2 * Implementation of the policy database.
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 * Support for enhanced MLS infrastructure.
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
14 * Added conditional policy language extensions
16 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
17 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation, version 2.
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
30 #include "conditional.h"
36 static char *symtab_name[SYM_NUM] = {
48 int selinux_mls_enabled = 0;
50 static unsigned int symtab_sizes[SYM_NUM] = {
61 struct policydb_compat_info {
67 /* These need to be updated if SYM_NUM or OCON_NUM changes */
68 static struct policydb_compat_info policydb_compat[] = {
70 .version = POLICYDB_VERSION_BASE,
71 .sym_num = SYM_NUM - 3,
72 .ocon_num = OCON_NUM - 1,
75 .version = POLICYDB_VERSION_BOOL,
76 .sym_num = SYM_NUM - 2,
77 .ocon_num = OCON_NUM - 1,
80 .version = POLICYDB_VERSION_IPV6,
81 .sym_num = SYM_NUM - 2,
85 .version = POLICYDB_VERSION_NLCLASS,
86 .sym_num = SYM_NUM - 2,
90 .version = POLICYDB_VERSION_MLS,
95 .version = POLICYDB_VERSION_AVTAB,
100 .version = POLICYDB_VERSION_RANGETRANS,
102 .ocon_num = OCON_NUM,
106 static struct policydb_compat_info *policydb_lookup_compat(int version)
109 struct policydb_compat_info *info = NULL;
111 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
112 if (policydb_compat[i].version == version) {
113 info = &policydb_compat[i];
121 * Initialize the role table.
123 static int roles_init(struct policydb *p)
127 struct role_datum *role;
129 role = kzalloc(sizeof(*role), GFP_KERNEL);
134 role->value = ++p->p_roles.nprim;
135 if (role->value != OBJECT_R_VAL) {
139 key = kmalloc(strlen(OBJECT_R)+1,GFP_KERNEL);
144 strcpy(key, OBJECT_R);
145 rc = hashtab_insert(p->p_roles.table, key, role);
159 * Initialize a policy database structure.
161 static int policydb_init(struct policydb *p)
165 memset(p, 0, sizeof(*p));
167 for (i = 0; i < SYM_NUM; i++) {
168 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
170 goto out_free_symtab;
173 rc = avtab_init(&p->te_avtab);
175 goto out_free_symtab;
181 rc = cond_policydb_init(p);
189 avtab_destroy(&p->te_avtab);
192 for (i = 0; i < SYM_NUM; i++)
193 hashtab_destroy(p->symtab[i].table);
198 * The following *_index functions are used to
199 * define the val_to_name and val_to_struct arrays
200 * in a policy database structure. The val_to_name
201 * arrays are used when converting security context
202 * structures into string representations. The
203 * val_to_struct arrays are used when the attributes
204 * of a class, role, or user are needed.
207 static int common_index(void *key, void *datum, void *datap)
210 struct common_datum *comdatum;
214 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
216 p->p_common_val_to_name[comdatum->value - 1] = key;
220 static int class_index(void *key, void *datum, void *datap)
223 struct class_datum *cladatum;
227 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
229 p->p_class_val_to_name[cladatum->value - 1] = key;
230 p->class_val_to_struct[cladatum->value - 1] = cladatum;
234 static int role_index(void *key, void *datum, void *datap)
237 struct role_datum *role;
241 if (!role->value || role->value > p->p_roles.nprim)
243 p->p_role_val_to_name[role->value - 1] = key;
244 p->role_val_to_struct[role->value - 1] = role;
248 static int type_index(void *key, void *datum, void *datap)
251 struct type_datum *typdatum;
256 if (typdatum->primary) {
257 if (!typdatum->value || typdatum->value > p->p_types.nprim)
259 p->p_type_val_to_name[typdatum->value - 1] = key;
265 static int user_index(void *key, void *datum, void *datap)
268 struct user_datum *usrdatum;
272 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
274 p->p_user_val_to_name[usrdatum->value - 1] = key;
275 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
279 static int sens_index(void *key, void *datum, void *datap)
282 struct level_datum *levdatum;
287 if (!levdatum->isalias) {
288 if (!levdatum->level->sens ||
289 levdatum->level->sens > p->p_levels.nprim)
291 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
297 static int cat_index(void *key, void *datum, void *datap)
300 struct cat_datum *catdatum;
305 if (!catdatum->isalias) {
306 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
308 p->p_cat_val_to_name[catdatum->value - 1] = key;
314 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
327 * Define the common val_to_name array and the class
328 * val_to_name and val_to_struct arrays in a policy
329 * database structure.
331 * Caller must clean up upon failure.
333 static int policydb_index_classes(struct policydb *p)
337 p->p_common_val_to_name =
338 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
339 if (!p->p_common_val_to_name) {
344 rc = hashtab_map(p->p_commons.table, common_index, p);
348 p->class_val_to_struct =
349 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
350 if (!p->class_val_to_struct) {
355 p->p_class_val_to_name =
356 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
357 if (!p->p_class_val_to_name) {
362 rc = hashtab_map(p->p_classes.table, class_index, p);
368 static void symtab_hash_eval(struct symtab *s)
372 for (i = 0; i < SYM_NUM; i++) {
373 struct hashtab *h = s[i].table;
374 struct hashtab_info info;
376 hashtab_stat(h, &info);
377 printk(KERN_INFO "%s: %d entries and %d/%d buckets used, "
378 "longest chain length %d\n", symtab_name[i], h->nel,
379 info.slots_used, h->size, info.max_chain_len);
385 * Define the other val_to_name and val_to_struct arrays
386 * in a policy database structure.
388 * Caller must clean up on failure.
390 static int policydb_index_others(struct policydb *p)
394 printk(KERN_INFO "security: %d users, %d roles, %d types, %d bools",
395 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
396 if (selinux_mls_enabled)
397 printk(", %d sens, %d cats", p->p_levels.nprim,
401 printk(KERN_INFO "security: %d classes, %d rules\n",
402 p->p_classes.nprim, p->te_avtab.nel);
405 avtab_hash_eval(&p->te_avtab, "rules");
406 symtab_hash_eval(p->symtab);
409 p->role_val_to_struct =
410 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
412 if (!p->role_val_to_struct) {
417 p->user_val_to_struct =
418 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
420 if (!p->user_val_to_struct) {
425 if (cond_init_bool_indexes(p)) {
430 for (i = SYM_ROLES; i < SYM_NUM; i++) {
431 p->sym_val_to_name[i] =
432 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
433 if (!p->sym_val_to_name[i]) {
437 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
447 * The following *_destroy functions are used to
448 * free any memory allocated for each kind of
449 * symbol data in the policy database.
452 static int perm_destroy(void *key, void *datum, void *p)
459 static int common_destroy(void *key, void *datum, void *p)
461 struct common_datum *comdatum;
465 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
466 hashtab_destroy(comdatum->permissions.table);
471 static int class_destroy(void *key, void *datum, void *p)
473 struct class_datum *cladatum;
474 struct constraint_node *constraint, *ctemp;
475 struct constraint_expr *e, *etmp;
479 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
480 hashtab_destroy(cladatum->permissions.table);
481 constraint = cladatum->constraints;
483 e = constraint->expr;
485 ebitmap_destroy(&e->names);
491 constraint = constraint->next;
495 constraint = cladatum->validatetrans;
497 e = constraint->expr;
499 ebitmap_destroy(&e->names);
505 constraint = constraint->next;
509 kfree(cladatum->comkey);
514 static int role_destroy(void *key, void *datum, void *p)
516 struct role_datum *role;
520 ebitmap_destroy(&role->dominates);
521 ebitmap_destroy(&role->types);
526 static int type_destroy(void *key, void *datum, void *p)
533 static int user_destroy(void *key, void *datum, void *p)
535 struct user_datum *usrdatum;
539 ebitmap_destroy(&usrdatum->roles);
540 ebitmap_destroy(&usrdatum->range.level[0].cat);
541 ebitmap_destroy(&usrdatum->range.level[1].cat);
542 ebitmap_destroy(&usrdatum->dfltlevel.cat);
547 static int sens_destroy(void *key, void *datum, void *p)
549 struct level_datum *levdatum;
553 ebitmap_destroy(&levdatum->level->cat);
554 kfree(levdatum->level);
559 static int cat_destroy(void *key, void *datum, void *p)
566 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
578 static void ocontext_destroy(struct ocontext *c, int i)
580 context_destroy(&c->context[0]);
581 context_destroy(&c->context[1]);
582 if (i == OCON_ISID || i == OCON_FS ||
583 i == OCON_NETIF || i == OCON_FSUSE)
589 * Free any memory allocated by a policy database structure.
591 void policydb_destroy(struct policydb *p)
593 struct ocontext *c, *ctmp;
594 struct genfs *g, *gtmp;
596 struct role_allow *ra, *lra = NULL;
597 struct role_trans *tr, *ltr = NULL;
598 struct range_trans *rt, *lrt = NULL;
600 for (i = 0; i < SYM_NUM; i++) {
601 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
602 hashtab_destroy(p->symtab[i].table);
605 for (i = 0; i < SYM_NUM; i++)
606 kfree(p->sym_val_to_name[i]);
608 kfree(p->class_val_to_struct);
609 kfree(p->role_val_to_struct);
610 kfree(p->user_val_to_struct);
612 avtab_destroy(&p->te_avtab);
614 for (i = 0; i < OCON_NUM; i++) {
619 ocontext_destroy(ctmp,i);
630 ocontext_destroy(ctmp,OCON_FSUSE);
637 cond_policydb_destroy(p);
639 for (tr = p->role_tr; tr; tr = tr->next) {
645 for (ra = p->role_allow; ra; ra = ra -> next) {
651 for (rt = p->range_tr; rt; rt = rt -> next) {
653 ebitmap_destroy(&lrt->target_range.level[0].cat);
654 ebitmap_destroy(&lrt->target_range.level[1].cat);
660 ebitmap_destroy(&lrt->target_range.level[0].cat);
661 ebitmap_destroy(&lrt->target_range.level[1].cat);
665 if (p->type_attr_map) {
666 for (i = 0; i < p->p_types.nprim; i++)
667 ebitmap_destroy(&p->type_attr_map[i]);
669 kfree(p->type_attr_map);
675 * Load the initial SIDs specified in a policy database
676 * structure into a SID table.
678 int policydb_load_isids(struct policydb *p, struct sidtab *s)
680 struct ocontext *head, *c;
685 printk(KERN_ERR "security: out of memory on SID table init\n");
689 head = p->ocontexts[OCON_ISID];
690 for (c = head; c; c = c->next) {
691 if (!c->context[0].user) {
692 printk(KERN_ERR "security: SID %s was never "
693 "defined.\n", c->u.name);
697 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
698 printk(KERN_ERR "security: unable to load initial "
699 "SID %s.\n", c->u.name);
709 * Return 1 if the fields in the security context
710 * structure `c' are valid. Return 0 otherwise.
712 int policydb_context_isvalid(struct policydb *p, struct context *c)
714 struct role_datum *role;
715 struct user_datum *usrdatum;
717 if (!c->role || c->role > p->p_roles.nprim)
720 if (!c->user || c->user > p->p_users.nprim)
723 if (!c->type || c->type > p->p_types.nprim)
726 if (c->role != OBJECT_R_VAL) {
728 * Role must be authorized for the type.
730 role = p->role_val_to_struct[c->role - 1];
731 if (!ebitmap_get_bit(&role->types,
733 /* role may not be associated with type */
737 * User must be authorized for the role.
739 usrdatum = p->user_val_to_struct[c->user - 1];
743 if (!ebitmap_get_bit(&usrdatum->roles,
745 /* user may not be associated with role */
749 if (!mls_context_isvalid(p, c))
756 * Read a MLS range structure from a policydb binary
757 * representation file.
759 static int mls_read_range_helper(struct mls_range *r, void *fp)
765 rc = next_entry(buf, fp, sizeof(u32));
769 items = le32_to_cpu(buf[0]);
770 if (items > ARRAY_SIZE(buf)) {
771 printk(KERN_ERR "security: mls: range overflow\n");
775 rc = next_entry(buf, fp, sizeof(u32) * items);
777 printk(KERN_ERR "security: mls: truncated range\n");
780 r->level[0].sens = le32_to_cpu(buf[0]);
782 r->level[1].sens = le32_to_cpu(buf[1]);
784 r->level[1].sens = r->level[0].sens;
786 rc = ebitmap_read(&r->level[0].cat, fp);
788 printk(KERN_ERR "security: mls: error reading low "
793 rc = ebitmap_read(&r->level[1].cat, fp);
795 printk(KERN_ERR "security: mls: error reading high "
800 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
802 printk(KERN_ERR "security: mls: out of memory\n");
811 ebitmap_destroy(&r->level[0].cat);
816 * Read and validate a security context structure
817 * from a policydb binary representation file.
819 static int context_read_and_validate(struct context *c,
826 rc = next_entry(buf, fp, sizeof buf);
828 printk(KERN_ERR "security: context truncated\n");
831 c->user = le32_to_cpu(buf[0]);
832 c->role = le32_to_cpu(buf[1]);
833 c->type = le32_to_cpu(buf[2]);
834 if (p->policyvers >= POLICYDB_VERSION_MLS) {
835 if (mls_read_range_helper(&c->range, fp)) {
836 printk(KERN_ERR "security: error reading MLS range of "
843 if (!policydb_context_isvalid(p, c)) {
844 printk(KERN_ERR "security: invalid security context\n");
853 * The following *_read functions are used to
854 * read the symbol data from a policy database
855 * binary representation file.
858 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
861 struct perm_datum *perdatum;
866 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
872 rc = next_entry(buf, fp, sizeof buf);
876 len = le32_to_cpu(buf[0]);
877 perdatum->value = le32_to_cpu(buf[1]);
879 key = kmalloc(len + 1,GFP_KERNEL);
884 rc = next_entry(key, fp, len);
889 rc = hashtab_insert(h, key, perdatum);
895 perm_destroy(key, perdatum, NULL);
899 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
902 struct common_datum *comdatum;
907 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
913 rc = next_entry(buf, fp, sizeof buf);
917 len = le32_to_cpu(buf[0]);
918 comdatum->value = le32_to_cpu(buf[1]);
920 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
923 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
924 nel = le32_to_cpu(buf[3]);
926 key = kmalloc(len + 1,GFP_KERNEL);
931 rc = next_entry(key, fp, len);
936 for (i = 0; i < nel; i++) {
937 rc = perm_read(p, comdatum->permissions.table, fp);
942 rc = hashtab_insert(h, key, comdatum);
948 common_destroy(key, comdatum, NULL);
952 static int read_cons_helper(struct constraint_node **nodep, int ncons,
953 int allowxtarget, void *fp)
955 struct constraint_node *c, *lc;
956 struct constraint_expr *e, *le;
962 for (i = 0; i < ncons; i++) {
963 c = kzalloc(sizeof(*c), GFP_KERNEL);
973 rc = next_entry(buf, fp, (sizeof(u32) * 2));
976 c->permissions = le32_to_cpu(buf[0]);
977 nexpr = le32_to_cpu(buf[1]);
980 for (j = 0; j < nexpr; j++) {
981 e = kzalloc(sizeof(*e), GFP_KERNEL);
991 rc = next_entry(buf, fp, (sizeof(u32) * 3));
994 e->expr_type = le32_to_cpu(buf[0]);
995 e->attr = le32_to_cpu(buf[1]);
996 e->op = le32_to_cpu(buf[2]);
998 switch (e->expr_type) {
1010 if (depth == (CEXPR_MAXDEPTH - 1))
1015 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1017 if (depth == (CEXPR_MAXDEPTH - 1))
1020 if (ebitmap_read(&e->names, fp))
1036 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1039 struct class_datum *cladatum;
1041 u32 len, len2, ncons, nel;
1044 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1050 rc = next_entry(buf, fp, sizeof(u32)*6);
1054 len = le32_to_cpu(buf[0]);
1055 len2 = le32_to_cpu(buf[1]);
1056 cladatum->value = le32_to_cpu(buf[2]);
1058 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1061 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1062 nel = le32_to_cpu(buf[4]);
1064 ncons = le32_to_cpu(buf[5]);
1066 key = kmalloc(len + 1,GFP_KERNEL);
1071 rc = next_entry(key, fp, len);
1077 cladatum->comkey = kmalloc(len2 + 1,GFP_KERNEL);
1078 if (!cladatum->comkey) {
1082 rc = next_entry(cladatum->comkey, fp, len2);
1085 cladatum->comkey[len2] = 0;
1087 cladatum->comdatum = hashtab_search(p->p_commons.table,
1089 if (!cladatum->comdatum) {
1090 printk(KERN_ERR "security: unknown common %s\n",
1096 for (i = 0; i < nel; i++) {
1097 rc = perm_read(p, cladatum->permissions.table, fp);
1102 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1106 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1107 /* grab the validatetrans rules */
1108 rc = next_entry(buf, fp, sizeof(u32));
1111 ncons = le32_to_cpu(buf[0]);
1112 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1117 rc = hashtab_insert(h, key, cladatum);
1125 class_destroy(key, cladatum, NULL);
1129 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1132 struct role_datum *role;
1137 role = kzalloc(sizeof(*role), GFP_KERNEL);
1143 rc = next_entry(buf, fp, sizeof buf);
1147 len = le32_to_cpu(buf[0]);
1148 role->value = le32_to_cpu(buf[1]);
1150 key = kmalloc(len + 1,GFP_KERNEL);
1155 rc = next_entry(key, fp, len);
1160 rc = ebitmap_read(&role->dominates, fp);
1164 rc = ebitmap_read(&role->types, fp);
1168 if (strcmp(key, OBJECT_R) == 0) {
1169 if (role->value != OBJECT_R_VAL) {
1170 printk(KERN_ERR "Role %s has wrong value %d\n",
1171 OBJECT_R, role->value);
1179 rc = hashtab_insert(h, key, role);
1185 role_destroy(key, role, NULL);
1189 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1192 struct type_datum *typdatum;
1197 typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
1203 rc = next_entry(buf, fp, sizeof buf);
1207 len = le32_to_cpu(buf[0]);
1208 typdatum->value = le32_to_cpu(buf[1]);
1209 typdatum->primary = le32_to_cpu(buf[2]);
1211 key = kmalloc(len + 1,GFP_KERNEL);
1216 rc = next_entry(key, fp, len);
1221 rc = hashtab_insert(h, key, typdatum);
1227 type_destroy(key, typdatum, NULL);
1233 * Read a MLS level structure from a policydb binary
1234 * representation file.
1236 static int mls_read_level(struct mls_level *lp, void *fp)
1241 memset(lp, 0, sizeof(*lp));
1243 rc = next_entry(buf, fp, sizeof buf);
1245 printk(KERN_ERR "security: mls: truncated level\n");
1248 lp->sens = le32_to_cpu(buf[0]);
1250 if (ebitmap_read(&lp->cat, fp)) {
1251 printk(KERN_ERR "security: mls: error reading level "
1261 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1264 struct user_datum *usrdatum;
1269 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1275 rc = next_entry(buf, fp, sizeof buf);
1279 len = le32_to_cpu(buf[0]);
1280 usrdatum->value = le32_to_cpu(buf[1]);
1282 key = kmalloc(len + 1,GFP_KERNEL);
1287 rc = next_entry(key, fp, len);
1292 rc = ebitmap_read(&usrdatum->roles, fp);
1296 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1297 rc = mls_read_range_helper(&usrdatum->range, fp);
1300 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1305 rc = hashtab_insert(h, key, usrdatum);
1311 user_destroy(key, usrdatum, NULL);
1315 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1318 struct level_datum *levdatum;
1323 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1329 rc = next_entry(buf, fp, sizeof buf);
1333 len = le32_to_cpu(buf[0]);
1334 levdatum->isalias = le32_to_cpu(buf[1]);
1336 key = kmalloc(len + 1,GFP_ATOMIC);
1341 rc = next_entry(key, fp, len);
1346 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1347 if (!levdatum->level) {
1351 if (mls_read_level(levdatum->level, fp)) {
1356 rc = hashtab_insert(h, key, levdatum);
1362 sens_destroy(key, levdatum, NULL);
1366 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1369 struct cat_datum *catdatum;
1374 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1380 rc = next_entry(buf, fp, sizeof buf);
1384 len = le32_to_cpu(buf[0]);
1385 catdatum->value = le32_to_cpu(buf[1]);
1386 catdatum->isalias = le32_to_cpu(buf[2]);
1388 key = kmalloc(len + 1,GFP_ATOMIC);
1393 rc = next_entry(key, fp, len);
1398 rc = hashtab_insert(h, key, catdatum);
1405 cat_destroy(key, catdatum, NULL);
1409 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1421 extern int ss_initialized;
1424 * Read the configuration data from a policy database binary
1425 * representation file into a policy database structure.
1427 int policydb_read(struct policydb *p, void *fp)
1429 struct role_allow *ra, *lra;
1430 struct role_trans *tr, *ltr;
1431 struct ocontext *l, *c, *newc;
1432 struct genfs *genfs_p, *genfs, *newgenfs;
1435 u32 len, len2, config, nprim, nel, nel2;
1437 struct policydb_compat_info *info;
1438 struct range_trans *rt, *lrt;
1442 rc = policydb_init(p);
1446 /* Read the magic number and string length. */
1447 rc = next_entry(buf, fp, sizeof(u32)* 2);
1451 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1452 printk(KERN_ERR "security: policydb magic number 0x%x does "
1453 "not match expected magic number 0x%x\n",
1454 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1458 len = le32_to_cpu(buf[1]);
1459 if (len != strlen(POLICYDB_STRING)) {
1460 printk(KERN_ERR "security: policydb string length %d does not "
1461 "match expected length %Zu\n",
1462 len, strlen(POLICYDB_STRING));
1465 policydb_str = kmalloc(len + 1,GFP_KERNEL);
1466 if (!policydb_str) {
1467 printk(KERN_ERR "security: unable to allocate memory for policydb "
1468 "string of length %d\n", len);
1472 rc = next_entry(policydb_str, fp, len);
1474 printk(KERN_ERR "security: truncated policydb string identifier\n");
1475 kfree(policydb_str);
1478 policydb_str[len] = 0;
1479 if (strcmp(policydb_str, POLICYDB_STRING)) {
1480 printk(KERN_ERR "security: policydb string %s does not match "
1481 "my string %s\n", policydb_str, POLICYDB_STRING);
1482 kfree(policydb_str);
1485 /* Done with policydb_str. */
1486 kfree(policydb_str);
1487 policydb_str = NULL;
1489 /* Read the version, config, and table sizes. */
1490 rc = next_entry(buf, fp, sizeof(u32)*4);
1494 p->policyvers = le32_to_cpu(buf[0]);
1495 if (p->policyvers < POLICYDB_VERSION_MIN ||
1496 p->policyvers > POLICYDB_VERSION_MAX) {
1497 printk(KERN_ERR "security: policydb version %d does not match "
1498 "my version range %d-%d\n",
1499 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1503 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1504 if (ss_initialized && !selinux_mls_enabled) {
1505 printk(KERN_ERR "Cannot switch between non-MLS and MLS "
1509 selinux_mls_enabled = 1;
1510 config |= POLICYDB_CONFIG_MLS;
1512 if (p->policyvers < POLICYDB_VERSION_MLS) {
1513 printk(KERN_ERR "security policydb version %d (MLS) "
1514 "not backwards compatible\n", p->policyvers);
1518 if (ss_initialized && selinux_mls_enabled) {
1519 printk(KERN_ERR "Cannot switch between MLS and non-MLS "
1525 info = policydb_lookup_compat(p->policyvers);
1527 printk(KERN_ERR "security: unable to find policy compat info "
1528 "for version %d\n", p->policyvers);
1532 if (le32_to_cpu(buf[2]) != info->sym_num ||
1533 le32_to_cpu(buf[3]) != info->ocon_num) {
1534 printk(KERN_ERR "security: policydb table sizes (%d,%d) do "
1535 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1536 le32_to_cpu(buf[3]),
1537 info->sym_num, info->ocon_num);
1541 for (i = 0; i < info->sym_num; i++) {
1542 rc = next_entry(buf, fp, sizeof(u32)*2);
1545 nprim = le32_to_cpu(buf[0]);
1546 nel = le32_to_cpu(buf[1]);
1547 for (j = 0; j < nel; j++) {
1548 rc = read_f[i](p, p->symtab[i].table, fp);
1553 p->symtab[i].nprim = nprim;
1556 rc = avtab_read(&p->te_avtab, fp, p->policyvers);
1560 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1561 rc = cond_read_list(p, fp);
1566 rc = next_entry(buf, fp, sizeof(u32));
1569 nel = le32_to_cpu(buf[0]);
1571 for (i = 0; i < nel; i++) {
1572 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1582 rc = next_entry(buf, fp, sizeof(u32)*3);
1585 tr->role = le32_to_cpu(buf[0]);
1586 tr->type = le32_to_cpu(buf[1]);
1587 tr->new_role = le32_to_cpu(buf[2]);
1591 rc = next_entry(buf, fp, sizeof(u32));
1594 nel = le32_to_cpu(buf[0]);
1596 for (i = 0; i < nel; i++) {
1597 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1607 rc = next_entry(buf, fp, sizeof(u32)*2);
1610 ra->role = le32_to_cpu(buf[0]);
1611 ra->new_role = le32_to_cpu(buf[1]);
1615 rc = policydb_index_classes(p);
1619 rc = policydb_index_others(p);
1623 for (i = 0; i < info->ocon_num; i++) {
1624 rc = next_entry(buf, fp, sizeof(u32));
1627 nel = le32_to_cpu(buf[0]);
1629 for (j = 0; j < nel; j++) {
1630 c = kzalloc(sizeof(*c), GFP_KERNEL);
1638 p->ocontexts[i] = c;
1644 rc = next_entry(buf, fp, sizeof(u32));
1647 c->sid[0] = le32_to_cpu(buf[0]);
1648 rc = context_read_and_validate(&c->context[0], p, fp);
1654 rc = next_entry(buf, fp, sizeof(u32));
1657 len = le32_to_cpu(buf[0]);
1658 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1663 rc = next_entry(c->u.name, fp, len);
1667 rc = context_read_and_validate(&c->context[0], p, fp);
1670 rc = context_read_and_validate(&c->context[1], p, fp);
1675 rc = next_entry(buf, fp, sizeof(u32)*3);
1678 c->u.port.protocol = le32_to_cpu(buf[0]);
1679 c->u.port.low_port = le32_to_cpu(buf[1]);
1680 c->u.port.high_port = le32_to_cpu(buf[2]);
1681 rc = context_read_and_validate(&c->context[0], p, fp);
1686 rc = next_entry(buf, fp, sizeof(u32)* 2);
1689 c->u.node.addr = le32_to_cpu(buf[0]);
1690 c->u.node.mask = le32_to_cpu(buf[1]);
1691 rc = context_read_and_validate(&c->context[0], p, fp);
1696 rc = next_entry(buf, fp, sizeof(u32)*2);
1699 c->v.behavior = le32_to_cpu(buf[0]);
1700 if (c->v.behavior > SECURITY_FS_USE_NONE)
1702 len = le32_to_cpu(buf[1]);
1703 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1708 rc = next_entry(c->u.name, fp, len);
1712 rc = context_read_and_validate(&c->context[0], p, fp);
1719 rc = next_entry(buf, fp, sizeof(u32) * 8);
1722 for (k = 0; k < 4; k++)
1723 c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1724 for (k = 0; k < 4; k++)
1725 c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1726 if (context_read_and_validate(&c->context[0], p, fp))
1734 rc = next_entry(buf, fp, sizeof(u32));
1737 nel = le32_to_cpu(buf[0]);
1740 for (i = 0; i < nel; i++) {
1741 rc = next_entry(buf, fp, sizeof(u32));
1744 len = le32_to_cpu(buf[0]);
1745 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1751 newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
1752 if (!newgenfs->fstype) {
1757 rc = next_entry(newgenfs->fstype, fp, len);
1759 kfree(newgenfs->fstype);
1763 newgenfs->fstype[len] = 0;
1764 for (genfs_p = NULL, genfs = p->genfs; genfs;
1765 genfs_p = genfs, genfs = genfs->next) {
1766 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1767 printk(KERN_ERR "security: dup genfs "
1768 "fstype %s\n", newgenfs->fstype);
1769 kfree(newgenfs->fstype);
1773 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1776 newgenfs->next = genfs;
1778 genfs_p->next = newgenfs;
1780 p->genfs = newgenfs;
1781 rc = next_entry(buf, fp, sizeof(u32));
1784 nel2 = le32_to_cpu(buf[0]);
1785 for (j = 0; j < nel2; j++) {
1786 rc = next_entry(buf, fp, sizeof(u32));
1789 len = le32_to_cpu(buf[0]);
1791 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1797 newc->u.name = kmalloc(len + 1,GFP_KERNEL);
1798 if (!newc->u.name) {
1802 rc = next_entry(newc->u.name, fp, len);
1805 newc->u.name[len] = 0;
1806 rc = next_entry(buf, fp, sizeof(u32));
1809 newc->v.sclass = le32_to_cpu(buf[0]);
1810 if (context_read_and_validate(&newc->context[0], p, fp))
1812 for (l = NULL, c = newgenfs->head; c;
1813 l = c, c = c->next) {
1814 if (!strcmp(newc->u.name, c->u.name) &&
1815 (!c->v.sclass || !newc->v.sclass ||
1816 newc->v.sclass == c->v.sclass)) {
1817 printk(KERN_ERR "security: dup genfs "
1819 newgenfs->fstype, c->u.name);
1822 len = strlen(newc->u.name);
1823 len2 = strlen(c->u.name);
1832 newgenfs->head = newc;
1836 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1837 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1838 rc = next_entry(buf, fp, sizeof(u32));
1841 nel = le32_to_cpu(buf[0]);
1843 for (i = 0; i < nel; i++) {
1844 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1853 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1856 rt->source_type = le32_to_cpu(buf[0]);
1857 rt->target_type = le32_to_cpu(buf[1]);
1859 rc = next_entry(buf, fp, sizeof(u32));
1862 rt->target_class = le32_to_cpu(buf[0]);
1864 rt->target_class = SECCLASS_PROCESS;
1865 rc = mls_read_range_helper(&rt->target_range, fp);
1872 p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1873 if (!p->type_attr_map)
1876 for (i = 0; i < p->p_types.nprim; i++) {
1877 ebitmap_init(&p->type_attr_map[i]);
1878 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1879 if (ebitmap_read(&p->type_attr_map[i], fp))
1882 /* add the type itself as the degenerate case */
1883 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1891 ocontext_destroy(newc,OCON_FSUSE);
1895 policydb_destroy(p);