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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: Martin Storsjö <martin@martin.st>
234 lines
6.0 KiB
C
234 lines
6.0 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.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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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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} TLSContext;
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static int print_tls_error(URLContext *h, int ret)
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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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if (c->tls_shared.tcp)
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ffurl_close(c->tls_shared.tcp);
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ff_tls_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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b->init = 1;
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b->ptr = NULL;
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b->flags = 0;
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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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static int url_bio_bread(BIO *b, char *buf, int len)
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{
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URLContext *h = b->ptr;
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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_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 = b->ptr;
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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_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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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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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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ff_tls_init();
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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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p->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_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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if (c->ca_file)
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SSL_CTX_load_verify_locations(p->ctx, c->ca_file, NULL);
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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, 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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bio = BIO_new(&url_bio_method);
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bio->ptr = c->tcp;
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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 = 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 = 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 const AVOption options[] = {
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TLS_COMMON_OPTIONS(TLSContext, tls_shared),
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{ NULL }
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};
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static const AVClass tls_class = {
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.class_name = "tls",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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URLProtocol ff_tls_openssl_protocol = {
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.name = "tls",
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.url_open2 = tls_open,
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.url_read = tls_read,
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.url_write = tls_write,
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.url_close = tls_close,
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.priv_data_size = sizeof(TLSContext),
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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.priv_data_class = &tls_class,
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};
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