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/*
* TLS/SSL Protocol
* Copyright (c) 2011 Martin Storsjo
* Copyright (c) 2017 sfan5 <sfan5@live.de>
*
* 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 "url.h"
#include "tls.h"
#include "libavcodec/internal.h"
#include "libavutil/avutil.h"
#include "libavutil/opt.h"
#include <tls.h>
typedef struct TLSContext {
const AVClass *class;
TLSShared tls_shared;
struct tls *ctx;
} TLSContext;
static int ff_tls_close(URLContext *h)
{
TLSContext *p = h->priv_data;
if (p->ctx) {
tls_close(p->ctx);
tls_free(p->ctx);
}
ffurl_closep(&p->tls_shared.tcp);
return 0;
}
static ssize_t tls_read_callback(struct tls *ctx, void *buf, size_t buflen, void *cb_arg)
{
URLContext *h = (URLContext*) cb_arg;
int ret = ffurl_read(h, buf, buflen);
if (ret == AVERROR(EAGAIN))
return TLS_WANT_POLLIN;
else if (ret == AVERROR_EXIT)
return 0;
return ret >= 0 ? ret : -1;
}
static ssize_t tls_write_callback(struct tls *ctx, const void *buf, size_t buflen, void *cb_arg)
{
URLContext *h = (URLContext*) cb_arg;
int ret = ffurl_write(h, buf, buflen);
if (ret == AVERROR(EAGAIN))
return TLS_WANT_POLLOUT;
else if (ret == AVERROR_EXIT)
return 0;
return ret >= 0 ? ret : -1;
}
static int ff_tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
{
TLSContext *p = h->priv_data;
TLSShared *c = &p->tls_shared;
struct tls_config *cfg = NULL;
int ret;
if (tls_init() == -1) {
ret = AVERROR(EIO);
goto fail;
}
if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
goto fail;
p->ctx = !c->listen ? tls_client() : tls_server();
if (!p->ctx) {
ret = AVERROR(EIO);
goto fail;
}
cfg = tls_config_new();
if (!p->ctx) {
ret = AVERROR(EIO);
goto fail;
}
if (tls_config_set_protocols(cfg, TLS_PROTOCOLS_ALL) == -1)
goto err_config;
// While TLSv1.0 and TLSv1.1 are already enabled by the above,
// we need to be less strict with ciphers so it works in practice.
if (tls_config_set_ciphers(cfg, "compat") == -1)
goto err_config;
if (c->ca_file && tls_config_set_ca_file(cfg, c->ca_file) == -1)
goto err_config;
if (c->cert_file && tls_config_set_cert_file(cfg, c->cert_file) == -1)
goto err_config;
if (c->key_file && tls_config_set_key_file(cfg, c->key_file) == -1)
goto err_config;
if (!c->verify) {
tls_config_insecure_noverifycert(cfg);
tls_config_insecure_noverifyname(cfg);
tls_config_insecure_noverifytime(cfg);
}
if (tls_configure(p->ctx, cfg) == -1)
goto err_ctx;
if (!c->listen) {
ret = tls_connect_cbs(p->ctx, tls_read_callback, tls_write_callback,
c->tcp, c->host);
} else {
struct tls *ctx_new;
ret = tls_accept_cbs(p->ctx, &ctx_new, tls_read_callback,
tls_write_callback, c->tcp);
if (ret == 0) {
// free "server" context and replace by "connection" context
tls_free(p->ctx);
p->ctx = ctx_new;
}
}
if (ret == -1)
goto err_ctx;
tls_config_free(cfg);
return 0;
err_config:
av_log(h, AV_LOG_ERROR, "%s\n", tls_config_error(cfg));
ret = AVERROR(EIO);
goto fail;
err_ctx:
av_log(h, AV_LOG_ERROR, "%s\n", tls_error(p->ctx));
ret = AVERROR(EIO);
/* fallthrough */
fail:
if (cfg)
tls_config_free(cfg);
ff_tls_close(h);
return ret;
}
static int ff_tls_read(URLContext *h, uint8_t *buf, int size)
{
TLSContext *p = h->priv_data;
ssize_t ret;
ret = tls_read(p->ctx, buf, size);
if (ret > 0)
return ret;
else if (ret == 0)
return AVERROR_EOF;
else if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT)
return AVERROR(EAGAIN);
av_log(h, AV_LOG_ERROR, "%s\n", tls_error(p->ctx));
return AVERROR(EIO);
}
static int ff_tls_write(URLContext *h, const uint8_t *buf, int size)
{
TLSContext *p = h->priv_data;
ssize_t ret;
ret = tls_write(p->ctx, buf, size);
if (ret > 0)
return ret;
else if (ret == 0)
return AVERROR_EOF;
else if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT)
return AVERROR(EAGAIN);
av_log(h, AV_LOG_ERROR, "%s\n", tls_error(p->ctx));
return AVERROR(EIO);
}
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",
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const URLProtocol ff_tls_protocol = {
.name = "tls",
.url_open2 = ff_tls_open,
.url_read = ff_tls_read,
.url_write = ff_tls_write,
.url_close = ff_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,
};
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