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tls_openssl.c
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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 
39 static int openssl_init;
40 
41 typedef struct TLSContext {
42  const AVClass *class;
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>
53 pthread_mutex_t *openssl_mutexes;
54 static 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
62 static unsigned long openssl_thread_id(void)
63 {
64  return (intptr_t) pthread_self();
65 }
66 #endif
67 #endif
68 
69 static 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 
83 static 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 
94 static int url_bio_bread(BIO *b, char *buf, int len)
95 {
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 
106 static 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 
118 static 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 
127 static 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
133 static 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 
147 {
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) {
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++;
172 
173  return 0;
174 }
175 
177 {
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  }
192 }
193 
194 static 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 
200 static 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)
211 #if OPENSSL_VERSION_NUMBER >= 0x1010000fL
212  if (c->url_bio_method)
213  BIO_meth_free(c->url_bio_method);
214 #endif
216  return 0;
217 }
218 
219 static 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;
297 fail:
298  tls_close(h);
299  return ret;
300 }
301 
302 static 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 
313 static 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 
325 {
326  TLSContext *c = h->priv_data;
328 }
329 
330 static const AVOption options[] = {
331  TLS_COMMON_OPTIONS(TLSContext, tls_shared),
332  { NULL }
333 };
334 
335 static 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 
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),
351  .priv_data_class = &tls_class,
352 };
#define NULL
Definition: coverity.c:32
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:106
static int openssl_init
Definition: tls_openssl.c:39
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
#define pthread_mutex_lock(a)
Definition: ffprobe.c:60
int avpriv_unlock_avformat(void)
Definition: utils.c:3953
AVOption.
Definition: opt.h:246
int verify
Definition: tls.h:33
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int ffurl_write(URLContext *h, const unsigned char *buf, int size)
Write size bytes from buf to the resource accessed by h.
Definition: avio.c:421
static int url_bio_bwrite(BIO *b, const char *buf, int len)
Definition: tls_openssl.c:106
const char * b
Definition: vf_curves.c:113
Convenience header that includes libavutil's core.
int listen
Definition: tls.h:36
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
HMTX pthread_mutex_t
Definition: os2threads.h:49
static int url_bio_bread(BIO *b, char *buf, int len)
Definition: tls_openssl.c:94
uint8_t
AVOptions.
miscellaneous OS support macros and functions.
static int url_bio_bputs(BIO *b, const char *str)
Definition: tls_openssl.c:127
const URLProtocol ff_tls_openssl_protocol
Definition: tls_openssl.c:342
#define GET_BIO_DATA(x)
Definition: tls_openssl.c:91
Definition: tls.h:31
static int flags
Definition: log.c:57
#define AVERROR_EOF
End of file.
Definition: error.h:55
ptrdiff_t size
Definition: opengl_enc.c:101
static int tls_get_file_handle(URLContext *h)
Definition: tls_openssl.c:324
#define av_log(a,...)
SSL * ssl
Definition: tls_openssl.c:45
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
Definition: graph2dot.c:48
static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
Definition: tls_openssl.c:219
int avpriv_lock_avformat(void)
Definition: utils.c:3944
#define fail()
Definition: checkasm.h:89
char * host
Definition: tls.h:38
static const AVOption options[]
Definition: tls_openssl.c:330
void ff_openssl_deinit(void)
Definition: tls_openssl.c:176
static const AVClass tls_class
Definition: tls_openssl.c:335
#define TLS_COMMON_OPTIONS(pstruct, options_field)
Definition: tls.h:47
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:98
char * cert_file
Definition: tls.h:34
static int tls_write(URLContext *h, const uint8_t *buf, int size)
Definition: tls_openssl.c:313
#define pthread_mutex_unlock(a)
Definition: ffprobe.c:64
int ffurl_get_file_handle(URLContext *h)
Return the file descriptor associated with this URL.
Definition: avio.c:626
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
char * ca_file
Definition: tls.h:32
static int url_bio_destroy(BIO *b)
Definition: tls_openssl.c:83
static int print_tls_error(URLContext *h, int ret)
Definition: tls_openssl.c:194
SSL_CTX * ctx
Definition: tls_openssl.c:44
int ff_openssl_init(void)
Definition: tls_openssl.c:146
TLSShared tls_shared
Definition: tls_gnutls.c:46
void * buf
Definition: avisynth_c.h:690
Definition: url.h:38
GLint GLenum type
Definition: opengl_enc.c:105
static int tls_read(URLContext *h, uint8_t *buf, int size)
Definition: tls_openssl.c:302
Describe the class of an AVClass context structure.
Definition: log.h:67
void * priv_data
Definition: url.h:41
static int tls_close(URLContext *h)
Definition: tls_openssl.c:200
misc parsing utilities
const char * name
Definition: url.h:54
int ffurl_close(URLContext *h)
Definition: avio.c:467
Main libavformat public API header.
common internal api header.
int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
Definition: tls.c:56
static double c[64]
URLContext * tcp
Definition: tls.h:43
static BIO_METHOD url_bio_method
Definition: tls_openssl.c:133
int numerichost
Definition: tls.h:41
static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
Definition: tls_openssl.c:118
#define av_free(p)
int len
unbuffered private I/O API
#define av_malloc_array(a, b)
int ffurl_read(URLContext *h, unsigned char *buf, int size)
Read up to size bytes from the resource accessed by h, and store the read bytes in buf...
Definition: avio.c:407
mode
Use these values in ebur128_init (or'ed).
Definition: ebur128.h:83
char * key_file
Definition: tls.h:35
static int url_bio_create(BIO *b)
Definition: tls_openssl.c:69