tracelevel module: Prioritize trace events
[linux-2.6.git] / 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
22 const 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
76 const char *audit_mode_names[] = {
77         "normal",
78         "quiet_denied",
79         "quiet",
80         "noquiet",
81         "all"
82 };
83
84 static 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  */
110 static 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  */
158 void 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  */
179 int 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 }