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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
44c2d9bd KK |
25 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
26 | * | |
27 | * Added support for bounds domain and audit messaged on masked permissions | |
28 | * | |
0719aaf5 GT |
29 | * Updated: Guido Trentalancia <guido@trentalancia.com> |
30 | * | |
31 | * Added support for runtime switching of the policy type | |
32 | * | |
44c2d9bd | 33 | * Copyright (C) 2008, 2009 NEC Corporation |
3bb56b25 | 34 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 35 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 36 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
37 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
38 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 39 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
40 | * the Free Software Foundation, version 2. |
41 | */ | |
42 | #include <linux/kernel.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/spinlock.h> | |
9f2ad665 | 46 | #include <linux/rcupdate.h> |
1da177e4 LT |
47 | #include <linux/errno.h> |
48 | #include <linux/in.h> | |
49 | #include <linux/sched.h> | |
50 | #include <linux/audit.h> | |
bb003079 | 51 | #include <linux/mutex.h> |
0e55a004 | 52 | #include <linux/selinux.h> |
6371dcd3 | 53 | #include <linux/flex_array.h> |
7420ed23 | 54 | #include <net/netlabel.h> |
bb003079 | 55 | |
1da177e4 LT |
56 | #include "flask.h" |
57 | #include "avc.h" | |
58 | #include "avc_ss.h" | |
59 | #include "security.h" | |
60 | #include "context.h" | |
61 | #include "policydb.h" | |
62 | #include "sidtab.h" | |
63 | #include "services.h" | |
64 | #include "conditional.h" | |
65 | #include "mls.h" | |
7420ed23 | 66 | #include "objsec.h" |
c60475bf | 67 | #include "netlabel.h" |
3de4bab5 | 68 | #include "xfrm.h" |
02752760 | 69 | #include "ebitmap.h" |
9d57a7f9 | 70 | #include "audit.h" |
1da177e4 LT |
71 | |
72 | extern void selnl_notify_policyload(u32 seqno); | |
1da177e4 | 73 | |
3bb56b25 | 74 | int selinux_policycap_netpeer; |
b0c636b9 | 75 | int selinux_policycap_openperm; |
3bb56b25 | 76 | |
1da177e4 | 77 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
78 | |
79 | static struct sidtab sidtab; | |
80 | struct policydb policydb; | |
5d55a345 | 81 | int ss_initialized; |
1da177e4 LT |
82 | |
83 | /* | |
84 | * The largest sequence number that has been used when | |
85 | * providing an access decision to the access vector cache. | |
86 | * The sequence number only changes when a policy change | |
87 | * occurs. | |
88 | */ | |
5d55a345 | 89 | static u32 latest_granting; |
1da177e4 LT |
90 | |
91 | /* Forward declaration. */ | |
92 | static int context_struct_to_string(struct context *context, char **scontext, | |
93 | u32 *scontext_len); | |
94 | ||
19439d05 SS |
95 | static void context_struct_compute_av(struct context *scontext, |
96 | struct context *tcontext, | |
97 | u16 tclass, | |
98 | struct av_decision *avd); | |
c6d3aaa4 SS |
99 | |
100 | struct selinux_mapping { | |
101 | u16 value; /* policy value */ | |
102 | unsigned num_perms; | |
103 | u32 perms[sizeof(u32) * 8]; | |
104 | }; | |
105 | ||
106 | static struct selinux_mapping *current_mapping; | |
107 | static u16 current_mapping_size; | |
108 | ||
109 | static int selinux_set_mapping(struct policydb *pol, | |
110 | struct security_class_mapping *map, | |
111 | struct selinux_mapping **out_map_p, | |
112 | u16 *out_map_size) | |
113 | { | |
114 | struct selinux_mapping *out_map = NULL; | |
115 | size_t size = sizeof(struct selinux_mapping); | |
116 | u16 i, j; | |
117 | unsigned k; | |
118 | bool print_unknown_handle = false; | |
119 | ||
120 | /* Find number of classes in the input mapping */ | |
121 | if (!map) | |
122 | return -EINVAL; | |
123 | i = 0; | |
124 | while (map[i].name) | |
125 | i++; | |
126 | ||
127 | /* Allocate space for the class records, plus one for class zero */ | |
128 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
129 | if (!out_map) | |
130 | return -ENOMEM; | |
131 | ||
132 | /* Store the raw class and permission values */ | |
133 | j = 0; | |
134 | while (map[j].name) { | |
135 | struct security_class_mapping *p_in = map + (j++); | |
136 | struct selinux_mapping *p_out = out_map + j; | |
137 | ||
138 | /* An empty class string skips ahead */ | |
139 | if (!strcmp(p_in->name, "")) { | |
140 | p_out->num_perms = 0; | |
141 | continue; | |
142 | } | |
143 | ||
144 | p_out->value = string_to_security_class(pol, p_in->name); | |
145 | if (!p_out->value) { | |
146 | printk(KERN_INFO | |
147 | "SELinux: Class %s not defined in policy.\n", | |
148 | p_in->name); | |
149 | if (pol->reject_unknown) | |
150 | goto err; | |
151 | p_out->num_perms = 0; | |
152 | print_unknown_handle = true; | |
153 | continue; | |
154 | } | |
155 | ||
156 | k = 0; | |
157 | while (p_in->perms && p_in->perms[k]) { | |
158 | /* An empty permission string skips ahead */ | |
159 | if (!*p_in->perms[k]) { | |
160 | k++; | |
161 | continue; | |
162 | } | |
163 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
164 | p_in->perms[k]); | |
165 | if (!p_out->perms[k]) { | |
166 | printk(KERN_INFO | |
167 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
168 | p_in->perms[k], p_in->name); | |
169 | if (pol->reject_unknown) | |
170 | goto err; | |
171 | print_unknown_handle = true; | |
172 | } | |
173 | ||
174 | k++; | |
175 | } | |
176 | p_out->num_perms = k; | |
177 | } | |
178 | ||
179 | if (print_unknown_handle) | |
180 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
181 | pol->allow_unknown ? "allowed" : "denied"); | |
182 | ||
183 | *out_map_p = out_map; | |
184 | *out_map_size = i; | |
185 | return 0; | |
186 | err: | |
187 | kfree(out_map); | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Get real, policy values from mapped values | |
193 | */ | |
194 | ||
195 | static u16 unmap_class(u16 tclass) | |
196 | { | |
197 | if (tclass < current_mapping_size) | |
198 | return current_mapping[tclass].value; | |
199 | ||
200 | return tclass; | |
201 | } | |
202 | ||
c6d3aaa4 SS |
203 | static void map_decision(u16 tclass, struct av_decision *avd, |
204 | int allow_unknown) | |
205 | { | |
206 | if (tclass < current_mapping_size) { | |
207 | unsigned i, n = current_mapping[tclass].num_perms; | |
208 | u32 result; | |
209 | ||
210 | for (i = 0, result = 0; i < n; i++) { | |
211 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
212 | result |= 1<<i; | |
213 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
214 | result |= 1<<i; | |
215 | } | |
216 | avd->allowed = result; | |
217 | ||
218 | for (i = 0, result = 0; i < n; i++) | |
219 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
220 | result |= 1<<i; | |
221 | avd->auditallow = result; | |
222 | ||
223 | for (i = 0, result = 0; i < n; i++) { | |
224 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
225 | result |= 1<<i; | |
226 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
227 | result |= 1<<i; | |
228 | } | |
0bce9527 EP |
229 | /* |
230 | * In case the kernel has a bug and requests a permission | |
231 | * between num_perms and the maximum permission number, we | |
232 | * should audit that denial | |
233 | */ | |
234 | for (; i < (sizeof(u32)*8); i++) | |
235 | result |= 1<<i; | |
c6d3aaa4 SS |
236 | avd->auditdeny = result; |
237 | } | |
238 | } | |
239 | ||
0719aaf5 GT |
240 | int security_mls_enabled(void) |
241 | { | |
242 | return policydb.mls_enabled; | |
243 | } | |
c6d3aaa4 | 244 | |
1da177e4 LT |
245 | /* |
246 | * Return the boolean value of a constraint expression | |
247 | * when it is applied to the specified source and target | |
248 | * security contexts. | |
249 | * | |
250 | * xcontext is a special beast... It is used by the validatetrans rules | |
251 | * only. For these rules, scontext is the context before the transition, | |
252 | * tcontext is the context after the transition, and xcontext is the context | |
253 | * of the process performing the transition. All other callers of | |
254 | * constraint_expr_eval should pass in NULL for xcontext. | |
255 | */ | |
256 | static int constraint_expr_eval(struct context *scontext, | |
257 | struct context *tcontext, | |
258 | struct context *xcontext, | |
259 | struct constraint_expr *cexpr) | |
260 | { | |
261 | u32 val1, val2; | |
262 | struct context *c; | |
263 | struct role_datum *r1, *r2; | |
264 | struct mls_level *l1, *l2; | |
265 | struct constraint_expr *e; | |
266 | int s[CEXPR_MAXDEPTH]; | |
267 | int sp = -1; | |
268 | ||
269 | for (e = cexpr; e; e = e->next) { | |
270 | switch (e->expr_type) { | |
271 | case CEXPR_NOT: | |
272 | BUG_ON(sp < 0); | |
273 | s[sp] = !s[sp]; | |
274 | break; | |
275 | case CEXPR_AND: | |
276 | BUG_ON(sp < 1); | |
277 | sp--; | |
c1a7368a | 278 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
279 | break; |
280 | case CEXPR_OR: | |
281 | BUG_ON(sp < 1); | |
282 | sp--; | |
c1a7368a | 283 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
284 | break; |
285 | case CEXPR_ATTR: | |
c1a7368a | 286 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
287 | return 0; |
288 | switch (e->attr) { | |
289 | case CEXPR_USER: | |
290 | val1 = scontext->user; | |
291 | val2 = tcontext->user; | |
292 | break; | |
293 | case CEXPR_TYPE: | |
294 | val1 = scontext->type; | |
295 | val2 = tcontext->type; | |
296 | break; | |
297 | case CEXPR_ROLE: | |
298 | val1 = scontext->role; | |
299 | val2 = tcontext->role; | |
300 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
301 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
302 | switch (e->op) { | |
303 | case CEXPR_DOM: | |
304 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
305 | val2 - 1); | |
306 | continue; | |
307 | case CEXPR_DOMBY: | |
308 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
309 | val1 - 1); | |
310 | continue; | |
311 | case CEXPR_INCOMP: | |
5d55a345 EP |
312 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
313 | val2 - 1) && | |
314 | !ebitmap_get_bit(&r2->dominates, | |
315 | val1 - 1)); | |
1da177e4 LT |
316 | continue; |
317 | default: | |
318 | break; | |
319 | } | |
320 | break; | |
321 | case CEXPR_L1L2: | |
322 | l1 = &(scontext->range.level[0]); | |
323 | l2 = &(tcontext->range.level[0]); | |
324 | goto mls_ops; | |
325 | case CEXPR_L1H2: | |
326 | l1 = &(scontext->range.level[0]); | |
327 | l2 = &(tcontext->range.level[1]); | |
328 | goto mls_ops; | |
329 | case CEXPR_H1L2: | |
330 | l1 = &(scontext->range.level[1]); | |
331 | l2 = &(tcontext->range.level[0]); | |
332 | goto mls_ops; | |
333 | case CEXPR_H1H2: | |
334 | l1 = &(scontext->range.level[1]); | |
335 | l2 = &(tcontext->range.level[1]); | |
336 | goto mls_ops; | |
337 | case CEXPR_L1H1: | |
338 | l1 = &(scontext->range.level[0]); | |
339 | l2 = &(scontext->range.level[1]); | |
340 | goto mls_ops; | |
341 | case CEXPR_L2H2: | |
342 | l1 = &(tcontext->range.level[0]); | |
343 | l2 = &(tcontext->range.level[1]); | |
344 | goto mls_ops; | |
345 | mls_ops: | |
346 | switch (e->op) { | |
347 | case CEXPR_EQ: | |
348 | s[++sp] = mls_level_eq(l1, l2); | |
349 | continue; | |
350 | case CEXPR_NEQ: | |
351 | s[++sp] = !mls_level_eq(l1, l2); | |
352 | continue; | |
353 | case CEXPR_DOM: | |
354 | s[++sp] = mls_level_dom(l1, l2); | |
355 | continue; | |
356 | case CEXPR_DOMBY: | |
357 | s[++sp] = mls_level_dom(l2, l1); | |
358 | continue; | |
359 | case CEXPR_INCOMP: | |
360 | s[++sp] = mls_level_incomp(l2, l1); | |
361 | continue; | |
362 | default: | |
363 | BUG(); | |
364 | return 0; | |
365 | } | |
366 | break; | |
367 | default: | |
368 | BUG(); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | switch (e->op) { | |
373 | case CEXPR_EQ: | |
374 | s[++sp] = (val1 == val2); | |
375 | break; | |
376 | case CEXPR_NEQ: | |
377 | s[++sp] = (val1 != val2); | |
378 | break; | |
379 | default: | |
380 | BUG(); | |
381 | return 0; | |
382 | } | |
383 | break; | |
384 | case CEXPR_NAMES: | |
385 | if (sp == (CEXPR_MAXDEPTH-1)) | |
386 | return 0; | |
387 | c = scontext; | |
388 | if (e->attr & CEXPR_TARGET) | |
389 | c = tcontext; | |
390 | else if (e->attr & CEXPR_XTARGET) { | |
391 | c = xcontext; | |
392 | if (!c) { | |
393 | BUG(); | |
394 | return 0; | |
395 | } | |
396 | } | |
397 | if (e->attr & CEXPR_USER) | |
398 | val1 = c->user; | |
399 | else if (e->attr & CEXPR_ROLE) | |
400 | val1 = c->role; | |
401 | else if (e->attr & CEXPR_TYPE) | |
402 | val1 = c->type; | |
403 | else { | |
404 | BUG(); | |
405 | return 0; | |
406 | } | |
407 | ||
408 | switch (e->op) { | |
409 | case CEXPR_EQ: | |
410 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
411 | break; | |
412 | case CEXPR_NEQ: | |
413 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
414 | break; | |
415 | default: | |
416 | BUG(); | |
417 | return 0; | |
418 | } | |
419 | break; | |
420 | default: | |
421 | BUG(); | |
422 | return 0; | |
423 | } | |
424 | } | |
425 | ||
426 | BUG_ON(sp != 0); | |
427 | return s[0]; | |
428 | } | |
429 | ||
44c2d9bd KK |
430 | /* |
431 | * security_dump_masked_av - dumps masked permissions during | |
432 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
433 | */ | |
434 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
435 | { | |
436 | struct perm_datum *pdatum = d; | |
437 | char **permission_names = args; | |
438 | ||
439 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
440 | ||
441 | permission_names[pdatum->value - 1] = (char *)k; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | static void security_dump_masked_av(struct context *scontext, | |
447 | struct context *tcontext, | |
448 | u16 tclass, | |
449 | u32 permissions, | |
450 | const char *reason) | |
451 | { | |
452 | struct common_datum *common_dat; | |
453 | struct class_datum *tclass_dat; | |
454 | struct audit_buffer *ab; | |
455 | char *tclass_name; | |
456 | char *scontext_name = NULL; | |
457 | char *tcontext_name = NULL; | |
458 | char *permission_names[32]; | |
2da5d31b JM |
459 | int index; |
460 | u32 length; | |
44c2d9bd KK |
461 | bool need_comma = false; |
462 | ||
463 | if (!permissions) | |
464 | return; | |
465 | ||
466 | tclass_name = policydb.p_class_val_to_name[tclass - 1]; | |
467 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; | |
468 | common_dat = tclass_dat->comdatum; | |
469 | ||
470 | /* init permission_names */ | |
471 | if (common_dat && | |
472 | hashtab_map(common_dat->permissions.table, | |
473 | dump_masked_av_helper, permission_names) < 0) | |
474 | goto out; | |
475 | ||
476 | if (hashtab_map(tclass_dat->permissions.table, | |
477 | dump_masked_av_helper, permission_names) < 0) | |
478 | goto out; | |
479 | ||
480 | /* get scontext/tcontext in text form */ | |
481 | if (context_struct_to_string(scontext, | |
482 | &scontext_name, &length) < 0) | |
483 | goto out; | |
484 | ||
485 | if (context_struct_to_string(tcontext, | |
486 | &tcontext_name, &length) < 0) | |
487 | goto out; | |
488 | ||
489 | /* audit a message */ | |
490 | ab = audit_log_start(current->audit_context, | |
491 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
492 | if (!ab) | |
493 | goto out; | |
494 | ||
495 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
496 | "scontext=%s tcontext=%s tclass=%s perms=", | |
497 | reason, scontext_name, tcontext_name, tclass_name); | |
498 | ||
499 | for (index = 0; index < 32; index++) { | |
500 | u32 mask = (1 << index); | |
501 | ||
502 | if ((mask & permissions) == 0) | |
503 | continue; | |
504 | ||
505 | audit_log_format(ab, "%s%s", | |
506 | need_comma ? "," : "", | |
507 | permission_names[index] | |
508 | ? permission_names[index] : "????"); | |
509 | need_comma = true; | |
510 | } | |
511 | audit_log_end(ab); | |
512 | out: | |
513 | /* release scontext/tcontext */ | |
514 | kfree(tcontext_name); | |
515 | kfree(scontext_name); | |
516 | ||
517 | return; | |
518 | } | |
519 | ||
d9250dea KK |
520 | /* |
521 | * security_boundary_permission - drops violated permissions | |
522 | * on boundary constraint. | |
523 | */ | |
524 | static void type_attribute_bounds_av(struct context *scontext, | |
525 | struct context *tcontext, | |
526 | u16 tclass, | |
d9250dea KK |
527 | struct av_decision *avd) |
528 | { | |
2ae3ba39 KK |
529 | struct context lo_scontext; |
530 | struct context lo_tcontext; | |
531 | struct av_decision lo_avd; | |
d9250dea KK |
532 | struct type_datum *source |
533 | = policydb.type_val_to_struct[scontext->type - 1]; | |
2ae3ba39 KK |
534 | struct type_datum *target |
535 | = policydb.type_val_to_struct[tcontext->type - 1]; | |
536 | u32 masked = 0; | |
d9250dea KK |
537 | |
538 | if (source->bounds) { | |
539 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
540 | ||
541 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
542 | lo_scontext.type = source->bounds; | |
543 | ||
544 | context_struct_compute_av(&lo_scontext, | |
545 | tcontext, | |
546 | tclass, | |
d9250dea KK |
547 | &lo_avd); |
548 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
549 | return; /* no masked permission */ | |
550 | masked = ~lo_avd.allowed & avd->allowed; | |
2ae3ba39 KK |
551 | } |
552 | ||
553 | if (target->bounds) { | |
554 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
555 | ||
556 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
557 | lo_tcontext.type = target->bounds; | |
558 | ||
559 | context_struct_compute_av(scontext, | |
560 | &lo_tcontext, | |
561 | tclass, | |
562 | &lo_avd); | |
563 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
564 | return; /* no masked permission */ | |
565 | masked = ~lo_avd.allowed & avd->allowed; | |
566 | } | |
567 | ||
568 | if (source->bounds && target->bounds) { | |
569 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
570 | /* | |
571 | * lo_scontext and lo_tcontext are already | |
572 | * set up. | |
573 | */ | |
574 | ||
575 | context_struct_compute_av(&lo_scontext, | |
576 | &lo_tcontext, | |
577 | tclass, | |
578 | &lo_avd); | |
579 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
580 | return; /* no masked permission */ | |
581 | masked = ~lo_avd.allowed & avd->allowed; | |
582 | } | |
d9250dea | 583 | |
2ae3ba39 | 584 | if (masked) { |
d9250dea KK |
585 | /* mask violated permissions */ |
586 | avd->allowed &= ~masked; | |
587 | ||
44c2d9bd KK |
588 | /* audit masked permissions */ |
589 | security_dump_masked_av(scontext, tcontext, | |
590 | tclass, masked, "bounds"); | |
d9250dea KK |
591 | } |
592 | } | |
593 | ||
1da177e4 LT |
594 | /* |
595 | * Compute access vectors based on a context structure pair for | |
596 | * the permissions in a particular class. | |
597 | */ | |
19439d05 SS |
598 | static void context_struct_compute_av(struct context *scontext, |
599 | struct context *tcontext, | |
600 | u16 tclass, | |
601 | struct av_decision *avd) | |
1da177e4 LT |
602 | { |
603 | struct constraint_node *constraint; | |
604 | struct role_allow *ra; | |
605 | struct avtab_key avkey; | |
782ebb99 | 606 | struct avtab_node *node; |
1da177e4 | 607 | struct class_datum *tclass_datum; |
782ebb99 SS |
608 | struct ebitmap *sattr, *tattr; |
609 | struct ebitmap_node *snode, *tnode; | |
610 | unsigned int i, j; | |
1da177e4 | 611 | |
1da177e4 | 612 | avd->allowed = 0; |
1da177e4 LT |
613 | avd->auditallow = 0; |
614 | avd->auditdeny = 0xffffffff; | |
1da177e4 | 615 | |
c6d3aaa4 SS |
616 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
617 | if (printk_ratelimit()) | |
618 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 619 | return; |
c6d3aaa4 | 620 | } |
3f12070e EP |
621 | |
622 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
623 | ||
1da177e4 LT |
624 | /* |
625 | * If a specific type enforcement rule was defined for | |
626 | * this permission check, then use it. | |
627 | */ | |
1da177e4 | 628 | avkey.target_class = tclass; |
782ebb99 | 629 | avkey.specified = AVTAB_AV; |
6371dcd3 EP |
630 | sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1); |
631 | BUG_ON(!sattr); | |
632 | tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1); | |
633 | BUG_ON(!tattr); | |
9fe79ad1 KK |
634 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
635 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
636 | avkey.source_type = i + 1; |
637 | avkey.target_type = j + 1; | |
638 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 639 | node; |
782ebb99 SS |
640 | node = avtab_search_node_next(node, avkey.specified)) { |
641 | if (node->key.specified == AVTAB_ALLOWED) | |
642 | avd->allowed |= node->datum.data; | |
643 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
644 | avd->auditallow |= node->datum.data; | |
645 | else if (node->key.specified == AVTAB_AUDITDENY) | |
646 | avd->auditdeny &= node->datum.data; | |
647 | } | |
1da177e4 | 648 | |
782ebb99 SS |
649 | /* Check conditional av table for additional permissions */ |
650 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
651 | ||
652 | } | |
653 | } | |
1da177e4 LT |
654 | |
655 | /* | |
656 | * Remove any permissions prohibited by a constraint (this includes | |
657 | * the MLS policy). | |
658 | */ | |
659 | constraint = tclass_datum->constraints; | |
660 | while (constraint) { | |
661 | if ((constraint->permissions & (avd->allowed)) && | |
662 | !constraint_expr_eval(scontext, tcontext, NULL, | |
663 | constraint->expr)) { | |
caabbdc0 | 664 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
665 | } |
666 | constraint = constraint->next; | |
667 | } | |
668 | ||
669 | /* | |
670 | * If checking process transition permission and the | |
671 | * role is changing, then check the (current_role, new_role) | |
672 | * pair. | |
673 | */ | |
c6d3aaa4 SS |
674 | if (tclass == policydb.process_class && |
675 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
676 | scontext->role != tcontext->role) { |
677 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
678 | if (scontext->role == ra->role && | |
679 | tcontext->role == ra->new_role) | |
680 | break; | |
681 | } | |
682 | if (!ra) | |
c6d3aaa4 | 683 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
684 | } |
685 | ||
d9250dea KK |
686 | /* |
687 | * If the given source and target types have boundary | |
688 | * constraint, lazy checks have to mask any violated | |
689 | * permission and notice it to userspace via audit. | |
690 | */ | |
691 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 692 | tclass, avd); |
1da177e4 LT |
693 | } |
694 | ||
695 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
696 | struct context *ncontext, |
697 | struct context *tcontext, | |
698 | u16 tclass) | |
1da177e4 LT |
699 | { |
700 | char *o = NULL, *n = NULL, *t = NULL; | |
701 | u32 olen, nlen, tlen; | |
702 | ||
703 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
704 | goto out; | |
705 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
706 | goto out; | |
707 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
708 | goto out; | |
9ad9ad38 | 709 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
710 | "security_validate_transition: denied for" |
711 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
712 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
713 | out: |
714 | kfree(o); | |
715 | kfree(n); | |
716 | kfree(t); | |
717 | ||
718 | if (!selinux_enforcing) | |
719 | return 0; | |
720 | return -EPERM; | |
721 | } | |
722 | ||
723 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 724 | u16 orig_tclass) |
1da177e4 LT |
725 | { |
726 | struct context *ocontext; | |
727 | struct context *ncontext; | |
728 | struct context *tcontext; | |
729 | struct class_datum *tclass_datum; | |
730 | struct constraint_node *constraint; | |
c6d3aaa4 | 731 | u16 tclass; |
1da177e4 LT |
732 | int rc = 0; |
733 | ||
734 | if (!ss_initialized) | |
735 | return 0; | |
736 | ||
0804d113 | 737 | read_lock(&policy_rwlock); |
1da177e4 | 738 | |
c6d3aaa4 SS |
739 | tclass = unmap_class(orig_tclass); |
740 | ||
1da177e4 | 741 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
742 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
743 | __func__, tclass); | |
1da177e4 LT |
744 | rc = -EINVAL; |
745 | goto out; | |
746 | } | |
747 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
748 | ||
749 | ocontext = sidtab_search(&sidtab, oldsid); | |
750 | if (!ocontext) { | |
744ba35e EP |
751 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
752 | __func__, oldsid); | |
1da177e4 LT |
753 | rc = -EINVAL; |
754 | goto out; | |
755 | } | |
756 | ||
757 | ncontext = sidtab_search(&sidtab, newsid); | |
758 | if (!ncontext) { | |
744ba35e EP |
759 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
760 | __func__, newsid); | |
1da177e4 LT |
761 | rc = -EINVAL; |
762 | goto out; | |
763 | } | |
764 | ||
765 | tcontext = sidtab_search(&sidtab, tasksid); | |
766 | if (!tcontext) { | |
744ba35e EP |
767 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
768 | __func__, tasksid); | |
1da177e4 LT |
769 | rc = -EINVAL; |
770 | goto out; | |
771 | } | |
772 | ||
773 | constraint = tclass_datum->validatetrans; | |
774 | while (constraint) { | |
775 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 776 | constraint->expr)) { |
1da177e4 | 777 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 778 | tcontext, tclass); |
1da177e4 LT |
779 | goto out; |
780 | } | |
781 | constraint = constraint->next; | |
782 | } | |
783 | ||
784 | out: | |
0804d113 | 785 | read_unlock(&policy_rwlock); |
1da177e4 LT |
786 | return rc; |
787 | } | |
788 | ||
d9250dea KK |
789 | /* |
790 | * security_bounded_transition - check whether the given | |
791 | * transition is directed to bounded, or not. | |
792 | * It returns 0, if @newsid is bounded by @oldsid. | |
793 | * Otherwise, it returns error code. | |
794 | * | |
795 | * @oldsid : current security identifier | |
796 | * @newsid : destinated security identifier | |
797 | */ | |
798 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
799 | { | |
800 | struct context *old_context, *new_context; | |
801 | struct type_datum *type; | |
802 | int index; | |
803 | int rc = -EINVAL; | |
804 | ||
805 | read_lock(&policy_rwlock); | |
806 | ||
807 | old_context = sidtab_search(&sidtab, old_sid); | |
808 | if (!old_context) { | |
809 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
810 | __func__, old_sid); | |
811 | goto out; | |
812 | } | |
813 | ||
814 | new_context = sidtab_search(&sidtab, new_sid); | |
815 | if (!new_context) { | |
816 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
817 | __func__, new_sid); | |
818 | goto out; | |
819 | } | |
820 | ||
af901ca1 | 821 | /* type/domain unchanged */ |
d9250dea KK |
822 | if (old_context->type == new_context->type) { |
823 | rc = 0; | |
824 | goto out; | |
825 | } | |
826 | ||
827 | index = new_context->type; | |
828 | while (true) { | |
829 | type = policydb.type_val_to_struct[index - 1]; | |
830 | BUG_ON(!type); | |
831 | ||
832 | /* not bounded anymore */ | |
833 | if (!type->bounds) { | |
834 | rc = -EPERM; | |
835 | break; | |
836 | } | |
837 | ||
838 | /* @newsid is bounded by @oldsid */ | |
839 | if (type->bounds == old_context->type) { | |
840 | rc = 0; | |
841 | break; | |
842 | } | |
843 | index = type->bounds; | |
844 | } | |
44c2d9bd KK |
845 | |
846 | if (rc) { | |
847 | char *old_name = NULL; | |
848 | char *new_name = NULL; | |
2da5d31b | 849 | u32 length; |
44c2d9bd KK |
850 | |
851 | if (!context_struct_to_string(old_context, | |
852 | &old_name, &length) && | |
853 | !context_struct_to_string(new_context, | |
854 | &new_name, &length)) { | |
855 | audit_log(current->audit_context, | |
856 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
857 | "op=security_bounded_transition " | |
858 | "result=denied " | |
859 | "oldcontext=%s newcontext=%s", | |
860 | old_name, new_name); | |
861 | } | |
862 | kfree(new_name); | |
863 | kfree(old_name); | |
864 | } | |
d9250dea KK |
865 | out: |
866 | read_unlock(&policy_rwlock); | |
867 | ||
868 | return rc; | |
869 | } | |
870 | ||
19439d05 | 871 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 872 | { |
19439d05 SS |
873 | avd->allowed = 0; |
874 | avd->auditallow = 0; | |
875 | avd->auditdeny = 0xffffffff; | |
876 | avd->seqno = latest_granting; | |
877 | avd->flags = 0; | |
c6d3aaa4 SS |
878 | } |
879 | ||
19439d05 | 880 | |
1da177e4 LT |
881 | /** |
882 | * security_compute_av - Compute access vector decisions. | |
883 | * @ssid: source security identifier | |
884 | * @tsid: target security identifier | |
885 | * @tclass: target security class | |
1da177e4 LT |
886 | * @avd: access vector decisions |
887 | * | |
888 | * Compute a set of access vector decisions based on the | |
889 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 890 | */ |
19439d05 SS |
891 | void security_compute_av(u32 ssid, |
892 | u32 tsid, | |
893 | u16 orig_tclass, | |
894 | struct av_decision *avd) | |
1da177e4 | 895 | { |
c6d3aaa4 | 896 | u16 tclass; |
19439d05 | 897 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 898 | |
b7f3008a | 899 | read_lock(&policy_rwlock); |
19439d05 | 900 | avd_init(avd); |
c6d3aaa4 SS |
901 | if (!ss_initialized) |
902 | goto allow; | |
903 | ||
19439d05 SS |
904 | scontext = sidtab_search(&sidtab, ssid); |
905 | if (!scontext) { | |
906 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
907 | __func__, ssid); | |
908 | goto out; | |
909 | } | |
910 | ||
911 | /* permissive domain? */ | |
912 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
913 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
914 | ||
915 | tcontext = sidtab_search(&sidtab, tsid); | |
916 | if (!tcontext) { | |
917 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
918 | __func__, tsid); | |
919 | goto out; | |
920 | } | |
921 | ||
c6d3aaa4 SS |
922 | tclass = unmap_class(orig_tclass); |
923 | if (unlikely(orig_tclass && !tclass)) { | |
924 | if (policydb.allow_unknown) | |
925 | goto allow; | |
b7f3008a | 926 | goto out; |
c6d3aaa4 | 927 | } |
19439d05 | 928 | context_struct_compute_av(scontext, tcontext, tclass, avd); |
c6d3aaa4 | 929 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 930 | out: |
c6d3aaa4 | 931 | read_unlock(&policy_rwlock); |
19439d05 | 932 | return; |
c6d3aaa4 SS |
933 | allow: |
934 | avd->allowed = 0xffffffff; | |
b7f3008a | 935 | goto out; |
c6d3aaa4 SS |
936 | } |
937 | ||
19439d05 SS |
938 | void security_compute_av_user(u32 ssid, |
939 | u32 tsid, | |
940 | u16 tclass, | |
941 | struct av_decision *avd) | |
c6d3aaa4 | 942 | { |
19439d05 | 943 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 944 | |
19439d05 SS |
945 | read_lock(&policy_rwlock); |
946 | avd_init(avd); | |
947 | if (!ss_initialized) | |
948 | goto allow; | |
949 | ||
950 | scontext = sidtab_search(&sidtab, ssid); | |
951 | if (!scontext) { | |
952 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
953 | __func__, ssid); | |
954 | goto out; | |
1da177e4 LT |
955 | } |
956 | ||
19439d05 SS |
957 | /* permissive domain? */ |
958 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
959 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
960 | ||
961 | tcontext = sidtab_search(&sidtab, tsid); | |
962 | if (!tcontext) { | |
963 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
964 | __func__, tsid); | |
965 | goto out; | |
966 | } | |
967 | ||
968 | if (unlikely(!tclass)) { | |
969 | if (policydb.allow_unknown) | |
970 | goto allow; | |
971 | goto out; | |
972 | } | |
973 | ||
974 | context_struct_compute_av(scontext, tcontext, tclass, avd); | |
975 | out: | |
0804d113 | 976 | read_unlock(&policy_rwlock); |
19439d05 SS |
977 | return; |
978 | allow: | |
979 | avd->allowed = 0xffffffff; | |
980 | goto out; | |
1da177e4 LT |
981 | } |
982 | ||
983 | /* | |
984 | * Write the security context string representation of | |
985 | * the context structure `context' into a dynamically | |
986 | * allocated string of the correct size. Set `*scontext' | |
987 | * to point to this string and set `*scontext_len' to | |
988 | * the length of the string. | |
989 | */ | |
990 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
991 | { | |
992 | char *scontextp; | |
993 | ||
d5630b9d EP |
994 | if (scontext) |
995 | *scontext = NULL; | |
1da177e4 LT |
996 | *scontext_len = 0; |
997 | ||
12b29f34 SS |
998 | if (context->len) { |
999 | *scontext_len = context->len; | |
1000 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1001 | if (!(*scontext)) | |
1002 | return -ENOMEM; | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1da177e4 LT |
1006 | /* Compute the size of the context. */ |
1007 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
1008 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
1009 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
1010 | *scontext_len += mls_compute_context_len(context); | |
1011 | ||
d5630b9d EP |
1012 | if (!scontext) |
1013 | return 0; | |
1014 | ||
1da177e4 LT |
1015 | /* Allocate space for the context; caller must free this space. */ |
1016 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1017 | if (!scontextp) |
1da177e4 | 1018 | return -ENOMEM; |
1da177e4 LT |
1019 | *scontext = scontextp; |
1020 | ||
1021 | /* | |
1022 | * Copy the user name, role name and type name into the context. | |
1023 | */ | |
1024 | sprintf(scontextp, "%s:%s:%s", | |
1025 | policydb.p_user_val_to_name[context->user - 1], | |
1026 | policydb.p_role_val_to_name[context->role - 1], | |
1027 | policydb.p_type_val_to_name[context->type - 1]); | |
1028 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
1029 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
1030 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
1031 | |
1032 | mls_sid_to_context(context, &scontextp); | |
1033 | ||
1034 | *scontextp = 0; | |
1035 | ||
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | #include "initial_sid_to_string.h" | |
1040 | ||
f0ee2e46 JC |
1041 | const char *security_get_initial_sid_context(u32 sid) |
1042 | { | |
1043 | if (unlikely(sid > SECINITSID_NUM)) | |
1044 | return NULL; | |
1045 | return initial_sid_to_string[sid]; | |
1046 | } | |
1047 | ||
12b29f34 SS |
1048 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1049 | u32 *scontext_len, int force) | |
1da177e4 LT |
1050 | { |
1051 | struct context *context; | |
1052 | int rc = 0; | |
1053 | ||
d5630b9d EP |
1054 | if (scontext) |
1055 | *scontext = NULL; | |
4f4acf3a SS |
1056 | *scontext_len = 0; |
1057 | ||
1da177e4 LT |
1058 | if (!ss_initialized) { |
1059 | if (sid <= SECINITSID_NUM) { | |
1060 | char *scontextp; | |
1061 | ||
1062 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1063 | if (!scontext) |
1064 | goto out; | |
5d55a345 | 1065 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1066 | if (!scontextp) { |
1067 | rc = -ENOMEM; | |
1068 | goto out; | |
1069 | } | |
1da177e4 LT |
1070 | strcpy(scontextp, initial_sid_to_string[sid]); |
1071 | *scontext = scontextp; | |
1072 | goto out; | |
1073 | } | |
744ba35e EP |
1074 | printk(KERN_ERR "SELinux: %s: called before initial " |
1075 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1076 | rc = -EINVAL; |
1077 | goto out; | |
1078 | } | |
0804d113 | 1079 | read_lock(&policy_rwlock); |
12b29f34 SS |
1080 | if (force) |
1081 | context = sidtab_search_force(&sidtab, sid); | |
1082 | else | |
1083 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1084 | if (!context) { |
744ba35e EP |
1085 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1086 | __func__, sid); | |
1da177e4 LT |
1087 | rc = -EINVAL; |
1088 | goto out_unlock; | |
1089 | } | |
1090 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1091 | out_unlock: | |
0804d113 | 1092 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1093 | out: |
1094 | return rc; | |
1095 | ||
1096 | } | |
1097 | ||
12b29f34 SS |
1098 | /** |
1099 | * security_sid_to_context - Obtain a context for a given SID. | |
1100 | * @sid: security identifier, SID | |
1101 | * @scontext: security context | |
1102 | * @scontext_len: length in bytes | |
1103 | * | |
1104 | * Write the string representation of the context associated with @sid | |
1105 | * into a dynamically allocated string of the correct size. Set @scontext | |
1106 | * to point to this string and set @scontext_len to the length of the string. | |
1107 | */ | |
1108 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1109 | { |
12b29f34 SS |
1110 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1111 | } | |
1112 | ||
1113 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1114 | { | |
1115 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1116 | } | |
1117 | ||
9a59daa0 SS |
1118 | /* |
1119 | * Caveat: Mutates scontext. | |
1120 | */ | |
12b29f34 SS |
1121 | static int string_to_context_struct(struct policydb *pol, |
1122 | struct sidtab *sidtabp, | |
9a59daa0 | 1123 | char *scontext, |
12b29f34 SS |
1124 | u32 scontext_len, |
1125 | struct context *ctx, | |
9a59daa0 | 1126 | u32 def_sid) |
12b29f34 | 1127 | { |
1da177e4 LT |
1128 | struct role_datum *role; |
1129 | struct type_datum *typdatum; | |
1130 | struct user_datum *usrdatum; | |
1131 | char *scontextp, *p, oldc; | |
1132 | int rc = 0; | |
1133 | ||
12b29f34 | 1134 | context_init(ctx); |
1da177e4 | 1135 | |
1da177e4 LT |
1136 | /* Parse the security context. */ |
1137 | ||
1138 | rc = -EINVAL; | |
9a59daa0 | 1139 | scontextp = (char *) scontext; |
1da177e4 LT |
1140 | |
1141 | /* Extract the user. */ | |
1142 | p = scontextp; | |
1143 | while (*p && *p != ':') | |
1144 | p++; | |
1145 | ||
1146 | if (*p == 0) | |
12b29f34 | 1147 | goto out; |
1da177e4 LT |
1148 | |
1149 | *p++ = 0; | |
1150 | ||
12b29f34 | 1151 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1152 | if (!usrdatum) |
12b29f34 | 1153 | goto out; |
1da177e4 | 1154 | |
12b29f34 | 1155 | ctx->user = usrdatum->value; |
1da177e4 LT |
1156 | |
1157 | /* Extract role. */ | |
1158 | scontextp = p; | |
1159 | while (*p && *p != ':') | |
1160 | p++; | |
1161 | ||
1162 | if (*p == 0) | |
12b29f34 | 1163 | goto out; |
1da177e4 LT |
1164 | |
1165 | *p++ = 0; | |
1166 | ||
12b29f34 | 1167 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1168 | if (!role) |
12b29f34 SS |
1169 | goto out; |
1170 | ctx->role = role->value; | |
1da177e4 LT |
1171 | |
1172 | /* Extract type. */ | |
1173 | scontextp = p; | |
1174 | while (*p && *p != ':') | |
1175 | p++; | |
1176 | oldc = *p; | |
1177 | *p++ = 0; | |
1178 | ||
12b29f34 | 1179 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1180 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1181 | goto out; |
1da177e4 | 1182 | |
12b29f34 | 1183 | ctx->type = typdatum->value; |
1da177e4 | 1184 | |
12b29f34 | 1185 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1186 | if (rc) |
12b29f34 | 1187 | goto out; |
1da177e4 | 1188 | |
9a59daa0 | 1189 | if ((p - scontext) < scontext_len) { |
1da177e4 | 1190 | rc = -EINVAL; |
12b29f34 | 1191 | goto out; |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | /* Check the validity of the new context. */ | |
12b29f34 | 1195 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 1196 | rc = -EINVAL; |
12b29f34 | 1197 | goto out; |
1da177e4 | 1198 | } |
12b29f34 SS |
1199 | rc = 0; |
1200 | out: | |
8e531af9 EP |
1201 | if (rc) |
1202 | context_destroy(ctx); | |
12b29f34 SS |
1203 | return rc; |
1204 | } | |
1205 | ||
1206 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1207 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1208 | int force) | |
1209 | { | |
9a59daa0 | 1210 | char *scontext2, *str = NULL; |
12b29f34 SS |
1211 | struct context context; |
1212 | int rc = 0; | |
1213 | ||
1214 | if (!ss_initialized) { | |
1215 | int i; | |
1216 | ||
1217 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1218 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1219 | *sid = i; | |
9a59daa0 | 1220 | return 0; |
12b29f34 SS |
1221 | } |
1222 | } | |
1223 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1224 | return 0; |
12b29f34 SS |
1225 | } |
1226 | *sid = SECSID_NULL; | |
1227 | ||
9a59daa0 | 1228 | /* Copy the string so that we can modify the copy as we parse it. */ |
c1a7368a | 1229 | scontext2 = kmalloc(scontext_len + 1, gfp_flags); |
9a59daa0 SS |
1230 | if (!scontext2) |
1231 | return -ENOMEM; | |
1232 | memcpy(scontext2, scontext, scontext_len); | |
1233 | scontext2[scontext_len] = 0; | |
1234 | ||
1235 | if (force) { | |
1236 | /* Save another copy for storing in uninterpreted form */ | |
1237 | str = kstrdup(scontext2, gfp_flags); | |
1238 | if (!str) { | |
1239 | kfree(scontext2); | |
1240 | return -ENOMEM; | |
1241 | } | |
1242 | } | |
1243 | ||
0804d113 | 1244 | read_lock(&policy_rwlock); |
12b29f34 | 1245 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1246 | scontext2, scontext_len, |
1247 | &context, def_sid); | |
12b29f34 | 1248 | if (rc == -EINVAL && force) { |
9a59daa0 | 1249 | context.str = str; |
12b29f34 | 1250 | context.len = scontext_len; |
9a59daa0 | 1251 | str = NULL; |
12b29f34 SS |
1252 | } else if (rc) |
1253 | goto out; | |
1254 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1255 | context_destroy(&context); |
1da177e4 | 1256 | out: |
0804d113 | 1257 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1258 | kfree(scontext2); |
1259 | kfree(str); | |
1da177e4 LT |
1260 | return rc; |
1261 | } | |
1262 | ||
f5c1d5b2 JM |
1263 | /** |
1264 | * security_context_to_sid - Obtain a SID for a given security context. | |
1265 | * @scontext: security context | |
1266 | * @scontext_len: length in bytes | |
1267 | * @sid: security identifier, SID | |
1268 | * | |
1269 | * Obtains a SID associated with the security context that | |
1270 | * has the string representation specified by @scontext. | |
1271 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1272 | * memory is available, or 0 on success. | |
1273 | */ | |
8f0cfa52 | 1274 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1275 | { |
1276 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1277 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1278 | } |
1279 | ||
1280 | /** | |
1281 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1282 | * falling back to specified default if needed. | |
1283 | * | |
1284 | * @scontext: security context | |
1285 | * @scontext_len: length in bytes | |
1286 | * @sid: security identifier, SID | |
d133a960 | 1287 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1288 | * |
1289 | * Obtains a SID associated with the security context that | |
1290 | * has the string representation specified by @scontext. | |
1291 | * The default SID is passed to the MLS layer to be used to allow | |
1292 | * kernel labeling of the MLS field if the MLS field is not present | |
1293 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1294 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1295 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1296 | * memory is available, or 0 on success. | |
1297 | */ | |
7bf570dc DH |
1298 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1299 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1300 | { |
1301 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1302 | sid, def_sid, gfp_flags, 1); |
1303 | } | |
1304 | ||
1305 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1306 | u32 *sid) | |
1307 | { | |
1308 | return security_context_to_sid_core(scontext, scontext_len, | |
1309 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1310 | } |
1311 | ||
1da177e4 LT |
1312 | static int compute_sid_handle_invalid_context( |
1313 | struct context *scontext, | |
1314 | struct context *tcontext, | |
1315 | u16 tclass, | |
1316 | struct context *newcontext) | |
1317 | { | |
1318 | char *s = NULL, *t = NULL, *n = NULL; | |
1319 | u32 slen, tlen, nlen; | |
1320 | ||
1321 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1322 | goto out; | |
1323 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1324 | goto out; | |
1325 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1326 | goto out; | |
9ad9ad38 | 1327 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1328 | "security_compute_sid: invalid context %s" |
1329 | " for scontext=%s" | |
1330 | " tcontext=%s" | |
1331 | " tclass=%s", | |
1332 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1333 | out: | |
1334 | kfree(s); | |
1335 | kfree(t); | |
1336 | kfree(n); | |
1337 | if (!selinux_enforcing) | |
1338 | return 0; | |
1339 | return -EACCES; | |
1340 | } | |
1341 | ||
1342 | static int security_compute_sid(u32 ssid, | |
1343 | u32 tsid, | |
c6d3aaa4 | 1344 | u16 orig_tclass, |
1da177e4 | 1345 | u32 specified, |
c6d3aaa4 SS |
1346 | u32 *out_sid, |
1347 | bool kern) | |
1da177e4 LT |
1348 | { |
1349 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1350 | struct role_trans *roletr = NULL; | |
1351 | struct avtab_key avkey; | |
1352 | struct avtab_datum *avdatum; | |
1353 | struct avtab_node *node; | |
c6d3aaa4 | 1354 | u16 tclass; |
1da177e4 LT |
1355 | int rc = 0; |
1356 | ||
1357 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1358 | switch (orig_tclass) { |
1359 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1360 | *out_sid = ssid; |
1361 | break; | |
1362 | default: | |
1363 | *out_sid = tsid; | |
1364 | break; | |
1365 | } | |
1366 | goto out; | |
1367 | } | |
1368 | ||
851f8a69 VY |
1369 | context_init(&newcontext); |
1370 | ||
0804d113 | 1371 | read_lock(&policy_rwlock); |
1da177e4 | 1372 | |
c6d3aaa4 SS |
1373 | if (kern) |
1374 | tclass = unmap_class(orig_tclass); | |
1375 | else | |
1376 | tclass = orig_tclass; | |
1377 | ||
1da177e4 LT |
1378 | scontext = sidtab_search(&sidtab, ssid); |
1379 | if (!scontext) { | |
744ba35e EP |
1380 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1381 | __func__, ssid); | |
1da177e4 LT |
1382 | rc = -EINVAL; |
1383 | goto out_unlock; | |
1384 | } | |
1385 | tcontext = sidtab_search(&sidtab, tsid); | |
1386 | if (!tcontext) { | |
744ba35e EP |
1387 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1388 | __func__, tsid); | |
1da177e4 LT |
1389 | rc = -EINVAL; |
1390 | goto out_unlock; | |
1391 | } | |
1392 | ||
1da177e4 LT |
1393 | /* Set the user identity. */ |
1394 | switch (specified) { | |
1395 | case AVTAB_TRANSITION: | |
1396 | case AVTAB_CHANGE: | |
1397 | /* Use the process user identity. */ | |
1398 | newcontext.user = scontext->user; | |
1399 | break; | |
1400 | case AVTAB_MEMBER: | |
1401 | /* Use the related object owner. */ | |
1402 | newcontext.user = tcontext->user; | |
1403 | break; | |
1404 | } | |
1405 | ||
1406 | /* Set the role and type to default values. */ | |
c6d3aaa4 | 1407 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1408 | /* Use the current role and type of process. */ |
1409 | newcontext.role = scontext->role; | |
1410 | newcontext.type = scontext->type; | |
c6d3aaa4 | 1411 | } else { |
1da177e4 LT |
1412 | /* Use the well-defined object role. */ |
1413 | newcontext.role = OBJECT_R_VAL; | |
1414 | /* Use the type of the related object. */ | |
1415 | newcontext.type = tcontext->type; | |
1416 | } | |
1417 | ||
1418 | /* Look for a type transition/member/change rule. */ | |
1419 | avkey.source_type = scontext->type; | |
1420 | avkey.target_type = tcontext->type; | |
1421 | avkey.target_class = tclass; | |
782ebb99 SS |
1422 | avkey.specified = specified; |
1423 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1424 | |
1425 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1426 | if (!avdatum) { |
782ebb99 | 1427 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1428 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1429 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1430 | avdatum = &node->datum; |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | } | |
1435 | ||
782ebb99 | 1436 | if (avdatum) { |
1da177e4 | 1437 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1438 | newcontext.type = avdatum->data; |
1da177e4 LT |
1439 | } |
1440 | ||
1441 | /* Check for class-specific changes. */ | |
c6d3aaa4 | 1442 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1443 | if (specified & AVTAB_TRANSITION) { |
1444 | /* Look for a role transition rule. */ | |
1445 | for (roletr = policydb.role_tr; roletr; | |
1446 | roletr = roletr->next) { | |
1447 | if (roletr->role == scontext->role && | |
1448 | roletr->type == tcontext->type) { | |
1449 | /* Use the role transition rule. */ | |
1450 | newcontext.role = roletr->new_role; | |
1451 | break; | |
1452 | } | |
1453 | } | |
1454 | } | |
1da177e4 LT |
1455 | } |
1456 | ||
1457 | /* Set the MLS attributes. | |
1458 | This is done last because it may allocate memory. */ | |
1459 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1460 | if (rc) | |
1461 | goto out_unlock; | |
1462 | ||
1463 | /* Check the validity of the context. */ | |
1464 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1465 | rc = compute_sid_handle_invalid_context(scontext, | |
1466 | tcontext, | |
1467 | tclass, | |
1468 | &newcontext); | |
1469 | if (rc) | |
1470 | goto out_unlock; | |
1471 | } | |
1472 | /* Obtain the sid for the context. */ | |
1473 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1474 | out_unlock: | |
0804d113 | 1475 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1476 | context_destroy(&newcontext); |
1477 | out: | |
1478 | return rc; | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * security_transition_sid - Compute the SID for a new subject/object. | |
1483 | * @ssid: source security identifier | |
1484 | * @tsid: target security identifier | |
1485 | * @tclass: target security class | |
1486 | * @out_sid: security identifier for new subject/object | |
1487 | * | |
1488 | * Compute a SID to use for labeling a new subject or object in the | |
1489 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1490 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1491 | * if insufficient memory is available, or %0 if the new SID was | |
1492 | * computed successfully. | |
1493 | */ | |
1494 | int security_transition_sid(u32 ssid, | |
1495 | u32 tsid, | |
1496 | u16 tclass, | |
1497 | u32 *out_sid) | |
1498 | { | |
c6d3aaa4 SS |
1499 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
1500 | out_sid, true); | |
1501 | } | |
1502 | ||
1503 | int security_transition_sid_user(u32 ssid, | |
1504 | u32 tsid, | |
1505 | u16 tclass, | |
1506 | u32 *out_sid) | |
1507 | { | |
1508 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
1509 | out_sid, false); | |
1da177e4 LT |
1510 | } |
1511 | ||
1512 | /** | |
1513 | * security_member_sid - Compute the SID for member selection. | |
1514 | * @ssid: source security identifier | |
1515 | * @tsid: target security identifier | |
1516 | * @tclass: target security class | |
1517 | * @out_sid: security identifier for selected member | |
1518 | * | |
1519 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1520 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1521 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1522 | * if insufficient memory is available, or %0 if the SID was | |
1523 | * computed successfully. | |
1524 | */ | |
1525 | int security_member_sid(u32 ssid, | |
1526 | u32 tsid, | |
1527 | u16 tclass, | |
1528 | u32 *out_sid) | |
1529 | { | |
c6d3aaa4 SS |
1530 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid, |
1531 | false); | |
1da177e4 LT |
1532 | } |
1533 | ||
1534 | /** | |
1535 | * security_change_sid - Compute the SID for object relabeling. | |
1536 | * @ssid: source security identifier | |
1537 | * @tsid: target security identifier | |
1538 | * @tclass: target security class | |
1539 | * @out_sid: security identifier for selected member | |
1540 | * | |
1541 | * Compute a SID to use for relabeling an object of class @tclass | |
1542 | * based on a SID pair (@ssid, @tsid). | |
1543 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1544 | * if insufficient memory is available, or %0 if the SID was | |
1545 | * computed successfully. | |
1546 | */ | |
1547 | int security_change_sid(u32 ssid, | |
1548 | u32 tsid, | |
1549 | u16 tclass, | |
1550 | u32 *out_sid) | |
1551 | { | |
c6d3aaa4 SS |
1552 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid, |
1553 | false); | |
b94c7e67 CS |
1554 | } |
1555 | ||
1da177e4 LT |
1556 | /* Clone the SID into the new SID table. */ |
1557 | static int clone_sid(u32 sid, | |
1558 | struct context *context, | |
1559 | void *arg) | |
1560 | { | |
1561 | struct sidtab *s = arg; | |
1562 | ||
42596eaf GT |
1563 | if (sid > SECINITSID_NUM) |
1564 | return sidtab_insert(s, sid, context); | |
1565 | else | |
1566 | return 0; | |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1570 | { | |
1571 | int rc = 0; | |
1572 | ||
1573 | if (selinux_enforcing) { | |
1574 | rc = -EINVAL; | |
1575 | } else { | |
1576 | char *s; | |
1577 | u32 len; | |
1578 | ||
12b29f34 SS |
1579 | if (!context_struct_to_string(context, &s, &len)) { |
1580 | printk(KERN_WARNING | |
1581 | "SELinux: Context %s would be invalid if enforcing\n", | |
1582 | s); | |
1583 | kfree(s); | |
1584 | } | |
1da177e4 LT |
1585 | } |
1586 | return rc; | |
1587 | } | |
1588 | ||
1589 | struct convert_context_args { | |
1590 | struct policydb *oldp; | |
1591 | struct policydb *newp; | |
1592 | }; | |
1593 | ||
1594 | /* | |
1595 | * Convert the values in the security context | |
1596 | * structure `c' from the values specified | |
1597 | * in the policy `p->oldp' to the values specified | |
1598 | * in the policy `p->newp'. Verify that the | |
1599 | * context is valid under the new policy. | |
1600 | */ | |
1601 | static int convert_context(u32 key, | |
1602 | struct context *c, | |
1603 | void *p) | |
1604 | { | |
1605 | struct convert_context_args *args; | |
1606 | struct context oldc; | |
0719aaf5 GT |
1607 | struct ocontext *oc; |
1608 | struct mls_range *range; | |
1da177e4 LT |
1609 | struct role_datum *role; |
1610 | struct type_datum *typdatum; | |
1611 | struct user_datum *usrdatum; | |
1612 | char *s; | |
1613 | u32 len; | |
42596eaf GT |
1614 | int rc = 0; |
1615 | ||
1616 | if (key <= SECINITSID_NUM) | |
1617 | goto out; | |
1da177e4 LT |
1618 | |
1619 | args = p; | |
1620 | ||
12b29f34 SS |
1621 | if (c->str) { |
1622 | struct context ctx; | |
9a59daa0 SS |
1623 | s = kstrdup(c->str, GFP_KERNEL); |
1624 | if (!s) { | |
1625 | rc = -ENOMEM; | |
1626 | goto out; | |
1627 | } | |
1628 | rc = string_to_context_struct(args->newp, NULL, s, | |
1629 | c->len, &ctx, SECSID_NULL); | |
1630 | kfree(s); | |
12b29f34 SS |
1631 | if (!rc) { |
1632 | printk(KERN_INFO | |
1633 | "SELinux: Context %s became valid (mapped).\n", | |
1634 | c->str); | |
1635 | /* Replace string with mapped representation. */ | |
1636 | kfree(c->str); | |
1637 | memcpy(c, &ctx, sizeof(*c)); | |
1638 | goto out; | |
1639 | } else if (rc == -EINVAL) { | |
1640 | /* Retain string representation for later mapping. */ | |
1641 | rc = 0; | |
1642 | goto out; | |
1643 | } else { | |
1644 | /* Other error condition, e.g. ENOMEM. */ | |
1645 | printk(KERN_ERR | |
1646 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1647 | c->str, -rc); | |
1648 | goto out; | |
1649 | } | |
1650 | } | |
1651 | ||
1da177e4 LT |
1652 | rc = context_cpy(&oldc, c); |
1653 | if (rc) | |
1654 | goto out; | |
1655 | ||
1656 | rc = -EINVAL; | |
1657 | ||
1658 | /* Convert the user. */ | |
1659 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1660 | args->oldp->p_user_val_to_name[c->user - 1]); |
1661 | if (!usrdatum) | |
1da177e4 | 1662 | goto bad; |
1da177e4 LT |
1663 | c->user = usrdatum->value; |
1664 | ||
1665 | /* Convert the role. */ | |
1666 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1667 | args->oldp->p_role_val_to_name[c->role - 1]); |
1668 | if (!role) | |
1da177e4 | 1669 | goto bad; |
1da177e4 LT |
1670 | c->role = role->value; |
1671 | ||
1672 | /* Convert the type. */ | |
1673 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1674 | args->oldp->p_type_val_to_name[c->type - 1]); |
1675 | if (!typdatum) | |
1da177e4 | 1676 | goto bad; |
1da177e4 LT |
1677 | c->type = typdatum->value; |
1678 | ||
0719aaf5 GT |
1679 | /* Convert the MLS fields if dealing with MLS policies */ |
1680 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1681 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1682 | if (rc) | |
1683 | goto bad; | |
1684 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1685 | /* | |
1686 | * Switching between MLS and non-MLS policy: | |
1687 | * free any storage used by the MLS fields in the | |
1688 | * context for all existing entries in the sidtab. | |
1689 | */ | |
1690 | mls_context_destroy(c); | |
1691 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1692 | /* | |
1693 | * Switching between non-MLS and MLS policy: | |
1694 | * ensure that the MLS fields of the context for all | |
1695 | * existing entries in the sidtab are filled in with a | |
1696 | * suitable default value, likely taken from one of the | |
1697 | * initial SIDs. | |
1698 | */ | |
1699 | oc = args->newp->ocontexts[OCON_ISID]; | |
1700 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1701 | oc = oc->next; | |
1702 | if (!oc) { | |
1703 | printk(KERN_ERR "SELinux: unable to look up" | |
1704 | " the initial SIDs list\n"); | |
1705 | goto bad; | |
1706 | } | |
1707 | range = &oc->context[0].range; | |
1708 | rc = mls_range_set(c, range); | |
1709 | if (rc) | |
1710 | goto bad; | |
1711 | } | |
1da177e4 LT |
1712 | |
1713 | /* Check the validity of the new context. */ | |
1714 | if (!policydb_context_isvalid(args->newp, c)) { | |
1715 | rc = convert_context_handle_invalid_context(&oldc); | |
1716 | if (rc) | |
1717 | goto bad; | |
1718 | } | |
1719 | ||
1720 | context_destroy(&oldc); | |
12b29f34 | 1721 | rc = 0; |
1da177e4 LT |
1722 | out: |
1723 | return rc; | |
1724 | bad: | |
12b29f34 SS |
1725 | /* Map old representation to string and save it. */ |
1726 | if (context_struct_to_string(&oldc, &s, &len)) | |
1727 | return -ENOMEM; | |
1da177e4 | 1728 | context_destroy(&oldc); |
12b29f34 SS |
1729 | context_destroy(c); |
1730 | c->str = s; | |
1731 | c->len = len; | |
1732 | printk(KERN_INFO | |
1733 | "SELinux: Context %s became invalid (unmapped).\n", | |
1734 | c->str); | |
1735 | rc = 0; | |
1da177e4 LT |
1736 | goto out; |
1737 | } | |
1738 | ||
3bb56b25 PM |
1739 | static void security_load_policycaps(void) |
1740 | { | |
1741 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1742 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1743 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1744 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1745 | } |
1746 | ||
1da177e4 | 1747 | extern void selinux_complete_init(void); |
e900a7d9 | 1748 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1749 | |
1750 | /** | |
1751 | * security_load_policy - Load a security policy configuration. | |
1752 | * @data: binary policy data | |
1753 | * @len: length of data in bytes | |
1754 | * | |
1755 | * Load a new set of security policy configuration data, | |
1756 | * validate it and convert the SID table as necessary. | |
1757 | * This function will flush the access vector cache after | |
1758 | * loading the new policy. | |
1759 | */ | |
1760 | int security_load_policy(void *data, size_t len) | |
1761 | { | |
1762 | struct policydb oldpolicydb, newpolicydb; | |
1763 | struct sidtab oldsidtab, newsidtab; | |
c6d3aaa4 | 1764 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
1765 | struct convert_context_args args; |
1766 | u32 seqno; | |
c6d3aaa4 | 1767 | u16 map_size; |
1da177e4 LT |
1768 | int rc = 0; |
1769 | struct policy_file file = { data, len }, *fp = &file; | |
1770 | ||
1da177e4 LT |
1771 | if (!ss_initialized) { |
1772 | avtab_cache_init(); | |
a2000050 EP |
1773 | rc = policydb_read(&policydb, fp); |
1774 | if (rc) { | |
1da177e4 | 1775 | avtab_cache_destroy(); |
a2000050 | 1776 | return rc; |
1da177e4 | 1777 | } |
a2000050 | 1778 | |
cee74f47 | 1779 | policydb.len = len; |
a2000050 EP |
1780 | rc = selinux_set_mapping(&policydb, secclass_map, |
1781 | ¤t_mapping, | |
1782 | ¤t_mapping_size); | |
1783 | if (rc) { | |
1da177e4 LT |
1784 | policydb_destroy(&policydb); |
1785 | avtab_cache_destroy(); | |
a2000050 | 1786 | return rc; |
1da177e4 | 1787 | } |
a2000050 EP |
1788 | |
1789 | rc = policydb_load_isids(&policydb, &sidtab); | |
1790 | if (rc) { | |
b94c7e67 CS |
1791 | policydb_destroy(&policydb); |
1792 | avtab_cache_destroy(); | |
a2000050 | 1793 | return rc; |
b94c7e67 | 1794 | } |
a2000050 | 1795 | |
3bb56b25 | 1796 | security_load_policycaps(); |
1da177e4 | 1797 | ss_initialized = 1; |
4c443d1b | 1798 | seqno = ++latest_granting; |
1da177e4 | 1799 | selinux_complete_init(); |
4c443d1b SS |
1800 | avc_ss_reset(seqno); |
1801 | selnl_notify_policyload(seqno); | |
11904167 | 1802 | selinux_status_update_policyload(seqno); |
7420ed23 | 1803 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1804 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1805 | return 0; |
1806 | } | |
1807 | ||
1808 | #if 0 | |
1809 | sidtab_hash_eval(&sidtab, "sids"); | |
1810 | #endif | |
1811 | ||
a2000050 EP |
1812 | rc = policydb_read(&newpolicydb, fp); |
1813 | if (rc) | |
1814 | return rc; | |
1da177e4 | 1815 | |
cee74f47 | 1816 | newpolicydb.len = len; |
0719aaf5 GT |
1817 | /* If switching between different policy types, log MLS status */ |
1818 | if (policydb.mls_enabled && !newpolicydb.mls_enabled) | |
1819 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); | |
1820 | else if (!policydb.mls_enabled && newpolicydb.mls_enabled) | |
1821 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); | |
1822 | ||
42596eaf GT |
1823 | rc = policydb_load_isids(&newpolicydb, &newsidtab); |
1824 | if (rc) { | |
1825 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
12b29f34 | 1826 | policydb_destroy(&newpolicydb); |
42596eaf | 1827 | return rc; |
12b29f34 | 1828 | } |
1da177e4 | 1829 | |
a2000050 EP |
1830 | rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size); |
1831 | if (rc) | |
b94c7e67 | 1832 | goto err; |
b94c7e67 | 1833 | |
e900a7d9 SS |
1834 | rc = security_preserve_bools(&newpolicydb); |
1835 | if (rc) { | |
454d972c | 1836 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1837 | goto err; |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | /* Clone the SID table. */ |
1841 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
1842 | |
1843 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
1844 | if (rc) | |
1da177e4 | 1845 | goto err; |
1da177e4 | 1846 | |
12b29f34 SS |
1847 | /* |
1848 | * Convert the internal representations of contexts | |
1849 | * in the new SID table. | |
1850 | */ | |
1da177e4 LT |
1851 | args.oldp = &policydb; |
1852 | args.newp = &newpolicydb; | |
12b29f34 | 1853 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
1854 | if (rc) { |
1855 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
1856 | " representation of contexts in the new SID" | |
1857 | " table\n"); | |
12b29f34 | 1858 | goto err; |
0719aaf5 | 1859 | } |
1da177e4 LT |
1860 | |
1861 | /* Save the old policydb and SID table to free later. */ | |
1862 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1863 | sidtab_set(&oldsidtab, &sidtab); | |
1864 | ||
1865 | /* Install the new policydb and SID table. */ | |
0804d113 | 1866 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1867 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1868 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1869 | security_load_policycaps(); |
c6d3aaa4 SS |
1870 | oldmap = current_mapping; |
1871 | current_mapping = map; | |
1872 | current_mapping_size = map_size; | |
1da177e4 | 1873 | seqno = ++latest_granting; |
0804d113 | 1874 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1875 | |
1876 | /* Free the old policydb and SID table. */ | |
1877 | policydb_destroy(&oldpolicydb); | |
1878 | sidtab_destroy(&oldsidtab); | |
c6d3aaa4 | 1879 | kfree(oldmap); |
1da177e4 LT |
1880 | |
1881 | avc_ss_reset(seqno); | |
1882 | selnl_notify_policyload(seqno); | |
11904167 | 1883 | selinux_status_update_policyload(seqno); |
7420ed23 | 1884 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1885 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1886 | |
1887 | return 0; | |
1888 | ||
1889 | err: | |
c6d3aaa4 | 1890 | kfree(map); |
1da177e4 LT |
1891 | sidtab_destroy(&newsidtab); |
1892 | policydb_destroy(&newpolicydb); | |
1893 | return rc; | |
1894 | ||
1895 | } | |
1896 | ||
cee74f47 EP |
1897 | size_t security_policydb_len(void) |
1898 | { | |
1899 | size_t len; | |
1900 | ||
1901 | read_lock(&policy_rwlock); | |
1902 | len = policydb.len; | |
1903 | read_unlock(&policy_rwlock); | |
1904 | ||
1905 | return len; | |
1906 | } | |
1907 | ||
1da177e4 LT |
1908 | /** |
1909 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1910 | * @protocol: protocol number |
1911 | * @port: port number | |
1912 | * @out_sid: security identifier | |
1913 | */ | |
3e112172 | 1914 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1915 | { |
1916 | struct ocontext *c; | |
1917 | int rc = 0; | |
1918 | ||
0804d113 | 1919 | read_lock(&policy_rwlock); |
1da177e4 LT |
1920 | |
1921 | c = policydb.ocontexts[OCON_PORT]; | |
1922 | while (c) { | |
1923 | if (c->u.port.protocol == protocol && | |
1924 | c->u.port.low_port <= port && | |
1925 | c->u.port.high_port >= port) | |
1926 | break; | |
1927 | c = c->next; | |
1928 | } | |
1929 | ||
1930 | if (c) { | |
1931 | if (!c->sid[0]) { | |
1932 | rc = sidtab_context_to_sid(&sidtab, | |
1933 | &c->context[0], | |
1934 | &c->sid[0]); | |
1935 | if (rc) | |
1936 | goto out; | |
1937 | } | |
1938 | *out_sid = c->sid[0]; | |
1939 | } else { | |
1940 | *out_sid = SECINITSID_PORT; | |
1941 | } | |
1942 | ||
1943 | out: | |
0804d113 | 1944 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1945 | return rc; |
1946 | } | |
1947 | ||
1948 | /** | |
1949 | * security_netif_sid - Obtain the SID for a network interface. | |
1950 | * @name: interface name | |
1951 | * @if_sid: interface SID | |
1da177e4 | 1952 | */ |
e8bfdb9d | 1953 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1954 | { |
1955 | int rc = 0; | |
1956 | struct ocontext *c; | |
1957 | ||
0804d113 | 1958 | read_lock(&policy_rwlock); |
1da177e4 LT |
1959 | |
1960 | c = policydb.ocontexts[OCON_NETIF]; | |
1961 | while (c) { | |
1962 | if (strcmp(name, c->u.name) == 0) | |
1963 | break; | |
1964 | c = c->next; | |
1965 | } | |
1966 | ||
1967 | if (c) { | |
1968 | if (!c->sid[0] || !c->sid[1]) { | |
1969 | rc = sidtab_context_to_sid(&sidtab, | |
1970 | &c->context[0], | |
1971 | &c->sid[0]); | |
1972 | if (rc) | |
1973 | goto out; | |
1974 | rc = sidtab_context_to_sid(&sidtab, | |
1975 | &c->context[1], | |
1976 | &c->sid[1]); | |
1977 | if (rc) | |
1978 | goto out; | |
1979 | } | |
1980 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1981 | } else |
1da177e4 | 1982 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1983 | |
1984 | out: | |
0804d113 | 1985 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1986 | return rc; |
1987 | } | |
1988 | ||
1989 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1990 | { | |
1991 | int i, fail = 0; | |
1992 | ||
5d55a345 EP |
1993 | for (i = 0; i < 4; i++) |
1994 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1995 | fail = 1; |
1996 | break; | |
1997 | } | |
1998 | ||
1999 | return !fail; | |
2000 | } | |
2001 | ||
2002 | /** | |
2003 | * security_node_sid - Obtain the SID for a node (host). | |
2004 | * @domain: communication domain aka address family | |
2005 | * @addrp: address | |
2006 | * @addrlen: address length in bytes | |
2007 | * @out_sid: security identifier | |
2008 | */ | |
2009 | int security_node_sid(u16 domain, | |
2010 | void *addrp, | |
2011 | u32 addrlen, | |
2012 | u32 *out_sid) | |
2013 | { | |
2014 | int rc = 0; | |
2015 | struct ocontext *c; | |
2016 | ||
0804d113 | 2017 | read_lock(&policy_rwlock); |
1da177e4 LT |
2018 | |
2019 | switch (domain) { | |
2020 | case AF_INET: { | |
2021 | u32 addr; | |
2022 | ||
2023 | if (addrlen != sizeof(u32)) { | |
2024 | rc = -EINVAL; | |
2025 | goto out; | |
2026 | } | |
2027 | ||
2028 | addr = *((u32 *)addrp); | |
2029 | ||
2030 | c = policydb.ocontexts[OCON_NODE]; | |
2031 | while (c) { | |
2032 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2033 | break; | |
2034 | c = c->next; | |
2035 | } | |
2036 | break; | |
2037 | } | |
2038 | ||
2039 | case AF_INET6: | |
2040 | if (addrlen != sizeof(u64) * 2) { | |
2041 | rc = -EINVAL; | |
2042 | goto out; | |
2043 | } | |
2044 | c = policydb.ocontexts[OCON_NODE6]; | |
2045 | while (c) { | |
2046 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2047 | c->u.node6.mask)) | |
2048 | break; | |
2049 | c = c->next; | |
2050 | } | |
2051 | break; | |
2052 | ||
2053 | default: | |
2054 | *out_sid = SECINITSID_NODE; | |
2055 | goto out; | |
2056 | } | |
2057 | ||
2058 | if (c) { | |
2059 | if (!c->sid[0]) { | |
2060 | rc = sidtab_context_to_sid(&sidtab, | |
2061 | &c->context[0], | |
2062 | &c->sid[0]); | |
2063 | if (rc) | |
2064 | goto out; | |
2065 | } | |
2066 | *out_sid = c->sid[0]; | |
2067 | } else { | |
2068 | *out_sid = SECINITSID_NODE; | |
2069 | } | |
2070 | ||
2071 | out: | |
0804d113 | 2072 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2073 | return rc; |
2074 | } | |
2075 | ||
2076 | #define SIDS_NEL 25 | |
2077 | ||
2078 | /** | |
2079 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2080 | * @fromsid: starting SID | |
2081 | * @username: username | |
2082 | * @sids: array of reachable SIDs for user | |
2083 | * @nel: number of elements in @sids | |
2084 | * | |
2085 | * Generate the set of SIDs for legal security contexts | |
2086 | * for a given user that can be reached by @fromsid. | |
2087 | * Set *@sids to point to a dynamically allocated | |
2088 | * array containing the set of SIDs. Set *@nel to the | |
2089 | * number of elements in the array. | |
2090 | */ | |
2091 | ||
2092 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2093 | char *username, |
1da177e4 LT |
2094 | u32 **sids, |
2095 | u32 *nel) | |
2096 | { | |
2097 | struct context *fromcon, usercon; | |
2c3c05db | 2098 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2099 | u32 mynel = 0, maxnel = SIDS_NEL; |
2100 | struct user_datum *user; | |
2101 | struct role_datum *role; | |
782ebb99 | 2102 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2103 | int rc = 0, i, j; |
2104 | ||
2c3c05db SS |
2105 | *sids = NULL; |
2106 | *nel = 0; | |
2107 | ||
2108 | if (!ss_initialized) | |
1da177e4 | 2109 | goto out; |
1da177e4 | 2110 | |
0804d113 | 2111 | read_lock(&policy_rwlock); |
1da177e4 | 2112 | |
12b29f34 SS |
2113 | context_init(&usercon); |
2114 | ||
1da177e4 LT |
2115 | fromcon = sidtab_search(&sidtab, fromsid); |
2116 | if (!fromcon) { | |
2117 | rc = -EINVAL; | |
2118 | goto out_unlock; | |
2119 | } | |
2120 | ||
2121 | user = hashtab_search(policydb.p_users.table, username); | |
2122 | if (!user) { | |
2123 | rc = -EINVAL; | |
2124 | goto out_unlock; | |
2125 | } | |
2126 | usercon.user = user->value; | |
2127 | ||
89d155ef | 2128 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
2129 | if (!mysids) { |
2130 | rc = -ENOMEM; | |
2131 | goto out_unlock; | |
2132 | } | |
1da177e4 | 2133 | |
9fe79ad1 | 2134 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2135 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2136 | usercon.role = i + 1; |
9fe79ad1 | 2137 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2138 | usercon.type = j + 1; |
1da177e4 LT |
2139 | |
2140 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2141 | continue; | |
2142 | ||
1da177e4 | 2143 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2144 | if (rc) |
1da177e4 | 2145 | goto out_unlock; |
1da177e4 LT |
2146 | if (mynel < maxnel) { |
2147 | mysids[mynel++] = sid; | |
2148 | } else { | |
2149 | maxnel += SIDS_NEL; | |
89d155ef | 2150 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
2151 | if (!mysids2) { |
2152 | rc = -ENOMEM; | |
1da177e4 LT |
2153 | goto out_unlock; |
2154 | } | |
1da177e4 LT |
2155 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2156 | kfree(mysids); | |
2157 | mysids = mysids2; | |
2158 | mysids[mynel++] = sid; | |
2159 | } | |
2160 | } | |
2161 | } | |
2162 | ||
1da177e4 | 2163 | out_unlock: |
0804d113 | 2164 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2165 | if (rc || !mynel) { |
2166 | kfree(mysids); | |
2167 | goto out; | |
2168 | } | |
2169 | ||
2170 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2171 | if (!mysids2) { | |
2172 | rc = -ENOMEM; | |
2173 | kfree(mysids); | |
2174 | goto out; | |
2175 | } | |
2176 | for (i = 0, j = 0; i < mynel; i++) { | |
2177 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
c6d3aaa4 | 2178 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db SS |
2179 | PROCESS__TRANSITION, AVC_STRICT, |
2180 | NULL); | |
2181 | if (!rc) | |
2182 | mysids2[j++] = mysids[i]; | |
2183 | cond_resched(); | |
2184 | } | |
2185 | rc = 0; | |
2186 | kfree(mysids); | |
2187 | *sids = mysids2; | |
2188 | *nel = j; | |
1da177e4 LT |
2189 | out: |
2190 | return rc; | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2195 | * @fstype: filesystem type | |
2196 | * @path: path from root of mount | |
2197 | * @sclass: file security class | |
2198 | * @sid: SID for path | |
2199 | * | |
2200 | * Obtain a SID to use for a file in a filesystem that | |
2201 | * cannot support xattr or use a fixed labeling behavior like | |
2202 | * transition SIDs or task SIDs. | |
2203 | */ | |
2204 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2205 | char *path, |
c6d3aaa4 | 2206 | u16 orig_sclass, |
1da177e4 LT |
2207 | u32 *sid) |
2208 | { | |
2209 | int len; | |
c6d3aaa4 | 2210 | u16 sclass; |
1da177e4 LT |
2211 | struct genfs *genfs; |
2212 | struct ocontext *c; | |
2213 | int rc = 0, cmp = 0; | |
2214 | ||
b1aa5301 SS |
2215 | while (path[0] == '/' && path[1] == '/') |
2216 | path++; | |
2217 | ||
0804d113 | 2218 | read_lock(&policy_rwlock); |
1da177e4 | 2219 | |
c6d3aaa4 SS |
2220 | sclass = unmap_class(orig_sclass); |
2221 | ||
1da177e4 LT |
2222 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2223 | cmp = strcmp(fstype, genfs->fstype); | |
2224 | if (cmp <= 0) | |
2225 | break; | |
2226 | } | |
2227 | ||
2228 | if (!genfs || cmp) { | |
2229 | *sid = SECINITSID_UNLABELED; | |
2230 | rc = -ENOENT; | |
2231 | goto out; | |
2232 | } | |
2233 | ||
2234 | for (c = genfs->head; c; c = c->next) { | |
2235 | len = strlen(c->u.name); | |
2236 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2237 | (strncmp(c->u.name, path, len) == 0)) | |
2238 | break; | |
2239 | } | |
2240 | ||
2241 | if (!c) { | |
2242 | *sid = SECINITSID_UNLABELED; | |
2243 | rc = -ENOENT; | |
2244 | goto out; | |
2245 | } | |
2246 | ||
2247 | if (!c->sid[0]) { | |
2248 | rc = sidtab_context_to_sid(&sidtab, | |
2249 | &c->context[0], | |
2250 | &c->sid[0]); | |
2251 | if (rc) | |
2252 | goto out; | |
2253 | } | |
2254 | ||
2255 | *sid = c->sid[0]; | |
2256 | out: | |
0804d113 | 2257 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2258 | return rc; |
2259 | } | |
2260 | ||
2261 | /** | |
2262 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2263 | * @fstype: filesystem type | |
2264 | * @behavior: labeling behavior | |
2265 | * @sid: SID for filesystem (superblock) | |
2266 | */ | |
2267 | int security_fs_use( | |
2268 | const char *fstype, | |
2269 | unsigned int *behavior, | |
089be43e | 2270 | u32 *sid) |
1da177e4 LT |
2271 | { |
2272 | int rc = 0; | |
2273 | struct ocontext *c; | |
2274 | ||
0804d113 | 2275 | read_lock(&policy_rwlock); |
1da177e4 LT |
2276 | |
2277 | c = policydb.ocontexts[OCON_FSUSE]; | |
2278 | while (c) { | |
2279 | if (strcmp(fstype, c->u.name) == 0) | |
2280 | break; | |
2281 | c = c->next; | |
2282 | } | |
2283 | ||
2284 | if (c) { | |
2285 | *behavior = c->v.behavior; | |
2286 | if (!c->sid[0]) { | |
2287 | rc = sidtab_context_to_sid(&sidtab, | |
2288 | &c->context[0], | |
2289 | &c->sid[0]); | |
2290 | if (rc) | |
2291 | goto out; | |
2292 | } | |
2293 | *sid = c->sid[0]; | |
2294 | } else { | |
089be43e JM |
2295 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2296 | if (rc) { | |
2297 | *behavior = SECURITY_FS_USE_NONE; | |
2298 | rc = 0; | |
2299 | } else { | |
2300 | *behavior = SECURITY_FS_USE_GENFS; | |
2301 | } | |
1da177e4 LT |
2302 | } |
2303 | ||
2304 | out: | |
0804d113 | 2305 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2306 | return rc; |
2307 | } | |
2308 | ||
2309 | int security_get_bools(int *len, char ***names, int **values) | |
2310 | { | |
2311 | int i, rc = -ENOMEM; | |
2312 | ||
0804d113 | 2313 | read_lock(&policy_rwlock); |
1da177e4 LT |
2314 | *names = NULL; |
2315 | *values = NULL; | |
2316 | ||
2317 | *len = policydb.p_bools.nprim; | |
2318 | if (!*len) { | |
2319 | rc = 0; | |
2320 | goto out; | |
2321 | } | |
2322 | ||
5d55a345 | 2323 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2324 | if (!*names) |
2325 | goto err; | |
1da177e4 | 2326 | |
e0795cf4 | 2327 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2328 | if (!*values) |
2329 | goto err; | |
2330 | ||
2331 | for (i = 0; i < *len; i++) { | |
2332 | size_t name_len; | |
2333 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2334 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2335 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2336 | if (!(*names)[i]) |
2337 | goto err; | |
2338 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2339 | (*names)[i][name_len - 1] = 0; | |
2340 | } | |
2341 | rc = 0; | |
2342 | out: | |
0804d113 | 2343 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2344 | return rc; |
2345 | err: | |
2346 | if (*names) { | |
2347 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2348 | kfree((*names)[i]); |
1da177e4 | 2349 | } |
9a5f04bf | 2350 | kfree(*values); |
1da177e4 LT |
2351 | goto out; |
2352 | } | |
2353 | ||
2354 | ||
2355 | int security_set_bools(int len, int *values) | |
2356 | { | |
2357 | int i, rc = 0; | |
2358 | int lenp, seqno = 0; | |
2359 | struct cond_node *cur; | |
2360 | ||
0804d113 | 2361 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2362 | |
2363 | lenp = policydb.p_bools.nprim; | |
2364 | if (len != lenp) { | |
2365 | rc = -EFAULT; | |
2366 | goto out; | |
2367 | } | |
2368 | ||
1da177e4 | 2369 | for (i = 0; i < len; i++) { |
af601e46 SG |
2370 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2371 | audit_log(current->audit_context, GFP_ATOMIC, | |
2372 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2373 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2374 | policydb.p_bool_val_to_name[i], |
2375 | !!values[i], | |
2376 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2377 | audit_get_loginuid(current), |
2378 | audit_get_sessionid(current)); | |
af601e46 | 2379 | } |
5d55a345 | 2380 | if (values[i]) |
1da177e4 | 2381 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2382 | else |
1da177e4 | 2383 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2384 | } |
1da177e4 | 2385 | |
dbc74c65 | 2386 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2387 | rc = evaluate_cond_node(&policydb, cur); |
2388 | if (rc) | |
2389 | goto out; | |
2390 | } | |
2391 | ||
2392 | seqno = ++latest_granting; | |
2393 | ||
2394 | out: | |
0804d113 | 2395 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2396 | if (!rc) { |
2397 | avc_ss_reset(seqno); | |
2398 | selnl_notify_policyload(seqno); | |
11904167 | 2399 | selinux_status_update_policyload(seqno); |
342a0cff | 2400 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2401 | } |
2402 | return rc; | |
2403 | } | |
2404 | ||
2405 | int security_get_bool_value(int bool) | |
2406 | { | |
2407 | int rc = 0; | |
2408 | int len; | |
2409 | ||
0804d113 | 2410 | read_lock(&policy_rwlock); |
1da177e4 LT |
2411 | |
2412 | len = policydb.p_bools.nprim; | |
2413 | if (bool >= len) { | |
2414 | rc = -EFAULT; | |
2415 | goto out; | |
2416 | } | |
2417 | ||
2418 | rc = policydb.bool_val_to_struct[bool]->state; | |
2419 | out: | |
0804d113 | 2420 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2421 | return rc; |
2422 | } | |
376bd9cb | 2423 | |
e900a7d9 SS |
2424 | static int security_preserve_bools(struct policydb *p) |
2425 | { | |
2426 | int rc, nbools = 0, *bvalues = NULL, i; | |
2427 | char **bnames = NULL; | |
2428 | struct cond_bool_datum *booldatum; | |
2429 | struct cond_node *cur; | |
2430 | ||
2431 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2432 | if (rc) | |
2433 | goto out; | |
2434 | for (i = 0; i < nbools; i++) { | |
2435 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2436 | if (booldatum) | |
2437 | booldatum->state = bvalues[i]; | |
2438 | } | |
dbc74c65 | 2439 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2440 | rc = evaluate_cond_node(p, cur); |
2441 | if (rc) | |
2442 | goto out; | |
2443 | } | |
2444 | ||
2445 | out: | |
2446 | if (bnames) { | |
2447 | for (i = 0; i < nbools; i++) | |
2448 | kfree(bnames[i]); | |
2449 | } | |
2450 | kfree(bnames); | |
2451 | kfree(bvalues); | |
2452 | return rc; | |
2453 | } | |
2454 | ||
08554d6b VY |
2455 | /* |
2456 | * security_sid_mls_copy() - computes a new sid based on the given | |
2457 | * sid and the mls portion of mls_sid. | |
2458 | */ | |
2459 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2460 | { | |
2461 | struct context *context1; | |
2462 | struct context *context2; | |
2463 | struct context newcon; | |
2464 | char *s; | |
2465 | u32 len; | |
2466 | int rc = 0; | |
2467 | ||
0719aaf5 | 2468 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2469 | *new_sid = sid; |
2470 | goto out; | |
2471 | } | |
2472 | ||
2473 | context_init(&newcon); | |
2474 | ||
0804d113 | 2475 | read_lock(&policy_rwlock); |
08554d6b VY |
2476 | context1 = sidtab_search(&sidtab, sid); |
2477 | if (!context1) { | |
744ba35e EP |
2478 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2479 | __func__, sid); | |
08554d6b VY |
2480 | rc = -EINVAL; |
2481 | goto out_unlock; | |
2482 | } | |
2483 | ||
2484 | context2 = sidtab_search(&sidtab, mls_sid); | |
2485 | if (!context2) { | |
744ba35e EP |
2486 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2487 | __func__, mls_sid); | |
08554d6b VY |
2488 | rc = -EINVAL; |
2489 | goto out_unlock; | |
2490 | } | |
2491 | ||
2492 | newcon.user = context1->user; | |
2493 | newcon.role = context1->role; | |
2494 | newcon.type = context1->type; | |
0efc61ea | 2495 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2496 | if (rc) |
2497 | goto out_unlock; | |
2498 | ||
08554d6b VY |
2499 | /* Check the validity of the new context. */ |
2500 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2501 | rc = convert_context_handle_invalid_context(&newcon); | |
2502 | if (rc) | |
2503 | goto bad; | |
2504 | } | |
2505 | ||
2506 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2507 | goto out_unlock; | |
2508 | ||
2509 | bad: | |
2510 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2511 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2512 | "security_sid_mls_copy: invalid context %s", s); | |
2513 | kfree(s); | |
2514 | } | |
2515 | ||
2516 | out_unlock: | |
0804d113 | 2517 | read_unlock(&policy_rwlock); |
08554d6b VY |
2518 | context_destroy(&newcon); |
2519 | out: | |
2520 | return rc; | |
2521 | } | |
2522 | ||
220deb96 PM |
2523 | /** |
2524 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2525 | * @nlbl_sid: NetLabel SID | |
2526 | * @nlbl_type: NetLabel labeling protocol type | |
2527 | * @xfrm_sid: XFRM SID | |
2528 | * | |
2529 | * Description: | |
2530 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2531 | * resolved into a single SID it is returned via @peer_sid and the function | |
2532 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2533 | * returns a negative value. A table summarizing the behavior is below: | |
2534 | * | |
2535 | * | function return | @sid | |
2536 | * ------------------------------+-----------------+----------------- | |
2537 | * no peer labels | 0 | SECSID_NULL | |
2538 | * single peer label | 0 | <peer_label> | |
2539 | * multiple, consistent labels | 0 | <peer_label> | |
2540 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2541 | * | |
2542 | */ | |
2543 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2544 | u32 xfrm_sid, | |
2545 | u32 *peer_sid) | |
2546 | { | |
2547 | int rc; | |
2548 | struct context *nlbl_ctx; | |
2549 | struct context *xfrm_ctx; | |
2550 | ||
2551 | /* handle the common (which also happens to be the set of easy) cases | |
2552 | * right away, these two if statements catch everything involving a | |
2553 | * single or absent peer SID/label */ | |
2554 | if (xfrm_sid == SECSID_NULL) { | |
2555 | *peer_sid = nlbl_sid; | |
2556 | return 0; | |
2557 | } | |
2558 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2559 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2560 | * is present */ | |
2561 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2562 | *peer_sid = xfrm_sid; | |
2563 | return 0; | |
2564 | } | |
2565 | ||
2566 | /* we don't need to check ss_initialized here since the only way both | |
2567 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2568 | * security server was initialized and ss_initialized was true */ | |
0719aaf5 | 2569 | if (!policydb.mls_enabled) { |
220deb96 PM |
2570 | *peer_sid = SECSID_NULL; |
2571 | return 0; | |
2572 | } | |
2573 | ||
0804d113 | 2574 | read_lock(&policy_rwlock); |
220deb96 PM |
2575 | |
2576 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2577 | if (!nlbl_ctx) { | |
744ba35e EP |
2578 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2579 | __func__, nlbl_sid); | |
220deb96 PM |
2580 | rc = -EINVAL; |
2581 | goto out_slowpath; | |
2582 | } | |
2583 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2584 | if (!xfrm_ctx) { | |
744ba35e EP |
2585 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2586 | __func__, xfrm_sid); | |
220deb96 PM |
2587 | rc = -EINVAL; |
2588 | goto out_slowpath; | |
2589 | } | |
2590 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2591 | ||
2592 | out_slowpath: | |
0804d113 | 2593 | read_unlock(&policy_rwlock); |
220deb96 PM |
2594 | if (rc == 0) |
2595 | /* at present NetLabel SIDs/labels really only carry MLS | |
2596 | * information so if the MLS portion of the NetLabel SID | |
2597 | * matches the MLS portion of the labeled XFRM SID/label | |
2598 | * then pass along the XFRM SID as it is the most | |
2599 | * expressive */ | |
2600 | *peer_sid = xfrm_sid; | |
2601 | else | |
2602 | *peer_sid = SECSID_NULL; | |
2603 | return rc; | |
2604 | } | |
2605 | ||
55fcf09b CP |
2606 | static int get_classes_callback(void *k, void *d, void *args) |
2607 | { | |
2608 | struct class_datum *datum = d; | |
2609 | char *name = k, **classes = args; | |
2610 | int value = datum->value - 1; | |
2611 | ||
2612 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2613 | if (!classes[value]) | |
2614 | return -ENOMEM; | |
2615 | ||
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | int security_get_classes(char ***classes, int *nclasses) | |
2620 | { | |
2621 | int rc = -ENOMEM; | |
2622 | ||
0804d113 | 2623 | read_lock(&policy_rwlock); |
55fcf09b CP |
2624 | |
2625 | *nclasses = policydb.p_classes.nprim; | |
9f59f90b | 2626 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
2627 | if (!*classes) |
2628 | goto out; | |
2629 | ||
2630 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2631 | *classes); | |
2632 | if (rc < 0) { | |
2633 | int i; | |
2634 | for (i = 0; i < *nclasses; i++) | |
2635 | kfree((*classes)[i]); | |
2636 | kfree(*classes); | |
2637 | } | |
2638 | ||
2639 | out: | |
0804d113 | 2640 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2641 | return rc; |
2642 | } | |
2643 | ||
2644 | static int get_permissions_callback(void *k, void *d, void *args) | |
2645 | { | |
2646 | struct perm_datum *datum = d; | |
2647 | char *name = k, **perms = args; | |
2648 | int value = datum->value - 1; | |
2649 | ||
2650 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2651 | if (!perms[value]) | |
2652 | return -ENOMEM; | |
2653 | ||
2654 | return 0; | |
2655 | } | |
2656 | ||
2657 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2658 | { | |
2659 | int rc = -ENOMEM, i; | |
2660 | struct class_datum *match; | |
2661 | ||
0804d113 | 2662 | read_lock(&policy_rwlock); |
55fcf09b CP |
2663 | |
2664 | match = hashtab_search(policydb.p_classes.table, class); | |
2665 | if (!match) { | |
744ba35e | 2666 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2667 | __func__, class); |
55fcf09b CP |
2668 | rc = -EINVAL; |
2669 | goto out; | |
2670 | } | |
2671 | ||
2672 | *nperms = match->permissions.nprim; | |
9f59f90b | 2673 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
2674 | if (!*perms) |
2675 | goto out; | |
2676 | ||
2677 | if (match->comdatum) { | |
2678 | rc = hashtab_map(match->comdatum->permissions.table, | |
2679 | get_permissions_callback, *perms); | |
2680 | if (rc < 0) | |
2681 | goto err; | |
2682 | } | |
2683 | ||
2684 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2685 | *perms); | |
2686 | if (rc < 0) | |
2687 | goto err; | |
2688 | ||
2689 | out: | |
0804d113 | 2690 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2691 | return rc; |
2692 | ||
2693 | err: | |
0804d113 | 2694 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2695 | for (i = 0; i < *nperms; i++) |
2696 | kfree((*perms)[i]); | |
2697 | kfree(*perms); | |
2698 | return rc; | |
2699 | } | |
2700 | ||
3f12070e EP |
2701 | int security_get_reject_unknown(void) |
2702 | { | |
2703 | return policydb.reject_unknown; | |
2704 | } | |
2705 | ||
2706 | int security_get_allow_unknown(void) | |
2707 | { | |
2708 | return policydb.allow_unknown; | |
2709 | } | |
2710 | ||
3bb56b25 PM |
2711 | /** |
2712 | * security_policycap_supported - Check for a specific policy capability | |
2713 | * @req_cap: capability | |
2714 | * | |
2715 | * Description: | |
2716 | * This function queries the currently loaded policy to see if it supports the | |
2717 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2718 | * supported, false (0) if it isn't supported. | |
2719 | * | |
2720 | */ | |
2721 | int security_policycap_supported(unsigned int req_cap) | |
2722 | { | |
2723 | int rc; | |
2724 | ||
0804d113 | 2725 | read_lock(&policy_rwlock); |
3bb56b25 | 2726 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2727 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2728 | |
2729 | return rc; | |
2730 | } | |
2731 | ||
376bd9cb DG |
2732 | struct selinux_audit_rule { |
2733 | u32 au_seqno; | |
2734 | struct context au_ctxt; | |
2735 | }; | |
2736 | ||
9d57a7f9 | 2737 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2738 | { |
9d57a7f9 AD |
2739 | struct selinux_audit_rule *rule = vrule; |
2740 | ||
376bd9cb DG |
2741 | if (rule) { |
2742 | context_destroy(&rule->au_ctxt); | |
2743 | kfree(rule); | |
2744 | } | |
2745 | } | |
2746 | ||
9d57a7f9 | 2747 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2748 | { |
2749 | struct selinux_audit_rule *tmprule; | |
2750 | struct role_datum *roledatum; | |
2751 | struct type_datum *typedatum; | |
2752 | struct user_datum *userdatum; | |
9d57a7f9 | 2753 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2754 | int rc = 0; |
2755 | ||
2756 | *rule = NULL; | |
2757 | ||
2758 | if (!ss_initialized) | |
3ad40d64 | 2759 | return -EOPNOTSUPP; |
376bd9cb DG |
2760 | |
2761 | switch (field) { | |
3a6b9f85 DG |
2762 | case AUDIT_SUBJ_USER: |
2763 | case AUDIT_SUBJ_ROLE: | |
2764 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2765 | case AUDIT_OBJ_USER: |
2766 | case AUDIT_OBJ_ROLE: | |
2767 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2768 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2769 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2770 | return -EINVAL; |
2771 | break; | |
3a6b9f85 DG |
2772 | case AUDIT_SUBJ_SEN: |
2773 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2774 | case AUDIT_OBJ_LEV_LOW: |
2775 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2776 | /* we do not allow a range, indicated by the presense of '-' */ |
2777 | if (strchr(rulestr, '-')) | |
2778 | return -EINVAL; | |
2779 | break; | |
2780 | default: | |
2781 | /* only the above fields are valid */ | |
2782 | return -EINVAL; | |
2783 | } | |
2784 | ||
2785 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2786 | if (!tmprule) | |
2787 | return -ENOMEM; | |
2788 | ||
2789 | context_init(&tmprule->au_ctxt); | |
2790 | ||
0804d113 | 2791 | read_lock(&policy_rwlock); |
376bd9cb DG |
2792 | |
2793 | tmprule->au_seqno = latest_granting; | |
2794 | ||
2795 | switch (field) { | |
3a6b9f85 | 2796 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2797 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2798 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2799 | if (!userdatum) | |
2800 | rc = -EINVAL; | |
2801 | else | |
2802 | tmprule->au_ctxt.user = userdatum->value; | |
2803 | break; | |
3a6b9f85 | 2804 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2805 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2806 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2807 | if (!roledatum) | |
2808 | rc = -EINVAL; | |
2809 | else | |
2810 | tmprule->au_ctxt.role = roledatum->value; | |
2811 | break; | |
3a6b9f85 | 2812 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2813 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2814 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2815 | if (!typedatum) | |
2816 | rc = -EINVAL; | |
2817 | else | |
2818 | tmprule->au_ctxt.type = typedatum->value; | |
2819 | break; | |
3a6b9f85 DG |
2820 | case AUDIT_SUBJ_SEN: |
2821 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2822 | case AUDIT_OBJ_LEV_LOW: |
2823 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2824 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2825 | break; | |
2826 | } | |
2827 | ||
0804d113 | 2828 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2829 | |
2830 | if (rc) { | |
2831 | selinux_audit_rule_free(tmprule); | |
2832 | tmprule = NULL; | |
2833 | } | |
2834 | ||
2835 | *rule = tmprule; | |
2836 | ||
2837 | return rc; | |
2838 | } | |
2839 | ||
9d57a7f9 AD |
2840 | /* Check to see if the rule contains any selinux fields */ |
2841 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2842 | { | |
2843 | int i; | |
2844 | ||
2845 | for (i = 0; i < rule->field_count; i++) { | |
2846 | struct audit_field *f = &rule->fields[i]; | |
2847 | switch (f->type) { | |
2848 | case AUDIT_SUBJ_USER: | |
2849 | case AUDIT_SUBJ_ROLE: | |
2850 | case AUDIT_SUBJ_TYPE: | |
2851 | case AUDIT_SUBJ_SEN: | |
2852 | case AUDIT_SUBJ_CLR: | |
2853 | case AUDIT_OBJ_USER: | |
2854 | case AUDIT_OBJ_ROLE: | |
2855 | case AUDIT_OBJ_TYPE: | |
2856 | case AUDIT_OBJ_LEV_LOW: | |
2857 | case AUDIT_OBJ_LEV_HIGH: | |
2858 | return 1; | |
2859 | } | |
2860 | } | |
2861 | ||
2862 | return 0; | |
2863 | } | |
2864 | ||
2865 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2866 | struct audit_context *actx) |
376bd9cb DG |
2867 | { |
2868 | struct context *ctxt; | |
2869 | struct mls_level *level; | |
9d57a7f9 | 2870 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2871 | int match = 0; |
2872 | ||
2873 | if (!rule) { | |
2874 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2875 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2876 | return -ENOENT; |
2877 | } | |
2878 | ||
0804d113 | 2879 | read_lock(&policy_rwlock); |
376bd9cb DG |
2880 | |
2881 | if (rule->au_seqno < latest_granting) { | |
2882 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2883 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2884 | match = -ESTALE; |
2885 | goto out; | |
2886 | } | |
2887 | ||
9a2f44f0 | 2888 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2889 | if (!ctxt) { |
2890 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2891 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2892 | sid); | |
376bd9cb DG |
2893 | match = -ENOENT; |
2894 | goto out; | |
2895 | } | |
2896 | ||
2897 | /* a field/op pair that is not caught here will simply fall through | |
2898 | without a match */ | |
2899 | switch (field) { | |
3a6b9f85 | 2900 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2901 | case AUDIT_OBJ_USER: |
376bd9cb | 2902 | switch (op) { |
5af75d8d | 2903 | case Audit_equal: |
376bd9cb DG |
2904 | match = (ctxt->user == rule->au_ctxt.user); |
2905 | break; | |
5af75d8d | 2906 | case Audit_not_equal: |
376bd9cb DG |
2907 | match = (ctxt->user != rule->au_ctxt.user); |
2908 | break; | |
2909 | } | |
2910 | break; | |
3a6b9f85 | 2911 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2912 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2913 | switch (op) { |
5af75d8d | 2914 | case Audit_equal: |
376bd9cb DG |
2915 | match = (ctxt->role == rule->au_ctxt.role); |
2916 | break; | |
5af75d8d | 2917 | case Audit_not_equal: |
376bd9cb DG |
2918 | match = (ctxt->role != rule->au_ctxt.role); |
2919 | break; | |
2920 | } | |
2921 | break; | |
3a6b9f85 | 2922 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2923 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2924 | switch (op) { |
5af75d8d | 2925 | case Audit_equal: |
376bd9cb DG |
2926 | match = (ctxt->type == rule->au_ctxt.type); |
2927 | break; | |
5af75d8d | 2928 | case Audit_not_equal: |
376bd9cb DG |
2929 | match = (ctxt->type != rule->au_ctxt.type); |
2930 | break; | |
2931 | } | |
2932 | break; | |
3a6b9f85 DG |
2933 | case AUDIT_SUBJ_SEN: |
2934 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2935 | case AUDIT_OBJ_LEV_LOW: |
2936 | case AUDIT_OBJ_LEV_HIGH: | |
2937 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2938 | field == AUDIT_OBJ_LEV_LOW) ? |
2939 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2940 | switch (op) { |
5af75d8d | 2941 | case Audit_equal: |
376bd9cb | 2942 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2943 | level); |
376bd9cb | 2944 | break; |
5af75d8d | 2945 | case Audit_not_equal: |
376bd9cb | 2946 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2947 | level); |
376bd9cb | 2948 | break; |
5af75d8d | 2949 | case Audit_lt: |
376bd9cb | 2950 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2951 | level) && |
2952 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2953 | level)); | |
376bd9cb | 2954 | break; |
5af75d8d | 2955 | case Audit_le: |
376bd9cb | 2956 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2957 | level); |
376bd9cb | 2958 | break; |
5af75d8d | 2959 | case Audit_gt: |
376bd9cb | 2960 | match = (mls_level_dom(level, |
5d55a345 EP |
2961 | &rule->au_ctxt.range.level[0]) && |
2962 | !mls_level_eq(level, | |
2963 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2964 | break; |
5af75d8d | 2965 | case Audit_ge: |
376bd9cb | 2966 | match = mls_level_dom(level, |
5d55a345 | 2967 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2968 | break; |
2969 | } | |
2970 | } | |
2971 | ||
2972 | out: | |
0804d113 | 2973 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2974 | return match; |
2975 | } | |
2976 | ||
9d57a7f9 | 2977 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2978 | |
2979 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2980 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2981 | { |
2982 | int err = 0; | |
2983 | ||
2984 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2985 | err = aurule_callback(); | |
2986 | return err; | |
2987 | } | |
2988 | ||
2989 | static int __init aurule_init(void) | |
2990 | { | |
2991 | int err; | |
2992 | ||
2993 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2994 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2995 | if (err) |
2996 | panic("avc_add_callback() failed, error %d\n", err); | |
2997 | ||
2998 | return err; | |
2999 | } | |
3000 | __initcall(aurule_init); | |
3001 | ||
7420ed23 | 3002 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3003 | /** |
5778eabd PM |
3004 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3005 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3006 | * @sid: the SELinux SID |
7420ed23 VY |
3007 | * |
3008 | * Description: | |
3009 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3010 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3011 | * already been initialized. | |
7420ed23 VY |
3012 | * |
3013 | */ | |
5778eabd | 3014 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3015 | u32 sid) |
7420ed23 | 3016 | { |
5dbe1eb0 | 3017 | u32 *sid_cache; |
7420ed23 | 3018 | |
5dbe1eb0 PM |
3019 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3020 | if (sid_cache == NULL) | |
5778eabd | 3021 | return; |
5dbe1eb0 PM |
3022 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3023 | if (secattr->cache == NULL) { | |
3024 | kfree(sid_cache); | |
5778eabd | 3025 | return; |
0ec8abd7 | 3026 | } |
7420ed23 | 3027 | |
5dbe1eb0 PM |
3028 | *sid_cache = sid; |
3029 | secattr->cache->free = kfree; | |
3030 | secattr->cache->data = sid_cache; | |
5778eabd | 3031 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3032 | } |
3033 | ||
3034 | /** | |
5778eabd | 3035 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3036 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3037 | * @sid: the SELinux SID |
3038 | * | |
3039 | * Description: | |
5778eabd | 3040 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3041 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
3042 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
3043 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
3044 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3045 | * conversion for future lookups. Returns zero on success, negative values on | |
3046 | * failure. | |
7420ed23 VY |
3047 | * |
3048 | */ | |
5778eabd | 3049 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3050 | u32 *sid) |
7420ed23 VY |
3051 | { |
3052 | int rc = -EIDRM; | |
3053 | struct context *ctx; | |
3054 | struct context ctx_new; | |
5778eabd PM |
3055 | |
3056 | if (!ss_initialized) { | |
3057 | *sid = SECSID_NULL; | |
3058 | return 0; | |
3059 | } | |
7420ed23 | 3060 | |
0804d113 | 3061 | read_lock(&policy_rwlock); |
7420ed23 | 3062 | |
701a90ba | 3063 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
3064 | *sid = *(u32 *)secattr->cache->data; |
3065 | rc = 0; | |
16efd454 PM |
3066 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
3067 | *sid = secattr->attr.secid; | |
3068 | rc = 0; | |
701a90ba | 3069 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 3070 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
3071 | if (ctx == NULL) |
3072 | goto netlbl_secattr_to_sid_return; | |
3073 | ||
81990fbd | 3074 | context_init(&ctx_new); |
7420ed23 VY |
3075 | ctx_new.user = ctx->user; |
3076 | ctx_new.role = ctx->role; | |
3077 | ctx_new.type = ctx->type; | |
02752760 | 3078 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3079 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 3080 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 3081 | secattr->attr.mls.cat) != 0) |
7420ed23 | 3082 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
3083 | memcpy(&ctx_new.range.level[1].cat, |
3084 | &ctx_new.range.level[0].cat, | |
3085 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
3086 | } |
3087 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
3088 | goto netlbl_secattr_to_sid_return_cleanup; | |
3089 | ||
3090 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
3091 | if (rc != 0) | |
3092 | goto netlbl_secattr_to_sid_return_cleanup; | |
3093 | ||
5dbe1eb0 | 3094 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3095 | |
7420ed23 VY |
3096 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
3097 | } else { | |
388b2405 | 3098 | *sid = SECSID_NULL; |
7420ed23 VY |
3099 | rc = 0; |
3100 | } | |
3101 | ||
3102 | netlbl_secattr_to_sid_return: | |
0804d113 | 3103 | read_unlock(&policy_rwlock); |
7420ed23 VY |
3104 | return rc; |
3105 | netlbl_secattr_to_sid_return_cleanup: | |
3106 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
3107 | goto netlbl_secattr_to_sid_return; | |
3108 | } | |
3109 | ||
3110 | /** | |
5778eabd PM |
3111 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3112 | * @sid: the SELinux SID | |
3113 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3114 | * |
3115 | * Description: | |
5778eabd PM |
3116 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3117 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3118 | * |
3119 | */ | |
5778eabd | 3120 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3121 | { |
99d854d2 | 3122 | int rc; |
7420ed23 VY |
3123 | struct context *ctx; |
3124 | ||
3125 | if (!ss_initialized) | |
3126 | return 0; | |
3127 | ||
0804d113 | 3128 | read_lock(&policy_rwlock); |
7420ed23 | 3129 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
3130 | if (ctx == NULL) { |
3131 | rc = -ENOENT; | |
5778eabd | 3132 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 3133 | } |
5778eabd PM |
3134 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
3135 | GFP_ATOMIC); | |
99d854d2 PM |
3136 | if (secattr->domain == NULL) { |
3137 | rc = -ENOMEM; | |
3138 | goto netlbl_sid_to_secattr_failure; | |
3139 | } | |
8d75899d PM |
3140 | secattr->attr.secid = sid; |
3141 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3142 | mls_export_netlbl_lvl(ctx, secattr); |
3143 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 3144 | if (rc != 0) |
5778eabd | 3145 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 3146 | read_unlock(&policy_rwlock); |
99f59ed0 | 3147 | |
5778eabd | 3148 | return 0; |
f8687afe | 3149 | |
5778eabd | 3150 | netlbl_sid_to_secattr_failure: |
0804d113 | 3151 | read_unlock(&policy_rwlock); |
f8687afe PM |
3152 | return rc; |
3153 | } | |
7420ed23 | 3154 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3155 | |
3156 | /** | |
3157 | * security_read_policy - read the policy. | |
3158 | * @data: binary policy data | |
3159 | * @len: length of data in bytes | |
3160 | * | |
3161 | */ | |
3162 | int security_read_policy(void **data, ssize_t *len) | |
3163 | { | |
3164 | int rc; | |
3165 | struct policy_file fp; | |
3166 | ||
3167 | if (!ss_initialized) | |
3168 | return -EINVAL; | |
3169 | ||
3170 | *len = security_policydb_len(); | |
3171 | ||
3172 | *data = vmalloc(*len); | |
3173 | if (!*data) | |
3174 | return -ENOMEM; | |
3175 | ||
3176 | fp.data = *data; | |
3177 | fp.len = *len; | |
3178 | ||
3179 | read_lock(&policy_rwlock); | |
3180 | rc = policydb_write(&policydb, &fp); | |
3181 | read_unlock(&policy_rwlock); | |
3182 | ||
3183 | if (rc) | |
3184 | return rc; | |
3185 | ||
3186 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3187 | return 0; | |
3188 | ||
3189 | } |