Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / tls.c
... / ...
CommitLineData
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 "url.h"
24#include "libavutil/avstring.h"
25#include "libavutil/opt.h"
26#include "libavutil/parseutils.h"
27#include "network.h"
28#include "os_support.h"
29#include "internal.h"
30#if CONFIG_GNUTLS
31#include <gnutls/gnutls.h>
32#include <gnutls/x509.h>
33#define TLS_read(c, buf, size) gnutls_record_recv(c->session, buf, size)
34#define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
35#define TLS_shutdown(c) gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
36#define TLS_free(c) do { \
37 if (c->session) \
38 gnutls_deinit(c->session); \
39 if (c->cred) \
40 gnutls_certificate_free_credentials(c->cred); \
41 } while (0)
42#elif CONFIG_OPENSSL
43#include <openssl/bio.h>
44#include <openssl/ssl.h>
45#include <openssl/err.h>
46#define TLS_read(c, buf, size) SSL_read(c->ssl, buf, size)
47#define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
48#define TLS_shutdown(c) SSL_shutdown(c->ssl)
49#define TLS_free(c) do { \
50 if (c->ssl) \
51 SSL_free(c->ssl); \
52 if (c->ctx) \
53 SSL_CTX_free(c->ctx); \
54 } while (0)
55#endif
56#if HAVE_POLL_H
57#include <poll.h>
58#endif
59
60typedef struct {
61 const AVClass *class;
62 URLContext *tcp;
63#if CONFIG_GNUTLS
64 gnutls_session_t session;
65 gnutls_certificate_credentials_t cred;
66#elif CONFIG_OPENSSL
67 SSL_CTX *ctx;
68 SSL *ssl;
69#endif
70 int fd;
71 char *ca_file;
72 int verify;
73 char *cert_file;
74 char *key_file;
75 int listen;
76} TLSContext;
77
78#define OFFSET(x) offsetof(TLSContext, x)
79#define D AV_OPT_FLAG_DECODING_PARAM
80#define E AV_OPT_FLAG_ENCODING_PARAM
81static const AVOption options[] = {
82 {"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
83 {"cafile", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
84 {"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
85 {"cert_file", "Certificate file", OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E },
86 {"key_file", "Private key file", OFFSET(key_file), AV_OPT_TYPE_STRING, .flags = D|E },
87 {"listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
88 { NULL }
89};
90
91static const AVClass tls_class = {
92 .class_name = "tls",
93 .item_name = av_default_item_name,
94 .option = options,
95 .version = LIBAVUTIL_VERSION_INT,
96};
97
98static int do_tls_poll(URLContext *h, int ret)
99{
100 TLSContext *c = h->priv_data;
101 struct pollfd p = { c->fd, 0, 0 };
102#if CONFIG_GNUTLS
103 switch (ret) {
104 case GNUTLS_E_AGAIN:
105 case GNUTLS_E_INTERRUPTED:
106 break;
107 case GNUTLS_E_WARNING_ALERT_RECEIVED:
108 av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
109 break;
110 default:
111 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
112 return AVERROR(EIO);
113 }
114 if (gnutls_record_get_direction(c->session))
115 p.events = POLLOUT;
116 else
117 p.events = POLLIN;
118#elif CONFIG_OPENSSL
119 ret = SSL_get_error(c->ssl, ret);
120 if (ret == SSL_ERROR_WANT_READ) {
121 p.events = POLLIN;
122 } else if (ret == SSL_ERROR_WANT_WRITE) {
123 p.events = POLLOUT;
124 } else {
125 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
126 return AVERROR(EIO);
127 }
128#endif
129 if (h->flags & AVIO_FLAG_NONBLOCK)
130 return AVERROR(EAGAIN);
131 while (1) {
132 int n = poll(&p, 1, 100);
133 if (n > 0)
134 break;
135 if (ff_check_interrupt(&h->interrupt_callback))
136 return AVERROR(EINTR);
137 }
138 return 0;
139}
140
141static void set_options(URLContext *h, const char *uri)
142{
143 TLSContext *c = h->priv_data;
144 char buf[1024];
145 const char *p = strchr(uri, '?');
146 if (!p)
147 return;
148
149 if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p))
150 c->ca_file = av_strdup(buf);
151
152 if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {
153 char *endptr = NULL;
154 c->verify = strtol(buf, &endptr, 10);
155 if (buf == endptr)
156 c->verify = 1;
157 }
158
159 if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p))
160 c->cert_file = av_strdup(buf);
161
162 if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p))
163 c->key_file = av_strdup(buf);
164}
165
166static int tls_open(URLContext *h, const char *uri, int flags)
167{
168 TLSContext *c = h->priv_data;
169 int ret;
170 int port;
171 const char *p;
172 char buf[200], host[200], opts[50] = "";
173 int numerichost = 0;
174 struct addrinfo hints = { 0 }, *ai = NULL;
175 const char *proxy_path;
176 int use_proxy;
177
178 ff_tls_init();
179
180 if (c->listen)
181 snprintf(opts, sizeof(opts), "?listen=1");
182
183 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
184
185 p = strchr(uri, '?');
186
187 if (!p) {
188 p = opts;
189 } else {
190 if (av_find_info_tag(opts, sizeof(opts), "listen", p))
191 c->listen = 1;
192 }
193
194 ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", p);
195
196 hints.ai_flags = AI_NUMERICHOST;
197 if (!getaddrinfo(host, NULL, &hints, &ai)) {
198 numerichost = 1;
199 freeaddrinfo(ai);
200 }
201
202 proxy_path = getenv("http_proxy");
203 use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
204 proxy_path && av_strstart(proxy_path, "http://", NULL);
205
206 if (use_proxy) {
207 char proxy_host[200], proxy_auth[200], dest[200];
208 int proxy_port;
209 av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
210 proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
211 proxy_path);
212 ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
213 ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
214 proxy_port, "/%s", dest);
215 }
216
217 ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
218 &h->interrupt_callback, NULL);
219 if (ret)
220 goto fail;
221 c->fd = ffurl_get_file_handle(c->tcp);
222
223#if CONFIG_GNUTLS
224 gnutls_init(&c->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
225 if (!c->listen && !numerichost)
226 gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
227 gnutls_certificate_allocate_credentials(&c->cred);
228 set_options(h, uri);
229 if (c->ca_file) {
230 ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
231 if (ret < 0)
232 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
233 }
234#if GNUTLS_VERSION_MAJOR >= 3
235 else
236 gnutls_certificate_set_x509_system_trust(c->cred);
237#endif
238 gnutls_certificate_set_verify_flags(c->cred, c->verify ?
239 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
240 if (c->cert_file && c->key_file) {
241 ret = gnutls_certificate_set_x509_key_file(c->cred,
242 c->cert_file, c->key_file,
243 GNUTLS_X509_FMT_PEM);
244 if (ret < 0) {
245 av_log(h, AV_LOG_ERROR,
246 "Unable to set cert/key files %s and %s: %s\n",
247 c->cert_file, c->key_file, gnutls_strerror(ret));
248 ret = AVERROR(EIO);
249 goto fail;
250 }
251 } else if (c->cert_file || c->key_file)
252 av_log(h, AV_LOG_ERROR, "cert and key required\n");
253 gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
254 gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
255 (intptr_t) c->fd);
256 gnutls_priority_set_direct(c->session, "NORMAL", NULL);
257 while (1) {
258 ret = gnutls_handshake(c->session);
259 if (ret == 0)
260 break;
261 if ((ret = do_tls_poll(h, ret)) < 0)
262 goto fail;
263 }
264 if (c->verify) {
265 unsigned int status, cert_list_size;
266 gnutls_x509_crt_t cert;
267 const gnutls_datum_t *cert_list;
268 if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {
269 av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
270 gnutls_strerror(ret));
271 ret = AVERROR(EIO);
272 goto fail;
273 }
274 if (status & GNUTLS_CERT_INVALID) {
275 av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
276 ret = AVERROR(EIO);
277 goto fail;
278 }
279 if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {
280 av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
281 ret = AVERROR(EIO);
282 goto fail;
283 }
284 gnutls_x509_crt_init(&cert);
285 cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);
286 gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
287 ret = gnutls_x509_crt_check_hostname(cert, host);
288 gnutls_x509_crt_deinit(cert);
289 if (!ret) {
290 av_log(h, AV_LOG_ERROR,
291 "The certificate's owner does not match hostname %s\n", host);
292 ret = AVERROR(EIO);
293 goto fail;
294 }
295 }
296#elif CONFIG_OPENSSL
297 c->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());
298 if (!c->ctx) {
299 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
300 ret = AVERROR(EIO);
301 goto fail;
302 }
303 set_options(h, uri);
304 if (c->ca_file) {
305 if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL))
306 av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
307 }
308 if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) {
309 av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
310 c->cert_file, ERR_error_string(ERR_get_error(), NULL));
311 ret = AVERROR(EIO);
312 goto fail;
313 }
314 if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) {
315 av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
316 c->key_file, ERR_error_string(ERR_get_error(), NULL));
317 ret = AVERROR(EIO);
318 goto fail;
319 }
320 // Note, this doesn't check that the peer certificate actually matches
321 // the requested hostname.
322 if (c->verify)
323 SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
324 c->ssl = SSL_new(c->ctx);
325 if (!c->ssl) {
326 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
327 ret = AVERROR(EIO);
328 goto fail;
329 }
330 SSL_set_fd(c->ssl, c->fd);
331 if (!c->listen && !numerichost)
332 SSL_set_tlsext_host_name(c->ssl, host);
333 while (1) {
334 ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
335 if (ret > 0)
336 break;
337 if (ret == 0) {
338 av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
339 ret = AVERROR(EIO);
340 goto fail;
341 }
342 if ((ret = do_tls_poll(h, ret)) < 0)
343 goto fail;
344 }
345#endif
346 return 0;
347fail:
348 TLS_free(c);
349 if (c->tcp)
350 ffurl_close(c->tcp);
351 ff_tls_deinit();
352 return ret;
353}
354
355static int tls_read(URLContext *h, uint8_t *buf, int size)
356{
357 TLSContext *c = h->priv_data;
358 while (1) {
359 int ret = TLS_read(c, buf, size);
360 if (ret > 0)
361 return ret;
362 if (ret == 0)
363 return AVERROR_EOF;
364 if ((ret = do_tls_poll(h, ret)) < 0)
365 return ret;
366 }
367 return 0;
368}
369
370static int tls_write(URLContext *h, const uint8_t *buf, int size)
371{
372 TLSContext *c = h->priv_data;
373 while (1) {
374 int ret = TLS_write(c, buf, size);
375 if (ret > 0)
376 return ret;
377 if (ret == 0)
378 return AVERROR_EOF;
379 if ((ret = do_tls_poll(h, ret)) < 0)
380 return ret;
381 }
382 return 0;
383}
384
385static int tls_close(URLContext *h)
386{
387 TLSContext *c = h->priv_data;
388 TLS_shutdown(c);
389 TLS_free(c);
390 ffurl_close(c->tcp);
391 ff_tls_deinit();
392 return 0;
393}
394
395URLProtocol ff_tls_protocol = {
396 .name = "tls",
397 .url_open = tls_open,
398 .url_read = tls_read,
399 .url_write = tls_write,
400 .url_close = tls_close,
401 .priv_data_size = sizeof(TLSContext),
402 .flags = URL_PROTOCOL_FLAG_NETWORK,
403 .priv_data_class = &tls_class,
404};