/* 
   Unix SMB/CIFS implementation.

   endpoint server for the drsuapi pipe
   DsCrackNames()

   Copyright (C) Stefan Metzmacher 2004
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   
   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 "librpc/gen_ndr/drsuapi.h"
#include "rpc_server/common/common.h"
#include "lib/events/events.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
#include "libcli/ldap/ldap_ndr.h"
#include "libcli/security/security.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "auth/auth.h"
#include "util/util_ldb.h"
#include "dsdb/samdb/samdb.h"
#include "param/param.h"

static WERROR DsCrackNameOneFilter(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
				   struct smb_krb5_context *smb_krb5_context,
				   uint32_t format_flags, uint32_t format_offered, uint32_t format_desired,
				   struct ldb_dn *name_dn, const char *name, 
				   const char *domain_filter, const char *result_filter, 
				   struct drsuapi_DsNameInfo1 *info1);
static WERROR DsCrackNameOneSyntactical(TALLOC_CTX *mem_ctx,
					uint32_t format_offered, uint32_t format_desired,
					struct ldb_dn *name_dn, const char *name, 
					struct drsuapi_DsNameInfo1 *info1);

static WERROR dns_domain_from_principal(TALLOC_CTX *mem_ctx, struct smb_krb5_context *smb_krb5_context, 
					const char *name, 
					struct drsuapi_DsNameInfo1 *info1) 
{
	krb5_error_code ret;
	krb5_principal principal;
	/* perhaps it's a principal with a realm, so return the right 'domain only' response */
	char **realm;
	ret = krb5_parse_name_flags(smb_krb5_context->krb5_context, name, 
				    KRB5_PRINCIPAL_PARSE_MUST_REALM, &principal);
	if (ret) {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	}

	/* This isn't an allocation assignemnt, so it is free'ed with the krb5_free_principal */
	realm = krb5_princ_realm(smb_krb5_context->krb5_context, principal);
	
	info1->dns_domain_name	= talloc_strdup(mem_ctx, *realm);
	krb5_free_principal(smb_krb5_context->krb5_context, principal);
	
	W_ERROR_HAVE_NO_MEMORY(info1->dns_domain_name);
	
	info1->status = DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY;
	return WERR_OK;
}		

static enum drsuapi_DsNameStatus LDB_lookup_spn_alias(krb5_context context, struct ldb_context *ldb_ctx, 
						      TALLOC_CTX *mem_ctx,
						      const char *alias_from,
						      char **alias_to)
{
	int i;
	int ret;
	struct ldb_result *res;
	struct ldb_message_element *spnmappings;
	TALLOC_CTX *tmp_ctx;
	struct ldb_dn *service_dn;
	char *service_dn_str;

	const char *directory_attrs[] = {
		"sPNMappings", 
		NULL
	};

	tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		return DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	}

	service_dn = ldb_dn_new(tmp_ctx, ldb_ctx, "CN=Directory Service,CN=Windows NT,CN=Services");
	if ( ! ldb_dn_add_base(service_dn, samdb_config_dn(ldb_ctx))) {
		return DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	}
	service_dn_str = ldb_dn_alloc_linearized(tmp_ctx, service_dn);
	if ( ! service_dn_str) {
		return DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	}

	ret = ldb_search(ldb_ctx, service_dn, LDB_SCOPE_BASE, "(objectClass=nTDSService)",
			 directory_attrs, &res);

	if (ret != LDB_SUCCESS && ret != LDB_ERR_NO_SUCH_OBJECT) {
		DEBUG(1, ("ldb_search: dn: %s not found: %s", service_dn_str, ldb_errstring(ldb_ctx)));
		return DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	} else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
		DEBUG(1, ("ldb_search: dn: %s not found", service_dn_str));
		return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
	} else if (res->count != 1) {
		talloc_free(res);
		DEBUG(1, ("ldb_search: dn: %s not found", service_dn_str));
		return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
	}
	talloc_steal(tmp_ctx, res);
	
	spnmappings = ldb_msg_find_element(res->msgs[0], "sPNMappings");
	if (!spnmappings || spnmappings->num_values == 0) {
		DEBUG(1, ("ldb_search: dn: %s no sPNMappings attribute", service_dn_str));
		talloc_free(tmp_ctx);
		return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
	}

	for (i = 0; i < spnmappings->num_values; i++) {
		char *mapping, *p, *str;
		mapping = talloc_strdup(tmp_ctx, 
					(const char *)spnmappings->values[i].data);
		if (!mapping) {
			DEBUG(1, ("LDB_lookup_spn_alias: ldb_search: dn: %s did not have an sPNMapping\n", service_dn_str));
			talloc_free(tmp_ctx);
			return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		}
		
		/* C string manipulation sucks */
		
		p = strchr(mapping, '=');
		if (!p) {
			DEBUG(1, ("ldb_search: dn: %s sPNMapping malformed: %s\n", 
				  service_dn_str, mapping));
			talloc_free(tmp_ctx);
			return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		}
		p[0] = '\0';
		p++;
		do {
			str = p;
			p = strchr(p, ',');
			if (p) {
				p[0] = '\0';
				p++;
			}
			if (strcasecmp(str, alias_from) == 0) {
				*alias_to = mapping;
				talloc_steal(mem_ctx, mapping);
				talloc_free(tmp_ctx);
				return DRSUAPI_DS_NAME_STATUS_OK;
			}
		} while (p);
	}
	DEBUG(4, ("LDB_lookup_spn_alias: no alias for service %s applicable\n", alias_from));
	talloc_free(tmp_ctx);
	return DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
}

/* When cracking a ServicePrincipalName, many services may be served
 * by the host/ servicePrincipalName.  The incoming query is for cifs/
 * but we translate it here, and search on host/.  This is done after
 * the cifs/ entry has been searched for, making this a fallback */

static WERROR DsCrackNameSPNAlias(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
				  struct smb_krb5_context *smb_krb5_context,
				  uint32_t format_flags, uint32_t format_offered, uint32_t format_desired,
				  const char *name, struct drsuapi_DsNameInfo1 *info1)
{
	WERROR wret;
	krb5_error_code ret;
	krb5_principal principal;
	const char *service, *dns_name;
	char *new_service;
	char *new_princ;
	enum drsuapi_DsNameStatus namestatus;
	
	/* parse principal */
	ret = krb5_parse_name_flags(smb_krb5_context->krb5_context, 
				    name, KRB5_PRINCIPAL_PARSE_NO_REALM, &principal);
	if (ret) {
		DEBUG(2, ("Could not parse principal: %s: %s",
			  name, smb_get_krb5_error_message(smb_krb5_context->krb5_context, 
							   ret, mem_ctx)));
		return WERR_NOMEM;
	}
	
	/* grab cifs/, http/ etc */
	
	/* This is checked for in callers, but be safe */
	if (principal->name.name_string.len < 2) {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	}
	service = principal->name.name_string.val[0];
	dns_name = principal->name.name_string.val[1];
	
	/* MAP it */
	namestatus = LDB_lookup_spn_alias(smb_krb5_context->krb5_context, 
					  sam_ctx, mem_ctx, 
					  service, &new_service);
	
	if (namestatus == DRSUAPI_DS_NAME_STATUS_NOT_FOUND) {
		info1->status		= DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY;
		info1->dns_domain_name	= talloc_strdup(mem_ctx, dns_name);
		if (!info1->dns_domain_name) {
			krb5_free_principal(smb_krb5_context->krb5_context, principal);
			return WERR_NOMEM;
		}
		return WERR_OK;
	} else if (namestatus != DRSUAPI_DS_NAME_STATUS_OK) {
		info1->status = namestatus;
		krb5_free_principal(smb_krb5_context->krb5_context, principal);
		return WERR_OK;
	}
	
	/* ooh, very nasty playing around in the Principal... */
	free(principal->name.name_string.val[0]);
	principal->name.name_string.val[0] = strdup(new_service);
	if (!principal->name.name_string.val[0]) {
		krb5_free_principal(smb_krb5_context->krb5_context, principal);
		return WERR_NOMEM;
	}
	
	/* reform principal */
	ret = krb5_unparse_name_flags(smb_krb5_context->krb5_context, principal, 
				      KRB5_PRINCIPAL_UNPARSE_NO_REALM, &new_princ);

	if (ret) {
		krb5_free_principal(smb_krb5_context->krb5_context, principal);
		return WERR_NOMEM;
	}
	
	wret = DsCrackNameOneName(sam_ctx, mem_ctx, format_flags, format_offered, format_desired,
				  new_princ, info1);
	free(new_princ);
	if (W_ERROR_IS_OK(wret) && (info1->status == DRSUAPI_DS_NAME_STATUS_NOT_FOUND)) {
		info1->status		= DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY;
		info1->dns_domain_name	= talloc_strdup(mem_ctx, dns_name);
		if (!info1->dns_domain_name) {
			wret = WERR_NOMEM;
		}
	}
	krb5_free_principal(smb_krb5_context->krb5_context, principal);
	return wret;
}

/* Subcase of CrackNames, for the userPrincipalName */

static WERROR DsCrackNameUPN(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
			     struct smb_krb5_context *smb_krb5_context,
			     uint32_t format_flags, uint32_t format_offered, uint32_t format_desired,
			     const char *name, struct drsuapi_DsNameInfo1 *info1)
{
	int ldb_ret;
	WERROR status;
	const char *domain_filter = NULL;
	const char *result_filter = NULL;
	krb5_error_code ret;
	krb5_principal principal;
	char **realm;
	char *unparsed_name_short;
	const char *domain_attrs[] = { NULL };
	struct ldb_result *domain_res = NULL;
	
	/* Prevent recursion */
	if (!name) {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	}

	ret = krb5_parse_name_flags(smb_krb5_context->krb5_context, name, 
				    KRB5_PRINCIPAL_PARSE_MUST_REALM, &principal);
	if (ret) {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	}
	
	realm = krb5_princ_realm(smb_krb5_context->krb5_context, principal);

	ldb_ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &domain_res, 
				     samdb_partitions_dn(sam_ctx, mem_ctx), 
				     LDB_SCOPE_ONELEVEL,
				     domain_attrs,
				     "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
				     ldb_binary_encode_string(mem_ctx, *realm), 
				     ldb_binary_encode_string(mem_ctx, *realm));

	if (ldb_ret != LDB_SUCCESS) {
		DEBUG(2, ("DsCrackNameUPN domain ref search failed: %s", ldb_errstring(sam_ctx)));
		info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
		return WERR_OK;
	}
	
	switch (domain_res->count) {
	case 1:
		break;
	case 0:
		return dns_domain_from_principal(mem_ctx, smb_krb5_context, 
						 name, info1);
	default:
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
		return WERR_OK;
	}
	
	ret = krb5_unparse_name_flags(smb_krb5_context->krb5_context, principal, 
				      KRB5_PRINCIPAL_UNPARSE_NO_REALM, &unparsed_name_short);
	krb5_free_principal(smb_krb5_context->krb5_context, principal);
		
	if (ret) {
		free(unparsed_name_short);
		return WERR_NOMEM;
	}
	
	/* This may need to be extended for more userPrincipalName variations */
	result_filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))", 
					ldb_binary_encode_string(mem_ctx, unparsed_name_short));

	domain_filter = talloc_asprintf(mem_ctx, "(distinguishedName=%s)", ldb_dn_get_linearized(domain_res->msgs[0]->dn));

	if (!result_filter || !domain_filter) {
		free(unparsed_name_short);
		return WERR_NOMEM;
	}
	status = DsCrackNameOneFilter(sam_ctx, mem_ctx, 
				      smb_krb5_context, 
				      format_flags, format_offered, format_desired, 
				      NULL, unparsed_name_short, domain_filter, result_filter, 
				      info1);
	free(unparsed_name_short);

	return status;
}

/* Crack a single 'name', from format_offered into format_desired, returning the result in info1 */

WERROR DsCrackNameOneName(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
			  uint32_t format_flags, uint32_t format_offered, uint32_t format_desired,
			  const char *name, struct drsuapi_DsNameInfo1 *info1)
{
	krb5_error_code ret;
	const char *domain_filter = NULL;
	const char *result_filter = NULL;
	struct ldb_dn *name_dn = NULL;

	struct smb_krb5_context *smb_krb5_context;
	ret = smb_krb5_init_context(mem_ctx, 
				    ldb_get_event_context(sam_ctx),
				    (struct loadparm_context *)ldb_get_opaque(sam_ctx, "loadparm"), 
				    &smb_krb5_context);
				
	if (ret) {
		return WERR_NOMEM;
	}

	info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	info1->dns_domain_name = NULL;
	info1->result_name = NULL;

	if (!name) {
		return WERR_INVALID_PARAM;
	}

	/* TODO: - fill the correct names in all cases!
	 *       - handle format_flags
	 */

	/* here we need to set the domain_filter and/or the result_filter */
	switch (format_offered) {
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL:
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX:
	{
		char *str, *s, *account;
		
		if (strlen(name) == 0) {
			info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
			return WERR_OK;
		}
		
		str = talloc_strdup(mem_ctx, name);
		W_ERROR_HAVE_NO_MEMORY(str);
		
		if (format_offered == DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX) {
			/* Look backwards for the \n, and replace it with / */
			s = strrchr(str, '\n');
			if (!s) {
				info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
				return WERR_OK;
			}
			s[0] = '/';
		}

		s = strchr(str, '/');
		if (!s) {
			/* there must be at least one / */
			info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
			return WERR_OK;
		}
		
		s[0] = '\0';
		s++;

		domain_filter = talloc_asprintf(mem_ctx, "(&(objectClass=crossRef)(ncName=%s))", 
						ldb_dn_get_linearized(samdb_dns_domain_to_dn(sam_ctx, mem_ctx, str)));
		W_ERROR_HAVE_NO_MEMORY(domain_filter);

		/* There may not be anything after the domain component (search for the domain itself) */
		if (s[0]) {
			
			account = strrchr(s, '/');
			if (!account) {
				account = s;
			} else {
				account++;
			}
			account = ldb_binary_encode_string(mem_ctx, account);
			W_ERROR_HAVE_NO_MEMORY(account);
			result_filter = talloc_asprintf(mem_ctx, "(name=%s)",
							account);	       
			W_ERROR_HAVE_NO_MEMORY(result_filter);
		}
		break;
	}
	case DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT: {
		char *p;
		char *domain;
		const char *account = NULL;
		
		domain = talloc_strdup(mem_ctx, name);
		W_ERROR_HAVE_NO_MEMORY(domain);
		
		p = strchr(domain, '\\');
		if (!p) {
			/* invalid input format */
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		}
		p[0] = '\0';
		
		if (p[1]) {
			account = &p[1];
		}
		
		domain_filter = talloc_asprintf(mem_ctx, 
						"(&(&(nETBIOSName=%s)(objectclass=crossRef))(ncName=*))", 
						ldb_binary_encode_string(mem_ctx, domain));
		W_ERROR_HAVE_NO_MEMORY(domain_filter);
		if (account) {
			result_filter = talloc_asprintf(mem_ctx, "(sAMAccountName=%s)",
							ldb_binary_encode_string(mem_ctx, account));
			W_ERROR_HAVE_NO_MEMORY(result_filter);
		}
		
		talloc_free(domain);
		break;
	}

		/* A LDAP DN as a string */
	case DRSUAPI_DS_NAME_FORMAT_FQDN_1779: {
		domain_filter = NULL;
		name_dn = ldb_dn_new(mem_ctx, sam_ctx, name);
		if (! ldb_dn_validate(name_dn)) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		}
		break;
	}

		/* A GUID as a string */
	case DRSUAPI_DS_NAME_FORMAT_GUID: {
		struct GUID guid;
		char *ldap_guid;
		NTSTATUS nt_status;
		domain_filter = NULL;

		nt_status = GUID_from_string(name, &guid);
		if (!NT_STATUS_IS_OK(nt_status)) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		}
			
		ldap_guid = ldap_encode_ndr_GUID(mem_ctx, &guid);
		if (!ldap_guid) {
			return WERR_NOMEM;
		}
		result_filter = talloc_asprintf(mem_ctx, "(objectGUID=%s)",
						ldap_guid);
		W_ERROR_HAVE_NO_MEMORY(result_filter);
		break;
	}
	case DRSUAPI_DS_NAME_FORMAT_DISPLAY: {
		domain_filter = NULL;

		result_filter = talloc_asprintf(mem_ctx, "(|(displayName=%s)(samAccountName=%s))",
						ldb_binary_encode_string(mem_ctx, name), 
						ldb_binary_encode_string(mem_ctx, name));
		W_ERROR_HAVE_NO_MEMORY(result_filter);
		break;
	}
	
		/* A S-1234-5678 style string */
	case DRSUAPI_DS_NAME_FORMAT_SID_OR_SID_HISTORY: {
		struct dom_sid *sid = dom_sid_parse_talloc(mem_ctx, name);
		char *ldap_sid;
									    
		domain_filter = NULL;
		if (!sid) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		}
		ldap_sid = ldap_encode_ndr_dom_sid(mem_ctx, 
						   sid);
		if (!ldap_sid) {
			return WERR_NOMEM;
		}
		result_filter = talloc_asprintf(mem_ctx, "(objectSid=%s)",
						ldap_sid);
		W_ERROR_HAVE_NO_MEMORY(result_filter);
		break;
	}
	case DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL: {
		krb5_principal principal;
		char *unparsed_name;
		ret = krb5_parse_name(smb_krb5_context->krb5_context, name, &principal);
		if (ret) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		}
		
		domain_filter = NULL;
		
		ret = krb5_unparse_name(smb_krb5_context->krb5_context, principal, &unparsed_name);
		if (ret) {
			krb5_free_principal(smb_krb5_context->krb5_context, principal);
			return WERR_NOMEM;
		}

		krb5_free_principal(smb_krb5_context->krb5_context, principal);
		result_filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(userPrincipalName=%s))", 
						ldb_binary_encode_string(mem_ctx, unparsed_name));
		
		free(unparsed_name);
		W_ERROR_HAVE_NO_MEMORY(result_filter);
		break;
	}
	case DRSUAPI_DS_NAME_FORMAT_SERVICE_PRINCIPAL: {
		krb5_principal principal;
		char *unparsed_name_short;
		char *service;
		ret = krb5_parse_name(smb_krb5_context->krb5_context, name, &principal);
		if (ret == 0 && principal->name.name_string.len < 2) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			krb5_free_principal(smb_krb5_context->krb5_context, principal);
			return WERR_OK;
		}
		ret = krb5_parse_name_flags(smb_krb5_context->krb5_context, name, 
					    KRB5_PRINCIPAL_PARSE_NO_REALM, &principal);
		if (ret) {
			krb5_free_principal(smb_krb5_context->krb5_context, principal);

			return dns_domain_from_principal(mem_ctx, smb_krb5_context,
							 name, info1);
		}

		domain_filter = NULL;
		
		ret = krb5_unparse_name_flags(smb_krb5_context->krb5_context, principal, 
					      KRB5_PRINCIPAL_UNPARSE_NO_REALM, &unparsed_name_short);
		if (ret) {
			krb5_free_principal(smb_krb5_context->krb5_context, principal);
			return WERR_NOMEM;
		}

		service = principal->name.name_string.val[0];
		if ((principal->name.name_string.len == 2) && (strcasecmp(service, "host") == 0)) {
			/* the 'cn' attribute is just the leading part of the name */
			char *computer_name;
			computer_name = talloc_strndup(mem_ctx, principal->name.name_string.val[1], 
						      strcspn(principal->name.name_string.val[1], "."));
			if (computer_name == NULL) {
				return WERR_NOMEM;
			}

			result_filter = talloc_asprintf(mem_ctx, "(|(&(servicePrincipalName=%s)(objectClass=user))(&(cn=%s)(objectClass=computer)))", 
							ldb_binary_encode_string(mem_ctx, unparsed_name_short), 
							ldb_binary_encode_string(mem_ctx, computer_name));
		} else {
			result_filter = talloc_asprintf(mem_ctx, "(&(servicePrincipalName=%s)(objectClass=user))",
							ldb_binary_encode_string(mem_ctx, unparsed_name_short));
		}
		krb5_free_principal(smb_krb5_context->krb5_context, principal);
		free(unparsed_name_short);
		W_ERROR_HAVE_NO_MEMORY(result_filter);
		
		break;
	}
	default: {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	}

	}

	if (format_flags & DRSUAPI_DS_NAME_FLAG_SYNTACTICAL_ONLY) {
		return DsCrackNameOneSyntactical(mem_ctx, format_offered, format_desired,
						 name_dn, name, info1);
	}
	
	return DsCrackNameOneFilter(sam_ctx, mem_ctx, 
				    smb_krb5_context, 
				    format_flags, format_offered, format_desired, 
				    name_dn, name, 
				    domain_filter, result_filter, 
				    info1);
}

/* Subcase of CrackNames.  It is possible to translate a LDAP-style DN
 * (FQDN_1779) into a canoical name without actually searching the
 * database */

static WERROR DsCrackNameOneSyntactical(TALLOC_CTX *mem_ctx,
					uint32_t format_offered, uint32_t format_desired,
					struct ldb_dn *name_dn, const char *name, 
					struct drsuapi_DsNameInfo1 *info1)
{
	char *cracked;
	if (format_offered != DRSUAPI_DS_NAME_FORMAT_FQDN_1779) {
		info1->status = DRSUAPI_DS_NAME_STATUS_NO_SYNTACTICAL_MAPPING;
		return WERR_OK;
	}

	switch (format_desired) {
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL: 
		cracked = ldb_dn_canonical_string(mem_ctx, name_dn);
		break;
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX:
		cracked = ldb_dn_canonical_ex_string(mem_ctx, name_dn);
		break;
	default:
		info1->status = DRSUAPI_DS_NAME_STATUS_NO_SYNTACTICAL_MAPPING;
		return WERR_OK;
	}
	info1->status = DRSUAPI_DS_NAME_STATUS_OK;
	info1->result_name	= cracked;
	if (!cracked) {
		return WERR_NOMEM;
	}
	
	return WERR_OK;	
}

/* Given a filter for the domain, and one for the result, perform the
 * ldb search. The format offered and desired flags change the
 * behaviours, including what attributes to return.
 *
 * The smb_krb5_context is required because we use the krb5 libs for principal parsing
 */

static WERROR DsCrackNameOneFilter(struct ldb_context *sam_ctx, TALLOC_CTX *mem_ctx,
				   struct smb_krb5_context *smb_krb5_context,
				   uint32_t format_flags, uint32_t format_offered, uint32_t format_desired,
				   struct ldb_dn *name_dn, const char *name, 
				   const char *domain_filter, const char *result_filter, 
				   struct drsuapi_DsNameInfo1 *info1)
{
	int ldb_ret;
	struct ldb_result *domain_res = NULL;
	const char * const *domain_attrs;
	const char * const *result_attrs;
	struct ldb_message **result_res = NULL;
	struct ldb_message *result = NULL;
	struct ldb_dn *result_basedn = NULL;
	int i;
	char *p;
	struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);

	const char * const _domain_attrs_1779[] = { "ncName", "dnsRoot", NULL};
	const char * const _result_attrs_null[] = { NULL };

	const char * const _domain_attrs_canonical[] = { "ncName", "dnsRoot", NULL};
	const char * const _result_attrs_canonical[] = { "canonicalName", NULL };

	const char * const _domain_attrs_nt4[] = { "ncName", "dnsRoot", "nETBIOSName", NULL};
	const char * const _result_attrs_nt4[] = { "sAMAccountName", "objectSid", "objectClass", NULL};
		
	const char * const _domain_attrs_guid[] = { "ncName", "dnsRoot", NULL};
	const char * const _result_attrs_guid[] = { "objectGUID", NULL};
		
	const char * const _domain_attrs_display[] = { "ncName", "dnsRoot", NULL};
	const char * const _result_attrs_display[] = { "displayName", "samAccountName", NULL};

	const char * const _domain_attrs_none[] = { "ncName", "dnsRoot" , NULL};
	const char * const _result_attrs_none[] = { NULL};

	/* here we need to set the attrs lists for domain and result lookups */
	switch (format_desired) {
	case DRSUAPI_DS_NAME_FORMAT_FQDN_1779:
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX:
		domain_attrs = _domain_attrs_1779;
		result_attrs = _result_attrs_null;
		break;
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL:
		domain_attrs = _domain_attrs_canonical;
		result_attrs = _result_attrs_canonical;
		break;
	case DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT:
		domain_attrs = _domain_attrs_nt4;
		result_attrs = _result_attrs_nt4;
		break;
	case DRSUAPI_DS_NAME_FORMAT_GUID:		
		domain_attrs = _domain_attrs_guid;
		result_attrs = _result_attrs_guid;
		break;
	case DRSUAPI_DS_NAME_FORMAT_DISPLAY:		
		domain_attrs = _domain_attrs_display;
		result_attrs = _result_attrs_display;
		break;
	default:
		domain_attrs = _domain_attrs_none;
		result_attrs = _result_attrs_none;
		break;
	}

	if (domain_filter) {
		/* if we have a domain_filter look it up and set the result_basedn and the dns_domain_name */
		ldb_ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &domain_res, 
					     partitions_basedn,
					     LDB_SCOPE_ONELEVEL,
					     domain_attrs,
					     "%s", domain_filter);
		
		if (ldb_ret != LDB_SUCCESS) {
			DEBUG(2, ("DsCrackNameOneFilter domain ref search failed: %s", ldb_errstring(sam_ctx)));
			info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
			return WERR_OK;
		}
		
		switch (domain_res->count) {
		case 1:
			break;
		case 0:
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
			return WERR_OK;
		default:
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
			return WERR_OK;
		}

		info1->dns_domain_name	= samdb_result_string(domain_res->msgs[0], "dnsRoot", NULL);
		W_ERROR_HAVE_NO_MEMORY(info1->dns_domain_name);
		info1->status		= DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY;
	} else {
		info1->dns_domain_name	= NULL;
		info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
	}

	if (result_filter) {
		int ret;
		struct ldb_result *res;
		if (domain_res) {
			result_basedn = samdb_result_dn(sam_ctx, mem_ctx, domain_res->msgs[0], "ncName", NULL);
			
			ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &res, 
						 result_basedn, LDB_SCOPE_SUBTREE, 
						 result_attrs, "%s", result_filter);
			if (ret != LDB_SUCCESS) {
				talloc_free(result_res);
				info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
				return WERR_OK;
			}
			ldb_ret = res->count;
			result_res = res->msgs;
		} else {
			/* search with the 'phantom root' flag */
			struct ldb_request *req;

			res = talloc_zero(mem_ctx, struct ldb_result);
			W_ERROR_HAVE_NO_MEMORY(res);
			
			ret = ldb_build_search_req(&req, sam_ctx, mem_ctx,
						   ldb_get_root_basedn(sam_ctx),
						   LDB_SCOPE_SUBTREE,
						   result_filter,
						   result_attrs,
						   NULL,
						   res,
						   ldb_search_default_callback);
			if (ret == LDB_SUCCESS) {
				struct ldb_search_options_control *search_options;
				search_options = talloc(req, struct ldb_search_options_control);
				W_ERROR_HAVE_NO_MEMORY(search_options);
				search_options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;

				ret = ldb_request_add_control(req, LDB_CONTROL_SEARCH_OPTIONS_OID, false, search_options);
			}
			if (ret != LDB_SUCCESS) {
				talloc_free(res);
				info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
				return WERR_OK;
			}
			
			ldb_set_timeout(sam_ctx, req, 0); /* use default timeout */
			
			ret = ldb_request(sam_ctx, req);
			
			if (ret == LDB_SUCCESS) {
				ret = ldb_wait(req->handle, LDB_WAIT_ALL);
			}
			
			talloc_free(req);

			if (ret != LDB_SUCCESS) {
				DEBUG(2, ("DsCrackNameOneFilter phantom root search failed: %s", 
					  ldb_errstring(sam_ctx)));
				info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
				return WERR_OK;
			}
			ldb_ret = res->count;
			result_res = res->msgs;
		}
	} else if (format_offered == DRSUAPI_DS_NAME_FORMAT_FQDN_1779) {
		ldb_ret = gendb_search_dn(sam_ctx, mem_ctx, name_dn, &result_res,
					  result_attrs);
	} else if (domain_res) {
		name_dn = samdb_result_dn(sam_ctx, mem_ctx, domain_res->msgs[0], "ncName", NULL);
		ldb_ret = gendb_search_dn(sam_ctx, mem_ctx, name_dn, &result_res,
					  result_attrs);
	} else {
		/* Can't happen */
		DEBUG(0, ("LOGIC ERROR: DsCrackNameOneFilter domain ref search not availible: This can't happen..."));
		info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
		return WERR_OK;
	}

	switch (ldb_ret) {
	case 1:
		result = result_res[0];
		break;
	case 0:
		switch (format_offered) {
		case DRSUAPI_DS_NAME_FORMAT_SERVICE_PRINCIPAL: 
			return DsCrackNameSPNAlias(sam_ctx, mem_ctx, 
						   smb_krb5_context, 
						   format_flags, format_offered, format_desired,
						   name, info1);
			
		case DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL:
			return DsCrackNameUPN(sam_ctx, mem_ctx, smb_krb5_context, 
					      format_flags, format_offered, format_desired,
					      name, info1);
		}
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		return WERR_OK;
	case -1:
		DEBUG(2, ("DsCrackNameOneFilter result search failed: %s", ldb_errstring(sam_ctx)));
		info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
		return WERR_OK;
	default:
		switch (format_offered) {
		case DRSUAPI_DS_NAME_FORMAT_CANONICAL:
		case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX:
		{
			const char *canonical_name = NULL; /* Not required, but we get warnings... */
			/* We may need to manually filter further */
			for (i = 0; i < ldb_ret; i++) {
				switch (format_offered) {
				case DRSUAPI_DS_NAME_FORMAT_CANONICAL:
					canonical_name = ldb_dn_canonical_string(mem_ctx, result_res[i]->dn);
					break;
				case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX:
					canonical_name = ldb_dn_canonical_ex_string(mem_ctx, result_res[i]->dn);
					break;
				}
				if (strcasecmp_m(canonical_name, name) == 0) {
					result = result_res[i];
					break;
				}
			}
			if (!result) {
				info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
				return WERR_OK;
			}
		}
		default:
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
			return WERR_OK;
		}
	}

	info1->dns_domain_name = ldb_dn_canonical_string(mem_ctx, result->dn);
	W_ERROR_HAVE_NO_MEMORY(info1->dns_domain_name);
	p = strchr(info1->dns_domain_name, '/');
	if (p) {
		p[0] = '\0';
	}
	
	/* here we can use result and domain_res[0] */
	switch (format_desired) {
	case DRSUAPI_DS_NAME_FORMAT_FQDN_1779: {
		info1->result_name	= ldb_dn_alloc_linearized(mem_ctx, result->dn);
		W_ERROR_HAVE_NO_MEMORY(info1->result_name);

		info1->status		= DRSUAPI_DS_NAME_STATUS_OK;
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL: {
		info1->result_name	= samdb_result_string(result, "canonicalName", NULL);
		info1->status		= DRSUAPI_DS_NAME_STATUS_OK;
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX: {
		/* Not in the virtual ldb attribute */
		return DsCrackNameOneSyntactical(mem_ctx, 
						 DRSUAPI_DS_NAME_FORMAT_FQDN_1779, 
						 DRSUAPI_DS_NAME_FORMAT_CANONICAL_EX,
						 result->dn, name, info1);
	}
	case DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT: {

		const struct dom_sid *sid = samdb_result_dom_sid(mem_ctx, result, "objectSid");
		const char *_acc = "", *_dom = "";
		
		if (samdb_find_attribute(sam_ctx, result, "objectClass", "domain")) {

			ldb_ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &domain_res, 
						     partitions_basedn,
						     LDB_SCOPE_ONELEVEL,
						     domain_attrs,
						     "(ncName=%s)", ldb_dn_get_linearized(result->dn));
			
			if (ldb_ret != LDB_SUCCESS) {
				DEBUG(2, ("DsCrackNameOneFilter domain ref search failed: %s", ldb_errstring(sam_ctx)));
				info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
				return WERR_OK;
			}
			
			switch (domain_res->count) {
			case 1:
				break;
			case 0:
				info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
				return WERR_OK;
			default:
				info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
				return WERR_OK;
			}
			_dom = samdb_result_string(domain_res->msgs[0], "nETBIOSName", NULL);
			W_ERROR_HAVE_NO_MEMORY(_dom);
		} else {
			_acc = samdb_result_string(result, "sAMAccountName", NULL);
			if (!_acc) {
				info1->status = DRSUAPI_DS_NAME_STATUS_NO_MAPPING;
				return WERR_OK;
			}
			if (dom_sid_in_domain(dom_sid_parse_talloc(mem_ctx, SID_BUILTIN), sid)) {
				_dom = "BUILTIN";
			} else {
				const char *attrs[] = { NULL };
				struct ldb_result *domain_res2;
				struct dom_sid *dom_sid = dom_sid_dup(mem_ctx, sid);
				if (!dom_sid) {
					return WERR_OK;
				}
				dom_sid->num_auths--;
				ldb_ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &domain_res, 
							     NULL,
							     LDB_SCOPE_BASE,
							     attrs,
							     "(&(objectSid=%s)(objectClass=domain))", 
							     ldap_encode_ndr_dom_sid(mem_ctx, dom_sid));
				
				if (ldb_ret != LDB_SUCCESS) {
					DEBUG(2, ("DsCrackNameOneFilter domain search failed: %s", ldb_errstring(sam_ctx)));
					info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
					return WERR_OK;
				}
				
				switch (domain_res->count) {
				case 1:
					break;
				case 0:
					info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
					return WERR_OK;
				default:
					info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
					return WERR_OK;
				}

				ldb_ret = ldb_search_exp_fmt(sam_ctx, mem_ctx, &domain_res2, 
							     partitions_basedn,
							     LDB_SCOPE_ONELEVEL,
							     domain_attrs,
							     "(ncName=%s)", ldb_dn_get_linearized(domain_res->msgs[0]->dn));
				
				if (ldb_ret != LDB_SUCCESS) {
					DEBUG(2, ("DsCrackNameOneFilter domain ref search failed: %s", ldb_errstring(sam_ctx)));
					info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
					return WERR_OK;
				}
				
				switch (domain_res2->count) {
				case 1:
					break;
				case 0:
					info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
					return WERR_OK;
				default:
					info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
					return WERR_OK;
				}
				_dom = samdb_result_string(domain_res2->msgs[0], "nETBIOSName", NULL);
				W_ERROR_HAVE_NO_MEMORY(_dom);
			}
		}

		info1->result_name	= talloc_asprintf(mem_ctx, "%s\\%s", _dom, _acc);
		W_ERROR_HAVE_NO_MEMORY(info1->result_name);
		
		info1->status		= DRSUAPI_DS_NAME_STATUS_OK;
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_GUID: {
		struct GUID guid;
		
		guid = samdb_result_guid(result, "objectGUID");
		
		info1->result_name	= GUID_string2(mem_ctx, &guid);
		W_ERROR_HAVE_NO_MEMORY(info1->result_name);
		
		info1->status		= DRSUAPI_DS_NAME_STATUS_OK;
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_DISPLAY: {
		info1->result_name	= samdb_result_string(result, "displayName", NULL);
		if (!info1->result_name) {
			info1->result_name	= samdb_result_string(result, "sAMAccountName", NULL);
		} 
		if (!info1->result_name) {
			info1->status = DRSUAPI_DS_NAME_STATUS_NOT_FOUND;
		} else {
			info1->status = DRSUAPI_DS_NAME_STATUS_OK;
		}
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_SERVICE_PRINCIPAL: {
		info1->status = DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE;
		return WERR_OK;
	}
	case DRSUAPI_DS_NAME_FORMAT_DNS_DOMAIN:	
	case DRSUAPI_DS_NAME_FORMAT_SID_OR_SID_HISTORY: {
		info1->status = DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR;
		return WERR_OK;
	}
	default:
		info1->status = DRSUAPI_DS_NAME_STATUS_NO_MAPPING;
		return WERR_OK;
	}
}

/* Given a user Principal Name (such as foo@bar.com),
 * return the user and domain DNs.  This is used in the KDC to then
 * return the Keys and evaluate policy */

NTSTATUS crack_user_principal_name(struct ldb_context *sam_ctx, 
				   TALLOC_CTX *mem_ctx, 
				   const char *user_principal_name, 
				   struct ldb_dn **user_dn,
				   struct ldb_dn **domain_dn) 
{
	WERROR werr;
	struct drsuapi_DsNameInfo1 info1;
	werr = DsCrackNameOneName(sam_ctx, mem_ctx, 0,
				  DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL,
				  DRSUAPI_DS_NAME_FORMAT_FQDN_1779, 
				  user_principal_name,
				  &info1);
	if (!W_ERROR_IS_OK(werr)) {
		return werror_to_ntstatus(werr);
	}
	switch (info1.status) {
	case DRSUAPI_DS_NAME_STATUS_OK:
		break;
	case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
	case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
	case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
		return NT_STATUS_NO_SUCH_USER;
	case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
	default:
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	*user_dn = ldb_dn_new(mem_ctx, sam_ctx, info1.result_name);
	
	if (domain_dn) {
		werr = DsCrackNameOneName(sam_ctx, mem_ctx, 0,
					  DRSUAPI_DS_NAME_FORMAT_CANONICAL,
					  DRSUAPI_DS_NAME_FORMAT_FQDN_1779, 
					  talloc_asprintf(mem_ctx, "%s/", 
							  info1.dns_domain_name),
					  &info1);
		if (!W_ERROR_IS_OK(werr)) {
			return werror_to_ntstatus(werr);
		}
		switch (info1.status) {
		case DRSUAPI_DS_NAME_STATUS_OK:
			break;
		case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
		case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
		case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
			return NT_STATUS_NO_SUCH_USER;
		case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
		default:
			return NT_STATUS_UNSUCCESSFUL;
		}
		
		*domain_dn = ldb_dn_new(mem_ctx, sam_ctx, info1.result_name);
	}

	return NT_STATUS_OK;
	
}

/* Given a Service Principal Name (such as host/foo.bar.com@BAR.COM),
 * return the user and domain DNs.  This is used in the KDC to then
 * return the Keys and evaluate policy */

NTSTATUS crack_service_principal_name(struct ldb_context *sam_ctx, 
				      TALLOC_CTX *mem_ctx, 
				      const char *service_principal_name, 
				      struct ldb_dn **user_dn,
				      struct ldb_dn **domain_dn) 
{
	WERROR werr;
	struct drsuapi_DsNameInfo1 info1;
	werr = DsCrackNameOneName(sam_ctx, mem_ctx, 0,
				  DRSUAPI_DS_NAME_FORMAT_SERVICE_PRINCIPAL,
				  DRSUAPI_DS_NAME_FORMAT_FQDN_1779, 
				  service_principal_name,
				  &info1);
	if (!W_ERROR_IS_OK(werr)) {
		return werror_to_ntstatus(werr);
	}
	switch (info1.status) {
	case DRSUAPI_DS_NAME_STATUS_OK:
		break;
	case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
	case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
	case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
		return NT_STATUS_NO_SUCH_USER;
	case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
	default:
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	*user_dn = ldb_dn_new(mem_ctx, sam_ctx, info1.result_name);
	
	if (domain_dn) {
		werr = DsCrackNameOneName(sam_ctx, mem_ctx, 0,
					  DRSUAPI_DS_NAME_FORMAT_CANONICAL,
					  DRSUAPI_DS_NAME_FORMAT_FQDN_1779, 
					  talloc_asprintf(mem_ctx, "%s/", 
							  info1.dns_domain_name),
					  &info1);
		if (!W_ERROR_IS_OK(werr)) {
			return werror_to_ntstatus(werr);
		}
		switch (info1.status) {
		case DRSUAPI_DS_NAME_STATUS_OK:
			break;
		case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
		case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
		case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
			return NT_STATUS_NO_SUCH_USER;
		case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
		default:
			return NT_STATUS_UNSUCCESSFUL;
		}
		
		*domain_dn = ldb_dn_new(mem_ctx, sam_ctx, info1.result_name);
	}

	return NT_STATUS_OK;
	
}

NTSTATUS crack_name_to_nt4_name(TALLOC_CTX *mem_ctx, 
				struct event_context *ev_ctx, 
				struct loadparm_context *lp_ctx,
				uint32_t format_offered,
				const char *name, 
				const char **nt4_domain, const char **nt4_account)
{
	WERROR werr;
	struct drsuapi_DsNameInfo1 info1;
	struct ldb_context *ldb;
	char *p;

	/* Handle anonymous bind */
	if (!name || !*name) {
		*nt4_domain = "";
		*nt4_account = "";
		return NT_STATUS_OK;
	}

	ldb = samdb_connect(mem_ctx, ev_ctx, lp_ctx, system_session(mem_ctx, lp_ctx));
	if (ldb == NULL) {
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	werr = DsCrackNameOneName(ldb, mem_ctx, 0,
				  format_offered, 
				  DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT,
				  name,
				  &info1);
	if (!W_ERROR_IS_OK(werr)) {
		return werror_to_ntstatus(werr);
	}
	switch (info1.status) {
	case DRSUAPI_DS_NAME_STATUS_OK:
		break;
	case DRSUAPI_DS_NAME_STATUS_NOT_FOUND:
	case DRSUAPI_DS_NAME_STATUS_DOMAIN_ONLY:
	case DRSUAPI_DS_NAME_STATUS_NOT_UNIQUE:
		return NT_STATUS_NO_SUCH_USER;
	case DRSUAPI_DS_NAME_STATUS_RESOLVE_ERROR:
	default:
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	*nt4_domain = talloc_strdup(mem_ctx, info1.result_name);
	
	p = strchr(*nt4_domain, '\\');
	if (!p) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	p[0] = '\0';
	
	if (p[1]) {
		*nt4_account = talloc_strdup(mem_ctx, &p[1]);
	}

	if (!*nt4_account || !*nt4_domain) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

NTSTATUS crack_auto_name_to_nt4_name(TALLOC_CTX *mem_ctx,
				     struct event_context *ev_ctx, 
				     struct loadparm_context *lp_ctx,
				     const char *name,
				     const char **nt4_domain,
				     const char **nt4_account)
{
	uint32_t format_offered = DRSUAPI_DS_NAME_FORMAT_UKNOWN;

	/* Handle anonymous bind */
	if (!name || !*name) {
		*nt4_domain = "";
		*nt4_account = "";
		return NT_STATUS_OK;
	}

	if (strchr_m(name, '=')) {
		format_offered = DRSUAPI_DS_NAME_FORMAT_FQDN_1779;
	} else if (strchr_m(name, '@')) {
		format_offered = DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL;
	} else if (strchr_m(name, '\\')) {
		format_offered = DRSUAPI_DS_NAME_FORMAT_NT4_ACCOUNT;
	} else if (strchr_m(name, '/')) {
		format_offered = DRSUAPI_DS_NAME_FORMAT_CANONICAL;
	}

	return crack_name_to_nt4_name(mem_ctx, ev_ctx, lp_ctx, format_offered, name, nt4_domain, nt4_account);
}
