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More SSL debug messages for ClientHello parsing

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In particular, be verbose when checking the ClientHello cookie in a possible
DTLS reconnection.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-02-15 23:53:36 +01:00 • committed by Andrzej Kurek
parent a745c7d439
commit 364fd8bb71
2 changed files with 52 additions and 20 deletions
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10
library/ssl_tls12_server.c
View file

@ -1286,7 +1286,10 @@ read_record_header:
if( buf[1] != 0 ||
msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message: %u != %u + %u",
(unsigned) msg_len,
(unsigned) mbedtls_ssl_hs_hdr_len( ssl ),
(unsigned) ( buf[2] << 8 ) | buf[3] ) );
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
}
@ -1327,6 +1330,11 @@ read_record_header:
* For now we don't support fragmentation, so make sure
* fragment_offset == 0 and fragment_length == length
*/
MBEDTLS_SSL_DEBUG_MSG(
4, ( "fragment_offset=%u fragment_length=%u length=%u",
(unsigned) ( ssl->in_msg[6] << 16 | ssl->in_msg[7] << 8 | ssl->in_msg[8] ),
(unsigned) ( ssl->in_msg[9] << 16 | ssl->in_msg[10] << 8 | ssl->in_msg[11] ),
(unsigned) ( ssl->in_msg[1] << 16 | ssl->in_msg[2] << 8 | ssl->in_msg[3] ) ) );
if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
{