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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 | |
c8198bd5 | 9 | * version 2.1 of the License, or (at your option) any later version. |
ed8ee42c DB |
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" |
0b8fa32f | 23 | #include "qemu/module.h" |
ed8ee42c DB |
24 | #include "io/channel-tls.h" |
25 | #include "trace.h" | |
e4d2bfb1 | 26 | #include "qemu/atomic.h" |
ed8ee42c DB |
27 | |
28 | ||
29 | static ssize_t qio_channel_tls_write_handler(const char *buf, | |
30 | size_t len, | |
31 | void *opaque) | |
32 | { | |
33 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque); | |
34 | ssize_t ret; | |
35 | ||
36 | ret = qio_channel_write(tioc->master, buf, len, NULL); | |
37 | if (ret == QIO_CHANNEL_ERR_BLOCK) { | |
38 | errno = EAGAIN; | |
39 | return -1; | |
40 | } else if (ret < 0) { | |
41 | errno = EIO; | |
42 | return -1; | |
43 | } | |
44 | return ret; | |
45 | } | |
46 | ||
47 | static ssize_t qio_channel_tls_read_handler(char *buf, | |
48 | size_t len, | |
49 | void *opaque) | |
50 | { | |
51 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque); | |
52 | ssize_t ret; | |
53 | ||
54 | ret = qio_channel_read(tioc->master, buf, len, NULL); | |
55 | if (ret == QIO_CHANNEL_ERR_BLOCK) { | |
56 | errno = EAGAIN; | |
57 | return -1; | |
58 | } else if (ret < 0) { | |
59 | errno = EIO; | |
60 | return -1; | |
61 | } | |
62 | return ret; | |
63 | } | |
64 | ||
65 | ||
66 | QIOChannelTLS * | |
67 | qio_channel_tls_new_server(QIOChannel *master, | |
68 | QCryptoTLSCreds *creds, | |
69 | const char *aclname, | |
70 | Error **errp) | |
71 | { | |
72 | QIOChannelTLS *ioc; | |
73 | ||
74 | ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS)); | |
75 | ||
76 | ioc->master = master; | |
86d063fa PX |
77 | if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) { |
78 | qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_SHUTDOWN); | |
79 | } | |
ed8ee42c DB |
80 | object_ref(OBJECT(master)); |
81 | ||
82 | ioc->session = qcrypto_tls_session_new( | |
83 | creds, | |
84 | NULL, | |
85 | aclname, | |
86 | QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, | |
87 | errp); | |
88 | if (!ioc->session) { | |
89 | goto error; | |
90 | } | |
91 | ||
92 | qcrypto_tls_session_set_callbacks( | |
93 | ioc->session, | |
94 | qio_channel_tls_write_handler, | |
95 | qio_channel_tls_read_handler, | |
96 | ioc); | |
97 | ||
98 | trace_qio_channel_tls_new_server(ioc, master, creds, aclname); | |
99 | return ioc; | |
100 | ||
101 | error: | |
102 | object_unref(OBJECT(ioc)); | |
103 | return NULL; | |
104 | } | |
105 | ||
106 | QIOChannelTLS * | |
107 | qio_channel_tls_new_client(QIOChannel *master, | |
108 | QCryptoTLSCreds *creds, | |
109 | const char *hostname, | |
110 | Error **errp) | |
111 | { | |
112 | QIOChannelTLS *tioc; | |
113 | QIOChannel *ioc; | |
114 | ||
115 | tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS)); | |
116 | ioc = QIO_CHANNEL(tioc); | |
117 | ||
118 | tioc->master = master; | |
e413ae0c | 119 | if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) { |
d8d3c7cc | 120 | qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN); |
ed8ee42c DB |
121 | } |
122 | object_ref(OBJECT(master)); | |
123 | ||
124 | tioc->session = qcrypto_tls_session_new( | |
125 | creds, | |
126 | hostname, | |
127 | NULL, | |
128 | QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, | |
129 | errp); | |
130 | if (!tioc->session) { | |
131 | goto error; | |
132 | } | |
133 | ||
134 | qcrypto_tls_session_set_callbacks( | |
135 | tioc->session, | |
136 | qio_channel_tls_write_handler, | |
137 | qio_channel_tls_read_handler, | |
138 | tioc); | |
139 | ||
140 | trace_qio_channel_tls_new_client(tioc, master, creds, hostname); | |
141 | return tioc; | |
142 | ||
143 | error: | |
144 | object_unref(OBJECT(tioc)); | |
145 | return NULL; | |
146 | } | |
147 | ||
1939ccda PX |
148 | struct QIOChannelTLSData { |
149 | QIOTask *task; | |
150 | GMainContext *context; | |
151 | }; | |
152 | typedef struct QIOChannelTLSData QIOChannelTLSData; | |
ed8ee42c DB |
153 | |
154 | static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc, | |
155 | GIOCondition condition, | |
156 | gpointer user_data); | |
157 | ||
158 | static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc, | |
1939ccda PX |
159 | QIOTask *task, |
160 | GMainContext *context) | |
ed8ee42c DB |
161 | { |
162 | Error *err = NULL; | |
163 | QCryptoTLSSessionHandshakeStatus status; | |
164 | ||
165 | if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) { | |
166 | trace_qio_channel_tls_handshake_fail(ioc); | |
60e705c5 DB |
167 | qio_task_set_error(task, err); |
168 | qio_task_complete(task); | |
169 | return; | |
ed8ee42c DB |
170 | } |
171 | ||
172 | status = qcrypto_tls_session_get_handshake_status(ioc->session); | |
173 | if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) { | |
174 | trace_qio_channel_tls_handshake_complete(ioc); | |
175 | if (qcrypto_tls_session_check_credentials(ioc->session, | |
176 | &err) < 0) { | |
177 | trace_qio_channel_tls_credentials_deny(ioc); | |
60e705c5 DB |
178 | qio_task_set_error(task, err); |
179 | } else { | |
180 | trace_qio_channel_tls_credentials_allow(ioc); | |
ed8ee42c | 181 | } |
ed8ee42c DB |
182 | qio_task_complete(task); |
183 | } else { | |
184 | GIOCondition condition; | |
1939ccda PX |
185 | QIOChannelTLSData *data = g_new0(typeof(*data), 1); |
186 | ||
187 | data->task = task; | |
188 | data->context = context; | |
189 | ||
190 | if (context) { | |
191 | g_main_context_ref(context); | |
192 | } | |
193 | ||
ed8ee42c DB |
194 | if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) { |
195 | condition = G_IO_OUT; | |
196 | } else { | |
197 | condition = G_IO_IN; | |
198 | } | |
199 | ||
200 | trace_qio_channel_tls_handshake_pending(ioc, status); | |
10be627d DB |
201 | ioc->hs_ioc_tag = |
202 | qio_channel_add_watch_full(ioc->master, | |
203 | condition, | |
204 | qio_channel_tls_handshake_io, | |
205 | data, | |
206 | NULL, | |
207 | context); | |
ed8ee42c | 208 | } |
ed8ee42c DB |
209 | } |
210 | ||
211 | ||
212 | static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc, | |
213 | GIOCondition condition, | |
214 | gpointer user_data) | |
215 | { | |
1939ccda PX |
216 | QIOChannelTLSData *data = user_data; |
217 | QIOTask *task = data->task; | |
218 | GMainContext *context = data->context; | |
ed8ee42c DB |
219 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS( |
220 | qio_task_get_source(task)); | |
221 | ||
10be627d | 222 | tioc->hs_ioc_tag = 0; |
1939ccda PX |
223 | g_free(data); |
224 | qio_channel_tls_handshake_task(tioc, task, context); | |
225 | ||
226 | if (context) { | |
227 | g_main_context_unref(context); | |
228 | } | |
ed8ee42c | 229 | |
ed8ee42c DB |
230 | return FALSE; |
231 | } | |
232 | ||
233 | void qio_channel_tls_handshake(QIOChannelTLS *ioc, | |
234 | QIOTaskFunc func, | |
235 | gpointer opaque, | |
1939ccda PX |
236 | GDestroyNotify destroy, |
237 | GMainContext *context) | |
ed8ee42c DB |
238 | { |
239 | QIOTask *task; | |
240 | ||
241 | task = qio_task_new(OBJECT(ioc), | |
242 | func, opaque, destroy); | |
243 | ||
244 | trace_qio_channel_tls_handshake_start(ioc); | |
1939ccda | 245 | qio_channel_tls_handshake_task(ioc, task, context); |
ed8ee42c DB |
246 | } |
247 | ||
248 | ||
249 | static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED) | |
250 | { | |
251 | } | |
252 | ||
253 | ||
254 | static void qio_channel_tls_finalize(Object *obj) | |
255 | { | |
256 | QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj); | |
257 | ||
258 | object_unref(OBJECT(ioc->master)); | |
259 | qcrypto_tls_session_free(ioc->session); | |
260 | } | |
261 | ||
262 | ||
263 | static ssize_t qio_channel_tls_readv(QIOChannel *ioc, | |
264 | const struct iovec *iov, | |
265 | size_t niov, | |
266 | int **fds, | |
267 | size_t *nfds, | |
84615a19 | 268 | int flags, |
ed8ee42c DB |
269 | Error **errp) |
270 | { | |
271 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
272 | size_t i; | |
273 | ssize_t got = 0; | |
274 | ||
275 | for (i = 0 ; i < niov ; i++) { | |
276 | ssize_t ret = qcrypto_tls_session_read(tioc->session, | |
277 | iov[i].iov_base, | |
278 | iov[i].iov_len); | |
279 | if (ret < 0) { | |
280 | if (errno == EAGAIN) { | |
281 | if (got) { | |
282 | return got; | |
283 | } else { | |
284 | return QIO_CHANNEL_ERR_BLOCK; | |
285 | } | |
a2458b6f | 286 | } else if (errno == ECONNABORTED && |
e4d2bfb1 LS |
287 | (qatomic_load_acquire(&tioc->shutdown) & |
288 | QIO_CHANNEL_SHUTDOWN_READ)) { | |
a2458b6f | 289 | return 0; |
ed8ee42c DB |
290 | } |
291 | ||
292 | error_setg_errno(errp, errno, | |
293 | "Cannot read from TLS channel"); | |
294 | return -1; | |
295 | } | |
296 | got += ret; | |
297 | if (ret < iov[i].iov_len) { | |
298 | break; | |
299 | } | |
300 | } | |
301 | return got; | |
302 | } | |
303 | ||
304 | ||
305 | static ssize_t qio_channel_tls_writev(QIOChannel *ioc, | |
306 | const struct iovec *iov, | |
307 | size_t niov, | |
308 | int *fds, | |
309 | size_t nfds, | |
b88651cb | 310 | int flags, |
ed8ee42c DB |
311 | Error **errp) |
312 | { | |
313 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
314 | size_t i; | |
315 | ssize_t done = 0; | |
316 | ||
317 | for (i = 0 ; i < niov ; i++) { | |
318 | ssize_t ret = qcrypto_tls_session_write(tioc->session, | |
319 | iov[i].iov_base, | |
320 | iov[i].iov_len); | |
321 | if (ret <= 0) { | |
322 | if (errno == EAGAIN) { | |
323 | if (done) { | |
324 | return done; | |
325 | } else { | |
326 | return QIO_CHANNEL_ERR_BLOCK; | |
327 | } | |
328 | } | |
329 | ||
330 | error_setg_errno(errp, errno, | |
331 | "Cannot write to TLS channel"); | |
332 | return -1; | |
333 | } | |
334 | done += ret; | |
335 | if (ret < iov[i].iov_len) { | |
336 | break; | |
337 | } | |
338 | } | |
339 | return done; | |
340 | } | |
341 | ||
342 | static int qio_channel_tls_set_blocking(QIOChannel *ioc, | |
343 | bool enabled, | |
344 | Error **errp) | |
345 | { | |
346 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
347 | ||
348 | return qio_channel_set_blocking(tioc->master, enabled, errp); | |
349 | } | |
350 | ||
351 | static void qio_channel_tls_set_delay(QIOChannel *ioc, | |
352 | bool enabled) | |
353 | { | |
354 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
355 | ||
356 | qio_channel_set_delay(tioc->master, enabled); | |
357 | } | |
358 | ||
359 | static void qio_channel_tls_set_cork(QIOChannel *ioc, | |
360 | bool enabled) | |
361 | { | |
362 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
363 | ||
364 | qio_channel_set_cork(tioc->master, enabled); | |
365 | } | |
366 | ||
367 | static int qio_channel_tls_shutdown(QIOChannel *ioc, | |
368 | QIOChannelShutdown how, | |
369 | Error **errp) | |
370 | { | |
371 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
372 | ||
e4d2bfb1 | 373 | qatomic_or(&tioc->shutdown, how); |
a2458b6f | 374 | |
ed8ee42c DB |
375 | return qio_channel_shutdown(tioc->master, how, errp); |
376 | } | |
377 | ||
378 | static int qio_channel_tls_close(QIOChannel *ioc, | |
379 | Error **errp) | |
380 | { | |
381 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
382 | ||
10be627d DB |
383 | if (tioc->hs_ioc_tag) { |
384 | g_clear_handle_id(&tioc->hs_ioc_tag, g_source_remove); | |
385 | } | |
386 | ||
ed8ee42c DB |
387 | return qio_channel_close(tioc->master, errp); |
388 | } | |
389 | ||
bf88c124 | 390 | static void qio_channel_tls_set_aio_fd_handler(QIOChannel *ioc, |
06e0f098 | 391 | AioContext *read_ctx, |
bf88c124 | 392 | IOHandler *io_read, |
06e0f098 | 393 | AioContext *write_ctx, |
bf88c124 PB |
394 | IOHandler *io_write, |
395 | void *opaque) | |
396 | { | |
397 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
398 | ||
06e0f098 SH |
399 | qio_channel_set_aio_fd_handler(tioc->master, read_ctx, io_read, |
400 | write_ctx, io_write, opaque); | |
bf88c124 PB |
401 | } |
402 | ||
ffda5db6 AD |
403 | typedef struct QIOChannelTLSSource QIOChannelTLSSource; |
404 | struct QIOChannelTLSSource { | |
405 | GSource parent; | |
406 | QIOChannelTLS *tioc; | |
407 | }; | |
408 | ||
409 | static gboolean | |
410 | qio_channel_tls_source_check(GSource *source) | |
411 | { | |
412 | QIOChannelTLSSource *tsource = (QIOChannelTLSSource *)source; | |
413 | ||
414 | return qcrypto_tls_session_check_pending(tsource->tioc->session) > 0; | |
415 | } | |
416 | ||
417 | static gboolean | |
418 | qio_channel_tls_source_prepare(GSource *source, gint *timeout) | |
419 | { | |
420 | *timeout = -1; | |
421 | return qio_channel_tls_source_check(source); | |
422 | } | |
423 | ||
424 | static gboolean | |
425 | qio_channel_tls_source_dispatch(GSource *source, GSourceFunc callback, | |
426 | gpointer user_data) | |
427 | { | |
428 | return G_SOURCE_CONTINUE; | |
429 | } | |
430 | ||
431 | static void | |
432 | qio_channel_tls_source_finalize(GSource *source) | |
433 | { | |
434 | QIOChannelTLSSource *tsource = (QIOChannelTLSSource *)source; | |
435 | ||
436 | object_unref(OBJECT(tsource->tioc)); | |
437 | } | |
438 | ||
439 | static GSourceFuncs qio_channel_tls_source_funcs = { | |
440 | qio_channel_tls_source_prepare, | |
441 | qio_channel_tls_source_check, | |
442 | qio_channel_tls_source_dispatch, | |
443 | qio_channel_tls_source_finalize | |
444 | }; | |
445 | ||
446 | static void | |
447 | qio_channel_tls_read_watch(QIOChannelTLS *tioc, GSource *source) | |
448 | { | |
449 | GSource *child; | |
450 | QIOChannelTLSSource *tlssource; | |
451 | ||
452 | child = g_source_new(&qio_channel_tls_source_funcs, | |
453 | sizeof(QIOChannelTLSSource)); | |
454 | tlssource = (QIOChannelTLSSource *)child; | |
455 | ||
456 | tlssource->tioc = tioc; | |
457 | object_ref(OBJECT(tioc)); | |
458 | ||
459 | g_source_add_child_source(source, child); | |
c3a2c84a | 460 | g_source_unref(child); |
ffda5db6 AD |
461 | } |
462 | ||
ed8ee42c DB |
463 | static GSource *qio_channel_tls_create_watch(QIOChannel *ioc, |
464 | GIOCondition condition) | |
465 | { | |
466 | QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc); | |
ffda5db6 AD |
467 | GSource *source = qio_channel_create_watch(tioc->master, condition); |
468 | ||
469 | if (condition & G_IO_IN) { | |
470 | qio_channel_tls_read_watch(tioc, source); | |
471 | } | |
ed8ee42c | 472 | |
ffda5db6 | 473 | return source; |
ed8ee42c DB |
474 | } |
475 | ||
476 | QCryptoTLSSession * | |
477 | qio_channel_tls_get_session(QIOChannelTLS *ioc) | |
478 | { | |
479 | return ioc->session; | |
480 | } | |
481 | ||
482 | static void qio_channel_tls_class_init(ObjectClass *klass, | |
483 | void *class_data G_GNUC_UNUSED) | |
484 | { | |
485 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
486 | ||
487 | ioc_klass->io_writev = qio_channel_tls_writev; | |
488 | ioc_klass->io_readv = qio_channel_tls_readv; | |
489 | ioc_klass->io_set_blocking = qio_channel_tls_set_blocking; | |
490 | ioc_klass->io_set_delay = qio_channel_tls_set_delay; | |
491 | ioc_klass->io_set_cork = qio_channel_tls_set_cork; | |
492 | ioc_klass->io_close = qio_channel_tls_close; | |
493 | ioc_klass->io_shutdown = qio_channel_tls_shutdown; | |
494 | ioc_klass->io_create_watch = qio_channel_tls_create_watch; | |
bf88c124 | 495 | ioc_klass->io_set_aio_fd_handler = qio_channel_tls_set_aio_fd_handler; |
ed8ee42c DB |
496 | } |
497 | ||
498 | static const TypeInfo qio_channel_tls_info = { | |
499 | .parent = TYPE_QIO_CHANNEL, | |
500 | .name = TYPE_QIO_CHANNEL_TLS, | |
501 | .instance_size = sizeof(QIOChannelTLS), | |
502 | .instance_init = qio_channel_tls_init, | |
503 | .instance_finalize = qio_channel_tls_finalize, | |
504 | .class_init = qio_channel_tls_class_init, | |
505 | }; | |
506 | ||
507 | static void qio_channel_tls_register_types(void) | |
508 | { | |
509 | type_register_static(&qio_channel_tls_info); | |
510 | } | |
511 | ||
512 | type_init(qio_channel_tls_register_types); |