kernel: improve selinux for su context
This commit is contained in:
weishu
357
kernel/selinux/sepolicy.c
Normal file
357
kernel/selinux/sepolicy.c
Normal file
@@ -0,0 +1,357 @@
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#include "sepolicy.h"
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// Invert is adding rules for auditdeny; in other cases, invert is removing rules
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#define strip_av(effect, invert) ((effect == AVTAB_AUDITDENY) == !invert)
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#define hash_for_each(node_ptr, n_slot, cur) \
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int i; \
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for (i = 0; i < n_slot; ++i) \
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for (cur = node_ptr[i]; cur; cur = cur->next) \
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#define hashtab_for_each(htab, cur) \
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hash_for_each(htab.htable, htab.size, cur) \
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#define avtab_for_each(avtab, cur) \
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hash_for_each(avtab.htable, avtab.nslot, cur); \
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static bool is_redundant(struct avtab_node* node) {
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switch (node->key.specified) {
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case AVTAB_AUDITDENY:
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return node->datum.u.data == ~0U;
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case AVTAB_XPERMS:
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return node->datum.u.xperms == NULL;
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default:
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return node->datum.u.data == 0U;
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}
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}
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struct avtab_node* get_avtab_node(struct policydb* db, struct avtab_key *key, struct avtab_extended_perms *xperms) {
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struct avtab_node* node;
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/* AVTAB_XPERMS entries are not necessarily unique */
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if (key->specified & AVTAB_XPERMS) {
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bool match = false;
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node = avtab_search_node(&db->te_avtab, key);
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while (node) {
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if ((node->datum.u.xperms->specified == xperms->specified) &&
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(node->datum.u.xperms->driver == xperms->driver)) {
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match = true;
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break;
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}
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node = avtab_search_node_next(node, key->specified);
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}
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if (!match)
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node = NULL;
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} else {
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node = avtab_search_node(&db->te_avtab, key);
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}
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if (!node) {
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struct avtab_datum avdatum = {};
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/*
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* AUDITDENY, aka DONTAUDIT, are &= assigned, versus |= for
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* others. Initialize the data accordingly.
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*/
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avdatum.u.data = key->specified == AVTAB_AUDITDENY ? ~0U : 0U;
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/* this is used to get the node - insertion is actually unique */
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node = avtab_insert_nonunique(&db->te_avtab, key, &avdatum);
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}
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return node;
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}
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bool add_rule(struct policydb* db, const char *s, const char *t, const char *c, const char *p, int effect, bool invert) {
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struct type_datum *src = NULL, *tgt = NULL;
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struct class_datum *cls = NULL;
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struct perm_datum *perm = NULL;
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if (s) {
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src = symtab_search(&db->p_types, s);
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if (src == NULL) {
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pr_info("source type %s does not exist\n", s);
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return false;
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}
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}
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if (t) {
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tgt = symtab_search(&db->p_types, t);
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if (tgt == NULL) {
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pr_info("target type %s does not exist\n", t);
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return false;
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}
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}
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if (c) {
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cls = symtab_search(&db->p_classes, c);
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if (cls == NULL) {
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pr_info("class %s does not exist\n", c);
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return false;
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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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pr_info("No class is specified, cannot add perm [%s] \n", p);
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return false;
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}
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perm = symtab_search(&cls->permissions, p);
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if (perm == NULL && cls->comdatum != NULL) {
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perm = symtab_search(&cls->comdatum->permissions, p);
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}
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if (perm == NULL) {
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pr_info("perm %s does not exist in class %s\n", p, c);
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return false;
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}
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}
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add_rule_raw(db, src, tgt, cls, perm, effect, invert);
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return true;
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}
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void add_rule_raw(struct policydb* db, struct type_datum *src, struct type_datum *tgt, struct class_datum *cls, struct perm_datum *perm, int effect, bool invert) {
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if (src == NULL) {
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struct hashtab_node* node;
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if (strip_av(effect, invert)) {
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hashtab_for_each(db->p_types.table, node) {
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add_rule_raw(db, (struct type_datum*)node->datum, tgt, cls, perm, effect, invert);
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};
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} else {
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hashtab_for_each(db->p_types.table, node) {
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struct type_datum* type = (struct type_datum*)(node->datum);
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if (type->attribute) {
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add_rule_raw(db, type, tgt, cls, perm, effect, invert);
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}
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};
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}
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} else if (tgt == NULL) {
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struct hashtab_node* node;
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if (strip_av(effect, invert)) {
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hashtab_for_each(db->p_types.table, node) {
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add_rule_raw(db, src, (struct type_datum*)node->datum, cls, perm, effect, invert);
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};
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} else {
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hashtab_for_each(db->p_types.table, node) {
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struct type_datum* type = (struct type_datum*)(node->datum);
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if (type->attribute) {
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add_rule_raw(db, src, type, cls, perm, effect, invert);
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}
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};
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}
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} else if (cls == NULL) {
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struct hashtab_node* node;
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hashtab_for_each(db->p_classes.table, node) {
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add_rule_raw(db, src, tgt, (struct class_datum*)node->datum, perm, effect, invert);
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}
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} else {
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struct avtab_key key;
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key.source_type = src->value;
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key.target_type = tgt->value;
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key.target_class = cls->value;
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key.specified = effect;
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struct avtab_node* node = get_avtab_node(db, &key, NULL);
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if (invert) {
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if (perm)
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node->datum.u.data &= ~(1U << (perm->value - 1));
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else
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node->datum.u.data = 0U;
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} else {
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if (perm)
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node->datum.u.data |= 1U << (perm->value - 1);
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else
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node->datum.u.data = ~0U;
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}
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}
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}
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void add_xperm_rule_raw(struct type_datum *src, struct type_datum *tgt,
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struct class_datum *cls, uint16_t low, uint16_t high, int effect, bool invert) {
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}
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bool add_xperm_rule(const char *s, const char *t, const char *c, const char *range, int effect, bool invert) {
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return false;
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}
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bool add_type_rule(struct policydb* db, const char *s, const char *t, const char *c, const char *d, int effect) {
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struct type_datum *src, *tgt, *def;
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struct class_datum *cls;
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src = symtab_search(&db->p_types, s);
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if (src == NULL) {
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pr_info("source type %s does not exist\n", s);
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return false;
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}
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tgt = symtab_search(&db->p_types, t);
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if (tgt == NULL) {
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pr_info("target type %s does not exist\n", t);
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return false;
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}
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cls = symtab_search(&db->p_classes, c);
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if (cls == NULL) {
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pr_info("class %s does not exist\n", c);
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return false;
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}
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def = symtab_search(&db->p_types, d);
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if (def == NULL) {
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pr_info("default type %s does not exist\n", d);
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return false;
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}
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struct avtab_key key;
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key.source_type = src->value;
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key.target_type = tgt->value;
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key.target_class = cls->value;
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key.specified = effect;
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struct avtab_node* node = get_avtab_node(db, &key, NULL);
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node->datum.u.data = def->value;
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return true;
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}
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bool add_filename_trans(const char *s, const char *t, const char *c, const char *d, const char *o) {
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return false;
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}
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bool add_genfscon(const char *fs_name, const char *path, const char *context) {
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return false;
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}
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bool add_type(struct policydb* db, const char *type_name, bool attr) {
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return false;
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}
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bool set_type_state(struct policydb* db, const char *type_name, bool permissive) {
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struct type_datum *type;
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if (type_name == NULL) {
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struct hashtab_node* node;
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hashtab_for_each(db->p_types.table, node) {
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type = (struct type_datum *)(node->datum);
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if (ebitmap_set_bit(&db->permissive_map, type->value, permissive))
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pr_info("Could not set bit in permissive map\n");
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};
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} else {
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type = (struct type_datum *) symtab_search(&db->p_types, type_name);
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if (type == NULL) {
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pr_info("type %s does not exist\n", type_name);
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return false;
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}
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if (ebitmap_set_bit(&db->permissive_map, type->value, permissive)) {
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pr_info("Could not set bit in permissive map\n");
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return false;
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}
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}
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return true;
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}
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void add_typeattribute_raw(struct policydb* db, struct type_datum *type, struct type_datum *attr) {
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ebitmap_set_bit(&db->type_attr_map_array[type->value - 1], attr->value - 1, 1);
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struct hashtab_node* node;
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struct constraint_node* n;
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struct constraint_expr* e;
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hashtab_for_each(db->p_classes.table, node) {
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struct class_datum* cls = (struct class_datum*)(node->datum);
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for (n = cls->constraints; n ; n = n->next) {
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for (e = n->expr; e; e = e->next) {
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if (e->expr_type == CEXPR_NAMES &&
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ebitmap_get_bit(&e->type_names->types, attr->value - 1)) {
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ebitmap_set_bit(&e->names, type->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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bool add_typeattribute(struct policydb* db, const char *type, const char *attr) {
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struct type_datum *type_d = symtab_search(&db->p_types, type);
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if (type_d == NULL) {
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pr_info("type %s does not exist\n", type);
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return false;
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} else if (type_d->attribute) {
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pr_info("type %s is an attribute\n", attr);
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return false;
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}
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struct type_datum *attr_d = symtab_search(&db->p_types, attr);
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if (attr_d == NULL) {
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pr_info("attribute %s does not exist\n", type);
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return false;
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} else if (!attr_d->attribute) {
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pr_info("type %s is not an attribute \n", attr);
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return false;
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}
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add_typeattribute_raw(db, type_d, attr_d);
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return true;
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}
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// Operation on types
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bool type(struct policydb* db, const char* name, const char* attr) {
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return add_type(db, name, false) && add_typeattribute(db, name, attr);
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}
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bool attribute(struct policydb* db, const char* name) {
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return add_type(db, name, true);
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}
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bool permissive(struct policydb* db, const char* type) {
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return set_type_state(db, type, true);
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}
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bool enforce(struct policydb* db, const char* type) {
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return set_type_state(db, type, false);
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}
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bool typeattribute(struct policydb* db, const char* type, const char* attr) {
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return add_typeattribute(db, type, attr);
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}
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bool exists(struct policydb* db, const char* type) {
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return symtab_search(&db->p_types, type) != NULL;
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}
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// Access vector rules
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bool allow(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* perm) {
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return add_rule(db, src, tgt, cls, perm, AVTAB_ALLOWED, false);
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}
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bool deny(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* perm) {
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return add_rule(db, src, tgt, cls, perm, AVTAB_ALLOWED, true);
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}
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bool auditallow(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* perm) {
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return add_rule(db, src, tgt, cls, perm, AVTAB_AUDITALLOW, false);
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}
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bool dontaudit(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* perm) {
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return add_rule(db, src, tgt, cls, perm, AVTAB_AUDITDENY, true);
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}
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// Extended permissions access vector rules
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bool allowxperm(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* range) {
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return add_xperm_rule(src, tgt, cls, range, AVTAB_XPERMS_ALLOWED, false);
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}
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bool auditallowxperm(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* range) {
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return add_xperm_rule(src, tgt, cls, range, AVTAB_XPERMS_AUDITALLOW, false);
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}
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bool dontauditxperm(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* range) {
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return add_xperm_rule(src, tgt, cls, range, AVTAB_XPERMS_DONTAUDIT, false);
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}
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// Type rules
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bool type_transition(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* def, const char* obj) {
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return false;
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}
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bool type_change(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* def) {
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return false;
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}
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bool type_member(struct policydb* db, const char* src, const char* tgt, const char* cls, const char* def) {
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return false;
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}
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// File system labeling
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bool genfscon(struct policydb* db, const char* fs_name, const char* path, const char* ctx) {
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return false;
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}
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