linux-kernel - [PATCH 5/8] CaitSith: Add LSM adapter functions.

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Date:   Fri, 21 Oct 2016 21:49:07 +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 5/8] CaitSith: Add LSM adapter functions.

This version implements only execve() related LSM hooks.

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---
 security/caitsith/lsm.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 security/caitsith/lsm.c

diff --git a/security/caitsith/lsm.c b/security/caitsith/lsm.c
new file mode 100644
index 0000000..675cee8
--- /dev/null
+++ b/security/caitsith/lsm.c
@@ -0,0 +1,60 @@
+/*
+ * security/caitsith/lsm.c
+ *
+ * Copyright (C) 2010-2013  Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
+ */
+
+#include <linux/lsm_hooks.h>
+#include "caitsith.h"
+
+/**
+ * caitsith_bprm_set_creds - Target for security_bprm_set_creds().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int caitsith_bprm_set_creds(struct linux_binprm *bprm)
+{
+	/*
+	 * Do only if this function is called for the first time of an execve
+	 * operation.
+	 */
+	if (bprm->cred_prepared)
+		return 0;
+#ifndef CONFIG_SECURITY_CAITSITH_OMIT_USERSPACE_LOADER
+	/*
+	 * Load policy if /sbin/caitsith-init exists and /sbin/init is requested
+	 * for the first time.
+	 */
+	if (!cs_policy_loaded)
+		cs_load_policy(bprm->filename);
+#endif
+	return cs_start_execve(bprm);
+}
+
+/*
+ * caitsith_security_ops is a "struct security_operations" which is used for
+ * registering CaitSith.
+ */
+static struct security_hook_list caitsith_hooks[] = {
+	LSM_HOOK_INIT(bprm_set_creds, caitsith_bprm_set_creds),
+};
+
+/**
+ * caitsith_init - Register CaitSith as a LSM module.
+ *
+ * Returns 0.
+ */
+static int __init caitsith_init(void)
+{
+	if (!security_module_enable("caitsith"))
+		return 0;
+	/* register ourselves with the security framework */
+	security_add_hooks(caitsith_hooks, ARRAY_SIZE(caitsith_hooks));
+	printk(KERN_INFO "CaitSith initialized\n");
+	cs_init_module();
+	return 0;
+}
+
+security_initcall(caitsith_init);
-- 
1.8.3.1