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> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2, | |
13 | * as published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/xattr.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/mount.h> | |
19 | #include <linux/stat.h> | |
20 | #include <linux/ext2_fs.h> | |
21 | #include <linux/kd.h> | |
22 | #include <asm/ioctls.h> | |
23 | #include <linux/tcp.h> | |
24 | #include <linux/udp.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/pipe_fs_i.h> | |
27 | #include <net/netlabel.h> | |
28 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 29 | #include <linux/audit.h> |
e114e473 CS |
30 | |
31 | #include "smack.h" | |
32 | ||
33 | /* | |
34 | * I hope these are the hokeyist lines of code in the module. Casey. | |
35 | */ | |
36 | #define DEVPTS_SUPER_MAGIC 0x1cd1 | |
37 | #define SOCKFS_MAGIC 0x534F434B | |
38 | #define TMPFS_MAGIC 0x01021994 | |
39 | ||
40 | /** | |
41 | * smk_fetch - Fetch the smack label from a file. | |
42 | * @ip: a pointer to the inode | |
43 | * @dp: a pointer to the dentry | |
44 | * | |
45 | * Returns a pointer to the master list entry for the Smack label | |
46 | * or NULL if there was no label to fetch. | |
47 | */ | |
48 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
49 | { | |
50 | int rc; | |
51 | char in[SMK_LABELLEN]; | |
52 | ||
53 | if (ip->i_op->getxattr == NULL) | |
54 | return NULL; | |
55 | ||
56 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
57 | if (rc < 0) | |
58 | return NULL; | |
59 | ||
60 | return smk_import(in, rc); | |
61 | } | |
62 | ||
63 | /** | |
64 | * new_inode_smack - allocate an inode security blob | |
65 | * @smack: a pointer to the Smack label to use in the blob | |
66 | * | |
67 | * Returns the new blob or NULL if there's no memory available | |
68 | */ | |
69 | struct inode_smack *new_inode_smack(char *smack) | |
70 | { | |
71 | struct inode_smack *isp; | |
72 | ||
73 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
74 | if (isp == NULL) | |
75 | return NULL; | |
76 | ||
77 | isp->smk_inode = smack; | |
78 | isp->smk_flags = 0; | |
79 | mutex_init(&isp->smk_lock); | |
80 | ||
81 | return isp; | |
82 | } | |
83 | ||
84 | /* | |
85 | * LSM hooks. | |
86 | * We he, that is fun! | |
87 | */ | |
88 | ||
89 | /** | |
5cd9c58f | 90 | * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH |
e114e473 CS |
91 | * @ctp: child task pointer |
92 | * | |
93 | * Returns 0 if access is OK, an error code otherwise | |
94 | * | |
95 | * Do the capability checks, and require read and write. | |
96 | */ | |
5cd9c58f | 97 | static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
98 | { |
99 | int rc; | |
100 | ||
5cd9c58f | 101 | rc = cap_ptrace_may_access(ctp, mode); |
e114e473 CS |
102 | if (rc != 0) |
103 | return rc; | |
104 | ||
b6dff3ec DH |
105 | rc = smk_access(current->cred->security, ctp->cred->security, |
106 | MAY_READWRITE); | |
5cd9c58f | 107 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
e114e473 | 108 | return 0; |
5cd9c58f DH |
109 | return rc; |
110 | } | |
111 | ||
112 | /** | |
113 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
114 | * @ptp: parent task pointer | |
115 | * | |
116 | * Returns 0 if access is OK, an error code otherwise | |
117 | * | |
118 | * Do the capability checks, and require read and write. | |
119 | */ | |
120 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
121 | { | |
122 | int rc; | |
123 | ||
124 | rc = cap_ptrace_traceme(ptp); | |
125 | if (rc != 0) | |
126 | return rc; | |
e114e473 | 127 | |
b6dff3ec DH |
128 | rc = smk_access(ptp->cred->security, current->cred->security, |
129 | MAY_READWRITE); | |
5cd9c58f DH |
130 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
131 | return 0; | |
e114e473 CS |
132 | return rc; |
133 | } | |
134 | ||
135 | /** | |
136 | * smack_syslog - Smack approval on syslog | |
137 | * @type: message type | |
138 | * | |
139 | * Require that the task has the floor label | |
140 | * | |
141 | * Returns 0 on success, error code otherwise. | |
142 | */ | |
143 | static int smack_syslog(int type) | |
144 | { | |
145 | int rc; | |
86a264ab | 146 | char *sp = current_security(); |
e114e473 CS |
147 | |
148 | rc = cap_syslog(type); | |
149 | if (rc != 0) | |
150 | return rc; | |
151 | ||
152 | if (capable(CAP_MAC_OVERRIDE)) | |
153 | return 0; | |
154 | ||
155 | if (sp != smack_known_floor.smk_known) | |
156 | rc = -EACCES; | |
157 | ||
158 | return rc; | |
159 | } | |
160 | ||
161 | ||
162 | /* | |
163 | * Superblock Hooks. | |
164 | */ | |
165 | ||
166 | /** | |
167 | * smack_sb_alloc_security - allocate a superblock blob | |
168 | * @sb: the superblock getting the blob | |
169 | * | |
170 | * Returns 0 on success or -ENOMEM on error. | |
171 | */ | |
172 | static int smack_sb_alloc_security(struct super_block *sb) | |
173 | { | |
174 | struct superblock_smack *sbsp; | |
175 | ||
176 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
177 | ||
178 | if (sbsp == NULL) | |
179 | return -ENOMEM; | |
180 | ||
181 | sbsp->smk_root = smack_known_floor.smk_known; | |
182 | sbsp->smk_default = smack_known_floor.smk_known; | |
183 | sbsp->smk_floor = smack_known_floor.smk_known; | |
184 | sbsp->smk_hat = smack_known_hat.smk_known; | |
185 | sbsp->smk_initialized = 0; | |
186 | spin_lock_init(&sbsp->smk_sblock); | |
187 | ||
188 | sb->s_security = sbsp; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /** | |
194 | * smack_sb_free_security - free a superblock blob | |
195 | * @sb: the superblock getting the blob | |
196 | * | |
197 | */ | |
198 | static void smack_sb_free_security(struct super_block *sb) | |
199 | { | |
200 | kfree(sb->s_security); | |
201 | sb->s_security = NULL; | |
202 | } | |
203 | ||
204 | /** | |
205 | * smack_sb_copy_data - copy mount options data for processing | |
206 | * @type: file system type | |
207 | * @orig: where to start | |
208 | * @smackopts | |
209 | * | |
210 | * Returns 0 on success or -ENOMEM on error. | |
211 | * | |
212 | * Copy the Smack specific mount options out of the mount | |
213 | * options list. | |
214 | */ | |
e0007529 | 215 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
216 | { |
217 | char *cp, *commap, *otheropts, *dp; | |
218 | ||
e114e473 CS |
219 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
220 | if (otheropts == NULL) | |
221 | return -ENOMEM; | |
222 | ||
223 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
224 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
225 | dp = smackopts; | |
226 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
227 | dp = smackopts; | |
228 | else if (strstr(cp, SMK_FSHAT) == cp) | |
229 | dp = smackopts; | |
230 | else if (strstr(cp, SMK_FSROOT) == cp) | |
231 | dp = smackopts; | |
232 | else | |
233 | dp = otheropts; | |
234 | ||
235 | commap = strchr(cp, ','); | |
236 | if (commap != NULL) | |
237 | *commap = '\0'; | |
238 | ||
239 | if (*dp != '\0') | |
240 | strcat(dp, ","); | |
241 | strcat(dp, cp); | |
242 | } | |
243 | ||
244 | strcpy(orig, otheropts); | |
245 | free_page((unsigned long)otheropts); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | /** | |
251 | * smack_sb_kern_mount - Smack specific mount processing | |
252 | * @sb: the file system superblock | |
253 | * @data: the smack mount options | |
254 | * | |
255 | * Returns 0 on success, an error code on failure | |
256 | */ | |
257 | static int smack_sb_kern_mount(struct super_block *sb, void *data) | |
258 | { | |
259 | struct dentry *root = sb->s_root; | |
260 | struct inode *inode = root->d_inode; | |
261 | struct superblock_smack *sp = sb->s_security; | |
262 | struct inode_smack *isp; | |
263 | char *op; | |
264 | char *commap; | |
265 | char *nsp; | |
266 | ||
267 | spin_lock(&sp->smk_sblock); | |
268 | if (sp->smk_initialized != 0) { | |
269 | spin_unlock(&sp->smk_sblock); | |
270 | return 0; | |
271 | } | |
272 | sp->smk_initialized = 1; | |
273 | spin_unlock(&sp->smk_sblock); | |
274 | ||
275 | for (op = data; op != NULL; op = commap) { | |
276 | commap = strchr(op, ','); | |
277 | if (commap != NULL) | |
278 | *commap++ = '\0'; | |
279 | ||
280 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
281 | op += strlen(SMK_FSHAT); | |
282 | nsp = smk_import(op, 0); | |
283 | if (nsp != NULL) | |
284 | sp->smk_hat = nsp; | |
285 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
286 | op += strlen(SMK_FSFLOOR); | |
287 | nsp = smk_import(op, 0); | |
288 | if (nsp != NULL) | |
289 | sp->smk_floor = nsp; | |
290 | } else if (strncmp(op, SMK_FSDEFAULT, | |
291 | strlen(SMK_FSDEFAULT)) == 0) { | |
292 | op += strlen(SMK_FSDEFAULT); | |
293 | nsp = smk_import(op, 0); | |
294 | if (nsp != NULL) | |
295 | sp->smk_default = nsp; | |
296 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
297 | op += strlen(SMK_FSROOT); | |
298 | nsp = smk_import(op, 0); | |
299 | if (nsp != NULL) | |
300 | sp->smk_root = nsp; | |
301 | } | |
302 | } | |
303 | ||
304 | /* | |
305 | * Initialize the root inode. | |
306 | */ | |
307 | isp = inode->i_security; | |
308 | if (isp == NULL) | |
309 | inode->i_security = new_inode_smack(sp->smk_root); | |
310 | else | |
311 | isp->smk_inode = sp->smk_root; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | /** | |
317 | * smack_sb_statfs - Smack check on statfs | |
318 | * @dentry: identifies the file system in question | |
319 | * | |
320 | * Returns 0 if current can read the floor of the filesystem, | |
321 | * and error code otherwise | |
322 | */ | |
323 | static int smack_sb_statfs(struct dentry *dentry) | |
324 | { | |
325 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
326 | ||
327 | return smk_curacc(sbp->smk_floor, MAY_READ); | |
328 | } | |
329 | ||
330 | /** | |
331 | * smack_sb_mount - Smack check for mounting | |
332 | * @dev_name: unused | |
333 | * @nd: mount point | |
334 | * @type: unused | |
335 | * @flags: unused | |
336 | * @data: unused | |
337 | * | |
338 | * Returns 0 if current can write the floor of the filesystem | |
339 | * being mounted on, an error code otherwise. | |
340 | */ | |
b5266eb4 | 341 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
342 | char *type, unsigned long flags, void *data) |
343 | { | |
b5266eb4 | 344 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
e114e473 CS |
345 | |
346 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
347 | } | |
348 | ||
349 | /** | |
350 | * smack_sb_umount - Smack check for unmounting | |
351 | * @mnt: file system to unmount | |
352 | * @flags: unused | |
353 | * | |
354 | * Returns 0 if current can write the floor of the filesystem | |
355 | * being unmounted, an error code otherwise. | |
356 | */ | |
357 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
358 | { | |
359 | struct superblock_smack *sbp; | |
360 | ||
361 | sbp = mnt->mnt_sb->s_security; | |
362 | ||
363 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Inode hooks | |
368 | */ | |
369 | ||
370 | /** | |
371 | * smack_inode_alloc_security - allocate an inode blob | |
372 | * @inode - the inode in need of a blob | |
373 | * | |
374 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
375 | */ | |
376 | static int smack_inode_alloc_security(struct inode *inode) | |
377 | { | |
86a264ab | 378 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
379 | if (inode->i_security == NULL) |
380 | return -ENOMEM; | |
381 | return 0; | |
382 | } | |
383 | ||
384 | /** | |
385 | * smack_inode_free_security - free an inode blob | |
386 | * @inode - the inode with a blob | |
387 | * | |
388 | * Clears the blob pointer in inode | |
389 | */ | |
390 | static void smack_inode_free_security(struct inode *inode) | |
391 | { | |
392 | kfree(inode->i_security); | |
393 | inode->i_security = NULL; | |
394 | } | |
395 | ||
396 | /** | |
397 | * smack_inode_init_security - copy out the smack from an inode | |
398 | * @inode: the inode | |
399 | * @dir: unused | |
400 | * @name: where to put the attribute name | |
401 | * @value: where to put the attribute value | |
402 | * @len: where to put the length of the attribute | |
403 | * | |
404 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
405 | */ | |
406 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
407 | char **name, void **value, size_t *len) | |
408 | { | |
409 | char *isp = smk_of_inode(inode); | |
410 | ||
411 | if (name) { | |
412 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
413 | if (*name == NULL) | |
414 | return -ENOMEM; | |
415 | } | |
416 | ||
417 | if (value) { | |
418 | *value = kstrdup(isp, GFP_KERNEL); | |
419 | if (*value == NULL) | |
420 | return -ENOMEM; | |
421 | } | |
422 | ||
423 | if (len) | |
424 | *len = strlen(isp) + 1; | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | /** | |
430 | * smack_inode_link - Smack check on link | |
431 | * @old_dentry: the existing object | |
432 | * @dir: unused | |
433 | * @new_dentry: the new object | |
434 | * | |
435 | * Returns 0 if access is permitted, an error code otherwise | |
436 | */ | |
437 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
438 | struct dentry *new_dentry) | |
439 | { | |
440 | int rc; | |
441 | char *isp; | |
442 | ||
443 | isp = smk_of_inode(old_dentry->d_inode); | |
444 | rc = smk_curacc(isp, MAY_WRITE); | |
445 | ||
446 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
447 | isp = smk_of_inode(new_dentry->d_inode); | |
448 | rc = smk_curacc(isp, MAY_WRITE); | |
449 | } | |
450 | ||
451 | return rc; | |
452 | } | |
453 | ||
454 | /** | |
455 | * smack_inode_unlink - Smack check on inode deletion | |
456 | * @dir: containing directory object | |
457 | * @dentry: file to unlink | |
458 | * | |
459 | * Returns 0 if current can write the containing directory | |
460 | * and the object, error code otherwise | |
461 | */ | |
462 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
463 | { | |
464 | struct inode *ip = dentry->d_inode; | |
465 | int rc; | |
466 | ||
467 | /* | |
468 | * You need write access to the thing you're unlinking | |
469 | */ | |
470 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE); | |
471 | if (rc == 0) | |
472 | /* | |
473 | * You also need write access to the containing directory | |
474 | */ | |
475 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
476 | ||
477 | return rc; | |
478 | } | |
479 | ||
480 | /** | |
481 | * smack_inode_rmdir - Smack check on directory deletion | |
482 | * @dir: containing directory object | |
483 | * @dentry: directory to unlink | |
484 | * | |
485 | * Returns 0 if current can write the containing directory | |
486 | * and the directory, error code otherwise | |
487 | */ | |
488 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
489 | { | |
490 | int rc; | |
491 | ||
492 | /* | |
493 | * You need write access to the thing you're removing | |
494 | */ | |
495 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
496 | if (rc == 0) | |
497 | /* | |
498 | * You also need write access to the containing directory | |
499 | */ | |
500 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
501 | ||
502 | return rc; | |
503 | } | |
504 | ||
505 | /** | |
506 | * smack_inode_rename - Smack check on rename | |
507 | * @old_inode: the old directory | |
508 | * @old_dentry: unused | |
509 | * @new_inode: the new directory | |
510 | * @new_dentry: unused | |
511 | * | |
512 | * Read and write access is required on both the old and | |
513 | * new directories. | |
514 | * | |
515 | * Returns 0 if access is permitted, an error code otherwise | |
516 | */ | |
517 | static int smack_inode_rename(struct inode *old_inode, | |
518 | struct dentry *old_dentry, | |
519 | struct inode *new_inode, | |
520 | struct dentry *new_dentry) | |
521 | { | |
522 | int rc; | |
523 | char *isp; | |
524 | ||
525 | isp = smk_of_inode(old_dentry->d_inode); | |
526 | rc = smk_curacc(isp, MAY_READWRITE); | |
527 | ||
528 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
529 | isp = smk_of_inode(new_dentry->d_inode); | |
530 | rc = smk_curacc(isp, MAY_READWRITE); | |
531 | } | |
532 | ||
533 | return rc; | |
534 | } | |
535 | ||
536 | /** | |
537 | * smack_inode_permission - Smack version of permission() | |
538 | * @inode: the inode in question | |
539 | * @mask: the access requested | |
540 | * @nd: unused | |
541 | * | |
542 | * This is the important Smack hook. | |
543 | * | |
544 | * Returns 0 if access is permitted, -EACCES otherwise | |
545 | */ | |
b77b0646 | 546 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 CS |
547 | { |
548 | /* | |
549 | * No permission to check. Existence test. Yup, it's there. | |
550 | */ | |
551 | if (mask == 0) | |
552 | return 0; | |
553 | ||
554 | return smk_curacc(smk_of_inode(inode), mask); | |
555 | } | |
556 | ||
557 | /** | |
558 | * smack_inode_setattr - Smack check for setting attributes | |
559 | * @dentry: the object | |
560 | * @iattr: for the force flag | |
561 | * | |
562 | * Returns 0 if access is permitted, an error code otherwise | |
563 | */ | |
564 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
565 | { | |
566 | /* | |
567 | * Need to allow for clearing the setuid bit. | |
568 | */ | |
569 | if (iattr->ia_valid & ATTR_FORCE) | |
570 | return 0; | |
571 | ||
572 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
573 | } | |
574 | ||
575 | /** | |
576 | * smack_inode_getattr - Smack check for getting attributes | |
577 | * @mnt: unused | |
578 | * @dentry: the object | |
579 | * | |
580 | * Returns 0 if access is permitted, an error code otherwise | |
581 | */ | |
582 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
583 | { | |
584 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
585 | } | |
586 | ||
587 | /** | |
588 | * smack_inode_setxattr - Smack check for setting xattrs | |
589 | * @dentry: the object | |
590 | * @name: name of the attribute | |
591 | * @value: unused | |
592 | * @size: unused | |
593 | * @flags: unused | |
594 | * | |
595 | * This protects the Smack attribute explicitly. | |
596 | * | |
597 | * Returns 0 if access is permitted, an error code otherwise | |
598 | */ | |
8f0cfa52 DH |
599 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
600 | const void *value, size_t size, int flags) | |
e114e473 | 601 | { |
bcdca225 | 602 | int rc = 0; |
e114e473 | 603 | |
bcdca225 CS |
604 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
605 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
606 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
607 | if (!capable(CAP_MAC_ADMIN)) | |
608 | rc = -EPERM; | |
609 | } else | |
610 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
611 | ||
612 | if (rc == 0) | |
613 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
614 | ||
615 | return rc; | |
e114e473 CS |
616 | } |
617 | ||
618 | /** | |
619 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
620 | * @dentry: object | |
621 | * @name: attribute name | |
622 | * @value: attribute value | |
623 | * @size: attribute size | |
624 | * @flags: unused | |
625 | * | |
626 | * Set the pointer in the inode blob to the entry found | |
627 | * in the master label list. | |
628 | */ | |
8f0cfa52 DH |
629 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
630 | const void *value, size_t size, int flags) | |
e114e473 CS |
631 | { |
632 | struct inode_smack *isp; | |
633 | char *nsp; | |
634 | ||
635 | /* | |
636 | * Not SMACK | |
637 | */ | |
638 | if (strcmp(name, XATTR_NAME_SMACK)) | |
639 | return; | |
640 | ||
641 | if (size >= SMK_LABELLEN) | |
642 | return; | |
643 | ||
644 | isp = dentry->d_inode->i_security; | |
645 | ||
646 | /* | |
647 | * No locking is done here. This is a pointer | |
648 | * assignment. | |
649 | */ | |
650 | nsp = smk_import(value, size); | |
651 | if (nsp != NULL) | |
652 | isp->smk_inode = nsp; | |
653 | else | |
654 | isp->smk_inode = smack_known_invalid.smk_known; | |
655 | ||
656 | return; | |
657 | } | |
658 | ||
659 | /* | |
660 | * smack_inode_getxattr - Smack check on getxattr | |
661 | * @dentry: the object | |
662 | * @name: unused | |
663 | * | |
664 | * Returns 0 if access is permitted, an error code otherwise | |
665 | */ | |
8f0cfa52 | 666 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 CS |
667 | { |
668 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
669 | } | |
670 | ||
671 | /* | |
672 | * smack_inode_removexattr - Smack check on removexattr | |
673 | * @dentry: the object | |
674 | * @name: name of the attribute | |
675 | * | |
676 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
677 | * | |
678 | * Returns 0 if access is permitted, an error code otherwise | |
679 | */ | |
8f0cfa52 | 680 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 681 | { |
bcdca225 | 682 | int rc = 0; |
e114e473 | 683 | |
bcdca225 CS |
684 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
685 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
686 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
687 | if (!capable(CAP_MAC_ADMIN)) | |
688 | rc = -EPERM; | |
689 | } else | |
690 | rc = cap_inode_removexattr(dentry, name); | |
691 | ||
692 | if (rc == 0) | |
693 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
694 | ||
695 | return rc; | |
e114e473 CS |
696 | } |
697 | ||
698 | /** | |
699 | * smack_inode_getsecurity - get smack xattrs | |
700 | * @inode: the object | |
701 | * @name: attribute name | |
702 | * @buffer: where to put the result | |
703 | * @size: size of the buffer | |
704 | * @err: unused | |
705 | * | |
706 | * Returns the size of the attribute or an error code | |
707 | */ | |
708 | static int smack_inode_getsecurity(const struct inode *inode, | |
709 | const char *name, void **buffer, | |
710 | bool alloc) | |
711 | { | |
712 | struct socket_smack *ssp; | |
713 | struct socket *sock; | |
714 | struct super_block *sbp; | |
715 | struct inode *ip = (struct inode *)inode; | |
716 | char *isp; | |
717 | int ilen; | |
718 | int rc = 0; | |
719 | ||
720 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
721 | isp = smk_of_inode(inode); | |
722 | ilen = strlen(isp) + 1; | |
723 | *buffer = isp; | |
724 | return ilen; | |
725 | } | |
726 | ||
727 | /* | |
728 | * The rest of the Smack xattrs are only on sockets. | |
729 | */ | |
730 | sbp = ip->i_sb; | |
731 | if (sbp->s_magic != SOCKFS_MAGIC) | |
732 | return -EOPNOTSUPP; | |
733 | ||
734 | sock = SOCKET_I(ip); | |
2e1d146a | 735 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
736 | return -EOPNOTSUPP; |
737 | ||
738 | ssp = sock->sk->sk_security; | |
739 | ||
740 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
741 | isp = ssp->smk_in; | |
742 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
743 | isp = ssp->smk_out; | |
744 | else | |
745 | return -EOPNOTSUPP; | |
746 | ||
747 | ilen = strlen(isp) + 1; | |
748 | if (rc == 0) { | |
749 | *buffer = isp; | |
750 | rc = ilen; | |
751 | } | |
752 | ||
753 | return rc; | |
754 | } | |
755 | ||
756 | ||
757 | /** | |
758 | * smack_inode_listsecurity - list the Smack attributes | |
759 | * @inode: the object | |
760 | * @buffer: where they go | |
761 | * @buffer_size: size of buffer | |
762 | * | |
763 | * Returns 0 on success, -EINVAL otherwise | |
764 | */ | |
765 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
766 | size_t buffer_size) | |
767 | { | |
768 | int len = strlen(XATTR_NAME_SMACK); | |
769 | ||
770 | if (buffer != NULL && len <= buffer_size) { | |
771 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
772 | return len; | |
773 | } | |
774 | return -EINVAL; | |
775 | } | |
776 | ||
d20bdda6 AD |
777 | /** |
778 | * smack_inode_getsecid - Extract inode's security id | |
779 | * @inode: inode to extract the info from | |
780 | * @secid: where result will be saved | |
781 | */ | |
782 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
783 | { | |
784 | struct inode_smack *isp = inode->i_security; | |
785 | ||
786 | *secid = smack_to_secid(isp->smk_inode); | |
787 | } | |
788 | ||
e114e473 CS |
789 | /* |
790 | * File Hooks | |
791 | */ | |
792 | ||
793 | /** | |
794 | * smack_file_permission - Smack check on file operations | |
795 | * @file: unused | |
796 | * @mask: unused | |
797 | * | |
798 | * Returns 0 | |
799 | * | |
800 | * Should access checks be done on each read or write? | |
801 | * UNICOS and SELinux say yes. | |
802 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
803 | * | |
804 | * I'll say no for now. Smack does not do the frequent | |
805 | * label changing that SELinux does. | |
806 | */ | |
807 | static int smack_file_permission(struct file *file, int mask) | |
808 | { | |
809 | return 0; | |
810 | } | |
811 | ||
812 | /** | |
813 | * smack_file_alloc_security - assign a file security blob | |
814 | * @file: the object | |
815 | * | |
816 | * The security blob for a file is a pointer to the master | |
817 | * label list, so no allocation is done. | |
818 | * | |
819 | * Returns 0 | |
820 | */ | |
821 | static int smack_file_alloc_security(struct file *file) | |
822 | { | |
86a264ab | 823 | file->f_security = current_security(); |
e114e473 CS |
824 | return 0; |
825 | } | |
826 | ||
827 | /** | |
828 | * smack_file_free_security - clear a file security blob | |
829 | * @file: the object | |
830 | * | |
831 | * The security blob for a file is a pointer to the master | |
832 | * label list, so no memory is freed. | |
833 | */ | |
834 | static void smack_file_free_security(struct file *file) | |
835 | { | |
836 | file->f_security = NULL; | |
837 | } | |
838 | ||
839 | /** | |
840 | * smack_file_ioctl - Smack check on ioctls | |
841 | * @file: the object | |
842 | * @cmd: what to do | |
843 | * @arg: unused | |
844 | * | |
845 | * Relies heavily on the correct use of the ioctl command conventions. | |
846 | * | |
847 | * Returns 0 if allowed, error code otherwise | |
848 | */ | |
849 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
850 | unsigned long arg) | |
851 | { | |
852 | int rc = 0; | |
853 | ||
854 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
855 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
856 | ||
857 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
858 | rc = smk_curacc(file->f_security, MAY_READ); | |
859 | ||
860 | return rc; | |
861 | } | |
862 | ||
863 | /** | |
864 | * smack_file_lock - Smack check on file locking | |
865 | * @file: the object | |
866 | * @cmd unused | |
867 | * | |
868 | * Returns 0 if current has write access, error code otherwise | |
869 | */ | |
870 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
871 | { | |
872 | return smk_curacc(file->f_security, MAY_WRITE); | |
873 | } | |
874 | ||
875 | /** | |
876 | * smack_file_fcntl - Smack check on fcntl | |
877 | * @file: the object | |
878 | * @cmd: what action to check | |
879 | * @arg: unused | |
880 | * | |
881 | * Returns 0 if current has access, error code otherwise | |
882 | */ | |
883 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
884 | unsigned long arg) | |
885 | { | |
886 | int rc; | |
887 | ||
888 | switch (cmd) { | |
889 | case F_DUPFD: | |
890 | case F_GETFD: | |
891 | case F_GETFL: | |
892 | case F_GETLK: | |
893 | case F_GETOWN: | |
894 | case F_GETSIG: | |
895 | rc = smk_curacc(file->f_security, MAY_READ); | |
896 | break; | |
897 | case F_SETFD: | |
898 | case F_SETFL: | |
899 | case F_SETLK: | |
900 | case F_SETLKW: | |
901 | case F_SETOWN: | |
902 | case F_SETSIG: | |
903 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
904 | break; | |
905 | default: | |
906 | rc = smk_curacc(file->f_security, MAY_READWRITE); | |
907 | } | |
908 | ||
909 | return rc; | |
910 | } | |
911 | ||
912 | /** | |
913 | * smack_file_set_fowner - set the file security blob value | |
914 | * @file: object in question | |
915 | * | |
916 | * Returns 0 | |
917 | * Further research may be required on this one. | |
918 | */ | |
919 | static int smack_file_set_fowner(struct file *file) | |
920 | { | |
86a264ab | 921 | file->f_security = current_security(); |
e114e473 CS |
922 | return 0; |
923 | } | |
924 | ||
925 | /** | |
926 | * smack_file_send_sigiotask - Smack on sigio | |
927 | * @tsk: The target task | |
928 | * @fown: the object the signal come from | |
929 | * @signum: unused | |
930 | * | |
931 | * Allow a privileged task to get signals even if it shouldn't | |
932 | * | |
933 | * Returns 0 if a subject with the object's smack could | |
934 | * write to the task, an error code otherwise. | |
935 | */ | |
936 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
937 | struct fown_struct *fown, int signum) | |
938 | { | |
939 | struct file *file; | |
940 | int rc; | |
941 | ||
942 | /* | |
943 | * struct fown_struct is never outside the context of a struct file | |
944 | */ | |
945 | file = container_of(fown, struct file, f_owner); | |
b6dff3ec | 946 | rc = smk_access(file->f_security, tsk->cred->security, MAY_WRITE); |
5cd9c58f | 947 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
e114e473 CS |
948 | return 0; |
949 | return rc; | |
950 | } | |
951 | ||
952 | /** | |
953 | * smack_file_receive - Smack file receive check | |
954 | * @file: the object | |
955 | * | |
956 | * Returns 0 if current has access, error code otherwise | |
957 | */ | |
958 | static int smack_file_receive(struct file *file) | |
959 | { | |
960 | int may = 0; | |
961 | ||
962 | /* | |
963 | * This code relies on bitmasks. | |
964 | */ | |
965 | if (file->f_mode & FMODE_READ) | |
966 | may = MAY_READ; | |
967 | if (file->f_mode & FMODE_WRITE) | |
968 | may |= MAY_WRITE; | |
969 | ||
970 | return smk_curacc(file->f_security, may); | |
971 | } | |
972 | ||
973 | /* | |
974 | * Task hooks | |
975 | */ | |
976 | ||
977 | /** | |
f1752eec DH |
978 | * smack_cred_alloc_security - "allocate" a task cred blob |
979 | * @cred: the task creds in need of a blob | |
e114e473 CS |
980 | * |
981 | * Smack isn't using copies of blobs. Everyone | |
982 | * points to an immutable list. No alloc required. | |
983 | * No data copy required. | |
984 | * | |
985 | * Always returns 0 | |
986 | */ | |
f1752eec | 987 | static int smack_cred_alloc_security(struct cred *cred) |
e114e473 | 988 | { |
86a264ab | 989 | cred->security = current_security(); |
e114e473 CS |
990 | return 0; |
991 | } | |
992 | ||
993 | /** | |
f1752eec DH |
994 | * smack_cred_free - "free" task-level security credentials |
995 | * @cred: the credentials in question | |
e114e473 CS |
996 | * |
997 | * Smack isn't using copies of blobs. Everyone | |
998 | * points to an immutable list. The blobs never go away. | |
999 | * There is no leak here. | |
1000 | */ | |
f1752eec | 1001 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1002 | { |
f1752eec | 1003 | cred->security = NULL; |
e114e473 CS |
1004 | } |
1005 | ||
1006 | /** | |
1007 | * smack_task_setpgid - Smack check on setting pgid | |
1008 | * @p: the task object | |
1009 | * @pgid: unused | |
1010 | * | |
1011 | * Return 0 if write access is permitted | |
1012 | */ | |
1013 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1014 | { | |
b6dff3ec | 1015 | return smk_curacc(p->cred->security, MAY_WRITE); |
e114e473 CS |
1016 | } |
1017 | ||
1018 | /** | |
1019 | * smack_task_getpgid - Smack access check for getpgid | |
1020 | * @p: the object task | |
1021 | * | |
1022 | * Returns 0 if current can read the object task, error code otherwise | |
1023 | */ | |
1024 | static int smack_task_getpgid(struct task_struct *p) | |
1025 | { | |
b6dff3ec | 1026 | return smk_curacc(p->cred->security, MAY_READ); |
e114e473 CS |
1027 | } |
1028 | ||
1029 | /** | |
1030 | * smack_task_getsid - Smack access check for getsid | |
1031 | * @p: the object task | |
1032 | * | |
1033 | * Returns 0 if current can read the object task, error code otherwise | |
1034 | */ | |
1035 | static int smack_task_getsid(struct task_struct *p) | |
1036 | { | |
b6dff3ec | 1037 | return smk_curacc(p->cred->security, MAY_READ); |
e114e473 CS |
1038 | } |
1039 | ||
1040 | /** | |
1041 | * smack_task_getsecid - get the secid of the task | |
1042 | * @p: the object task | |
1043 | * @secid: where to put the result | |
1044 | * | |
1045 | * Sets the secid to contain a u32 version of the smack label. | |
1046 | */ | |
1047 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1048 | { | |
b6dff3ec | 1049 | *secid = smack_to_secid(p->cred->security); |
e114e473 CS |
1050 | } |
1051 | ||
1052 | /** | |
1053 | * smack_task_setnice - Smack check on setting nice | |
1054 | * @p: the task object | |
1055 | * @nice: unused | |
1056 | * | |
1057 | * Return 0 if write access is permitted | |
1058 | */ | |
1059 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1060 | { | |
bcdca225 CS |
1061 | int rc; |
1062 | ||
1063 | rc = cap_task_setnice(p, nice); | |
1064 | if (rc == 0) | |
b6dff3ec | 1065 | rc = smk_curacc(p->cred->security, MAY_WRITE); |
bcdca225 | 1066 | return rc; |
e114e473 CS |
1067 | } |
1068 | ||
1069 | /** | |
1070 | * smack_task_setioprio - Smack check on setting ioprio | |
1071 | * @p: the task object | |
1072 | * @ioprio: unused | |
1073 | * | |
1074 | * Return 0 if write access is permitted | |
1075 | */ | |
1076 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1077 | { | |
bcdca225 CS |
1078 | int rc; |
1079 | ||
1080 | rc = cap_task_setioprio(p, ioprio); | |
1081 | if (rc == 0) | |
b6dff3ec | 1082 | rc = smk_curacc(p->cred->security, MAY_WRITE); |
bcdca225 | 1083 | return rc; |
e114e473 CS |
1084 | } |
1085 | ||
1086 | /** | |
1087 | * smack_task_getioprio - Smack check on reading ioprio | |
1088 | * @p: the task object | |
1089 | * | |
1090 | * Return 0 if read access is permitted | |
1091 | */ | |
1092 | static int smack_task_getioprio(struct task_struct *p) | |
1093 | { | |
b6dff3ec | 1094 | return smk_curacc(p->cred->security, MAY_READ); |
e114e473 CS |
1095 | } |
1096 | ||
1097 | /** | |
1098 | * smack_task_setscheduler - Smack check on setting scheduler | |
1099 | * @p: the task object | |
1100 | * @policy: unused | |
1101 | * @lp: unused | |
1102 | * | |
1103 | * Return 0 if read access is permitted | |
1104 | */ | |
1105 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1106 | struct sched_param *lp) | |
1107 | { | |
bcdca225 CS |
1108 | int rc; |
1109 | ||
1110 | rc = cap_task_setscheduler(p, policy, lp); | |
1111 | if (rc == 0) | |
b6dff3ec | 1112 | rc = smk_curacc(p->cred->security, MAY_WRITE); |
bcdca225 | 1113 | return rc; |
e114e473 CS |
1114 | } |
1115 | ||
1116 | /** | |
1117 | * smack_task_getscheduler - Smack check on reading scheduler | |
1118 | * @p: the task object | |
1119 | * | |
1120 | * Return 0 if read access is permitted | |
1121 | */ | |
1122 | static int smack_task_getscheduler(struct task_struct *p) | |
1123 | { | |
b6dff3ec | 1124 | return smk_curacc(p->cred->security, MAY_READ); |
e114e473 CS |
1125 | } |
1126 | ||
1127 | /** | |
1128 | * smack_task_movememory - Smack check on moving memory | |
1129 | * @p: the task object | |
1130 | * | |
1131 | * Return 0 if write access is permitted | |
1132 | */ | |
1133 | static int smack_task_movememory(struct task_struct *p) | |
1134 | { | |
b6dff3ec | 1135 | return smk_curacc(p->cred->security, MAY_WRITE); |
e114e473 CS |
1136 | } |
1137 | ||
1138 | /** | |
1139 | * smack_task_kill - Smack check on signal delivery | |
1140 | * @p: the task object | |
1141 | * @info: unused | |
1142 | * @sig: unused | |
1143 | * @secid: identifies the smack to use in lieu of current's | |
1144 | * | |
1145 | * Return 0 if write access is permitted | |
1146 | * | |
1147 | * The secid behavior is an artifact of an SELinux hack | |
1148 | * in the USB code. Someday it may go away. | |
1149 | */ | |
1150 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1151 | int sig, u32 secid) | |
1152 | { | |
e114e473 CS |
1153 | /* |
1154 | * Sending a signal requires that the sender | |
1155 | * can write the receiver. | |
1156 | */ | |
1157 | if (secid == 0) | |
b6dff3ec | 1158 | return smk_curacc(p->cred->security, MAY_WRITE); |
e114e473 CS |
1159 | /* |
1160 | * If the secid isn't 0 we're dealing with some USB IO | |
1161 | * specific behavior. This is not clean. For one thing | |
1162 | * we can't take privilege into account. | |
1163 | */ | |
b6dff3ec | 1164 | return smk_access(smack_from_secid(secid), p->cred->security, MAY_WRITE); |
e114e473 CS |
1165 | } |
1166 | ||
1167 | /** | |
1168 | * smack_task_wait - Smack access check for waiting | |
1169 | * @p: task to wait for | |
1170 | * | |
1171 | * Returns 0 if current can wait for p, error code otherwise | |
1172 | */ | |
1173 | static int smack_task_wait(struct task_struct *p) | |
1174 | { | |
1175 | int rc; | |
1176 | ||
b6dff3ec | 1177 | rc = smk_access(current->cred->security, p->cred->security, MAY_WRITE); |
e114e473 CS |
1178 | if (rc == 0) |
1179 | return 0; | |
1180 | ||
1181 | /* | |
1182 | * Allow the operation to succeed if either task | |
1183 | * has privilege to perform operations that might | |
1184 | * account for the smack labels having gotten to | |
1185 | * be different in the first place. | |
1186 | * | |
5cd9c58f | 1187 | * This breaks the strict subject/object access |
e114e473 CS |
1188 | * control ideal, taking the object's privilege |
1189 | * state into account in the decision as well as | |
1190 | * the smack value. | |
1191 | */ | |
5cd9c58f | 1192 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
e114e473 CS |
1193 | return 0; |
1194 | ||
1195 | return rc; | |
1196 | } | |
1197 | ||
1198 | /** | |
1199 | * smack_task_to_inode - copy task smack into the inode blob | |
1200 | * @p: task to copy from | |
1201 | * inode: inode to copy to | |
1202 | * | |
1203 | * Sets the smack pointer in the inode security blob | |
1204 | */ | |
1205 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1206 | { | |
1207 | struct inode_smack *isp = inode->i_security; | |
b6dff3ec | 1208 | isp->smk_inode = p->cred->security; |
e114e473 CS |
1209 | } |
1210 | ||
1211 | /* | |
1212 | * Socket hooks. | |
1213 | */ | |
1214 | ||
1215 | /** | |
1216 | * smack_sk_alloc_security - Allocate a socket blob | |
1217 | * @sk: the socket | |
1218 | * @family: unused | |
1219 | * @priority: memory allocation priority | |
1220 | * | |
1221 | * Assign Smack pointers to current | |
1222 | * | |
1223 | * Returns 0 on success, -ENOMEM is there's no memory | |
1224 | */ | |
1225 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1226 | { | |
86a264ab | 1227 | char *csp = current_security(); |
e114e473 CS |
1228 | struct socket_smack *ssp; |
1229 | ||
1230 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1231 | if (ssp == NULL) | |
1232 | return -ENOMEM; | |
1233 | ||
1234 | ssp->smk_in = csp; | |
1235 | ssp->smk_out = csp; | |
1236 | ssp->smk_packet[0] = '\0'; | |
1237 | ||
1238 | sk->sk_security = ssp; | |
1239 | ||
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | /** | |
1244 | * smack_sk_free_security - Free a socket blob | |
1245 | * @sk: the socket | |
1246 | * | |
1247 | * Clears the blob pointer | |
1248 | */ | |
1249 | static void smack_sk_free_security(struct sock *sk) | |
1250 | { | |
1251 | kfree(sk->sk_security); | |
1252 | } | |
1253 | ||
1254 | /** | |
1255 | * smack_set_catset - convert a capset to netlabel mls categories | |
1256 | * @catset: the Smack categories | |
1257 | * @sap: where to put the netlabel categories | |
1258 | * | |
1259 | * Allocates and fills attr.mls.cat | |
1260 | */ | |
1261 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1262 | { | |
1263 | unsigned char *cp; | |
1264 | unsigned char m; | |
1265 | int cat; | |
1266 | int rc; | |
1267 | int byte; | |
1268 | ||
c60264c4 | 1269 | if (!catset) |
e114e473 CS |
1270 | return; |
1271 | ||
1272 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1273 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1274 | sap->attr.mls.cat->startbit = 0; | |
1275 | ||
1276 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1277 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1278 | if ((m & *cp) == 0) | |
1279 | continue; | |
1280 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1281 | cat, GFP_ATOMIC); | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * smack_to_secattr - fill a secattr from a smack value | |
1287 | * @smack: the smack value | |
1288 | * @nlsp: where the result goes | |
1289 | * | |
1290 | * Casey says that CIPSO is good enough for now. | |
1291 | * It can be used to effect. | |
1292 | * It can also be abused to effect when necessary. | |
1293 | * Appologies to the TSIG group in general and GW in particular. | |
1294 | */ | |
1295 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1296 | { | |
1297 | struct smack_cipso cipso; | |
1298 | int rc; | |
1299 | ||
1300 | switch (smack_net_nltype) { | |
1301 | case NETLBL_NLTYPE_CIPSOV4: | |
00447872 | 1302 | nlsp->domain = smack; |
4bc87e62 | 1303 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; |
e114e473 CS |
1304 | |
1305 | rc = smack_to_cipso(smack, &cipso); | |
1306 | if (rc == 0) { | |
1307 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1308 | smack_set_catset(cipso.smk_catset, nlsp); | |
1309 | } else { | |
1310 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1311 | smack_set_catset(smack, nlsp); | |
1312 | } | |
1313 | break; | |
1314 | default: | |
1315 | break; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * smack_netlabel - Set the secattr on a socket | |
1321 | * @sk: the socket | |
1322 | * | |
1323 | * Convert the outbound smack value (smk_out) to a | |
1324 | * secattr and attach it to the socket. | |
1325 | * | |
1326 | * Returns 0 on success or an error code | |
1327 | */ | |
1328 | static int smack_netlabel(struct sock *sk) | |
1329 | { | |
2e1d146a | 1330 | struct socket_smack *ssp; |
e114e473 | 1331 | struct netlbl_lsm_secattr secattr; |
4bc87e62 | 1332 | int rc; |
e114e473 | 1333 | |
2e1d146a | 1334 | ssp = sk->sk_security; |
e114e473 CS |
1335 | netlbl_secattr_init(&secattr); |
1336 | smack_to_secattr(ssp->smk_out, &secattr); | |
4bc87e62 | 1337 | rc = netlbl_sock_setattr(sk, &secattr); |
e114e473 | 1338 | netlbl_secattr_destroy(&secattr); |
4bc87e62 | 1339 | |
e114e473 CS |
1340 | return rc; |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * smack_inode_setsecurity - set smack xattrs | |
1345 | * @inode: the object | |
1346 | * @name: attribute name | |
1347 | * @value: attribute value | |
1348 | * @size: size of the attribute | |
1349 | * @flags: unused | |
1350 | * | |
1351 | * Sets the named attribute in the appropriate blob | |
1352 | * | |
1353 | * Returns 0 on success, or an error code | |
1354 | */ | |
1355 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1356 | const void *value, size_t size, int flags) | |
1357 | { | |
1358 | char *sp; | |
1359 | struct inode_smack *nsp = inode->i_security; | |
1360 | struct socket_smack *ssp; | |
1361 | struct socket *sock; | |
4bc87e62 | 1362 | int rc = 0; |
e114e473 CS |
1363 | |
1364 | if (value == NULL || size > SMK_LABELLEN) | |
1365 | return -EACCES; | |
1366 | ||
1367 | sp = smk_import(value, size); | |
1368 | if (sp == NULL) | |
1369 | return -EINVAL; | |
1370 | ||
1371 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1372 | nsp->smk_inode = sp; | |
1373 | return 0; | |
1374 | } | |
1375 | /* | |
1376 | * The rest of the Smack xattrs are only on sockets. | |
1377 | */ | |
1378 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1379 | return -EOPNOTSUPP; | |
1380 | ||
1381 | sock = SOCKET_I(inode); | |
2e1d146a | 1382 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1383 | return -EOPNOTSUPP; |
1384 | ||
1385 | ssp = sock->sk->sk_security; | |
1386 | ||
1387 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1388 | ssp->smk_in = sp; | |
1389 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1390 | ssp->smk_out = sp; | |
4bc87e62 CS |
1391 | rc = smack_netlabel(sock->sk); |
1392 | if (rc != 0) | |
1393 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1394 | __func__, -rc); | |
e114e473 CS |
1395 | } else |
1396 | return -EOPNOTSUPP; | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * smack_socket_post_create - finish socket setup | |
1403 | * @sock: the socket | |
1404 | * @family: protocol family | |
1405 | * @type: unused | |
1406 | * @protocol: unused | |
1407 | * @kern: unused | |
1408 | * | |
1409 | * Sets the netlabel information on the socket | |
1410 | * | |
1411 | * Returns 0 on success, and error code otherwise | |
1412 | */ | |
1413 | static int smack_socket_post_create(struct socket *sock, int family, | |
1414 | int type, int protocol, int kern) | |
1415 | { | |
2e1d146a | 1416 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1417 | return 0; |
1418 | /* | |
1419 | * Set the outbound netlbl. | |
1420 | */ | |
1421 | return smack_netlabel(sock->sk); | |
1422 | } | |
1423 | ||
1424 | /** | |
1425 | * smack_flags_to_may - convert S_ to MAY_ values | |
1426 | * @flags: the S_ value | |
1427 | * | |
1428 | * Returns the equivalent MAY_ value | |
1429 | */ | |
1430 | static int smack_flags_to_may(int flags) | |
1431 | { | |
1432 | int may = 0; | |
1433 | ||
1434 | if (flags & S_IRUGO) | |
1435 | may |= MAY_READ; | |
1436 | if (flags & S_IWUGO) | |
1437 | may |= MAY_WRITE; | |
1438 | if (flags & S_IXUGO) | |
1439 | may |= MAY_EXEC; | |
1440 | ||
1441 | return may; | |
1442 | } | |
1443 | ||
1444 | /** | |
1445 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1446 | * @msg: the object | |
1447 | * | |
1448 | * Returns 0 | |
1449 | */ | |
1450 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1451 | { | |
86a264ab | 1452 | msg->security = current_security(); |
e114e473 CS |
1453 | return 0; |
1454 | } | |
1455 | ||
1456 | /** | |
1457 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1458 | * @msg: the object | |
1459 | * | |
1460 | * Clears the blob pointer | |
1461 | */ | |
1462 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1463 | { | |
1464 | msg->security = NULL; | |
1465 | } | |
1466 | ||
1467 | /** | |
1468 | * smack_of_shm - the smack pointer for the shm | |
1469 | * @shp: the object | |
1470 | * | |
1471 | * Returns a pointer to the smack value | |
1472 | */ | |
1473 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1474 | { | |
1475 | return (char *)shp->shm_perm.security; | |
1476 | } | |
1477 | ||
1478 | /** | |
1479 | * smack_shm_alloc_security - Set the security blob for shm | |
1480 | * @shp: the object | |
1481 | * | |
1482 | * Returns 0 | |
1483 | */ | |
1484 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1485 | { | |
1486 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1487 | ||
86a264ab | 1488 | isp->security = current_security(); |
e114e473 CS |
1489 | return 0; |
1490 | } | |
1491 | ||
1492 | /** | |
1493 | * smack_shm_free_security - Clear the security blob for shm | |
1494 | * @shp: the object | |
1495 | * | |
1496 | * Clears the blob pointer | |
1497 | */ | |
1498 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1499 | { | |
1500 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1501 | ||
1502 | isp->security = NULL; | |
1503 | } | |
1504 | ||
1505 | /** | |
1506 | * smack_shm_associate - Smack access check for shm | |
1507 | * @shp: the object | |
1508 | * @shmflg: access requested | |
1509 | * | |
1510 | * Returns 0 if current has the requested access, error code otherwise | |
1511 | */ | |
1512 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1513 | { | |
1514 | char *ssp = smack_of_shm(shp); | |
1515 | int may; | |
1516 | ||
1517 | may = smack_flags_to_may(shmflg); | |
1518 | return smk_curacc(ssp, may); | |
1519 | } | |
1520 | ||
1521 | /** | |
1522 | * smack_shm_shmctl - Smack access check for shm | |
1523 | * @shp: the object | |
1524 | * @cmd: what it wants to do | |
1525 | * | |
1526 | * Returns 0 if current has the requested access, error code otherwise | |
1527 | */ | |
1528 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1529 | { | |
1d252fb8 | 1530 | char *ssp; |
e114e473 CS |
1531 | int may; |
1532 | ||
1533 | switch (cmd) { | |
1534 | case IPC_STAT: | |
1535 | case SHM_STAT: | |
1536 | may = MAY_READ; | |
1537 | break; | |
1538 | case IPC_SET: | |
1539 | case SHM_LOCK: | |
1540 | case SHM_UNLOCK: | |
1541 | case IPC_RMID: | |
1542 | may = MAY_READWRITE; | |
1543 | break; | |
1544 | case IPC_INFO: | |
1545 | case SHM_INFO: | |
1546 | /* | |
1547 | * System level information. | |
1548 | */ | |
1549 | return 0; | |
1550 | default: | |
1551 | return -EINVAL; | |
1552 | } | |
1553 | ||
1d252fb8 | 1554 | ssp = smack_of_shm(shp); |
e114e473 CS |
1555 | return smk_curacc(ssp, may); |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * smack_shm_shmat - Smack access for shmat | |
1560 | * @shp: the object | |
1561 | * @shmaddr: unused | |
1562 | * @shmflg: access requested | |
1563 | * | |
1564 | * Returns 0 if current has the requested access, error code otherwise | |
1565 | */ | |
1566 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1567 | int shmflg) | |
1568 | { | |
1569 | char *ssp = smack_of_shm(shp); | |
1570 | int may; | |
1571 | ||
1572 | may = smack_flags_to_may(shmflg); | |
1573 | return smk_curacc(ssp, may); | |
1574 | } | |
1575 | ||
1576 | /** | |
1577 | * smack_of_sem - the smack pointer for the sem | |
1578 | * @sma: the object | |
1579 | * | |
1580 | * Returns a pointer to the smack value | |
1581 | */ | |
1582 | static char *smack_of_sem(struct sem_array *sma) | |
1583 | { | |
1584 | return (char *)sma->sem_perm.security; | |
1585 | } | |
1586 | ||
1587 | /** | |
1588 | * smack_sem_alloc_security - Set the security blob for sem | |
1589 | * @sma: the object | |
1590 | * | |
1591 | * Returns 0 | |
1592 | */ | |
1593 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1594 | { | |
1595 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1596 | ||
86a264ab | 1597 | isp->security = current_security(); |
e114e473 CS |
1598 | return 0; |
1599 | } | |
1600 | ||
1601 | /** | |
1602 | * smack_sem_free_security - Clear the security blob for sem | |
1603 | * @sma: the object | |
1604 | * | |
1605 | * Clears the blob pointer | |
1606 | */ | |
1607 | static void smack_sem_free_security(struct sem_array *sma) | |
1608 | { | |
1609 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1610 | ||
1611 | isp->security = NULL; | |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * smack_sem_associate - Smack access check for sem | |
1616 | * @sma: the object | |
1617 | * @semflg: access requested | |
1618 | * | |
1619 | * Returns 0 if current has the requested access, error code otherwise | |
1620 | */ | |
1621 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1622 | { | |
1623 | char *ssp = smack_of_sem(sma); | |
1624 | int may; | |
1625 | ||
1626 | may = smack_flags_to_may(semflg); | |
1627 | return smk_curacc(ssp, may); | |
1628 | } | |
1629 | ||
1630 | /** | |
1631 | * smack_sem_shmctl - Smack access check for sem | |
1632 | * @sma: the object | |
1633 | * @cmd: what it wants to do | |
1634 | * | |
1635 | * Returns 0 if current has the requested access, error code otherwise | |
1636 | */ | |
1637 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1638 | { | |
1d252fb8 | 1639 | char *ssp; |
e114e473 CS |
1640 | int may; |
1641 | ||
1642 | switch (cmd) { | |
1643 | case GETPID: | |
1644 | case GETNCNT: | |
1645 | case GETZCNT: | |
1646 | case GETVAL: | |
1647 | case GETALL: | |
1648 | case IPC_STAT: | |
1649 | case SEM_STAT: | |
1650 | may = MAY_READ; | |
1651 | break; | |
1652 | case SETVAL: | |
1653 | case SETALL: | |
1654 | case IPC_RMID: | |
1655 | case IPC_SET: | |
1656 | may = MAY_READWRITE; | |
1657 | break; | |
1658 | case IPC_INFO: | |
1659 | case SEM_INFO: | |
1660 | /* | |
1661 | * System level information | |
1662 | */ | |
1663 | return 0; | |
1664 | default: | |
1665 | return -EINVAL; | |
1666 | } | |
1667 | ||
1d252fb8 | 1668 | ssp = smack_of_sem(sma); |
e114e473 CS |
1669 | return smk_curacc(ssp, may); |
1670 | } | |
1671 | ||
1672 | /** | |
1673 | * smack_sem_semop - Smack checks of semaphore operations | |
1674 | * @sma: the object | |
1675 | * @sops: unused | |
1676 | * @nsops: unused | |
1677 | * @alter: unused | |
1678 | * | |
1679 | * Treated as read and write in all cases. | |
1680 | * | |
1681 | * Returns 0 if access is allowed, error code otherwise | |
1682 | */ | |
1683 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
1684 | unsigned nsops, int alter) | |
1685 | { | |
1686 | char *ssp = smack_of_sem(sma); | |
1687 | ||
1688 | return smk_curacc(ssp, MAY_READWRITE); | |
1689 | } | |
1690 | ||
1691 | /** | |
1692 | * smack_msg_alloc_security - Set the security blob for msg | |
1693 | * @msq: the object | |
1694 | * | |
1695 | * Returns 0 | |
1696 | */ | |
1697 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
1698 | { | |
1699 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1700 | ||
86a264ab | 1701 | kisp->security = current_security(); |
e114e473 CS |
1702 | return 0; |
1703 | } | |
1704 | ||
1705 | /** | |
1706 | * smack_msg_free_security - Clear the security blob for msg | |
1707 | * @msq: the object | |
1708 | * | |
1709 | * Clears the blob pointer | |
1710 | */ | |
1711 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
1712 | { | |
1713 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1714 | ||
1715 | kisp->security = NULL; | |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * smack_of_msq - the smack pointer for the msq | |
1720 | * @msq: the object | |
1721 | * | |
1722 | * Returns a pointer to the smack value | |
1723 | */ | |
1724 | static char *smack_of_msq(struct msg_queue *msq) | |
1725 | { | |
1726 | return (char *)msq->q_perm.security; | |
1727 | } | |
1728 | ||
1729 | /** | |
1730 | * smack_msg_queue_associate - Smack access check for msg_queue | |
1731 | * @msq: the object | |
1732 | * @msqflg: access requested | |
1733 | * | |
1734 | * Returns 0 if current has the requested access, error code otherwise | |
1735 | */ | |
1736 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
1737 | { | |
1738 | char *msp = smack_of_msq(msq); | |
1739 | int may; | |
1740 | ||
1741 | may = smack_flags_to_may(msqflg); | |
1742 | return smk_curacc(msp, may); | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
1747 | * @msq: the object | |
1748 | * @cmd: what it wants to do | |
1749 | * | |
1750 | * Returns 0 if current has the requested access, error code otherwise | |
1751 | */ | |
1752 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
1753 | { | |
1d252fb8 | 1754 | char *msp; |
e114e473 CS |
1755 | int may; |
1756 | ||
1757 | switch (cmd) { | |
1758 | case IPC_STAT: | |
1759 | case MSG_STAT: | |
1760 | may = MAY_READ; | |
1761 | break; | |
1762 | case IPC_SET: | |
1763 | case IPC_RMID: | |
1764 | may = MAY_READWRITE; | |
1765 | break; | |
1766 | case IPC_INFO: | |
1767 | case MSG_INFO: | |
1768 | /* | |
1769 | * System level information | |
1770 | */ | |
1771 | return 0; | |
1772 | default: | |
1773 | return -EINVAL; | |
1774 | } | |
1775 | ||
1d252fb8 | 1776 | msp = smack_of_msq(msq); |
e114e473 CS |
1777 | return smk_curacc(msp, may); |
1778 | } | |
1779 | ||
1780 | /** | |
1781 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1782 | * @msq: the object | |
1783 | * @msg: unused | |
1784 | * @msqflg: access requested | |
1785 | * | |
1786 | * Returns 0 if current has the requested access, error code otherwise | |
1787 | */ | |
1788 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
1789 | int msqflg) | |
1790 | { | |
1791 | char *msp = smack_of_msq(msq); | |
1792 | int rc; | |
1793 | ||
1794 | rc = smack_flags_to_may(msqflg); | |
1795 | return smk_curacc(msp, rc); | |
1796 | } | |
1797 | ||
1798 | /** | |
1799 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1800 | * @msq: the object | |
1801 | * @msg: unused | |
1802 | * @target: unused | |
1803 | * @type: unused | |
1804 | * @mode: unused | |
1805 | * | |
1806 | * Returns 0 if current has read and write access, error code otherwise | |
1807 | */ | |
1808 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
1809 | struct task_struct *target, long type, int mode) | |
1810 | { | |
1811 | char *msp = smack_of_msq(msq); | |
1812 | ||
1813 | return smk_curacc(msp, MAY_READWRITE); | |
1814 | } | |
1815 | ||
1816 | /** | |
1817 | * smack_ipc_permission - Smack access for ipc_permission() | |
1818 | * @ipp: the object permissions | |
1819 | * @flag: access requested | |
1820 | * | |
1821 | * Returns 0 if current has read and write access, error code otherwise | |
1822 | */ | |
1823 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
1824 | { | |
1825 | char *isp = ipp->security; | |
1826 | int may; | |
1827 | ||
1828 | may = smack_flags_to_may(flag); | |
1829 | return smk_curacc(isp, may); | |
1830 | } | |
1831 | ||
d20bdda6 AD |
1832 | /** |
1833 | * smack_ipc_getsecid - Extract smack security id | |
1834 | * @ipcp: the object permissions | |
1835 | * @secid: where result will be saved | |
1836 | */ | |
1837 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
1838 | { | |
1839 | char *smack = ipp->security; | |
1840 | ||
1841 | *secid = smack_to_secid(smack); | |
1842 | } | |
1843 | ||
e114e473 CS |
1844 | /** |
1845 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
1846 | * @opt_dentry: unused | |
1847 | * @inode: the object | |
1848 | * | |
1849 | * Set the inode's security blob if it hasn't been done already. | |
1850 | */ | |
1851 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
1852 | { | |
1853 | struct super_block *sbp; | |
1854 | struct superblock_smack *sbsp; | |
1855 | struct inode_smack *isp; | |
86a264ab | 1856 | char *csp = current_security(); |
e114e473 CS |
1857 | char *fetched; |
1858 | char *final; | |
1859 | struct dentry *dp; | |
1860 | ||
1861 | if (inode == NULL) | |
1862 | return; | |
1863 | ||
1864 | isp = inode->i_security; | |
1865 | ||
1866 | mutex_lock(&isp->smk_lock); | |
1867 | /* | |
1868 | * If the inode is already instantiated | |
1869 | * take the quick way out | |
1870 | */ | |
1871 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
1872 | goto unlockandout; | |
1873 | ||
1874 | sbp = inode->i_sb; | |
1875 | sbsp = sbp->s_security; | |
1876 | /* | |
1877 | * We're going to use the superblock default label | |
1878 | * if there's no label on the file. | |
1879 | */ | |
1880 | final = sbsp->smk_default; | |
1881 | ||
e97dcb0e CS |
1882 | /* |
1883 | * If this is the root inode the superblock | |
1884 | * may be in the process of initialization. | |
1885 | * If that is the case use the root value out | |
1886 | * of the superblock. | |
1887 | */ | |
1888 | if (opt_dentry->d_parent == opt_dentry) { | |
1889 | isp->smk_inode = sbsp->smk_root; | |
1890 | isp->smk_flags |= SMK_INODE_INSTANT; | |
1891 | goto unlockandout; | |
1892 | } | |
1893 | ||
e114e473 CS |
1894 | /* |
1895 | * This is pretty hackish. | |
1896 | * Casey says that we shouldn't have to do | |
1897 | * file system specific code, but it does help | |
1898 | * with keeping it simple. | |
1899 | */ | |
1900 | switch (sbp->s_magic) { | |
1901 | case SMACK_MAGIC: | |
1902 | /* | |
1903 | * Casey says that it's a little embarassing | |
1904 | * that the smack file system doesn't do | |
1905 | * extended attributes. | |
1906 | */ | |
1907 | final = smack_known_star.smk_known; | |
1908 | break; | |
1909 | case PIPEFS_MAGIC: | |
1910 | /* | |
1911 | * Casey says pipes are easy (?) | |
1912 | */ | |
1913 | final = smack_known_star.smk_known; | |
1914 | break; | |
1915 | case DEVPTS_SUPER_MAGIC: | |
1916 | /* | |
1917 | * devpts seems content with the label of the task. | |
1918 | * Programs that change smack have to treat the | |
1919 | * pty with respect. | |
1920 | */ | |
1921 | final = csp; | |
1922 | break; | |
1923 | case SOCKFS_MAGIC: | |
1924 | /* | |
1925 | * Casey says sockets get the smack of the task. | |
1926 | */ | |
1927 | final = csp; | |
1928 | break; | |
1929 | case PROC_SUPER_MAGIC: | |
1930 | /* | |
1931 | * Casey says procfs appears not to care. | |
1932 | * The superblock default suffices. | |
1933 | */ | |
1934 | break; | |
1935 | case TMPFS_MAGIC: | |
1936 | /* | |
1937 | * Device labels should come from the filesystem, | |
1938 | * but watch out, because they're volitile, | |
1939 | * getting recreated on every reboot. | |
1940 | */ | |
1941 | final = smack_known_star.smk_known; | |
1942 | /* | |
1943 | * No break. | |
1944 | * | |
1945 | * If a smack value has been set we want to use it, | |
1946 | * but since tmpfs isn't giving us the opportunity | |
1947 | * to set mount options simulate setting the | |
1948 | * superblock default. | |
1949 | */ | |
1950 | default: | |
1951 | /* | |
1952 | * This isn't an understood special case. | |
1953 | * Get the value from the xattr. | |
1954 | * | |
1955 | * No xattr support means, alas, no SMACK label. | |
1956 | * Use the aforeapplied default. | |
1957 | * It would be curious if the label of the task | |
1958 | * does not match that assigned. | |
1959 | */ | |
1960 | if (inode->i_op->getxattr == NULL) | |
1961 | break; | |
1962 | /* | |
1963 | * Get the dentry for xattr. | |
1964 | */ | |
1965 | if (opt_dentry == NULL) { | |
1966 | dp = d_find_alias(inode); | |
1967 | if (dp == NULL) | |
1968 | break; | |
1969 | } else { | |
1970 | dp = dget(opt_dentry); | |
1971 | if (dp == NULL) | |
1972 | break; | |
1973 | } | |
1974 | ||
1975 | fetched = smk_fetch(inode, dp); | |
1976 | if (fetched != NULL) | |
1977 | final = fetched; | |
1978 | ||
1979 | dput(dp); | |
1980 | break; | |
1981 | } | |
1982 | ||
1983 | if (final == NULL) | |
1984 | isp->smk_inode = csp; | |
1985 | else | |
1986 | isp->smk_inode = final; | |
1987 | ||
1988 | isp->smk_flags |= SMK_INODE_INSTANT; | |
1989 | ||
1990 | unlockandout: | |
1991 | mutex_unlock(&isp->smk_lock); | |
1992 | return; | |
1993 | } | |
1994 | ||
1995 | /** | |
1996 | * smack_getprocattr - Smack process attribute access | |
1997 | * @p: the object task | |
1998 | * @name: the name of the attribute in /proc/.../attr | |
1999 | * @value: where to put the result | |
2000 | * | |
2001 | * Places a copy of the task Smack into value | |
2002 | * | |
2003 | * Returns the length of the smack label or an error code | |
2004 | */ | |
2005 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2006 | { | |
2007 | char *cp; | |
2008 | int slen; | |
2009 | ||
2010 | if (strcmp(name, "current") != 0) | |
2011 | return -EINVAL; | |
2012 | ||
b6dff3ec | 2013 | cp = kstrdup(p->cred->security, GFP_KERNEL); |
e114e473 CS |
2014 | if (cp == NULL) |
2015 | return -ENOMEM; | |
2016 | ||
2017 | slen = strlen(cp); | |
2018 | *value = cp; | |
2019 | return slen; | |
2020 | } | |
2021 | ||
2022 | /** | |
2023 | * smack_setprocattr - Smack process attribute setting | |
2024 | * @p: the object task | |
2025 | * @name: the name of the attribute in /proc/.../attr | |
2026 | * @value: the value to set | |
2027 | * @size: the size of the value | |
2028 | * | |
2029 | * Sets the Smack value of the task. Only setting self | |
2030 | * is permitted and only with privilege | |
2031 | * | |
2032 | * Returns the length of the smack label or an error code | |
2033 | */ | |
2034 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2035 | void *value, size_t size) | |
2036 | { | |
2037 | char *newsmack; | |
2038 | ||
e114e473 CS |
2039 | /* |
2040 | * Changing another process' Smack value is too dangerous | |
2041 | * and supports no sane use case. | |
2042 | */ | |
2043 | if (p != current) | |
2044 | return -EPERM; | |
2045 | ||
5cd9c58f DH |
2046 | if (!capable(CAP_MAC_ADMIN)) |
2047 | return -EPERM; | |
2048 | ||
e114e473 CS |
2049 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2050 | return -EINVAL; | |
2051 | ||
2052 | if (strcmp(name, "current") != 0) | |
2053 | return -EINVAL; | |
2054 | ||
2055 | newsmack = smk_import(value, size); | |
2056 | if (newsmack == NULL) | |
2057 | return -EINVAL; | |
2058 | ||
b6dff3ec | 2059 | p->cred->security = newsmack; |
e114e473 CS |
2060 | return size; |
2061 | } | |
2062 | ||
2063 | /** | |
2064 | * smack_unix_stream_connect - Smack access on UDS | |
2065 | * @sock: one socket | |
2066 | * @other: the other socket | |
2067 | * @newsk: unused | |
2068 | * | |
2069 | * Return 0 if a subject with the smack of sock could access | |
2070 | * an object with the smack of other, otherwise an error code | |
2071 | */ | |
2072 | static int smack_unix_stream_connect(struct socket *sock, | |
2073 | struct socket *other, struct sock *newsk) | |
2074 | { | |
2075 | struct inode *sp = SOCK_INODE(sock); | |
2076 | struct inode *op = SOCK_INODE(other); | |
2077 | ||
2078 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE); | |
2079 | } | |
2080 | ||
2081 | /** | |
2082 | * smack_unix_may_send - Smack access on UDS | |
2083 | * @sock: one socket | |
2084 | * @other: the other socket | |
2085 | * | |
2086 | * Return 0 if a subject with the smack of sock could access | |
2087 | * an object with the smack of other, otherwise an error code | |
2088 | */ | |
2089 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2090 | { | |
2091 | struct inode *sp = SOCK_INODE(sock); | |
2092 | struct inode *op = SOCK_INODE(other); | |
2093 | ||
2094 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE); | |
2095 | } | |
2096 | ||
2097 | /** | |
2098 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat | |
2099 | * pair to smack | |
2100 | * @sap: netlabel secattr | |
2101 | * @sip: where to put the result | |
2102 | * | |
2103 | * Copies a smack label into sip | |
2104 | */ | |
2105 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2106 | { | |
2107 | char smack[SMK_LABELLEN]; | |
2108 | int pcat; | |
2109 | ||
2110 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) { | |
2111 | /* | |
2112 | * If there are flags but no level netlabel isn't | |
2113 | * behaving the way we expect it to. | |
2114 | * | |
2115 | * Without guidance regarding the smack value | |
2116 | * for the packet fall back on the network | |
2117 | * ambient value. | |
2118 | */ | |
2119 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); | |
2120 | return; | |
2121 | } | |
2122 | /* | |
2123 | * Get the categories, if any | |
2124 | */ | |
2125 | memset(smack, '\0', SMK_LABELLEN); | |
2126 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2127 | for (pcat = -1;;) { | |
2128 | pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat, | |
2129 | pcat + 1); | |
2130 | if (pcat < 0) | |
2131 | break; | |
2132 | smack_catset_bit(pcat, smack); | |
2133 | } | |
2134 | /* | |
2135 | * If it is CIPSO using smack direct mapping | |
2136 | * we are already done. WeeHee. | |
2137 | */ | |
2138 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2139 | memcpy(sip, smack, SMK_MAXLEN); | |
2140 | return; | |
2141 | } | |
2142 | /* | |
2143 | * Look it up in the supplied table if it is not a direct mapping. | |
2144 | */ | |
2145 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
2146 | return; | |
2147 | } | |
2148 | ||
2149 | /** | |
2150 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2151 | * @sk: socket | |
2152 | * @skb: packet | |
2153 | * | |
2154 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2155 | */ | |
2156 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2157 | { | |
2158 | struct netlbl_lsm_secattr secattr; | |
2159 | struct socket_smack *ssp = sk->sk_security; | |
2160 | char smack[SMK_LABELLEN]; | |
2161 | int rc; | |
2162 | ||
2163 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2164 | return 0; | |
2165 | ||
2166 | /* | |
2167 | * Translate what netlabel gave us. | |
2168 | */ | |
2169 | memset(smack, '\0', SMK_LABELLEN); | |
2170 | netlbl_secattr_init(&secattr); | |
2171 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); | |
2172 | if (rc == 0) | |
2173 | smack_from_secattr(&secattr, smack); | |
2174 | else | |
2175 | strncpy(smack, smack_net_ambient, SMK_MAXLEN); | |
2176 | netlbl_secattr_destroy(&secattr); | |
2177 | /* | |
2178 | * Receiving a packet requires that the other end | |
2179 | * be able to write here. Read access is not required. | |
2180 | * This is the simplist possible security model | |
2181 | * for networking. | |
2182 | */ | |
a8134296 PM |
2183 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE); |
2184 | if (rc != 0) | |
2185 | netlbl_skbuff_err(skb, rc, 0); | |
2186 | return rc; | |
e114e473 CS |
2187 | } |
2188 | ||
2189 | /** | |
2190 | * smack_socket_getpeersec_stream - pull in packet label | |
2191 | * @sock: the socket | |
2192 | * @optval: user's destination | |
2193 | * @optlen: size thereof | |
2194 | * @len: max thereoe | |
2195 | * | |
2196 | * returns zero on success, an error code otherwise | |
2197 | */ | |
2198 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2199 | char __user *optval, | |
2200 | int __user *optlen, unsigned len) | |
2201 | { | |
2202 | struct socket_smack *ssp; | |
2203 | int slen; | |
2204 | int rc = 0; | |
2205 | ||
2206 | ssp = sock->sk->sk_security; | |
2207 | slen = strlen(ssp->smk_packet) + 1; | |
2208 | ||
2209 | if (slen > len) | |
2210 | rc = -ERANGE; | |
2211 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2212 | rc = -EFAULT; | |
2213 | ||
2214 | if (put_user(slen, optlen) != 0) | |
2215 | rc = -EFAULT; | |
2216 | ||
2217 | return rc; | |
2218 | } | |
2219 | ||
2220 | ||
2221 | /** | |
2222 | * smack_socket_getpeersec_dgram - pull in packet label | |
2223 | * @sock: the socket | |
2224 | * @skb: packet data | |
2225 | * @secid: pointer to where to put the secid of the packet | |
2226 | * | |
2227 | * Sets the netlabel socket state on sk from parent | |
2228 | */ | |
2229 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2230 | struct sk_buff *skb, u32 *secid) | |
2231 | ||
2232 | { | |
2233 | struct netlbl_lsm_secattr secattr; | |
2234 | struct sock *sk; | |
2235 | char smack[SMK_LABELLEN]; | |
2236 | int family = PF_INET; | |
2237 | u32 s; | |
2238 | int rc; | |
2239 | ||
2240 | /* | |
2241 | * Only works for families with packets. | |
2242 | */ | |
2243 | if (sock != NULL) { | |
2244 | sk = sock->sk; | |
2245 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2246 | return 0; | |
2247 | family = sk->sk_family; | |
2248 | } | |
2249 | /* | |
2250 | * Translate what netlabel gave us. | |
2251 | */ | |
2252 | memset(smack, '\0', SMK_LABELLEN); | |
2253 | netlbl_secattr_init(&secattr); | |
2254 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2255 | if (rc == 0) | |
2256 | smack_from_secattr(&secattr, smack); | |
2257 | netlbl_secattr_destroy(&secattr); | |
2258 | ||
2259 | /* | |
2260 | * Give up if we couldn't get anything | |
2261 | */ | |
2262 | if (rc != 0) | |
2263 | return rc; | |
2264 | ||
2265 | s = smack_to_secid(smack); | |
2266 | if (s == 0) | |
2267 | return -EINVAL; | |
2268 | ||
2269 | *secid = s; | |
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | /** | |
2274 | * smack_sock_graft - graft access state between two sockets | |
2275 | * @sk: fresh sock | |
2276 | * @parent: donor socket | |
2277 | * | |
2278 | * Sets the netlabel socket state on sk from parent | |
2279 | */ | |
2280 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2281 | { | |
2282 | struct socket_smack *ssp; | |
2283 | int rc; | |
2284 | ||
2285 | if (sk == NULL) | |
2286 | return; | |
2287 | ||
2288 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2289 | return; | |
2290 | ||
2291 | ssp = sk->sk_security; | |
86a264ab | 2292 | ssp->smk_in = ssp->smk_out = current_security(); |
e114e473 CS |
2293 | ssp->smk_packet[0] = '\0'; |
2294 | ||
2295 | rc = smack_netlabel(sk); | |
4bc87e62 CS |
2296 | if (rc != 0) |
2297 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
2298 | __func__, -rc); | |
e114e473 CS |
2299 | } |
2300 | ||
2301 | /** | |
2302 | * smack_inet_conn_request - Smack access check on connect | |
2303 | * @sk: socket involved | |
2304 | * @skb: packet | |
2305 | * @req: unused | |
2306 | * | |
2307 | * Returns 0 if a task with the packet label could write to | |
2308 | * the socket, otherwise an error code | |
2309 | */ | |
2310 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2311 | struct request_sock *req) | |
2312 | { | |
2313 | struct netlbl_lsm_secattr skb_secattr; | |
2314 | struct socket_smack *ssp = sk->sk_security; | |
2315 | char smack[SMK_LABELLEN]; | |
2316 | int rc; | |
2317 | ||
2318 | if (skb == NULL) | |
2319 | return -EACCES; | |
2320 | ||
2321 | memset(smack, '\0', SMK_LABELLEN); | |
2322 | netlbl_secattr_init(&skb_secattr); | |
2323 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr); | |
2324 | if (rc == 0) | |
2325 | smack_from_secattr(&skb_secattr, smack); | |
2326 | else | |
2327 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
2328 | netlbl_secattr_destroy(&skb_secattr); | |
2329 | /* | |
2330 | * Receiving a packet requires that the other end | |
2331 | * be able to write here. Read access is not required. | |
2332 | * | |
2333 | * If the request is successful save the peer's label | |
2334 | * so that SO_PEERCRED can report it. | |
2335 | */ | |
2336 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE); | |
2337 | if (rc == 0) | |
2338 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2339 | ||
2340 | return rc; | |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * Key management security hooks | |
2345 | * | |
2346 | * Casey has not tested key support very heavily. | |
2347 | * The permission check is most likely too restrictive. | |
2348 | * If you care about keys please have a look. | |
2349 | */ | |
2350 | #ifdef CONFIG_KEYS | |
2351 | ||
2352 | /** | |
2353 | * smack_key_alloc - Set the key security blob | |
2354 | * @key: object | |
2355 | * @tsk: the task associated with the key | |
2356 | * @flags: unused | |
2357 | * | |
2358 | * No allocation required | |
2359 | * | |
2360 | * Returns 0 | |
2361 | */ | |
2362 | static int smack_key_alloc(struct key *key, struct task_struct *tsk, | |
2363 | unsigned long flags) | |
2364 | { | |
b6dff3ec | 2365 | key->security = tsk->cred->security; |
e114e473 CS |
2366 | return 0; |
2367 | } | |
2368 | ||
2369 | /** | |
2370 | * smack_key_free - Clear the key security blob | |
2371 | * @key: the object | |
2372 | * | |
2373 | * Clear the blob pointer | |
2374 | */ | |
2375 | static void smack_key_free(struct key *key) | |
2376 | { | |
2377 | key->security = NULL; | |
2378 | } | |
2379 | ||
2380 | /* | |
2381 | * smack_key_permission - Smack access on a key | |
2382 | * @key_ref: gets to the object | |
2383 | * @context: task involved | |
2384 | * @perm: unused | |
2385 | * | |
2386 | * Return 0 if the task has read and write to the object, | |
2387 | * an error code otherwise | |
2388 | */ | |
2389 | static int smack_key_permission(key_ref_t key_ref, | |
2390 | struct task_struct *context, key_perm_t perm) | |
2391 | { | |
2392 | struct key *keyp; | |
2393 | ||
2394 | keyp = key_ref_to_ptr(key_ref); | |
2395 | if (keyp == NULL) | |
2396 | return -EINVAL; | |
2397 | /* | |
2398 | * If the key hasn't been initialized give it access so that | |
2399 | * it may do so. | |
2400 | */ | |
2401 | if (keyp->security == NULL) | |
2402 | return 0; | |
2403 | /* | |
2404 | * This should not occur | |
2405 | */ | |
b6dff3ec | 2406 | if (context->cred->security == NULL) |
e114e473 CS |
2407 | return -EACCES; |
2408 | ||
b6dff3ec DH |
2409 | return smk_access(context->cred->security, keyp->security, |
2410 | MAY_READWRITE); | |
e114e473 CS |
2411 | } |
2412 | #endif /* CONFIG_KEYS */ | |
2413 | ||
d20bdda6 AD |
2414 | /* |
2415 | * Smack Audit hooks | |
2416 | * | |
2417 | * Audit requires a unique representation of each Smack specific | |
2418 | * rule. This unique representation is used to distinguish the | |
2419 | * object to be audited from remaining kernel objects and also | |
2420 | * works as a glue between the audit hooks. | |
2421 | * | |
2422 | * Since repository entries are added but never deleted, we'll use | |
2423 | * the smack_known label address related to the given audit rule as | |
2424 | * the needed unique representation. This also better fits the smack | |
2425 | * model where nearly everything is a label. | |
2426 | */ | |
2427 | #ifdef CONFIG_AUDIT | |
2428 | ||
2429 | /** | |
2430 | * smack_audit_rule_init - Initialize a smack audit rule | |
2431 | * @field: audit rule fields given from user-space (audit.h) | |
2432 | * @op: required testing operator (=, !=, >, <, ...) | |
2433 | * @rulestr: smack label to be audited | |
2434 | * @vrule: pointer to save our own audit rule representation | |
2435 | * | |
2436 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2437 | * The label to be audited is created if necessay. | |
2438 | */ | |
2439 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2440 | { | |
2441 | char **rule = (char **)vrule; | |
2442 | *rule = NULL; | |
2443 | ||
2444 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2445 | return -EINVAL; | |
2446 | ||
2447 | if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL) | |
2448 | return -EINVAL; | |
2449 | ||
2450 | *rule = smk_import(rulestr, 0); | |
2451 | ||
2452 | return 0; | |
2453 | } | |
2454 | ||
2455 | /** | |
2456 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2457 | * @krule: rule of interest, in Audit kernel representation format | |
2458 | * | |
2459 | * This is used to filter Smack rules from remaining Audit ones. | |
2460 | * If it's proved that this rule belongs to us, the | |
2461 | * audit_rule_match hook will be called to do the final judgement. | |
2462 | */ | |
2463 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2464 | { | |
2465 | struct audit_field *f; | |
2466 | int i; | |
2467 | ||
2468 | for (i = 0; i < krule->field_count; i++) { | |
2469 | f = &krule->fields[i]; | |
2470 | ||
2471 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2472 | return 1; | |
2473 | } | |
2474 | ||
2475 | return 0; | |
2476 | } | |
2477 | ||
2478 | /** | |
2479 | * smack_audit_rule_match - Audit given object ? | |
2480 | * @secid: security id for identifying the object to test | |
2481 | * @field: audit rule flags given from user-space | |
2482 | * @op: required testing operator | |
2483 | * @vrule: smack internal rule presentation | |
2484 | * @actx: audit context associated with the check | |
2485 | * | |
2486 | * The core Audit hook. It's used to take the decision of | |
2487 | * whether to audit or not to audit a given object. | |
2488 | */ | |
2489 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2490 | struct audit_context *actx) | |
2491 | { | |
2492 | char *smack; | |
2493 | char *rule = vrule; | |
2494 | ||
2495 | if (!rule) { | |
2496 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2497 | "Smack: missing rule\n"); | |
2498 | return -ENOENT; | |
2499 | } | |
2500 | ||
2501 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2502 | return 0; | |
2503 | ||
2504 | smack = smack_from_secid(secid); | |
2505 | ||
2506 | /* | |
2507 | * No need to do string comparisons. If a match occurs, | |
2508 | * both pointers will point to the same smack_known | |
2509 | * label. | |
2510 | */ | |
2511 | if (op == AUDIT_EQUAL) | |
2512 | return (rule == smack); | |
2513 | if (op == AUDIT_NOT_EQUAL) | |
2514 | return (rule != smack); | |
2515 | ||
2516 | return 0; | |
2517 | } | |
2518 | ||
2519 | /** | |
2520 | * smack_audit_rule_free - free smack rule representation | |
2521 | * @vrule: rule to be freed. | |
2522 | * | |
2523 | * No memory was allocated. | |
2524 | */ | |
2525 | static void smack_audit_rule_free(void *vrule) | |
2526 | { | |
2527 | /* No-op */ | |
2528 | } | |
2529 | ||
2530 | #endif /* CONFIG_AUDIT */ | |
2531 | ||
e114e473 CS |
2532 | /* |
2533 | * smack_secid_to_secctx - return the smack label for a secid | |
2534 | * @secid: incoming integer | |
2535 | * @secdata: destination | |
2536 | * @seclen: how long it is | |
2537 | * | |
2538 | * Exists for networking code. | |
2539 | */ | |
2540 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
2541 | { | |
2542 | char *sp = smack_from_secid(secid); | |
2543 | ||
2544 | *secdata = sp; | |
2545 | *seclen = strlen(sp); | |
2546 | return 0; | |
2547 | } | |
2548 | ||
4bc87e62 CS |
2549 | /* |
2550 | * smack_secctx_to_secid - return the secid for a smack label | |
2551 | * @secdata: smack label | |
2552 | * @seclen: how long result is | |
2553 | * @secid: outgoing integer | |
2554 | * | |
2555 | * Exists for audit and networking code. | |
2556 | */ | |
e52c1764 | 2557 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
2558 | { |
2559 | *secid = smack_to_secid(secdata); | |
2560 | return 0; | |
2561 | } | |
2562 | ||
e114e473 CS |
2563 | /* |
2564 | * smack_release_secctx - don't do anything. | |
2565 | * @key_ref: unused | |
2566 | * @context: unused | |
2567 | * @perm: unused | |
2568 | * | |
2569 | * Exists to make sure nothing gets done, and properly | |
2570 | */ | |
2571 | static void smack_release_secctx(char *secdata, u32 seclen) | |
2572 | { | |
2573 | } | |
2574 | ||
076c54c5 AD |
2575 | struct security_operations smack_ops = { |
2576 | .name = "smack", | |
2577 | ||
5cd9c58f DH |
2578 | .ptrace_may_access = smack_ptrace_may_access, |
2579 | .ptrace_traceme = smack_ptrace_traceme, | |
e114e473 CS |
2580 | .capget = cap_capget, |
2581 | .capset_check = cap_capset_check, | |
2582 | .capset_set = cap_capset_set, | |
2583 | .capable = cap_capable, | |
2584 | .syslog = smack_syslog, | |
2585 | .settime = cap_settime, | |
2586 | .vm_enough_memory = cap_vm_enough_memory, | |
2587 | ||
2588 | .bprm_apply_creds = cap_bprm_apply_creds, | |
2589 | .bprm_set_security = cap_bprm_set_security, | |
2590 | .bprm_secureexec = cap_bprm_secureexec, | |
2591 | ||
2592 | .sb_alloc_security = smack_sb_alloc_security, | |
2593 | .sb_free_security = smack_sb_free_security, | |
2594 | .sb_copy_data = smack_sb_copy_data, | |
2595 | .sb_kern_mount = smack_sb_kern_mount, | |
2596 | .sb_statfs = smack_sb_statfs, | |
2597 | .sb_mount = smack_sb_mount, | |
2598 | .sb_umount = smack_sb_umount, | |
2599 | ||
2600 | .inode_alloc_security = smack_inode_alloc_security, | |
2601 | .inode_free_security = smack_inode_free_security, | |
2602 | .inode_init_security = smack_inode_init_security, | |
2603 | .inode_link = smack_inode_link, | |
2604 | .inode_unlink = smack_inode_unlink, | |
2605 | .inode_rmdir = smack_inode_rmdir, | |
2606 | .inode_rename = smack_inode_rename, | |
2607 | .inode_permission = smack_inode_permission, | |
2608 | .inode_setattr = smack_inode_setattr, | |
2609 | .inode_getattr = smack_inode_getattr, | |
2610 | .inode_setxattr = smack_inode_setxattr, | |
2611 | .inode_post_setxattr = smack_inode_post_setxattr, | |
2612 | .inode_getxattr = smack_inode_getxattr, | |
2613 | .inode_removexattr = smack_inode_removexattr, | |
bcdca225 CS |
2614 | .inode_need_killpriv = cap_inode_need_killpriv, |
2615 | .inode_killpriv = cap_inode_killpriv, | |
e114e473 CS |
2616 | .inode_getsecurity = smack_inode_getsecurity, |
2617 | .inode_setsecurity = smack_inode_setsecurity, | |
2618 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 2619 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
2620 | |
2621 | .file_permission = smack_file_permission, | |
2622 | .file_alloc_security = smack_file_alloc_security, | |
2623 | .file_free_security = smack_file_free_security, | |
2624 | .file_ioctl = smack_file_ioctl, | |
2625 | .file_lock = smack_file_lock, | |
2626 | .file_fcntl = smack_file_fcntl, | |
2627 | .file_set_fowner = smack_file_set_fowner, | |
2628 | .file_send_sigiotask = smack_file_send_sigiotask, | |
2629 | .file_receive = smack_file_receive, | |
2630 | ||
f1752eec DH |
2631 | .cred_alloc_security = smack_cred_alloc_security, |
2632 | .cred_free = smack_cred_free, | |
e114e473 CS |
2633 | .task_post_setuid = cap_task_post_setuid, |
2634 | .task_setpgid = smack_task_setpgid, | |
2635 | .task_getpgid = smack_task_getpgid, | |
2636 | .task_getsid = smack_task_getsid, | |
2637 | .task_getsecid = smack_task_getsecid, | |
2638 | .task_setnice = smack_task_setnice, | |
2639 | .task_setioprio = smack_task_setioprio, | |
2640 | .task_getioprio = smack_task_getioprio, | |
2641 | .task_setscheduler = smack_task_setscheduler, | |
2642 | .task_getscheduler = smack_task_getscheduler, | |
2643 | .task_movememory = smack_task_movememory, | |
2644 | .task_kill = smack_task_kill, | |
2645 | .task_wait = smack_task_wait, | |
2646 | .task_reparent_to_init = cap_task_reparent_to_init, | |
2647 | .task_to_inode = smack_task_to_inode, | |
1236cc3c | 2648 | .task_prctl = cap_task_prctl, |
e114e473 CS |
2649 | |
2650 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 2651 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
2652 | |
2653 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
2654 | .msg_msg_free_security = smack_msg_msg_free_security, | |
2655 | ||
2656 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
2657 | .msg_queue_free_security = smack_msg_queue_free_security, | |
2658 | .msg_queue_associate = smack_msg_queue_associate, | |
2659 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
2660 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
2661 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
2662 | ||
2663 | .shm_alloc_security = smack_shm_alloc_security, | |
2664 | .shm_free_security = smack_shm_free_security, | |
2665 | .shm_associate = smack_shm_associate, | |
2666 | .shm_shmctl = smack_shm_shmctl, | |
2667 | .shm_shmat = smack_shm_shmat, | |
2668 | ||
2669 | .sem_alloc_security = smack_sem_alloc_security, | |
2670 | .sem_free_security = smack_sem_free_security, | |
2671 | .sem_associate = smack_sem_associate, | |
2672 | .sem_semctl = smack_sem_semctl, | |
2673 | .sem_semop = smack_sem_semop, | |
2674 | ||
2675 | .netlink_send = cap_netlink_send, | |
2676 | .netlink_recv = cap_netlink_recv, | |
2677 | ||
2678 | .d_instantiate = smack_d_instantiate, | |
2679 | ||
2680 | .getprocattr = smack_getprocattr, | |
2681 | .setprocattr = smack_setprocattr, | |
2682 | ||
2683 | .unix_stream_connect = smack_unix_stream_connect, | |
2684 | .unix_may_send = smack_unix_may_send, | |
2685 | ||
2686 | .socket_post_create = smack_socket_post_create, | |
2687 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, | |
2688 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
2689 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
2690 | .sk_alloc_security = smack_sk_alloc_security, | |
2691 | .sk_free_security = smack_sk_free_security, | |
2692 | .sock_graft = smack_sock_graft, | |
2693 | .inet_conn_request = smack_inet_conn_request, | |
d20bdda6 | 2694 | |
e114e473 CS |
2695 | /* key management security hooks */ |
2696 | #ifdef CONFIG_KEYS | |
2697 | .key_alloc = smack_key_alloc, | |
2698 | .key_free = smack_key_free, | |
2699 | .key_permission = smack_key_permission, | |
2700 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
2701 | |
2702 | /* Audit hooks */ | |
2703 | #ifdef CONFIG_AUDIT | |
2704 | .audit_rule_init = smack_audit_rule_init, | |
2705 | .audit_rule_known = smack_audit_rule_known, | |
2706 | .audit_rule_match = smack_audit_rule_match, | |
2707 | .audit_rule_free = smack_audit_rule_free, | |
2708 | #endif /* CONFIG_AUDIT */ | |
2709 | ||
e114e473 | 2710 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 2711 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 CS |
2712 | .release_secctx = smack_release_secctx, |
2713 | }; | |
2714 | ||
2715 | /** | |
2716 | * smack_init - initialize the smack system | |
2717 | * | |
2718 | * Returns 0 | |
2719 | */ | |
2720 | static __init int smack_init(void) | |
2721 | { | |
076c54c5 AD |
2722 | if (!security_module_enable(&smack_ops)) |
2723 | return 0; | |
2724 | ||
e114e473 CS |
2725 | printk(KERN_INFO "Smack: Initializing.\n"); |
2726 | ||
2727 | /* | |
2728 | * Set the security state for the initial task. | |
2729 | */ | |
b6dff3ec | 2730 | current->cred->security = &smack_known_floor.smk_known; |
e114e473 CS |
2731 | |
2732 | /* | |
2733 | * Initialize locks | |
2734 | */ | |
2735 | spin_lock_init(&smack_known_unset.smk_cipsolock); | |
2736 | spin_lock_init(&smack_known_huh.smk_cipsolock); | |
2737 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
2738 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
2739 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
2740 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
2741 | ||
2742 | /* | |
2743 | * Register with LSM | |
2744 | */ | |
2745 | if (register_security(&smack_ops)) | |
2746 | panic("smack: Unable to register with kernel.\n"); | |
2747 | ||
2748 | return 0; | |
2749 | } | |
2750 | ||
2751 | /* | |
2752 | * Smack requires early initialization in order to label | |
2753 | * all processes and objects when they are created. | |
2754 | */ | |
2755 | security_initcall(smack_init); |