| /* |
| * 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 int tls_get_short_seek(URLContext *h) |
| { |
| TLSContext *s = h->priv_data; |
| return ffurl_get_short_seek(s->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, |
| .url_get_short_seek = tls_get_short_seek, |
| .priv_data_size = sizeof(TLSContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| .priv_data_class = &tls_class, |
| }; |