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ed8ee42c DB |
1 | /* |
2 | * QEMU I/O channels TLS driver | |
3 | * | |
4 | * Copyright (c) 2015 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 | ||
cae9fc56 | 21 | #include "qemu/osdep.h" |
da34e65c | 22 | #include "qapi/error.h" |
ed8ee42c DB |
23 | #include "io/channel-tls.h" |
24 | #include "trace.h" | |
25 | ||
26 | ||
27 | static ssize_t qio_channel_tls_write_handler(const char *buf, | |
28 | size_t len, | |
29 | void *opaque) | |
30 | { | |
31 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque); | |
32 | ssize_t ret; | |
33 | ||
34 | ret = qio_channel_write(tioc->master, buf, len, NULL); | |
35 | if (ret == QIO_CHANNEL_ERR_BLOCK) { | |
36 | errno = EAGAIN; | |
37 | return -1; | |
38 | } else if (ret < 0) { | |
39 | errno = EIO; | |
40 | return -1; | |
41 | } | |
42 | return ret; | |
43 | } | |
44 | ||
45 | static ssize_t qio_channel_tls_read_handler(char *buf, | |
46 | size_t len, | |
47 | void *opaque) | |
48 | { | |
49 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque); | |
50 | ssize_t ret; | |
51 | ||
52 | ret = qio_channel_read(tioc->master, buf, len, NULL); | |
53 | if (ret == QIO_CHANNEL_ERR_BLOCK) { | |
54 | errno = EAGAIN; | |
55 | return -1; | |
56 | } else if (ret < 0) { | |
57 | errno = EIO; | |
58 | return -1; | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | ||
63 | ||
64 | QIOChannelTLS * | |
65 | qio_channel_tls_new_server(QIOChannel *master, | |
66 | QCryptoTLSCreds *creds, | |
67 | const char *aclname, | |
68 | Error **errp) | |
69 | { | |
70 | QIOChannelTLS *ioc; | |
71 | ||
72 | ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS)); | |
73 | ||
74 | ioc->master = master; | |
75 | object_ref(OBJECT(master)); | |
76 | ||
77 | ioc->session = qcrypto_tls_session_new( | |
78 | creds, | |
79 | NULL, | |
80 | aclname, | |
81 | QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, | |
82 | errp); | |
83 | if (!ioc->session) { | |
84 | goto error; | |
85 | } | |
86 | ||
87 | qcrypto_tls_session_set_callbacks( | |
88 | ioc->session, | |
89 | qio_channel_tls_write_handler, | |
90 | qio_channel_tls_read_handler, | |
91 | ioc); | |
92 | ||
93 | trace_qio_channel_tls_new_server(ioc, master, creds, aclname); | |
94 | return ioc; | |
95 | ||
96 | error: | |
97 | object_unref(OBJECT(ioc)); | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | QIOChannelTLS * | |
102 | qio_channel_tls_new_client(QIOChannel *master, | |
103 | QCryptoTLSCreds *creds, | |
104 | const char *hostname, | |
105 | Error **errp) | |
106 | { | |
107 | QIOChannelTLS *tioc; | |
108 | QIOChannel *ioc; | |
109 | ||
110 | tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS)); | |
111 | ioc = QIO_CHANNEL(tioc); | |
112 | ||
113 | tioc->master = master; | |
114 | if (master->features & (1 << QIO_CHANNEL_FEATURE_SHUTDOWN)) { | |
115 | ioc->features |= (1 << QIO_CHANNEL_FEATURE_SHUTDOWN); | |
116 | } | |
117 | object_ref(OBJECT(master)); | |
118 | ||
119 | tioc->session = qcrypto_tls_session_new( | |
120 | creds, | |
121 | hostname, | |
122 | NULL, | |
123 | QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, | |
124 | errp); | |
125 | if (!tioc->session) { | |
126 | goto error; | |
127 | } | |
128 | ||
129 | qcrypto_tls_session_set_callbacks( | |
130 | tioc->session, | |
131 | qio_channel_tls_write_handler, | |
132 | qio_channel_tls_read_handler, | |
133 | tioc); | |
134 | ||
135 | trace_qio_channel_tls_new_client(tioc, master, creds, hostname); | |
136 | return tioc; | |
137 | ||
138 | error: | |
139 | object_unref(OBJECT(tioc)); | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | ||
144 | static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc, | |
145 | GIOCondition condition, | |
146 | gpointer user_data); | |
147 | ||
148 | static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc, | |
149 | QIOTask *task) | |
150 | { | |
151 | Error *err = NULL; | |
152 | QCryptoTLSSessionHandshakeStatus status; | |
153 | ||
154 | if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) { | |
155 | trace_qio_channel_tls_handshake_fail(ioc); | |
156 | qio_task_abort(task, err); | |
157 | goto cleanup; | |
158 | } | |
159 | ||
160 | status = qcrypto_tls_session_get_handshake_status(ioc->session); | |
161 | if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) { | |
162 | trace_qio_channel_tls_handshake_complete(ioc); | |
163 | if (qcrypto_tls_session_check_credentials(ioc->session, | |
164 | &err) < 0) { | |
165 | trace_qio_channel_tls_credentials_deny(ioc); | |
166 | qio_task_abort(task, err); | |
167 | goto cleanup; | |
168 | } | |
169 | trace_qio_channel_tls_credentials_allow(ioc); | |
170 | qio_task_complete(task); | |
171 | } else { | |
172 | GIOCondition condition; | |
173 | if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) { | |
174 | condition = G_IO_OUT; | |
175 | } else { | |
176 | condition = G_IO_IN; | |
177 | } | |
178 | ||
179 | trace_qio_channel_tls_handshake_pending(ioc, status); | |
180 | qio_channel_add_watch(ioc->master, | |
181 | condition, | |
182 | qio_channel_tls_handshake_io, | |
183 | task, | |
184 | NULL); | |
185 | } | |
186 | ||
187 | cleanup: | |
188 | error_free(err); | |
189 | } | |
190 | ||
191 | ||
192 | static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc, | |
193 | GIOCondition condition, | |
194 | gpointer user_data) | |
195 | { | |
196 | QIOTask *task = user_data; | |
197 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS( | |
198 | qio_task_get_source(task)); | |
199 | ||
200 | qio_channel_tls_handshake_task( | |
201 | tioc, task); | |
202 | ||
203 | object_unref(OBJECT(tioc)); | |
204 | ||
205 | return FALSE; | |
206 | } | |
207 | ||
208 | void qio_channel_tls_handshake(QIOChannelTLS *ioc, | |
209 | QIOTaskFunc func, | |
210 | gpointer opaque, | |
211 | GDestroyNotify destroy) | |
212 | { | |
213 | QIOTask *task; | |
214 | ||
215 | task = qio_task_new(OBJECT(ioc), | |
216 | func, opaque, destroy); | |
217 | ||
218 | trace_qio_channel_tls_handshake_start(ioc); | |
219 | qio_channel_tls_handshake_task(ioc, task); | |
220 | } | |
221 | ||
222 | ||
223 | static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED) | |
224 | { | |
225 | } | |
226 | ||
227 | ||
228 | static void qio_channel_tls_finalize(Object *obj) | |
229 | { | |
230 | QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj); | |
231 | ||
232 | object_unref(OBJECT(ioc->master)); | |
233 | qcrypto_tls_session_free(ioc->session); | |
234 | } | |
235 | ||
236 | ||
237 | static ssize_t qio_channel_tls_readv(QIOChannel *ioc, | |
238 | const struct iovec *iov, | |
239 | size_t niov, | |
240 | int **fds, | |
241 | size_t *nfds, | |
242 | Error **errp) | |
243 | { | |
244 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
245 | size_t i; | |
246 | ssize_t got = 0; | |
247 | ||
248 | for (i = 0 ; i < niov ; i++) { | |
249 | ssize_t ret = qcrypto_tls_session_read(tioc->session, | |
250 | iov[i].iov_base, | |
251 | iov[i].iov_len); | |
252 | if (ret < 0) { | |
253 | if (errno == EAGAIN) { | |
254 | if (got) { | |
255 | return got; | |
256 | } else { | |
257 | return QIO_CHANNEL_ERR_BLOCK; | |
258 | } | |
259 | } | |
260 | ||
261 | error_setg_errno(errp, errno, | |
262 | "Cannot read from TLS channel"); | |
263 | return -1; | |
264 | } | |
265 | got += ret; | |
266 | if (ret < iov[i].iov_len) { | |
267 | break; | |
268 | } | |
269 | } | |
270 | return got; | |
271 | } | |
272 | ||
273 | ||
274 | static ssize_t qio_channel_tls_writev(QIOChannel *ioc, | |
275 | const struct iovec *iov, | |
276 | size_t niov, | |
277 | int *fds, | |
278 | size_t nfds, | |
279 | Error **errp) | |
280 | { | |
281 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
282 | size_t i; | |
283 | ssize_t done = 0; | |
284 | ||
285 | for (i = 0 ; i < niov ; i++) { | |
286 | ssize_t ret = qcrypto_tls_session_write(tioc->session, | |
287 | iov[i].iov_base, | |
288 | iov[i].iov_len); | |
289 | if (ret <= 0) { | |
290 | if (errno == EAGAIN) { | |
291 | if (done) { | |
292 | return done; | |
293 | } else { | |
294 | return QIO_CHANNEL_ERR_BLOCK; | |
295 | } | |
296 | } | |
297 | ||
298 | error_setg_errno(errp, errno, | |
299 | "Cannot write to TLS channel"); | |
300 | return -1; | |
301 | } | |
302 | done += ret; | |
303 | if (ret < iov[i].iov_len) { | |
304 | break; | |
305 | } | |
306 | } | |
307 | return done; | |
308 | } | |
309 | ||
310 | static int qio_channel_tls_set_blocking(QIOChannel *ioc, | |
311 | bool enabled, | |
312 | Error **errp) | |
313 | { | |
314 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
315 | ||
316 | return qio_channel_set_blocking(tioc->master, enabled, errp); | |
317 | } | |
318 | ||
319 | static void qio_channel_tls_set_delay(QIOChannel *ioc, | |
320 | bool enabled) | |
321 | { | |
322 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
323 | ||
324 | qio_channel_set_delay(tioc->master, enabled); | |
325 | } | |
326 | ||
327 | static void qio_channel_tls_set_cork(QIOChannel *ioc, | |
328 | bool enabled) | |
329 | { | |
330 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
331 | ||
332 | qio_channel_set_cork(tioc->master, enabled); | |
333 | } | |
334 | ||
335 | static int qio_channel_tls_shutdown(QIOChannel *ioc, | |
336 | QIOChannelShutdown how, | |
337 | Error **errp) | |
338 | { | |
339 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
340 | ||
341 | return qio_channel_shutdown(tioc->master, how, errp); | |
342 | } | |
343 | ||
344 | static int qio_channel_tls_close(QIOChannel *ioc, | |
345 | Error **errp) | |
346 | { | |
347 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
348 | ||
349 | return qio_channel_close(tioc->master, errp); | |
350 | } | |
351 | ||
352 | static GSource *qio_channel_tls_create_watch(QIOChannel *ioc, | |
353 | GIOCondition condition) | |
354 | { | |
355 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
356 | ||
357 | return qio_channel_create_watch(tioc->master, condition); | |
358 | } | |
359 | ||
360 | QCryptoTLSSession * | |
361 | qio_channel_tls_get_session(QIOChannelTLS *ioc) | |
362 | { | |
363 | return ioc->session; | |
364 | } | |
365 | ||
366 | static void qio_channel_tls_class_init(ObjectClass *klass, | |
367 | void *class_data G_GNUC_UNUSED) | |
368 | { | |
369 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
370 | ||
371 | ioc_klass->io_writev = qio_channel_tls_writev; | |
372 | ioc_klass->io_readv = qio_channel_tls_readv; | |
373 | ioc_klass->io_set_blocking = qio_channel_tls_set_blocking; | |
374 | ioc_klass->io_set_delay = qio_channel_tls_set_delay; | |
375 | ioc_klass->io_set_cork = qio_channel_tls_set_cork; | |
376 | ioc_klass->io_close = qio_channel_tls_close; | |
377 | ioc_klass->io_shutdown = qio_channel_tls_shutdown; | |
378 | ioc_klass->io_create_watch = qio_channel_tls_create_watch; | |
379 | } | |
380 | ||
381 | static const TypeInfo qio_channel_tls_info = { | |
382 | .parent = TYPE_QIO_CHANNEL, | |
383 | .name = TYPE_QIO_CHANNEL_TLS, | |
384 | .instance_size = sizeof(QIOChannelTLS), | |
385 | .instance_init = qio_channel_tls_init, | |
386 | .instance_finalize = qio_channel_tls_finalize, | |
387 | .class_init = qio_channel_tls_class_init, | |
388 | }; | |
389 | ||
390 | static void qio_channel_tls_register_types(void) | |
391 | { | |
392 | type_register_static(&qio_channel_tls_info); | |
393 | } | |
394 | ||
395 | type_init(qio_channel_tls_register_types); |