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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor network mediation
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2017 Canonical Ltd.
9 */
10
11#include "include/apparmor.h"
12#include "include/audit.h"
13#include "include/cred.h"
14#include "include/label.h"
15#include "include/net.h"
16#include "include/policy.h"
17#include "include/secid.h"
18
19#include "net_names.h"
20
21
22struct aa_sfs_entry aa_sfs_entry_network[] = {
23 AA_SFS_FILE_STRING("af_mask", AA_SFS_AF_MASK),
24 { }
25};
26
27static const char * const net_mask_names[] = {
28 "unknown",
29 "send",
30 "receive",
31 "unknown",
32
33 "create",
34 "shutdown",
35 "connect",
36 "unknown",
37
38 "setattr",
39 "getattr",
40 "setcred",
41 "getcred",
42
43 "chmod",
44 "chown",
45 "chgrp",
46 "lock",
47
48 "mmap",
49 "mprot",
50 "unknown",
51 "unknown",
52
53 "accept",
54 "bind",
55 "listen",
56 "unknown",
57
58 "setopt",
59 "getopt",
60 "unknown",
61 "unknown",
62
63 "unknown",
64 "unknown",
65 "unknown",
66 "unknown",
67};
68
69
70/* audit callback for net specific fields */
71void audit_net_cb(struct audit_buffer *ab, void *va)
72{
73 struct common_audit_data *sa = va;
74 struct apparmor_audit_data *ad = aad(sa);
75
76 if (address_family_names[sa->u.net->family])
77 audit_log_format(ab, " family=\"%s\"",
78 address_family_names[sa->u.net->family]);
79 else
80 audit_log_format(ab, " family=\"unknown(%d)\"",
81 sa->u.net->family);
82 if (sock_type_names[ad->net.type])
83 audit_log_format(ab, " sock_type=\"%s\"",
84 sock_type_names[ad->net.type]);
85 else
86 audit_log_format(ab, " sock_type=\"unknown(%d)\"",
87 ad->net.type);
88 audit_log_format(ab, " protocol=%d", ad->net.protocol);
89
90 if (ad->request & NET_PERMS_MASK) {
91 audit_log_format(ab, " requested_mask=");
92 aa_audit_perm_mask(ab, ad->request, NULL, 0,
93 net_mask_names, NET_PERMS_MASK);
94
95 if (ad->denied & NET_PERMS_MASK) {
96 audit_log_format(ab, " denied_mask=");
97 aa_audit_perm_mask(ab, ad->denied, NULL, 0,
98 net_mask_names, NET_PERMS_MASK);
99 }
100 }
101 if (ad->peer) {
102 audit_log_format(ab, " peer=");
103 aa_label_xaudit(ab, labels_ns(ad->subj_label), ad->peer,
104 FLAGS_NONE, GFP_ATOMIC);
105 }
106}
107
108/* Generic af perm */
109int aa_profile_af_perm(struct aa_profile *profile,
110 struct apparmor_audit_data *ad, u32 request, u16 family,
111 int type)
112{
113 struct aa_ruleset *rules = list_first_entry(&profile->rules,
114 typeof(*rules), list);
115 struct aa_perms perms = { };
116 aa_state_t state;
117 __be16 buffer[2];
118
119 AA_BUG(family >= AF_MAX);
120 AA_BUG(type < 0 || type >= SOCK_MAX);
121
122 if (profile_unconfined(profile))
123 return 0;
124 state = RULE_MEDIATES(rules, AA_CLASS_NET);
125 if (!state)
126 return 0;
127
128 buffer[0] = cpu_to_be16(family);
129 buffer[1] = cpu_to_be16((u16) type);
130 state = aa_dfa_match_len(rules->policy->dfa, state, (char *) &buffer,
131 4);
132 perms = *aa_lookup_perms(rules->policy, state);
133 aa_apply_modes_to_perms(profile, &perms);
134
135 return aa_check_perms(profile, &perms, request, ad, audit_net_cb);
136}
137
138int aa_af_perm(const struct cred *subj_cred, struct aa_label *label,
139 const char *op, u32 request, u16 family, int type, int protocol)
140{
141 struct aa_profile *profile;
142 DEFINE_AUDIT_NET(ad, op, NULL, family, type, protocol);
143
144 return fn_for_each_confined(label, profile,
145 aa_profile_af_perm(profile, &ad, request, family,
146 type));
147}
148
149static int aa_label_sk_perm(const struct cred *subj_cred,
150 struct aa_label *label,
151 const char *op, u32 request,
152 struct sock *sk)
153{
154 struct aa_sk_ctx *ctx = aa_sock(sk);
155 int error = 0;
156
157 AA_BUG(!label);
158 AA_BUG(!sk);
159
160 if (ctx->label != kernel_t && !unconfined(label)) {
161 struct aa_profile *profile;
162 DEFINE_AUDIT_SK(ad, op, sk);
163
164 ad.subj_cred = subj_cred;
165 error = fn_for_each_confined(label, profile,
166 aa_profile_af_sk_perm(profile, &ad, request, sk));
167 }
168
169 return error;
170}
171
172int aa_sk_perm(const char *op, u32 request, struct sock *sk)
173{
174 struct aa_label *label;
175 int error;
176
177 AA_BUG(!sk);
178 AA_BUG(in_interrupt());
179
180 /* TODO: switch to begin_current_label ???? */
181 label = begin_current_label_crit_section();
182 error = aa_label_sk_perm(current_cred(), label, op, request, sk);
183 end_current_label_crit_section(label);
184
185 return error;
186}
187
188
189int aa_sock_file_perm(const struct cred *subj_cred, struct aa_label *label,
190 const char *op, u32 request, struct socket *sock)
191{
192 AA_BUG(!label);
193 AA_BUG(!sock);
194 AA_BUG(!sock->sk);
195
196 return aa_label_sk_perm(subj_cred, label, op, request, sock->sk);
197}
198
199#ifdef CONFIG_NETWORK_SECMARK
200static int apparmor_secmark_init(struct aa_secmark *secmark)
201{
202 struct aa_label *label;
203
204 if (secmark->label[0] == '*') {
205 secmark->secid = AA_SECID_WILDCARD;
206 return 0;
207 }
208
209 label = aa_label_strn_parse(&root_ns->unconfined->label,
210 secmark->label, strlen(secmark->label),
211 GFP_ATOMIC, false, false);
212
213 if (IS_ERR(label))
214 return PTR_ERR(label);
215
216 secmark->secid = label->secid;
217
218 return 0;
219}
220
221static int aa_secmark_perm(struct aa_profile *profile, u32 request, u32 secid,
222 struct apparmor_audit_data *ad)
223{
224 int i, ret;
225 struct aa_perms perms = { };
226 struct aa_ruleset *rules = list_first_entry(&profile->rules,
227 typeof(*rules), list);
228
229 if (rules->secmark_count == 0)
230 return 0;
231
232 for (i = 0; i < rules->secmark_count; i++) {
233 if (!rules->secmark[i].secid) {
234 ret = apparmor_secmark_init(&rules->secmark[i]);
235 if (ret)
236 return ret;
237 }
238
239 if (rules->secmark[i].secid == secid ||
240 rules->secmark[i].secid == AA_SECID_WILDCARD) {
241 if (rules->secmark[i].deny)
242 perms.deny = ALL_PERMS_MASK;
243 else
244 perms.allow = ALL_PERMS_MASK;
245
246 if (rules->secmark[i].audit)
247 perms.audit = ALL_PERMS_MASK;
248 }
249 }
250
251 aa_apply_modes_to_perms(profile, &perms);
252
253 return aa_check_perms(profile, &perms, request, ad, audit_net_cb);
254}
255
256int apparmor_secmark_check(struct aa_label *label, char *op, u32 request,
257 u32 secid, const struct sock *sk)
258{
259 struct aa_profile *profile;
260 DEFINE_AUDIT_SK(ad, op, sk);
261
262 return fn_for_each_confined(label, profile,
263 aa_secmark_perm(profile, request, secid,
264 &ad));
265}
266#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor network mediation
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2017 Canonical Ltd.
9 */
10
11#include "include/apparmor.h"
12#include "include/audit.h"
13#include "include/cred.h"
14#include "include/label.h"
15#include "include/net.h"
16#include "include/policy.h"
17#include "include/secid.h"
18
19#include "net_names.h"
20
21
22struct aa_sfs_entry aa_sfs_entry_network[] = {
23 AA_SFS_FILE_STRING("af_mask", AA_SFS_AF_MASK),
24 { }
25};
26
27static const char * const net_mask_names[] = {
28 "unknown",
29 "send",
30 "receive",
31 "unknown",
32
33 "create",
34 "shutdown",
35 "connect",
36 "unknown",
37
38 "setattr",
39 "getattr",
40 "setcred",
41 "getcred",
42
43 "chmod",
44 "chown",
45 "chgrp",
46 "lock",
47
48 "mmap",
49 "mprot",
50 "unknown",
51 "unknown",
52
53 "accept",
54 "bind",
55 "listen",
56 "unknown",
57
58 "setopt",
59 "getopt",
60 "unknown",
61 "unknown",
62
63 "unknown",
64 "unknown",
65 "unknown",
66 "unknown",
67};
68
69
70/* audit callback for net specific fields */
71void audit_net_cb(struct audit_buffer *ab, void *va)
72{
73 struct common_audit_data *sa = va;
74
75 if (address_family_names[sa->u.net->family])
76 audit_log_format(ab, " family=\"%s\"",
77 address_family_names[sa->u.net->family]);
78 else
79 audit_log_format(ab, " family=\"unknown(%d)\"",
80 sa->u.net->family);
81 if (sock_type_names[aad(sa)->net.type])
82 audit_log_format(ab, " sock_type=\"%s\"",
83 sock_type_names[aad(sa)->net.type]);
84 else
85 audit_log_format(ab, " sock_type=\"unknown(%d)\"",
86 aad(sa)->net.type);
87 audit_log_format(ab, " protocol=%d", aad(sa)->net.protocol);
88
89 if (aad(sa)->request & NET_PERMS_MASK) {
90 audit_log_format(ab, " requested_mask=");
91 aa_audit_perm_mask(ab, aad(sa)->request, NULL, 0,
92 net_mask_names, NET_PERMS_MASK);
93
94 if (aad(sa)->denied & NET_PERMS_MASK) {
95 audit_log_format(ab, " denied_mask=");
96 aa_audit_perm_mask(ab, aad(sa)->denied, NULL, 0,
97 net_mask_names, NET_PERMS_MASK);
98 }
99 }
100 if (aad(sa)->peer) {
101 audit_log_format(ab, " peer=");
102 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
103 FLAGS_NONE, GFP_ATOMIC);
104 }
105}
106
107/* Generic af perm */
108int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
109 u32 request, u16 family, int type)
110{
111 struct aa_perms perms = { };
112 unsigned int state;
113 __be16 buffer[2];
114
115 AA_BUG(family >= AF_MAX);
116 AA_BUG(type < 0 || type >= SOCK_MAX);
117
118 if (profile_unconfined(profile))
119 return 0;
120 state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
121 if (!state)
122 return 0;
123
124 buffer[0] = cpu_to_be16(family);
125 buffer[1] = cpu_to_be16((u16) type);
126 state = aa_dfa_match_len(profile->policy.dfa, state, (char *) &buffer,
127 4);
128 aa_compute_perms(profile->policy.dfa, state, &perms);
129 aa_apply_modes_to_perms(profile, &perms);
130
131 return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
132}
133
134int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
135 int type, int protocol)
136{
137 struct aa_profile *profile;
138 DEFINE_AUDIT_NET(sa, op, NULL, family, type, protocol);
139
140 return fn_for_each_confined(label, profile,
141 aa_profile_af_perm(profile, &sa, request, family,
142 type));
143}
144
145static int aa_label_sk_perm(struct aa_label *label, const char *op, u32 request,
146 struct sock *sk)
147{
148 int error = 0;
149
150 AA_BUG(!label);
151 AA_BUG(!sk);
152
153 if (!unconfined(label)) {
154 struct aa_profile *profile;
155 DEFINE_AUDIT_SK(sa, op, sk);
156
157 error = fn_for_each_confined(label, profile,
158 aa_profile_af_sk_perm(profile, &sa, request, sk));
159 }
160
161 return error;
162}
163
164int aa_sk_perm(const char *op, u32 request, struct sock *sk)
165{
166 struct aa_label *label;
167 int error;
168
169 AA_BUG(!sk);
170 AA_BUG(in_interrupt());
171
172 /* TODO: switch to begin_current_label ???? */
173 label = begin_current_label_crit_section();
174 error = aa_label_sk_perm(label, op, request, sk);
175 end_current_label_crit_section(label);
176
177 return error;
178}
179
180
181int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
182 struct socket *sock)
183{
184 AA_BUG(!label);
185 AA_BUG(!sock);
186 AA_BUG(!sock->sk);
187
188 return aa_label_sk_perm(label, op, request, sock->sk);
189}
190
191#ifdef CONFIG_NETWORK_SECMARK
192static int apparmor_secmark_init(struct aa_secmark *secmark)
193{
194 struct aa_label *label;
195
196 if (secmark->label[0] == '*') {
197 secmark->secid = AA_SECID_WILDCARD;
198 return 0;
199 }
200
201 label = aa_label_strn_parse(&root_ns->unconfined->label,
202 secmark->label, strlen(secmark->label),
203 GFP_ATOMIC, false, false);
204
205 if (IS_ERR(label))
206 return PTR_ERR(label);
207
208 secmark->secid = label->secid;
209
210 return 0;
211}
212
213static int aa_secmark_perm(struct aa_profile *profile, u32 request, u32 secid,
214 struct common_audit_data *sa, struct sock *sk)
215{
216 int i, ret;
217 struct aa_perms perms = { };
218
219 if (profile->secmark_count == 0)
220 return 0;
221
222 for (i = 0; i < profile->secmark_count; i++) {
223 if (!profile->secmark[i].secid) {
224 ret = apparmor_secmark_init(&profile->secmark[i]);
225 if (ret)
226 return ret;
227 }
228
229 if (profile->secmark[i].secid == secid ||
230 profile->secmark[i].secid == AA_SECID_WILDCARD) {
231 if (profile->secmark[i].deny)
232 perms.deny = ALL_PERMS_MASK;
233 else
234 perms.allow = ALL_PERMS_MASK;
235
236 if (profile->secmark[i].audit)
237 perms.audit = ALL_PERMS_MASK;
238 }
239 }
240
241 aa_apply_modes_to_perms(profile, &perms);
242
243 return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
244}
245
246int apparmor_secmark_check(struct aa_label *label, char *op, u32 request,
247 u32 secid, struct sock *sk)
248{
249 struct aa_profile *profile;
250 DEFINE_AUDIT_SK(sa, op, sk);
251
252 return fn_for_each_confined(label, profile,
253 aa_secmark_perm(profile, request, secid,
254 &sa, sk));
255}
256#endif