]>
Commit | Line | Data |
---|---|---|
e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
e114e473 CS |
44 | #include "smack.h" |
45 | ||
c69e8d9c DH |
46 | #define task_security(task) (task_cred_xxx((task), security)) |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
55 | LIST_HEAD(smk_ipv6_port_list); | |
56 | ||
e114e473 CS |
57 | /** |
58 | * smk_fetch - Fetch the smack label from a file. | |
59 | * @ip: a pointer to the inode | |
60 | * @dp: a pointer to the dentry | |
61 | * | |
62 | * Returns a pointer to the master list entry for the Smack label | |
63 | * or NULL if there was no label to fetch. | |
64 | */ | |
2f823ff8 CS |
65 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
66 | struct dentry *dp) | |
e114e473 CS |
67 | { |
68 | int rc; | |
f7112e6c | 69 | char *buffer; |
2f823ff8 | 70 | struct smack_known *skp = NULL; |
e114e473 CS |
71 | |
72 | if (ip->i_op->getxattr == NULL) | |
73 | return NULL; | |
74 | ||
f7112e6c CS |
75 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
76 | if (buffer == NULL) | |
e114e473 CS |
77 | return NULL; |
78 | ||
f7112e6c CS |
79 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
80 | if (rc > 0) | |
2f823ff8 | 81 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
82 | |
83 | kfree(buffer); | |
84 | ||
2f823ff8 | 85 | return skp; |
e114e473 CS |
86 | } |
87 | ||
88 | /** | |
89 | * new_inode_smack - allocate an inode security blob | |
90 | * @smack: a pointer to the Smack label to use in the blob | |
91 | * | |
92 | * Returns the new blob or NULL if there's no memory available | |
93 | */ | |
94 | struct inode_smack *new_inode_smack(char *smack) | |
95 | { | |
96 | struct inode_smack *isp; | |
97 | ||
ceffec55 | 98 | isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); |
e114e473 CS |
99 | if (isp == NULL) |
100 | return NULL; | |
101 | ||
102 | isp->smk_inode = smack; | |
103 | isp->smk_flags = 0; | |
104 | mutex_init(&isp->smk_lock); | |
105 | ||
106 | return isp; | |
107 | } | |
108 | ||
7898e1f8 CS |
109 | /** |
110 | * new_task_smack - allocate a task security blob | |
111 | * @smack: a pointer to the Smack label to use in the blob | |
112 | * | |
113 | * Returns the new blob or NULL if there's no memory available | |
114 | */ | |
2f823ff8 CS |
115 | static struct task_smack *new_task_smack(struct smack_known *task, |
116 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
117 | { |
118 | struct task_smack *tsp; | |
119 | ||
120 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
121 | if (tsp == NULL) | |
122 | return NULL; | |
123 | ||
124 | tsp->smk_task = task; | |
125 | tsp->smk_forked = forked; | |
126 | INIT_LIST_HEAD(&tsp->smk_rules); | |
127 | mutex_init(&tsp->smk_rules_lock); | |
128 | ||
129 | return tsp; | |
130 | } | |
131 | ||
132 | /** | |
133 | * smk_copy_rules - copy a rule set | |
134 | * @nhead - new rules header pointer | |
135 | * @ohead - old rules header pointer | |
136 | * | |
137 | * Returns 0 on success, -ENOMEM on error | |
138 | */ | |
139 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
140 | gfp_t gfp) | |
141 | { | |
142 | struct smack_rule *nrp; | |
143 | struct smack_rule *orp; | |
144 | int rc = 0; | |
145 | ||
146 | INIT_LIST_HEAD(nhead); | |
147 | ||
148 | list_for_each_entry_rcu(orp, ohead, list) { | |
149 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
150 | if (nrp == NULL) { | |
151 | rc = -ENOMEM; | |
152 | break; | |
153 | } | |
154 | *nrp = *orp; | |
155 | list_add_rcu(&nrp->list, nhead); | |
156 | } | |
157 | return rc; | |
158 | } | |
159 | ||
5663884c LP |
160 | /** |
161 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
162 | * @mode - input mode in form of PTRACE_MODE_* | |
163 | * | |
164 | * Returns a converted MAY_* mode usable by smack rules | |
165 | */ | |
166 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
167 | { | |
168 | switch (mode) { | |
169 | case PTRACE_MODE_READ: | |
170 | return MAY_READ; | |
171 | case PTRACE_MODE_ATTACH: | |
172 | return MAY_READWRITE; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | /** | |
179 | * smk_ptrace_rule_check - helper for ptrace access | |
180 | * @tracer: tracer process | |
66867818 LP |
181 | * @tracee_label: label of the process that's about to be traced, |
182 | * the pointer must originate from smack structures | |
5663884c LP |
183 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
184 | * @func: name of the function that called us, used for audit | |
185 | * | |
186 | * Returns 0 on access granted, -error on error | |
187 | */ | |
188 | static int smk_ptrace_rule_check(struct task_struct *tracer, char *tracee_label, | |
189 | unsigned int mode, const char *func) | |
190 | { | |
191 | int rc; | |
192 | struct smk_audit_info ad, *saip = NULL; | |
193 | struct task_smack *tsp; | |
194 | struct smack_known *skp; | |
195 | ||
196 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
197 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
198 | smk_ad_setfield_u_tsk(&ad, tracer); | |
199 | saip = &ad; | |
200 | } | |
201 | ||
202 | tsp = task_security(tracer); | |
203 | skp = smk_of_task(tsp); | |
204 | ||
66867818 LP |
205 | if ((mode & PTRACE_MODE_ATTACH) && |
206 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
207 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
208 | if (skp->smk_known == tracee_label) | |
209 | rc = 0; | |
210 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
211 | rc = -EACCES; | |
212 | else if (capable(CAP_SYS_PTRACE)) | |
213 | rc = 0; | |
214 | else | |
215 | rc = -EACCES; | |
216 | ||
217 | if (saip) | |
218 | smack_log(skp->smk_known, tracee_label, 0, rc, saip); | |
219 | ||
220 | return rc; | |
221 | } | |
222 | ||
223 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
5663884c LP |
224 | rc = smk_tskacc(tsp, tracee_label, smk_ptrace_mode(mode), saip); |
225 | return rc; | |
226 | } | |
227 | ||
e114e473 CS |
228 | /* |
229 | * LSM hooks. | |
230 | * We he, that is fun! | |
231 | */ | |
232 | ||
233 | /** | |
9e48858f | 234 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 235 | * @ctp: child task pointer |
5663884c | 236 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
237 | * |
238 | * Returns 0 if access is OK, an error code otherwise | |
239 | * | |
5663884c | 240 | * Do the capability checks. |
e114e473 | 241 | */ |
9e48858f | 242 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
243 | { |
244 | int rc; | |
2f823ff8 | 245 | struct smack_known *skp; |
e114e473 | 246 | |
9e48858f | 247 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
248 | if (rc != 0) |
249 | return rc; | |
250 | ||
2f823ff8 | 251 | skp = smk_of_task(task_security(ctp)); |
ecfcc53f | 252 | |
5663884c | 253 | rc = smk_ptrace_rule_check(current, skp->smk_known, mode, __func__); |
5cd9c58f DH |
254 | return rc; |
255 | } | |
256 | ||
257 | /** | |
258 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
259 | * @ptp: parent task pointer | |
260 | * | |
261 | * Returns 0 if access is OK, an error code otherwise | |
262 | * | |
5663884c | 263 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
264 | */ |
265 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
266 | { | |
267 | int rc; | |
2f823ff8 | 268 | struct smack_known *skp; |
5cd9c58f DH |
269 | |
270 | rc = cap_ptrace_traceme(ptp); | |
271 | if (rc != 0) | |
272 | return rc; | |
e114e473 | 273 | |
959e6c7f | 274 | skp = smk_of_task(current_security()); |
ecfcc53f | 275 | |
5663884c LP |
276 | rc = smk_ptrace_rule_check(ptp, skp->smk_known, |
277 | PTRACE_MODE_ATTACH, __func__); | |
e114e473 CS |
278 | return rc; |
279 | } | |
280 | ||
281 | /** | |
282 | * smack_syslog - Smack approval on syslog | |
283 | * @type: message type | |
284 | * | |
e114e473 CS |
285 | * Returns 0 on success, error code otherwise. |
286 | */ | |
12b3052c | 287 | static int smack_syslog(int typefrom_file) |
e114e473 | 288 | { |
12b3052c | 289 | int rc = 0; |
2f823ff8 | 290 | struct smack_known *skp = smk_of_current(); |
e114e473 | 291 | |
1880eff7 | 292 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
293 | return 0; |
294 | ||
24ea1b6e | 295 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
296 | rc = -EACCES; |
297 | ||
298 | return rc; | |
299 | } | |
300 | ||
301 | ||
302 | /* | |
303 | * Superblock Hooks. | |
304 | */ | |
305 | ||
306 | /** | |
307 | * smack_sb_alloc_security - allocate a superblock blob | |
308 | * @sb: the superblock getting the blob | |
309 | * | |
310 | * Returns 0 on success or -ENOMEM on error. | |
311 | */ | |
312 | static int smack_sb_alloc_security(struct super_block *sb) | |
313 | { | |
314 | struct superblock_smack *sbsp; | |
315 | ||
316 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
317 | ||
318 | if (sbsp == NULL) | |
319 | return -ENOMEM; | |
320 | ||
321 | sbsp->smk_root = smack_known_floor.smk_known; | |
322 | sbsp->smk_default = smack_known_floor.smk_known; | |
323 | sbsp->smk_floor = smack_known_floor.smk_known; | |
324 | sbsp->smk_hat = smack_known_hat.smk_known; | |
e830b394 CS |
325 | /* |
326 | * smk_initialized will be zero from kzalloc. | |
327 | */ | |
e114e473 CS |
328 | sb->s_security = sbsp; |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /** | |
334 | * smack_sb_free_security - free a superblock blob | |
335 | * @sb: the superblock getting the blob | |
336 | * | |
337 | */ | |
338 | static void smack_sb_free_security(struct super_block *sb) | |
339 | { | |
340 | kfree(sb->s_security); | |
341 | sb->s_security = NULL; | |
342 | } | |
343 | ||
344 | /** | |
345 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 346 | * @orig: where to start |
251a2a95 | 347 | * @smackopts: mount options string |
e114e473 CS |
348 | * |
349 | * Returns 0 on success or -ENOMEM on error. | |
350 | * | |
351 | * Copy the Smack specific mount options out of the mount | |
352 | * options list. | |
353 | */ | |
e0007529 | 354 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
355 | { |
356 | char *cp, *commap, *otheropts, *dp; | |
357 | ||
e114e473 CS |
358 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
359 | if (otheropts == NULL) | |
360 | return -ENOMEM; | |
361 | ||
362 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
363 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
364 | dp = smackopts; | |
365 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
366 | dp = smackopts; | |
367 | else if (strstr(cp, SMK_FSHAT) == cp) | |
368 | dp = smackopts; | |
369 | else if (strstr(cp, SMK_FSROOT) == cp) | |
370 | dp = smackopts; | |
e830b394 CS |
371 | else if (strstr(cp, SMK_FSTRANS) == cp) |
372 | dp = smackopts; | |
e114e473 CS |
373 | else |
374 | dp = otheropts; | |
375 | ||
376 | commap = strchr(cp, ','); | |
377 | if (commap != NULL) | |
378 | *commap = '\0'; | |
379 | ||
380 | if (*dp != '\0') | |
381 | strcat(dp, ","); | |
382 | strcat(dp, cp); | |
383 | } | |
384 | ||
385 | strcpy(orig, otheropts); | |
386 | free_page((unsigned long)otheropts); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | /** | |
392 | * smack_sb_kern_mount - Smack specific mount processing | |
393 | * @sb: the file system superblock | |
12204e24 | 394 | * @flags: the mount flags |
e114e473 CS |
395 | * @data: the smack mount options |
396 | * | |
397 | * Returns 0 on success, an error code on failure | |
398 | */ | |
12204e24 | 399 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
400 | { |
401 | struct dentry *root = sb->s_root; | |
402 | struct inode *inode = root->d_inode; | |
403 | struct superblock_smack *sp = sb->s_security; | |
404 | struct inode_smack *isp; | |
24ea1b6e | 405 | struct smack_known *skp; |
e114e473 CS |
406 | char *op; |
407 | char *commap; | |
408 | char *nsp; | |
e830b394 | 409 | int transmute = 0; |
24ea1b6e | 410 | int specified = 0; |
e114e473 | 411 | |
e830b394 | 412 | if (sp->smk_initialized) |
e114e473 | 413 | return 0; |
eb982cb4 | 414 | |
e114e473 | 415 | sp->smk_initialized = 1; |
e114e473 CS |
416 | |
417 | for (op = data; op != NULL; op = commap) { | |
418 | commap = strchr(op, ','); | |
419 | if (commap != NULL) | |
420 | *commap++ = '\0'; | |
421 | ||
422 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
423 | op += strlen(SMK_FSHAT); | |
424 | nsp = smk_import(op, 0); | |
24ea1b6e | 425 | if (nsp != NULL) { |
e114e473 | 426 | sp->smk_hat = nsp; |
24ea1b6e CS |
427 | specified = 1; |
428 | } | |
e114e473 CS |
429 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
430 | op += strlen(SMK_FSFLOOR); | |
431 | nsp = smk_import(op, 0); | |
24ea1b6e | 432 | if (nsp != NULL) { |
e114e473 | 433 | sp->smk_floor = nsp; |
24ea1b6e CS |
434 | specified = 1; |
435 | } | |
e114e473 CS |
436 | } else if (strncmp(op, SMK_FSDEFAULT, |
437 | strlen(SMK_FSDEFAULT)) == 0) { | |
438 | op += strlen(SMK_FSDEFAULT); | |
439 | nsp = smk_import(op, 0); | |
24ea1b6e | 440 | if (nsp != NULL) { |
e114e473 | 441 | sp->smk_default = nsp; |
24ea1b6e CS |
442 | specified = 1; |
443 | } | |
e114e473 CS |
444 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
445 | op += strlen(SMK_FSROOT); | |
446 | nsp = smk_import(op, 0); | |
24ea1b6e | 447 | if (nsp != NULL) { |
e114e473 | 448 | sp->smk_root = nsp; |
24ea1b6e CS |
449 | specified = 1; |
450 | } | |
e830b394 CS |
451 | } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { |
452 | op += strlen(SMK_FSTRANS); | |
453 | nsp = smk_import(op, 0); | |
454 | if (nsp != NULL) { | |
455 | sp->smk_root = nsp; | |
456 | transmute = 1; | |
24ea1b6e | 457 | specified = 1; |
e830b394 | 458 | } |
e114e473 CS |
459 | } |
460 | } | |
461 | ||
24ea1b6e CS |
462 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
463 | /* | |
464 | * Unprivileged mounts don't get to specify Smack values. | |
465 | */ | |
466 | if (specified) | |
467 | return -EPERM; | |
468 | /* | |
469 | * Unprivileged mounts get root and default from the caller. | |
470 | */ | |
471 | skp = smk_of_current(); | |
472 | sp->smk_root = skp->smk_known; | |
473 | sp->smk_default = skp->smk_known; | |
474 | } | |
e114e473 CS |
475 | /* |
476 | * Initialize the root inode. | |
477 | */ | |
478 | isp = inode->i_security; | |
55dfc5da JB |
479 | if (isp == NULL) { |
480 | isp = new_inode_smack(sp->smk_root); | |
481 | if (isp == NULL) | |
482 | return -ENOMEM; | |
483 | inode->i_security = isp; | |
e830b394 | 484 | } else |
e114e473 CS |
485 | isp->smk_inode = sp->smk_root; |
486 | ||
e830b394 CS |
487 | if (transmute) |
488 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
489 | ||
e114e473 CS |
490 | return 0; |
491 | } | |
492 | ||
493 | /** | |
494 | * smack_sb_statfs - Smack check on statfs | |
495 | * @dentry: identifies the file system in question | |
496 | * | |
497 | * Returns 0 if current can read the floor of the filesystem, | |
498 | * and error code otherwise | |
499 | */ | |
500 | static int smack_sb_statfs(struct dentry *dentry) | |
501 | { | |
502 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
503 | int rc; |
504 | struct smk_audit_info ad; | |
505 | ||
a269434d | 506 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 507 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 508 | |
ecfcc53f EB |
509 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
510 | return rc; | |
e114e473 CS |
511 | } |
512 | ||
676dac4b CS |
513 | /* |
514 | * BPRM hooks | |
515 | */ | |
516 | ||
ce8a4321 CS |
517 | /** |
518 | * smack_bprm_set_creds - set creds for exec | |
519 | * @bprm: the exec information | |
520 | * | |
5663884c | 521 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 522 | */ |
676dac4b CS |
523 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
524 | { | |
496ad9aa | 525 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 526 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 527 | struct inode_smack *isp; |
676dac4b CS |
528 | int rc; |
529 | ||
530 | rc = cap_bprm_set_creds(bprm); | |
531 | if (rc != 0) | |
532 | return rc; | |
533 | ||
534 | if (bprm->cred_prepared) | |
535 | return 0; | |
536 | ||
84088ba2 JS |
537 | isp = inode->i_security; |
538 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
539 | return 0; |
540 | ||
5663884c LP |
541 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
542 | struct task_struct *tracer; | |
543 | rc = 0; | |
544 | ||
545 | rcu_read_lock(); | |
546 | tracer = ptrace_parent(current); | |
547 | if (likely(tracer != NULL)) | |
548 | rc = smk_ptrace_rule_check(tracer, | |
549 | isp->smk_task->smk_known, | |
550 | PTRACE_MODE_ATTACH, | |
551 | __func__); | |
552 | rcu_read_unlock(); | |
553 | ||
554 | if (rc != 0) | |
555 | return rc; | |
556 | } else if (bprm->unsafe) | |
84088ba2 | 557 | return -EPERM; |
676dac4b | 558 | |
84088ba2 JS |
559 | bsp->smk_task = isp->smk_task; |
560 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 561 | |
84088ba2 JS |
562 | return 0; |
563 | } | |
676dac4b | 564 | |
84088ba2 JS |
565 | /** |
566 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
567 | * from bprm. | |
568 | * | |
569 | * @bprm: binprm for exec | |
570 | */ | |
571 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
572 | { | |
573 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 574 | |
84088ba2 JS |
575 | if (bsp->smk_task != bsp->smk_forked) |
576 | current->pdeath_signal = 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
581 | * @bprm: binprm for exec | |
582 | * | |
583 | * Returns 0 on success. | |
584 | */ | |
585 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
586 | { | |
587 | struct task_smack *tsp = current_security(); | |
588 | int ret = cap_bprm_secureexec(bprm); | |
589 | ||
590 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
591 | ret = 1; | |
592 | ||
593 | return ret; | |
676dac4b CS |
594 | } |
595 | ||
e114e473 CS |
596 | /* |
597 | * Inode hooks | |
598 | */ | |
599 | ||
600 | /** | |
601 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 602 | * @inode: the inode in need of a blob |
e114e473 CS |
603 | * |
604 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
605 | */ | |
606 | static int smack_inode_alloc_security(struct inode *inode) | |
607 | { | |
2f823ff8 CS |
608 | struct smack_known *skp = smk_of_current(); |
609 | ||
610 | inode->i_security = new_inode_smack(skp->smk_known); | |
e114e473 CS |
611 | if (inode->i_security == NULL) |
612 | return -ENOMEM; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /** | |
617 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 618 | * @inode: the inode with a blob |
e114e473 CS |
619 | * |
620 | * Clears the blob pointer in inode | |
621 | */ | |
622 | static void smack_inode_free_security(struct inode *inode) | |
623 | { | |
624 | kfree(inode->i_security); | |
625 | inode->i_security = NULL; | |
626 | } | |
627 | ||
628 | /** | |
629 | * smack_inode_init_security - copy out the smack from an inode | |
630 | * @inode: the inode | |
631 | * @dir: unused | |
2a7dba39 | 632 | * @qstr: unused |
e114e473 CS |
633 | * @name: where to put the attribute name |
634 | * @value: where to put the attribute value | |
635 | * @len: where to put the length of the attribute | |
636 | * | |
637 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
638 | */ | |
639 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 640 | const struct qstr *qstr, const char **name, |
2a7dba39 | 641 | void **value, size_t *len) |
e114e473 | 642 | { |
2267b13a | 643 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 644 | struct smack_known *skp = smk_of_current(); |
e114e473 | 645 | char *isp = smk_of_inode(inode); |
5c6d1125 | 646 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 647 | int may; |
e114e473 | 648 | |
9548906b TH |
649 | if (name) |
650 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 CS |
651 | |
652 | if (value) { | |
7898e1f8 | 653 | rcu_read_lock(); |
2f823ff8 | 654 | may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules); |
7898e1f8 | 655 | rcu_read_unlock(); |
5c6d1125 JS |
656 | |
657 | /* | |
658 | * If the access rule allows transmutation and | |
659 | * the directory requests transmutation then | |
660 | * by all means transmute. | |
2267b13a | 661 | * Mark the inode as changed. |
5c6d1125 | 662 | */ |
7898e1f8 | 663 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 664 | smk_inode_transmutable(dir)) { |
5c6d1125 | 665 | isp = dsp; |
2267b13a CS |
666 | issp->smk_flags |= SMK_INODE_CHANGED; |
667 | } | |
5c6d1125 | 668 | |
ceffec55 | 669 | *value = kstrdup(isp, GFP_NOFS); |
e114e473 CS |
670 | if (*value == NULL) |
671 | return -ENOMEM; | |
672 | } | |
673 | ||
674 | if (len) | |
675 | *len = strlen(isp) + 1; | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | /** | |
681 | * smack_inode_link - Smack check on link | |
682 | * @old_dentry: the existing object | |
683 | * @dir: unused | |
684 | * @new_dentry: the new object | |
685 | * | |
686 | * Returns 0 if access is permitted, an error code otherwise | |
687 | */ | |
688 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
689 | struct dentry *new_dentry) | |
690 | { | |
e114e473 | 691 | char *isp; |
ecfcc53f EB |
692 | struct smk_audit_info ad; |
693 | int rc; | |
694 | ||
a269434d | 695 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 696 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
697 | |
698 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 699 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
700 | |
701 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
702 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
703 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
704 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
705 | } |
706 | ||
707 | return rc; | |
708 | } | |
709 | ||
710 | /** | |
711 | * smack_inode_unlink - Smack check on inode deletion | |
712 | * @dir: containing directory object | |
713 | * @dentry: file to unlink | |
714 | * | |
715 | * Returns 0 if current can write the containing directory | |
716 | * and the object, error code otherwise | |
717 | */ | |
718 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
719 | { | |
720 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 721 | struct smk_audit_info ad; |
e114e473 CS |
722 | int rc; |
723 | ||
a269434d | 724 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
725 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
726 | ||
e114e473 CS |
727 | /* |
728 | * You need write access to the thing you're unlinking | |
729 | */ | |
ecfcc53f EB |
730 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
731 | if (rc == 0) { | |
e114e473 CS |
732 | /* |
733 | * You also need write access to the containing directory | |
734 | */ | |
cdb56b60 | 735 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
736 | smk_ad_setfield_u_fs_inode(&ad, dir); |
737 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
738 | } | |
e114e473 CS |
739 | return rc; |
740 | } | |
741 | ||
742 | /** | |
743 | * smack_inode_rmdir - Smack check on directory deletion | |
744 | * @dir: containing directory object | |
745 | * @dentry: directory to unlink | |
746 | * | |
747 | * Returns 0 if current can write the containing directory | |
748 | * and the directory, error code otherwise | |
749 | */ | |
750 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
751 | { | |
ecfcc53f | 752 | struct smk_audit_info ad; |
e114e473 CS |
753 | int rc; |
754 | ||
a269434d | 755 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
756 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
757 | ||
e114e473 CS |
758 | /* |
759 | * You need write access to the thing you're removing | |
760 | */ | |
ecfcc53f EB |
761 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
762 | if (rc == 0) { | |
e114e473 CS |
763 | /* |
764 | * You also need write access to the containing directory | |
765 | */ | |
cdb56b60 | 766 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
767 | smk_ad_setfield_u_fs_inode(&ad, dir); |
768 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
769 | } | |
e114e473 CS |
770 | |
771 | return rc; | |
772 | } | |
773 | ||
774 | /** | |
775 | * smack_inode_rename - Smack check on rename | |
776 | * @old_inode: the old directory | |
777 | * @old_dentry: unused | |
778 | * @new_inode: the new directory | |
779 | * @new_dentry: unused | |
780 | * | |
781 | * Read and write access is required on both the old and | |
782 | * new directories. | |
783 | * | |
784 | * Returns 0 if access is permitted, an error code otherwise | |
785 | */ | |
786 | static int smack_inode_rename(struct inode *old_inode, | |
787 | struct dentry *old_dentry, | |
788 | struct inode *new_inode, | |
789 | struct dentry *new_dentry) | |
790 | { | |
791 | int rc; | |
792 | char *isp; | |
ecfcc53f EB |
793 | struct smk_audit_info ad; |
794 | ||
a269434d | 795 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 796 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
797 | |
798 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 799 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
800 | |
801 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
802 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
803 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
804 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 805 | } |
e114e473 CS |
806 | return rc; |
807 | } | |
808 | ||
809 | /** | |
810 | * smack_inode_permission - Smack version of permission() | |
811 | * @inode: the inode in question | |
812 | * @mask: the access requested | |
e114e473 CS |
813 | * |
814 | * This is the important Smack hook. | |
815 | * | |
816 | * Returns 0 if access is permitted, -EACCES otherwise | |
817 | */ | |
e74f71eb | 818 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 819 | { |
ecfcc53f | 820 | struct smk_audit_info ad; |
e74f71eb | 821 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
822 | |
823 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
824 | /* |
825 | * No permission to check. Existence test. Yup, it's there. | |
826 | */ | |
827 | if (mask == 0) | |
828 | return 0; | |
8c9e80ed AK |
829 | |
830 | /* May be droppable after audit */ | |
e74f71eb | 831 | if (no_block) |
8c9e80ed | 832 | return -ECHILD; |
f48b7399 | 833 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
834 | smk_ad_setfield_u_fs_inode(&ad, inode); |
835 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
836 | } |
837 | ||
838 | /** | |
839 | * smack_inode_setattr - Smack check for setting attributes | |
840 | * @dentry: the object | |
841 | * @iattr: for the force flag | |
842 | * | |
843 | * Returns 0 if access is permitted, an error code otherwise | |
844 | */ | |
845 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
846 | { | |
ecfcc53f | 847 | struct smk_audit_info ad; |
e114e473 CS |
848 | /* |
849 | * Need to allow for clearing the setuid bit. | |
850 | */ | |
851 | if (iattr->ia_valid & ATTR_FORCE) | |
852 | return 0; | |
a269434d | 853 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 854 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 855 | |
ecfcc53f | 856 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
857 | } |
858 | ||
859 | /** | |
860 | * smack_inode_getattr - Smack check for getting attributes | |
861 | * @mnt: unused | |
862 | * @dentry: the object | |
863 | * | |
864 | * Returns 0 if access is permitted, an error code otherwise | |
865 | */ | |
866 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
867 | { | |
ecfcc53f | 868 | struct smk_audit_info ad; |
a269434d | 869 | struct path path; |
ecfcc53f | 870 | |
a269434d EP |
871 | path.dentry = dentry; |
872 | path.mnt = mnt; | |
ecfcc53f | 873 | |
f48b7399 | 874 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 875 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 876 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
877 | } |
878 | ||
879 | /** | |
880 | * smack_inode_setxattr - Smack check for setting xattrs | |
881 | * @dentry: the object | |
882 | * @name: name of the attribute | |
883 | * @value: unused | |
884 | * @size: unused | |
885 | * @flags: unused | |
886 | * | |
887 | * This protects the Smack attribute explicitly. | |
888 | * | |
889 | * Returns 0 if access is permitted, an error code otherwise | |
890 | */ | |
8f0cfa52 DH |
891 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
892 | const void *value, size_t size, int flags) | |
e114e473 | 893 | { |
ecfcc53f | 894 | struct smk_audit_info ad; |
19760ad0 CS |
895 | struct smack_known *skp; |
896 | int check_priv = 0; | |
897 | int check_import = 0; | |
898 | int check_star = 0; | |
bcdca225 | 899 | int rc = 0; |
e114e473 | 900 | |
19760ad0 CS |
901 | /* |
902 | * Check label validity here so import won't fail in post_setxattr | |
903 | */ | |
bcdca225 CS |
904 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
905 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
906 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
907 | check_priv = 1; | |
908 | check_import = 1; | |
909 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
910 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
911 | check_priv = 1; | |
912 | check_import = 1; | |
913 | check_star = 1; | |
5c6d1125 | 914 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 915 | check_priv = 1; |
5c6d1125 JS |
916 | if (size != TRANS_TRUE_SIZE || |
917 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
918 | rc = -EINVAL; | |
bcdca225 CS |
919 | } else |
920 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
921 | ||
19760ad0 CS |
922 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
923 | rc = -EPERM; | |
924 | ||
925 | if (rc == 0 && check_import) { | |
b862e561 | 926 | skp = size ? smk_import_entry(value, size) : NULL; |
19760ad0 CS |
927 | if (skp == NULL || (check_star && |
928 | (skp == &smack_known_star || skp == &smack_known_web))) | |
929 | rc = -EINVAL; | |
930 | } | |
931 | ||
a269434d | 932 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
933 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
934 | ||
bcdca225 | 935 | if (rc == 0) |
ecfcc53f | 936 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
937 | |
938 | return rc; | |
e114e473 CS |
939 | } |
940 | ||
941 | /** | |
942 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
943 | * @dentry: object | |
944 | * @name: attribute name | |
945 | * @value: attribute value | |
946 | * @size: attribute size | |
947 | * @flags: unused | |
948 | * | |
949 | * Set the pointer in the inode blob to the entry found | |
950 | * in the master label list. | |
951 | */ | |
8f0cfa52 DH |
952 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
953 | const void *value, size_t size, int flags) | |
e114e473 | 954 | { |
2f823ff8 | 955 | struct smack_known *skp; |
5c6d1125 | 956 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b | 957 | |
2f823ff8 CS |
958 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
959 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
960 | return; | |
961 | } | |
962 | ||
676dac4b | 963 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 964 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
965 | if (skp != NULL) |
966 | isp->smk_inode = skp->smk_known; | |
676dac4b CS |
967 | else |
968 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 | 969 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 970 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
971 | if (skp != NULL) |
972 | isp->smk_task = skp; | |
676dac4b | 973 | else |
2f823ff8 | 974 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 975 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 976 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
977 | if (skp != NULL) |
978 | isp->smk_mmap = skp; | |
7898e1f8 | 979 | else |
2f823ff8 CS |
980 | isp->smk_mmap = &smack_known_invalid; |
981 | } | |
e114e473 CS |
982 | |
983 | return; | |
984 | } | |
985 | ||
ce8a4321 | 986 | /** |
e114e473 CS |
987 | * smack_inode_getxattr - Smack check on getxattr |
988 | * @dentry: the object | |
989 | * @name: unused | |
990 | * | |
991 | * Returns 0 if access is permitted, an error code otherwise | |
992 | */ | |
8f0cfa52 | 993 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 994 | { |
ecfcc53f EB |
995 | struct smk_audit_info ad; |
996 | ||
a269434d | 997 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
998 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
999 | ||
1000 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
1001 | } |
1002 | ||
ce8a4321 | 1003 | /** |
e114e473 CS |
1004 | * smack_inode_removexattr - Smack check on removexattr |
1005 | * @dentry: the object | |
1006 | * @name: name of the attribute | |
1007 | * | |
1008 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1009 | * | |
1010 | * Returns 0 if access is permitted, an error code otherwise | |
1011 | */ | |
8f0cfa52 | 1012 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1013 | { |
676dac4b | 1014 | struct inode_smack *isp; |
ecfcc53f | 1015 | struct smk_audit_info ad; |
bcdca225 | 1016 | int rc = 0; |
e114e473 | 1017 | |
bcdca225 CS |
1018 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1019 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1020 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1021 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1022 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1023 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1024 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1025 | rc = -EPERM; |
1026 | } else | |
1027 | rc = cap_inode_removexattr(dentry, name); | |
1028 | ||
f59bdfba CS |
1029 | if (rc != 0) |
1030 | return rc; | |
1031 | ||
a269434d | 1032 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1033 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1034 | |
f59bdfba CS |
1035 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
1036 | if (rc != 0) | |
1037 | return rc; | |
1038 | ||
1039 | isp = dentry->d_inode->i_security; | |
1040 | /* | |
1041 | * Don't do anything special for these. | |
1042 | * XATTR_NAME_SMACKIPIN | |
1043 | * XATTR_NAME_SMACKIPOUT | |
1044 | * XATTR_NAME_SMACKEXEC | |
1045 | */ | |
1046 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
676dac4b | 1047 | isp->smk_task = NULL; |
f59bdfba | 1048 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1049 | isp->smk_mmap = NULL; |
f59bdfba CS |
1050 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1051 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1052 | |
f59bdfba | 1053 | return 0; |
e114e473 CS |
1054 | } |
1055 | ||
1056 | /** | |
1057 | * smack_inode_getsecurity - get smack xattrs | |
1058 | * @inode: the object | |
1059 | * @name: attribute name | |
1060 | * @buffer: where to put the result | |
251a2a95 | 1061 | * @alloc: unused |
e114e473 CS |
1062 | * |
1063 | * Returns the size of the attribute or an error code | |
1064 | */ | |
1065 | static int smack_inode_getsecurity(const struct inode *inode, | |
1066 | const char *name, void **buffer, | |
1067 | bool alloc) | |
1068 | { | |
1069 | struct socket_smack *ssp; | |
1070 | struct socket *sock; | |
1071 | struct super_block *sbp; | |
1072 | struct inode *ip = (struct inode *)inode; | |
1073 | char *isp; | |
1074 | int ilen; | |
1075 | int rc = 0; | |
1076 | ||
1077 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1078 | isp = smk_of_inode(inode); | |
1079 | ilen = strlen(isp) + 1; | |
1080 | *buffer = isp; | |
1081 | return ilen; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * The rest of the Smack xattrs are only on sockets. | |
1086 | */ | |
1087 | sbp = ip->i_sb; | |
1088 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1089 | return -EOPNOTSUPP; | |
1090 | ||
1091 | sock = SOCKET_I(ip); | |
2e1d146a | 1092 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1093 | return -EOPNOTSUPP; |
1094 | ||
1095 | ssp = sock->sk->sk_security; | |
1096 | ||
1097 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 1098 | isp = ssp->smk_in->smk_known; |
e114e473 | 1099 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
2f823ff8 | 1100 | isp = ssp->smk_out->smk_known; |
e114e473 CS |
1101 | else |
1102 | return -EOPNOTSUPP; | |
1103 | ||
1104 | ilen = strlen(isp) + 1; | |
1105 | if (rc == 0) { | |
1106 | *buffer = isp; | |
1107 | rc = ilen; | |
1108 | } | |
1109 | ||
1110 | return rc; | |
1111 | } | |
1112 | ||
1113 | ||
1114 | /** | |
1115 | * smack_inode_listsecurity - list the Smack attributes | |
1116 | * @inode: the object | |
1117 | * @buffer: where they go | |
1118 | * @buffer_size: size of buffer | |
1119 | * | |
1120 | * Returns 0 on success, -EINVAL otherwise | |
1121 | */ | |
1122 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1123 | size_t buffer_size) | |
1124 | { | |
fd5c9d23 | 1125 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1126 | |
fd5c9d23 | 1127 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1128 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1129 | |
1130 | return len; | |
e114e473 CS |
1131 | } |
1132 | ||
d20bdda6 AD |
1133 | /** |
1134 | * smack_inode_getsecid - Extract inode's security id | |
1135 | * @inode: inode to extract the info from | |
1136 | * @secid: where result will be saved | |
1137 | */ | |
1138 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1139 | { | |
1140 | struct inode_smack *isp = inode->i_security; | |
1141 | ||
1142 | *secid = smack_to_secid(isp->smk_inode); | |
1143 | } | |
1144 | ||
e114e473 CS |
1145 | /* |
1146 | * File Hooks | |
1147 | */ | |
1148 | ||
1149 | /** | |
1150 | * smack_file_permission - Smack check on file operations | |
1151 | * @file: unused | |
1152 | * @mask: unused | |
1153 | * | |
1154 | * Returns 0 | |
1155 | * | |
1156 | * Should access checks be done on each read or write? | |
1157 | * UNICOS and SELinux say yes. | |
1158 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1159 | * | |
1160 | * I'll say no for now. Smack does not do the frequent | |
1161 | * label changing that SELinux does. | |
1162 | */ | |
1163 | static int smack_file_permission(struct file *file, int mask) | |
1164 | { | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * smack_file_alloc_security - assign a file security blob | |
1170 | * @file: the object | |
1171 | * | |
1172 | * The security blob for a file is a pointer to the master | |
1173 | * label list, so no allocation is done. | |
1174 | * | |
1175 | * Returns 0 | |
1176 | */ | |
1177 | static int smack_file_alloc_security(struct file *file) | |
1178 | { | |
2f823ff8 CS |
1179 | struct smack_known *skp = smk_of_current(); |
1180 | ||
1181 | file->f_security = skp->smk_known; | |
e114e473 CS |
1182 | return 0; |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * smack_file_free_security - clear a file security blob | |
1187 | * @file: the object | |
1188 | * | |
1189 | * The security blob for a file is a pointer to the master | |
1190 | * label list, so no memory is freed. | |
1191 | */ | |
1192 | static void smack_file_free_security(struct file *file) | |
1193 | { | |
1194 | file->f_security = NULL; | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * smack_file_ioctl - Smack check on ioctls | |
1199 | * @file: the object | |
1200 | * @cmd: what to do | |
1201 | * @arg: unused | |
1202 | * | |
1203 | * Relies heavily on the correct use of the ioctl command conventions. | |
1204 | * | |
1205 | * Returns 0 if allowed, error code otherwise | |
1206 | */ | |
1207 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1208 | unsigned long arg) | |
1209 | { | |
1210 | int rc = 0; | |
ecfcc53f EB |
1211 | struct smk_audit_info ad; |
1212 | ||
f48b7399 | 1213 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1214 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1215 | |
1216 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1217 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1218 | |
1219 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1220 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1221 | |
1222 | return rc; | |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * smack_file_lock - Smack check on file locking | |
1227 | * @file: the object | |
251a2a95 | 1228 | * @cmd: unused |
e114e473 | 1229 | * |
c0ab6e56 | 1230 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1231 | */ |
1232 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1233 | { | |
ecfcc53f EB |
1234 | struct smk_audit_info ad; |
1235 | ||
92f42509 EP |
1236 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1237 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c0ab6e56 | 1238 | return smk_curacc(file->f_security, MAY_LOCK, &ad); |
e114e473 CS |
1239 | } |
1240 | ||
1241 | /** | |
1242 | * smack_file_fcntl - Smack check on fcntl | |
1243 | * @file: the object | |
1244 | * @cmd: what action to check | |
1245 | * @arg: unused | |
1246 | * | |
531f1d45 CS |
1247 | * Generally these operations are harmless. |
1248 | * File locking operations present an obvious mechanism | |
1249 | * for passing information, so they require write access. | |
1250 | * | |
e114e473 CS |
1251 | * Returns 0 if current has access, error code otherwise |
1252 | */ | |
1253 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1254 | unsigned long arg) | |
1255 | { | |
ecfcc53f | 1256 | struct smk_audit_info ad; |
531f1d45 | 1257 | int rc = 0; |
e114e473 | 1258 | |
ecfcc53f | 1259 | |
e114e473 | 1260 | switch (cmd) { |
e114e473 | 1261 | case F_GETLK: |
c0ab6e56 | 1262 | break; |
e114e473 CS |
1263 | case F_SETLK: |
1264 | case F_SETLKW: | |
c0ab6e56 CS |
1265 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1266 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1267 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); | |
1268 | break; | |
e114e473 CS |
1269 | case F_SETOWN: |
1270 | case F_SETSIG: | |
531f1d45 CS |
1271 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1272 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1273 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1274 | break; |
1275 | default: | |
531f1d45 | 1276 | break; |
e114e473 CS |
1277 | } |
1278 | ||
1279 | return rc; | |
1280 | } | |
1281 | ||
7898e1f8 | 1282 | /** |
e5467859 | 1283 | * smack_mmap_file : |
7898e1f8 CS |
1284 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1285 | * if mapping anonymous memory. | |
1286 | * @file contains the file structure for file to map (may be NULL). | |
1287 | * @reqprot contains the protection requested by the application. | |
1288 | * @prot contains the protection that will be applied by the kernel. | |
1289 | * @flags contains the operational flags. | |
1290 | * Return 0 if permission is granted. | |
1291 | */ | |
e5467859 | 1292 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1293 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1294 | unsigned long flags) |
7898e1f8 | 1295 | { |
272cd7a8 | 1296 | struct smack_known *skp; |
2f823ff8 | 1297 | struct smack_known *mkp; |
7898e1f8 CS |
1298 | struct smack_rule *srp; |
1299 | struct task_smack *tsp; | |
0e0a070d | 1300 | char *osmack; |
7898e1f8 | 1301 | struct inode_smack *isp; |
0e0a070d CS |
1302 | int may; |
1303 | int mmay; | |
1304 | int tmay; | |
7898e1f8 CS |
1305 | int rc; |
1306 | ||
496ad9aa | 1307 | if (file == NULL) |
7898e1f8 CS |
1308 | return 0; |
1309 | ||
496ad9aa | 1310 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1311 | if (isp->smk_mmap == NULL) |
1312 | return 0; | |
2f823ff8 | 1313 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1314 | |
1315 | tsp = current_security(); | |
2f823ff8 | 1316 | skp = smk_of_current(); |
7898e1f8 CS |
1317 | rc = 0; |
1318 | ||
1319 | rcu_read_lock(); | |
1320 | /* | |
1321 | * For each Smack rule associated with the subject | |
1322 | * label verify that the SMACK64MMAP also has access | |
1323 | * to that rule's object label. | |
7898e1f8 | 1324 | */ |
272cd7a8 | 1325 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1326 | osmack = srp->smk_object; |
7898e1f8 CS |
1327 | /* |
1328 | * Matching labels always allows access. | |
1329 | */ | |
2f823ff8 | 1330 | if (mkp->smk_known == osmack) |
7898e1f8 | 1331 | continue; |
0e0a070d CS |
1332 | /* |
1333 | * If there is a matching local rule take | |
1334 | * that into account as well. | |
1335 | */ | |
2f823ff8 | 1336 | may = smk_access_entry(srp->smk_subject->smk_known, osmack, |
0e0a070d CS |
1337 | &tsp->smk_rules); |
1338 | if (may == -ENOENT) | |
1339 | may = srp->smk_access; | |
1340 | else | |
1341 | may &= srp->smk_access; | |
1342 | /* | |
1343 | * If may is zero the SMACK64MMAP subject can't | |
1344 | * possibly have less access. | |
1345 | */ | |
1346 | if (may == 0) | |
1347 | continue; | |
1348 | ||
1349 | /* | |
1350 | * Fetch the global list entry. | |
1351 | * If there isn't one a SMACK64MMAP subject | |
1352 | * can't have as much access as current. | |
1353 | */ | |
2f823ff8 CS |
1354 | mmay = smk_access_entry(mkp->smk_known, osmack, |
1355 | &mkp->smk_rules); | |
0e0a070d CS |
1356 | if (mmay == -ENOENT) { |
1357 | rc = -EACCES; | |
1358 | break; | |
1359 | } | |
1360 | /* | |
1361 | * If there is a local entry it modifies the | |
1362 | * potential access, too. | |
1363 | */ | |
2f823ff8 CS |
1364 | tmay = smk_access_entry(mkp->smk_known, osmack, |
1365 | &tsp->smk_rules); | |
0e0a070d CS |
1366 | if (tmay != -ENOENT) |
1367 | mmay &= tmay; | |
7898e1f8 | 1368 | |
0e0a070d CS |
1369 | /* |
1370 | * If there is any access available to current that is | |
1371 | * not available to a SMACK64MMAP subject | |
1372 | * deny access. | |
1373 | */ | |
75a25637 | 1374 | if ((may | mmay) != mmay) { |
0e0a070d | 1375 | rc = -EACCES; |
7898e1f8 | 1376 | break; |
0e0a070d | 1377 | } |
7898e1f8 CS |
1378 | } |
1379 | ||
1380 | rcu_read_unlock(); | |
1381 | ||
1382 | return rc; | |
1383 | } | |
1384 | ||
e114e473 CS |
1385 | /** |
1386 | * smack_file_set_fowner - set the file security blob value | |
1387 | * @file: object in question | |
1388 | * | |
1389 | * Returns 0 | |
1390 | * Further research may be required on this one. | |
1391 | */ | |
1392 | static int smack_file_set_fowner(struct file *file) | |
1393 | { | |
2f823ff8 CS |
1394 | struct smack_known *skp = smk_of_current(); |
1395 | ||
1396 | file->f_security = skp->smk_known; | |
e114e473 CS |
1397 | return 0; |
1398 | } | |
1399 | ||
1400 | /** | |
1401 | * smack_file_send_sigiotask - Smack on sigio | |
1402 | * @tsk: The target task | |
1403 | * @fown: the object the signal come from | |
1404 | * @signum: unused | |
1405 | * | |
1406 | * Allow a privileged task to get signals even if it shouldn't | |
1407 | * | |
1408 | * Returns 0 if a subject with the object's smack could | |
1409 | * write to the task, an error code otherwise. | |
1410 | */ | |
1411 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1412 | struct fown_struct *fown, int signum) | |
1413 | { | |
2f823ff8 CS |
1414 | struct smack_known *skp; |
1415 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1416 | struct file *file; |
1417 | int rc; | |
ecfcc53f | 1418 | struct smk_audit_info ad; |
e114e473 CS |
1419 | |
1420 | /* | |
1421 | * struct fown_struct is never outside the context of a struct file | |
1422 | */ | |
1423 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1424 | |
ecfcc53f | 1425 | /* we don't log here as rc can be overriden */ |
2f823ff8 CS |
1426 | skp = smk_find_entry(file->f_security); |
1427 | rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL); | |
5cd9c58f | 1428 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1429 | rc = 0; |
1430 | ||
1431 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1432 | smk_ad_setfield_u_tsk(&ad, tsk); | |
2f823ff8 | 1433 | smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1434 | return rc; |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * smack_file_receive - Smack file receive check | |
1439 | * @file: the object | |
1440 | * | |
1441 | * Returns 0 if current has access, error code otherwise | |
1442 | */ | |
1443 | static int smack_file_receive(struct file *file) | |
1444 | { | |
1445 | int may = 0; | |
ecfcc53f | 1446 | struct smk_audit_info ad; |
e114e473 | 1447 | |
4482a44f | 1448 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1449 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1450 | /* |
1451 | * This code relies on bitmasks. | |
1452 | */ | |
1453 | if (file->f_mode & FMODE_READ) | |
1454 | may = MAY_READ; | |
1455 | if (file->f_mode & FMODE_WRITE) | |
1456 | may |= MAY_WRITE; | |
1457 | ||
ecfcc53f | 1458 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1459 | } |
1460 | ||
531f1d45 | 1461 | /** |
83d49856 | 1462 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1463 | * @file: the object |
a6834c0b | 1464 | * @cred: task credential |
531f1d45 CS |
1465 | * |
1466 | * Set the security blob in the file structure. | |
a6834c0b CS |
1467 | * Allow the open only if the task has read access. There are |
1468 | * many read operations (e.g. fstat) that you can do with an | |
1469 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1470 | * |
1471 | * Returns 0 | |
1472 | */ | |
83d49856 | 1473 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1474 | { |
a6834c0b | 1475 | struct task_smack *tsp = cred->security; |
496ad9aa | 1476 | struct inode_smack *isp = file_inode(file)->i_security; |
a6834c0b CS |
1477 | struct smk_audit_info ad; |
1478 | int rc; | |
531f1d45 | 1479 | |
a6834c0b CS |
1480 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
1481 | return 0; | |
531f1d45 | 1482 | |
a6834c0b CS |
1483 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1484 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1485 | rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad); | |
1486 | if (rc == 0) | |
1487 | file->f_security = isp->smk_inode; | |
1488 | ||
1489 | return rc; | |
531f1d45 CS |
1490 | } |
1491 | ||
e114e473 CS |
1492 | /* |
1493 | * Task hooks | |
1494 | */ | |
1495 | ||
ee18d64c DH |
1496 | /** |
1497 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1498 | * @new: the new credentials | |
1499 | * @gfp: the atomicity of any memory allocations | |
1500 | * | |
1501 | * Prepare a blank set of credentials for modification. This must allocate all | |
1502 | * the memory the LSM module might require such that cred_transfer() can | |
1503 | * complete without error. | |
1504 | */ | |
1505 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1506 | { | |
7898e1f8 CS |
1507 | struct task_smack *tsp; |
1508 | ||
1509 | tsp = new_task_smack(NULL, NULL, gfp); | |
1510 | if (tsp == NULL) | |
676dac4b | 1511 | return -ENOMEM; |
7898e1f8 CS |
1512 | |
1513 | cred->security = tsp; | |
1514 | ||
ee18d64c DH |
1515 | return 0; |
1516 | } | |
1517 | ||
1518 | ||
e114e473 | 1519 | /** |
f1752eec DH |
1520 | * smack_cred_free - "free" task-level security credentials |
1521 | * @cred: the credentials in question | |
e114e473 | 1522 | * |
e114e473 | 1523 | */ |
f1752eec | 1524 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1525 | { |
7898e1f8 CS |
1526 | struct task_smack *tsp = cred->security; |
1527 | struct smack_rule *rp; | |
1528 | struct list_head *l; | |
1529 | struct list_head *n; | |
1530 | ||
1531 | if (tsp == NULL) | |
1532 | return; | |
1533 | cred->security = NULL; | |
1534 | ||
1535 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1536 | rp = list_entry(l, struct smack_rule, list); | |
1537 | list_del(&rp->list); | |
1538 | kfree(rp); | |
1539 | } | |
1540 | kfree(tsp); | |
e114e473 CS |
1541 | } |
1542 | ||
d84f4f99 DH |
1543 | /** |
1544 | * smack_cred_prepare - prepare new set of credentials for modification | |
1545 | * @new: the new credentials | |
1546 | * @old: the original credentials | |
1547 | * @gfp: the atomicity of any memory allocations | |
1548 | * | |
1549 | * Prepare a new set of credentials for modification. | |
1550 | */ | |
1551 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1552 | gfp_t gfp) | |
1553 | { | |
676dac4b CS |
1554 | struct task_smack *old_tsp = old->security; |
1555 | struct task_smack *new_tsp; | |
7898e1f8 | 1556 | int rc; |
676dac4b | 1557 | |
7898e1f8 | 1558 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1559 | if (new_tsp == NULL) |
1560 | return -ENOMEM; | |
1561 | ||
7898e1f8 CS |
1562 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1563 | if (rc != 0) | |
1564 | return rc; | |
1565 | ||
676dac4b | 1566 | new->security = new_tsp; |
d84f4f99 DH |
1567 | return 0; |
1568 | } | |
1569 | ||
ee18d64c DH |
1570 | /** |
1571 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1572 | * @new: the new credentials | |
1573 | * @old: the original credentials | |
1574 | * | |
1575 | * Fill in a set of blank credentials from another set of credentials. | |
1576 | */ | |
1577 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1578 | { | |
676dac4b CS |
1579 | struct task_smack *old_tsp = old->security; |
1580 | struct task_smack *new_tsp = new->security; | |
1581 | ||
1582 | new_tsp->smk_task = old_tsp->smk_task; | |
1583 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1584 | mutex_init(&new_tsp->smk_rules_lock); |
1585 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1586 | ||
1587 | ||
1588 | /* cbs copy rule list */ | |
ee18d64c DH |
1589 | } |
1590 | ||
3a3b7ce9 DH |
1591 | /** |
1592 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1593 | * @new: points to the set of credentials to be modified. |
1594 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1595 | * |
1596 | * Set the security data for a kernel service. | |
1597 | */ | |
1598 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1599 | { | |
676dac4b | 1600 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1601 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1602 | |
2f823ff8 | 1603 | if (skp == NULL) |
3a3b7ce9 DH |
1604 | return -EINVAL; |
1605 | ||
2f823ff8 | 1606 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1607 | return 0; |
1608 | } | |
1609 | ||
1610 | /** | |
1611 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1612 | * @new: points to the set of credentials to be modified |
1613 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1614 | * |
1615 | * Set the file creation context in a set of credentials to the same | |
1616 | * as the objective context of the specified inode | |
1617 | */ | |
1618 | static int smack_kernel_create_files_as(struct cred *new, | |
1619 | struct inode *inode) | |
1620 | { | |
1621 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1622 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1623 | |
2f823ff8 CS |
1624 | tsp->smk_forked = smk_find_entry(isp->smk_inode); |
1625 | tsp->smk_task = tsp->smk_forked; | |
3a3b7ce9 DH |
1626 | return 0; |
1627 | } | |
1628 | ||
ecfcc53f EB |
1629 | /** |
1630 | * smk_curacc_on_task - helper to log task related access | |
1631 | * @p: the task object | |
531f1d45 CS |
1632 | * @access: the access requested |
1633 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1634 | * |
1635 | * Return 0 if access is permitted | |
1636 | */ | |
531f1d45 CS |
1637 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1638 | const char *caller) | |
ecfcc53f EB |
1639 | { |
1640 | struct smk_audit_info ad; | |
2f823ff8 | 1641 | struct smack_known *skp = smk_of_task(task_security(p)); |
ecfcc53f | 1642 | |
531f1d45 | 1643 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1644 | smk_ad_setfield_u_tsk(&ad, p); |
2f823ff8 | 1645 | return smk_curacc(skp->smk_known, access, &ad); |
ecfcc53f EB |
1646 | } |
1647 | ||
e114e473 CS |
1648 | /** |
1649 | * smack_task_setpgid - Smack check on setting pgid | |
1650 | * @p: the task object | |
1651 | * @pgid: unused | |
1652 | * | |
1653 | * Return 0 if write access is permitted | |
1654 | */ | |
1655 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1656 | { | |
531f1d45 | 1657 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1658 | } |
1659 | ||
1660 | /** | |
1661 | * smack_task_getpgid - Smack access check for getpgid | |
1662 | * @p: the object task | |
1663 | * | |
1664 | * Returns 0 if current can read the object task, error code otherwise | |
1665 | */ | |
1666 | static int smack_task_getpgid(struct task_struct *p) | |
1667 | { | |
531f1d45 | 1668 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1669 | } |
1670 | ||
1671 | /** | |
1672 | * smack_task_getsid - Smack access check for getsid | |
1673 | * @p: the object task | |
1674 | * | |
1675 | * Returns 0 if current can read the object task, error code otherwise | |
1676 | */ | |
1677 | static int smack_task_getsid(struct task_struct *p) | |
1678 | { | |
531f1d45 | 1679 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1680 | } |
1681 | ||
1682 | /** | |
1683 | * smack_task_getsecid - get the secid of the task | |
1684 | * @p: the object task | |
1685 | * @secid: where to put the result | |
1686 | * | |
1687 | * Sets the secid to contain a u32 version of the smack label. | |
1688 | */ | |
1689 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1690 | { | |
2f823ff8 CS |
1691 | struct smack_known *skp = smk_of_task(task_security(p)); |
1692 | ||
1693 | *secid = skp->smk_secid; | |
e114e473 CS |
1694 | } |
1695 | ||
1696 | /** | |
1697 | * smack_task_setnice - Smack check on setting nice | |
1698 | * @p: the task object | |
1699 | * @nice: unused | |
1700 | * | |
1701 | * Return 0 if write access is permitted | |
1702 | */ | |
1703 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1704 | { | |
bcdca225 CS |
1705 | int rc; |
1706 | ||
1707 | rc = cap_task_setnice(p, nice); | |
1708 | if (rc == 0) | |
531f1d45 | 1709 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1710 | return rc; |
e114e473 CS |
1711 | } |
1712 | ||
1713 | /** | |
1714 | * smack_task_setioprio - Smack check on setting ioprio | |
1715 | * @p: the task object | |
1716 | * @ioprio: unused | |
1717 | * | |
1718 | * Return 0 if write access is permitted | |
1719 | */ | |
1720 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1721 | { | |
bcdca225 CS |
1722 | int rc; |
1723 | ||
1724 | rc = cap_task_setioprio(p, ioprio); | |
1725 | if (rc == 0) | |
531f1d45 | 1726 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1727 | return rc; |
e114e473 CS |
1728 | } |
1729 | ||
1730 | /** | |
1731 | * smack_task_getioprio - Smack check on reading ioprio | |
1732 | * @p: the task object | |
1733 | * | |
1734 | * Return 0 if read access is permitted | |
1735 | */ | |
1736 | static int smack_task_getioprio(struct task_struct *p) | |
1737 | { | |
531f1d45 | 1738 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1739 | } |
1740 | ||
1741 | /** | |
1742 | * smack_task_setscheduler - Smack check on setting scheduler | |
1743 | * @p: the task object | |
1744 | * @policy: unused | |
1745 | * @lp: unused | |
1746 | * | |
1747 | * Return 0 if read access is permitted | |
1748 | */ | |
b0ae1981 | 1749 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1750 | { |
bcdca225 CS |
1751 | int rc; |
1752 | ||
b0ae1981 | 1753 | rc = cap_task_setscheduler(p); |
bcdca225 | 1754 | if (rc == 0) |
531f1d45 | 1755 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1756 | return rc; |
e114e473 CS |
1757 | } |
1758 | ||
1759 | /** | |
1760 | * smack_task_getscheduler - Smack check on reading scheduler | |
1761 | * @p: the task object | |
1762 | * | |
1763 | * Return 0 if read access is permitted | |
1764 | */ | |
1765 | static int smack_task_getscheduler(struct task_struct *p) | |
1766 | { | |
531f1d45 | 1767 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1768 | } |
1769 | ||
1770 | /** | |
1771 | * smack_task_movememory - Smack check on moving memory | |
1772 | * @p: the task object | |
1773 | * | |
1774 | * Return 0 if write access is permitted | |
1775 | */ | |
1776 | static int smack_task_movememory(struct task_struct *p) | |
1777 | { | |
531f1d45 | 1778 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1779 | } |
1780 | ||
1781 | /** | |
1782 | * smack_task_kill - Smack check on signal delivery | |
1783 | * @p: the task object | |
1784 | * @info: unused | |
1785 | * @sig: unused | |
1786 | * @secid: identifies the smack to use in lieu of current's | |
1787 | * | |
1788 | * Return 0 if write access is permitted | |
1789 | * | |
1790 | * The secid behavior is an artifact of an SELinux hack | |
1791 | * in the USB code. Someday it may go away. | |
1792 | */ | |
1793 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1794 | int sig, u32 secid) | |
1795 | { | |
ecfcc53f | 1796 | struct smk_audit_info ad; |
2f823ff8 CS |
1797 | struct smack_known *skp; |
1798 | struct smack_known *tkp = smk_of_task(task_security(p)); | |
ecfcc53f EB |
1799 | |
1800 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1801 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1802 | /* |
1803 | * Sending a signal requires that the sender | |
1804 | * can write the receiver. | |
1805 | */ | |
1806 | if (secid == 0) | |
2f823ff8 | 1807 | return smk_curacc(tkp->smk_known, MAY_WRITE, &ad); |
e114e473 CS |
1808 | /* |
1809 | * If the secid isn't 0 we're dealing with some USB IO | |
1810 | * specific behavior. This is not clean. For one thing | |
1811 | * we can't take privilege into account. | |
1812 | */ | |
2f823ff8 CS |
1813 | skp = smack_from_secid(secid); |
1814 | return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad); | |
e114e473 CS |
1815 | } |
1816 | ||
1817 | /** | |
1818 | * smack_task_wait - Smack access check for waiting | |
1819 | * @p: task to wait for | |
1820 | * | |
c00bedb3 | 1821 | * Returns 0 |
e114e473 CS |
1822 | */ |
1823 | static int smack_task_wait(struct task_struct *p) | |
1824 | { | |
e114e473 | 1825 | /* |
c00bedb3 CS |
1826 | * Allow the operation to succeed. |
1827 | * Zombies are bad. | |
1828 | * In userless environments (e.g. phones) programs | |
1829 | * get marked with SMACK64EXEC and even if the parent | |
1830 | * and child shouldn't be talking the parent still | |
1831 | * may expect to know when the child exits. | |
e114e473 | 1832 | */ |
c00bedb3 | 1833 | return 0; |
e114e473 CS |
1834 | } |
1835 | ||
1836 | /** | |
1837 | * smack_task_to_inode - copy task smack into the inode blob | |
1838 | * @p: task to copy from | |
251a2a95 | 1839 | * @inode: inode to copy to |
e114e473 CS |
1840 | * |
1841 | * Sets the smack pointer in the inode security blob | |
1842 | */ | |
1843 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1844 | { | |
1845 | struct inode_smack *isp = inode->i_security; | |
2f823ff8 CS |
1846 | struct smack_known *skp = smk_of_task(task_security(p)); |
1847 | ||
1848 | isp->smk_inode = skp->smk_known; | |
e114e473 CS |
1849 | } |
1850 | ||
1851 | /* | |
1852 | * Socket hooks. | |
1853 | */ | |
1854 | ||
1855 | /** | |
1856 | * smack_sk_alloc_security - Allocate a socket blob | |
1857 | * @sk: the socket | |
1858 | * @family: unused | |
251a2a95 | 1859 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1860 | * |
1861 | * Assign Smack pointers to current | |
1862 | * | |
1863 | * Returns 0 on success, -ENOMEM is there's no memory | |
1864 | */ | |
1865 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1866 | { | |
2f823ff8 | 1867 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
1868 | struct socket_smack *ssp; |
1869 | ||
1870 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1871 | if (ssp == NULL) | |
1872 | return -ENOMEM; | |
1873 | ||
54e70ec5 | 1874 | ssp->smk_in = skp; |
2f823ff8 | 1875 | ssp->smk_out = skp; |
272cd7a8 | 1876 | ssp->smk_packet = NULL; |
e114e473 CS |
1877 | |
1878 | sk->sk_security = ssp; | |
1879 | ||
1880 | return 0; | |
1881 | } | |
1882 | ||
1883 | /** | |
1884 | * smack_sk_free_security - Free a socket blob | |
1885 | * @sk: the socket | |
1886 | * | |
1887 | * Clears the blob pointer | |
1888 | */ | |
1889 | static void smack_sk_free_security(struct sock *sk) | |
1890 | { | |
1891 | kfree(sk->sk_security); | |
1892 | } | |
1893 | ||
07feee8f PM |
1894 | /** |
1895 | * smack_host_label - check host based restrictions | |
1896 | * @sip: the object end | |
1897 | * | |
1898 | * looks for host based access restrictions | |
1899 | * | |
1900 | * This version will only be appropriate for really small sets of single label | |
1901 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1902 | * taken before calling this function. | |
1903 | * | |
1904 | * Returns the label of the far end or NULL if it's not special. | |
1905 | */ | |
1906 | static char *smack_host_label(struct sockaddr_in *sip) | |
1907 | { | |
1908 | struct smk_netlbladdr *snp; | |
1909 | struct in_addr *siap = &sip->sin_addr; | |
1910 | ||
1911 | if (siap->s_addr == 0) | |
1912 | return NULL; | |
1913 | ||
1914 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1915 | /* | |
1916 | * we break after finding the first match because | |
1917 | * the list is sorted from longest to shortest mask | |
1918 | * so we have found the most specific match | |
1919 | */ | |
1920 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1921 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1922 | /* we have found the special CIPSO option */ | |
1923 | if (snp->smk_label == smack_cipso_option) | |
1924 | return NULL; | |
07feee8f | 1925 | return snp->smk_label; |
4303154e | 1926 | } |
07feee8f PM |
1927 | |
1928 | return NULL; | |
1929 | } | |
1930 | ||
e114e473 CS |
1931 | /** |
1932 | * smack_netlabel - Set the secattr on a socket | |
1933 | * @sk: the socket | |
6d3dc07c | 1934 | * @labeled: socket label scheme |
e114e473 CS |
1935 | * |
1936 | * Convert the outbound smack value (smk_out) to a | |
1937 | * secattr and attach it to the socket. | |
1938 | * | |
1939 | * Returns 0 on success or an error code | |
1940 | */ | |
6d3dc07c | 1941 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1942 | { |
f7112e6c | 1943 | struct smack_known *skp; |
07feee8f | 1944 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 1945 | int rc = 0; |
e114e473 | 1946 | |
6d3dc07c CS |
1947 | /* |
1948 | * Usually the netlabel code will handle changing the | |
1949 | * packet labeling based on the label. | |
1950 | * The case of a single label host is different, because | |
1951 | * a single label host should never get a labeled packet | |
1952 | * even though the label is usually associated with a packet | |
1953 | * label. | |
1954 | */ | |
1955 | local_bh_disable(); | |
1956 | bh_lock_sock_nested(sk); | |
1957 | ||
1958 | if (ssp->smk_out == smack_net_ambient || | |
1959 | labeled == SMACK_UNLABELED_SOCKET) | |
1960 | netlbl_sock_delattr(sk); | |
1961 | else { | |
2f823ff8 | 1962 | skp = ssp->smk_out; |
f7112e6c | 1963 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
1964 | } |
1965 | ||
1966 | bh_unlock_sock(sk); | |
1967 | local_bh_enable(); | |
4bc87e62 | 1968 | |
e114e473 CS |
1969 | return rc; |
1970 | } | |
1971 | ||
07feee8f PM |
1972 | /** |
1973 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1974 | * @sk: the socket | |
1975 | * @sap: the destination address | |
1976 | * | |
1977 | * Set the correct secattr for the given socket based on the destination | |
1978 | * address and perform any outbound access checks needed. | |
1979 | * | |
1980 | * Returns 0 on success or an error code. | |
1981 | * | |
1982 | */ | |
1983 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1984 | { | |
2f823ff8 | 1985 | struct smack_known *skp; |
07feee8f PM |
1986 | int rc; |
1987 | int sk_lbl; | |
1988 | char *hostsp; | |
1989 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1990 | struct smk_audit_info ad; |
07feee8f PM |
1991 | |
1992 | rcu_read_lock(); | |
1993 | hostsp = smack_host_label(sap); | |
1994 | if (hostsp != NULL) { | |
ecfcc53f | 1995 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
1996 | struct lsm_network_audit net; |
1997 | ||
48c62af6 EP |
1998 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
1999 | ad.a.u.net->family = sap->sin_family; | |
2000 | ad.a.u.net->dport = sap->sin_port; | |
2001 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2002 | #endif |
923e9a13 | 2003 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 CS |
2004 | skp = ssp->smk_out; |
2005 | rc = smk_access(skp, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
2006 | } else { |
2007 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2008 | rc = 0; | |
2009 | } | |
2010 | rcu_read_unlock(); | |
2011 | if (rc != 0) | |
2012 | return rc; | |
2013 | ||
2014 | return smack_netlabel(sk, sk_lbl); | |
2015 | } | |
2016 | ||
c6739443 CS |
2017 | /** |
2018 | * smk_ipv6_port_label - Smack port access table management | |
2019 | * @sock: socket | |
2020 | * @address: address | |
2021 | * | |
2022 | * Create or update the port list entry | |
2023 | */ | |
2024 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2025 | { | |
2026 | struct sock *sk = sock->sk; | |
2027 | struct sockaddr_in6 *addr6; | |
2028 | struct socket_smack *ssp = sock->sk->sk_security; | |
2029 | struct smk_port_label *spp; | |
2030 | unsigned short port = 0; | |
2031 | ||
2032 | if (address == NULL) { | |
2033 | /* | |
2034 | * This operation is changing the Smack information | |
2035 | * on the bound socket. Take the changes to the port | |
2036 | * as well. | |
2037 | */ | |
2038 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2039 | if (sk != spp->smk_sock) | |
2040 | continue; | |
2041 | spp->smk_in = ssp->smk_in; | |
2042 | spp->smk_out = ssp->smk_out; | |
2043 | return; | |
2044 | } | |
2045 | /* | |
2046 | * A NULL address is only used for updating existing | |
2047 | * bound entries. If there isn't one, it's OK. | |
2048 | */ | |
2049 | return; | |
2050 | } | |
2051 | ||
2052 | addr6 = (struct sockaddr_in6 *)address; | |
2053 | port = ntohs(addr6->sin6_port); | |
2054 | /* | |
2055 | * This is a special case that is safely ignored. | |
2056 | */ | |
2057 | if (port == 0) | |
2058 | return; | |
2059 | ||
2060 | /* | |
2061 | * Look for an existing port list entry. | |
2062 | * This is an indication that a port is getting reused. | |
2063 | */ | |
2064 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2065 | if (spp->smk_port != port) | |
2066 | continue; | |
2067 | spp->smk_port = port; | |
2068 | spp->smk_sock = sk; | |
2069 | spp->smk_in = ssp->smk_in; | |
2070 | spp->smk_out = ssp->smk_out; | |
2071 | return; | |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * A new port entry is required. | |
2076 | */ | |
2077 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2078 | if (spp == NULL) | |
2079 | return; | |
2080 | ||
2081 | spp->smk_port = port; | |
2082 | spp->smk_sock = sk; | |
2083 | spp->smk_in = ssp->smk_in; | |
2084 | spp->smk_out = ssp->smk_out; | |
2085 | ||
2086 | list_add(&spp->list, &smk_ipv6_port_list); | |
2087 | return; | |
2088 | } | |
2089 | ||
2090 | /** | |
2091 | * smk_ipv6_port_check - check Smack port access | |
2092 | * @sock: socket | |
2093 | * @address: address | |
2094 | * | |
2095 | * Create or update the port list entry | |
2096 | */ | |
6ea06247 | 2097 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2098 | int act) |
2099 | { | |
2100 | __be16 *bep; | |
2101 | __be32 *be32p; | |
c6739443 CS |
2102 | struct smk_port_label *spp; |
2103 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 2104 | struct smack_known *skp; |
c6739443 | 2105 | unsigned short port = 0; |
c6739443 CS |
2106 | char *object; |
2107 | struct smk_audit_info ad; | |
2108 | #ifdef CONFIG_AUDIT | |
2109 | struct lsm_network_audit net; | |
2110 | #endif | |
2111 | ||
2112 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2113 | skp = smack_net_ambient; |
54e70ec5 | 2114 | object = ssp->smk_in->smk_known; |
c6739443 | 2115 | } else { |
2f823ff8 CS |
2116 | skp = ssp->smk_out; |
2117 | object = smack_net_ambient->smk_known; | |
c6739443 CS |
2118 | } |
2119 | ||
2120 | /* | |
2121 | * Get the IP address and port from the address. | |
2122 | */ | |
6ea06247 CS |
2123 | port = ntohs(address->sin6_port); |
2124 | bep = (__be16 *)(&address->sin6_addr); | |
2125 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2126 | |
2127 | /* | |
2128 | * It's remote, so port lookup does no good. | |
2129 | */ | |
2130 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2131 | goto auditout; | |
2132 | ||
2133 | /* | |
2134 | * It's local so the send check has to have passed. | |
2135 | */ | |
2136 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2137 | skp = &smack_known_web; |
c6739443 CS |
2138 | goto auditout; |
2139 | } | |
2140 | ||
2141 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2142 | if (spp->smk_port != port) | |
2143 | continue; | |
54e70ec5 | 2144 | object = spp->smk_in->smk_known; |
c6739443 | 2145 | if (act == SMK_CONNECTING) |
54e70ec5 | 2146 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2147 | break; |
2148 | } | |
2149 | ||
2150 | auditout: | |
2151 | ||
2152 | #ifdef CONFIG_AUDIT | |
2153 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2154 | ad.a.u.net->family = sk->sk_family; | |
2155 | ad.a.u.net->dport = port; | |
2156 | if (act == SMK_RECEIVING) | |
6ea06247 | 2157 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2158 | else |
6ea06247 | 2159 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2160 | #endif |
2f823ff8 | 2161 | return smk_access(skp, object, MAY_WRITE, &ad); |
c6739443 CS |
2162 | } |
2163 | ||
e114e473 CS |
2164 | /** |
2165 | * smack_inode_setsecurity - set smack xattrs | |
2166 | * @inode: the object | |
2167 | * @name: attribute name | |
2168 | * @value: attribute value | |
2169 | * @size: size of the attribute | |
2170 | * @flags: unused | |
2171 | * | |
2172 | * Sets the named attribute in the appropriate blob | |
2173 | * | |
2174 | * Returns 0 on success, or an error code | |
2175 | */ | |
2176 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2177 | const void *value, size_t size, int flags) | |
2178 | { | |
2f823ff8 | 2179 | struct smack_known *skp; |
e114e473 CS |
2180 | struct inode_smack *nsp = inode->i_security; |
2181 | struct socket_smack *ssp; | |
2182 | struct socket *sock; | |
4bc87e62 | 2183 | int rc = 0; |
e114e473 | 2184 | |
f7112e6c | 2185 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2186 | return -EINVAL; |
e114e473 | 2187 | |
2f823ff8 CS |
2188 | skp = smk_import_entry(value, size); |
2189 | if (skp == NULL) | |
e114e473 CS |
2190 | return -EINVAL; |
2191 | ||
2192 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
2f823ff8 | 2193 | nsp->smk_inode = skp->smk_known; |
ddd29ec6 | 2194 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2195 | return 0; |
2196 | } | |
2197 | /* | |
2198 | * The rest of the Smack xattrs are only on sockets. | |
2199 | */ | |
2200 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2201 | return -EOPNOTSUPP; | |
2202 | ||
2203 | sock = SOCKET_I(inode); | |
2e1d146a | 2204 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2205 | return -EOPNOTSUPP; |
2206 | ||
2207 | ssp = sock->sk->sk_security; | |
2208 | ||
2209 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2210 | ssp->smk_in = skp; |
e114e473 | 2211 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2212 | ssp->smk_out = skp; |
c6739443 | 2213 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2214 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2215 | if (rc != 0) | |
2216 | printk(KERN_WARNING | |
2217 | "Smack: \"%s\" netlbl error %d.\n", | |
2218 | __func__, -rc); | |
2219 | } | |
e114e473 CS |
2220 | } else |
2221 | return -EOPNOTSUPP; | |
2222 | ||
c6739443 CS |
2223 | if (sock->sk->sk_family == PF_INET6) |
2224 | smk_ipv6_port_label(sock, NULL); | |
2225 | ||
e114e473 CS |
2226 | return 0; |
2227 | } | |
2228 | ||
2229 | /** | |
2230 | * smack_socket_post_create - finish socket setup | |
2231 | * @sock: the socket | |
2232 | * @family: protocol family | |
2233 | * @type: unused | |
2234 | * @protocol: unused | |
2235 | * @kern: unused | |
2236 | * | |
2237 | * Sets the netlabel information on the socket | |
2238 | * | |
2239 | * Returns 0 on success, and error code otherwise | |
2240 | */ | |
2241 | static int smack_socket_post_create(struct socket *sock, int family, | |
2242 | int type, int protocol, int kern) | |
2243 | { | |
2e1d146a | 2244 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2245 | return 0; |
2246 | /* | |
2247 | * Set the outbound netlbl. | |
2248 | */ | |
6d3dc07c CS |
2249 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2250 | } | |
2251 | ||
c6739443 CS |
2252 | /** |
2253 | * smack_socket_bind - record port binding information. | |
2254 | * @sock: the socket | |
2255 | * @address: the port address | |
2256 | * @addrlen: size of the address | |
2257 | * | |
2258 | * Records the label bound to a port. | |
2259 | * | |
2260 | * Returns 0 | |
2261 | */ | |
2262 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2263 | int addrlen) | |
2264 | { | |
2265 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2266 | smk_ipv6_port_label(sock, address); | |
2267 | ||
2268 | return 0; | |
2269 | } | |
2270 | ||
6d3dc07c CS |
2271 | /** |
2272 | * smack_socket_connect - connect access check | |
2273 | * @sock: the socket | |
2274 | * @sap: the other end | |
2275 | * @addrlen: size of sap | |
2276 | * | |
2277 | * Verifies that a connection may be possible | |
2278 | * | |
2279 | * Returns 0 on success, and error code otherwise | |
2280 | */ | |
2281 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2282 | int addrlen) | |
2283 | { | |
c6739443 CS |
2284 | int rc = 0; |
2285 | ||
2286 | if (sock->sk == NULL) | |
6d3dc07c | 2287 | return 0; |
6d3dc07c | 2288 | |
c6739443 CS |
2289 | switch (sock->sk->sk_family) { |
2290 | case PF_INET: | |
2291 | if (addrlen < sizeof(struct sockaddr_in)) | |
2292 | return -EINVAL; | |
2293 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2294 | break; | |
2295 | case PF_INET6: | |
2296 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2297 | return -EINVAL; | |
6ea06247 CS |
2298 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2299 | SMK_CONNECTING); | |
c6739443 CS |
2300 | break; |
2301 | } | |
2302 | return rc; | |
e114e473 CS |
2303 | } |
2304 | ||
2305 | /** | |
2306 | * smack_flags_to_may - convert S_ to MAY_ values | |
2307 | * @flags: the S_ value | |
2308 | * | |
2309 | * Returns the equivalent MAY_ value | |
2310 | */ | |
2311 | static int smack_flags_to_may(int flags) | |
2312 | { | |
2313 | int may = 0; | |
2314 | ||
2315 | if (flags & S_IRUGO) | |
2316 | may |= MAY_READ; | |
2317 | if (flags & S_IWUGO) | |
2318 | may |= MAY_WRITE; | |
2319 | if (flags & S_IXUGO) | |
2320 | may |= MAY_EXEC; | |
2321 | ||
2322 | return may; | |
2323 | } | |
2324 | ||
2325 | /** | |
2326 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2327 | * @msg: the object | |
2328 | * | |
2329 | * Returns 0 | |
2330 | */ | |
2331 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2332 | { | |
2f823ff8 CS |
2333 | struct smack_known *skp = smk_of_current(); |
2334 | ||
2335 | msg->security = skp->smk_known; | |
e114e473 CS |
2336 | return 0; |
2337 | } | |
2338 | ||
2339 | /** | |
2340 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2341 | * @msg: the object | |
2342 | * | |
2343 | * Clears the blob pointer | |
2344 | */ | |
2345 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2346 | { | |
2347 | msg->security = NULL; | |
2348 | } | |
2349 | ||
2350 | /** | |
2351 | * smack_of_shm - the smack pointer for the shm | |
2352 | * @shp: the object | |
2353 | * | |
2354 | * Returns a pointer to the smack value | |
2355 | */ | |
2356 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2357 | { | |
2358 | return (char *)shp->shm_perm.security; | |
2359 | } | |
2360 | ||
2361 | /** | |
2362 | * smack_shm_alloc_security - Set the security blob for shm | |
2363 | * @shp: the object | |
2364 | * | |
2365 | * Returns 0 | |
2366 | */ | |
2367 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2368 | { | |
2369 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2370 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2371 | |
2f823ff8 | 2372 | isp->security = skp->smk_known; |
e114e473 CS |
2373 | return 0; |
2374 | } | |
2375 | ||
2376 | /** | |
2377 | * smack_shm_free_security - Clear the security blob for shm | |
2378 | * @shp: the object | |
2379 | * | |
2380 | * Clears the blob pointer | |
2381 | */ | |
2382 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2383 | { | |
2384 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2385 | ||
2386 | isp->security = NULL; | |
2387 | } | |
2388 | ||
ecfcc53f EB |
2389 | /** |
2390 | * smk_curacc_shm : check if current has access on shm | |
2391 | * @shp : the object | |
2392 | * @access : access requested | |
2393 | * | |
2394 | * Returns 0 if current has the requested access, error code otherwise | |
2395 | */ | |
2396 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2397 | { | |
2398 | char *ssp = smack_of_shm(shp); | |
2399 | struct smk_audit_info ad; | |
2400 | ||
2401 | #ifdef CONFIG_AUDIT | |
2402 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2403 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2404 | #endif | |
2405 | return smk_curacc(ssp, access, &ad); | |
2406 | } | |
2407 | ||
e114e473 CS |
2408 | /** |
2409 | * smack_shm_associate - Smack access check for shm | |
2410 | * @shp: the object | |
2411 | * @shmflg: access requested | |
2412 | * | |
2413 | * Returns 0 if current has the requested access, error code otherwise | |
2414 | */ | |
2415 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2416 | { | |
e114e473 CS |
2417 | int may; |
2418 | ||
2419 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2420 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2421 | } |
2422 | ||
2423 | /** | |
2424 | * smack_shm_shmctl - Smack access check for shm | |
2425 | * @shp: the object | |
2426 | * @cmd: what it wants to do | |
2427 | * | |
2428 | * Returns 0 if current has the requested access, error code otherwise | |
2429 | */ | |
2430 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2431 | { | |
e114e473 CS |
2432 | int may; |
2433 | ||
2434 | switch (cmd) { | |
2435 | case IPC_STAT: | |
2436 | case SHM_STAT: | |
2437 | may = MAY_READ; | |
2438 | break; | |
2439 | case IPC_SET: | |
2440 | case SHM_LOCK: | |
2441 | case SHM_UNLOCK: | |
2442 | case IPC_RMID: | |
2443 | may = MAY_READWRITE; | |
2444 | break; | |
2445 | case IPC_INFO: | |
2446 | case SHM_INFO: | |
2447 | /* | |
2448 | * System level information. | |
2449 | */ | |
2450 | return 0; | |
2451 | default: | |
2452 | return -EINVAL; | |
2453 | } | |
ecfcc53f | 2454 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2455 | } |
2456 | ||
2457 | /** | |
2458 | * smack_shm_shmat - Smack access for shmat | |
2459 | * @shp: the object | |
2460 | * @shmaddr: unused | |
2461 | * @shmflg: access requested | |
2462 | * | |
2463 | * Returns 0 if current has the requested access, error code otherwise | |
2464 | */ | |
2465 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2466 | int shmflg) | |
2467 | { | |
e114e473 CS |
2468 | int may; |
2469 | ||
2470 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2471 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2472 | } |
2473 | ||
2474 | /** | |
2475 | * smack_of_sem - the smack pointer for the sem | |
2476 | * @sma: the object | |
2477 | * | |
2478 | * Returns a pointer to the smack value | |
2479 | */ | |
2480 | static char *smack_of_sem(struct sem_array *sma) | |
2481 | { | |
2482 | return (char *)sma->sem_perm.security; | |
2483 | } | |
2484 | ||
2485 | /** | |
2486 | * smack_sem_alloc_security - Set the security blob for sem | |
2487 | * @sma: the object | |
2488 | * | |
2489 | * Returns 0 | |
2490 | */ | |
2491 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2492 | { | |
2493 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2494 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2495 | |
2f823ff8 | 2496 | isp->security = skp->smk_known; |
e114e473 CS |
2497 | return 0; |
2498 | } | |
2499 | ||
2500 | /** | |
2501 | * smack_sem_free_security - Clear the security blob for sem | |
2502 | * @sma: the object | |
2503 | * | |
2504 | * Clears the blob pointer | |
2505 | */ | |
2506 | static void smack_sem_free_security(struct sem_array *sma) | |
2507 | { | |
2508 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2509 | ||
2510 | isp->security = NULL; | |
2511 | } | |
2512 | ||
ecfcc53f EB |
2513 | /** |
2514 | * smk_curacc_sem : check if current has access on sem | |
2515 | * @sma : the object | |
2516 | * @access : access requested | |
2517 | * | |
2518 | * Returns 0 if current has the requested access, error code otherwise | |
2519 | */ | |
2520 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2521 | { | |
2522 | char *ssp = smack_of_sem(sma); | |
2523 | struct smk_audit_info ad; | |
2524 | ||
2525 | #ifdef CONFIG_AUDIT | |
2526 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2527 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2528 | #endif | |
2529 | return smk_curacc(ssp, access, &ad); | |
2530 | } | |
2531 | ||
e114e473 CS |
2532 | /** |
2533 | * smack_sem_associate - Smack access check for sem | |
2534 | * @sma: the object | |
2535 | * @semflg: access requested | |
2536 | * | |
2537 | * Returns 0 if current has the requested access, error code otherwise | |
2538 | */ | |
2539 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2540 | { | |
e114e473 CS |
2541 | int may; |
2542 | ||
2543 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2544 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2545 | } |
2546 | ||
2547 | /** | |
2548 | * smack_sem_shmctl - Smack access check for sem | |
2549 | * @sma: the object | |
2550 | * @cmd: what it wants to do | |
2551 | * | |
2552 | * Returns 0 if current has the requested access, error code otherwise | |
2553 | */ | |
2554 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2555 | { | |
e114e473 CS |
2556 | int may; |
2557 | ||
2558 | switch (cmd) { | |
2559 | case GETPID: | |
2560 | case GETNCNT: | |
2561 | case GETZCNT: | |
2562 | case GETVAL: | |
2563 | case GETALL: | |
2564 | case IPC_STAT: | |
2565 | case SEM_STAT: | |
2566 | may = MAY_READ; | |
2567 | break; | |
2568 | case SETVAL: | |
2569 | case SETALL: | |
2570 | case IPC_RMID: | |
2571 | case IPC_SET: | |
2572 | may = MAY_READWRITE; | |
2573 | break; | |
2574 | case IPC_INFO: | |
2575 | case SEM_INFO: | |
2576 | /* | |
2577 | * System level information | |
2578 | */ | |
2579 | return 0; | |
2580 | default: | |
2581 | return -EINVAL; | |
2582 | } | |
2583 | ||
ecfcc53f | 2584 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2585 | } |
2586 | ||
2587 | /** | |
2588 | * smack_sem_semop - Smack checks of semaphore operations | |
2589 | * @sma: the object | |
2590 | * @sops: unused | |
2591 | * @nsops: unused | |
2592 | * @alter: unused | |
2593 | * | |
2594 | * Treated as read and write in all cases. | |
2595 | * | |
2596 | * Returns 0 if access is allowed, error code otherwise | |
2597 | */ | |
2598 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2599 | unsigned nsops, int alter) | |
2600 | { | |
ecfcc53f | 2601 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2602 | } |
2603 | ||
2604 | /** | |
2605 | * smack_msg_alloc_security - Set the security blob for msg | |
2606 | * @msq: the object | |
2607 | * | |
2608 | * Returns 0 | |
2609 | */ | |
2610 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2611 | { | |
2612 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2613 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2614 | |
2f823ff8 | 2615 | kisp->security = skp->smk_known; |
e114e473 CS |
2616 | return 0; |
2617 | } | |
2618 | ||
2619 | /** | |
2620 | * smack_msg_free_security - Clear the security blob for msg | |
2621 | * @msq: the object | |
2622 | * | |
2623 | * Clears the blob pointer | |
2624 | */ | |
2625 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2626 | { | |
2627 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2628 | ||
2629 | kisp->security = NULL; | |
2630 | } | |
2631 | ||
2632 | /** | |
2633 | * smack_of_msq - the smack pointer for the msq | |
2634 | * @msq: the object | |
2635 | * | |
2636 | * Returns a pointer to the smack value | |
2637 | */ | |
2638 | static char *smack_of_msq(struct msg_queue *msq) | |
2639 | { | |
2640 | return (char *)msq->q_perm.security; | |
2641 | } | |
2642 | ||
ecfcc53f EB |
2643 | /** |
2644 | * smk_curacc_msq : helper to check if current has access on msq | |
2645 | * @msq : the msq | |
2646 | * @access : access requested | |
2647 | * | |
2648 | * return 0 if current has access, error otherwise | |
2649 | */ | |
2650 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2651 | { | |
2652 | char *msp = smack_of_msq(msq); | |
2653 | struct smk_audit_info ad; | |
2654 | ||
2655 | #ifdef CONFIG_AUDIT | |
2656 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2657 | ad.a.u.ipc_id = msq->q_perm.id; | |
2658 | #endif | |
2659 | return smk_curacc(msp, access, &ad); | |
2660 | } | |
2661 | ||
e114e473 CS |
2662 | /** |
2663 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2664 | * @msq: the object | |
2665 | * @msqflg: access requested | |
2666 | * | |
2667 | * Returns 0 if current has the requested access, error code otherwise | |
2668 | */ | |
2669 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2670 | { | |
e114e473 CS |
2671 | int may; |
2672 | ||
2673 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2674 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2675 | } |
2676 | ||
2677 | /** | |
2678 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2679 | * @msq: the object | |
2680 | * @cmd: what it wants to do | |
2681 | * | |
2682 | * Returns 0 if current has the requested access, error code otherwise | |
2683 | */ | |
2684 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2685 | { | |
e114e473 CS |
2686 | int may; |
2687 | ||
2688 | switch (cmd) { | |
2689 | case IPC_STAT: | |
2690 | case MSG_STAT: | |
2691 | may = MAY_READ; | |
2692 | break; | |
2693 | case IPC_SET: | |
2694 | case IPC_RMID: | |
2695 | may = MAY_READWRITE; | |
2696 | break; | |
2697 | case IPC_INFO: | |
2698 | case MSG_INFO: | |
2699 | /* | |
2700 | * System level information | |
2701 | */ | |
2702 | return 0; | |
2703 | default: | |
2704 | return -EINVAL; | |
2705 | } | |
2706 | ||
ecfcc53f | 2707 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2708 | } |
2709 | ||
2710 | /** | |
2711 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2712 | * @msq: the object | |
2713 | * @msg: unused | |
2714 | * @msqflg: access requested | |
2715 | * | |
2716 | * Returns 0 if current has the requested access, error code otherwise | |
2717 | */ | |
2718 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2719 | int msqflg) | |
2720 | { | |
ecfcc53f | 2721 | int may; |
e114e473 | 2722 | |
ecfcc53f EB |
2723 | may = smack_flags_to_may(msqflg); |
2724 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2725 | } |
2726 | ||
2727 | /** | |
2728 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2729 | * @msq: the object | |
2730 | * @msg: unused | |
2731 | * @target: unused | |
2732 | * @type: unused | |
2733 | * @mode: unused | |
2734 | * | |
2735 | * Returns 0 if current has read and write access, error code otherwise | |
2736 | */ | |
2737 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2738 | struct task_struct *target, long type, int mode) | |
2739 | { | |
ecfcc53f | 2740 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2741 | } |
2742 | ||
2743 | /** | |
2744 | * smack_ipc_permission - Smack access for ipc_permission() | |
2745 | * @ipp: the object permissions | |
2746 | * @flag: access requested | |
2747 | * | |
2748 | * Returns 0 if current has read and write access, error code otherwise | |
2749 | */ | |
2750 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2751 | { | |
2752 | char *isp = ipp->security; | |
ecfcc53f EB |
2753 | int may = smack_flags_to_may(flag); |
2754 | struct smk_audit_info ad; | |
e114e473 | 2755 | |
ecfcc53f EB |
2756 | #ifdef CONFIG_AUDIT |
2757 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2758 | ad.a.u.ipc_id = ipp->id; | |
2759 | #endif | |
2760 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2761 | } |
2762 | ||
d20bdda6 AD |
2763 | /** |
2764 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2765 | * @ipp: the object permissions |
d20bdda6 AD |
2766 | * @secid: where result will be saved |
2767 | */ | |
2768 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2769 | { | |
2770 | char *smack = ipp->security; | |
2771 | ||
2772 | *secid = smack_to_secid(smack); | |
2773 | } | |
2774 | ||
e114e473 CS |
2775 | /** |
2776 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2777 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2778 | * @inode: the object |
2779 | * | |
2780 | * Set the inode's security blob if it hasn't been done already. | |
2781 | */ | |
2782 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2783 | { | |
2784 | struct super_block *sbp; | |
2785 | struct superblock_smack *sbsp; | |
2786 | struct inode_smack *isp; | |
2f823ff8 CS |
2787 | struct smack_known *skp; |
2788 | struct smack_known *ckp = smk_of_current(); | |
e114e473 | 2789 | char *final; |
5c6d1125 JS |
2790 | char trattr[TRANS_TRUE_SIZE]; |
2791 | int transflag = 0; | |
2267b13a | 2792 | int rc; |
e114e473 CS |
2793 | struct dentry *dp; |
2794 | ||
2795 | if (inode == NULL) | |
2796 | return; | |
2797 | ||
2798 | isp = inode->i_security; | |
2799 | ||
2800 | mutex_lock(&isp->smk_lock); | |
2801 | /* | |
2802 | * If the inode is already instantiated | |
2803 | * take the quick way out | |
2804 | */ | |
2805 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2806 | goto unlockandout; | |
2807 | ||
2808 | sbp = inode->i_sb; | |
2809 | sbsp = sbp->s_security; | |
2810 | /* | |
2811 | * We're going to use the superblock default label | |
2812 | * if there's no label on the file. | |
2813 | */ | |
2814 | final = sbsp->smk_default; | |
2815 | ||
e97dcb0e CS |
2816 | /* |
2817 | * If this is the root inode the superblock | |
2818 | * may be in the process of initialization. | |
2819 | * If that is the case use the root value out | |
2820 | * of the superblock. | |
2821 | */ | |
2822 | if (opt_dentry->d_parent == opt_dentry) { | |
36ea735b CS |
2823 | if (sbp->s_magic == CGROUP_SUPER_MAGIC) { |
2824 | /* | |
2825 | * The cgroup filesystem is never mounted, | |
2826 | * so there's no opportunity to set the mount | |
2827 | * options. | |
2828 | */ | |
2829 | sbsp->smk_root = smack_known_star.smk_known; | |
2830 | sbsp->smk_default = smack_known_star.smk_known; | |
2831 | } | |
e97dcb0e CS |
2832 | isp->smk_inode = sbsp->smk_root; |
2833 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2834 | goto unlockandout; | |
2835 | } | |
2836 | ||
e114e473 CS |
2837 | /* |
2838 | * This is pretty hackish. | |
2839 | * Casey says that we shouldn't have to do | |
2840 | * file system specific code, but it does help | |
2841 | * with keeping it simple. | |
2842 | */ | |
2843 | switch (sbp->s_magic) { | |
2844 | case SMACK_MAGIC: | |
36ea735b CS |
2845 | case PIPEFS_MAGIC: |
2846 | case SOCKFS_MAGIC: | |
2847 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 2848 | /* |
25985edc | 2849 | * Casey says that it's a little embarrassing |
e114e473 CS |
2850 | * that the smack file system doesn't do |
2851 | * extended attributes. | |
36ea735b | 2852 | * |
e114e473 | 2853 | * Casey says pipes are easy (?) |
36ea735b CS |
2854 | * |
2855 | * Socket access is controlled by the socket | |
2856 | * structures associated with the task involved. | |
2857 | * | |
2858 | * Cgroupfs is special | |
e114e473 CS |
2859 | */ |
2860 | final = smack_known_star.smk_known; | |
2861 | break; | |
2862 | case DEVPTS_SUPER_MAGIC: | |
2863 | /* | |
2864 | * devpts seems content with the label of the task. | |
2865 | * Programs that change smack have to treat the | |
2866 | * pty with respect. | |
2867 | */ | |
2f823ff8 | 2868 | final = ckp->smk_known; |
e114e473 | 2869 | break; |
e114e473 CS |
2870 | case PROC_SUPER_MAGIC: |
2871 | /* | |
2872 | * Casey says procfs appears not to care. | |
2873 | * The superblock default suffices. | |
2874 | */ | |
2875 | break; | |
2876 | case TMPFS_MAGIC: | |
2877 | /* | |
2878 | * Device labels should come from the filesystem, | |
2879 | * but watch out, because they're volitile, | |
2880 | * getting recreated on every reboot. | |
2881 | */ | |
2882 | final = smack_known_star.smk_known; | |
2883 | /* | |
2884 | * No break. | |
2885 | * | |
2886 | * If a smack value has been set we want to use it, | |
2887 | * but since tmpfs isn't giving us the opportunity | |
2888 | * to set mount options simulate setting the | |
2889 | * superblock default. | |
2890 | */ | |
2891 | default: | |
2892 | /* | |
2893 | * This isn't an understood special case. | |
2894 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2895 | */ |
2896 | ||
2897 | /* | |
2898 | * UNIX domain sockets use lower level socket data. | |
2899 | */ | |
2900 | if (S_ISSOCK(inode->i_mode)) { | |
2901 | final = smack_known_star.smk_known; | |
2902 | break; | |
2903 | } | |
2904 | /* | |
e114e473 CS |
2905 | * No xattr support means, alas, no SMACK label. |
2906 | * Use the aforeapplied default. | |
2907 | * It would be curious if the label of the task | |
2908 | * does not match that assigned. | |
2909 | */ | |
2910 | if (inode->i_op->getxattr == NULL) | |
2911 | break; | |
2912 | /* | |
2913 | * Get the dentry for xattr. | |
2914 | */ | |
3e62cbb8 | 2915 | dp = dget(opt_dentry); |
2f823ff8 CS |
2916 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
2917 | if (skp != NULL) | |
2918 | final = skp->smk_known; | |
2267b13a CS |
2919 | |
2920 | /* | |
2921 | * Transmuting directory | |
2922 | */ | |
2923 | if (S_ISDIR(inode->i_mode)) { | |
2924 | /* | |
2925 | * If this is a new directory and the label was | |
2926 | * transmuted when the inode was initialized | |
2927 | * set the transmute attribute on the directory | |
2928 | * and mark the inode. | |
2929 | * | |
2930 | * If there is a transmute attribute on the | |
2931 | * directory mark the inode. | |
2932 | */ | |
2933 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
2934 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
2935 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 2936 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
2937 | TRANS_TRUE, TRANS_TRUE_SIZE, |
2938 | 0); | |
2939 | } else { | |
2940 | rc = inode->i_op->getxattr(dp, | |
2941 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
2942 | TRANS_TRUE_SIZE); | |
2943 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
2944 | TRANS_TRUE_SIZE) != 0) | |
2945 | rc = -EINVAL; | |
5c6d1125 | 2946 | } |
2267b13a CS |
2947 | if (rc >= 0) |
2948 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 2949 | } |
19760ad0 CS |
2950 | /* |
2951 | * Don't let the exec or mmap label be "*" or "@". | |
2952 | */ | |
2953 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
2954 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2955 | skp = NULL; | |
2956 | isp->smk_task = skp; | |
2957 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); | |
2958 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2959 | skp = NULL; | |
2960 | isp->smk_mmap = skp; | |
676dac4b | 2961 | |
e114e473 CS |
2962 | dput(dp); |
2963 | break; | |
2964 | } | |
2965 | ||
2966 | if (final == NULL) | |
2f823ff8 | 2967 | isp->smk_inode = ckp->smk_known; |
e114e473 CS |
2968 | else |
2969 | isp->smk_inode = final; | |
2970 | ||
5c6d1125 | 2971 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2972 | |
2973 | unlockandout: | |
2974 | mutex_unlock(&isp->smk_lock); | |
2975 | return; | |
2976 | } | |
2977 | ||
2978 | /** | |
2979 | * smack_getprocattr - Smack process attribute access | |
2980 | * @p: the object task | |
2981 | * @name: the name of the attribute in /proc/.../attr | |
2982 | * @value: where to put the result | |
2983 | * | |
2984 | * Places a copy of the task Smack into value | |
2985 | * | |
2986 | * Returns the length of the smack label or an error code | |
2987 | */ | |
2988 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2989 | { | |
2f823ff8 | 2990 | struct smack_known *skp = smk_of_task(task_security(p)); |
e114e473 CS |
2991 | char *cp; |
2992 | int slen; | |
2993 | ||
2994 | if (strcmp(name, "current") != 0) | |
2995 | return -EINVAL; | |
2996 | ||
2f823ff8 | 2997 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
2998 | if (cp == NULL) |
2999 | return -ENOMEM; | |
3000 | ||
3001 | slen = strlen(cp); | |
3002 | *value = cp; | |
3003 | return slen; | |
3004 | } | |
3005 | ||
3006 | /** | |
3007 | * smack_setprocattr - Smack process attribute setting | |
3008 | * @p: the object task | |
3009 | * @name: the name of the attribute in /proc/.../attr | |
3010 | * @value: the value to set | |
3011 | * @size: the size of the value | |
3012 | * | |
3013 | * Sets the Smack value of the task. Only setting self | |
3014 | * is permitted and only with privilege | |
3015 | * | |
3016 | * Returns the length of the smack label or an error code | |
3017 | */ | |
3018 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3019 | void *value, size_t size) | |
3020 | { | |
676dac4b | 3021 | struct task_smack *tsp; |
d84f4f99 | 3022 | struct cred *new; |
2f823ff8 | 3023 | struct smack_known *skp; |
e114e473 | 3024 | |
e114e473 CS |
3025 | /* |
3026 | * Changing another process' Smack value is too dangerous | |
3027 | * and supports no sane use case. | |
3028 | */ | |
3029 | if (p != current) | |
3030 | return -EPERM; | |
3031 | ||
1880eff7 | 3032 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3033 | return -EPERM; |
3034 | ||
f7112e6c | 3035 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3036 | return -EINVAL; |
3037 | ||
3038 | if (strcmp(name, "current") != 0) | |
3039 | return -EINVAL; | |
3040 | ||
2f823ff8 CS |
3041 | skp = smk_import_entry(value, size); |
3042 | if (skp == NULL) | |
e114e473 CS |
3043 | return -EINVAL; |
3044 | ||
6d3dc07c CS |
3045 | /* |
3046 | * No process is ever allowed the web ("@") label. | |
3047 | */ | |
2f823ff8 | 3048 | if (skp == &smack_known_web) |
6d3dc07c CS |
3049 | return -EPERM; |
3050 | ||
d84f4f99 | 3051 | new = prepare_creds(); |
6d3dc07c | 3052 | if (new == NULL) |
d84f4f99 | 3053 | return -ENOMEM; |
7898e1f8 | 3054 | |
46a2f3b9 | 3055 | tsp = new->security; |
2f823ff8 | 3056 | tsp->smk_task = skp; |
7898e1f8 | 3057 | |
d84f4f99 | 3058 | commit_creds(new); |
e114e473 CS |
3059 | return size; |
3060 | } | |
3061 | ||
3062 | /** | |
3063 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3064 | * @sock: one sock |
3065 | * @other: the other sock | |
e114e473 CS |
3066 | * @newsk: unused |
3067 | * | |
3068 | * Return 0 if a subject with the smack of sock could access | |
3069 | * an object with the smack of other, otherwise an error code | |
3070 | */ | |
3610cda5 DM |
3071 | static int smack_unix_stream_connect(struct sock *sock, |
3072 | struct sock *other, struct sock *newsk) | |
e114e473 | 3073 | { |
2f823ff8 | 3074 | struct smack_known *skp; |
54e70ec5 | 3075 | struct smack_known *okp; |
d2e7ad19 JM |
3076 | struct socket_smack *ssp = sock->sk_security; |
3077 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3078 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3079 | struct smk_audit_info ad; |
b4e0d5f0 | 3080 | int rc = 0; |
923e9a13 KC |
3081 | #ifdef CONFIG_AUDIT |
3082 | struct lsm_network_audit net; | |
923e9a13 | 3083 | #endif |
b4e0d5f0 | 3084 | |
2f823ff8 CS |
3085 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3086 | skp = ssp->smk_out; | |
54e70ec5 CS |
3087 | okp = osp->smk_out; |
3088 | #ifdef CONFIG_AUDIT | |
3089 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3090 | smk_ad_setfield_u_net_sk(&ad, other); | |
3091 | #endif | |
3092 | rc = smk_access(skp, okp->smk_known, MAY_WRITE, &ad); | |
3093 | if (rc == 0) | |
3094 | rc = smk_access(okp, okp->smk_known, MAY_WRITE, NULL); | |
2f823ff8 | 3095 | } |
b4e0d5f0 | 3096 | |
975d5e55 CS |
3097 | /* |
3098 | * Cross reference the peer labels for SO_PEERSEC. | |
3099 | */ | |
3100 | if (rc == 0) { | |
54e70ec5 CS |
3101 | nsp->smk_packet = ssp->smk_out; |
3102 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3103 | } |
3104 | ||
b4e0d5f0 | 3105 | return rc; |
e114e473 CS |
3106 | } |
3107 | ||
3108 | /** | |
3109 | * smack_unix_may_send - Smack access on UDS | |
3110 | * @sock: one socket | |
3111 | * @other: the other socket | |
3112 | * | |
3113 | * Return 0 if a subject with the smack of sock could access | |
3114 | * an object with the smack of other, otherwise an error code | |
3115 | */ | |
3116 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3117 | { | |
b4e0d5f0 CS |
3118 | struct socket_smack *ssp = sock->sk->sk_security; |
3119 | struct socket_smack *osp = other->sk->sk_security; | |
2f823ff8 | 3120 | struct smack_known *skp; |
ecfcc53f | 3121 | struct smk_audit_info ad; |
e114e473 | 3122 | |
923e9a13 KC |
3123 | #ifdef CONFIG_AUDIT |
3124 | struct lsm_network_audit net; | |
3125 | ||
48c62af6 | 3126 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3127 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3128 | #endif |
b4e0d5f0 | 3129 | |
2f823ff8 CS |
3130 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3131 | return 0; | |
b4e0d5f0 | 3132 | |
2f823ff8 | 3133 | skp = ssp->smk_out; |
54e70ec5 | 3134 | return smk_access(skp, osp->smk_in->smk_known, MAY_WRITE, &ad); |
e114e473 CS |
3135 | } |
3136 | ||
6d3dc07c CS |
3137 | /** |
3138 | * smack_socket_sendmsg - Smack check based on destination host | |
3139 | * @sock: the socket | |
251a2a95 | 3140 | * @msg: the message |
6d3dc07c CS |
3141 | * @size: the size of the message |
3142 | * | |
c6739443 CS |
3143 | * Return 0 if the current subject can write to the destination host. |
3144 | * For IPv4 this is only a question if the destination is a single label host. | |
3145 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3146 | */ |
3147 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3148 | int size) | |
3149 | { | |
3150 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6ea06247 | 3151 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
c6739443 | 3152 | int rc = 0; |
6d3dc07c CS |
3153 | |
3154 | /* | |
3155 | * Perfectly reasonable for this to be NULL | |
3156 | */ | |
c6739443 | 3157 | if (sip == NULL) |
6d3dc07c CS |
3158 | return 0; |
3159 | ||
c6739443 CS |
3160 | switch (sip->sin_family) { |
3161 | case AF_INET: | |
3162 | rc = smack_netlabel_send(sock->sk, sip); | |
3163 | break; | |
3164 | case AF_INET6: | |
3165 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); | |
3166 | break; | |
3167 | } | |
3168 | return rc; | |
6d3dc07c CS |
3169 | } |
3170 | ||
e114e473 | 3171 | /** |
251a2a95 | 3172 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3173 | * @sap: netlabel secattr |
272cd7a8 | 3174 | * @ssp: socket security information |
e114e473 | 3175 | * |
2f823ff8 | 3176 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3177 | */ |
2f823ff8 CS |
3178 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3179 | struct socket_smack *ssp) | |
e114e473 | 3180 | { |
2f823ff8 | 3181 | struct smack_known *skp; |
f7112e6c | 3182 | int found = 0; |
677264e8 CS |
3183 | int acat; |
3184 | int kcat; | |
e114e473 | 3185 | |
6d3dc07c | 3186 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3187 | /* |
6d3dc07c | 3188 | * Looks like a CIPSO packet. |
e114e473 CS |
3189 | * If there are flags but no level netlabel isn't |
3190 | * behaving the way we expect it to. | |
3191 | * | |
f7112e6c | 3192 | * Look it up in the label table |
e114e473 CS |
3193 | * Without guidance regarding the smack value |
3194 | * for the packet fall back on the network | |
3195 | * ambient value. | |
3196 | */ | |
f7112e6c | 3197 | rcu_read_lock(); |
2f823ff8 CS |
3198 | list_for_each_entry(skp, &smack_known_list, list) { |
3199 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3200 | continue; |
677264e8 CS |
3201 | /* |
3202 | * Compare the catsets. Use the netlbl APIs. | |
3203 | */ | |
3204 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3205 | if ((skp->smk_netlabel.flags & | |
3206 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3207 | found = 1; | |
3208 | break; | |
3209 | } | |
3210 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3211 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3212 | acat + 1); | |
3213 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3214 | skp->smk_netlabel.attr.mls.cat, |
3215 | kcat + 1); | |
3216 | if (acat < 0 || kcat < 0) | |
3217 | break; | |
3218 | } | |
3219 | if (acat == kcat) { | |
3220 | found = 1; | |
3221 | break; | |
3222 | } | |
6d3dc07c | 3223 | } |
f7112e6c CS |
3224 | rcu_read_unlock(); |
3225 | ||
3226 | if (found) | |
2f823ff8 | 3227 | return skp; |
f7112e6c | 3228 | |
54e70ec5 | 3229 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3230 | return &smack_known_web; |
3231 | return &smack_known_star; | |
e114e473 | 3232 | } |
6d3dc07c CS |
3233 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3234 | /* | |
3235 | * Looks like a fallback, which gives us a secid. | |
3236 | */ | |
2f823ff8 | 3237 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3238 | /* |
3239 | * This has got to be a bug because it is | |
3240 | * impossible to specify a fallback without | |
3241 | * specifying the label, which will ensure | |
3242 | * it has a secid, and the only way to get a | |
3243 | * secid is from a fallback. | |
3244 | */ | |
2f823ff8 CS |
3245 | BUG_ON(skp == NULL); |
3246 | return skp; | |
e114e473 CS |
3247 | } |
3248 | /* | |
6d3dc07c CS |
3249 | * Without guidance regarding the smack value |
3250 | * for the packet fall back on the network | |
3251 | * ambient value. | |
e114e473 | 3252 | */ |
272cd7a8 | 3253 | return smack_net_ambient; |
e114e473 CS |
3254 | } |
3255 | ||
6ea06247 | 3256 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3257 | { |
c6739443 CS |
3258 | u8 nexthdr; |
3259 | int offset; | |
3260 | int proto = -EINVAL; | |
3261 | struct ipv6hdr _ipv6h; | |
3262 | struct ipv6hdr *ip6; | |
3263 | __be16 frag_off; | |
3264 | struct tcphdr _tcph, *th; | |
3265 | struct udphdr _udph, *uh; | |
3266 | struct dccp_hdr _dccph, *dh; | |
3267 | ||
3268 | sip->sin6_port = 0; | |
3269 | ||
3270 | offset = skb_network_offset(skb); | |
3271 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3272 | if (ip6 == NULL) | |
3273 | return -EINVAL; | |
3274 | sip->sin6_addr = ip6->saddr; | |
3275 | ||
3276 | nexthdr = ip6->nexthdr; | |
3277 | offset += sizeof(_ipv6h); | |
3278 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3279 | if (offset < 0) | |
3280 | return -EINVAL; | |
3281 | ||
3282 | proto = nexthdr; | |
3283 | switch (proto) { | |
3284 | case IPPROTO_TCP: | |
3285 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3286 | if (th != NULL) | |
3287 | sip->sin6_port = th->source; | |
3288 | break; | |
3289 | case IPPROTO_UDP: | |
3290 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3291 | if (uh != NULL) | |
3292 | sip->sin6_port = uh->source; | |
3293 | break; | |
3294 | case IPPROTO_DCCP: | |
3295 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3296 | if (dh != NULL) | |
3297 | sip->sin6_port = dh->dccph_sport; | |
3298 | break; | |
3299 | } | |
3300 | return proto; | |
3301 | } | |
3302 | ||
e114e473 CS |
3303 | /** |
3304 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3305 | * @sk: socket | |
3306 | * @skb: packet | |
3307 | * | |
3308 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3309 | */ | |
3310 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3311 | { | |
3312 | struct netlbl_lsm_secattr secattr; | |
3313 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3314 | struct smack_known *skp; |
6ea06247 | 3315 | struct sockaddr_in6 sadd; |
c6739443 | 3316 | int rc = 0; |
ecfcc53f | 3317 | struct smk_audit_info ad; |
923e9a13 | 3318 | #ifdef CONFIG_AUDIT |
48c62af6 | 3319 | struct lsm_network_audit net; |
923e9a13 | 3320 | #endif |
c6739443 CS |
3321 | switch (sk->sk_family) { |
3322 | case PF_INET: | |
3323 | /* | |
3324 | * Translate what netlabel gave us. | |
3325 | */ | |
3326 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3327 | |
c6739443 CS |
3328 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3329 | if (rc == 0) | |
2f823ff8 | 3330 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3331 | else |
2f823ff8 | 3332 | skp = smack_net_ambient; |
6d3dc07c | 3333 | |
c6739443 | 3334 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3335 | |
ecfcc53f | 3336 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3337 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3338 | ad.a.u.net->family = sk->sk_family; | |
3339 | ad.a.u.net->netif = skb->skb_iif; | |
3340 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3341 | #endif |
c6739443 CS |
3342 | /* |
3343 | * Receiving a packet requires that the other end | |
3344 | * be able to write here. Read access is not required. | |
3345 | * This is the simplist possible security model | |
3346 | * for networking. | |
3347 | */ | |
54e70ec5 | 3348 | rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad); |
c6739443 CS |
3349 | if (rc != 0) |
3350 | netlbl_skbuff_err(skb, rc, 0); | |
3351 | break; | |
3352 | case PF_INET6: | |
3353 | rc = smk_skb_to_addr_ipv6(skb, &sadd); | |
3354 | if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) | |
3355 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3356 | else | |
3357 | rc = 0; | |
3358 | break; | |
3359 | } | |
a8134296 | 3360 | return rc; |
e114e473 CS |
3361 | } |
3362 | ||
3363 | /** | |
3364 | * smack_socket_getpeersec_stream - pull in packet label | |
3365 | * @sock: the socket | |
3366 | * @optval: user's destination | |
3367 | * @optlen: size thereof | |
251a2a95 | 3368 | * @len: max thereof |
e114e473 CS |
3369 | * |
3370 | * returns zero on success, an error code otherwise | |
3371 | */ | |
3372 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3373 | char __user *optval, | |
3374 | int __user *optlen, unsigned len) | |
3375 | { | |
3376 | struct socket_smack *ssp; | |
272cd7a8 CS |
3377 | char *rcp = ""; |
3378 | int slen = 1; | |
e114e473 CS |
3379 | int rc = 0; |
3380 | ||
3381 | ssp = sock->sk->sk_security; | |
272cd7a8 | 3382 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 3383 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
3384 | slen = strlen(rcp) + 1; |
3385 | } | |
e114e473 CS |
3386 | |
3387 | if (slen > len) | |
3388 | rc = -ERANGE; | |
272cd7a8 | 3389 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3390 | rc = -EFAULT; |
3391 | ||
3392 | if (put_user(slen, optlen) != 0) | |
3393 | rc = -EFAULT; | |
3394 | ||
3395 | return rc; | |
3396 | } | |
3397 | ||
3398 | ||
3399 | /** | |
3400 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3401 | * @sock: the peer socket |
e114e473 CS |
3402 | * @skb: packet data |
3403 | * @secid: pointer to where to put the secid of the packet | |
3404 | * | |
3405 | * Sets the netlabel socket state on sk from parent | |
3406 | */ | |
3407 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3408 | struct sk_buff *skb, u32 *secid) | |
3409 | ||
3410 | { | |
3411 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3412 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3413 | struct smack_known *skp; |
b4e0d5f0 CS |
3414 | int family = PF_UNSPEC; |
3415 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3416 | int rc; |
3417 | ||
b4e0d5f0 CS |
3418 | if (skb != NULL) { |
3419 | if (skb->protocol == htons(ETH_P_IP)) | |
3420 | family = PF_INET; | |
3421 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3422 | family = PF_INET6; | |
e114e473 | 3423 | } |
b4e0d5f0 CS |
3424 | if (family == PF_UNSPEC && sock != NULL) |
3425 | family = sock->sk->sk_family; | |
e114e473 | 3426 | |
b4e0d5f0 | 3427 | if (family == PF_UNIX) { |
272cd7a8 | 3428 | ssp = sock->sk->sk_security; |
2f823ff8 | 3429 | s = ssp->smk_out->smk_secid; |
b4e0d5f0 CS |
3430 | } else if (family == PF_INET || family == PF_INET6) { |
3431 | /* | |
3432 | * Translate what netlabel gave us. | |
3433 | */ | |
272cd7a8 CS |
3434 | if (sock != NULL && sock->sk != NULL) |
3435 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3436 | netlbl_secattr_init(&secattr); |
3437 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3438 | if (rc == 0) { | |
2f823ff8 CS |
3439 | skp = smack_from_secattr(&secattr, ssp); |
3440 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3441 | } |
3442 | netlbl_secattr_destroy(&secattr); | |
3443 | } | |
3444 | *secid = s; | |
e114e473 CS |
3445 | if (s == 0) |
3446 | return -EINVAL; | |
e114e473 CS |
3447 | return 0; |
3448 | } | |
3449 | ||
3450 | /** | |
07feee8f PM |
3451 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3452 | * @sk: child sock | |
3453 | * @parent: parent socket | |
e114e473 | 3454 | * |
07feee8f PM |
3455 | * Set the smk_{in,out} state of an existing sock based on the process that |
3456 | * is creating the new socket. | |
e114e473 CS |
3457 | */ |
3458 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3459 | { | |
3460 | struct socket_smack *ssp; | |
2f823ff8 | 3461 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3462 | |
07feee8f PM |
3463 | if (sk == NULL || |
3464 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3465 | return; |
3466 | ||
3467 | ssp = sk->sk_security; | |
54e70ec5 | 3468 | ssp->smk_in = skp; |
2f823ff8 | 3469 | ssp->smk_out = skp; |
07feee8f | 3470 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3471 | } |
3472 | ||
3473 | /** | |
3474 | * smack_inet_conn_request - Smack access check on connect | |
3475 | * @sk: socket involved | |
3476 | * @skb: packet | |
3477 | * @req: unused | |
3478 | * | |
3479 | * Returns 0 if a task with the packet label could write to | |
3480 | * the socket, otherwise an error code | |
3481 | */ | |
3482 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3483 | struct request_sock *req) | |
3484 | { | |
07feee8f | 3485 | u16 family = sk->sk_family; |
f7112e6c | 3486 | struct smack_known *skp; |
e114e473 | 3487 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3488 | struct netlbl_lsm_secattr secattr; |
3489 | struct sockaddr_in addr; | |
3490 | struct iphdr *hdr; | |
f7112e6c | 3491 | char *hsp; |
e114e473 | 3492 | int rc; |
ecfcc53f | 3493 | struct smk_audit_info ad; |
923e9a13 | 3494 | #ifdef CONFIG_AUDIT |
48c62af6 | 3495 | struct lsm_network_audit net; |
923e9a13 | 3496 | #endif |
e114e473 | 3497 | |
c6739443 CS |
3498 | if (family == PF_INET6) { |
3499 | /* | |
3500 | * Handle mapped IPv4 packets arriving | |
3501 | * via IPv6 sockets. Don't set up netlabel | |
3502 | * processing on IPv6. | |
3503 | */ | |
3504 | if (skb->protocol == htons(ETH_P_IP)) | |
3505 | family = PF_INET; | |
3506 | else | |
3507 | return 0; | |
3508 | } | |
e114e473 | 3509 | |
07feee8f PM |
3510 | netlbl_secattr_init(&secattr); |
3511 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3512 | if (rc == 0) |
2f823ff8 | 3513 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3514 | else |
2f823ff8 | 3515 | skp = &smack_known_huh; |
07feee8f PM |
3516 | netlbl_secattr_destroy(&secattr); |
3517 | ||
ecfcc53f | 3518 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3519 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3520 | ad.a.u.net->family = family; | |
3521 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3522 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3523 | #endif | |
e114e473 | 3524 | /* |
07feee8f PM |
3525 | * Receiving a packet requires that the other end be able to write |
3526 | * here. Read access is not required. | |
e114e473 | 3527 | */ |
54e70ec5 | 3528 | rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad); |
07feee8f PM |
3529 | if (rc != 0) |
3530 | return rc; | |
3531 | ||
3532 | /* | |
3533 | * Save the peer's label in the request_sock so we can later setup | |
3534 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3535 | */ | |
2f823ff8 | 3536 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3537 | |
3538 | /* | |
3539 | * We need to decide if we want to label the incoming connection here | |
3540 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3541 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3542 | */ |
3543 | hdr = ip_hdr(skb); | |
3544 | addr.sin_addr.s_addr = hdr->saddr; | |
3545 | rcu_read_lock(); | |
f7112e6c CS |
3546 | hsp = smack_host_label(&addr); |
3547 | rcu_read_unlock(); | |
3548 | ||
2f823ff8 | 3549 | if (hsp == NULL) |
f7112e6c | 3550 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3551 | else |
07feee8f | 3552 | netlbl_req_delattr(req); |
e114e473 CS |
3553 | |
3554 | return rc; | |
3555 | } | |
3556 | ||
07feee8f PM |
3557 | /** |
3558 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3559 | * @sk: the new socket | |
3560 | * @req: the connection's request_sock | |
3561 | * | |
3562 | * Transfer the connection's peer label to the newly created socket. | |
3563 | */ | |
3564 | static void smack_inet_csk_clone(struct sock *sk, | |
3565 | const struct request_sock *req) | |
3566 | { | |
3567 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3568 | struct smack_known *skp; |
07feee8f | 3569 | |
2f823ff8 CS |
3570 | if (req->peer_secid != 0) { |
3571 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 3572 | ssp->smk_packet = skp; |
2f823ff8 | 3573 | } else |
272cd7a8 | 3574 | ssp->smk_packet = NULL; |
07feee8f PM |
3575 | } |
3576 | ||
e114e473 CS |
3577 | /* |
3578 | * Key management security hooks | |
3579 | * | |
3580 | * Casey has not tested key support very heavily. | |
3581 | * The permission check is most likely too restrictive. | |
3582 | * If you care about keys please have a look. | |
3583 | */ | |
3584 | #ifdef CONFIG_KEYS | |
3585 | ||
3586 | /** | |
3587 | * smack_key_alloc - Set the key security blob | |
3588 | * @key: object | |
d84f4f99 | 3589 | * @cred: the credentials to use |
e114e473 CS |
3590 | * @flags: unused |
3591 | * | |
3592 | * No allocation required | |
3593 | * | |
3594 | * Returns 0 | |
3595 | */ | |
d84f4f99 | 3596 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3597 | unsigned long flags) |
3598 | { | |
2f823ff8 CS |
3599 | struct smack_known *skp = smk_of_task(cred->security); |
3600 | ||
3601 | key->security = skp->smk_known; | |
e114e473 CS |
3602 | return 0; |
3603 | } | |
3604 | ||
3605 | /** | |
3606 | * smack_key_free - Clear the key security blob | |
3607 | * @key: the object | |
3608 | * | |
3609 | * Clear the blob pointer | |
3610 | */ | |
3611 | static void smack_key_free(struct key *key) | |
3612 | { | |
3613 | key->security = NULL; | |
3614 | } | |
3615 | ||
3616 | /* | |
3617 | * smack_key_permission - Smack access on a key | |
3618 | * @key_ref: gets to the object | |
d84f4f99 | 3619 | * @cred: the credentials to use |
e114e473 CS |
3620 | * @perm: unused |
3621 | * | |
3622 | * Return 0 if the task has read and write to the object, | |
3623 | * an error code otherwise | |
3624 | */ | |
3625 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 3626 | const struct cred *cred, unsigned perm) |
e114e473 CS |
3627 | { |
3628 | struct key *keyp; | |
ecfcc53f | 3629 | struct smk_audit_info ad; |
2f823ff8 | 3630 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 3631 | int request = 0; |
e114e473 CS |
3632 | |
3633 | keyp = key_ref_to_ptr(key_ref); | |
3634 | if (keyp == NULL) | |
3635 | return -EINVAL; | |
3636 | /* | |
3637 | * If the key hasn't been initialized give it access so that | |
3638 | * it may do so. | |
3639 | */ | |
3640 | if (keyp->security == NULL) | |
3641 | return 0; | |
3642 | /* | |
3643 | * This should not occur | |
3644 | */ | |
2f823ff8 | 3645 | if (tkp == NULL) |
e114e473 | 3646 | return -EACCES; |
ecfcc53f EB |
3647 | #ifdef CONFIG_AUDIT |
3648 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3649 | ad.a.u.key_struct.key = keyp->serial; | |
3650 | ad.a.u.key_struct.key_desc = keyp->description; | |
3651 | #endif | |
fffea214 DK |
3652 | if (perm & KEY_NEED_READ) |
3653 | request = MAY_READ; | |
3654 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
3655 | request = MAY_WRITE; | |
3656 | return smk_access(tkp, keyp->security, request, &ad); | |
e114e473 CS |
3657 | } |
3658 | #endif /* CONFIG_KEYS */ | |
3659 | ||
d20bdda6 AD |
3660 | /* |
3661 | * Smack Audit hooks | |
3662 | * | |
3663 | * Audit requires a unique representation of each Smack specific | |
3664 | * rule. This unique representation is used to distinguish the | |
3665 | * object to be audited from remaining kernel objects and also | |
3666 | * works as a glue between the audit hooks. | |
3667 | * | |
3668 | * Since repository entries are added but never deleted, we'll use | |
3669 | * the smack_known label address related to the given audit rule as | |
3670 | * the needed unique representation. This also better fits the smack | |
3671 | * model where nearly everything is a label. | |
3672 | */ | |
3673 | #ifdef CONFIG_AUDIT | |
3674 | ||
3675 | /** | |
3676 | * smack_audit_rule_init - Initialize a smack audit rule | |
3677 | * @field: audit rule fields given from user-space (audit.h) | |
3678 | * @op: required testing operator (=, !=, >, <, ...) | |
3679 | * @rulestr: smack label to be audited | |
3680 | * @vrule: pointer to save our own audit rule representation | |
3681 | * | |
3682 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3683 | * The label to be audited is created if necessay. | |
3684 | */ | |
3685 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3686 | { | |
3687 | char **rule = (char **)vrule; | |
3688 | *rule = NULL; | |
3689 | ||
3690 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3691 | return -EINVAL; | |
3692 | ||
5af75d8d | 3693 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3694 | return -EINVAL; |
3695 | ||
3696 | *rule = smk_import(rulestr, 0); | |
3697 | ||
3698 | return 0; | |
3699 | } | |
3700 | ||
3701 | /** | |
3702 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3703 | * @krule: rule of interest, in Audit kernel representation format | |
3704 | * | |
3705 | * This is used to filter Smack rules from remaining Audit ones. | |
3706 | * If it's proved that this rule belongs to us, the | |
3707 | * audit_rule_match hook will be called to do the final judgement. | |
3708 | */ | |
3709 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3710 | { | |
3711 | struct audit_field *f; | |
3712 | int i; | |
3713 | ||
3714 | for (i = 0; i < krule->field_count; i++) { | |
3715 | f = &krule->fields[i]; | |
3716 | ||
3717 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3718 | return 1; | |
3719 | } | |
3720 | ||
3721 | return 0; | |
3722 | } | |
3723 | ||
3724 | /** | |
3725 | * smack_audit_rule_match - Audit given object ? | |
3726 | * @secid: security id for identifying the object to test | |
3727 | * @field: audit rule flags given from user-space | |
3728 | * @op: required testing operator | |
3729 | * @vrule: smack internal rule presentation | |
3730 | * @actx: audit context associated with the check | |
3731 | * | |
3732 | * The core Audit hook. It's used to take the decision of | |
3733 | * whether to audit or not to audit a given object. | |
3734 | */ | |
3735 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3736 | struct audit_context *actx) | |
3737 | { | |
2f823ff8 | 3738 | struct smack_known *skp; |
d20bdda6 AD |
3739 | char *rule = vrule; |
3740 | ||
4eb0f4ab RGB |
3741 | if (unlikely(!rule)) { |
3742 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
3743 | return -ENOENT; |
3744 | } | |
3745 | ||
3746 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3747 | return 0; | |
3748 | ||
2f823ff8 | 3749 | skp = smack_from_secid(secid); |
d20bdda6 AD |
3750 | |
3751 | /* | |
3752 | * No need to do string comparisons. If a match occurs, | |
3753 | * both pointers will point to the same smack_known | |
3754 | * label. | |
3755 | */ | |
5af75d8d | 3756 | if (op == Audit_equal) |
2f823ff8 | 3757 | return (rule == skp->smk_known); |
5af75d8d | 3758 | if (op == Audit_not_equal) |
2f823ff8 | 3759 | return (rule != skp->smk_known); |
d20bdda6 AD |
3760 | |
3761 | return 0; | |
3762 | } | |
3763 | ||
3764 | /** | |
3765 | * smack_audit_rule_free - free smack rule representation | |
3766 | * @vrule: rule to be freed. | |
3767 | * | |
3768 | * No memory was allocated. | |
3769 | */ | |
3770 | static void smack_audit_rule_free(void *vrule) | |
3771 | { | |
3772 | /* No-op */ | |
3773 | } | |
3774 | ||
3775 | #endif /* CONFIG_AUDIT */ | |
3776 | ||
746df9b5 DQ |
3777 | /** |
3778 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
3779 | * @name: Full xattr name to check. | |
3780 | */ | |
3781 | static int smack_ismaclabel(const char *name) | |
3782 | { | |
3783 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
3784 | } | |
3785 | ||
3786 | ||
251a2a95 | 3787 | /** |
e114e473 CS |
3788 | * smack_secid_to_secctx - return the smack label for a secid |
3789 | * @secid: incoming integer | |
3790 | * @secdata: destination | |
3791 | * @seclen: how long it is | |
3792 | * | |
3793 | * Exists for networking code. | |
3794 | */ | |
3795 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3796 | { | |
2f823ff8 | 3797 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 3798 | |
d5630b9d | 3799 | if (secdata) |
2f823ff8 CS |
3800 | *secdata = skp->smk_known; |
3801 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
3802 | return 0; |
3803 | } | |
3804 | ||
251a2a95 | 3805 | /** |
4bc87e62 CS |
3806 | * smack_secctx_to_secid - return the secid for a smack label |
3807 | * @secdata: smack label | |
3808 | * @seclen: how long result is | |
3809 | * @secid: outgoing integer | |
3810 | * | |
3811 | * Exists for audit and networking code. | |
3812 | */ | |
e52c1764 | 3813 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3814 | { |
3815 | *secid = smack_to_secid(secdata); | |
3816 | return 0; | |
3817 | } | |
3818 | ||
251a2a95 | 3819 | /** |
e114e473 | 3820 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3821 | * @secdata: unused |
3822 | * @seclen: unused | |
e114e473 CS |
3823 | * |
3824 | * Exists to make sure nothing gets done, and properly | |
3825 | */ | |
3826 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3827 | { | |
3828 | } | |
3829 | ||
1ee65e37 DQ |
3830 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3831 | { | |
3832 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3833 | } | |
3834 | ||
3835 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3836 | { | |
3837 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3838 | } | |
3839 | ||
3840 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3841 | { | |
3842 | int len = 0; | |
3843 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3844 | ||
3845 | if (len < 0) | |
3846 | return len; | |
3847 | *ctxlen = len; | |
3848 | return 0; | |
3849 | } | |
3850 | ||
076c54c5 AD |
3851 | struct security_operations smack_ops = { |
3852 | .name = "smack", | |
3853 | ||
9e48858f | 3854 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3855 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3856 | .syslog = smack_syslog, |
e114e473 CS |
3857 | |
3858 | .sb_alloc_security = smack_sb_alloc_security, | |
3859 | .sb_free_security = smack_sb_free_security, | |
3860 | .sb_copy_data = smack_sb_copy_data, | |
3861 | .sb_kern_mount = smack_sb_kern_mount, | |
3862 | .sb_statfs = smack_sb_statfs, | |
e114e473 | 3863 | |
676dac4b | 3864 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3865 | .bprm_committing_creds = smack_bprm_committing_creds, |
3866 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3867 | |
e114e473 CS |
3868 | .inode_alloc_security = smack_inode_alloc_security, |
3869 | .inode_free_security = smack_inode_free_security, | |
3870 | .inode_init_security = smack_inode_init_security, | |
3871 | .inode_link = smack_inode_link, | |
3872 | .inode_unlink = smack_inode_unlink, | |
3873 | .inode_rmdir = smack_inode_rmdir, | |
3874 | .inode_rename = smack_inode_rename, | |
3875 | .inode_permission = smack_inode_permission, | |
3876 | .inode_setattr = smack_inode_setattr, | |
3877 | .inode_getattr = smack_inode_getattr, | |
3878 | .inode_setxattr = smack_inode_setxattr, | |
3879 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3880 | .inode_getxattr = smack_inode_getxattr, | |
3881 | .inode_removexattr = smack_inode_removexattr, | |
3882 | .inode_getsecurity = smack_inode_getsecurity, | |
3883 | .inode_setsecurity = smack_inode_setsecurity, | |
3884 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3885 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3886 | |
3887 | .file_permission = smack_file_permission, | |
3888 | .file_alloc_security = smack_file_alloc_security, | |
3889 | .file_free_security = smack_file_free_security, | |
3890 | .file_ioctl = smack_file_ioctl, | |
3891 | .file_lock = smack_file_lock, | |
3892 | .file_fcntl = smack_file_fcntl, | |
e5467859 AV |
3893 | .mmap_file = smack_mmap_file, |
3894 | .mmap_addr = cap_mmap_addr, | |
e114e473 CS |
3895 | .file_set_fowner = smack_file_set_fowner, |
3896 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3897 | .file_receive = smack_file_receive, | |
3898 | ||
83d49856 | 3899 | .file_open = smack_file_open, |
531f1d45 | 3900 | |
ee18d64c | 3901 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3902 | .cred_free = smack_cred_free, |
d84f4f99 | 3903 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3904 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3905 | .kernel_act_as = smack_kernel_act_as, |
3906 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3907 | .task_setpgid = smack_task_setpgid, |
3908 | .task_getpgid = smack_task_getpgid, | |
3909 | .task_getsid = smack_task_getsid, | |
3910 | .task_getsecid = smack_task_getsecid, | |
3911 | .task_setnice = smack_task_setnice, | |
3912 | .task_setioprio = smack_task_setioprio, | |
3913 | .task_getioprio = smack_task_getioprio, | |
3914 | .task_setscheduler = smack_task_setscheduler, | |
3915 | .task_getscheduler = smack_task_getscheduler, | |
3916 | .task_movememory = smack_task_movememory, | |
3917 | .task_kill = smack_task_kill, | |
3918 | .task_wait = smack_task_wait, | |
e114e473 CS |
3919 | .task_to_inode = smack_task_to_inode, |
3920 | ||
3921 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3922 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3923 | |
3924 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3925 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3926 | ||
3927 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3928 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3929 | .msg_queue_associate = smack_msg_queue_associate, | |
3930 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3931 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3932 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3933 | ||
3934 | .shm_alloc_security = smack_shm_alloc_security, | |
3935 | .shm_free_security = smack_shm_free_security, | |
3936 | .shm_associate = smack_shm_associate, | |
3937 | .shm_shmctl = smack_shm_shmctl, | |
3938 | .shm_shmat = smack_shm_shmat, | |
3939 | ||
3940 | .sem_alloc_security = smack_sem_alloc_security, | |
3941 | .sem_free_security = smack_sem_free_security, | |
3942 | .sem_associate = smack_sem_associate, | |
3943 | .sem_semctl = smack_sem_semctl, | |
3944 | .sem_semop = smack_sem_semop, | |
3945 | ||
e114e473 CS |
3946 | .d_instantiate = smack_d_instantiate, |
3947 | ||
3948 | .getprocattr = smack_getprocattr, | |
3949 | .setprocattr = smack_setprocattr, | |
3950 | ||
3951 | .unix_stream_connect = smack_unix_stream_connect, | |
3952 | .unix_may_send = smack_unix_may_send, | |
3953 | ||
3954 | .socket_post_create = smack_socket_post_create, | |
c6739443 | 3955 | .socket_bind = smack_socket_bind, |
6d3dc07c CS |
3956 | .socket_connect = smack_socket_connect, |
3957 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3958 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3959 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3960 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3961 | .sk_alloc_security = smack_sk_alloc_security, | |
3962 | .sk_free_security = smack_sk_free_security, | |
3963 | .sock_graft = smack_sock_graft, | |
3964 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3965 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3966 | |
e114e473 CS |
3967 | /* key management security hooks */ |
3968 | #ifdef CONFIG_KEYS | |
3969 | .key_alloc = smack_key_alloc, | |
3970 | .key_free = smack_key_free, | |
3971 | .key_permission = smack_key_permission, | |
3972 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3973 | |
3974 | /* Audit hooks */ | |
3975 | #ifdef CONFIG_AUDIT | |
3976 | .audit_rule_init = smack_audit_rule_init, | |
3977 | .audit_rule_known = smack_audit_rule_known, | |
3978 | .audit_rule_match = smack_audit_rule_match, | |
3979 | .audit_rule_free = smack_audit_rule_free, | |
3980 | #endif /* CONFIG_AUDIT */ | |
3981 | ||
746df9b5 | 3982 | .ismaclabel = smack_ismaclabel, |
e114e473 | 3983 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3984 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3985 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3986 | .inode_notifysecctx = smack_inode_notifysecctx, |
3987 | .inode_setsecctx = smack_inode_setsecctx, | |
3988 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3989 | }; |
3990 | ||
7198e2ee | 3991 | |
86812bb0 | 3992 | static __init void init_smack_known_list(void) |
7198e2ee | 3993 | { |
86812bb0 CS |
3994 | /* |
3995 | * Initialize rule list locks | |
3996 | */ | |
3997 | mutex_init(&smack_known_huh.smk_rules_lock); | |
3998 | mutex_init(&smack_known_hat.smk_rules_lock); | |
3999 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4000 | mutex_init(&smack_known_star.smk_rules_lock); | |
4001 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4002 | mutex_init(&smack_known_web.smk_rules_lock); | |
4003 | /* | |
4004 | * Initialize rule lists | |
4005 | */ | |
4006 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4007 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4008 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4009 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4010 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4011 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4012 | /* | |
4013 | * Create the known labels list | |
4014 | */ | |
4d7cf4a1 TS |
4015 | smk_insert_entry(&smack_known_huh); |
4016 | smk_insert_entry(&smack_known_hat); | |
4017 | smk_insert_entry(&smack_known_star); | |
4018 | smk_insert_entry(&smack_known_floor); | |
4019 | smk_insert_entry(&smack_known_invalid); | |
4020 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4021 | } |
4022 | ||
e114e473 CS |
4023 | /** |
4024 | * smack_init - initialize the smack system | |
4025 | * | |
4026 | * Returns 0 | |
4027 | */ | |
4028 | static __init int smack_init(void) | |
4029 | { | |
d84f4f99 | 4030 | struct cred *cred; |
676dac4b | 4031 | struct task_smack *tsp; |
d84f4f99 | 4032 | |
7898e1f8 CS |
4033 | if (!security_module_enable(&smack_ops)) |
4034 | return 0; | |
4035 | ||
2f823ff8 CS |
4036 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4037 | GFP_KERNEL); | |
676dac4b CS |
4038 | if (tsp == NULL) |
4039 | return -ENOMEM; | |
4040 | ||
e114e473 CS |
4041 | printk(KERN_INFO "Smack: Initializing.\n"); |
4042 | ||
4043 | /* | |
4044 | * Set the security state for the initial task. | |
4045 | */ | |
d84f4f99 | 4046 | cred = (struct cred *) current->cred; |
676dac4b | 4047 | cred->security = tsp; |
e114e473 | 4048 | |
86812bb0 CS |
4049 | /* initialize the smack_known_list */ |
4050 | init_smack_known_list(); | |
e114e473 CS |
4051 | |
4052 | /* | |
4053 | * Register with LSM | |
4054 | */ | |
4055 | if (register_security(&smack_ops)) | |
4056 | panic("smack: Unable to register with kernel.\n"); | |
4057 | ||
4058 | return 0; | |
4059 | } | |
4060 | ||
4061 | /* | |
4062 | * Smack requires early initialization in order to label | |
4063 | * all processes and objects when they are created. | |
4064 | */ | |
4065 | security_initcall(smack_init); |