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-rw-r--r--libapol/src/range_trans-query.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/libapol/src/range_trans-query.c b/libapol/src/range_trans-query.c
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+++ b/libapol/src/range_trans-query.c
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+/**
+ * @file
+ *
+ * Provides a way for setools to make queries about range transition
+ * rules within a policy. The caller obtains a query object, fills in
+ * its parameters, and then runs the query; it obtains a vector of
+ * results. Searches are conjunctive -- all fields of the search
+ * query must match for a datum to be added to the results query.
+ *
+ * @author Jeremy A. Mowery jmowery@tresys.com
+ * @author Jason Tang jtang@tresys.com
+ *
+ * Copyright (C) 2006-2007 Tresys Technology, LLC
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "policy-query-internal.h"
+
+#include <errno.h>
+
+struct apol_range_trans_query
+{
+ char *source, *target;
+ apol_vector_t *classes;
+ apol_mls_range_t *range;
+ unsigned int flags;
+};
+
+int apol_range_trans_get_by_query(const apol_policy_t * p, const apol_range_trans_query_t * r, apol_vector_t ** v)
+{
+ qpol_iterator_t *iter = NULL;
+ apol_vector_t *source_list = NULL, *target_list = NULL, *class_list = NULL;
+ apol_mls_range_t *range = NULL;
+ int retval = -1, source_as_any = 0;
+ *v = NULL;
+
+ if (r != NULL) {
+ if (r->source != NULL &&
+ (source_list =
+ apol_query_create_candidate_type_list(p, r->source, r->flags & APOL_QUERY_REGEX,
+ r->flags & APOL_QUERY_SOURCE_INDIRECT,
+ APOL_QUERY_SYMBOL_IS_BOTH)) == NULL) {
+ goto cleanup;
+ }
+ if ((r->flags & APOL_QUERY_SOURCE_AS_ANY) && r->source != NULL) {
+ target_list = source_list;
+ source_as_any = 1;
+ } else if (r->target != NULL &&
+ (target_list =
+ apol_query_create_candidate_type_list(p, r->target, r->flags & APOL_QUERY_REGEX,
+ r->flags & APOL_QUERY_TARGET_INDIRECT,
+ APOL_QUERY_SYMBOL_IS_BOTH)) == NULL) {
+ goto cleanup;
+ }
+ if (r->classes != NULL &&
+ apol_vector_get_size(r->classes) > 0 &&
+ (class_list = apol_query_create_candidate_class_list(p, r->classes)) == NULL) {
+ goto cleanup;
+ }
+ }
+
+ if ((*v = apol_vector_create(NULL)) == NULL) {
+ ERR(p, "%s", strerror(errno));
+ goto cleanup;
+ }
+ if (qpol_policy_get_range_trans_iter(p->p, &iter) < 0) {
+ goto cleanup;
+ }
+ for (; !qpol_iterator_end(iter); qpol_iterator_next(iter)) {
+ qpol_range_trans_t *rule;
+ const qpol_mls_range_t *mls_range;
+ int match_source = 0, match_target = 0, compval;
+ size_t i;
+ if (qpol_iterator_get_item(iter, (void **)&rule) < 0) {
+ goto cleanup;
+ }
+ if (source_list == NULL) {
+ match_source = 1;
+ } else {
+ const qpol_type_t *source_type;
+ if (qpol_range_trans_get_source_type(p->p, rule, &source_type) < 0) {
+ goto cleanup;
+ }
+ if (apol_vector_get_index(source_list, source_type, NULL, NULL, &i) == 0) {
+ match_source = 1;
+ }
+ }
+
+ /* if source did not match, but treating source symbol
+ * as any field, then delay rejecting this rule until
+ * the target has been checked */
+ if (!source_as_any && !match_source) {
+ continue;
+ }
+
+ if (target_list == NULL || (source_as_any && match_source)) {
+ match_target = 1;
+ } else {
+ const qpol_type_t *target_type;
+ if (qpol_range_trans_get_target_type(p->p, rule, &target_type) < 0) {
+ goto cleanup;
+ }
+ if (apol_vector_get_index(target_list, target_type, NULL, NULL, &i) == 0) {
+ match_target = 1;
+ }
+ }
+
+ if (!match_target) {
+ continue;
+ }
+
+ if (class_list != NULL) {
+ const qpol_class_t *obj_class;
+ if (qpol_range_trans_get_target_class(p->p, rule, &obj_class) < 0) {
+ goto cleanup;
+ }
+ if (apol_vector_get_index(class_list, obj_class, NULL, NULL, &i) < 0) {
+ continue;
+ }
+ }
+
+ if (qpol_range_trans_get_range(p->p, rule, &mls_range) < 0 ||
+ (range = apol_mls_range_create_from_qpol_mls_range(p, mls_range)) == NULL) {
+ goto cleanup;
+ }
+ if (r)
+ compval = apol_mls_range_compare(p, range, r->range, r->flags);
+ else
+ compval = 1;
+ apol_mls_range_destroy(&range);
+ if (compval < 0) {
+ goto cleanup;
+ } else if (compval == 0) {
+ continue;
+ }
+
+ if (apol_vector_append(*v, rule)) {
+ ERR(p, "%s", strerror(ENOMEM));
+ goto cleanup;
+ }
+ }
+
+ retval = 0;
+ cleanup:
+ if (retval != 0) {
+ apol_vector_destroy(v);
+ }
+ apol_vector_destroy(&source_list);
+ if (!source_as_any) {
+ apol_vector_destroy(&target_list);
+ }
+ apol_vector_destroy(&class_list);
+ qpol_iterator_destroy(&iter);
+ apol_mls_range_destroy(&range);
+ return retval;
+}
+
+apol_range_trans_query_t *apol_range_trans_query_create(void)
+{
+ return calloc(1, sizeof(apol_range_trans_query_t));
+}
+
+void apol_range_trans_query_destroy(apol_range_trans_query_t ** r)
+{
+ if (*r != NULL) {
+ free((*r)->source);
+ free((*r)->target);
+ apol_vector_destroy(&(*r)->classes);
+ apol_mls_range_destroy(&((*r)->range));
+ free(*r);
+ *r = NULL;
+ }
+}
+
+int apol_range_trans_query_set_source(const apol_policy_t * p, apol_range_trans_query_t * r, const char *symbol, int is_indirect)
+{
+ apol_query_set_flag(p, &r->flags, is_indirect, APOL_QUERY_SOURCE_INDIRECT);
+ return apol_query_set(p, &r->source, NULL, symbol);
+}
+
+int apol_range_trans_query_set_target(const apol_policy_t * p, apol_range_trans_query_t * r, const char *symbol, int is_indirect)
+{
+ apol_query_set_flag(p, &r->flags, is_indirect, APOL_QUERY_TARGET_INDIRECT);
+ return apol_query_set(p, &r->target, NULL, symbol);
+}
+
+int apol_range_trans_query_append_class(const apol_policy_t * p, apol_range_trans_query_t * r, const char *obj_class)
+{
+ char *s = NULL;
+ if (obj_class == NULL) {
+ apol_vector_destroy(&r->classes);
+ } else if ((s = strdup(obj_class)) == NULL || (r->classes == NULL && (r->classes = apol_vector_create(free)) == NULL)
+ || apol_vector_append(r->classes, s) < 0) {
+ ERR(p, "%s", strerror(errno));
+ free(s);
+ return -1;
+ }
+ return 0;
+}
+
+int apol_range_trans_query_set_range(const apol_policy_t * p __attribute__ ((unused)),
+ apol_range_trans_query_t * r, apol_mls_range_t * range, unsigned int range_match)
+{
+ if (r->range != NULL) {
+ apol_mls_range_destroy(&r->range);
+ }
+ r->range = range;
+ r->flags = (r->flags & ~APOL_QUERY_FLAGS) | range_match;
+ return 0;
+}
+
+int apol_range_trans_query_set_source_any(const apol_policy_t * p, apol_range_trans_query_t * r, int is_any)
+{
+ return apol_query_set_flag(p, &r->flags, is_any, APOL_QUERY_SOURCE_AS_ANY);
+}
+
+int apol_range_trans_query_set_regex(const apol_policy_t * p, apol_range_trans_query_t * r, int is_regex)
+{
+ return apol_query_set_regex(p, &r->flags, is_regex);
+}
+
+char *apol_range_trans_render(const apol_policy_t * policy, const qpol_range_trans_t * rule)
+{
+ char *tmp = NULL;
+ const char *tmp_name = NULL;
+ int error = 0;
+ size_t tmp_sz = 0;
+ const qpol_type_t *type = NULL;
+ const qpol_class_t *target_class = NULL;
+ const qpol_mls_range_t *range = NULL;
+ apol_mls_range_t *arange = NULL;
+
+ if (!policy || !rule) {
+ ERR(policy, "%s", strerror(EINVAL));
+ errno = EINVAL;
+ return NULL;
+ }
+
+ /* range_transition */
+ if (apol_str_append(&tmp, &tmp_sz, "range_transition ")) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ return NULL;
+ }
+
+ /* source type */
+ if (qpol_range_trans_get_source_type(policy->p, rule, &type) ||
+ qpol_type_get_name(policy->p, type, &tmp_name) ||
+ apol_str_append(&tmp, &tmp_sz, tmp_name) || apol_str_append(&tmp, &tmp_sz, " ")) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+
+ /* target type */
+ if (qpol_range_trans_get_target_type(policy->p, rule, &type) ||
+ qpol_type_get_name(policy->p, type, &tmp_name) ||
+ apol_str_append(&tmp, &tmp_sz, tmp_name) || apol_str_append(&tmp, &tmp_sz, " : ")) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+
+ /* target class */
+ if (qpol_range_trans_get_target_class(policy->p, rule, &target_class) ||
+ qpol_class_get_name(policy->p, target_class, &tmp_name) ||
+ apol_str_append(&tmp, &tmp_sz, tmp_name) || apol_str_append(&tmp, &tmp_sz, " ")) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+
+ /* range */
+ if (qpol_range_trans_get_range(policy->p, rule, &range)) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+ if (!(arange = apol_mls_range_create_from_qpol_mls_range(policy, range))) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+ char *tmp_range_str = NULL;
+ if (!(tmp_range_str = apol_mls_range_render(policy, arange))) {
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+ apol_mls_range_destroy(&arange);
+ if (apol_str_append(&tmp, &tmp_sz, tmp_range_str) || apol_str_append(&tmp, &tmp_sz, ";")) {
+ free(tmp_range_str);
+ error = errno;
+ ERR(policy, "%s", strerror(error));
+ goto err;
+ }
+ free(tmp_range_str);
+ return tmp;
+
+ err:
+ apol_mls_range_destroy(&arange);
+ free(tmp);
+ errno = error;
+ return NULL;
+}