Commit 232edd46 authored by Manuel Pégourié-Gonnard's avatar Manuel Pégourié-Gonnard Committed by Paul Bakker

Move cookie callbacks implementation to own module

parent d485d194
......@@ -1083,8 +1083,6 @@ void ssl_set_bio( ssl_context *ssl,
* network stack. Used for HelloVerifyRequest with DTLS.
* This is *not* used to route the actual packets.
*
* \warning (TODO-DTLS) May change and even be removed before 2.0.0!
*
* \param ssl SSL context
* \param info Transport-level info identifying the client (eg IP + port)
* \param ilen Length of info in bytes
......@@ -1147,45 +1145,6 @@ void ssl_set_dtls_cookies( ssl_context *ssl,
ssl_cookie_write_t *f_cookie_write,
ssl_cookie_check_t *f_cookie_check,
void *p_cookie );
/* Note: the next things up to endif are to be moved in a separate module */
/**
* \brief Default cookie generation function.
* (See description of ssl_cookie_write_t.)
*/
ssl_cookie_write_t ssl_cookie_write;
/**
* \brief Default cookie verification function.
* (See description of ssl_cookie_check_t.)
*/
ssl_cookie_check_t ssl_cookie_check;
/**
* \brief Context for the default cookie functions.
*/
typedef struct
{
md_context_t hmac_ctx;
} ssl_cookie_ctx;
/**
* \brief Initialize cookie context
*/
void ssl_cookie_init( ssl_cookie_ctx *ctx );
/**
* \brief Setup cookie context (generate keys)
*/
int ssl_cookie_setup( ssl_cookie_ctx *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Free cookie context
*/
void ssl_cookie_free( ssl_cookie_ctx *ctx );
#endif /* POLARSSL_SSL_DTLS_HELLO_VERIFY */
/**
......
/**
* \file ssl_cookie.h
*
* \brief DTLS cookie callbacks implementation
*
* Copyright (C) 2014, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_SSL_COOKIE_H
#define POLARSSL_SSL_COOKIE_H
#include "ssl.h"
/**
* \name SECTION: Module settings
*
* The configuration options you can set for this module are in this section.
* Either change them in config.h or define them on the compiler command line.
* \{
*/
/* \} name SECTION: Module settings */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Context for the default cookie functions.
*/
typedef struct
{
md_context_t hmac_ctx;
} ssl_cookie_ctx;
/**
* \brief Initialize cookie context
*/
void ssl_cookie_init( ssl_cookie_ctx *ctx );
/**
* \brief Setup cookie context (generate keys)
*/
int ssl_cookie_setup( ssl_cookie_ctx *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Free cookie context
*/
void ssl_cookie_free( ssl_cookie_ctx *ctx );
/**
* \brief Generate cookie, see \c ssl_cookie_write_t
*/
ssl_cookie_write_t ssl_cookie_write;
/**
* \brief Verify cookie, see \c ssl_cookie_write_t
*/
ssl_cookie_check_t ssl_cookie_check;
#ifdef __cplusplus
}
#endif
#endif /* ssl_cookie.h */
......@@ -55,6 +55,7 @@ set(src
sha256.c
sha512.c
ssl_cache.c
ssl_cookie.c
ssl_ciphersuites.c
ssl_cli.c
ssl_srv.c
......
......@@ -55,6 +55,7 @@ OBJS= aes.o aesni.o arc4.o \
pkwrite.o platform.o ripemd160.o \
rsa.o sha1.o sha256.o \
sha512.o ssl_cache.o ssl_cli.o \
ssl_cookie.o \
ssl_srv.o ssl_ciphersuites.o \
ssl_tls.o threading.o timing.o \
version.o version_features.o \
......
/*
* DTLS cookie callbacks implementation
*
* Copyright (C) 2014, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* These session callbacks use a simple chained list
* to store and retrieve the session information.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
#include "polarssl/ssl_cookie.h"
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_malloc malloc
#define polarssl_free free
#endif
/* Implementation that should never be optimized out by the compiler */
static void polarssl_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(POLARSSL_SHA256_C)
#define HVR_MD POLARSSL_MD_SHA256
#define HVR_MD_LEN 32
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA512_C)
#define HVR_MD POLARSSL_MD_SHA384
#define HVR_MD_LEN 48
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA1_C)
#define HVR_MD POLARSSL_MD_SHA1
#define HVR_MD_LEN 20
#define HVR_MD_USE 20
#else
#error "DTLS hello verify needs SHA-1 or SHA-2"
#endif
void ssl_cookie_init( ssl_cookie_ctx *ctx )
{
md_init( &ctx->hmac_ctx );
}
void ssl_cookie_free( ssl_cookie_ctx *ctx )
{
md_free( &ctx->hmac_ctx );
}
int ssl_cookie_setup( ssl_cookie_ctx *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
unsigned char key[HVR_MD_LEN];
if( ( ret = f_rng( p_rng, key, sizeof( key ) ) ) != 0 )
return( ret );
ret = md_init_ctx( &ctx->hmac_ctx, md_info_from_type( HVR_MD ) );
if( ret != 0 )
return( ret );
ret = md_hmac_starts( &ctx->hmac_ctx, key, sizeof( key ) );
if( ret != 0 )
return( ret );
polarssl_zeroize( key, sizeof( key ) );
return( 0 );
}
/*
* Generate cookie for DTLS ClientHello verification
*/
int ssl_cookie_write( void *ctx,
unsigned char **p, unsigned char *end,
const unsigned char *cli_id, size_t cli_id_len )
{
int ret;
unsigned char hmac_out[HVR_MD_LEN];
md_context_t *hmac_ctx = (md_context_t *) ctx;
if( (size_t)( end - *p ) < HVR_MD_USE )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
if( ( ret = md_hmac_reset( hmac_ctx ) ) != 0 ||
( ret = md_hmac_update( hmac_ctx, cli_id, cli_id_len ) ) != 0 ||
( ret = md_hmac_finish( hmac_ctx, hmac_out ) ) != 0 )
{
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
memcpy( *p, hmac_out, HVR_MD_USE );
*p += HVR_MD_USE;
return( 0 );
}
/*
* Check a cookie
*/
int ssl_cookie_check( void *ctx,
const unsigned char *cookie, size_t cookie_len,
const unsigned char *cli_id, size_t cli_id_len )
{
unsigned char ref_cookie[HVR_MD_USE];
unsigned char *p = ref_cookie;
md_context_t *hmac_ctx = (md_context_t *) ctx;
if( cookie_len != HVR_MD_USE )
return( -1 );
if( ssl_cookie_write( hmac_ctx,
&p, p + sizeof( ref_cookie ),
cli_id, cli_id_len ) != 0 )
return( -1 );
if( safer_memcmp( cookie, ref_cookie, sizeof( ref_cookie ) ) != 0 )
return( -1 );
return( 0 );
}
#endif /* POLARSSL_SSL_COOKIE_C */
......@@ -1146,115 +1146,6 @@ have_ciphersuite_v2:
}
#endif /* POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
/*
* 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(POLARSSL_SHA256_C)
#define HVR_MD POLARSSL_MD_SHA256
#define HVR_MD_LEN 32
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA512_C)
#define HVR_MD POLARSSL_MD_SHA384
#define HVR_MD_LEN 48
#define HVR_MD_USE 32
#elif defined(POLARSSL_SHA1_C)
#define HVR_MD POLARSSL_MD_SHA1
#define HVR_MD_LEN 20
#define HVR_MD_USE 20
#else
#error "DTLS hello verify needs SHA-1 or SHA-2"
#endif
void ssl_cookie_init( ssl_cookie_ctx *ctx )
{
md_init( &ctx->hmac_ctx );
}
void ssl_cookie_free( ssl_cookie_ctx *ctx )
{
md_free( &ctx->hmac_ctx );
}
int ssl_cookie_setup( ssl_cookie_ctx *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
unsigned char key[HVR_MD_LEN];
if( ( ret = f_rng( p_rng, key, sizeof( key ) ) ) != 0 )
return( ret );
ret = md_init_ctx( &ctx->hmac_ctx, md_info_from_type( HVR_MD ) );
if( ret != 0 )
return( ret );
ret = md_hmac_starts( &ctx->hmac_ctx, key, sizeof( key ) );
if( ret != 0 )
return( ret );
polarssl_zeroize( key, sizeof( key ) );
return( 0 );
}
/*
* Generate cookie for DTLS ClientHello verification
*/
int ssl_cookie_write( void *ctx,
unsigned char **p, unsigned char *end,
const unsigned char *cli_id, size_t cli_id_len )
{
int ret;
unsigned char hmac_out[HVR_MD_LEN];
md_context_t *hmac_ctx = (md_context_t *) ctx;
if( (size_t)( end - *p ) < HVR_MD_USE )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
if( ( ret = md_hmac_reset( hmac_ctx ) ) != 0 ||
( ret = md_hmac_update( hmac_ctx, cli_id, cli_id_len ) ) != 0 ||
( ret = md_hmac_finish( hmac_ctx, hmac_out ) ) != 0 )
{
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
memcpy( *p, hmac_out, HVR_MD_USE );
*p += HVR_MD_USE;
return( 0 );
}
/*
* Check a cookie
*/
int ssl_cookie_check( void *ctx,
const unsigned char *cookie, size_t cookie_len,
const unsigned char *cli_id, size_t cli_id_len )
{
unsigned char ref_cookie[HVR_MD_USE];
unsigned char *p = ref_cookie;
md_context_t *hmac_ctx = (md_context_t *) ctx;
if( cookie_len != HVR_MD_USE )
return( -1 );
if( ssl_cookie_write( hmac_ctx,
&p, p + sizeof( ref_cookie ),
cli_id, cli_id_len ) != 0 )
return( -1 );
if( safer_memcmp( cookie, ref_cookie, sizeof( ref_cookie ) ) != 0 )
return( -1 );
return( 0 );
}
#endif /* POLARSSL_SSL_DTLS_HELLO_VERIFY */
static int ssl_parse_client_hello( ssl_context *ssl )
{
int ret;
......@@ -1571,7 +1462,7 @@ static int ssl_parse_client_hello( ssl_context *ssl )
}
SSL_DEBUG_MSG( 2, ( "client hello, cookie verification skipped" ) );
#endif
#endif /* POLARSSL_SSL_DTLS_HELLO_VERIFY */
}
#endif /* POLARSSL_SSL_PROTO_DTLS */
......
......@@ -81,6 +81,10 @@ int main( int argc, char *argv[] )
#include "polarssl/ssl_cache.h"
#endif
#if defined(POLARSSL_SSL_DTLS_HELLO_VERIFY)
#include "polarssl/ssl_cookie.h"
#endif
#if defined(POLARSSL_MEMORY_BUFFER_ALLOC_C)
#include "polarssl/memory.h"
#endif
......
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