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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
39/*
40 * Currently AppArmor auditing is fed straight into the audit framework.
41 *
42 * TODO:
43 * netlink interface for complain mode
44 * user auditing, - send user auditing to netlink interface
45 * system control of whether user audit messages go to system log
46 */
47
48/**
49 * audit_base - core AppArmor function.
50 * @ab: audit buffer to fill (NOT NULL)
51 * @ca: audit structure containing data to audit (NOT NULL)
52 *
53 * Record common AppArmor audit data from @sa
54 */
55static void audit_pre(struct audit_buffer *ab, void *ca)
56{
57 struct common_audit_data *sa = ca;
58
59 if (aa_g_audit_header) {
60 audit_log_format(ab, "apparmor=");
61 audit_log_string(ab, aa_audit_type[aad(sa)->type]);
62 }
63
64 if (aad(sa)->op) {
65 audit_log_format(ab, " operation=");
66 audit_log_string(ab, aad(sa)->op);
67 }
68
69 if (aad(sa)->info) {
70 audit_log_format(ab, " info=");
71 audit_log_string(ab, aad(sa)->info);
72 if (aad(sa)->error)
73 audit_log_format(ab, " error=%d", aad(sa)->error);
74 }
75
76 if (aad(sa)->label) {
77 struct aa_label *label = aad(sa)->label;
78
79 if (label_isprofile(label)) {
80 struct aa_profile *profile = labels_profile(label);
81
82 if (profile->ns != root_ns) {
83 audit_log_format(ab, " namespace=");
84 audit_log_untrustedstring(ab,
85 profile->ns->base.hname);
86 }
87 audit_log_format(ab, " profile=");
88 audit_log_untrustedstring(ab, profile->base.hname);
89 } else {
90 audit_log_format(ab, " label=");
91 aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
92 GFP_ATOMIC);
93 }
94 }
95
96 if (aad(sa)->name) {
97 audit_log_format(ab, " name=");
98 audit_log_untrustedstring(ab, aad(sa)->name);
99 }
100}
101
102/**
103 * aa_audit_msg - Log a message to the audit subsystem
104 * @sa: audit event structure (NOT NULL)
105 * @cb: optional callback fn for type specific fields (MAYBE NULL)
106 */
107void aa_audit_msg(int type, struct common_audit_data *sa,
108 void (*cb) (struct audit_buffer *, void *))
109{
110 aad(sa)->type = type;
111 common_lsm_audit(sa, audit_pre, cb);
112}
113
114/**
115 * aa_audit - Log a profile based audit event to the audit subsystem
116 * @type: audit type for the message
117 * @profile: profile to check against (NOT NULL)
118 * @sa: audit event (NOT NULL)
119 * @cb: optional callback fn for type specific fields (MAYBE NULL)
120 *
121 * Handle default message switching based off of audit mode flags
122 *
123 * Returns: error on failure
124 */
125int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa,
126 void (*cb) (struct audit_buffer *, void *))
127{
128 AA_BUG(!profile);
129
130 if (type == AUDIT_APPARMOR_AUTO) {
131 if (likely(!aad(sa)->error)) {
132 if (AUDIT_MODE(profile) != AUDIT_ALL)
133 return 0;
134 type = AUDIT_APPARMOR_AUDIT;
135 } else if (COMPLAIN_MODE(profile))
136 type = AUDIT_APPARMOR_ALLOWED;
137 else
138 type = AUDIT_APPARMOR_DENIED;
139 }
140 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
141 (type == AUDIT_APPARMOR_DENIED &&
142 AUDIT_MODE(profile) == AUDIT_QUIET))
143 return aad(sa)->error;
144
145 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
146 type = AUDIT_APPARMOR_KILL;
147
148 aad(sa)->label = &profile->label;
149
150 aa_audit_msg(type, sa, cb);
151
152 if (aad(sa)->type == AUDIT_APPARMOR_KILL)
153 (void)send_sig_info(SIGKILL, NULL,
154 sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
155 sa->u.tsk : current);
156
157 if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
158 return complain_error(aad(sa)->error);
159
160 return aad(sa)->error;
161}
162
163struct aa_audit_rule {
164 struct aa_label *label;
165};
166
167void aa_audit_rule_free(void *vrule)
168{
169 struct aa_audit_rule *rule = vrule;
170
171 if (rule) {
172 if (!IS_ERR(rule->label))
173 aa_put_label(rule->label);
174 kfree(rule);
175 }
176}
177
178int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
179{
180 struct aa_audit_rule *rule;
181
182 switch (field) {
183 case AUDIT_SUBJ_ROLE:
184 if (op != Audit_equal && op != Audit_not_equal)
185 return -EINVAL;
186 break;
187 default:
188 return -EINVAL;
189 }
190
191 rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
192
193 if (!rule)
194 return -ENOMEM;
195
196 /* Currently rules are treated as coming from the root ns */
197 rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
198 GFP_KERNEL, true, false);
199 if (IS_ERR(rule->label)) {
200 aa_audit_rule_free(rule);
201 return PTR_ERR(rule->label);
202 }
203
204 *vrule = rule;
205 return 0;
206}
207
208int aa_audit_rule_known(struct audit_krule *rule)
209{
210 int i;
211
212 for (i = 0; i < rule->field_count; i++) {
213 struct audit_field *f = &rule->fields[i];
214
215 switch (f->type) {
216 case AUDIT_SUBJ_ROLE:
217 return 1;
218 }
219 }
220
221 return 0;
222}
223
224int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
225{
226 struct aa_audit_rule *rule = vrule;
227 struct aa_label *label;
228 int found = 0;
229
230 label = aa_secid_to_label(sid);
231
232 if (!label)
233 return -ENOENT;
234
235 if (aa_label_is_subset(label, rule->label))
236 found = 1;
237
238 switch (field) {
239 case AUDIT_SUBJ_ROLE:
240 switch (op) {
241 case Audit_equal:
242 return found;
243 case Audit_not_equal:
244 return !found;
245 }
246 }
247 return 0;
248}
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}