xref: /openbmc/linux/security/apparmor/audit.c (revision 25985edc)
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 }
216