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Add support for ECDHE_PSK key exchange

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-10-11 16:53:50 +02:00
parent d93d28e370
commit 3ce3bbdc00
5 changed files with 197 additions and 24 deletions
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17
include/polarssl/config.h
View file

@ -280,6 +280,18 @@
*/
#define POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED
/**
* \def POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED
*
* Enable the ECDHE-PSK based ciphersuite modes in SSL / TLS.
*
* Requires: POLARSSL_ECDH_C
*
* This enables the following ciphersuites (if other requisites are
* enabled as well):
*/
#define POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED
/**
* \def POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED
*
@ -1736,6 +1748,11 @@
#error "POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED defined, but not all prerequisites"
#endif
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED) && \
!defined(POLARSSL_ECDH_C)
#error "POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED defined, but not all prerequisites"
#endif
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
( !defined(POLARSSL_DHM_C) || !defined(POLARSSL_RSA_C) || \
!defined(POLARSSL_X509_CRT_PARSE_C) || !defined(POLARSSL_PKCS1_V15) )

1
include/polarssl/ssl_ciphersuites.h
View file

@ -166,6 +166,7 @@ typedef enum {
POLARSSL_KEY_EXCHANGE_PSK,
POLARSSL_KEY_EXCHANGE_DHE_PSK,
POLARSSL_KEY_EXCHANGE_RSA_PSK,
POLARSSL_KEY_EXCHANGE_ECDHE_PSK,
} key_exchange_type_t;
typedef struct _ssl_ciphersuite_t ssl_ciphersuite_t;

103
library/ssl_cli.c
View file

@ -1106,7 +1106,8 @@ static int ssl_parse_server_dh_params( ssl_context *ssl, unsigned char **p,
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_server_ecdh_params( ssl_context *ssl,
unsigned char **p,
unsigned char *end )
@ -1143,10 +1144,12 @@ static int ssl_parse_server_ecdh_params( ssl_context *ssl,
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_server_psk_hint( ssl_context *ssl,
unsigned char **p,
unsigned char *end )
@ -1177,7 +1180,8 @@ static int ssl_parse_server_psk_hint( ssl_context *ssl,
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_SSL_PROTO_TLS1_2)
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
@ -1254,7 +1258,8 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_RSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_PSK &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
ssl->state++;
@ -1352,6 +1357,25 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
unsigned char *p = ssl->in_msg + 4;
unsigned char *end = ssl->in_msg + ssl->in_hslen;
if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
{
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
@ -1880,6 +1904,75 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
unsigned char *p = ssl->handshake->premaster;
/*
* ECDHE_PSK key exchange: RFC 5489, section 2
*
* opaque psk_identity<0..2^16-1>;
* ClientECDiffieHellmanPublic public;
*/
if( ssl->psk == NULL )
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
if( sizeof(ssl->handshake->premaster) < 4 + ssl->psk_identity_len )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
i = 4;
n = ssl->psk_identity_len;
ssl->out_msg[4] = (unsigned char)( n >> 8 );
ssl->out_msg[5] = (unsigned char)( n );
memcpy( ssl->out_msg + 6, ssl->psk_identity, ssl->psk_identity_len );
ret = ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
&ssl->out_msg[8 + ssl->psk_identity_len], 512,
ssl->f_rng, ssl->p_rng );
if( ret != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_make_public", ret );
return( ret );
}
ssl->out_msg[6 + ssl->psk_identity_len] = (unsigned char)( n >> 8 );
ssl->out_msg[7 + ssl->psk_identity_len] = (unsigned char)( n );
SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
/*
* PMS = struct {
* opaque other_secret<0..2^16-1>;
* opaque psk<0..2^16-1>;
* };
* with "other_secret" containing Z from ECDH
*/
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &n,
p + 2, POLARSSL_MPI_MAX_SIZE,
ssl->f_rng, ssl->p_rng ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
return( ret );
}
*(p++) = (unsigned char)( n >> 8 );
*(p++) = (unsigned char)( n );
p += n;
SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
*(p++) = (unsigned char)( ssl->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->psk_len );
memcpy( p, ssl->psk, ssl->psk_len );
p += ssl->psk_len;
ssl->handshake->pmslen = 4 + n + ssl->psk_len;
n = ssl->handshake->pmslen;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA )
{

88
library/ssl_srv.c
View file

@ -1750,7 +1750,8 @@ static int ssl_write_certificate_request( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
ssl->state++;
@ -1776,6 +1777,7 @@ static int ssl_write_certificate_request( ssl_context *ssl )
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ||
ssl->authmode == SSL_VERIFY_NONE )
{
SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
@ -1928,15 +1930,18 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
if( ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_RSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_RSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
ssl->state++;
return( 0 );
}
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
/* TODO: Support identity hints */
*(p++) = 0x00;
@ -1944,7 +1949,8 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
n += 2;
}
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
@ -1991,9 +1997,12 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
/*
* Ephemeral ECDH parameters:
@ -2031,7 +2040,8 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q );
}
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
@ -2278,10 +2288,11 @@ static int ssl_parse_client_dh_public( ssl_context *ssl, unsigned char **p,
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_client_ecdh_public( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
int ret;
size_t n;
/*
@ -2308,7 +2319,8 @@ static int ssl_parse_client_ecdh_public( ssl_context *ssl )
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
@ -2380,7 +2392,8 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
#endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_client_psk_identity( ssl_context *ssl, unsigned char **p,
const unsigned char *end )
{
@ -2447,7 +2460,8 @@ static int ssl_parse_client_psk_identity( ssl_context *ssl, unsigned char **p,
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
static int ssl_parse_client_key_exchange( ssl_context *ssl )
{
@ -2490,7 +2504,6 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len;
/* No blinding needed for DHE, but will be needed for fixed DH! */
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
ssl->handshake->premaster,
&ssl->handshake->pmslen,
@ -2584,7 +2597,6 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
n = ssl->handshake->dhm_ctx.len;
/* No blinding needed since this is ephemeral DHM */
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
p, &n, ssl->f_rng, ssl->p_rng ) ) != 0 )
{
@ -2605,6 +2617,52 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
size_t n;
unsigned char *p = ssl->in_msg + 4;
unsigned char *end = ssl->in_msg + ssl->in_msglen;
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
return( ret );
}
if( ( ret = ssl_parse_client_ecdh_public( ssl ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_ecdh_public" ), ret );
return( ret );
}
// Set up the premaster secret
//
p = ssl->handshake->premaster;
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &n,
p + 2, POLARSSL_MPI_MAX_SIZE,
ssl->f_rng, ssl->p_rng ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
return( ret );
}
*(p++) = (unsigned char)( n >> 8 );
*(p++) = (unsigned char)( n );
p += n;
SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
*(p++) = (unsigned char)( ssl->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->psk_len );
memcpy( p, ssl->psk, ssl->psk_len );
p += ssl->psk_len;
ssl->handshake->pmslen = 4 + n + ssl->psk_len;
n = ssl->handshake->pmslen;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA )
{

12
library/ssl_tls.c
View file

@ -2241,7 +2241,8 @@ int ssl_write_certificate( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
ssl->state++;
@ -2260,7 +2261,8 @@ int ssl_parse_certificate( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
ssl->state++;
@ -2281,7 +2283,8 @@ int ssl_write_certificate( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
ssl->state++;
@ -2390,7 +2393,8 @@ int ssl_parse_certificate( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
ssl->state++;