qxl: check release info object
[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 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 "qom/object_interfaces.h"
26 #include "trace.h"
27
28
29 #ifdef CONFIG_GNUTLS
30
31 static int
32 lookup_key(const char *pskfile, const char *username, gnutls_datum_t *key,
33 Error **errp)
34 {
35 const size_t ulen = strlen(username);
36 GError *gerr = NULL;
37 char *content = NULL;
38 char **lines = NULL;
39 size_t clen = 0, i;
40 int ret = -1;
41
42 if (!g_file_get_contents(pskfile, &content, &clen, &gerr)) {
43 error_setg(errp, "Cannot read PSK file %s: %s",
44 pskfile, gerr->message);
45 g_error_free(gerr);
46 return -1;
47 }
48
49 lines = g_strsplit(content, "\n", -1);
50 for (i = 0; lines[i] != NULL; ++i) {
51 if (strncmp(lines[i], username, ulen) == 0 && lines[i][ulen] == ':') {
52 key->data = (unsigned char *) g_strdup(&lines[i][ulen + 1]);
53 key->size = strlen(lines[i]) - ulen - 1;
54 ret = 0;
55 goto out;
56 }
57 }
58 error_setg(errp, "Username %s not found in PSK file %s",
59 username, pskfile);
60
61 out:
62 free(content);
63 g_strfreev(lines);
64 return ret;
65 }
66
67 static int
68 qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds,
69 Error **errp)
70 {
71 char *pskfile = NULL, *dhparams = NULL;
72 const char *username;
73 int ret;
74 int rv = -1;
75 gnutls_datum_t key = { .data = NULL };
76
77 trace_qcrypto_tls_creds_psk_load(creds,
78 creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>");
79
80 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
81 if (creds->username) {
82 error_setg(errp, "username should not be set when endpoint=server");
83 goto cleanup;
84 }
85
86 if (qcrypto_tls_creds_get_path(&creds->parent_obj,
87 QCRYPTO_TLS_CREDS_DH_PARAMS,
88 false, &dhparams, errp) < 0 ||
89 qcrypto_tls_creds_get_path(&creds->parent_obj,
90 QCRYPTO_TLS_CREDS_PSKFILE,
91 true, &pskfile, errp) < 0) {
92 goto cleanup;
93 }
94
95 ret = gnutls_psk_allocate_server_credentials(&creds->data.server);
96 if (ret < 0) {
97 error_setg(errp, "Cannot allocate credentials: %s",
98 gnutls_strerror(ret));
99 goto cleanup;
100 }
101
102 if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams,
103 &creds->parent_obj.dh_params,
104 errp) < 0) {
105 goto cleanup;
106 }
107
108 gnutls_psk_set_server_credentials_file(creds->data.server, pskfile);
109 gnutls_psk_set_server_dh_params(creds->data.server,
110 creds->parent_obj.dh_params);
111 } else {
112 if (qcrypto_tls_creds_get_path(&creds->parent_obj,
113 QCRYPTO_TLS_CREDS_PSKFILE,
114 true, &pskfile, errp) < 0) {
115 goto cleanup;
116 }
117
118 if (creds->username) {
119 username = creds->username;
120 } else {
121 username = "qemu";
122 }
123 if (lookup_key(pskfile, username, &key, errp) != 0) {
124 goto cleanup;
125 }
126
127 ret = gnutls_psk_allocate_client_credentials(&creds->data.client);
128 if (ret < 0) {
129 error_setg(errp, "Cannot allocate credentials: %s",
130 gnutls_strerror(ret));
131 goto cleanup;
132 }
133
134 gnutls_psk_set_client_credentials(creds->data.client,
135 username, &key, GNUTLS_PSK_KEY_HEX);
136 }
137
138 rv = 0;
139 cleanup:
140 g_free(key.data);
141 g_free(pskfile);
142 g_free(dhparams);
143 return rv;
144 }
145
146
147 static void
148 qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds)
149 {
150 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
151 if (creds->data.client) {
152 gnutls_psk_free_client_credentials(creds->data.client);
153 creds->data.client = NULL;
154 }
155 } else {
156 if (creds->data.server) {
157 gnutls_psk_free_server_credentials(creds->data.server);
158 creds->data.server = NULL;
159 }
160 }
161 if (creds->parent_obj.dh_params) {
162 gnutls_dh_params_deinit(creds->parent_obj.dh_params);
163 creds->parent_obj.dh_params = NULL;
164 }
165 }
166
167 #else /* ! CONFIG_GNUTLS */
168
169
170 static void
171 qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED,
172 Error **errp)
173 {
174 error_setg(errp, "TLS credentials support requires GNUTLS");
175 }
176
177
178 static void
179 qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED)
180 {
181 /* nada */
182 }
183
184
185 #endif /* ! CONFIG_GNUTLS */
186
187
188 static void
189 qcrypto_tls_creds_psk_prop_set_loaded(Object *obj,
190 bool value,
191 Error **errp)
192 {
193 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
194
195 if (value) {
196 qcrypto_tls_creds_psk_load(creds, errp);
197 } else {
198 qcrypto_tls_creds_psk_unload(creds);
199 }
200 }
201
202
203 #ifdef CONFIG_GNUTLS
204
205
206 static bool
207 qcrypto_tls_creds_psk_prop_get_loaded(Object *obj,
208 Error **errp G_GNUC_UNUSED)
209 {
210 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
211
212 if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
213 return creds->data.server != NULL;
214 } else {
215 return creds->data.client != NULL;
216 }
217 }
218
219
220 #else /* ! CONFIG_GNUTLS */
221
222
223 static bool
224 qcrypto_tls_creds_psk_prop_get_loaded(Object *obj G_GNUC_UNUSED,
225 Error **errp G_GNUC_UNUSED)
226 {
227 return false;
228 }
229
230
231 #endif /* ! CONFIG_GNUTLS */
232
233
234 static void
235 qcrypto_tls_creds_psk_complete(UserCreatable *uc, Error **errp)
236 {
237 object_property_set_bool(OBJECT(uc), true, "loaded", errp);
238 }
239
240
241 static void
242 qcrypto_tls_creds_psk_finalize(Object *obj)
243 {
244 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
245
246 qcrypto_tls_creds_psk_unload(creds);
247 }
248
249 static void
250 qcrypto_tls_creds_psk_prop_set_username(Object *obj,
251 const char *value,
252 Error **errp G_GNUC_UNUSED)
253 {
254 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
255
256 creds->username = g_strdup(value);
257 }
258
259
260 static char *
261 qcrypto_tls_creds_psk_prop_get_username(Object *obj,
262 Error **errp G_GNUC_UNUSED)
263 {
264 QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj);
265
266 return g_strdup(creds->username);
267 }
268
269 static void
270 qcrypto_tls_creds_psk_class_init(ObjectClass *oc, void *data)
271 {
272 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
273
274 ucc->complete = qcrypto_tls_creds_psk_complete;
275
276 object_class_property_add_bool(oc, "loaded",
277 qcrypto_tls_creds_psk_prop_get_loaded,
278 qcrypto_tls_creds_psk_prop_set_loaded,
279 NULL);
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 NULL);
284 }
285
286
287 static const TypeInfo qcrypto_tls_creds_psk_info = {
288 .parent = TYPE_QCRYPTO_TLS_CREDS,
289 .name = TYPE_QCRYPTO_TLS_CREDS_PSK,
290 .instance_size = sizeof(QCryptoTLSCredsPSK),
291 .instance_finalize = qcrypto_tls_creds_psk_finalize,
292 .class_size = sizeof(QCryptoTLSCredsPSKClass),
293 .class_init = qcrypto_tls_creds_psk_class_init,
294 .interfaces = (InterfaceInfo[]) {
295 { TYPE_USER_CREATABLE },
296 { }
297 }
298 };
299
300
301 static void
302 qcrypto_tls_creds_psk_register_types(void)
303 {
304 type_register_static(&qcrypto_tls_creds_psk_info);
305 }
306
307
308 type_init(qcrypto_tls_creds_psk_register_types);