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server: Correctly handle extensions

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If the server had an RSA host key, it provided unconditionally SHA2
signatures without consulting the client proposed list of supported host
keys.

This commit implements more fine-grained detection of the extension
to provide the client with valid signatures according to RFC 8332
Section 3.1.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Jakub Jelen
2019-01-07 18:49:58 +01:00
committed by Andreas Schneider
parent ca62632170
commit 27fe60954c
3 changed files with 25 additions and 8 deletions
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src/server.c
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@@ -496,7 +496,7 @@ static void ssh_server_connection_callback(ssh_session session){
* our supported extensions now. This is the first message after
* sending NEWKEYS message and after turning on crypto.
*/
if (session->extensions &&
if (session->extensions & SSH_EXT_NEGOTIATION &&
session->session_state != SSH_SESSION_STATE_AUTHENTICATED) {
ssh_server_send_extensions(session);
}