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
22 #include <gnutls/gnutls.h>
23 #include <gnutls/x509.h>
28 #include "os_support.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/parseutils.h"
35 typedef struct TLSContext {
38 gnutls_session_t session;
39 gnutls_certificate_credentials_t cred;
43 static int print_tls_error(URLContext *h, int ret)
47 case GNUTLS_E_INTERRUPTED:
49 case GNUTLS_E_WARNING_ALERT_RECEIVED:
50 av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
53 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
59 static int tls_close(URLContext *h)
61 TLSContext *c = h->priv_data;
63 gnutls_bye(c->session, GNUTLS_SHUT_RDWR);
65 gnutls_deinit(c->session);
67 gnutls_certificate_free_credentials(c->cred);
68 if (c->tls_shared.tcp)
69 ffurl_close(c->tls_shared.tcp);
74 static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
75 void *buf, size_t len)
77 URLContext *h = (URLContext*) transport;
78 int ret = ffurl_read(h, buf, len);
81 if (ret == AVERROR_EXIT)
87 static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
88 const void *buf, size_t len)
90 URLContext *h = (URLContext*) transport;
91 int ret = ffurl_write(h, buf, len);
94 if (ret == AVERROR_EXIT)
100 static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
102 TLSContext *p = h->priv_data;
103 TLSShared *c = &p->tls_shared;
108 if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
111 gnutls_init(&p->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
112 if (!c->listen && !c->numerichost)
113 gnutls_server_name_set(p->session, GNUTLS_NAME_DNS, c->host, strlen(c->host));
114 gnutls_certificate_allocate_credentials(&p->cred);
116 gnutls_certificate_set_x509_trust_file(p->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
117 #if GNUTLS_VERSION_MAJOR >= 3
119 gnutls_certificate_set_x509_system_trust(p->cred);
121 gnutls_certificate_set_verify_flags(p->cred, c->verify ?
122 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
123 if (c->cert_file && c->key_file) {
124 ret = gnutls_certificate_set_x509_key_file(p->cred,
125 c->cert_file, c->key_file,
126 GNUTLS_X509_FMT_PEM);
128 av_log(h, AV_LOG_ERROR,
129 "Unable to set cert/key files %s and %s: %s\n",
130 c->cert_file, c->key_file, gnutls_strerror(ret));
135 gnutls_credentials_set(p->session, GNUTLS_CRD_CERTIFICATE, p->cred);
136 gnutls_transport_set_pull_function(p->session, gnutls_url_pull);
137 gnutls_transport_set_push_function(p->session, gnutls_url_push);
138 gnutls_transport_set_ptr(p->session, c->tcp);
139 gnutls_priority_set_direct(p->session, "NORMAL", NULL);
140 ret = gnutls_handshake(p->session);
142 ret = print_tls_error(h, ret);
145 p->need_shutdown = 1;
147 unsigned int status, cert_list_size;
148 gnutls_x509_crt_t cert;
149 const gnutls_datum_t *cert_list;
150 if ((ret = gnutls_certificate_verify_peers2(p->session, &status)) < 0) {
151 av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
152 gnutls_strerror(ret));
156 if (status & GNUTLS_CERT_INVALID) {
157 av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
161 if (gnutls_certificate_type_get(p->session) != GNUTLS_CRT_X509) {
162 av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
166 gnutls_x509_crt_init(&cert);
167 cert_list = gnutls_certificate_get_peers(p->session, &cert_list_size);
168 gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
169 ret = gnutls_x509_crt_check_hostname(cert, c->host);
170 gnutls_x509_crt_deinit(cert);
172 av_log(h, AV_LOG_ERROR,
173 "The certificate's owner does not match hostname %s\n", c->host);
185 static int tls_read(URLContext *h, uint8_t *buf, int size)
187 TLSContext *c = h->priv_data;
188 int ret = gnutls_record_recv(c->session, buf, size);
193 return print_tls_error(h, ret);
196 static int tls_write(URLContext *h, const uint8_t *buf, int size)
198 TLSContext *c = h->priv_data;
199 int ret = gnutls_record_send(c->session, buf, size);
204 return print_tls_error(h, ret);
207 static const AVOption options[] = {
208 TLS_COMMON_OPTIONS(TLSContext, tls_shared),
212 static const AVClass tls_class = {
214 .item_name = av_default_item_name,
216 .version = LIBAVUTIL_VERSION_INT,
219 URLProtocol ff_tls_gnutls_protocol = {
221 .url_open2 = tls_open,
222 .url_read = tls_read,
223 .url_write = tls_write,
224 .url_close = tls_close,
225 .priv_data_size = sizeof(TLSContext),
226 .flags = URL_PROTOCOL_FLAG_NETWORK,
227 .priv_data_class = &tls_class,