summaryrefslogtreecommitdiff
path: root/libavformat/tls_gnutls.c (plain)
blob: ecc80bfac3f05b2b8949e3e54271bb82578aba98
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 <errno.h>
23
24#include <gnutls/gnutls.h>
25#include <gnutls/x509.h>
26
27#include "avformat.h"
28#include "internal.h"
29#include "network.h"
30#include "os_support.h"
31#include "url.h"
32#include "tls.h"
33#include "libavcodec/internal.h"
34#include "libavutil/avstring.h"
35#include "libavutil/opt.h"
36#include "libavutil/parseutils.h"
37
38#if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
39#include <gcrypt.h>
40#include "libavutil/thread.h"
41GCRY_THREAD_OPTION_PTHREAD_IMPL;
42#endif
43
44typedef struct TLSContext {
45 const AVClass *class;
46 TLSShared tls_shared;
47 gnutls_session_t session;
48 gnutls_certificate_credentials_t cred;
49 int need_shutdown;
50} TLSContext;
51
52void ff_gnutls_init(void)
53{
54 avpriv_lock_avformat();
55#if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
56 if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
57 gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
58#endif
59 gnutls_global_init();
60 avpriv_unlock_avformat();
61}
62
63void ff_gnutls_deinit(void)
64{
65 avpriv_lock_avformat();
66 gnutls_global_deinit();
67 avpriv_unlock_avformat();
68}
69
70static int print_tls_error(URLContext *h, int ret)
71{
72 switch (ret) {
73 case GNUTLS_E_AGAIN:
74 case GNUTLS_E_INTERRUPTED:
75 break;
76 case GNUTLS_E_WARNING_ALERT_RECEIVED:
77 av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
78 break;
79 default:
80 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
81 break;
82 }
83 return AVERROR(EIO);
84}
85
86static int tls_close(URLContext *h)
87{
88 TLSContext *c = h->priv_data;
89 if (c->need_shutdown)
90 gnutls_bye(c->session, GNUTLS_SHUT_WR);
91 if (c->session)
92 gnutls_deinit(c->session);
93 if (c->cred)
94 gnutls_certificate_free_credentials(c->cred);
95 if (c->tls_shared.tcp)
96 ffurl_close(c->tls_shared.tcp);
97 ff_gnutls_deinit();
98 return 0;
99}
100
101static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
102 void *buf, size_t len)
103{
104 URLContext *h = (URLContext*) transport;
105 int ret = ffurl_read(h, buf, len);
106 if (ret >= 0)
107 return ret;
108 if (ret == AVERROR_EXIT)
109 return 0;
110 errno = EIO;
111 return -1;
112}
113
114static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
115 const void *buf, size_t len)
116{
117 URLContext *h = (URLContext*) transport;
118 int ret = ffurl_write(h, buf, len);
119 if (ret >= 0)
120 return ret;
121 if (ret == AVERROR_EXIT)
122 return 0;
123 errno = EIO;
124 return -1;
125}
126
127static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
128{
129 TLSContext *p = h->priv_data;
130 TLSShared *c = &p->tls_shared;
131 int ret;
132
133 ff_gnutls_init();
134
135 if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
136 goto fail;
137
138 gnutls_init(&p->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
139 if (!c->listen && !c->numerichost)
140 gnutls_server_name_set(p->session, GNUTLS_NAME_DNS, c->host, strlen(c->host));
141 gnutls_certificate_allocate_credentials(&p->cred);
142 if (c->ca_file) {
143 ret = gnutls_certificate_set_x509_trust_file(p->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
144 if (ret < 0)
145 av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
146 }
147#if GNUTLS_VERSION_NUMBER >= 0x030020
148 else
149 gnutls_certificate_set_x509_system_trust(p->cred);
150#endif
151 gnutls_certificate_set_verify_flags(p->cred, c->verify ?
152 GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
153 if (c->cert_file && c->key_file) {
154 ret = gnutls_certificate_set_x509_key_file(p->cred,
155 c->cert_file, c->key_file,
156 GNUTLS_X509_FMT_PEM);
157 if (ret < 0) {
158 av_log(h, AV_LOG_ERROR,
159 "Unable to set cert/key files %s and %s: %s\n",
160 c->cert_file, c->key_file, gnutls_strerror(ret));
161 ret = AVERROR(EIO);
162 goto fail;
163 }
164 } else if (c->cert_file || c->key_file)
165 av_log(h, AV_LOG_ERROR, "cert and key required\n");
166 gnutls_credentials_set(p->session, GNUTLS_CRD_CERTIFICATE, p->cred);
167 gnutls_transport_set_pull_function(p->session, gnutls_url_pull);
168 gnutls_transport_set_push_function(p->session, gnutls_url_push);
169 gnutls_transport_set_ptr(p->session, c->tcp);
170 gnutls_priority_set_direct(p->session, "NORMAL", NULL);
171 ret = gnutls_handshake(p->session);
172 if (ret) {
173 ret = print_tls_error(h, ret);
174 goto fail;
175 }
176 p->need_shutdown = 1;
177 if (c->verify) {
178 unsigned int status, cert_list_size;
179 gnutls_x509_crt_t cert;
180 const gnutls_datum_t *cert_list;
181 if ((ret = gnutls_certificate_verify_peers2(p->session, &status)) < 0) {
182 av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
183 gnutls_strerror(ret));
184 ret = AVERROR(EIO);
185 goto fail;
186 }
187 if (status & GNUTLS_CERT_INVALID) {
188 av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
189 ret = AVERROR(EIO);
190 goto fail;
191 }
192 if (gnutls_certificate_type_get(p->session) != GNUTLS_CRT_X509) {
193 av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
194 ret = AVERROR(EIO);
195 goto fail;
196 }
197 gnutls_x509_crt_init(&cert);
198 cert_list = gnutls_certificate_get_peers(p->session, &cert_list_size);
199 gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
200 ret = gnutls_x509_crt_check_hostname(cert, c->host);
201 gnutls_x509_crt_deinit(cert);
202 if (!ret) {
203 av_log(h, AV_LOG_ERROR,
204 "The certificate's owner does not match hostname %s\n", c->host);
205 ret = AVERROR(EIO);
206 goto fail;
207 }
208 }
209
210 return 0;
211fail:
212 tls_close(h);
213 return ret;
214}
215
216static int tls_read(URLContext *h, uint8_t *buf, int size)
217{
218 TLSContext *c = h->priv_data;
219 int ret = gnutls_record_recv(c->session, buf, size);
220 if (ret > 0)
221 return ret;
222 if (ret == 0)
223 return AVERROR_EOF;
224 return print_tls_error(h, ret);
225}
226
227static int tls_write(URLContext *h, const uint8_t *buf, int size)
228{
229 TLSContext *c = h->priv_data;
230 int ret = gnutls_record_send(c->session, buf, size);
231 if (ret > 0)
232 return ret;
233 if (ret == 0)
234 return AVERROR_EOF;
235 return print_tls_error(h, ret);
236}
237
238static int tls_get_file_handle(URLContext *h)
239{
240 TLSContext *c = h->priv_data;
241 return ffurl_get_file_handle(c->tls_shared.tcp);
242}
243
244static const AVOption options[] = {
245 TLS_COMMON_OPTIONS(TLSContext, tls_shared),
246 { NULL }
247};
248
249static const AVClass tls_class = {
250 .class_name = "tls",
251 .item_name = av_default_item_name,
252 .option = options,
253 .version = LIBAVUTIL_VERSION_INT,
254};
255
256const URLProtocol ff_tls_gnutls_protocol = {
257 .name = "tls",
258 .url_open2 = tls_open,
259 .url_read = tls_read,
260 .url_write = tls_write,
261 .url_close = tls_close,
262 .url_get_file_handle = tls_get_file_handle,
263 .priv_data_size = sizeof(TLSContext),
264 .flags = URL_PROTOCOL_FLAG_NETWORK,
265 .priv_data_class = &tls_class,
266};
267
generated by cgit at 2024-05-17 03:42:19 (GMT)