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,
96 static struct policydb_compat_info *policydb_lookup_compat(int version)
99 struct policydb_compat_info *info = NULL;
101 for (i = 0; i < sizeof(policydb_compat)/sizeof(*info); i++) {
102 if (policydb_compat[i].version == version) {
103 info = &policydb_compat[i];
111 * Initialize the role table.
113 static int roles_init(struct policydb *p)
117 struct role_datum *role;
119 role = kmalloc(sizeof(*role), GFP_KERNEL);
124 memset(role, 0, sizeof(*role));
125 role->value = ++p->p_roles.nprim;
126 if (role->value != OBJECT_R_VAL) {
130 key = kmalloc(strlen(OBJECT_R)+1,GFP_KERNEL);
135 strcpy(key, OBJECT_R);
136 rc = hashtab_insert(p->p_roles.table, key, role);
150 * Initialize a policy database structure.
152 static int policydb_init(struct policydb *p)
156 memset(p, 0, sizeof(*p));
158 for (i = 0; i < SYM_NUM; i++) {
159 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
161 goto out_free_symtab;
164 rc = avtab_init(&p->te_avtab);
166 goto out_free_symtab;
172 rc = cond_policydb_init(p);
180 avtab_destroy(&p->te_avtab);
183 for (i = 0; i < SYM_NUM; i++)
184 hashtab_destroy(p->symtab[i].table);
189 * The following *_index functions are used to
190 * define the val_to_name and val_to_struct arrays
191 * in a policy database structure. The val_to_name
192 * arrays are used when converting security context
193 * structures into string representations. The
194 * val_to_struct arrays are used when the attributes
195 * of a class, role, or user are needed.
198 static int common_index(void *key, void *datum, void *datap)
201 struct common_datum *comdatum;
205 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
207 p->p_common_val_to_name[comdatum->value - 1] = key;
211 static int class_index(void *key, void *datum, void *datap)
214 struct class_datum *cladatum;
218 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
220 p->p_class_val_to_name[cladatum->value - 1] = key;
221 p->class_val_to_struct[cladatum->value - 1] = cladatum;
225 static int role_index(void *key, void *datum, void *datap)
228 struct role_datum *role;
232 if (!role->value || role->value > p->p_roles.nprim)
234 p->p_role_val_to_name[role->value - 1] = key;
235 p->role_val_to_struct[role->value - 1] = role;
239 static int type_index(void *key, void *datum, void *datap)
242 struct type_datum *typdatum;
247 if (typdatum->primary) {
248 if (!typdatum->value || typdatum->value > p->p_types.nprim)
250 p->p_type_val_to_name[typdatum->value - 1] = key;
256 static int user_index(void *key, void *datum, void *datap)
259 struct user_datum *usrdatum;
263 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
265 p->p_user_val_to_name[usrdatum->value - 1] = key;
266 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
270 static int sens_index(void *key, void *datum, void *datap)
273 struct level_datum *levdatum;
278 if (!levdatum->isalias) {
279 if (!levdatum->level->sens ||
280 levdatum->level->sens > p->p_levels.nprim)
282 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
288 static int cat_index(void *key, void *datum, void *datap)
291 struct cat_datum *catdatum;
296 if (!catdatum->isalias) {
297 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
299 p->p_cat_val_to_name[catdatum->value - 1] = key;
305 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
318 * Define the common val_to_name array and the class
319 * val_to_name and val_to_struct arrays in a policy
320 * database structure.
322 * Caller must clean up upon failure.
324 static int policydb_index_classes(struct policydb *p)
328 p->p_common_val_to_name =
329 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
330 if (!p->p_common_val_to_name) {
335 rc = hashtab_map(p->p_commons.table, common_index, p);
339 p->class_val_to_struct =
340 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
341 if (!p->class_val_to_struct) {
346 p->p_class_val_to_name =
347 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
348 if (!p->p_class_val_to_name) {
353 rc = hashtab_map(p->p_classes.table, class_index, p);
359 static void symtab_hash_eval(struct symtab *s)
363 for (i = 0; i < SYM_NUM; i++) {
364 struct hashtab *h = s[i].table;
365 struct hashtab_info info;
367 hashtab_stat(h, &info);
368 printk(KERN_INFO "%s: %d entries and %d/%d buckets used, "
369 "longest chain length %d\n", symtab_name[i], h->nel,
370 info.slots_used, h->size, info.max_chain_len);
376 * Define the other val_to_name and val_to_struct arrays
377 * in a policy database structure.
379 * Caller must clean up on failure.
381 static int policydb_index_others(struct policydb *p)
385 printk(KERN_INFO "security: %d users, %d roles, %d types, %d bools",
386 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
387 if (selinux_mls_enabled)
388 printk(", %d sens, %d cats", p->p_levels.nprim,
392 printk(KERN_INFO "security: %d classes, %d rules\n",
393 p->p_classes.nprim, p->te_avtab.nel);
396 avtab_hash_eval(&p->te_avtab, "rules");
397 symtab_hash_eval(p->symtab);
400 p->role_val_to_struct =
401 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
403 if (!p->role_val_to_struct) {
408 p->user_val_to_struct =
409 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
411 if (!p->user_val_to_struct) {
416 if (cond_init_bool_indexes(p)) {
421 for (i = SYM_ROLES; i < SYM_NUM; i++) {
422 p->sym_val_to_name[i] =
423 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
424 if (!p->sym_val_to_name[i]) {
428 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
438 * The following *_destroy functions are used to
439 * free any memory allocated for each kind of
440 * symbol data in the policy database.
443 static int perm_destroy(void *key, void *datum, void *p)
450 static int common_destroy(void *key, void *datum, void *p)
452 struct common_datum *comdatum;
456 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
457 hashtab_destroy(comdatum->permissions.table);
462 static int class_destroy(void *key, void *datum, void *p)
464 struct class_datum *cladatum;
465 struct constraint_node *constraint, *ctemp;
466 struct constraint_expr *e, *etmp;
470 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
471 hashtab_destroy(cladatum->permissions.table);
472 constraint = cladatum->constraints;
474 e = constraint->expr;
476 ebitmap_destroy(&e->names);
482 constraint = constraint->next;
486 constraint = cladatum->validatetrans;
488 e = constraint->expr;
490 ebitmap_destroy(&e->names);
496 constraint = constraint->next;
500 kfree(cladatum->comkey);
505 static int role_destroy(void *key, void *datum, void *p)
507 struct role_datum *role;
511 ebitmap_destroy(&role->dominates);
512 ebitmap_destroy(&role->types);
517 static int type_destroy(void *key, void *datum, void *p)
524 static int user_destroy(void *key, void *datum, void *p)
526 struct user_datum *usrdatum;
530 ebitmap_destroy(&usrdatum->roles);
531 ebitmap_destroy(&usrdatum->range.level[0].cat);
532 ebitmap_destroy(&usrdatum->range.level[1].cat);
533 ebitmap_destroy(&usrdatum->dfltlevel.cat);
538 static int sens_destroy(void *key, void *datum, void *p)
540 struct level_datum *levdatum;
544 ebitmap_destroy(&levdatum->level->cat);
545 kfree(levdatum->level);
550 static int cat_destroy(void *key, void *datum, void *p)
557 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
569 static void ocontext_destroy(struct ocontext *c, int i)
571 context_destroy(&c->context[0]);
572 context_destroy(&c->context[1]);
573 if (i == OCON_ISID || i == OCON_FS ||
574 i == OCON_NETIF || i == OCON_FSUSE)
580 * Free any memory allocated by a policy database structure.
582 void policydb_destroy(struct policydb *p)
584 struct ocontext *c, *ctmp;
585 struct genfs *g, *gtmp;
588 for (i = 0; i < SYM_NUM; i++) {
589 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
590 hashtab_destroy(p->symtab[i].table);
593 for (i = 0; i < SYM_NUM; i++) {
594 if (p->sym_val_to_name[i])
595 kfree(p->sym_val_to_name[i]);
598 if (p->class_val_to_struct)
599 kfree(p->class_val_to_struct);
600 if (p->role_val_to_struct)
601 kfree(p->role_val_to_struct);
602 if (p->user_val_to_struct)
603 kfree(p->user_val_to_struct);
605 avtab_destroy(&p->te_avtab);
607 for (i = 0; i < OCON_NUM; i++) {
612 ocontext_destroy(ctmp,i);
623 ocontext_destroy(ctmp,OCON_FSUSE);
630 cond_policydb_destroy(p);
636 * Load the initial SIDs specified in a policy database
637 * structure into a SID table.
639 int policydb_load_isids(struct policydb *p, struct sidtab *s)
641 struct ocontext *head, *c;
646 printk(KERN_ERR "security: out of memory on SID table init\n");
650 head = p->ocontexts[OCON_ISID];
651 for (c = head; c; c = c->next) {
652 if (!c->context[0].user) {
653 printk(KERN_ERR "security: SID %s was never "
654 "defined.\n", c->u.name);
658 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
659 printk(KERN_ERR "security: unable to load initial "
660 "SID %s.\n", c->u.name);
670 * Return 1 if the fields in the security context
671 * structure `c' are valid. Return 0 otherwise.
673 int policydb_context_isvalid(struct policydb *p, struct context *c)
675 struct role_datum *role;
676 struct user_datum *usrdatum;
678 if (!c->role || c->role > p->p_roles.nprim)
681 if (!c->user || c->user > p->p_users.nprim)
684 if (!c->type || c->type > p->p_types.nprim)
687 if (c->role != OBJECT_R_VAL) {
689 * Role must be authorized for the type.
691 role = p->role_val_to_struct[c->role - 1];
692 if (!ebitmap_get_bit(&role->types,
694 /* role may not be associated with type */
698 * User must be authorized for the role.
700 usrdatum = p->user_val_to_struct[c->user - 1];
704 if (!ebitmap_get_bit(&usrdatum->roles,
706 /* user may not be associated with role */
710 if (!mls_context_isvalid(p, c))
717 * Read a MLS range structure from a policydb binary
718 * representation file.
720 static int mls_read_range_helper(struct mls_range *r, void *fp)
725 rc = next_entry(buf, fp, sizeof(u32));
729 items = le32_to_cpu(buf[0]);
730 if (items > ARRAY_SIZE(buf)) {
731 printk(KERN_ERR "security: mls: range overflow\n");
735 rc = next_entry(buf, fp, sizeof(u32) * items);
737 printk(KERN_ERR "security: mls: truncated range\n");
740 r->level[0].sens = le32_to_cpu(buf[0]);
742 r->level[1].sens = le32_to_cpu(buf[1]);
744 r->level[1].sens = r->level[0].sens;
746 rc = ebitmap_read(&r->level[0].cat, fp);
748 printk(KERN_ERR "security: mls: error reading low "
753 rc = ebitmap_read(&r->level[1].cat, fp);
755 printk(KERN_ERR "security: mls: error reading high "
760 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
762 printk(KERN_ERR "security: mls: out of memory\n");
771 ebitmap_destroy(&r->level[0].cat);
776 * Read and validate a security context structure
777 * from a policydb binary representation file.
779 static int context_read_and_validate(struct context *c,
786 rc = next_entry(buf, fp, sizeof buf);
788 printk(KERN_ERR "security: context truncated\n");
791 c->user = le32_to_cpu(buf[0]);
792 c->role = le32_to_cpu(buf[1]);
793 c->type = le32_to_cpu(buf[2]);
794 if (p->policyvers >= POLICYDB_VERSION_MLS) {
795 if (mls_read_range_helper(&c->range, fp)) {
796 printk(KERN_ERR "security: error reading MLS range of "
803 if (!policydb_context_isvalid(p, c)) {
804 printk(KERN_ERR "security: invalid security context\n");
813 * The following *_read functions are used to
814 * read the symbol data from a policy database
815 * binary representation file.
818 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
821 struct perm_datum *perdatum;
825 perdatum = kmalloc(sizeof(*perdatum), GFP_KERNEL);
830 memset(perdatum, 0, sizeof(*perdatum));
832 rc = next_entry(buf, fp, sizeof buf);
836 len = le32_to_cpu(buf[0]);
837 perdatum->value = le32_to_cpu(buf[1]);
839 key = kmalloc(len + 1,GFP_KERNEL);
844 rc = next_entry(key, fp, len);
849 rc = hashtab_insert(h, key, perdatum);
855 perm_destroy(key, perdatum, NULL);
859 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
862 struct common_datum *comdatum;
863 u32 buf[4], len, nel;
866 comdatum = kmalloc(sizeof(*comdatum), GFP_KERNEL);
871 memset(comdatum, 0, sizeof(*comdatum));
873 rc = next_entry(buf, fp, sizeof buf);
877 len = le32_to_cpu(buf[0]);
878 comdatum->value = le32_to_cpu(buf[1]);
880 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
883 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
884 nel = le32_to_cpu(buf[3]);
886 key = kmalloc(len + 1,GFP_KERNEL);
891 rc = next_entry(key, fp, len);
896 for (i = 0; i < nel; i++) {
897 rc = perm_read(p, comdatum->permissions.table, fp);
902 rc = hashtab_insert(h, key, comdatum);
908 common_destroy(key, comdatum, NULL);
912 static int read_cons_helper(struct constraint_node **nodep, int ncons,
913 int allowxtarget, void *fp)
915 struct constraint_node *c, *lc;
916 struct constraint_expr *e, *le;
921 for (i = 0; i < ncons; i++) {
922 c = kmalloc(sizeof(*c), GFP_KERNEL);
925 memset(c, 0, sizeof(*c));
933 rc = next_entry(buf, fp, (sizeof(u32) * 2));
936 c->permissions = le32_to_cpu(buf[0]);
937 nexpr = le32_to_cpu(buf[1]);
940 for (j = 0; j < nexpr; j++) {
941 e = kmalloc(sizeof(*e), GFP_KERNEL);
944 memset(e, 0, sizeof(*e));
952 rc = next_entry(buf, fp, (sizeof(u32) * 3));
955 e->expr_type = le32_to_cpu(buf[0]);
956 e->attr = le32_to_cpu(buf[1]);
957 e->op = le32_to_cpu(buf[2]);
959 switch (e->expr_type) {
971 if (depth == (CEXPR_MAXDEPTH - 1))
976 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
978 if (depth == (CEXPR_MAXDEPTH - 1))
981 if (ebitmap_read(&e->names, fp))
997 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1000 struct class_datum *cladatum;
1001 u32 buf[6], len, len2, ncons, nel;
1004 cladatum = kmalloc(sizeof(*cladatum), GFP_KERNEL);
1009 memset(cladatum, 0, sizeof(*cladatum));
1011 rc = next_entry(buf, fp, sizeof(u32)*6);
1015 len = le32_to_cpu(buf[0]);
1016 len2 = le32_to_cpu(buf[1]);
1017 cladatum->value = le32_to_cpu(buf[2]);
1019 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1022 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1023 nel = le32_to_cpu(buf[4]);
1025 ncons = le32_to_cpu(buf[5]);
1027 key = kmalloc(len + 1,GFP_KERNEL);
1032 rc = next_entry(key, fp, len);
1038 cladatum->comkey = kmalloc(len2 + 1,GFP_KERNEL);
1039 if (!cladatum->comkey) {
1043 rc = next_entry(cladatum->comkey, fp, len2);
1046 cladatum->comkey[len2] = 0;
1048 cladatum->comdatum = hashtab_search(p->p_commons.table,
1050 if (!cladatum->comdatum) {
1051 printk(KERN_ERR "security: unknown common %s\n",
1057 for (i = 0; i < nel; i++) {
1058 rc = perm_read(p, cladatum->permissions.table, fp);
1063 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1067 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1068 /* grab the validatetrans rules */
1069 rc = next_entry(buf, fp, sizeof(u32));
1072 ncons = le32_to_cpu(buf[0]);
1073 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1078 rc = hashtab_insert(h, key, cladatum);
1086 class_destroy(key, cladatum, NULL);
1090 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1093 struct role_datum *role;
1097 role = kmalloc(sizeof(*role), GFP_KERNEL);
1102 memset(role, 0, sizeof(*role));
1104 rc = next_entry(buf, fp, sizeof buf);
1108 len = le32_to_cpu(buf[0]);
1109 role->value = le32_to_cpu(buf[1]);
1111 key = kmalloc(len + 1,GFP_KERNEL);
1116 rc = next_entry(key, fp, len);
1121 rc = ebitmap_read(&role->dominates, fp);
1125 rc = ebitmap_read(&role->types, fp);
1129 if (strcmp(key, OBJECT_R) == 0) {
1130 if (role->value != OBJECT_R_VAL) {
1131 printk(KERN_ERR "Role %s has wrong value %d\n",
1132 OBJECT_R, role->value);
1140 rc = hashtab_insert(h, key, role);
1146 role_destroy(key, role, NULL);
1150 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1153 struct type_datum *typdatum;
1157 typdatum = kmalloc(sizeof(*typdatum),GFP_KERNEL);
1162 memset(typdatum, 0, sizeof(*typdatum));
1164 rc = next_entry(buf, fp, sizeof buf);
1168 len = le32_to_cpu(buf[0]);
1169 typdatum->value = le32_to_cpu(buf[1]);
1170 typdatum->primary = le32_to_cpu(buf[2]);
1172 key = kmalloc(len + 1,GFP_KERNEL);
1177 rc = next_entry(key, fp, len);
1182 rc = hashtab_insert(h, key, typdatum);
1188 type_destroy(key, typdatum, NULL);
1194 * Read a MLS level structure from a policydb binary
1195 * representation file.
1197 static int mls_read_level(struct mls_level *lp, void *fp)
1202 memset(lp, 0, sizeof(*lp));
1204 rc = next_entry(buf, fp, sizeof buf);
1206 printk(KERN_ERR "security: mls: truncated level\n");
1209 lp->sens = le32_to_cpu(buf[0]);
1211 if (ebitmap_read(&lp->cat, fp)) {
1212 printk(KERN_ERR "security: mls: error reading level "
1222 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1225 struct user_datum *usrdatum;
1229 usrdatum = kmalloc(sizeof(*usrdatum), GFP_KERNEL);
1234 memset(usrdatum, 0, sizeof(*usrdatum));
1236 rc = next_entry(buf, fp, sizeof buf);
1240 len = le32_to_cpu(buf[0]);
1241 usrdatum->value = le32_to_cpu(buf[1]);
1243 key = kmalloc(len + 1,GFP_KERNEL);
1248 rc = next_entry(key, fp, len);
1253 rc = ebitmap_read(&usrdatum->roles, fp);
1257 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1258 rc = mls_read_range_helper(&usrdatum->range, fp);
1261 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1266 rc = hashtab_insert(h, key, usrdatum);
1272 user_destroy(key, usrdatum, NULL);
1276 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1279 struct level_datum *levdatum;
1283 levdatum = kmalloc(sizeof(*levdatum), GFP_ATOMIC);
1288 memset(levdatum, 0, sizeof(*levdatum));
1290 rc = next_entry(buf, fp, sizeof buf);
1294 len = le32_to_cpu(buf[0]);
1295 levdatum->isalias = le32_to_cpu(buf[1]);
1297 key = kmalloc(len + 1,GFP_ATOMIC);
1302 rc = next_entry(key, fp, len);
1307 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1308 if (!levdatum->level) {
1312 if (mls_read_level(levdatum->level, fp)) {
1317 rc = hashtab_insert(h, key, levdatum);
1323 sens_destroy(key, levdatum, NULL);
1327 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1330 struct cat_datum *catdatum;
1334 catdatum = kmalloc(sizeof(*catdatum), GFP_ATOMIC);
1339 memset(catdatum, 0, sizeof(*catdatum));
1341 rc = next_entry(buf, fp, sizeof buf);
1345 len = le32_to_cpu(buf[0]);
1346 catdatum->value = le32_to_cpu(buf[1]);
1347 catdatum->isalias = le32_to_cpu(buf[2]);
1349 key = kmalloc(len + 1,GFP_ATOMIC);
1354 rc = next_entry(key, fp, len);
1359 rc = hashtab_insert(h, key, catdatum);
1366 cat_destroy(key, catdatum, NULL);
1370 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1382 extern int ss_initialized;
1385 * Read the configuration data from a policy database binary
1386 * representation file into a policy database structure.
1388 int policydb_read(struct policydb *p, void *fp)
1390 struct role_allow *ra, *lra;
1391 struct role_trans *tr, *ltr;
1392 struct ocontext *l, *c, *newc;
1393 struct genfs *genfs_p, *genfs, *newgenfs;
1395 u32 buf[8], len, len2, config, nprim, nel, nel2;
1397 struct policydb_compat_info *info;
1398 struct range_trans *rt, *lrt;
1402 rc = policydb_init(p);
1406 /* Read the magic number and string length. */
1407 rc = next_entry(buf, fp, sizeof(u32)* 2);
1411 for (i = 0; i < 2; i++)
1412 buf[i] = le32_to_cpu(buf[i]);
1414 if (buf[0] != POLICYDB_MAGIC) {
1415 printk(KERN_ERR "security: policydb magic number 0x%x does "
1416 "not match expected magic number 0x%x\n",
1417 buf[0], POLICYDB_MAGIC);
1422 if (len != strlen(POLICYDB_STRING)) {
1423 printk(KERN_ERR "security: policydb string length %d does not "
1424 "match expected length %Zu\n",
1425 len, strlen(POLICYDB_STRING));
1428 policydb_str = kmalloc(len + 1,GFP_KERNEL);
1429 if (!policydb_str) {
1430 printk(KERN_ERR "security: unable to allocate memory for policydb "
1431 "string of length %d\n", len);
1435 rc = next_entry(policydb_str, fp, len);
1437 printk(KERN_ERR "security: truncated policydb string identifier\n");
1438 kfree(policydb_str);
1441 policydb_str[len] = 0;
1442 if (strcmp(policydb_str, POLICYDB_STRING)) {
1443 printk(KERN_ERR "security: policydb string %s does not match "
1444 "my string %s\n", policydb_str, POLICYDB_STRING);
1445 kfree(policydb_str);
1448 /* Done with policydb_str. */
1449 kfree(policydb_str);
1450 policydb_str = NULL;
1452 /* Read the version, config, and table sizes. */
1453 rc = next_entry(buf, fp, sizeof(u32)*4);
1456 for (i = 0; i < 4; i++)
1457 buf[i] = le32_to_cpu(buf[i]);
1459 p->policyvers = buf[0];
1460 if (p->policyvers < POLICYDB_VERSION_MIN ||
1461 p->policyvers > POLICYDB_VERSION_MAX) {
1462 printk(KERN_ERR "security: policydb version %d does not match "
1463 "my version range %d-%d\n",
1464 buf[0], POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1468 if ((buf[1] & POLICYDB_CONFIG_MLS)) {
1469 if (ss_initialized && !selinux_mls_enabled) {
1470 printk(KERN_ERR "Cannot switch between non-MLS and MLS "
1474 selinux_mls_enabled = 1;
1475 config |= POLICYDB_CONFIG_MLS;
1477 if (p->policyvers < POLICYDB_VERSION_MLS) {
1478 printk(KERN_ERR "security policydb version %d (MLS) "
1479 "not backwards compatible\n", p->policyvers);
1483 if (ss_initialized && selinux_mls_enabled) {
1484 printk(KERN_ERR "Cannot switch between MLS and non-MLS "
1490 info = policydb_lookup_compat(p->policyvers);
1492 printk(KERN_ERR "security: unable to find policy compat info "
1493 "for version %d\n", p->policyvers);
1497 if (buf[2] != info->sym_num || buf[3] != info->ocon_num) {
1498 printk(KERN_ERR "security: policydb table sizes (%d,%d) do "
1499 "not match mine (%d,%d)\n", buf[2], buf[3],
1500 info->sym_num, info->ocon_num);
1504 for (i = 0; i < info->sym_num; i++) {
1505 rc = next_entry(buf, fp, sizeof(u32)*2);
1508 nprim = le32_to_cpu(buf[0]);
1509 nel = le32_to_cpu(buf[1]);
1510 for (j = 0; j < nel; j++) {
1511 rc = read_f[i](p, p->symtab[i].table, fp);
1516 p->symtab[i].nprim = nprim;
1519 rc = avtab_read(&p->te_avtab, fp, config);
1523 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1524 rc = cond_read_list(p, fp);
1529 rc = next_entry(buf, fp, sizeof(u32));
1532 nel = le32_to_cpu(buf[0]);
1534 for (i = 0; i < nel; i++) {
1535 tr = kmalloc(sizeof(*tr), GFP_KERNEL);
1540 memset(tr, 0, sizeof(*tr));
1546 rc = next_entry(buf, fp, sizeof(u32)*3);
1549 tr->role = le32_to_cpu(buf[0]);
1550 tr->type = le32_to_cpu(buf[1]);
1551 tr->new_role = le32_to_cpu(buf[2]);
1555 rc = next_entry(buf, fp, sizeof(u32));
1558 nel = le32_to_cpu(buf[0]);
1560 for (i = 0; i < nel; i++) {
1561 ra = kmalloc(sizeof(*ra), GFP_KERNEL);
1566 memset(ra, 0, sizeof(*ra));
1572 rc = next_entry(buf, fp, sizeof(u32)*2);
1575 ra->role = le32_to_cpu(buf[0]);
1576 ra->new_role = le32_to_cpu(buf[1]);
1580 rc = policydb_index_classes(p);
1584 rc = policydb_index_others(p);
1588 for (i = 0; i < info->ocon_num; i++) {
1589 rc = next_entry(buf, fp, sizeof(u32));
1592 nel = le32_to_cpu(buf[0]);
1594 for (j = 0; j < nel; j++) {
1595 c = kmalloc(sizeof(*c), GFP_KERNEL);
1600 memset(c, 0, sizeof(*c));
1604 p->ocontexts[i] = c;
1610 rc = next_entry(buf, fp, sizeof(u32));
1613 c->sid[0] = le32_to_cpu(buf[0]);
1614 rc = context_read_and_validate(&c->context[0], p, fp);
1620 rc = next_entry(buf, fp, sizeof(u32));
1623 len = le32_to_cpu(buf[0]);
1624 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1629 rc = next_entry(c->u.name, fp, len);
1633 rc = context_read_and_validate(&c->context[0], p, fp);
1636 rc = context_read_and_validate(&c->context[1], p, fp);
1641 rc = next_entry(buf, fp, sizeof(u32)*3);
1644 c->u.port.protocol = le32_to_cpu(buf[0]);
1645 c->u.port.low_port = le32_to_cpu(buf[1]);
1646 c->u.port.high_port = le32_to_cpu(buf[2]);
1647 rc = context_read_and_validate(&c->context[0], p, fp);
1652 rc = next_entry(buf, fp, sizeof(u32)* 2);
1655 c->u.node.addr = le32_to_cpu(buf[0]);
1656 c->u.node.mask = le32_to_cpu(buf[1]);
1657 rc = context_read_and_validate(&c->context[0], p, fp);
1662 rc = next_entry(buf, fp, sizeof(u32)*2);
1665 c->v.behavior = le32_to_cpu(buf[0]);
1666 if (c->v.behavior > SECURITY_FS_USE_NONE)
1668 len = le32_to_cpu(buf[1]);
1669 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1674 rc = next_entry(c->u.name, fp, len);
1678 rc = context_read_and_validate(&c->context[0], p, fp);
1685 rc = next_entry(buf, fp, sizeof(u32) * 8);
1688 for (k = 0; k < 4; k++)
1689 c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1690 for (k = 0; k < 4; k++)
1691 c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1692 if (context_read_and_validate(&c->context[0], p, fp))
1700 rc = next_entry(buf, fp, sizeof(u32));
1703 nel = le32_to_cpu(buf[0]);
1706 for (i = 0; i < nel; i++) {
1707 rc = next_entry(buf, fp, sizeof(u32));
1710 len = le32_to_cpu(buf[0]);
1711 newgenfs = kmalloc(sizeof(*newgenfs), GFP_KERNEL);
1716 memset(newgenfs, 0, sizeof(*newgenfs));
1718 newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
1719 if (!newgenfs->fstype) {
1724 rc = next_entry(newgenfs->fstype, fp, len);
1726 kfree(newgenfs->fstype);
1730 newgenfs->fstype[len] = 0;
1731 for (genfs_p = NULL, genfs = p->genfs; genfs;
1732 genfs_p = genfs, genfs = genfs->next) {
1733 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1734 printk(KERN_ERR "security: dup genfs "
1735 "fstype %s\n", newgenfs->fstype);
1736 kfree(newgenfs->fstype);
1740 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1743 newgenfs->next = genfs;
1745 genfs_p->next = newgenfs;
1747 p->genfs = newgenfs;
1748 rc = next_entry(buf, fp, sizeof(u32));
1751 nel2 = le32_to_cpu(buf[0]);
1752 for (j = 0; j < nel2; j++) {
1753 rc = next_entry(buf, fp, sizeof(u32));
1756 len = le32_to_cpu(buf[0]);
1758 newc = kmalloc(sizeof(*newc), GFP_KERNEL);
1763 memset(newc, 0, sizeof(*newc));
1765 newc->u.name = kmalloc(len + 1,GFP_KERNEL);
1766 if (!newc->u.name) {
1770 rc = next_entry(newc->u.name, fp, len);
1773 newc->u.name[len] = 0;
1774 rc = next_entry(buf, fp, sizeof(u32));
1777 newc->v.sclass = le32_to_cpu(buf[0]);
1778 if (context_read_and_validate(&newc->context[0], p, fp))
1780 for (l = NULL, c = newgenfs->head; c;
1781 l = c, c = c->next) {
1782 if (!strcmp(newc->u.name, c->u.name) &&
1783 (!c->v.sclass || !newc->v.sclass ||
1784 newc->v.sclass == c->v.sclass)) {
1785 printk(KERN_ERR "security: dup genfs "
1787 newgenfs->fstype, c->u.name);
1790 len = strlen(newc->u.name);
1791 len2 = strlen(c->u.name);
1800 newgenfs->head = newc;
1804 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1805 rc = next_entry(buf, fp, sizeof(u32));
1808 nel = le32_to_cpu(buf[0]);
1810 for (i = 0; i < nel; i++) {
1811 rt = kmalloc(sizeof(*rt), GFP_KERNEL);
1816 memset(rt, 0, sizeof(*rt));
1821 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1824 rt->dom = le32_to_cpu(buf[0]);
1825 rt->type = le32_to_cpu(buf[1]);
1826 rc = mls_read_range_helper(&rt->range, fp);
1837 ocontext_destroy(newc,OCON_FSUSE);
1841 policydb_destroy(p);