diff options
Diffstat (limited to 'libapol/src/range_trans-query.c')
-rw-r--r-- | libapol/src/range_trans-query.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/libapol/src/range_trans-query.c b/libapol/src/range_trans-query.c new file mode 100644 index 0000000..6ba80b7 --- /dev/null +++ b/libapol/src/range_trans-query.c @@ -0,0 +1,318 @@ +/** + * @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; +} |