Loading...
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
22const 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
76const char *audit_mode_names[] = {
77 "normal",
78 "quiet_denied",
79 "quiet",
80 "noquiet",
81 "all"
82};
83
84static 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 */
110static 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 */
158void 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 */
179int 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}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor auditing functions
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#include <linux/audit.h>
12#include <linux/socket.h>
13
14#include "include/apparmor.h"
15#include "include/audit.h"
16#include "include/policy.h"
17#include "include/policy_ns.h"
18#include "include/secid.h"
19
20const char *const audit_mode_names[] = {
21 "normal",
22 "quiet_denied",
23 "quiet",
24 "noquiet",
25 "all"
26};
27
28static const char *const aa_audit_type[] = {
29 "AUDIT",
30 "ALLOWED",
31 "DENIED",
32 "HINT",
33 "STATUS",
34 "ERROR",
35 "KILLED",
36 "AUTO"
37};
38
39static const char *const aa_class_names[] = {
40 "none",
41 "unknown",
42 "file",
43 "cap",
44 "net",
45 "rlimits",
46 "domain",
47 "mount",
48 "unknown",
49 "ptrace",
50 "signal",
51 "xmatch",
52 "unknown",
53 "unknown",
54 "net",
55 "unknown",
56 "label",
57 "posix_mqueue",
58 "io_uring",
59 "module",
60 "lsm",
61 "namespace",
62 "io_uring",
63 "unknown",
64 "unknown",
65 "unknown",
66 "unknown",
67 "unknown",
68 "unknown",
69 "unknown",
70 "unknown",
71 "X",
72 "dbus",
73};
74
75
76/*
77 * Currently AppArmor auditing is fed straight into the audit framework.
78 *
79 * TODO:
80 * netlink interface for complain mode
81 * user auditing, - send user auditing to netlink interface
82 * system control of whether user audit messages go to system log
83 */
84
85/**
86 * audit_pre() - core AppArmor function.
87 * @ab: audit buffer to fill (NOT NULL)
88 * @va: audit structure containing data to audit (NOT NULL)
89 *
90 * Record common AppArmor audit data from @va
91 */
92static void audit_pre(struct audit_buffer *ab, void *va)
93{
94 struct apparmor_audit_data *ad = aad_of_va(va);
95
96 if (aa_g_audit_header) {
97 audit_log_format(ab, "apparmor=\"%s\"",
98 aa_audit_type[ad->type]);
99 }
100
101 if (ad->op)
102 audit_log_format(ab, " operation=\"%s\"", ad->op);
103
104 if (ad->class)
105 audit_log_format(ab, " class=\"%s\"",
106 ad->class <= AA_CLASS_LAST ?
107 aa_class_names[ad->class] :
108 "unknown");
109
110 if (ad->info) {
111 audit_log_format(ab, " info=\"%s\"", ad->info);
112 if (ad->error)
113 audit_log_format(ab, " error=%d", ad->error);
114 }
115
116 if (ad->subj_label) {
117 struct aa_label *label = ad->subj_label;
118
119 if (label_isprofile(label)) {
120 struct aa_profile *profile = labels_profile(label);
121
122 if (profile->ns != root_ns) {
123 audit_log_format(ab, " namespace=");
124 audit_log_untrustedstring(ab,
125 profile->ns->base.hname);
126 }
127 audit_log_format(ab, " profile=");
128 audit_log_untrustedstring(ab, profile->base.hname);
129 } else {
130 audit_log_format(ab, " label=");
131 aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
132 GFP_ATOMIC);
133 }
134 }
135
136 if (ad->name) {
137 audit_log_format(ab, " name=");
138 audit_log_untrustedstring(ab, ad->name);
139 }
140}
141
142/**
143 * aa_audit_msg - Log a message to the audit subsystem
144 * @type: audit type for the message
145 * @ad: audit event structure (NOT NULL)
146 * @cb: optional callback fn for type specific fields (MAYBE NULL)
147 */
148void aa_audit_msg(int type, struct apparmor_audit_data *ad,
149 void (*cb) (struct audit_buffer *, void *))
150{
151 ad->type = type;
152 common_lsm_audit(&ad->common, audit_pre, cb);
153}
154
155/**
156 * aa_audit - Log a profile based audit event to the audit subsystem
157 * @type: audit type for the message
158 * @profile: profile to check against (NOT NULL)
159 * @ad: audit event (NOT NULL)
160 * @cb: optional callback fn for type specific fields (MAYBE NULL)
161 *
162 * Handle default message switching based off of audit mode flags
163 *
164 * Returns: error on failure
165 */
166int aa_audit(int type, struct aa_profile *profile,
167 struct apparmor_audit_data *ad,
168 void (*cb) (struct audit_buffer *, void *))
169{
170 AA_BUG(!profile);
171
172 if (type == AUDIT_APPARMOR_AUTO) {
173 if (likely(!ad->error)) {
174 if (AUDIT_MODE(profile) != AUDIT_ALL)
175 return 0;
176 type = AUDIT_APPARMOR_AUDIT;
177 } else if (COMPLAIN_MODE(profile))
178 type = AUDIT_APPARMOR_ALLOWED;
179 else
180 type = AUDIT_APPARMOR_DENIED;
181 }
182 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
183 (type == AUDIT_APPARMOR_DENIED &&
184 AUDIT_MODE(profile) == AUDIT_QUIET_DENIED))
185 return ad->error;
186
187 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
188 type = AUDIT_APPARMOR_KILL;
189
190 ad->subj_label = &profile->label;
191
192 aa_audit_msg(type, ad, cb);
193
194 if (ad->type == AUDIT_APPARMOR_KILL)
195 (void)send_sig_info(SIGKILL, NULL,
196 ad->common.type == LSM_AUDIT_DATA_TASK &&
197 ad->common.u.tsk ? ad->common.u.tsk : current);
198
199 if (ad->type == AUDIT_APPARMOR_ALLOWED)
200 return complain_error(ad->error);
201
202 return ad->error;
203}
204
205struct aa_audit_rule {
206 struct aa_label *label;
207};
208
209void aa_audit_rule_free(void *vrule)
210{
211 struct aa_audit_rule *rule = vrule;
212
213 if (rule) {
214 if (!IS_ERR(rule->label))
215 aa_put_label(rule->label);
216 kfree(rule);
217 }
218}
219
220int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
221{
222 struct aa_audit_rule *rule;
223
224 switch (field) {
225 case AUDIT_SUBJ_ROLE:
226 if (op != Audit_equal && op != Audit_not_equal)
227 return -EINVAL;
228 break;
229 default:
230 return -EINVAL;
231 }
232
233 rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
234
235 if (!rule)
236 return -ENOMEM;
237
238 /* Currently rules are treated as coming from the root ns */
239 rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
240 GFP_KERNEL, true, false);
241 if (IS_ERR(rule->label)) {
242 int err = PTR_ERR(rule->label);
243 aa_audit_rule_free(rule);
244 return err;
245 }
246
247 *vrule = rule;
248 return 0;
249}
250
251int aa_audit_rule_known(struct audit_krule *rule)
252{
253 int i;
254
255 for (i = 0; i < rule->field_count; i++) {
256 struct audit_field *f = &rule->fields[i];
257
258 switch (f->type) {
259 case AUDIT_SUBJ_ROLE:
260 return 1;
261 }
262 }
263
264 return 0;
265}
266
267int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
268{
269 struct aa_audit_rule *rule = vrule;
270 struct aa_label *label;
271 int found = 0;
272
273 label = aa_secid_to_label(sid);
274
275 if (!label)
276 return -ENOENT;
277
278 if (aa_label_is_subset(label, rule->label))
279 found = 1;
280
281 switch (field) {
282 case AUDIT_SUBJ_ROLE:
283 switch (op) {
284 case Audit_equal:
285 return found;
286 case Audit_not_equal:
287 return !found;
288 }
289 }
290 return 0;
291}