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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
7efbb60b | 4 | * Authors : Stephen Smalley, <sds@tycho.nsa.gov> |
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 | * |
82c21bfa | 16 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
7420ed23 VY |
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> |
f0d3d989 | 54 | #include <linux/vmalloc.h> |
7420ed23 | 55 | #include <net/netlabel.h> |
bb003079 | 56 | |
1da177e4 LT |
57 | #include "flask.h" |
58 | #include "avc.h" | |
59 | #include "avc_ss.h" | |
60 | #include "security.h" | |
61 | #include "context.h" | |
62 | #include "policydb.h" | |
63 | #include "sidtab.h" | |
64 | #include "services.h" | |
65 | #include "conditional.h" | |
66 | #include "mls.h" | |
7420ed23 | 67 | #include "objsec.h" |
c60475bf | 68 | #include "netlabel.h" |
3de4bab5 | 69 | #include "xfrm.h" |
02752760 | 70 | #include "ebitmap.h" |
9d57a7f9 | 71 | #include "audit.h" |
1da177e4 | 72 | |
4dc2fce3 SS |
73 | /* Policy capability names */ |
74 | char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = { | |
75 | "network_peer_controls", | |
76 | "open_perms", | |
77 | "extended_socket_class", | |
78 | "always_check_network", | |
af63f419 SS |
79 | "cgroup_seclabel", |
80 | "nnp_nosuid_transition" | |
4dc2fce3 SS |
81 | }; |
82 | ||
3bb56b25 | 83 | int selinux_policycap_netpeer; |
b0c636b9 | 84 | int selinux_policycap_openperm; |
da69a530 | 85 | int selinux_policycap_extsockclass; |
2be4d74f | 86 | int selinux_policycap_alwaysnetwork; |
2651225b | 87 | int selinux_policycap_cgroupseclabel; |
af63f419 | 88 | int selinux_policycap_nnp_nosuid_transition; |
3bb56b25 | 89 | |
1da177e4 | 90 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
91 | |
92 | static struct sidtab sidtab; | |
93 | struct policydb policydb; | |
5d55a345 | 94 | int ss_initialized; |
1da177e4 LT |
95 | |
96 | /* | |
97 | * The largest sequence number that has been used when | |
98 | * providing an access decision to the access vector cache. | |
99 | * The sequence number only changes when a policy change | |
100 | * occurs. | |
101 | */ | |
5d55a345 | 102 | static u32 latest_granting; |
1da177e4 LT |
103 | |
104 | /* Forward declaration. */ | |
105 | static int context_struct_to_string(struct context *context, char **scontext, | |
106 | u32 *scontext_len); | |
107 | ||
19439d05 | 108 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
109 | struct context *tcontext, |
110 | u16 tclass, | |
111 | struct av_decision *avd, | |
112 | struct extended_perms *xperms); | |
c6d3aaa4 SS |
113 | |
114 | struct selinux_mapping { | |
115 | u16 value; /* policy value */ | |
116 | unsigned num_perms; | |
117 | u32 perms[sizeof(u32) * 8]; | |
118 | }; | |
119 | ||
120 | static struct selinux_mapping *current_mapping; | |
121 | static u16 current_mapping_size; | |
122 | ||
123 | static int selinux_set_mapping(struct policydb *pol, | |
124 | struct security_class_mapping *map, | |
125 | struct selinux_mapping **out_map_p, | |
126 | u16 *out_map_size) | |
127 | { | |
128 | struct selinux_mapping *out_map = NULL; | |
129 | size_t size = sizeof(struct selinux_mapping); | |
130 | u16 i, j; | |
131 | unsigned k; | |
132 | bool print_unknown_handle = false; | |
133 | ||
134 | /* Find number of classes in the input mapping */ | |
135 | if (!map) | |
136 | return -EINVAL; | |
137 | i = 0; | |
138 | while (map[i].name) | |
139 | i++; | |
140 | ||
141 | /* Allocate space for the class records, plus one for class zero */ | |
142 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
143 | if (!out_map) | |
144 | return -ENOMEM; | |
145 | ||
146 | /* Store the raw class and permission values */ | |
147 | j = 0; | |
148 | while (map[j].name) { | |
149 | struct security_class_mapping *p_in = map + (j++); | |
150 | struct selinux_mapping *p_out = out_map + j; | |
151 | ||
152 | /* An empty class string skips ahead */ | |
153 | if (!strcmp(p_in->name, "")) { | |
154 | p_out->num_perms = 0; | |
155 | continue; | |
156 | } | |
157 | ||
158 | p_out->value = string_to_security_class(pol, p_in->name); | |
159 | if (!p_out->value) { | |
160 | printk(KERN_INFO | |
161 | "SELinux: Class %s not defined in policy.\n", | |
162 | p_in->name); | |
163 | if (pol->reject_unknown) | |
164 | goto err; | |
165 | p_out->num_perms = 0; | |
166 | print_unknown_handle = true; | |
167 | continue; | |
168 | } | |
169 | ||
170 | k = 0; | |
342e9157 | 171 | while (p_in->perms[k]) { |
c6d3aaa4 SS |
172 | /* An empty permission string skips ahead */ |
173 | if (!*p_in->perms[k]) { | |
174 | k++; | |
175 | continue; | |
176 | } | |
177 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
178 | p_in->perms[k]); | |
179 | if (!p_out->perms[k]) { | |
180 | printk(KERN_INFO | |
181 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
182 | p_in->perms[k], p_in->name); | |
183 | if (pol->reject_unknown) | |
184 | goto err; | |
185 | print_unknown_handle = true; | |
186 | } | |
187 | ||
188 | k++; | |
189 | } | |
190 | p_out->num_perms = k; | |
191 | } | |
192 | ||
193 | if (print_unknown_handle) | |
194 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
195 | pol->allow_unknown ? "allowed" : "denied"); | |
196 | ||
197 | *out_map_p = out_map; | |
198 | *out_map_size = i; | |
199 | return 0; | |
200 | err: | |
201 | kfree(out_map); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Get real, policy values from mapped values | |
207 | */ | |
208 | ||
209 | static u16 unmap_class(u16 tclass) | |
210 | { | |
211 | if (tclass < current_mapping_size) | |
212 | return current_mapping[tclass].value; | |
213 | ||
214 | return tclass; | |
215 | } | |
216 | ||
6f5317e7 HC |
217 | /* |
218 | * Get kernel value for class from its policy value | |
219 | */ | |
220 | static u16 map_class(u16 pol_value) | |
221 | { | |
222 | u16 i; | |
223 | ||
224 | for (i = 1; i < current_mapping_size; i++) { | |
225 | if (current_mapping[i].value == pol_value) | |
226 | return i; | |
227 | } | |
228 | ||
85cd6da5 | 229 | return SECCLASS_NULL; |
6f5317e7 HC |
230 | } |
231 | ||
c6d3aaa4 SS |
232 | static void map_decision(u16 tclass, struct av_decision *avd, |
233 | int allow_unknown) | |
234 | { | |
235 | if (tclass < current_mapping_size) { | |
236 | unsigned i, n = current_mapping[tclass].num_perms; | |
237 | u32 result; | |
238 | ||
239 | for (i = 0, result = 0; i < n; i++) { | |
240 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
241 | result |= 1<<i; | |
242 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
243 | result |= 1<<i; | |
244 | } | |
245 | avd->allowed = result; | |
246 | ||
247 | for (i = 0, result = 0; i < n; i++) | |
248 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
249 | result |= 1<<i; | |
250 | avd->auditallow = result; | |
251 | ||
252 | for (i = 0, result = 0; i < n; i++) { | |
253 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
254 | result |= 1<<i; | |
255 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
256 | result |= 1<<i; | |
257 | } | |
0bce9527 EP |
258 | /* |
259 | * In case the kernel has a bug and requests a permission | |
260 | * between num_perms and the maximum permission number, we | |
261 | * should audit that denial | |
262 | */ | |
263 | for (; i < (sizeof(u32)*8); i++) | |
264 | result |= 1<<i; | |
c6d3aaa4 SS |
265 | avd->auditdeny = result; |
266 | } | |
267 | } | |
268 | ||
0719aaf5 GT |
269 | int security_mls_enabled(void) |
270 | { | |
271 | return policydb.mls_enabled; | |
272 | } | |
c6d3aaa4 | 273 | |
1da177e4 LT |
274 | /* |
275 | * Return the boolean value of a constraint expression | |
276 | * when it is applied to the specified source and target | |
277 | * security contexts. | |
278 | * | |
279 | * xcontext is a special beast... It is used by the validatetrans rules | |
280 | * only. For these rules, scontext is the context before the transition, | |
281 | * tcontext is the context after the transition, and xcontext is the context | |
282 | * of the process performing the transition. All other callers of | |
283 | * constraint_expr_eval should pass in NULL for xcontext. | |
284 | */ | |
285 | static int constraint_expr_eval(struct context *scontext, | |
286 | struct context *tcontext, | |
287 | struct context *xcontext, | |
288 | struct constraint_expr *cexpr) | |
289 | { | |
290 | u32 val1, val2; | |
291 | struct context *c; | |
292 | struct role_datum *r1, *r2; | |
293 | struct mls_level *l1, *l2; | |
294 | struct constraint_expr *e; | |
295 | int s[CEXPR_MAXDEPTH]; | |
296 | int sp = -1; | |
297 | ||
298 | for (e = cexpr; e; e = e->next) { | |
299 | switch (e->expr_type) { | |
300 | case CEXPR_NOT: | |
301 | BUG_ON(sp < 0); | |
302 | s[sp] = !s[sp]; | |
303 | break; | |
304 | case CEXPR_AND: | |
305 | BUG_ON(sp < 1); | |
306 | sp--; | |
c1a7368a | 307 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
308 | break; |
309 | case CEXPR_OR: | |
310 | BUG_ON(sp < 1); | |
311 | sp--; | |
c1a7368a | 312 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
313 | break; |
314 | case CEXPR_ATTR: | |
c1a7368a | 315 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
316 | return 0; |
317 | switch (e->attr) { | |
318 | case CEXPR_USER: | |
319 | val1 = scontext->user; | |
320 | val2 = tcontext->user; | |
321 | break; | |
322 | case CEXPR_TYPE: | |
323 | val1 = scontext->type; | |
324 | val2 = tcontext->type; | |
325 | break; | |
326 | case CEXPR_ROLE: | |
327 | val1 = scontext->role; | |
328 | val2 = tcontext->role; | |
329 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
330 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
331 | switch (e->op) { | |
332 | case CEXPR_DOM: | |
333 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
334 | val2 - 1); | |
335 | continue; | |
336 | case CEXPR_DOMBY: | |
337 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
338 | val1 - 1); | |
339 | continue; | |
340 | case CEXPR_INCOMP: | |
5d55a345 EP |
341 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
342 | val2 - 1) && | |
343 | !ebitmap_get_bit(&r2->dominates, | |
344 | val1 - 1)); | |
1da177e4 LT |
345 | continue; |
346 | default: | |
347 | break; | |
348 | } | |
349 | break; | |
350 | case CEXPR_L1L2: | |
351 | l1 = &(scontext->range.level[0]); | |
352 | l2 = &(tcontext->range.level[0]); | |
353 | goto mls_ops; | |
354 | case CEXPR_L1H2: | |
355 | l1 = &(scontext->range.level[0]); | |
356 | l2 = &(tcontext->range.level[1]); | |
357 | goto mls_ops; | |
358 | case CEXPR_H1L2: | |
359 | l1 = &(scontext->range.level[1]); | |
360 | l2 = &(tcontext->range.level[0]); | |
361 | goto mls_ops; | |
362 | case CEXPR_H1H2: | |
363 | l1 = &(scontext->range.level[1]); | |
364 | l2 = &(tcontext->range.level[1]); | |
365 | goto mls_ops; | |
366 | case CEXPR_L1H1: | |
367 | l1 = &(scontext->range.level[0]); | |
368 | l2 = &(scontext->range.level[1]); | |
369 | goto mls_ops; | |
370 | case CEXPR_L2H2: | |
371 | l1 = &(tcontext->range.level[0]); | |
372 | l2 = &(tcontext->range.level[1]); | |
373 | goto mls_ops; | |
374 | mls_ops: | |
375 | switch (e->op) { | |
376 | case CEXPR_EQ: | |
377 | s[++sp] = mls_level_eq(l1, l2); | |
378 | continue; | |
379 | case CEXPR_NEQ: | |
380 | s[++sp] = !mls_level_eq(l1, l2); | |
381 | continue; | |
382 | case CEXPR_DOM: | |
383 | s[++sp] = mls_level_dom(l1, l2); | |
384 | continue; | |
385 | case CEXPR_DOMBY: | |
386 | s[++sp] = mls_level_dom(l2, l1); | |
387 | continue; | |
388 | case CEXPR_INCOMP: | |
389 | s[++sp] = mls_level_incomp(l2, l1); | |
390 | continue; | |
391 | default: | |
392 | BUG(); | |
393 | return 0; | |
394 | } | |
395 | break; | |
396 | default: | |
397 | BUG(); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | switch (e->op) { | |
402 | case CEXPR_EQ: | |
403 | s[++sp] = (val1 == val2); | |
404 | break; | |
405 | case CEXPR_NEQ: | |
406 | s[++sp] = (val1 != val2); | |
407 | break; | |
408 | default: | |
409 | BUG(); | |
410 | return 0; | |
411 | } | |
412 | break; | |
413 | case CEXPR_NAMES: | |
414 | if (sp == (CEXPR_MAXDEPTH-1)) | |
415 | return 0; | |
416 | c = scontext; | |
417 | if (e->attr & CEXPR_TARGET) | |
418 | c = tcontext; | |
419 | else if (e->attr & CEXPR_XTARGET) { | |
420 | c = xcontext; | |
421 | if (!c) { | |
422 | BUG(); | |
423 | return 0; | |
424 | } | |
425 | } | |
426 | if (e->attr & CEXPR_USER) | |
427 | val1 = c->user; | |
428 | else if (e->attr & CEXPR_ROLE) | |
429 | val1 = c->role; | |
430 | else if (e->attr & CEXPR_TYPE) | |
431 | val1 = c->type; | |
432 | else { | |
433 | BUG(); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | switch (e->op) { | |
438 | case CEXPR_EQ: | |
439 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
440 | break; | |
441 | case CEXPR_NEQ: | |
442 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
443 | break; | |
444 | default: | |
445 | BUG(); | |
446 | return 0; | |
447 | } | |
448 | break; | |
449 | default: | |
450 | BUG(); | |
451 | return 0; | |
452 | } | |
453 | } | |
454 | ||
455 | BUG_ON(sp != 0); | |
456 | return s[0]; | |
457 | } | |
458 | ||
44c2d9bd KK |
459 | /* |
460 | * security_dump_masked_av - dumps masked permissions during | |
461 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
462 | */ | |
463 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
464 | { | |
465 | struct perm_datum *pdatum = d; | |
466 | char **permission_names = args; | |
467 | ||
468 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
469 | ||
470 | permission_names[pdatum->value - 1] = (char *)k; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | static void security_dump_masked_av(struct context *scontext, | |
476 | struct context *tcontext, | |
477 | u16 tclass, | |
478 | u32 permissions, | |
479 | const char *reason) | |
480 | { | |
481 | struct common_datum *common_dat; | |
482 | struct class_datum *tclass_dat; | |
483 | struct audit_buffer *ab; | |
484 | char *tclass_name; | |
485 | char *scontext_name = NULL; | |
486 | char *tcontext_name = NULL; | |
487 | char *permission_names[32]; | |
2da5d31b JM |
488 | int index; |
489 | u32 length; | |
44c2d9bd KK |
490 | bool need_comma = false; |
491 | ||
492 | if (!permissions) | |
493 | return; | |
494 | ||
ac76c05b | 495 | tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1); |
44c2d9bd KK |
496 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; |
497 | common_dat = tclass_dat->comdatum; | |
498 | ||
499 | /* init permission_names */ | |
500 | if (common_dat && | |
501 | hashtab_map(common_dat->permissions.table, | |
502 | dump_masked_av_helper, permission_names) < 0) | |
503 | goto out; | |
504 | ||
505 | if (hashtab_map(tclass_dat->permissions.table, | |
506 | dump_masked_av_helper, permission_names) < 0) | |
507 | goto out; | |
508 | ||
509 | /* get scontext/tcontext in text form */ | |
510 | if (context_struct_to_string(scontext, | |
511 | &scontext_name, &length) < 0) | |
512 | goto out; | |
513 | ||
514 | if (context_struct_to_string(tcontext, | |
515 | &tcontext_name, &length) < 0) | |
516 | goto out; | |
517 | ||
518 | /* audit a message */ | |
519 | ab = audit_log_start(current->audit_context, | |
520 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
521 | if (!ab) | |
522 | goto out; | |
523 | ||
524 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
525 | "scontext=%s tcontext=%s tclass=%s perms=", | |
526 | reason, scontext_name, tcontext_name, tclass_name); | |
527 | ||
528 | for (index = 0; index < 32; index++) { | |
529 | u32 mask = (1 << index); | |
530 | ||
531 | if ((mask & permissions) == 0) | |
532 | continue; | |
533 | ||
534 | audit_log_format(ab, "%s%s", | |
535 | need_comma ? "," : "", | |
536 | permission_names[index] | |
537 | ? permission_names[index] : "????"); | |
538 | need_comma = true; | |
539 | } | |
540 | audit_log_end(ab); | |
541 | out: | |
542 | /* release scontext/tcontext */ | |
543 | kfree(tcontext_name); | |
544 | kfree(scontext_name); | |
545 | ||
546 | return; | |
547 | } | |
548 | ||
d9250dea KK |
549 | /* |
550 | * security_boundary_permission - drops violated permissions | |
551 | * on boundary constraint. | |
552 | */ | |
553 | static void type_attribute_bounds_av(struct context *scontext, | |
554 | struct context *tcontext, | |
555 | u16 tclass, | |
d9250dea KK |
556 | struct av_decision *avd) |
557 | { | |
2ae3ba39 | 558 | struct context lo_scontext; |
7ea59202 | 559 | struct context lo_tcontext, *tcontextp = tcontext; |
2ae3ba39 | 560 | struct av_decision lo_avd; |
23bdecb0 EP |
561 | struct type_datum *source; |
562 | struct type_datum *target; | |
2ae3ba39 | 563 | u32 masked = 0; |
d9250dea | 564 | |
23bdecb0 EP |
565 | source = flex_array_get_ptr(policydb.type_val_to_struct_array, |
566 | scontext->type - 1); | |
567 | BUG_ON(!source); | |
568 | ||
7ea59202 SS |
569 | if (!source->bounds) |
570 | return; | |
571 | ||
23bdecb0 EP |
572 | target = flex_array_get_ptr(policydb.type_val_to_struct_array, |
573 | tcontext->type - 1); | |
574 | BUG_ON(!target); | |
575 | ||
7ea59202 | 576 | memset(&lo_avd, 0, sizeof(lo_avd)); |
d9250dea | 577 | |
7ea59202 SS |
578 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); |
579 | lo_scontext.type = source->bounds; | |
2ae3ba39 KK |
580 | |
581 | if (target->bounds) { | |
2ae3ba39 KK |
582 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); |
583 | lo_tcontext.type = target->bounds; | |
7ea59202 | 584 | tcontextp = &lo_tcontext; |
2ae3ba39 KK |
585 | } |
586 | ||
7ea59202 SS |
587 | context_struct_compute_av(&lo_scontext, |
588 | tcontextp, | |
589 | tclass, | |
590 | &lo_avd, | |
591 | NULL); | |
2ae3ba39 | 592 | |
7ea59202 | 593 | masked = ~lo_avd.allowed & avd->allowed; |
d9250dea | 594 | |
7ea59202 SS |
595 | if (likely(!masked)) |
596 | return; /* no masked permission */ | |
d9250dea | 597 | |
7ea59202 SS |
598 | /* mask violated permissions */ |
599 | avd->allowed &= ~masked; | |
600 | ||
601 | /* audit masked permissions */ | |
602 | security_dump_masked_av(scontext, tcontext, | |
603 | tclass, masked, "bounds"); | |
d9250dea KK |
604 | } |
605 | ||
1da177e4 | 606 | /* |
fa1aa143 JVS |
607 | * flag which drivers have permissions |
608 | * only looking for ioctl based extended permssions | |
609 | */ | |
610 | void services_compute_xperms_drivers( | |
611 | struct extended_perms *xperms, | |
612 | struct avtab_node *node) | |
613 | { | |
614 | unsigned int i; | |
615 | ||
616 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
617 | /* if one or more driver has all permissions allowed */ | |
618 | for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++) | |
619 | xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i]; | |
620 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
621 | /* if allowing permissions within a driver */ | |
622 | security_xperm_set(xperms->drivers.p, | |
623 | node->datum.u.xperms->driver); | |
624 | } | |
625 | ||
626 | /* If no ioctl commands are allowed, ignore auditallow and auditdeny */ | |
627 | if (node->key.specified & AVTAB_XPERMS_ALLOWED) | |
628 | xperms->len = 1; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Compute access vectors and extended permissions based on a context | |
633 | * structure pair for the permissions in a particular class. | |
1da177e4 | 634 | */ |
19439d05 | 635 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
636 | struct context *tcontext, |
637 | u16 tclass, | |
638 | struct av_decision *avd, | |
639 | struct extended_perms *xperms) | |
1da177e4 LT |
640 | { |
641 | struct constraint_node *constraint; | |
642 | struct role_allow *ra; | |
643 | struct avtab_key avkey; | |
782ebb99 | 644 | struct avtab_node *node; |
1da177e4 | 645 | struct class_datum *tclass_datum; |
782ebb99 SS |
646 | struct ebitmap *sattr, *tattr; |
647 | struct ebitmap_node *snode, *tnode; | |
648 | unsigned int i, j; | |
1da177e4 | 649 | |
1da177e4 | 650 | avd->allowed = 0; |
1da177e4 LT |
651 | avd->auditallow = 0; |
652 | avd->auditdeny = 0xffffffff; | |
fa1aa143 JVS |
653 | if (xperms) { |
654 | memset(&xperms->drivers, 0, sizeof(xperms->drivers)); | |
655 | xperms->len = 0; | |
656 | } | |
1da177e4 | 657 | |
c6d3aaa4 SS |
658 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
659 | if (printk_ratelimit()) | |
660 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 661 | return; |
c6d3aaa4 | 662 | } |
3f12070e EP |
663 | |
664 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
665 | ||
1da177e4 LT |
666 | /* |
667 | * If a specific type enforcement rule was defined for | |
668 | * this permission check, then use it. | |
669 | */ | |
1da177e4 | 670 | avkey.target_class = tclass; |
fa1aa143 | 671 | avkey.specified = AVTAB_AV | AVTAB_XPERMS; |
6371dcd3 EP |
672 | sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1); |
673 | BUG_ON(!sattr); | |
674 | tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1); | |
675 | BUG_ON(!tattr); | |
9fe79ad1 KK |
676 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
677 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
678 | avkey.source_type = i + 1; |
679 | avkey.target_type = j + 1; | |
680 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 681 | node; |
782ebb99 SS |
682 | node = avtab_search_node_next(node, avkey.specified)) { |
683 | if (node->key.specified == AVTAB_ALLOWED) | |
fa1aa143 | 684 | avd->allowed |= node->datum.u.data; |
782ebb99 | 685 | else if (node->key.specified == AVTAB_AUDITALLOW) |
fa1aa143 | 686 | avd->auditallow |= node->datum.u.data; |
782ebb99 | 687 | else if (node->key.specified == AVTAB_AUDITDENY) |
fa1aa143 JVS |
688 | avd->auditdeny &= node->datum.u.data; |
689 | else if (xperms && (node->key.specified & AVTAB_XPERMS)) | |
690 | services_compute_xperms_drivers(xperms, node); | |
782ebb99 | 691 | } |
1da177e4 | 692 | |
782ebb99 | 693 | /* Check conditional av table for additional permissions */ |
fa1aa143 JVS |
694 | cond_compute_av(&policydb.te_cond_avtab, &avkey, |
695 | avd, xperms); | |
782ebb99 SS |
696 | |
697 | } | |
698 | } | |
1da177e4 LT |
699 | |
700 | /* | |
701 | * Remove any permissions prohibited by a constraint (this includes | |
702 | * the MLS policy). | |
703 | */ | |
704 | constraint = tclass_datum->constraints; | |
705 | while (constraint) { | |
706 | if ((constraint->permissions & (avd->allowed)) && | |
707 | !constraint_expr_eval(scontext, tcontext, NULL, | |
708 | constraint->expr)) { | |
caabbdc0 | 709 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
710 | } |
711 | constraint = constraint->next; | |
712 | } | |
713 | ||
714 | /* | |
715 | * If checking process transition permission and the | |
716 | * role is changing, then check the (current_role, new_role) | |
717 | * pair. | |
718 | */ | |
c6d3aaa4 SS |
719 | if (tclass == policydb.process_class && |
720 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
721 | scontext->role != tcontext->role) { |
722 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
723 | if (scontext->role == ra->role && | |
724 | tcontext->role == ra->new_role) | |
725 | break; | |
726 | } | |
727 | if (!ra) | |
c6d3aaa4 | 728 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
729 | } |
730 | ||
d9250dea KK |
731 | /* |
732 | * If the given source and target types have boundary | |
733 | * constraint, lazy checks have to mask any violated | |
734 | * permission and notice it to userspace via audit. | |
735 | */ | |
736 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 737 | tclass, avd); |
1da177e4 LT |
738 | } |
739 | ||
740 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
741 | struct context *ncontext, |
742 | struct context *tcontext, | |
743 | u16 tclass) | |
1da177e4 LT |
744 | { |
745 | char *o = NULL, *n = NULL, *t = NULL; | |
746 | u32 olen, nlen, tlen; | |
747 | ||
4b02b524 | 748 | if (context_struct_to_string(ocontext, &o, &olen)) |
1da177e4 | 749 | goto out; |
4b02b524 | 750 | if (context_struct_to_string(ncontext, &n, &nlen)) |
1da177e4 | 751 | goto out; |
4b02b524 | 752 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 753 | goto out; |
9ad9ad38 | 754 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 | 755 | "op=security_validate_transition seresult=denied" |
5d55a345 | 756 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", |
ac76c05b | 757 | o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
758 | out: |
759 | kfree(o); | |
760 | kfree(n); | |
761 | kfree(t); | |
762 | ||
763 | if (!selinux_enforcing) | |
764 | return 0; | |
765 | return -EPERM; | |
766 | } | |
767 | ||
f9df6458 AP |
768 | static int security_compute_validatetrans(u32 oldsid, u32 newsid, u32 tasksid, |
769 | u16 orig_tclass, bool user) | |
1da177e4 LT |
770 | { |
771 | struct context *ocontext; | |
772 | struct context *ncontext; | |
773 | struct context *tcontext; | |
774 | struct class_datum *tclass_datum; | |
775 | struct constraint_node *constraint; | |
c6d3aaa4 | 776 | u16 tclass; |
1da177e4 LT |
777 | int rc = 0; |
778 | ||
779 | if (!ss_initialized) | |
780 | return 0; | |
781 | ||
0804d113 | 782 | read_lock(&policy_rwlock); |
1da177e4 | 783 | |
f9df6458 AP |
784 | if (!user) |
785 | tclass = unmap_class(orig_tclass); | |
786 | else | |
787 | tclass = orig_tclass; | |
c6d3aaa4 | 788 | |
1da177e4 | 789 | if (!tclass || tclass > policydb.p_classes.nprim) { |
1da177e4 LT |
790 | rc = -EINVAL; |
791 | goto out; | |
792 | } | |
793 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
794 | ||
795 | ocontext = sidtab_search(&sidtab, oldsid); | |
796 | if (!ocontext) { | |
744ba35e EP |
797 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
798 | __func__, oldsid); | |
1da177e4 LT |
799 | rc = -EINVAL; |
800 | goto out; | |
801 | } | |
802 | ||
803 | ncontext = sidtab_search(&sidtab, newsid); | |
804 | if (!ncontext) { | |
744ba35e EP |
805 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
806 | __func__, newsid); | |
1da177e4 LT |
807 | rc = -EINVAL; |
808 | goto out; | |
809 | } | |
810 | ||
811 | tcontext = sidtab_search(&sidtab, tasksid); | |
812 | if (!tcontext) { | |
744ba35e EP |
813 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
814 | __func__, tasksid); | |
1da177e4 LT |
815 | rc = -EINVAL; |
816 | goto out; | |
817 | } | |
818 | ||
819 | constraint = tclass_datum->validatetrans; | |
820 | while (constraint) { | |
821 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 822 | constraint->expr)) { |
f9df6458 AP |
823 | if (user) |
824 | rc = -EPERM; | |
825 | else | |
826 | rc = security_validtrans_handle_fail(ocontext, | |
827 | ncontext, | |
828 | tcontext, | |
829 | tclass); | |
1da177e4 LT |
830 | goto out; |
831 | } | |
832 | constraint = constraint->next; | |
833 | } | |
834 | ||
835 | out: | |
0804d113 | 836 | read_unlock(&policy_rwlock); |
1da177e4 LT |
837 | return rc; |
838 | } | |
839 | ||
f9df6458 AP |
840 | int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, |
841 | u16 tclass) | |
842 | { | |
843 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
844 | tclass, true); | |
845 | } | |
846 | ||
847 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
848 | u16 orig_tclass) | |
849 | { | |
850 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
851 | orig_tclass, false); | |
852 | } | |
853 | ||
d9250dea KK |
854 | /* |
855 | * security_bounded_transition - check whether the given | |
856 | * transition is directed to bounded, or not. | |
857 | * It returns 0, if @newsid is bounded by @oldsid. | |
858 | * Otherwise, it returns error code. | |
859 | * | |
860 | * @oldsid : current security identifier | |
861 | * @newsid : destinated security identifier | |
862 | */ | |
863 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
864 | { | |
865 | struct context *old_context, *new_context; | |
866 | struct type_datum *type; | |
867 | int index; | |
4b02b524 | 868 | int rc; |
d9250dea | 869 | |
a72ddf7c PM |
870 | if (!ss_initialized) |
871 | return 0; | |
872 | ||
d9250dea KK |
873 | read_lock(&policy_rwlock); |
874 | ||
4b02b524 | 875 | rc = -EINVAL; |
d9250dea KK |
876 | old_context = sidtab_search(&sidtab, old_sid); |
877 | if (!old_context) { | |
878 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
879 | __func__, old_sid); | |
880 | goto out; | |
881 | } | |
882 | ||
4b02b524 | 883 | rc = -EINVAL; |
d9250dea KK |
884 | new_context = sidtab_search(&sidtab, new_sid); |
885 | if (!new_context) { | |
886 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
887 | __func__, new_sid); | |
888 | goto out; | |
889 | } | |
890 | ||
4b02b524 | 891 | rc = 0; |
af901ca1 | 892 | /* type/domain unchanged */ |
4b02b524 | 893 | if (old_context->type == new_context->type) |
d9250dea | 894 | goto out; |
d9250dea KK |
895 | |
896 | index = new_context->type; | |
897 | while (true) { | |
23bdecb0 EP |
898 | type = flex_array_get_ptr(policydb.type_val_to_struct_array, |
899 | index - 1); | |
d9250dea KK |
900 | BUG_ON(!type); |
901 | ||
902 | /* not bounded anymore */ | |
4b02b524 EP |
903 | rc = -EPERM; |
904 | if (!type->bounds) | |
d9250dea | 905 | break; |
d9250dea KK |
906 | |
907 | /* @newsid is bounded by @oldsid */ | |
4b02b524 EP |
908 | rc = 0; |
909 | if (type->bounds == old_context->type) | |
d9250dea | 910 | break; |
4b02b524 | 911 | |
d9250dea KK |
912 | index = type->bounds; |
913 | } | |
44c2d9bd KK |
914 | |
915 | if (rc) { | |
916 | char *old_name = NULL; | |
917 | char *new_name = NULL; | |
2da5d31b | 918 | u32 length; |
44c2d9bd KK |
919 | |
920 | if (!context_struct_to_string(old_context, | |
921 | &old_name, &length) && | |
922 | !context_struct_to_string(new_context, | |
923 | &new_name, &length)) { | |
924 | audit_log(current->audit_context, | |
925 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
926 | "op=security_bounded_transition " | |
4093a844 | 927 | "seresult=denied " |
44c2d9bd KK |
928 | "oldcontext=%s newcontext=%s", |
929 | old_name, new_name); | |
930 | } | |
931 | kfree(new_name); | |
932 | kfree(old_name); | |
933 | } | |
d9250dea KK |
934 | out: |
935 | read_unlock(&policy_rwlock); | |
936 | ||
937 | return rc; | |
938 | } | |
939 | ||
19439d05 | 940 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 941 | { |
19439d05 SS |
942 | avd->allowed = 0; |
943 | avd->auditallow = 0; | |
944 | avd->auditdeny = 0xffffffff; | |
945 | avd->seqno = latest_granting; | |
946 | avd->flags = 0; | |
c6d3aaa4 SS |
947 | } |
948 | ||
fa1aa143 JVS |
949 | void services_compute_xperms_decision(struct extended_perms_decision *xpermd, |
950 | struct avtab_node *node) | |
951 | { | |
952 | unsigned int i; | |
953 | ||
954 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
955 | if (xpermd->driver != node->datum.u.xperms->driver) | |
956 | return; | |
957 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
958 | if (!security_xperm_test(node->datum.u.xperms->perms.p, | |
959 | xpermd->driver)) | |
960 | return; | |
961 | } else { | |
962 | BUG(); | |
963 | } | |
964 | ||
965 | if (node->key.specified == AVTAB_XPERMS_ALLOWED) { | |
966 | xpermd->used |= XPERMS_ALLOWED; | |
967 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
968 | memset(xpermd->allowed->p, 0xff, | |
969 | sizeof(xpermd->allowed->p)); | |
970 | } | |
971 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
972 | for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) | |
973 | xpermd->allowed->p[i] |= | |
974 | node->datum.u.xperms->perms.p[i]; | |
975 | } | |
976 | } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { | |
977 | xpermd->used |= XPERMS_AUDITALLOW; | |
978 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
979 | memset(xpermd->auditallow->p, 0xff, | |
980 | sizeof(xpermd->auditallow->p)); | |
981 | } | |
982 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
983 | for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) | |
984 | xpermd->auditallow->p[i] |= | |
985 | node->datum.u.xperms->perms.p[i]; | |
986 | } | |
987 | } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { | |
988 | xpermd->used |= XPERMS_DONTAUDIT; | |
989 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
990 | memset(xpermd->dontaudit->p, 0xff, | |
991 | sizeof(xpermd->dontaudit->p)); | |
992 | } | |
993 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
994 | for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) | |
995 | xpermd->dontaudit->p[i] |= | |
996 | node->datum.u.xperms->perms.p[i]; | |
997 | } | |
998 | } else { | |
999 | BUG(); | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | void security_compute_xperms_decision(u32 ssid, | |
1004 | u32 tsid, | |
1005 | u16 orig_tclass, | |
1006 | u8 driver, | |
1007 | struct extended_perms_decision *xpermd) | |
1008 | { | |
1009 | u16 tclass; | |
1010 | struct context *scontext, *tcontext; | |
1011 | struct avtab_key avkey; | |
1012 | struct avtab_node *node; | |
1013 | struct ebitmap *sattr, *tattr; | |
1014 | struct ebitmap_node *snode, *tnode; | |
1015 | unsigned int i, j; | |
1016 | ||
1017 | xpermd->driver = driver; | |
1018 | xpermd->used = 0; | |
1019 | memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); | |
1020 | memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); | |
1021 | memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); | |
1022 | ||
1023 | read_lock(&policy_rwlock); | |
1024 | if (!ss_initialized) | |
1025 | goto allow; | |
1026 | ||
1027 | scontext = sidtab_search(&sidtab, ssid); | |
1028 | if (!scontext) { | |
1029 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1030 | __func__, ssid); | |
1031 | goto out; | |
1032 | } | |
1033 | ||
1034 | tcontext = sidtab_search(&sidtab, tsid); | |
1035 | if (!tcontext) { | |
1036 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1037 | __func__, tsid); | |
1038 | goto out; | |
1039 | } | |
1040 | ||
1041 | tclass = unmap_class(orig_tclass); | |
1042 | if (unlikely(orig_tclass && !tclass)) { | |
1043 | if (policydb.allow_unknown) | |
1044 | goto allow; | |
1045 | goto out; | |
1046 | } | |
1047 | ||
1048 | ||
1049 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { | |
1050 | pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); | |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | avkey.target_class = tclass; | |
1055 | avkey.specified = AVTAB_XPERMS; | |
1056 | sattr = flex_array_get(policydb.type_attr_map_array, | |
1057 | scontext->type - 1); | |
1058 | BUG_ON(!sattr); | |
1059 | tattr = flex_array_get(policydb.type_attr_map_array, | |
1060 | tcontext->type - 1); | |
1061 | BUG_ON(!tattr); | |
1062 | ebitmap_for_each_positive_bit(sattr, snode, i) { | |
1063 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
1064 | avkey.source_type = i + 1; | |
1065 | avkey.target_type = j + 1; | |
1066 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
1067 | node; | |
1068 | node = avtab_search_node_next(node, avkey.specified)) | |
1069 | services_compute_xperms_decision(xpermd, node); | |
1070 | ||
1071 | cond_compute_xperms(&policydb.te_cond_avtab, | |
1072 | &avkey, xpermd); | |
1073 | } | |
1074 | } | |
1075 | out: | |
1076 | read_unlock(&policy_rwlock); | |
1077 | return; | |
1078 | allow: | |
1079 | memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); | |
1080 | goto out; | |
1081 | } | |
19439d05 | 1082 | |
1da177e4 LT |
1083 | /** |
1084 | * security_compute_av - Compute access vector decisions. | |
1085 | * @ssid: source security identifier | |
1086 | * @tsid: target security identifier | |
1087 | * @tclass: target security class | |
1da177e4 | 1088 | * @avd: access vector decisions |
fa1aa143 | 1089 | * @xperms: extended permissions |
1da177e4 LT |
1090 | * |
1091 | * Compute a set of access vector decisions based on the | |
1092 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 1093 | */ |
19439d05 SS |
1094 | void security_compute_av(u32 ssid, |
1095 | u32 tsid, | |
1096 | u16 orig_tclass, | |
fa1aa143 JVS |
1097 | struct av_decision *avd, |
1098 | struct extended_perms *xperms) | |
1da177e4 | 1099 | { |
c6d3aaa4 | 1100 | u16 tclass; |
19439d05 | 1101 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 1102 | |
b7f3008a | 1103 | read_lock(&policy_rwlock); |
19439d05 | 1104 | avd_init(avd); |
fa1aa143 | 1105 | xperms->len = 0; |
c6d3aaa4 SS |
1106 | if (!ss_initialized) |
1107 | goto allow; | |
1108 | ||
19439d05 SS |
1109 | scontext = sidtab_search(&sidtab, ssid); |
1110 | if (!scontext) { | |
1111 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1112 | __func__, ssid); | |
1113 | goto out; | |
1114 | } | |
1115 | ||
1116 | /* permissive domain? */ | |
1117 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1118 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1119 | ||
1120 | tcontext = sidtab_search(&sidtab, tsid); | |
1121 | if (!tcontext) { | |
1122 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1123 | __func__, tsid); | |
1124 | goto out; | |
1125 | } | |
1126 | ||
c6d3aaa4 SS |
1127 | tclass = unmap_class(orig_tclass); |
1128 | if (unlikely(orig_tclass && !tclass)) { | |
1129 | if (policydb.allow_unknown) | |
1130 | goto allow; | |
b7f3008a | 1131 | goto out; |
c6d3aaa4 | 1132 | } |
fa1aa143 | 1133 | context_struct_compute_av(scontext, tcontext, tclass, avd, xperms); |
c6d3aaa4 | 1134 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 1135 | out: |
c6d3aaa4 | 1136 | read_unlock(&policy_rwlock); |
19439d05 | 1137 | return; |
c6d3aaa4 SS |
1138 | allow: |
1139 | avd->allowed = 0xffffffff; | |
b7f3008a | 1140 | goto out; |
c6d3aaa4 SS |
1141 | } |
1142 | ||
19439d05 SS |
1143 | void security_compute_av_user(u32 ssid, |
1144 | u32 tsid, | |
1145 | u16 tclass, | |
1146 | struct av_decision *avd) | |
c6d3aaa4 | 1147 | { |
19439d05 | 1148 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 1149 | |
19439d05 SS |
1150 | read_lock(&policy_rwlock); |
1151 | avd_init(avd); | |
1152 | if (!ss_initialized) | |
1153 | goto allow; | |
1154 | ||
1155 | scontext = sidtab_search(&sidtab, ssid); | |
1156 | if (!scontext) { | |
1157 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1158 | __func__, ssid); | |
1159 | goto out; | |
1da177e4 LT |
1160 | } |
1161 | ||
19439d05 SS |
1162 | /* permissive domain? */ |
1163 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1164 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1165 | ||
1166 | tcontext = sidtab_search(&sidtab, tsid); | |
1167 | if (!tcontext) { | |
1168 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1169 | __func__, tsid); | |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | if (unlikely(!tclass)) { | |
1174 | if (policydb.allow_unknown) | |
1175 | goto allow; | |
1176 | goto out; | |
1177 | } | |
1178 | ||
fa1aa143 | 1179 | context_struct_compute_av(scontext, tcontext, tclass, avd, NULL); |
19439d05 | 1180 | out: |
0804d113 | 1181 | read_unlock(&policy_rwlock); |
19439d05 SS |
1182 | return; |
1183 | allow: | |
1184 | avd->allowed = 0xffffffff; | |
1185 | goto out; | |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | /* | |
1189 | * Write the security context string representation of | |
1190 | * the context structure `context' into a dynamically | |
1191 | * allocated string of the correct size. Set `*scontext' | |
1192 | * to point to this string and set `*scontext_len' to | |
1193 | * the length of the string. | |
1194 | */ | |
1195 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1196 | { | |
1197 | char *scontextp; | |
1198 | ||
d5630b9d EP |
1199 | if (scontext) |
1200 | *scontext = NULL; | |
1da177e4 LT |
1201 | *scontext_len = 0; |
1202 | ||
12b29f34 SS |
1203 | if (context->len) { |
1204 | *scontext_len = context->len; | |
bb7081ab EP |
1205 | if (scontext) { |
1206 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1207 | if (!(*scontext)) | |
1208 | return -ENOMEM; | |
1209 | } | |
12b29f34 SS |
1210 | return 0; |
1211 | } | |
1212 | ||
1da177e4 | 1213 | /* Compute the size of the context. */ |
ac76c05b EP |
1214 | *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; |
1215 | *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; | |
1216 | *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; | |
1da177e4 LT |
1217 | *scontext_len += mls_compute_context_len(context); |
1218 | ||
d5630b9d EP |
1219 | if (!scontext) |
1220 | return 0; | |
1221 | ||
1da177e4 LT |
1222 | /* Allocate space for the context; caller must free this space. */ |
1223 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1224 | if (!scontextp) |
1da177e4 | 1225 | return -ENOMEM; |
1da177e4 LT |
1226 | *scontext = scontextp; |
1227 | ||
1228 | /* | |
1229 | * Copy the user name, role name and type name into the context. | |
1230 | */ | |
9529c788 | 1231 | scontextp += sprintf(scontextp, "%s:%s:%s", |
ac76c05b EP |
1232 | sym_name(&policydb, SYM_USERS, context->user - 1), |
1233 | sym_name(&policydb, SYM_ROLES, context->role - 1), | |
1234 | sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1da177e4 LT |
1235 | |
1236 | mls_sid_to_context(context, &scontextp); | |
1237 | ||
1238 | *scontextp = 0; | |
1239 | ||
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | #include "initial_sid_to_string.h" | |
1244 | ||
f0ee2e46 JC |
1245 | const char *security_get_initial_sid_context(u32 sid) |
1246 | { | |
1247 | if (unlikely(sid > SECINITSID_NUM)) | |
1248 | return NULL; | |
1249 | return initial_sid_to_string[sid]; | |
1250 | } | |
1251 | ||
12b29f34 SS |
1252 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1253 | u32 *scontext_len, int force) | |
1da177e4 LT |
1254 | { |
1255 | struct context *context; | |
1256 | int rc = 0; | |
1257 | ||
d5630b9d EP |
1258 | if (scontext) |
1259 | *scontext = NULL; | |
4f4acf3a SS |
1260 | *scontext_len = 0; |
1261 | ||
1da177e4 LT |
1262 | if (!ss_initialized) { |
1263 | if (sid <= SECINITSID_NUM) { | |
1264 | char *scontextp; | |
1265 | ||
1266 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1267 | if (!scontext) |
1268 | goto out; | |
aa736c36 RV |
1269 | scontextp = kmemdup(initial_sid_to_string[sid], |
1270 | *scontext_len, GFP_ATOMIC); | |
0cccca06 SH |
1271 | if (!scontextp) { |
1272 | rc = -ENOMEM; | |
1273 | goto out; | |
1274 | } | |
1da177e4 LT |
1275 | *scontext = scontextp; |
1276 | goto out; | |
1277 | } | |
744ba35e EP |
1278 | printk(KERN_ERR "SELinux: %s: called before initial " |
1279 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1280 | rc = -EINVAL; |
1281 | goto out; | |
1282 | } | |
0804d113 | 1283 | read_lock(&policy_rwlock); |
12b29f34 SS |
1284 | if (force) |
1285 | context = sidtab_search_force(&sidtab, sid); | |
1286 | else | |
1287 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1288 | if (!context) { |
744ba35e EP |
1289 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1290 | __func__, sid); | |
1da177e4 LT |
1291 | rc = -EINVAL; |
1292 | goto out_unlock; | |
1293 | } | |
1294 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1295 | out_unlock: | |
0804d113 | 1296 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1297 | out: |
1298 | return rc; | |
1299 | ||
1300 | } | |
1301 | ||
12b29f34 SS |
1302 | /** |
1303 | * security_sid_to_context - Obtain a context for a given SID. | |
1304 | * @sid: security identifier, SID | |
1305 | * @scontext: security context | |
1306 | * @scontext_len: length in bytes | |
1307 | * | |
1308 | * Write the string representation of the context associated with @sid | |
1309 | * into a dynamically allocated string of the correct size. Set @scontext | |
1310 | * to point to this string and set @scontext_len to the length of the string. | |
1311 | */ | |
1312 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1313 | { |
12b29f34 SS |
1314 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1315 | } | |
1316 | ||
1317 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1318 | { | |
1319 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1320 | } | |
1321 | ||
9a59daa0 SS |
1322 | /* |
1323 | * Caveat: Mutates scontext. | |
1324 | */ | |
12b29f34 SS |
1325 | static int string_to_context_struct(struct policydb *pol, |
1326 | struct sidtab *sidtabp, | |
9a59daa0 | 1327 | char *scontext, |
12b29f34 SS |
1328 | u32 scontext_len, |
1329 | struct context *ctx, | |
9a59daa0 | 1330 | u32 def_sid) |
12b29f34 | 1331 | { |
1da177e4 LT |
1332 | struct role_datum *role; |
1333 | struct type_datum *typdatum; | |
1334 | struct user_datum *usrdatum; | |
1335 | char *scontextp, *p, oldc; | |
1336 | int rc = 0; | |
1337 | ||
12b29f34 | 1338 | context_init(ctx); |
1da177e4 | 1339 | |
1da177e4 LT |
1340 | /* Parse the security context. */ |
1341 | ||
1342 | rc = -EINVAL; | |
9a59daa0 | 1343 | scontextp = (char *) scontext; |
1da177e4 LT |
1344 | |
1345 | /* Extract the user. */ | |
1346 | p = scontextp; | |
1347 | while (*p && *p != ':') | |
1348 | p++; | |
1349 | ||
1350 | if (*p == 0) | |
12b29f34 | 1351 | goto out; |
1da177e4 LT |
1352 | |
1353 | *p++ = 0; | |
1354 | ||
12b29f34 | 1355 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1356 | if (!usrdatum) |
12b29f34 | 1357 | goto out; |
1da177e4 | 1358 | |
12b29f34 | 1359 | ctx->user = usrdatum->value; |
1da177e4 LT |
1360 | |
1361 | /* Extract role. */ | |
1362 | scontextp = p; | |
1363 | while (*p && *p != ':') | |
1364 | p++; | |
1365 | ||
1366 | if (*p == 0) | |
12b29f34 | 1367 | goto out; |
1da177e4 LT |
1368 | |
1369 | *p++ = 0; | |
1370 | ||
12b29f34 | 1371 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1372 | if (!role) |
12b29f34 SS |
1373 | goto out; |
1374 | ctx->role = role->value; | |
1da177e4 LT |
1375 | |
1376 | /* Extract type. */ | |
1377 | scontextp = p; | |
1378 | while (*p && *p != ':') | |
1379 | p++; | |
1380 | oldc = *p; | |
1381 | *p++ = 0; | |
1382 | ||
12b29f34 | 1383 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1384 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1385 | goto out; |
1da177e4 | 1386 | |
12b29f34 | 1387 | ctx->type = typdatum->value; |
1da177e4 | 1388 | |
12b29f34 | 1389 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1390 | if (rc) |
12b29f34 | 1391 | goto out; |
1da177e4 | 1392 | |
4b02b524 EP |
1393 | rc = -EINVAL; |
1394 | if ((p - scontext) < scontext_len) | |
12b29f34 | 1395 | goto out; |
1da177e4 LT |
1396 | |
1397 | /* Check the validity of the new context. */ | |
4b02b524 | 1398 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1399 | goto out; |
12b29f34 SS |
1400 | rc = 0; |
1401 | out: | |
8e531af9 EP |
1402 | if (rc) |
1403 | context_destroy(ctx); | |
12b29f34 SS |
1404 | return rc; |
1405 | } | |
1406 | ||
1407 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1408 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1409 | int force) | |
1410 | { | |
9a59daa0 | 1411 | char *scontext2, *str = NULL; |
12b29f34 SS |
1412 | struct context context; |
1413 | int rc = 0; | |
1414 | ||
2172fa70 SS |
1415 | /* An empty security context is never valid. */ |
1416 | if (!scontext_len) | |
1417 | return -EINVAL; | |
1418 | ||
29784034 PM |
1419 | /* Copy the string to allow changes and ensure a NUL terminator */ |
1420 | scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags); | |
1421 | if (!scontext2) | |
1422 | return -ENOMEM; | |
1423 | ||
12b29f34 SS |
1424 | if (!ss_initialized) { |
1425 | int i; | |
1426 | ||
1427 | for (i = 1; i < SECINITSID_NUM; i++) { | |
29784034 | 1428 | if (!strcmp(initial_sid_to_string[i], scontext2)) { |
12b29f34 | 1429 | *sid = i; |
29784034 | 1430 | goto out; |
12b29f34 SS |
1431 | } |
1432 | } | |
1433 | *sid = SECINITSID_KERNEL; | |
29784034 | 1434 | goto out; |
12b29f34 SS |
1435 | } |
1436 | *sid = SECSID_NULL; | |
1437 | ||
9a59daa0 SS |
1438 | if (force) { |
1439 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1440 | rc = -ENOMEM; |
9a59daa0 | 1441 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1442 | if (!str) |
1443 | goto out; | |
9a59daa0 SS |
1444 | } |
1445 | ||
0804d113 | 1446 | read_lock(&policy_rwlock); |
4b02b524 EP |
1447 | rc = string_to_context_struct(&policydb, &sidtab, scontext2, |
1448 | scontext_len, &context, def_sid); | |
12b29f34 | 1449 | if (rc == -EINVAL && force) { |
9a59daa0 | 1450 | context.str = str; |
12b29f34 | 1451 | context.len = scontext_len; |
9a59daa0 | 1452 | str = NULL; |
12b29f34 | 1453 | } else if (rc) |
4b02b524 | 1454 | goto out_unlock; |
12b29f34 | 1455 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
8e531af9 | 1456 | context_destroy(&context); |
4b02b524 | 1457 | out_unlock: |
0804d113 | 1458 | read_unlock(&policy_rwlock); |
4b02b524 | 1459 | out: |
9a59daa0 SS |
1460 | kfree(scontext2); |
1461 | kfree(str); | |
1da177e4 LT |
1462 | return rc; |
1463 | } | |
1464 | ||
f5c1d5b2 JM |
1465 | /** |
1466 | * security_context_to_sid - Obtain a SID for a given security context. | |
1467 | * @scontext: security context | |
1468 | * @scontext_len: length in bytes | |
1469 | * @sid: security identifier, SID | |
52a4c640 | 1470 | * @gfp: context for the allocation |
f5c1d5b2 JM |
1471 | * |
1472 | * Obtains a SID associated with the security context that | |
1473 | * has the string representation specified by @scontext. | |
1474 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1475 | * memory is available, or 0 on success. | |
1476 | */ | |
52a4c640 NA |
1477 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid, |
1478 | gfp_t gfp) | |
f5c1d5b2 JM |
1479 | { |
1480 | return security_context_to_sid_core(scontext, scontext_len, | |
52a4c640 | 1481 | sid, SECSID_NULL, gfp, 0); |
44be2f65 RV |
1482 | } |
1483 | ||
1484 | int security_context_str_to_sid(const char *scontext, u32 *sid, gfp_t gfp) | |
1485 | { | |
1486 | return security_context_to_sid(scontext, strlen(scontext), sid, gfp); | |
f5c1d5b2 JM |
1487 | } |
1488 | ||
1489 | /** | |
1490 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1491 | * falling back to specified default if needed. | |
1492 | * | |
1493 | * @scontext: security context | |
1494 | * @scontext_len: length in bytes | |
1495 | * @sid: security identifier, SID | |
d133a960 | 1496 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1497 | * |
1498 | * Obtains a SID associated with the security context that | |
1499 | * has the string representation specified by @scontext. | |
1500 | * The default SID is passed to the MLS layer to be used to allow | |
1501 | * kernel labeling of the MLS field if the MLS field is not present | |
1502 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1503 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1504 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1505 | * memory is available, or 0 on success. | |
1506 | */ | |
7bf570dc DH |
1507 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1508 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1509 | { |
1510 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1511 | sid, def_sid, gfp_flags, 1); |
1512 | } | |
1513 | ||
1514 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1515 | u32 *sid) | |
1516 | { | |
1517 | return security_context_to_sid_core(scontext, scontext_len, | |
1518 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1519 | } |
1520 | ||
1da177e4 LT |
1521 | static int compute_sid_handle_invalid_context( |
1522 | struct context *scontext, | |
1523 | struct context *tcontext, | |
1524 | u16 tclass, | |
1525 | struct context *newcontext) | |
1526 | { | |
1527 | char *s = NULL, *t = NULL, *n = NULL; | |
1528 | u32 slen, tlen, nlen; | |
1529 | ||
4b02b524 | 1530 | if (context_struct_to_string(scontext, &s, &slen)) |
1da177e4 | 1531 | goto out; |
4b02b524 | 1532 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 1533 | goto out; |
4b02b524 | 1534 | if (context_struct_to_string(newcontext, &n, &nlen)) |
1da177e4 | 1535 | goto out; |
9ad9ad38 | 1536 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 RGB |
1537 | "op=security_compute_sid invalid_context=%s" |
1538 | " scontext=%s" | |
1da177e4 LT |
1539 | " tcontext=%s" |
1540 | " tclass=%s", | |
ac76c05b | 1541 | n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
1542 | out: |
1543 | kfree(s); | |
1544 | kfree(t); | |
1545 | kfree(n); | |
1546 | if (!selinux_enforcing) | |
1547 | return 0; | |
1548 | return -EACCES; | |
1549 | } | |
1550 | ||
652bb9b0 | 1551 | static void filename_compute_type(struct policydb *p, struct context *newcontext, |
2667991f | 1552 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1553 | const char *objname) |
652bb9b0 | 1554 | { |
2463c26d EP |
1555 | struct filename_trans ft; |
1556 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1557 | |
1558 | /* | |
1559 | * Most filename trans rules are going to live in specific directories | |
1560 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1561 | * if the ttype does not contain any rules. | |
1562 | */ | |
1563 | if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype)) | |
1564 | return; | |
1565 | ||
2463c26d EP |
1566 | ft.stype = stype; |
1567 | ft.ttype = ttype; | |
1568 | ft.tclass = tclass; | |
1569 | ft.name = objname; | |
1570 | ||
1571 | otype = hashtab_search(p->filename_trans, &ft); | |
1572 | if (otype) | |
1573 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1574 | } |
1575 | ||
1da177e4 LT |
1576 | static int security_compute_sid(u32 ssid, |
1577 | u32 tsid, | |
c6d3aaa4 | 1578 | u16 orig_tclass, |
1da177e4 | 1579 | u32 specified, |
f50a3ec9 | 1580 | const char *objname, |
c6d3aaa4 SS |
1581 | u32 *out_sid, |
1582 | bool kern) | |
1da177e4 | 1583 | { |
aa893269 | 1584 | struct class_datum *cladatum = NULL; |
1da177e4 LT |
1585 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
1586 | struct role_trans *roletr = NULL; | |
1587 | struct avtab_key avkey; | |
1588 | struct avtab_datum *avdatum; | |
1589 | struct avtab_node *node; | |
c6d3aaa4 | 1590 | u16 tclass; |
1da177e4 | 1591 | int rc = 0; |
6f5317e7 | 1592 | bool sock; |
1da177e4 LT |
1593 | |
1594 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1595 | switch (orig_tclass) { |
1596 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1597 | *out_sid = ssid; |
1598 | break; | |
1599 | default: | |
1600 | *out_sid = tsid; | |
1601 | break; | |
1602 | } | |
1603 | goto out; | |
1604 | } | |
1605 | ||
851f8a69 VY |
1606 | context_init(&newcontext); |
1607 | ||
0804d113 | 1608 | read_lock(&policy_rwlock); |
1da177e4 | 1609 | |
6f5317e7 | 1610 | if (kern) { |
c6d3aaa4 | 1611 | tclass = unmap_class(orig_tclass); |
6f5317e7 HC |
1612 | sock = security_is_socket_class(orig_tclass); |
1613 | } else { | |
c6d3aaa4 | 1614 | tclass = orig_tclass; |
6f5317e7 HC |
1615 | sock = security_is_socket_class(map_class(tclass)); |
1616 | } | |
c6d3aaa4 | 1617 | |
1da177e4 LT |
1618 | scontext = sidtab_search(&sidtab, ssid); |
1619 | if (!scontext) { | |
744ba35e EP |
1620 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1621 | __func__, ssid); | |
1da177e4 LT |
1622 | rc = -EINVAL; |
1623 | goto out_unlock; | |
1624 | } | |
1625 | tcontext = sidtab_search(&sidtab, tsid); | |
1626 | if (!tcontext) { | |
744ba35e EP |
1627 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1628 | __func__, tsid); | |
1da177e4 LT |
1629 | rc = -EINVAL; |
1630 | goto out_unlock; | |
1631 | } | |
1632 | ||
aa893269 EP |
1633 | if (tclass && tclass <= policydb.p_classes.nprim) |
1634 | cladatum = policydb.class_val_to_struct[tclass - 1]; | |
1635 | ||
1da177e4 LT |
1636 | /* Set the user identity. */ |
1637 | switch (specified) { | |
1638 | case AVTAB_TRANSITION: | |
1639 | case AVTAB_CHANGE: | |
aa893269 EP |
1640 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1641 | newcontext.user = tcontext->user; | |
1642 | } else { | |
1643 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1644 | /* Use the process user identity. */ | |
1645 | newcontext.user = scontext->user; | |
1646 | } | |
1da177e4 LT |
1647 | break; |
1648 | case AVTAB_MEMBER: | |
1649 | /* Use the related object owner. */ | |
1650 | newcontext.user = tcontext->user; | |
1651 | break; | |
1652 | } | |
1653 | ||
aa893269 EP |
1654 | /* Set the role to default values. */ |
1655 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1656 | newcontext.role = scontext->role; |
aa893269 EP |
1657 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1658 | newcontext.role = tcontext->role; | |
1659 | } else { | |
1660 | if ((tclass == policydb.process_class) || (sock == true)) | |
1661 | newcontext.role = scontext->role; | |
1662 | else | |
1663 | newcontext.role = OBJECT_R_VAL; | |
1664 | } | |
1665 | ||
1666 | /* Set the type to default values. */ | |
eed7795d | 1667 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1668 | newcontext.type = scontext->type; |
eed7795d | 1669 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1670 | newcontext.type = tcontext->type; |
eed7795d EP |
1671 | } else { |
1672 | if ((tclass == policydb.process_class) || (sock == true)) { | |
1673 | /* Use the type of process. */ | |
1674 | newcontext.type = scontext->type; | |
1675 | } else { | |
1676 | /* Use the type of the related object. */ | |
1677 | newcontext.type = tcontext->type; | |
1678 | } | |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | /* Look for a type transition/member/change rule. */ | |
1682 | avkey.source_type = scontext->type; | |
1683 | avkey.target_type = tcontext->type; | |
1684 | avkey.target_class = tclass; | |
782ebb99 SS |
1685 | avkey.specified = specified; |
1686 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1687 | |
1688 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1689 | if (!avdatum) { |
782ebb99 | 1690 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1691 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1692 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1693 | avdatum = &node->datum; |
1694 | break; | |
1695 | } | |
1696 | } | |
1697 | } | |
1698 | ||
782ebb99 | 1699 | if (avdatum) { |
1da177e4 | 1700 | /* Use the type from the type transition/member/change rule. */ |
fa1aa143 | 1701 | newcontext.type = avdatum->u.data; |
1da177e4 LT |
1702 | } |
1703 | ||
4742600c | 1704 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1705 | if (objname) |
652bb9b0 | 1706 | filename_compute_type(&policydb, &newcontext, scontext->type, |
f50a3ec9 | 1707 | tcontext->type, tclass, objname); |
652bb9b0 | 1708 | |
1da177e4 | 1709 | /* Check for class-specific changes. */ |
63a312ca HC |
1710 | if (specified & AVTAB_TRANSITION) { |
1711 | /* Look for a role transition rule. */ | |
1712 | for (roletr = policydb.role_tr; roletr; roletr = roletr->next) { | |
1713 | if ((roletr->role == scontext->role) && | |
1714 | (roletr->type == tcontext->type) && | |
1715 | (roletr->tclass == tclass)) { | |
1716 | /* Use the role transition rule. */ | |
1717 | newcontext.role = roletr->new_role; | |
1718 | break; | |
1da177e4 LT |
1719 | } |
1720 | } | |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | /* Set the MLS attributes. | |
1724 | This is done last because it may allocate memory. */ | |
6f5317e7 HC |
1725 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, |
1726 | &newcontext, sock); | |
1da177e4 LT |
1727 | if (rc) |
1728 | goto out_unlock; | |
1729 | ||
1730 | /* Check the validity of the context. */ | |
1731 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1732 | rc = compute_sid_handle_invalid_context(scontext, | |
1733 | tcontext, | |
1734 | tclass, | |
1735 | &newcontext); | |
1736 | if (rc) | |
1737 | goto out_unlock; | |
1738 | } | |
1739 | /* Obtain the sid for the context. */ | |
1740 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1741 | out_unlock: | |
0804d113 | 1742 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1743 | context_destroy(&newcontext); |
1744 | out: | |
1745 | return rc; | |
1746 | } | |
1747 | ||
1748 | /** | |
1749 | * security_transition_sid - Compute the SID for a new subject/object. | |
1750 | * @ssid: source security identifier | |
1751 | * @tsid: target security identifier | |
1752 | * @tclass: target security class | |
1753 | * @out_sid: security identifier for new subject/object | |
1754 | * | |
1755 | * Compute a SID to use for labeling a new subject or object in the | |
1756 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1757 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1758 | * if insufficient memory is available, or %0 if the new SID was | |
1759 | * computed successfully. | |
1760 | */ | |
652bb9b0 EP |
1761 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, |
1762 | const struct qstr *qstr, u32 *out_sid) | |
1da177e4 | 1763 | { |
c6d3aaa4 | 1764 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
f50a3ec9 | 1765 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1766 | } |
1767 | ||
f50a3ec9 KK |
1768 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, |
1769 | const char *objname, u32 *out_sid) | |
c6d3aaa4 SS |
1770 | { |
1771 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
f50a3ec9 | 1772 | objname, out_sid, false); |
1da177e4 LT |
1773 | } |
1774 | ||
1775 | /** | |
1776 | * security_member_sid - Compute the SID for member selection. | |
1777 | * @ssid: source security identifier | |
1778 | * @tsid: target security identifier | |
1779 | * @tclass: target security class | |
1780 | * @out_sid: security identifier for selected member | |
1781 | * | |
1782 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1783 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1784 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1785 | * if insufficient memory is available, or %0 if the SID was | |
1786 | * computed successfully. | |
1787 | */ | |
1788 | int security_member_sid(u32 ssid, | |
1789 | u32 tsid, | |
1790 | u16 tclass, | |
1791 | u32 *out_sid) | |
1792 | { | |
652bb9b0 EP |
1793 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL, |
1794 | out_sid, false); | |
1da177e4 LT |
1795 | } |
1796 | ||
1797 | /** | |
1798 | * security_change_sid - Compute the SID for object relabeling. | |
1799 | * @ssid: source security identifier | |
1800 | * @tsid: target security identifier | |
1801 | * @tclass: target security class | |
1802 | * @out_sid: security identifier for selected member | |
1803 | * | |
1804 | * Compute a SID to use for relabeling an object of class @tclass | |
1805 | * based on a SID pair (@ssid, @tsid). | |
1806 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1807 | * if insufficient memory is available, or %0 if the SID was | |
1808 | * computed successfully. | |
1809 | */ | |
1810 | int security_change_sid(u32 ssid, | |
1811 | u32 tsid, | |
1812 | u16 tclass, | |
1813 | u32 *out_sid) | |
1814 | { | |
652bb9b0 EP |
1815 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, |
1816 | out_sid, false); | |
b94c7e67 CS |
1817 | } |
1818 | ||
1da177e4 LT |
1819 | /* Clone the SID into the new SID table. */ |
1820 | static int clone_sid(u32 sid, | |
1821 | struct context *context, | |
1822 | void *arg) | |
1823 | { | |
1824 | struct sidtab *s = arg; | |
1825 | ||
42596eaf GT |
1826 | if (sid > SECINITSID_NUM) |
1827 | return sidtab_insert(s, sid, context); | |
1828 | else | |
1829 | return 0; | |
1da177e4 LT |
1830 | } |
1831 | ||
1832 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1833 | { | |
4b02b524 EP |
1834 | char *s; |
1835 | u32 len; | |
1da177e4 | 1836 | |
4b02b524 EP |
1837 | if (selinux_enforcing) |
1838 | return -EINVAL; | |
1839 | ||
1840 | if (!context_struct_to_string(context, &s, &len)) { | |
1841 | printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); | |
1842 | kfree(s); | |
1da177e4 | 1843 | } |
4b02b524 | 1844 | return 0; |
1da177e4 LT |
1845 | } |
1846 | ||
1847 | struct convert_context_args { | |
1848 | struct policydb *oldp; | |
1849 | struct policydb *newp; | |
1850 | }; | |
1851 | ||
1852 | /* | |
1853 | * Convert the values in the security context | |
1854 | * structure `c' from the values specified | |
1855 | * in the policy `p->oldp' to the values specified | |
1856 | * in the policy `p->newp'. Verify that the | |
1857 | * context is valid under the new policy. | |
1858 | */ | |
1859 | static int convert_context(u32 key, | |
1860 | struct context *c, | |
1861 | void *p) | |
1862 | { | |
1863 | struct convert_context_args *args; | |
1864 | struct context oldc; | |
0719aaf5 GT |
1865 | struct ocontext *oc; |
1866 | struct mls_range *range; | |
1da177e4 LT |
1867 | struct role_datum *role; |
1868 | struct type_datum *typdatum; | |
1869 | struct user_datum *usrdatum; | |
1870 | char *s; | |
1871 | u32 len; | |
42596eaf GT |
1872 | int rc = 0; |
1873 | ||
1874 | if (key <= SECINITSID_NUM) | |
1875 | goto out; | |
1da177e4 LT |
1876 | |
1877 | args = p; | |
1878 | ||
12b29f34 SS |
1879 | if (c->str) { |
1880 | struct context ctx; | |
4b02b524 EP |
1881 | |
1882 | rc = -ENOMEM; | |
9a59daa0 | 1883 | s = kstrdup(c->str, GFP_KERNEL); |
4b02b524 | 1884 | if (!s) |
9a59daa0 | 1885 | goto out; |
4b02b524 | 1886 | |
9a59daa0 SS |
1887 | rc = string_to_context_struct(args->newp, NULL, s, |
1888 | c->len, &ctx, SECSID_NULL); | |
1889 | kfree(s); | |
12b29f34 | 1890 | if (!rc) { |
4b02b524 | 1891 | printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", |
12b29f34 SS |
1892 | c->str); |
1893 | /* Replace string with mapped representation. */ | |
1894 | kfree(c->str); | |
1895 | memcpy(c, &ctx, sizeof(*c)); | |
1896 | goto out; | |
1897 | } else if (rc == -EINVAL) { | |
1898 | /* Retain string representation for later mapping. */ | |
1899 | rc = 0; | |
1900 | goto out; | |
1901 | } else { | |
1902 | /* Other error condition, e.g. ENOMEM. */ | |
4b02b524 | 1903 | printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", |
12b29f34 SS |
1904 | c->str, -rc); |
1905 | goto out; | |
1906 | } | |
1907 | } | |
1908 | ||
1da177e4 LT |
1909 | rc = context_cpy(&oldc, c); |
1910 | if (rc) | |
1911 | goto out; | |
1912 | ||
1da177e4 | 1913 | /* Convert the user. */ |
4b02b524 | 1914 | rc = -EINVAL; |
1da177e4 | 1915 | usrdatum = hashtab_search(args->newp->p_users.table, |
ac76c05b | 1916 | sym_name(args->oldp, SYM_USERS, c->user - 1)); |
5d55a345 | 1917 | if (!usrdatum) |
1da177e4 | 1918 | goto bad; |
1da177e4 LT |
1919 | c->user = usrdatum->value; |
1920 | ||
1921 | /* Convert the role. */ | |
4b02b524 | 1922 | rc = -EINVAL; |
1da177e4 | 1923 | role = hashtab_search(args->newp->p_roles.table, |
ac76c05b | 1924 | sym_name(args->oldp, SYM_ROLES, c->role - 1)); |
5d55a345 | 1925 | if (!role) |
1da177e4 | 1926 | goto bad; |
1da177e4 LT |
1927 | c->role = role->value; |
1928 | ||
1929 | /* Convert the type. */ | |
4b02b524 | 1930 | rc = -EINVAL; |
1da177e4 | 1931 | typdatum = hashtab_search(args->newp->p_types.table, |
ac76c05b | 1932 | sym_name(args->oldp, SYM_TYPES, c->type - 1)); |
5d55a345 | 1933 | if (!typdatum) |
1da177e4 | 1934 | goto bad; |
1da177e4 LT |
1935 | c->type = typdatum->value; |
1936 | ||
0719aaf5 GT |
1937 | /* Convert the MLS fields if dealing with MLS policies */ |
1938 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1939 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1940 | if (rc) | |
1941 | goto bad; | |
1942 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1943 | /* | |
1944 | * Switching between MLS and non-MLS policy: | |
1945 | * free any storage used by the MLS fields in the | |
1946 | * context for all existing entries in the sidtab. | |
1947 | */ | |
1948 | mls_context_destroy(c); | |
1949 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1950 | /* | |
1951 | * Switching between non-MLS and MLS policy: | |
1952 | * ensure that the MLS fields of the context for all | |
1953 | * existing entries in the sidtab are filled in with a | |
1954 | * suitable default value, likely taken from one of the | |
1955 | * initial SIDs. | |
1956 | */ | |
1957 | oc = args->newp->ocontexts[OCON_ISID]; | |
1958 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1959 | oc = oc->next; | |
4b02b524 | 1960 | rc = -EINVAL; |
0719aaf5 GT |
1961 | if (!oc) { |
1962 | printk(KERN_ERR "SELinux: unable to look up" | |
1963 | " the initial SIDs list\n"); | |
1964 | goto bad; | |
1965 | } | |
1966 | range = &oc->context[0].range; | |
1967 | rc = mls_range_set(c, range); | |
1968 | if (rc) | |
1969 | goto bad; | |
1970 | } | |
1da177e4 LT |
1971 | |
1972 | /* Check the validity of the new context. */ | |
1973 | if (!policydb_context_isvalid(args->newp, c)) { | |
1974 | rc = convert_context_handle_invalid_context(&oldc); | |
1975 | if (rc) | |
1976 | goto bad; | |
1977 | } | |
1978 | ||
1979 | context_destroy(&oldc); | |
4b02b524 | 1980 | |
12b29f34 | 1981 | rc = 0; |
1da177e4 LT |
1982 | out: |
1983 | return rc; | |
1984 | bad: | |
12b29f34 | 1985 | /* Map old representation to string and save it. */ |
4b02b524 EP |
1986 | rc = context_struct_to_string(&oldc, &s, &len); |
1987 | if (rc) | |
1988 | return rc; | |
1da177e4 | 1989 | context_destroy(&oldc); |
12b29f34 SS |
1990 | context_destroy(c); |
1991 | c->str = s; | |
1992 | c->len = len; | |
4b02b524 | 1993 | printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", |
12b29f34 SS |
1994 | c->str); |
1995 | rc = 0; | |
1da177e4 LT |
1996 | goto out; |
1997 | } | |
1998 | ||
3bb56b25 PM |
1999 | static void security_load_policycaps(void) |
2000 | { | |
4dc2fce3 SS |
2001 | unsigned int i; |
2002 | struct ebitmap_node *node; | |
2003 | ||
3bb56b25 PM |
2004 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, |
2005 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
2006 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
2007 | POLICYDB_CAPABILITY_OPENPERM); | |
da69a530 SS |
2008 | selinux_policycap_extsockclass = ebitmap_get_bit(&policydb.policycaps, |
2009 | POLICYDB_CAPABILITY_EXTSOCKCLASS); | |
2be4d74f CP |
2010 | selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps, |
2011 | POLICYDB_CAPABILITY_ALWAYSNETWORK); | |
2651225b SS |
2012 | selinux_policycap_cgroupseclabel = |
2013 | ebitmap_get_bit(&policydb.policycaps, | |
2014 | POLICYDB_CAPABILITY_CGROUPSECLABEL); | |
af63f419 SS |
2015 | selinux_policycap_nnp_nosuid_transition = |
2016 | ebitmap_get_bit(&policydb.policycaps, | |
2017 | POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION); | |
4dc2fce3 SS |
2018 | |
2019 | for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) | |
2020 | pr_info("SELinux: policy capability %s=%d\n", | |
2021 | selinux_policycap_names[i], | |
2022 | ebitmap_get_bit(&policydb.policycaps, i)); | |
2023 | ||
2024 | ebitmap_for_each_positive_bit(&policydb.policycaps, node, i) { | |
2025 | if (i >= ARRAY_SIZE(selinux_policycap_names)) | |
2026 | pr_info("SELinux: unknown policy capability %u\n", | |
2027 | i); | |
2028 | } | |
3bb56b25 PM |
2029 | } |
2030 | ||
e900a7d9 | 2031 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
2032 | |
2033 | /** | |
2034 | * security_load_policy - Load a security policy configuration. | |
2035 | * @data: binary policy data | |
2036 | * @len: length of data in bytes | |
2037 | * | |
2038 | * Load a new set of security policy configuration data, | |
2039 | * validate it and convert the SID table as necessary. | |
2040 | * This function will flush the access vector cache after | |
2041 | * loading the new policy. | |
2042 | */ | |
2043 | int security_load_policy(void *data, size_t len) | |
2044 | { | |
b5495b42 | 2045 | struct policydb *oldpolicydb, *newpolicydb; |
1da177e4 | 2046 | struct sidtab oldsidtab, newsidtab; |
c6d3aaa4 | 2047 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
2048 | struct convert_context_args args; |
2049 | u32 seqno; | |
c6d3aaa4 | 2050 | u16 map_size; |
1da177e4 LT |
2051 | int rc = 0; |
2052 | struct policy_file file = { data, len }, *fp = &file; | |
2053 | ||
b5495b42 TG |
2054 | oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL); |
2055 | if (!oldpolicydb) { | |
2056 | rc = -ENOMEM; | |
2057 | goto out; | |
2058 | } | |
2059 | newpolicydb = oldpolicydb + 1; | |
2060 | ||
1da177e4 LT |
2061 | if (!ss_initialized) { |
2062 | avtab_cache_init(); | |
b4958c89 | 2063 | ebitmap_cache_init(); |
7c620ece | 2064 | hashtab_cache_init(); |
a2000050 EP |
2065 | rc = policydb_read(&policydb, fp); |
2066 | if (rc) { | |
1da177e4 | 2067 | avtab_cache_destroy(); |
b4958c89 | 2068 | ebitmap_cache_destroy(); |
7c620ece | 2069 | hashtab_cache_destroy(); |
b5495b42 | 2070 | goto out; |
1da177e4 | 2071 | } |
a2000050 | 2072 | |
cee74f47 | 2073 | policydb.len = len; |
a2000050 EP |
2074 | rc = selinux_set_mapping(&policydb, secclass_map, |
2075 | ¤t_mapping, | |
2076 | ¤t_mapping_size); | |
2077 | if (rc) { | |
1da177e4 LT |
2078 | policydb_destroy(&policydb); |
2079 | avtab_cache_destroy(); | |
b4958c89 | 2080 | ebitmap_cache_destroy(); |
7c620ece | 2081 | hashtab_cache_destroy(); |
b5495b42 | 2082 | goto out; |
1da177e4 | 2083 | } |
a2000050 EP |
2084 | |
2085 | rc = policydb_load_isids(&policydb, &sidtab); | |
2086 | if (rc) { | |
b94c7e67 CS |
2087 | policydb_destroy(&policydb); |
2088 | avtab_cache_destroy(); | |
b4958c89 | 2089 | ebitmap_cache_destroy(); |
7c620ece | 2090 | hashtab_cache_destroy(); |
b5495b42 | 2091 | goto out; |
b94c7e67 | 2092 | } |
a2000050 | 2093 | |
3bb56b25 | 2094 | security_load_policycaps(); |
1da177e4 | 2095 | ss_initialized = 1; |
4c443d1b | 2096 | seqno = ++latest_granting; |
1da177e4 | 2097 | selinux_complete_init(); |
4c443d1b SS |
2098 | avc_ss_reset(seqno); |
2099 | selnl_notify_policyload(seqno); | |
11904167 | 2100 | selinux_status_update_policyload(seqno); |
7420ed23 | 2101 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2102 | selinux_xfrm_notify_policyload(); |
b5495b42 | 2103 | goto out; |
1da177e4 LT |
2104 | } |
2105 | ||
2106 | #if 0 | |
2107 | sidtab_hash_eval(&sidtab, "sids"); | |
2108 | #endif | |
2109 | ||
b5495b42 | 2110 | rc = policydb_read(newpolicydb, fp); |
a2000050 | 2111 | if (rc) |
b5495b42 | 2112 | goto out; |
1da177e4 | 2113 | |
b5495b42 | 2114 | newpolicydb->len = len; |
0719aaf5 | 2115 | /* If switching between different policy types, log MLS status */ |
b5495b42 | 2116 | if (policydb.mls_enabled && !newpolicydb->mls_enabled) |
0719aaf5 | 2117 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); |
b5495b42 | 2118 | else if (!policydb.mls_enabled && newpolicydb->mls_enabled) |
0719aaf5 GT |
2119 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); |
2120 | ||
b5495b42 | 2121 | rc = policydb_load_isids(newpolicydb, &newsidtab); |
42596eaf GT |
2122 | if (rc) { |
2123 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
b5495b42 TG |
2124 | policydb_destroy(newpolicydb); |
2125 | goto out; | |
12b29f34 | 2126 | } |
1da177e4 | 2127 | |
b5495b42 | 2128 | rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size); |
a2000050 | 2129 | if (rc) |
b94c7e67 | 2130 | goto err; |
b94c7e67 | 2131 | |
b5495b42 | 2132 | rc = security_preserve_bools(newpolicydb); |
e900a7d9 | 2133 | if (rc) { |
454d972c | 2134 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
2135 | goto err; |
2136 | } | |
2137 | ||
1da177e4 LT |
2138 | /* Clone the SID table. */ |
2139 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
2140 | |
2141 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
2142 | if (rc) | |
1da177e4 | 2143 | goto err; |
1da177e4 | 2144 | |
12b29f34 SS |
2145 | /* |
2146 | * Convert the internal representations of contexts | |
2147 | * in the new SID table. | |
2148 | */ | |
1da177e4 | 2149 | args.oldp = &policydb; |
b5495b42 | 2150 | args.newp = newpolicydb; |
12b29f34 | 2151 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
2152 | if (rc) { |
2153 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
2154 | " representation of contexts in the new SID" | |
2155 | " table\n"); | |
12b29f34 | 2156 | goto err; |
0719aaf5 | 2157 | } |
1da177e4 LT |
2158 | |
2159 | /* Save the old policydb and SID table to free later. */ | |
b5495b42 | 2160 | memcpy(oldpolicydb, &policydb, sizeof(policydb)); |
1da177e4 LT |
2161 | sidtab_set(&oldsidtab, &sidtab); |
2162 | ||
2163 | /* Install the new policydb and SID table. */ | |
0804d113 | 2164 | write_lock_irq(&policy_rwlock); |
b5495b42 | 2165 | memcpy(&policydb, newpolicydb, sizeof(policydb)); |
1da177e4 | 2166 | sidtab_set(&sidtab, &newsidtab); |
3bb56b25 | 2167 | security_load_policycaps(); |
c6d3aaa4 SS |
2168 | oldmap = current_mapping; |
2169 | current_mapping = map; | |
2170 | current_mapping_size = map_size; | |
1da177e4 | 2171 | seqno = ++latest_granting; |
0804d113 | 2172 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2173 | |
2174 | /* Free the old policydb and SID table. */ | |
b5495b42 | 2175 | policydb_destroy(oldpolicydb); |
1da177e4 | 2176 | sidtab_destroy(&oldsidtab); |
c6d3aaa4 | 2177 | kfree(oldmap); |
1da177e4 LT |
2178 | |
2179 | avc_ss_reset(seqno); | |
2180 | selnl_notify_policyload(seqno); | |
11904167 | 2181 | selinux_status_update_policyload(seqno); |
7420ed23 | 2182 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2183 | selinux_xfrm_notify_policyload(); |
1da177e4 | 2184 | |
b5495b42 TG |
2185 | rc = 0; |
2186 | goto out; | |
1da177e4 LT |
2187 | |
2188 | err: | |
c6d3aaa4 | 2189 | kfree(map); |
1da177e4 | 2190 | sidtab_destroy(&newsidtab); |
b5495b42 | 2191 | policydb_destroy(newpolicydb); |
1da177e4 | 2192 | |
b5495b42 TG |
2193 | out: |
2194 | kfree(oldpolicydb); | |
2195 | return rc; | |
1da177e4 LT |
2196 | } |
2197 | ||
cee74f47 EP |
2198 | size_t security_policydb_len(void) |
2199 | { | |
2200 | size_t len; | |
2201 | ||
2202 | read_lock(&policy_rwlock); | |
2203 | len = policydb.len; | |
2204 | read_unlock(&policy_rwlock); | |
2205 | ||
2206 | return len; | |
2207 | } | |
2208 | ||
1da177e4 LT |
2209 | /** |
2210 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
2211 | * @protocol: protocol number |
2212 | * @port: port number | |
2213 | * @out_sid: security identifier | |
2214 | */ | |
3e112172 | 2215 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
2216 | { |
2217 | struct ocontext *c; | |
2218 | int rc = 0; | |
2219 | ||
0804d113 | 2220 | read_lock(&policy_rwlock); |
1da177e4 LT |
2221 | |
2222 | c = policydb.ocontexts[OCON_PORT]; | |
2223 | while (c) { | |
2224 | if (c->u.port.protocol == protocol && | |
2225 | c->u.port.low_port <= port && | |
2226 | c->u.port.high_port >= port) | |
2227 | break; | |
2228 | c = c->next; | |
2229 | } | |
2230 | ||
2231 | if (c) { | |
2232 | if (!c->sid[0]) { | |
2233 | rc = sidtab_context_to_sid(&sidtab, | |
2234 | &c->context[0], | |
2235 | &c->sid[0]); | |
2236 | if (rc) | |
2237 | goto out; | |
2238 | } | |
2239 | *out_sid = c->sid[0]; | |
2240 | } else { | |
2241 | *out_sid = SECINITSID_PORT; | |
2242 | } | |
2243 | ||
2244 | out: | |
0804d113 | 2245 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2246 | return rc; |
2247 | } | |
2248 | ||
cfc4d882 DJ |
2249 | /** |
2250 | * security_pkey_sid - Obtain the SID for a pkey. | |
2251 | * @subnet_prefix: Subnet Prefix | |
2252 | * @pkey_num: pkey number | |
2253 | * @out_sid: security identifier | |
2254 | */ | |
2255 | int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid) | |
2256 | { | |
2257 | struct ocontext *c; | |
2258 | int rc = 0; | |
2259 | ||
2260 | read_lock(&policy_rwlock); | |
2261 | ||
2262 | c = policydb.ocontexts[OCON_IBPKEY]; | |
2263 | while (c) { | |
2264 | if (c->u.ibpkey.low_pkey <= pkey_num && | |
2265 | c->u.ibpkey.high_pkey >= pkey_num && | |
2266 | c->u.ibpkey.subnet_prefix == subnet_prefix) | |
2267 | break; | |
2268 | ||
2269 | c = c->next; | |
2270 | } | |
2271 | ||
2272 | if (c) { | |
2273 | if (!c->sid[0]) { | |
2274 | rc = sidtab_context_to_sid(&sidtab, | |
2275 | &c->context[0], | |
2276 | &c->sid[0]); | |
2277 | if (rc) | |
2278 | goto out; | |
2279 | } | |
2280 | *out_sid = c->sid[0]; | |
2281 | } else | |
2282 | *out_sid = SECINITSID_UNLABELED; | |
2283 | ||
2284 | out: | |
2285 | read_unlock(&policy_rwlock); | |
2286 | return rc; | |
2287 | } | |
2288 | ||
ab861dfc DJ |
2289 | /** |
2290 | * security_ib_endport_sid - Obtain the SID for a subnet management interface. | |
2291 | * @dev_name: device name | |
2292 | * @port: port number | |
2293 | * @out_sid: security identifier | |
2294 | */ | |
2295 | int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid) | |
2296 | { | |
2297 | struct ocontext *c; | |
2298 | int rc = 0; | |
2299 | ||
2300 | read_lock(&policy_rwlock); | |
2301 | ||
2302 | c = policydb.ocontexts[OCON_IBENDPORT]; | |
2303 | while (c) { | |
2304 | if (c->u.ibendport.port == port_num && | |
2305 | !strncmp(c->u.ibendport.dev_name, | |
2306 | dev_name, | |
2307 | IB_DEVICE_NAME_MAX)) | |
2308 | break; | |
2309 | ||
2310 | c = c->next; | |
2311 | } | |
2312 | ||
2313 | if (c) { | |
2314 | if (!c->sid[0]) { | |
2315 | rc = sidtab_context_to_sid(&sidtab, | |
2316 | &c->context[0], | |
2317 | &c->sid[0]); | |
2318 | if (rc) | |
2319 | goto out; | |
2320 | } | |
2321 | *out_sid = c->sid[0]; | |
2322 | } else | |
2323 | *out_sid = SECINITSID_UNLABELED; | |
2324 | ||
2325 | out: | |
2326 | read_unlock(&policy_rwlock); | |
2327 | return rc; | |
2328 | } | |
2329 | ||
1da177e4 LT |
2330 | /** |
2331 | * security_netif_sid - Obtain the SID for a network interface. | |
2332 | * @name: interface name | |
2333 | * @if_sid: interface SID | |
1da177e4 | 2334 | */ |
e8bfdb9d | 2335 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
2336 | { |
2337 | int rc = 0; | |
2338 | struct ocontext *c; | |
2339 | ||
0804d113 | 2340 | read_lock(&policy_rwlock); |
1da177e4 LT |
2341 | |
2342 | c = policydb.ocontexts[OCON_NETIF]; | |
2343 | while (c) { | |
2344 | if (strcmp(name, c->u.name) == 0) | |
2345 | break; | |
2346 | c = c->next; | |
2347 | } | |
2348 | ||
2349 | if (c) { | |
2350 | if (!c->sid[0] || !c->sid[1]) { | |
2351 | rc = sidtab_context_to_sid(&sidtab, | |
2352 | &c->context[0], | |
2353 | &c->sid[0]); | |
2354 | if (rc) | |
2355 | goto out; | |
2356 | rc = sidtab_context_to_sid(&sidtab, | |
2357 | &c->context[1], | |
2358 | &c->sid[1]); | |
2359 | if (rc) | |
2360 | goto out; | |
2361 | } | |
2362 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2363 | } else |
1da177e4 | 2364 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2365 | |
2366 | out: | |
0804d113 | 2367 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2368 | return rc; |
2369 | } | |
2370 | ||
2371 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2372 | { | |
2373 | int i, fail = 0; | |
2374 | ||
5d55a345 EP |
2375 | for (i = 0; i < 4; i++) |
2376 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2377 | fail = 1; |
2378 | break; | |
2379 | } | |
2380 | ||
2381 | return !fail; | |
2382 | } | |
2383 | ||
2384 | /** | |
2385 | * security_node_sid - Obtain the SID for a node (host). | |
2386 | * @domain: communication domain aka address family | |
2387 | * @addrp: address | |
2388 | * @addrlen: address length in bytes | |
2389 | * @out_sid: security identifier | |
2390 | */ | |
2391 | int security_node_sid(u16 domain, | |
2392 | void *addrp, | |
2393 | u32 addrlen, | |
2394 | u32 *out_sid) | |
2395 | { | |
4b02b524 | 2396 | int rc; |
1da177e4 LT |
2397 | struct ocontext *c; |
2398 | ||
0804d113 | 2399 | read_lock(&policy_rwlock); |
1da177e4 LT |
2400 | |
2401 | switch (domain) { | |
2402 | case AF_INET: { | |
2403 | u32 addr; | |
2404 | ||
4b02b524 EP |
2405 | rc = -EINVAL; |
2406 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2407 | goto out; |
1da177e4 LT |
2408 | |
2409 | addr = *((u32 *)addrp); | |
2410 | ||
2411 | c = policydb.ocontexts[OCON_NODE]; | |
2412 | while (c) { | |
2413 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2414 | break; | |
2415 | c = c->next; | |
2416 | } | |
2417 | break; | |
2418 | } | |
2419 | ||
2420 | case AF_INET6: | |
4b02b524 EP |
2421 | rc = -EINVAL; |
2422 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2423 | goto out; |
1da177e4 LT |
2424 | c = policydb.ocontexts[OCON_NODE6]; |
2425 | while (c) { | |
2426 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2427 | c->u.node6.mask)) | |
2428 | break; | |
2429 | c = c->next; | |
2430 | } | |
2431 | break; | |
2432 | ||
2433 | default: | |
4b02b524 | 2434 | rc = 0; |
1da177e4 LT |
2435 | *out_sid = SECINITSID_NODE; |
2436 | goto out; | |
2437 | } | |
2438 | ||
2439 | if (c) { | |
2440 | if (!c->sid[0]) { | |
2441 | rc = sidtab_context_to_sid(&sidtab, | |
2442 | &c->context[0], | |
2443 | &c->sid[0]); | |
2444 | if (rc) | |
2445 | goto out; | |
2446 | } | |
2447 | *out_sid = c->sid[0]; | |
2448 | } else { | |
2449 | *out_sid = SECINITSID_NODE; | |
2450 | } | |
2451 | ||
4b02b524 | 2452 | rc = 0; |
1da177e4 | 2453 | out: |
0804d113 | 2454 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2455 | return rc; |
2456 | } | |
2457 | ||
2458 | #define SIDS_NEL 25 | |
2459 | ||
2460 | /** | |
2461 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2462 | * @fromsid: starting SID | |
2463 | * @username: username | |
2464 | * @sids: array of reachable SIDs for user | |
2465 | * @nel: number of elements in @sids | |
2466 | * | |
2467 | * Generate the set of SIDs for legal security contexts | |
2468 | * for a given user that can be reached by @fromsid. | |
2469 | * Set *@sids to point to a dynamically allocated | |
2470 | * array containing the set of SIDs. Set *@nel to the | |
2471 | * number of elements in the array. | |
2472 | */ | |
2473 | ||
2474 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2475 | char *username, |
1da177e4 LT |
2476 | u32 **sids, |
2477 | u32 *nel) | |
2478 | { | |
2479 | struct context *fromcon, usercon; | |
2c3c05db | 2480 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2481 | u32 mynel = 0, maxnel = SIDS_NEL; |
2482 | struct user_datum *user; | |
2483 | struct role_datum *role; | |
782ebb99 | 2484 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2485 | int rc = 0, i, j; |
2486 | ||
2c3c05db SS |
2487 | *sids = NULL; |
2488 | *nel = 0; | |
2489 | ||
2490 | if (!ss_initialized) | |
1da177e4 | 2491 | goto out; |
1da177e4 | 2492 | |
0804d113 | 2493 | read_lock(&policy_rwlock); |
1da177e4 | 2494 | |
12b29f34 SS |
2495 | context_init(&usercon); |
2496 | ||
4b02b524 | 2497 | rc = -EINVAL; |
1da177e4 | 2498 | fromcon = sidtab_search(&sidtab, fromsid); |
4b02b524 | 2499 | if (!fromcon) |
1da177e4 | 2500 | goto out_unlock; |
1da177e4 | 2501 | |
4b02b524 | 2502 | rc = -EINVAL; |
1da177e4 | 2503 | user = hashtab_search(policydb.p_users.table, username); |
4b02b524 | 2504 | if (!user) |
1da177e4 | 2505 | goto out_unlock; |
4b02b524 | 2506 | |
1da177e4 LT |
2507 | usercon.user = user->value; |
2508 | ||
4b02b524 | 2509 | rc = -ENOMEM; |
89d155ef | 2510 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2511 | if (!mysids) |
1da177e4 | 2512 | goto out_unlock; |
1da177e4 | 2513 | |
9fe79ad1 | 2514 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2515 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2516 | usercon.role = i + 1; |
9fe79ad1 | 2517 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2518 | usercon.type = j + 1; |
1da177e4 LT |
2519 | |
2520 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2521 | continue; | |
2522 | ||
1da177e4 | 2523 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2524 | if (rc) |
1da177e4 | 2525 | goto out_unlock; |
1da177e4 LT |
2526 | if (mynel < maxnel) { |
2527 | mysids[mynel++] = sid; | |
2528 | } else { | |
4b02b524 | 2529 | rc = -ENOMEM; |
1da177e4 | 2530 | maxnel += SIDS_NEL; |
89d155ef | 2531 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2532 | if (!mysids2) |
1da177e4 | 2533 | goto out_unlock; |
1da177e4 LT |
2534 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2535 | kfree(mysids); | |
2536 | mysids = mysids2; | |
2537 | mysids[mynel++] = sid; | |
2538 | } | |
2539 | } | |
2540 | } | |
4b02b524 | 2541 | rc = 0; |
1da177e4 | 2542 | out_unlock: |
0804d113 | 2543 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2544 | if (rc || !mynel) { |
2545 | kfree(mysids); | |
2546 | goto out; | |
2547 | } | |
2548 | ||
4b02b524 | 2549 | rc = -ENOMEM; |
2c3c05db SS |
2550 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2551 | if (!mysids2) { | |
2c3c05db SS |
2552 | kfree(mysids); |
2553 | goto out; | |
2554 | } | |
2555 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2556 | struct av_decision dummy_avd; |
2c3c05db | 2557 | rc = avc_has_perm_noaudit(fromsid, mysids[i], |
c6d3aaa4 | 2558 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2559 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2560 | &dummy_avd); |
2c3c05db SS |
2561 | if (!rc) |
2562 | mysids2[j++] = mysids[i]; | |
2563 | cond_resched(); | |
2564 | } | |
2565 | rc = 0; | |
2566 | kfree(mysids); | |
2567 | *sids = mysids2; | |
2568 | *nel = j; | |
1da177e4 LT |
2569 | out: |
2570 | return rc; | |
2571 | } | |
2572 | ||
2573 | /** | |
f31e7994 | 2574 | * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem |
1da177e4 LT |
2575 | * @fstype: filesystem type |
2576 | * @path: path from root of mount | |
2577 | * @sclass: file security class | |
2578 | * @sid: SID for path | |
2579 | * | |
2580 | * Obtain a SID to use for a file in a filesystem that | |
2581 | * cannot support xattr or use a fixed labeling behavior like | |
2582 | * transition SIDs or task SIDs. | |
f31e7994 WL |
2583 | * |
2584 | * The caller must acquire the policy_rwlock before calling this function. | |
1da177e4 | 2585 | */ |
f31e7994 WL |
2586 | static inline int __security_genfs_sid(const char *fstype, |
2587 | char *path, | |
2588 | u16 orig_sclass, | |
2589 | u32 *sid) | |
1da177e4 LT |
2590 | { |
2591 | int len; | |
c6d3aaa4 | 2592 | u16 sclass; |
1da177e4 LT |
2593 | struct genfs *genfs; |
2594 | struct ocontext *c; | |
4b02b524 | 2595 | int rc, cmp = 0; |
1da177e4 | 2596 | |
b1aa5301 SS |
2597 | while (path[0] == '/' && path[1] == '/') |
2598 | path++; | |
2599 | ||
c6d3aaa4 | 2600 | sclass = unmap_class(orig_sclass); |
4b02b524 | 2601 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2602 | |
1da177e4 LT |
2603 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2604 | cmp = strcmp(fstype, genfs->fstype); | |
2605 | if (cmp <= 0) | |
2606 | break; | |
2607 | } | |
2608 | ||
4b02b524 EP |
2609 | rc = -ENOENT; |
2610 | if (!genfs || cmp) | |
1da177e4 | 2611 | goto out; |
1da177e4 LT |
2612 | |
2613 | for (c = genfs->head; c; c = c->next) { | |
2614 | len = strlen(c->u.name); | |
2615 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2616 | (strncmp(c->u.name, path, len) == 0)) | |
2617 | break; | |
2618 | } | |
2619 | ||
4b02b524 EP |
2620 | rc = -ENOENT; |
2621 | if (!c) | |
1da177e4 | 2622 | goto out; |
1da177e4 LT |
2623 | |
2624 | if (!c->sid[0]) { | |
4b02b524 | 2625 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2626 | if (rc) |
2627 | goto out; | |
2628 | } | |
2629 | ||
2630 | *sid = c->sid[0]; | |
4b02b524 | 2631 | rc = 0; |
1da177e4 | 2632 | out: |
1da177e4 LT |
2633 | return rc; |
2634 | } | |
2635 | ||
f31e7994 WL |
2636 | /** |
2637 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2638 | * @fstype: filesystem type | |
2639 | * @path: path from root of mount | |
2640 | * @sclass: file security class | |
2641 | * @sid: SID for path | |
2642 | * | |
2643 | * Acquire policy_rwlock before calling __security_genfs_sid() and release | |
2644 | * it afterward. | |
2645 | */ | |
2646 | int security_genfs_sid(const char *fstype, | |
2647 | char *path, | |
2648 | u16 orig_sclass, | |
2649 | u32 *sid) | |
2650 | { | |
2651 | int retval; | |
2652 | ||
2653 | read_lock(&policy_rwlock); | |
2654 | retval = __security_genfs_sid(fstype, path, orig_sclass, sid); | |
2655 | read_unlock(&policy_rwlock); | |
2656 | return retval; | |
2657 | } | |
2658 | ||
1da177e4 LT |
2659 | /** |
2660 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
a64c54cf | 2661 | * @sb: superblock in question |
1da177e4 | 2662 | */ |
a64c54cf | 2663 | int security_fs_use(struct super_block *sb) |
1da177e4 LT |
2664 | { |
2665 | int rc = 0; | |
2666 | struct ocontext *c; | |
a64c54cf EP |
2667 | struct superblock_security_struct *sbsec = sb->s_security; |
2668 | const char *fstype = sb->s_type->name; | |
1da177e4 | 2669 | |
0804d113 | 2670 | read_lock(&policy_rwlock); |
1da177e4 | 2671 | |
4d546f81 PM |
2672 | c = policydb.ocontexts[OCON_FSUSE]; |
2673 | while (c) { | |
2674 | if (strcmp(fstype, c->u.name) == 0) | |
1da177e4 | 2675 | break; |
4d546f81 | 2676 | c = c->next; |
1da177e4 LT |
2677 | } |
2678 | ||
2679 | if (c) { | |
a64c54cf | 2680 | sbsec->behavior = c->v.behavior; |
1da177e4 | 2681 | if (!c->sid[0]) { |
4b02b524 | 2682 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], |
1da177e4 LT |
2683 | &c->sid[0]); |
2684 | if (rc) | |
2685 | goto out; | |
2686 | } | |
a64c54cf | 2687 | sbsec->sid = c->sid[0]; |
1da177e4 | 2688 | } else { |
f31e7994 WL |
2689 | rc = __security_genfs_sid(fstype, "/", SECCLASS_DIR, |
2690 | &sbsec->sid); | |
089be43e | 2691 | if (rc) { |
a64c54cf | 2692 | sbsec->behavior = SECURITY_FS_USE_NONE; |
089be43e JM |
2693 | rc = 0; |
2694 | } else { | |
a64c54cf | 2695 | sbsec->behavior = SECURITY_FS_USE_GENFS; |
089be43e | 2696 | } |
1da177e4 LT |
2697 | } |
2698 | ||
2699 | out: | |
0804d113 | 2700 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2701 | return rc; |
2702 | } | |
2703 | ||
2704 | int security_get_bools(int *len, char ***names, int **values) | |
2705 | { | |
4b02b524 | 2706 | int i, rc; |
1da177e4 | 2707 | |
0804d113 | 2708 | read_lock(&policy_rwlock); |
1da177e4 LT |
2709 | *names = NULL; |
2710 | *values = NULL; | |
2711 | ||
4b02b524 | 2712 | rc = 0; |
1da177e4 | 2713 | *len = policydb.p_bools.nprim; |
4b02b524 | 2714 | if (!*len) |
1da177e4 | 2715 | goto out; |
1da177e4 | 2716 | |
4b02b524 EP |
2717 | rc = -ENOMEM; |
2718 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2719 | if (!*names) |
2720 | goto err; | |
1da177e4 | 2721 | |
4b02b524 EP |
2722 | rc = -ENOMEM; |
2723 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2724 | if (!*values) |
2725 | goto err; | |
2726 | ||
2727 | for (i = 0; i < *len; i++) { | |
1da177e4 | 2728 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
4b02b524 EP |
2729 | |
2730 | rc = -ENOMEM; | |
21b76f19 | 2731 | (*names)[i] = kstrdup(sym_name(&policydb, SYM_BOOLS, i), GFP_ATOMIC); |
1da177e4 LT |
2732 | if (!(*names)[i]) |
2733 | goto err; | |
1da177e4 LT |
2734 | } |
2735 | rc = 0; | |
2736 | out: | |
0804d113 | 2737 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2738 | return rc; |
2739 | err: | |
2740 | if (*names) { | |
2741 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2742 | kfree((*names)[i]); |
1da177e4 | 2743 | } |
9a5f04bf | 2744 | kfree(*values); |
1da177e4 LT |
2745 | goto out; |
2746 | } | |
2747 | ||
2748 | ||
2749 | int security_set_bools(int len, int *values) | |
2750 | { | |
4b02b524 | 2751 | int i, rc; |
1da177e4 LT |
2752 | int lenp, seqno = 0; |
2753 | struct cond_node *cur; | |
2754 | ||
0804d113 | 2755 | write_lock_irq(&policy_rwlock); |
1da177e4 | 2756 | |
4b02b524 | 2757 | rc = -EFAULT; |
1da177e4 | 2758 | lenp = policydb.p_bools.nprim; |
4b02b524 | 2759 | if (len != lenp) |
1da177e4 | 2760 | goto out; |
1da177e4 | 2761 | |
1da177e4 | 2762 | for (i = 0; i < len; i++) { |
af601e46 SG |
2763 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2764 | audit_log(current->audit_context, GFP_ATOMIC, | |
2765 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2766 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
ac76c05b | 2767 | sym_name(&policydb, SYM_BOOLS, i), |
af601e46 SG |
2768 | !!values[i], |
2769 | policydb.bool_val_to_struct[i]->state, | |
581abc09 | 2770 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2771 | audit_get_sessionid(current)); |
af601e46 | 2772 | } |
5d55a345 | 2773 | if (values[i]) |
1da177e4 | 2774 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2775 | else |
1da177e4 | 2776 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2777 | } |
1da177e4 | 2778 | |
dbc74c65 | 2779 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2780 | rc = evaluate_cond_node(&policydb, cur); |
2781 | if (rc) | |
2782 | goto out; | |
2783 | } | |
2784 | ||
2785 | seqno = ++latest_granting; | |
4b02b524 | 2786 | rc = 0; |
1da177e4 | 2787 | out: |
0804d113 | 2788 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2789 | if (!rc) { |
2790 | avc_ss_reset(seqno); | |
2791 | selnl_notify_policyload(seqno); | |
11904167 | 2792 | selinux_status_update_policyload(seqno); |
342a0cff | 2793 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2794 | } |
2795 | return rc; | |
2796 | } | |
2797 | ||
0fd71a62 | 2798 | int security_get_bool_value(int index) |
1da177e4 | 2799 | { |
4b02b524 | 2800 | int rc; |
1da177e4 LT |
2801 | int len; |
2802 | ||
0804d113 | 2803 | read_lock(&policy_rwlock); |
1da177e4 | 2804 | |
4b02b524 | 2805 | rc = -EFAULT; |
1da177e4 | 2806 | len = policydb.p_bools.nprim; |
0fd71a62 | 2807 | if (index >= len) |
1da177e4 | 2808 | goto out; |
1da177e4 | 2809 | |
0fd71a62 | 2810 | rc = policydb.bool_val_to_struct[index]->state; |
1da177e4 | 2811 | out: |
0804d113 | 2812 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2813 | return rc; |
2814 | } | |
376bd9cb | 2815 | |
e900a7d9 SS |
2816 | static int security_preserve_bools(struct policydb *p) |
2817 | { | |
2818 | int rc, nbools = 0, *bvalues = NULL, i; | |
2819 | char **bnames = NULL; | |
2820 | struct cond_bool_datum *booldatum; | |
2821 | struct cond_node *cur; | |
2822 | ||
2823 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2824 | if (rc) | |
2825 | goto out; | |
2826 | for (i = 0; i < nbools; i++) { | |
2827 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2828 | if (booldatum) | |
2829 | booldatum->state = bvalues[i]; | |
2830 | } | |
dbc74c65 | 2831 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2832 | rc = evaluate_cond_node(p, cur); |
2833 | if (rc) | |
2834 | goto out; | |
2835 | } | |
2836 | ||
2837 | out: | |
2838 | if (bnames) { | |
2839 | for (i = 0; i < nbools; i++) | |
2840 | kfree(bnames[i]); | |
2841 | } | |
2842 | kfree(bnames); | |
2843 | kfree(bvalues); | |
2844 | return rc; | |
2845 | } | |
2846 | ||
08554d6b VY |
2847 | /* |
2848 | * security_sid_mls_copy() - computes a new sid based on the given | |
2849 | * sid and the mls portion of mls_sid. | |
2850 | */ | |
2851 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2852 | { | |
2853 | struct context *context1; | |
2854 | struct context *context2; | |
2855 | struct context newcon; | |
2856 | char *s; | |
2857 | u32 len; | |
4b02b524 | 2858 | int rc; |
08554d6b | 2859 | |
4b02b524 | 2860 | rc = 0; |
0719aaf5 | 2861 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2862 | *new_sid = sid; |
2863 | goto out; | |
2864 | } | |
2865 | ||
2866 | context_init(&newcon); | |
2867 | ||
0804d113 | 2868 | read_lock(&policy_rwlock); |
4b02b524 EP |
2869 | |
2870 | rc = -EINVAL; | |
08554d6b VY |
2871 | context1 = sidtab_search(&sidtab, sid); |
2872 | if (!context1) { | |
744ba35e EP |
2873 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2874 | __func__, sid); | |
08554d6b VY |
2875 | goto out_unlock; |
2876 | } | |
2877 | ||
4b02b524 | 2878 | rc = -EINVAL; |
08554d6b VY |
2879 | context2 = sidtab_search(&sidtab, mls_sid); |
2880 | if (!context2) { | |
744ba35e EP |
2881 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2882 | __func__, mls_sid); | |
08554d6b VY |
2883 | goto out_unlock; |
2884 | } | |
2885 | ||
2886 | newcon.user = context1->user; | |
2887 | newcon.role = context1->role; | |
2888 | newcon.type = context1->type; | |
0efc61ea | 2889 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2890 | if (rc) |
2891 | goto out_unlock; | |
2892 | ||
08554d6b VY |
2893 | /* Check the validity of the new context. */ |
2894 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2895 | rc = convert_context_handle_invalid_context(&newcon); | |
4b02b524 EP |
2896 | if (rc) { |
2897 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
4093a844 RGB |
2898 | audit_log(current->audit_context, |
2899 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2900 | "op=security_sid_mls_copy " | |
2901 | "invalid_context=%s", s); | |
4b02b524 EP |
2902 | kfree(s); |
2903 | } | |
2904 | goto out_unlock; | |
2905 | } | |
08554d6b VY |
2906 | } |
2907 | ||
2908 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
08554d6b | 2909 | out_unlock: |
0804d113 | 2910 | read_unlock(&policy_rwlock); |
08554d6b VY |
2911 | context_destroy(&newcon); |
2912 | out: | |
2913 | return rc; | |
2914 | } | |
2915 | ||
220deb96 PM |
2916 | /** |
2917 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2918 | * @nlbl_sid: NetLabel SID | |
2919 | * @nlbl_type: NetLabel labeling protocol type | |
2920 | * @xfrm_sid: XFRM SID | |
2921 | * | |
2922 | * Description: | |
2923 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2924 | * resolved into a single SID it is returned via @peer_sid and the function | |
2925 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2926 | * returns a negative value. A table summarizing the behavior is below: | |
2927 | * | |
2928 | * | function return | @sid | |
2929 | * ------------------------------+-----------------+----------------- | |
2930 | * no peer labels | 0 | SECSID_NULL | |
2931 | * single peer label | 0 | <peer_label> | |
2932 | * multiple, consistent labels | 0 | <peer_label> | |
2933 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2934 | * | |
2935 | */ | |
2936 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2937 | u32 xfrm_sid, | |
2938 | u32 *peer_sid) | |
2939 | { | |
2940 | int rc; | |
2941 | struct context *nlbl_ctx; | |
2942 | struct context *xfrm_ctx; | |
2943 | ||
4b02b524 EP |
2944 | *peer_sid = SECSID_NULL; |
2945 | ||
220deb96 PM |
2946 | /* handle the common (which also happens to be the set of easy) cases |
2947 | * right away, these two if statements catch everything involving a | |
2948 | * single or absent peer SID/label */ | |
2949 | if (xfrm_sid == SECSID_NULL) { | |
2950 | *peer_sid = nlbl_sid; | |
2951 | return 0; | |
2952 | } | |
2953 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2954 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2955 | * is present */ | |
2956 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2957 | *peer_sid = xfrm_sid; | |
2958 | return 0; | |
2959 | } | |
2960 | ||
2961 | /* we don't need to check ss_initialized here since the only way both | |
2962 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2963 | * security server was initialized and ss_initialized was true */ | |
4b02b524 | 2964 | if (!policydb.mls_enabled) |
220deb96 | 2965 | return 0; |
220deb96 | 2966 | |
0804d113 | 2967 | read_lock(&policy_rwlock); |
220deb96 | 2968 | |
4b02b524 | 2969 | rc = -EINVAL; |
220deb96 PM |
2970 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); |
2971 | if (!nlbl_ctx) { | |
744ba35e EP |
2972 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2973 | __func__, nlbl_sid); | |
4b02b524 | 2974 | goto out; |
220deb96 | 2975 | } |
4b02b524 | 2976 | rc = -EINVAL; |
220deb96 PM |
2977 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); |
2978 | if (!xfrm_ctx) { | |
744ba35e EP |
2979 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2980 | __func__, xfrm_sid); | |
4b02b524 | 2981 | goto out; |
220deb96 PM |
2982 | } |
2983 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
2984 | if (rc) |
2985 | goto out; | |
220deb96 | 2986 | |
4b02b524 EP |
2987 | /* at present NetLabel SIDs/labels really only carry MLS |
2988 | * information so if the MLS portion of the NetLabel SID | |
2989 | * matches the MLS portion of the labeled XFRM SID/label | |
2990 | * then pass along the XFRM SID as it is the most | |
2991 | * expressive */ | |
2992 | *peer_sid = xfrm_sid; | |
2993 | out: | |
0804d113 | 2994 | read_unlock(&policy_rwlock); |
220deb96 PM |
2995 | return rc; |
2996 | } | |
2997 | ||
55fcf09b CP |
2998 | static int get_classes_callback(void *k, void *d, void *args) |
2999 | { | |
3000 | struct class_datum *datum = d; | |
3001 | char *name = k, **classes = args; | |
3002 | int value = datum->value - 1; | |
3003 | ||
3004 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
3005 | if (!classes[value]) | |
3006 | return -ENOMEM; | |
3007 | ||
3008 | return 0; | |
3009 | } | |
3010 | ||
3011 | int security_get_classes(char ***classes, int *nclasses) | |
3012 | { | |
4b02b524 | 3013 | int rc; |
55fcf09b | 3014 | |
0804d113 | 3015 | read_lock(&policy_rwlock); |
55fcf09b | 3016 | |
4b02b524 | 3017 | rc = -ENOMEM; |
55fcf09b | 3018 | *nclasses = policydb.p_classes.nprim; |
9f59f90b | 3019 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
3020 | if (!*classes) |
3021 | goto out; | |
3022 | ||
3023 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
3024 | *classes); | |
4b02b524 | 3025 | if (rc) { |
55fcf09b CP |
3026 | int i; |
3027 | for (i = 0; i < *nclasses; i++) | |
3028 | kfree((*classes)[i]); | |
3029 | kfree(*classes); | |
3030 | } | |
3031 | ||
3032 | out: | |
0804d113 | 3033 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3034 | return rc; |
3035 | } | |
3036 | ||
3037 | static int get_permissions_callback(void *k, void *d, void *args) | |
3038 | { | |
3039 | struct perm_datum *datum = d; | |
3040 | char *name = k, **perms = args; | |
3041 | int value = datum->value - 1; | |
3042 | ||
3043 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
3044 | if (!perms[value]) | |
3045 | return -ENOMEM; | |
3046 | ||
3047 | return 0; | |
3048 | } | |
3049 | ||
3050 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
3051 | { | |
4b02b524 | 3052 | int rc, i; |
55fcf09b CP |
3053 | struct class_datum *match; |
3054 | ||
0804d113 | 3055 | read_lock(&policy_rwlock); |
55fcf09b | 3056 | |
4b02b524 | 3057 | rc = -EINVAL; |
55fcf09b CP |
3058 | match = hashtab_search(policydb.p_classes.table, class); |
3059 | if (!match) { | |
744ba35e | 3060 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 3061 | __func__, class); |
55fcf09b CP |
3062 | goto out; |
3063 | } | |
3064 | ||
4b02b524 | 3065 | rc = -ENOMEM; |
55fcf09b | 3066 | *nperms = match->permissions.nprim; |
9f59f90b | 3067 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
3068 | if (!*perms) |
3069 | goto out; | |
3070 | ||
3071 | if (match->comdatum) { | |
3072 | rc = hashtab_map(match->comdatum->permissions.table, | |
3073 | get_permissions_callback, *perms); | |
4b02b524 | 3074 | if (rc) |
55fcf09b CP |
3075 | goto err; |
3076 | } | |
3077 | ||
3078 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
3079 | *perms); | |
4b02b524 | 3080 | if (rc) |
55fcf09b CP |
3081 | goto err; |
3082 | ||
3083 | out: | |
0804d113 | 3084 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3085 | return rc; |
3086 | ||
3087 | err: | |
0804d113 | 3088 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3089 | for (i = 0; i < *nperms; i++) |
3090 | kfree((*perms)[i]); | |
3091 | kfree(*perms); | |
3092 | return rc; | |
3093 | } | |
3094 | ||
3f12070e EP |
3095 | int security_get_reject_unknown(void) |
3096 | { | |
3097 | return policydb.reject_unknown; | |
3098 | } | |
3099 | ||
3100 | int security_get_allow_unknown(void) | |
3101 | { | |
3102 | return policydb.allow_unknown; | |
3103 | } | |
3104 | ||
3bb56b25 PM |
3105 | /** |
3106 | * security_policycap_supported - Check for a specific policy capability | |
3107 | * @req_cap: capability | |
3108 | * | |
3109 | * Description: | |
3110 | * This function queries the currently loaded policy to see if it supports the | |
3111 | * capability specified by @req_cap. Returns true (1) if the capability is | |
3112 | * supported, false (0) if it isn't supported. | |
3113 | * | |
3114 | */ | |
3115 | int security_policycap_supported(unsigned int req_cap) | |
3116 | { | |
3117 | int rc; | |
3118 | ||
0804d113 | 3119 | read_lock(&policy_rwlock); |
3bb56b25 | 3120 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 3121 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
3122 | |
3123 | return rc; | |
3124 | } | |
3125 | ||
376bd9cb DG |
3126 | struct selinux_audit_rule { |
3127 | u32 au_seqno; | |
3128 | struct context au_ctxt; | |
3129 | }; | |
3130 | ||
9d57a7f9 | 3131 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 3132 | { |
9d57a7f9 AD |
3133 | struct selinux_audit_rule *rule = vrule; |
3134 | ||
376bd9cb DG |
3135 | if (rule) { |
3136 | context_destroy(&rule->au_ctxt); | |
3137 | kfree(rule); | |
3138 | } | |
3139 | } | |
3140 | ||
9d57a7f9 | 3141 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
3142 | { |
3143 | struct selinux_audit_rule *tmprule; | |
3144 | struct role_datum *roledatum; | |
3145 | struct type_datum *typedatum; | |
3146 | struct user_datum *userdatum; | |
9d57a7f9 | 3147 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
3148 | int rc = 0; |
3149 | ||
3150 | *rule = NULL; | |
3151 | ||
3152 | if (!ss_initialized) | |
3ad40d64 | 3153 | return -EOPNOTSUPP; |
376bd9cb DG |
3154 | |
3155 | switch (field) { | |
3a6b9f85 DG |
3156 | case AUDIT_SUBJ_USER: |
3157 | case AUDIT_SUBJ_ROLE: | |
3158 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
3159 | case AUDIT_OBJ_USER: |
3160 | case AUDIT_OBJ_ROLE: | |
3161 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 3162 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 3163 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
3164 | return -EINVAL; |
3165 | break; | |
3a6b9f85 DG |
3166 | case AUDIT_SUBJ_SEN: |
3167 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3168 | case AUDIT_OBJ_LEV_LOW: |
3169 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 3170 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
3171 | if (strchr(rulestr, '-')) |
3172 | return -EINVAL; | |
3173 | break; | |
3174 | default: | |
3175 | /* only the above fields are valid */ | |
3176 | return -EINVAL; | |
3177 | } | |
3178 | ||
3179 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
3180 | if (!tmprule) | |
3181 | return -ENOMEM; | |
3182 | ||
3183 | context_init(&tmprule->au_ctxt); | |
3184 | ||
0804d113 | 3185 | read_lock(&policy_rwlock); |
376bd9cb DG |
3186 | |
3187 | tmprule->au_seqno = latest_granting; | |
3188 | ||
3189 | switch (field) { | |
3a6b9f85 | 3190 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3191 | case AUDIT_OBJ_USER: |
4b02b524 | 3192 | rc = -EINVAL; |
376bd9cb DG |
3193 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
3194 | if (!userdatum) | |
4b02b524 EP |
3195 | goto out; |
3196 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 3197 | break; |
3a6b9f85 | 3198 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3199 | case AUDIT_OBJ_ROLE: |
4b02b524 | 3200 | rc = -EINVAL; |
376bd9cb DG |
3201 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
3202 | if (!roledatum) | |
4b02b524 EP |
3203 | goto out; |
3204 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 3205 | break; |
3a6b9f85 | 3206 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3207 | case AUDIT_OBJ_TYPE: |
4b02b524 | 3208 | rc = -EINVAL; |
376bd9cb DG |
3209 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
3210 | if (!typedatum) | |
4b02b524 EP |
3211 | goto out; |
3212 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 3213 | break; |
3a6b9f85 DG |
3214 | case AUDIT_SUBJ_SEN: |
3215 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3216 | case AUDIT_OBJ_LEV_LOW: |
3217 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb | 3218 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
4b02b524 EP |
3219 | if (rc) |
3220 | goto out; | |
376bd9cb DG |
3221 | break; |
3222 | } | |
4b02b524 EP |
3223 | rc = 0; |
3224 | out: | |
0804d113 | 3225 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3226 | |
3227 | if (rc) { | |
3228 | selinux_audit_rule_free(tmprule); | |
3229 | tmprule = NULL; | |
3230 | } | |
3231 | ||
3232 | *rule = tmprule; | |
3233 | ||
3234 | return rc; | |
3235 | } | |
3236 | ||
9d57a7f9 AD |
3237 | /* Check to see if the rule contains any selinux fields */ |
3238 | int selinux_audit_rule_known(struct audit_krule *rule) | |
3239 | { | |
3240 | int i; | |
3241 | ||
3242 | for (i = 0; i < rule->field_count; i++) { | |
3243 | struct audit_field *f = &rule->fields[i]; | |
3244 | switch (f->type) { | |
3245 | case AUDIT_SUBJ_USER: | |
3246 | case AUDIT_SUBJ_ROLE: | |
3247 | case AUDIT_SUBJ_TYPE: | |
3248 | case AUDIT_SUBJ_SEN: | |
3249 | case AUDIT_SUBJ_CLR: | |
3250 | case AUDIT_OBJ_USER: | |
3251 | case AUDIT_OBJ_ROLE: | |
3252 | case AUDIT_OBJ_TYPE: | |
3253 | case AUDIT_OBJ_LEV_LOW: | |
3254 | case AUDIT_OBJ_LEV_HIGH: | |
3255 | return 1; | |
3256 | } | |
3257 | } | |
3258 | ||
3259 | return 0; | |
3260 | } | |
3261 | ||
3262 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 3263 | struct audit_context *actx) |
376bd9cb DG |
3264 | { |
3265 | struct context *ctxt; | |
3266 | struct mls_level *level; | |
9d57a7f9 | 3267 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
3268 | int match = 0; |
3269 | ||
9ad42a79 RGB |
3270 | if (unlikely(!rule)) { |
3271 | WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); | |
376bd9cb DG |
3272 | return -ENOENT; |
3273 | } | |
3274 | ||
0804d113 | 3275 | read_lock(&policy_rwlock); |
376bd9cb DG |
3276 | |
3277 | if (rule->au_seqno < latest_granting) { | |
376bd9cb DG |
3278 | match = -ESTALE; |
3279 | goto out; | |
3280 | } | |
3281 | ||
9a2f44f0 | 3282 | ctxt = sidtab_search(&sidtab, sid); |
9ad42a79 RGB |
3283 | if (unlikely(!ctxt)) { |
3284 | WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", | |
5d55a345 | 3285 | sid); |
376bd9cb DG |
3286 | match = -ENOENT; |
3287 | goto out; | |
3288 | } | |
3289 | ||
3290 | /* a field/op pair that is not caught here will simply fall through | |
3291 | without a match */ | |
3292 | switch (field) { | |
3a6b9f85 | 3293 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3294 | case AUDIT_OBJ_USER: |
376bd9cb | 3295 | switch (op) { |
5af75d8d | 3296 | case Audit_equal: |
376bd9cb DG |
3297 | match = (ctxt->user == rule->au_ctxt.user); |
3298 | break; | |
5af75d8d | 3299 | case Audit_not_equal: |
376bd9cb DG |
3300 | match = (ctxt->user != rule->au_ctxt.user); |
3301 | break; | |
3302 | } | |
3303 | break; | |
3a6b9f85 | 3304 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3305 | case AUDIT_OBJ_ROLE: |
376bd9cb | 3306 | switch (op) { |
5af75d8d | 3307 | case Audit_equal: |
376bd9cb DG |
3308 | match = (ctxt->role == rule->au_ctxt.role); |
3309 | break; | |
5af75d8d | 3310 | case Audit_not_equal: |
376bd9cb DG |
3311 | match = (ctxt->role != rule->au_ctxt.role); |
3312 | break; | |
3313 | } | |
3314 | break; | |
3a6b9f85 | 3315 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3316 | case AUDIT_OBJ_TYPE: |
376bd9cb | 3317 | switch (op) { |
5af75d8d | 3318 | case Audit_equal: |
376bd9cb DG |
3319 | match = (ctxt->type == rule->au_ctxt.type); |
3320 | break; | |
5af75d8d | 3321 | case Audit_not_equal: |
376bd9cb DG |
3322 | match = (ctxt->type != rule->au_ctxt.type); |
3323 | break; | |
3324 | } | |
3325 | break; | |
3a6b9f85 DG |
3326 | case AUDIT_SUBJ_SEN: |
3327 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3328 | case AUDIT_OBJ_LEV_LOW: |
3329 | case AUDIT_OBJ_LEV_HIGH: | |
3330 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3331 | field == AUDIT_OBJ_LEV_LOW) ? |
3332 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3333 | switch (op) { |
5af75d8d | 3334 | case Audit_equal: |
376bd9cb | 3335 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3336 | level); |
376bd9cb | 3337 | break; |
5af75d8d | 3338 | case Audit_not_equal: |
376bd9cb | 3339 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3340 | level); |
376bd9cb | 3341 | break; |
5af75d8d | 3342 | case Audit_lt: |
376bd9cb | 3343 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3344 | level) && |
3345 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3346 | level)); | |
376bd9cb | 3347 | break; |
5af75d8d | 3348 | case Audit_le: |
376bd9cb | 3349 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3350 | level); |
376bd9cb | 3351 | break; |
5af75d8d | 3352 | case Audit_gt: |
376bd9cb | 3353 | match = (mls_level_dom(level, |
5d55a345 EP |
3354 | &rule->au_ctxt.range.level[0]) && |
3355 | !mls_level_eq(level, | |
3356 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3357 | break; |
5af75d8d | 3358 | case Audit_ge: |
376bd9cb | 3359 | match = mls_level_dom(level, |
5d55a345 | 3360 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3361 | break; |
3362 | } | |
3363 | } | |
3364 | ||
3365 | out: | |
0804d113 | 3366 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3367 | return match; |
3368 | } | |
3369 | ||
9d57a7f9 | 3370 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3371 | |
562c99f2 | 3372 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3373 | { |
3374 | int err = 0; | |
3375 | ||
3376 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3377 | err = aurule_callback(); | |
3378 | return err; | |
3379 | } | |
3380 | ||
3381 | static int __init aurule_init(void) | |
3382 | { | |
3383 | int err; | |
3384 | ||
562c99f2 | 3385 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3386 | if (err) |
3387 | panic("avc_add_callback() failed, error %d\n", err); | |
3388 | ||
3389 | return err; | |
3390 | } | |
3391 | __initcall(aurule_init); | |
3392 | ||
7420ed23 | 3393 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3394 | /** |
5778eabd PM |
3395 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3396 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3397 | * @sid: the SELinux SID |
7420ed23 VY |
3398 | * |
3399 | * Description: | |
3400 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3401 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3402 | * already been initialized. | |
7420ed23 VY |
3403 | * |
3404 | */ | |
5778eabd | 3405 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3406 | u32 sid) |
7420ed23 | 3407 | { |
5dbe1eb0 | 3408 | u32 *sid_cache; |
7420ed23 | 3409 | |
5dbe1eb0 PM |
3410 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3411 | if (sid_cache == NULL) | |
5778eabd | 3412 | return; |
5dbe1eb0 PM |
3413 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3414 | if (secattr->cache == NULL) { | |
3415 | kfree(sid_cache); | |
5778eabd | 3416 | return; |
0ec8abd7 | 3417 | } |
7420ed23 | 3418 | |
5dbe1eb0 PM |
3419 | *sid_cache = sid; |
3420 | secattr->cache->free = kfree; | |
3421 | secattr->cache->data = sid_cache; | |
5778eabd | 3422 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3423 | } |
3424 | ||
3425 | /** | |
5778eabd | 3426 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3427 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3428 | * @sid: the SELinux SID |
3429 | * | |
3430 | * Description: | |
5778eabd | 3431 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3432 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3433 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3434 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3435 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3436 | * conversion for future lookups. Returns zero on success, negative values on | |
3437 | * failure. | |
7420ed23 VY |
3438 | * |
3439 | */ | |
5778eabd | 3440 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3441 | u32 *sid) |
7420ed23 | 3442 | { |
7ae9f23c | 3443 | int rc; |
7420ed23 VY |
3444 | struct context *ctx; |
3445 | struct context ctx_new; | |
5778eabd PM |
3446 | |
3447 | if (!ss_initialized) { | |
3448 | *sid = SECSID_NULL; | |
3449 | return 0; | |
3450 | } | |
7420ed23 | 3451 | |
0804d113 | 3452 | read_lock(&policy_rwlock); |
7420ed23 | 3453 | |
7ae9f23c | 3454 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3455 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3456 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3457 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3458 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3459 | rc = -EIDRM; | |
5dbe1eb0 | 3460 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 | 3461 | if (ctx == NULL) |
7ae9f23c | 3462 | goto out; |
7420ed23 | 3463 | |
81990fbd | 3464 | context_init(&ctx_new); |
7420ed23 VY |
3465 | ctx_new.user = ctx->user; |
3466 | ctx_new.role = ctx->role; | |
3467 | ctx_new.type = ctx->type; | |
02752760 | 3468 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3469 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
da8026fa | 3470 | rc = mls_import_netlbl_cat(&ctx_new, secattr); |
7ae9f23c EP |
3471 | if (rc) |
3472 | goto out; | |
7420ed23 | 3473 | } |
7ae9f23c EP |
3474 | rc = -EIDRM; |
3475 | if (!mls_context_isvalid(&policydb, &ctx_new)) | |
3476 | goto out_free; | |
7420ed23 VY |
3477 | |
3478 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
7ae9f23c EP |
3479 | if (rc) |
3480 | goto out_free; | |
7420ed23 | 3481 | |
5dbe1eb0 | 3482 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3483 | |
7420ed23 | 3484 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3485 | } else |
388b2405 | 3486 | *sid = SECSID_NULL; |
7420ed23 | 3487 | |
0804d113 | 3488 | read_unlock(&policy_rwlock); |
7ae9f23c EP |
3489 | return 0; |
3490 | out_free: | |
7420ed23 | 3491 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c EP |
3492 | out: |
3493 | read_unlock(&policy_rwlock); | |
3494 | return rc; | |
7420ed23 VY |
3495 | } |
3496 | ||
3497 | /** | |
5778eabd PM |
3498 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3499 | * @sid: the SELinux SID | |
3500 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3501 | * |
3502 | * Description: | |
5778eabd PM |
3503 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3504 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3505 | * |
3506 | */ | |
5778eabd | 3507 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3508 | { |
99d854d2 | 3509 | int rc; |
7420ed23 VY |
3510 | struct context *ctx; |
3511 | ||
3512 | if (!ss_initialized) | |
3513 | return 0; | |
3514 | ||
0804d113 | 3515 | read_lock(&policy_rwlock); |
4b02b524 EP |
3516 | |
3517 | rc = -ENOENT; | |
7420ed23 | 3518 | ctx = sidtab_search(&sidtab, sid); |
4b02b524 EP |
3519 | if (ctx == NULL) |
3520 | goto out; | |
3521 | ||
3522 | rc = -ENOMEM; | |
ac76c05b | 3523 | secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3524 | GFP_ATOMIC); |
4b02b524 EP |
3525 | if (secattr->domain == NULL) |
3526 | goto out; | |
3527 | ||
8d75899d PM |
3528 | secattr->attr.secid = sid; |
3529 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3530 | mls_export_netlbl_lvl(ctx, secattr); |
3531 | rc = mls_export_netlbl_cat(ctx, secattr); | |
4b02b524 | 3532 | out: |
0804d113 | 3533 | read_unlock(&policy_rwlock); |
f8687afe PM |
3534 | return rc; |
3535 | } | |
7420ed23 | 3536 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3537 | |
3538 | /** | |
3539 | * security_read_policy - read the policy. | |
3540 | * @data: binary policy data | |
3541 | * @len: length of data in bytes | |
3542 | * | |
3543 | */ | |
6b697323 | 3544 | int security_read_policy(void **data, size_t *len) |
cee74f47 EP |
3545 | { |
3546 | int rc; | |
3547 | struct policy_file fp; | |
3548 | ||
3549 | if (!ss_initialized) | |
3550 | return -EINVAL; | |
3551 | ||
3552 | *len = security_policydb_len(); | |
3553 | ||
845ca30f | 3554 | *data = vmalloc_user(*len); |
cee74f47 EP |
3555 | if (!*data) |
3556 | return -ENOMEM; | |
3557 | ||
3558 | fp.data = *data; | |
3559 | fp.len = *len; | |
3560 | ||
3561 | read_lock(&policy_rwlock); | |
3562 | rc = policydb_write(&policydb, &fp); | |
3563 | read_unlock(&policy_rwlock); | |
3564 | ||
3565 | if (rc) | |
3566 | return rc; | |
3567 | ||
3568 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3569 | return 0; | |
3570 | ||
3571 | } |