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Linux/security/apparmor/audit.c

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  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 }
210 

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