Diff: mbedtls/source/ssl_cookie.c

Revision:

13:bed103425508

Parent:

12:0071cb144c7a

Child:

14:79bcbfbb93c7

--- a/mbedtls/source/ssl_cookie.c	Tue Nov 01 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,260 +0,0 @@
-/*
- *  DTLS cookie callbacks implementation
- *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
- */
-/*
- * These session callbacks use a simple chained list
- * to store and retrieve the session information.
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_SSL_COOKIE_C)
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#define mbedtls_calloc    calloc
-#define mbedtls_free      free
-#endif
-
-#include "mbedtls/ssl_cookie.h"
-#include "mbedtls/ssl_internal.h"
-
-#include <string.h>
-
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
-    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
-}
-
-/*
- * If DTLS is in use, then at least one of SHA-1, SHA-256, SHA-512 is
- * available. Try SHA-256 first, 512 wastes resources since we need to stay
- * with max 32 bytes of cookie for DTLS 1.0
- */
-#if defined(MBEDTLS_SHA256_C)
-#define COOKIE_MD           MBEDTLS_MD_SHA224
-#define COOKIE_MD_OUTLEN    32
-#define COOKIE_HMAC_LEN     28
-#elif defined(MBEDTLS_SHA512_C)
-#define COOKIE_MD           MBEDTLS_MD_SHA384
-#define COOKIE_MD_OUTLEN    48
-#define COOKIE_HMAC_LEN     28
-#elif defined(MBEDTLS_SHA1_C)
-#define COOKIE_MD           MBEDTLS_MD_SHA1
-#define COOKIE_MD_OUTLEN    20
-#define COOKIE_HMAC_LEN     20
-#else
-#error "DTLS hello verify needs SHA-1 or SHA-2"
-#endif
-
-/*
- * Cookies are formed of a 4-bytes timestamp (or serial number) and
- * an HMAC of timestemp and client ID.
- */
-#define COOKIE_LEN      ( 4 + COOKIE_HMAC_LEN )
-
-void mbedtls_ssl_cookie_init( mbedtls_ssl_cookie_ctx *ctx )
-{
-    mbedtls_md_init( &ctx->hmac_ctx );
-#if !defined(MBEDTLS_HAVE_TIME)
-    ctx->serial = 0;
-#endif
-    ctx->timeout = MBEDTLS_SSL_COOKIE_TIMEOUT;
-
-#if defined(MBEDTLS_THREADING_C)
-    mbedtls_mutex_init( &ctx->mutex );
-#endif
-}
-
-void mbedtls_ssl_cookie_set_timeout( mbedtls_ssl_cookie_ctx *ctx, unsigned long delay )
-{
-    ctx->timeout = delay;
-}
-
-void mbedtls_ssl_cookie_free( mbedtls_ssl_cookie_ctx *ctx )
-{
-    mbedtls_md_free( &ctx->hmac_ctx );
-
-#if defined(MBEDTLS_THREADING_C)
-    mbedtls_mutex_init( &ctx->mutex );
-#endif
-
-    mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_cookie_ctx ) );
-}
-
-int mbedtls_ssl_cookie_setup( mbedtls_ssl_cookie_ctx *ctx,
-                      int (*f_rng)(void *, unsigned char *, size_t),
-                      void *p_rng )
-{
-    int ret;
-    unsigned char key[COOKIE_MD_OUTLEN];
-
-    if( ( ret = f_rng( p_rng, key, sizeof( key ) ) ) != 0 )
-        return( ret );
-
-    ret = mbedtls_md_setup( &ctx->hmac_ctx, mbedtls_md_info_from_type( COOKIE_MD ), 1 );
-    if( ret != 0 )
-        return( ret );
-
-    ret = mbedtls_md_hmac_starts( &ctx->hmac_ctx, key, sizeof( key ) );
-    if( ret != 0 )
-        return( ret );
-
-    mbedtls_zeroize( key, sizeof( key ) );
-
-    return( 0 );
-}
-
-/*
- * Generate the HMAC part of a cookie
- */
-static int ssl_cookie_hmac( mbedtls_md_context_t *hmac_ctx,
-                            const unsigned char time[4],
-                            unsigned char **p, unsigned char *end,
-                            const unsigned char *cli_id, size_t cli_id_len )
-{
-    unsigned char hmac_out[COOKIE_MD_OUTLEN];
-
-    if( (size_t)( end - *p ) < COOKIE_HMAC_LEN )
-        return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
-
-    if( mbedtls_md_hmac_reset(  hmac_ctx ) != 0 ||
-        mbedtls_md_hmac_update( hmac_ctx, time, 4 ) != 0 ||
-        mbedtls_md_hmac_update( hmac_ctx, cli_id, cli_id_len ) != 0 ||
-        mbedtls_md_hmac_finish( hmac_ctx, hmac_out ) != 0 )
-    {
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-
-    memcpy( *p, hmac_out, COOKIE_HMAC_LEN );
-    *p += COOKIE_HMAC_LEN;
-
-    return( 0 );
-}
-
-/*
- * Generate cookie for DTLS ClientHello verification
- */
-int mbedtls_ssl_cookie_write( void *p_ctx,
-                      unsigned char **p, unsigned char *end,
-                      const unsigned char *cli_id, size_t cli_id_len )
-{
-    int ret;
-    mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
-    unsigned long t;
-
-    if( ctx == NULL || cli_id == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-
-    if( (size_t)( end - *p ) < COOKIE_LEN )
-        return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
-
-#if defined(MBEDTLS_HAVE_TIME)
-    t = (unsigned long) mbedtls_time( NULL );
-#else
-    t = ctx->serial++;
-#endif
-
-    (*p)[0] = (unsigned char)( t >> 24 );
-    (*p)[1] = (unsigned char)( t >> 16 );
-    (*p)[2] = (unsigned char)( t >>  8 );
-    (*p)[3] = (unsigned char)( t       );
-    *p += 4;
-
-#if defined(MBEDTLS_THREADING_C)
-    if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR + ret );
-#endif
-
-    ret = ssl_cookie_hmac( &ctx->hmac_ctx, *p - 4,
-                           p, end, cli_id, cli_id_len );
-
-#if defined(MBEDTLS_THREADING_C)
-    if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR +
-                MBEDTLS_ERR_THREADING_MUTEX_ERROR );
-#endif
-
-    return( ret );
-}
-
-/*
- * Check a cookie
- */
-int mbedtls_ssl_cookie_check( void *p_ctx,
-                      const unsigned char *cookie, size_t cookie_len,
-                      const unsigned char *cli_id, size_t cli_id_len )
-{
-    unsigned char ref_hmac[COOKIE_HMAC_LEN];
-    int ret = 0;
-    unsigned char *p = ref_hmac;
-    mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
-    unsigned long cur_time, cookie_time;
-
-    if( ctx == NULL || cli_id == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-
-    if( cookie_len != COOKIE_LEN )
-        return( -1 );
-
-#if defined(MBEDTLS_THREADING_C)
-    if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR + ret );
-#endif
-
-    if( ssl_cookie_hmac( &ctx->hmac_ctx, cookie,
-                         &p, p + sizeof( ref_hmac ),
-                         cli_id, cli_id_len ) != 0 )
-        ret = -1;
-
-#if defined(MBEDTLS_THREADING_C)
-    if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR +
-                MBEDTLS_ERR_THREADING_MUTEX_ERROR );
-#endif
-
-    if( ret != 0 )
-        return( ret );
-
-    if( mbedtls_ssl_safer_memcmp( cookie + 4, ref_hmac, sizeof( ref_hmac ) ) != 0 )
-        return( -1 );
-
-#if defined(MBEDTLS_HAVE_TIME)
-    cur_time = (unsigned long) mbedtls_time( NULL );
-#else
-    cur_time = ctx->serial;
-#endif
-
-    cookie_time = ( (unsigned long) cookie[0] << 24 ) |
-                  ( (unsigned long) cookie[1] << 16 ) |
-                  ( (unsigned long) cookie[2] <<  8 ) |
-                  ( (unsigned long) cookie[3]       );
-
-    if( ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout )
-        return( -1 );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_COOKIE_C */