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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
22const 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
76const char *const audit_mode_names[] = {
77 "normal",
78 "quiet_denied",
79 "quiet",
80 "noquiet",
81 "all"
82};
83
84static 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 */
111static void audit_pre(struct audit_buffer *ab, void *ca)
112{
113 struct common_audit_data *sa = ca;
114 struct task_struct *tsk = sa->aad->tsk ? sa->aad->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 if (sa->aad->tsk) {
154 audit_log_format(ab, " pid=%d comm=", tsk->pid);
155 audit_log_untrustedstring(ab, tsk->comm);
156 }
157
158}
159
160/**
161 * aa_audit_msg - Log a message to the audit subsystem
162 * @sa: audit event structure (NOT NULL)
163 * @cb: optional callback fn for type specific fields (MAYBE NULL)
164 */
165void aa_audit_msg(int type, struct common_audit_data *sa,
166 void (*cb) (struct audit_buffer *, void *))
167{
168 sa->aad->type = type;
169 common_lsm_audit(sa, audit_pre, cb);
170}
171
172/**
173 * aa_audit - Log a profile based audit event to the audit subsystem
174 * @type: audit type for the message
175 * @profile: profile to check against (NOT NULL)
176 * @gfp: allocation flags to use
177 * @sa: audit event (NOT NULL)
178 * @cb: optional callback fn for type specific fields (MAYBE NULL)
179 *
180 * Handle default message switching based off of audit mode flags
181 *
182 * Returns: error on failure
183 */
184int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
185 struct common_audit_data *sa,
186 void (*cb) (struct audit_buffer *, void *))
187{
188 BUG_ON(!profile);
189
190 if (type == AUDIT_APPARMOR_AUTO) {
191 if (likely(!sa->aad->error)) {
192 if (AUDIT_MODE(profile) != AUDIT_ALL)
193 return 0;
194 type = AUDIT_APPARMOR_AUDIT;
195 } else if (COMPLAIN_MODE(profile))
196 type = AUDIT_APPARMOR_ALLOWED;
197 else
198 type = AUDIT_APPARMOR_DENIED;
199 }
200 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
201 (type == AUDIT_APPARMOR_DENIED &&
202 AUDIT_MODE(profile) == AUDIT_QUIET))
203 return sa->aad->error;
204
205 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
206 type = AUDIT_APPARMOR_KILL;
207
208 if (!unconfined(profile))
209 sa->aad->profile = profile;
210
211 aa_audit_msg(type, sa, cb);
212
213 if (sa->aad->type == AUDIT_APPARMOR_KILL)
214 (void)send_sig_info(SIGKILL, NULL,
215 sa->aad->tsk ? sa->aad->tsk : current);
216
217 if (sa->aad->type == AUDIT_APPARMOR_ALLOWED)
218 return complain_error(sa->aad->error);
219
220 return sa->aad->error;
221}
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 "unknown",
62 "unknown",
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 * @ca: audit structure containing data to audit (NOT NULL)
89 *
90 * Record common AppArmor audit data from @sa
91 */
92static void audit_pre(struct audit_buffer *ab, void *ca)
93{
94 struct common_audit_data *sa = ca;
95
96 if (aa_g_audit_header) {
97 audit_log_format(ab, "apparmor=\"%s\"",
98 aa_audit_type[aad(sa)->type]);
99 }
100
101 if (aad(sa)->op) {
102 audit_log_format(ab, " operation=\"%s\"", aad(sa)->op);
103 }
104
105 if (aad(sa)->class)
106 audit_log_format(ab, " class=\"%s\"",
107 aad(sa)->class <= AA_CLASS_LAST ?
108 aa_class_names[aad(sa)->class] :
109 "unknown");
110
111 if (aad(sa)->info) {
112 audit_log_format(ab, " info=\"%s\"", aad(sa)->info);
113 if (aad(sa)->error)
114 audit_log_format(ab, " error=%d", aad(sa)->error);
115 }
116
117 if (aad(sa)->label) {
118 struct aa_label *label = aad(sa)->label;
119
120 if (label_isprofile(label)) {
121 struct aa_profile *profile = labels_profile(label);
122
123 if (profile->ns != root_ns) {
124 audit_log_format(ab, " namespace=");
125 audit_log_untrustedstring(ab,
126 profile->ns->base.hname);
127 }
128 audit_log_format(ab, " profile=");
129 audit_log_untrustedstring(ab, profile->base.hname);
130 } else {
131 audit_log_format(ab, " label=");
132 aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
133 GFP_ATOMIC);
134 }
135 }
136
137 if (aad(sa)->name) {
138 audit_log_format(ab, " name=");
139 audit_log_untrustedstring(ab, aad(sa)->name);
140 }
141}
142
143/**
144 * aa_audit_msg - Log a message to the audit subsystem
145 * @sa: audit event structure (NOT NULL)
146 * @cb: optional callback fn for type specific fields (MAYBE NULL)
147 */
148void aa_audit_msg(int type, struct common_audit_data *sa,
149 void (*cb) (struct audit_buffer *, void *))
150{
151 aad(sa)->type = type;
152 common_lsm_audit(sa, 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 * @sa: 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, struct common_audit_data *sa,
167 void (*cb) (struct audit_buffer *, void *))
168{
169 AA_BUG(!profile);
170
171 if (type == AUDIT_APPARMOR_AUTO) {
172 if (likely(!aad(sa)->error)) {
173 if (AUDIT_MODE(profile) != AUDIT_ALL)
174 return 0;
175 type = AUDIT_APPARMOR_AUDIT;
176 } else if (COMPLAIN_MODE(profile))
177 type = AUDIT_APPARMOR_ALLOWED;
178 else
179 type = AUDIT_APPARMOR_DENIED;
180 }
181 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
182 (type == AUDIT_APPARMOR_DENIED &&
183 AUDIT_MODE(profile) == AUDIT_QUIET_DENIED))
184 return aad(sa)->error;
185
186 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
187 type = AUDIT_APPARMOR_KILL;
188
189 aad(sa)->label = &profile->label;
190
191 aa_audit_msg(type, sa, cb);
192
193 if (aad(sa)->type == AUDIT_APPARMOR_KILL)
194 (void)send_sig_info(SIGKILL, NULL,
195 sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
196 sa->u.tsk : current);
197
198 if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
199 return complain_error(aad(sa)->error);
200
201 return aad(sa)->error;
202}
203
204struct aa_audit_rule {
205 struct aa_label *label;
206};
207
208void aa_audit_rule_free(void *vrule)
209{
210 struct aa_audit_rule *rule = vrule;
211
212 if (rule) {
213 if (!IS_ERR(rule->label))
214 aa_put_label(rule->label);
215 kfree(rule);
216 }
217}
218
219int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
220{
221 struct aa_audit_rule *rule;
222
223 switch (field) {
224 case AUDIT_SUBJ_ROLE:
225 if (op != Audit_equal && op != Audit_not_equal)
226 return -EINVAL;
227 break;
228 default:
229 return -EINVAL;
230 }
231
232 rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
233
234 if (!rule)
235 return -ENOMEM;
236
237 /* Currently rules are treated as coming from the root ns */
238 rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
239 GFP_KERNEL, true, false);
240 if (IS_ERR(rule->label)) {
241 int err = PTR_ERR(rule->label);
242 aa_audit_rule_free(rule);
243 return err;
244 }
245
246 *vrule = rule;
247 return 0;
248}
249
250int aa_audit_rule_known(struct audit_krule *rule)
251{
252 int i;
253
254 for (i = 0; i < rule->field_count; i++) {
255 struct audit_field *f = &rule->fields[i];
256
257 switch (f->type) {
258 case AUDIT_SUBJ_ROLE:
259 return 1;
260 }
261 }
262
263 return 0;
264}
265
266int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
267{
268 struct aa_audit_rule *rule = vrule;
269 struct aa_label *label;
270 int found = 0;
271
272 label = aa_secid_to_label(sid);
273
274 if (!label)
275 return -ENOENT;
276
277 if (aa_label_is_subset(label, rule->label))
278 found = 1;
279
280 switch (field) {
281 case AUDIT_SUBJ_ROLE:
282 switch (op) {
283 case Audit_equal:
284 return found;
285 case Audit_not_equal:
286 return !found;
287 }
288 }
289 return 0;
290}