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ffmpeg/libavformat/tls_openssl.c

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/*
* 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 "libavcodec/internal.h"
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/thread.h"
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
static int openssl_init;
typedef struct TLSContext {
const AVClass *class;
TLSShared tls_shared;
SSL_CTX *ctx;
SSL *ssl;
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
BIO_METHOD* url_bio_method;
#endif
} TLSContext;
#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
#include <openssl/crypto.h>
pthread_mutex_t *openssl_mutexes;
static void openssl_lock(int mode, int type, const char *file, int line)
{
if (mode & CRYPTO_LOCK)
pthread_mutex_lock(&openssl_mutexes[type]);
else
pthread_mutex_unlock(&openssl_mutexes[type]);
}
#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
static unsigned long openssl_thread_id(void)
{
return (intptr_t) pthread_self();
}
#endif
#endif
int ff_openssl_init(void)
{
ff_lock_avformat();
if (!openssl_init) {
/* OpenSSL 1.0.2 or below, then you would use SSL_library_init. If you are
* using OpenSSL 1.1.0 or above, then the library will initialize
* itself automatically.
* https://wiki.openssl.org/index.php/Library_Initialization
*/
#if OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_library_init();
SSL_load_error_strings();
#endif
#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
if (!CRYPTO_get_locking_callback()) {
int i;
openssl_mutexes = av_malloc_array(sizeof(pthread_mutex_t), CRYPTO_num_locks());
if (!openssl_mutexes) {
ff_unlock_avformat();
return AVERROR(ENOMEM);
}
for (i = 0; i < CRYPTO_num_locks(); i++)
pthread_mutex_init(&openssl_mutexes[i], NULL);
CRYPTO_set_locking_callback(openssl_lock);
#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
CRYPTO_set_id_callback(openssl_thread_id);
#endif
}
#endif
}
openssl_init++;
ff_unlock_avformat();
return 0;
}
void ff_openssl_deinit(void)
{
ff_lock_avformat();
openssl_init--;
if (!openssl_init) {
#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
if (CRYPTO_get_locking_callback() == openssl_lock) {
int i;
CRYPTO_set_locking_callback(NULL);
for (i = 0; i < CRYPTO_num_locks(); i++)
pthread_mutex_destroy(&openssl_mutexes[i]);
av_free(openssl_mutexes);
}
#endif
}
ff_unlock_avformat();
}
static int print_tls_error(URLContext *h, int ret)
{
TLSContext *c = h->priv_data;
if (h->flags & AVIO_FLAG_NONBLOCK) {
int err = SSL_get_error(c->ssl, ret);
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
return AVERROR(EAGAIN);
}
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);
ffurl_closep(&c->tls_shared.tcp);
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
if (c->url_bio_method)
BIO_meth_free(c->url_bio_method);
#endif
ff_openssl_deinit();
return 0;
}
static int url_bio_create(BIO *b)
{
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
BIO_set_init(b, 1);
BIO_set_data(b, NULL);
BIO_set_flags(b, 0);
#else
b->init = 1;
b->ptr = NULL;
b->flags = 0;
#endif
return 1;
}
static int url_bio_destroy(BIO *b)
{
return 1;
}
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
#define GET_BIO_DATA(x) BIO_get_data(x)
#else
#define GET_BIO_DATA(x) (x)->ptr
#endif
static int url_bio_bread(BIO *b, char *buf, int len)
{
URLContext *h = GET_BIO_DATA(b);
int ret = ffurl_read(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR(EAGAIN))
BIO_set_retry_read(b);
if (ret == AVERROR_EXIT)
return 0;
return -1;
}
static int url_bio_bwrite(BIO *b, const char *buf, int len)
{
URLContext *h = GET_BIO_DATA(b);
int ret = ffurl_write(h, buf, len);
if (ret >= 0)
return ret;
BIO_clear_retry_flags(b);
if (ret == AVERROR(EAGAIN))
BIO_set_retry_write(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));
}
#if OPENSSL_VERSION_NUMBER < 0x1010000fL
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
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_openssl_init()) < 0)
return ret;
if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
goto fail;
// We want to support all versions of TLS >= 1.0, but not the deprecated
// and insecure SSLv2 and SSLv3. Despite the name, SSLv23_*_method()
// enables support for all versions of SSL and TLS, and we then disable
// support for the old protocols immediately after creating the context.
p->ctx = SSL_CTX_new(c->listen ? SSLv23_server_method() : SSLv23_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;
}
SSL_CTX_set_options(p->ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
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;
}
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
p->url_bio_method = BIO_meth_new(BIO_TYPE_SOURCE_SINK, "urlprotocol bio");
BIO_meth_set_write(p->url_bio_method, url_bio_bwrite);
BIO_meth_set_read(p->url_bio_method, url_bio_bread);
BIO_meth_set_puts(p->url_bio_method, url_bio_bputs);
BIO_meth_set_ctrl(p->url_bio_method, url_bio_ctrl);
BIO_meth_set_create(p->url_bio_method, url_bio_create);
BIO_meth_set_destroy(p->url_bio_method, url_bio_destroy);
bio = BIO_new(p->url_bio_method);
BIO_set_data(bio, c->tcp);
#else
bio = BIO_new(&url_bio_method);
bio->ptr = c->tcp;
#endif
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;
// Set or clear the AVIO_FLAG_NONBLOCK on c->tls_shared.tcp
c->tls_shared.tcp->flags &= ~AVIO_FLAG_NONBLOCK;
c->tls_shared.tcp->flags |= h->flags & AVIO_FLAG_NONBLOCK;
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;
// Set or clear the AVIO_FLAG_NONBLOCK on c->tls_shared.tcp
c->tls_shared.tcp->flags &= ~AVIO_FLAG_NONBLOCK;
c->tls_shared.tcp->flags |= h->flags & AVIO_FLAG_NONBLOCK;
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 int tls_get_file_handle(URLContext *h)
{
TLSContext *c = h->priv_data;
return ffurl_get_file_handle(c->tls_shared.tcp);
}
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,
};
const URLProtocol ff_tls_protocol = {
.name = "tls",
.url_open2 = tls_open,
.url_read = tls_read,
.url_write = tls_write,
.url_close = tls_close,
.url_get_file_handle = tls_get_file_handle,
.priv_data_size = sizeof(TLSContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.priv_data_class = &tls_class,
};