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 */
audit_pre(struct audit_buffer * ab,void * ca)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 */
aa_audit_msg(int type,struct common_audit_data * sa,void (* cb)(struct audit_buffer *,void *))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 */
aa_audit(int type,struct aa_profile * profile,gfp_t gfp,struct common_audit_data * sa,void (* cb)(struct audit_buffer *,void *))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 }
216