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lavf: split tls.c 

Move the OpenSSL and GnuTLS implementations to their own files. Other
than the connection code (including options) and some boilerplate, no
code is actually shared.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tags/n2.7
wm4 Michael Niedermayer 10 years ago
parent
07fc47909f
commit
4a006b9eb7
8 changed files with 548 additions and 375 deletions
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  1. +3
    -1
      configure
  2. +2
    -1
      libavformat/Makefile
  3. +2
    -1
      libavformat/allformats.c
  4. +1
    -0
      libavformat/rtspdec.c
  5. +16
    -372
      libavformat/tls.c
  6. +55
    -0
      libavformat/tls.h
  7. +233
    -0
      libavformat/tls_gnutls.c
  8. +236
    -0
      libavformat/tls_openssl.c

+ 3
- 1
configure View File

@@ -2634,7 +2634,9 @@ sctp_protocol_deps="struct_sctp_event_subscribe"
sctp_protocol_select="network"
srtp_protocol_select="rtp_protocol"
tcp_protocol_select="network"
tls_protocol_deps_any="openssl gnutls"
tls_gnutls_protocol_deps="gnutls"
tls_openssl_protocol_deps="openssl !tls_gnutls_protocol"
tls_protocol_deps_any="tls_gnutls_protocol tls_openssl_protocol"
tls_protocol_select="tcp_protocol"
udp_protocol_select="network"
udplite_protocol_select="network"


+ 2
- 1
libavformat/Makefile View File

@@ -521,7 +521,8 @@ OBJS-$(CONFIG_SCTP_PROTOCOL) += sctp.o
OBJS-$(CONFIG_SRTP_PROTOCOL) += srtpproto.o srtp.o
OBJS-$(CONFIG_SUBFILE_PROTOCOL) += subfile.o
OBJS-$(CONFIG_TCP_PROTOCOL) += tcp.o
OBJS-$(CONFIG_TLS_PROTOCOL) += tls.o
OBJS-$(CONFIG_TLS_GNUTLS_PROTOCOL) += tls_gnutls.o tls.o
OBJS-$(CONFIG_TLS_OPENSSL_PROTOCOL) += tls_openssl.o tls.o
OBJS-$(CONFIG_UDP_PROTOCOL) += udp.o
OBJS-$(CONFIG_UDPLITE_PROTOCOL) += udp.o
OBJS-$(CONFIG_UNIX_PROTOCOL) += unix.o


+ 2
- 1
libavformat/allformats.c View File

@@ -377,7 +377,8 @@ void av_register_all(void)
REGISTER_PROTOCOL(SRTP, srtp);
REGISTER_PROTOCOL(SUBFILE, subfile);
REGISTER_PROTOCOL(TCP, tcp);
REGISTER_PROTOCOL(TLS, tls);
REGISTER_PROTOCOL(TLS_GNUTLS, tls_gnutls);
REGISTER_PROTOCOL(TLS_OPENSSL, tls_openssl);
REGISTER_PROTOCOL(UDP, udp);
REGISTER_PROTOCOL(UDPLITE, udplite);
REGISTER_PROTOCOL(UNIX, unix);


+ 1
- 0
libavformat/rtspdec.c View File

@@ -32,6 +32,7 @@
#include "rtpproto.h"
#include "rtsp.h"
#include "rdt.h"
#include "tls.h"
#include "url.h"

static const struct RTSPStatusMessage {


+ 16
- 372
libavformat/tls.c View File

@@ -20,192 +20,17 @@
*/

#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#include "tls.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "network.h"
#include "os_support.h"
#include "internal.h"
#if CONFIG_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#define TLS_read(c, buf, size) gnutls_record_recv((c)->session, (buf), (size))
#define TLS_write(c, buf, size) gnutls_record_send((c)->session, (buf), (size))
#define TLS_shutdown(c) gnutls_bye((c)->session, GNUTLS_SHUT_RDWR)
#define TLS_free(c) do { \
if ((c)->session) \
gnutls_deinit((c)->session); \
if ((c)->cred) \
gnutls_certificate_free_credentials((c)->cred); \
} while (0)

static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
void *buf, size_t len)
{
URLContext *h = (URLContext*) transport;
int ret = ffurl_read(h, buf, len);
if (ret >= 0)
return ret;
if (ret == AVERROR_EXIT)
return 0;
errno = EIO;
return -1;
}
static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
const void *buf, size_t len)
{
URLContext *h = (URLContext*) transport;
int ret = ffurl_write(h, buf, len);
if (ret >= 0)
return ret;
if (ret == AVERROR_EXIT)
return 0;
errno = EIO;
return -1;
}
#elif CONFIG_OPENSSL
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#define TLS_read(c, buf, size) SSL_read((c)->ssl, (buf), (size))
#define TLS_write(c, buf, size) SSL_write((c)->ssl, (buf), (size))
#define TLS_shutdown(c) SSL_shutdown((c)->ssl)
#define TLS_free(c) do { \
if ((c)->ssl) \
SSL_free((c)->ssl); \
if ((c)->ctx) \
SSL_CTX_free((c)->ctx); \
} while (0)

static int url_bio_create(BIO *b)
{
b->init = 1;
b->ptr = NULL;
b->flags = 0;
return 1;
}

static int url_bio_destroy(BIO *b)
{
return 1;
}

static int url_bio_bread(BIO *b, char *buf, int len)
{
URLContext *h = b->ptr;
int ret = ffurl_read(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR_EXIT)
return 0;
return -1;
}

static int url_bio_bwrite(BIO *b, const char *buf, int len)
{
URLContext *h = b->ptr;
int ret = ffurl_write(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR_EXIT)
return 0;
return -1;
}

static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
static void set_options(TLSShared *c, const char *uri)
{
if (cmd == BIO_CTRL_FLUSH) {
BIO_clear_retry_flags(b);
return 1;
}
return 0;
}

static int url_bio_bputs(BIO *b, const char *str)
{
return url_bio_bwrite(b, str, strlen(str));
}

static BIO_METHOD url_bio_method = {
.type = BIO_TYPE_SOURCE_SINK,
.name = "urlprotocol bio",
.bwrite = url_bio_bwrite,
.bread = url_bio_bread,
.bputs = url_bio_bputs,
.bgets = NULL,
.ctrl = url_bio_ctrl,
.create = url_bio_create,
.destroy = url_bio_destroy,
};

#endif
#if HAVE_POLL_H
#include <poll.h>
#endif

typedef struct TLSContext {
const AVClass *class;
URLContext *tcp;
#if CONFIG_GNUTLS
gnutls_session_t session;
gnutls_certificate_credentials_t cred;
#elif CONFIG_OPENSSL
SSL_CTX *ctx;
SSL *ssl;
#endif
char *ca_file;
int verify;
char *cert_file;
char *key_file;
int listen;
} TLSContext;

#define OFFSET(x) offsetof(TLSContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
{"cafile", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
{"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
{"cert_file", "Certificate file", OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E },
{"key_file", "Private key file", OFFSET(key_file), AV_OPT_TYPE_STRING, .flags = D|E },
{"listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
{ NULL }
};

static const AVClass tls_class = {
.class_name = "tls",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};

static int print_tls_error(URLContext *h, int ret)
{
#if CONFIG_GNUTLS
switch (ret) {
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
break;
case GNUTLS_E_WARNING_ALERT_RECEIVED:
av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
break;
default:
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
break;
}
#elif CONFIG_OPENSSL
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
#endif
return AVERROR(EIO);
}

static void set_options(URLContext *h, const char *uri)
{
TLSContext *c = h->priv_data;
char buf[1024];
const char *p = strchr(uri, '?');
if (!p)
@@ -228,28 +53,21 @@ static void set_options(URLContext *h, const char *uri)
c->key_file = av_strdup(buf);
}

static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
{
TLSContext *c = h->priv_data;
int ret;
int port;
const char *p;
char buf[200], host[200], opts[50] = "";
int numerichost = 0;
char buf[200], opts[50] = "";
struct addrinfo hints = { 0 }, *ai = NULL;
const char *proxy_path;
int use_proxy;
#if CONFIG_OPENSSL && !CONFIG_GNUTLS
BIO *bio;
#endif

if ((ret = ff_tls_init()) < 0)
return ret;
set_options(c, uri);

if (c->listen)
snprintf(opts, sizeof(opts), "?listen=1");

av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
av_url_split(NULL, 0, NULL, 0, c->host, sizeof(c->host), &port, NULL, 0, uri);

p = strchr(uri, '?');

@@ -260,16 +78,16 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
c->listen = 1;
}

ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", p);
ff_url_join(buf, sizeof(buf), "tcp", NULL, c->host, port, "%s", p);

hints.ai_flags = AI_NUMERICHOST;
if (!getaddrinfo(host, NULL, &hints, &ai)) {
numerichost = 1;
if (!getaddrinfo(c->host, NULL, &hints, &ai)) {
c->numerichost = 1;
freeaddrinfo(ai);
}

proxy_path = getenv("http_proxy");
use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), c->host) &&
proxy_path && av_strstart(proxy_path, "http://", NULL);

if (use_proxy) {
@@ -278,185 +96,11 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
proxy_path);
ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
ff_url_join(dest, sizeof(dest), NULL, NULL, c->host, port, NULL);
ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
proxy_port, "/%s", dest);
}

ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, options);
if (ret)
goto fail;

#if CONFIG_GNUTLS
gnutls_init(&c->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
if (!c->listen && !numerichost)
gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
gnutls_certificate_allocate_credentials(&c->cred);
set_options(h, uri);
if (c->ca_file) {
ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
if (ret < 0)
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
}
#if GNUTLS_VERSION_MAJOR >= 3
else
gnutls_certificate_set_x509_system_trust(c->cred);
#endif
gnutls_certificate_set_verify_flags(c->cred, c->verify ?
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
if (c->cert_file && c->key_file) {
ret = gnutls_certificate_set_x509_key_file(c->cred,
c->cert_file, c->key_file,
GNUTLS_X509_FMT_PEM);
if (ret < 0) {
av_log(h, AV_LOG_ERROR,
"Unable to set cert/key files %s and %s: %s\n",
c->cert_file, c->key_file, gnutls_strerror(ret));
ret = AVERROR(EIO);
goto fail;
}
} else if (c->cert_file || c->key_file)
av_log(h, AV_LOG_ERROR, "cert and key required\n");
gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
gnutls_transport_set_pull_function(c->session, gnutls_url_pull);
gnutls_transport_set_push_function(c->session, gnutls_url_push);
gnutls_transport_set_ptr(c->session, c->tcp);
gnutls_priority_set_direct(c->session, "NORMAL", NULL);
ret = gnutls_handshake(c->session);
if (ret) {
ret = print_tls_error(h, ret);
goto fail;
}
if (c->verify) {
unsigned int status, cert_list_size;
gnutls_x509_crt_t cert;
const gnutls_datum_t *cert_list;
if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {
av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
gnutls_strerror(ret));
ret = AVERROR(EIO);
goto fail;
}
if (status & GNUTLS_CERT_INVALID) {
av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
ret = AVERROR(EIO);
goto fail;
}
if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {
av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
ret = AVERROR(EIO);
goto fail;
}
gnutls_x509_crt_init(&cert);
cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);
gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
ret = gnutls_x509_crt_check_hostname(cert, host);
gnutls_x509_crt_deinit(cert);
if (!ret) {
av_log(h, AV_LOG_ERROR,
"The certificate's owner does not match hostname %s\n", host);
ret = AVERROR(EIO);
goto fail;
}
}
#elif CONFIG_OPENSSL
c->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());
if (!c->ctx) {
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
set_options(h, uri);
if (c->ca_file) {
if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL))
av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
}
if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) {
av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
c->cert_file, ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) {
av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
c->key_file, ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
// Note, this doesn't check that the peer certificate actually matches
// the requested hostname.
if (c->verify)
SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
c->ssl = SSL_new(c->ctx);
if (!c->ssl) {
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
bio = BIO_new(&url_bio_method);
bio->ptr = c->tcp;
SSL_set_bio(c->ssl, bio, bio);
if (!c->listen && !numerichost)
SSL_set_tlsext_host_name(c->ssl, host);
ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
if (ret == 0) {
av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
ret = AVERROR(EIO);
goto fail;
} else if (ret < 0) {
ret = print_tls_error(h, ret);
goto fail;
}
#endif
return 0;
fail:
TLS_free(c);
if (c->tcp)
ffurl_close(c->tcp);
ff_tls_deinit();
return ret;
}

static int tls_read(URLContext *h, uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = TLS_read(c, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
return ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
&parent->interrupt_callback, options);
}

static int tls_write(URLContext *h, const uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = TLS_write(c, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
}

static int tls_close(URLContext *h)
{
TLSContext *c = h->priv_data;
TLS_shutdown(c);
TLS_free(c);
ffurl_close(c->tcp);
ff_tls_deinit();
return 0;
}

URLProtocol ff_tls_protocol = {
.name = "tls",
.url_open2 = tls_open,
.url_read = tls_read,
.url_write = tls_write,
.url_close = tls_close,
.priv_data_size = sizeof(TLSContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &tls_class,
};

+ 55
- 0
libavformat/tls.h View File

@@ -0,0 +1,55 @@
/*
* TLS/SSL Protocol
* Copyright (c) 2011 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AVFORMAT_TLS_H
#define AVFORMAT_TLS_H

#include "config.h"
#include "url.h"
#include "libavutil/opt.h"

#define CONFIG_TLS_PROTOCOL (CONFIG_TLS_GNUTLS_PROTOCOL | CONFIG_TLS_OPENSSL_PROTOCOL)

typedef struct TLSShared {
char *ca_file;
int verify;
char *cert_file;
char *key_file;
int listen;

char host[200];
int numerichost;

URLContext *tcp;
} TLSShared;

#define TLS_OPTFL (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
#define TLS_COMMON_OPTIONS(pstruct, options_field) \
{"ca_file", "Certificate Authority database file", offsetof(pstruct, options_field . ca_file), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
{"cafile", "Certificate Authority database file", offsetof(pstruct, options_field . ca_file), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
{"tls_verify", "Verify the peer certificate", offsetof(pstruct, options_field . verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = TLS_OPTFL }, \
{"cert_file", "Certificate file", offsetof(pstruct, options_field . cert_file), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
{"key_file", "Private key file", offsetof(pstruct, options_field . key_file), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
{"listen", "Listen for incoming connections", offsetof(pstruct, options_field . listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = TLS_OPTFL }

int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options);

#endif /* AVFORMAT_TLS_H */

+ 233
- 0
libavformat/tls_gnutls.c View File

@@ -0,0 +1,233 @@
/*
* TLS/SSL Protocol
* Copyright (c) 2011 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include <gnutls/gnutls.h>
#include <gnutls/x509.h>

#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#include "tls.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"

typedef struct TLSContext {
const AVClass *class;
TLSShared tls_shared;
gnutls_session_t session;
gnutls_certificate_credentials_t cred;
int need_shutdown;
} TLSContext;

static int print_tls_error(URLContext *h, int ret)
{
switch (ret) {
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
break;
case GNUTLS_E_WARNING_ALERT_RECEIVED:
av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
break;
default:
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
break;
}
return AVERROR(EIO);
}

static int tls_close(URLContext *h)
{
TLSContext *c = h->priv_data;
if (c->need_shutdown)
gnutls_bye(c->session, GNUTLS_SHUT_RDWR);
if (c->session)
gnutls_deinit(c->session);
if (c->cred)
gnutls_certificate_free_credentials(c->cred);
if (c->tls_shared.tcp)
ffurl_close(c->tls_shared.tcp);
ff_tls_deinit();
return 0;
}

static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
void *buf, size_t len)
{
URLContext *h = (URLContext*) transport;
int ret = ffurl_read(h, buf, len);
if (ret >= 0)
return ret;
if (ret == AVERROR_EXIT)
return 0;
errno = EIO;
return -1;
}

static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
const void *buf, size_t len)
{
URLContext *h = (URLContext*) transport;
int ret = ffurl_write(h, buf, len);
if (ret >= 0)
return ret;
if (ret == AVERROR_EXIT)
return 0;
errno = EIO;
return -1;
}

static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
{
TLSContext *p = h->priv_data;
TLSShared *c = &p->tls_shared;
int ret;

if ((ret = ff_tls_init()) < 0)
return ret;

if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
goto fail;

gnutls_init(&p->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
if (!c->listen && !c->numerichost)
gnutls_server_name_set(p->session, GNUTLS_NAME_DNS, c->host, strlen(c->host));
gnutls_certificate_allocate_credentials(&p->cred);
if (c->ca_file) {
ret = gnutls_certificate_set_x509_trust_file(p->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
if (ret < 0)
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
}
#if GNUTLS_VERSION_MAJOR >= 3
else
gnutls_certificate_set_x509_system_trust(p->cred);
#endif
gnutls_certificate_set_verify_flags(p->cred, c->verify ?
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
if (c->cert_file && c->key_file) {
ret = gnutls_certificate_set_x509_key_file(p->cred,
c->cert_file, c->key_file,
GNUTLS_X509_FMT_PEM);
if (ret < 0) {
av_log(h, AV_LOG_ERROR,
"Unable to set cert/key files %s and %s: %s\n",
c->cert_file, c->key_file, gnutls_strerror(ret));
ret = AVERROR(EIO);
goto fail;
}
} else if (c->cert_file || c->key_file)
av_log(h, AV_LOG_ERROR, "cert and key required\n");
gnutls_credentials_set(p->session, GNUTLS_CRD_CERTIFICATE, p->cred);
gnutls_transport_set_pull_function(p->session, gnutls_url_pull);
gnutls_transport_set_push_function(p->session, gnutls_url_push);
gnutls_transport_set_ptr(p->session, c->tcp);
gnutls_priority_set_direct(p->session, "NORMAL", NULL);
ret = gnutls_handshake(p->session);
if (ret) {
ret = print_tls_error(h, ret);
goto fail;
}
p->need_shutdown = 1;
if (c->verify) {
unsigned int status, cert_list_size;
gnutls_x509_crt_t cert;
const gnutls_datum_t *cert_list;
if ((ret = gnutls_certificate_verify_peers2(p->session, &status)) < 0) {
av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
gnutls_strerror(ret));
ret = AVERROR(EIO);
goto fail;
}
if (status & GNUTLS_CERT_INVALID) {
av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
ret = AVERROR(EIO);
goto fail;
}
if (gnutls_certificate_type_get(p->session) != GNUTLS_CRT_X509) {
av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
ret = AVERROR(EIO);
goto fail;
}
gnutls_x509_crt_init(&cert);
cert_list = gnutls_certificate_get_peers(p->session, &cert_list_size);
gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
ret = gnutls_x509_crt_check_hostname(cert, c->host);
gnutls_x509_crt_deinit(cert);
if (!ret) {
av_log(h, AV_LOG_ERROR,
"The certificate's owner does not match hostname %s\n", c->host);
ret = AVERROR(EIO);
goto fail;
}
}

return 0;
fail:
tls_close(h);
return ret;
}

static int tls_read(URLContext *h, uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = gnutls_record_recv(c->session, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
}

static int tls_write(URLContext *h, const uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = gnutls_record_send(c->session, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
}

static const AVOption options[] = {
TLS_COMMON_OPTIONS(TLSContext, tls_shared),
{ NULL }
};

static const AVClass tls_class = {
.class_name = "tls",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};

URLProtocol ff_tls_gnutls_protocol = {
.name = "tls",
.url_open2 = tls_open,
.url_read = tls_read,
.url_write = tls_write,
.url_close = tls_close,
.priv_data_size = sizeof(TLSContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &tls_class,
};

+ 236
- 0
libavformat/tls_openssl.c View File

@@ -0,0 +1,236 @@
/*
* TLS/SSL Protocol
* Copyright (c) 2011 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#include "tls.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"

#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

typedef struct TLSContext {
const AVClass *class;
TLSShared tls_shared;
SSL_CTX *ctx;
SSL *ssl;
} TLSContext;

static int print_tls_error(URLContext *h, int ret)
{
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
return AVERROR(EIO);
}

static int tls_close(URLContext *h)
{
TLSContext *c = h->priv_data;
if (c->ssl) {
SSL_shutdown(c->ssl);
SSL_free(c->ssl);
}
if (c->ctx)
SSL_CTX_free(c->ctx);
if (c->tls_shared.tcp)
ffurl_close(c->tls_shared.tcp);
ff_tls_deinit();
return 0;
}

static int url_bio_create(BIO *b)
{
b->init = 1;
b->ptr = NULL;
b->flags = 0;
return 1;
}

static int url_bio_destroy(BIO *b)
{
return 1;
}

static int url_bio_bread(BIO *b, char *buf, int len)
{
URLContext *h = b->ptr;
int ret = ffurl_read(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR_EXIT)
return 0;
return -1;
}

static int url_bio_bwrite(BIO *b, const char *buf, int len)
{
URLContext *h = b->ptr;
int ret = ffurl_write(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR_EXIT)
return 0;
return -1;
}

static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
{
if (cmd == BIO_CTRL_FLUSH) {
BIO_clear_retry_flags(b);
return 1;
}
return 0;
}

static int url_bio_bputs(BIO *b, const char *str)
{
return url_bio_bwrite(b, str, strlen(str));
}

static BIO_METHOD url_bio_method = {
.type = BIO_TYPE_SOURCE_SINK,
.name = "urlprotocol bio",
.bwrite = url_bio_bwrite,
.bread = url_bio_bread,
.bputs = url_bio_bputs,
.bgets = NULL,
.ctrl = url_bio_ctrl,
.create = url_bio_create,
.destroy = url_bio_destroy,
};

static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
{
TLSContext *p = h->priv_data;
TLSShared *c = &p->tls_shared;
BIO *bio;
int ret;

if ((ret = ff_tls_init()) < 0)
return ret;

if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
goto fail;

p->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());
if (!p->ctx) {
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
if (c->ca_file) {
if (!SSL_CTX_load_verify_locations(p->ctx, c->ca_file, NULL))
av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
}
if (c->cert_file && !SSL_CTX_use_certificate_chain_file(p->ctx, c->cert_file)) {
av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
c->cert_file, ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
if (c->key_file && !SSL_CTX_use_PrivateKey_file(p->ctx, c->key_file, SSL_FILETYPE_PEM)) {
av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
c->key_file, ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
// Note, this doesn't check that the peer certificate actually matches
// the requested hostname.
if (c->verify)
SSL_CTX_set_verify(p->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
p->ssl = SSL_new(p->ctx);
if (!p->ssl) {
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
bio = BIO_new(&url_bio_method);
bio->ptr = c->tcp;
SSL_set_bio(p->ssl, bio, bio);
if (!c->listen && !c->numerichost)
SSL_set_tlsext_host_name(p->ssl, c->host);
ret = c->listen ? SSL_accept(p->ssl) : SSL_connect(p->ssl);
if (ret == 0) {
av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
ret = AVERROR(EIO);
goto fail;
} else if (ret < 0) {
ret = print_tls_error(h, ret);
goto fail;
}

return 0;
fail:
tls_close(h);
return ret;
}

static int tls_read(URLContext *h, uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = SSL_read(c->ssl, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
}

static int tls_write(URLContext *h, const uint8_t *buf, int size)
{
TLSContext *c = h->priv_data;
int ret = SSL_write(c->ssl, buf, size);
if (ret > 0)
return ret;
if (ret == 0)
return AVERROR_EOF;
return print_tls_error(h, ret);
}

static const AVOption options[] = {
TLS_COMMON_OPTIONS(TLSContext, tls_shared),
{ NULL }
};

static const AVClass tls_class = {
.class_name = "tls",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};

URLProtocol ff_tls_openssl_protocol = {
.name = "tls",
.url_open2 = tls_open,
.url_read = tls_read,
.url_write = tls_write,
.url_close = tls_close,
.priv_data_size = sizeof(TLSContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &tls_class,
};

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