libsemanage: maintain disable dontaudit state between handle commits

Currently any changes made to the policy which require committing a handle cause dontaudit rules to be re-enabled. This is confusing, and frustrating for users who want to edit policy with dontaudit rules turned off. This patch allows semanage to remember the last state of the dontaudit rules and apply them as default whenever a handle is connected. Additionally other functions may check for the file semanage creates to determine if dontaudit rules are turned on. This knowledge can be useful for tools like SETroubleshoot which may want to change their behavior depending on the state of the dontaudit rules. In the event that a the file cannot be created a call to commit will fail.

Signed-off-by: Christopher Pardy <cpardy@redhat.com>

[sds:  Removed duplicate from other patch and cleaned up style.]
[sds:  Changed uses of semanage_fname to semanage_path.]
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

libsemanage/include/semanage/handle.h

@@ -69,6 +69,9 @@ void semanage_set_rebuild(semanage_handle_t * handle, int do_rebuild);
  * 1 for yes, 0 for no (default) */
 void semanage_set_create_store(semanage_handle_t * handle, int create_store);
 
+/*Get whether or not dontaudits will be disabled upon commit */
+int semanage_get_disable_dontaudit(semanage_handle_t * handle);
+
 /* Set whether or not to disable dontaudits upon commit */
 void semanage_set_disable_dontaudit(semanage_handle_t * handle, int disable_dontaudit);
 

libsemanage/src/direct_api.c

@@ -20,6 +20,7 @@
  */
 
 #include <sepol/module.h>
+#include <sepol/handle.h>
 #include <selinux/selinux.h>
 
 #include <assert.h>
@@ -111,6 +112,7 @@ int semanage_direct_is_managed(semanage_handle_t * sh)
 int semanage_direct_connect(semanage_handle_t * sh)
 {
 	char polpath[PATH_MAX];
+	const char *path;
 
 	snprintf(polpath, PATH_MAX, "%s%s", selinux_path(),
 		 sh->conf->store_path);
@@ -223,6 +225,13 @@ int semanage_direct_connect(semanage_handle_t * sh)
 	if (bool_activedb_dbase_init(sh, semanage_bool_dbase_active(sh)) < 0)
 		goto err;
 
+	/* set the disable dontaudit value */
+	path = semanage_path(SEMANAGE_ACTIVE, SEMANAGE_DISABLE_DONTAUDIT);
+	if (access(path, F_OK) == 0)
+		sepol_set_disable_dontaudit(sh->sepolh, 1);
+	else
+		sepol_set_disable_dontaudit(sh->sepolh, 0);
+
 	return STATUS_SUCCESS;
 
       err:
@@ -645,7 +654,7 @@ static int semanage_direct_commit(semanage_handle_t * sh)
 	char **mod_filenames = NULL;
 	char *sorted_fc_buffer = NULL, *sorted_nc_buffer = NULL;
 	size_t sorted_fc_buffer_len = 0, sorted_nc_buffer_len = 0;
-	const char *linked_filename = NULL, *ofilename = NULL;
+	const char *linked_filename = NULL, *ofilename = NULL, *path;
 	sepol_module_package_t *base = NULL;
 	int retval = -1, num_modfiles = 0, i;
 	sepol_policydb_t *out = NULL;
@@ -669,6 +678,27 @@ static int semanage_direct_commit(semanage_handle_t * sh)
 	dbase_config_t *pfcontexts = semanage_fcontext_dbase_policy(sh);
 	dbase_config_t *seusers = semanage_seuser_dbase_local(sh);
 
+	/* Create or remove the disable_dontaudit flag file. */
+	path = semanage_path(SEMANAGE_TMP, SEMANAGE_DISABLE_DONTAUDIT);
+	if (sepol_get_disable_dontaudit(sh->sepolh) == 1) {
+		FILE *touch;
+		touch = fopen(path, "w");
+		if (touch != NULL) {
+			if (fclose(touch) != 0) {
+				ERR(sh, "Error attempting to create disable_dontaudit flag.");
+				goto cleanup;
+			}
+		} else {
+			ERR(sh, "Error attempting to create disable_dontaudit flag.");
+			goto cleanup;
+		}
+	} else {
+		if (remove(path) == -1 && errno != ENOENT) {
+			ERR(sh, "Error removing the disable_dontaudit flag.");
+			goto cleanup;
+		}
+	}
+
 	/* Before we do anything else, flush the join to its component parts.
 	 * This *does not* flush to disk automatically */
 	if (users->dtable->is_modified(users->dbase)) {

libsemanage/src/handle.c

@@ -110,6 +110,13 @@ void semanage_set_create_store(semanage_handle_t * sh, int create_store)
 	return;
 }
 
+int semanage_get_disable_dontaudit(semanage_handle_t * sh)
+{
+	assert(sh != NULL);
+
+	return sepol_get_disable_dontaudit(sh->sepolh);
+}
+
 void semanage_set_disable_dontaudit(semanage_handle_t * sh, int disable_dontaudit)
 {
 	assert(sh != NULL);

libsemanage/src/libsemanage.map

@@ -15,7 +15,7 @@ LIBSEMANAGE_1.0 {
 	  semanage_iface_*; semanage_port_*; semanage_context_*;
 	  semanage_node_*;
 	  semanage_fcontext_*; semanage_access_check; semanage_set_create_store;
-	  semanage_is_connected; semanage_set_disable_dontaudit;
+	  semanage_is_connected; semanage_get_disable_dontaudit; semanage_set_disable_dontaudit;
 	  semanage_mls_enabled;
   local: *;
 };

libsemanage/src/semanage_store.c

@@ -114,6 +114,7 @@ static const char *semanage_sandbox_paths[SEMANAGE_STORE_NUM_PATHS] = {
 	"/users_extra",
 	"/netfilter_contexts",
 	"/file_contexts.homedirs",
+	"/disable_dontaudit",
 };
 
 /* A node used in a linked list of file contexts; used for sorting.

libsemanage/src/semanage_store.h

@@ -58,6 +58,7 @@ enum semanage_sandbox_defs {
 	SEMANAGE_USERS_EXTRA,
 	SEMANAGE_NC,
 	SEMANAGE_FC_HOMEDIRS,
+	SEMANAGE_DISABLE_DONTAUDIT,
 	SEMANAGE_STORE_NUM_PATHS
 };