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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
32static int
33lookup_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
68static int
69qcrypto_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
148static void
149qcrypto_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
169
170
171static void
172qcrypto_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
179static void
180qcrypto_tls_creds_psk_unload(QCryptoTLSCredsPSK *creds G_GNUC_UNUSED)
181{
182
183}
184
185
186#endif
187
188
189static void
190qcrypto_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
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), true, "loaded", 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 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
288static 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
302static void
303qcrypto_tls_creds_psk_register_types(void)
304{
305 type_register_static(&qcrypto_tls_creds_psk_info);
306}
307
308
309type_init(qcrypto_tls_creds_psk_register_types);
310
