compiler/gcc4: Make quirk for asm_volatile_goto() unconditional
[sfrench/cifs-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 *const 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 *const audit_mode_names[] = {
77         "normal",
78         "quiet_denied",
79         "quiet",
80         "noquiet",
81         "all"
82 };
83
84 static const char *const aa_audit_type[] = {
85         "AUDIT",
86         "ALLOWED",
87         "DENIED",
88         "HINT",
89         "STATUS",
90         "ERROR",
91         "KILLED",
92         "AUTO"
93 };
94
95 /*
96  * Currently AppArmor auditing is fed straight into the audit framework.
97  *
98  * TODO:
99  * netlink interface for complain mode
100  * user auditing, - send user auditing to netlink interface
101  * system control of whether user audit messages go to system log
102  */
103
104 /**
105  * audit_base - core AppArmor function.
106  * @ab: audit buffer to fill (NOT NULL)
107  * @ca: audit structure containing data to audit (NOT NULL)
108  *
109  * Record common AppArmor audit data from @sa
110  */
111 static void audit_pre(struct audit_buffer *ab, void *ca)
112 {
113         struct common_audit_data *sa = ca;
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                 if (profile->ns != root_ns) {
135                         audit_log_format(ab, " namespace=");
136                         audit_log_untrustedstring(ab, profile->ns->base.hname);
137                 }
138                 audit_log_format(ab, " profile=");
139                 audit_log_untrustedstring(ab, profile->base.hname);
140         }
141
142         if (sa->aad->name) {
143                 audit_log_format(ab, " name=");
144                 audit_log_untrustedstring(ab, sa->aad->name);
145         }
146 }
147
148 /**
149  * aa_audit_msg - Log a message to the audit subsystem
150  * @sa: audit event structure (NOT NULL)
151  * @cb: optional callback fn for type specific fields (MAYBE NULL)
152  */
153 void aa_audit_msg(int type, struct common_audit_data *sa,
154                   void (*cb) (struct audit_buffer *, void *))
155 {
156         sa->aad->type = type;
157         common_lsm_audit(sa, audit_pre, cb);
158 }
159
160 /**
161  * aa_audit - Log a profile based audit event to the audit subsystem
162  * @type: audit type for the message
163  * @profile: profile to check against (NOT NULL)
164  * @gfp: allocation flags to use
165  * @sa: audit event (NOT NULL)
166  * @cb: optional callback fn for type specific fields (MAYBE NULL)
167  *
168  * Handle default message switching based off of audit mode flags
169  *
170  * Returns: error on failure
171  */
172 int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
173              struct common_audit_data *sa,
174              void (*cb) (struct audit_buffer *, void *))
175 {
176         BUG_ON(!profile);
177
178         if (type == AUDIT_APPARMOR_AUTO) {
179                 if (likely(!sa->aad->error)) {
180                         if (AUDIT_MODE(profile) != AUDIT_ALL)
181                                 return 0;
182                         type = AUDIT_APPARMOR_AUDIT;
183                 } else if (COMPLAIN_MODE(profile))
184                         type = AUDIT_APPARMOR_ALLOWED;
185                 else
186                         type = AUDIT_APPARMOR_DENIED;
187         }
188         if (AUDIT_MODE(profile) == AUDIT_QUIET ||
189             (type == AUDIT_APPARMOR_DENIED &&
190              AUDIT_MODE(profile) == AUDIT_QUIET))
191                 return sa->aad->error;
192
193         if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
194                 type = AUDIT_APPARMOR_KILL;
195
196         if (!unconfined(profile))
197                 sa->aad->profile = profile;
198
199         aa_audit_msg(type, sa, cb);
200
201         if (sa->aad->type == AUDIT_APPARMOR_KILL)
202                 (void)send_sig_info(SIGKILL, NULL,
203                                     sa->u.tsk ?  sa->u.tsk : current);
204
205         if (sa->aad->type == AUDIT_APPARMOR_ALLOWED)
206                 return complain_error(sa->aad->error);
207
208         return sa->aad->error;
209 }