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/*
Unix SMB/CIFS implementation.
SMB Signing Code
Copyright (C) Jeremy Allison 2003.
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
Copyright (C) Stefan Metzmacher 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/globals.h"
/***********************************************************
Called to validate an incoming packet from the client.
************************************************************/
bool srv_check_sign_mac(struct smbd_server_connection *conn,
const char *inbuf, uint32_t *seqnum)
{
/* Check if it's a non-session message. */
if(CVAL(inbuf,0)) {
return true;
}
*seqnum = smb_signing_next_seqnum(conn->smb1.signing_state, false);
return smb_signing_check_pdu(conn->smb1.signing_state,
(const uint8_t *)inbuf,
*seqnum);
}
/***********************************************************
Called to sign an outgoing packet to the client.
************************************************************/
void srv_calculate_sign_mac(struct smbd_server_connection *conn,
char *outbuf, uint32_t seqnum)
{
/* Check if it's a non-session message. */
if(CVAL(outbuf,0)) {
return;
}
smb_signing_sign_pdu(conn->smb1.signing_state, (uint8_t *)outbuf, seqnum);
}
/***********************************************************
Called to indicate a oneway request
************************************************************/
void srv_cancel_sign_response(struct smbd_server_connection *conn)
{
smb_signing_cancel_reply(conn->smb1.signing_state, true);
}
/***********************************************************
Called by server negprot when signing has been negotiated.
************************************************************/
bool srv_init_signing(struct smbd_server_connection *conn)
{
bool allowed = true;
bool mandatory = false;
switch (lp_server_signing()) {
case Required:
mandatory = true;
break;
case Auto:
break;
case True:
break;
case False:
allowed = false;
break;
}
conn->smb1.signing_state = smb_signing_init(smbd_event_context(),
allowed, mandatory);
if (!conn->smb1.signing_state) {
return false;
}
return true;
}
void srv_set_signing_negotiated(struct smbd_server_connection *conn)
{
smb_signing_set_negotiated(conn->smb1.signing_state);
}
/***********************************************************
Returns whether signing is active. We can't use sendfile or raw
reads/writes if it is.
************************************************************/
bool srv_is_signing_active(struct smbd_server_connection *conn)
{
return smb_signing_is_active(conn->smb1.signing_state);
}
/***********************************************************
Returns whether signing is negotiated. We can't use it unless it was
in the negprot.
************************************************************/
bool srv_is_signing_negotiated(struct smbd_server_connection *conn)
{
return smb_signing_is_negotiated(conn->smb1.signing_state);
}
/***********************************************************
Turn on signing from this packet onwards.
************************************************************/
void srv_set_signing(struct smbd_server_connection *conn,
const DATA_BLOB user_session_key,
const DATA_BLOB response)
{
bool negotiated;
bool mandatory;
if (!user_session_key.length)
return;
negotiated = smb_signing_is_negotiated(conn->smb1.signing_state);
mandatory = smb_signing_is_mandatory(conn->smb1.signing_state);
if (!negotiated && !mandatory) {
DEBUG(5,("srv_set_signing: signing negotiated = %u, "
"mandatory_signing = %u. Not allowing smb signing.\n",
negotiated, mandatory));
return;
}
if (!smb_signing_activate(conn->smb1.signing_state,
user_session_key, response)) {
return;
}
DEBUG(3,("srv_set_signing: turning on SMB signing: "
"signing negotiated = %u, mandatory_signing = %u.\n",
negotiated, mandatory));
}
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