ | |
2534 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2535 | memcpy(sip, smack, SMK_MAXLEN); | |
2536 | return; | |
2537 | } | |
2538 | /* | |
2539 | * Look it up in the supplied table if it is not | |
2540 | * a direct mapping. | |
2541 | */ | |
2542 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2543 | return; |
2544 | } | |
6d3dc07c CS |
2545 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2546 | /* | |
2547 | * Looks like a fallback, which gives us a secid. | |
2548 | */ | |
2549 | sp = smack_from_secid(sap->attr.secid); | |
2550 | /* | |
2551 | * This has got to be a bug because it is | |
2552 | * impossible to specify a fallback without | |
2553 | * specifying the label, which will ensure | |
2554 | * it has a secid, and the only way to get a | |
2555 | * secid is from a fallback. | |
2556 | */ | |
2557 | BUG_ON(sp == NULL); | |
2558 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2559 | return; |
2560 | } | |
2561 | /* | |
6d3dc07c CS |
2562 | * Without guidance regarding the smack value |
2563 | * for the packet fall back on the network | |
2564 | * ambient value. | |
e114e473 | 2565 | */ |
6d3dc07c | 2566 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2567 | return; |
2568 | } | |
2569 | ||
2570 | /** | |
2571 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2572 | * @sk: socket | |
2573 | * @skb: packet | |
2574 | * | |
2575 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2576 | */ | |
2577 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2578 | { | |
2579 | struct netlbl_lsm_secattr secattr; | |
2580 | struct socket_smack *ssp = sk->sk_security; | |
2581 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2582 | char *csp; |
e114e473 | 2583 | int rc; |
ecfcc53f | 2584 | struct smk_audit_info ad; |
e114e473 CS |
2585 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2586 | return 0; | |
2587 | ||
2588 | /* | |
2589 | * Translate what netlabel gave us. | |
2590 | */ | |
e114e473 | 2591 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2592 | |
e114e473 | 2593 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2594 | if (rc == 0) { |
e114e473 | 2595 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2596 | csp = smack; |
2597 | } else | |
2598 | csp = smack_net_ambient; | |
2599 | ||
e114e473 | 2600 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2601 | |
ecfcc53f EB |
2602 | #ifdef CONFIG_AUDIT |
2603 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2604 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 2605 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2606 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2607 | #endif | |
e114e473 CS |
2608 | /* |
2609 | * Receiving a packet requires that the other end | |
2610 | * be able to write here. Read access is not required. | |
2611 | * This is the simplist possible security model | |
2612 | * for networking. | |
2613 | */ | |
ecfcc53f | 2614 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2615 | if (rc != 0) |
2616 | netlbl_skbuff_err(skb, rc, 0); | |
2617 | return rc; | |
e114e473 CS |
2618 | } |
2619 | ||
2620 | /** | |
2621 | * smack_socket_getpeersec_stream - pull in packet label | |
2622 | * @sock: the socket | |
2623 | * @optval: user's destination | |
2624 | * @optlen: size thereof | |
251a2a95 | 2625 | * @len: max thereof |
e114e473 CS |
2626 | * |
2627 | * returns zero on success, an error code otherwise | |
2628 | */ | |
2629 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2630 | char __user *optval, | |
2631 | int __user *optlen, unsigned len) | |
2632 | { | |
2633 | struct socket_smack *ssp; | |
2634 | int slen; | |
2635 | int rc = 0; | |
2636 | ||
2637 | ssp = sock->sk->sk_security; | |
2638 | slen = strlen(ssp->smk_packet) + 1; | |
2639 | ||
2640 | if (slen > len) | |
2641 | rc = -ERANGE; | |
2642 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2643 | rc = -EFAULT; | |
2644 | ||
2645 | if (put_user(slen, optlen) != 0) | |
2646 | rc = -EFAULT; | |
2647 | ||
2648 | return rc; | |
2649 | } | |
2650 | ||
2651 | ||
2652 | /** | |
2653 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 2654 | * @sock: the peer socket |
e114e473 CS |
2655 | * @skb: packet data |
2656 | * @secid: pointer to where to put the secid of the packet | |
2657 | * | |
2658 | * Sets the netlabel socket state on sk from parent | |
2659 | */ | |
2660 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2661 | struct sk_buff *skb, u32 *secid) | |
2662 | ||
2663 | { | |
2664 | struct netlbl_lsm_secattr secattr; | |
b4e0d5f0 | 2665 | struct socket_smack *sp; |
e114e473 | 2666 | char smack[SMK_LABELLEN]; |
b4e0d5f0 CS |
2667 | int family = PF_UNSPEC; |
2668 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
2669 | int rc; |
2670 | ||
b4e0d5f0 CS |
2671 | if (skb != NULL) { |
2672 | if (skb->protocol == htons(ETH_P_IP)) | |
2673 | family = PF_INET; | |
2674 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
2675 | family = PF_INET6; | |
e114e473 | 2676 | } |
b4e0d5f0 CS |
2677 | if (family == PF_UNSPEC && sock != NULL) |
2678 | family = sock->sk->sk_family; | |
e114e473 | 2679 | |
b4e0d5f0 CS |
2680 | if (family == PF_UNIX) { |
2681 | sp = sock->sk->sk_security; | |
2682 | s = smack_to_secid(sp->smk_out); | |
2683 | } else if (family == PF_INET || family == PF_INET6) { | |
2684 | /* | |
2685 | * Translate what netlabel gave us. | |
2686 | */ | |
2687 | netlbl_secattr_init(&secattr); | |
2688 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2689 | if (rc == 0) { | |
2690 | smack_from_secattr(&secattr, smack); | |
2691 | s = smack_to_secid(smack); | |
2692 | } | |
2693 | netlbl_secattr_destroy(&secattr); | |
2694 | } | |
2695 | *secid = s; | |
e114e473 CS |
2696 | if (s == 0) |
2697 | return -EINVAL; | |
e114e473 CS |
2698 | return 0; |
2699 | } | |
2700 | ||
2701 | /** | |
07feee8f PM |
2702 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2703 | * @sk: child sock | |
2704 | * @parent: parent socket | |
e114e473 | 2705 | * |
07feee8f PM |
2706 | * Set the smk_{in,out} state of an existing sock based on the process that |
2707 | * is creating the new socket. | |
e114e473 CS |
2708 | */ |
2709 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2710 | { | |
2711 | struct socket_smack *ssp; | |
e114e473 | 2712 | |
07feee8f PM |
2713 | if (sk == NULL || |
2714 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
2715 | return; |
2716 | ||
2717 | ssp = sk->sk_security; | |
86a264ab | 2718 | ssp->smk_in = ssp->smk_out = current_security(); |
07feee8f | 2719 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
2720 | } |
2721 | ||
2722 | /** | |
2723 | * smack_inet_conn_request - Smack access check on connect | |
2724 | * @sk: socket involved | |
2725 | * @skb: packet | |
2726 | * @req: unused | |
2727 | * | |
2728 | * Returns 0 if a task with the packet label could write to | |
2729 | * the socket, otherwise an error code | |
2730 | */ | |
2731 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2732 | struct request_sock *req) | |
2733 | { | |
07feee8f | 2734 | u16 family = sk->sk_family; |
e114e473 | 2735 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
2736 | struct netlbl_lsm_secattr secattr; |
2737 | struct sockaddr_in addr; | |
2738 | struct iphdr *hdr; | |
e114e473 CS |
2739 | char smack[SMK_LABELLEN]; |
2740 | int rc; | |
ecfcc53f | 2741 | struct smk_audit_info ad; |
e114e473 | 2742 | |
07feee8f PM |
2743 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2744 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
2745 | family = PF_INET; | |
e114e473 | 2746 | |
07feee8f PM |
2747 | netlbl_secattr_init(&secattr); |
2748 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 2749 | if (rc == 0) |
07feee8f | 2750 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
2751 | else |
2752 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
2753 | netlbl_secattr_destroy(&secattr); |
2754 | ||
ecfcc53f EB |
2755 | #ifdef CONFIG_AUDIT |
2756 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2757 | ad.a.u.net.family = family; | |
8964be4a | 2758 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2759 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2760 | #endif | |
e114e473 | 2761 | /* |
07feee8f PM |
2762 | * Receiving a packet requires that the other end be able to write |
2763 | * here. Read access is not required. | |
e114e473 | 2764 | */ |
ecfcc53f | 2765 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
2766 | if (rc != 0) |
2767 | return rc; | |
2768 | ||
2769 | /* | |
2770 | * Save the peer's label in the request_sock so we can later setup | |
2771 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
2772 | */ | |
2773 | req->peer_secid = smack_to_secid(smack); | |
2774 | ||
2775 | /* | |
2776 | * We need to decide if we want to label the incoming connection here | |
2777 | * if we do we only need to label the request_sock and the stack will | |
2778 | * propogate the wire-label to the sock when it is created. | |
2779 | */ | |
2780 | hdr = ip_hdr(skb); | |
2781 | addr.sin_addr.s_addr = hdr->saddr; | |
2782 | rcu_read_lock(); | |
2783 | if (smack_host_label(&addr) == NULL) { | |
2784 | rcu_read_unlock(); | |
2785 | netlbl_secattr_init(&secattr); | |
2786 | smack_to_secattr(smack, &secattr); | |
2787 | rc = netlbl_req_setattr(req, &secattr); | |
2788 | netlbl_secattr_destroy(&secattr); | |
2789 | } else { | |
2790 | rcu_read_unlock(); | |
2791 | netlbl_req_delattr(req); | |
2792 | } | |
e114e473 CS |
2793 | |
2794 | return rc; | |
2795 | } | |
2796 | ||
07feee8f PM |
2797 | /** |
2798 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
2799 | * @sk: the new socket | |
2800 | * @req: the connection's request_sock | |
2801 | * | |
2802 | * Transfer the connection's peer label to the newly created socket. | |
2803 | */ | |
2804 | static void smack_inet_csk_clone(struct sock *sk, | |
2805 | const struct request_sock *req) | |
2806 | { | |
2807 | struct socket_smack *ssp = sk->sk_security; | |
2808 | char *smack; | |
2809 | ||
2810 | if (req->peer_secid != 0) { | |
2811 | smack = smack_from_secid(req->peer_secid); | |
2812 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2813 | } else | |
2814 | ssp->smk_packet[0] = '\0'; | |
2815 | } | |
2816 | ||
e114e473 CS |
2817 | /* |
2818 | * Key management security hooks | |
2819 | * | |
2820 | * Casey has not tested key support very heavily. | |
2821 | * The permission check is most likely too restrictive. | |
2822 | * If you care about keys please have a look. | |
2823 | */ | |
2824 | #ifdef CONFIG_KEYS | |
2825 | ||
2826 | /** | |
2827 | * smack_key_alloc - Set the key security blob | |
2828 | * @key: object | |
d84f4f99 | 2829 | * @cred: the credentials to use |
e114e473 CS |
2830 | * @flags: unused |
2831 | * | |
2832 | * No allocation required | |
2833 | * | |
2834 | * Returns 0 | |
2835 | */ | |
d84f4f99 | 2836 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
2837 | unsigned long flags) |
2838 | { | |
d84f4f99 | 2839 | key->security = cred->security; |
e114e473 CS |
2840 | return 0; |
2841 | } | |
2842 | ||
2843 | /** | |
2844 | * smack_key_free - Clear the key security blob | |
2845 | * @key: the object | |
2846 | * | |
2847 | * Clear the blob pointer | |
2848 | */ | |
2849 | static void smack_key_free(struct key *key) | |
2850 | { | |
2851 | key->security = NULL; | |
2852 | } | |
2853 | ||
2854 | /* | |
2855 | * smack_key_permission - Smack access on a key | |
2856 | * @key_ref: gets to the object | |
d84f4f99 | 2857 | * @cred: the credentials to use |
e114e473 CS |
2858 | * @perm: unused |
2859 | * | |
2860 | * Return 0 if the task has read and write to the object, | |
2861 | * an error code otherwise | |
2862 | */ | |
2863 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 2864 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
2865 | { |
2866 | struct key *keyp; | |
ecfcc53f | 2867 | struct smk_audit_info ad; |
e114e473 CS |
2868 | |
2869 | keyp = key_ref_to_ptr(key_ref); | |
2870 | if (keyp == NULL) | |
2871 | return -EINVAL; | |
2872 | /* | |
2873 | * If the key hasn't been initialized give it access so that | |
2874 | * it may do so. | |
2875 | */ | |
2876 | if (keyp->security == NULL) | |
2877 | return 0; | |
2878 | /* | |
2879 | * This should not occur | |
2880 | */ | |
d84f4f99 | 2881 | if (cred->security == NULL) |
e114e473 | 2882 | return -EACCES; |
ecfcc53f EB |
2883 | #ifdef CONFIG_AUDIT |
2884 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
2885 | ad.a.u.key_struct.key = keyp->serial; | |
2886 | ad.a.u.key_struct.key_desc = keyp->description; | |
2887 | #endif | |
2888 | return smk_access(cred->security, keyp->security, | |
2889 | MAY_READWRITE, &ad); | |
e114e473 CS |
2890 | } |
2891 | #endif /* CONFIG_KEYS */ | |
2892 | ||
d20bdda6 AD |
2893 | /* |
2894 | * Smack Audit hooks | |
2895 | * | |
2896 | * Audit requires a unique representation of each Smack specific | |
2897 | * rule. This unique representation is used to distinguish the | |
2898 | * object to be audited from remaining kernel objects and also | |
2899 | * works as a glue between the audit hooks. | |
2900 | * | |
2901 | * Since repository entries are added but never deleted, we'll use | |
2902 | * the smack_known label address related to the given audit rule as | |
2903 | * the needed unique representation. This also better fits the smack | |
2904 | * model where nearly everything is a label. | |
2905 | */ | |
2906 | #ifdef CONFIG_AUDIT | |
2907 | ||
2908 | /** | |
2909 | * smack_audit_rule_init - Initialize a smack audit rule | |
2910 | * @field: audit rule fields given from user-space (audit.h) | |
2911 | * @op: required testing operator (=, !=, >, <, ...) | |
2912 | * @rulestr: smack label to be audited | |
2913 | * @vrule: pointer to save our own audit rule representation | |
2914 | * | |
2915 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2916 | * The label to be audited is created if necessay. | |
2917 | */ | |
2918 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2919 | { | |
2920 | char **rule = (char **)vrule; | |
2921 | *rule = NULL; | |
2922 | ||
2923 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2924 | return -EINVAL; | |
2925 | ||
5af75d8d | 2926 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
2927 | return -EINVAL; |
2928 | ||
2929 | *rule = smk_import(rulestr, 0); | |
2930 | ||
2931 | return 0; | |
2932 | } | |
2933 | ||
2934 | /** | |
2935 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2936 | * @krule: rule of interest, in Audit kernel representation format | |
2937 | * | |
2938 | * This is used to filter Smack rules from remaining Audit ones. | |
2939 | * If it's proved that this rule belongs to us, the | |
2940 | * audit_rule_match hook will be called to do the final judgement. | |
2941 | */ | |
2942 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2943 | { | |
2944 | struct audit_field *f; | |
2945 | int i; | |
2946 | ||
2947 | for (i = 0; i < krule->field_count; i++) { | |
2948 | f = &krule->fields[i]; | |
2949 | ||
2950 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2951 | return 1; | |
2952 | } | |
2953 | ||
2954 | return 0; | |
2955 | } | |
2956 | ||
2957 | /** | |
2958 | * smack_audit_rule_match - Audit given object ? | |
2959 | * @secid: security id for identifying the object to test | |
2960 | * @field: audit rule flags given from user-space | |
2961 | * @op: required testing operator | |
2962 | * @vrule: smack internal rule presentation | |
2963 | * @actx: audit context associated with the check | |
2964 | * | |
2965 | * The core Audit hook. It's used to take the decision of | |
2966 | * whether to audit or not to audit a given object. | |
2967 | */ | |
2968 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2969 | struct audit_context *actx) | |
2970 | { | |
2971 | char *smack; | |
2972 | char *rule = vrule; | |
2973 | ||
2974 | if (!rule) { | |
2975 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2976 | "Smack: missing rule\n"); | |
2977 | return -ENOENT; | |
2978 | } | |
2979 | ||
2980 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2981 | return 0; | |
2982 | ||
2983 | smack = smack_from_secid(secid); | |
2984 | ||
2985 | /* | |
2986 | * No need to do string comparisons. If a match occurs, | |
2987 | * both pointers will point to the same smack_known | |
2988 | * label. | |
2989 | */ | |
5af75d8d | 2990 | if (op == Audit_equal) |
d20bdda6 | 2991 | return (rule == smack); |
5af75d8d | 2992 | if (op == Audit_not_equal) |
d20bdda6 AD |
2993 | return (rule != smack); |
2994 | ||
2995 | return 0; | |
2996 | } | |
2997 | ||
2998 | /** | |
2999 | * smack_audit_rule_free - free smack rule representation | |
3000 | * @vrule: rule to be freed. | |
3001 | * | |
3002 | * No memory was allocated. | |
3003 | */ | |
3004 | static void smack_audit_rule_free(void *vrule) | |
3005 | { | |
3006 | /* No-op */ | |
3007 | } | |
3008 | ||
3009 | #endif /* CONFIG_AUDIT */ | |
3010 | ||
251a2a95 | 3011 | /** |
e114e473 CS |
3012 | * smack_secid_to_secctx - return the smack label for a secid |
3013 | * @secid: incoming integer | |
3014 | * @secdata: destination | |
3015 | * @seclen: how long it is | |
3016 | * | |
3017 | * Exists for networking code. | |
3018 | */ | |
3019 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3020 | { | |
3021 | char *sp = smack_from_secid(secid); | |
3022 | ||
d5630b9d EP |
3023 | if (secdata) |
3024 | *secdata = sp; | |
e114e473 CS |
3025 | *seclen = strlen(sp); |
3026 | return 0; | |
3027 | } | |
3028 | ||
251a2a95 | 3029 | /** |
4bc87e62 CS |
3030 | * smack_secctx_to_secid - return the secid for a smack label |
3031 | * @secdata: smack label | |
3032 | * @seclen: how long result is | |
3033 | * @secid: outgoing integer | |
3034 | * | |
3035 | * Exists for audit and networking code. | |
3036 | */ | |
e52c1764 | 3037 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3038 | { |
3039 | *secid = smack_to_secid(secdata); | |
3040 | return 0; | |
3041 | } | |
3042 | ||
251a2a95 | 3043 | /** |
e114e473 | 3044 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3045 | * @secdata: unused |
3046 | * @seclen: unused | |
e114e473 CS |
3047 | * |
3048 | * Exists to make sure nothing gets done, and properly | |
3049 | */ | |
3050 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3051 | { | |
3052 | } | |
3053 | ||
1ee65e37 DQ |
3054 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3055 | { | |
3056 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3057 | } | |
3058 | ||
3059 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3060 | { | |
3061 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3062 | } | |
3063 | ||
3064 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3065 | { | |
3066 | int len = 0; | |
3067 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3068 | ||
3069 | if (len < 0) | |
3070 | return len; | |
3071 | *ctxlen = len; | |
3072 | return 0; | |
3073 | } | |
3074 | ||
076c54c5 AD |
3075 | struct security_operations smack_ops = { |
3076 | .name = "smack", | |
3077 | ||
9e48858f | 3078 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3079 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3080 | .syslog = smack_syslog, |
e114e473 CS |
3081 | |
3082 | .sb_alloc_security = smack_sb_alloc_security, | |
3083 | .sb_free_security = smack_sb_free_security, | |
3084 | .sb_copy_data = smack_sb_copy_data, | |
3085 | .sb_kern_mount = smack_sb_kern_mount, | |
3086 | .sb_statfs = smack_sb_statfs, | |
3087 | .sb_mount = smack_sb_mount, | |
3088 | .sb_umount = smack_sb_umount, | |
3089 | ||
3090 | .inode_alloc_security = smack_inode_alloc_security, | |
3091 | .inode_free_security = smack_inode_free_security, | |
3092 | .inode_init_security = smack_inode_init_security, | |
3093 | .inode_link = smack_inode_link, | |
3094 | .inode_unlink = smack_inode_unlink, | |
3095 | .inode_rmdir = smack_inode_rmdir, | |
3096 | .inode_rename = smack_inode_rename, | |
3097 | .inode_permission = smack_inode_permission, | |
3098 | .inode_setattr = smack_inode_setattr, | |
3099 | .inode_getattr = smack_inode_getattr, | |
3100 | .inode_setxattr = smack_inode_setxattr, | |
3101 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3102 | .inode_getxattr = smack_inode_getxattr, | |
3103 | .inode_removexattr = smack_inode_removexattr, | |
3104 | .inode_getsecurity = smack_inode_getsecurity, | |
3105 | .inode_setsecurity = smack_inode_setsecurity, | |
3106 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3107 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3108 | |
3109 | .file_permission = smack_file_permission, | |
3110 | .file_alloc_security = smack_file_alloc_security, | |
3111 | .file_free_security = smack_file_free_security, | |
3112 | .file_ioctl = smack_file_ioctl, | |
3113 | .file_lock = smack_file_lock, | |
3114 | .file_fcntl = smack_file_fcntl, | |
3115 | .file_set_fowner = smack_file_set_fowner, | |
3116 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3117 | .file_receive = smack_file_receive, | |
3118 | ||
ee18d64c | 3119 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3120 | .cred_free = smack_cred_free, |
d84f4f99 | 3121 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3122 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3123 | .kernel_act_as = smack_kernel_act_as, |
3124 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3125 | .task_setpgid = smack_task_setpgid, |
3126 | .task_getpgid = smack_task_getpgid, | |
3127 | .task_getsid = smack_task_getsid, | |
3128 | .task_getsecid = smack_task_getsecid, | |
3129 | .task_setnice = smack_task_setnice, | |
3130 | .task_setioprio = smack_task_setioprio, | |
3131 | .task_getioprio = smack_task_getioprio, | |
3132 | .task_setscheduler = smack_task_setscheduler, | |
3133 | .task_getscheduler = smack_task_getscheduler, | |
3134 | .task_movememory = smack_task_movememory, | |
3135 | .task_kill = smack_task_kill, | |
3136 | .task_wait = smack_task_wait, | |
e114e473 CS |
3137 | .task_to_inode = smack_task_to_inode, |
3138 | ||
3139 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3140 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3141 | |
3142 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3143 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3144 | ||
3145 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3146 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3147 | .msg_queue_associate = smack_msg_queue_associate, | |
3148 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3149 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3150 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3151 | ||
3152 | .shm_alloc_security = smack_shm_alloc_security, | |
3153 | .shm_free_security = smack_shm_free_security, | |
3154 | .shm_associate = smack_shm_associate, | |
3155 | .shm_shmctl = smack_shm_shmctl, | |
3156 | .shm_shmat = smack_shm_shmat, | |
3157 | ||
3158 | .sem_alloc_security = smack_sem_alloc_security, | |
3159 | .sem_free_security = smack_sem_free_security, | |
3160 | .sem_associate = smack_sem_associate, | |
3161 | .sem_semctl = smack_sem_semctl, | |
3162 | .sem_semop = smack_sem_semop, | |
3163 | ||
e114e473 CS |
3164 | .d_instantiate = smack_d_instantiate, |
3165 | ||
3166 | .getprocattr = smack_getprocattr, | |
3167 | .setprocattr = smack_setprocattr, | |
3168 | ||
3169 | .unix_stream_connect = smack_unix_stream_connect, | |
3170 | .unix_may_send = smack_unix_may_send, | |
3171 | ||
3172 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3173 | .socket_connect = smack_socket_connect, |
3174 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3175 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3176 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3177 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3178 | .sk_alloc_security = smack_sk_alloc_security, | |
3179 | .sk_free_security = smack_sk_free_security, | |
3180 | .sock_graft = smack_sock_graft, | |
3181 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3182 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3183 | |
e114e473 CS |
3184 | /* key management security hooks */ |
3185 | #ifdef CONFIG_KEYS | |
3186 | .key_alloc = smack_key_alloc, | |
3187 | .key_free = smack_key_free, | |
3188 | .key_permission = smack_key_permission, | |
3189 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3190 | |
3191 | /* Audit hooks */ | |
3192 | #ifdef CONFIG_AUDIT | |
3193 | .audit_rule_init = smack_audit_rule_init, | |
3194 | .audit_rule_known = smack_audit_rule_known, | |
3195 | .audit_rule_match = smack_audit_rule_match, | |
3196 | .audit_rule_free = smack_audit_rule_free, | |
3197 | #endif /* CONFIG_AUDIT */ | |
3198 | ||
e114e473 | 3199 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3200 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3201 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3202 | .inode_notifysecctx = smack_inode_notifysecctx, |
3203 | .inode_setsecctx = smack_inode_setsecctx, | |
3204 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3205 | }; |
3206 | ||
7198e2ee EB |
3207 | |
3208 | static __init void init_smack_know_list(void) | |
3209 | { | |
3210 | list_add(&smack_known_huh.list, &smack_known_list); | |
3211 | list_add(&smack_known_hat.list, &smack_known_list); | |
3212 | list_add(&smack_known_star.list, &smack_known_list); | |
3213 | list_add(&smack_known_floor.list, &smack_known_list); | |
3214 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3215 | list_add(&smack_known_web.list, &smack_known_list); | |
3216 | } | |
3217 | ||
e114e473 CS |
3218 | /** |
3219 | * smack_init - initialize the smack system | |
3220 | * | |
3221 | * Returns 0 | |
3222 | */ | |
3223 | static __init int smack_init(void) | |
3224 | { | |
d84f4f99 DH |
3225 | struct cred *cred; |
3226 | ||
076c54c5 AD |
3227 | if (!security_module_enable(&smack_ops)) |
3228 | return 0; | |
3229 | ||
e114e473 CS |
3230 | printk(KERN_INFO "Smack: Initializing.\n"); |
3231 | ||
3232 | /* | |
3233 | * Set the security state for the initial task. | |
3234 | */ | |
d84f4f99 DH |
3235 | cred = (struct cred *) current->cred; |
3236 | cred->security = &smack_known_floor.smk_known; | |
e114e473 | 3237 | |
421f91d2 | 3238 | /* initialize the smack_know_list */ |
7198e2ee | 3239 | init_smack_know_list(); |
e114e473 CS |
3240 | /* |
3241 | * Initialize locks | |
3242 | */ | |
e114e473 CS |
3243 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3244 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3245 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3246 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3247 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3248 | ||
3249 | /* | |
3250 | * Register with LSM | |
3251 | */ | |
3252 | if (register_security(&smack_ops)) | |
3253 | panic("smack: Unable to register with kernel.\n"); | |
3254 | ||
3255 | return 0; | |
3256 | } | |
3257 | ||
3258 | /* | |
3259 | * Smack requires early initialization in order to label | |
3260 | * all processes and objects when they are created. | |
3261 | */ | |
3262 | security_initcall(smack_init); |