Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-6.2-pull-request...
[qemu.git] / crypto / tlscredspsk.c
1 /*
2 * QEMU crypto TLS Pre-Shared Keys (PSK) support
3 *
4 * Copyright (c) 2018 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "crypto/tlscredspsk.h"
23 #include "tlscredspriv.h"
24 #include "qapi/error.h"
25 #include "qemu/module.h"
26 #include "qom/object_interfaces.h"
27 #include "trace.h"
28
29
30 #ifdef CONFIG_GNUTLS
31
32 #include <gnutls/gnutls.h>
33
34 static int
35 lookup_key(const char *pskfile, const char *username, gnutls_datum_t *key,
36 Error **errp)
37 {
38 const size_t ulen = strlen(username);
39 GError *gerr = NULL;
40 char *content = NULL;
41 char **lines = NULL;
42 size_t clen = 0, i;
43 int ret = -1;
44
45 if (!g_file_get_contents(pskfile, &content, &clen, &gerr)) {
46 error_setg(errp, "Cannot read PSK file %s: %s",
47 pskfile, gerr->message);
48 g_error_free(gerr);
49 return -1;
50 }
51
52 lines = g_strsplit(content, "\n", -1);
53 for (i = 0; lines[i] != NULL; ++i) {
54 if (strncmp(lines[i], username, ulen) == 0 && lines[i][ulen] == ':') {
55 key->data = (unsigned char *) g_strdup(&lines[i][ulen + 1]);
56 key->size = strlen(lines[i]) - ulen - 1;
57 ret = 0;
58 goto out;
59 }
60 }
61 error_setg(errp, "Username %s not found in PSK file %s",
62 username, pskfile);
63
64 out:
65 free(content);
66 g_strfreev(lines);
67 return ret;
68 }
69
70 static int
71 qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds,
72 Error **errp)
73 {
74 g_autofree char *pskfile = NULL;
75 g_autofree char *dhparams = NULL;
76 const char *username;
77 int ret;
78 int rv = -1;
79 gnutls_datum_t key = { .data = NULL };
80
81 trace_qcrypto_tls_creds_psk_load(creds,
82 creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
83
84 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
85 if (creds->username) {
86 error_setg(errp, "username should not be set when endpoint=server");
87 goto cleanup;
88 }
89
90 if (qcrypto_tls_creds_get_path(&creds->parent_obj,
91 QCRYPTO_TLS_CREDS_DH_PARAMS,
92 false, &dhparams, errp) < 0 ||
93 qcrypto_tls_creds_get_path(&creds->parent_obj,
94 QCRYPTO_TLS_CREDS_PSKFILE,
95 true, &pskfile, errp) < 0) {
96 goto cleanup;
97 }
98
99 ret = gnutls_psk_allocate_server_credentials(&creds->data.server);
100 if (ret < 0) {
101 error_setg(errp, "Cannot allocate credentials: %s",
102 gnutls_strerror(ret));
103 goto cleanup;
104 }
105
106 if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
107 &creds->parent_obj.dh_params,
108 errp) < 0) {
109 goto cleanup;
110 }
111
112 gnutls_psk_set_server_credentials_file(creds->data.server, pskfile);
113 gnutls_psk_set_server_dh_params(creds->data.server,
114 creds->parent_obj.dh_params);
115 } else {
116 if (qcrypto_tls_creds_get_path(&creds->parent_obj,
117 QCRYPTO_TLS_CREDS_PSKFILE,
118 true, &pskfile, errp) < 0) {
119 goto cleanup;
120 }
121
122 if (creds->username) {
123 username = creds->username;
124 } else {
125 username = "qemu";
126 }
127 if (lookup_key(pskfile, username, &key, errp) != 0) {
128 goto cleanup;
129 }
130
131 ret = gnutls_psk_allocate_client_credentials(&creds->data.client);
132 if (ret < 0) {
133 error_setg(errp, "Cannot allocate credentials: %s",
134 gnutls_strerror(ret));
135 goto cleanup;
136 }
137
138 gnutls_psk_set_client_credentials(creds->data.client,
139 username, &key, GNUTLS_PSK_KEY_HEX);
140 }
141
142 rv = 0;
143 cleanup:
144 g_free(key.data);
145 return rv;
146 }
147
148
149 static void
150 qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds)
151 {
152 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
153 if (creds->data.client) {
154 gnutls_psk_free_client_credentials(creds->data.client);
155 creds->data.client = NULL;
156 }
157 } else {
158 if (creds->data.server) {
159 gnutls_psk_free_server_credentials(creds->data.server);
160 creds->data.server = NULL;
161 }
162 }
163 if (creds->parent_obj.dh_params) {
164 gnutls_dh_params_deinit(creds->parent_obj.dh_params);
165 creds->parent_obj.dh_params = NULL;
166 }
167 }
168
169 #else /* ! CONFIG_GNUTLS */
170
171
172 static void
173 qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED,
174 Error **errp)
175 {
176 error_setg(errp, "TLS credentials support requires GNUTLS");
177 }
178
179
180 static void
181 qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED)
182 {
183 /* nada */
184 }
185
186
187 #endif /* ! CONFIG_GNUTLS */
188
189
190 static void
191 qcrypto_tls_creds_psk_prop_set_loaded(Object *obj,
192 bool value,
193 Error **errp)
194 {
195 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
196
197 qcrypto_tls_creds_psk_unload(creds);
198 if (value) {
199 qcrypto_tls_creds_psk_load(creds, errp);
200 }
201 }
202
203
204 #ifdef CONFIG_GNUTLS
205
206
207 static bool
208 qcrypto_tls_creds_psk_prop_get_loaded(Object *obj,
209 Error **errp G_GNUC_UNUSED)
210 {
211 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
212
213 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
214 return creds->data.server != NULL;
215 } else {
216 return creds->data.client != NULL;
217 }
218 }
219
220
221 #else /* ! CONFIG_GNUTLS */
222
223
224 static bool
225 qcrypto_tls_creds_psk_prop_get_loaded(Object *obj G_GNUC_UNUSED,
226 Error **errp G_GNUC_UNUSED)
227 {
228 return false;
229 }
230
231
232 #endif /* ! CONFIG_GNUTLS */
233
234
235 static void
236 qcrypto_tls_creds_psk_complete(UserCreatable *uc, Error **errp)
237 {
238 object_property_set_bool(OBJECT(uc), "loaded", true, errp);
239 }
240
241
242 static void
243 qcrypto_tls_creds_psk_finalize(Object *obj)
244 {
245 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
246
247 qcrypto_tls_creds_psk_unload(creds);
248 }
249
250 static void
251 qcrypto_tls_creds_psk_prop_set_username(Object *obj,
252 const char *value,
253 Error **errp G_GNUC_UNUSED)
254 {
255 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
256
257 creds->username = g_strdup(value);
258 }
259
260
261 static char *
262 qcrypto_tls_creds_psk_prop_get_username(Object *obj,
263 Error **errp G_GNUC_UNUSED)
264 {
265 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
266
267 return g_strdup(creds->username);
268 }
269
270 static void
271 qcrypto_tls_creds_psk_class_init(ObjectClass *oc, void *data)
272 {
273 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
274
275 ucc->complete = qcrypto_tls_creds_psk_complete;
276
277 object_class_property_add_bool(oc, "loaded",
278 qcrypto_tls_creds_psk_prop_get_loaded,
279 qcrypto_tls_creds_psk_prop_set_loaded);
280 object_class_property_add_str(oc, "username",
281 qcrypto_tls_creds_psk_prop_get_username,
282 qcrypto_tls_creds_psk_prop_set_username);
283 }
284
285
286 static const TypeInfo qcrypto_tls_creds_psk_info = {
287 .parent = TYPE_QCRYPTO_TLS_CREDS,
288 .name = TYPE_QCRYPTO_TLS_CREDS_PSK,
289 .instance_size = sizeof(QCryptoTLSCredsPSK),
290 .instance_finalize = qcrypto_tls_creds_psk_finalize,
291 .class_size = sizeof(QCryptoTLSCredsPSKClass),
292 .class_init = qcrypto_tls_creds_psk_class_init,
293 .interfaces = (InterfaceInfo[]) {
294 { TYPE_USER_CREATABLE },
295 { }
296 }
297 };
298
299
300 static void
301 qcrypto_tls_creds_psk_register_types(void)
302 {
303 type_register_static(&qcrypto_tls_creds_psk_info);
304 }
305
306
307 type_init(qcrypto_tls_creds_psk_register_types);