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v5.4
  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}
v5.9
  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=\"%s\"",
 61				 aa_audit_type[aad(sa)->type]);
 62	}
 63
 64	if (aad(sa)->op) {
 65		audit_log_format(ab, " operation=\"%s\"", aad(sa)->op);
 
 66	}
 67
 68	if (aad(sa)->info) {
 69		audit_log_format(ab, " info=\"%s\"", aad(sa)->info);
 
 70		if (aad(sa)->error)
 71			audit_log_format(ab, " error=%d", aad(sa)->error);
 72	}
 73
 74	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);
 91		}
 92	}
 93
 94	if (aad(sa)->name) {
 95		audit_log_format(ab, " name=");
 96		audit_log_untrustedstring(ab, aad(sa)->name);
 97	}
 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{
108	aad(sa)->type = type;
109	common_lsm_audit(sa, audit_pre, cb);
110}
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)
116 * @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 */
123int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa,
124	     void (*cb) (struct audit_buffer *, void *))
125{
126	AA_BUG(!profile);
127
128	if (type == AUDIT_APPARMOR_AUTO) {
129		if (likely(!aad(sa)->error)) {
130			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))
141		return aad(sa)->error;
142
143	if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
144		type = AUDIT_APPARMOR_KILL;
145
146	aad(sa)->label = &profile->label;
147
148	aa_audit_msg(type, sa, cb);
149
150	if (aad(sa)->type == AUDIT_APPARMOR_KILL)
151		(void)send_sig_info(SIGKILL, NULL,
152			sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
153				    sa->u.tsk : current);
154
155	if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
156		return complain_error(aad(sa)->error);
157
158	return aad(sa)->error;
159}
160
161struct aa_audit_rule {
162	struct aa_label *label;
163};
164
165void aa_audit_rule_free(void *vrule)
166{
167	struct aa_audit_rule *rule = vrule;
168
169	if (rule) {
170		if (!IS_ERR(rule->label))
171			aa_put_label(rule->label);
172		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
194	/* 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);
197	if (IS_ERR(rule->label)) {
198		int err = PTR_ERR(rule->label);
199		aa_audit_rule_free(rule);
200		return err;
201	}
202
203	*vrule = rule;
204	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
223int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
224{
225	struct aa_audit_rule *rule = vrule;
226	struct aa_label *label;
227	int found = 0;
228
229	label = aa_secid_to_label(sid);
230
231	if (!label)
232		return -ENOENT;
233
234	if (aa_label_is_subset(label, rule->label))
235		found = 1;
236
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}