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path: root/libavformat/tls_openssl.c (plain)
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1/*
2 * TLS/SSL Protocol
3 * Copyright (c) 2011 Martin Storsjo
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avformat.h"
23#include "internal.h"
24#include "network.h"
25#include "os_support.h"
26#include "url.h"
27#include "tls.h"
28#include "libavcodec/internal.h"
29#include "libavutil/avstring.h"
30#include "libavutil/avutil.h"
31#include "libavutil/opt.h"
32#include "libavutil/parseutils.h"
33#include "libavutil/thread.h"
34
35#include <openssl/bio.h>
36#include <openssl/ssl.h>
37#include <openssl/err.h>
38
39static int openssl_init;
40
41typedef struct TLSContext {
42 const AVClass *class;
43 TLSShared tls_shared;
44 SSL_CTX *ctx;
45 SSL *ssl;
46#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
47 BIO_METHOD* url_bio_method;
48#endif
49} TLSContext;
50
51#if HAVE_THREADS
52#include <openssl/crypto.h>
53pthread_mutex_t *openssl_mutexes;
54static void openssl_lock(int mode, int type, const char *file, int line)
55{
56 if (mode & CRYPTO_LOCK)
57 pthread_mutex_lock(&openssl_mutexes[type]);
58 else
59 pthread_mutex_unlock(&openssl_mutexes[type]);
60}
61#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
62static unsigned long openssl_thread_id(void)
63{
64 return (intptr_t) pthread_self();
65}
66#endif
67#endif
68
69static int url_bio_create(BIO *b)
70{
71#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
72 BIO_set_init(b, 1);
73 BIO_set_data(b, NULL);
74 BIO_set_flags(b, 0);
75#else
76 b->init = 1;
77 b->ptr = NULL;
78 b->flags = 0;
79#endif
80 return 1;
81}
82
83static int url_bio_destroy(BIO *b)
84{
85 return 1;
86}
87
88#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
89#define GET_BIO_DATA(x) BIO_get_data(x)
90#else
91#define GET_BIO_DATA(x) (x)->ptr
92#endif
93
94static int url_bio_bread(BIO *b, char *buf, int len)
95{
96 URLContext *h = GET_BIO_DATA(b);
97 int ret = ffurl_read(h, buf, len);
98 if (ret >= 0)
99 return ret;
100 BIO_clear_retry_flags(b);
101 if (ret == AVERROR_EXIT)
102 return 0;
103 return -1;
104}
105
106static int url_bio_bwrite(BIO *b, const char *buf, int len)
107{
108 URLContext *h = GET_BIO_DATA(b);
109 int ret = ffurl_write(h, buf, len);
110 if (ret >= 0)
111 return ret;
112 BIO_clear_retry_flags(b);
113 if (ret == AVERROR_EXIT)
114 return 0;
115 return -1;
116}
117
118static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
119{
120 if (cmd == BIO_CTRL_FLUSH) {
121 BIO_clear_retry_flags(b);
122 return 1;
123 }
124 return 0;
125}
126
127static int url_bio_bputs(BIO *b, const char *str)
128{
129 return url_bio_bwrite(b, str, strlen(str));
130}
131
132#if OPENSSL_VERSION_NUMBER < 0x1010000fL
133static BIO_METHOD url_bio_method = {
134 .type = BIO_TYPE_SOURCE_SINK,
135 .name = "urlprotocol bio",
136 .bwrite = url_bio_bwrite,
137 .bread = url_bio_bread,
138 .bputs = url_bio_bputs,
139 .bgets = NULL,
140 .ctrl = url_bio_ctrl,
141 .create = url_bio_create,
142 .destroy = url_bio_destroy,
143};
144#endif
145
146int ff_openssl_init(void)
147{
148 avpriv_lock_avformat();
149 if (!openssl_init) {
150 SSL_library_init();
151 SSL_load_error_strings();
152#if HAVE_THREADS
153 if (!CRYPTO_get_locking_callback()) {
154 int i;
155 openssl_mutexes = av_malloc_array(sizeof(pthread_mutex_t), CRYPTO_num_locks());
156 if (!openssl_mutexes) {
157 avpriv_unlock_avformat();
158 return AVERROR(ENOMEM);
159 }
160
161 for (i = 0; i < CRYPTO_num_locks(); i++)
162 pthread_mutex_init(&openssl_mutexes[i], NULL);
163 CRYPTO_set_locking_callback(openssl_lock);
164#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
165 CRYPTO_set_id_callback(openssl_thread_id);
166#endif
167 }
168#endif
169 }
170 openssl_init++;
171 avpriv_unlock_avformat();
172
173 return 0;
174}
175
176void ff_openssl_deinit(void)
177{
178 avpriv_lock_avformat();
179 openssl_init--;
180 if (!openssl_init) {
181#if HAVE_THREADS
182 if (CRYPTO_get_locking_callback() == openssl_lock) {
183 int i;
184 CRYPTO_set_locking_callback(NULL);
185 for (i = 0; i < CRYPTO_num_locks(); i++)
186 pthread_mutex_destroy(&openssl_mutexes[i]);
187 av_free(openssl_mutexes);
188 }
189#endif
190 }
191 avpriv_unlock_avformat();
192}
193
194static int print_tls_error(URLContext *h, int ret)
195{
196 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
197 return AVERROR(EIO);
198}
199
200static int tls_close(URLContext *h)
201{
202 TLSContext *c = h->priv_data;
203 if (c->ssl) {
204 SSL_shutdown(c->ssl);
205 SSL_free(c->ssl);
206 }
207 if (c->ctx)
208 SSL_CTX_free(c->ctx);
209 if (c->tls_shared.tcp)
210 ffurl_close(c->tls_shared.tcp);
211#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
212 if (c->url_bio_method)
213 BIO_meth_free(c->url_bio_method);
214#endif
215 ff_openssl_deinit();
216 return 0;
217}
218
219static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
220{
221 TLSContext *p = h->priv_data;
222 TLSShared *c = &p->tls_shared;
223 BIO *bio;
224 int ret;
225
226 if ((ret = ff_openssl_init()) < 0)
227 return ret;
228
229 if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
230 goto fail;
231
232 // We want to support all versions of TLS >= 1.0, but not the deprecated
233 // and insecure SSLv2 and SSLv3. Despite the name, SSLv23_*_method()
234 // enables support for all versions of SSL and TLS, and we then disable
235 // support for the old protocols immediately after creating the context.
236 p->ctx = SSL_CTX_new(c->listen ? SSLv23_server_method() : SSLv23_client_method());
237 if (!p->ctx) {
238 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
239 ret = AVERROR(EIO);
240 goto fail;
241 }
242 SSL_CTX_set_options(p->ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
243 if (c->ca_file) {
244 if (!SSL_CTX_load_verify_locations(p->ctx, c->ca_file, NULL))
245 av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
246 }
247 if (c->cert_file && !SSL_CTX_use_certificate_chain_file(p->ctx, c->cert_file)) {
248 av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
249 c->cert_file, ERR_error_string(ERR_get_error(), NULL));
250 ret = AVERROR(EIO);
251 goto fail;
252 }
253 if (c->key_file && !SSL_CTX_use_PrivateKey_file(p->ctx, c->key_file, SSL_FILETYPE_PEM)) {
254 av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
255 c->key_file, ERR_error_string(ERR_get_error(), NULL));
256 ret = AVERROR(EIO);
257 goto fail;
258 }
259 // Note, this doesn't check that the peer certificate actually matches
260 // the requested hostname.
261 if (c->verify)
262 SSL_CTX_set_verify(p->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
263 p->ssl = SSL_new(p->ctx);
264 if (!p->ssl) {
265 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
266 ret = AVERROR(EIO);
267 goto fail;
268 }
269#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
270 p->url_bio_method = BIO_meth_new(BIO_TYPE_SOURCE_SINK, "urlprotocol bio");
271 BIO_meth_set_write(p->url_bio_method, url_bio_bwrite);
272 BIO_meth_set_read(p->url_bio_method, url_bio_bread);
273 BIO_meth_set_puts(p->url_bio_method, url_bio_bputs);
274 BIO_meth_set_ctrl(p->url_bio_method, url_bio_ctrl);
275 BIO_meth_set_create(p->url_bio_method, url_bio_create);
276 BIO_meth_set_destroy(p->url_bio_method, url_bio_destroy);
277 bio = BIO_new(p->url_bio_method);
278 BIO_set_data(bio, c->tcp);
279#else
280 bio = BIO_new(&url_bio_method);
281 bio->ptr = c->tcp;
282#endif
283 SSL_set_bio(p->ssl, bio, bio);
284 if (!c->listen && !c->numerichost)
285 SSL_set_tlsext_host_name(p->ssl, c->host);
286 ret = c->listen ? SSL_accept(p->ssl) : SSL_connect(p->ssl);
287 if (ret == 0) {
288 av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
289 ret = AVERROR(EIO);
290 goto fail;
291 } else if (ret < 0) {
292 ret = print_tls_error(h, ret);
293 goto fail;
294 }
295
296 return 0;
297fail:
298 tls_close(h);
299 return ret;
300}
301
302static int tls_read(URLContext *h, uint8_t *buf, int size)
303{
304 TLSContext *c = h->priv_data;
305 int ret = SSL_read(c->ssl, buf, size);
306 if (ret > 0)
307 return ret;
308 if (ret == 0)
309 return AVERROR_EOF;
310 return print_tls_error(h, ret);
311}
312
313static int tls_write(URLContext *h, const uint8_t *buf, int size)
314{
315 TLSContext *c = h->priv_data;
316 int ret = SSL_write(c->ssl, buf, size);
317 if (ret > 0)
318 return ret;
319 if (ret == 0)
320 return AVERROR_EOF;
321 return print_tls_error(h, ret);
322}
323
324static int tls_get_file_handle(URLContext *h)
325{
326 TLSContext *c = h->priv_data;
327 return ffurl_get_file_handle(c->tls_shared.tcp);
328}
329
330static const AVOption options[] = {
331 TLS_COMMON_OPTIONS(TLSContext, tls_shared),
332 { NULL }
333};
334
335static const AVClass tls_class = {
336 .class_name = "tls",
337 .item_name = av_default_item_name,
338 .option = options,
339 .version = LIBAVUTIL_VERSION_INT,
340};
341
342const URLProtocol ff_tls_openssl_protocol = {
343 .name = "tls",
344 .url_open2 = tls_open,
345 .url_read = tls_read,
346 .url_write = tls_write,
347 .url_close = tls_close,
348 .url_get_file_handle = tls_get_file_handle,
349 .priv_data_size = sizeof(TLSContext),
350 .flags = URL_PROTOCOL_FLAG_NETWORK,
351 .priv_data_class = &tls_class,
352};
353
generated by cgit at 2024-05-17 06:31:03 (GMT)