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Use a specific function in the PSK callback

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Manuel Pégourié-Gonnard 2015-05-07 15:59:54 +01:00
parent 0a4fb09534
commit 4b68296626
3 changed files with 89 additions and 20 deletions
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39
include/mbedtls/ssl.h
View file

@ -672,6 +672,10 @@ struct mbedtls_ssl_handshake_params
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
const mbedtls_ecp_curve_info **curves; /*!< Supported elliptic curves */
#endif
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
unsigned char *psk; /*!< PSK from the callback */
size_t psk_len; /*!< Length of PSK from callback */
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
/**
* Current key/cert or key/cert list.
@ -1581,8 +1585,10 @@ int mbedtls_ssl_set_own_cert( mbedtls_ssl_context *ssl, mbedtls_x509_crt *own_ce
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
/**
* \brief Set the Pre Shared Key (PSK) and the identity name connected
* to it.
* \brief Set the Pre Shared Key (PSK) and the expected identity name
*
* \note This is mainly useful for clients. Servers will usually
* want to use \c mbedtls_ssl_set_psk_cb() instead.
*
* \param ssl SSL context
* \param psk pointer to the pre-shared key
@ -1592,11 +1598,28 @@ int mbedtls_ssl_set_own_cert( mbedtls_ssl_context *ssl, mbedtls_x509_crt *own_ce
*
* \return 0 if successful or MBEDTLS_ERR_SSL_MALLOC_FAILED
*/
int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl, const unsigned char *psk, size_t psk_len,
int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len );
/**
* \brief Set the PSK callback (server-side only) (Optional).
* \brief Set the Pre Shared Key (PSK) for the current handshake
*
* \note This should only be called inside the PSK callback,
* ie the function passed to \c mbedtls_ssl_set_psk_cb().
*
* \param ssl SSL context
* \param psk pointer to the pre-shared key
* \param psk_len pre-shared key length
*
* \return 0 if successful or MBEDTLS_ERR_SSL_MALLOC_FAILED
*/
int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len );
/**
* \brief Set the PSK callback (server-side only).
*
* If set, the PSK callback is called for each
* handshake where a PSK ciphersuite was negotiated.
@ -1607,10 +1630,14 @@ int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl, const unsigned char *psk, siz
* mbedtls_ssl_context *ssl, const unsigned char *psk_identity,
* size_t identity_len)
* If a valid PSK identity is found, the callback should use
* mbedtls_ssl_set_psk() on the ssl context to set the correct PSK and
* identity and return 0.
* \c mbedtls_ssl_set_hs_psk() on the ssl context to set the
* correct PSK and return 0.
* Any other return value will result in a denied PSK identity.
*
* \note If you set a PSK callback using this function, then you
* don't need to set a PSK key and identity using
* \c mbedtls_ssl_set_psk().
*
* \param conf SSL configuration
* \param f_psk PSK identity function
* \param p_psk PSK identity parameter

63
library/ssl_tls.c
View file

@ -1066,6 +1066,15 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
{
unsigned char *p = ssl->handshake->premaster;
unsigned char *end = p + sizeof( ssl->handshake->premaster );
const unsigned char *psk = ssl->conf->psk;
size_t psk_len = ssl->conf->psk_len;
/* If the psk callback was called, use its result */
if( ssl->handshake->psk != NULL )
{
psk = ssl->handshake->psk;
psk_len = ssl->handshake->psk_len;
}
/*
* PMS = struct {
@ -1077,12 +1086,12 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
{
if( end - p < 2 + (int) ssl->conf->psk_len )
if( end - p < 2 + (int) psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
*(p++) = (unsigned char)( ssl->conf->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->conf->psk_len );
p += ssl->conf->psk_len;
*(p++) = (unsigned char)( psk_len >> 8 );
*(p++) = (unsigned char)( psk_len );
p += psk_len;
}
else
#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
@ -1149,13 +1158,13 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
}
/* opaque psk<0..2^16-1>; */
if( end - p < 2 + (int) ssl->conf->psk_len )
if( end - p < 2 + (int) psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
*(p++) = (unsigned char)( ssl->conf->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->conf->psk_len );
memcpy( p, ssl->conf->psk, ssl->conf->psk_len );
p += ssl->conf->psk_len;
*(p++) = (unsigned char)( psk_len >> 8 );
*(p++) = (unsigned char)( psk_len );
memcpy( p, psk, psk_len );
p += psk_len;
ssl->handshake->pmslen = p - ssl->handshake->premaster;
@ -5353,7 +5362,8 @@ int mbedtls_ssl_set_own_cert( mbedtls_ssl_context *ssl, mbedtls_x509_crt *own_ce
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl, const unsigned char *psk, size_t psk_len,
int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len )
{
if( psk == NULL || psk_identity == NULL )
@ -5385,6 +5395,31 @@ int mbedtls_ssl_set_psk( mbedtls_ssl_context *ssl, const unsigned char *psk, siz
return( 0 );
}
int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len )
{
if( psk == NULL || ssl->handshake == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( psk_len > MBEDTLS_PSK_MAX_LEN )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ssl->handshake->psk != NULL )
mbedtls_free( ssl->conf->psk );
if( ( ssl->handshake->psk = mbedtls_malloc( psk_len ) ) == NULL )
{
mbedtls_free( ssl->handshake->psk );
ssl->handshake->psk = NULL;
return( MBEDTLS_ERR_SSL_MALLOC_FAILED );
}
ssl->handshake->psk_len = psk_len;
memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
return( 0 );
}
void mbedtls_ssl_set_psk_cb( mbedtls_ssl_config *conf,
int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
size_t),
@ -6441,6 +6476,14 @@ void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
mbedtls_free( (void *) handshake->curves );
#endif
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
if( handshake->psk != NULL )
{
mbedtls_zeroize( handshake->psk, handshake->psk_len );
mbedtls_free( handshake->psk );
}
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
/*

3
programs/ssl/ssl_server2.c
View file

@ -678,8 +678,7 @@ int psk_callback( void *p_info, mbedtls_ssl_context *ssl,
if( name_len == strlen( cur->name ) &&
memcmp( name, cur->name, name_len ) == 0 )
{
return( mbedtls_ssl_set_psk( ssl, cur->key, cur->key_len,
name, name_len ) );
return( mbedtls_ssl_set_hs_psk( ssl, cur->key, cur->key_len ) );
}
cur = cur->next;