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Read max_fragment_length extension (client)

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-07-17 10:14:38 +02:00
parent a052849640
commit de600e571a
1 changed files with 28 additions and 0 deletions
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28
library/ssl_cli.c
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@ -526,6 +526,23 @@ static int ssl_parse_renegotiation_info( ssl_context *ssl,
return( 0 ); return( 0 );
} }
static int ssl_parse_max_fragment_length_ext( ssl_context *ssl,
unsigned char *buf,
size_t len )
{
/*
* server should use the extension only if we did,
* and if so the server's value should match ours (and len is always 1)
*/
if( ssl->mfl_code == SSL_MAX_FRAG_LEN_NONE ||
len != 1 ||
buf[0] != ssl->mfl_code )
{
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
}
return( 0 );
}
static int ssl_parse_server_hello( ssl_context *ssl ) static int ssl_parse_server_hello( ssl_context *ssl )
{ {
@ -743,6 +760,17 @@ static int ssl_parse_server_hello( ssl_context *ssl )
break; break;
case TLS_EXT_MAX_FRAGMENT_LENGTH:
SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) );
if( ( ret = ssl_parse_max_fragment_length_ext( ssl,
ext + 4, ext_size ) ) != 0 )
{
return( ret );
}
break;
default: default:
SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)", SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
ext_id ) ); ext_id ) );