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Add ssl_conf_dhm_min_bitlen()

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-06-11 14:49:42 +02:00
parent bf27eaac79
commit bd990d6629
3 changed files with 36 additions and 3 deletions
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17
include/mbedtls/ssl.h
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@ -577,6 +577,10 @@ struct mbedtls_ssl_config
unsigned int badmac_limit; /*!< limit of records with a bad MAC */ unsigned int badmac_limit; /*!< limit of records with a bad MAC */
#endif #endif
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
unsigned int dhm_min_bitlen; /*!< min. bit length of the DHM prime */
#endif
unsigned char max_major_ver; /*!< max. major version used */ unsigned char max_major_ver; /*!< max. major version used */
unsigned char max_minor_ver; /*!< max. minor version used */ unsigned char max_minor_ver; /*!< max. minor version used */
unsigned char min_major_ver; /*!< min. major version used */ unsigned char min_major_ver; /*!< min. major version used */
@ -1477,6 +1481,19 @@ int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, cons
int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx ); int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx );
#endif /* MBEDTLS_DHM_C && defined(MBEDTLS_SSL_SRV_C) */ #endif /* MBEDTLS_DHM_C && defined(MBEDTLS_SSL_SRV_C) */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
/**
* \brief Set the minimum length for Diffie-Hellman parameters.
* (Client-side only.)
* (Default: 1024 bits.)
*
* \param conf SSL configuration
* \param bitlen Minimum bit length of the DHM prime
*/
void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
unsigned int bitlen );
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_SSL_SET_CURVES) #if defined(MBEDTLS_SSL_SET_CURVES)
/** /**
* \brief Set the allowed curves in order of preference. * \brief Set the allowed curves in order of preference.

7
library/ssl_cli.c
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@ -1648,10 +1648,11 @@ static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char *
return( ret ); return( ret );
} }
if( ssl->handshake->dhm_ctx.len < 64 || if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen )
ssl->handshake->dhm_ctx.len > 512 )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (DHM length)" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d",
ssl->handshake->dhm_ctx.len * 8,
ssl->conf->dhm_min_bitlen ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
} }

15
library/ssl_tls.c
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@ -5458,6 +5458,17 @@ int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context
} }
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
/*
* Set the minimum length for Diffie-Hellman parameters
*/
void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
unsigned int bitlen )
{
conf->dhm_min_bitlen = bitlen;
}
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_SSL_SET_CURVES) #if defined(MBEDTLS_SSL_SET_CURVES)
/* /*
* Set the allowed elliptic curves * Set the allowed elliptic curves
@ -6665,6 +6676,10 @@ int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
conf->renego_period[7] = 0x00; conf->renego_period[7] = 0x00;
#endif #endif
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
conf->dhm_min_bitlen = 1024;
#endif
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
if( endpoint == MBEDTLS_SSL_IS_SERVER ) if( endpoint == MBEDTLS_SSL_IS_SERVER )
{ {