3 * Copyright (c) 2011 Martin Storsjo
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/avstring.h"
25 #include "libavutil/opt.h"
27 #include <gnutls/gnutls.h>
28 #include <gnutls/x509.h>
29 #define TLS_read(c, buf, size) gnutls_record_recv(c->session, buf, size)
30 #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
31 #define TLS_shutdown(c) gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
32 #define TLS_free(c) do { \
34 gnutls_deinit(c->session); \
36 gnutls_certificate_free_credentials(c->cred); \
39 #include <openssl/bio.h>
40 #include <openssl/ssl.h>
41 #include <openssl/err.h>
42 #define TLS_read(c, buf, size) SSL_read(c->ssl, buf, size)
43 #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
44 #define TLS_shutdown(c) SSL_shutdown(c->ssl)
45 #define TLS_free(c) do { \
49 SSL_CTX_free(c->ctx); \
53 #include "os_support.h"
63 gnutls_session_t session;
64 gnutls_certificate_credentials_t cred;
74 #define OFFSET(x) offsetof(TLSContext, x)
75 #define D AV_OPT_FLAG_DECODING_PARAM
76 #define E AV_OPT_FLAG_ENCODING_PARAM
77 static const AVOption options[] = {
78 {"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
79 {"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
83 static const AVClass tls_class = {
85 .item_name = av_default_item_name,
87 .version = LIBAVUTIL_VERSION_INT,
90 static int do_tls_poll(URLContext *h, int ret)
92 TLSContext *c = h->priv_data;
93 struct pollfd p = { c->fd, 0, 0 };
97 case GNUTLS_E_INTERRUPTED:
99 case GNUTLS_E_WARNING_ALERT_RECEIVED:
100 av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
103 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
106 if (gnutls_record_get_direction(c->session))
111 ret = SSL_get_error(c->ssl, ret);
112 if (ret == SSL_ERROR_WANT_READ) {
114 } else if (ret == SSL_ERROR_WANT_WRITE) {
117 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
121 if (h->flags & AVIO_FLAG_NONBLOCK)
122 return AVERROR(EAGAIN);
124 int n = poll(&p, 1, 100);
127 if (ff_check_interrupt(&h->interrupt_callback))
128 return AVERROR(EINTR);
133 static int tls_open(URLContext *h, const char *uri, int flags)
135 TLSContext *c = h->priv_data;
138 char buf[200], host[200];
140 struct addrinfo hints = { 0 }, *ai = NULL;
141 const char *proxy_path;
146 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
147 ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, NULL);
149 hints.ai_flags = AI_NUMERICHOST;
150 if (!getaddrinfo(host, NULL, &hints, &ai)) {
155 proxy_path = getenv("http_proxy");
156 use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
157 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
160 char proxy_host[200], proxy_auth[200], dest[200];
162 av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
163 proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
165 ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
166 ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
167 proxy_port, "/%s", dest);
170 ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
171 &h->interrupt_callback, NULL);
174 c->fd = ffurl_get_file_handle(c->tcp);
177 gnutls_init(&c->session, GNUTLS_CLIENT);
179 gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
180 gnutls_certificate_allocate_credentials(&c->cred);
182 gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
183 #if GNUTLS_VERSION_MAJOR >= 3
185 gnutls_certificate_set_x509_system_trust(c->cred);
187 gnutls_certificate_set_verify_flags(c->cred, c->verify ?
188 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
189 gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
190 gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
192 gnutls_priority_set_direct(c->session, "NORMAL", NULL);
194 ret = gnutls_handshake(c->session);
197 if ((ret = do_tls_poll(h, ret)) < 0)
201 unsigned int status, cert_list_size;
202 gnutls_x509_crt_t cert;
203 const gnutls_datum_t *cert_list;
204 if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {
205 av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
206 gnutls_strerror(ret));
210 if (status & GNUTLS_CERT_INVALID) {
211 av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
215 if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {
216 av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
220 gnutls_x509_crt_init(&cert);
221 cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);
222 gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
223 ret = gnutls_x509_crt_check_hostname(cert, host);
224 gnutls_x509_crt_deinit(cert);
226 av_log(h, AV_LOG_ERROR,
227 "The certificate's owner does not match hostname %s\n", host);
233 c->ctx = SSL_CTX_new(TLSv1_client_method());
235 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
240 SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL);
241 // Note, this doesn't check that the peer certificate actually matches
242 // the requested hostname.
244 SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER, NULL);
245 c->ssl = SSL_new(c->ctx);
247 av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
251 SSL_set_fd(c->ssl, c->fd);
253 SSL_set_tlsext_host_name(c->ssl, host);
255 ret = SSL_connect(c->ssl);
259 av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
263 if ((ret = do_tls_poll(h, ret)) < 0)
276 static int tls_read(URLContext *h, uint8_t *buf, int size)
278 TLSContext *c = h->priv_data;
280 int ret = TLS_read(c, buf, size);
285 if ((ret = do_tls_poll(h, ret)) < 0)
291 static int tls_write(URLContext *h, const uint8_t *buf, int size)
293 TLSContext *c = h->priv_data;
295 int ret = TLS_write(c, buf, size);
300 if ((ret = do_tls_poll(h, ret)) < 0)
306 static int tls_close(URLContext *h)
308 TLSContext *c = h->priv_data;
316 URLProtocol ff_tls_protocol = {
318 .url_open = tls_open,
319 .url_read = tls_read,
320 .url_write = tls_write,
321 .url_close = tls_close,
322 .priv_data_size = sizeof(TLSContext),
323 .flags = URL_PROTOCOL_FLAG_NETWORK,
324 .priv_data_class = &tls_class,