501 lines
12 KiB
C
501 lines
12 KiB
C
#include "sepolicy-inject.h"
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static void *cmalloc(size_t s) {
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void *t = malloc(s);
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if (t == NULL) {
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fprintf(stderr, "Out of memory\n");
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exit(1);
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}
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return t;
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}
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static int get_attr(char *type, int value) {
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type_datum_t *attr = hashtab_search(policy->p_types.table, type);
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if (!attr)
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exit(1);
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if (attr->flavor != TYPE_ATTRIB)
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exit(1);
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return !! ebitmap_get_bit(&policy->attr_type_map[attr->s.value-1], value-1);
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//return !! ebitmap_get_bit(&policy->type_attr_map[value-1], attr->s.value-1);
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}
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static int get_attr_id(char *type) {
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type_datum_t *attr = hashtab_search(policy->p_types.table, type);
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if (!attr)
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exit(1);
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if (attr->flavor != TYPE_ATTRIB)
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exit(1);
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return attr->s.value;
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}
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static int set_attr(char *type, int value) {
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type_datum_t *attr = hashtab_search(policy->p_types.table, type);
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if (!attr)
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exit(1);
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if (attr->flavor != TYPE_ATTRIB)
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exit(1);
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if(ebitmap_set_bit(&policy->type_attr_map[value-1], attr->s.value-1, 1))
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exit(1);
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if(ebitmap_set_bit(&policy->attr_type_map[attr->s.value-1], value-1, 1))
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exit(1);
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return 0;
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}
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static int add_irule(int s, int t, int c, int p, int effect, int not) {
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avtab_datum_t *av;
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avtab_key_t key;
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key.source_type = s;
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key.target_type = t;
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key.target_class = c;
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key.specified = effect;
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av = avtab_search(&policy->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof(*av));
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av->data |= 1U << (p - 1);
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int ret = avtab_insert(&policy->te_avtab, &key, av);
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if (ret) {
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fprintf(stderr, "Error inserting into avtab\n");
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return 1;
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}
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}
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if(not)
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av->data &= ~(1U << (p - 1));
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else
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av->data |= 1U << (p - 1);
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return 0;
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}
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static int add_rule_auto(type_datum_t *src, type_datum_t *tgt, class_datum_t *cls, perm_datum_t *perm, int effect, int not) {
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hashtab_t type_table, class_table, perm_table;
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hashtab_ptr_t cur;
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type_table = policy->p_types.table;
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class_table = policy->p_classes.table;
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if (src == NULL) {
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for (int i = 0; i < type_table->size; ++i) {
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cur = type_table->htable[i];
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while (cur != NULL) {
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src = cur->datum;
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if(add_rule_auto(src, tgt, cls, perm, effect, not))
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return 1;
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cur = cur->next;
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}
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}
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} else if (tgt == NULL) {
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for (int i = 0; i < type_table->size; ++i) {
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cur = type_table->htable[i];
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while (cur != NULL) {
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tgt = cur->datum;
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if(add_rule_auto(src, tgt, cls, perm, effect, not))
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return 1;
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cur = cur->next;
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}
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}
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} else if (cls == NULL) {
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for (int i = 0; i < class_table->size; ++i) {
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cur = class_table->htable[i];
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while (cur != NULL) {
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cls = cur->datum;
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if(add_rule_auto(src, tgt, cls, perm, effect, not))
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return 1;
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cur = cur->next;
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}
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}
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} else if (perm == NULL) {
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perm_table = cls->permissions.table;
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for (int i = 0; i < perm_table->size; ++i) {
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cur = perm_table->htable[i];
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while (cur != NULL) {
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perm = cur->datum;
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if(add_irule(src->s.value, tgt->s.value, cls->s.value, perm->s.value, effect, not))
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return 1;
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cur = cur->next;
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}
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}
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if (cls->comdatum != NULL) {
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perm_table = cls->comdatum->permissions.table;
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for (int i = 0; i < perm_table->size; ++i) {
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cur = perm_table->htable[i];
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while (cur != NULL) {
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perm = cur->datum;
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if(add_irule(src->s.value, tgt->s.value, cls->s.value, perm->s.value, effect, not))
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return 1;
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cur = cur->next;
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}
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}
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}
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} else {
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return add_irule(src->s.value, tgt->s.value, cls->s.value, perm->s.value, effect, not);
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}
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return 0;
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}
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int load_policy(char *filename, policydb_t *policydb, struct policy_file *pf) {
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int fd;
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struct stat sb;
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void *map;
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int ret;
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Can't open '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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if (fstat(fd, &sb) < 0) {
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fprintf(stderr, "Can't stat '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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map = mmap(NULL, sb.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
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fd, 0);
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if (map == MAP_FAILED) {
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fprintf(stderr, "Can't mmap '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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policy_file_init(pf);
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pf->type = PF_USE_MEMORY;
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pf->data = map;
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pf->len = sb.st_size;
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if (policydb_init(policydb)) {
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fprintf(stderr, "policydb_init: Out of memory!\n");
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return 1;
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}
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ret = policydb_read(policydb, pf, 1);
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if (ret) {
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fprintf(stderr, "error(s) encountered while parsing configuration\n");
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return 1;
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}
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return 0;
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}
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void create_domain(char *d) {
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symtab_datum_t *src = hashtab_search(policy->p_types.table, d);
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if(src)
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return;
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type_datum_t *typdatum = (type_datum_t *) malloc(sizeof(type_datum_t));
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type_datum_init(typdatum);
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typdatum->primary = 1;
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typdatum->flavor = TYPE_TYPE;
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uint32_t value = 0;
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int r = symtab_insert(policy, SYM_TYPES, strdup(d), typdatum, SCOPE_DECL, 1, &value);
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typdatum->s.value = value;
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fprintf(stderr, "source type %s does not exist: %d,%d\n", d, r, value);
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if (ebitmap_set_bit(&policy->global->branch_list->declared.scope[SYM_TYPES], value - 1, 1)) {
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exit(1);
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}
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policy->type_attr_map = realloc(policy->type_attr_map, sizeof(ebitmap_t)*policy->p_types.nprim);
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policy->attr_type_map = realloc(policy->attr_type_map, sizeof(ebitmap_t)*policy->p_types.nprim);
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ebitmap_init(&policy->type_attr_map[value-1]);
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ebitmap_init(&policy->attr_type_map[value-1]);
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ebitmap_set_bit(&policy->type_attr_map[value-1], value-1, 1);
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//Add the domain to all roles
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for(unsigned i=0; i<policy->p_roles.nprim; ++i) {
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//Not sure all those three calls are needed
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ebitmap_set_bit(&policy->role_val_to_struct[i]->types.negset, value-1, 0);
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ebitmap_set_bit(&policy->role_val_to_struct[i]->types.types, value-1, 1);
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type_set_expand(&policy->role_val_to_struct[i]->types, &policy->role_val_to_struct[i]->cache, policy, 0);
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}
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src = hashtab_search(policy->p_types.table, d);
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if(!src)
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exit(1);
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extern int policydb_index_decls(policydb_t * p);
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if(policydb_index_decls(policy))
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exit(1);
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if(policydb_index_classes(policy))
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exit(1);
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if(policydb_index_others(NULL, policy, 1))
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exit(1);
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set_attr("domain", value);
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}
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int add_typerule(char *s, char *targetAttribute, char **minusses, char *c, char *p, int effect, int not) {
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type_datum_t *src, *tgt;
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class_datum_t *cls;
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perm_datum_t *perm;
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//64(0kB) should be enough for everyone, right?
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int m[64] = { -1 };
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src = hashtab_search(policy->p_types.table, s);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", s);
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return 1;
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}
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tgt = hashtab_search(policy->p_types.table, targetAttribute);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", targetAttribute);
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return 1;
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}
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if(tgt->flavor != TYPE_ATTRIB)
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exit(1);
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for(int i=0; minusses && minusses[i]; ++i) {
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type_datum_t *obj;
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obj = hashtab_search(policy->p_types.table, minusses[i]);
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if (obj == NULL) {
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fprintf(stderr, "minus type %s does not exist\n", minusses[i]);
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return 1;
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}
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m[i] = obj->s.value-1;
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m[i+1] = -1;
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}
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cls = hashtab_search(policy->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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perm = hashtab_search(cls->permissions.table, p);
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if (perm == NULL) {
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if (cls->comdatum == NULL) {
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fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
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return 1;
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}
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perm = hashtab_search(cls->comdatum->permissions.table, p);
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if (perm == NULL) {
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fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
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return 1;
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}
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}
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ebitmap_node_t *node;
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int i;
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int ret = 0;
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ebitmap_for_each_bit(&policy->attr_type_map[tgt->s.value-1], node, i) {
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if(ebitmap_node_get_bit(node, i)) {
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int found = 0;
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for(int j=0; m[j] != -1; ++j) {
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if(i == m[j])
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found = 1;
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}
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if(!found)
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ret |= add_irule(src->s.value, i+1, cls->s.value, perm->s.value, effect, not);
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}
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}
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return ret;
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}
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int add_transition(char *srcS, char *origS, char *tgtS, char *c) {
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type_datum_t *src, *tgt, *orig;
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class_datum_t *cls;
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avtab_datum_t *av;
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avtab_key_t key;
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src = hashtab_search(policy->p_types.table, srcS);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", srcS);
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return 1;
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}
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tgt = hashtab_search(policy->p_types.table, tgtS);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", tgtS);
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return 1;
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}
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cls = hashtab_search(policy->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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orig = hashtab_search(policy->p_types.table, origS);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", origS);
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return 1;
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}
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key.source_type = src->s.value;
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key.target_type = orig->s.value;
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key.target_class = cls->s.value;
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key.specified = AVTAB_TRANSITION;
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av = avtab_search(&policy->te_avtab, &key);
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if (av == NULL) {
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av = cmalloc(sizeof(*av));
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av->data = tgt->s.value;
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int ret = avtab_insert(&policy->te_avtab, &key, av);
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if (ret) {
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fprintf(stderr, "Error inserting into avtab\n");
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return 1;
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}
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} else {
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fprintf(stderr, "Warning, rule already defined! Won't override.\n");
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fprintf(stderr, "Previous value = %d, wanted value = %d\n", av->data, tgt->s.value);
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}
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return 0;
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}
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int add_file_transition(char *srcS, char *origS, char *tgtS, char *c, char* filename) {
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type_datum_t *src, *tgt, *orig;
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class_datum_t *cls;
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src = hashtab_search(policy->p_types.table, srcS);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", srcS);
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return 1;
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}
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tgt = hashtab_search(policy->p_types.table, tgtS);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", tgtS);
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return 1;
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}
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cls = hashtab_search(policy->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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orig = hashtab_search(policy->p_types.table, origS);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", origS);
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return 1;
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}
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filename_trans_t *new_transition = cmalloc(sizeof(*new_transition));
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new_transition->stype = src->s.value;
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new_transition->ttype = orig->s.value;
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new_transition->tclass = cls->s.value;
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new_transition->otype = tgt->s.value;
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new_transition->name = strdup(filename);
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new_transition->next = policy->filename_trans;
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policy->filename_trans = new_transition;
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return 0;
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}
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int add_typeattribute(char *domainS, char *typeS) {
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type_datum_t *domain;
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domain = hashtab_search(policy->p_types.table, domainS);
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if (domain == NULL) {
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fprintf(stderr, "source type %s does not exist\n", domainS);
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return 1;
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}
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set_attr(typeS, domain->s.value);
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int typeId = get_attr_id(typeS);
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//Now let's update all constraints!
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//(kernel doesn't support (yet?) type_names rules)
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for(int i=0; i<policy->p_classes.nprim; ++i) {
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class_datum_t *cl = policy->class_val_to_struct[i];
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for(constraint_node_t *n = cl->constraints; n ; n=n->next) {
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for(constraint_expr_t *e = n->expr; e; e=e->next) {
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if(e->expr_type == CEXPR_NAMES) {
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if(ebitmap_get_bit(&e->type_names->types, typeId-1)) {
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ebitmap_set_bit(&e->names, domain->s.value-1, 1);
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}
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}
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}
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}
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}
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return 0;
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}
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int add_rule(char *s, char *t, char *c, char *p, int effect, int not) {
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type_datum_t *src = NULL, *tgt = NULL;
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class_datum_t *cls = NULL;
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perm_datum_t *perm = NULL;
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if (s) {
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src = hashtab_search(policy->p_types.table, s);
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if (src == NULL) {
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fprintf(stderr, "source type %s does not exist\n", s);
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return 1;
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}
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}
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if (t) {
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tgt = hashtab_search(policy->p_types.table, t);
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if (tgt == NULL) {
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fprintf(stderr, "target type %s does not exist\n", t);
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return 1;
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}
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}
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if (c) {
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cls = hashtab_search(policy->p_classes.table, c);
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if (cls == NULL) {
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fprintf(stderr, "class %s does not exist\n", c);
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return 1;
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}
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}
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if (p) {
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if (c == NULL) {
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fprintf(stderr, "No class is specified, cannot add perm [%s] \n", p);
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return 1;
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}
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if (cls != NULL) {
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perm = hashtab_search(cls->permissions.table, p);
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if (perm == NULL && cls->comdatum != NULL) {
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perm = hashtab_search(cls->comdatum->permissions.table, p);
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}
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if (perm == NULL) {
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fprintf(stderr, "perm %s does not exist in class %s\n", p, c);
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return 1;
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}
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}
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}
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return add_rule_auto(src, tgt, cls, perm, effect, not);
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}
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int live_patch() {
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char *filename = "/sys/fs/selinux/load";
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int fd, ret;
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void *data = NULL;
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size_t len;
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policydb_to_image(NULL, policy, &data, &len);
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if (data == NULL) fprintf(stderr, "Error!");
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// based on libselinux security_load_policy()
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fd = open(filename, O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "Can't open '%s': %s\n",
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filename, strerror(errno));
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return 1;
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}
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ret = write(fd, data, len);
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close(fd);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Could not write policy to %s\n",
|
|
filename);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|