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Update based on comments

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Remove cookie support from server side
Change code to align with coding styles
Re-order functions of client_hello

Change-Id: If31509ece402f8276e6cac37f261e0b166d05e18
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
This commit is contained in:
XiaokangQian
2022-04-13 08:21:05 +00:00
parent 4080a7f687
commit ed582dd023
4 changed files with 97 additions and 208 deletions
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272
library/ssl_tls13_server.c
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@ -307,121 +307,6 @@ static int ssl_tls13_parse_key_shares_ext( mbedtls_ssl_context *ssl,
}
#endif /* MBEDTLS_ECDH_C */
#if defined(MBEDTLS_SSL_COOKIE_C)
static int ssl_tls13_parse_cookie_ext( mbedtls_ssl_context *ssl,
const unsigned char *buf,
const unsigned char *end )
{
int ret = 0;
size_t cookie_len;
unsigned char const *p = buf;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse cookie extension" ) );
if( ssl->conf->f_cookie_check != NULL )
{
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
cookie_len = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, cookie_len );
MBEDTLS_SSL_DEBUG_BUF( 3, "Received cookie", p, cookie_len );
if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
p, cookie_len, ssl->cli_id,
ssl->cli_id_len ) != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
ret = MBEDTLS_ERR_SSL_HRR_REQUIRED;
}
else
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
}
}
else
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
}
return( ret );
}
#endif /* MBEDTLS_SSL_COOKIE_C */
/*
*
* STATE HANDLING: ClientHello
*
* There are three possible classes of outcomes when parsing the CH:
*
* 1) The CH was well-formed and matched the server's configuration.
*
* In this case, the server progresses to sending its ServerHello.
*
* 2) The CH was well-formed but didn't match the server's configuration.
*
* For example, the client might not have offered a key share which
* the server supports, or the server might require a cookie.
*
* In this case, the server sends a HelloRetryRequest.
*
* 3) The CH was ill-formed
*
* In this case, we abort the handshake.
*
*/
/*
* Overview
*/
/* Main entry point from the state machine; orchestrates the otherfunctions. */
static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl );
static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
const unsigned char *buf,
const unsigned char *end );
/* Update the handshake state machine */
static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context *ssl,
int hrr_required );
/*
* Implementation
*/
#define SSL_CLIENT_HELLO_OK 0
#define SSL_CLIENT_HELLO_HRR_REQUIRED 1
static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl )
{
int ret = 0;
int hrr_required = SSL_CLIENT_HELLO_OK;
unsigned char* buf = NULL;
size_t buflen = 0;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg(
ssl, MBEDTLS_SSL_HS_CLIENT_HELLO,
&buf, &buflen ) );
MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_parse_client_hello( ssl, buf,
buf + buflen ) );
hrr_required = ret;
MBEDTLS_SSL_DEBUG_MSG( 1, ( "postprocess" ) );
MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_client_hello( ssl,
hrr_required ) );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
return( ret );
}
static void ssl_tls13_debug_print_client_hello_exts( mbedtls_ssl_context *ssl )
{
((void) ssl);
@ -450,11 +335,6 @@ static void ssl_tls13_debug_print_client_hello_exts( mbedtls_ssl_context *ssl )
( ( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_SERVERNAME ) > 0 ) ?
"TRUE" : "FALSE" ) );
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined ( MBEDTLS_SSL_COOKIE_C )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "- COOKIE_EXTENSION ( %s )",
( ( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_COOKIE ) >0 ) ?
"TRUE" : "FALSE" ) );
#endif /* MBEDTLS_SSL_COOKIE_C */
}
static int ssl_tls13_client_hello_has_exts( mbedtls_ssl_context *ssl,
@ -484,6 +364,29 @@ static int ssl_tls13_check_certificate_key_exchange( mbedtls_ssl_context *ssl )
return( 1 );
}
/*
*
* STATE HANDLING: ClientHello
*
* There are three possible classes of outcomes when parsing the CH:
*
* 1) The CH was well-formed and matched the server's configuration.
*
* In this case, the server progresses to sending its ServerHello.
*
* 2) The CH was well-formed but didn't match the server's configuration.
*
* For example, the client might not have offered a key share which
* the server supports, or the server might require a cookie.
*
* In this case, the server sends a HelloRetryRequest.
*
* 3) The CH was ill-formed
*
* In this case, we abort the handshake.
*
*/
/*
* Structure of this message:
*
@ -501,6 +404,10 @@ static int ssl_tls13_check_certificate_key_exchange( mbedtls_ssl_context *ssl )
* Extension extensions<8..2^16-1>;
* } ClientHello;
*/
#define SSL_CLIENT_HELLO_OK 0
#define SSL_CLIENT_HELLO_HRR_REQUIRED 1
static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
const unsigned char *buf,
const unsigned char *end )
@ -510,11 +417,11 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
size_t legacy_session_id_len;
size_t cipher_suites_len;
size_t extensions_len;
const unsigned char *ciph_offset;
const unsigned char *cipher_suites_start;
const unsigned char *p = buf;
const unsigned char *extensions_end;
const int* ciphersuites;
const int* cipher_suites;
const mbedtls_ssl_ciphersuite_t* ciphersuite_info;
int hrr_required = 0;
@ -568,7 +475,6 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
p, MBEDTLS_SERVER_HELLO_RANDOM_LEN );
memcpy( &ssl->handshake->randbytes[0], p, MBEDTLS_SERVER_HELLO_RANDOM_LEN );
/* skip random bytes */
p += MBEDTLS_SERVER_HELLO_RANDOM_LEN;
/*
@ -592,10 +498,10 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
* it sent in the ClientHello MUST abort the handshake with an
* "illegal_parameter" alert.
*/
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id length ( %" MBEDTLS_PRINTF_SIZET " )", legacy_session_id_len ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf, legacy_session_id_len );
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
buf, legacy_session_id_len );
memcpy( &ssl->session_negotiate->id[0], p, legacy_session_id_len ); /* write session id */
memcpy( &ssl->session_negotiate->id[0], p, legacy_session_id_len );
p += legacy_session_id_len;
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
@ -605,12 +511,12 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, cipher_suites_len );
/* store pointer to ciphersuite list */
ciph_offset = p;
cipher_suites_start = p;
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
p, cipher_suites_len );
/* skip ciphersuites for now */
/* skip cipher_suites for now */
p += cipher_suites_len;
/* ...
@ -628,10 +534,9 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
p++;
/*
* Check the extension length
* Check the extensions length
*/
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
extensions_len = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
extensions_end = p + extensions_len;
@ -655,27 +560,6 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
switch( extension_type )
{
#if defined(MBEDTLS_SSL_COOKIE_C)
case MBEDTLS_TLS_EXT_COOKIE:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found cookie extension" ) );
ret = ssl_tls13_parse_cookie_ext( ssl, p,
extension_data_end );
/* if cookie verification failed then we return a hello retry
* message, or return success and set cookie extension present
*/
if( ret == MBEDTLS_ERR_SSL_HRR_REQUIRED )
{
hrr_required = 1;
}
else if( ret == 0 )
{
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_COOKIE;
}
break;
#endif /* MBEDTLS_SSL_COOKIE_C */
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported group extension" ) );
@ -713,8 +597,8 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
ret = ssl_tls13_parse_key_shares_ext( ssl, p, extension_data_end );
if( ret == MBEDTLS_ERR_SSL_HRR_REQUIRED )
{
hrr_required = 1;
ret = 0;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "HRR needed " ) );
ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
if( ret != 0 )
@ -773,18 +657,17 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
/*
* Search for a matching ciphersuite
*/
ciphersuites = ssl->conf->ciphersuite_list;
cipher_suites = ssl->conf->ciphersuite_list;
ciphersuite_info = NULL;
for ( j = 0, p = ciph_offset; j < cipher_suites_len; j += 2, p += 2 )
for ( j = 0, p = cipher_suites_start; j < cipher_suites_len; j += 2, p += 2 )
{
for ( i = 0; ciphersuites[i] != 0; i++ )
for ( i = 0; cipher_suites[i] != 0; i++ )
{
if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
if( MBEDTLS_GET_UINT16_BE(p, 0) != cipher_suites[i] )
continue;
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(
ciphersuites[i] );
cipher_suites[i] );
if( ciphersuite_info == NULL )
{
@ -806,7 +689,7 @@ have_ciphersuite:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s",
ciphersuite_info->name ) );
ssl->session_negotiate->ciphersuite = ciphersuites[i];
ssl->session_negotiate->ciphersuite = cipher_suites[i];
ssl->handshake->ciphersuite_info = ciphersuite_info;
/* List all the extensions we have received */
@ -837,35 +720,20 @@ have_ciphersuite:
return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
}
#if defined(MBEDTLS_SSL_COOKIE_C)
/* If we failed to see a cookie extension, and we required it through the
* configuration settings ( rr_config ), then we need to send a HRR msg.
* Conceptually, this is similiar to having received a cookie that failed
* the verification check.
*/
if( ( ssl->conf->rr_config == MBEDTLS_SSL_FORCE_RR_CHECK_ON ) &&
!( ssl->handshake->extensions_present & MBEDTLS_SSL_EXT_COOKIE ) )
{
MBEDTLS_SSL_DEBUG_MSG(
2,
( "Cookie extension missing. Need to send a HRR." ) );
hrr_required = 1;
}
#endif /* MBEDTLS_SSL_COOKIE_C */
if( hrr_required == 1 )
return( SSL_CLIENT_HELLO_HRR_REQUIRED );
return( 0 );
}
/* Update the handshake state machine */
static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context* ssl,
int hrr_required )
{
int ret = 0;
if( ssl->handshake->hello_retry_requests_sent == 0 &&
ssl->conf->rr_config == MBEDTLS_SSL_FORCE_RR_CHECK_ON )
if( ssl->handshake->hello_retry_requests_sent == 0 )
{
hrr_required = SSL_CLIENT_HELLO_HRR_REQUIRED;
}
@ -903,6 +771,38 @@ static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context* ssl,
}
/*
* Main entry point from the state machine; orchestrates the otherfunctions.
*/
static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl )
{
int ret = 0;
int hrr_required = SSL_CLIENT_HELLO_OK;
unsigned char* buf = NULL;
size_t buflen = 0;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg(
ssl, MBEDTLS_SSL_HS_CLIENT_HELLO,
&buf, &buflen ) );
MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_parse_client_hello( ssl, buf,
buf + buflen ) );
hrr_required = ret;
MBEDTLS_SSL_DEBUG_MSG( 1, ( "postprocess" ) );
MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_client_hello( ssl,
hrr_required ) );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
return( ret );
}
/*
* TLS and DTLS 1.3 State Maschine -- server side
*/
@ -917,9 +817,6 @@ int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl )
mbedtls_ssl_states_str( ssl->state ),
ssl->state ) );
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
return( ret );
switch( ssl->state )
{
/* start state */
@ -939,19 +836,6 @@ int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl )
break;
case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to application keys for all traffic" ) );
mbedtls_ssl_set_inbound_transform ( ssl, ssl->transform_application );
mbedtls_ssl_set_outbound_transform( ssl, ssl->transform_application );
mbedtls_ssl_tls13_handshake_wrapup( ssl );
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET );
break;
default:
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );