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