libnet_unbecome_dc.c

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/*
   Unix SMB/CIFS implementation.

   Copyright (C) Stefan Metzmacher <[e-mail]> 2006

   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 "libnet/libnet.h"
#include "libcli/composite/composite.h"
#include "libcli/cldap/cldap.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb_wrap.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/common/flags.h"
#include "librpc/gen_ndr/ndr_drsuapi_c.h"
#include "param/param.h"

/*****************************************************************************
 * Windows 2003 (w2k3) does the following steps when changing the server role
 * from domain controller back to domain member
 *
 * We mostly do the same.
 *****************************************************************************/

/*
 * lookup DC:
 * - using nbt name<1C> request and a samlogon mailslot request
 * or
 * - using a DNS SRV _ldap._tcp.dc._msdcs. request and a CLDAP netlogon request
 *
 * see: unbecomeDC_send_cldap() and unbecomeDC_recv_cldap()
 */

/*
 * Open 1st LDAP connection to the DC using admin credentials
 *
 * see: unbecomeDC_ldap_connect()
 */

/*
 * LDAP search 1st LDAP connection:
 *
 * see: unbecomeDC_ldap_rootdse()
 *
 * Request:
 *	basedn:	""
 *	scope:	base
 *	filter:	(objectClass=*)
 *	attrs:	defaultNamingContext
 *		configurationNamingContext
 * Result:
 *      ""
 *		defaultNamingContext:	<domain_partition>
 *		configurationNamingContext:CN=Configuration,<domain_partition>
 */

/*
 * LDAP search 1st LDAP connection:
 * 
 * see: unbecomeDC_ldap_computer_object()
 *
 * Request:
 *	basedn:	<domain_partition>
 *	scope:	sub
 *	filter:	(&(|(objectClass=user)(objectClass=computer))(sAMAccountName=<new_dc_account_name>))
 *	attrs:	distinguishedName
 *		userAccountControl
 * Result:
 *      CN=<new_dc_netbios_name>,CN=Domain Controllers,<domain_partition>
 *		distinguishedName:	CN=<new_dc_netbios_name>,CN=Domain Controllers,<domain_partition>
 *		userAccoountControl:	532480 <0x82000>
 */

/*
 * LDAP search 1st LDAP connection:
 * 
 * see: unbecomeDC_ldap_modify_computer()
 *
 * Request:
 *	basedn:	CN=<new_dc_netbios_name>,CN=Computers,<domain_partition>
 *	scope:	base
 *	filter:	(objectClass=*)
 *	attrs:	userAccountControl
 * Result:
 *      CN=<new_dc_netbios_name>,CN=Computers,<domain_partition>
 *		userAccoountControl:	532480 <0x82000>
 */

/*
 * LDAP modify 1st LDAP connection:
 *
 * see: unbecomeDC_ldap_modify_computer()
 * 
 * Request (replace):
 *	CN=<new_dc_netbios_name>,CN=Computers,<domain_partition>
 *	userAccoountControl:	4096 <0x1000>
 * Result:
 *	<success>
 */

/*
 * LDAP search 1st LDAP connection:
 * 
 * see: unbecomeDC_ldap_move_computer()
 *
 * Request:
 *	basedn:	<WKGUID=aa312825768811d1aded00c04fd8d5cd,<domain_partition>>
 *	scope:	base
 *	filter:	(objectClass=*)
 *	attrs:	1.1
 * Result:
 *	CN=Computers,<domain_partition>
 */

/*
 * LDAP search 1st LDAP connection:
 *
 * not implemented because it doesn't give any new information
 *
 * Request:
 *	basedn:	CN=Computers,<domain_partition>
 *	scope:	base
 *	filter:	(objectClass=*)
 *	attrs:	distinguishedName
 * Result:
 *	CN=Computers,<domain_partition>
 *		distinguishedName:	CN=Computers,<domain_partition>
 */

/*
 * LDAP modifyRDN 1st LDAP connection:
 * 
 * see: unbecomeDC_ldap_move_computer()
 *
 * Request:
 *      entry:		CN=<new_dc_netbios_name>,CN=Domain Controllers,<domain_partition>
 *	newrdn:		CN=<new_dc_netbios_name>
 *	deleteoldrdn:	TRUE
 *	newparent:	CN=Computers,<domain_partition>
 * Result:
 *	<success>
 */

/*
 * LDAP unbind on the 1st LDAP connection
 *
 * not implemented, because it's not needed...
 */

/*
 * Open 1st DRSUAPI connection to the DC using admin credentials
 * DsBind with DRSUAPI_DS_BIND_GUID ("e24d201a-4fd6-11d1-a3da-0000f875ae0d")
 *
 * see:	unbecomeDC_drsuapi_connect_send(), unbecomeDC_drsuapi_connect_recv(),
 *	unbecomeDC_drsuapi_bind_send() and unbecomeDC_drsuapi_bind_recv()
 */

/*
 * DsRemoveDsServer to remove the 
 * CN=<machine_name>,CN=Servers,CN=<site_name>,CN=Configuration,<domain_partition>
 * and CN=NTDS Settings,CN=<machine_name>,CN=Servers,CN=<site_name>,CN=Configuration,<domain_partition>
 * on the 1st DRSUAPI connection
 *
 * see: unbecomeDC_drsuapi_remove_ds_server_send() and unbecomeDC_drsuapi_remove_ds_server_recv()
 */

/*
 * DsUnbind on the 1st DRSUAPI connection
 *
 * not implemented, because it's not needed...
 */


struct libnet_UnbecomeDC_state {
	struct composite_context *creq;

	struct libnet_context *libnet;

	struct {
		struct cldap_socket *sock;
		struct cldap_netlogon io;
		struct NETLOGON_SAM_LOGON_RESPONSE_EX netlogon;
	} cldap;

	struct {
		struct ldb_context *ldb;
	} ldap;

	struct {
		struct dcerpc_binding *binding;
		struct dcerpc_pipe *pipe;
		struct drsuapi_DsBind bind_r;
		struct GUID bind_guid;
		struct drsuapi_DsBindInfoCtr bind_info_ctr;
		struct drsuapi_DsBindInfo28 local_info28;
		struct drsuapi_DsBindInfo28 remote_info28;
		struct policy_handle bind_handle;
		struct drsuapi_DsRemoveDSServer rm_ds_srv_r;
	} drsuapi;

	struct {
		/* input */
		const char *dns_name;
		const char *netbios_name;

		/* constructed */
		struct GUID guid;
		const char *dn_str;
	} domain;

	struct {
		/* constructed */
		const char *config_dn_str;
	} forest;

	struct {
		/* input */
		const char *address;

		/* constructed */
		const char *dns_name;
		const char *netbios_name;
		const char *site_name;
	} source_dsa;

	struct {
		/* input */
		const char *netbios_name;

		/* constructed */
		const char *dns_name;
		const char *site_name;
		const char *computer_dn_str;
		const char *server_dn_str;
		uint32_t user_account_control;
	} dest_dsa;
};

static void unbecomeDC_recv_cldap(struct cldap_request *req);

static void unbecomeDC_send_cldap(struct libnet_UnbecomeDC_state *s)
{
	struct composite_context *c = s->creq;
	struct cldap_request *req;

	s->cldap.io.in.dest_address	= s->source_dsa.address;
	s->cldap.io.in.dest_port	= lp_cldap_port(s->libnet->lp_ctx);
	s->cldap.io.in.realm		= s->domain.dns_name;
	s->cldap.io.in.host		= s->dest_dsa.netbios_name;
	s->cldap.io.in.user		= NULL;
	s->cldap.io.in.domain_guid	= NULL;
	s->cldap.io.in.domain_sid	= NULL;
	s->cldap.io.in.acct_control	= -1;
	s->cldap.io.in.version		= NETLOGON_NT_VERSION_5 | NETLOGON_NT_VERSION_5EX;
	s->cldap.io.in.map_response	= true;

	s->cldap.sock = cldap_socket_init(s, s->libnet->event_ctx,
					  lp_iconv_convenience(s->libnet->lp_ctx));
	if (composite_nomem(s->cldap.sock, c)) return;

	req = cldap_netlogon_send(s->cldap.sock, &s->cldap.io);
	if (composite_nomem(req, c)) return;
	req->async.fn		= unbecomeDC_recv_cldap;
	req->async.private	= s;
}

static void unbecomeDC_connect_ldap(struct libnet_UnbecomeDC_state *s);

static void unbecomeDC_recv_cldap(struct cldap_request *req)
{
	struct libnet_UnbecomeDC_state *s = talloc_get_type(req->async.private,
					    struct libnet_UnbecomeDC_state);
	struct composite_context *c = s->creq;

	c->status = cldap_netlogon_recv(req, s, &s->cldap.io);
	if (!composite_is_ok(c)) return;

	s->cldap.netlogon = s->cldap.io.out.netlogon.nt5_ex;

	s->domain.dns_name		= s->cldap.netlogon.dns_domain;
	s->domain.netbios_name		= s->cldap.netlogon.domain;
	s->domain.guid			= s->cldap.netlogon.domain_uuid;

	s->source_dsa.dns_name		= s->cldap.netlogon.pdc_dns_name;
	s->source_dsa.netbios_name	= s->cldap.netlogon.pdc_name;
	s->source_dsa.site_name		= s->cldap.netlogon.server_site;

	s->dest_dsa.site_name		= s->cldap.netlogon.client_site;

	unbecomeDC_connect_ldap(s);
}

static NTSTATUS unbecomeDC_ldap_connect(struct libnet_UnbecomeDC_state *s)
{
	char *url;

	url = talloc_asprintf(s, "ldap://%s/", s->source_dsa.dns_name);
	NT_STATUS_HAVE_NO_MEMORY(url);

	s->ldap.ldb = ldb_wrap_connect(s, s->libnet->event_ctx, s->libnet->lp_ctx, url,
				       NULL,
				       s->libnet->cred,
				       0, NULL);
	talloc_free(url);
	if (s->ldap.ldb == NULL) {
		return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
	}

	return NT_STATUS_OK;
}

static NTSTATUS unbecomeDC_ldap_rootdse(struct libnet_UnbecomeDC_state *s)
{
	int ret;
	struct ldb_result *r;
	struct ldb_dn *basedn;
	static const char *attrs[] = {
		"defaultNamingContext",
		"configurationNamingContext",
		NULL
	};

	basedn = ldb_dn_new(s, s->ldap.ldb, NULL);
	NT_STATUS_HAVE_NO_MEMORY(basedn);

	ret = ldb_search(s->ldap.ldb, basedn, LDB_SCOPE_BASE, 
			 "(objectClass=*)", attrs, &r);
	talloc_free(basedn);
	if (ret != LDB_SUCCESS) {
		return NT_STATUS_LDAP(ret);
	} else if (r->count != 1) {
		talloc_free(r);
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}
	talloc_steal(s, r);

	s->domain.dn_str	= ldb_msg_find_attr_as_string(r->msgs[0], "defaultNamingContext", NULL);
	if (!s->domain.dn_str) return NT_STATUS_INVALID_NETWORK_RESPONSE;
	talloc_steal(s, s->domain.dn_str);

	s->forest.config_dn_str	= ldb_msg_find_attr_as_string(r->msgs[0], "configurationNamingContext", NULL);
	if (!s->forest.config_dn_str) return NT_STATUS_INVALID_NETWORK_RESPONSE;
	talloc_steal(s, s->forest.config_dn_str);

	s->dest_dsa.server_dn_str = talloc_asprintf(s, "CN=%s,CN=Servers,CN=%s,CN=Sites,%s",
						    s->dest_dsa.netbios_name,
						    s->dest_dsa.site_name,
				                    s->forest.config_dn_str);
	NT_STATUS_HAVE_NO_MEMORY(s->dest_dsa.server_dn_str);

	talloc_free(r);
	return NT_STATUS_OK;
}