AppArmor: basic auditing infrastructure.

Update lsm_audit for AppArmor specific data, and add the core routines for
AppArmor uses for auditing.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
new file mode 100644
index 000000000000..96502b22b268
--- /dev/null
+++ b/security/apparmor/audit.c
@@ -0,0 +1,215 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor auditing functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/audit.h>
+#include <linux/socket.h>
+
+#include "include/apparmor.h"
+#include "include/audit.h"
+#include "include/policy.h"
+
+const char *op_table[] = {
+	"null",
+
+	"sysctl",
+	"capable",
+
+	"unlink",
+	"mkdir",
+	"rmdir",
+	"mknod",
+	"truncate",
+	"link",
+	"symlink",
+	"rename_src",
+	"rename_dest",
+	"chmod",
+	"chown",
+	"getattr",
+	"open",
+
+	"file_perm",
+	"file_lock",
+	"file_mmap",
+	"file_mprotect",
+
+	"create",
+	"post_create",
+	"bind",
+	"connect",
+	"listen",
+	"accept",
+	"sendmsg",
+	"recvmsg",
+	"getsockname",
+	"getpeername",
+	"getsockopt",
+	"setsockopt",
+	"socket_shutdown",
+
+	"ptrace",
+
+	"exec",
+	"change_hat",
+	"change_profile",
+	"change_onexec",
+
+	"setprocattr",
+	"setrlimit",
+
+	"profile_replace",
+	"profile_load",
+	"profile_remove"
+};
+
+const char *audit_mode_names[] = {
+	"normal",
+	"quiet_denied",
+	"quiet",
+	"noquiet",
+	"all"
+};
+
+static char *aa_audit_type[] = {
+	"AUDIT",
+	"ALLOWED",
+	"DENIED",
+	"HINT",
+	"STATUS",
+	"ERROR",
+	"KILLED"
+};
+
+/*
+ * Currently AppArmor auditing is fed straight into the audit framework.
+ *
+ * TODO:
+ * netlink interface for complain mode
+ * user auditing, - send user auditing to netlink interface
+ * system control of whether user audit messages go to system log
+ */
+
+/**
+ * audit_base - core AppArmor function.
+ * @ab: audit buffer to fill (NOT NULL)
+ * @ca: audit structure containing data to audit (NOT NULL)
+ *
+ * Record common AppArmor audit data from @sa
+ */
+static void audit_pre(struct audit_buffer *ab, void *ca)
+{
+	struct common_audit_data *sa = ca;
+	struct task_struct *tsk = sa->tsk ? sa->tsk : current;
+
+	if (aa_g_audit_header) {
+		audit_log_format(ab, "apparmor=");
+		audit_log_string(ab, aa_audit_type[sa->aad.type]);
+	}
+
+	if (sa->aad.op) {
+		audit_log_format(ab, " operation=");
+		audit_log_string(ab, op_table[sa->aad.op]);
+	}
+
+	if (sa->aad.info) {
+		audit_log_format(ab, " info=");
+		audit_log_string(ab, sa->aad.info);
+		if (sa->aad.error)
+			audit_log_format(ab, " error=%d", sa->aad.error);
+	}
+
+	if (sa->aad.profile) {
+		struct aa_profile *profile = sa->aad.profile;
+		pid_t pid;
+		rcu_read_lock();
+		pid = tsk->real_parent->pid;
+		rcu_read_unlock();
+		audit_log_format(ab, " parent=%d", pid);
+		if (profile->ns != root_ns) {
+			audit_log_format(ab, " namespace=");
+			audit_log_untrustedstring(ab, profile->ns->base.hname);
+		}
+		audit_log_format(ab, " profile=");
+		audit_log_untrustedstring(ab, profile->base.hname);
+	}
+
+	if (sa->aad.name) {
+		audit_log_format(ab, " name=");
+		audit_log_untrustedstring(ab, sa->aad.name);
+	}
+}
+
+/**
+ * aa_audit_msg - Log a message to the audit subsystem
+ * @sa: audit event structure (NOT NULL)
+ * @cb: optional callback fn for type specific fields (MAYBE NULL)
+ */
+void aa_audit_msg(int type, struct common_audit_data *sa,
+		  void (*cb) (struct audit_buffer *, void *))
+{
+	sa->aad.type = type;
+	sa->lsm_pre_audit = audit_pre;
+	sa->lsm_post_audit = cb;
+	common_lsm_audit(sa);
+}
+
+/**
+ * aa_audit - Log a profile based audit event to the audit subsystem
+ * @type: audit type for the message
+ * @profile: profile to check against (NOT NULL)
+ * @gfp: allocation flags to use
+ * @sa: audit event (NOT NULL)
+ * @cb: optional callback fn for type specific fields (MAYBE NULL)
+ *
+ * Handle default message switching based off of audit mode flags
+ *
+ * Returns: error on failure
+ */
+int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
+	     struct common_audit_data *sa,
+	     void (*cb) (struct audit_buffer *, void *))
+{
+	BUG_ON(!profile);
+
+	if (type == AUDIT_APPARMOR_AUTO) {
+		if (likely(!sa->aad.error)) {
+			if (AUDIT_MODE(profile) != AUDIT_ALL)
+				return 0;
+			type = AUDIT_APPARMOR_AUDIT;
+		} else if (COMPLAIN_MODE(profile))
+			type = AUDIT_APPARMOR_ALLOWED;
+		else
+			type = AUDIT_APPARMOR_DENIED;
+	}
+	if (AUDIT_MODE(profile) == AUDIT_QUIET ||
+	    (type == AUDIT_APPARMOR_DENIED &&
+	     AUDIT_MODE(profile) == AUDIT_QUIET))
+		return sa->aad.error;
+
+	if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
+		type = AUDIT_APPARMOR_KILL;
+
+	if (!unconfined(profile))
+		sa->aad.profile = profile;
+
+	aa_audit_msg(type, sa, cb);
+
+	if (sa->aad.type == AUDIT_APPARMOR_KILL)
+		(void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
+
+	if (sa->aad.type == AUDIT_APPARMOR_ALLOWED)
+		return complain_error(sa->aad.error);
+
+	return sa->aad.error;
+}