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Date: Fri, 21 Oct 2016 21:49:08 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: linux-security-module@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: [PATCH 6/8] CaitSith: Add policy loader functions.
This file allows userspace tools to load policy configuration
unless CONFIG_SECURITY_CAITSITH_OMIT_USERSPACE_LOADER is defined.
If CONFIG_SECURITY_CAITSITH_OMIT_USERSPACE_LOADER is defined,
only built-in policy configuration which is generated as
security/caitsith/builtin-policy.h at compilation time from
security/caitsith/policy/policy.conf will be loaded.
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
security/caitsith/load_policy.c | 106 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 106 insertions(+)
create mode 100644 security/caitsith/load_policy.c
diff --git a/security/caitsith/load_policy.c b/security/caitsith/load_policy.c
new file mode 100644
index 0000000..e9b9706
--- /dev/null
+++ b/security/caitsith/load_policy.c
@@ -0,0 +1,106 @@
+/*
+ * security/caitsith/load_policy.c
+ *
+ * Copyright (C) 2005-2012 NTT DATA CORPORATION
+ */
+
+#include "caitsith.h"
+
+#ifndef CONFIG_SECURITY_CAITSITH_OMIT_USERSPACE_LOADER
+
+/* Path to the policy loader. */
+static const char *cs_loader;
+
+/**
+ * cs_loader_setup - Set policy loader.
+ *
+ * @str: Program to use as a policy loader (e.g. /sbin/caitsith-init ).
+ *
+ * Returns 0.
+ */
+static int __init cs_loader_setup(char *str)
+{
+ cs_loader = str;
+ return 0;
+}
+
+__setup("CS_loader=", cs_loader_setup);
+
+/**
+ * cs_policy_loader_exists - Check whether /sbin/caitsith-init exists.
+ *
+ * Returns true if /sbin/caitsith-init exists, false otherwise.
+ */
+static bool cs_policy_loader_exists(void)
+{
+ struct path path;
+
+ if (!cs_loader)
+ cs_loader = CONFIG_SECURITY_CAITSITH_POLICY_LOADER;
+ if (kern_path(cs_loader, LOOKUP_FOLLOW, &path) == 0) {
+ path_put(&path);
+ return true;
+ }
+ printk(KERN_INFO "Not activating CaitSith as %s does not exist.\n",
+ cs_loader);
+ return false;
+}
+
+/* Path to the trigger. */
+static const char *cs_trigger;
+
+/**
+ * cs_trigger_setup - Set trigger for activation.
+ *
+ * @str: Program to use as an activation trigger (e.g. /sbin/init ).
+ *
+ * Returns 0.
+ */
+static int __init cs_trigger_setup(char *str)
+{
+ cs_trigger = str;
+ return 0;
+}
+
+__setup("CS_trigger=", cs_trigger_setup);
+
+/**
+ * cs_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * Returns nothing.
+ *
+ * This function checks whether @filename is /sbin/init, and if so
+ * invoke /sbin/caitsith-init and wait for the termination of
+ * /sbin/caitsith-init and then continues invocation of /sbin/init.
+ * /sbin/caitsith-init reads policy files in /etc/caitsith/ directory and
+ * writes to /sys/kernel/security/caitsith/ interfaces.
+ */
+void cs_load_policy(const char *filename)
+{
+ static _Bool done;
+ char *argv[2];
+ char *envp[3];
+
+ if (done)
+ return;
+ if (!cs_trigger)
+ cs_trigger = CONFIG_SECURITY_CAITSITH_ACTIVATION_TRIGGER;
+ if (strcmp(filename, cs_trigger))
+ return;
+ if (!cs_policy_loader_exists())
+ return;
+ done = 1;
+ printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
+ cs_loader);
+ argv[0] = (char *) cs_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);
+ cs_check_profile();
+}
+
+#endif
--
1.8.3.1
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