Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
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) { | |
926 | skp = smk_import_entry(value, size); | |
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) | |
1098 | isp = ssp->smk_in; | |
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 | { | |
1125 | int len = strlen(XATTR_NAME_SMACK); | |
1126 | ||
1127 | if (buffer != NULL && len <= buffer_size) { | |
1128 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1129 | return len; | |
1130 | } | |
1131 | return -EINVAL; | |
1132 | } | |
1133 | ||
d20bdda6 AD |
1134 | /** |
1135 | * smack_inode_getsecid - Extract inode's security id | |
1136 | * @inode: inode to extract the info from | |
1137 | * @secid: where result will be saved | |
1138 | */ | |
1139 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1140 | { | |
1141 | struct inode_smack *isp = inode->i_security; | |
1142 | ||
1143 | *secid = smack_to_secid(isp->smk_inode); | |
1144 | } | |
1145 | ||
e114e473 CS |
1146 | /* |
1147 | * File Hooks | |
1148 | */ | |
1149 | ||
1150 | /** | |
1151 | * smack_file_permission - Smack check on file operations | |
1152 | * @file: unused | |
1153 | * @mask: unused | |
1154 | * | |
1155 | * Returns 0 | |
1156 | * | |
1157 | * Should access checks be done on each read or write? | |
1158 | * UNICOS and SELinux say yes. | |
1159 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1160 | * | |
1161 | * I'll say no for now. Smack does not do the frequent | |
1162 | * label changing that SELinux does. | |
1163 | */ | |
1164 | static int smack_file_permission(struct file *file, int mask) | |
1165 | { | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * smack_file_alloc_security - assign a file security blob | |
1171 | * @file: the object | |
1172 | * | |
1173 | * The security blob for a file is a pointer to the master | |
1174 | * label list, so no allocation is done. | |
1175 | * | |
1176 | * Returns 0 | |
1177 | */ | |
1178 | static int smack_file_alloc_security(struct file *file) | |
1179 | { | |
2f823ff8 CS |
1180 | struct smack_known *skp = smk_of_current(); |
1181 | ||
1182 | file->f_security = skp->smk_known; | |
e114e473 CS |
1183 | return 0; |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * smack_file_free_security - clear a file security blob | |
1188 | * @file: the object | |
1189 | * | |
1190 | * The security blob for a file is a pointer to the master | |
1191 | * label list, so no memory is freed. | |
1192 | */ | |
1193 | static void smack_file_free_security(struct file *file) | |
1194 | { | |
1195 | file->f_security = NULL; | |
1196 | } | |
1197 | ||
1198 | /** | |
1199 | * smack_file_ioctl - Smack check on ioctls | |
1200 | * @file: the object | |
1201 | * @cmd: what to do | |
1202 | * @arg: unused | |
1203 | * | |
1204 | * Relies heavily on the correct use of the ioctl command conventions. | |
1205 | * | |
1206 | * Returns 0 if allowed, error code otherwise | |
1207 | */ | |
1208 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1209 | unsigned long arg) | |
1210 | { | |
1211 | int rc = 0; | |
ecfcc53f EB |
1212 | struct smk_audit_info ad; |
1213 | ||
f48b7399 | 1214 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1215 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1216 | |
1217 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1218 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1219 | |
1220 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1221 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1222 | |
1223 | return rc; | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * smack_file_lock - Smack check on file locking | |
1228 | * @file: the object | |
251a2a95 | 1229 | * @cmd: unused |
e114e473 | 1230 | * |
c0ab6e56 | 1231 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1232 | */ |
1233 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1234 | { | |
ecfcc53f EB |
1235 | struct smk_audit_info ad; |
1236 | ||
92f42509 EP |
1237 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1238 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c0ab6e56 | 1239 | return smk_curacc(file->f_security, MAY_LOCK, &ad); |
e114e473 CS |
1240 | } |
1241 | ||
1242 | /** | |
1243 | * smack_file_fcntl - Smack check on fcntl | |
1244 | * @file: the object | |
1245 | * @cmd: what action to check | |
1246 | * @arg: unused | |
1247 | * | |
531f1d45 CS |
1248 | * Generally these operations are harmless. |
1249 | * File locking operations present an obvious mechanism | |
1250 | * for passing information, so they require write access. | |
1251 | * | |
e114e473 CS |
1252 | * Returns 0 if current has access, error code otherwise |
1253 | */ | |
1254 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1255 | unsigned long arg) | |
1256 | { | |
ecfcc53f | 1257 | struct smk_audit_info ad; |
531f1d45 | 1258 | int rc = 0; |
e114e473 | 1259 | |
ecfcc53f | 1260 | |
e114e473 | 1261 | switch (cmd) { |
e114e473 | 1262 | case F_GETLK: |
c0ab6e56 | 1263 | break; |
e114e473 CS |
1264 | case F_SETLK: |
1265 | case F_SETLKW: | |
c0ab6e56 CS |
1266 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1267 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1268 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); | |
1269 | break; | |
e114e473 CS |
1270 | case F_SETOWN: |
1271 | case F_SETSIG: | |
531f1d45 CS |
1272 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1273 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1274 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1275 | break; |
1276 | default: | |
531f1d45 | 1277 | break; |
e114e473 CS |
1278 | } |
1279 | ||
1280 | return rc; | |
1281 | } | |
1282 | ||
7898e1f8 | 1283 | /** |
e5467859 | 1284 | * smack_mmap_file : |
7898e1f8 CS |
1285 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1286 | * if mapping anonymous memory. | |
1287 | * @file contains the file structure for file to map (may be NULL). | |
1288 | * @reqprot contains the protection requested by the application. | |
1289 | * @prot contains the protection that will be applied by the kernel. | |
1290 | * @flags contains the operational flags. | |
1291 | * Return 0 if permission is granted. | |
1292 | */ | |
e5467859 | 1293 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1294 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1295 | unsigned long flags) |
7898e1f8 | 1296 | { |
272cd7a8 | 1297 | struct smack_known *skp; |
2f823ff8 | 1298 | struct smack_known *mkp; |
7898e1f8 CS |
1299 | struct smack_rule *srp; |
1300 | struct task_smack *tsp; | |
0e0a070d | 1301 | char *osmack; |
7898e1f8 | 1302 | struct inode_smack *isp; |
0e0a070d CS |
1303 | int may; |
1304 | int mmay; | |
1305 | int tmay; | |
7898e1f8 CS |
1306 | int rc; |
1307 | ||
496ad9aa | 1308 | if (file == NULL) |
7898e1f8 CS |
1309 | return 0; |
1310 | ||
496ad9aa | 1311 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1312 | if (isp->smk_mmap == NULL) |
1313 | return 0; | |
2f823ff8 | 1314 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1315 | |
1316 | tsp = current_security(); | |
2f823ff8 | 1317 | skp = smk_of_current(); |
7898e1f8 CS |
1318 | rc = 0; |
1319 | ||
1320 | rcu_read_lock(); | |
1321 | /* | |
1322 | * For each Smack rule associated with the subject | |
1323 | * label verify that the SMACK64MMAP also has access | |
1324 | * to that rule's object label. | |
7898e1f8 | 1325 | */ |
272cd7a8 | 1326 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1327 | osmack = srp->smk_object; |
7898e1f8 CS |
1328 | /* |
1329 | * Matching labels always allows access. | |
1330 | */ | |
2f823ff8 | 1331 | if (mkp->smk_known == osmack) |
7898e1f8 | 1332 | continue; |
0e0a070d CS |
1333 | /* |
1334 | * If there is a matching local rule take | |
1335 | * that into account as well. | |
1336 | */ | |
2f823ff8 | 1337 | may = smk_access_entry(srp->smk_subject->smk_known, osmack, |
0e0a070d CS |
1338 | &tsp->smk_rules); |
1339 | if (may == -ENOENT) | |
1340 | may = srp->smk_access; | |
1341 | else | |
1342 | may &= srp->smk_access; | |
1343 | /* | |
1344 | * If may is zero the SMACK64MMAP subject can't | |
1345 | * possibly have less access. | |
1346 | */ | |
1347 | if (may == 0) | |
1348 | continue; | |
1349 | ||
1350 | /* | |
1351 | * Fetch the global list entry. | |
1352 | * If there isn't one a SMACK64MMAP subject | |
1353 | * can't have as much access as current. | |
1354 | */ | |
2f823ff8 CS |
1355 | mmay = smk_access_entry(mkp->smk_known, osmack, |
1356 | &mkp->smk_rules); | |
0e0a070d CS |
1357 | if (mmay == -ENOENT) { |
1358 | rc = -EACCES; | |
1359 | break; | |
1360 | } | |
1361 | /* | |
1362 | * If there is a local entry it modifies the | |
1363 | * potential access, too. | |
1364 | */ | |
2f823ff8 CS |
1365 | tmay = smk_access_entry(mkp->smk_known, osmack, |
1366 | &tsp->smk_rules); | |
0e0a070d CS |
1367 | if (tmay != -ENOENT) |
1368 | mmay &= tmay; | |
7898e1f8 | 1369 | |
0e0a070d CS |
1370 | /* |
1371 | * If there is any access available to current that is | |
1372 | * not available to a SMACK64MMAP subject | |
1373 | * deny access. | |
1374 | */ | |
75a25637 | 1375 | if ((may | mmay) != mmay) { |
0e0a070d | 1376 | rc = -EACCES; |
7898e1f8 | 1377 | break; |
0e0a070d | 1378 | } |
7898e1f8 CS |
1379 | } |
1380 | ||
1381 | rcu_read_unlock(); | |
1382 | ||
1383 | return rc; | |
1384 | } | |
1385 | ||
e114e473 CS |
1386 | /** |
1387 | * smack_file_set_fowner - set the file security blob value | |
1388 | * @file: object in question | |
1389 | * | |
1390 | * Returns 0 | |
1391 | * Further research may be required on this one. | |
1392 | */ | |
1393 | static int smack_file_set_fowner(struct file *file) | |
1394 | { | |
2f823ff8 CS |
1395 | struct smack_known *skp = smk_of_current(); |
1396 | ||
1397 | file->f_security = skp->smk_known; | |
e114e473 CS |
1398 | return 0; |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * smack_file_send_sigiotask - Smack on sigio | |
1403 | * @tsk: The target task | |
1404 | * @fown: the object the signal come from | |
1405 | * @signum: unused | |
1406 | * | |
1407 | * Allow a privileged task to get signals even if it shouldn't | |
1408 | * | |
1409 | * Returns 0 if a subject with the object's smack could | |
1410 | * write to the task, an error code otherwise. | |
1411 | */ | |
1412 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1413 | struct fown_struct *fown, int signum) | |
1414 | { | |
2f823ff8 CS |
1415 | struct smack_known *skp; |
1416 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1417 | struct file *file; |
1418 | int rc; | |
ecfcc53f | 1419 | struct smk_audit_info ad; |
e114e473 CS |
1420 | |
1421 | /* | |
1422 | * struct fown_struct is never outside the context of a struct file | |
1423 | */ | |
1424 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1425 | |
ecfcc53f | 1426 | /* we don't log here as rc can be overriden */ |
2f823ff8 CS |
1427 | skp = smk_find_entry(file->f_security); |
1428 | rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL); | |
5cd9c58f | 1429 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1430 | rc = 0; |
1431 | ||
1432 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1433 | smk_ad_setfield_u_tsk(&ad, tsk); | |
2f823ff8 | 1434 | smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1435 | return rc; |
1436 | } | |
1437 | ||
1438 | /** | |
1439 | * smack_file_receive - Smack file receive check | |
1440 | * @file: the object | |
1441 | * | |
1442 | * Returns 0 if current has access, error code otherwise | |
1443 | */ | |
1444 | static int smack_file_receive(struct file *file) | |
1445 | { | |
1446 | int may = 0; | |
ecfcc53f | 1447 | struct smk_audit_info ad; |
e114e473 | 1448 | |
4482a44f | 1449 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1450 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1451 | /* |
1452 | * This code relies on bitmasks. | |
1453 | */ | |
1454 | if (file->f_mode & FMODE_READ) | |
1455 | may = MAY_READ; | |
1456 | if (file->f_mode & FMODE_WRITE) | |
1457 | may |= MAY_WRITE; | |
1458 | ||
ecfcc53f | 1459 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1460 | } |
1461 | ||
531f1d45 | 1462 | /** |
83d49856 | 1463 | * smack_file_open - Smack dentry open processing |
531f1d45 CS |
1464 | * @file: the object |
1465 | * @cred: unused | |
1466 | * | |
1467 | * Set the security blob in the file structure. | |
1468 | * | |
1469 | * Returns 0 | |
1470 | */ | |
83d49856 | 1471 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1472 | { |
496ad9aa | 1473 | struct inode_smack *isp = file_inode(file)->i_security; |
531f1d45 CS |
1474 | |
1475 | file->f_security = isp->smk_inode; | |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
e114e473 CS |
1480 | /* |
1481 | * Task hooks | |
1482 | */ | |
1483 | ||
ee18d64c DH |
1484 | /** |
1485 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1486 | * @new: the new credentials | |
1487 | * @gfp: the atomicity of any memory allocations | |
1488 | * | |
1489 | * Prepare a blank set of credentials for modification. This must allocate all | |
1490 | * the memory the LSM module might require such that cred_transfer() can | |
1491 | * complete without error. | |
1492 | */ | |
1493 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1494 | { | |
7898e1f8 CS |
1495 | struct task_smack *tsp; |
1496 | ||
1497 | tsp = new_task_smack(NULL, NULL, gfp); | |
1498 | if (tsp == NULL) | |
676dac4b | 1499 | return -ENOMEM; |
7898e1f8 CS |
1500 | |
1501 | cred->security = tsp; | |
1502 | ||
ee18d64c DH |
1503 | return 0; |
1504 | } | |
1505 | ||
1506 | ||
e114e473 | 1507 | /** |
f1752eec DH |
1508 | * smack_cred_free - "free" task-level security credentials |
1509 | * @cred: the credentials in question | |
e114e473 | 1510 | * |
e114e473 | 1511 | */ |
f1752eec | 1512 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1513 | { |
7898e1f8 CS |
1514 | struct task_smack *tsp = cred->security; |
1515 | struct smack_rule *rp; | |
1516 | struct list_head *l; | |
1517 | struct list_head *n; | |
1518 | ||
1519 | if (tsp == NULL) | |
1520 | return; | |
1521 | cred->security = NULL; | |
1522 | ||
1523 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1524 | rp = list_entry(l, struct smack_rule, list); | |
1525 | list_del(&rp->list); | |
1526 | kfree(rp); | |
1527 | } | |
1528 | kfree(tsp); | |
e114e473 CS |
1529 | } |
1530 | ||
d84f4f99 DH |
1531 | /** |
1532 | * smack_cred_prepare - prepare new set of credentials for modification | |
1533 | * @new: the new credentials | |
1534 | * @old: the original credentials | |
1535 | * @gfp: the atomicity of any memory allocations | |
1536 | * | |
1537 | * Prepare a new set of credentials for modification. | |
1538 | */ | |
1539 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1540 | gfp_t gfp) | |
1541 | { | |
676dac4b CS |
1542 | struct task_smack *old_tsp = old->security; |
1543 | struct task_smack *new_tsp; | |
7898e1f8 | 1544 | int rc; |
676dac4b | 1545 | |
7898e1f8 | 1546 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1547 | if (new_tsp == NULL) |
1548 | return -ENOMEM; | |
1549 | ||
7898e1f8 CS |
1550 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1551 | if (rc != 0) | |
1552 | return rc; | |
1553 | ||
676dac4b | 1554 | new->security = new_tsp; |
d84f4f99 DH |
1555 | return 0; |
1556 | } | |
1557 | ||
ee18d64c DH |
1558 | /** |
1559 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1560 | * @new: the new credentials | |
1561 | * @old: the original credentials | |
1562 | * | |
1563 | * Fill in a set of blank credentials from another set of credentials. | |
1564 | */ | |
1565 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1566 | { | |
676dac4b CS |
1567 | struct task_smack *old_tsp = old->security; |
1568 | struct task_smack *new_tsp = new->security; | |
1569 | ||
1570 | new_tsp->smk_task = old_tsp->smk_task; | |
1571 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1572 | mutex_init(&new_tsp->smk_rules_lock); |
1573 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1574 | ||
1575 | ||
1576 | /* cbs copy rule list */ | |
ee18d64c DH |
1577 | } |
1578 | ||
3a3b7ce9 DH |
1579 | /** |
1580 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1581 | * @new: points to the set of credentials to be modified. |
1582 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1583 | * |
1584 | * Set the security data for a kernel service. | |
1585 | */ | |
1586 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1587 | { | |
676dac4b | 1588 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1589 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1590 | |
2f823ff8 | 1591 | if (skp == NULL) |
3a3b7ce9 DH |
1592 | return -EINVAL; |
1593 | ||
2f823ff8 | 1594 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1595 | return 0; |
1596 | } | |
1597 | ||
1598 | /** | |
1599 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1600 | * @new: points to the set of credentials to be modified |
1601 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1602 | * |
1603 | * Set the file creation context in a set of credentials to the same | |
1604 | * as the objective context of the specified inode | |
1605 | */ | |
1606 | static int smack_kernel_create_files_as(struct cred *new, | |
1607 | struct inode *inode) | |
1608 | { | |
1609 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1610 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1611 | |
2f823ff8 CS |
1612 | tsp->smk_forked = smk_find_entry(isp->smk_inode); |
1613 | tsp->smk_task = tsp->smk_forked; | |
3a3b7ce9 DH |
1614 | return 0; |
1615 | } | |
1616 | ||
ecfcc53f EB |
1617 | /** |
1618 | * smk_curacc_on_task - helper to log task related access | |
1619 | * @p: the task object | |
531f1d45 CS |
1620 | * @access: the access requested |
1621 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1622 | * |
1623 | * Return 0 if access is permitted | |
1624 | */ | |
531f1d45 CS |
1625 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1626 | const char *caller) | |
ecfcc53f EB |
1627 | { |
1628 | struct smk_audit_info ad; | |
2f823ff8 | 1629 | struct smack_known *skp = smk_of_task(task_security(p)); |
ecfcc53f | 1630 | |
531f1d45 | 1631 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1632 | smk_ad_setfield_u_tsk(&ad, p); |
2f823ff8 | 1633 | return smk_curacc(skp->smk_known, access, &ad); |
ecfcc53f EB |
1634 | } |
1635 | ||
e114e473 CS |
1636 | /** |
1637 | * smack_task_setpgid - Smack check on setting pgid | |
1638 | * @p: the task object | |
1639 | * @pgid: unused | |
1640 | * | |
1641 | * Return 0 if write access is permitted | |
1642 | */ | |
1643 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1644 | { | |
531f1d45 | 1645 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1646 | } |
1647 | ||
1648 | /** | |
1649 | * smack_task_getpgid - Smack access check for getpgid | |
1650 | * @p: the object task | |
1651 | * | |
1652 | * Returns 0 if current can read the object task, error code otherwise | |
1653 | */ | |
1654 | static int smack_task_getpgid(struct task_struct *p) | |
1655 | { | |
531f1d45 | 1656 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1657 | } |
1658 | ||
1659 | /** | |
1660 | * smack_task_getsid - Smack access check for getsid | |
1661 | * @p: the object task | |
1662 | * | |
1663 | * Returns 0 if current can read the object task, error code otherwise | |
1664 | */ | |
1665 | static int smack_task_getsid(struct task_struct *p) | |
1666 | { | |
531f1d45 | 1667 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1668 | } |
1669 | ||
1670 | /** | |
1671 | * smack_task_getsecid - get the secid of the task | |
1672 | * @p: the object task | |
1673 | * @secid: where to put the result | |
1674 | * | |
1675 | * Sets the secid to contain a u32 version of the smack label. | |
1676 | */ | |
1677 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1678 | { | |
2f823ff8 CS |
1679 | struct smack_known *skp = smk_of_task(task_security(p)); |
1680 | ||
1681 | *secid = skp->smk_secid; | |
e114e473 CS |
1682 | } |
1683 | ||
1684 | /** | |
1685 | * smack_task_setnice - Smack check on setting nice | |
1686 | * @p: the task object | |
1687 | * @nice: unused | |
1688 | * | |
1689 | * Return 0 if write access is permitted | |
1690 | */ | |
1691 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1692 | { | |
bcdca225 CS |
1693 | int rc; |
1694 | ||
1695 | rc = cap_task_setnice(p, nice); | |
1696 | if (rc == 0) | |
531f1d45 | 1697 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1698 | return rc; |
e114e473 CS |
1699 | } |
1700 | ||
1701 | /** | |
1702 | * smack_task_setioprio - Smack check on setting ioprio | |
1703 | * @p: the task object | |
1704 | * @ioprio: unused | |
1705 | * | |
1706 | * Return 0 if write access is permitted | |
1707 | */ | |
1708 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1709 | { | |
bcdca225 CS |
1710 | int rc; |
1711 | ||
1712 | rc = cap_task_setioprio(p, ioprio); | |
1713 | if (rc == 0) | |
531f1d45 | 1714 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1715 | return rc; |
e114e473 CS |
1716 | } |
1717 | ||
1718 | /** | |
1719 | * smack_task_getioprio - Smack check on reading ioprio | |
1720 | * @p: the task object | |
1721 | * | |
1722 | * Return 0 if read access is permitted | |
1723 | */ | |
1724 | static int smack_task_getioprio(struct task_struct *p) | |
1725 | { | |
531f1d45 | 1726 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1727 | } |
1728 | ||
1729 | /** | |
1730 | * smack_task_setscheduler - Smack check on setting scheduler | |
1731 | * @p: the task object | |
1732 | * @policy: unused | |
1733 | * @lp: unused | |
1734 | * | |
1735 | * Return 0 if read access is permitted | |
1736 | */ | |
b0ae1981 | 1737 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1738 | { |
bcdca225 CS |
1739 | int rc; |
1740 | ||
b0ae1981 | 1741 | rc = cap_task_setscheduler(p); |
bcdca225 | 1742 | if (rc == 0) |
531f1d45 | 1743 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1744 | return rc; |
e114e473 CS |
1745 | } |
1746 | ||
1747 | /** | |
1748 | * smack_task_getscheduler - Smack check on reading scheduler | |
1749 | * @p: the task object | |
1750 | * | |
1751 | * Return 0 if read access is permitted | |
1752 | */ | |
1753 | static int smack_task_getscheduler(struct task_struct *p) | |
1754 | { | |
531f1d45 | 1755 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1756 | } |
1757 | ||
1758 | /** | |
1759 | * smack_task_movememory - Smack check on moving memory | |
1760 | * @p: the task object | |
1761 | * | |
1762 | * Return 0 if write access is permitted | |
1763 | */ | |
1764 | static int smack_task_movememory(struct task_struct *p) | |
1765 | { | |
531f1d45 | 1766 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1767 | } |
1768 | ||
1769 | /** | |
1770 | * smack_task_kill - Smack check on signal delivery | |
1771 | * @p: the task object | |
1772 | * @info: unused | |
1773 | * @sig: unused | |
1774 | * @secid: identifies the smack to use in lieu of current's | |
1775 | * | |
1776 | * Return 0 if write access is permitted | |
1777 | * | |
1778 | * The secid behavior is an artifact of an SELinux hack | |
1779 | * in the USB code. Someday it may go away. | |
1780 | */ | |
1781 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1782 | int sig, u32 secid) | |
1783 | { | |
ecfcc53f | 1784 | struct smk_audit_info ad; |
2f823ff8 CS |
1785 | struct smack_known *skp; |
1786 | struct smack_known *tkp = smk_of_task(task_security(p)); | |
ecfcc53f EB |
1787 | |
1788 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1789 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1790 | /* |
1791 | * Sending a signal requires that the sender | |
1792 | * can write the receiver. | |
1793 | */ | |
1794 | if (secid == 0) | |
2f823ff8 | 1795 | return smk_curacc(tkp->smk_known, MAY_WRITE, &ad); |
e114e473 CS |
1796 | /* |
1797 | * If the secid isn't 0 we're dealing with some USB IO | |
1798 | * specific behavior. This is not clean. For one thing | |
1799 | * we can't take privilege into account. | |
1800 | */ | |
2f823ff8 CS |
1801 | skp = smack_from_secid(secid); |
1802 | return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad); | |
e114e473 CS |
1803 | } |
1804 | ||
1805 | /** | |
1806 | * smack_task_wait - Smack access check for waiting | |
1807 | * @p: task to wait for | |
1808 | * | |
c00bedb3 | 1809 | * Returns 0 |
e114e473 CS |
1810 | */ |
1811 | static int smack_task_wait(struct task_struct *p) | |
1812 | { | |
e114e473 | 1813 | /* |
c00bedb3 CS |
1814 | * Allow the operation to succeed. |
1815 | * Zombies are bad. | |
1816 | * In userless environments (e.g. phones) programs | |
1817 | * get marked with SMACK64EXEC and even if the parent | |
1818 | * and child shouldn't be talking the parent still | |
1819 | * may expect to know when the child exits. | |
e114e473 | 1820 | */ |
c00bedb3 | 1821 | return 0; |
e114e473 CS |
1822 | } |
1823 | ||
1824 | /** | |
1825 | * smack_task_to_inode - copy task smack into the inode blob | |
1826 | * @p: task to copy from | |
251a2a95 | 1827 | * @inode: inode to copy to |
e114e473 CS |
1828 | * |
1829 | * Sets the smack pointer in the inode security blob | |
1830 | */ | |
1831 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1832 | { | |
1833 | struct inode_smack *isp = inode->i_security; | |
2f823ff8 CS |
1834 | struct smack_known *skp = smk_of_task(task_security(p)); |
1835 | ||
1836 | isp->smk_inode = skp->smk_known; | |
e114e473 CS |
1837 | } |
1838 | ||
1839 | /* | |
1840 | * Socket hooks. | |
1841 | */ | |
1842 | ||
1843 | /** | |
1844 | * smack_sk_alloc_security - Allocate a socket blob | |
1845 | * @sk: the socket | |
1846 | * @family: unused | |
251a2a95 | 1847 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1848 | * |
1849 | * Assign Smack pointers to current | |
1850 | * | |
1851 | * Returns 0 on success, -ENOMEM is there's no memory | |
1852 | */ | |
1853 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1854 | { | |
2f823ff8 | 1855 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
1856 | struct socket_smack *ssp; |
1857 | ||
1858 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1859 | if (ssp == NULL) | |
1860 | return -ENOMEM; | |
1861 | ||
2f823ff8 CS |
1862 | ssp->smk_in = skp->smk_known; |
1863 | ssp->smk_out = skp; | |
272cd7a8 | 1864 | ssp->smk_packet = NULL; |
e114e473 CS |
1865 | |
1866 | sk->sk_security = ssp; | |
1867 | ||
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | /** | |
1872 | * smack_sk_free_security - Free a socket blob | |
1873 | * @sk: the socket | |
1874 | * | |
1875 | * Clears the blob pointer | |
1876 | */ | |
1877 | static void smack_sk_free_security(struct sock *sk) | |
1878 | { | |
1879 | kfree(sk->sk_security); | |
1880 | } | |
1881 | ||
07feee8f PM |
1882 | /** |
1883 | * smack_host_label - check host based restrictions | |
1884 | * @sip: the object end | |
1885 | * | |
1886 | * looks for host based access restrictions | |
1887 | * | |
1888 | * This version will only be appropriate for really small sets of single label | |
1889 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1890 | * taken before calling this function. | |
1891 | * | |
1892 | * Returns the label of the far end or NULL if it's not special. | |
1893 | */ | |
1894 | static char *smack_host_label(struct sockaddr_in *sip) | |
1895 | { | |
1896 | struct smk_netlbladdr *snp; | |
1897 | struct in_addr *siap = &sip->sin_addr; | |
1898 | ||
1899 | if (siap->s_addr == 0) | |
1900 | return NULL; | |
1901 | ||
1902 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1903 | /* | |
1904 | * we break after finding the first match because | |
1905 | * the list is sorted from longest to shortest mask | |
1906 | * so we have found the most specific match | |
1907 | */ | |
1908 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1909 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1910 | /* we have found the special CIPSO option */ | |
1911 | if (snp->smk_label == smack_cipso_option) | |
1912 | return NULL; | |
07feee8f | 1913 | return snp->smk_label; |
4303154e | 1914 | } |
07feee8f PM |
1915 | |
1916 | return NULL; | |
1917 | } | |
1918 | ||
e114e473 CS |
1919 | /** |
1920 | * smack_netlabel - Set the secattr on a socket | |
1921 | * @sk: the socket | |
6d3dc07c | 1922 | * @labeled: socket label scheme |
e114e473 CS |
1923 | * |
1924 | * Convert the outbound smack value (smk_out) to a | |
1925 | * secattr and attach it to the socket. | |
1926 | * | |
1927 | * Returns 0 on success or an error code | |
1928 | */ | |
6d3dc07c | 1929 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1930 | { |
f7112e6c | 1931 | struct smack_known *skp; |
07feee8f | 1932 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 1933 | int rc = 0; |
e114e473 | 1934 | |
6d3dc07c CS |
1935 | /* |
1936 | * Usually the netlabel code will handle changing the | |
1937 | * packet labeling based on the label. | |
1938 | * The case of a single label host is different, because | |
1939 | * a single label host should never get a labeled packet | |
1940 | * even though the label is usually associated with a packet | |
1941 | * label. | |
1942 | */ | |
1943 | local_bh_disable(); | |
1944 | bh_lock_sock_nested(sk); | |
1945 | ||
1946 | if (ssp->smk_out == smack_net_ambient || | |
1947 | labeled == SMACK_UNLABELED_SOCKET) | |
1948 | netlbl_sock_delattr(sk); | |
1949 | else { | |
2f823ff8 | 1950 | skp = ssp->smk_out; |
f7112e6c | 1951 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
1952 | } |
1953 | ||
1954 | bh_unlock_sock(sk); | |
1955 | local_bh_enable(); | |
4bc87e62 | 1956 | |
e114e473 CS |
1957 | return rc; |
1958 | } | |
1959 | ||
07feee8f PM |
1960 | /** |
1961 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1962 | * @sk: the socket | |
1963 | * @sap: the destination address | |
1964 | * | |
1965 | * Set the correct secattr for the given socket based on the destination | |
1966 | * address and perform any outbound access checks needed. | |
1967 | * | |
1968 | * Returns 0 on success or an error code. | |
1969 | * | |
1970 | */ | |
1971 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1972 | { | |
2f823ff8 | 1973 | struct smack_known *skp; |
07feee8f PM |
1974 | int rc; |
1975 | int sk_lbl; | |
1976 | char *hostsp; | |
1977 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1978 | struct smk_audit_info ad; |
07feee8f PM |
1979 | |
1980 | rcu_read_lock(); | |
1981 | hostsp = smack_host_label(sap); | |
1982 | if (hostsp != NULL) { | |
ecfcc53f | 1983 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
1984 | struct lsm_network_audit net; |
1985 | ||
48c62af6 EP |
1986 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
1987 | ad.a.u.net->family = sap->sin_family; | |
1988 | ad.a.u.net->dport = sap->sin_port; | |
1989 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 1990 | #endif |
923e9a13 | 1991 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 CS |
1992 | skp = ssp->smk_out; |
1993 | rc = smk_access(skp, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1994 | } else { |
1995 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1996 | rc = 0; | |
1997 | } | |
1998 | rcu_read_unlock(); | |
1999 | if (rc != 0) | |
2000 | return rc; | |
2001 | ||
2002 | return smack_netlabel(sk, sk_lbl); | |
2003 | } | |
2004 | ||
c6739443 CS |
2005 | /** |
2006 | * smk_ipv6_port_label - Smack port access table management | |
2007 | * @sock: socket | |
2008 | * @address: address | |
2009 | * | |
2010 | * Create or update the port list entry | |
2011 | */ | |
2012 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2013 | { | |
2014 | struct sock *sk = sock->sk; | |
2015 | struct sockaddr_in6 *addr6; | |
2016 | struct socket_smack *ssp = sock->sk->sk_security; | |
2017 | struct smk_port_label *spp; | |
2018 | unsigned short port = 0; | |
2019 | ||
2020 | if (address == NULL) { | |
2021 | /* | |
2022 | * This operation is changing the Smack information | |
2023 | * on the bound socket. Take the changes to the port | |
2024 | * as well. | |
2025 | */ | |
2026 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2027 | if (sk != spp->smk_sock) | |
2028 | continue; | |
2029 | spp->smk_in = ssp->smk_in; | |
2030 | spp->smk_out = ssp->smk_out; | |
2031 | return; | |
2032 | } | |
2033 | /* | |
2034 | * A NULL address is only used for updating existing | |
2035 | * bound entries. If there isn't one, it's OK. | |
2036 | */ | |
2037 | return; | |
2038 | } | |
2039 | ||
2040 | addr6 = (struct sockaddr_in6 *)address; | |
2041 | port = ntohs(addr6->sin6_port); | |
2042 | /* | |
2043 | * This is a special case that is safely ignored. | |
2044 | */ | |
2045 | if (port == 0) | |
2046 | return; | |
2047 | ||
2048 | /* | |
2049 | * Look for an existing port list entry. | |
2050 | * This is an indication that a port is getting reused. | |
2051 | */ | |
2052 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2053 | if (spp->smk_port != port) | |
2054 | continue; | |
2055 | spp->smk_port = port; | |
2056 | spp->smk_sock = sk; | |
2057 | spp->smk_in = ssp->smk_in; | |
2058 | spp->smk_out = ssp->smk_out; | |
2059 | return; | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * A new port entry is required. | |
2064 | */ | |
2065 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2066 | if (spp == NULL) | |
2067 | return; | |
2068 | ||
2069 | spp->smk_port = port; | |
2070 | spp->smk_sock = sk; | |
2071 | spp->smk_in = ssp->smk_in; | |
2072 | spp->smk_out = ssp->smk_out; | |
2073 | ||
2074 | list_add(&spp->list, &smk_ipv6_port_list); | |
2075 | return; | |
2076 | } | |
2077 | ||
2078 | /** | |
2079 | * smk_ipv6_port_check - check Smack port access | |
2080 | * @sock: socket | |
2081 | * @address: address | |
2082 | * | |
2083 | * Create or update the port list entry | |
2084 | */ | |
6ea06247 | 2085 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2086 | int act) |
2087 | { | |
2088 | __be16 *bep; | |
2089 | __be32 *be32p; | |
c6739443 CS |
2090 | struct smk_port_label *spp; |
2091 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 2092 | struct smack_known *skp; |
c6739443 | 2093 | unsigned short port = 0; |
c6739443 CS |
2094 | char *object; |
2095 | struct smk_audit_info ad; | |
2096 | #ifdef CONFIG_AUDIT | |
2097 | struct lsm_network_audit net; | |
2098 | #endif | |
2099 | ||
2100 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2101 | skp = smack_net_ambient; |
c6739443 CS |
2102 | object = ssp->smk_in; |
2103 | } else { | |
2f823ff8 CS |
2104 | skp = ssp->smk_out; |
2105 | object = smack_net_ambient->smk_known; | |
c6739443 CS |
2106 | } |
2107 | ||
2108 | /* | |
2109 | * Get the IP address and port from the address. | |
2110 | */ | |
6ea06247 CS |
2111 | port = ntohs(address->sin6_port); |
2112 | bep = (__be16 *)(&address->sin6_addr); | |
2113 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2114 | |
2115 | /* | |
2116 | * It's remote, so port lookup does no good. | |
2117 | */ | |
2118 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2119 | goto auditout; | |
2120 | ||
2121 | /* | |
2122 | * It's local so the send check has to have passed. | |
2123 | */ | |
2124 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2125 | skp = &smack_known_web; |
c6739443 CS |
2126 | goto auditout; |
2127 | } | |
2128 | ||
2129 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2130 | if (spp->smk_port != port) | |
2131 | continue; | |
2132 | object = spp->smk_in; | |
2133 | if (act == SMK_CONNECTING) | |
2f823ff8 | 2134 | ssp->smk_packet = spp->smk_out->smk_known; |
c6739443 CS |
2135 | break; |
2136 | } | |
2137 | ||
2138 | auditout: | |
2139 | ||
2140 | #ifdef CONFIG_AUDIT | |
2141 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2142 | ad.a.u.net->family = sk->sk_family; | |
2143 | ad.a.u.net->dport = port; | |
2144 | if (act == SMK_RECEIVING) | |
6ea06247 | 2145 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2146 | else |
6ea06247 | 2147 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2148 | #endif |
2f823ff8 | 2149 | return smk_access(skp, object, MAY_WRITE, &ad); |
c6739443 CS |
2150 | } |
2151 | ||
e114e473 CS |
2152 | /** |
2153 | * smack_inode_setsecurity - set smack xattrs | |
2154 | * @inode: the object | |
2155 | * @name: attribute name | |
2156 | * @value: attribute value | |
2157 | * @size: size of the attribute | |
2158 | * @flags: unused | |
2159 | * | |
2160 | * Sets the named attribute in the appropriate blob | |
2161 | * | |
2162 | * Returns 0 on success, or an error code | |
2163 | */ | |
2164 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2165 | const void *value, size_t size, int flags) | |
2166 | { | |
2f823ff8 | 2167 | struct smack_known *skp; |
e114e473 CS |
2168 | struct inode_smack *nsp = inode->i_security; |
2169 | struct socket_smack *ssp; | |
2170 | struct socket *sock; | |
4bc87e62 | 2171 | int rc = 0; |
e114e473 | 2172 | |
f7112e6c | 2173 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2174 | return -EINVAL; |
e114e473 | 2175 | |
2f823ff8 CS |
2176 | skp = smk_import_entry(value, size); |
2177 | if (skp == NULL) | |
e114e473 CS |
2178 | return -EINVAL; |
2179 | ||
2180 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
2f823ff8 | 2181 | nsp->smk_inode = skp->smk_known; |
ddd29ec6 | 2182 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2183 | return 0; |
2184 | } | |
2185 | /* | |
2186 | * The rest of the Smack xattrs are only on sockets. | |
2187 | */ | |
2188 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2189 | return -EOPNOTSUPP; | |
2190 | ||
2191 | sock = SOCKET_I(inode); | |
2e1d146a | 2192 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2193 | return -EOPNOTSUPP; |
2194 | ||
2195 | ssp = sock->sk->sk_security; | |
2196 | ||
2197 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
2f823ff8 | 2198 | ssp->smk_in = skp->smk_known; |
e114e473 | 2199 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2200 | ssp->smk_out = skp; |
c6739443 | 2201 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2202 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2203 | if (rc != 0) | |
2204 | printk(KERN_WARNING | |
2205 | "Smack: \"%s\" netlbl error %d.\n", | |
2206 | __func__, -rc); | |
2207 | } | |
e114e473 CS |
2208 | } else |
2209 | return -EOPNOTSUPP; | |
2210 | ||
c6739443 CS |
2211 | if (sock->sk->sk_family == PF_INET6) |
2212 | smk_ipv6_port_label(sock, NULL); | |
2213 | ||
e114e473 CS |
2214 | return 0; |
2215 | } | |
2216 | ||
2217 | /** | |
2218 | * smack_socket_post_create - finish socket setup | |
2219 | * @sock: the socket | |
2220 | * @family: protocol family | |
2221 | * @type: unused | |
2222 | * @protocol: unused | |
2223 | * @kern: unused | |
2224 | * | |
2225 | * Sets the netlabel information on the socket | |
2226 | * | |
2227 | * Returns 0 on success, and error code otherwise | |
2228 | */ | |
2229 | static int smack_socket_post_create(struct socket *sock, int family, | |
2230 | int type, int protocol, int kern) | |
2231 | { | |
2e1d146a | 2232 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2233 | return 0; |
2234 | /* | |
2235 | * Set the outbound netlbl. | |
2236 | */ | |
6d3dc07c CS |
2237 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2238 | } | |
2239 | ||
c6739443 CS |
2240 | /** |
2241 | * smack_socket_bind - record port binding information. | |
2242 | * @sock: the socket | |
2243 | * @address: the port address | |
2244 | * @addrlen: size of the address | |
2245 | * | |
2246 | * Records the label bound to a port. | |
2247 | * | |
2248 | * Returns 0 | |
2249 | */ | |
2250 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2251 | int addrlen) | |
2252 | { | |
2253 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2254 | smk_ipv6_port_label(sock, address); | |
2255 | ||
2256 | return 0; | |
2257 | } | |
2258 | ||
6d3dc07c CS |
2259 | /** |
2260 | * smack_socket_connect - connect access check | |
2261 | * @sock: the socket | |
2262 | * @sap: the other end | |
2263 | * @addrlen: size of sap | |
2264 | * | |
2265 | * Verifies that a connection may be possible | |
2266 | * | |
2267 | * Returns 0 on success, and error code otherwise | |
2268 | */ | |
2269 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2270 | int addrlen) | |
2271 | { | |
c6739443 CS |
2272 | int rc = 0; |
2273 | ||
2274 | if (sock->sk == NULL) | |
6d3dc07c | 2275 | return 0; |
6d3dc07c | 2276 | |
c6739443 CS |
2277 | switch (sock->sk->sk_family) { |
2278 | case PF_INET: | |
2279 | if (addrlen < sizeof(struct sockaddr_in)) | |
2280 | return -EINVAL; | |
2281 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2282 | break; | |
2283 | case PF_INET6: | |
2284 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2285 | return -EINVAL; | |
6ea06247 CS |
2286 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2287 | SMK_CONNECTING); | |
c6739443 CS |
2288 | break; |
2289 | } | |
2290 | return rc; | |
e114e473 CS |
2291 | } |
2292 | ||
2293 | /** | |
2294 | * smack_flags_to_may - convert S_ to MAY_ values | |
2295 | * @flags: the S_ value | |
2296 | * | |
2297 | * Returns the equivalent MAY_ value | |
2298 | */ | |
2299 | static int smack_flags_to_may(int flags) | |
2300 | { | |
2301 | int may = 0; | |
2302 | ||
2303 | if (flags & S_IRUGO) | |
2304 | may |= MAY_READ; | |
2305 | if (flags & S_IWUGO) | |
2306 | may |= MAY_WRITE; | |
2307 | if (flags & S_IXUGO) | |
2308 | may |= MAY_EXEC; | |
2309 | ||
2310 | return may; | |
2311 | } | |
2312 | ||
2313 | /** | |
2314 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2315 | * @msg: the object | |
2316 | * | |
2317 | * Returns 0 | |
2318 | */ | |
2319 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2320 | { | |
2f823ff8 CS |
2321 | struct smack_known *skp = smk_of_current(); |
2322 | ||
2323 | msg->security = skp->smk_known; | |
e114e473 CS |
2324 | return 0; |
2325 | } | |
2326 | ||
2327 | /** | |
2328 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2329 | * @msg: the object | |
2330 | * | |
2331 | * Clears the blob pointer | |
2332 | */ | |
2333 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2334 | { | |
2335 | msg->security = NULL; | |
2336 | } | |
2337 | ||
2338 | /** | |
2339 | * smack_of_shm - the smack pointer for the shm | |
2340 | * @shp: the object | |
2341 | * | |
2342 | * Returns a pointer to the smack value | |
2343 | */ | |
2344 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2345 | { | |
2346 | return (char *)shp->shm_perm.security; | |
2347 | } | |
2348 | ||
2349 | /** | |
2350 | * smack_shm_alloc_security - Set the security blob for shm | |
2351 | * @shp: the object | |
2352 | * | |
2353 | * Returns 0 | |
2354 | */ | |
2355 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2356 | { | |
2357 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2358 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2359 | |
2f823ff8 | 2360 | isp->security = skp->smk_known; |
e114e473 CS |
2361 | return 0; |
2362 | } | |
2363 | ||
2364 | /** | |
2365 | * smack_shm_free_security - Clear the security blob for shm | |
2366 | * @shp: the object | |
2367 | * | |
2368 | * Clears the blob pointer | |
2369 | */ | |
2370 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2371 | { | |
2372 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2373 | ||
2374 | isp->security = NULL; | |
2375 | } | |
2376 | ||
ecfcc53f EB |
2377 | /** |
2378 | * smk_curacc_shm : check if current has access on shm | |
2379 | * @shp : the object | |
2380 | * @access : access requested | |
2381 | * | |
2382 | * Returns 0 if current has the requested access, error code otherwise | |
2383 | */ | |
2384 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2385 | { | |
2386 | char *ssp = smack_of_shm(shp); | |
2387 | struct smk_audit_info ad; | |
2388 | ||
2389 | #ifdef CONFIG_AUDIT | |
2390 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2391 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2392 | #endif | |
2393 | return smk_curacc(ssp, access, &ad); | |
2394 | } | |
2395 | ||
e114e473 CS |
2396 | /** |
2397 | * smack_shm_associate - Smack access check for shm | |
2398 | * @shp: the object | |
2399 | * @shmflg: access requested | |
2400 | * | |
2401 | * Returns 0 if current has the requested access, error code otherwise | |
2402 | */ | |
2403 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2404 | { | |
e114e473 CS |
2405 | int may; |
2406 | ||
2407 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2408 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2409 | } |
2410 | ||
2411 | /** | |
2412 | * smack_shm_shmctl - Smack access check for shm | |
2413 | * @shp: the object | |
2414 | * @cmd: what it wants to do | |
2415 | * | |
2416 | * Returns 0 if current has the requested access, error code otherwise | |
2417 | */ | |
2418 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2419 | { | |
e114e473 CS |
2420 | int may; |
2421 | ||
2422 | switch (cmd) { | |
2423 | case IPC_STAT: | |
2424 | case SHM_STAT: | |
2425 | may = MAY_READ; | |
2426 | break; | |
2427 | case IPC_SET: | |
2428 | case SHM_LOCK: | |
2429 | case SHM_UNLOCK: | |
2430 | case IPC_RMID: | |
2431 | may = MAY_READWRITE; | |
2432 | break; | |
2433 | case IPC_INFO: | |
2434 | case SHM_INFO: | |
2435 | /* | |
2436 | * System level information. | |
2437 | */ | |
2438 | return 0; | |
2439 | default: | |
2440 | return -EINVAL; | |
2441 | } | |
ecfcc53f | 2442 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2443 | } |
2444 | ||
2445 | /** | |
2446 | * smack_shm_shmat - Smack access for shmat | |
2447 | * @shp: the object | |
2448 | * @shmaddr: unused | |
2449 | * @shmflg: access requested | |
2450 | * | |
2451 | * Returns 0 if current has the requested access, error code otherwise | |
2452 | */ | |
2453 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2454 | int shmflg) | |
2455 | { | |
e114e473 CS |
2456 | int may; |
2457 | ||
2458 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2459 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2460 | } |
2461 | ||
2462 | /** | |
2463 | * smack_of_sem - the smack pointer for the sem | |
2464 | * @sma: the object | |
2465 | * | |
2466 | * Returns a pointer to the smack value | |
2467 | */ | |
2468 | static char *smack_of_sem(struct sem_array *sma) | |
2469 | { | |
2470 | return (char *)sma->sem_perm.security; | |
2471 | } | |
2472 | ||
2473 | /** | |
2474 | * smack_sem_alloc_security - Set the security blob for sem | |
2475 | * @sma: the object | |
2476 | * | |
2477 | * Returns 0 | |
2478 | */ | |
2479 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2480 | { | |
2481 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2482 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2483 | |
2f823ff8 | 2484 | isp->security = skp->smk_known; |
e114e473 CS |
2485 | return 0; |
2486 | } | |
2487 | ||
2488 | /** | |
2489 | * smack_sem_free_security - Clear the security blob for sem | |
2490 | * @sma: the object | |
2491 | * | |
2492 | * Clears the blob pointer | |
2493 | */ | |
2494 | static void smack_sem_free_security(struct sem_array *sma) | |
2495 | { | |
2496 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2497 | ||
2498 | isp->security = NULL; | |
2499 | } | |
2500 | ||
ecfcc53f EB |
2501 | /** |
2502 | * smk_curacc_sem : check if current has access on sem | |
2503 | * @sma : the object | |
2504 | * @access : access requested | |
2505 | * | |
2506 | * Returns 0 if current has the requested access, error code otherwise | |
2507 | */ | |
2508 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2509 | { | |
2510 | char *ssp = smack_of_sem(sma); | |
2511 | struct smk_audit_info ad; | |
2512 | ||
2513 | #ifdef CONFIG_AUDIT | |
2514 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2515 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2516 | #endif | |
2517 | return smk_curacc(ssp, access, &ad); | |
2518 | } | |
2519 | ||
e114e473 CS |
2520 | /** |
2521 | * smack_sem_associate - Smack access check for sem | |
2522 | * @sma: the object | |
2523 | * @semflg: access requested | |
2524 | * | |
2525 | * Returns 0 if current has the requested access, error code otherwise | |
2526 | */ | |
2527 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2528 | { | |
e114e473 CS |
2529 | int may; |
2530 | ||
2531 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2532 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2533 | } |
2534 | ||
2535 | /** | |
2536 | * smack_sem_shmctl - Smack access check for sem | |
2537 | * @sma: the object | |
2538 | * @cmd: what it wants to do | |
2539 | * | |
2540 | * Returns 0 if current has the requested access, error code otherwise | |
2541 | */ | |
2542 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2543 | { | |
e114e473 CS |
2544 | int may; |
2545 | ||
2546 | switch (cmd) { | |
2547 | case GETPID: | |
2548 | case GETNCNT: | |
2549 | case GETZCNT: | |
2550 | case GETVAL: | |
2551 | case GETALL: | |
2552 | case IPC_STAT: | |
2553 | case SEM_STAT: | |
2554 | may = MAY_READ; | |
2555 | break; | |
2556 | case SETVAL: | |
2557 | case SETALL: | |
2558 | case IPC_RMID: | |
2559 | case IPC_SET: | |
2560 | may = MAY_READWRITE; | |
2561 | break; | |
2562 | case IPC_INFO: | |
2563 | case SEM_INFO: | |
2564 | /* | |
2565 | * System level information | |
2566 | */ | |
2567 | return 0; | |
2568 | default: | |
2569 | return -EINVAL; | |
2570 | } | |
2571 | ||
ecfcc53f | 2572 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2573 | } |
2574 | ||
2575 | /** | |
2576 | * smack_sem_semop - Smack checks of semaphore operations | |
2577 | * @sma: the object | |
2578 | * @sops: unused | |
2579 | * @nsops: unused | |
2580 | * @alter: unused | |
2581 | * | |
2582 | * Treated as read and write in all cases. | |
2583 | * | |
2584 | * Returns 0 if access is allowed, error code otherwise | |
2585 | */ | |
2586 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2587 | unsigned nsops, int alter) | |
2588 | { | |
ecfcc53f | 2589 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2590 | } |
2591 | ||
2592 | /** | |
2593 | * smack_msg_alloc_security - Set the security blob for msg | |
2594 | * @msq: the object | |
2595 | * | |
2596 | * Returns 0 | |
2597 | */ | |
2598 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2599 | { | |
2600 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2601 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2602 | |
2f823ff8 | 2603 | kisp->security = skp->smk_known; |
e114e473 CS |
2604 | return 0; |
2605 | } | |
2606 | ||
2607 | /** | |
2608 | * smack_msg_free_security - Clear the security blob for msg | |
2609 | * @msq: the object | |
2610 | * | |
2611 | * Clears the blob pointer | |
2612 | */ | |
2613 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2614 | { | |
2615 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2616 | ||
2617 | kisp->security = NULL; | |
2618 | } | |
2619 | ||
2620 | /** | |
2621 | * smack_of_msq - the smack pointer for the msq | |
2622 | * @msq: the object | |
2623 | * | |
2624 | * Returns a pointer to the smack value | |
2625 | */ | |
2626 | static char *smack_of_msq(struct msg_queue *msq) | |
2627 | { | |
2628 | return (char *)msq->q_perm.security; | |
2629 | } | |
2630 | ||
ecfcc53f EB |
2631 | /** |
2632 | * smk_curacc_msq : helper to check if current has access on msq | |
2633 | * @msq : the msq | |
2634 | * @access : access requested | |
2635 | * | |
2636 | * return 0 if current has access, error otherwise | |
2637 | */ | |
2638 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2639 | { | |
2640 | char *msp = smack_of_msq(msq); | |
2641 | struct smk_audit_info ad; | |
2642 | ||
2643 | #ifdef CONFIG_AUDIT | |
2644 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2645 | ad.a.u.ipc_id = msq->q_perm.id; | |
2646 | #endif | |
2647 | return smk_curacc(msp, access, &ad); | |
2648 | } | |
2649 | ||
e114e473 CS |
2650 | /** |
2651 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2652 | * @msq: the object | |
2653 | * @msqflg: access requested | |
2654 | * | |
2655 | * Returns 0 if current has the requested access, error code otherwise | |
2656 | */ | |
2657 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2658 | { | |
e114e473 CS |
2659 | int may; |
2660 | ||
2661 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2662 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2663 | } |
2664 | ||
2665 | /** | |
2666 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2667 | * @msq: the object | |
2668 | * @cmd: what it wants to do | |
2669 | * | |
2670 | * Returns 0 if current has the requested access, error code otherwise | |
2671 | */ | |
2672 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2673 | { | |
e114e473 CS |
2674 | int may; |
2675 | ||
2676 | switch (cmd) { | |
2677 | case IPC_STAT: | |
2678 | case MSG_STAT: | |
2679 | may = MAY_READ; | |
2680 | break; | |
2681 | case IPC_SET: | |
2682 | case IPC_RMID: | |
2683 | may = MAY_READWRITE; | |
2684 | break; | |
2685 | case IPC_INFO: | |
2686 | case MSG_INFO: | |
2687 | /* | |
2688 | * System level information | |
2689 | */ | |
2690 | return 0; | |
2691 | default: | |
2692 | return -EINVAL; | |
2693 | } | |
2694 | ||
ecfcc53f | 2695 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2696 | } |
2697 | ||
2698 | /** | |
2699 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2700 | * @msq: the object | |
2701 | * @msg: unused | |
2702 | * @msqflg: access requested | |
2703 | * | |
2704 | * Returns 0 if current has the requested access, error code otherwise | |
2705 | */ | |
2706 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2707 | int msqflg) | |
2708 | { | |
ecfcc53f | 2709 | int may; |
e114e473 | 2710 | |
ecfcc53f EB |
2711 | may = smack_flags_to_may(msqflg); |
2712 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2713 | } |
2714 | ||
2715 | /** | |
2716 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2717 | * @msq: the object | |
2718 | * @msg: unused | |
2719 | * @target: unused | |
2720 | * @type: unused | |
2721 | * @mode: unused | |
2722 | * | |
2723 | * Returns 0 if current has read and write access, error code otherwise | |
2724 | */ | |
2725 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2726 | struct task_struct *target, long type, int mode) | |
2727 | { | |
ecfcc53f | 2728 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2729 | } |
2730 | ||
2731 | /** | |
2732 | * smack_ipc_permission - Smack access for ipc_permission() | |
2733 | * @ipp: the object permissions | |
2734 | * @flag: access requested | |
2735 | * | |
2736 | * Returns 0 if current has read and write access, error code otherwise | |
2737 | */ | |
2738 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2739 | { | |
2740 | char *isp = ipp->security; | |
ecfcc53f EB |
2741 | int may = smack_flags_to_may(flag); |
2742 | struct smk_audit_info ad; | |
e114e473 | 2743 | |
ecfcc53f EB |
2744 | #ifdef CONFIG_AUDIT |
2745 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2746 | ad.a.u.ipc_id = ipp->id; | |
2747 | #endif | |
2748 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2749 | } |
2750 | ||
d20bdda6 AD |
2751 | /** |
2752 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2753 | * @ipp: the object permissions |
d20bdda6 AD |
2754 | * @secid: where result will be saved |
2755 | */ | |
2756 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2757 | { | |
2758 | char *smack = ipp->security; | |
2759 | ||
2760 | *secid = smack_to_secid(smack); | |
2761 | } | |
2762 | ||
e114e473 CS |
2763 | /** |
2764 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2765 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2766 | * @inode: the object |
2767 | * | |
2768 | * Set the inode's security blob if it hasn't been done already. | |
2769 | */ | |
2770 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2771 | { | |
2772 | struct super_block *sbp; | |
2773 | struct superblock_smack *sbsp; | |
2774 | struct inode_smack *isp; | |
2f823ff8 CS |
2775 | struct smack_known *skp; |
2776 | struct smack_known *ckp = smk_of_current(); | |
e114e473 | 2777 | char *final; |
5c6d1125 JS |
2778 | char trattr[TRANS_TRUE_SIZE]; |
2779 | int transflag = 0; | |
2267b13a | 2780 | int rc; |
e114e473 CS |
2781 | struct dentry *dp; |
2782 | ||
2783 | if (inode == NULL) | |
2784 | return; | |
2785 | ||
2786 | isp = inode->i_security; | |
2787 | ||
2788 | mutex_lock(&isp->smk_lock); | |
2789 | /* | |
2790 | * If the inode is already instantiated | |
2791 | * take the quick way out | |
2792 | */ | |
2793 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2794 | goto unlockandout; | |
2795 | ||
2796 | sbp = inode->i_sb; | |
2797 | sbsp = sbp->s_security; | |
2798 | /* | |
2799 | * We're going to use the superblock default label | |
2800 | * if there's no label on the file. | |
2801 | */ | |
2802 | final = sbsp->smk_default; | |
2803 | ||
e97dcb0e CS |
2804 | /* |
2805 | * If this is the root inode the superblock | |
2806 | * may be in the process of initialization. | |
2807 | * If that is the case use the root value out | |
2808 | * of the superblock. | |
2809 | */ | |
2810 | if (opt_dentry->d_parent == opt_dentry) { | |
2811 | isp->smk_inode = sbsp->smk_root; | |
2812 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2813 | goto unlockandout; | |
2814 | } | |
2815 | ||
e114e473 CS |
2816 | /* |
2817 | * This is pretty hackish. | |
2818 | * Casey says that we shouldn't have to do | |
2819 | * file system specific code, but it does help | |
2820 | * with keeping it simple. | |
2821 | */ | |
2822 | switch (sbp->s_magic) { | |
2823 | case SMACK_MAGIC: | |
2824 | /* | |
25985edc | 2825 | * Casey says that it's a little embarrassing |
e114e473 CS |
2826 | * that the smack file system doesn't do |
2827 | * extended attributes. | |
2828 | */ | |
2829 | final = smack_known_star.smk_known; | |
2830 | break; | |
2831 | case PIPEFS_MAGIC: | |
2832 | /* | |
2833 | * Casey says pipes are easy (?) | |
2834 | */ | |
2835 | final = smack_known_star.smk_known; | |
2836 | break; | |
2837 | case DEVPTS_SUPER_MAGIC: | |
2838 | /* | |
2839 | * devpts seems content with the label of the task. | |
2840 | * Programs that change smack have to treat the | |
2841 | * pty with respect. | |
2842 | */ | |
2f823ff8 | 2843 | final = ckp->smk_known; |
e114e473 CS |
2844 | break; |
2845 | case SOCKFS_MAGIC: | |
2846 | /* | |
b4e0d5f0 CS |
2847 | * Socket access is controlled by the socket |
2848 | * structures associated with the task involved. | |
e114e473 | 2849 | */ |
b4e0d5f0 | 2850 | final = smack_known_star.smk_known; |
e114e473 CS |
2851 | break; |
2852 | case PROC_SUPER_MAGIC: | |
2853 | /* | |
2854 | * Casey says procfs appears not to care. | |
2855 | * The superblock default suffices. | |
2856 | */ | |
2857 | break; | |
2858 | case TMPFS_MAGIC: | |
2859 | /* | |
2860 | * Device labels should come from the filesystem, | |
2861 | * but watch out, because they're volitile, | |
2862 | * getting recreated on every reboot. | |
2863 | */ | |
2864 | final = smack_known_star.smk_known; | |
2865 | /* | |
2866 | * No break. | |
2867 | * | |
2868 | * If a smack value has been set we want to use it, | |
2869 | * but since tmpfs isn't giving us the opportunity | |
2870 | * to set mount options simulate setting the | |
2871 | * superblock default. | |
2872 | */ | |
2873 | default: | |
2874 | /* | |
2875 | * This isn't an understood special case. | |
2876 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2877 | */ |
2878 | ||
2879 | /* | |
2880 | * UNIX domain sockets use lower level socket data. | |
2881 | */ | |
2882 | if (S_ISSOCK(inode->i_mode)) { | |
2883 | final = smack_known_star.smk_known; | |
2884 | break; | |
2885 | } | |
2886 | /* | |
e114e473 CS |
2887 | * No xattr support means, alas, no SMACK label. |
2888 | * Use the aforeapplied default. | |
2889 | * It would be curious if the label of the task | |
2890 | * does not match that assigned. | |
2891 | */ | |
2892 | if (inode->i_op->getxattr == NULL) | |
2893 | break; | |
2894 | /* | |
2895 | * Get the dentry for xattr. | |
2896 | */ | |
3e62cbb8 | 2897 | dp = dget(opt_dentry); |
2f823ff8 CS |
2898 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
2899 | if (skp != NULL) | |
2900 | final = skp->smk_known; | |
2267b13a CS |
2901 | |
2902 | /* | |
2903 | * Transmuting directory | |
2904 | */ | |
2905 | if (S_ISDIR(inode->i_mode)) { | |
2906 | /* | |
2907 | * If this is a new directory and the label was | |
2908 | * transmuted when the inode was initialized | |
2909 | * set the transmute attribute on the directory | |
2910 | * and mark the inode. | |
2911 | * | |
2912 | * If there is a transmute attribute on the | |
2913 | * directory mark the inode. | |
2914 | */ | |
2915 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
2916 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
2917 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 2918 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
2919 | TRANS_TRUE, TRANS_TRUE_SIZE, |
2920 | 0); | |
2921 | } else { | |
2922 | rc = inode->i_op->getxattr(dp, | |
2923 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
2924 | TRANS_TRUE_SIZE); | |
2925 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
2926 | TRANS_TRUE_SIZE) != 0) | |
2927 | rc = -EINVAL; | |
5c6d1125 | 2928 | } |
2267b13a CS |
2929 | if (rc >= 0) |
2930 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 2931 | } |
19760ad0 CS |
2932 | /* |
2933 | * Don't let the exec or mmap label be "*" or "@". | |
2934 | */ | |
2935 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
2936 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2937 | skp = NULL; | |
2938 | isp->smk_task = skp; | |
2939 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); | |
2940 | if (skp == &smack_known_star || skp == &smack_known_web) | |
2941 | skp = NULL; | |
2942 | isp->smk_mmap = skp; | |
676dac4b | 2943 | |
e114e473 CS |
2944 | dput(dp); |
2945 | break; | |
2946 | } | |
2947 | ||
2948 | if (final == NULL) | |
2f823ff8 | 2949 | isp->smk_inode = ckp->smk_known; |
e114e473 CS |
2950 | else |
2951 | isp->smk_inode = final; | |
2952 | ||
5c6d1125 | 2953 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2954 | |
2955 | unlockandout: | |
2956 | mutex_unlock(&isp->smk_lock); | |
2957 | return; | |
2958 | } | |
2959 | ||
2960 | /** | |
2961 | * smack_getprocattr - Smack process attribute access | |
2962 | * @p: the object task | |
2963 | * @name: the name of the attribute in /proc/.../attr | |
2964 | * @value: where to put the result | |
2965 | * | |
2966 | * Places a copy of the task Smack into value | |
2967 | * | |
2968 | * Returns the length of the smack label or an error code | |
2969 | */ | |
2970 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2971 | { | |
2f823ff8 | 2972 | struct smack_known *skp = smk_of_task(task_security(p)); |
e114e473 CS |
2973 | char *cp; |
2974 | int slen; | |
2975 | ||
2976 | if (strcmp(name, "current") != 0) | |
2977 | return -EINVAL; | |
2978 | ||
2f823ff8 | 2979 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
2980 | if (cp == NULL) |
2981 | return -ENOMEM; | |
2982 | ||
2983 | slen = strlen(cp); | |
2984 | *value = cp; | |
2985 | return slen; | |
2986 | } | |
2987 | ||
2988 | /** | |
2989 | * smack_setprocattr - Smack process attribute setting | |
2990 | * @p: the object task | |
2991 | * @name: the name of the attribute in /proc/.../attr | |
2992 | * @value: the value to set | |
2993 | * @size: the size of the value | |
2994 | * | |
2995 | * Sets the Smack value of the task. Only setting self | |
2996 | * is permitted and only with privilege | |
2997 | * | |
2998 | * Returns the length of the smack label or an error code | |
2999 | */ | |
3000 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3001 | void *value, size_t size) | |
3002 | { | |
676dac4b | 3003 | struct task_smack *tsp; |
d84f4f99 | 3004 | struct cred *new; |
2f823ff8 | 3005 | struct smack_known *skp; |
e114e473 | 3006 | |
e114e473 CS |
3007 | /* |
3008 | * Changing another process' Smack value is too dangerous | |
3009 | * and supports no sane use case. | |
3010 | */ | |
3011 | if (p != current) | |
3012 | return -EPERM; | |
3013 | ||
1880eff7 | 3014 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3015 | return -EPERM; |
3016 | ||
f7112e6c | 3017 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3018 | return -EINVAL; |
3019 | ||
3020 | if (strcmp(name, "current") != 0) | |
3021 | return -EINVAL; | |
3022 | ||
2f823ff8 CS |
3023 | skp = smk_import_entry(value, size); |
3024 | if (skp == NULL) | |
e114e473 CS |
3025 | return -EINVAL; |
3026 | ||
6d3dc07c CS |
3027 | /* |
3028 | * No process is ever allowed the web ("@") label. | |
3029 | */ | |
2f823ff8 | 3030 | if (skp == &smack_known_web) |
6d3dc07c CS |
3031 | return -EPERM; |
3032 | ||
d84f4f99 | 3033 | new = prepare_creds(); |
6d3dc07c | 3034 | if (new == NULL) |
d84f4f99 | 3035 | return -ENOMEM; |
7898e1f8 | 3036 | |
46a2f3b9 | 3037 | tsp = new->security; |
2f823ff8 | 3038 | tsp->smk_task = skp; |
7898e1f8 | 3039 | |
d84f4f99 | 3040 | commit_creds(new); |
e114e473 CS |
3041 | return size; |
3042 | } | |
3043 | ||
3044 | /** | |
3045 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3046 | * @sock: one sock |
3047 | * @other: the other sock | |
e114e473 CS |
3048 | * @newsk: unused |
3049 | * | |
3050 | * Return 0 if a subject with the smack of sock could access | |
3051 | * an object with the smack of other, otherwise an error code | |
3052 | */ | |
3610cda5 DM |
3053 | static int smack_unix_stream_connect(struct sock *sock, |
3054 | struct sock *other, struct sock *newsk) | |
e114e473 | 3055 | { |
2f823ff8 | 3056 | struct smack_known *skp; |
d2e7ad19 JM |
3057 | struct socket_smack *ssp = sock->sk_security; |
3058 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3059 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3060 | struct smk_audit_info ad; |
b4e0d5f0 | 3061 | int rc = 0; |
e114e473 | 3062 | |
923e9a13 KC |
3063 | #ifdef CONFIG_AUDIT |
3064 | struct lsm_network_audit net; | |
3065 | ||
48c62af6 | 3066 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3610cda5 | 3067 | smk_ad_setfield_u_net_sk(&ad, other); |
923e9a13 | 3068 | #endif |
b4e0d5f0 | 3069 | |
2f823ff8 CS |
3070 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3071 | skp = ssp->smk_out; | |
3072 | rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad); | |
3073 | } | |
b4e0d5f0 | 3074 | |
975d5e55 CS |
3075 | /* |
3076 | * Cross reference the peer labels for SO_PEERSEC. | |
3077 | */ | |
3078 | if (rc == 0) { | |
2f823ff8 CS |
3079 | nsp->smk_packet = ssp->smk_out->smk_known; |
3080 | ssp->smk_packet = osp->smk_out->smk_known; | |
975d5e55 CS |
3081 | } |
3082 | ||
b4e0d5f0 | 3083 | return rc; |
e114e473 CS |
3084 | } |
3085 | ||
3086 | /** | |
3087 | * smack_unix_may_send - Smack access on UDS | |
3088 | * @sock: one socket | |
3089 | * @other: the other socket | |
3090 | * | |
3091 | * Return 0 if a subject with the smack of sock could access | |
3092 | * an object with the smack of other, otherwise an error code | |
3093 | */ | |
3094 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3095 | { | |
b4e0d5f0 CS |
3096 | struct socket_smack *ssp = sock->sk->sk_security; |
3097 | struct socket_smack *osp = other->sk->sk_security; | |
2f823ff8 | 3098 | struct smack_known *skp; |
ecfcc53f | 3099 | struct smk_audit_info ad; |
e114e473 | 3100 | |
923e9a13 KC |
3101 | #ifdef CONFIG_AUDIT |
3102 | struct lsm_network_audit net; | |
3103 | ||
48c62af6 | 3104 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3105 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3106 | #endif |
b4e0d5f0 | 3107 | |
2f823ff8 CS |
3108 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3109 | return 0; | |
b4e0d5f0 | 3110 | |
2f823ff8 CS |
3111 | skp = ssp->smk_out; |
3112 | return smk_access(skp, osp->smk_in, MAY_WRITE, &ad); | |
e114e473 CS |
3113 | } |
3114 | ||
6d3dc07c CS |
3115 | /** |
3116 | * smack_socket_sendmsg - Smack check based on destination host | |
3117 | * @sock: the socket | |
251a2a95 | 3118 | * @msg: the message |
6d3dc07c CS |
3119 | * @size: the size of the message |
3120 | * | |
c6739443 CS |
3121 | * Return 0 if the current subject can write to the destination host. |
3122 | * For IPv4 this is only a question if the destination is a single label host. | |
3123 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3124 | */ |
3125 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3126 | int size) | |
3127 | { | |
3128 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6ea06247 | 3129 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
c6739443 | 3130 | int rc = 0; |
6d3dc07c CS |
3131 | |
3132 | /* | |
3133 | * Perfectly reasonable for this to be NULL | |
3134 | */ | |
c6739443 | 3135 | if (sip == NULL) |
6d3dc07c CS |
3136 | return 0; |
3137 | ||
c6739443 CS |
3138 | switch (sip->sin_family) { |
3139 | case AF_INET: | |
3140 | rc = smack_netlabel_send(sock->sk, sip); | |
3141 | break; | |
3142 | case AF_INET6: | |
3143 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); | |
3144 | break; | |
3145 | } | |
3146 | return rc; | |
6d3dc07c CS |
3147 | } |
3148 | ||
e114e473 | 3149 | /** |
251a2a95 | 3150 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3151 | * @sap: netlabel secattr |
272cd7a8 | 3152 | * @ssp: socket security information |
e114e473 | 3153 | * |
2f823ff8 | 3154 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3155 | */ |
2f823ff8 CS |
3156 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3157 | struct socket_smack *ssp) | |
e114e473 | 3158 | { |
2f823ff8 | 3159 | struct smack_known *skp; |
f7112e6c | 3160 | int found = 0; |
677264e8 CS |
3161 | int acat; |
3162 | int kcat; | |
e114e473 | 3163 | |
6d3dc07c | 3164 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3165 | /* |
6d3dc07c | 3166 | * Looks like a CIPSO packet. |
e114e473 CS |
3167 | * If there are flags but no level netlabel isn't |
3168 | * behaving the way we expect it to. | |
3169 | * | |
f7112e6c | 3170 | * Look it up in the label table |
e114e473 CS |
3171 | * Without guidance regarding the smack value |
3172 | * for the packet fall back on the network | |
3173 | * ambient value. | |
3174 | */ | |
f7112e6c | 3175 | rcu_read_lock(); |
2f823ff8 CS |
3176 | list_for_each_entry(skp, &smack_known_list, list) { |
3177 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3178 | continue; |
677264e8 CS |
3179 | /* |
3180 | * Compare the catsets. Use the netlbl APIs. | |
3181 | */ | |
3182 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3183 | if ((skp->smk_netlabel.flags & | |
3184 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3185 | found = 1; | |
3186 | break; | |
3187 | } | |
3188 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
3189 | acat = netlbl_secattr_catmap_walk( | |
3190 | sap->attr.mls.cat, acat + 1); | |
3191 | kcat = netlbl_secattr_catmap_walk( | |
3192 | skp->smk_netlabel.attr.mls.cat, | |
3193 | kcat + 1); | |
3194 | if (acat < 0 || kcat < 0) | |
3195 | break; | |
3196 | } | |
3197 | if (acat == kcat) { | |
3198 | found = 1; | |
3199 | break; | |
3200 | } | |
6d3dc07c | 3201 | } |
f7112e6c CS |
3202 | rcu_read_unlock(); |
3203 | ||
3204 | if (found) | |
2f823ff8 | 3205 | return skp; |
f7112e6c | 3206 | |
272cd7a8 | 3207 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) |
2f823ff8 CS |
3208 | return &smack_known_web; |
3209 | return &smack_known_star; | |
e114e473 | 3210 | } |
6d3dc07c CS |
3211 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3212 | /* | |
3213 | * Looks like a fallback, which gives us a secid. | |
3214 | */ | |
2f823ff8 | 3215 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3216 | /* |
3217 | * This has got to be a bug because it is | |
3218 | * impossible to specify a fallback without | |
3219 | * specifying the label, which will ensure | |
3220 | * it has a secid, and the only way to get a | |
3221 | * secid is from a fallback. | |
3222 | */ | |
2f823ff8 CS |
3223 | BUG_ON(skp == NULL); |
3224 | return skp; | |
e114e473 CS |
3225 | } |
3226 | /* | |
6d3dc07c CS |
3227 | * Without guidance regarding the smack value |
3228 | * for the packet fall back on the network | |
3229 | * ambient value. | |
e114e473 | 3230 | */ |
272cd7a8 | 3231 | return smack_net_ambient; |
e114e473 CS |
3232 | } |
3233 | ||
6ea06247 | 3234 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3235 | { |
c6739443 CS |
3236 | u8 nexthdr; |
3237 | int offset; | |
3238 | int proto = -EINVAL; | |
3239 | struct ipv6hdr _ipv6h; | |
3240 | struct ipv6hdr *ip6; | |
3241 | __be16 frag_off; | |
3242 | struct tcphdr _tcph, *th; | |
3243 | struct udphdr _udph, *uh; | |
3244 | struct dccp_hdr _dccph, *dh; | |
3245 | ||
3246 | sip->sin6_port = 0; | |
3247 | ||
3248 | offset = skb_network_offset(skb); | |
3249 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3250 | if (ip6 == NULL) | |
3251 | return -EINVAL; | |
3252 | sip->sin6_addr = ip6->saddr; | |
3253 | ||
3254 | nexthdr = ip6->nexthdr; | |
3255 | offset += sizeof(_ipv6h); | |
3256 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3257 | if (offset < 0) | |
3258 | return -EINVAL; | |
3259 | ||
3260 | proto = nexthdr; | |
3261 | switch (proto) { | |
3262 | case IPPROTO_TCP: | |
3263 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3264 | if (th != NULL) | |
3265 | sip->sin6_port = th->source; | |
3266 | break; | |
3267 | case IPPROTO_UDP: | |
3268 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3269 | if (uh != NULL) | |
3270 | sip->sin6_port = uh->source; | |
3271 | break; | |
3272 | case IPPROTO_DCCP: | |
3273 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3274 | if (dh != NULL) | |
3275 | sip->sin6_port = dh->dccph_sport; | |
3276 | break; | |
3277 | } | |
3278 | return proto; | |
3279 | } | |
3280 | ||
e114e473 CS |
3281 | /** |
3282 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3283 | * @sk: socket | |
3284 | * @skb: packet | |
3285 | * | |
3286 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3287 | */ | |
3288 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3289 | { | |
3290 | struct netlbl_lsm_secattr secattr; | |
3291 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3292 | struct smack_known *skp; |
6ea06247 | 3293 | struct sockaddr_in6 sadd; |
c6739443 | 3294 | int rc = 0; |
ecfcc53f | 3295 | struct smk_audit_info ad; |
923e9a13 | 3296 | #ifdef CONFIG_AUDIT |
48c62af6 | 3297 | struct lsm_network_audit net; |
923e9a13 | 3298 | #endif |
c6739443 CS |
3299 | switch (sk->sk_family) { |
3300 | case PF_INET: | |
3301 | /* | |
3302 | * Translate what netlabel gave us. | |
3303 | */ | |
3304 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3305 | |
c6739443 CS |
3306 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3307 | if (rc == 0) | |
2f823ff8 | 3308 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3309 | else |
2f823ff8 | 3310 | skp = smack_net_ambient; |
6d3dc07c | 3311 | |
c6739443 | 3312 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3313 | |
ecfcc53f | 3314 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3315 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3316 | ad.a.u.net->family = sk->sk_family; | |
3317 | ad.a.u.net->netif = skb->skb_iif; | |
3318 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3319 | #endif |
c6739443 CS |
3320 | /* |
3321 | * Receiving a packet requires that the other end | |
3322 | * be able to write here. Read access is not required. | |
3323 | * This is the simplist possible security model | |
3324 | * for networking. | |
3325 | */ | |
2f823ff8 | 3326 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
c6739443 CS |
3327 | if (rc != 0) |
3328 | netlbl_skbuff_err(skb, rc, 0); | |
3329 | break; | |
3330 | case PF_INET6: | |
3331 | rc = smk_skb_to_addr_ipv6(skb, &sadd); | |
3332 | if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) | |
3333 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3334 | else | |
3335 | rc = 0; | |
3336 | break; | |
3337 | } | |
a8134296 | 3338 | return rc; |
e114e473 CS |
3339 | } |
3340 | ||
3341 | /** | |
3342 | * smack_socket_getpeersec_stream - pull in packet label | |
3343 | * @sock: the socket | |
3344 | * @optval: user's destination | |
3345 | * @optlen: size thereof | |
251a2a95 | 3346 | * @len: max thereof |
e114e473 CS |
3347 | * |
3348 | * returns zero on success, an error code otherwise | |
3349 | */ | |
3350 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3351 | char __user *optval, | |
3352 | int __user *optlen, unsigned len) | |
3353 | { | |
3354 | struct socket_smack *ssp; | |
272cd7a8 CS |
3355 | char *rcp = ""; |
3356 | int slen = 1; | |
e114e473 CS |
3357 | int rc = 0; |
3358 | ||
3359 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3360 | if (ssp->smk_packet != NULL) { |
3361 | rcp = ssp->smk_packet; | |
3362 | slen = strlen(rcp) + 1; | |
3363 | } | |
e114e473 CS |
3364 | |
3365 | if (slen > len) | |
3366 | rc = -ERANGE; | |
272cd7a8 | 3367 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3368 | rc = -EFAULT; |
3369 | ||
3370 | if (put_user(slen, optlen) != 0) | |
3371 | rc = -EFAULT; | |
3372 | ||
3373 | return rc; | |
3374 | } | |
3375 | ||
3376 | ||
3377 | /** | |
3378 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3379 | * @sock: the peer socket |
e114e473 CS |
3380 | * @skb: packet data |
3381 | * @secid: pointer to where to put the secid of the packet | |
3382 | * | |
3383 | * Sets the netlabel socket state on sk from parent | |
3384 | */ | |
3385 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3386 | struct sk_buff *skb, u32 *secid) | |
3387 | ||
3388 | { | |
3389 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3390 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3391 | struct smack_known *skp; |
b4e0d5f0 CS |
3392 | int family = PF_UNSPEC; |
3393 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3394 | int rc; |
3395 | ||
b4e0d5f0 CS |
3396 | if (skb != NULL) { |
3397 | if (skb->protocol == htons(ETH_P_IP)) | |
3398 | family = PF_INET; | |
3399 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3400 | family = PF_INET6; | |
e114e473 | 3401 | } |
b4e0d5f0 CS |
3402 | if (family == PF_UNSPEC && sock != NULL) |
3403 | family = sock->sk->sk_family; | |
e114e473 | 3404 | |
b4e0d5f0 | 3405 | if (family == PF_UNIX) { |
272cd7a8 | 3406 | ssp = sock->sk->sk_security; |
2f823ff8 | 3407 | s = ssp->smk_out->smk_secid; |
b4e0d5f0 CS |
3408 | } else if (family == PF_INET || family == PF_INET6) { |
3409 | /* | |
3410 | * Translate what netlabel gave us. | |
3411 | */ | |
272cd7a8 CS |
3412 | if (sock != NULL && sock->sk != NULL) |
3413 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3414 | netlbl_secattr_init(&secattr); |
3415 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3416 | if (rc == 0) { | |
2f823ff8 CS |
3417 | skp = smack_from_secattr(&secattr, ssp); |
3418 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3419 | } |
3420 | netlbl_secattr_destroy(&secattr); | |
3421 | } | |
3422 | *secid = s; | |
e114e473 CS |
3423 | if (s == 0) |
3424 | return -EINVAL; | |
e114e473 CS |
3425 | return 0; |
3426 | } | |
3427 | ||
3428 | /** | |
07feee8f PM |
3429 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3430 | * @sk: child sock | |
3431 | * @parent: parent socket | |
e114e473 | 3432 | * |
07feee8f PM |
3433 | * Set the smk_{in,out} state of an existing sock based on the process that |
3434 | * is creating the new socket. | |
e114e473 CS |
3435 | */ |
3436 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3437 | { | |
3438 | struct socket_smack *ssp; | |
2f823ff8 | 3439 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3440 | |
07feee8f PM |
3441 | if (sk == NULL || |
3442 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3443 | return; |
3444 | ||
3445 | ssp = sk->sk_security; | |
2f823ff8 CS |
3446 | ssp->smk_in = skp->smk_known; |
3447 | ssp->smk_out = skp; | |
07feee8f | 3448 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3449 | } |
3450 | ||
3451 | /** | |
3452 | * smack_inet_conn_request - Smack access check on connect | |
3453 | * @sk: socket involved | |
3454 | * @skb: packet | |
3455 | * @req: unused | |
3456 | * | |
3457 | * Returns 0 if a task with the packet label could write to | |
3458 | * the socket, otherwise an error code | |
3459 | */ | |
3460 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3461 | struct request_sock *req) | |
3462 | { | |
07feee8f | 3463 | u16 family = sk->sk_family; |
f7112e6c | 3464 | struct smack_known *skp; |
e114e473 | 3465 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3466 | struct netlbl_lsm_secattr secattr; |
3467 | struct sockaddr_in addr; | |
3468 | struct iphdr *hdr; | |
f7112e6c | 3469 | char *hsp; |
e114e473 | 3470 | int rc; |
ecfcc53f | 3471 | struct smk_audit_info ad; |
923e9a13 | 3472 | #ifdef CONFIG_AUDIT |
48c62af6 | 3473 | struct lsm_network_audit net; |
923e9a13 | 3474 | #endif |
e114e473 | 3475 | |
c6739443 CS |
3476 | if (family == PF_INET6) { |
3477 | /* | |
3478 | * Handle mapped IPv4 packets arriving | |
3479 | * via IPv6 sockets. Don't set up netlabel | |
3480 | * processing on IPv6. | |
3481 | */ | |
3482 | if (skb->protocol == htons(ETH_P_IP)) | |
3483 | family = PF_INET; | |
3484 | else | |
3485 | return 0; | |
3486 | } | |
e114e473 | 3487 | |
07feee8f PM |
3488 | netlbl_secattr_init(&secattr); |
3489 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3490 | if (rc == 0) |
2f823ff8 | 3491 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3492 | else |
2f823ff8 | 3493 | skp = &smack_known_huh; |
07feee8f PM |
3494 | netlbl_secattr_destroy(&secattr); |
3495 | ||
ecfcc53f | 3496 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3497 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3498 | ad.a.u.net->family = family; | |
3499 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3500 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3501 | #endif | |
e114e473 | 3502 | /* |
07feee8f PM |
3503 | * Receiving a packet requires that the other end be able to write |
3504 | * here. Read access is not required. | |
e114e473 | 3505 | */ |
2f823ff8 | 3506 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3507 | if (rc != 0) |
3508 | return rc; | |
3509 | ||
3510 | /* | |
3511 | * Save the peer's label in the request_sock so we can later setup | |
3512 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3513 | */ | |
2f823ff8 | 3514 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3515 | |
3516 | /* | |
3517 | * We need to decide if we want to label the incoming connection here | |
3518 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3519 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3520 | */ |
3521 | hdr = ip_hdr(skb); | |
3522 | addr.sin_addr.s_addr = hdr->saddr; | |
3523 | rcu_read_lock(); | |
f7112e6c CS |
3524 | hsp = smack_host_label(&addr); |
3525 | rcu_read_unlock(); | |
3526 | ||
2f823ff8 | 3527 | if (hsp == NULL) |
f7112e6c | 3528 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3529 | else |
07feee8f | 3530 | netlbl_req_delattr(req); |
e114e473 CS |
3531 | |
3532 | return rc; | |
3533 | } | |
3534 | ||
07feee8f PM |
3535 | /** |
3536 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3537 | * @sk: the new socket | |
3538 | * @req: the connection's request_sock | |
3539 | * | |
3540 | * Transfer the connection's peer label to the newly created socket. | |
3541 | */ | |
3542 | static void smack_inet_csk_clone(struct sock *sk, | |
3543 | const struct request_sock *req) | |
3544 | { | |
3545 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3546 | struct smack_known *skp; |
07feee8f | 3547 | |
2f823ff8 CS |
3548 | if (req->peer_secid != 0) { |
3549 | skp = smack_from_secid(req->peer_secid); | |
3550 | ssp->smk_packet = skp->smk_known; | |
3551 | } else | |
272cd7a8 | 3552 | ssp->smk_packet = NULL; |
07feee8f PM |
3553 | } |
3554 | ||
e114e473 CS |
3555 | /* |
3556 | * Key management security hooks | |
3557 | * | |
3558 | * Casey has not tested key support very heavily. | |
3559 | * The permission check is most likely too restrictive. | |
3560 | * If you care about keys please have a look. | |
3561 | */ | |
3562 | #ifdef CONFIG_KEYS | |
3563 | ||
3564 | /** | |
3565 | * smack_key_alloc - Set the key security blob | |
3566 | * @key: object | |
d84f4f99 | 3567 | * @cred: the credentials to use |
e114e473 CS |
3568 | * @flags: unused |
3569 | * | |
3570 | * No allocation required | |
3571 | * | |
3572 | * Returns 0 | |
3573 | */ | |
d84f4f99 | 3574 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3575 | unsigned long flags) |
3576 | { | |
2f823ff8 CS |
3577 | struct smack_known *skp = smk_of_task(cred->security); |
3578 | ||
3579 | key->security = skp->smk_known; | |
e114e473 CS |
3580 | return 0; |
3581 | } | |
3582 | ||
3583 | /** | |
3584 | * smack_key_free - Clear the key security blob | |
3585 | * @key: the object | |
3586 | * | |
3587 | * Clear the blob pointer | |
3588 | */ | |
3589 | static void smack_key_free(struct key *key) | |
3590 | { | |
3591 | key->security = NULL; | |
3592 | } | |
3593 | ||
3594 | /* | |
3595 | * smack_key_permission - Smack access on a key | |
3596 | * @key_ref: gets to the object | |
d84f4f99 | 3597 | * @cred: the credentials to use |
e114e473 CS |
3598 | * @perm: unused |
3599 | * | |
3600 | * Return 0 if the task has read and write to the object, | |
3601 | * an error code otherwise | |
3602 | */ | |
3603 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3604 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3605 | { |
3606 | struct key *keyp; | |
ecfcc53f | 3607 | struct smk_audit_info ad; |
2f823ff8 | 3608 | struct smack_known *tkp = smk_of_task(cred->security); |
e114e473 CS |
3609 | |
3610 | keyp = key_ref_to_ptr(key_ref); | |
3611 | if (keyp == NULL) | |
3612 | return -EINVAL; | |
3613 | /* | |
3614 | * If the key hasn't been initialized give it access so that | |
3615 | * it may do so. | |
3616 | */ | |
3617 | if (keyp->security == NULL) | |
3618 | return 0; | |
3619 | /* | |
3620 | * This should not occur | |
3621 | */ | |
2f823ff8 | 3622 | if (tkp == NULL) |
e114e473 | 3623 | return -EACCES; |
ecfcc53f EB |
3624 | #ifdef CONFIG_AUDIT |
3625 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3626 | ad.a.u.key_struct.key = keyp->serial; | |
3627 | ad.a.u.key_struct.key_desc = keyp->description; | |
3628 | #endif | |
2f823ff8 | 3629 | return smk_access(tkp, keyp->security, MAY_READWRITE, &ad); |
e114e473 CS |
3630 | } |
3631 | #endif /* CONFIG_KEYS */ | |
3632 | ||
d20bdda6 AD |
3633 | /* |
3634 | * Smack Audit hooks | |
3635 | * | |
3636 | * Audit requires a unique representation of each Smack specific | |
3637 | * rule. This unique representation is used to distinguish the | |
3638 | * object to be audited from remaining kernel objects and also | |
3639 | * works as a glue between the audit hooks. | |
3640 | * | |
3641 | * Since repository entries are added but never deleted, we'll use | |
3642 | * the smack_known label address related to the given audit rule as | |
3643 | * the needed unique representation. This also better fits the smack | |
3644 | * model where nearly everything is a label. | |
3645 | */ | |
3646 | #ifdef CONFIG_AUDIT | |
3647 | ||
3648 | /** | |
3649 | * smack_audit_rule_init - Initialize a smack audit rule | |
3650 | * @field: audit rule fields given from user-space (audit.h) | |
3651 | * @op: required testing operator (=, !=, >, <, ...) | |
3652 | * @rulestr: smack label to be audited | |
3653 | * @vrule: pointer to save our own audit rule representation | |
3654 | * | |
3655 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3656 | * The label to be audited is created if necessay. | |
3657 | */ | |
3658 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3659 | { | |
3660 | char **rule = (char **)vrule; | |
3661 | *rule = NULL; | |
3662 | ||
3663 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3664 | return -EINVAL; | |
3665 | ||
5af75d8d | 3666 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3667 | return -EINVAL; |
3668 | ||
3669 | *rule = smk_import(rulestr, 0); | |
3670 | ||
3671 | return 0; | |
3672 | } | |
3673 | ||
3674 | /** | |
3675 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3676 | * @krule: rule of interest, in Audit kernel representation format | |
3677 | * | |
3678 | * This is used to filter Smack rules from remaining Audit ones. | |
3679 | * If it's proved that this rule belongs to us, the | |
3680 | * audit_rule_match hook will be called to do the final judgement. | |
3681 | */ | |
3682 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3683 | { | |
3684 | struct audit_field *f; | |
3685 | int i; | |
3686 | ||
3687 | for (i = 0; i < krule->field_count; i++) { | |
3688 | f = &krule->fields[i]; | |
3689 | ||
3690 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3691 | return 1; | |
3692 | } | |
3693 | ||
3694 | return 0; | |
3695 | } | |
3696 | ||
3697 | /** | |
3698 | * smack_audit_rule_match - Audit given object ? | |
3699 | * @secid: security id for identifying the object to test | |
3700 | * @field: audit rule flags given from user-space | |
3701 | * @op: required testing operator | |
3702 | * @vrule: smack internal rule presentation | |
3703 | * @actx: audit context associated with the check | |
3704 | * | |
3705 | * The core Audit hook. It's used to take the decision of | |
3706 | * whether to audit or not to audit a given object. | |
3707 | */ | |
3708 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3709 | struct audit_context *actx) | |
3710 | { | |
2f823ff8 | 3711 | struct smack_known *skp; |
d20bdda6 AD |
3712 | char *rule = vrule; |
3713 | ||
3714 | if (!rule) { | |
ceffec55 | 3715 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
d20bdda6 AD |
3716 | "Smack: missing rule\n"); |
3717 | return -ENOENT; | |
3718 | } | |
3719 | ||
3720 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3721 | return 0; | |
3722 | ||
2f823ff8 | 3723 | skp = smack_from_secid(secid); |
d20bdda6 AD |
3724 | |
3725 | /* | |
3726 | * No need to do string comparisons. If a match occurs, | |
3727 | * both pointers will point to the same smack_known | |
3728 | * label. | |
3729 | */ | |
5af75d8d | 3730 | if (op == Audit_equal) |
2f823ff8 | 3731 | return (rule == skp->smk_known); |
5af75d8d | 3732 | if (op == Audit_not_equal) |
2f823ff8 | 3733 | return (rule != skp->smk_known); |
d20bdda6 AD |
3734 | |
3735 | return 0; | |
3736 | } | |
3737 | ||
3738 | /** | |
3739 | * smack_audit_rule_free - free smack rule representation | |
3740 | * @vrule: rule to be freed. | |
3741 | * | |
3742 | * No memory was allocated. | |
3743 | */ | |
3744 | static void smack_audit_rule_free(void *vrule) | |
3745 | { | |
3746 | /* No-op */ | |
3747 | } | |
3748 | ||
3749 | #endif /* CONFIG_AUDIT */ | |
3750 | ||
746df9b5 DQ |
3751 | /** |
3752 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
3753 | * @name: Full xattr name to check. | |
3754 | */ | |
3755 | static int smack_ismaclabel(const char *name) | |
3756 | { | |
3757 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
3758 | } | |
3759 | ||
3760 | ||
251a2a95 | 3761 | /** |
e114e473 CS |
3762 | * smack_secid_to_secctx - return the smack label for a secid |
3763 | * @secid: incoming integer | |
3764 | * @secdata: destination | |
3765 | * @seclen: how long it is | |
3766 | * | |
3767 | * Exists for networking code. | |
3768 | */ | |
3769 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3770 | { | |
2f823ff8 | 3771 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 3772 | |
d5630b9d | 3773 | if (secdata) |
2f823ff8 CS |
3774 | *secdata = skp->smk_known; |
3775 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
3776 | return 0; |
3777 | } | |
3778 | ||
251a2a95 | 3779 | /** |
4bc87e62 CS |
3780 | * smack_secctx_to_secid - return the secid for a smack label |
3781 | * @secdata: smack label | |
3782 | * @seclen: how long result is | |
3783 | * @secid: outgoing integer | |
3784 | * | |
3785 | * Exists for audit and networking code. | |
3786 | */ | |
e52c1764 | 3787 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3788 | { |
3789 | *secid = smack_to_secid(secdata); | |
3790 | return 0; | |
3791 | } | |
3792 | ||
251a2a95 | 3793 | /** |
e114e473 | 3794 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3795 | * @secdata: unused |
3796 | * @seclen: unused | |
e114e473 CS |
3797 | * |
3798 | * Exists to make sure nothing gets done, and properly | |
3799 | */ | |
3800 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3801 | { | |
3802 | } | |
3803 | ||
1ee65e37 DQ |
3804 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3805 | { | |
3806 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3807 | } | |
3808 | ||
3809 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3810 | { | |
3811 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3812 | } | |
3813 | ||
3814 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3815 | { | |
3816 | int len = 0; | |
3817 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3818 | ||
3819 | if (len < 0) | |
3820 | return len; | |
3821 | *ctxlen = len; | |
3822 | return 0; | |
3823 | } | |
3824 | ||
076c54c5 AD |
3825 | struct security_operations smack_ops = { |
3826 | .name = "smack", | |
3827 | ||
9e48858f | 3828 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3829 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3830 | .syslog = smack_syslog, |
e114e473 CS |
3831 | |
3832 | .sb_alloc_security = smack_sb_alloc_security, | |
3833 | .sb_free_security = smack_sb_free_security, | |
3834 | .sb_copy_data = smack_sb_copy_data, | |
3835 | .sb_kern_mount = smack_sb_kern_mount, | |
3836 | .sb_statfs = smack_sb_statfs, | |
e114e473 | 3837 | |
676dac4b | 3838 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3839 | .bprm_committing_creds = smack_bprm_committing_creds, |
3840 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3841 | |
e114e473 CS |
3842 | .inode_alloc_security = smack_inode_alloc_security, |
3843 | .inode_free_security = smack_inode_free_security, | |
3844 | .inode_init_security = smack_inode_init_security, | |
3845 | .inode_link = smack_inode_link, | |
3846 | .inode_unlink = smack_inode_unlink, | |
3847 | .inode_rmdir = smack_inode_rmdir, | |
3848 | .inode_rename = smack_inode_rename, | |
3849 | .inode_permission = smack_inode_permission, | |
3850 | .inode_setattr = smack_inode_setattr, | |
3851 | .inode_getattr = smack_inode_getattr, | |
3852 | .inode_setxattr = smack_inode_setxattr, | |
3853 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3854 | .inode_getxattr = smack_inode_getxattr, | |
3855 | .inode_removexattr = smack_inode_removexattr, | |
3856 | .inode_getsecurity = smack_inode_getsecurity, | |
3857 | .inode_setsecurity = smack_inode_setsecurity, | |
3858 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3859 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3860 | |
3861 | .file_permission = smack_file_permission, | |
3862 | .file_alloc_security = smack_file_alloc_security, | |
3863 | .file_free_security = smack_file_free_security, | |
3864 | .file_ioctl = smack_file_ioctl, | |
3865 | .file_lock = smack_file_lock, | |
3866 | .file_fcntl = smack_file_fcntl, | |
e5467859 AV |
3867 | .mmap_file = smack_mmap_file, |
3868 | .mmap_addr = cap_mmap_addr, | |
e114e473 CS |
3869 | .file_set_fowner = smack_file_set_fowner, |
3870 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3871 | .file_receive = smack_file_receive, | |
3872 | ||
83d49856 | 3873 | .file_open = smack_file_open, |
531f1d45 | 3874 | |
ee18d64c | 3875 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3876 | .cred_free = smack_cred_free, |
d84f4f99 | 3877 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3878 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3879 | .kernel_act_as = smack_kernel_act_as, |
3880 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3881 | .task_setpgid = smack_task_setpgid, |
3882 | .task_getpgid = smack_task_getpgid, | |
3883 | .task_getsid = smack_task_getsid, | |
3884 | .task_getsecid = smack_task_getsecid, | |
3885 | .task_setnice = smack_task_setnice, | |
3886 | .task_setioprio = smack_task_setioprio, | |
3887 | .task_getioprio = smack_task_getioprio, | |
3888 | .task_setscheduler = smack_task_setscheduler, | |
3889 | .task_getscheduler = smack_task_getscheduler, | |
3890 | .task_movememory = smack_task_movememory, | |
3891 | .task_kill = smack_task_kill, | |
3892 | .task_wait = smack_task_wait, | |
e114e473 CS |
3893 | .task_to_inode = smack_task_to_inode, |
3894 | ||
3895 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3896 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3897 | |
3898 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3899 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3900 | ||
3901 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3902 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3903 | .msg_queue_associate = smack_msg_queue_associate, | |
3904 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3905 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3906 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3907 | ||
3908 | .shm_alloc_security = smack_shm_alloc_security, | |
3909 | .shm_free_security = smack_shm_free_security, | |
3910 | .shm_associate = smack_shm_associate, | |
3911 | .shm_shmctl = smack_shm_shmctl, | |
3912 | .shm_shmat = smack_shm_shmat, | |
3913 | ||
3914 | .sem_alloc_security = smack_sem_alloc_security, | |
3915 | .sem_free_security = smack_sem_free_security, | |
3916 | .sem_associate = smack_sem_associate, | |
3917 | .sem_semctl = smack_sem_semctl, | |
3918 | .sem_semop = smack_sem_semop, | |
3919 | ||
e114e473 CS |
3920 | .d_instantiate = smack_d_instantiate, |
3921 | ||
3922 | .getprocattr = smack_getprocattr, | |
3923 | .setprocattr = smack_setprocattr, | |
3924 | ||
3925 | .unix_stream_connect = smack_unix_stream_connect, | |
3926 | .unix_may_send = smack_unix_may_send, | |
3927 | ||
3928 | .socket_post_create = smack_socket_post_create, | |
c6739443 | 3929 | .socket_bind = smack_socket_bind, |
6d3dc07c CS |
3930 | .socket_connect = smack_socket_connect, |
3931 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3932 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3933 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3934 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3935 | .sk_alloc_security = smack_sk_alloc_security, | |
3936 | .sk_free_security = smack_sk_free_security, | |
3937 | .sock_graft = smack_sock_graft, | |
3938 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3939 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3940 | |
e114e473 CS |
3941 | /* key management security hooks */ |
3942 | #ifdef CONFIG_KEYS | |
3943 | .key_alloc = smack_key_alloc, | |
3944 | .key_free = smack_key_free, | |
3945 | .key_permission = smack_key_permission, | |
3946 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3947 | |
3948 | /* Audit hooks */ | |
3949 | #ifdef CONFIG_AUDIT | |
3950 | .audit_rule_init = smack_audit_rule_init, | |
3951 | .audit_rule_known = smack_audit_rule_known, | |
3952 | .audit_rule_match = smack_audit_rule_match, | |
3953 | .audit_rule_free = smack_audit_rule_free, | |
3954 | #endif /* CONFIG_AUDIT */ | |
3955 | ||
746df9b5 | 3956 | .ismaclabel = smack_ismaclabel, |
e114e473 | 3957 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3958 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3959 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3960 | .inode_notifysecctx = smack_inode_notifysecctx, |
3961 | .inode_setsecctx = smack_inode_setsecctx, | |
3962 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3963 | }; |
3964 | ||
7198e2ee | 3965 | |
86812bb0 | 3966 | static __init void init_smack_known_list(void) |
7198e2ee | 3967 | { |
86812bb0 CS |
3968 | /* |
3969 | * Initialize rule list locks | |
3970 | */ | |
3971 | mutex_init(&smack_known_huh.smk_rules_lock); | |
3972 | mutex_init(&smack_known_hat.smk_rules_lock); | |
3973 | mutex_init(&smack_known_floor.smk_rules_lock); | |
3974 | mutex_init(&smack_known_star.smk_rules_lock); | |
3975 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
3976 | mutex_init(&smack_known_web.smk_rules_lock); | |
3977 | /* | |
3978 | * Initialize rule lists | |
3979 | */ | |
3980 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
3981 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
3982 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
3983 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
3984 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
3985 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
3986 | /* | |
3987 | * Create the known labels list | |
3988 | */ | |
4d7cf4a1 TS |
3989 | smk_insert_entry(&smack_known_huh); |
3990 | smk_insert_entry(&smack_known_hat); | |
3991 | smk_insert_entry(&smack_known_star); | |
3992 | smk_insert_entry(&smack_known_floor); | |
3993 | smk_insert_entry(&smack_known_invalid); | |
3994 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
3995 | } |
3996 | ||
e114e473 CS |
3997 | /** |
3998 | * smack_init - initialize the smack system | |
3999 | * | |
4000 | * Returns 0 | |
4001 | */ | |
4002 | static __init int smack_init(void) | |
4003 | { | |
d84f4f99 | 4004 | struct cred *cred; |
676dac4b | 4005 | struct task_smack *tsp; |
d84f4f99 | 4006 | |
7898e1f8 CS |
4007 | if (!security_module_enable(&smack_ops)) |
4008 | return 0; | |
4009 | ||
2f823ff8 CS |
4010 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4011 | GFP_KERNEL); | |
676dac4b CS |
4012 | if (tsp == NULL) |
4013 | return -ENOMEM; | |
4014 | ||
e114e473 CS |
4015 | printk(KERN_INFO "Smack: Initializing.\n"); |
4016 | ||
4017 | /* | |
4018 | * Set the security state for the initial task. | |
4019 | */ | |
d84f4f99 | 4020 | cred = (struct cred *) current->cred; |
676dac4b | 4021 | cred->security = tsp; |
e114e473 | 4022 | |
86812bb0 CS |
4023 | /* initialize the smack_known_list */ |
4024 | init_smack_known_list(); | |
e114e473 CS |
4025 | |
4026 | /* | |
4027 | * Register with LSM | |
4028 | */ | |
4029 | if (register_security(&smack_ops)) | |
4030 | panic("smack: Unable to register with kernel.\n"); | |
4031 | ||
4032 | return 0; | |
4033 | } | |
4034 | ||
4035 | /* | |
4036 | * Smack requires early initialization in order to label | |
4037 | * all processes and objects when they are created. | |
4038 | */ | |
4039 | security_initcall(smack_init); |