/* 
   Samba Unix/Linux SMB client library 
   Distributed SMB/CIFS Server Management Utility 
   Copyright (C) 2001 Andrew Bartlett (abartlet@samba.org)
   Copyright (C) Tim Potter     2001

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
#include "includes.h"
#include "utils/net.h"

/* Macro for checking RPC error codes to make things more readable */

#define CHECK_RPC_ERR(rpc, msg) \
        if (!NT_STATUS_IS_OK(result = rpc)) { \
                DEBUG(0, (msg ": %s\n", nt_errstr(result))); \
                goto done; \
        }

#define CHECK_RPC_ERR_DEBUG(rpc, debug_args) \
        if (!NT_STATUS_IS_OK(result = rpc)) { \
                DEBUG(0, debug_args); \
                goto done; \
        }


/**
 * confirm that a domain join is still valid
 *
 * @return A shell status integer (0 for success)
 *
 **/
static int net_rpc_join_ok(const char *domain)
{
	struct cli_state *cli;
	uchar stored_md4_trust_password[16];
	int retval = 1;
	uint32 channel;
	NTSTATUS result;

	/* Connect to remote machine */
	if (!(cli = net_make_ipc_connection(NET_FLAGS_ANONYMOUS | NET_FLAGS_PDC))) {
		return 1;
	}

	if (!cli_nt_session_open(cli, PI_NETLOGON)) {
		DEBUG(0,("Error connecting to NETLOGON pipe\n"));
		goto done;
	}

	if (!secrets_fetch_trust_account_password(domain,
						  stored_md4_trust_password, 
						  NULL, &channel)) {
		DEBUG(0,("Could not retreive domain trust secret"));
		goto done;
	}
	
	/* ensure that schannel uses the right domain */
	fstrcpy(cli->domain, domain);
	if (! NT_STATUS_IS_OK(result = cli_nt_establish_netlogon(cli, channel, stored_md4_trust_password))) {
		DEBUG(0,("Error in domain join verfication (fresh connection)\n"));
		goto done;
	}
	
	retval = 0;		/* Success! */
	
done:
	/* Close down pipe - this will clean up open policy handles */
	if (cli->nt_pipe_fnum[cli->pipe_idx])
		cli_nt_session_close(cli);

	cli_shutdown(cli);

	return retval;
}

/**
 * Join a domain using the administrator username and password
 *
 * @param argc  Standard main() style argc
 * @param argc  Standard main() style argv.  Initial components are already
 *              stripped.  Currently not used.
 * @return A shell status integer (0 for success)
 *
 **/

int net_rpc_join_newstyle(int argc, const char **argv) 
{

	/* libsmb variables */

	struct cli_state *cli;
	TALLOC_CTX *mem_ctx;
        uint32 acb_info = ACB_WSTRUST;
	uint32 sec_channel_type;

	/* rpc variables */

	POLICY_HND lsa_pol, sam_pol, domain_pol, user_pol;
	DOM_SID *domain_sid;
	uint32 user_rid;

	/* Password stuff */

	char *clear_trust_password = NULL;
	uchar pwbuf[516];
	SAM_USERINFO_CTR ctr;
	SAM_USER_INFO_24 p24;
	SAM_USER_INFO_10 p10;
	uchar md4_trust_password[16];

	/* Misc */

	NTSTATUS result;
	int retval = 1;
	char *domain;
	uint32 num_rids, *name_types, *user_rids;
	uint32 flags = 0x3e8;
	char *acct_name;
	const char *const_acct_name;

	/* check what type of join */
	if (argc >= 0) {
		sec_channel_type = get_sec_channel_type(argv[0]);
	} else {
		sec_channel_type = get_sec_channel_type(NULL);
	}

	switch (sec_channel_type) {
	case SEC_CHAN_WKSTA:
		acb_info = ACB_WSTRUST;
		break;
	case SEC_CHAN_BDC:
		acb_info = ACB_SVRTRUST;
		break;
#if 0
	case SEC_CHAN_DOMAIN:
		acb_info = ACB_DOMTRUST;
		break;
#endif
	}

	/* Connect to remote machine */

	if (!(cli = net_make_ipc_connection(NET_FLAGS_PDC))) 
		return 1;

	if (!(mem_ctx = talloc_init("net_rpc_join_newstyle"))) {
		DEBUG(0, ("Could not initialise talloc context\n"));
		goto done;
	}

	/* Fetch domain sid */

	if (!cli_nt_session_open(cli, PI_LSARPC)) {
		DEBUG(0, ("Error connecting to LSA pipe\n"));
		goto done;
	}


	CHECK_RPC_ERR(cli_lsa_open_policy(cli, mem_ctx, True,
					  SEC_RIGHTS_MAXIMUM_ALLOWED,
					  &lsa_pol),
		      "error opening lsa policy handle");

	CHECK_RPC_ERR(cli_lsa_query_info_policy(cli, mem_ctx, &lsa_pol,
						5, &domain, &domain_sid),
		      "error querying info policy");

	cli_lsa_close(cli, mem_ctx, &lsa_pol);

	cli_nt_session_close(cli); /* Done with this pipe */

	/* Create domain user */
	if (!cli_nt_session_open(cli, PI_SAMR)) {
		DEBUG(0, ("Error connecting to SAM pipe\n"));
		goto done;
	}

	CHECK_RPC_ERR(cli_samr_connect(cli, mem_ctx, 
				       SEC_RIGHTS_MAXIMUM_ALLOWED,
				       &sam_pol),
		      "could not connect to SAM database");

	
	CHECK_RPC_ERR(cli_samr_open_domain(cli, mem_ctx, &sam_pol,
					   SEC_RIGHTS_MAXIMUM_ALLOWED,
					   domain_sid, &domain_pol),
		      "could not open domain");

	/* Create domain user */
	acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname()); 
	strlower_m(acct_name);
	const_acct_name = acct_name;

	result = cli_samr_create_dom_user(cli, mem_ctx, &domain_pol,
					  acct_name, acb_info,
					  0xe005000b, &user_pol, 
					  &user_rid);

	if (!NT_STATUS_IS_OK(result) && 
	    !NT_STATUS_EQUAL(result, NT_STATUS_USER_EXISTS)) {
		d_printf("Creation of workstation account failed\n");

		/* If NT_STATUS_ACCESS_DENIED then we have a valid
		   username/password combo but the user does not have
		   administrator access. */

		if (NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_ACCESS_DENIED))
			d_printf("User specified does not have administrator privileges\n");

		goto done;
	}

	/* We *must* do this.... don't ask... */

	if (NT_STATUS_IS_OK(result))
		cli_samr_close(cli, mem_ctx, &user_pol);

	CHECK_RPC_ERR_DEBUG(cli_samr_lookup_names(cli, mem_ctx,
						  &domain_pol, flags,
						  1, &const_acct_name, 
						  &num_rids,
						  &user_rids, &name_types),
			    ("error looking up rid for user %s: %s\n",
			     acct_name, nt_errstr(result)));

	if (name_types[0] != SID_NAME_USER) {
		DEBUG(0, ("%s is not a user account (type=%d)\n", acct_name, name_types[0]));
		goto done;
	}

	user_rid = user_rids[0];
		
	/* Open handle on user */

	CHECK_RPC_ERR_DEBUG(
		cli_samr_open_user(cli, mem_ctx, &domain_pol,
				   SEC_RIGHTS_MAXIMUM_ALLOWED,
				   user_rid, &user_pol),
		("could not re-open existing user %s: %s\n",
		 acct_name, nt_errstr(result)));
	
	/* Create a random machine account password */

	{ 
		char *str;
		str = generate_random_str(DEFAULT_TRUST_ACCOUNT_PASSWORD_LENGTH);
		clear_trust_password = SMB_STRDUP(str);
		E_md4hash(clear_trust_password, md4_trust_password);
	}

	encode_pw_buffer(pwbuf, clear_trust_password, STR_UNICODE);

	/* Set password on machine account */

	ZERO_STRUCT(ctr);
	ZERO_STRUCT(p24);

	init_sam_user_info24(&p24, (char *)pwbuf,24);

	ctr.switch_value = 24;
	ctr.info.id24 = &p24;

	CHECK_RPC_ERR(cli_samr_set_userinfo(cli, mem_ctx, &user_pol, 24, 
					    &cli->user_session_key, &ctr),
		      "error setting trust account password");

	/* Why do we have to try to (re-)set the ACB to be the same as what
	   we passed in the samr_create_dom_user() call?  When a NT
	   workstation is joined to a domain by an administrator the
	   acb_info is set to 0x80.  For a normal user with "Add
	   workstations to the domain" rights the acb_info is 0x84.  I'm
	   not sure whether it is supposed to make a difference or not.  NT
	   seems to cope with either value so don't bomb out if the set
	   userinfo2 level 0x10 fails.  -tpot */

	ZERO_STRUCT(ctr);
	ctr.switch_value = 0x10;
	ctr.info.id10 = &p10;

	init_sam_user_info10(&p10, acb_info);

	/* Ignoring the return value is necessary for joining a domain
	   as a normal user with "Add workstation to domain" privilege. */

	result = cli_samr_set_userinfo2(cli, mem_ctx, &user_pol, 0x10, 
					&cli->user_session_key, &ctr);

	/* Now check the whole process from top-to-bottom */
	cli_samr_close(cli, mem_ctx, &user_pol);
	cli_nt_session_close(cli); /* Done with this pipe */

	if (!cli_nt_session_open(cli, PI_NETLOGON)) {
		DEBUG(0,("Error connecting to NETLOGON pipe\n"));
		goto done;
	}

	/* ensure that schannel uses the right domain */
	fstrcpy(cli->domain, domain);

	result = cli_nt_establish_netlogon(cli, sec_channel_type, 
					   md4_trust_password);

	if (!NT_STATUS_IS_OK(result)) {
		DEBUG(0, ("Error domain join verification (reused connection): %s\n\n",
			  nt_errstr(result)));

		if ( NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) &&
		     (sec_channel_type == SEC_CHAN_BDC) ) {
			d_printf("Please make sure that no computer account\n"
				 "named like this machine (%s) exists in the domain\n",
				 global_myname());
		}

		goto done;
	}

	/* Now store the secret in the secrets database */

	strupper_m(domain);

	if (!secrets_store_domain_sid(domain, domain_sid)) {
		DEBUG(0, ("error storing domain sid for %s\n", domain));
		goto done;
	}

	if (!secrets_store_machine_password(clear_trust_password, domain, sec_channel_type)) {
		DEBUG(0, ("error storing plaintext domain secrets for %s\n", domain));
	}

	/* double-check, connection from scratch */
	retval = net_rpc_join_ok(domain);
	
done:
	/* Close down pipe - this will clean up open policy handles */

	if (cli->nt_pipe_fnum[cli->pipe_idx])
		cli_nt_session_close(cli);

	/* Display success or failure */

	if (retval != 0) {
		fprintf(stderr,"Unable to join domain %s.\n",domain);
	} else {
		printf("Joined domain %s.\n",domain);
	}
	
	cli_shutdown(cli);

	SAFE_FREE(clear_trust_password);

	return retval;
}


/**
 * check that a join is OK
 *
 * @return A shell status integer (0 for success)
 *
 **/
int net_rpc_testjoin(int argc, const char **argv) 
{
	char *domain = smb_xstrdup(opt_target_workgroup);

	/* Display success or failure */
	if (net_rpc_join_ok(domain) != 0) {
		fprintf(stderr,"Join to domain '%s' is not valid\n",domain);
		free(domain);
		return -1;
	}

	printf("Join to '%s' is OK\n",domain);
	free(domain);
	return 0;
}