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RetroArch/libretro-common/net/net_socket_ssl_mbed.c

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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (net_socket.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <net/net_compat.h>
#include <net/net_socket.h>
#include <net/net_socket_ssl.h>
#if defined(HAVE_BUILTINMBEDTLS)
#include "../../deps/mbedtls/mbedtls/config.h"
#include "../../deps/mbedtls/mbedtls/certs.h"
#include "../../deps/mbedtls/mbedtls/debug.h"
#include "../../deps/mbedtls/mbedtls/platform.h"
#include "../../deps/mbedtls/mbedtls/net_sockets.h"
#include "../../deps/mbedtls/mbedtls/ssl.h"
#include "../../deps/mbedtls/mbedtls/ctr_drbg.h"
#include "../../deps/mbedtls/mbedtls/entropy.h"
#else
#include <mbedtls/config.h>
#include <mbedtls/certs.h>
#include <mbedtls/debug.h>
#include <mbedtls/platform.h>
#include <mbedtls/net_sockets.h>
#include <mbedtls/ssl.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/entropy.h>
#endif
/* Not part of the mbedtls upstream source */
#include "../../deps/mbedtls/cacert.h"
#define DEBUG_LEVEL 0
struct ssl_state
{
mbedtls_net_context net_ctx;
mbedtls_ssl_context ctx;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_config conf;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt ca;
#endif
const char *domain;
};
static void ssl_debug(void *ctx, int level,
const char *file, int line,
const char *str)
{
fprintf((FILE*)ctx, "%s:%04d: %s", file, line, str);
fflush((FILE*)ctx);
}
void* ssl_socket_init(int fd, const char *domain)
{
static const char *pers = "libretro";
struct ssl_state *state = (struct ssl_state*)calloc(1, sizeof(*state));
state->domain = domain;
#if defined(MBEDTLS_DEBUG_C)
mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif
mbedtls_net_init(&state->net_ctx);
mbedtls_ssl_init(&state->ctx);
mbedtls_ssl_config_init(&state->conf);
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt_init(&state->ca);
#endif
mbedtls_ctr_drbg_init(&state->ctr_drbg);
mbedtls_entropy_init(&state->entropy);
state->net_ctx.fd = fd;
if (mbedtls_ctr_drbg_seed(&state->ctr_drbg, mbedtls_entropy_func, &state->entropy, (const unsigned char*)pers, strlen(pers)) != 0)
goto error;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
if (mbedtls_x509_crt_parse(&state->ca, (const unsigned char*)cacert_pem, sizeof(cacert_pem) / sizeof(cacert_pem[0])) < 0)
goto error;
#endif
return state;
error:
if (state)
free(state);
return NULL;
}
int ssl_socket_connect(void *state_data,
void *data, bool timeout_enable, bool nonblock)
{
int ret, flags;
struct ssl_state *state = (struct ssl_state*)state_data;
if (timeout_enable)
{
if (!socket_connect_with_timeout(state->net_ctx.fd, data, 5000))
return -1;
/* socket_connect_with_timeout makes the socket non-blocking. */
if (!socket_set_block(state->net_ctx.fd, true))
return -1;
}
else
{
if (socket_connect(state->net_ctx.fd, data))
return -1;
}
if (mbedtls_ssl_config_defaults(&state->conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT) != 0)
return -1;
mbedtls_ssl_conf_authmode(&state->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
mbedtls_ssl_conf_ca_chain(&state->conf, &state->ca, NULL);
mbedtls_ssl_conf_rng(&state->conf, mbedtls_ctr_drbg_random, &state->ctr_drbg);
mbedtls_ssl_conf_dbg(&state->conf, ssl_debug, stderr);
if (mbedtls_ssl_setup(&state->ctx, &state->conf) != 0)
return -1;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
if (mbedtls_ssl_set_hostname(&state->ctx, state->domain) != 0)
return -1;
#endif
mbedtls_ssl_set_bio(&state->ctx, &state->net_ctx, mbedtls_net_send, mbedtls_net_recv, NULL);
while ((ret = mbedtls_ssl_handshake(&state->ctx)) != 0)
{
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE)
return -1;
}
if ((flags = mbedtls_ssl_get_verify_result(&state->ctx)) != 0)
{
char vrfy_buf[512];
mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), " ! ", flags);
}
return state->net_ctx.fd;
}
ssize_t ssl_socket_receive_all_nonblocking(void *state_data,
bool *error, void *data_, size_t size)
{
ssize_t ret;
struct ssl_state *state = (struct ssl_state*)state_data;
const uint8_t *data = (const uint8_t*)data_;
/* mbedtls_ssl_read wants non-const data but it only reads it, so this cast is safe */
mbedtls_net_set_nonblock(&state->net_ctx);
ret = mbedtls_ssl_read(&state->ctx, (unsigned char*)data, size);
if (ret > 0)
return ret;
if (ret == 0)
{
/* Socket closed */
*error = true;
return -1;
}
if (isagain((int)ret) || ret == MBEDTLS_ERR_SSL_WANT_READ)
return 0;
*error = true;
return -1;
}
int ssl_socket_receive_all_blocking(void *state_data,
void *data_, size_t size)
{
struct ssl_state *state = (struct ssl_state*)state_data;
const uint8_t *data = (const uint8_t*)data_;
mbedtls_net_set_block(&state->net_ctx);
for (;;)
{
/* mbedtls_ssl_read wants non-const data but it only reads it,
* so this cast is safe */
int ret = mbedtls_ssl_read(&state->ctx, (unsigned char*)data, size);
if ( ret == MBEDTLS_ERR_SSL_WANT_READ ||
ret == MBEDTLS_ERR_SSL_WANT_WRITE)
continue;
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
break;
if (ret == 0)
break; /* normal EOF */
if (ret < 0)
return -1;
}
return 1;
}
int ssl_socket_send_all_blocking(void *state_data,
const void *data_, size_t size, bool no_signal)
{
int ret;
struct ssl_state *state = (struct ssl_state*)state_data;
const uint8_t *data = (const uint8_t*)data_;
mbedtls_net_set_block(&state->net_ctx);
while (size)
{
ret = mbedtls_ssl_write(&state->ctx, data, size);
if (!ret)
continue;
if (ret < 0)
{
if ( ret != MBEDTLS_ERR_SSL_WANT_READ &&
ret != MBEDTLS_ERR_SSL_WANT_WRITE)
return false;
}
else
{
data += ret;
size -= ret;
}
}
return true;
}
ssize_t ssl_socket_send_all_nonblocking(void *state_data,
const void *data_, size_t size, bool no_signal)
{
int ret;
ssize_t sent = size;
struct ssl_state *state = (struct ssl_state*)state_data;
const uint8_t *data = (const uint8_t*)data_;
mbedtls_net_set_nonblock(&state->net_ctx);
ret = mbedtls_ssl_write(&state->ctx, data, size);
if (ret <= 0)
return -1;
return sent;
}
void ssl_socket_close(void *state_data)
{
struct ssl_state *state = (struct ssl_state*)state_data;
mbedtls_ssl_close_notify(&state->ctx);
socket_close(state->net_ctx.fd);
}
void ssl_socket_free(void *state_data)
{
struct ssl_state *state = (struct ssl_state*)state_data;
if (!state)
return;
mbedtls_ssl_free(&state->ctx);
mbedtls_ssl_config_free(&state->conf);
mbedtls_ctr_drbg_free(&state->ctr_drbg);
mbedtls_entropy_free(&state->entropy);
#if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_x509_crt_free(&state->ca);
#endif
free(state);
}
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