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authorLennart Poettering <lennart@poettering.net>2013-10-10 16:35:44 +0200
committerLennart Poettering <lennart@poettering.net>2013-10-10 16:35:44 +0200
commitd682b3a7e7c7c2941a4d3e193f1e330dbc9fae89 (patch)
treef9e0c1c2af7b0756af89db0864a0708076a55144 /src/shared/apparmor-util.c
parent0581dac2c146cef0f55841a4c136dc48409c8eaa (diff)
security: rework selinux, smack, ima, apparmor detection logic
Always cache the results, and bypass low-level security calls when the respective subsystem is not enabled.
Diffstat (limited to 'src/shared/apparmor-util.c')
-rw-r--r--src/shared/apparmor-util.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/src/shared/apparmor-util.c b/src/shared/apparmor-util.c
new file mode 100644
index 0000000000..2b85da1e4a
--- /dev/null
+++ b/src/shared/apparmor-util.c
@@ -0,0 +1,41 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd 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.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+
+#include "util.h"
+#include "fileio.h"
+#include "apparmor-util.h"
+
+static int use_apparmor_cached = -1;
+
+bool use_apparmor(void) {
+
+ if (use_apparmor_cached < 0) {
+ _cleanup_free_ char *p = NULL;
+
+ use_apparmor_cached =
+ read_one_line_file("/sys/module/apparmor/parameters/enabled", &p) >= 0 &&
+ parse_boolean(p) > 0;
+ }
+
+ return use_apparmor_cached;
+}