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DHE-PSK based ciphersuite support added and cleaner key exchange based

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The base RFC 4279 DHE-PSK ciphersuites are now supported and added.

The SSL code cuts out code not relevant for defined key exchange methods
This commit is contained in:
Paul Bakker
2013-04-19 14:30:58 +02:00
parent 188c8de430
commit 48f7a5d724
6 changed files with 581 additions and 283 deletions
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568
library/ssl_srv.c
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@ -1020,28 +1020,47 @@ static int ssl_write_server_hello( ssl_context *ssl )
return( ret );
}
#if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \
!defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
!defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
static int ssl_write_certificate_request( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
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 )
{
SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
ssl->state++;
return( 0 );
}
return( ret );
}
#else
static int ssl_write_certificate_request( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
#if defined(POLARSSL_X509_PARSE_C)
size_t n = 0, dn_size, total_dn_size;
unsigned char *buf, *p;
const x509_cert *crt;
#endif /* POLARSSL_X509_PARSE_C */
SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
ssl->state++;
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
ssl->authmode == SSL_VERIFY_NONE )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
return( 0 );
}
#if defined(POLARSSL_X509_PARSE_C)
/*
* 0 . 0 handshake type
* 1 . 3 handshake length
@ -1117,30 +1136,25 @@ static int ssl_write_certificate_request( ssl_context *ssl )
ssl->out_msg[7 + n] = (unsigned char)( total_dn_size );
ret = ssl_write_record( ssl );
#endif /* POLARSSL_X509_PARSE_C */
SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
return( ret );
}
#endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED &&
!POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED &&
!POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
#if ( !defined(POLARSSL_DHM_C) && !defined(POLARSSL_ECDH_C) ) || \
!defined(POLARSSL_RSA_C)
static int ssl_write_server_key_exchange( ssl_context *ssl )
{
SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
ssl->state++;
return( 0 );
}
#else
static int ssl_write_server_key_exchange( ssl_context *ssl )
{
int ret;
size_t n, rsa_key_len = 0;
size_t n = 0, len;
unsigned char hash[64];
md_type_t md_alg = POLARSSL_MD_NONE;
unsigned int hashlen = 0;
unsigned char *p = ssl->out_msg + 4;
unsigned char *dig_sig = p;
size_t dig_sig_len = 0;
const ssl_ciphersuite_t *ciphersuite_info;
ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
@ -1148,22 +1162,37 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
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_RSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
ssl->state++;
return( 0 );
}
#if defined(POLARSSL_RSA_C)
if( ssl->rsa_key == NULL )
{
SSL_DEBUG_MSG( 1, ( "got no private key" ) );
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
}
#endif /* POLARSSL_RSA_C */
#if defined(POLARSSL_DHM_C)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA )
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
/* TODO: Support identity hints */
*(p++) = 0x00;
*(p++) = 0x00;
n += 2;
}
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
/*
* Ephemeral DH parameters:
@ -1183,21 +1212,28 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
if( ( ret = dhm_make_params( &ssl->handshake->dhm_ctx,
mpi_size( &ssl->handshake->dhm_ctx.P ),
ssl->out_msg + 4,
&n, ssl->f_rng, ssl->p_rng ) ) != 0 )
p,
&len, ssl->f_rng, ssl->p_rng ) ) != 0 )
{
SSL_DEBUG_RET( 1, "dhm_make_params", ret );
return( ret );
}
dig_sig = p;
dig_sig_len = len;
p += len;
n += len;
SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
}
#endif /* POLARSSL_DHM_C */
#endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_ECDH_C)
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
{
/*
@ -1217,138 +1253,156 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
}
if( ( ret = ecdh_make_params( &ssl->handshake->ecdh_ctx,
&n,
ssl->out_msg + 4,
&len,
p,
1000, ssl->f_rng, ssl->p_rng ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_make_params", ret );
return( ret );
}
dig_sig = p;
dig_sig_len = len;
p += len;
n += len;
SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q );
}
#endif /* POLARSSL_ECDH_INIT */
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
if( ssl->minor_ver != SSL_MINOR_VERSION_3 )
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
{
md5_context md5;
sha1_context sha1;
size_t rsa_key_len = 0;
/*
* digitally-signed struct {
* opaque md5_hash[16];
* opaque sha_hash[20];
* };
*
* md5_hash
* MD5(ClientHello.random + ServerHello.random
* + ServerParams);
* sha_hash
* SHA(ClientHello.random + ServerHello.random
* + ServerParams);
*/
md5_starts( &md5 );
md5_update( &md5, ssl->handshake->randbytes, 64 );
md5_update( &md5, ssl->out_msg + 4, n );
md5_finish( &md5, hash );
sha1_starts( &sha1 );
sha1_update( &sha1, ssl->handshake->randbytes, 64 );
sha1_update( &sha1, ssl->out_msg + 4, n );
sha1_finish( &sha1, hash + 16 );
hashlen = 36;
md_alg = POLARSSL_MD_NONE;
}
else
{
md_context_t ctx;
/*
* digitally-signed struct {
* opaque client_random[32];
* opaque server_random[32];
* ServerDHParams params;
* };
*/
switch( ssl->handshake->sig_alg )
if( ssl->minor_ver != SSL_MINOR_VERSION_3 )
{
md5_context md5;
sha1_context sha1;
/*
* digitally-signed struct {
* opaque md5_hash[16];
* opaque sha_hash[20];
* };
*
* md5_hash
* MD5(ClientHello.random + ServerHello.random
* + ServerParams);
* sha_hash
* SHA(ClientHello.random + ServerHello.random
* + ServerParams);
*/
md5_starts( &md5 );
md5_update( &md5, ssl->handshake->randbytes, 64 );
md5_update( &md5, dig_sig, dig_sig_len );
md5_finish( &md5, hash );
sha1_starts( &sha1 );
sha1_update( &sha1, ssl->handshake->randbytes, 64 );
sha1_update( &sha1, dig_sig, dig_sig_len );
sha1_finish( &sha1, hash + 16 );
hashlen = 36;
md_alg = POLARSSL_MD_NONE;
}
else
{
md_context_t ctx;
/*
* digitally-signed struct {
* opaque client_random[32];
* opaque server_random[32];
* ServerDHParams params;
* };
*/
switch( ssl->handshake->sig_alg )
{
#if defined(POLARSSL_MD5_C)
case SSL_HASH_MD5:
md_alg = POLARSSL_MD_MD5;
break;
case SSL_HASH_MD5:
md_alg = POLARSSL_MD_MD5;
break;
#endif
#if defined(POLARSSL_SHA1_C)
case SSL_HASH_SHA1:
md_alg = POLARSSL_MD_SHA1;
break;
case SSL_HASH_SHA1:
md_alg = POLARSSL_MD_SHA1;
break;
#endif
#if defined(POLARSSL_SHA2_C)
case SSL_HASH_SHA224:
md_alg = POLARSSL_MD_SHA224;
break;
case SSL_HASH_SHA256:
md_alg = POLARSSL_MD_SHA256;
break;
case SSL_HASH_SHA224:
md_alg = POLARSSL_MD_SHA224;
break;
case SSL_HASH_SHA256:
md_alg = POLARSSL_MD_SHA256;
break;
#endif
#if defined(POLARSSL_SHA4_C)
case SSL_HASH_SHA384:
md_alg = POLARSSL_MD_SHA384;
break;
case SSL_HASH_SHA512:
md_alg = POLARSSL_MD_SHA512;
break;
case SSL_HASH_SHA384:
md_alg = POLARSSL_MD_SHA384;
break;
case SSL_HASH_SHA512:
md_alg = POLARSSL_MD_SHA512;
break;
#endif
default:
/* Should never happen */
return( -1 );
default:
/* Should never happen */
return( -1 );
}
if( ( ret = md_init_ctx( &ctx, md_info_from_type( md_alg ) ) ) != 0 )
{
SSL_DEBUG_RET( 1, "md_init_ctx", ret );
return( ret );
}
md_starts( &ctx );
md_update( &ctx, ssl->handshake->randbytes, 64 );
md_update( &ctx, dig_sig, dig_sig_len );
md_finish( &ctx, hash );
}
if( ( ret = md_init_ctx( &ctx, md_info_from_type( md_alg ) ) ) != 0 )
SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
if ( ssl->rsa_key )
rsa_key_len = ssl->rsa_key_len( ssl->rsa_key );
if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
{
SSL_DEBUG_RET( 1, "md_init_ctx", ret );
*(p++) = ssl->handshake->sig_alg;
*(p++) = SSL_SIG_RSA;
n += 2;
}
*(p++) = (unsigned char)( rsa_key_len >> 8 );
*(p++) = (unsigned char)( rsa_key_len );
n += 2;
if ( ssl->rsa_key )
{
ret = ssl->rsa_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
RSA_PRIVATE, md_alg, hashlen, hash, p );
}
if( ret != 0 )
{
SSL_DEBUG_RET( 1, "pkcs1_sign", ret );
return( ret );
}
md_starts( &ctx );
md_update( &ctx, ssl->handshake->randbytes, 64 );
md_update( &ctx, ssl->out_msg + 4, n );
md_finish( &ctx, hash );
SSL_DEBUG_BUF( 3, "my RSA sig", p, rsa_key_len );
p += rsa_key_len;
n += rsa_key_len;
}
#endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) ||
POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
if ( ssl->rsa_key )
rsa_key_len = ssl->rsa_key_len( ssl->rsa_key );
if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
{
ssl->out_msg[4 + n] = ssl->handshake->sig_alg;
ssl->out_msg[5 + n] = SSL_SIG_RSA;
n += 2;
}
ssl->out_msg[4 + n] = (unsigned char)( rsa_key_len >> 8 );
ssl->out_msg[5 + n] = (unsigned char)( rsa_key_len );
if ( ssl->rsa_key )
{
ret = ssl->rsa_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
RSA_PRIVATE,
md_alg, hashlen, hash,
ssl->out_msg + 6 + n );
}
if( ret != 0 )
{
SSL_DEBUG_RET( 1, "pkcs1_sign", ret );
return( ret );
}
SSL_DEBUG_BUF( 3, "my RSA sig", ssl->out_msg + 6 + n, rsa_key_len );
ssl->out_msglen = 6 + n + rsa_key_len;
ssl->out_msglen = 4 + n;
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE;
@ -1364,7 +1418,6 @@ static int ssl_write_server_key_exchange( ssl_context *ssl )
return( 0 );
}
#endif /* POLARSSL_DHM_C || POLARSSL_ECDH_C */
static int ssl_write_server_hello_done( ssl_context *ssl )
{
@ -1389,29 +1442,34 @@ static int ssl_write_server_hello_done( ssl_context *ssl )
return( 0 );
}
static int ssl_parse_client_dh_public( ssl_context *ssl )
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
static int ssl_parse_client_dh_public( ssl_context *ssl, unsigned char **p,
const unsigned char *end )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
#if !defined(POLARSSL_DHM_C)
((void) ssl);
#else
size_t n;
/*
* Receive G^Y mod P, premaster = (G^Y)^X mod P
*/
n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
if( *p + 2 > end )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
if( n < 1 || n > ssl->handshake->dhm_ctx.len ||
n + 6 != ssl->in_hslen )
n = ( (*p)[0] << 8 ) | (*p)[1];
*p += 2;
if( n < 1 || n > ssl->handshake->dhm_ctx.len || *p + n > end )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
if( ( ret = dhm_read_public( &ssl->handshake->dhm_ctx,
ssl->in_msg + 6, n ) ) != 0 )
*p, n ) ) != 0 )
{
SSL_DEBUG_RET( 1, "dhm_read_public", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
@ -1419,29 +1477,15 @@ static int ssl_parse_client_dh_public( ssl_context *ssl )
SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len;
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
ssl->handshake->premaster,
&ssl->handshake->pmslen ) ) != 0 )
{
SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
}
SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
#endif /* POLARSSL_DHM_C */
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
static int ssl_parse_client_ecdh_public( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
#if !defined(POLARSSL_ECDH_C)
((void) ssl);
#else
size_t n;
/*
@ -1465,28 +1509,14 @@ static int ssl_parse_client_ecdh_public( ssl_context *ssl )
SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp );
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
&ssl->handshake->pmslen,
ssl->handshake->premaster,
POLARSSL_MPI_MAX_SIZE ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
}
SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z );
#endif /* POLARSSL_ECDH_C */
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
#if !defined(POLARSSL_RSA_C)
((void) ssl);
#else
size_t i, n = 0;
if( ssl->rsa_key == NULL )
@ -1547,20 +1577,18 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
if( ret != 0 )
return( ret );
}
#endif /* POLARSSL_RSA_C */
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */
static int ssl_parse_client_psk_identity( ssl_context *ssl )
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
static int ssl_parse_client_psk_identity( ssl_context *ssl, unsigned char **p,
const unsigned char *end )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
#if !defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
((void) ssl);
#else
size_t n;
unsigned char *p = ssl->handshake->premaster;
if( ssl->psk == NULL || ssl->psk_identity == NULL ||
ssl->psk_identity_len == 0 || ssl->psk_len == 0 )
@ -1570,45 +1598,43 @@ static int ssl_parse_client_psk_identity( ssl_context *ssl )
}
/*
* Receive client pre-shared key identiy name
* Receive client pre-shared key identity name
*/
n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
if( *p + 2 > end )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
if( n < 1 || n > 65535 )
n = ( (*p)[0] << 8 ) | (*p)[1];
*p += 2;
if( n < 1 || n > 65535 || *p + n > end )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
if( n != ssl->psk_identity_len ||
memcmp( ssl->psk_identity, ssl->in_msg + 6, n ) != 0 )
memcmp( ssl->psk_identity, *p, n ) != 0 )
{
SSL_DEBUG_BUF( 3, "Unknown PSK identity", ssl->in_msg + 6, n );
SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
*(p++) = (unsigned char)( ssl->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->psk_len );
p += ssl->psk_len;
*(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 + 2 * ssl->psk_len;
*p += n;
ret = 0;
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
static int ssl_parse_client_key_exchange( ssl_context *ssl )
{
int ret;
const ssl_ciphersuite_t *ciphersuite_info;
unsigned char *p, *end;
ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
@ -1632,31 +1658,129 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
}
p = ssl->in_msg + 4;
end = ssl->in_msg + ssl->in_msglen;
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA )
{
if( ( ret = ssl_parse_client_dh_public( ssl ) ) != 0 )
if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
return( ret );
}
ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len;
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
ssl->handshake->premaster,
&ssl->handshake->pmslen ) ) != 0 )
{
SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
}
SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
}
else if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
{
if( ( ret = ssl_parse_client_ecdh_public( ssl ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_ecdh_public" ), ret );
return( ret );
}
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
&ssl->handshake->pmslen,
ssl->handshake->premaster,
POLARSSL_MPI_MAX_SIZE ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
}
SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z );
}
else if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK )
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK )
{
if( ( ret = ssl_parse_client_psk_identity( ssl ) ) != 0 )
if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
return( ret );
}
// Set up the premaster secret
//
p = ssl->handshake->premaster;
*(p++) = (unsigned char)( ssl->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->psk_len );
p += ssl->psk_len;
*(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 + 2 * ssl->psk_len;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
size_t n;
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_dh_public( ssl, &p, end ) ) != 0 )
{
SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
return( ret );
}
// Set up the premaster secret
//
p = ssl->handshake->premaster;
*(p++) = (unsigned char)( ssl->handshake->dhm_ctx.len >> 8 );
*(p++) = (unsigned char)( ssl->handshake->dhm_ctx.len );
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
p, &n ) ) != 0 )
{
SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
}
if( n != ssl->handshake->dhm_ctx.len )
{
SSL_DEBUG_MSG( 1, ( "dhm_calc_secret result smaller than DHM" ) );
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
}
SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
p += ssl->handshake->dhm_ctx.len;
*(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 + ssl->handshake->dhm_ctx.len + ssl->psk_len;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA )
{
if( ( ret = ssl_parse_encrypted_pms_secret( ssl ) ) != 0 )
{
@ -1664,6 +1788,11 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
return( ret );
}
}
else
#endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */
{
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
{
@ -1678,27 +1807,46 @@ static int ssl_parse_client_key_exchange( ssl_context *ssl )
return( 0 );
}
#if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \
!defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
!defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
static int ssl_parse_certificate_verify( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
#if defined(POLARSSL_X509_PARSE_C)
size_t n = 0, n1, n2;
unsigned char hash[48];
md_type_t md_alg = POLARSSL_MD_NONE;
unsigned int hashlen = 0;
#endif /* POLARSSL_X509_PARSE_C */
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK )
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
ssl->state++;
return( 0 );
}
return( ret );
}
#else
static int ssl_parse_certificate_verify( ssl_context *ssl )
{
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
size_t n = 0, n1, n2;
unsigned char hash[48];
md_type_t md_alg = POLARSSL_MD_NONE;
unsigned int hashlen = 0;
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
ssl->state++;
return( 0 );
}
#if defined(POLARSSL_X509_PARSE_C)
if( ssl->session_negotiate->peer_cert == NULL )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
@ -1770,12 +1918,14 @@ static int ssl_parse_certificate_verify( ssl_context *ssl )
SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
return( ret );
}
#endif /* POLARSSL_X509_PARSE_C */
SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
return( ret );
}
#endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED &&
!POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED &&
!POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
/*
* SSL handshake -- server side -- single step