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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 | |
b7cbb874 | 9 | * version 2.1 of the License, or (at your option) any later version. |
e1a6dc91 RJ |
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 | ||
678bcc3c PMD |
32 | #include <gnutls/gnutls.h> |
33 | ||
e1a6dc91 RJ |
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 | { | |
57b9f113 DB |
74 | g_autofree char *pskfile = NULL; |
75 | g_autofree char *dhparams = NULL; | |
e1a6dc91 RJ |
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); | |
e1a6dc91 RJ |
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 | |
0310641c | 191 | qcrypto_tls_creds_psk_complete(UserCreatable *uc, Error **errp) |
e1a6dc91 | 192 | { |
0310641c | 193 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(uc); |
e1a6dc91 | 194 | |
0310641c | 195 | qcrypto_tls_creds_psk_load(creds, errp); |
e1a6dc91 RJ |
196 | } |
197 | ||
198 | ||
199 | #ifdef CONFIG_GNUTLS | |
200 | ||
201 | ||
202 | static bool | |
203 | qcrypto_tls_creds_psk_prop_get_loaded(Object *obj, | |
204 | Error **errp G_GNUC_UNUSED) | |
205 | { | |
206 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj); | |
207 | ||
208 | if (creds->parent_obj.endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
209 | return creds->data.server != NULL; | |
210 | } else { | |
211 | return creds->data.client != NULL; | |
212 | } | |
213 | } | |
214 | ||
215 | ||
216 | #else /* ! CONFIG_GNUTLS */ | |
217 | ||
218 | ||
219 | static bool | |
220 | qcrypto_tls_creds_psk_prop_get_loaded(Object *obj G_GNUC_UNUSED, | |
221 | Error **errp G_GNUC_UNUSED) | |
222 | { | |
223 | return false; | |
224 | } | |
225 | ||
226 | ||
227 | #endif /* ! CONFIG_GNUTLS */ | |
228 | ||
229 | ||
e1a6dc91 RJ |
230 | static void |
231 | qcrypto_tls_creds_psk_finalize(Object *obj) | |
232 | { | |
233 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj); | |
234 | ||
235 | qcrypto_tls_creds_psk_unload(creds); | |
236 | } | |
237 | ||
238 | static void | |
239 | qcrypto_tls_creds_psk_prop_set_username(Object *obj, | |
240 | const char *value, | |
241 | Error **errp G_GNUC_UNUSED) | |
242 | { | |
243 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj); | |
244 | ||
245 | creds->username = g_strdup(value); | |
246 | } | |
247 | ||
248 | ||
249 | static char * | |
250 | qcrypto_tls_creds_psk_prop_get_username(Object *obj, | |
251 | Error **errp G_GNUC_UNUSED) | |
252 | { | |
253 | QCryptoTLSCredsPSK *creds = QCRYPTO_TLS_CREDS_PSK(obj); | |
254 | ||
255 | return g_strdup(creds->username); | |
256 | } | |
257 | ||
258 | static void | |
259 | qcrypto_tls_creds_psk_class_init(ObjectClass *oc, void *data) | |
260 | { | |
261 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); | |
262 | ||
263 | ucc->complete = qcrypto_tls_creds_psk_complete; | |
264 | ||
265 | object_class_property_add_bool(oc, "loaded", | |
266 | qcrypto_tls_creds_psk_prop_get_loaded, | |
0310641c | 267 | NULL); |
e1a6dc91 RJ |
268 | object_class_property_add_str(oc, "username", |
269 | qcrypto_tls_creds_psk_prop_get_username, | |
d2623129 | 270 | qcrypto_tls_creds_psk_prop_set_username); |
e1a6dc91 RJ |
271 | } |
272 | ||
273 | ||
274 | static const TypeInfo qcrypto_tls_creds_psk_info = { | |
275 | .parent = TYPE_QCRYPTO_TLS_CREDS, | |
276 | .name = TYPE_QCRYPTO_TLS_CREDS_PSK, | |
277 | .instance_size = sizeof(QCryptoTLSCredsPSK), | |
278 | .instance_finalize = qcrypto_tls_creds_psk_finalize, | |
279 | .class_size = sizeof(QCryptoTLSCredsPSKClass), | |
280 | .class_init = qcrypto_tls_creds_psk_class_init, | |
281 | .interfaces = (InterfaceInfo[]) { | |
282 | { TYPE_USER_CREATABLE }, | |
283 | { } | |
284 | } | |
285 | }; | |
286 | ||
287 | ||
288 | static void | |
289 | qcrypto_tls_creds_psk_register_types(void) | |
290 | { | |
291 | type_register_static(&qcrypto_tls_creds_psk_info); | |
292 | } | |
293 | ||
294 | ||
295 | type_init(qcrypto_tls_creds_psk_register_types); |