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TLS: Parse ServerHello extensions

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This prints the received ServerHello extensions into the debug log and
allows handshake to continue even if such extensions are included.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-12-13 22:45:35 +02:00
parent 16c43d2a8f
commit 4303d531a8
1 changed files with 55 additions and 2 deletions
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57
src/tls/tlsv1_client_read.c
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@ -1,6 +1,6 @@
/*
* TLSv1 client - read handshake message
* Copyright (c) 2006-2014, Jouni Malinen <j@w1.fi>
* Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -38,6 +38,43 @@ static int tls_version_disabled(struct tlsv1_client *conn, u16 ver)
}
static int tls_process_server_hello_extensions(struct tlsv1_client *conn,
const u8 *pos, size_t len)
{
const u8 *end = pos + len;
wpa_hexdump(MSG_MSGDUMP, "TLSv1: ServerHello extensions",
pos, len);
while (pos < end) {
u16 ext, elen;
if (end - pos < 4) {
wpa_printf(MSG_INFO, "TLSv1: Truncated ServerHello extension header");
return -1;
}
ext = WPA_GET_BE16(pos);
pos += 2;
elen = WPA_GET_BE16(pos);
pos += 2;
if (elen > end - pos) {
wpa_printf(MSG_INFO, "TLSv1: Truncated ServerHello extension");
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: ServerHello ExtensionType %u",
ext);
wpa_hexdump(MSG_DEBUG, "TLSv1: ServerHello extension data",
pos, elen);
pos += elen;
}
return 0;
}
static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
@ -177,8 +214,24 @@ static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct,
}
pos++;
if (end - pos >= 2) {
u16 ext_len;
ext_len = WPA_GET_BE16(pos);
pos += 2;
if (end - pos < ext_len) {
wpa_printf(MSG_INFO,
"TLSv1: Invalid ServerHello extension length: %u (left: %u)",
ext_len, (unsigned int) (end - pos));
goto decode_error;
}
if (tls_process_server_hello_extensions(conn, pos, ext_len))
goto decode_error;
pos += ext_len;
}
if (end != pos) {
/* TODO: ServerHello extensions */
wpa_hexdump(MSG_DEBUG, "TLSv1: Unexpected extra data in the "
"end of ServerHello", pos, end - pos);
goto decode_error;