Root/security/apparmor/audit.c

1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor auditing functions
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#include <linux/audit.h>
16#include <linux/socket.h>
17
18#include "include/apparmor.h"
19#include "include/audit.h"
20#include "include/policy.h"
21
22const char *op_table[] = {
23    "null",
24
25    "sysctl",
26    "capable",
27
28    "unlink",
29    "mkdir",
30    "rmdir",
31    "mknod",
32    "truncate",
33    "link",
34    "symlink",
35    "rename_src",
36    "rename_dest",
37    "chmod",
38    "chown",
39    "getattr",
40    "open",
41
42    "file_perm",
43    "file_lock",
44    "file_mmap",
45    "file_mprotect",
46
47    "create",
48    "post_create",
49    "bind",
50    "connect",
51    "listen",
52    "accept",
53    "sendmsg",
54    "recvmsg",
55    "getsockname",
56    "getpeername",
57    "getsockopt",
58    "setsockopt",
59    "socket_shutdown",
60
61    "ptrace",
62
63    "exec",
64    "change_hat",
65    "change_profile",
66    "change_onexec",
67
68    "setprocattr",
69    "setrlimit",
70
71    "profile_replace",
72    "profile_load",
73    "profile_remove"
74};
75
76const char *audit_mode_names[] = {
77    "normal",
78    "quiet_denied",
79    "quiet",
80    "noquiet",
81    "all"
82};
83
84static char *aa_audit_type[] = {
85    "AUDIT",
86    "ALLOWED",
87    "DENIED",
88    "HINT",
89    "STATUS",
90    "ERROR",
91    "KILLED"
92};
93
94/*
95 * Currently AppArmor auditing is fed straight into the audit framework.
96 *
97 * TODO:
98 * netlink interface for complain mode
99 * user auditing, - send user auditing to netlink interface
100 * system control of whether user audit messages go to system log
101 */
102
103/**
104 * audit_base - core AppArmor function.
105 * @ab: audit buffer to fill (NOT NULL)
106 * @ca: audit structure containing data to audit (NOT NULL)
107 *
108 * Record common AppArmor audit data from @sa
109 */
110static void audit_pre(struct audit_buffer *ab, void *ca)
111{
112    struct common_audit_data *sa = ca;
113    struct task_struct *tsk = sa->tsk ? sa->tsk : current;
114
115    if (aa_g_audit_header) {
116        audit_log_format(ab, "apparmor=");
117        audit_log_string(ab, aa_audit_type[sa->aad.type]);
118    }
119
120    if (sa->aad.op) {
121        audit_log_format(ab, " operation=");
122        audit_log_string(ab, op_table[sa->aad.op]);
123    }
124
125    if (sa->aad.info) {
126        audit_log_format(ab, " info=");
127        audit_log_string(ab, sa->aad.info);
128        if (sa->aad.error)
129            audit_log_format(ab, " error=%d", sa->aad.error);
130    }
131
132    if (sa->aad.profile) {
133        struct aa_profile *profile = sa->aad.profile;
134        pid_t pid;
135        rcu_read_lock();
136        pid = tsk->real_parent->pid;
137        rcu_read_unlock();
138        audit_log_format(ab, " parent=%d", pid);
139        if (profile->ns != root_ns) {
140            audit_log_format(ab, " namespace=");
141            audit_log_untrustedstring(ab, profile->ns->base.hname);
142        }
143        audit_log_format(ab, " profile=");
144        audit_log_untrustedstring(ab, profile->base.hname);
145    }
146
147    if (sa->aad.name) {
148        audit_log_format(ab, " name=");
149        audit_log_untrustedstring(ab, sa->aad.name);
150    }
151}
152
153/**
154 * aa_audit_msg - Log a message to the audit subsystem
155 * @sa: audit event structure (NOT NULL)
156 * @cb: optional callback fn for type specific fields (MAYBE NULL)
157 */
158void aa_audit_msg(int type, struct common_audit_data *sa,
159          void (*cb) (struct audit_buffer *, void *))
160{
161    sa->aad.type = type;
162    sa->lsm_pre_audit = audit_pre;
163    sa->lsm_post_audit = cb;
164    common_lsm_audit(sa);
165}
166
167/**
168 * aa_audit - Log a profile based audit event to the audit subsystem
169 * @type: audit type for the message
170 * @profile: profile to check against (NOT NULL)
171 * @gfp: allocation flags to use
172 * @sa: audit event (NOT NULL)
173 * @cb: optional callback fn for type specific fields (MAYBE NULL)
174 *
175 * Handle default message switching based off of audit mode flags
176 *
177 * Returns: error on failure
178 */
179int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
180         struct common_audit_data *sa,
181         void (*cb) (struct audit_buffer *, void *))
182{
183    BUG_ON(!profile);
184
185    if (type == AUDIT_APPARMOR_AUTO) {
186        if (likely(!sa->aad.error)) {
187            if (AUDIT_MODE(profile) != AUDIT_ALL)
188                return 0;
189            type = AUDIT_APPARMOR_AUDIT;
190        } else if (COMPLAIN_MODE(profile))
191            type = AUDIT_APPARMOR_ALLOWED;
192        else
193            type = AUDIT_APPARMOR_DENIED;
194    }
195    if (AUDIT_MODE(profile) == AUDIT_QUIET ||
196        (type == AUDIT_APPARMOR_DENIED &&
197         AUDIT_MODE(profile) == AUDIT_QUIET))
198        return sa->aad.error;
199
200    if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
201        type = AUDIT_APPARMOR_KILL;
202
203    if (!unconfined(profile))
204        sa->aad.profile = profile;
205
206    aa_audit_msg(type, sa, cb);
207
208    if (sa->aad.type == AUDIT_APPARMOR_KILL)
209        (void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
210
211    if (sa->aad.type == AUDIT_APPARMOR_ALLOWED)
212        return complain_error(sa->aad.error);
213
214    return sa->aad.error;
215}
216

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