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Remove 'session' input from populate_tranform()

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When using this function to deserialize, it's not a problem to have a session
structure as input as we'll have one around anyway (most probably freshly
deserialised).

However for tests it's convenient to be able to build a transform without
having a session structure around.

Also, removing this structure from parameters makes the function signature
more uniform, the only exception left being the ssl param at the end that's
hard to avoid for now.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-10 10:50:04 +02:00
parent cf31216ace
commit 84ef8bde68
1 changed files with 37 additions and 14 deletions
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51
library/ssl_tls.c
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@ -620,7 +620,11 @@ typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *,
* - [in/out]: transform: structure to populate
* [in] must be just initialised with mbedtls_ssl_transform_init()
* [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf()
* - [in] session: used: ciphersuite, encrypt_then_mac, master, compression
* - [in] ciphersuite
* - [in] master
* - [in] encrypt_then_mac
* - [in] trunc_hmac
* - [in] compression
* - [in] tls_prf: pointer to PRF to use for key derivation
* - [in] randbytes: buffer holding ServerHello.random + ClientHello.random
* - [in] minor_ver: SSL/TLS minor version
@ -631,7 +635,17 @@ typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *,
* - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg
*/
static int ssl_populate_transform( mbedtls_ssl_transform *transform,
const mbedtls_ssl_session *session,
int ciphersuite,
const unsigned char master[48],
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
int encrypt_then_mac,
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
int trunc_hmac,
#endif
#if defined(MBEDTLS_ZLIB_SUPPORT)
int compression,
#endif
ssl_tls_prf_t tls_prf,
const unsigned char randbytes[64],
int minor_ver,
@ -660,18 +674,18 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
/* Copy info about negotiated version and extensions */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
transform->encrypt_then_mac = session->encrypt_then_mac;
transform->encrypt_then_mac = encrypt_then_mac;
#endif
transform->minor_ver = minor_ver;
/*
* Get various info structures
*/
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( session->ciphersuite );
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite );
if( ciphersuite_info == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %d not found",
session->ciphersuite ) );
ciphersuite ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
@ -694,8 +708,7 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
/*
* Compute key block using the PRF
*/
ret = tls_prf( session->master, 48, "key expansion",
randbytes, 64, keyblk, 256 );
ret = tls_prf( master, 48, "key expansion", randbytes, 64, keyblk, 256 );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
@ -703,8 +716,8 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", master, 48 );
MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", randbytes, 64 );
MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
@ -766,7 +779,7 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
* (rfc 6066 page 13 or rfc 2104 section 4),
* so we only need to adjust the length here.
*/
if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
if( trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
{
transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
@ -794,7 +807,7 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
* 2. IV except for SSL3 and TLS 1.0
*/
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
if( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
{
transform->minlen = transform->maclen
+ cipher_info->block_size;
@ -949,7 +962,7 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
if( ssl->conf->f_export_keys != NULL )
{
ssl->conf->f_export_keys( ssl->conf->p_export_keys,
session->master, keyblk,
master, keyblk,
mac_key_len, keylen,
iv_copy_len );
}
@ -1008,7 +1021,7 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
/* Initialize Zlib contexts */
#if defined(MBEDTLS_ZLIB_SUPPORT)
if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
if( compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
@ -1200,7 +1213,17 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
/* Populate transform structure */
ret = ssl_populate_transform( ssl->transform_negotiate,
ssl->session_negotiate,
ssl->session_negotiate->ciphersuite,
ssl->session_negotiate->master,
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl->session_negotiate->encrypt_then_mac,
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl->session_negotiate->trunc_hmac,
#endif
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session_negotiate->compression,
#endif
ssl->handshake->tls_prf,
ssl->handshake->randbytes,
ssl->minor_ver,