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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> | |
22 | #include <linux/ext2_fs.h> | |
23 | #include <linux/kd.h> | |
24 | #include <asm/ioctls.h> | |
07feee8f | 25 | #include <linux/ip.h> |
e114e473 CS |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
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> |
e114e473 CS |
33 | |
34 | #include "smack.h" | |
35 | ||
c69e8d9c DH |
36 | #define task_security(task) (task_cred_xxx((task), security)) |
37 | ||
e114e473 CS |
38 | /* |
39 | * I hope these are the hokeyist lines of code in the module. Casey. | |
40 | */ | |
41 | #define DEVPTS_SUPER_MAGIC 0x1cd1 | |
42 | #define SOCKFS_MAGIC 0x534F434B | |
43 | #define TMPFS_MAGIC 0x01021994 | |
44 | ||
45 | /** | |
46 | * smk_fetch - Fetch the smack label from a file. | |
47 | * @ip: a pointer to the inode | |
48 | * @dp: a pointer to the dentry | |
49 | * | |
50 | * Returns a pointer to the master list entry for the Smack label | |
51 | * or NULL if there was no label to fetch. | |
52 | */ | |
53 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
54 | { | |
55 | int rc; | |
56 | char in[SMK_LABELLEN]; | |
57 | ||
58 | if (ip->i_op->getxattr == NULL) | |
59 | return NULL; | |
60 | ||
61 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
62 | if (rc < 0) | |
63 | return NULL; | |
64 | ||
65 | return smk_import(in, rc); | |
66 | } | |
67 | ||
68 | /** | |
69 | * new_inode_smack - allocate an inode security blob | |
70 | * @smack: a pointer to the Smack label to use in the blob | |
71 | * | |
72 | * Returns the new blob or NULL if there's no memory available | |
73 | */ | |
74 | struct inode_smack *new_inode_smack(char *smack) | |
75 | { | |
76 | struct inode_smack *isp; | |
77 | ||
78 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
79 | if (isp == NULL) | |
80 | return NULL; | |
81 | ||
82 | isp->smk_inode = smack; | |
83 | isp->smk_flags = 0; | |
84 | mutex_init(&isp->smk_lock); | |
85 | ||
86 | return isp; | |
87 | } | |
88 | ||
89 | /* | |
90 | * LSM hooks. | |
91 | * We he, that is fun! | |
92 | */ | |
93 | ||
94 | /** | |
5cd9c58f | 95 | * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH |
e114e473 | 96 | * @ctp: child task pointer |
251a2a95 | 97 | * @mode: ptrace attachment mode |
e114e473 CS |
98 | * |
99 | * Returns 0 if access is OK, an error code otherwise | |
100 | * | |
101 | * Do the capability checks, and require read and write. | |
102 | */ | |
5cd9c58f | 103 | static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
104 | { |
105 | int rc; | |
106 | ||
5cd9c58f | 107 | rc = cap_ptrace_may_access(ctp, mode); |
e114e473 CS |
108 | if (rc != 0) |
109 | return rc; | |
110 | ||
d84f4f99 | 111 | rc = smk_access(current_security(), task_security(ctp), MAY_READWRITE); |
5cd9c58f | 112 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
e114e473 | 113 | return 0; |
5cd9c58f DH |
114 | return rc; |
115 | } | |
116 | ||
117 | /** | |
118 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
119 | * @ptp: parent task pointer | |
120 | * | |
121 | * Returns 0 if access is OK, an error code otherwise | |
122 | * | |
123 | * Do the capability checks, and require read and write. | |
124 | */ | |
125 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
126 | { | |
127 | int rc; | |
128 | ||
129 | rc = cap_ptrace_traceme(ptp); | |
130 | if (rc != 0) | |
131 | return rc; | |
e114e473 | 132 | |
d84f4f99 | 133 | rc = smk_access(task_security(ptp), current_security(), MAY_READWRITE); |
5cd9c58f DH |
134 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
135 | return 0; | |
e114e473 CS |
136 | return rc; |
137 | } | |
138 | ||
139 | /** | |
140 | * smack_syslog - Smack approval on syslog | |
141 | * @type: message type | |
142 | * | |
143 | * Require that the task has the floor label | |
144 | * | |
145 | * Returns 0 on success, error code otherwise. | |
146 | */ | |
147 | static int smack_syslog(int type) | |
148 | { | |
149 | int rc; | |
86a264ab | 150 | char *sp = current_security(); |
e114e473 CS |
151 | |
152 | rc = cap_syslog(type); | |
153 | if (rc != 0) | |
154 | return rc; | |
155 | ||
156 | if (capable(CAP_MAC_OVERRIDE)) | |
157 | return 0; | |
158 | ||
159 | if (sp != smack_known_floor.smk_known) | |
160 | rc = -EACCES; | |
161 | ||
162 | return rc; | |
163 | } | |
164 | ||
165 | ||
166 | /* | |
167 | * Superblock Hooks. | |
168 | */ | |
169 | ||
170 | /** | |
171 | * smack_sb_alloc_security - allocate a superblock blob | |
172 | * @sb: the superblock getting the blob | |
173 | * | |
174 | * Returns 0 on success or -ENOMEM on error. | |
175 | */ | |
176 | static int smack_sb_alloc_security(struct super_block *sb) | |
177 | { | |
178 | struct superblock_smack *sbsp; | |
179 | ||
180 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
181 | ||
182 | if (sbsp == NULL) | |
183 | return -ENOMEM; | |
184 | ||
185 | sbsp->smk_root = smack_known_floor.smk_known; | |
186 | sbsp->smk_default = smack_known_floor.smk_known; | |
187 | sbsp->smk_floor = smack_known_floor.smk_known; | |
188 | sbsp->smk_hat = smack_known_hat.smk_known; | |
189 | sbsp->smk_initialized = 0; | |
190 | spin_lock_init(&sbsp->smk_sblock); | |
191 | ||
192 | sb->s_security = sbsp; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | /** | |
198 | * smack_sb_free_security - free a superblock blob | |
199 | * @sb: the superblock getting the blob | |
200 | * | |
201 | */ | |
202 | static void smack_sb_free_security(struct super_block *sb) | |
203 | { | |
204 | kfree(sb->s_security); | |
205 | sb->s_security = NULL; | |
206 | } | |
207 | ||
208 | /** | |
209 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 210 | * @orig: where to start |
251a2a95 | 211 | * @smackopts: mount options string |
e114e473 CS |
212 | * |
213 | * Returns 0 on success or -ENOMEM on error. | |
214 | * | |
215 | * Copy the Smack specific mount options out of the mount | |
216 | * options list. | |
217 | */ | |
e0007529 | 218 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
219 | { |
220 | char *cp, *commap, *otheropts, *dp; | |
221 | ||
e114e473 CS |
222 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
223 | if (otheropts == NULL) | |
224 | return -ENOMEM; | |
225 | ||
226 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
227 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
228 | dp = smackopts; | |
229 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
230 | dp = smackopts; | |
231 | else if (strstr(cp, SMK_FSHAT) == cp) | |
232 | dp = smackopts; | |
233 | else if (strstr(cp, SMK_FSROOT) == cp) | |
234 | dp = smackopts; | |
235 | else | |
236 | dp = otheropts; | |
237 | ||
238 | commap = strchr(cp, ','); | |
239 | if (commap != NULL) | |
240 | *commap = '\0'; | |
241 | ||
242 | if (*dp != '\0') | |
243 | strcat(dp, ","); | |
244 | strcat(dp, cp); | |
245 | } | |
246 | ||
247 | strcpy(orig, otheropts); | |
248 | free_page((unsigned long)otheropts); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /** | |
254 | * smack_sb_kern_mount - Smack specific mount processing | |
255 | * @sb: the file system superblock | |
12204e24 | 256 | * @flags: the mount flags |
e114e473 CS |
257 | * @data: the smack mount options |
258 | * | |
259 | * Returns 0 on success, an error code on failure | |
260 | */ | |
12204e24 | 261 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
262 | { |
263 | struct dentry *root = sb->s_root; | |
264 | struct inode *inode = root->d_inode; | |
265 | struct superblock_smack *sp = sb->s_security; | |
266 | struct inode_smack *isp; | |
267 | char *op; | |
268 | char *commap; | |
269 | char *nsp; | |
270 | ||
271 | spin_lock(&sp->smk_sblock); | |
272 | if (sp->smk_initialized != 0) { | |
273 | spin_unlock(&sp->smk_sblock); | |
274 | return 0; | |
275 | } | |
276 | sp->smk_initialized = 1; | |
277 | spin_unlock(&sp->smk_sblock); | |
278 | ||
279 | for (op = data; op != NULL; op = commap) { | |
280 | commap = strchr(op, ','); | |
281 | if (commap != NULL) | |
282 | *commap++ = '\0'; | |
283 | ||
284 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
285 | op += strlen(SMK_FSHAT); | |
286 | nsp = smk_import(op, 0); | |
287 | if (nsp != NULL) | |
288 | sp->smk_hat = nsp; | |
289 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
290 | op += strlen(SMK_FSFLOOR); | |
291 | nsp = smk_import(op, 0); | |
292 | if (nsp != NULL) | |
293 | sp->smk_floor = nsp; | |
294 | } else if (strncmp(op, SMK_FSDEFAULT, | |
295 | strlen(SMK_FSDEFAULT)) == 0) { | |
296 | op += strlen(SMK_FSDEFAULT); | |
297 | nsp = smk_import(op, 0); | |
298 | if (nsp != NULL) | |
299 | sp->smk_default = nsp; | |
300 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
301 | op += strlen(SMK_FSROOT); | |
302 | nsp = smk_import(op, 0); | |
303 | if (nsp != NULL) | |
304 | sp->smk_root = nsp; | |
305 | } | |
306 | } | |
307 | ||
308 | /* | |
309 | * Initialize the root inode. | |
310 | */ | |
311 | isp = inode->i_security; | |
312 | if (isp == NULL) | |
313 | inode->i_security = new_inode_smack(sp->smk_root); | |
314 | else | |
315 | isp->smk_inode = sp->smk_root; | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | /** | |
321 | * smack_sb_statfs - Smack check on statfs | |
322 | * @dentry: identifies the file system in question | |
323 | * | |
324 | * Returns 0 if current can read the floor of the filesystem, | |
325 | * and error code otherwise | |
326 | */ | |
327 | static int smack_sb_statfs(struct dentry *dentry) | |
328 | { | |
329 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
330 | ||
331 | return smk_curacc(sbp->smk_floor, MAY_READ); | |
332 | } | |
333 | ||
334 | /** | |
335 | * smack_sb_mount - Smack check for mounting | |
336 | * @dev_name: unused | |
251a2a95 | 337 | * @path: mount point |
e114e473 CS |
338 | * @type: unused |
339 | * @flags: unused | |
340 | * @data: unused | |
341 | * | |
342 | * Returns 0 if current can write the floor of the filesystem | |
343 | * being mounted on, an error code otherwise. | |
344 | */ | |
b5266eb4 | 345 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
346 | char *type, unsigned long flags, void *data) |
347 | { | |
b5266eb4 | 348 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
e114e473 CS |
349 | |
350 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
351 | } | |
352 | ||
353 | /** | |
354 | * smack_sb_umount - Smack check for unmounting | |
355 | * @mnt: file system to unmount | |
356 | * @flags: unused | |
357 | * | |
358 | * Returns 0 if current can write the floor of the filesystem | |
359 | * being unmounted, an error code otherwise. | |
360 | */ | |
361 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
362 | { | |
363 | struct superblock_smack *sbp; | |
364 | ||
365 | sbp = mnt->mnt_sb->s_security; | |
366 | ||
367 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
368 | } | |
369 | ||
370 | /* | |
371 | * Inode hooks | |
372 | */ | |
373 | ||
374 | /** | |
375 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 376 | * @inode: the inode in need of a blob |
e114e473 CS |
377 | * |
378 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
379 | */ | |
380 | static int smack_inode_alloc_security(struct inode *inode) | |
381 | { | |
86a264ab | 382 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
383 | if (inode->i_security == NULL) |
384 | return -ENOMEM; | |
385 | return 0; | |
386 | } | |
387 | ||
388 | /** | |
389 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 390 | * @inode: the inode with a blob |
e114e473 CS |
391 | * |
392 | * Clears the blob pointer in inode | |
393 | */ | |
394 | static void smack_inode_free_security(struct inode *inode) | |
395 | { | |
396 | kfree(inode->i_security); | |
397 | inode->i_security = NULL; | |
398 | } | |
399 | ||
400 | /** | |
401 | * smack_inode_init_security - copy out the smack from an inode | |
402 | * @inode: the inode | |
403 | * @dir: unused | |
404 | * @name: where to put the attribute name | |
405 | * @value: where to put the attribute value | |
406 | * @len: where to put the length of the attribute | |
407 | * | |
408 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
409 | */ | |
410 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
411 | char **name, void **value, size_t *len) | |
412 | { | |
413 | char *isp = smk_of_inode(inode); | |
414 | ||
415 | if (name) { | |
416 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
417 | if (*name == NULL) | |
418 | return -ENOMEM; | |
419 | } | |
420 | ||
421 | if (value) { | |
422 | *value = kstrdup(isp, GFP_KERNEL); | |
423 | if (*value == NULL) | |
424 | return -ENOMEM; | |
425 | } | |
426 | ||
427 | if (len) | |
428 | *len = strlen(isp) + 1; | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | /** | |
434 | * smack_inode_link - Smack check on link | |
435 | * @old_dentry: the existing object | |
436 | * @dir: unused | |
437 | * @new_dentry: the new object | |
438 | * | |
439 | * Returns 0 if access is permitted, an error code otherwise | |
440 | */ | |
441 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
442 | struct dentry *new_dentry) | |
443 | { | |
444 | int rc; | |
445 | char *isp; | |
446 | ||
447 | isp = smk_of_inode(old_dentry->d_inode); | |
448 | rc = smk_curacc(isp, MAY_WRITE); | |
449 | ||
450 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
451 | isp = smk_of_inode(new_dentry->d_inode); | |
452 | rc = smk_curacc(isp, MAY_WRITE); | |
453 | } | |
454 | ||
455 | return rc; | |
456 | } | |
457 | ||
458 | /** | |
459 | * smack_inode_unlink - Smack check on inode deletion | |
460 | * @dir: containing directory object | |
461 | * @dentry: file to unlink | |
462 | * | |
463 | * Returns 0 if current can write the containing directory | |
464 | * and the object, error code otherwise | |
465 | */ | |
466 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
467 | { | |
468 | struct inode *ip = dentry->d_inode; | |
469 | int rc; | |
470 | ||
471 | /* | |
472 | * You need write access to the thing you're unlinking | |
473 | */ | |
474 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE); | |
475 | if (rc == 0) | |
476 | /* | |
477 | * You also need write access to the containing directory | |
478 | */ | |
479 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
480 | ||
481 | return rc; | |
482 | } | |
483 | ||
484 | /** | |
485 | * smack_inode_rmdir - Smack check on directory deletion | |
486 | * @dir: containing directory object | |
487 | * @dentry: directory to unlink | |
488 | * | |
489 | * Returns 0 if current can write the containing directory | |
490 | * and the directory, error code otherwise | |
491 | */ | |
492 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
493 | { | |
494 | int rc; | |
495 | ||
496 | /* | |
497 | * You need write access to the thing you're removing | |
498 | */ | |
499 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
500 | if (rc == 0) | |
501 | /* | |
502 | * You also need write access to the containing directory | |
503 | */ | |
504 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
505 | ||
506 | return rc; | |
507 | } | |
508 | ||
509 | /** | |
510 | * smack_inode_rename - Smack check on rename | |
511 | * @old_inode: the old directory | |
512 | * @old_dentry: unused | |
513 | * @new_inode: the new directory | |
514 | * @new_dentry: unused | |
515 | * | |
516 | * Read and write access is required on both the old and | |
517 | * new directories. | |
518 | * | |
519 | * Returns 0 if access is permitted, an error code otherwise | |
520 | */ | |
521 | static int smack_inode_rename(struct inode *old_inode, | |
522 | struct dentry *old_dentry, | |
523 | struct inode *new_inode, | |
524 | struct dentry *new_dentry) | |
525 | { | |
526 | int rc; | |
527 | char *isp; | |
528 | ||
529 | isp = smk_of_inode(old_dentry->d_inode); | |
530 | rc = smk_curacc(isp, MAY_READWRITE); | |
531 | ||
532 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
533 | isp = smk_of_inode(new_dentry->d_inode); | |
534 | rc = smk_curacc(isp, MAY_READWRITE); | |
535 | } | |
536 | ||
537 | return rc; | |
538 | } | |
539 | ||
540 | /** | |
541 | * smack_inode_permission - Smack version of permission() | |
542 | * @inode: the inode in question | |
543 | * @mask: the access requested | |
e114e473 CS |
544 | * |
545 | * This is the important Smack hook. | |
546 | * | |
547 | * Returns 0 if access is permitted, -EACCES otherwise | |
548 | */ | |
b77b0646 | 549 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 CS |
550 | { |
551 | /* | |
552 | * No permission to check. Existence test. Yup, it's there. | |
553 | */ | |
554 | if (mask == 0) | |
555 | return 0; | |
556 | ||
557 | return smk_curacc(smk_of_inode(inode), mask); | |
558 | } | |
559 | ||
560 | /** | |
561 | * smack_inode_setattr - Smack check for setting attributes | |
562 | * @dentry: the object | |
563 | * @iattr: for the force flag | |
564 | * | |
565 | * Returns 0 if access is permitted, an error code otherwise | |
566 | */ | |
567 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
568 | { | |
569 | /* | |
570 | * Need to allow for clearing the setuid bit. | |
571 | */ | |
572 | if (iattr->ia_valid & ATTR_FORCE) | |
573 | return 0; | |
574 | ||
575 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
576 | } | |
577 | ||
578 | /** | |
579 | * smack_inode_getattr - Smack check for getting attributes | |
580 | * @mnt: unused | |
581 | * @dentry: the object | |
582 | * | |
583 | * Returns 0 if access is permitted, an error code otherwise | |
584 | */ | |
585 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
586 | { | |
587 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
588 | } | |
589 | ||
590 | /** | |
591 | * smack_inode_setxattr - Smack check for setting xattrs | |
592 | * @dentry: the object | |
593 | * @name: name of the attribute | |
594 | * @value: unused | |
595 | * @size: unused | |
596 | * @flags: unused | |
597 | * | |
598 | * This protects the Smack attribute explicitly. | |
599 | * | |
600 | * Returns 0 if access is permitted, an error code otherwise | |
601 | */ | |
8f0cfa52 DH |
602 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
603 | const void *value, size_t size, int flags) | |
e114e473 | 604 | { |
bcdca225 | 605 | int rc = 0; |
e114e473 | 606 | |
bcdca225 CS |
607 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
608 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
609 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
610 | if (!capable(CAP_MAC_ADMIN)) | |
611 | rc = -EPERM; | |
4303154e EB |
612 | /* a label cannot be void and cannot begin with '-' */ |
613 | if (size == 0 || (size > 0 && ((char *)value)[0] == '-')) | |
614 | rc = -EINVAL; | |
bcdca225 CS |
615 | } else |
616 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
617 | ||
618 | if (rc == 0) | |
619 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
620 | ||
621 | return rc; | |
e114e473 CS |
622 | } |
623 | ||
624 | /** | |
625 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
626 | * @dentry: object | |
627 | * @name: attribute name | |
628 | * @value: attribute value | |
629 | * @size: attribute size | |
630 | * @flags: unused | |
631 | * | |
632 | * Set the pointer in the inode blob to the entry found | |
633 | * in the master label list. | |
634 | */ | |
8f0cfa52 DH |
635 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
636 | const void *value, size_t size, int flags) | |
e114e473 CS |
637 | { |
638 | struct inode_smack *isp; | |
639 | char *nsp; | |
640 | ||
641 | /* | |
642 | * Not SMACK | |
643 | */ | |
644 | if (strcmp(name, XATTR_NAME_SMACK)) | |
645 | return; | |
646 | ||
647 | if (size >= SMK_LABELLEN) | |
648 | return; | |
649 | ||
650 | isp = dentry->d_inode->i_security; | |
651 | ||
652 | /* | |
653 | * No locking is done here. This is a pointer | |
654 | * assignment. | |
655 | */ | |
656 | nsp = smk_import(value, size); | |
657 | if (nsp != NULL) | |
658 | isp->smk_inode = nsp; | |
659 | else | |
660 | isp->smk_inode = smack_known_invalid.smk_known; | |
661 | ||
662 | return; | |
663 | } | |
664 | ||
665 | /* | |
666 | * smack_inode_getxattr - Smack check on getxattr | |
667 | * @dentry: the object | |
668 | * @name: unused | |
669 | * | |
670 | * Returns 0 if access is permitted, an error code otherwise | |
671 | */ | |
8f0cfa52 | 672 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 CS |
673 | { |
674 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
675 | } | |
676 | ||
677 | /* | |
678 | * smack_inode_removexattr - Smack check on removexattr | |
679 | * @dentry: the object | |
680 | * @name: name of the attribute | |
681 | * | |
682 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
683 | * | |
684 | * Returns 0 if access is permitted, an error code otherwise | |
685 | */ | |
8f0cfa52 | 686 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 687 | { |
bcdca225 | 688 | int rc = 0; |
e114e473 | 689 | |
bcdca225 CS |
690 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
691 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
692 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
693 | if (!capable(CAP_MAC_ADMIN)) | |
694 | rc = -EPERM; | |
695 | } else | |
696 | rc = cap_inode_removexattr(dentry, name); | |
697 | ||
698 | if (rc == 0) | |
699 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
700 | ||
701 | return rc; | |
e114e473 CS |
702 | } |
703 | ||
704 | /** | |
705 | * smack_inode_getsecurity - get smack xattrs | |
706 | * @inode: the object | |
707 | * @name: attribute name | |
708 | * @buffer: where to put the result | |
251a2a95 | 709 | * @alloc: unused |
e114e473 CS |
710 | * |
711 | * Returns the size of the attribute or an error code | |
712 | */ | |
713 | static int smack_inode_getsecurity(const struct inode *inode, | |
714 | const char *name, void **buffer, | |
715 | bool alloc) | |
716 | { | |
717 | struct socket_smack *ssp; | |
718 | struct socket *sock; | |
719 | struct super_block *sbp; | |
720 | struct inode *ip = (struct inode *)inode; | |
721 | char *isp; | |
722 | int ilen; | |
723 | int rc = 0; | |
724 | ||
725 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
726 | isp = smk_of_inode(inode); | |
727 | ilen = strlen(isp) + 1; | |
728 | *buffer = isp; | |
729 | return ilen; | |
730 | } | |
731 | ||
732 | /* | |
733 | * The rest of the Smack xattrs are only on sockets. | |
734 | */ | |
735 | sbp = ip->i_sb; | |
736 | if (sbp->s_magic != SOCKFS_MAGIC) | |
737 | return -EOPNOTSUPP; | |
738 | ||
739 | sock = SOCKET_I(ip); | |
2e1d146a | 740 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
741 | return -EOPNOTSUPP; |
742 | ||
743 | ssp = sock->sk->sk_security; | |
744 | ||
745 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
746 | isp = ssp->smk_in; | |
747 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
748 | isp = ssp->smk_out; | |
749 | else | |
750 | return -EOPNOTSUPP; | |
751 | ||
752 | ilen = strlen(isp) + 1; | |
753 | if (rc == 0) { | |
754 | *buffer = isp; | |
755 | rc = ilen; | |
756 | } | |
757 | ||
758 | return rc; | |
759 | } | |
760 | ||
761 | ||
762 | /** | |
763 | * smack_inode_listsecurity - list the Smack attributes | |
764 | * @inode: the object | |
765 | * @buffer: where they go | |
766 | * @buffer_size: size of buffer | |
767 | * | |
768 | * Returns 0 on success, -EINVAL otherwise | |
769 | */ | |
770 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
771 | size_t buffer_size) | |
772 | { | |
773 | int len = strlen(XATTR_NAME_SMACK); | |
774 | ||
775 | if (buffer != NULL && len <= buffer_size) { | |
776 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
777 | return len; | |
778 | } | |
779 | return -EINVAL; | |
780 | } | |
781 | ||
d20bdda6 AD |
782 | /** |
783 | * smack_inode_getsecid - Extract inode's security id | |
784 | * @inode: inode to extract the info from | |
785 | * @secid: where result will be saved | |
786 | */ | |
787 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
788 | { | |
789 | struct inode_smack *isp = inode->i_security; | |
790 | ||
791 | *secid = smack_to_secid(isp->smk_inode); | |
792 | } | |
793 | ||
e114e473 CS |
794 | /* |
795 | * File Hooks | |
796 | */ | |
797 | ||
798 | /** | |
799 | * smack_file_permission - Smack check on file operations | |
800 | * @file: unused | |
801 | * @mask: unused | |
802 | * | |
803 | * Returns 0 | |
804 | * | |
805 | * Should access checks be done on each read or write? | |
806 | * UNICOS and SELinux say yes. | |
807 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
808 | * | |
809 | * I'll say no for now. Smack does not do the frequent | |
810 | * label changing that SELinux does. | |
811 | */ | |
812 | static int smack_file_permission(struct file *file, int mask) | |
813 | { | |
814 | return 0; | |
815 | } | |
816 | ||
817 | /** | |
818 | * smack_file_alloc_security - assign a file security blob | |
819 | * @file: the object | |
820 | * | |
821 | * The security blob for a file is a pointer to the master | |
822 | * label list, so no allocation is done. | |
823 | * | |
824 | * Returns 0 | |
825 | */ | |
826 | static int smack_file_alloc_security(struct file *file) | |
827 | { | |
86a264ab | 828 | file->f_security = current_security(); |
e114e473 CS |
829 | return 0; |
830 | } | |
831 | ||
832 | /** | |
833 | * smack_file_free_security - clear a file security blob | |
834 | * @file: the object | |
835 | * | |
836 | * The security blob for a file is a pointer to the master | |
837 | * label list, so no memory is freed. | |
838 | */ | |
839 | static void smack_file_free_security(struct file *file) | |
840 | { | |
841 | file->f_security = NULL; | |
842 | } | |
843 | ||
844 | /** | |
845 | * smack_file_ioctl - Smack check on ioctls | |
846 | * @file: the object | |
847 | * @cmd: what to do | |
848 | * @arg: unused | |
849 | * | |
850 | * Relies heavily on the correct use of the ioctl command conventions. | |
851 | * | |
852 | * Returns 0 if allowed, error code otherwise | |
853 | */ | |
854 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
855 | unsigned long arg) | |
856 | { | |
857 | int rc = 0; | |
858 | ||
859 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
860 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
861 | ||
862 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
863 | rc = smk_curacc(file->f_security, MAY_READ); | |
864 | ||
865 | return rc; | |
866 | } | |
867 | ||
868 | /** | |
869 | * smack_file_lock - Smack check on file locking | |
870 | * @file: the object | |
251a2a95 | 871 | * @cmd: unused |
e114e473 CS |
872 | * |
873 | * Returns 0 if current has write access, error code otherwise | |
874 | */ | |
875 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
876 | { | |
877 | return smk_curacc(file->f_security, MAY_WRITE); | |
878 | } | |
879 | ||
880 | /** | |
881 | * smack_file_fcntl - Smack check on fcntl | |
882 | * @file: the object | |
883 | * @cmd: what action to check | |
884 | * @arg: unused | |
885 | * | |
886 | * Returns 0 if current has access, error code otherwise | |
887 | */ | |
888 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
889 | unsigned long arg) | |
890 | { | |
891 | int rc; | |
892 | ||
893 | switch (cmd) { | |
894 | case F_DUPFD: | |
895 | case F_GETFD: | |
896 | case F_GETFL: | |
897 | case F_GETLK: | |
898 | case F_GETOWN: | |
899 | case F_GETSIG: | |
900 | rc = smk_curacc(file->f_security, MAY_READ); | |
901 | break; | |
902 | case F_SETFD: | |
903 | case F_SETFL: | |
904 | case F_SETLK: | |
905 | case F_SETLKW: | |
906 | case F_SETOWN: | |
907 | case F_SETSIG: | |
908 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
909 | break; | |
910 | default: | |
911 | rc = smk_curacc(file->f_security, MAY_READWRITE); | |
912 | } | |
913 | ||
914 | return rc; | |
915 | } | |
916 | ||
917 | /** | |
918 | * smack_file_set_fowner - set the file security blob value | |
919 | * @file: object in question | |
920 | * | |
921 | * Returns 0 | |
922 | * Further research may be required on this one. | |
923 | */ | |
924 | static int smack_file_set_fowner(struct file *file) | |
925 | { | |
86a264ab | 926 | file->f_security = current_security(); |
e114e473 CS |
927 | return 0; |
928 | } | |
929 | ||
930 | /** | |
931 | * smack_file_send_sigiotask - Smack on sigio | |
932 | * @tsk: The target task | |
933 | * @fown: the object the signal come from | |
934 | * @signum: unused | |
935 | * | |
936 | * Allow a privileged task to get signals even if it shouldn't | |
937 | * | |
938 | * Returns 0 if a subject with the object's smack could | |
939 | * write to the task, an error code otherwise. | |
940 | */ | |
941 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
942 | struct fown_struct *fown, int signum) | |
943 | { | |
944 | struct file *file; | |
945 | int rc; | |
946 | ||
947 | /* | |
948 | * struct fown_struct is never outside the context of a struct file | |
949 | */ | |
950 | file = container_of(fown, struct file, f_owner); | |
b6dff3ec | 951 | rc = smk_access(file->f_security, tsk->cred->security, MAY_WRITE); |
5cd9c58f | 952 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
e114e473 CS |
953 | return 0; |
954 | return rc; | |
955 | } | |
956 | ||
957 | /** | |
958 | * smack_file_receive - Smack file receive check | |
959 | * @file: the object | |
960 | * | |
961 | * Returns 0 if current has access, error code otherwise | |
962 | */ | |
963 | static int smack_file_receive(struct file *file) | |
964 | { | |
965 | int may = 0; | |
966 | ||
967 | /* | |
968 | * This code relies on bitmasks. | |
969 | */ | |
970 | if (file->f_mode & FMODE_READ) | |
971 | may = MAY_READ; | |
972 | if (file->f_mode & FMODE_WRITE) | |
973 | may |= MAY_WRITE; | |
974 | ||
975 | return smk_curacc(file->f_security, may); | |
976 | } | |
977 | ||
978 | /* | |
979 | * Task hooks | |
980 | */ | |
981 | ||
e114e473 | 982 | /** |
f1752eec DH |
983 | * smack_cred_free - "free" task-level security credentials |
984 | * @cred: the credentials in question | |
e114e473 CS |
985 | * |
986 | * Smack isn't using copies of blobs. Everyone | |
987 | * points to an immutable list. The blobs never go away. | |
988 | * There is no leak here. | |
989 | */ | |
f1752eec | 990 | static void smack_cred_free(struct cred *cred) |
e114e473 | 991 | { |
f1752eec | 992 | cred->security = NULL; |
e114e473 CS |
993 | } |
994 | ||
d84f4f99 DH |
995 | /** |
996 | * smack_cred_prepare - prepare new set of credentials for modification | |
997 | * @new: the new credentials | |
998 | * @old: the original credentials | |
999 | * @gfp: the atomicity of any memory allocations | |
1000 | * | |
1001 | * Prepare a new set of credentials for modification. | |
1002 | */ | |
1003 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1004 | gfp_t gfp) | |
1005 | { | |
1006 | new->security = old->security; | |
1007 | return 0; | |
1008 | } | |
1009 | ||
251a2a95 RD |
1010 | /** |
1011 | * smack_cred_commit - commit new credentials | |
d84f4f99 DH |
1012 | * @new: the new credentials |
1013 | * @old: the original credentials | |
1014 | */ | |
1015 | static void smack_cred_commit(struct cred *new, const struct cred *old) | |
1016 | { | |
1017 | } | |
1018 | ||
3a3b7ce9 DH |
1019 | /** |
1020 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1021 | * @new: points to the set of credentials to be modified. |
1022 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1023 | * |
1024 | * Set the security data for a kernel service. | |
1025 | */ | |
1026 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1027 | { | |
1028 | char *smack = smack_from_secid(secid); | |
1029 | ||
1030 | if (smack == NULL) | |
1031 | return -EINVAL; | |
1032 | ||
1033 | new->security = smack; | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /** | |
1038 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1039 | * @new: points to the set of credentials to be modified |
1040 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1041 | * |
1042 | * Set the file creation context in a set of credentials to the same | |
1043 | * as the objective context of the specified inode | |
1044 | */ | |
1045 | static int smack_kernel_create_files_as(struct cred *new, | |
1046 | struct inode *inode) | |
1047 | { | |
1048 | struct inode_smack *isp = inode->i_security; | |
1049 | ||
1050 | new->security = isp->smk_inode; | |
1051 | return 0; | |
1052 | } | |
1053 | ||
e114e473 CS |
1054 | /** |
1055 | * smack_task_setpgid - Smack check on setting pgid | |
1056 | * @p: the task object | |
1057 | * @pgid: unused | |
1058 | * | |
1059 | * Return 0 if write access is permitted | |
1060 | */ | |
1061 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1062 | { | |
c69e8d9c | 1063 | return smk_curacc(task_security(p), MAY_WRITE); |
e114e473 CS |
1064 | } |
1065 | ||
1066 | /** | |
1067 | * smack_task_getpgid - Smack access check for getpgid | |
1068 | * @p: the object task | |
1069 | * | |
1070 | * Returns 0 if current can read the object task, error code otherwise | |
1071 | */ | |
1072 | static int smack_task_getpgid(struct task_struct *p) | |
1073 | { | |
c69e8d9c | 1074 | return smk_curacc(task_security(p), MAY_READ); |
e114e473 CS |
1075 | } |
1076 | ||
1077 | /** | |
1078 | * smack_task_getsid - Smack access check for getsid | |
1079 | * @p: the object task | |
1080 | * | |
1081 | * Returns 0 if current can read the object task, error code otherwise | |
1082 | */ | |
1083 | static int smack_task_getsid(struct task_struct *p) | |
1084 | { | |
c69e8d9c | 1085 | return smk_curacc(task_security(p), MAY_READ); |
e114e473 CS |
1086 | } |
1087 | ||
1088 | /** | |
1089 | * smack_task_getsecid - get the secid of the task | |
1090 | * @p: the object task | |
1091 | * @secid: where to put the result | |
1092 | * | |
1093 | * Sets the secid to contain a u32 version of the smack label. | |
1094 | */ | |
1095 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1096 | { | |
c69e8d9c | 1097 | *secid = smack_to_secid(task_security(p)); |
e114e473 CS |
1098 | } |
1099 | ||
1100 | /** | |
1101 | * smack_task_setnice - Smack check on setting nice | |
1102 | * @p: the task object | |
1103 | * @nice: unused | |
1104 | * | |
1105 | * Return 0 if write access is permitted | |
1106 | */ | |
1107 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1108 | { | |
bcdca225 CS |
1109 | int rc; |
1110 | ||
1111 | rc = cap_task_setnice(p, nice); | |
1112 | if (rc == 0) | |
c69e8d9c | 1113 | rc = smk_curacc(task_security(p), MAY_WRITE); |
bcdca225 | 1114 | return rc; |
e114e473 CS |
1115 | } |
1116 | ||
1117 | /** | |
1118 | * smack_task_setioprio - Smack check on setting ioprio | |
1119 | * @p: the task object | |
1120 | * @ioprio: unused | |
1121 | * | |
1122 | * Return 0 if write access is permitted | |
1123 | */ | |
1124 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1125 | { | |
bcdca225 CS |
1126 | int rc; |
1127 | ||
1128 | rc = cap_task_setioprio(p, ioprio); | |
1129 | if (rc == 0) | |
c69e8d9c | 1130 | rc = smk_curacc(task_security(p), MAY_WRITE); |
bcdca225 | 1131 | return rc; |
e114e473 CS |
1132 | } |
1133 | ||
1134 | /** | |
1135 | * smack_task_getioprio - Smack check on reading ioprio | |
1136 | * @p: the task object | |
1137 | * | |
1138 | * Return 0 if read access is permitted | |
1139 | */ | |
1140 | static int smack_task_getioprio(struct task_struct *p) | |
1141 | { | |
c69e8d9c | 1142 | return smk_curacc(task_security(p), MAY_READ); |
e114e473 CS |
1143 | } |
1144 | ||
1145 | /** | |
1146 | * smack_task_setscheduler - Smack check on setting scheduler | |
1147 | * @p: the task object | |
1148 | * @policy: unused | |
1149 | * @lp: unused | |
1150 | * | |
1151 | * Return 0 if read access is permitted | |
1152 | */ | |
1153 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1154 | struct sched_param *lp) | |
1155 | { | |
bcdca225 CS |
1156 | int rc; |
1157 | ||
1158 | rc = cap_task_setscheduler(p, policy, lp); | |
1159 | if (rc == 0) | |
c69e8d9c | 1160 | rc = smk_curacc(task_security(p), MAY_WRITE); |
bcdca225 | 1161 | return rc; |
e114e473 CS |
1162 | } |
1163 | ||
1164 | /** | |
1165 | * smack_task_getscheduler - Smack check on reading scheduler | |
1166 | * @p: the task object | |
1167 | * | |
1168 | * Return 0 if read access is permitted | |
1169 | */ | |
1170 | static int smack_task_getscheduler(struct task_struct *p) | |
1171 | { | |
c69e8d9c | 1172 | return smk_curacc(task_security(p), MAY_READ); |
e114e473 CS |
1173 | } |
1174 | ||
1175 | /** | |
1176 | * smack_task_movememory - Smack check on moving memory | |
1177 | * @p: the task object | |
1178 | * | |
1179 | * Return 0 if write access is permitted | |
1180 | */ | |
1181 | static int smack_task_movememory(struct task_struct *p) | |
1182 | { | |
c69e8d9c | 1183 | return smk_curacc(task_security(p), MAY_WRITE); |
e114e473 CS |
1184 | } |
1185 | ||
1186 | /** | |
1187 | * smack_task_kill - Smack check on signal delivery | |
1188 | * @p: the task object | |
1189 | * @info: unused | |
1190 | * @sig: unused | |
1191 | * @secid: identifies the smack to use in lieu of current's | |
1192 | * | |
1193 | * Return 0 if write access is permitted | |
1194 | * | |
1195 | * The secid behavior is an artifact of an SELinux hack | |
1196 | * in the USB code. Someday it may go away. | |
1197 | */ | |
1198 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1199 | int sig, u32 secid) | |
1200 | { | |
e114e473 CS |
1201 | /* |
1202 | * Sending a signal requires that the sender | |
1203 | * can write the receiver. | |
1204 | */ | |
1205 | if (secid == 0) | |
c69e8d9c | 1206 | return smk_curacc(task_security(p), MAY_WRITE); |
e114e473 CS |
1207 | /* |
1208 | * If the secid isn't 0 we're dealing with some USB IO | |
1209 | * specific behavior. This is not clean. For one thing | |
1210 | * we can't take privilege into account. | |
1211 | */ | |
c69e8d9c | 1212 | return smk_access(smack_from_secid(secid), task_security(p), MAY_WRITE); |
e114e473 CS |
1213 | } |
1214 | ||
1215 | /** | |
1216 | * smack_task_wait - Smack access check for waiting | |
1217 | * @p: task to wait for | |
1218 | * | |
1219 | * Returns 0 if current can wait for p, error code otherwise | |
1220 | */ | |
1221 | static int smack_task_wait(struct task_struct *p) | |
1222 | { | |
1223 | int rc; | |
1224 | ||
c69e8d9c | 1225 | rc = smk_access(current_security(), task_security(p), MAY_WRITE); |
e114e473 CS |
1226 | if (rc == 0) |
1227 | return 0; | |
1228 | ||
1229 | /* | |
1230 | * Allow the operation to succeed if either task | |
1231 | * has privilege to perform operations that might | |
1232 | * account for the smack labels having gotten to | |
1233 | * be different in the first place. | |
1234 | * | |
5cd9c58f | 1235 | * This breaks the strict subject/object access |
e114e473 CS |
1236 | * control ideal, taking the object's privilege |
1237 | * state into account in the decision as well as | |
1238 | * the smack value. | |
1239 | */ | |
5cd9c58f | 1240 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
e114e473 CS |
1241 | return 0; |
1242 | ||
1243 | return rc; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * smack_task_to_inode - copy task smack into the inode blob | |
1248 | * @p: task to copy from | |
251a2a95 | 1249 | * @inode: inode to copy to |
e114e473 CS |
1250 | * |
1251 | * Sets the smack pointer in the inode security blob | |
1252 | */ | |
1253 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1254 | { | |
1255 | struct inode_smack *isp = inode->i_security; | |
c69e8d9c | 1256 | isp->smk_inode = task_security(p); |
e114e473 CS |
1257 | } |
1258 | ||
1259 | /* | |
1260 | * Socket hooks. | |
1261 | */ | |
1262 | ||
1263 | /** | |
1264 | * smack_sk_alloc_security - Allocate a socket blob | |
1265 | * @sk: the socket | |
1266 | * @family: unused | |
251a2a95 | 1267 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1268 | * |
1269 | * Assign Smack pointers to current | |
1270 | * | |
1271 | * Returns 0 on success, -ENOMEM is there's no memory | |
1272 | */ | |
1273 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1274 | { | |
86a264ab | 1275 | char *csp = current_security(); |
e114e473 CS |
1276 | struct socket_smack *ssp; |
1277 | ||
1278 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1279 | if (ssp == NULL) | |
1280 | return -ENOMEM; | |
1281 | ||
1282 | ssp->smk_in = csp; | |
1283 | ssp->smk_out = csp; | |
1284 | ssp->smk_packet[0] = '\0'; | |
1285 | ||
1286 | sk->sk_security = ssp; | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * smack_sk_free_security - Free a socket blob | |
1293 | * @sk: the socket | |
1294 | * | |
1295 | * Clears the blob pointer | |
1296 | */ | |
1297 | static void smack_sk_free_security(struct sock *sk) | |
1298 | { | |
1299 | kfree(sk->sk_security); | |
1300 | } | |
1301 | ||
07feee8f PM |
1302 | /** |
1303 | * smack_host_label - check host based restrictions | |
1304 | * @sip: the object end | |
1305 | * | |
1306 | * looks for host based access restrictions | |
1307 | * | |
1308 | * This version will only be appropriate for really small sets of single label | |
1309 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1310 | * taken before calling this function. | |
1311 | * | |
1312 | * Returns the label of the far end or NULL if it's not special. | |
1313 | */ | |
1314 | static char *smack_host_label(struct sockaddr_in *sip) | |
1315 | { | |
1316 | struct smk_netlbladdr *snp; | |
1317 | struct in_addr *siap = &sip->sin_addr; | |
1318 | ||
1319 | if (siap->s_addr == 0) | |
1320 | return NULL; | |
1321 | ||
1322 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1323 | /* | |
1324 | * we break after finding the first match because | |
1325 | * the list is sorted from longest to shortest mask | |
1326 | * so we have found the most specific match | |
1327 | */ | |
1328 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1329 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1330 | /* we have found the special CIPSO option */ | |
1331 | if (snp->smk_label == smack_cipso_option) | |
1332 | return NULL; | |
07feee8f | 1333 | return snp->smk_label; |
4303154e | 1334 | } |
07feee8f PM |
1335 | |
1336 | return NULL; | |
1337 | } | |
1338 | ||
e114e473 CS |
1339 | /** |
1340 | * smack_set_catset - convert a capset to netlabel mls categories | |
1341 | * @catset: the Smack categories | |
1342 | * @sap: where to put the netlabel categories | |
1343 | * | |
1344 | * Allocates and fills attr.mls.cat | |
1345 | */ | |
1346 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1347 | { | |
1348 | unsigned char *cp; | |
1349 | unsigned char m; | |
1350 | int cat; | |
1351 | int rc; | |
1352 | int byte; | |
1353 | ||
c60264c4 | 1354 | if (!catset) |
e114e473 CS |
1355 | return; |
1356 | ||
1357 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1358 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1359 | sap->attr.mls.cat->startbit = 0; | |
1360 | ||
1361 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1362 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1363 | if ((m & *cp) == 0) | |
1364 | continue; | |
1365 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1366 | cat, GFP_ATOMIC); | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | /** | |
1371 | * smack_to_secattr - fill a secattr from a smack value | |
1372 | * @smack: the smack value | |
1373 | * @nlsp: where the result goes | |
1374 | * | |
1375 | * Casey says that CIPSO is good enough for now. | |
1376 | * It can be used to effect. | |
1377 | * It can also be abused to effect when necessary. | |
1378 | * Appologies to the TSIG group in general and GW in particular. | |
1379 | */ | |
1380 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1381 | { | |
1382 | struct smack_cipso cipso; | |
1383 | int rc; | |
1384 | ||
6d3dc07c CS |
1385 | nlsp->domain = smack; |
1386 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1387 | |
6d3dc07c CS |
1388 | rc = smack_to_cipso(smack, &cipso); |
1389 | if (rc == 0) { | |
1390 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1391 | smack_set_catset(cipso.smk_catset, nlsp); | |
1392 | } else { | |
1393 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1394 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1395 | } |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * smack_netlabel - Set the secattr on a socket | |
1400 | * @sk: the socket | |
6d3dc07c | 1401 | * @labeled: socket label scheme |
e114e473 CS |
1402 | * |
1403 | * Convert the outbound smack value (smk_out) to a | |
1404 | * secattr and attach it to the socket. | |
1405 | * | |
1406 | * Returns 0 on success or an error code | |
1407 | */ | |
6d3dc07c | 1408 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1409 | { |
07feee8f | 1410 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1411 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1412 | int rc = 0; |
e114e473 | 1413 | |
6d3dc07c CS |
1414 | /* |
1415 | * Usually the netlabel code will handle changing the | |
1416 | * packet labeling based on the label. | |
1417 | * The case of a single label host is different, because | |
1418 | * a single label host should never get a labeled packet | |
1419 | * even though the label is usually associated with a packet | |
1420 | * label. | |
1421 | */ | |
1422 | local_bh_disable(); | |
1423 | bh_lock_sock_nested(sk); | |
1424 | ||
1425 | if (ssp->smk_out == smack_net_ambient || | |
1426 | labeled == SMACK_UNLABELED_SOCKET) | |
1427 | netlbl_sock_delattr(sk); | |
1428 | else { | |
1429 | netlbl_secattr_init(&secattr); | |
1430 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1431 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1432 | netlbl_secattr_destroy(&secattr); |
1433 | } | |
1434 | ||
1435 | bh_unlock_sock(sk); | |
1436 | local_bh_enable(); | |
4bc87e62 | 1437 | |
e114e473 CS |
1438 | return rc; |
1439 | } | |
1440 | ||
07feee8f PM |
1441 | /** |
1442 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1443 | * @sk: the socket | |
1444 | * @sap: the destination address | |
1445 | * | |
1446 | * Set the correct secattr for the given socket based on the destination | |
1447 | * address and perform any outbound access checks needed. | |
1448 | * | |
1449 | * Returns 0 on success or an error code. | |
1450 | * | |
1451 | */ | |
1452 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1453 | { | |
1454 | int rc; | |
1455 | int sk_lbl; | |
1456 | char *hostsp; | |
1457 | struct socket_smack *ssp = sk->sk_security; | |
1458 | ||
1459 | rcu_read_lock(); | |
1460 | hostsp = smack_host_label(sap); | |
1461 | if (hostsp != NULL) { | |
1462 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
1463 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE); | |
1464 | } else { | |
1465 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1466 | rc = 0; | |
1467 | } | |
1468 | rcu_read_unlock(); | |
1469 | if (rc != 0) | |
1470 | return rc; | |
1471 | ||
1472 | return smack_netlabel(sk, sk_lbl); | |
1473 | } | |
1474 | ||
e114e473 CS |
1475 | /** |
1476 | * smack_inode_setsecurity - set smack xattrs | |
1477 | * @inode: the object | |
1478 | * @name: attribute name | |
1479 | * @value: attribute value | |
1480 | * @size: size of the attribute | |
1481 | * @flags: unused | |
1482 | * | |
1483 | * Sets the named attribute in the appropriate blob | |
1484 | * | |
1485 | * Returns 0 on success, or an error code | |
1486 | */ | |
1487 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1488 | const void *value, size_t size, int flags) | |
1489 | { | |
1490 | char *sp; | |
1491 | struct inode_smack *nsp = inode->i_security; | |
1492 | struct socket_smack *ssp; | |
1493 | struct socket *sock; | |
4bc87e62 | 1494 | int rc = 0; |
e114e473 | 1495 | |
4303154e | 1496 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1497 | return -EACCES; |
1498 | ||
1499 | sp = smk_import(value, size); | |
1500 | if (sp == NULL) | |
1501 | return -EINVAL; | |
1502 | ||
1503 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1504 | nsp->smk_inode = sp; | |
1505 | return 0; | |
1506 | } | |
1507 | /* | |
1508 | * The rest of the Smack xattrs are only on sockets. | |
1509 | */ | |
1510 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1511 | return -EOPNOTSUPP; | |
1512 | ||
1513 | sock = SOCKET_I(inode); | |
2e1d146a | 1514 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1515 | return -EOPNOTSUPP; |
1516 | ||
1517 | ssp = sock->sk->sk_security; | |
1518 | ||
1519 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1520 | ssp->smk_in = sp; | |
1521 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1522 | ssp->smk_out = sp; | |
6d3dc07c | 1523 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
4bc87e62 CS |
1524 | if (rc != 0) |
1525 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1526 | __func__, -rc); | |
e114e473 CS |
1527 | } else |
1528 | return -EOPNOTSUPP; | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | /** | |
1534 | * smack_socket_post_create - finish socket setup | |
1535 | * @sock: the socket | |
1536 | * @family: protocol family | |
1537 | * @type: unused | |
1538 | * @protocol: unused | |
1539 | * @kern: unused | |
1540 | * | |
1541 | * Sets the netlabel information on the socket | |
1542 | * | |
1543 | * Returns 0 on success, and error code otherwise | |
1544 | */ | |
1545 | static int smack_socket_post_create(struct socket *sock, int family, | |
1546 | int type, int protocol, int kern) | |
1547 | { | |
2e1d146a | 1548 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1549 | return 0; |
1550 | /* | |
1551 | * Set the outbound netlbl. | |
1552 | */ | |
6d3dc07c CS |
1553 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1554 | } | |
1555 | ||
6d3dc07c CS |
1556 | /** |
1557 | * smack_socket_connect - connect access check | |
1558 | * @sock: the socket | |
1559 | * @sap: the other end | |
1560 | * @addrlen: size of sap | |
1561 | * | |
1562 | * Verifies that a connection may be possible | |
1563 | * | |
1564 | * Returns 0 on success, and error code otherwise | |
1565 | */ | |
1566 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1567 | int addrlen) | |
1568 | { | |
6d3dc07c CS |
1569 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1570 | return 0; | |
6d3dc07c CS |
1571 | if (addrlen < sizeof(struct sockaddr_in)) |
1572 | return -EINVAL; | |
1573 | ||
07feee8f | 1574 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1575 | } |
1576 | ||
1577 | /** | |
1578 | * smack_flags_to_may - convert S_ to MAY_ values | |
1579 | * @flags: the S_ value | |
1580 | * | |
1581 | * Returns the equivalent MAY_ value | |
1582 | */ | |
1583 | static int smack_flags_to_may(int flags) | |
1584 | { | |
1585 | int may = 0; | |
1586 | ||
1587 | if (flags & S_IRUGO) | |
1588 | may |= MAY_READ; | |
1589 | if (flags & S_IWUGO) | |
1590 | may |= MAY_WRITE; | |
1591 | if (flags & S_IXUGO) | |
1592 | may |= MAY_EXEC; | |
1593 | ||
1594 | return may; | |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1599 | * @msg: the object | |
1600 | * | |
1601 | * Returns 0 | |
1602 | */ | |
1603 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1604 | { | |
86a264ab | 1605 | msg->security = current_security(); |
e114e473 CS |
1606 | return 0; |
1607 | } | |
1608 | ||
1609 | /** | |
1610 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1611 | * @msg: the object | |
1612 | * | |
1613 | * Clears the blob pointer | |
1614 | */ | |
1615 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1616 | { | |
1617 | msg->security = NULL; | |
1618 | } | |
1619 | ||
1620 | /** | |
1621 | * smack_of_shm - the smack pointer for the shm | |
1622 | * @shp: the object | |
1623 | * | |
1624 | * Returns a pointer to the smack value | |
1625 | */ | |
1626 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1627 | { | |
1628 | return (char *)shp->shm_perm.security; | |
1629 | } | |
1630 | ||
1631 | /** | |
1632 | * smack_shm_alloc_security - Set the security blob for shm | |
1633 | * @shp: the object | |
1634 | * | |
1635 | * Returns 0 | |
1636 | */ | |
1637 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1638 | { | |
1639 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1640 | ||
86a264ab | 1641 | isp->security = current_security(); |
e114e473 CS |
1642 | return 0; |
1643 | } | |
1644 | ||
1645 | /** | |
1646 | * smack_shm_free_security - Clear the security blob for shm | |
1647 | * @shp: the object | |
1648 | * | |
1649 | * Clears the blob pointer | |
1650 | */ | |
1651 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1652 | { | |
1653 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1654 | ||
1655 | isp->security = NULL; | |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * smack_shm_associate - Smack access check for shm | |
1660 | * @shp: the object | |
1661 | * @shmflg: access requested | |
1662 | * | |
1663 | * Returns 0 if current has the requested access, error code otherwise | |
1664 | */ | |
1665 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1666 | { | |
1667 | char *ssp = smack_of_shm(shp); | |
1668 | int may; | |
1669 | ||
1670 | may = smack_flags_to_may(shmflg); | |
1671 | return smk_curacc(ssp, may); | |
1672 | } | |
1673 | ||
1674 | /** | |
1675 | * smack_shm_shmctl - Smack access check for shm | |
1676 | * @shp: the object | |
1677 | * @cmd: what it wants to do | |
1678 | * | |
1679 | * Returns 0 if current has the requested access, error code otherwise | |
1680 | */ | |
1681 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1682 | { | |
1d252fb8 | 1683 | char *ssp; |
e114e473 CS |
1684 | int may; |
1685 | ||
1686 | switch (cmd) { | |
1687 | case IPC_STAT: | |
1688 | case SHM_STAT: | |
1689 | may = MAY_READ; | |
1690 | break; | |
1691 | case IPC_SET: | |
1692 | case SHM_LOCK: | |
1693 | case SHM_UNLOCK: | |
1694 | case IPC_RMID: | |
1695 | may = MAY_READWRITE; | |
1696 | break; | |
1697 | case IPC_INFO: | |
1698 | case SHM_INFO: | |
1699 | /* | |
1700 | * System level information. | |
1701 | */ | |
1702 | return 0; | |
1703 | default: | |
1704 | return -EINVAL; | |
1705 | } | |
1706 | ||
1d252fb8 | 1707 | ssp = smack_of_shm(shp); |
e114e473 CS |
1708 | return smk_curacc(ssp, may); |
1709 | } | |
1710 | ||
1711 | /** | |
1712 | * smack_shm_shmat - Smack access for shmat | |
1713 | * @shp: the object | |
1714 | * @shmaddr: unused | |
1715 | * @shmflg: access requested | |
1716 | * | |
1717 | * Returns 0 if current has the requested access, error code otherwise | |
1718 | */ | |
1719 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1720 | int shmflg) | |
1721 | { | |
1722 | char *ssp = smack_of_shm(shp); | |
1723 | int may; | |
1724 | ||
1725 | may = smack_flags_to_may(shmflg); | |
1726 | return smk_curacc(ssp, may); | |
1727 | } | |
1728 | ||
1729 | /** | |
1730 | * smack_of_sem - the smack pointer for the sem | |
1731 | * @sma: the object | |
1732 | * | |
1733 | * Returns a pointer to the smack value | |
1734 | */ | |
1735 | static char *smack_of_sem(struct sem_array *sma) | |
1736 | { | |
1737 | return (char *)sma->sem_perm.security; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * smack_sem_alloc_security - Set the security blob for sem | |
1742 | * @sma: the object | |
1743 | * | |
1744 | * Returns 0 | |
1745 | */ | |
1746 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1747 | { | |
1748 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1749 | ||
86a264ab | 1750 | isp->security = current_security(); |
e114e473 CS |
1751 | return 0; |
1752 | } | |
1753 | ||
1754 | /** | |
1755 | * smack_sem_free_security - Clear the security blob for sem | |
1756 | * @sma: the object | |
1757 | * | |
1758 | * Clears the blob pointer | |
1759 | */ | |
1760 | static void smack_sem_free_security(struct sem_array *sma) | |
1761 | { | |
1762 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1763 | ||
1764 | isp->security = NULL; | |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * smack_sem_associate - Smack access check for sem | |
1769 | * @sma: the object | |
1770 | * @semflg: access requested | |
1771 | * | |
1772 | * Returns 0 if current has the requested access, error code otherwise | |
1773 | */ | |
1774 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1775 | { | |
1776 | char *ssp = smack_of_sem(sma); | |
1777 | int may; | |
1778 | ||
1779 | may = smack_flags_to_may(semflg); | |
1780 | return smk_curacc(ssp, may); | |
1781 | } | |
1782 | ||
1783 | /** | |
1784 | * smack_sem_shmctl - Smack access check for sem | |
1785 | * @sma: the object | |
1786 | * @cmd: what it wants to do | |
1787 | * | |
1788 | * Returns 0 if current has the requested access, error code otherwise | |
1789 | */ | |
1790 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1791 | { | |
1d252fb8 | 1792 | char *ssp; |
e114e473 CS |
1793 | int may; |
1794 | ||
1795 | switch (cmd) { | |
1796 | case GETPID: | |
1797 | case GETNCNT: | |
1798 | case GETZCNT: | |
1799 | case GETVAL: | |
1800 | case GETALL: | |
1801 | case IPC_STAT: | |
1802 | case SEM_STAT: | |
1803 | may = MAY_READ; | |
1804 | break; | |
1805 | case SETVAL: | |
1806 | case SETALL: | |
1807 | case IPC_RMID: | |
1808 | case IPC_SET: | |
1809 | may = MAY_READWRITE; | |
1810 | break; | |
1811 | case IPC_INFO: | |
1812 | case SEM_INFO: | |
1813 | /* | |
1814 | * System level information | |
1815 | */ | |
1816 | return 0; | |
1817 | default: | |
1818 | return -EINVAL; | |
1819 | } | |
1820 | ||
1d252fb8 | 1821 | ssp = smack_of_sem(sma); |
e114e473 CS |
1822 | return smk_curacc(ssp, may); |
1823 | } | |
1824 | ||
1825 | /** | |
1826 | * smack_sem_semop - Smack checks of semaphore operations | |
1827 | * @sma: the object | |
1828 | * @sops: unused | |
1829 | * @nsops: unused | |
1830 | * @alter: unused | |
1831 | * | |
1832 | * Treated as read and write in all cases. | |
1833 | * | |
1834 | * Returns 0 if access is allowed, error code otherwise | |
1835 | */ | |
1836 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
1837 | unsigned nsops, int alter) | |
1838 | { | |
1839 | char *ssp = smack_of_sem(sma); | |
1840 | ||
1841 | return smk_curacc(ssp, MAY_READWRITE); | |
1842 | } | |
1843 | ||
1844 | /** | |
1845 | * smack_msg_alloc_security - Set the security blob for msg | |
1846 | * @msq: the object | |
1847 | * | |
1848 | * Returns 0 | |
1849 | */ | |
1850 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
1851 | { | |
1852 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1853 | ||
86a264ab | 1854 | kisp->security = current_security(); |
e114e473 CS |
1855 | return 0; |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * smack_msg_free_security - Clear the security blob for msg | |
1860 | * @msq: the object | |
1861 | * | |
1862 | * Clears the blob pointer | |
1863 | */ | |
1864 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
1865 | { | |
1866 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1867 | ||
1868 | kisp->security = NULL; | |
1869 | } | |
1870 | ||
1871 | /** | |
1872 | * smack_of_msq - the smack pointer for the msq | |
1873 | * @msq: the object | |
1874 | * | |
1875 | * Returns a pointer to the smack value | |
1876 | */ | |
1877 | static char *smack_of_msq(struct msg_queue *msq) | |
1878 | { | |
1879 | return (char *)msq->q_perm.security; | |
1880 | } | |
1881 | ||
1882 | /** | |
1883 | * smack_msg_queue_associate - Smack access check for msg_queue | |
1884 | * @msq: the object | |
1885 | * @msqflg: access requested | |
1886 | * | |
1887 | * Returns 0 if current has the requested access, error code otherwise | |
1888 | */ | |
1889 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
1890 | { | |
1891 | char *msp = smack_of_msq(msq); | |
1892 | int may; | |
1893 | ||
1894 | may = smack_flags_to_may(msqflg); | |
1895 | return smk_curacc(msp, may); | |
1896 | } | |
1897 | ||
1898 | /** | |
1899 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
1900 | * @msq: the object | |
1901 | * @cmd: what it wants to do | |
1902 | * | |
1903 | * Returns 0 if current has the requested access, error code otherwise | |
1904 | */ | |
1905 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
1906 | { | |
1d252fb8 | 1907 | char *msp; |
e114e473 CS |
1908 | int may; |
1909 | ||
1910 | switch (cmd) { | |
1911 | case IPC_STAT: | |
1912 | case MSG_STAT: | |
1913 | may = MAY_READ; | |
1914 | break; | |
1915 | case IPC_SET: | |
1916 | case IPC_RMID: | |
1917 | may = MAY_READWRITE; | |
1918 | break; | |
1919 | case IPC_INFO: | |
1920 | case MSG_INFO: | |
1921 | /* | |
1922 | * System level information | |
1923 | */ | |
1924 | return 0; | |
1925 | default: | |
1926 | return -EINVAL; | |
1927 | } | |
1928 | ||
1d252fb8 | 1929 | msp = smack_of_msq(msq); |
e114e473 CS |
1930 | return smk_curacc(msp, may); |
1931 | } | |
1932 | ||
1933 | /** | |
1934 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1935 | * @msq: the object | |
1936 | * @msg: unused | |
1937 | * @msqflg: access requested | |
1938 | * | |
1939 | * Returns 0 if current has the requested access, error code otherwise | |
1940 | */ | |
1941 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
1942 | int msqflg) | |
1943 | { | |
1944 | char *msp = smack_of_msq(msq); | |
1945 | int rc; | |
1946 | ||
1947 | rc = smack_flags_to_may(msqflg); | |
1948 | return smk_curacc(msp, rc); | |
1949 | } | |
1950 | ||
1951 | /** | |
1952 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1953 | * @msq: the object | |
1954 | * @msg: unused | |
1955 | * @target: unused | |
1956 | * @type: unused | |
1957 | * @mode: unused | |
1958 | * | |
1959 | * Returns 0 if current has read and write access, error code otherwise | |
1960 | */ | |
1961 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
1962 | struct task_struct *target, long type, int mode) | |
1963 | { | |
1964 | char *msp = smack_of_msq(msq); | |
1965 | ||
1966 | return smk_curacc(msp, MAY_READWRITE); | |
1967 | } | |
1968 | ||
1969 | /** | |
1970 | * smack_ipc_permission - Smack access for ipc_permission() | |
1971 | * @ipp: the object permissions | |
1972 | * @flag: access requested | |
1973 | * | |
1974 | * Returns 0 if current has read and write access, error code otherwise | |
1975 | */ | |
1976 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
1977 | { | |
1978 | char *isp = ipp->security; | |
1979 | int may; | |
1980 | ||
1981 | may = smack_flags_to_may(flag); | |
1982 | return smk_curacc(isp, may); | |
1983 | } | |
1984 | ||
d20bdda6 AD |
1985 | /** |
1986 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 1987 | * @ipp: the object permissions |
d20bdda6 AD |
1988 | * @secid: where result will be saved |
1989 | */ | |
1990 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
1991 | { | |
1992 | char *smack = ipp->security; | |
1993 | ||
1994 | *secid = smack_to_secid(smack); | |
1995 | } | |
1996 | ||
e114e473 CS |
1997 | /** |
1998 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
1999 | * @opt_dentry: unused | |
2000 | * @inode: the object | |
2001 | * | |
2002 | * Set the inode's security blob if it hasn't been done already. | |
2003 | */ | |
2004 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2005 | { | |
2006 | struct super_block *sbp; | |
2007 | struct superblock_smack *sbsp; | |
2008 | struct inode_smack *isp; | |
86a264ab | 2009 | char *csp = current_security(); |
e114e473 CS |
2010 | char *fetched; |
2011 | char *final; | |
2012 | struct dentry *dp; | |
2013 | ||
2014 | if (inode == NULL) | |
2015 | return; | |
2016 | ||
2017 | isp = inode->i_security; | |
2018 | ||
2019 | mutex_lock(&isp->smk_lock); | |
2020 | /* | |
2021 | * If the inode is already instantiated | |
2022 | * take the quick way out | |
2023 | */ | |
2024 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2025 | goto unlockandout; | |
2026 | ||
2027 | sbp = inode->i_sb; | |
2028 | sbsp = sbp->s_security; | |
2029 | /* | |
2030 | * We're going to use the superblock default label | |
2031 | * if there's no label on the file. | |
2032 | */ | |
2033 | final = sbsp->smk_default; | |
2034 | ||
e97dcb0e CS |
2035 | /* |
2036 | * If this is the root inode the superblock | |
2037 | * may be in the process of initialization. | |
2038 | * If that is the case use the root value out | |
2039 | * of the superblock. | |
2040 | */ | |
2041 | if (opt_dentry->d_parent == opt_dentry) { | |
2042 | isp->smk_inode = sbsp->smk_root; | |
2043 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2044 | goto unlockandout; | |
2045 | } | |
2046 | ||
e114e473 CS |
2047 | /* |
2048 | * This is pretty hackish. | |
2049 | * Casey says that we shouldn't have to do | |
2050 | * file system specific code, but it does help | |
2051 | * with keeping it simple. | |
2052 | */ | |
2053 | switch (sbp->s_magic) { | |
2054 | case SMACK_MAGIC: | |
2055 | /* | |
2056 | * Casey says that it's a little embarassing | |
2057 | * that the smack file system doesn't do | |
2058 | * extended attributes. | |
2059 | */ | |
2060 | final = smack_known_star.smk_known; | |
2061 | break; | |
2062 | case PIPEFS_MAGIC: | |
2063 | /* | |
2064 | * Casey says pipes are easy (?) | |
2065 | */ | |
2066 | final = smack_known_star.smk_known; | |
2067 | break; | |
2068 | case DEVPTS_SUPER_MAGIC: | |
2069 | /* | |
2070 | * devpts seems content with the label of the task. | |
2071 | * Programs that change smack have to treat the | |
2072 | * pty with respect. | |
2073 | */ | |
2074 | final = csp; | |
2075 | break; | |
2076 | case SOCKFS_MAGIC: | |
2077 | /* | |
2078 | * Casey says sockets get the smack of the task. | |
2079 | */ | |
2080 | final = csp; | |
2081 | break; | |
2082 | case PROC_SUPER_MAGIC: | |
2083 | /* | |
2084 | * Casey says procfs appears not to care. | |
2085 | * The superblock default suffices. | |
2086 | */ | |
2087 | break; | |
2088 | case TMPFS_MAGIC: | |
2089 | /* | |
2090 | * Device labels should come from the filesystem, | |
2091 | * but watch out, because they're volitile, | |
2092 | * getting recreated on every reboot. | |
2093 | */ | |
2094 | final = smack_known_star.smk_known; | |
2095 | /* | |
2096 | * No break. | |
2097 | * | |
2098 | * If a smack value has been set we want to use it, | |
2099 | * but since tmpfs isn't giving us the opportunity | |
2100 | * to set mount options simulate setting the | |
2101 | * superblock default. | |
2102 | */ | |
2103 | default: | |
2104 | /* | |
2105 | * This isn't an understood special case. | |
2106 | * Get the value from the xattr. | |
2107 | * | |
2108 | * No xattr support means, alas, no SMACK label. | |
2109 | * Use the aforeapplied default. | |
2110 | * It would be curious if the label of the task | |
2111 | * does not match that assigned. | |
2112 | */ | |
2113 | if (inode->i_op->getxattr == NULL) | |
2114 | break; | |
2115 | /* | |
2116 | * Get the dentry for xattr. | |
2117 | */ | |
2118 | if (opt_dentry == NULL) { | |
2119 | dp = d_find_alias(inode); | |
2120 | if (dp == NULL) | |
2121 | break; | |
2122 | } else { | |
2123 | dp = dget(opt_dentry); | |
2124 | if (dp == NULL) | |
2125 | break; | |
2126 | } | |
2127 | ||
2128 | fetched = smk_fetch(inode, dp); | |
2129 | if (fetched != NULL) | |
2130 | final = fetched; | |
2131 | ||
2132 | dput(dp); | |
2133 | break; | |
2134 | } | |
2135 | ||
2136 | if (final == NULL) | |
2137 | isp->smk_inode = csp; | |
2138 | else | |
2139 | isp->smk_inode = final; | |
2140 | ||
2141 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2142 | ||
2143 | unlockandout: | |
2144 | mutex_unlock(&isp->smk_lock); | |
2145 | return; | |
2146 | } | |
2147 | ||
2148 | /** | |
2149 | * smack_getprocattr - Smack process attribute access | |
2150 | * @p: the object task | |
2151 | * @name: the name of the attribute in /proc/.../attr | |
2152 | * @value: where to put the result | |
2153 | * | |
2154 | * Places a copy of the task Smack into value | |
2155 | * | |
2156 | * Returns the length of the smack label or an error code | |
2157 | */ | |
2158 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2159 | { | |
2160 | char *cp; | |
2161 | int slen; | |
2162 | ||
2163 | if (strcmp(name, "current") != 0) | |
2164 | return -EINVAL; | |
2165 | ||
c69e8d9c | 2166 | cp = kstrdup(task_security(p), GFP_KERNEL); |
e114e473 CS |
2167 | if (cp == NULL) |
2168 | return -ENOMEM; | |
2169 | ||
2170 | slen = strlen(cp); | |
2171 | *value = cp; | |
2172 | return slen; | |
2173 | } | |
2174 | ||
2175 | /** | |
2176 | * smack_setprocattr - Smack process attribute setting | |
2177 | * @p: the object task | |
2178 | * @name: the name of the attribute in /proc/.../attr | |
2179 | * @value: the value to set | |
2180 | * @size: the size of the value | |
2181 | * | |
2182 | * Sets the Smack value of the task. Only setting self | |
2183 | * is permitted and only with privilege | |
2184 | * | |
2185 | * Returns the length of the smack label or an error code | |
2186 | */ | |
2187 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2188 | void *value, size_t size) | |
2189 | { | |
d84f4f99 | 2190 | struct cred *new; |
e114e473 CS |
2191 | char *newsmack; |
2192 | ||
e114e473 CS |
2193 | /* |
2194 | * Changing another process' Smack value is too dangerous | |
2195 | * and supports no sane use case. | |
2196 | */ | |
2197 | if (p != current) | |
2198 | return -EPERM; | |
2199 | ||
5cd9c58f DH |
2200 | if (!capable(CAP_MAC_ADMIN)) |
2201 | return -EPERM; | |
2202 | ||
e114e473 CS |
2203 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2204 | return -EINVAL; | |
2205 | ||
2206 | if (strcmp(name, "current") != 0) | |
2207 | return -EINVAL; | |
2208 | ||
2209 | newsmack = smk_import(value, size); | |
2210 | if (newsmack == NULL) | |
2211 | return -EINVAL; | |
2212 | ||
6d3dc07c CS |
2213 | /* |
2214 | * No process is ever allowed the web ("@") label. | |
2215 | */ | |
2216 | if (newsmack == smack_known_web.smk_known) | |
2217 | return -EPERM; | |
2218 | ||
d84f4f99 | 2219 | new = prepare_creds(); |
6d3dc07c | 2220 | if (new == NULL) |
d84f4f99 DH |
2221 | return -ENOMEM; |
2222 | new->security = newsmack; | |
2223 | commit_creds(new); | |
e114e473 CS |
2224 | return size; |
2225 | } | |
2226 | ||
2227 | /** | |
2228 | * smack_unix_stream_connect - Smack access on UDS | |
2229 | * @sock: one socket | |
2230 | * @other: the other socket | |
2231 | * @newsk: unused | |
2232 | * | |
2233 | * Return 0 if a subject with the smack of sock could access | |
2234 | * an object with the smack of other, otherwise an error code | |
2235 | */ | |
2236 | static int smack_unix_stream_connect(struct socket *sock, | |
2237 | struct socket *other, struct sock *newsk) | |
2238 | { | |
2239 | struct inode *sp = SOCK_INODE(sock); | |
2240 | struct inode *op = SOCK_INODE(other); | |
2241 | ||
2242 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE); | |
2243 | } | |
2244 | ||
2245 | /** | |
2246 | * smack_unix_may_send - Smack access on UDS | |
2247 | * @sock: one socket | |
2248 | * @other: the other socket | |
2249 | * | |
2250 | * Return 0 if a subject with the smack of sock could access | |
2251 | * an object with the smack of other, otherwise an error code | |
2252 | */ | |
2253 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2254 | { | |
2255 | struct inode *sp = SOCK_INODE(sock); | |
2256 | struct inode *op = SOCK_INODE(other); | |
2257 | ||
2258 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE); | |
2259 | } | |
2260 | ||
6d3dc07c CS |
2261 | /** |
2262 | * smack_socket_sendmsg - Smack check based on destination host | |
2263 | * @sock: the socket | |
251a2a95 | 2264 | * @msg: the message |
6d3dc07c CS |
2265 | * @size: the size of the message |
2266 | * | |
2267 | * Return 0 if the current subject can write to the destination | |
2268 | * host. This is only a question if the destination is a single | |
2269 | * label host. | |
2270 | */ | |
2271 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2272 | int size) | |
2273 | { | |
2274 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2275 | |
2276 | /* | |
2277 | * Perfectly reasonable for this to be NULL | |
2278 | */ | |
2279 | if (sip == NULL || sip->sin_family != PF_INET) | |
2280 | return 0; | |
2281 | ||
07feee8f | 2282 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2283 | } |
2284 | ||
2285 | ||
e114e473 | 2286 | /** |
251a2a95 | 2287 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2288 | * @sap: netlabel secattr |
2289 | * @sip: where to put the result | |
2290 | * | |
2291 | * Copies a smack label into sip | |
2292 | */ | |
2293 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2294 | { | |
2295 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2296 | char *sp; |
e114e473 CS |
2297 | int pcat; |
2298 | ||
6d3dc07c | 2299 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2300 | /* |
6d3dc07c | 2301 | * Looks like a CIPSO packet. |
e114e473 CS |
2302 | * If there are flags but no level netlabel isn't |
2303 | * behaving the way we expect it to. | |
2304 | * | |
6d3dc07c | 2305 | * Get the categories, if any |
e114e473 CS |
2306 | * Without guidance regarding the smack value |
2307 | * for the packet fall back on the network | |
2308 | * ambient value. | |
2309 | */ | |
6d3dc07c CS |
2310 | memset(smack, '\0', SMK_LABELLEN); |
2311 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2312 | for (pcat = -1;;) { | |
2313 | pcat = netlbl_secattr_catmap_walk( | |
2314 | sap->attr.mls.cat, pcat + 1); | |
2315 | if (pcat < 0) | |
2316 | break; | |
2317 | smack_catset_bit(pcat, smack); | |
2318 | } | |
2319 | /* | |
2320 | * If it is CIPSO using smack direct mapping | |
2321 | * we are already done. WeeHee. | |
2322 | */ | |
2323 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2324 | memcpy(sip, smack, SMK_MAXLEN); | |
2325 | return; | |
2326 | } | |
2327 | /* | |
2328 | * Look it up in the supplied table if it is not | |
2329 | * a direct mapping. | |
2330 | */ | |
2331 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2332 | return; |
2333 | } | |
6d3dc07c CS |
2334 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2335 | /* | |
2336 | * Looks like a fallback, which gives us a secid. | |
2337 | */ | |
2338 | sp = smack_from_secid(sap->attr.secid); | |
2339 | /* | |
2340 | * This has got to be a bug because it is | |
2341 | * impossible to specify a fallback without | |
2342 | * specifying the label, which will ensure | |
2343 | * it has a secid, and the only way to get a | |
2344 | * secid is from a fallback. | |
2345 | */ | |
2346 | BUG_ON(sp == NULL); | |
2347 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2348 | return; |
2349 | } | |
2350 | /* | |
6d3dc07c CS |
2351 | * Without guidance regarding the smack value |
2352 | * for the packet fall back on the network | |
2353 | * ambient value. | |
e114e473 | 2354 | */ |
6d3dc07c | 2355 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2356 | return; |
2357 | } | |
2358 | ||
2359 | /** | |
2360 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2361 | * @sk: socket | |
2362 | * @skb: packet | |
2363 | * | |
2364 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2365 | */ | |
2366 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2367 | { | |
2368 | struct netlbl_lsm_secattr secattr; | |
2369 | struct socket_smack *ssp = sk->sk_security; | |
2370 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2371 | char *csp; |
e114e473 CS |
2372 | int rc; |
2373 | ||
2374 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2375 | return 0; | |
2376 | ||
2377 | /* | |
2378 | * Translate what netlabel gave us. | |
2379 | */ | |
e114e473 | 2380 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2381 | |
e114e473 | 2382 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2383 | if (rc == 0) { |
e114e473 | 2384 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2385 | csp = smack; |
2386 | } else | |
2387 | csp = smack_net_ambient; | |
2388 | ||
e114e473 | 2389 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2390 | |
e114e473 CS |
2391 | /* |
2392 | * Receiving a packet requires that the other end | |
2393 | * be able to write here. Read access is not required. | |
2394 | * This is the simplist possible security model | |
2395 | * for networking. | |
2396 | */ | |
6d3dc07c | 2397 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE); |
a8134296 PM |
2398 | if (rc != 0) |
2399 | netlbl_skbuff_err(skb, rc, 0); | |
2400 | return rc; | |
e114e473 CS |
2401 | } |
2402 | ||
2403 | /** | |
2404 | * smack_socket_getpeersec_stream - pull in packet label | |
2405 | * @sock: the socket | |
2406 | * @optval: user's destination | |
2407 | * @optlen: size thereof | |
251a2a95 | 2408 | * @len: max thereof |
e114e473 CS |
2409 | * |
2410 | * returns zero on success, an error code otherwise | |
2411 | */ | |
2412 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2413 | char __user *optval, | |
2414 | int __user *optlen, unsigned len) | |
2415 | { | |
2416 | struct socket_smack *ssp; | |
2417 | int slen; | |
2418 | int rc = 0; | |
2419 | ||
2420 | ssp = sock->sk->sk_security; | |
2421 | slen = strlen(ssp->smk_packet) + 1; | |
2422 | ||
2423 | if (slen > len) | |
2424 | rc = -ERANGE; | |
2425 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2426 | rc = -EFAULT; | |
2427 | ||
2428 | if (put_user(slen, optlen) != 0) | |
2429 | rc = -EFAULT; | |
2430 | ||
2431 | return rc; | |
2432 | } | |
2433 | ||
2434 | ||
2435 | /** | |
2436 | * smack_socket_getpeersec_dgram - pull in packet label | |
2437 | * @sock: the socket | |
2438 | * @skb: packet data | |
2439 | * @secid: pointer to where to put the secid of the packet | |
2440 | * | |
2441 | * Sets the netlabel socket state on sk from parent | |
2442 | */ | |
2443 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2444 | struct sk_buff *skb, u32 *secid) | |
2445 | ||
2446 | { | |
2447 | struct netlbl_lsm_secattr secattr; | |
2448 | struct sock *sk; | |
2449 | char smack[SMK_LABELLEN]; | |
2450 | int family = PF_INET; | |
2451 | u32 s; | |
2452 | int rc; | |
2453 | ||
2454 | /* | |
2455 | * Only works for families with packets. | |
2456 | */ | |
2457 | if (sock != NULL) { | |
2458 | sk = sock->sk; | |
2459 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2460 | return 0; | |
2461 | family = sk->sk_family; | |
2462 | } | |
2463 | /* | |
2464 | * Translate what netlabel gave us. | |
2465 | */ | |
e114e473 CS |
2466 | netlbl_secattr_init(&secattr); |
2467 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2468 | if (rc == 0) | |
2469 | smack_from_secattr(&secattr, smack); | |
2470 | netlbl_secattr_destroy(&secattr); | |
2471 | ||
2472 | /* | |
2473 | * Give up if we couldn't get anything | |
2474 | */ | |
2475 | if (rc != 0) | |
2476 | return rc; | |
2477 | ||
2478 | s = smack_to_secid(smack); | |
2479 | if (s == 0) | |
2480 | return -EINVAL; | |
2481 | ||
2482 | *secid = s; | |
2483 | return 0; | |
2484 | } | |
2485 | ||
2486 | /** | |
07feee8f PM |
2487 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2488 | * @sk: child sock | |
2489 | * @parent: parent socket | |
e114e473 | 2490 | * |
07feee8f PM |
2491 | * Set the smk_{in,out} state of an existing sock based on the process that |
2492 | * is creating the new socket. | |
e114e473 CS |
2493 | */ |
2494 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2495 | { | |
2496 | struct socket_smack *ssp; | |
e114e473 | 2497 | |
07feee8f PM |
2498 | if (sk == NULL || |
2499 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
2500 | return; |
2501 | ||
2502 | ssp = sk->sk_security; | |
86a264ab | 2503 | ssp->smk_in = ssp->smk_out = current_security(); |
07feee8f | 2504 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
2505 | } |
2506 | ||
2507 | /** | |
2508 | * smack_inet_conn_request - Smack access check on connect | |
2509 | * @sk: socket involved | |
2510 | * @skb: packet | |
2511 | * @req: unused | |
2512 | * | |
2513 | * Returns 0 if a task with the packet label could write to | |
2514 | * the socket, otherwise an error code | |
2515 | */ | |
2516 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2517 | struct request_sock *req) | |
2518 | { | |
07feee8f | 2519 | u16 family = sk->sk_family; |
e114e473 | 2520 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
2521 | struct netlbl_lsm_secattr secattr; |
2522 | struct sockaddr_in addr; | |
2523 | struct iphdr *hdr; | |
e114e473 CS |
2524 | char smack[SMK_LABELLEN]; |
2525 | int rc; | |
2526 | ||
07feee8f PM |
2527 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2528 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
2529 | family = PF_INET; | |
e114e473 | 2530 | |
07feee8f PM |
2531 | netlbl_secattr_init(&secattr); |
2532 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 2533 | if (rc == 0) |
07feee8f | 2534 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
2535 | else |
2536 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
2537 | netlbl_secattr_destroy(&secattr); |
2538 | ||
e114e473 | 2539 | /* |
07feee8f PM |
2540 | * Receiving a packet requires that the other end be able to write |
2541 | * here. Read access is not required. | |
e114e473 CS |
2542 | */ |
2543 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE); | |
07feee8f PM |
2544 | if (rc != 0) |
2545 | return rc; | |
2546 | ||
2547 | /* | |
2548 | * Save the peer's label in the request_sock so we can later setup | |
2549 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
2550 | */ | |
2551 | req->peer_secid = smack_to_secid(smack); | |
2552 | ||
2553 | /* | |
2554 | * We need to decide if we want to label the incoming connection here | |
2555 | * if we do we only need to label the request_sock and the stack will | |
2556 | * propogate the wire-label to the sock when it is created. | |
2557 | */ | |
2558 | hdr = ip_hdr(skb); | |
2559 | addr.sin_addr.s_addr = hdr->saddr; | |
2560 | rcu_read_lock(); | |
2561 | if (smack_host_label(&addr) == NULL) { | |
2562 | rcu_read_unlock(); | |
2563 | netlbl_secattr_init(&secattr); | |
2564 | smack_to_secattr(smack, &secattr); | |
2565 | rc = netlbl_req_setattr(req, &secattr); | |
2566 | netlbl_secattr_destroy(&secattr); | |
2567 | } else { | |
2568 | rcu_read_unlock(); | |
2569 | netlbl_req_delattr(req); | |
2570 | } | |
e114e473 CS |
2571 | |
2572 | return rc; | |
2573 | } | |
2574 | ||
07feee8f PM |
2575 | /** |
2576 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
2577 | * @sk: the new socket | |
2578 | * @req: the connection's request_sock | |
2579 | * | |
2580 | * Transfer the connection's peer label to the newly created socket. | |
2581 | */ | |
2582 | static void smack_inet_csk_clone(struct sock *sk, | |
2583 | const struct request_sock *req) | |
2584 | { | |
2585 | struct socket_smack *ssp = sk->sk_security; | |
2586 | char *smack; | |
2587 | ||
2588 | if (req->peer_secid != 0) { | |
2589 | smack = smack_from_secid(req->peer_secid); | |
2590 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2591 | } else | |
2592 | ssp->smk_packet[0] = '\0'; | |
2593 | } | |
2594 | ||
e114e473 CS |
2595 | /* |
2596 | * Key management security hooks | |
2597 | * | |
2598 | * Casey has not tested key support very heavily. | |
2599 | * The permission check is most likely too restrictive. | |
2600 | * If you care about keys please have a look. | |
2601 | */ | |
2602 | #ifdef CONFIG_KEYS | |
2603 | ||
2604 | /** | |
2605 | * smack_key_alloc - Set the key security blob | |
2606 | * @key: object | |
d84f4f99 | 2607 | * @cred: the credentials to use |
e114e473 CS |
2608 | * @flags: unused |
2609 | * | |
2610 | * No allocation required | |
2611 | * | |
2612 | * Returns 0 | |
2613 | */ | |
d84f4f99 | 2614 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
2615 | unsigned long flags) |
2616 | { | |
d84f4f99 | 2617 | key->security = cred->security; |
e114e473 CS |
2618 | return 0; |
2619 | } | |
2620 | ||
2621 | /** | |
2622 | * smack_key_free - Clear the key security blob | |
2623 | * @key: the object | |
2624 | * | |
2625 | * Clear the blob pointer | |
2626 | */ | |
2627 | static void smack_key_free(struct key *key) | |
2628 | { | |
2629 | key->security = NULL; | |
2630 | } | |
2631 | ||
2632 | /* | |
2633 | * smack_key_permission - Smack access on a key | |
2634 | * @key_ref: gets to the object | |
d84f4f99 | 2635 | * @cred: the credentials to use |
e114e473 CS |
2636 | * @perm: unused |
2637 | * | |
2638 | * Return 0 if the task has read and write to the object, | |
2639 | * an error code otherwise | |
2640 | */ | |
2641 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 2642 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
2643 | { |
2644 | struct key *keyp; | |
2645 | ||
2646 | keyp = key_ref_to_ptr(key_ref); | |
2647 | if (keyp == NULL) | |
2648 | return -EINVAL; | |
2649 | /* | |
2650 | * If the key hasn't been initialized give it access so that | |
2651 | * it may do so. | |
2652 | */ | |
2653 | if (keyp->security == NULL) | |
2654 | return 0; | |
2655 | /* | |
2656 | * This should not occur | |
2657 | */ | |
d84f4f99 | 2658 | if (cred->security == NULL) |
e114e473 CS |
2659 | return -EACCES; |
2660 | ||
d84f4f99 | 2661 | return smk_access(cred->security, keyp->security, MAY_READWRITE); |
e114e473 CS |
2662 | } |
2663 | #endif /* CONFIG_KEYS */ | |
2664 | ||
d20bdda6 AD |
2665 | /* |
2666 | * Smack Audit hooks | |
2667 | * | |
2668 | * Audit requires a unique representation of each Smack specific | |
2669 | * rule. This unique representation is used to distinguish the | |
2670 | * object to be audited from remaining kernel objects and also | |
2671 | * works as a glue between the audit hooks. | |
2672 | * | |
2673 | * Since repository entries are added but never deleted, we'll use | |
2674 | * the smack_known label address related to the given audit rule as | |
2675 | * the needed unique representation. This also better fits the smack | |
2676 | * model where nearly everything is a label. | |
2677 | */ | |
2678 | #ifdef CONFIG_AUDIT | |
2679 | ||
2680 | /** | |
2681 | * smack_audit_rule_init - Initialize a smack audit rule | |
2682 | * @field: audit rule fields given from user-space (audit.h) | |
2683 | * @op: required testing operator (=, !=, >, <, ...) | |
2684 | * @rulestr: smack label to be audited | |
2685 | * @vrule: pointer to save our own audit rule representation | |
2686 | * | |
2687 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2688 | * The label to be audited is created if necessay. | |
2689 | */ | |
2690 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2691 | { | |
2692 | char **rule = (char **)vrule; | |
2693 | *rule = NULL; | |
2694 | ||
2695 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2696 | return -EINVAL; | |
2697 | ||
5af75d8d | 2698 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
2699 | return -EINVAL; |
2700 | ||
2701 | *rule = smk_import(rulestr, 0); | |
2702 | ||
2703 | return 0; | |
2704 | } | |
2705 | ||
2706 | /** | |
2707 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2708 | * @krule: rule of interest, in Audit kernel representation format | |
2709 | * | |
2710 | * This is used to filter Smack rules from remaining Audit ones. | |
2711 | * If it's proved that this rule belongs to us, the | |
2712 | * audit_rule_match hook will be called to do the final judgement. | |
2713 | */ | |
2714 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2715 | { | |
2716 | struct audit_field *f; | |
2717 | int i; | |
2718 | ||
2719 | for (i = 0; i < krule->field_count; i++) { | |
2720 | f = &krule->fields[i]; | |
2721 | ||
2722 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2723 | return 1; | |
2724 | } | |
2725 | ||
2726 | return 0; | |
2727 | } | |
2728 | ||
2729 | /** | |
2730 | * smack_audit_rule_match - Audit given object ? | |
2731 | * @secid: security id for identifying the object to test | |
2732 | * @field: audit rule flags given from user-space | |
2733 | * @op: required testing operator | |
2734 | * @vrule: smack internal rule presentation | |
2735 | * @actx: audit context associated with the check | |
2736 | * | |
2737 | * The core Audit hook. It's used to take the decision of | |
2738 | * whether to audit or not to audit a given object. | |
2739 | */ | |
2740 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2741 | struct audit_context *actx) | |
2742 | { | |
2743 | char *smack; | |
2744 | char *rule = vrule; | |
2745 | ||
2746 | if (!rule) { | |
2747 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2748 | "Smack: missing rule\n"); | |
2749 | return -ENOENT; | |
2750 | } | |
2751 | ||
2752 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2753 | return 0; | |
2754 | ||
2755 | smack = smack_from_secid(secid); | |
2756 | ||
2757 | /* | |
2758 | * No need to do string comparisons. If a match occurs, | |
2759 | * both pointers will point to the same smack_known | |
2760 | * label. | |
2761 | */ | |
5af75d8d | 2762 | if (op == Audit_equal) |
d20bdda6 | 2763 | return (rule == smack); |
5af75d8d | 2764 | if (op == Audit_not_equal) |
d20bdda6 AD |
2765 | return (rule != smack); |
2766 | ||
2767 | return 0; | |
2768 | } | |
2769 | ||
2770 | /** | |
2771 | * smack_audit_rule_free - free smack rule representation | |
2772 | * @vrule: rule to be freed. | |
2773 | * | |
2774 | * No memory was allocated. | |
2775 | */ | |
2776 | static void smack_audit_rule_free(void *vrule) | |
2777 | { | |
2778 | /* No-op */ | |
2779 | } | |
2780 | ||
2781 | #endif /* CONFIG_AUDIT */ | |
2782 | ||
251a2a95 | 2783 | /** |
e114e473 CS |
2784 | * smack_secid_to_secctx - return the smack label for a secid |
2785 | * @secid: incoming integer | |
2786 | * @secdata: destination | |
2787 | * @seclen: how long it is | |
2788 | * | |
2789 | * Exists for networking code. | |
2790 | */ | |
2791 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
2792 | { | |
2793 | char *sp = smack_from_secid(secid); | |
2794 | ||
2795 | *secdata = sp; | |
2796 | *seclen = strlen(sp); | |
2797 | return 0; | |
2798 | } | |
2799 | ||
251a2a95 | 2800 | /** |
4bc87e62 CS |
2801 | * smack_secctx_to_secid - return the secid for a smack label |
2802 | * @secdata: smack label | |
2803 | * @seclen: how long result is | |
2804 | * @secid: outgoing integer | |
2805 | * | |
2806 | * Exists for audit and networking code. | |
2807 | */ | |
e52c1764 | 2808 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
2809 | { |
2810 | *secid = smack_to_secid(secdata); | |
2811 | return 0; | |
2812 | } | |
2813 | ||
251a2a95 | 2814 | /** |
e114e473 | 2815 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
2816 | * @secdata: unused |
2817 | * @seclen: unused | |
e114e473 CS |
2818 | * |
2819 | * Exists to make sure nothing gets done, and properly | |
2820 | */ | |
2821 | static void smack_release_secctx(char *secdata, u32 seclen) | |
2822 | { | |
2823 | } | |
2824 | ||
076c54c5 AD |
2825 | struct security_operations smack_ops = { |
2826 | .name = "smack", | |
2827 | ||
5cd9c58f DH |
2828 | .ptrace_may_access = smack_ptrace_may_access, |
2829 | .ptrace_traceme = smack_ptrace_traceme, | |
e114e473 | 2830 | .capget = cap_capget, |
d84f4f99 | 2831 | .capset = cap_capset, |
e114e473 CS |
2832 | .capable = cap_capable, |
2833 | .syslog = smack_syslog, | |
2834 | .settime = cap_settime, | |
2835 | .vm_enough_memory = cap_vm_enough_memory, | |
2836 | ||
a6f76f23 | 2837 | .bprm_set_creds = cap_bprm_set_creds, |
e114e473 CS |
2838 | .bprm_secureexec = cap_bprm_secureexec, |
2839 | ||
2840 | .sb_alloc_security = smack_sb_alloc_security, | |
2841 | .sb_free_security = smack_sb_free_security, | |
2842 | .sb_copy_data = smack_sb_copy_data, | |
2843 | .sb_kern_mount = smack_sb_kern_mount, | |
2844 | .sb_statfs = smack_sb_statfs, | |
2845 | .sb_mount = smack_sb_mount, | |
2846 | .sb_umount = smack_sb_umount, | |
2847 | ||
2848 | .inode_alloc_security = smack_inode_alloc_security, | |
2849 | .inode_free_security = smack_inode_free_security, | |
2850 | .inode_init_security = smack_inode_init_security, | |
2851 | .inode_link = smack_inode_link, | |
2852 | .inode_unlink = smack_inode_unlink, | |
2853 | .inode_rmdir = smack_inode_rmdir, | |
2854 | .inode_rename = smack_inode_rename, | |
2855 | .inode_permission = smack_inode_permission, | |
2856 | .inode_setattr = smack_inode_setattr, | |
2857 | .inode_getattr = smack_inode_getattr, | |
2858 | .inode_setxattr = smack_inode_setxattr, | |
2859 | .inode_post_setxattr = smack_inode_post_setxattr, | |
2860 | .inode_getxattr = smack_inode_getxattr, | |
2861 | .inode_removexattr = smack_inode_removexattr, | |
bcdca225 CS |
2862 | .inode_need_killpriv = cap_inode_need_killpriv, |
2863 | .inode_killpriv = cap_inode_killpriv, | |
e114e473 CS |
2864 | .inode_getsecurity = smack_inode_getsecurity, |
2865 | .inode_setsecurity = smack_inode_setsecurity, | |
2866 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 2867 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
2868 | |
2869 | .file_permission = smack_file_permission, | |
2870 | .file_alloc_security = smack_file_alloc_security, | |
2871 | .file_free_security = smack_file_free_security, | |
2872 | .file_ioctl = smack_file_ioctl, | |
2873 | .file_lock = smack_file_lock, | |
2874 | .file_fcntl = smack_file_fcntl, | |
2875 | .file_set_fowner = smack_file_set_fowner, | |
2876 | .file_send_sigiotask = smack_file_send_sigiotask, | |
2877 | .file_receive = smack_file_receive, | |
2878 | ||
f1752eec | 2879 | .cred_free = smack_cred_free, |
d84f4f99 DH |
2880 | .cred_prepare = smack_cred_prepare, |
2881 | .cred_commit = smack_cred_commit, | |
3a3b7ce9 DH |
2882 | .kernel_act_as = smack_kernel_act_as, |
2883 | .kernel_create_files_as = smack_kernel_create_files_as, | |
d84f4f99 | 2884 | .task_fix_setuid = cap_task_fix_setuid, |
e114e473 CS |
2885 | .task_setpgid = smack_task_setpgid, |
2886 | .task_getpgid = smack_task_getpgid, | |
2887 | .task_getsid = smack_task_getsid, | |
2888 | .task_getsecid = smack_task_getsecid, | |
2889 | .task_setnice = smack_task_setnice, | |
2890 | .task_setioprio = smack_task_setioprio, | |
2891 | .task_getioprio = smack_task_getioprio, | |
2892 | .task_setscheduler = smack_task_setscheduler, | |
2893 | .task_getscheduler = smack_task_getscheduler, | |
2894 | .task_movememory = smack_task_movememory, | |
2895 | .task_kill = smack_task_kill, | |
2896 | .task_wait = smack_task_wait, | |
e114e473 | 2897 | .task_to_inode = smack_task_to_inode, |
1236cc3c | 2898 | .task_prctl = cap_task_prctl, |
e114e473 CS |
2899 | |
2900 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 2901 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
2902 | |
2903 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
2904 | .msg_msg_free_security = smack_msg_msg_free_security, | |
2905 | ||
2906 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
2907 | .msg_queue_free_security = smack_msg_queue_free_security, | |
2908 | .msg_queue_associate = smack_msg_queue_associate, | |
2909 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
2910 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
2911 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
2912 | ||
2913 | .shm_alloc_security = smack_shm_alloc_security, | |
2914 | .shm_free_security = smack_shm_free_security, | |
2915 | .shm_associate = smack_shm_associate, | |
2916 | .shm_shmctl = smack_shm_shmctl, | |
2917 | .shm_shmat = smack_shm_shmat, | |
2918 | ||
2919 | .sem_alloc_security = smack_sem_alloc_security, | |
2920 | .sem_free_security = smack_sem_free_security, | |
2921 | .sem_associate = smack_sem_associate, | |
2922 | .sem_semctl = smack_sem_semctl, | |
2923 | .sem_semop = smack_sem_semop, | |
2924 | ||
2925 | .netlink_send = cap_netlink_send, | |
2926 | .netlink_recv = cap_netlink_recv, | |
2927 | ||
2928 | .d_instantiate = smack_d_instantiate, | |
2929 | ||
2930 | .getprocattr = smack_getprocattr, | |
2931 | .setprocattr = smack_setprocattr, | |
2932 | ||
2933 | .unix_stream_connect = smack_unix_stream_connect, | |
2934 | .unix_may_send = smack_unix_may_send, | |
2935 | ||
2936 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
2937 | .socket_connect = smack_socket_connect, |
2938 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
2939 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
2940 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
2941 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
2942 | .sk_alloc_security = smack_sk_alloc_security, | |
2943 | .sk_free_security = smack_sk_free_security, | |
2944 | .sock_graft = smack_sock_graft, | |
2945 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 2946 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 2947 | |
e114e473 CS |
2948 | /* key management security hooks */ |
2949 | #ifdef CONFIG_KEYS | |
2950 | .key_alloc = smack_key_alloc, | |
2951 | .key_free = smack_key_free, | |
2952 | .key_permission = smack_key_permission, | |
2953 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
2954 | |
2955 | /* Audit hooks */ | |
2956 | #ifdef CONFIG_AUDIT | |
2957 | .audit_rule_init = smack_audit_rule_init, | |
2958 | .audit_rule_known = smack_audit_rule_known, | |
2959 | .audit_rule_match = smack_audit_rule_match, | |
2960 | .audit_rule_free = smack_audit_rule_free, | |
2961 | #endif /* CONFIG_AUDIT */ | |
2962 | ||
e114e473 | 2963 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 2964 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 CS |
2965 | .release_secctx = smack_release_secctx, |
2966 | }; | |
2967 | ||
7198e2ee EB |
2968 | |
2969 | static __init void init_smack_know_list(void) | |
2970 | { | |
2971 | list_add(&smack_known_huh.list, &smack_known_list); | |
2972 | list_add(&smack_known_hat.list, &smack_known_list); | |
2973 | list_add(&smack_known_star.list, &smack_known_list); | |
2974 | list_add(&smack_known_floor.list, &smack_known_list); | |
2975 | list_add(&smack_known_invalid.list, &smack_known_list); | |
2976 | list_add(&smack_known_web.list, &smack_known_list); | |
2977 | } | |
2978 | ||
e114e473 CS |
2979 | /** |
2980 | * smack_init - initialize the smack system | |
2981 | * | |
2982 | * Returns 0 | |
2983 | */ | |
2984 | static __init int smack_init(void) | |
2985 | { | |
d84f4f99 DH |
2986 | struct cred *cred; |
2987 | ||
076c54c5 AD |
2988 | if (!security_module_enable(&smack_ops)) |
2989 | return 0; | |
2990 | ||
e114e473 CS |
2991 | printk(KERN_INFO "Smack: Initializing.\n"); |
2992 | ||
2993 | /* | |
2994 | * Set the security state for the initial task. | |
2995 | */ | |
d84f4f99 DH |
2996 | cred = (struct cred *) current->cred; |
2997 | cred->security = &smack_known_floor.smk_known; | |
e114e473 | 2998 | |
7198e2ee EB |
2999 | /* initilize the smack_know_list */ |
3000 | init_smack_know_list(); | |
e114e473 CS |
3001 | /* |
3002 | * Initialize locks | |
3003 | */ | |
e114e473 CS |
3004 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3005 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3006 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3007 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3008 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3009 | ||
3010 | /* | |
3011 | * Register with LSM | |
3012 | */ | |
3013 | if (register_security(&smack_ops)) | |
3014 | panic("smack: Unable to register with kernel.\n"); | |
3015 | ||
3016 | return 0; | |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * Smack requires early initialization in order to label | |
3021 | * all processes and objects when they are created. | |
3022 | */ | |
3023 | security_initcall(smack_init); |