mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
36083450a4
fix resource leak in mbedtls part. fix #8614 Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
353 lines
12 KiB
C
353 lines
12 KiB
C
/*
|
|
* TLS/SSL Protocol
|
|
* Copyright (c) 2018 Thomas Volkert
|
|
*
|
|
* 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 <mbedtls/certs.h>
|
|
#include <mbedtls/config.h>
|
|
#include <mbedtls/ctr_drbg.h>
|
|
#include <mbedtls/entropy.h>
|
|
#include <mbedtls/net_sockets.h>
|
|
#include <mbedtls/platform.h>
|
|
#include <mbedtls/ssl.h>
|
|
#include <mbedtls/x509_crt.h>
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "url.h"
|
|
#include "tls.h"
|
|
#include "libavutil/parseutils.h"
|
|
|
|
typedef struct TLSContext {
|
|
const AVClass *class;
|
|
TLSShared tls_shared;
|
|
mbedtls_ssl_context ssl_context;
|
|
mbedtls_ssl_config ssl_config;
|
|
mbedtls_entropy_context entropy_context;
|
|
mbedtls_ctr_drbg_context ctr_drbg_context;
|
|
mbedtls_x509_crt ca_cert;
|
|
mbedtls_x509_crt own_cert;
|
|
mbedtls_pk_context priv_key;
|
|
char *priv_key_pw;
|
|
} TLSContext;
|
|
|
|
#define OFFSET(x) offsetof(TLSContext, x)
|
|
|
|
static int tls_close(URLContext *h)
|
|
{
|
|
TLSContext *tls_ctx = h->priv_data;
|
|
|
|
mbedtls_ssl_close_notify(&tls_ctx->ssl_context);
|
|
mbedtls_pk_free(&tls_ctx->priv_key);
|
|
mbedtls_x509_crt_free(&tls_ctx->ca_cert);
|
|
mbedtls_x509_crt_free(&tls_ctx->own_cert);
|
|
mbedtls_ssl_free(&tls_ctx->ssl_context);
|
|
mbedtls_ssl_config_free(&tls_ctx->ssl_config);
|
|
mbedtls_ctr_drbg_free(&tls_ctx->ctr_drbg_context);
|
|
mbedtls_entropy_free(&tls_ctx->entropy_context);
|
|
|
|
ffurl_closep(&tls_ctx->tls_shared.tcp);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_transport_error(URLContext *h, const char* func_name, int react_on_eagain, int ret)
|
|
{
|
|
switch (ret) {
|
|
case AVERROR(EAGAIN):
|
|
return react_on_eagain;
|
|
case AVERROR_EXIT:
|
|
return 0;
|
|
case AVERROR(EPIPE):
|
|
case AVERROR(ECONNRESET):
|
|
return MBEDTLS_ERR_NET_CONN_RESET;
|
|
default:
|
|
av_log(h, AV_LOG_ERROR, "%s returned 0x%x\n", func_name, ret);
|
|
errno = EIO;
|
|
return MBEDTLS_ERR_NET_SEND_FAILED;
|
|
}
|
|
}
|
|
|
|
static int mbedtls_send(void *ctx, const unsigned char *buf, size_t len)
|
|
{
|
|
URLContext *h = (URLContext*) ctx;
|
|
int ret = ffurl_write(h, buf, len);
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
if (h->max_packet_size && len > h->max_packet_size)
|
|
return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
|
|
|
|
return handle_transport_error(h, "ffurl_write", MBEDTLS_ERR_SSL_WANT_WRITE, ret);
|
|
}
|
|
|
|
static int mbedtls_recv(void *ctx, unsigned char *buf, size_t len)
|
|
{
|
|
URLContext *h = (URLContext*) ctx;
|
|
int ret = ffurl_read(h, buf, len);
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
if (h->max_packet_size && len > h->max_packet_size)
|
|
return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
|
|
|
|
return handle_transport_error(h, "ffurl_read", MBEDTLS_ERR_SSL_WANT_READ, ret);
|
|
}
|
|
|
|
static void handle_pk_parse_error(URLContext *h, int ret)
|
|
{
|
|
switch (ret) {
|
|
case MBEDTLS_ERR_PK_FILE_IO_ERROR:
|
|
av_log(h, AV_LOG_ERROR, "Read of key file failed. Is it actually there, are the access permissions correct?\n");
|
|
break;
|
|
case MBEDTLS_ERR_PK_PASSWORD_REQUIRED:
|
|
av_log(h, AV_LOG_ERROR, "A password for the private key is missing.\n");
|
|
break;
|
|
case MBEDTLS_ERR_PK_PASSWORD_MISMATCH:
|
|
av_log(h, AV_LOG_ERROR, "The given password for the private key is wrong.\n");
|
|
break;
|
|
default:
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_pk_parse_key returned -0x%x\n", -ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void handle_handshake_error(URLContext *h, int ret)
|
|
{
|
|
switch (ret) {
|
|
case MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE:
|
|
av_log(h, AV_LOG_ERROR, "None of the common ciphersuites is usable. Was the local certificate correctly set?\n");
|
|
break;
|
|
case MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE:
|
|
av_log(h, AV_LOG_ERROR, "A fatal alert message was received from the peer, has the peer a correct certificate?\n");
|
|
break;
|
|
case MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED:
|
|
av_log(h, AV_LOG_ERROR, "No CA chain is set, but required to operate. Was the CA correctly set?\n");
|
|
break;
|
|
case MBEDTLS_ERR_NET_CONN_RESET:
|
|
av_log(h, AV_LOG_ERROR, "TLS handshake was aborted by peer.\n");
|
|
break;
|
|
default:
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_handshake returned -0x%x\n", -ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void parse_options(TLSContext *tls_ctxc, const char *uri)
|
|
{
|
|
char buf[1024];
|
|
const char *p = strchr(uri, '?');
|
|
if (!p)
|
|
return;
|
|
|
|
if (!tls_ctxc->priv_key_pw && av_find_info_tag(buf, sizeof(buf), "key_password", p))
|
|
tls_ctxc->priv_key_pw = av_strdup(buf);
|
|
}
|
|
|
|
static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
|
|
{
|
|
TLSContext *tls_ctx = h->priv_data;
|
|
TLSShared *shr = &tls_ctx->tls_shared;
|
|
uint32_t verify_res_flags;
|
|
int ret;
|
|
|
|
// parse additional options
|
|
parse_options(tls_ctx, uri);
|
|
|
|
if ((ret = ff_tls_open_underlying(shr, h, uri, options)) < 0)
|
|
goto fail;
|
|
|
|
mbedtls_ssl_init(&tls_ctx->ssl_context);
|
|
mbedtls_ssl_config_init(&tls_ctx->ssl_config);
|
|
mbedtls_entropy_init(&tls_ctx->entropy_context);
|
|
mbedtls_ctr_drbg_init(&tls_ctx->ctr_drbg_context);
|
|
mbedtls_x509_crt_init(&tls_ctx->ca_cert);
|
|
mbedtls_pk_init(&tls_ctx->priv_key);
|
|
|
|
// load trusted CA
|
|
if (shr->ca_file) {
|
|
if ((ret = mbedtls_x509_crt_parse_file(&tls_ctx->ca_cert, shr->ca_file)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_x509_crt_parse_file for CA cert returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// load own certificate
|
|
if (shr->cert_file) {
|
|
if ((ret = mbedtls_x509_crt_parse_file(&tls_ctx->own_cert, shr->cert_file)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_x509_crt_parse_file for own cert returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// load key file
|
|
if (shr->key_file) {
|
|
if ((ret = mbedtls_pk_parse_keyfile(&tls_ctx->priv_key,
|
|
shr->key_file,
|
|
tls_ctx->priv_key_pw)) != 0) {
|
|
handle_pk_parse_error(h, ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// seed the random number generator
|
|
if ((ret = mbedtls_ctr_drbg_seed(&tls_ctx->ctr_drbg_context,
|
|
mbedtls_entropy_func,
|
|
&tls_ctx->entropy_context,
|
|
NULL, 0)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ctr_drbg_seed returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if ((ret = mbedtls_ssl_config_defaults(&tls_ctx->ssl_config,
|
|
shr->listen ? MBEDTLS_SSL_IS_SERVER : MBEDTLS_SSL_IS_CLIENT,
|
|
MBEDTLS_SSL_TRANSPORT_STREAM,
|
|
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_config_defaults returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
mbedtls_ssl_conf_authmode(&tls_ctx->ssl_config,
|
|
shr->ca_file ? MBEDTLS_SSL_VERIFY_REQUIRED : MBEDTLS_SSL_VERIFY_NONE);
|
|
mbedtls_ssl_conf_rng(&tls_ctx->ssl_config, mbedtls_ctr_drbg_random, &tls_ctx->ctr_drbg_context);
|
|
mbedtls_ssl_conf_ca_chain(&tls_ctx->ssl_config, &tls_ctx->ca_cert, NULL);
|
|
|
|
// set own certificate and private key
|
|
if ((ret = mbedtls_ssl_conf_own_cert(&tls_ctx->ssl_config, &tls_ctx->own_cert, &tls_ctx->priv_key)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_conf_own_cert returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if ((ret = mbedtls_ssl_setup(&tls_ctx->ssl_context, &tls_ctx->ssl_config)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_setup returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (!shr->listen && !shr->numerichost) {
|
|
if ((ret = mbedtls_ssl_set_hostname(&tls_ctx->ssl_context, shr->host)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_set_hostname returned %d\n", ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// set I/O functions to use FFmpeg internal code for transport layer
|
|
mbedtls_ssl_set_bio(&tls_ctx->ssl_context, shr->tcp, mbedtls_send, mbedtls_recv, NULL);
|
|
|
|
// ssl handshake
|
|
while ((ret = mbedtls_ssl_handshake(&tls_ctx->ssl_context)) != 0) {
|
|
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
handle_handshake_error(h, ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (shr->verify) {
|
|
// check the result of the certificate verification
|
|
if ((verify_res_flags = mbedtls_ssl_get_verify_result(&tls_ctx->ssl_context)) != 0) {
|
|
av_log(h, AV_LOG_ERROR, "mbedtls_ssl_get_verify_result reported problems "\
|
|
"with the certificate verification, returned flags: %u\n",
|
|
verify_res_flags);
|
|
if (verify_res_flags & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
|
|
av_log(h, AV_LOG_ERROR, "The certificate is not correctly signed by the trusted CA.\n");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
tls_close(h);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
static int handle_tls_error(URLContext *h, const char* func_name, int ret)
|
|
{
|
|
switch (ret) {
|
|
case MBEDTLS_ERR_SSL_WANT_READ:
|
|
case MBEDTLS_ERR_SSL_WANT_WRITE:
|
|
return AVERROR(EAGAIN);
|
|
case MBEDTLS_ERR_NET_SEND_FAILED:
|
|
case MBEDTLS_ERR_NET_RECV_FAILED:
|
|
return AVERROR(EIO);
|
|
case MBEDTLS_ERR_NET_CONN_RESET:
|
|
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
|
|
av_log(h, AV_LOG_WARNING, "%s reported connection reset by peer\n", func_name);
|
|
return AVERROR_EOF;
|
|
default:
|
|
av_log(h, AV_LOG_ERROR, "%s returned -0x%x\n", func_name, -ret);
|
|
return AVERROR(EIO);
|
|
}
|
|
}
|
|
|
|
static int tls_read(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
TLSContext *tls_ctx = h->priv_data;
|
|
int ret;
|
|
|
|
if ((ret = mbedtls_ssl_read(&tls_ctx->ssl_context, buf, size)) > 0) {
|
|
// return read length
|
|
return ret;
|
|
}
|
|
|
|
return handle_tls_error(h, "mbedtls_ssl_read", ret);
|
|
}
|
|
|
|
static int tls_write(URLContext *h, const uint8_t *buf, int size)
|
|
{
|
|
TLSContext *tls_ctx = h->priv_data;
|
|
int ret;
|
|
|
|
if ((ret = mbedtls_ssl_write(&tls_ctx->ssl_context, buf, size)) > 0) {
|
|
// return written length
|
|
return ret;
|
|
}
|
|
|
|
return handle_tls_error(h, "mbedtls_ssl_write", 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), \
|
|
{"key_password", "Password for the private key file", OFFSET(priv_key_pw), AV_OPT_TYPE_STRING, .flags = TLS_OPTFL }, \
|
|
{ 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,
|
|
};
|