LSM: shrink sizeof LSM specific portion of common_audit_data
[~shefty/rdma-dev.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         struct task_struct *tsk = sa->tsk ? sa->tsk : current;
115
116         if (aa_g_audit_header) {
117                 audit_log_format(ab, "apparmor=");
118                 audit_log_string(ab, aa_audit_type[sa->aad->type]);
119         }
120
121         if (sa->aad->op) {
122                 audit_log_format(ab, " operation=");
123                 audit_log_string(ab, op_table[sa->aad->op]);
124         }
125
126         if (sa->aad->info) {
127                 audit_log_format(ab, " info=");
128                 audit_log_string(ab, sa->aad->info);
129                 if (sa->aad->error)
130                         audit_log_format(ab, " error=%d", sa->aad->error);
131         }
132
133         if (sa->aad->profile) {
134                 struct aa_profile *profile = sa->aad->profile;
135                 pid_t pid;
136                 rcu_read_lock();
137                 pid = rcu_dereference(tsk->real_parent)->pid;
138                 rcu_read_unlock();
139                 audit_log_format(ab, " parent=%d", pid);
140                 if (profile->ns != root_ns) {
141                         audit_log_format(ab, " namespace=");
142                         audit_log_untrustedstring(ab, profile->ns->base.hname);
143                 }
144                 audit_log_format(ab, " profile=");
145                 audit_log_untrustedstring(ab, profile->base.hname);
146         }
147
148         if (sa->aad->name) {
149                 audit_log_format(ab, " name=");
150                 audit_log_untrustedstring(ab, sa->aad->name);
151         }
152 }
153
154 /**
155  * aa_audit_msg - Log a message to the audit subsystem
156  * @sa: audit event structure (NOT NULL)
157  * @cb: optional callback fn for type specific fields (MAYBE NULL)
158  */
159 void aa_audit_msg(int type, struct common_audit_data *sa,
160                   void (*cb) (struct audit_buffer *, void *))
161 {
162         sa->aad->type = type;
163         sa->lsm_pre_audit = audit_pre;
164         sa->lsm_post_audit = cb;
165         common_lsm_audit(sa);
166 }
167
168 /**
169  * aa_audit - Log a profile based audit event to the audit subsystem
170  * @type: audit type for the message
171  * @profile: profile to check against (NOT NULL)
172  * @gfp: allocation flags to use
173  * @sa: audit event (NOT NULL)
174  * @cb: optional callback fn for type specific fields (MAYBE NULL)
175  *
176  * Handle default message switching based off of audit mode flags
177  *
178  * Returns: error on failure
179  */
180 int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
181              struct common_audit_data *sa,
182              void (*cb) (struct audit_buffer *, void *))
183 {
184         BUG_ON(!profile);
185
186         if (type == AUDIT_APPARMOR_AUTO) {
187                 if (likely(!sa->aad->error)) {
188                         if (AUDIT_MODE(profile) != AUDIT_ALL)
189                                 return 0;
190                         type = AUDIT_APPARMOR_AUDIT;
191                 } else if (COMPLAIN_MODE(profile))
192                         type = AUDIT_APPARMOR_ALLOWED;
193                 else
194                         type = AUDIT_APPARMOR_DENIED;
195         }
196         if (AUDIT_MODE(profile) == AUDIT_QUIET ||
197             (type == AUDIT_APPARMOR_DENIED &&
198              AUDIT_MODE(profile) == AUDIT_QUIET))
199                 return sa->aad->error;
200
201         if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
202                 type = AUDIT_APPARMOR_KILL;
203
204         if (!unconfined(profile))
205                 sa->aad->profile = profile;
206
207         aa_audit_msg(type, sa, cb);
208
209         if (sa->aad->type == AUDIT_APPARMOR_KILL)
210                 (void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
211
212         if (sa->aad->type == AUDIT_APPARMOR_ALLOWED)
213                 return complain_error(sa->aad->error);
214
215         return sa->aad->error;
216 }