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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /security/tomoyo/load_policy.c
Initial import
Diffstat (limited to 'security/tomoyo/load_policy.c')
-rw-r--r--security/tomoyo/load_policy.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c
new file mode 100644
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+++ b/security/tomoyo/load_policy.c
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+/*
+ * security/tomoyo/load_policy.c
+ *
+ * Copyright (C) 2005-2011 NTT DATA CORPORATION
+ */
+
+#include "common.h"
+
+#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+
+/*
+ * Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
+ */
+static const char *tomoyo_loader;
+
+/**
+ * tomoyo_loader_setup - Set policy loader.
+ *
+ * @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_loader_setup(char *str)
+{
+ tomoyo_loader = str;
+ return 0;
+}
+
+__setup("TOMOYO_loader=", tomoyo_loader_setup);
+
+/**
+ * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
+ *
+ * Returns true if /sbin/tomoyo-init exists, false otherwise.
+ */
+static bool tomoyo_policy_loader_exists(void)
+{
+ struct path path;
+ if (!tomoyo_loader)
+ tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
+ if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
+ printk(KERN_INFO "Not activating Mandatory Access Control "
+ "as %s does not exist.\n", tomoyo_loader);
+ return false;
+ }
+ path_put(&path);
+ return true;
+}
+
+/*
+ * Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
+ */
+static const char *tomoyo_trigger;
+
+/**
+ * tomoyo_trigger_setup - Set trigger for activation.
+ *
+ * @str: Program to use as an activation trigger (e.g. /sbin/init ).
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_trigger_setup(char *str)
+{
+ tomoyo_trigger = str;
+ return 0;
+}
+
+__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
+
+/**
+ * tomoyo_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * This function checks whether @filename is /sbin/init , and if so
+ * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
+ * and then continues invocation of /sbin/init.
+ * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
+ * writes to /sys/kernel/security/tomoyo/ interfaces.
+ *
+ * Returns nothing.
+ */
+void tomoyo_load_policy(const char *filename)
+{
+ static bool done;
+ char *argv[2];
+ char *envp[3];
+
+ if (tomoyo_policy_loaded || done)
+ return;
+ if (!tomoyo_trigger)
+ tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
+ if (strcmp(filename, tomoyo_trigger))
+ return;
+ if (!tomoyo_policy_loader_exists())
+ return;
+ done = true;
+ printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
+ tomoyo_loader);
+ argv[0] = (char *) tomoyo_loader;
+ argv[1] = NULL;
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[2] = NULL;
+ call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+ tomoyo_check_profile();
+}
+
+#endif