377 lines
11 KiB
C
377 lines
11 KiB
C
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/*
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* TLS/SSL Protocol
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* Copyright (c) 2011 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "network.h"
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#include "os_support.h"
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#include "url.h"
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#include "tls.h"
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#include "libavcodec/internal.h"
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#include "libavutil/avstring.h"
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#include "libavutil/avutil.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/thread.h"
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#include <openssl/bio.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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static int openssl_init;
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typedef struct TLSContext {
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const AVClass *class;
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TLSShared tls_shared;
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SSL_CTX *ctx;
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SSL *ssl;
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#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
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BIO_METHOD* url_bio_method;
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#endif
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} TLSContext;
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#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
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#include <openssl/crypto.h>
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pthread_mutex_t *openssl_mutexes;
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static void openssl_lock(int mode, int type, const char *file, int line)
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{
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if (mode & CRYPTO_LOCK)
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pthread_mutex_lock(&openssl_mutexes[type]);
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else
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pthread_mutex_unlock(&openssl_mutexes[type]);
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}
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#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
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static unsigned long openssl_thread_id(void)
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{
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return (intptr_t) pthread_self();
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}
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#endif
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#endif
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int ff_openssl_init(void)
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{
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ff_lock_avformat();
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if (!openssl_init) {
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/* OpenSSL 1.0.2 or below, then you would use SSL_library_init. If you are
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* using OpenSSL 1.1.0 or above, then the library will initialize
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* itself automatically.
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* https://wiki.openssl.org/index.php/Library_Initialization
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*/
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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SSL_library_init();
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SSL_load_error_strings();
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#endif
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#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
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if (!CRYPTO_get_locking_callback()) {
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int i;
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openssl_mutexes = av_malloc_array(sizeof(pthread_mutex_t), CRYPTO_num_locks());
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if (!openssl_mutexes) {
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ff_unlock_avformat();
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return AVERROR(ENOMEM);
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}
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for (i = 0; i < CRYPTO_num_locks(); i++)
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pthread_mutex_init(&openssl_mutexes[i], NULL);
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CRYPTO_set_locking_callback(openssl_lock);
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#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
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CRYPTO_set_id_callback(openssl_thread_id);
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#endif
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}
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#endif
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}
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openssl_init++;
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ff_unlock_avformat();
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return 0;
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}
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void ff_openssl_deinit(void)
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{
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ff_lock_avformat();
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openssl_init--;
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if (!openssl_init) {
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#if HAVE_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
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if (CRYPTO_get_locking_callback() == openssl_lock) {
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int i;
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CRYPTO_set_locking_callback(NULL);
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for (i = 0; i < CRYPTO_num_locks(); i++)
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pthread_mutex_destroy(&openssl_mutexes[i]);
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av_free(openssl_mutexes);
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}
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#endif
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}
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ff_unlock_avformat();
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}
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static int print_tls_error(URLContext *h, int ret)
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{
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TLSContext *c = h->priv_data;
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if (h->flags & AVIO_FLAG_NONBLOCK) {
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int err = SSL_get_error(c->ssl, ret);
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if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
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return AVERROR(EAGAIN);
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}
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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return AVERROR(EIO);
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}
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static int tls_close(URLContext *h)
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{
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TLSContext *c = h->priv_data;
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if (c->ssl) {
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SSL_shutdown(c->ssl);
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SSL_free(c->ssl);
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}
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if (c->ctx)
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SSL_CTX_free(c->ctx);
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ffurl_closep(&c->tls_shared.tcp);
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#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
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if (c->url_bio_method)
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BIO_meth_free(c->url_bio_method);
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#endif
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ff_openssl_deinit();
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return 0;
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}
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static int url_bio_create(BIO *b)
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{
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#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
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BIO_set_init(b, 1);
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BIO_set_data(b, NULL);
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BIO_set_flags(b, 0);
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#else
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b->init = 1;
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b->ptr = NULL;
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b->flags = 0;
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#endif
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return 1;
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}
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static int url_bio_destroy(BIO *b)
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{
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return 1;
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}
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#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
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#define GET_BIO_DATA(x) BIO_get_data(x)
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#else
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#define GET_BIO_DATA(x) (x)->ptr
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#endif
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static int url_bio_bread(BIO *b, char *buf, int len)
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{
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URLContext *h = GET_BIO_DATA(b);
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int ret = ffurl_read(h, buf, len);
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if (ret >= 0)
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return ret;
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BIO_clear_retry_flags(b);
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if (ret == AVERROR(EAGAIN))
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BIO_set_retry_read(b);
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if (ret == AVERROR_EXIT)
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return 0;
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return -1;
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}
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static int url_bio_bwrite(BIO *b, const char *buf, int len)
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{
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URLContext *h = GET_BIO_DATA(b);
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int ret = ffurl_write(h, buf, len);
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if (ret >= 0)
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return ret;
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BIO_clear_retry_flags(b);
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if (ret == AVERROR(EAGAIN))
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BIO_set_retry_write(b);
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if (ret == AVERROR_EXIT)
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return 0;
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return -1;
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}
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static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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if (cmd == BIO_CTRL_FLUSH) {
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BIO_clear_retry_flags(b);
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return 1;
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}
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return 0;
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}
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static int url_bio_bputs(BIO *b, const char *str)
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{
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return url_bio_bwrite(b, str, strlen(str));
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}
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#if OPENSSL_VERSION_NUMBER < 0x1010000fL
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static BIO_METHOD url_bio_method = {
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.type = BIO_TYPE_SOURCE_SINK,
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.name = "urlprotocol bio",
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.bwrite = url_bio_bwrite,
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.bread = url_bio_bread,
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.bputs = url_bio_bputs,
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.bgets = NULL,
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.ctrl = url_bio_ctrl,
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.create = url_bio_create,
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.destroy = url_bio_destroy,
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};
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#endif
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static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
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{
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TLSContext *p = h->priv_data;
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TLSShared *c = &p->tls_shared;
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BIO *bio;
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int ret;
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if ((ret = ff_openssl_init()) < 0)
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return ret;
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if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
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goto fail;
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// We want to support all versions of TLS >= 1.0, but not the deprecated
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// and insecure SSLv2 and SSLv3. Despite the name, SSLv23_*_method()
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// enables support for all versions of SSL and TLS, and we then disable
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// support for the old protocols immediately after creating the context.
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p->ctx = SSL_CTX_new(c->listen ? SSLv23_server_method() : SSLv23_client_method());
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if (!p->ctx) {
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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SSL_CTX_set_options(p->ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
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if (c->ca_file) {
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if (!SSL_CTX_load_verify_locations(p->ctx, c->ca_file, NULL))
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av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
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}
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if (c->cert_file && !SSL_CTX_use_certificate_chain_file(p->ctx, c->cert_file)) {
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av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
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c->cert_file, ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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if (c->key_file && !SSL_CTX_use_PrivateKey_file(p->ctx, c->key_file, SSL_FILETYPE_PEM)) {
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av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
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c->key_file, ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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// Note, this doesn't check that the peer certificate actually matches
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// the requested hostname.
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if (c->verify)
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SSL_CTX_set_verify(p->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
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p->ssl = SSL_new(p->ctx);
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if (!p->ssl) {
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
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p->url_bio_method = BIO_meth_new(BIO_TYPE_SOURCE_SINK, "urlprotocol bio");
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BIO_meth_set_write(p->url_bio_method, url_bio_bwrite);
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BIO_meth_set_read(p->url_bio_method, url_bio_bread);
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BIO_meth_set_puts(p->url_bio_method, url_bio_bputs);
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BIO_meth_set_ctrl(p->url_bio_method, url_bio_ctrl);
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BIO_meth_set_create(p->url_bio_method, url_bio_create);
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BIO_meth_set_destroy(p->url_bio_method, url_bio_destroy);
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bio = BIO_new(p->url_bio_method);
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BIO_set_data(bio, c->tcp);
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#else
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bio = BIO_new(&url_bio_method);
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bio->ptr = c->tcp;
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#endif
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SSL_set_bio(p->ssl, bio, bio);
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if (!c->listen && !c->numerichost)
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SSL_set_tlsext_host_name(p->ssl, c->host);
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ret = c->listen ? SSL_accept(p->ssl) : SSL_connect(p->ssl);
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if (ret == 0) {
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av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
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ret = AVERROR(EIO);
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goto fail;
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} else if (ret < 0) {
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ret = print_tls_error(h, ret);
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goto fail;
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}
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return 0;
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fail:
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tls_close(h);
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return ret;
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}
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static int tls_read(URLContext *h, uint8_t *buf, int size)
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{
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TLSContext *c = h->priv_data;
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int ret;
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// Set or clear the AVIO_FLAG_NONBLOCK on c->tls_shared.tcp
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c->tls_shared.tcp->flags &= ~AVIO_FLAG_NONBLOCK;
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c->tls_shared.tcp->flags |= h->flags & AVIO_FLAG_NONBLOCK;
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ret = SSL_read(c->ssl, buf, size);
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if (ret > 0)
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return ret;
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if (ret == 0)
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return AVERROR_EOF;
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return print_tls_error(h, ret);
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}
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static int tls_write(URLContext *h, const uint8_t *buf, int size)
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{
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TLSContext *c = h->priv_data;
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int ret;
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// Set or clear the AVIO_FLAG_NONBLOCK on c->tls_shared.tcp
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c->tls_shared.tcp->flags &= ~AVIO_FLAG_NONBLOCK;
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c->tls_shared.tcp->flags |= h->flags & AVIO_FLAG_NONBLOCK;
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ret = SSL_write(c->ssl, buf, size);
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if (ret > 0)
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return ret;
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if (ret == 0)
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return AVERROR_EOF;
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return print_tls_error(h, ret);
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}
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static int tls_get_file_handle(URLContext *h)
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{
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TLSContext *c = h->priv_data;
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return ffurl_get_file_handle(c->tls_shared.tcp);
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}
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static const AVOption options[] = {
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TLS_COMMON_OPTIONS(TLSContext, tls_shared),
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{ NULL }
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||
|
|
};
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|