Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* Authors: Karl MacMillan <kmacmillan@tresys.com> |
7c2b240e | 2 | * Frank Mayer <mayerf@tresys.com> |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC | |
5 | * This program is free software; you can redistribute it and/or modify | |
7c2b240e | 6 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
7 | * the Free Software Foundation, version 2. |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/spinlock.h> | |
1da177e4 LT |
14 | #include <linux/slab.h> |
15 | ||
16 | #include "security.h" | |
17 | #include "conditional.h" | |
949c2c1d | 18 | #include "services.h" |
1da177e4 LT |
19 | |
20 | /* | |
21 | * cond_evaluate_expr evaluates a conditional expr | |
22 | * in reverse polish notation. It returns true (1), false (0), | |
23 | * or undefined (-1). Undefined occurs when the expression | |
24 | * exceeds the stack depth of COND_EXPR_MAXDEPTH. | |
25 | */ | |
26 | static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr) | |
27 | { | |
28 | ||
29 | struct cond_expr *cur; | |
30 | int s[COND_EXPR_MAXDEPTH]; | |
31 | int sp = -1; | |
32 | ||
dbc74c65 | 33 | for (cur = expr; cur; cur = cur->next) { |
1da177e4 LT |
34 | switch (cur->expr_type) { |
35 | case COND_BOOL: | |
36 | if (sp == (COND_EXPR_MAXDEPTH - 1)) | |
37 | return -1; | |
38 | sp++; | |
39 | s[sp] = p->bool_val_to_struct[cur->bool - 1]->state; | |
40 | break; | |
41 | case COND_NOT: | |
42 | if (sp < 0) | |
43 | return -1; | |
44 | s[sp] = !s[sp]; | |
45 | break; | |
46 | case COND_OR: | |
47 | if (sp < 1) | |
48 | return -1; | |
49 | sp--; | |
50 | s[sp] |= s[sp + 1]; | |
51 | break; | |
52 | case COND_AND: | |
53 | if (sp < 1) | |
54 | return -1; | |
55 | sp--; | |
56 | s[sp] &= s[sp + 1]; | |
57 | break; | |
58 | case COND_XOR: | |
59 | if (sp < 1) | |
60 | return -1; | |
61 | sp--; | |
62 | s[sp] ^= s[sp + 1]; | |
63 | break; | |
64 | case COND_EQ: | |
65 | if (sp < 1) | |
66 | return -1; | |
67 | sp--; | |
68 | s[sp] = (s[sp] == s[sp + 1]); | |
69 | break; | |
70 | case COND_NEQ: | |
71 | if (sp < 1) | |
72 | return -1; | |
73 | sp--; | |
74 | s[sp] = (s[sp] != s[sp + 1]); | |
75 | break; | |
76 | default: | |
77 | return -1; | |
78 | } | |
79 | } | |
80 | return s[0]; | |
81 | } | |
82 | ||
83 | /* | |
84 | * evaluate_cond_node evaluates the conditional stored in | |
85 | * a struct cond_node and if the result is different than the | |
86 | * current state of the node it sets the rules in the true/false | |
87 | * list appropriately. If the result of the expression is undefined | |
88 | * all of the rules are disabled for safety. | |
89 | */ | |
90 | int evaluate_cond_node(struct policydb *p, struct cond_node *node) | |
91 | { | |
92 | int new_state; | |
7c2b240e | 93 | struct cond_av_list *cur; |
1da177e4 LT |
94 | |
95 | new_state = cond_evaluate_expr(p, node->expr); | |
96 | if (new_state != node->cur_state) { | |
97 | node->cur_state = new_state; | |
98 | if (new_state == -1) | |
454d972c | 99 | printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n"); |
1da177e4 | 100 | /* turn the rules on or off */ |
dbc74c65 | 101 | for (cur = node->true_list; cur; cur = cur->next) { |
7c2b240e | 102 | if (new_state <= 0) |
782ebb99 | 103 | cur->node->key.specified &= ~AVTAB_ENABLED; |
7c2b240e | 104 | else |
782ebb99 | 105 | cur->node->key.specified |= AVTAB_ENABLED; |
1da177e4 LT |
106 | } |
107 | ||
dbc74c65 | 108 | for (cur = node->false_list; cur; cur = cur->next) { |
1da177e4 | 109 | /* -1 or 1 */ |
7c2b240e | 110 | if (new_state) |
782ebb99 | 111 | cur->node->key.specified &= ~AVTAB_ENABLED; |
7c2b240e | 112 | else |
782ebb99 | 113 | cur->node->key.specified |= AVTAB_ENABLED; |
1da177e4 LT |
114 | } |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | int cond_policydb_init(struct policydb *p) | |
120 | { | |
38184c52 DC |
121 | int rc; |
122 | ||
1da177e4 LT |
123 | p->bool_val_to_struct = NULL; |
124 | p->cond_list = NULL; | |
38184c52 DC |
125 | |
126 | rc = avtab_init(&p->te_cond_avtab); | |
127 | if (rc) | |
128 | return rc; | |
1da177e4 LT |
129 | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static void cond_av_list_destroy(struct cond_av_list *list) | |
134 | { | |
135 | struct cond_av_list *cur, *next; | |
dbc74c65 | 136 | for (cur = list; cur; cur = next) { |
1da177e4 LT |
137 | next = cur->next; |
138 | /* the avtab_ptr_t node is destroy by the avtab */ | |
139 | kfree(cur); | |
140 | } | |
141 | } | |
142 | ||
143 | static void cond_node_destroy(struct cond_node *node) | |
144 | { | |
145 | struct cond_expr *cur_expr, *next_expr; | |
146 | ||
dbc74c65 | 147 | for (cur_expr = node->expr; cur_expr; cur_expr = next_expr) { |
1da177e4 LT |
148 | next_expr = cur_expr->next; |
149 | kfree(cur_expr); | |
150 | } | |
151 | cond_av_list_destroy(node->true_list); | |
152 | cond_av_list_destroy(node->false_list); | |
153 | kfree(node); | |
154 | } | |
155 | ||
156 | static void cond_list_destroy(struct cond_node *list) | |
157 | { | |
158 | struct cond_node *next, *cur; | |
159 | ||
160 | if (list == NULL) | |
161 | return; | |
162 | ||
dbc74c65 | 163 | for (cur = list; cur; cur = next) { |
1da177e4 LT |
164 | next = cur->next; |
165 | cond_node_destroy(cur); | |
166 | } | |
167 | } | |
168 | ||
169 | void cond_policydb_destroy(struct policydb *p) | |
170 | { | |
9a5f04bf | 171 | kfree(p->bool_val_to_struct); |
1da177e4 LT |
172 | avtab_destroy(&p->te_cond_avtab); |
173 | cond_list_destroy(p->cond_list); | |
174 | } | |
175 | ||
176 | int cond_init_bool_indexes(struct policydb *p) | |
177 | { | |
9a5f04bf | 178 | kfree(p->bool_val_to_struct); |
2ff6fa8f | 179 | p->bool_val_to_struct = |
7c2b240e | 180 | kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL); |
1da177e4 | 181 | if (!p->bool_val_to_struct) |
3ac285ff | 182 | return -ENOMEM; |
1da177e4 LT |
183 | return 0; |
184 | } | |
185 | ||
186 | int cond_destroy_bool(void *key, void *datum, void *p) | |
187 | { | |
9a5f04bf | 188 | kfree(key); |
1da177e4 LT |
189 | kfree(datum); |
190 | return 0; | |
191 | } | |
192 | ||
193 | int cond_index_bool(void *key, void *datum, void *datap) | |
194 | { | |
195 | struct policydb *p; | |
196 | struct cond_bool_datum *booldatum; | |
ac76c05b | 197 | struct flex_array *fa; |
1da177e4 LT |
198 | |
199 | booldatum = datum; | |
200 | p = datap; | |
201 | ||
202 | if (!booldatum->value || booldatum->value > p->p_bools.nprim) | |
203 | return -EINVAL; | |
204 | ||
ac76c05b EP |
205 | fa = p->sym_val_to_name[SYM_BOOLS]; |
206 | if (flex_array_put_ptr(fa, booldatum->value - 1, key, | |
207 | GFP_KERNEL | __GFP_ZERO)) | |
208 | BUG(); | |
7c2b240e | 209 | p->bool_val_to_struct[booldatum->value - 1] = booldatum; |
1da177e4 LT |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int bool_isvalid(struct cond_bool_datum *b) | |
215 | { | |
216 | if (!(b->state == 0 || b->state == 1)) | |
217 | return 0; | |
218 | return 1; | |
219 | } | |
220 | ||
221 | int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp) | |
222 | { | |
223 | char *key = NULL; | |
224 | struct cond_bool_datum *booldatum; | |
b5bf6c55 AD |
225 | __le32 buf[3]; |
226 | u32 len; | |
1da177e4 LT |
227 | int rc; |
228 | ||
89d155ef | 229 | booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL); |
1da177e4 | 230 | if (!booldatum) |
338437f6 | 231 | return -ENOMEM; |
1da177e4 LT |
232 | |
233 | rc = next_entry(buf, fp, sizeof buf); | |
338437f6 | 234 | if (rc) |
1da177e4 LT |
235 | goto err; |
236 | ||
237 | booldatum->value = le32_to_cpu(buf[0]); | |
238 | booldatum->state = le32_to_cpu(buf[1]); | |
239 | ||
338437f6 | 240 | rc = -EINVAL; |
1da177e4 LT |
241 | if (!bool_isvalid(booldatum)) |
242 | goto err; | |
243 | ||
244 | len = le32_to_cpu(buf[2]); | |
245 | ||
338437f6 | 246 | rc = -ENOMEM; |
1da177e4 LT |
247 | key = kmalloc(len + 1, GFP_KERNEL); |
248 | if (!key) | |
249 | goto err; | |
250 | rc = next_entry(key, fp, len); | |
338437f6 | 251 | if (rc) |
1da177e4 | 252 | goto err; |
df4ea865 | 253 | key[len] = '\0'; |
338437f6 DC |
254 | rc = hashtab_insert(h, key, booldatum); |
255 | if (rc) | |
1da177e4 LT |
256 | goto err; |
257 | ||
258 | return 0; | |
259 | err: | |
260 | cond_destroy_bool(key, booldatum, NULL); | |
338437f6 | 261 | return rc; |
1da177e4 LT |
262 | } |
263 | ||
7c2b240e | 264 | struct cond_insertf_data { |
782ebb99 SS |
265 | struct policydb *p; |
266 | struct cond_av_list *other; | |
267 | struct cond_av_list *head; | |
268 | struct cond_av_list *tail; | |
269 | }; | |
270 | ||
271 | static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum *d, void *ptr) | |
272 | { | |
273 | struct cond_insertf_data *data = ptr; | |
274 | struct policydb *p = data->p; | |
275 | struct cond_av_list *other = data->other, *list, *cur; | |
1da177e4 | 276 | struct avtab_node *node_ptr; |
1da177e4 | 277 | u8 found; |
9d623b17 | 278 | int rc = -EINVAL; |
1da177e4 | 279 | |
782ebb99 SS |
280 | /* |
281 | * For type rules we have to make certain there aren't any | |
282 | * conflicting rules by searching the te_avtab and the | |
283 | * cond_te_avtab. | |
284 | */ | |
285 | if (k->specified & AVTAB_TYPE) { | |
286 | if (avtab_search(&p->te_avtab, k)) { | |
744ba35e | 287 | printk(KERN_ERR "SELinux: type rule already exists outside of a conditional.\n"); |
1da177e4 | 288 | goto err; |
782ebb99 | 289 | } |
1da177e4 | 290 | /* |
782ebb99 SS |
291 | * If we are reading the false list other will be a pointer to |
292 | * the true list. We can have duplicate entries if there is only | |
293 | * 1 other entry and it is in our true list. | |
294 | * | |
295 | * If we are reading the true list (other == NULL) there shouldn't | |
296 | * be any other entries. | |
1da177e4 | 297 | */ |
782ebb99 SS |
298 | if (other) { |
299 | node_ptr = avtab_search_node(&p->te_cond_avtab, k); | |
300 | if (node_ptr) { | |
301 | if (avtab_search_node_next(node_ptr, k->specified)) { | |
744ba35e | 302 | printk(KERN_ERR "SELinux: too many conflicting type rules.\n"); |
782ebb99 SS |
303 | goto err; |
304 | } | |
305 | found = 0; | |
dbc74c65 | 306 | for (cur = other; cur; cur = cur->next) { |
782ebb99 SS |
307 | if (cur->node == node_ptr) { |
308 | found = 1; | |
309 | break; | |
1da177e4 LT |
310 | } |
311 | } | |
782ebb99 | 312 | if (!found) { |
744ba35e | 313 | printk(KERN_ERR "SELinux: conflicting type rules.\n"); |
1da177e4 LT |
314 | goto err; |
315 | } | |
316 | } | |
782ebb99 SS |
317 | } else { |
318 | if (avtab_search(&p->te_cond_avtab, k)) { | |
744ba35e | 319 | printk(KERN_ERR "SELinux: conflicting type rules when adding type rule for true.\n"); |
782ebb99 SS |
320 | goto err; |
321 | } | |
1da177e4 | 322 | } |
782ebb99 | 323 | } |
1da177e4 | 324 | |
782ebb99 SS |
325 | node_ptr = avtab_insert_nonunique(&p->te_cond_avtab, k, d); |
326 | if (!node_ptr) { | |
744ba35e | 327 | printk(KERN_ERR "SELinux: could not insert rule.\n"); |
9d623b17 | 328 | rc = -ENOMEM; |
782ebb99 | 329 | goto err; |
1da177e4 LT |
330 | } |
331 | ||
89d155ef | 332 | list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL); |
9d623b17 DC |
333 | if (!list) { |
334 | rc = -ENOMEM; | |
782ebb99 | 335 | goto err; |
9d623b17 | 336 | } |
782ebb99 SS |
337 | |
338 | list->node = node_ptr; | |
339 | if (!data->head) | |
340 | data->head = list; | |
341 | else | |
342 | data->tail->next = list; | |
343 | data->tail = list; | |
1da177e4 | 344 | return 0; |
782ebb99 | 345 | |
1da177e4 | 346 | err: |
782ebb99 SS |
347 | cond_av_list_destroy(data->head); |
348 | data->head = NULL; | |
9d623b17 | 349 | return rc; |
1da177e4 LT |
350 | } |
351 | ||
782ebb99 SS |
352 | static int cond_read_av_list(struct policydb *p, void *fp, struct cond_av_list **ret_list, struct cond_av_list *other) |
353 | { | |
354 | int i, rc; | |
b5bf6c55 AD |
355 | __le32 buf[1]; |
356 | u32 len; | |
782ebb99 SS |
357 | struct cond_insertf_data data; |
358 | ||
359 | *ret_list = NULL; | |
360 | ||
361 | len = 0; | |
362 | rc = next_entry(buf, fp, sizeof(u32)); | |
9d623b17 DC |
363 | if (rc) |
364 | return rc; | |
782ebb99 SS |
365 | |
366 | len = le32_to_cpu(buf[0]); | |
7c2b240e | 367 | if (len == 0) |
782ebb99 | 368 | return 0; |
782ebb99 SS |
369 | |
370 | data.p = p; | |
371 | data.other = other; | |
372 | data.head = NULL; | |
373 | data.tail = NULL; | |
374 | for (i = 0; i < len; i++) { | |
45e5421e SS |
375 | rc = avtab_read_item(&p->te_cond_avtab, fp, p, cond_insertf, |
376 | &data); | |
782ebb99 SS |
377 | if (rc) |
378 | return rc; | |
782ebb99 SS |
379 | } |
380 | ||
381 | *ret_list = data.head; | |
382 | return 0; | |
383 | } | |
384 | ||
1da177e4 LT |
385 | static int expr_isvalid(struct policydb *p, struct cond_expr *expr) |
386 | { | |
387 | if (expr->expr_type <= 0 || expr->expr_type > COND_LAST) { | |
744ba35e | 388 | printk(KERN_ERR "SELinux: conditional expressions uses unknown operator.\n"); |
1da177e4 LT |
389 | return 0; |
390 | } | |
391 | ||
392 | if (expr->bool > p->p_bools.nprim) { | |
744ba35e | 393 | printk(KERN_ERR "SELinux: conditional expressions uses unknown bool.\n"); |
1da177e4 LT |
394 | return 0; |
395 | } | |
396 | return 1; | |
397 | } | |
398 | ||
399 | static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp) | |
400 | { | |
b5bf6c55 AD |
401 | __le32 buf[2]; |
402 | u32 len, i; | |
1da177e4 LT |
403 | int rc; |
404 | struct cond_expr *expr = NULL, *last = NULL; | |
405 | ||
406 | rc = next_entry(buf, fp, sizeof(u32)); | |
fc5c126e DC |
407 | if (rc) |
408 | return rc; | |
1da177e4 LT |
409 | |
410 | node->cur_state = le32_to_cpu(buf[0]); | |
411 | ||
412 | len = 0; | |
413 | rc = next_entry(buf, fp, sizeof(u32)); | |
fc5c126e DC |
414 | if (rc) |
415 | return rc; | |
1da177e4 LT |
416 | |
417 | /* expr */ | |
418 | len = le32_to_cpu(buf[0]); | |
419 | ||
7c2b240e | 420 | for (i = 0; i < len; i++) { |
1da177e4 | 421 | rc = next_entry(buf, fp, sizeof(u32) * 2); |
fc5c126e | 422 | if (rc) |
1da177e4 LT |
423 | goto err; |
424 | ||
fc5c126e | 425 | rc = -ENOMEM; |
89d155ef | 426 | expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL); |
7c2b240e | 427 | if (!expr) |
1da177e4 | 428 | goto err; |
1da177e4 LT |
429 | |
430 | expr->expr_type = le32_to_cpu(buf[0]); | |
431 | expr->bool = le32_to_cpu(buf[1]); | |
432 | ||
433 | if (!expr_isvalid(p, expr)) { | |
fc5c126e | 434 | rc = -EINVAL; |
1da177e4 LT |
435 | kfree(expr); |
436 | goto err; | |
437 | } | |
438 | ||
7c2b240e | 439 | if (i == 0) |
1da177e4 | 440 | node->expr = expr; |
7c2b240e | 441 | else |
1da177e4 | 442 | last->next = expr; |
1da177e4 LT |
443 | last = expr; |
444 | } | |
445 | ||
fc5c126e DC |
446 | rc = cond_read_av_list(p, fp, &node->true_list, NULL); |
447 | if (rc) | |
1da177e4 | 448 | goto err; |
fc5c126e DC |
449 | rc = cond_read_av_list(p, fp, &node->false_list, node->true_list); |
450 | if (rc) | |
1da177e4 LT |
451 | goto err; |
452 | return 0; | |
453 | err: | |
454 | cond_node_destroy(node); | |
fc5c126e | 455 | return rc; |
1da177e4 LT |
456 | } |
457 | ||
458 | int cond_read_list(struct policydb *p, void *fp) | |
459 | { | |
460 | struct cond_node *node, *last = NULL; | |
b5bf6c55 AD |
461 | __le32 buf[1]; |
462 | u32 i, len; | |
1da177e4 LT |
463 | int rc; |
464 | ||
465 | rc = next_entry(buf, fp, sizeof buf); | |
5241c107 DC |
466 | if (rc) |
467 | return rc; | |
1da177e4 LT |
468 | |
469 | len = le32_to_cpu(buf[0]); | |
470 | ||
3232c110 YN |
471 | rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel); |
472 | if (rc) | |
473 | goto err; | |
474 | ||
1da177e4 | 475 | for (i = 0; i < len; i++) { |
5241c107 | 476 | rc = -ENOMEM; |
89d155ef | 477 | node = kzalloc(sizeof(struct cond_node), GFP_KERNEL); |
1da177e4 LT |
478 | if (!node) |
479 | goto err; | |
1da177e4 | 480 | |
5241c107 DC |
481 | rc = cond_read_node(p, node, fp); |
482 | if (rc) | |
1da177e4 LT |
483 | goto err; |
484 | ||
7c2b240e | 485 | if (i == 0) |
1da177e4 | 486 | p->cond_list = node; |
7c2b240e | 487 | else |
1da177e4 | 488 | last->next = node; |
1da177e4 LT |
489 | last = node; |
490 | } | |
491 | return 0; | |
492 | err: | |
493 | cond_list_destroy(p->cond_list); | |
782ebb99 | 494 | p->cond_list = NULL; |
5241c107 | 495 | return rc; |
1da177e4 LT |
496 | } |
497 | ||
cee74f47 EP |
498 | int cond_write_bool(void *vkey, void *datum, void *ptr) |
499 | { | |
500 | char *key = vkey; | |
501 | struct cond_bool_datum *booldatum = datum; | |
502 | struct policy_data *pd = ptr; | |
503 | void *fp = pd->fp; | |
504 | __le32 buf[3]; | |
505 | u32 len; | |
506 | int rc; | |
507 | ||
508 | len = strlen(key); | |
509 | buf[0] = cpu_to_le32(booldatum->value); | |
510 | buf[1] = cpu_to_le32(booldatum->state); | |
511 | buf[2] = cpu_to_le32(len); | |
512 | rc = put_entry(buf, sizeof(u32), 3, fp); | |
513 | if (rc) | |
514 | return rc; | |
515 | rc = put_entry(key, 1, len, fp); | |
516 | if (rc) | |
517 | return rc; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | /* | |
522 | * cond_write_cond_av_list doesn't write out the av_list nodes. | |
523 | * Instead it writes out the key/value pairs from the avtab. This | |
524 | * is necessary because there is no way to uniquely identifying rules | |
525 | * in the avtab so it is not possible to associate individual rules | |
526 | * in the avtab with a conditional without saving them as part of | |
527 | * the conditional. This means that the avtab with the conditional | |
528 | * rules will not be saved but will be rebuilt on policy load. | |
529 | */ | |
530 | static int cond_write_av_list(struct policydb *p, | |
531 | struct cond_av_list *list, struct policy_file *fp) | |
532 | { | |
533 | __le32 buf[1]; | |
534 | struct cond_av_list *cur_list; | |
535 | u32 len; | |
536 | int rc; | |
537 | ||
538 | len = 0; | |
539 | for (cur_list = list; cur_list != NULL; cur_list = cur_list->next) | |
540 | len++; | |
541 | ||
542 | buf[0] = cpu_to_le32(len); | |
543 | rc = put_entry(buf, sizeof(u32), 1, fp); | |
544 | if (rc) | |
545 | return rc; | |
546 | ||
547 | if (len == 0) | |
548 | return 0; | |
549 | ||
550 | for (cur_list = list; cur_list != NULL; cur_list = cur_list->next) { | |
551 | rc = avtab_write_item(p, cur_list->node, fp); | |
552 | if (rc) | |
553 | return rc; | |
554 | } | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
7b98a585 | 559 | static int cond_write_node(struct policydb *p, struct cond_node *node, |
cee74f47 EP |
560 | struct policy_file *fp) |
561 | { | |
562 | struct cond_expr *cur_expr; | |
563 | __le32 buf[2]; | |
564 | int rc; | |
565 | u32 len = 0; | |
566 | ||
567 | buf[0] = cpu_to_le32(node->cur_state); | |
568 | rc = put_entry(buf, sizeof(u32), 1, fp); | |
569 | if (rc) | |
570 | return rc; | |
571 | ||
572 | for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) | |
573 | len++; | |
574 | ||
575 | buf[0] = cpu_to_le32(len); | |
576 | rc = put_entry(buf, sizeof(u32), 1, fp); | |
577 | if (rc) | |
578 | return rc; | |
579 | ||
580 | for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) { | |
581 | buf[0] = cpu_to_le32(cur_expr->expr_type); | |
582 | buf[1] = cpu_to_le32(cur_expr->bool); | |
583 | rc = put_entry(buf, sizeof(u32), 2, fp); | |
584 | if (rc) | |
585 | return rc; | |
586 | } | |
587 | ||
588 | rc = cond_write_av_list(p, node->true_list, fp); | |
589 | if (rc) | |
590 | return rc; | |
591 | rc = cond_write_av_list(p, node->false_list, fp); | |
592 | if (rc) | |
593 | return rc; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | int cond_write_list(struct policydb *p, struct cond_node *list, void *fp) | |
599 | { | |
600 | struct cond_node *cur; | |
601 | u32 len; | |
602 | __le32 buf[1]; | |
603 | int rc; | |
604 | ||
605 | len = 0; | |
606 | for (cur = list; cur != NULL; cur = cur->next) | |
607 | len++; | |
608 | buf[0] = cpu_to_le32(len); | |
609 | rc = put_entry(buf, sizeof(u32), 1, fp); | |
610 | if (rc) | |
611 | return rc; | |
612 | ||
613 | for (cur = list; cur != NULL; cur = cur->next) { | |
614 | rc = cond_write_node(p, cur, fp); | |
615 | if (rc) | |
616 | return rc; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
949c2c1d S |
621 | |
622 | void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key, | |
623 | struct extended_perms_decision *xpermd) | |
624 | { | |
625 | struct avtab_node *node; | |
626 | ||
627 | if (!ctab || !key || !xpermd) | |
628 | return; | |
629 | ||
630 | for (node = avtab_search_node(ctab, key); node; | |
631 | node = avtab_search_node_next(node, key->specified)) { | |
632 | if (node->key.specified & AVTAB_ENABLED) | |
633 | services_compute_xperms_decision(xpermd, node); | |
634 | } | |
635 | return; | |
636 | ||
637 | } | |
1da177e4 LT |
638 | /* Determine whether additional permissions are granted by the conditional |
639 | * av table, and if so, add them to the result | |
640 | */ | |
949c2c1d S |
641 | void cond_compute_av(struct avtab *ctab, struct avtab_key *key, |
642 | struct av_decision *avd, struct extended_perms *xperms) | |
1da177e4 LT |
643 | { |
644 | struct avtab_node *node; | |
645 | ||
7c2b240e | 646 | if (!ctab || !key || !avd) |
1da177e4 LT |
647 | return; |
648 | ||
dbc74c65 | 649 | for (node = avtab_search_node(ctab, key); node; |
782ebb99 | 650 | node = avtab_search_node_next(node, key->specified)) { |
7c2b240e EP |
651 | if ((u16)(AVTAB_ALLOWED|AVTAB_ENABLED) == |
652 | (node->key.specified & (AVTAB_ALLOWED|AVTAB_ENABLED))) | |
949c2c1d | 653 | avd->allowed |= node->datum.u.data; |
7c2b240e EP |
654 | if ((u16)(AVTAB_AUDITDENY|AVTAB_ENABLED) == |
655 | (node->key.specified & (AVTAB_AUDITDENY|AVTAB_ENABLED))) | |
1da177e4 LT |
656 | /* Since a '0' in an auditdeny mask represents a |
657 | * permission we do NOT want to audit (dontaudit), we use | |
658 | * the '&' operand to ensure that all '0's in the mask | |
659 | * are retained (much unlike the allow and auditallow cases). | |
660 | */ | |
949c2c1d | 661 | avd->auditdeny &= node->datum.u.data; |
7c2b240e EP |
662 | if ((u16)(AVTAB_AUDITALLOW|AVTAB_ENABLED) == |
663 | (node->key.specified & (AVTAB_AUDITALLOW|AVTAB_ENABLED))) | |
949c2c1d S |
664 | avd->auditallow |= node->datum.u.data; |
665 | if (xperms && (node->key.specified & AVTAB_ENABLED) && | |
666 | (node->key.specified & AVTAB_XPERMS)) | |
667 | services_compute_xperms_drivers(xperms, node); | |
1da177e4 LT |
668 | } |
669 | return; | |
670 | } |