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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
34static int
35lookup_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
70static int
71qcrypto_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
149static void
150qcrypto_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
170
171
172static void
173qcrypto_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
180static void
181qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED)
182{
183
184}
185
186
187#endif
188
189
190static void
191qcrypto_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
207static bool
208qcrypto_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
222
223
224static bool
225qcrypto_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
233
234
235static void
236qcrypto_tls_creds_psk_complete(UserCreatable *uc, Error **errp)
237{
238 object_property_set_bool(OBJECT(uc), "loaded", true, errp);
239}
240
241
242static void
243qcrypto_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
250static void
251qcrypto_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
261static char *
262qcrypto_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
270static void
271qcrypto_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
286static 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
300static void
301qcrypto_tls_creds_psk_register_types(void)
302{
303 type_register_static(&qcrypto_tls_creds_psk_info);
304}
305
306
307type_init(qcrypto_tls_creds_psk_register_types);
308
