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+/**
+ * @file
+ *
+ * Routines to query access vector rules of a policy. These are
+ * allow, neverallow, auditallow, and dontaudit rules.
+ *
+ * @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
+ */
+
+#ifndef APOL_AVRULE_QUERY_H
+#define APOL_AVRULE_QUERY_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "policy.h"
+#include "vector.h"
+#include <qpol/policy.h>
+
+ typedef struct apol_avrule_query apol_avrule_query_t;
+
+/**
+ * Execute a query against all access vector rules within the policy.
+ *
+ * @param p Policy within which to look up avrules.
+ * @param a Structure containing parameters for query. If this is
+ * NULL then return all avrules.
+ * @param v Reference to a vector of qpol_avrule_t. The vector will
+ * be allocated by this function. The caller must call
+ * apol_vector_destroy() afterwards. This will be set to NULL upon no
+ * results or upon error.
+ *
+ * @return 0 on success (including none found), negative on error.
+ */
+ extern int apol_avrule_get_by_query(const apol_policy_t * p, const apol_avrule_query_t * a, apol_vector_t ** v);
+
+/**
+ * Execute a query against all syntactic access vector rules within
+ * the policy. If the policy has line numbers, then the returned list
+ *
+ * @param p Policy within which to look up avrules. The policy must
+ * be capable of having syntactic rules.
+ * @param a Structure containing parameters for query. If this is
+ * NULL then return all avrules.
+ * @param v Reference to a vector of qpol_syn_avrule_t. The vector
+ * will be allocated by this function. The caller must call
+ * apol_vector_destroy() afterwards. This will be set to NULL upon no
+ * results or upon error.
+ *
+ * @return 0 on success (including none found), negative on error.
+ */
+ extern int apol_syn_avrule_get_by_query(const apol_policy_t * p, const apol_avrule_query_t * a, apol_vector_t ** v);
+
+/**
+ * Allocate and return a new avrule query structure. All fields are
+ * initialized, such that running this blank query results in
+ * returning all avrules within the policy. The caller must call
+ * apol_avrule_query_destroy() upon the return value afterwards.
+ *
+ * @return An initialized avrule query structure, or NULL upon error.
+ */
+ extern apol_avrule_query_t *apol_avrule_query_create(void);
+
+/**
+ * Deallocate all memory associated with the referenced avrule query,
+ * and then set it to NULL. This function does nothing if the query
+ * is already NULL.
+ *
+ * @param a Reference to a avrule query structure to destroy.
+ */
+ extern void apol_avrule_query_destroy(apol_avrule_query_t ** a);
+
+/**
+ * Set an avrule query to search only certain access vector rules
+ * within the policy. This is a bitmap; use the constants in
+ * libqpol/avrule_query.h (QPOL_RULE_ALLOW, etc.) to give the rule
+ * selections.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param rules Bitmap to indicate which rules to search, or 0 to
+ * search all rules.
+ *
+ * @return Always 0.
+ */
+ extern int apol_avrule_query_set_rules(const apol_policy_t * p, apol_avrule_query_t * a, unsigned int rules);
+
+/**
+ * Set an avrule query to return rules whose source symbol matches
+ * symbol. Symbol may be a type or attribute; if it is an alias then
+ * the query will convert it to its primary prior to searching. If
+ * is_indirect is non-zero then the search will be done indirectly.
+ * If the symbol is a type, then the query matches rules with one of
+ * the type's attributes. If the symbol is an attribute, then it
+ * matches rule with any of the attribute's types.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param symbol Limit query to rules with this symbol as their
+ * source, or NULL to unset this field.
+ * @param is_indirect If non-zero, perform indirect matching.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_set_source(const apol_policy_t * p, apol_avrule_query_t * a, const char *symbol,
+ int is_indirect);
+
+/**
+ * Set an avrule query to return rules whose source symbol is matched as a type
+ * or an attribute. The symbol will match both types and attributes by default.
+ * @see apol_avrule_query_set_source() to set the symbol to match.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param component Bit-wise or'ed set of APOL_QUERY_SYMBOL_IS_TYPE
+ * and APOL_QUERY_SYMBOL_IS_ATTRIBUTE indicating the type of component
+ * to match.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_set_source_component(const apol_policy_t * p, apol_avrule_query_t * a, unsigned int component);
+
+/**
+ * Set an avrule query to return rules whose target symbol matches
+ * symbol. Symbol may be a type or attribute; if it is an alias then
+ * the query will convert it to its primary prior to searching. If
+ * is_indirect is non-zero then the search will be done indirectly.
+ * If the symbol is a type, then the query matches rules with one of
+ * the type's attributes. If the symbol is an attribute, then it
+ * matches rule with any of the attribute's types.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param symbol Limit query to rules with this symbol as their
+ * target, or NULL to unset this field.
+ * @param is_indirect If non-zero, perform indirect matching.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_set_target(const apol_policy_t * p, apol_avrule_query_t * a, const char *symbol,
+ int is_indirect);
+
+/**
+ * Set an avrule query to return rules whose target symbol is matched as a type
+ * or an attribute. The symbol will match both types and attributes by default.
+ * @see apol_avrule_query_set_target() to set the symbol to match.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param component Bit-wise or'ed set of APOL_QUERY_SYMBOL_IS_TYPE
+ * and APOL_QUERY_SYMBOL_IS_ATTRIBUTE indicating the type of component
+ * to match.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_set_target_component(const apol_policy_t * p, apol_avrule_query_t * a, unsigned int component);
+
+/**
+ * Set an avrule query to return rules with this object (non-common)
+ * class. If more than one class are appended to the query, the
+ * rule's class must be one of those appended. (I.e., the rule's
+ * class must be a member of the query's classes.) Pass a NULL to
+ * clear all classes. Note that this performs straight string
+ * comparison, ignoring the regex flag.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param obj_class Name of object class to add to search set, or NULL
+ * to clear all classes.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_append_class(const apol_policy_t * p, apol_avrule_query_t * a, const char *obj_class);
+
+/**
+ * Set an avrule query to return rules with this permission. By
+ * default, if more than one permission are appended to the query, at
+ * least one of the rule's permissions must be one of those appended;
+ * that is, the intersection of query's and rule's permissions must be
+ * non-empty. (This behavior can be changed.) Pass a NULL to clear
+ * all permissions. Note that this performs a straight string
+ * comparison, ignoring the regex flag.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param perm Name of permission to add to search set, or NULL to
+ * clear all permissions.
+ *
+ * @return 0 on success, negative on error.
+ *
+ * @see apol_avrule_query_set_all_perms()
+ */
+ extern int apol_avrule_query_append_perm(const apol_policy_t * p, apol_avrule_query_t * a, const char *perm);
+
+/**
+ * Set an avrule query to return rules that are in conditionals and
+ * whose conditional uses a particular boolean variable.
+ * Unconditional rules will not be returned.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param bool_name Name of boolean that conditional must contain. If
+ * NULL then search all rules.
+ *
+ * @return 0 on success, negative on error.
+ */
+ extern int apol_avrule_query_set_bool(const apol_policy_t * p, apol_avrule_query_t * a, const char *bool_name);
+
+/**
+ * Set an avrule query to search only enabled rules within the policy.
+ * These include rules that are unconditional and those within enabled
+ * conditionals.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param is_enabled Non-zero to search only enabled rules, 0 to
+ * search all rules.
+ *
+ * @return Always 0.
+ */
+ extern int apol_avrule_query_set_enabled(const apol_policy_t * p, apol_avrule_query_t * a, int is_enabled);
+
+/**
+ * Normally, if more than one permission are added to the query then
+ * all returned rules will have <em>at least one</em> of those
+ * permissions. If the all_perms flag is set, then returned rules
+ * will have <em>all</em> of the given permissions. This flag does
+ * nothing if no permissions are given.
+ *
+ * <em>Note:</em> If calling apol_syn_avrule_get_by_query(), the
+ * returned results may not be what is expected. For a given
+ * source-target-class triplet, all of the associated permissions are
+ * unioned together prior to executing the avrule query. Although a
+ * given syntactic AV rule might not have all of the matched
+ * permissions, the union of the rules' permissions will them. For
+ * example, consider these two allow rules:
+ *
+ *<pre>allow A B : C p1;
+ *allow A B : C p2;</pre>
+ *
+ * If the avrule query has both permissions p1 and p2 and the
+ * all_perms flag is set, then both of these syntactic rules will be
+ * returned by apol_syn_avrule_get_by_query().
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param all_perms Non-zero to match all permissions, zero to match
+ * any permission.
+ *
+ * @return Always 0.
+ *
+ * @see apol_avrule_query_append_perm()
+ */
+ extern int apol_avrule_query_set_all_perms(const apol_policy_t * p, apol_avrule_query_t * a, int all_perms);
+
+/**
+ * Set an avrule query to treat the source symbol as any. That is,
+ * use the same symbol for either source or target of a rule. This
+ * flag does nothing if the source symbol is not set.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param is_any Non-zero to use source symbol for any field, 0 to
+ * keep source as only source.
+ *
+ * @return Always 0.
+ */
+ extern int apol_avrule_query_set_source_any(const apol_policy_t * p, apol_avrule_query_t * a, int is_any);
+
+/**
+ * Set an avrule query to use regular expression searching for source
+ * and target types/attributes. Strings will be treated as regexes
+ * instead of literals. Matching will occur against the type name or
+ * any of its aliases.
+ *
+ * @param p Policy handler, to report errors.
+ * @param a AV rule query to set.
+ * @param is_regex Non-zero to enable regex searching, 0 to disable.
+ *
+ * @return Always 0.
+ */
+ extern int apol_avrule_query_set_regex(const apol_policy_t * p, apol_avrule_query_t * a, int is_regex);
+
+/**
+ * Given a single avrule, return a newly allocated vector of
+ * qpol_syn_avrule_t pointers (relative to the given policy) which
+ * comprise that rule. The vector will be sorted by line numbers if
+ * the policy has line numbers. If the given perms vector is non-NULL
+ * and non-empty, then only return syntactic rules with at least one
+ * permission listed within the perms vector.
+ *
+ * @param p Policy from which to obtain syntactic rules.
+ * @param rule AV rule to convert.
+ * @param perms If non-NULL and non-empty, a list of permission
+ * strings. Returned syn avrules will have at least one permission in
+ * common with this list.
+ *
+ * @return A newly allocated vector of syn_avrule_t pointers. The
+ * caller is responsible for calling apol_vector_destroy() afterwards.
+ */
+ extern apol_vector_t *apol_avrule_to_syn_avrules(const apol_policy_t * p, const qpol_avrule_t * rule,
+ const apol_vector_t * perms);
+
+/**
+ * Given a vector of avrules (qpol_avrule_t pointers), return a newly
+ * allocated vector of qpol_syn_avrule_t pointers (relative to the
+ * given policy) which comprise all of those rules. The returned
+ * vector will be sorted by line numbers if the policy has line
+ * numbers. Also, it will not have any duplicate syntactic rules. If
+ * the given perms vector is non-NULL and non-empty, then only return
+ * syntactic rules with at least one permission listed within the
+ * perms vector.
+ *
+ * @param p Policy from which to obtain syntactic rules.
+ * @param rules Vector of AV rules to convert.
+ * @param perms If non-NULL and non-empty, a list of permission
+ * strings. Returned syn avrules will have at least one permission in
+ * common with this list.
+ *
+ * @return A newly allocated vector of syn_avrule_t pointers. The
+ * caller is responsible for calling apol_vector_destroy() afterwards.
+ */
+ extern apol_vector_t *apol_avrule_list_to_syn_avrules(const apol_policy_t * p, const apol_vector_t * rules,
+ const apol_vector_t * perms);
+
+/**
+ * Render an avrule to a string.
+ *
+ * @param policy Policy handler, to report errors.
+ * @param rule The rule to render.
+ *
+ * @return a newly malloc()'d string representation of the rule, or NULL on
+ * failure; if the call fails, errno will be set. The caller is responsible
+ * for calling free() on the returned string.
+ */
+ extern char *apol_avrule_render(const apol_policy_t * policy, const qpol_avrule_t * rule);
+
+/**
+ * Render a syntactic avrule to a string.
+ *
+ * @param policy Policy handler to report errors.
+ * @param rule The rule to render.
+ *
+ * @return a newly malloc()'d string representation of the rule, or NULL on
+ * failure; if the call fails, errno will be set. The caller is responsible
+ * for calling free() on the returned string.
+*/
+ extern char *apol_syn_avrule_render(const apol_policy_t * policy, const qpol_syn_avrule_t * rule);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif