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e1a6dc91 RJ |
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" | |
0b8fa32f | 25 | #include "qemu/module.h" |
e1a6dc91 RJ |
26 | #include "qom/object_interfaces.h" |
27 | #include "trace.h" | |
28 | ||
29 | ||
30 | #ifdef CONFIG_GNUTLS | |
31 | ||
32 | static int | |
33 | lookup_key(const char *pskfile, const char *username, gnutls_datum_t *key, | |
34 | Error **errp) | |
35 | { | |
36 | const size_t ulen = strlen(username); | |
37 | GError *gerr = NULL; | |
38 | char *content = NULL; | |
39 | char **lines = NULL; | |
40 | size_t clen = 0, i; | |
41 | int ret = -1; | |
42 | ||
43 | if (!g_file_get_contents(pskfile, &content, &clen, &gerr)) { | |
44 | error_setg(errp, "Cannot read PSK file %s: %s", | |
45 | pskfile, gerr->message); | |
46 | g_error_free(gerr); | |
47 | return -1; | |
48 | } | |
49 | ||
50 | lines = g_strsplit(content, "\n", -1); | |
51 | for (i = 0; lines[i] != NULL; ++i) { | |
52 | if (strncmp(lines[i], username, ulen) == 0 && lines[i][ulen] == ':') { | |
53 | key->data = (unsigned char *) g_strdup(&lines[i][ulen + 1]); | |
54 | key->size = strlen(lines[i]) - ulen - 1; | |
55 | ret = 0; | |
56 | goto out; | |
57 | } | |
58 | } | |
59 | error_setg(errp, "Username %s not found in PSK file %s", | |
60 | username, pskfile); | |
61 | ||
62 | out: | |
63 | free(content); | |
64 | g_strfreev(lines); | |
65 | return ret; | |
66 | } | |
67 | ||
68 | static int | |
69 | qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds, | |
70 | Error **errp) | |
71 | { | |
72 | char *pskfile = NULL, *dhparams = NULL; | |
73 | const char *username; | |
74 | int ret; | |
75 | int rv = -1; | |
76 | gnutls_datum_t key = { .data = NULL }; | |
77 | ||
78 | trace_qcrypto_tls_creds_psk_load(creds, | |
79 | creds->parent_obj.dir ? creds->parent_obj.dir : "<nodir>"); | |
80 | ||
81 | if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
82 | if (creds->username) { | |
83 | error_setg(errp, "username should not be set when endpoint=server"); | |
84 | goto cleanup; | |
85 | } | |
86 | ||
87 | if (qcrypto_tls_creds_get_path(&creds->parent_obj, | |
88 | QCRYPTO_TLS_CREDS_DH_PARAMS, | |
89 | false, &dhparams, errp) < 0 || | |
90 | qcrypto_tls_creds_get_path(&creds->parent_obj, | |
91 | QCRYPTO_TLS_CREDS_PSKFILE, | |
92 | true, &pskfile, errp) < 0) { | |
93 | goto cleanup; | |
94 | } | |
95 | ||
96 | ret = gnutls_psk_allocate_server_credentials(&creds->data.server); | |
97 | if (ret < 0) { | |
98 | error_setg(errp, "Cannot allocate credentials: %s", | |
99 | gnutls_strerror(ret)); | |
100 | goto cleanup; | |
101 | } | |
102 | ||
103 | if (qcrypto_tls_creds_get_dh_params_file(&creds->parent_obj, dhparams, | |
104 | &creds->parent_obj.dh_params, | |
105 | errp) < 0) { | |
106 | goto cleanup; | |
107 | } | |
108 | ||
109 | gnutls_psk_set_server_credentials_file(creds->data.server, pskfile); | |
110 | gnutls_psk_set_server_dh_params(creds->data.server, | |
111 | creds->parent_obj.dh_params); | |
112 | } else { | |
113 | if (qcrypto_tls_creds_get_path(&creds->parent_obj, | |
114 | QCRYPTO_TLS_CREDS_PSKFILE, | |
115 | true, &pskfile, errp) < 0) { | |
116 | goto cleanup; | |
117 | } | |
118 | ||
119 | if (creds->username) { | |
120 | username = creds->username; | |
121 | } else { | |
122 | username = "qemu"; | |
123 | } | |
124 | if (lookup_key(pskfile, username, &key, errp) != 0) { | |
125 | goto cleanup; | |
126 | } | |
127 | ||
128 | ret = gnutls_psk_allocate_client_credentials(&creds->data.client); | |
129 | if (ret < 0) { | |
130 | error_setg(errp, "Cannot allocate credentials: %s", | |
131 | gnutls_strerror(ret)); | |
132 | goto cleanup; | |
133 | } | |
134 | ||
135 | gnutls_psk_set_client_credentials(creds->data.client, | |
136 | username, &key, GNUTLS_PSK_KEY_HEX); | |
137 | } | |
138 | ||
139 | rv = 0; | |
140 | cleanup: | |
141 | g_free(key.data); | |
142 | g_free(pskfile); | |
143 | g_free(dhparams); | |
144 | return rv; | |
145 | } | |
146 | ||
147 | ||
148 | static void | |
149 | qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds) | |
150 | { | |
151 | if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { | |
152 | if (creds->data.client) { | |
153 | gnutls_psk_free_client_credentials(creds->data.client); | |
154 | creds->data.client = NULL; | |
155 | } | |
156 | } else { | |
157 | if (creds->data.server) { | |
158 | gnutls_psk_free_server_credentials(creds->data.server); | |
159 | creds->data.server = NULL; | |
160 | } | |
161 | } | |
162 | if (creds->parent_obj.dh_params) { | |
163 | gnutls_dh_params_deinit(creds->parent_obj.dh_params); | |
164 | creds->parent_obj.dh_params = NULL; | |
165 | } | |
166 | } | |
167 | ||
168 | #else /* ! CONFIG_GNUTLS */ | |
169 | ||
170 | ||
171 | static void | |
172 | qcrypto_tls_creds_psk_load(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED, | |
173 | Error **errp) | |
174 | { | |
175 | error_setg(errp, "TLS credentials support requires GNUTLS"); | |
176 | } | |
177 | ||
178 | ||
179 | static void | |
180 | qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED) | |
181 | { | |
182 | /* nada */ | |
183 | } | |
184 | ||
185 | ||
186 | #endif /* ! CONFIG_GNUTLS */ | |
187 | ||
188 | ||
189 | static void | |
190 | qcrypto_tls_creds_psk_prop_set_loaded(Object *obj, | |
191 | bool value, | |
192 | Error **errp) | |
193 | { | |
194 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj); | |
195 | ||
196 | if (value) { | |
197 | qcrypto_tls_creds_psk_load(creds, errp); | |
198 | } else { | |
199 | qcrypto_tls_creds_psk_unload(creds); | |
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), true, "loaded", 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 | NULL); | |
281 | object_class_property_add_str(oc, "username", | |
282 | qcrypto_tls_creds_psk_prop_get_username, | |
283 | qcrypto_tls_creds_psk_prop_set_username, | |
284 | NULL); | |
285 | } | |
286 | ||
287 | ||
288 | static const TypeInfo qcrypto_tls_creds_psk_info = { | |
289 | .parent = TYPE_QCRYPTO_TLS_CREDS, | |
290 | .name = TYPE_QCRYPTO_TLS_CREDS_PSK, | |
291 | .instance_size = sizeof(QCryptoTLSCredsPSK), | |
292 | .instance_finalize = qcrypto_tls_creds_psk_finalize, | |
293 | .class_size = sizeof(QCryptoTLSCredsPSKClass), | |
294 | .class_init = qcrypto_tls_creds_psk_class_init, | |
295 | .interfaces = (InterfaceInfo[]) { | |
296 | { TYPE_USER_CREATABLE }, | |
297 | { } | |
298 | } | |
299 | }; | |
300 | ||
301 | ||
302 | static void | |
303 | qcrypto_tls_creds_psk_register_types(void) | |
304 | { | |
305 | type_register_static(&qcrypto_tls_creds_psk_info); | |
306 | } | |
307 | ||
308 | ||
309 | type_init(qcrypto_tls_creds_psk_register_types); |