/security/selinux/ss/policydb.c
C | 2435 lines | 1974 code | 362 blank | 99 comment | 368 complexity | bac0f9ae1f1f5c5096f1b48828d8b6ab MD5 | raw file
- /*
- * Implementation of the policy database.
- *
- * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
- */
- /*
- * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
- *
- * Support for enhanced MLS infrastructure.
- *
- * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
- *
- * Added conditional policy language extensions
- *
- * Updated: Hewlett-Packard <paul@paul-moore.com>
- *
- * Added support for the policy capability bitmap
- *
- * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
- * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
- * Copyright (C) 2003 - 2004 Tresys Technology, LLC
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, version 2.
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/audit.h>
- #include <linux/flex_array.h>
- #include "security.h"
- #include "policydb.h"
- #include "conditional.h"
- #include "mls.h"
- #include "services.h"
- #define _DEBUG_HASHES
- #ifdef DEBUG_HASHES
- static const char *symtab_name[SYM_NUM] = {
- "common prefixes",
- "classes",
- "roles",
- "types",
- "users",
- "bools",
- "levels",
- "categories",
- };
- #endif
- static unsigned int symtab_sizes[SYM_NUM] = {
- 2,
- 32,
- 16,
- 512,
- 128,
- 16,
- 16,
- 16,
- };
- struct policydb_compat_info {
- int version;
- int sym_num;
- int ocon_num;
- };
- /* These need to be updated if SYM_NUM or OCON_NUM changes */
- static struct policydb_compat_info policydb_compat[] = {
- {
- .version = POLICYDB_VERSION_BASE,
- .sym_num = SYM_NUM - 3,
- .ocon_num = OCON_NUM - 1,
- },
- {
- .version = POLICYDB_VERSION_BOOL,
- .sym_num = SYM_NUM - 2,
- .ocon_num = OCON_NUM - 1,
- },
- {
- .version = POLICYDB_VERSION_IPV6,
- .sym_num = SYM_NUM - 2,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_NLCLASS,
- .sym_num = SYM_NUM - 2,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_MLS,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_AVTAB,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_RANGETRANS,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_POLCAP,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_PERMISSIVE,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_BOUNDARY,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_FILENAME_TRANS,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- {
- .version = POLICYDB_VERSION_ROLETRANS,
- .sym_num = SYM_NUM,
- .ocon_num = OCON_NUM,
- },
- };
- static struct policydb_compat_info *policydb_lookup_compat(int version)
- {
- int i;
- struct policydb_compat_info *info = NULL;
- for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
- if (policydb_compat[i].version == version) {
- info = &policydb_compat[i];
- break;
- }
- }
- return info;
- }
- /*
- * Initialize the role table.
- */
- static int roles_init(struct policydb *p)
- {
- char *key = NULL;
- int rc;
- struct role_datum *role;
- rc = -ENOMEM;
- role = kzalloc(sizeof(*role), GFP_KERNEL);
- if (!role)
- goto out;
- rc = -EINVAL;
- role->value = ++p->p_roles.nprim;
- if (role->value != OBJECT_R_VAL)
- goto out;
- rc = -ENOMEM;
- key = kstrdup(OBJECT_R, GFP_KERNEL);
- if (!key)
- goto out;
- rc = hashtab_insert(p->p_roles.table, key, role);
- if (rc)
- goto out;
- return 0;
- out:
- kfree(key);
- kfree(role);
- return rc;
- }
- static u32 filenametr_hash(struct hashtab *h, const void *k)
- {
- const struct filename_trans *ft = k;
- unsigned long hash;
- unsigned int byte_num;
- unsigned char focus;
- hash = ft->stype ^ ft->ttype ^ ft->tclass;
- byte_num = 0;
- while ((focus = ft->name[byte_num++]))
- hash = partial_name_hash(focus, hash);
- return hash & (h->size - 1);
- }
- static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
- {
- const struct filename_trans *ft1 = k1;
- const struct filename_trans *ft2 = k2;
- int v;
- v = ft1->stype - ft2->stype;
- if (v)
- return v;
- v = ft1->ttype - ft2->ttype;
- if (v)
- return v;
- v = ft1->tclass - ft2->tclass;
- if (v)
- return v;
- return strcmp(ft1->name, ft2->name);
- }
- static u32 rangetr_hash(struct hashtab *h, const void *k)
- {
- const struct range_trans *key = k;
- return (key->source_type + (key->target_type << 3) +
- (key->target_class << 5)) & (h->size - 1);
- }
- static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
- {
- const struct range_trans *key1 = k1, *key2 = k2;
- int v;
- v = key1->source_type - key2->source_type;
- if (v)
- return v;
- v = key1->target_type - key2->target_type;
- if (v)
- return v;
- v = key1->target_class - key2->target_class;
- return v;
- }
- /*
- * Initialize a policy database structure.
- */
- static int policydb_init(struct policydb *p)
- {
- int i, rc;
- memset(p, 0, sizeof(*p));
- for (i = 0; i < SYM_NUM; i++) {
- rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
- if (rc)
- goto out;
- }
- rc = avtab_init(&p->te_avtab);
- if (rc)
- goto out;
- rc = roles_init(p);
- if (rc)
- goto out;
- rc = cond_policydb_init(p);
- if (rc)
- goto out;
- p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
- if (!p->filename_trans)
- goto out;
- p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
- if (!p->range_tr)
- goto out;
- ebitmap_init(&p->filename_trans_ttypes);
- ebitmap_init(&p->policycaps);
- ebitmap_init(&p->permissive_map);
- return 0;
- out:
- hashtab_destroy(p->filename_trans);
- hashtab_destroy(p->range_tr);
- for (i = 0; i < SYM_NUM; i++)
- hashtab_destroy(p->symtab[i].table);
- return rc;
- }
- /*
- * The following *_index functions are used to
- * define the val_to_name and val_to_struct arrays
- * in a policy database structure. The val_to_name
- * arrays are used when converting security context
- * structures into string representations. The
- * val_to_struct arrays are used when the attributes
- * of a class, role, or user are needed.
- */
- static int common_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct common_datum *comdatum;
- struct flex_array *fa;
- comdatum = datum;
- p = datap;
- if (!comdatum->value || comdatum->value > p->p_commons.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_COMMONS];
- if (flex_array_put_ptr(fa, comdatum->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- return 0;
- }
- static int class_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct class_datum *cladatum;
- struct flex_array *fa;
- cladatum = datum;
- p = datap;
- if (!cladatum->value || cladatum->value > p->p_classes.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_CLASSES];
- if (flex_array_put_ptr(fa, cladatum->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- p->class_val_to_struct[cladatum->value - 1] = cladatum;
- return 0;
- }
- static int role_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct role_datum *role;
- struct flex_array *fa;
- role = datum;
- p = datap;
- if (!role->value
- || role->value > p->p_roles.nprim
- || role->bounds > p->p_roles.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_ROLES];
- if (flex_array_put_ptr(fa, role->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- p->role_val_to_struct[role->value - 1] = role;
- return 0;
- }
- static int type_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct type_datum *typdatum;
- struct flex_array *fa;
- typdatum = datum;
- p = datap;
- if (typdatum->primary) {
- if (!typdatum->value
- || typdatum->value > p->p_types.nprim
- || typdatum->bounds > p->p_types.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_TYPES];
- if (flex_array_put_ptr(fa, typdatum->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- fa = p->type_val_to_struct_array;
- if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- }
- return 0;
- }
- static int user_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct user_datum *usrdatum;
- struct flex_array *fa;
- usrdatum = datum;
- p = datap;
- if (!usrdatum->value
- || usrdatum->value > p->p_users.nprim
- || usrdatum->bounds > p->p_users.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_USERS];
- if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
- return 0;
- }
- static int sens_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct level_datum *levdatum;
- struct flex_array *fa;
- levdatum = datum;
- p = datap;
- if (!levdatum->isalias) {
- if (!levdatum->level->sens ||
- levdatum->level->sens > p->p_levels.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_LEVELS];
- if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- }
- return 0;
- }
- static int cat_index(void *key, void *datum, void *datap)
- {
- struct policydb *p;
- struct cat_datum *catdatum;
- struct flex_array *fa;
- catdatum = datum;
- p = datap;
- if (!catdatum->isalias) {
- if (!catdatum->value || catdatum->value > p->p_cats.nprim)
- return -EINVAL;
- fa = p->sym_val_to_name[SYM_CATS];
- if (flex_array_put_ptr(fa, catdatum->value - 1, key,
- GFP_KERNEL | __GFP_ZERO))
- BUG();
- }
- return 0;
- }
- static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
- {
- common_index,
- class_index,
- role_index,
- type_index,
- user_index,
- cond_index_bool,
- sens_index,
- cat_index,
- };
- #ifdef DEBUG_HASHES
- static void hash_eval(struct hashtab *h, const char *hash_name)
- {
- struct hashtab_info info;
- hashtab_stat(h, &info);
- printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
- "longest chain length %d\n", hash_name, h->nel,
- info.slots_used, h->size, info.max_chain_len);
- }
- static void symtab_hash_eval(struct symtab *s)
- {
- int i;
- for (i = 0; i < SYM_NUM; i++)
- hash_eval(s[i].table, symtab_name[i]);
- }
- #else
- static inline void hash_eval(struct hashtab *h, char *hash_name)
- {
- }
- #endif
- /*
- * Define the other val_to_name and val_to_struct arrays
- * in a policy database structure.
- *
- * Caller must clean up on failure.
- */
- static int policydb_index(struct policydb *p)
- {
- int i, rc;
- printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
- p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
- if (p->mls_enabled)
- printk(", %d sens, %d cats", p->p_levels.nprim,
- p->p_cats.nprim);
- printk("\n");
- printk(KERN_DEBUG "SELinux: %d classes, %d rules\n",
- p->p_classes.nprim, p->te_avtab.nel);
- #ifdef DEBUG_HASHES
- avtab_hash_eval(&p->te_avtab, "rules");
- symtab_hash_eval(p->symtab);
- #endif
- rc = -ENOMEM;
- p->class_val_to_struct =
- kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
- GFP_KERNEL);
- if (!p->class_val_to_struct)
- goto out;
- rc = -ENOMEM;
- p->role_val_to_struct =
- kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
- GFP_KERNEL);
- if (!p->role_val_to_struct)
- goto out;
- rc = -ENOMEM;
- p->user_val_to_struct =
- kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
- GFP_KERNEL);
- if (!p->user_val_to_struct)
- goto out;
- /* Yes, I want the sizeof the pointer, not the structure */
- rc = -ENOMEM;
- p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
- p->p_types.nprim,
- GFP_KERNEL | __GFP_ZERO);
- if (!p->type_val_to_struct_array)
- goto out;
- rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
- p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
- if (rc)
- goto out;
- rc = cond_init_bool_indexes(p);
- if (rc)
- goto out;
- for (i = 0; i < SYM_NUM; i++) {
- rc = -ENOMEM;
- p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
- p->symtab[i].nprim,
- GFP_KERNEL | __GFP_ZERO);
- if (!p->sym_val_to_name[i])
- goto out;
- rc = flex_array_prealloc(p->sym_val_to_name[i],
- 0, p->symtab[i].nprim,
- GFP_KERNEL | __GFP_ZERO);
- if (rc)
- goto out;
- rc = hashtab_map(p->symtab[i].table, index_f[i], p);
- if (rc)
- goto out;
- }
- rc = 0;
- out:
- return rc;
- }
- /*
- * The following *_destroy functions are used to
- * free any memory allocated for each kind of
- * symbol data in the policy database.
- */
- static int perm_destroy(void *key, void *datum, void *p)
- {
- kfree(key);
- kfree(datum);
- return 0;
- }
- static int common_destroy(void *key, void *datum, void *p)
- {
- struct common_datum *comdatum;
- kfree(key);
- if (datum) {
- comdatum = datum;
- hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
- hashtab_destroy(comdatum->permissions.table);
- }
- kfree(datum);
- return 0;
- }
- static int cls_destroy(void *key, void *datum, void *p)
- {
- struct class_datum *cladatum;
- struct constraint_node *constraint, *ctemp;
- struct constraint_expr *e, *etmp;
- kfree(key);
- if (datum) {
- cladatum = datum;
- hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
- hashtab_destroy(cladatum->permissions.table);
- constraint = cladatum->constraints;
- while (constraint) {
- e = constraint->expr;
- while (e) {
- ebitmap_destroy(&e->names);
- etmp = e;
- e = e->next;
- kfree(etmp);
- }
- ctemp = constraint;
- constraint = constraint->next;
- kfree(ctemp);
- }
- constraint = cladatum->validatetrans;
- while (constraint) {
- e = constraint->expr;
- while (e) {
- ebitmap_destroy(&e->names);
- etmp = e;
- e = e->next;
- kfree(etmp);
- }
- ctemp = constraint;
- constraint = constraint->next;
- kfree(ctemp);
- }
- kfree(cladatum->comkey);
- }
- kfree(datum);
- return 0;
- }
- static int role_destroy(void *key, void *datum, void *p)
- {
- struct role_datum *role;
- kfree(key);
- if (datum) {
- role = datum;
- ebitmap_destroy(&role->dominates);
- ebitmap_destroy(&role->types);
- }
- kfree(datum);
- return 0;
- }
- static int type_destroy(void *key, void *datum, void *p)
- {
- kfree(key);
- kfree(datum);
- return 0;
- }
- static int user_destroy(void *key, void *datum, void *p)
- {
- struct user_datum *usrdatum;
- kfree(key);
- if (datum) {
- usrdatum = datum;
- ebitmap_destroy(&usrdatum->roles);
- ebitmap_destroy(&usrdatum->range.level[0].cat);
- ebitmap_destroy(&usrdatum->range.level[1].cat);
- ebitmap_destroy(&usrdatum->dfltlevel.cat);
- }
- kfree(datum);
- return 0;
- }
- static int sens_destroy(void *key, void *datum, void *p)
- {
- struct level_datum *levdatum;
- kfree(key);
- if (datum) {
- levdatum = datum;
- ebitmap_destroy(&levdatum->level->cat);
- kfree(levdatum->level);
- }
- kfree(datum);
- return 0;
- }
- static int cat_destroy(void *key, void *datum, void *p)
- {
- kfree(key);
- kfree(datum);
- return 0;
- }
- static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
- {
- common_destroy,
- cls_destroy,
- role_destroy,
- type_destroy,
- user_destroy,
- cond_destroy_bool,
- sens_destroy,
- cat_destroy,
- };
- static int filenametr_destroy(void *key, void *datum, void *p)
- {
- struct filename_trans *ft = key;
- kfree(ft->name);
- kfree(key);
- kfree(datum);
- cond_resched();
- return 0;
- }
- static int range_tr_destroy(void *key, void *datum, void *p)
- {
- struct mls_range *rt = datum;
- kfree(key);
- ebitmap_destroy(&rt->level[0].cat);
- ebitmap_destroy(&rt->level[1].cat);
- kfree(datum);
- cond_resched();
- return 0;
- }
- static void ocontext_destroy(struct ocontext *c, int i)
- {
- if (!c)
- return;
- context_destroy(&c->context[0]);
- context_destroy(&c->context[1]);
- if (i == OCON_ISID || i == OCON_FS ||
- i == OCON_NETIF || i == OCON_FSUSE)
- kfree(c->u.name);
- kfree(c);
- }
- /*
- * Free any memory allocated by a policy database structure.
- */
- void policydb_destroy(struct policydb *p)
- {
- struct ocontext *c, *ctmp;
- struct genfs *g, *gtmp;
- int i;
- struct role_allow *ra, *lra = NULL;
- struct role_trans *tr, *ltr = NULL;
- for (i = 0; i < SYM_NUM; i++) {
- cond_resched();
- hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
- hashtab_destroy(p->symtab[i].table);
- }
- for (i = 0; i < SYM_NUM; i++) {
- if (p->sym_val_to_name[i])
- flex_array_free(p->sym_val_to_name[i]);
- }
- kfree(p->class_val_to_struct);
- kfree(p->role_val_to_struct);
- kfree(p->user_val_to_struct);
- if (p->type_val_to_struct_array)
- flex_array_free(p->type_val_to_struct_array);
- avtab_destroy(&p->te_avtab);
- for (i = 0; i < OCON_NUM; i++) {
- cond_resched();
- c = p->ocontexts[i];
- while (c) {
- ctmp = c;
- c = c->next;
- ocontext_destroy(ctmp, i);
- }
- p->ocontexts[i] = NULL;
- }
- g = p->genfs;
- while (g) {
- cond_resched();
- kfree(g->fstype);
- c = g->head;
- while (c) {
- ctmp = c;
- c = c->next;
- ocontext_destroy(ctmp, OCON_FSUSE);
- }
- gtmp = g;
- g = g->next;
- kfree(gtmp);
- }
- p->genfs = NULL;
- cond_policydb_destroy(p);
- for (tr = p->role_tr; tr; tr = tr->next) {
- cond_resched();
- kfree(ltr);
- ltr = tr;
- }
- kfree(ltr);
- for (ra = p->role_allow; ra; ra = ra->next) {
- cond_resched();
- kfree(lra);
- lra = ra;
- }
- kfree(lra);
- hashtab_map(p->filename_trans, filenametr_destroy, NULL);
- hashtab_destroy(p->filename_trans);
- hashtab_map(p->range_tr, range_tr_destroy, NULL);
- hashtab_destroy(p->range_tr);
- if (p->type_attr_map_array) {
- for (i = 0; i < p->p_types.nprim; i++) {
- struct ebitmap *e;
- e = flex_array_get(p->type_attr_map_array, i);
- if (!e)
- continue;
- ebitmap_destroy(e);
- }
- flex_array_free(p->type_attr_map_array);
- }
- ebitmap_destroy(&p->filename_trans_ttypes);
- ebitmap_destroy(&p->policycaps);
- ebitmap_destroy(&p->permissive_map);
- return;
- }
- /*
- * Load the initial SIDs specified in a policy database
- * structure into a SID table.
- */
- int policydb_load_isids(struct policydb *p, struct sidtab *s)
- {
- struct ocontext *head, *c;
- int rc;
- rc = sidtab_init(s);
- if (rc) {
- printk(KERN_ERR "SELinux: out of memory on SID table init\n");
- goto out;
- }
- head = p->ocontexts[OCON_ISID];
- for (c = head; c; c = c->next) {
- rc = -EINVAL;
- if (!c->context[0].user) {
- printk(KERN_ERR "SELinux: SID %s was never defined.\n",
- c->u.name);
- goto out;
- }
- rc = sidtab_insert(s, c->sid[0], &c->context[0]);
- if (rc) {
- printk(KERN_ERR "SELinux: unable to load initial SID %s.\n",
- c->u.name);
- goto out;
- }
- }
- rc = 0;
- out:
- return rc;
- }
- int policydb_class_isvalid(struct policydb *p, unsigned int class)
- {
- if (!class || class > p->p_classes.nprim)
- return 0;
- return 1;
- }
- int policydb_role_isvalid(struct policydb *p, unsigned int role)
- {
- if (!role || role > p->p_roles.nprim)
- return 0;
- return 1;
- }
- int policydb_type_isvalid(struct policydb *p, unsigned int type)
- {
- if (!type || type > p->p_types.nprim)
- return 0;
- return 1;
- }
- /*
- * Return 1 if the fields in the security context
- * structure `c' are valid. Return 0 otherwise.
- */
- int policydb_context_isvalid(struct policydb *p, struct context *c)
- {
- struct role_datum *role;
- struct user_datum *usrdatum;
- if (!c->role || c->role > p->p_roles.nprim)
- return 0;
- if (!c->user || c->user > p->p_users.nprim)
- return 0;
- if (!c->type || c->type > p->p_types.nprim)
- return 0;
- if (c->role != OBJECT_R_VAL) {
- /*
- * Role must be authorized for the type.
- */
- role = p->role_val_to_struct[c->role - 1];
- if (!ebitmap_get_bit(&role->types, c->type - 1))
- /* role may not be associated with type */
- return 0;
- /*
- * User must be authorized for the role.
- */
- usrdatum = p->user_val_to_struct[c->user - 1];
- if (!usrdatum)
- return 0;
- if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
- /* user may not be associated with role */
- return 0;
- }
- if (!mls_context_isvalid(p, c))
- return 0;
- return 1;
- }
- /*
- * Read a MLS range structure from a policydb binary
- * representation file.
- */
- static int mls_read_range_helper(struct mls_range *r, void *fp)
- {
- __le32 buf[2];
- u32 items;
- int rc;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- rc = -EINVAL;
- items = le32_to_cpu(buf[0]);
- if (items > ARRAY_SIZE(buf)) {
- printk(KERN_ERR "SELinux: mls: range overflow\n");
- goto out;
- }
- rc = next_entry(buf, fp, sizeof(u32) * items);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: truncated range\n");
- goto out;
- }
- r->level[0].sens = le32_to_cpu(buf[0]);
- if (items > 1)
- r->level[1].sens = le32_to_cpu(buf[1]);
- else
- r->level[1].sens = r->level[0].sens;
- rc = ebitmap_read(&r->level[0].cat, fp);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: error reading low categories\n");
- goto out;
- }
- if (items > 1) {
- rc = ebitmap_read(&r->level[1].cat, fp);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: error reading high categories\n");
- goto bad_high;
- }
- } else {
- rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: out of memory\n");
- goto bad_high;
- }
- }
- return 0;
- bad_high:
- ebitmap_destroy(&r->level[0].cat);
- out:
- return rc;
- }
- /*
- * Read and validate a security context structure
- * from a policydb binary representation file.
- */
- static int context_read_and_validate(struct context *c,
- struct policydb *p,
- void *fp)
- {
- __le32 buf[3];
- int rc;
- rc = next_entry(buf, fp, sizeof buf);
- if (rc) {
- printk(KERN_ERR "SELinux: context truncated\n");
- goto out;
- }
- c->user = le32_to_cpu(buf[0]);
- c->role = le32_to_cpu(buf[1]);
- c->type = le32_to_cpu(buf[2]);
- if (p->policyvers >= POLICYDB_VERSION_MLS) {
- rc = mls_read_range_helper(&c->range, fp);
- if (rc) {
- printk(KERN_ERR "SELinux: error reading MLS range of context\n");
- goto out;
- }
- }
- rc = -EINVAL;
- if (!policydb_context_isvalid(p, c)) {
- printk(KERN_ERR "SELinux: invalid security context\n");
- context_destroy(c);
- goto out;
- }
- rc = 0;
- out:
- return rc;
- }
- /*
- * The following *_read functions are used to
- * read the symbol data from a policy database
- * binary representation file.
- */
- static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct perm_datum *perdatum;
- int rc;
- __le32 buf[2];
- u32 len;
- rc = -ENOMEM;
- perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
- if (!perdatum)
- goto bad;
- rc = next_entry(buf, fp, sizeof buf);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- perdatum->value = le32_to_cpu(buf[1]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = hashtab_insert(h, key, perdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- perm_destroy(key, perdatum, NULL);
- return rc;
- }
- static int common_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct common_datum *comdatum;
- __le32 buf[4];
- u32 len, nel;
- int i, rc;
- rc = -ENOMEM;
- comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
- if (!comdatum)
- goto bad;
- rc = next_entry(buf, fp, sizeof buf);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- comdatum->value = le32_to_cpu(buf[1]);
- rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
- if (rc)
- goto bad;
- comdatum->permissions.nprim = le32_to_cpu(buf[2]);
- nel = le32_to_cpu(buf[3]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- for (i = 0; i < nel; i++) {
- rc = perm_read(p, comdatum->permissions.table, fp);
- if (rc)
- goto bad;
- }
- rc = hashtab_insert(h, key, comdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- common_destroy(key, comdatum, NULL);
- return rc;
- }
- static int read_cons_helper(struct constraint_node **nodep, int ncons,
- int allowxtarget, void *fp)
- {
- struct constraint_node *c, *lc;
- struct constraint_expr *e, *le;
- __le32 buf[3];
- u32 nexpr;
- int rc, i, j, depth;
- lc = NULL;
- for (i = 0; i < ncons; i++) {
- c = kzalloc(sizeof(*c), GFP_KERNEL);
- if (!c)
- return -ENOMEM;
- if (lc)
- lc->next = c;
- else
- *nodep = c;
- rc = next_entry(buf, fp, (sizeof(u32) * 2));
- if (rc)
- return rc;
- c->permissions = le32_to_cpu(buf[0]);
- nexpr = le32_to_cpu(buf[1]);
- le = NULL;
- depth = -1;
- for (j = 0; j < nexpr; j++) {
- e = kzalloc(sizeof(*e), GFP_KERNEL);
- if (!e)
- return -ENOMEM;
- if (le)
- le->next = e;
- else
- c->expr = e;
- rc = next_entry(buf, fp, (sizeof(u32) * 3));
- if (rc)
- return rc;
- e->expr_type = le32_to_cpu(buf[0]);
- e->attr = le32_to_cpu(buf[1]);
- e->op = le32_to_cpu(buf[2]);
- switch (e->expr_type) {
- case CEXPR_NOT:
- if (depth < 0)
- return -EINVAL;
- break;
- case CEXPR_AND:
- case CEXPR_OR:
- if (depth < 1)
- return -EINVAL;
- depth--;
- break;
- case CEXPR_ATTR:
- if (depth == (CEXPR_MAXDEPTH - 1))
- return -EINVAL;
- depth++;
- break;
- case CEXPR_NAMES:
- if (!allowxtarget && (e->attr & CEXPR_XTARGET))
- return -EINVAL;
- if (depth == (CEXPR_MAXDEPTH - 1))
- return -EINVAL;
- depth++;
- rc = ebitmap_read(&e->names, fp);
- if (rc)
- return rc;
- break;
- default:
- return -EINVAL;
- }
- le = e;
- }
- if (depth != 0)
- return -EINVAL;
- lc = c;
- }
- return 0;
- }
- static int class_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct class_datum *cladatum;
- __le32 buf[6];
- u32 len, len2, ncons, nel;
- int i, rc;
- rc = -ENOMEM;
- cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
- if (!cladatum)
- goto bad;
- rc = next_entry(buf, fp, sizeof(u32)*6);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- len2 = le32_to_cpu(buf[1]);
- cladatum->value = le32_to_cpu(buf[2]);
- rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
- if (rc)
- goto bad;
- cladatum->permissions.nprim = le32_to_cpu(buf[3]);
- nel = le32_to_cpu(buf[4]);
- ncons = le32_to_cpu(buf[5]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- if (len2) {
- rc = -ENOMEM;
- cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
- if (!cladatum->comkey)
- goto bad;
- rc = next_entry(cladatum->comkey, fp, len2);
- if (rc)
- goto bad;
- cladatum->comkey[len2] = '\0';
- rc = -EINVAL;
- cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
- if (!cladatum->comdatum) {
- printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
- goto bad;
- }
- }
- for (i = 0; i < nel; i++) {
- rc = perm_read(p, cladatum->permissions.table, fp);
- if (rc)
- goto bad;
- }
- rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
- if (rc)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
- /* grab the validatetrans rules */
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto bad;
- ncons = le32_to_cpu(buf[0]);
- rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
- if (rc)
- goto bad;
- }
- rc = hashtab_insert(h, key, cladatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- cls_destroy(key, cladatum, NULL);
- return rc;
- }
- static int role_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct role_datum *role;
- int rc, to_read = 2;
- __le32 buf[3];
- u32 len;
- rc = -ENOMEM;
- role = kzalloc(sizeof(*role), GFP_KERNEL);
- if (!role)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
- to_read = 3;
- rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- role->value = le32_to_cpu(buf[1]);
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
- role->bounds = le32_to_cpu(buf[2]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = ebitmap_read(&role->dominates, fp);
- if (rc)
- goto bad;
- rc = ebitmap_read(&role->types, fp);
- if (rc)
- goto bad;
- if (strcmp(key, OBJECT_R) == 0) {
- rc = -EINVAL;
- if (role->value != OBJECT_R_VAL) {
- printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
- OBJECT_R, role->value);
- goto bad;
- }
- rc = 0;
- goto bad;
- }
- rc = hashtab_insert(h, key, role);
- if (rc)
- goto bad;
- return 0;
- bad:
- role_destroy(key, role, NULL);
- return rc;
- }
- static int type_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct type_datum *typdatum;
- int rc, to_read = 3;
- __le32 buf[4];
- u32 len;
- rc = -ENOMEM;
- typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
- if (!typdatum)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
- to_read = 4;
- rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- typdatum->value = le32_to_cpu(buf[1]);
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
- u32 prop = le32_to_cpu(buf[2]);
- if (prop & TYPEDATUM_PROPERTY_PRIMARY)
- typdatum->primary = 1;
- if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
- typdatum->attribute = 1;
- typdatum->bounds = le32_to_cpu(buf[3]);
- } else {
- typdatum->primary = le32_to_cpu(buf[2]);
- }
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = hashtab_insert(h, key, typdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- type_destroy(key, typdatum, NULL);
- return rc;
- }
- /*
- * Read a MLS level structure from a policydb binary
- * representation file.
- */
- static int mls_read_level(struct mls_level *lp, void *fp)
- {
- __le32 buf[1];
- int rc;
- memset(lp, 0, sizeof(*lp));
- rc = next_entry(buf, fp, sizeof buf);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: truncated level\n");
- return rc;
- }
- lp->sens = le32_to_cpu(buf[0]);
- rc = ebitmap_read(&lp->cat, fp);
- if (rc) {
- printk(KERN_ERR "SELinux: mls: error reading level categories\n");
- return rc;
- }
- return 0;
- }
- static int user_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct user_datum *usrdatum;
- int rc, to_read = 2;
- __le32 buf[3];
- u32 len;
- rc = -ENOMEM;
- usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
- if (!usrdatum)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
- to_read = 3;
- rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- usrdatum->value = le32_to_cpu(buf[1]);
- if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
- usrdatum->bounds = le32_to_cpu(buf[2]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_KERNEL);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = ebitmap_read(&usrdatum->roles, fp);
- if (rc)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_MLS) {
- rc = mls_read_range_helper(&usrdatum->range, fp);
- if (rc)
- goto bad;
- rc = mls_read_level(&usrdatum->dfltlevel, fp);
- if (rc)
- goto bad;
- }
- rc = hashtab_insert(h, key, usrdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- user_destroy(key, usrdatum, NULL);
- return rc;
- }
- static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct level_datum *levdatum;
- int rc;
- __le32 buf[2];
- u32 len;
- rc = -ENOMEM;
- levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
- if (!levdatum)
- goto bad;
- rc = next_entry(buf, fp, sizeof buf);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- levdatum->isalias = le32_to_cpu(buf[1]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_ATOMIC);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = -ENOMEM;
- levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
- if (!levdatum->level)
- goto bad;
- rc = mls_read_level(levdatum->level, fp);
- if (rc)
- goto bad;
- rc = hashtab_insert(h, key, levdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- sens_destroy(key, levdatum, NULL);
- return rc;
- }
- static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
- {
- char *key = NULL;
- struct cat_datum *catdatum;
- int rc;
- __le32 buf[3];
- u32 len;
- rc = -ENOMEM;
- catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
- if (!catdatum)
- goto bad;
- rc = next_entry(buf, fp, sizeof buf);
- if (rc)
- goto bad;
- len = le32_to_cpu(buf[0]);
- catdatum->value = le32_to_cpu(buf[1]);
- catdatum->isalias = le32_to_cpu(buf[2]);
- rc = -ENOMEM;
- key = kmalloc(len + 1, GFP_ATOMIC);
- if (!key)
- goto bad;
- rc = next_entry(key, fp, len);
- if (rc)
- goto bad;
- key[len] = '\0';
- rc = hashtab_insert(h, key, catdatum);
- if (rc)
- goto bad;
- return 0;
- bad:
- cat_destroy(key, catdatum, NULL);
- return rc;
- }
- static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
- {
- common_read,
- class_read,
- role_read,
- type_read,
- user_read,
- cond_read_bool,
- sens_read,
- cat_read,
- };
- static int user_bounds_sanity_check(void *key, void *datum, void *datap)
- {
- struct user_datum *upper, *user;
- struct policydb *p = datap;
- int depth = 0;
- upper = user = datum;
- while (upper->bounds) {
- struct ebitmap_node *node;
- unsigned long bit;
- if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
- printk(KERN_ERR "SELinux: user %s: "
- "too deep or looped boundary",
- (char *) key);
- return -EINVAL;
- }
- upper = p->user_val_to_struct[upper->bounds - 1];
- ebitmap_for_each_positive_bit(&user->roles, node, bit) {
- if (ebitmap_get_bit(&upper->roles, bit))
- continue;
- printk(KERN_ERR
- "SELinux: boundary violated policy: "
- "user=%s role=%s bounds=%s\n",
- sym_name(p, SYM_USERS, user->value - 1),
- sym_name(p, SYM_ROLES, bit),
- sym_name(p, SYM_USERS, upper->value - 1));
- return -EINVAL;
- }
- }
- return 0;
- }
- static int role_bounds_sanity_check(void *key, void *datum, void *datap)
- {
- struct role_datum *upper, *role;
- struct policydb *p = datap;
- int depth = 0;
- upper = role = datum;
- while (upper->bounds) {
- struct ebitmap_node *node;
- unsigned long bit;
- if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
- printk(KERN_ERR "SELinux: role %s: "
- "too deep or looped bounds\n",
- (char *) key);
- return -EINVAL;
- }
- upper = p->role_val_to_struct[upper->bounds - 1];
- ebitmap_for_each_positive_bit(&role->types, node, bit) {
- if (ebitmap_get_bit(&upper->types, bit))
- continue;
- printk(KERN_ERR
- "SELinux: boundary violated policy: "
- "role=%s type=%s bounds=%s\n",
- sym_name(p, SYM_ROLES, role->value - 1),
- sym_name(p, SYM_TYPES, bit),
- sym_name(p, SYM_ROLES, upper->value - 1));
- return -EINVAL;
- }
- }
- return 0;
- }
- static int type_bounds_sanity_check(void *key, void *datum, void *datap)
- {
- struct type_datum *upper;
- struct policydb *p = datap;
- int depth = 0;
- upper = datum;
- while (upper->bounds) {
- if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
- printk(KERN_ERR "SELinux: type %s: "
- "too deep or looped boundary\n",
- (char *) key);
- return -EINVAL;
- }
- upper = flex_array_get_ptr(p->type_val_to_struct_array,
- upper->bounds - 1);
- BUG_ON(!upper);
- if (upper->attribute) {
- printk(KERN_ERR "SELinux: type %s: "
- "bounded by attribute %s",
- (char *) key,
- sym_name(p, SYM_TYPES, upper->value - 1));
- return -EINVAL;
- }
- }
- return 0;
- }
- static int policydb_bounds_sanity_check(struct policydb *p)
- {
- int rc;
- if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
- return 0;
- rc = hashtab_map(p->p_users.table,
- user_bounds_sanity_check, p);
- if (rc)
- return rc;
- rc = hashtab_map(p->p_roles.table,
- role_bounds_sanity_check, p);
- if (rc)
- return rc;
- rc = hashtab_map(p->p_types.table,
- type_bounds_sanity_check, p);
- if (rc)
- return rc;
- return 0;
- }
- extern int ss_initialized;
- u16 string_to_security_class(struct policydb *p, const char *name)
- {
- struct class_datum *cladatum;
- cladatum = hashtab_search(p->p_classes.table, name);
- if (!cladatum)
- return 0;
- return cladatum->value;
- }
- u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
- {
- struct class_datum *cladatum;
- struct perm_datum *perdatum = NULL;
- struct common_datum *comdatum;
- if (!tclass || tclass > p->p_classes.nprim)
- return 0;
- cladatum = p->class_val_to_struct[tclass-1];
- comdatum = cladatum->comdatum;
- if (comdatum)
- perdatum = hashtab_search(comdatum->permissions.table,
- name);
- if (!perdatum)
- perdatum = hashtab_search(cladatum->permissions.table,
- name);
- if (!perdatum)
- return 0;
- return 1U << (perdatum->value-1);
- }
- static int range_read(struct policydb *p, void *fp)
- {
- struct range_trans *rt = NULL;
- struct mls_range *r = NULL;
- int i, rc;
- __le32 buf[2];
- u32 nel;
- if (p->policyvers < POLICYDB_VERSION_MLS)
- return 0;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- nel = le32_to_cpu(buf[0]);
- for (i = 0; i < nel; i++) {
- rc = -ENOMEM;
- rt = kzalloc(sizeof(*rt), GFP_KERNEL);
- if (!rt)
- goto out;
- rc = next_entry(buf, fp, (sizeof(u32) * 2));
- if (rc)
- goto out;
- rt->source_type = le32_to_cpu(buf[0]);
- rt->target_type = le32_to_cpu(buf[1]);
- if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- rt->target_class = le32_to_cpu(buf[0]);
- } else
- rt->target_class = p->process_class;
- rc = -EINVAL;
- if (!policydb_type_isvalid(p, rt->source_type) ||
- !policydb_type_isvalid(p, rt->target_type) ||
- !policydb_class_isvalid(p, rt->target_class))
- goto out;
- rc = -ENOMEM;
- r = kzalloc(sizeof(*r), GFP_KERNEL);
- if (!r)
- goto out;
- rc = mls_read_range_helper(r, fp);
- if (rc)
- goto out;
- rc = -EINVAL;
- if (!mls_range_isvalid(p, r)) {
- printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
- goto out;
- }
- rc = hashtab_insert(p->range_tr, rt, r);
- if (rc)
- goto out;
- rt = NULL;
- r = NULL;
- }
- hash_eval(p->range_tr, "rangetr");
- rc = 0;
- out:
- kfree(rt);
- kfree(r);
- return rc;
- }
- static int filename_trans_read(struct policydb *p, void *fp)
- {
- struct filename_trans *ft;
- struct filename_trans_datum *otype;
- char *name;
- u32 nel, len;
- __le32 buf[4];
- int rc, i;
- if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
- return 0;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- return rc;
- nel = le32_to_cpu(buf[0]);
- for (i = 0; i < nel; i++) {
- ft = NULL;
- otype = NULL;
- name = NULL;
- rc = -ENOMEM;
- ft = kzalloc(sizeof(*ft), GFP_KERNEL);
- if (!ft)
- goto out;
- rc = -ENOMEM;
- otype = kmalloc(sizeof(*otype), GFP_KERNEL);
- if (!otype)
- goto out;
- /* length of the path component string */
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- len = le32_to_cpu(buf[0]);
- rc = -ENOMEM;
- name = kmalloc(len + 1, GFP_KERNEL);
- if (!name)
- goto out;
- ft->name = name;
- /* path component string */
- rc = next_entry(name, fp, len);
- if (rc)
- goto out;
- name[len] = 0;
- rc = next_entry(buf, fp, sizeof(u32) * 4);
- if (rc)
- goto out;
- ft->stype = le32_to_cpu(buf[0]);
- ft->ttype = le32_to_cpu(buf[1]);
- ft->tclass = le32_to_cpu(buf[2]);
- otype->otype = le32_to_cpu(buf[3]);
- rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
- if (rc)
- goto out;
- hashtab_insert(p->filename_trans, ft, otype);
- }
- hash_eval(p->filename_trans, "filenametr");
- return 0;
- out:
- kfree(ft);
- kfree(name);
- kfree(otype);
- return rc;
- }
- static int genfs_read(struct policydb *p, void *fp)
- {
- int i, j, rc;
- u32 nel, nel2, len, len2;
- __le32 buf[1];
- struct ocontext *l, *c;
- struct ocontext *newc = NULL;
- struct genfs *genfs_p, *genfs;
- struct genfs *newgenfs = NULL;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- nel = le32_to_cpu(buf[0]);
- for (i = 0; i < nel; i++) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- len = le32_to_cpu(buf[0]);
- rc = -ENOMEM;
- newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
- if (!newgenfs)
- goto out;
- rc = -ENOMEM;
- newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
- if (!newgenfs->fstype)
- goto out;
- rc = next_entry(newgenfs->fstype, fp, len);
- if (rc)
- goto out;
- newgenfs->fstype[len] = 0;
- for (genfs_p = NULL, genfs = p->genfs; genfs;
- genfs_p = genfs, genfs = genfs->next) {
- rc = -EINVAL;
- if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
- printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
- newgenfs->fstype);
- goto out;
- }
- if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
- break;
- }
- newgenfs->next = genfs;
- if (genfs_p)
- genfs_p->next = newgenfs;
- else
- p->genfs = newgenfs;
- genfs = newgenfs;
- newgenfs = NULL;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- nel2 = le32_to_cpu(buf[0]);
- for (j = 0; j < nel2; j++) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- len = le32_to_cpu(buf[0]);
- rc = -ENOMEM;
- newc = kzalloc(sizeof(*newc), GFP_KERNEL);
- if (!newc)
- goto out;
- rc = -ENOMEM;
- newc->u.name = kmalloc(len + 1, GFP_KERNEL);
- if (!newc->u.name)
- goto out;
- rc = next_entry(newc->u.name, fp, len);
- if (rc)
- goto out;
- newc->u.name[len] = 0;
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- newc->v.sclass = le32_to_cpu(buf[0]);
- rc = context_read_and_validate(&newc->context[0], p, fp);
- if (rc)
- goto out;
- for (l = NULL, c = genfs->head; c;
- l = c, c = c->next) {
- rc = -EINVAL;
- if (!strcmp(newc->u.name, c->u.name) &&
- (!c->v.sclass || !newc->v.sclass ||
- newc->v.sclass == c->v.sclass)) {
- printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
- genfs->fstype, c->u.name);
- goto out;
- }
- len = strlen(newc->u.name);
- len2 = strlen(c->u.name);
- if (len > len2)
- break;
- }
- newc->next = c;
- if (l)
- l->next = newc;
- else
- genfs->head = newc;
- newc = NULL;
- }
- }
- rc = 0;
- out:
- if (newgenfs)
- kfree(newgenfs->fstype);
- kfree(newgenfs);
- ocontext_destroy(newc, OCON_FSUSE);
- return rc;
- }
- static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
- void *fp)
- {
- int i, j, rc;
- u32 nel, len;
- __le32 buf[3];
- struct ocontext *l, *c;
- u32 nodebuf[8];
- for (i = 0; i < info->ocon_num; i++) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- nel = le32_to_cpu(buf[0]);
- l = NULL;
- for (j = 0; j < nel; j++) {
- rc = -ENOMEM;
- c = kzalloc(sizeof(*c), GFP_KERNEL);
- if (!c)
- goto out;
- if (l)
- l->next = c;
- else
- p->ocontexts[i] = c;
- l = c;
- switch (i) {
- case OCON_ISID:
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- c->sid[0] = le32_to_cpu(buf[0]);
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- break;
- case OCON_FS:
- case OCON_NETIF:
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto out;
- len = le32_to_cpu(buf[0]);
- rc = -ENOMEM;
- c->u.name = kmalloc(len + 1, GFP_KERNEL);
- if (!c->u.name)
- goto out;
- rc = next_entry(c->u.name, fp, len);
- if (rc)
- goto out;
- c->u.name[len] = 0;
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- rc = context_read_and_validate(&c->context[1], p, fp);
- if (rc)
- goto out;
- break;
- case OCON_PORT:
- rc = next_entry(buf, fp, sizeof(u32)*3);
- if (rc)
- goto out;
- c->u.port.protocol = le32_to_cpu(buf[0]);
- c->u.port.low_port = le32_to_cpu(buf[1]);
- c->u.port.high_port = le32_to_cpu(buf[2]);
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- break;
- case OCON_NODE:
- rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
- if (rc)
- goto out;
- c->u.node.addr = nodebuf[0]; /* network order */
- c->u.node.mask = nodebuf[1]; /* network order */
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- break;
- case OCON_FSUSE:
- rc = next_entry(buf, fp, sizeof(u32)*2);
- if (rc)
- goto out;
- rc = -EINVAL;
- c->v.behavior = le32_to_cpu(buf[0]);
- if (c->v.behavior > SECURITY_FS_USE_NONE)
- goto out;
- rc = -ENOMEM;
- len = le32_to_cpu(buf[1]);
- c->u.name = kmalloc(len + 1, GFP_KERNEL);
- if (!c->u.name)
- goto out;
- rc = next_entry(c->u.name, fp, len);
- if (rc)
- goto out;
- c->u.name[len] = 0;
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- break;
- case OCON_NODE6: {
- int k;
- rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
- if (rc)
- goto out;
- for (k = 0; k < 4; k++)
- c->u.node6.addr[k] = nodebuf[k];
- for (k = 0; k < 4; k++)
- c->u.node6.mask[k] = nodebuf[k+4];
- rc = context_read_and_validate(&c->context[0], p, fp);
- if (rc)
- goto out;
- break;
- }
- }
- }
- }
- rc = 0;
- out:
- return rc;
- }
- /*
- * Read the configuration data from a policy database binary
- * representation file into a policy database structure.
- */
- int policydb_read(struct policydb *p, void *fp)
- {
- struct role_allow *ra, *lra;
- struct role_trans *tr, *ltr;
- int i, j, rc;
- __le32 buf[4];
- u32 len, nprim, nel;
- char *policydb_str;
- struct policydb_compat_info *info;
- rc = policydb_init(p);
- if (rc)
- return rc;
- /* Read the magic number and string length. */
- rc = next_entry(buf, fp, sizeof(u32) * 2);
- if (rc)
- goto bad;
- rc = -EINVAL;
- if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
- printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
- "not match expected magic number 0x%x\n",
- le32_to_cpu(buf[0]), POLICYDB_MAGIC);
- goto bad;
- }
- rc = -EINVAL;
- len = le32_to_cpu(buf[1]);
- if (len != strlen(POLICYDB_STRING)) {
- printk(KERN_ERR "SELinux: policydb string length %d does not "
- "match expected length %Zu\n",
- len, strlen(POLICYDB_STRING));
- goto bad;
- }
- rc = -ENOMEM;
- policydb_str = kmalloc(len + 1, GFP_KERNEL);
- if (!policydb_str) {
- printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
- "string of length %d\n", len);
- goto bad;
- }
- rc = next_entry(policydb_str, fp, len);
- if (rc) {
- printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
- kfree(policydb_str);
- goto bad;
- }
- rc = -EINVAL;
- policydb_str[len] = '\0';
- if (strcmp(policydb_str, POLICYDB_STRING)) {
- printk(KERN_ERR "SELinux: policydb string %s does not match "
- "my string %s\n", policydb_str, POLICYDB_STRING);
- kfree(policydb_str);
- goto bad;
- }
- /* Done with policydb_str. */
- kfree(policydb_str);
- policydb_str = NULL;
- /* Read the version and table sizes. */
- rc = next_entry(buf, fp, sizeof(u32)*4);
- if (rc)
- goto bad;
- rc = -EINVAL;
- p->policyvers = le32_to_cpu(buf[0]);
- if (p->policyvers < POLICYDB_VERSION_MIN ||
- p->policyvers > POLICYDB_VERSION_MAX) {
- printk(KERN_ERR "SELinux: policydb version %d does not match "
- "my version range %d-%d\n",
- le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
- goto bad;
- }
- if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
- p->mls_enabled = 1;
- rc = -EINVAL;
- if (p->policyvers < POLICYDB_VERSION_MLS) {
- printk(KERN_ERR "SELinux: security policydb version %d "
- "(MLS) not backwards compatible\n",
- p->policyvers);
- goto bad;
- }
- }
- p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
- p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
- if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
- rc = ebitmap_read(&p->policycaps, fp);
- if (rc)
- goto bad;
- }
- if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
- rc = ebitmap_read(&p->permissive_map, fp);
- if (rc)
- goto bad;
- }
- rc = -EINVAL;
- info = policydb_lookup_compat(p->policyvers);
- if (!info) {
- printk(KERN_ERR "SELinux: unable to find policy compat info "
- "for version %d\n", p->policyvers);
- goto bad;
- }
- rc = -EINVAL;
- if (le32_to_cpu(buf[2]) != info->sym_num ||
- le32_to_cpu(buf[3]) != info->ocon_num) {
- printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
- "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
- le32_to_cpu(buf[3]),
- info->sym_num, info->ocon_num);
- goto bad;
- }
- for (i = 0; i < info->sym_num; i++) {
- rc = next_entry(buf, fp, sizeof(u32)*2);
- if (rc)
- goto bad;
- nprim = le32_to_cpu(buf[0]);
- nel = le32_to_cpu(buf[1]);
- for (j = 0; j < nel; j++) {
- rc = read_f[i](p, p->symtab[i].table, fp);
- if (rc)
- goto bad;
- }
- p->symtab[i].nprim = nprim;
- }
- rc = -EINVAL;
- p->process_class = string_to_security_class(p, "process");
- if (!p->process_class)
- goto bad;
- rc = avtab_read(&p->te_avtab, fp, p);
- if (rc)
- goto bad;
- if (p->policyvers >= POLICYDB_VERSION_BOOL) {
- rc = cond_read_list(p, fp);
- if (rc)
- goto bad;
- }
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto bad;
- nel = le32_to_cpu(buf[0]);
- ltr = NULL;
- for (i = 0; i < nel; i++) {
- rc = -ENOMEM;
- tr = kzalloc(sizeof(*tr), GFP_KERNEL);
- if (!tr)
- goto bad;
- if (ltr)
- ltr->next = tr;
- else
- p->role_tr = tr;
- rc = next_entry(buf, fp, sizeof(u32)*3);
- if (rc)
- goto bad;
- rc = -EINVAL;
- tr->role = le32_to_cpu(buf[0]);
- tr->type = le32_to_cpu(buf[1]);
- tr->new_role = le32_to_cpu(buf[2]);
- if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto bad;
- tr->tclass = le32_to_cpu(buf[0]);
- } else
- tr->tclass = p->process_class;
- if (!policydb_role_isvalid(p, tr->role) ||
- !policydb_type_isvalid(p, tr->type) ||
- !policydb_class_isvalid(p, tr->tclass) ||
- !policydb_role_isvalid(p, tr->new_role))
- goto bad;
- ltr = tr;
- }
- rc = next_entry(buf, fp, sizeof(u32));
- if (rc)
- goto bad;
- nel = le32_to_cpu(buf[0]);
- lra = NULL;
- for (i = 0; i < nel; i++) {
- rc = -ENOMEM;
- ra = kzalloc(sizeof(*ra), GFP_KERNEL);
- if (!ra)
- goto bad;
- if (lra)
- lra->next = ra;
- else
- p->role_allow = ra;
- rc = next_entry(buf, fp, sizeof(u32)*2);
- if (rc)
- goto bad;
- rc = -EINVAL;
- ra->role = le32_to_cpu(buf[0]);
- ra->new_role = le32_to_cpu(buf[1]);
- if (!policydb_role_isvalid(p, ra->role) ||
- !policydb_role_isvalid(p, ra->new_role))
- goto bad;
- lra = ra;
- }
- rc = filename_trans_read(p, fp);
- if (rc)
- goto bad;
- rc = policydb_index(p);
- if (rc)
- goto bad;
- rc = -EINVAL;
- p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
- p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
- if (!p->process_trans_perms)
- goto bad;
- rc = ocontext_read(p, info, fp);
- if (rc)
- goto bad;
- rc = genfs_read(p, fp);
- if (rc)
- goto bad;
- rc = range_read(p, fp);
- if (rc)
- goto bad;
- rc = -ENOMEM;
- p->type_attr_map_array = flex_arra