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>
This commit is contained in:
John Johansen
James Morris
parent
cdff264264
commit
67012e8209
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@ -98,6 +98,33 @@ struct common_audit_data {
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struct av_decision *avd;
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int result;
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} selinux_audit_data;
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#endif
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#ifdef CONFIG_SECURITY_APPARMOR
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struct {
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int error;
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int op;
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int type;
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void *profile;
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const char *name;
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const char *info;
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union {
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void *target;
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struct {
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long pos;
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void *target;
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} iface;
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struct {
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int rlim;
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unsigned long max;
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} rlim;
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struct {
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const char *target;
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u32 request;
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u32 denied;
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uid_t ouid;
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} fs;
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};
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} apparmor_audit_data;
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#endif
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};
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/* these callback will be implemented by a specific LSM */
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@ -0,0 +1,215 @@
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/*
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* AppArmor security module
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*
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* This file contains AppArmor auditing functions
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/audit.h>
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#include <linux/socket.h>
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#include "include/apparmor.h"
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#include "include/audit.h"
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#include "include/policy.h"
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const char *op_table[] = {
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"null",
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"sysctl",
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"capable",
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"unlink",
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"mkdir",
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"rmdir",
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"mknod",
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"truncate",
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"link",
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"symlink",
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"rename_src",
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"rename_dest",
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"chmod",
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"chown",
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"getattr",
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"open",
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"file_perm",
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"file_lock",
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"file_mmap",
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"file_mprotect",
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"create",
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"post_create",
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"bind",
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"connect",
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"listen",
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"accept",
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"sendmsg",
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"recvmsg",
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"getsockname",
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"getpeername",
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"getsockopt",
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"setsockopt",
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"socket_shutdown",
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"ptrace",
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"exec",
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"change_hat",
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"change_profile",
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"change_onexec",
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"setprocattr",
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"setrlimit",
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"profile_replace",
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"profile_load",
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"profile_remove"
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};
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const char *audit_mode_names[] = {
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"normal",
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"quiet_denied",
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"quiet",
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"noquiet",
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"all"
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};
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static char *aa_audit_type[] = {
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"AUDIT",
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"ALLOWED",
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"DENIED",
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"HINT",
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"STATUS",
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"ERROR",
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"KILLED"
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};
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/*
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* Currently AppArmor auditing is fed straight into the audit framework.
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*
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* TODO:
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* netlink interface for complain mode
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* user auditing, - send user auditing to netlink interface
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* system control of whether user audit messages go to system log
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*/
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/**
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* audit_base - core AppArmor function.
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* @ab: audit buffer to fill (NOT NULL)
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* @ca: audit structure containing data to audit (NOT NULL)
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*
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* Record common AppArmor audit data from @sa
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*/
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static void audit_pre(struct audit_buffer *ab, void *ca)
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{
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struct common_audit_data *sa = ca;
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struct task_struct *tsk = sa->tsk ? sa->tsk : current;
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if (aa_g_audit_header) {
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audit_log_format(ab, "apparmor=");
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audit_log_string(ab, aa_audit_type[sa->aad.type]);
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}
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if (sa->aad.op) {
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audit_log_format(ab, " operation=");
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audit_log_string(ab, op_table[sa->aad.op]);
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}
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if (sa->aad.info) {
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audit_log_format(ab, " info=");
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audit_log_string(ab, sa->aad.info);
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if (sa->aad.error)
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audit_log_format(ab, " error=%d", sa->aad.error);
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}
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if (sa->aad.profile) {
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struct aa_profile *profile = sa->aad.profile;
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pid_t pid;
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rcu_read_lock();
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pid = tsk->real_parent->pid;
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rcu_read_unlock();
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audit_log_format(ab, " parent=%d", pid);
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if (profile->ns != root_ns) {
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audit_log_format(ab, " namespace=");
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audit_log_untrustedstring(ab, profile->ns->base.hname);
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}
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audit_log_format(ab, " profile=");
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audit_log_untrustedstring(ab, profile->base.hname);
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}
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if (sa->aad.name) {
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audit_log_format(ab, " name=");
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audit_log_untrustedstring(ab, sa->aad.name);
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}
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}
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/**
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* aa_audit_msg - Log a message to the audit subsystem
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* @sa: audit event structure (NOT NULL)
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* @cb: optional callback fn for type specific fields (MAYBE NULL)
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*/
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void aa_audit_msg(int type, struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *))
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{
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sa->aad.type = type;
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sa->lsm_pre_audit = audit_pre;
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sa->lsm_post_audit = cb;
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common_lsm_audit(sa);
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}
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/**
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* aa_audit - Log a profile based audit event to the audit subsystem
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* @type: audit type for the message
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* @profile: profile to check against (NOT NULL)
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* @gfp: allocation flags to use
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* @sa: audit event (NOT NULL)
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* @cb: optional callback fn for type specific fields (MAYBE NULL)
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*
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* Handle default message switching based off of audit mode flags
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*
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* Returns: error on failure
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*/
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int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
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struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *))
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{
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BUG_ON(!profile);
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if (type == AUDIT_APPARMOR_AUTO) {
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if (likely(!sa->aad.error)) {
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if (AUDIT_MODE(profile) != AUDIT_ALL)
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return 0;
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type = AUDIT_APPARMOR_AUDIT;
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} else if (COMPLAIN_MODE(profile))
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type = AUDIT_APPARMOR_ALLOWED;
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else
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type = AUDIT_APPARMOR_DENIED;
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}
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if (AUDIT_MODE(profile) == AUDIT_QUIET ||
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(type == AUDIT_APPARMOR_DENIED &&
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AUDIT_MODE(profile) == AUDIT_QUIET))
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return sa->aad.error;
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if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
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type = AUDIT_APPARMOR_KILL;
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if (!unconfined(profile))
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sa->aad.profile = profile;
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aa_audit_msg(type, sa, cb);
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if (sa->aad.type == AUDIT_APPARMOR_KILL)
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(void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
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if (sa->aad.type == AUDIT_APPARMOR_ALLOWED)
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return complain_error(sa->aad.error);
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return sa->aad.error;
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}
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@ -0,0 +1,123 @@
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/*
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* AppArmor security module
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*
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* This file contains AppArmor auditing function definitions.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#ifndef __AA_AUDIT_H
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#define __AA_AUDIT_H
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#include <linux/audit.h>
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#include <linux/fs.h>
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#include <linux/lsm_audit.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "file.h"
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struct aa_profile;
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extern const char *audit_mode_names[];
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#define AUDIT_MAX_INDEX 5
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#define AUDIT_APPARMOR_AUTO 0 /* auto choose audit message type */
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enum audit_mode {
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AUDIT_NORMAL, /* follow normal auditing of accesses */
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AUDIT_QUIET_DENIED, /* quiet all denied access messages */
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AUDIT_QUIET, /* quiet all messages */
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AUDIT_NOQUIET, /* do not quiet audit messages */
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AUDIT_ALL /* audit all accesses */
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};
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enum audit_type {
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AUDIT_APPARMOR_AUDIT,
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AUDIT_APPARMOR_ALLOWED,
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AUDIT_APPARMOR_DENIED,
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AUDIT_APPARMOR_HINT,
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AUDIT_APPARMOR_STATUS,
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AUDIT_APPARMOR_ERROR,
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AUDIT_APPARMOR_KILL
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};
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extern const char *op_table[];
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enum aa_ops {
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OP_NULL,
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OP_SYSCTL,
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OP_CAPABLE,
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OP_UNLINK,
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OP_MKDIR,
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OP_RMDIR,
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OP_MKNOD,
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OP_TRUNC,
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OP_LINK,
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OP_SYMLINK,
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OP_RENAME_SRC,
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OP_RENAME_DEST,
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OP_CHMOD,
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OP_CHOWN,
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OP_GETATTR,
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OP_OPEN,
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OP_FPERM,
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OP_FLOCK,
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OP_FMMAP,
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OP_FMPROT,
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OP_CREATE,
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OP_POST_CREATE,
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OP_BIND,
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OP_CONNECT,
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OP_LISTEN,
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OP_ACCEPT,
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OP_SENDMSG,
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OP_RECVMSG,
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OP_GETSOCKNAME,
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OP_GETPEERNAME,
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OP_GETSOCKOPT,
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OP_SETSOCKOPT,
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OP_SOCK_SHUTDOWN,
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OP_PTRACE,
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OP_EXEC,
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OP_CHANGE_HAT,
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OP_CHANGE_PROFILE,
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OP_CHANGE_ONEXEC,
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OP_SETPROCATTR,
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OP_SETRLIMIT,
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OP_PROF_REPL,
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OP_PROF_LOAD,
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OP_PROF_RM,
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};
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/* define a short hand for apparmor_audit_data portion of common_audit_data */
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#define aad apparmor_audit_data
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void aa_audit_msg(int type, struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *));
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int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
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struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *));
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static inline int complain_error(int error)
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{
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if (error == -EPERM || error == -EACCES)
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return 0;
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return error;
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}
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#endif /* __AA_AUDIT_H */
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