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 2.1 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 "qapi/error.h"
23 #include "qemu/module.h"
24 #include "io/channel-tls.h"
25 #include "trace.h"
26 #include "qemu/atomic.h"
27
28
qio_channel_tls_write_handler(const char * buf,size_t len,void * opaque,Error ** errp)29 static ssize_t qio_channel_tls_write_handler(const char *buf,
30 size_t len,
31 void *opaque,
32 Error **errp)
33 {
34 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
35 ssize_t ret;
36
37 ret = qio_channel_write(tioc->master, buf, len, errp);
38 if (ret == QIO_CHANNEL_ERR_BLOCK) {
39 return QCRYPTO_TLS_SESSION_ERR_BLOCK;
40 } else if (ret < 0) {
41 return -1;
42 }
43 return ret;
44 }
45
qio_channel_tls_read_handler(char * buf,size_t len,void * opaque,Error ** errp)46 static ssize_t qio_channel_tls_read_handler(char *buf,
47 size_t len,
48 void *opaque,
49 Error **errp)
50 {
51 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
52 ssize_t ret;
53
54 ret = qio_channel_read(tioc->master, buf, len, errp);
55 if (ret == QIO_CHANNEL_ERR_BLOCK) {
56 return QCRYPTO_TLS_SESSION_ERR_BLOCK;
57 } else if (ret < 0) {
58 return -1;
59 }
60 return ret;
61 }
62
63
64 QIOChannelTLS *
qio_channel_tls_new_server(QIOChannel * master,QCryptoTLSCreds * creds,const char * aclname,Error ** errp)65 qio_channel_tls_new_server(QIOChannel *master,
66 QCryptoTLSCreds *creds,
67 const char *aclname,
68 Error **errp)
69 {
70 QIOChannelTLS *tioc;
71 QIOChannel *ioc;
72
73 tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
74 ioc = QIO_CHANNEL(tioc);
75
76 tioc->master = master;
77 ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
78 if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
79 qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
80 }
81 object_ref(OBJECT(master));
82
83 tioc->session = qcrypto_tls_session_new(
84 creds,
85 NULL,
86 aclname,
87 QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
88 errp);
89 if (!tioc->session) {
90 goto error;
91 }
92
93 qcrypto_tls_session_set_callbacks(
94 tioc->session,
95 qio_channel_tls_write_handler,
96 qio_channel_tls_read_handler,
97 tioc);
98
99 trace_qio_channel_tls_new_server(tioc, master, creds, aclname);
100 return tioc;
101
102 error:
103 object_unref(OBJECT(tioc));
104 return NULL;
105 }
106
107 QIOChannelTLS *
qio_channel_tls_new_client(QIOChannel * master,QCryptoTLSCreds * creds,const char * hostname,Error ** errp)108 qio_channel_tls_new_client(QIOChannel *master,
109 QCryptoTLSCreds *creds,
110 const char *hostname,
111 Error **errp)
112 {
113 QIOChannelTLS *tioc;
114 QIOChannel *ioc;
115
116 tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
117 ioc = QIO_CHANNEL(tioc);
118
119 tioc->master = master;
120 ioc->follow_coroutine_ctx = master->follow_coroutine_ctx;
121 if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
122 qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
123 }
124 object_ref(OBJECT(master));
125
126 tioc->session = qcrypto_tls_session_new(
127 creds,
128 hostname,
129 NULL,
130 QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
131 errp);
132 if (!tioc->session) {
133 goto error;
134 }
135
136 qcrypto_tls_session_set_callbacks(
137 tioc->session,
138 qio_channel_tls_write_handler,
139 qio_channel_tls_read_handler,
140 tioc);
141
142 trace_qio_channel_tls_new_client(tioc, master, creds, hostname);
143 return tioc;
144
145 error:
146 object_unref(OBJECT(tioc));
147 return NULL;
148 }
149
150 struct QIOChannelTLSData {
151 QIOTask *task;
152 GMainContext *context;
153 };
154 typedef struct QIOChannelTLSData QIOChannelTLSData;
155
156 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
157 GIOCondition condition,
158 gpointer user_data);
159
qio_channel_tls_handshake_task(QIOChannelTLS * ioc,QIOTask * task,GMainContext * context)160 static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc,
161 QIOTask *task,
162 GMainContext *context)
163 {
164 Error *err = NULL;
165 QCryptoTLSSessionHandshakeStatus status;
166
167 if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) {
168 trace_qio_channel_tls_handshake_fail(ioc);
169 qio_task_set_error(task, err);
170 qio_task_complete(task);
171 return;
172 }
173
174 status = qcrypto_tls_session_get_handshake_status(ioc->session);
175 if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
176 trace_qio_channel_tls_handshake_complete(ioc);
177 if (qcrypto_tls_session_check_credentials(ioc->session,
178 &err) < 0) {
179 trace_qio_channel_tls_credentials_deny(ioc);
180 qio_task_set_error(task, err);
181 } else {
182 trace_qio_channel_tls_credentials_allow(ioc);
183 }
184 qio_task_complete(task);
185 } else {
186 GIOCondition condition;
187 QIOChannelTLSData *data = g_new0(typeof(*data), 1);
188
189 data->task = task;
190 data->context = context;
191
192 if (context) {
193 g_main_context_ref(context);
194 }
195
196 if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) {
197 condition = G_IO_OUT;
198 } else {
199 condition = G_IO_IN;
200 }
201
202 trace_qio_channel_tls_handshake_pending(ioc, status);
203 ioc->hs_ioc_tag =
204 qio_channel_add_watch_full(ioc->master,
205 condition,
206 qio_channel_tls_handshake_io,
207 data,
208 NULL,
209 context);
210 }
211 }
212
213
qio_channel_tls_handshake_io(QIOChannel * ioc,GIOCondition condition,gpointer user_data)214 static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
215 GIOCondition condition,
216 gpointer user_data)
217 {
218 QIOChannelTLSData *data = user_data;
219 QIOTask *task = data->task;
220 GMainContext *context = data->context;
221 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
222 qio_task_get_source(task));
223
224 tioc->hs_ioc_tag = 0;
225 g_free(data);
226 qio_channel_tls_handshake_task(tioc, task, context);
227
228 if (context) {
229 g_main_context_unref(context);
230 }
231
232 return FALSE;
233 }
234
qio_channel_tls_handshake(QIOChannelTLS * ioc,QIOTaskFunc func,gpointer opaque,GDestroyNotify destroy,GMainContext * context)235 void qio_channel_tls_handshake(QIOChannelTLS *ioc,
236 QIOTaskFunc func,
237 gpointer opaque,
238 GDestroyNotify destroy,
239 GMainContext *context)
240 {
241 QIOTask *task;
242
243 task = qio_task_new(OBJECT(ioc),
244 func, opaque, destroy);
245
246 trace_qio_channel_tls_handshake_start(ioc);
247 qio_channel_tls_handshake_task(ioc, task, context);
248 }
249
250
qio_channel_tls_init(Object * obj G_GNUC_UNUSED)251 static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
252 {
253 }
254
255
qio_channel_tls_finalize(Object * obj)256 static void qio_channel_tls_finalize(Object *obj)
257 {
258 QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
259
260 object_unref(OBJECT(ioc->master));
261 qcrypto_tls_session_free(ioc->session);
262 }
263
264
qio_channel_tls_readv(QIOChannel * ioc,const struct iovec * iov,size_t niov,int ** fds,size_t * nfds,int flags,Error ** errp)265 static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
266 const struct iovec *iov,
267 size_t niov,
268 int **fds,
269 size_t *nfds,
270 int flags,
271 Error **errp)
272 {
273 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
274 size_t i;
275 ssize_t got = 0;
276
277 for (i = 0 ; i < niov ; i++) {
278 ssize_t ret = qcrypto_tls_session_read(
279 tioc->session,
280 iov[i].iov_base,
281 iov[i].iov_len,
282 qatomic_load_acquire(&tioc->shutdown) & QIO_CHANNEL_SHUTDOWN_READ,
283 errp);
284 if (ret == QCRYPTO_TLS_SESSION_ERR_BLOCK) {
285 if (got) {
286 return got;
287 } else {
288 return QIO_CHANNEL_ERR_BLOCK;
289 }
290 } else if (ret < 0) {
291 return -1;
292 }
293 got += ret;
294 if (ret < iov[i].iov_len) {
295 break;
296 }
297 }
298 return got;
299 }
300
301
qio_channel_tls_writev(QIOChannel * ioc,const struct iovec * iov,size_t niov,int * fds,size_t nfds,int flags,Error ** errp)302 static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
303 const struct iovec *iov,
304 size_t niov,
305 int *fds,
306 size_t nfds,
307 int flags,
308 Error **errp)
309 {
310 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
311 size_t i;
312 ssize_t done = 0;
313
314 for (i = 0 ; i < niov ; i++) {
315 ssize_t ret = qcrypto_tls_session_write(tioc->session,
316 iov[i].iov_base,
317 iov[i].iov_len,
318 errp);
319 if (ret == QCRYPTO_TLS_SESSION_ERR_BLOCK) {
320 if (done) {
321 return done;
322 } else {
323 return QIO_CHANNEL_ERR_BLOCK;
324 }
325 } else if (ret < 0) {
326 return -1;
327 }
328 done += ret;
329 if (ret < iov[i].iov_len) {
330 break;
331 }
332 }
333 return done;
334 }
335
qio_channel_tls_set_blocking(QIOChannel * ioc,bool enabled,Error ** errp)336 static int qio_channel_tls_set_blocking(QIOChannel *ioc,
337 bool enabled,
338 Error **errp)
339 {
340 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
341
342 return qio_channel_set_blocking(tioc->master, enabled, errp);
343 }
344
qio_channel_tls_set_delay(QIOChannel * ioc,bool enabled)345 static void qio_channel_tls_set_delay(QIOChannel *ioc,
346 bool enabled)
347 {
348 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
349
350 qio_channel_set_delay(tioc->master, enabled);
351 }
352
qio_channel_tls_set_cork(QIOChannel * ioc,bool enabled)353 static void qio_channel_tls_set_cork(QIOChannel *ioc,
354 bool enabled)
355 {
356 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
357
358 qio_channel_set_cork(tioc->master, enabled);
359 }
360
qio_channel_tls_shutdown(QIOChannel * ioc,QIOChannelShutdown how,Error ** errp)361 static int qio_channel_tls_shutdown(QIOChannel *ioc,
362 QIOChannelShutdown how,
363 Error **errp)
364 {
365 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
366
367 qatomic_or(&tioc->shutdown, how);
368
369 return qio_channel_shutdown(tioc->master, how, errp);
370 }
371
qio_channel_tls_close(QIOChannel * ioc,Error ** errp)372 static int qio_channel_tls_close(QIOChannel *ioc,
373 Error **errp)
374 {
375 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
376
377 if (tioc->hs_ioc_tag) {
378 trace_qio_channel_tls_handshake_cancel(ioc);
379 g_clear_handle_id(&tioc->hs_ioc_tag, g_source_remove);
380 }
381
382 return qio_channel_close(tioc->master, errp);
383 }
384
qio_channel_tls_set_aio_fd_handler(QIOChannel * ioc,AioContext * read_ctx,IOHandler * io_read,AioContext * write_ctx,IOHandler * io_write,void * opaque)385 static void qio_channel_tls_set_aio_fd_handler(QIOChannel *ioc,
386 AioContext *read_ctx,
387 IOHandler *io_read,
388 AioContext *write_ctx,
389 IOHandler *io_write,
390 void *opaque)
391 {
392 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
393
394 qio_channel_set_aio_fd_handler(tioc->master, read_ctx, io_read,
395 write_ctx, io_write, opaque);
396 }
397
398 typedef struct QIOChannelTLSSource QIOChannelTLSSource;
399 struct QIOChannelTLSSource {
400 GSource parent;
401 QIOChannelTLS *tioc;
402 };
403
404 static gboolean
qio_channel_tls_source_check(GSource * source)405 qio_channel_tls_source_check(GSource *source)
406 {
407 QIOChannelTLSSource *tsource = (QIOChannelTLSSource *)source;
408
409 return qcrypto_tls_session_check_pending(tsource->tioc->session) > 0;
410 }
411
412 static gboolean
qio_channel_tls_source_prepare(GSource * source,gint * timeout)413 qio_channel_tls_source_prepare(GSource *source, gint *timeout)
414 {
415 *timeout = -1;
416 return qio_channel_tls_source_check(source);
417 }
418
419 static gboolean
qio_channel_tls_source_dispatch(GSource * source,GSourceFunc callback,gpointer user_data)420 qio_channel_tls_source_dispatch(GSource *source, GSourceFunc callback,
421 gpointer user_data)
422 {
423 return G_SOURCE_CONTINUE;
424 }
425
426 static void
qio_channel_tls_source_finalize(GSource * source)427 qio_channel_tls_source_finalize(GSource *source)
428 {
429 QIOChannelTLSSource *tsource = (QIOChannelTLSSource *)source;
430
431 object_unref(OBJECT(tsource->tioc));
432 }
433
434 static GSourceFuncs qio_channel_tls_source_funcs = {
435 qio_channel_tls_source_prepare,
436 qio_channel_tls_source_check,
437 qio_channel_tls_source_dispatch,
438 qio_channel_tls_source_finalize
439 };
440
441 static void
qio_channel_tls_read_watch(QIOChannelTLS * tioc,GSource * source)442 qio_channel_tls_read_watch(QIOChannelTLS *tioc, GSource *source)
443 {
444 GSource *child;
445 QIOChannelTLSSource *tlssource;
446
447 child = g_source_new(&qio_channel_tls_source_funcs,
448 sizeof(QIOChannelTLSSource));
449 tlssource = (QIOChannelTLSSource *)child;
450
451 tlssource->tioc = tioc;
452 object_ref(OBJECT(tioc));
453
454 g_source_add_child_source(source, child);
455 g_source_unref(child);
456 }
457
qio_channel_tls_create_watch(QIOChannel * ioc,GIOCondition condition)458 static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
459 GIOCondition condition)
460 {
461 QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
462 GSource *source = qio_channel_create_watch(tioc->master, condition);
463
464 if (condition & G_IO_IN) {
465 qio_channel_tls_read_watch(tioc, source);
466 }
467
468 return source;
469 }
470
471 QCryptoTLSSession *
qio_channel_tls_get_session(QIOChannelTLS * ioc)472 qio_channel_tls_get_session(QIOChannelTLS *ioc)
473 {
474 return ioc->session;
475 }
476
qio_channel_tls_class_init(ObjectClass * klass,void * class_data G_GNUC_UNUSED)477 static void qio_channel_tls_class_init(ObjectClass *klass,
478 void *class_data G_GNUC_UNUSED)
479 {
480 QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
481
482 ioc_klass->io_writev = qio_channel_tls_writev;
483 ioc_klass->io_readv = qio_channel_tls_readv;
484 ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
485 ioc_klass->io_set_delay = qio_channel_tls_set_delay;
486 ioc_klass->io_set_cork = qio_channel_tls_set_cork;
487 ioc_klass->io_close = qio_channel_tls_close;
488 ioc_klass->io_shutdown = qio_channel_tls_shutdown;
489 ioc_klass->io_create_watch = qio_channel_tls_create_watch;
490 ioc_klass->io_set_aio_fd_handler = qio_channel_tls_set_aio_fd_handler;
491 }
492
493 static const TypeInfo qio_channel_tls_info = {
494 .parent = TYPE_QIO_CHANNEL,
495 .name = TYPE_QIO_CHANNEL_TLS,
496 .instance_size = sizeof(QIOChannelTLS),
497 .instance_init = qio_channel_tls_init,
498 .instance_finalize = qio_channel_tls_finalize,
499 .class_init = qio_channel_tls_class_init,
500 };
501
qio_channel_tls_register_types(void)502 static void qio_channel_tls_register_types(void)
503 {
504 type_register_static(&qio_channel_tls_info);
505 }
506
507 type_init(qio_channel_tls_register_types);
508