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/sched.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27 #include <linux/errno.h>
31 #include "conditional.h"
37 static char *symtab_name[SYM_NUM] = {
49 int selinux_mls_enabled = 0;
51 static unsigned int symtab_sizes[SYM_NUM] = {
62 struct policydb_compat_info {
68 /* These need to be updated if SYM_NUM or OCON_NUM changes */
69 static struct policydb_compat_info policydb_compat[] = {
71 .version = POLICYDB_VERSION_BASE,
72 .sym_num = SYM_NUM - 3,
73 .ocon_num = OCON_NUM - 1,
76 .version = POLICYDB_VERSION_BOOL,
77 .sym_num = SYM_NUM - 2,
78 .ocon_num = OCON_NUM - 1,
81 .version = POLICYDB_VERSION_IPV6,
82 .sym_num = SYM_NUM - 2,
86 .version = POLICYDB_VERSION_NLCLASS,
87 .sym_num = SYM_NUM - 2,
91 .version = POLICYDB_VERSION_MLS,
96 .version = POLICYDB_VERSION_AVTAB,
101 .version = POLICYDB_VERSION_RANGETRANS,
103 .ocon_num = OCON_NUM,
107 static struct policydb_compat_info *policydb_lookup_compat(int version)
110 struct policydb_compat_info *info = NULL;
112 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
113 if (policydb_compat[i].version == version) {
114 info = &policydb_compat[i];
122 * Initialize the role table.
124 static int roles_init(struct policydb *p)
128 struct role_datum *role;
130 role = kzalloc(sizeof(*role), GFP_KERNEL);
135 role->value = ++p->p_roles.nprim;
136 if (role->value != OBJECT_R_VAL) {
140 key = kmalloc(strlen(OBJECT_R)+1,GFP_KERNEL);
145 strcpy(key, OBJECT_R);
146 rc = hashtab_insert(p->p_roles.table, key, role);
160 * Initialize a policy database structure.
162 static int policydb_init(struct policydb *p)
166 memset(p, 0, sizeof(*p));
168 for (i = 0; i < SYM_NUM; i++) {
169 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
171 goto out_free_symtab;
174 rc = avtab_init(&p->te_avtab);
176 goto out_free_symtab;
180 goto out_free_symtab;
182 rc = cond_policydb_init(p);
184 goto out_free_symtab;
190 for (i = 0; i < SYM_NUM; i++)
191 hashtab_destroy(p->symtab[i].table);
196 * The following *_index functions are used to
197 * define the val_to_name and val_to_struct arrays
198 * in a policy database structure. The val_to_name
199 * arrays are used when converting security context
200 * structures into string representations. The
201 * val_to_struct arrays are used when the attributes
202 * of a class, role, or user are needed.
205 static int common_index(void *key, void *datum, void *datap)
208 struct common_datum *comdatum;
212 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
214 p->p_common_val_to_name[comdatum->value - 1] = key;
218 static int class_index(void *key, void *datum, void *datap)
221 struct class_datum *cladatum;
225 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
227 p->p_class_val_to_name[cladatum->value - 1] = key;
228 p->class_val_to_struct[cladatum->value - 1] = cladatum;
232 static int role_index(void *key, void *datum, void *datap)
235 struct role_datum *role;
239 if (!role->value || role->value > p->p_roles.nprim)
241 p->p_role_val_to_name[role->value - 1] = key;
242 p->role_val_to_struct[role->value - 1] = role;
246 static int type_index(void *key, void *datum, void *datap)
249 struct type_datum *typdatum;
254 if (typdatum->primary) {
255 if (!typdatum->value || typdatum->value > p->p_types.nprim)
257 p->p_type_val_to_name[typdatum->value - 1] = key;
263 static int user_index(void *key, void *datum, void *datap)
266 struct user_datum *usrdatum;
270 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
272 p->p_user_val_to_name[usrdatum->value - 1] = key;
273 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
277 static int sens_index(void *key, void *datum, void *datap)
280 struct level_datum *levdatum;
285 if (!levdatum->isalias) {
286 if (!levdatum->level->sens ||
287 levdatum->level->sens > p->p_levels.nprim)
289 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
295 static int cat_index(void *key, void *datum, void *datap)
298 struct cat_datum *catdatum;
303 if (!catdatum->isalias) {
304 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
306 p->p_cat_val_to_name[catdatum->value - 1] = key;
312 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
325 * Define the common val_to_name array and the class
326 * val_to_name and val_to_struct arrays in a policy
327 * database structure.
329 * Caller must clean up upon failure.
331 static int policydb_index_classes(struct policydb *p)
335 p->p_common_val_to_name =
336 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
337 if (!p->p_common_val_to_name) {
342 rc = hashtab_map(p->p_commons.table, common_index, p);
346 p->class_val_to_struct =
347 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
348 if (!p->class_val_to_struct) {
353 p->p_class_val_to_name =
354 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
355 if (!p->p_class_val_to_name) {
360 rc = hashtab_map(p->p_classes.table, class_index, p);
366 static void symtab_hash_eval(struct symtab *s)
370 for (i = 0; i < SYM_NUM; i++) {
371 struct hashtab *h = s[i].table;
372 struct hashtab_info info;
374 hashtab_stat(h, &info);
375 printk(KERN_DEBUG "%s: %d entries and %d/%d buckets used, "
376 "longest chain length %d\n", symtab_name[i], h->nel,
377 info.slots_used, h->size, info.max_chain_len);
383 * Define the other val_to_name and val_to_struct arrays
384 * in a policy database structure.
386 * Caller must clean up on failure.
388 static int policydb_index_others(struct policydb *p)
392 printk(KERN_DEBUG "security: %d users, %d roles, %d types, %d bools",
393 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
394 if (selinux_mls_enabled)
395 printk(", %d sens, %d cats", p->p_levels.nprim,
399 printk(KERN_DEBUG "security: %d classes, %d rules\n",
400 p->p_classes.nprim, p->te_avtab.nel);
403 avtab_hash_eval(&p->te_avtab, "rules");
404 symtab_hash_eval(p->symtab);
407 p->role_val_to_struct =
408 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
410 if (!p->role_val_to_struct) {
415 p->user_val_to_struct =
416 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
418 if (!p->user_val_to_struct) {
423 if (cond_init_bool_indexes(p)) {
428 for (i = SYM_ROLES; i < SYM_NUM; i++) {
429 p->sym_val_to_name[i] =
430 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
431 if (!p->sym_val_to_name[i]) {
435 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
445 * The following *_destroy functions are used to
446 * free any memory allocated for each kind of
447 * symbol data in the policy database.
450 static int perm_destroy(void *key, void *datum, void *p)
457 static int common_destroy(void *key, void *datum, void *p)
459 struct common_datum *comdatum;
463 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
464 hashtab_destroy(comdatum->permissions.table);
469 static int cls_destroy(void *key, void *datum, void *p)
471 struct class_datum *cladatum;
472 struct constraint_node *constraint, *ctemp;
473 struct constraint_expr *e, *etmp;
477 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
478 hashtab_destroy(cladatum->permissions.table);
479 constraint = cladatum->constraints;
481 e = constraint->expr;
483 ebitmap_destroy(&e->names);
489 constraint = constraint->next;
493 constraint = cladatum->validatetrans;
495 e = constraint->expr;
497 ebitmap_destroy(&e->names);
503 constraint = constraint->next;
507 kfree(cladatum->comkey);
512 static int role_destroy(void *key, void *datum, void *p)
514 struct role_datum *role;
518 ebitmap_destroy(&role->dominates);
519 ebitmap_destroy(&role->types);
524 static int type_destroy(void *key, void *datum, void *p)
531 static int user_destroy(void *key, void *datum, void *p)
533 struct user_datum *usrdatum;
537 ebitmap_destroy(&usrdatum->roles);
538 ebitmap_destroy(&usrdatum->range.level[0].cat);
539 ebitmap_destroy(&usrdatum->range.level[1].cat);
540 ebitmap_destroy(&usrdatum->dfltlevel.cat);
545 static int sens_destroy(void *key, void *datum, void *p)
547 struct level_datum *levdatum;
551 ebitmap_destroy(&levdatum->level->cat);
552 kfree(levdatum->level);
557 static int cat_destroy(void *key, void *datum, void *p)
564 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
576 static void ocontext_destroy(struct ocontext *c, int i)
578 context_destroy(&c->context[0]);
579 context_destroy(&c->context[1]);
580 if (i == OCON_ISID || i == OCON_FS ||
581 i == OCON_NETIF || i == OCON_FSUSE)
587 * Free any memory allocated by a policy database structure.
589 void policydb_destroy(struct policydb *p)
591 struct ocontext *c, *ctmp;
592 struct genfs *g, *gtmp;
594 struct role_allow *ra, *lra = NULL;
595 struct role_trans *tr, *ltr = NULL;
596 struct range_trans *rt, *lrt = NULL;
598 for (i = 0; i < SYM_NUM; i++) {
600 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
601 hashtab_destroy(p->symtab[i].table);
604 for (i = 0; i < SYM_NUM; i++)
605 kfree(p->sym_val_to_name[i]);
607 kfree(p->class_val_to_struct);
608 kfree(p->role_val_to_struct);
609 kfree(p->user_val_to_struct);
611 avtab_destroy(&p->te_avtab);
613 for (i = 0; i < OCON_NUM; i++) {
619 ocontext_destroy(ctmp,i);
621 p->ocontexts[i] = NULL;
632 ocontext_destroy(ctmp,OCON_FSUSE);
640 cond_policydb_destroy(p);
642 for (tr = p->role_tr; tr; tr = tr->next) {
649 for (ra = p->role_allow; ra; ra = ra -> next) {
656 for (rt = p->range_tr; rt; rt = rt -> next) {
659 ebitmap_destroy(&lrt->target_range.level[0].cat);
660 ebitmap_destroy(&lrt->target_range.level[1].cat);
666 ebitmap_destroy(&lrt->target_range.level[0].cat);
667 ebitmap_destroy(&lrt->target_range.level[1].cat);
671 if (p->type_attr_map) {
672 for (i = 0; i < p->p_types.nprim; i++)
673 ebitmap_destroy(&p->type_attr_map[i]);
675 kfree(p->type_attr_map);
677 kfree(p->undefined_perms);
683 * Load the initial SIDs specified in a policy database
684 * structure into a SID table.
686 int policydb_load_isids(struct policydb *p, struct sidtab *s)
688 struct ocontext *head, *c;
693 printk(KERN_ERR "security: out of memory on SID table init\n");
697 head = p->ocontexts[OCON_ISID];
698 for (c = head; c; c = c->next) {
699 if (!c->context[0].user) {
700 printk(KERN_ERR "security: SID %s was never "
701 "defined.\n", c->u.name);
705 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
706 printk(KERN_ERR "security: unable to load initial "
707 "SID %s.\n", c->u.name);
717 * Return 1 if the fields in the security context
718 * structure `c' are valid. Return 0 otherwise.
720 int policydb_context_isvalid(struct policydb *p, struct context *c)
722 struct role_datum *role;
723 struct user_datum *usrdatum;
725 if (!c->role || c->role > p->p_roles.nprim)
728 if (!c->user || c->user > p->p_users.nprim)
731 if (!c->type || c->type > p->p_types.nprim)
734 if (c->role != OBJECT_R_VAL) {
736 * Role must be authorized for the type.
738 role = p->role_val_to_struct[c->role - 1];
739 if (!ebitmap_get_bit(&role->types,
741 /* role may not be associated with type */
745 * User must be authorized for the role.
747 usrdatum = p->user_val_to_struct[c->user - 1];
751 if (!ebitmap_get_bit(&usrdatum->roles,
753 /* user may not be associated with role */
757 if (!mls_context_isvalid(p, c))
764 * Read a MLS range structure from a policydb binary
765 * representation file.
767 static int mls_read_range_helper(struct mls_range *r, void *fp)
773 rc = next_entry(buf, fp, sizeof(u32));
777 items = le32_to_cpu(buf[0]);
778 if (items > ARRAY_SIZE(buf)) {
779 printk(KERN_ERR "security: mls: range overflow\n");
783 rc = next_entry(buf, fp, sizeof(u32) * items);
785 printk(KERN_ERR "security: mls: truncated range\n");
788 r->level[0].sens = le32_to_cpu(buf[0]);
790 r->level[1].sens = le32_to_cpu(buf[1]);
792 r->level[1].sens = r->level[0].sens;
794 rc = ebitmap_read(&r->level[0].cat, fp);
796 printk(KERN_ERR "security: mls: error reading low "
801 rc = ebitmap_read(&r->level[1].cat, fp);
803 printk(KERN_ERR "security: mls: error reading high "
808 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
810 printk(KERN_ERR "security: mls: out of memory\n");
819 ebitmap_destroy(&r->level[0].cat);
824 * Read and validate a security context structure
825 * from a policydb binary representation file.
827 static int context_read_and_validate(struct context *c,
834 rc = next_entry(buf, fp, sizeof buf);
836 printk(KERN_ERR "security: context truncated\n");
839 c->user = le32_to_cpu(buf[0]);
840 c->role = le32_to_cpu(buf[1]);
841 c->type = le32_to_cpu(buf[2]);
842 if (p->policyvers >= POLICYDB_VERSION_MLS) {
843 if (mls_read_range_helper(&c->range, fp)) {
844 printk(KERN_ERR "security: error reading MLS range of "
851 if (!policydb_context_isvalid(p, c)) {
852 printk(KERN_ERR "security: invalid security context\n");
861 * The following *_read functions are used to
862 * read the symbol data from a policy database
863 * binary representation file.
866 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
869 struct perm_datum *perdatum;
874 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
880 rc = next_entry(buf, fp, sizeof buf);
884 len = le32_to_cpu(buf[0]);
885 perdatum->value = le32_to_cpu(buf[1]);
887 key = kmalloc(len + 1,GFP_KERNEL);
892 rc = next_entry(key, fp, len);
897 rc = hashtab_insert(h, key, perdatum);
903 perm_destroy(key, perdatum, NULL);
907 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
910 struct common_datum *comdatum;
915 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
921 rc = next_entry(buf, fp, sizeof buf);
925 len = le32_to_cpu(buf[0]);
926 comdatum->value = le32_to_cpu(buf[1]);
928 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
931 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
932 nel = le32_to_cpu(buf[3]);
934 key = kmalloc(len + 1,GFP_KERNEL);
939 rc = next_entry(key, fp, len);
944 for (i = 0; i < nel; i++) {
945 rc = perm_read(p, comdatum->permissions.table, fp);
950 rc = hashtab_insert(h, key, comdatum);
956 common_destroy(key, comdatum, NULL);
960 static int read_cons_helper(struct constraint_node **nodep, int ncons,
961 int allowxtarget, void *fp)
963 struct constraint_node *c, *lc;
964 struct constraint_expr *e, *le;
970 for (i = 0; i < ncons; i++) {
971 c = kzalloc(sizeof(*c), GFP_KERNEL);
981 rc = next_entry(buf, fp, (sizeof(u32) * 2));
984 c->permissions = le32_to_cpu(buf[0]);
985 nexpr = le32_to_cpu(buf[1]);
988 for (j = 0; j < nexpr; j++) {
989 e = kzalloc(sizeof(*e), GFP_KERNEL);
999 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1002 e->expr_type = le32_to_cpu(buf[0]);
1003 e->attr = le32_to_cpu(buf[1]);
1004 e->op = le32_to_cpu(buf[2]);
1006 switch (e->expr_type) {
1018 if (depth == (CEXPR_MAXDEPTH - 1))
1023 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1025 if (depth == (CEXPR_MAXDEPTH - 1))
1028 if (ebitmap_read(&e->names, fp))
1044 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1047 struct class_datum *cladatum;
1049 u32 len, len2, ncons, nel;
1052 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1058 rc = next_entry(buf, fp, sizeof(u32)*6);
1062 len = le32_to_cpu(buf[0]);
1063 len2 = le32_to_cpu(buf[1]);
1064 cladatum->value = le32_to_cpu(buf[2]);
1066 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1069 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1070 nel = le32_to_cpu(buf[4]);
1072 ncons = le32_to_cpu(buf[5]);
1074 key = kmalloc(len + 1,GFP_KERNEL);
1079 rc = next_entry(key, fp, len);
1085 cladatum->comkey = kmalloc(len2 + 1,GFP_KERNEL);
1086 if (!cladatum->comkey) {
1090 rc = next_entry(cladatum->comkey, fp, len2);
1093 cladatum->comkey[len2] = 0;
1095 cladatum->comdatum = hashtab_search(p->p_commons.table,
1097 if (!cladatum->comdatum) {
1098 printk(KERN_ERR "security: unknown common %s\n",
1104 for (i = 0; i < nel; i++) {
1105 rc = perm_read(p, cladatum->permissions.table, fp);
1110 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1114 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1115 /* grab the validatetrans rules */
1116 rc = next_entry(buf, fp, sizeof(u32));
1119 ncons = le32_to_cpu(buf[0]);
1120 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1125 rc = hashtab_insert(h, key, cladatum);
1133 cls_destroy(key, cladatum, NULL);
1137 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1140 struct role_datum *role;
1145 role = kzalloc(sizeof(*role), GFP_KERNEL);
1151 rc = next_entry(buf, fp, sizeof buf);
1155 len = le32_to_cpu(buf[0]);
1156 role->value = le32_to_cpu(buf[1]);
1158 key = kmalloc(len + 1,GFP_KERNEL);
1163 rc = next_entry(key, fp, len);
1168 rc = ebitmap_read(&role->dominates, fp);
1172 rc = ebitmap_read(&role->types, fp);
1176 if (strcmp(key, OBJECT_R) == 0) {
1177 if (role->value != OBJECT_R_VAL) {
1178 printk(KERN_ERR "Role %s has wrong value %d\n",
1179 OBJECT_R, role->value);
1187 rc = hashtab_insert(h, key, role);
1193 role_destroy(key, role, NULL);
1197 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1200 struct type_datum *typdatum;
1205 typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
1211 rc = next_entry(buf, fp, sizeof buf);
1215 len = le32_to_cpu(buf[0]);
1216 typdatum->value = le32_to_cpu(buf[1]);
1217 typdatum->primary = le32_to_cpu(buf[2]);
1219 key = kmalloc(len + 1,GFP_KERNEL);
1224 rc = next_entry(key, fp, len);
1229 rc = hashtab_insert(h, key, typdatum);
1235 type_destroy(key, typdatum, NULL);
1241 * Read a MLS level structure from a policydb binary
1242 * representation file.
1244 static int mls_read_level(struct mls_level *lp, void *fp)
1249 memset(lp, 0, sizeof(*lp));
1251 rc = next_entry(buf, fp, sizeof buf);
1253 printk(KERN_ERR "security: mls: truncated level\n");
1256 lp->sens = le32_to_cpu(buf[0]);
1258 if (ebitmap_read(&lp->cat, fp)) {
1259 printk(KERN_ERR "security: mls: error reading level "
1269 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1272 struct user_datum *usrdatum;
1277 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1283 rc = next_entry(buf, fp, sizeof buf);
1287 len = le32_to_cpu(buf[0]);
1288 usrdatum->value = le32_to_cpu(buf[1]);
1290 key = kmalloc(len + 1,GFP_KERNEL);
1295 rc = next_entry(key, fp, len);
1300 rc = ebitmap_read(&usrdatum->roles, fp);
1304 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1305 rc = mls_read_range_helper(&usrdatum->range, fp);
1308 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1313 rc = hashtab_insert(h, key, usrdatum);
1319 user_destroy(key, usrdatum, NULL);
1323 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1326 struct level_datum *levdatum;
1331 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1337 rc = next_entry(buf, fp, sizeof buf);
1341 len = le32_to_cpu(buf[0]);
1342 levdatum->isalias = le32_to_cpu(buf[1]);
1344 key = kmalloc(len + 1,GFP_ATOMIC);
1349 rc = next_entry(key, fp, len);
1354 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1355 if (!levdatum->level) {
1359 if (mls_read_level(levdatum->level, fp)) {
1364 rc = hashtab_insert(h, key, levdatum);
1370 sens_destroy(key, levdatum, NULL);
1374 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1377 struct cat_datum *catdatum;
1382 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1388 rc = next_entry(buf, fp, sizeof buf);
1392 len = le32_to_cpu(buf[0]);
1393 catdatum->value = le32_to_cpu(buf[1]);
1394 catdatum->isalias = le32_to_cpu(buf[2]);
1396 key = kmalloc(len + 1,GFP_ATOMIC);
1401 rc = next_entry(key, fp, len);
1406 rc = hashtab_insert(h, key, catdatum);
1413 cat_destroy(key, catdatum, NULL);
1417 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1429 extern int ss_initialized;
1432 * Read the configuration data from a policy database binary
1433 * representation file into a policy database structure.
1435 int policydb_read(struct policydb *p, void *fp)
1437 struct role_allow *ra, *lra;
1438 struct role_trans *tr, *ltr;
1439 struct ocontext *l, *c, *newc;
1440 struct genfs *genfs_p, *genfs, *newgenfs;
1443 u32 len, len2, config, nprim, nel, nel2;
1445 struct policydb_compat_info *info;
1446 struct range_trans *rt, *lrt;
1450 rc = policydb_init(p);
1454 /* Read the magic number and string length. */
1455 rc = next_entry(buf, fp, sizeof(u32)* 2);
1459 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1460 printk(KERN_ERR "security: policydb magic number 0x%x does "
1461 "not match expected magic number 0x%x\n",
1462 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1466 len = le32_to_cpu(buf[1]);
1467 if (len != strlen(POLICYDB_STRING)) {
1468 printk(KERN_ERR "security: policydb string length %d does not "
1469 "match expected length %Zu\n",
1470 len, strlen(POLICYDB_STRING));
1473 policydb_str = kmalloc(len + 1,GFP_KERNEL);
1474 if (!policydb_str) {
1475 printk(KERN_ERR "security: unable to allocate memory for policydb "
1476 "string of length %d\n", len);
1480 rc = next_entry(policydb_str, fp, len);
1482 printk(KERN_ERR "security: truncated policydb string identifier\n");
1483 kfree(policydb_str);
1486 policydb_str[len] = 0;
1487 if (strcmp(policydb_str, POLICYDB_STRING)) {
1488 printk(KERN_ERR "security: policydb string %s does not match "
1489 "my string %s\n", policydb_str, POLICYDB_STRING);
1490 kfree(policydb_str);
1493 /* Done with policydb_str. */
1494 kfree(policydb_str);
1495 policydb_str = NULL;
1497 /* Read the version, config, and table sizes. */
1498 rc = next_entry(buf, fp, sizeof(u32)*4);
1502 p->policyvers = le32_to_cpu(buf[0]);
1503 if (p->policyvers < POLICYDB_VERSION_MIN ||
1504 p->policyvers > POLICYDB_VERSION_MAX) {
1505 printk(KERN_ERR "security: policydb version %d does not match "
1506 "my version range %d-%d\n",
1507 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1511 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1512 if (ss_initialized && !selinux_mls_enabled) {
1513 printk(KERN_ERR "Cannot switch between non-MLS and MLS "
1517 selinux_mls_enabled = 1;
1518 config |= POLICYDB_CONFIG_MLS;
1520 if (p->policyvers < POLICYDB_VERSION_MLS) {
1521 printk(KERN_ERR "security policydb version %d (MLS) "
1522 "not backwards compatible\n", p->policyvers);
1526 if (ss_initialized && selinux_mls_enabled) {
1527 printk(KERN_ERR "Cannot switch between MLS and non-MLS "
1532 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1533 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1535 info = policydb_lookup_compat(p->policyvers);
1537 printk(KERN_ERR "security: unable to find policy compat info "
1538 "for version %d\n", p->policyvers);
1542 if (le32_to_cpu(buf[2]) != info->sym_num ||
1543 le32_to_cpu(buf[3]) != info->ocon_num) {
1544 printk(KERN_ERR "security: policydb table sizes (%d,%d) do "
1545 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1546 le32_to_cpu(buf[3]),
1547 info->sym_num, info->ocon_num);
1551 for (i = 0; i < info->sym_num; i++) {
1552 rc = next_entry(buf, fp, sizeof(u32)*2);
1555 nprim = le32_to_cpu(buf[0]);
1556 nel = le32_to_cpu(buf[1]);
1557 for (j = 0; j < nel; j++) {
1558 rc = read_f[i](p, p->symtab[i].table, fp);
1563 p->symtab[i].nprim = nprim;
1566 rc = avtab_read(&p->te_avtab, fp, p->policyvers);
1570 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1571 rc = cond_read_list(p, fp);
1576 rc = next_entry(buf, fp, sizeof(u32));
1579 nel = le32_to_cpu(buf[0]);
1581 for (i = 0; i < nel; i++) {
1582 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1592 rc = next_entry(buf, fp, sizeof(u32)*3);
1595 tr->role = le32_to_cpu(buf[0]);
1596 tr->type = le32_to_cpu(buf[1]);
1597 tr->new_role = le32_to_cpu(buf[2]);
1601 rc = next_entry(buf, fp, sizeof(u32));
1604 nel = le32_to_cpu(buf[0]);
1606 for (i = 0; i < nel; i++) {
1607 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1617 rc = next_entry(buf, fp, sizeof(u32)*2);
1620 ra->role = le32_to_cpu(buf[0]);
1621 ra->new_role = le32_to_cpu(buf[1]);
1625 rc = policydb_index_classes(p);
1629 rc = policydb_index_others(p);
1633 for (i = 0; i < info->ocon_num; i++) {
1634 rc = next_entry(buf, fp, sizeof(u32));
1637 nel = le32_to_cpu(buf[0]);
1639 for (j = 0; j < nel; j++) {
1640 c = kzalloc(sizeof(*c), GFP_KERNEL);
1648 p->ocontexts[i] = c;
1654 rc = next_entry(buf, fp, sizeof(u32));
1657 c->sid[0] = le32_to_cpu(buf[0]);
1658 rc = context_read_and_validate(&c->context[0], p, fp);
1664 rc = next_entry(buf, fp, sizeof(u32));
1667 len = le32_to_cpu(buf[0]);
1668 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1673 rc = next_entry(c->u.name, fp, len);
1677 rc = context_read_and_validate(&c->context[0], p, fp);
1680 rc = context_read_and_validate(&c->context[1], p, fp);
1685 rc = next_entry(buf, fp, sizeof(u32)*3);
1688 c->u.port.protocol = le32_to_cpu(buf[0]);
1689 c->u.port.low_port = le32_to_cpu(buf[1]);
1690 c->u.port.high_port = le32_to_cpu(buf[2]);
1691 rc = context_read_and_validate(&c->context[0], p, fp);
1696 rc = next_entry(buf, fp, sizeof(u32)* 2);
1699 c->u.node.addr = le32_to_cpu(buf[0]);
1700 c->u.node.mask = le32_to_cpu(buf[1]);
1701 rc = context_read_and_validate(&c->context[0], p, fp);
1706 rc = next_entry(buf, fp, sizeof(u32)*2);
1709 c->v.behavior = le32_to_cpu(buf[0]);
1710 if (c->v.behavior > SECURITY_FS_USE_NONE)
1712 len = le32_to_cpu(buf[1]);
1713 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1718 rc = next_entry(c->u.name, fp, len);
1722 rc = context_read_and_validate(&c->context[0], p, fp);
1729 rc = next_entry(buf, fp, sizeof(u32) * 8);
1732 for (k = 0; k < 4; k++)
1733 c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1734 for (k = 0; k < 4; k++)
1735 c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1736 if (context_read_and_validate(&c->context[0], p, fp))
1744 rc = next_entry(buf, fp, sizeof(u32));
1747 nel = le32_to_cpu(buf[0]);
1750 for (i = 0; i < nel; i++) {
1751 rc = next_entry(buf, fp, sizeof(u32));
1754 len = le32_to_cpu(buf[0]);
1755 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1761 newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
1762 if (!newgenfs->fstype) {
1767 rc = next_entry(newgenfs->fstype, fp, len);
1769 kfree(newgenfs->fstype);
1773 newgenfs->fstype[len] = 0;
1774 for (genfs_p = NULL, genfs = p->genfs; genfs;
1775 genfs_p = genfs, genfs = genfs->next) {
1776 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1777 printk(KERN_ERR "security: dup genfs "
1778 "fstype %s\n", newgenfs->fstype);
1779 kfree(newgenfs->fstype);
1783 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1786 newgenfs->next = genfs;
1788 genfs_p->next = newgenfs;
1790 p->genfs = newgenfs;
1791 rc = next_entry(buf, fp, sizeof(u32));
1794 nel2 = le32_to_cpu(buf[0]);
1795 for (j = 0; j < nel2; j++) {
1796 rc = next_entry(buf, fp, sizeof(u32));
1799 len = le32_to_cpu(buf[0]);
1801 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1807 newc->u.name = kmalloc(len + 1,GFP_KERNEL);
1808 if (!newc->u.name) {
1812 rc = next_entry(newc->u.name, fp, len);
1815 newc->u.name[len] = 0;
1816 rc = next_entry(buf, fp, sizeof(u32));
1819 newc->v.sclass = le32_to_cpu(buf[0]);
1820 if (context_read_and_validate(&newc->context[0], p, fp))
1822 for (l = NULL, c = newgenfs->head; c;
1823 l = c, c = c->next) {
1824 if (!strcmp(newc->u.name, c->u.name) &&
1825 (!c->v.sclass || !newc->v.sclass ||
1826 newc->v.sclass == c->v.sclass)) {
1827 printk(KERN_ERR "security: dup genfs "
1829 newgenfs->fstype, c->u.name);
1832 len = strlen(newc->u.name);
1833 len2 = strlen(c->u.name);
1842 newgenfs->head = newc;
1846 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1847 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1848 rc = next_entry(buf, fp, sizeof(u32));
1851 nel = le32_to_cpu(buf[0]);
1853 for (i = 0; i < nel; i++) {
1854 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1863 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1866 rt->source_type = le32_to_cpu(buf[0]);
1867 rt->target_type = le32_to_cpu(buf[1]);
1869 rc = next_entry(buf, fp, sizeof(u32));
1872 rt->target_class = le32_to_cpu(buf[0]);
1874 rt->target_class = SECCLASS_PROCESS;
1875 rc = mls_read_range_helper(&rt->target_range, fp);
1882 p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1883 if (!p->type_attr_map)
1886 for (i = 0; i < p->p_types.nprim; i++) {
1887 ebitmap_init(&p->type_attr_map[i]);
1888 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1889 if (ebitmap_read(&p->type_attr_map[i], fp))
1892 /* add the type itself as the degenerate case */
1893 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1901 ocontext_destroy(newc,OCON_FSUSE);
1905 policydb_destroy(p);