negprot.c

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/* 
   Unix SMB/CIFS implementation.
   negprot reply code
   Copyright (C) Andrew Tridgell 1992-1998
   
   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 "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/auth.h"
#include "smb_server/smb_server.h"
#include "libcli/smb2/smb2.h"
#include "smb_server/smb2/smb2_server.h"
#include "smb_server/service_smb_proto.h"
#include "smbd/service_stream.h"
#include "lib/stream/packet.h"
#include "param/param.h"


/* initialise the auth_context for this server and return the cryptkey */
static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8]) 
{
	NTSTATUS nt_status;
	const uint8_t *challenge;

	/* muliple negprots are not premitted */
	if (smb_conn->negotiate.auth_context) {
		DEBUG(3,("get challenge: is this a secondary negprot?  auth_context is non-NULL!\n"));
		return NT_STATUS_FOOBAR;
	}

	DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));

	nt_status = auth_context_create(smb_conn, 
					smb_conn->connection->event.ctx,
					smb_conn->connection->msg_ctx,
					smb_conn->lp_ctx,
					&smb_conn->negotiate.auth_context);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status)));
		return nt_status;
	}

	nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status)));
		return nt_status;
	}

	memcpy(buff, challenge, 8);

	return NT_STATUS_OK;
}

/****************************************************************************
 Reply for the core protocol.
****************************************************************************/
static void reply_corep(struct smbsrv_request *req, uint16_t choice)
{
	smbsrv_setup_reply(req, 1, 0);

	SSVAL(req->out.vwv, VWV(0), choice);

	req->smb_conn->negotiate.protocol = PROTOCOL_CORE;

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "CORE does not support SMB signing, and it is mandatory\n");
		return;
	}

	smbsrv_send_reply(req);
}

/****************************************************************************
 Reply for the coreplus protocol.
this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
this any more it probably doesn't matter
****************************************************************************/
static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
{
	uint16_t raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);

	smbsrv_setup_reply(req, 13, 0);

	/* Reply, SMBlockread, SMBwritelock supported. */
	SCVAL(req->out.hdr,HDR_FLG,
	      CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */	

	/* tell redirector we support
	   readbraw and writebraw (possibly) */
	SSVAL(req->out.vwv, VWV(5), raw); 

	req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "COREPLUS does not support SMB signing, and it is mandatory\n");
		return;
	}

	smbsrv_send_reply(req);
}

/****************************************************************************
 Reply for the lanman 1.0 protocol.
****************************************************************************/
static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
{
	int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
	int secword=0;
	time_t t = req->request_time.tv_sec;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);

	if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;

	if (req->smb_conn->negotiate.encrypted_passwords)
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;

	req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;

	smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);

	/* SMBlockread, SMBwritelock supported. */
	SCVAL(req->out.hdr,HDR_FLG,
	      CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), secword); 
	SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
	SSVAL(req->out.vwv, VWV(3), lp_maxmux(req->smb_conn->lp_ctx));
	SSVAL(req->out.vwv, VWV(4), 1);
	SSVAL(req->out.vwv, VWV(5), raw); 
	SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
	srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
	SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
	SIVAL(req->out.vwv, VWV(11), 0); /* reserved */

	/* Create a token value and add it to the outgoing packet. */
	if (req->smb_conn->negotiate.encrypted_passwords) {
		NTSTATUS nt_status;

		SSVAL(req->out.vwv, VWV(11), 8);

		nt_status = get_challenge(req->smb_conn, req->out.data);
		if (!NT_STATUS_IS_OK(nt_status)) {
			smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
			return;
		}
	}

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "LANMAN1 does not support SMB signing, and it is mandatory\n");
		return;
	}

	smbsrv_send_reply(req);	
}

/****************************************************************************
 Reply for the lanman 2.0 protocol.
****************************************************************************/
static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
{
	int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
	int secword=0;
	time_t t = req->request_time.tv_sec;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
  
	if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;

	if (req->smb_conn->negotiate.encrypted_passwords)
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;

	req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;

	smbsrv_setup_reply(req, 13, 0);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), secword); 
	SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
	SSVAL(req->out.vwv, VWV(3), lp_maxmux(req->smb_conn->lp_ctx));
	SSVAL(req->out.vwv, VWV(4), 1);
	SSVAL(req->out.vwv, VWV(5), raw); 
	SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
	srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
	SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
	SIVAL(req->out.vwv, VWV(11), 0);

	/* Create a token value and add it to the outgoing packet. */
	if (req->smb_conn->negotiate.encrypted_passwords) {
		SSVAL(req->out.vwv, VWV(11), 8);
		req_grow_data(req, 8);
		get_challenge(req->smb_conn, req->out.data);
	}

	req_push_str(req, NULL, lp_workgroup(req->smb_conn->lp_ctx), -1, STR_TERMINATE);

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "LANMAN2 does not support SMB signing, and it is mandatory\n");
		return;
	}

	smbsrv_send_reply(req);
}

static void reply_nt1_orig(struct smbsrv_request *req)
{
	/* Create a token value and add it to the outgoing packet. */
	if (req->smb_conn->negotiate.encrypted_passwords) {
		req_grow_data(req, 8);
		/* note that we do not send a challenge at all if
		   we are using plaintext */
		get_challenge(req->smb_conn, req->out.ptr);
		req->out.ptr += 8;
		SCVAL(req->out.vwv+1, VWV(16), 8);
	}
	req_push_str(req, NULL, lp_workgroup(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
	req_push_str(req, NULL, lp_netbios_name(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
	DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
}

/****************************************************************************
 Reply for the nt protocol.
****************************************************************************/
static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
{
	/* dual names + lock_and_read + nt SMBs + remote API calls */
	int capabilities;
	int secword=0;
	time_t t = req->request_time.tv_sec;
	NTTIME nttime;
	bool negotiate_spnego = false;
	char *large_test_path;

	unix_to_nt_time(&nttime, t);

	capabilities = 
		CAP_NT_FIND | CAP_LOCK_AND_READ | 
		CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);

	/* do spnego in user level security if the client
	   supports it and we can do encrypted passwords */
	
	if (req->smb_conn->negotiate.encrypted_passwords && 
	    (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE) &&
	    lp_use_spnego(req->smb_conn->lp_ctx) &&