path: root/libavformat/tls_schannel.c (plain)
blob: 065dccb020a3512c68eff8be00f3221653e23fec

1	/*
2	* Copyright (c) 2015 Hendrik Leppkes
3	*
4	* This file is part of FFmpeg.
5	*
6	* FFmpeg 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	* FFmpeg 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 FFmpeg; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19	*/
20
21	/** Based on the CURL SChannel module */
22
23	#include "avformat.h"
24	#include "internal.h"
25	#include "network.h"
26	#include "os_support.h"
27	#include "url.h"
28	#include "tls.h"
29
30	#define SECURITY_WIN32
31	#include <windows.h>
32	#include <security.h>
33	#include <schnlsp.h>
34
35	#define SCHANNEL_INITIAL_BUFFER_SIZE 4096
36	#define SCHANNEL_FREE_BUFFER_SIZE 1024
37
38	/* mingw does not define this symbol */
39	#ifndef SECBUFFER_ALERT
40	#define SECBUFFER_ALERT 17
41	#endif
42
43	typedef struct TLSContext {
44	const AVClass *class;
45	TLSShared tls_shared;
46
47	CredHandle cred_handle;
48	TimeStamp cred_timestamp;
49
50	CtxtHandle ctxt_handle;
51	TimeStamp ctxt_timestamp;
52
53	ULONG request_flags;
54	ULONG context_flags;
55
56	uint8_t *enc_buf;
57	int enc_buf_size;
58	int enc_buf_offset;
59
60	uint8_t *dec_buf;
61	int dec_buf_size;
62	int dec_buf_offset;
63
64	SecPkgContext_StreamSizes sizes;
65
66	int connected;
67	int connection_closed;
68	int sspi_close_notify;
69	} TLSContext;
70
71	static void init_sec_buffer(SecBuffer *buffer, unsigned long type,
72	void *data, unsigned long size)
73	{
74	buffer->cbBuffer = size;
75	buffer->BufferType = type;
76	buffer->pvBuffer = data;
77	}
78
79	static void init_sec_buffer_desc(SecBufferDesc *desc, SecBuffer *buffers,
80	unsigned long buffer_count)
81	{
82	desc->ulVersion = SECBUFFER_VERSION;
83	desc->pBuffers = buffers;
84	desc->cBuffers = buffer_count;
85	}
86
87	static int tls_shutdown_client(URLContext *h)
88	{
89	TLSContext *c = h->priv_data;
90	TLSShared *s = &c->tls_shared;
91	int ret;
92
93	if (c->connected) {
94	SecBufferDesc BuffDesc;
95	SecBuffer Buffer;
96	SECURITY_STATUS sspi_ret;
97	SecBuffer outbuf;
98	SecBufferDesc outbuf_desc;
99
100	DWORD dwshut = SCHANNEL_SHUTDOWN;
101	init_sec_buffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
102	init_sec_buffer_desc(&BuffDesc, &Buffer, 1);
103
104	sspi_ret = ApplyControlToken(&c->ctxt_handle, &BuffDesc);
105	if (sspi_ret != SEC_E_OK)
106	av_log(h, AV_LOG_ERROR, "ApplyControlToken failed\n");
107
108	init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
109	init_sec_buffer_desc(&outbuf_desc, &outbuf, 1);
110
111	sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host,
112	c->request_flags, 0, 0, NULL, 0, &c->ctxt_handle,
113	&outbuf_desc, &c->context_flags, &c->ctxt_timestamp);
114	if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_CONTEXT_EXPIRED) {
115	ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer);
116	FreeContextBuffer(outbuf.pvBuffer);
117	if (ret < 0 || ret != outbuf.cbBuffer)
118	av_log(h, AV_LOG_ERROR, "Failed to send close message\n");
119	}
120
121	c->connected = 0;
122	}
123	return 0;
124	}
125
126	static int tls_close(URLContext *h)
127	{
128	TLSContext *c = h->priv_data;
129
130	tls_shutdown_client(h);
131
132	DeleteSecurityContext(&c->ctxt_handle);
133	FreeCredentialsHandle(&c->cred_handle);
134
135	av_freep(&c->enc_buf);
136	c->enc_buf_size = c->enc_buf_offset = 0;
137
138	av_freep(&c->dec_buf);
139	c->dec_buf_size = c->dec_buf_offset = 0;
140
141	if (c->tls_shared.tcp)
142	ffurl_close(c->tls_shared.tcp);
143	return 0;
144	}
145
146	static int tls_client_handshake_loop(URLContext *h, int initial)
147	{
148	TLSContext *c = h->priv_data;
149	TLSShared *s = &c->tls_shared;
150	SECURITY_STATUS sspi_ret;
151	SecBuffer outbuf[3];
152	SecBufferDesc outbuf_desc;
153	SecBuffer inbuf[2];
154	SecBufferDesc inbuf_desc;
155	int i, ret = 0, read_data = initial;
156
157	if (c->enc_buf == NULL) {
158	c->enc_buf_offset = 0;
159	ret = av_reallocp(&c->enc_buf, SCHANNEL_INITIAL_BUFFER_SIZE);
160	if (ret < 0)
161	goto fail;
162	c->enc_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE;
163	}
164
165	if (c->dec_buf == NULL) {
166	c->dec_buf_offset = 0;
167	ret = av_reallocp(&c->dec_buf, SCHANNEL_INITIAL_BUFFER_SIZE);
168	if (ret < 0)
169	goto fail;
170	c->dec_buf_size = SCHANNEL_INITIAL_BUFFER_SIZE;
171	}
172
173	while (1) {
174	if (c->enc_buf_size - c->enc_buf_offset < SCHANNEL_FREE_BUFFER_SIZE) {
175	c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE;
176	ret = av_reallocp(&c->enc_buf, c->enc_buf_size);
177	if (ret < 0) {
178	c->enc_buf_size = c->enc_buf_offset = 0;
179	goto fail;
180	}
181	}
182
183	if (read_data) {
184	ret = ffurl_read(c->tls_shared.tcp, c->enc_buf + c->enc_buf_offset,
185	c->enc_buf_size - c->enc_buf_offset);
186	if (ret < 0) {
187	av_log(h, AV_LOG_ERROR, "Failed to read handshake response\n");
188	goto fail;
189	}
190	c->enc_buf_offset += ret;
191	}
192
193	/* input buffers */
194	init_sec_buffer(&inbuf[0], SECBUFFER_TOKEN, av_malloc(c->enc_buf_offset), c->enc_buf_offset);
195	init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
196	init_sec_buffer_desc(&inbuf_desc, inbuf, 2);
197
198	if (inbuf[0].pvBuffer == NULL) {
199	av_log(h, AV_LOG_ERROR, "Failed to allocate input buffer\n");
200	ret = AVERROR(ENOMEM);
201	goto fail;
202	}
203
204	memcpy(inbuf[0].pvBuffer, c->enc_buf, c->enc_buf_offset);
205
206	/* output buffers */
207	init_sec_buffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
208	init_sec_buffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
209	init_sec_buffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0);
210	init_sec_buffer_desc(&outbuf_desc, outbuf, 3);
211
212	sspi_ret = InitializeSecurityContext(&c->cred_handle, &c->ctxt_handle, s->host, c->request_flags,
213	0, 0, &inbuf_desc, 0, NULL, &outbuf_desc, &c->context_flags,
214	&c->ctxt_timestamp);
215	av_freep(&inbuf[0].pvBuffer);
216
217	if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) {
218	av_log(h, AV_LOG_DEBUG, "Received incomplete handshake, need more data\n");
219	read_data = 1;
220	continue;
221	}
222
223	/* remote requests a client certificate - attempt to continue without one anyway */
224	if (sspi_ret == SEC_I_INCOMPLETE_CREDENTIALS &&
225	!(c->request_flags & ISC_REQ_USE_SUPPLIED_CREDS)) {
226	av_log(h, AV_LOG_VERBOSE, "Client certificate has been requested, ignoring\n");
227	c->request_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
228	read_data = 0;
229	continue;
230	}
231
232	/* continue handshake */
233	if (sspi_ret == SEC_I_CONTINUE_NEEDED || sspi_ret == SEC_E_OK) {
234	for (i = 0; i < 3; i++) {
235	if (outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
236	ret = ffurl_write(c->tls_shared.tcp, outbuf[i].pvBuffer, outbuf[i].cbBuffer);
237	if (ret < 0 || ret != outbuf[i].cbBuffer) {
238	av_log(h, AV_LOG_VERBOSE, "Failed to send handshake data\n");
239	ret = AVERROR(EIO);
240	goto fail;
241	}
242	}
243
244	if (outbuf[i].pvBuffer != NULL) {
245	FreeContextBuffer(outbuf[i].pvBuffer);
246	outbuf[i].pvBuffer = NULL;
247	}
248	}
249	} else {
250	if (sspi_ret == SEC_E_WRONG_PRINCIPAL)
251	av_log(h, AV_LOG_ERROR, "SNI or certificate check failed\n");
252	else
253	av_log(h, AV_LOG_ERROR, "Creating security context failed (0x%lx)\n", sspi_ret);
254	ret = AVERROR_UNKNOWN;
255	goto fail;
256	}
257
258	if (inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
259	if (c->enc_buf_offset > inbuf[1].cbBuffer) {
260	memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[1].cbBuffer,
261	inbuf[1].cbBuffer);
262	c->enc_buf_offset = inbuf[1].cbBuffer;
263	if (sspi_ret == SEC_I_CONTINUE_NEEDED) {
264	read_data = 0;
265	continue;
266	}
267	}
268	} else {
269	c->enc_buf_offset = 0;
270	}
271
272	if (sspi_ret == SEC_I_CONTINUE_NEEDED) {
273	read_data = 1;
274	continue;
275	}
276
277	break;
278	}
279
280	return 0;
281
282	fail:
283	/* free any remaining output data */
284	for (i = 0; i < 3; i++) {
285	if (outbuf[i].pvBuffer != NULL) {
286	FreeContextBuffer(outbuf[i].pvBuffer);
287	outbuf[i].pvBuffer = NULL;
288	}
289	}
290
291	return ret;
292	}
293
294	static int tls_client_handshake(URLContext *h)
295	{
296	TLSContext *c = h->priv_data;
297	TLSShared *s = &c->tls_shared;
298	SecBuffer outbuf;
299	SecBufferDesc outbuf_desc;
300	SECURITY_STATUS sspi_ret;
301	int ret;
302
303	init_sec_buffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
304	init_sec_buffer_desc(&outbuf_desc, &outbuf, 1);
305
306	c->request_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
307	ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
308	ISC_REQ_STREAM;
309
310	sspi_ret = InitializeSecurityContext(&c->cred_handle, NULL, s->host, c->request_flags, 0, 0,
311	NULL, 0, &c->ctxt_handle, &outbuf_desc, &c->context_flags,
312	&c->ctxt_timestamp);
313	if (sspi_ret != SEC_I_CONTINUE_NEEDED) {
314	av_log(h, AV_LOG_ERROR, "Unable to create initial security context (0x%lx)\n", sspi_ret);
315	ret = AVERROR_UNKNOWN;
316	goto fail;
317	}
318
319	ret = ffurl_write(s->tcp, outbuf.pvBuffer, outbuf.cbBuffer);
320	FreeContextBuffer(outbuf.pvBuffer);
321	if (ret < 0 || ret != outbuf.cbBuffer) {
322	av_log(h, AV_LOG_ERROR, "Failed to send initial handshake data\n");
323	ret = AVERROR(EIO);
324	goto fail;
325	}
326
327	return tls_client_handshake_loop(h, 1);
328
329	fail:
330	DeleteSecurityContext(&c->ctxt_handle);
331	return ret;
332	}
333
334	static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
335	{
336	TLSContext *c = h->priv_data;
337	TLSShared *s = &c->tls_shared;
338	SECURITY_STATUS sspi_ret;
339	SCHANNEL_CRED schannel_cred = { 0 };
340	int ret;
341
342	if ((ret = ff_tls_open_underlying(s, h, uri, options)) < 0)
343	goto fail;
344
345	if (s->listen) {
346	av_log(h, AV_LOG_ERROR, "TLS Listen Sockets with SChannel is not implemented.\n");
347	ret = AVERROR(EINVAL);
348	goto fail;
349	}
350
351	/* SChannel Options */
352	schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
353
354	if (s->verify)
355	schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION |
356	SCH_CRED_REVOCATION_CHECK_CHAIN;
357	else
358	schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
359	SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
360	SCH_CRED_IGNORE_REVOCATION_OFFLINE;
361
362	/* Get credential handle */
363	sspi_ret = AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME, SECPKG_CRED_OUTBOUND,
364	NULL, &schannel_cred, NULL, NULL, &c->cred_handle,
365	&c->cred_timestamp);
366	if (sspi_ret != SEC_E_OK) {
367	av_log(h, AV_LOG_ERROR, "Unable to acquire security credentials (0x%lx)\n", sspi_ret);
368	ret = AVERROR_UNKNOWN;
369	goto fail;
370	}
371
372	ret = tls_client_handshake(h);
373	if (ret < 0)
374	goto fail;
375
376	c->connected = 1;
377
378	return 0;
379
380	fail:
381	tls_close(h);
382	return ret;
383	}
384
385	static int tls_read(URLContext *h, uint8_t *buf, int len)
386	{
387	TLSContext *c = h->priv_data;
388	TLSShared *s = &c->tls_shared;
389	SECURITY_STATUS sspi_ret = SEC_E_OK;
390	SecBuffer inbuf[4];
391	SecBufferDesc inbuf_desc;
392	int size, ret;
393	int min_enc_buf_size = len + SCHANNEL_FREE_BUFFER_SIZE;
394
395	if (len <= c->dec_buf_offset)
396	goto cleanup;
397
398	if (c->sspi_close_notify)
399	goto cleanup;
400
401	if (!c->connection_closed) {
402	size = c->enc_buf_size - c->enc_buf_offset;
403	if (size < SCHANNEL_FREE_BUFFER_SIZE || c->enc_buf_size < min_enc_buf_size) {
404	c->enc_buf_size = c->enc_buf_offset + SCHANNEL_FREE_BUFFER_SIZE;
405	if (c->enc_buf_size < min_enc_buf_size)
406	c->enc_buf_size = min_enc_buf_size;
407	ret = av_reallocp(&c->enc_buf, c->enc_buf_size);
408	if (ret < 0) {
409	c->enc_buf_size = c->enc_buf_offset = 0;
410	return ret;
411	}
412	}
413
414	ret = ffurl_read(s->tcp, c->enc_buf + c->enc_buf_offset,
415	c->enc_buf_size - c->enc_buf_offset);
416	if (ret < 0) {
417	av_log(h, AV_LOG_ERROR, "Unable to read from socket\n");
418	return ret;
419	} else if (ret == 0)
420	c->connection_closed = 1;
421
422	c->enc_buf_offset += ret;
423	}
424
425	while (c->enc_buf_offset > 0 && sspi_ret == SEC_E_OK && c->dec_buf_offset < len) {
426	/* input buffer */
427	init_sec_buffer(&inbuf[0], SECBUFFER_DATA, c->enc_buf, c->enc_buf_offset);
428
429	/* additional buffers for possible output */
430	init_sec_buffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
431	init_sec_buffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);
432	init_sec_buffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);
433	init_sec_buffer_desc(&inbuf_desc, inbuf, 4);
434
435	sspi_ret = DecryptMessage(&c->ctxt_handle, &inbuf_desc, 0, NULL);
436	if (sspi_ret == SEC_E_OK || sspi_ret == SEC_I_RENEGOTIATE ||
437	sspi_ret == SEC_I_CONTEXT_EXPIRED) {
438	/* handle decrypted data */
439	if (inbuf[1].BufferType == SECBUFFER_DATA) {
440	/* grow buffer if needed */
441	size = inbuf[1].cbBuffer > SCHANNEL_FREE_BUFFER_SIZE ?
442	inbuf[1].cbBuffer : SCHANNEL_FREE_BUFFER_SIZE;
443	if (c->dec_buf_size - c->dec_buf_offset < size || c->dec_buf_size < len) {
444	c->dec_buf_size = c->dec_buf_offset + size;
445	if (c->dec_buf_size < len)
446	c->dec_buf_size = len;
447	ret = av_reallocp(&c->dec_buf, c->dec_buf_size);
448	if (ret < 0) {
449	c->dec_buf_size = c->dec_buf_offset = 0;
450	return ret;
451	}
452	}
453
454	/* copy decrypted data to buffer */
455	size = inbuf[1].cbBuffer;
456	if (size) {
457	memcpy(c->dec_buf + c->dec_buf_offset, inbuf[1].pvBuffer, size);
458	c->dec_buf_offset += size;
459	}
460	}
461	if (inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
462	if (c->enc_buf_offset > inbuf[3].cbBuffer) {
463	memmove(c->enc_buf, (c->enc_buf + c->enc_buf_offset) - inbuf[3].cbBuffer,
464	inbuf[3].cbBuffer);
465	c->enc_buf_offset = inbuf[3].cbBuffer;
466	}
467	} else
468	c->enc_buf_offset = 0;
469
470	if (sspi_ret == SEC_I_RENEGOTIATE) {
471	if (c->enc_buf_offset) {
472	av_log(h, AV_LOG_ERROR, "Cannot renegotiate, encrypted data buffer not empty\n");
473	ret = AVERROR_UNKNOWN;
474	goto cleanup;
475	}
476
477	av_log(h, AV_LOG_VERBOSE, "Re-negotiating security context\n");
478	ret = tls_client_handshake_loop(h, 0);
479	if (ret < 0) {
480	goto cleanup;
481	}
482	sspi_ret = SEC_E_OK;
483	continue;
484	} else if (sspi_ret == SEC_I_CONTEXT_EXPIRED) {
485	c->sspi_close_notify = 1;
486	if (!c->connection_closed) {
487	c->connection_closed = 1;
488	av_log(h, AV_LOG_VERBOSE, "Server closed the connection\n");
489	}
490	ret = 0;
491	goto cleanup;
492	}
493	} else if (sspi_ret == SEC_E_INCOMPLETE_MESSAGE) {
494	ret = AVERROR(EAGAIN);
495	goto cleanup;
496	} else {
497	av_log(h, AV_LOG_ERROR, "Unable to decrypt message\n");
498	ret = AVERROR(EIO);
499	goto cleanup;
500	}
501	}
502
503	ret = 0;
504
505	cleanup:
506	size = FFMIN(len, c->dec_buf_offset);
507	if (size) {
508	memcpy(buf, c->dec_buf, size);
509	memmove(c->dec_buf, c->dec_buf + size, c->dec_buf_offset - size);
510	c->dec_buf_offset -= size;
511
512	return size;
513	}
514
515	if (ret == 0 && !c->connection_closed)
516	ret = AVERROR(EAGAIN);
517
518	return ret < 0 ? ret : 0;
519	}
520
521	static int tls_write(URLContext *h, const uint8_t *buf, int len)
522	{
523	TLSContext *c = h->priv_data;
524	TLSShared *s = &c->tls_shared;
525	SECURITY_STATUS sspi_ret;
526	int ret = 0, data_size;
527	uint8_t *data = NULL;
528	SecBuffer outbuf[4];
529	SecBufferDesc outbuf_desc;
530
531	if (c->sizes.cbMaximumMessage == 0) {
532	sspi_ret = QueryContextAttributes(&c->ctxt_handle, SECPKG_ATTR_STREAM_SIZES, &c->sizes);
533	if (sspi_ret != SEC_E_OK)
534	return AVERROR_UNKNOWN;
535	}
536
537	/* limit how much data we can consume */
538	len = FFMIN(len, c->sizes.cbMaximumMessage);
539
540	data_size = c->sizes.cbHeader + len + c->sizes.cbTrailer;
541	data = av_malloc(data_size);
542	if (data == NULL)
543	return AVERROR(ENOMEM);
544
545	init_sec_buffer(&outbuf[0], SECBUFFER_STREAM_HEADER,
546	data, c->sizes.cbHeader);
547	init_sec_buffer(&outbuf[1], SECBUFFER_DATA,
548	data + c->sizes.cbHeader, len);
549	init_sec_buffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,
550	data + c->sizes.cbHeader + len,
551	c->sizes.cbTrailer);
552	init_sec_buffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);
553	init_sec_buffer_desc(&outbuf_desc, outbuf, 4);
554
555	memcpy(outbuf[1].pvBuffer, buf, len);
556
557	sspi_ret = EncryptMessage(&c->ctxt_handle, 0, &outbuf_desc, 0);
558	if (sspi_ret == SEC_E_OK) {
559	len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
560	ret = ffurl_write(s->tcp, data, len);
561	if (ret < 0 || ret != len) {
562	ret = AVERROR(EIO);
563	av_log(h, AV_LOG_ERROR, "Writing encrypted data to socket failed\n");
564	goto done;
565	}
566	} else {
567	av_log(h, AV_LOG_ERROR, "Encrypting data failed\n");
568	if (sspi_ret == SEC_E_INSUFFICIENT_MEMORY)
569	ret = AVERROR(ENOMEM);
570	else
571	ret = AVERROR(EIO);
572	goto done;
573	}
574
575	done:
576	av_freep(&data);
577	return ret < 0 ? ret : outbuf[1].cbBuffer;
578	}
579
580	static int tls_get_file_handle(URLContext *h)
581	{
582	TLSContext *c = h->priv_data;
583	return ffurl_get_file_handle(c->tls_shared.tcp);
584	}
585
586	static const AVOption options[] = {
587	TLS_COMMON_OPTIONS(TLSContext, tls_shared),
588	{ NULL }
589	};
590
591	static const AVClass tls_class = {
592	.class_name = "tls",
593	.item_name = av_default_item_name,
594	.option = options,
595	.version = LIBAVUTIL_VERSION_INT,
596	};
597
598	const URLProtocol ff_tls_schannel_protocol = {
599	.name = "tls",
600	.url_open2 = tls_open,
601	.url_read = tls_read,
602	.url_write = tls_write,
603	.url_close = tls_close,
604	.url_get_file_handle = tls_get_file_handle,
605	.priv_data_size = sizeof(TLSContext),
606	.flags = URL_PROTOCOL_FLAG_NETWORK,
607	.priv_data_class = &tls_class,
608	};
609