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>
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
new file mode 100644
index 0000000..96502b2
--- /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;
+}