blob: f7e97c7e80f3d400e55436d2f800ac2fd37fa374 [file] [log] [blame]
Thomas Gleixnerb886d83c2019-06-01 10:08:55 +02001// SPDX-License-Identifier: GPL-2.0-only
John Johansen67012e82010-07-29 14:47:58 -07002/*
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.
John Johansen67012e82010-07-29 14:47:58 -07009 */
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"
John Johansencff281f2017-01-16 00:42:15 -080017#include "include/policy_ns.h"
Matthew Garrette79c26d2018-04-16 11:23:58 -070018#include "include/secid.h"
John Johansen67012e82010-07-29 14:47:58 -070019
Jan Engelhardt2d4cee72012-03-14 13:30:36 +010020const char *const audit_mode_names[] = {
John Johansen67012e82010-07-29 14:47:58 -070021 "normal",
22 "quiet_denied",
23 "quiet",
24 "noquiet",
25 "all"
26};
27
Jan Engelhardt2d4cee72012-03-14 13:30:36 +010028static const char *const aa_audit_type[] = {
John Johansen67012e82010-07-29 14:47:58 -070029 "AUDIT",
30 "ALLOWED",
31 "DENIED",
32 "HINT",
33 "STATUS",
34 "ERROR",
John Johansenb492d502013-02-18 16:13:34 -080035 "KILLED",
John Johansenade3ddc2012-02-22 00:20:26 -080036 "AUTO"
John Johansen67012e82010-07-29 14:47:58 -070037};
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;
John Johansen67012e82010-07-29 14:47:58 -070058
59 if (aa_g_audit_header) {
Richard Guy Briggsf1d9b232020-07-13 15:51:59 -040060 audit_log_format(ab, "apparmor=\"%s\"",
61 aa_audit_type[aad(sa)->type]);
John Johansen67012e82010-07-29 14:47:58 -070062 }
63
John Johansenef88a7a2017-01-16 00:43:02 -080064 if (aad(sa)->op) {
Richard Guy Briggsf1d9b232020-07-13 15:51:59 -040065 audit_log_format(ab, " operation=\"%s\"", aad(sa)->op);
John Johansen67012e82010-07-29 14:47:58 -070066 }
67
John Johansenef88a7a2017-01-16 00:43:02 -080068 if (aad(sa)->info) {
Richard Guy Briggsf1d9b232020-07-13 15:51:59 -040069 audit_log_format(ab, " info=\"%s\"", aad(sa)->info);
John Johansenef88a7a2017-01-16 00:43:02 -080070 if (aad(sa)->error)
71 audit_log_format(ab, " error=%d", aad(sa)->error);
John Johansen67012e82010-07-29 14:47:58 -070072 }
73
John Johansen637f6882017-06-09 08:14:28 -070074 if (aad(sa)->label) {
75 struct aa_label *label = aad(sa)->label;
76
77 if (label_isprofile(label)) {
78 struct aa_profile *profile = labels_profile(label);
79
80 if (profile->ns != root_ns) {
81 audit_log_format(ab, " namespace=");
82 audit_log_untrustedstring(ab,
83 profile->ns->base.hname);
84 }
85 audit_log_format(ab, " profile=");
86 audit_log_untrustedstring(ab, profile->base.hname);
87 } else {
88 audit_log_format(ab, " label=");
89 aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
90 GFP_ATOMIC);
John Johansen67012e82010-07-29 14:47:58 -070091 }
John Johansen67012e82010-07-29 14:47:58 -070092 }
93
John Johansenef88a7a2017-01-16 00:43:02 -080094 if (aad(sa)->name) {
John Johansen67012e82010-07-29 14:47:58 -070095 audit_log_format(ab, " name=");
John Johansenef88a7a2017-01-16 00:43:02 -080096 audit_log_untrustedstring(ab, aad(sa)->name);
John Johansen67012e82010-07-29 14:47:58 -070097 }
98}
99
100/**
101 * aa_audit_msg - Log a message to the audit subsystem
102 * @sa: audit event structure (NOT NULL)
103 * @cb: optional callback fn for type specific fields (MAYBE NULL)
104 */
105void aa_audit_msg(int type, struct common_audit_data *sa,
106 void (*cb) (struct audit_buffer *, void *))
107{
John Johansenef88a7a2017-01-16 00:43:02 -0800108 aad(sa)->type = type;
Linus Torvaldsb61c37f2012-04-02 15:48:12 -0700109 common_lsm_audit(sa, audit_pre, cb);
John Johansen67012e82010-07-29 14:47:58 -0700110}
111
112/**
113 * aa_audit - Log a profile based audit event to the audit subsystem
114 * @type: audit type for the message
115 * @profile: profile to check against (NOT NULL)
John Johansen67012e82010-07-29 14:47:58 -0700116 * @sa: audit event (NOT NULL)
117 * @cb: optional callback fn for type specific fields (MAYBE NULL)
118 *
119 * Handle default message switching based off of audit mode flags
120 *
121 * Returns: error on failure
122 */
John Johansenef88a7a2017-01-16 00:43:02 -0800123int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa,
John Johansen67012e82010-07-29 14:47:58 -0700124 void (*cb) (struct audit_buffer *, void *))
125{
John Johansene6bfa252017-01-16 00:43:15 -0800126 AA_BUG(!profile);
John Johansen67012e82010-07-29 14:47:58 -0700127
128 if (type == AUDIT_APPARMOR_AUTO) {
John Johansenef88a7a2017-01-16 00:43:02 -0800129 if (likely(!aad(sa)->error)) {
John Johansen67012e82010-07-29 14:47:58 -0700130 if (AUDIT_MODE(profile) != AUDIT_ALL)
131 return 0;
132 type = AUDIT_APPARMOR_AUDIT;
133 } else if (COMPLAIN_MODE(profile))
134 type = AUDIT_APPARMOR_ALLOWED;
135 else
136 type = AUDIT_APPARMOR_DENIED;
137 }
138 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
139 (type == AUDIT_APPARMOR_DENIED &&
140 AUDIT_MODE(profile) == AUDIT_QUIET))
John Johansenef88a7a2017-01-16 00:43:02 -0800141 return aad(sa)->error;
John Johansen67012e82010-07-29 14:47:58 -0700142
143 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
144 type = AUDIT_APPARMOR_KILL;
145
John Johansen637f6882017-06-09 08:14:28 -0700146 aad(sa)->label = &profile->label;
John Johansen67012e82010-07-29 14:47:58 -0700147
148 aa_audit_msg(type, sa, cb);
149
John Johansenef88a7a2017-01-16 00:43:02 -0800150 if (aad(sa)->type == AUDIT_APPARMOR_KILL)
Eric Paris0972c742012-04-04 15:01:42 -0400151 (void)send_sig_info(SIGKILL, NULL,
John Johansenb6b1b812014-06-08 11:20:54 -0700152 sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
153 sa->u.tsk : current);
John Johansen67012e82010-07-29 14:47:58 -0700154
John Johansenef88a7a2017-01-16 00:43:02 -0800155 if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
156 return complain_error(aad(sa)->error);
John Johansen67012e82010-07-29 14:47:58 -0700157
John Johansenef88a7a2017-01-16 00:43:02 -0800158 return aad(sa)->error;
John Johansen67012e82010-07-29 14:47:58 -0700159}
Matthew Garrette79c26d2018-04-16 11:23:58 -0700160
161struct aa_audit_rule {
John Johansen2ab47da2018-05-03 00:39:58 -0700162 struct aa_label *label;
Matthew Garrette79c26d2018-04-16 11:23:58 -0700163};
164
165void aa_audit_rule_free(void *vrule)
166{
167 struct aa_audit_rule *rule = vrule;
168
169 if (rule) {
John Johansen2ab47da2018-05-03 00:39:58 -0700170 if (!IS_ERR(rule->label))
171 aa_put_label(rule->label);
Matthew Garrette79c26d2018-04-16 11:23:58 -0700172 kfree(rule);
173 }
174}
175
176int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
177{
178 struct aa_audit_rule *rule;
179
180 switch (field) {
181 case AUDIT_SUBJ_ROLE:
182 if (op != Audit_equal && op != Audit_not_equal)
183 return -EINVAL;
184 break;
185 default:
186 return -EINVAL;
187 }
188
189 rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
190
191 if (!rule)
192 return -ENOMEM;
193
John Johansen2ab47da2018-05-03 00:39:58 -0700194 /* Currently rules are treated as coming from the root ns */
195 rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
196 GFP_KERNEL, true, false);
Tyler Hicks52e8c382018-05-17 19:53:45 +0000197 if (IS_ERR(rule->label)) {
Navid Emamdoostc54d4812019-10-21 10:23:47 -0500198 int err = PTR_ERR(rule->label);
Tyler Hicks52e8c382018-05-17 19:53:45 +0000199 aa_audit_rule_free(rule);
Navid Emamdoostc54d4812019-10-21 10:23:47 -0500200 return err;
Tyler Hicks52e8c382018-05-17 19:53:45 +0000201 }
Matthew Garrette79c26d2018-04-16 11:23:58 -0700202
Tyler Hicks52e8c382018-05-17 19:53:45 +0000203 *vrule = rule;
Matthew Garrette79c26d2018-04-16 11:23:58 -0700204 return 0;
205}
206
207int aa_audit_rule_known(struct audit_krule *rule)
208{
209 int i;
210
211 for (i = 0; i < rule->field_count; i++) {
212 struct audit_field *f = &rule->fields[i];
213
214 switch (f->type) {
215 case AUDIT_SUBJ_ROLE:
216 return 1;
217 }
218 }
219
220 return 0;
221}
222
Richard Guy Briggs90462a52019-01-31 11:52:11 -0500223int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
Matthew Garrette79c26d2018-04-16 11:23:58 -0700224{
225 struct aa_audit_rule *rule = vrule;
226 struct aa_label *label;
Matthew Garrette79c26d2018-04-16 11:23:58 -0700227 int found = 0;
228
229 label = aa_secid_to_label(sid);
230
231 if (!label)
232 return -ENOENT;
233
John Johansen2ab47da2018-05-03 00:39:58 -0700234 if (aa_label_is_subset(label, rule->label))
235 found = 1;
Matthew Garrette79c26d2018-04-16 11:23:58 -0700236
237 switch (field) {
238 case AUDIT_SUBJ_ROLE:
239 switch (op) {
240 case Audit_equal:
241 return found;
242 case Audit_not_equal:
243 return !found;
244 }
245 }
246 return 0;
247}