/**

 * WinPR: Windows Portable Runtime

 * NTLM Security Package (AV_PAIRs)

 *

 * Copyright 2011-2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <assert.h>

#include "ntlm.h"

#include "../sspi.h"

#include <winpr/crt.h>

#include <winpr/print.h>

#include <winpr/sysinfo.h>

#include <winpr/tchar.h>

#include <winpr/crypto.h>

#include "ntlm_compute.h"

#include "ntlm_av_pairs.h"

#include "../../log.h"

#define TAG WINPR_TAG("sspi.NTLM")

static const char* const AV_PAIR_STRINGS[] = {

	"MsvAvEOL",           "MsvAvNbComputerName", "MsvAvNbDomainName", "MsvAvDnsComputerName",

	"MsvAvDnsDomainName", "MsvAvDnsTreeName",    "MsvAvFlags",        "MsvAvTimestamp",

	"MsvAvRestrictions",  "MsvAvTargetName",     "MsvChannelBindings"

};

static BOOL ntlm_av_pair_check(NTLM_AV_PAIR* pAvPair, size_t cbAvPair);

static NTLM_AV_PAIR* ntlm_av_pair_next(NTLM_AV_PAIR* pAvPairList, size_t* pcbAvPairList);

static INLINE void ntlm_av_pair_set_id(NTLM_AV_PAIR* pAvPair, UINT16 id)

{

	Data_Write_UINT16(&pAvPair->AvId, id);

}

static INLINE void ntlm_av_pair_set_len(NTLM_AV_PAIR* pAvPair, UINT16 len)

{

	Data_Write_UINT16(&pAvPair->AvLen, len);

}

static BOOL ntlm_av_pair_list_init(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList)

{

	NTLM_AV_PAIR* pAvPair = pAvPairList;

	if (!pAvPair || (cbAvPairList < sizeof(NTLM_AV_PAIR)))

		return FALSE;

	ntlm_av_pair_set_id(pAvPair, MsvAvEOL);

	ntlm_av_pair_set_len(pAvPair, 0);

	return TRUE;

}

static INLINE UINT16 ntlm_av_pair_get_id(const NTLM_AV_PAIR* pAvPair)

{

	UINT16 AvId;

	Data_Read_UINT16(&pAvPair->AvId, AvId);

	return AvId;

}

ULONG ntlm_av_pair_list_length(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList)

{

	size_t cbAvPair;

	NTLM_AV_PAIR* pAvPair;

	pAvPair = ntlm_av_pair_get(pAvPairList, cbAvPairList, MsvAvEOL, &cbAvPair);

	if (!pAvPair)

		return 0;

	return ((PBYTE)pAvPair - (PBYTE)pAvPairList) + sizeof(NTLM_AV_PAIR);

}

static INLINE SIZE_T ntlm_av_pair_get_len(const NTLM_AV_PAIR* pAvPair)

{

	UINT16 AvLen;

	Data_Read_UINT16(&pAvPair->AvLen, AvLen);

	return AvLen;

}

void ntlm_print_av_pair_list(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList)

{

	size_t cbAvPair = cbAvPairList;

	NTLM_AV_PAIR* pAvPair = pAvPairList;

	if (!ntlm_av_pair_check(pAvPair, cbAvPair))

		return;

	WLog_INFO(TAG, "AV_PAIRs =");

	while (pAvPair && ntlm_av_pair_get_id(pAvPair) != MsvAvEOL)

	{

		WLog_INFO(TAG, "\t%s AvId: %" PRIu16 " AvLen: %" PRIu16 "",

		          AV_PAIR_STRINGS[ntlm_av_pair_get_id(pAvPair)], ntlm_av_pair_get_id(pAvPair),

		          ntlm_av_pair_get_len(pAvPair));

		winpr_HexDump(TAG, WLOG_INFO, ntlm_av_pair_get_value_pointer(pAvPair),

		              ntlm_av_pair_get_len(pAvPair));

		pAvPair = ntlm_av_pair_next(pAvPair, &cbAvPair);

	}

}

static ULONG ntlm_av_pair_list_size(ULONG AvPairsCount, ULONG AvPairsValueLength)

{

	/* size of headers + value lengths + terminating MsvAvEOL AV_PAIR */

	return ((AvPairsCount + 1) * 4) + AvPairsValueLength;

}

PBYTE ntlm_av_pair_get_value_pointer(NTLM_AV_PAIR* pAvPair)

{

	return (PBYTE)pAvPair + sizeof(NTLM_AV_PAIR);

}

static size_t ntlm_av_pair_get_next_offset(NTLM_AV_PAIR* pAvPair)

{

	return ntlm_av_pair_get_len(pAvPair) + sizeof(NTLM_AV_PAIR);

}

static BOOL ntlm_av_pair_check(NTLM_AV_PAIR* pAvPair, size_t cbAvPair)

{

	if (!pAvPair || cbAvPair < sizeof(NTLM_AV_PAIR))

		return FALSE;

	return cbAvPair >= ntlm_av_pair_get_next_offset(pAvPair);

}

static NTLM_AV_PAIR* ntlm_av_pair_next(NTLM_AV_PAIR* pAvPair, size_t* pcbAvPair)

{

	size_t offset;

	if (!pcbAvPair)

		return NULL;

	if (!ntlm_av_pair_check(pAvPair, *pcbAvPair))

		return NULL;

	offset = ntlm_av_pair_get_next_offset(pAvPair);

	*pcbAvPair -= offset;

	return (NTLM_AV_PAIR*)((PBYTE)pAvPair + offset);

}

NTLM_AV_PAIR* ntlm_av_pair_get(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList, NTLM_AV_ID AvId,

                               size_t* pcbAvPairListRemaining)

{

	size_t cbAvPair = cbAvPairList;

	NTLM_AV_PAIR* pAvPair = pAvPairList;

	if (!ntlm_av_pair_check(pAvPair, cbAvPair))

		pAvPair = NULL;

	while (pAvPair)

	{

		UINT16 id = ntlm_av_pair_get_id(pAvPair);

		if (id == AvId)

			break;

		if (id == MsvAvEOL)

		{

			pAvPair = NULL;

			break;

		}

		pAvPair = ntlm_av_pair_next(pAvPair, &cbAvPair);

	}

	if (!pAvPair)

		cbAvPair = 0;

	if (pcbAvPairListRemaining)

		*pcbAvPairListRemaining = cbAvPair;

	return pAvPair;

}

static BOOL ntlm_av_pair_add(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList, NTLM_AV_ID AvId,

                             PBYTE Value, UINT16 AvLen)

{

	size_t cbAvPair;

	NTLM_AV_PAIR* pAvPair;

	pAvPair = ntlm_av_pair_get(pAvPairList, cbAvPairList, MsvAvEOL, &cbAvPair);

	/* size of header + value length + terminating MsvAvEOL AV_PAIR */

	if (!pAvPair || cbAvPair < 2 * sizeof(NTLM_AV_PAIR) + AvLen)

		return FALSE;

	ntlm_av_pair_set_id(pAvPair, AvId);

	ntlm_av_pair_set_len(pAvPair, AvLen);

	if (AvLen)

	{

		assert(Value != NULL);

		CopyMemory(ntlm_av_pair_get_value_pointer(pAvPair), Value, AvLen);

	}

	pAvPair = ntlm_av_pair_next(pAvPair, &cbAvPair);

	return ntlm_av_pair_list_init(pAvPair, cbAvPair);

}

static BOOL ntlm_av_pair_add_copy(NTLM_AV_PAIR* pAvPairList, size_t cbAvPairList,

                                  NTLM_AV_PAIR* pAvPair, size_t cbAvPair)

{

	if (!ntlm_av_pair_check(pAvPair, cbAvPair))

		return FALSE;

	return ntlm_av_pair_add(pAvPairList, cbAvPairList, ntlm_av_pair_get_id(pAvPair),

	                        ntlm_av_pair_get_value_pointer(pAvPair), ntlm_av_pair_get_len(pAvPair));

}

static int ntlm_get_target_computer_name(PUNICODE_STRING pName, COMPUTER_NAME_FORMAT type)

{

	char* name;

	int status;

	DWORD nSize = 0;

	CHAR* computerName;

	if (GetComputerNameExA(ComputerNameNetBIOS, NULL, &nSize) || GetLastError() != ERROR_MORE_DATA)

		return -1;

	computerName = calloc(nSize, sizeof(CHAR));

	if (!computerName)

		return -1;

	if (!GetComputerNameExA(ComputerNameNetBIOS, computerName, &nSize))

	{

		free(computerName);

		return -1;

	}

	if (nSize > MAX_COMPUTERNAME_LENGTH)

		computerName[MAX_COMPUTERNAME_LENGTH] = '\0';

	name = computerName;

	if (!name)

		return -1;

	if (type == ComputerNameNetBIOS)

		CharUpperA(name);

	status = ConvertToUnicode(CP_UTF8, 0, name, -1, &pName->Buffer, 0);

	if (status <= 0)

	{

		free(name);

		return status;

	}

	pName->Length = (USHORT)((status - 1) * 2);

	pName->MaximumLength = pName->Length;

	free(name);

	return 1;

}

static void ntlm_free_unicode_string(PUNICODE_STRING string)

{

	if (string)

	{

		if (string->Length > 0)

		{

			free(string->Buffer);

			string->Buffer = NULL;

			string->Length = 0;

			string->MaximumLength = 0;

		}

	}

}

/**

 * From http://www.ietf.org/proceedings/72/slides/sasl-2.pdf:

 *

 * tls-server-end-point:

 *

 * The hash of the TLS server's end entity certificate as it appears, octet for octet,

 * in the server's Certificate message (note that the Certificate message contains a

 * certificate_list, the first element of which is the server's end entity certificate.)

 * The hash function to be selected is as follows: if the certificate's signature hash

 * algorithm is either MD5 or SHA-1, then use SHA-256, otherwise use the certificate's

 * signature hash algorithm.

 */

/**

 * Channel Bindings sample usage:

 * https://raw.github.com/mozilla/mozilla-central/master/extensions/auth/nsAuthSSPI.cpp

 */

/*

typedef struct gss_channel_bindings_struct {

    OM_uint32 initiator_addrtype;

    gss_buffer_desc initiator_address;

    OM_uint32 acceptor_addrtype;

    gss_buffer_desc acceptor_address;

    gss_buffer_desc application_data;

} *gss_channel_bindings_t;

 */

static BOOL ntlm_md5_update_uint32_be(WINPR_DIGEST_CTX* md5, UINT32 num)

{

	BYTE be32[4];

	be32[0] = (num >> 0) & 0xFF;

	be32[1] = (num >> 8) & 0xFF;

	be32[2] = (num >> 16) & 0xFF;

	be32[3] = (num >> 24) & 0xFF;

	return winpr_Digest_Update(md5, be32, 4);

}

static void ntlm_compute_channel_bindings(NTLM_CONTEXT* context)

{

	WINPR_DIGEST_CTX* md5;

	BYTE* ChannelBindingToken;

	UINT32 ChannelBindingTokenLength;

	SEC_CHANNEL_BINDINGS* ChannelBindings;

	ZeroMemory(context->ChannelBindingsHash, WINPR_MD5_DIGEST_LENGTH);

	ChannelBindings = context->Bindings.Bindings;

	if (!ChannelBindings)

		return;

	if (!(md5 = winpr_Digest_New()))

		return;

	if (!winpr_Digest_Init(md5, WINPR_MD_MD5))

		goto out;

	ChannelBindingTokenLength = context->Bindings.BindingsLength - sizeof(SEC_CHANNEL_BINDINGS);

	ChannelBindingToken = &((BYTE*)ChannelBindings)[ChannelBindings->dwApplicationDataOffset];

	if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->dwInitiatorAddrType))

		goto out;

	if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbInitiatorLength))

		goto out;

	if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->dwAcceptorAddrType))

		goto out;

	if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbAcceptorLength))

		goto out;

	if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbApplicationDataLength))

		goto out;

	if (!winpr_Digest_Update(md5, (void*)ChannelBindingToken, ChannelBindingTokenLength))

		goto out;

	if (!winpr_Digest_Final(md5, context->ChannelBindingsHash, WINPR_MD5_DIGEST_LENGTH))

		goto out;

out:

	winpr_Digest_Free(md5);

}

static void ntlm_compute_single_host_data(NTLM_CONTEXT* context)

{

	/**

	 * The Single_Host_Data structure allows a client to send machine-specific information

	 * within an authentication exchange to services on the same machine. The client can

	 * produce additional information to be processed in an implementation-specific way when

	 * the client and server are on the same host. If the server and client platforms are

	 * different or if they are on different hosts, then the information MUST be ignored.

	 * Any fields after the MachineID field MUST be ignored on receipt.

	 */

	Data_Write_UINT32(&context->SingleHostData.Size, 48);

	Data_Write_UINT32(&context->SingleHostData.Z4, 0);

	Data_Write_UINT32(&context->SingleHostData.DataPresent, 1);

	Data_Write_UINT32(&context->SingleHostData.CustomData, SECURITY_MANDATORY_MEDIUM_RID);

	FillMemory(context->SingleHostData.MachineID, 32, 0xAA);

}

int ntlm_construct_challenge_target_info(NTLM_CONTEXT* context)

{

	int rc = -1;

	int length;

	ULONG AvPairsCount;

	ULONG AvPairsLength;

	NTLM_AV_PAIR* pAvPairList;

	size_t cbAvPairList;

	UNICODE_STRING NbDomainName = { 0 };

	UNICODE_STRING NbComputerName = { 0 };

	UNICODE_STRING DnsDomainName = { 0 };

	UNICODE_STRING DnsComputerName = { 0 };

	if (ntlm_get_target_computer_name(&NbDomainName, ComputerNameNetBIOS) < 0)

		goto fail;

	NbComputerName.Buffer = NULL;

	if (ntlm_get_target_computer_name(&NbComputerName, ComputerNameNetBIOS) < 0)

		goto fail;

	DnsDomainName.Buffer = NULL;

	if (ntlm_get_target_computer_name(&DnsDomainName, ComputerNameDnsDomain) < 0)

		goto fail;

	DnsComputerName.Buffer = NULL;

	if (ntlm_get_target_computer_name(&DnsComputerName, ComputerNameDnsHostname) < 0)

		goto fail;

	AvPairsCount = 5;

	AvPairsLength = NbDomainName.Length + NbComputerName.Length + DnsDomainName.Length +

	                DnsComputerName.Length + 8;

	length = ntlm_av_pair_list_size(AvPairsCount, AvPairsLength);

	if (!sspi_SecBufferAlloc(&context->ChallengeTargetInfo, length))

		goto fail;

	pAvPairList = (NTLM_AV_PAIR*)context->ChallengeTargetInfo.pvBuffer;

	cbAvPairList = context->ChallengeTargetInfo.cbBuffer;

	if (!ntlm_av_pair_list_init(pAvPairList, cbAvPairList))

		goto fail;

	if (!ntlm_av_pair_add(pAvPairList, cbAvPairList, MsvAvNbDomainName, (PBYTE)NbDomainName.Buffer,

	                      NbDomainName.Length))

		goto fail;

	if (!ntlm_av_pair_add(pAvPairList, cbAvPairList, MsvAvNbComputerName,

	                      (PBYTE)NbComputerName.Buffer, NbComputerName.Length))

		goto fail;

	if (!ntlm_av_pair_add(pAvPairList, cbAvPairList, MsvAvDnsDomainName,

	                      (PBYTE)DnsDomainName.Buffer, DnsDomainName.Length))

		goto fail;

	if (!ntlm_av_pair_add(pAvPairList, cbAvPairList, MsvAvDnsComputerName,

	                      (PBYTE)DnsComputerName.Buffer, DnsComputerName.Length))

		goto fail;

	if (!ntlm_av_pair_add(pAvPairList, cbAvPairList, MsvAvTimestamp, context->Timestamp,

	                      sizeof(context->Timestamp)))

		goto fail;

	rc = 1;

fail:

	ntlm_free_unicode_string(&NbDomainName);

	ntlm_free_unicode_string(&NbComputerName);

	ntlm_free_unicode_string(&DnsDomainName);

	ntlm_free_unicode_string(&DnsComputerName);

	return rc;

}

int ntlm_construct_authenticate_target_info(NTLM_CONTEXT* context)

{

	ULONG size;

	ULONG AvPairsCount;

	ULONG AvPairsValueLength;

	NTLM_AV_PAIR* AvTimestamp;

	NTLM_AV_PAIR* AvNbDomainName;

	NTLM_AV_PAIR* AvNbComputerName;

	NTLM_AV_PAIR* AvDnsDomainName;

	NTLM_AV_PAIR* AvDnsComputerName;

	NTLM_AV_PAIR* AvDnsTreeName;

	NTLM_AV_PAIR* ChallengeTargetInfo;

	NTLM_AV_PAIR* AuthenticateTargetInfo;

	size_t cbAvTimestamp;

	size_t cbAvNbDomainName;

	size_t cbAvNbComputerName;

	size_t cbAvDnsDomainName;

	size_t cbAvDnsComputerName;

	size_t cbAvDnsTreeName;

	size_t cbChallengeTargetInfo;

	size_t cbAuthenticateTargetInfo;

	AvPairsCount = 1;

	AvPairsValueLength = 0;

	ChallengeTargetInfo = (NTLM_AV_PAIR*)context->ChallengeTargetInfo.pvBuffer;

	cbChallengeTargetInfo = context->ChallengeTargetInfo.cbBuffer;

	AvNbDomainName = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo, MsvAvNbDomainName,

	                                  &cbAvNbDomainName);

	AvNbComputerName = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo,

	                                    MsvAvNbComputerName, &cbAvNbComputerName);

	AvDnsDomainName = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo,

	                                   MsvAvDnsDomainName, &cbAvDnsDomainName);

	AvDnsComputerName = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo,

	                                     MsvAvDnsComputerName, &cbAvDnsComputerName);

	AvDnsTreeName = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo, MsvAvDnsTreeName,

	                                 &cbAvDnsTreeName);

	AvTimestamp = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo, MsvAvTimestamp,

	                               &cbAvTimestamp);

	if (AvNbDomainName)

	{

		AvPairsCount++; /* MsvAvNbDomainName */

		AvPairsValueLength += ntlm_av_pair_get_len(AvNbDomainName);

	}

	if (AvNbComputerName)

	{

		AvPairsCount++; /* MsvAvNbComputerName */

		AvPairsValueLength += ntlm_av_pair_get_len(AvNbComputerName);

	}

	if (AvDnsDomainName)

	{

		AvPairsCount++; /* MsvAvDnsDomainName */

		AvPairsValueLength += ntlm_av_pair_get_len(AvDnsDomainName);

	}

	if (AvDnsComputerName)

	{

		AvPairsCount++; /* MsvAvDnsComputerName */

		AvPairsValueLength += ntlm_av_pair_get_len(AvDnsComputerName);

	}

	if (AvDnsTreeName)

	{

		AvPairsCount++; /* MsvAvDnsTreeName */

		AvPairsValueLength += ntlm_av_pair_get_len(AvDnsTreeName);

	}

	AvPairsCount++; /* MsvAvTimestamp */

	AvPairsValueLength += 8;

	if (context->UseMIC)

	{

		AvPairsCount++; /* MsvAvFlags */

		AvPairsValueLength += 4;

	}

	if (context->SendSingleHostData)

	{

		AvPairsCount++; /* MsvAvSingleHost */

		ntlm_compute_single_host_data(context);

		AvPairsValueLength += context->SingleHostData.Size;

	}

	/**

	 * Extended Protection for Authentication:

	 * http://blogs.technet.com/b/srd/archive/2009/12/08/extended-protection-for-authentication.aspx

	 */

	if (!context->SuppressExtendedProtection)

	{

		/**

		 * SEC_CHANNEL_BINDINGS structure

		 * http://msdn.microsoft.com/en-us/library/windows/desktop/dd919963/

		 */

		AvPairsCount++; /* MsvChannelBindings */

		AvPairsValueLength += 16;

		ntlm_compute_channel_bindings(context);

		if (context->ServicePrincipalName.Length > 0)

		{

			AvPairsCount++; /* MsvAvTargetName */

			AvPairsValueLength += context->ServicePrincipalName.Length;

		}

	}

	size = ntlm_av_pair_list_size(AvPairsCount, AvPairsValueLength);

	if (context->NTLMv2)

		size += 8; /* unknown 8-byte padding */

	if (!sspi_SecBufferAlloc(&context->AuthenticateTargetInfo, size))

		return -1;

	AuthenticateTargetInfo = (NTLM_AV_PAIR*)context->AuthenticateTargetInfo.pvBuffer;

	cbAuthenticateTargetInfo = context->AuthenticateTargetInfo.cbBuffer;

	if (!ntlm_av_pair_list_init(AuthenticateTargetInfo, cbAuthenticateTargetInfo))

		return -1;

	if (AvNbDomainName)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo, AvNbDomainName,

		                           cbAvNbDomainName))

			return -1;

	}

	if (AvNbComputerName)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo,

		                           AvNbComputerName, cbAvNbComputerName))

			return -1;

	}

	if (AvDnsDomainName)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo,

		                           AvDnsDomainName, cbAvDnsDomainName))

			return -1;

	}

	if (AvDnsComputerName)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo,

		                           AvDnsComputerName, cbAvDnsComputerName))

			return -1;

	}

	if (AvDnsTreeName)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo, AvDnsTreeName,

		                           cbAvDnsTreeName))

			return -1;

	}

	if (AvTimestamp)

	{

		if (!ntlm_av_pair_add_copy(AuthenticateTargetInfo, cbAuthenticateTargetInfo, AvTimestamp,

		                           cbAvTimestamp))

			return -1;

	}

	if (context->UseMIC)

	{

		UINT32 flags;

		Data_Write_UINT32(&flags, MSV_AV_FLAGS_MESSAGE_INTEGRITY_CHECK);

		if (!ntlm_av_pair_add(AuthenticateTargetInfo, cbAuthenticateTargetInfo, MsvAvFlags,

		                      (PBYTE)&flags, 4))

			return -1;

	}

	if (context->SendSingleHostData)

	{

		if (!ntlm_av_pair_add(AuthenticateTargetInfo, cbAuthenticateTargetInfo, MsvAvSingleHost,

		                      (PBYTE)&context->SingleHostData, context->SingleHostData.Size))

			return -1;

	}

	if (!context->SuppressExtendedProtection)

	{

		if (!ntlm_av_pair_add(AuthenticateTargetInfo, cbAuthenticateTargetInfo, MsvChannelBindings,

		                      context->ChannelBindingsHash, 16))

			return -1;

		if (context->ServicePrincipalName.Length > 0)

		{

			if (!ntlm_av_pair_add(AuthenticateTargetInfo, cbAuthenticateTargetInfo, MsvAvTargetName,

			                      (PBYTE)context->ServicePrincipalName.Buffer,

			                      context->ServicePrincipalName.Length))

				return -1;

		}

	}

	if (context->NTLMv2)

	{

		NTLM_AV_PAIR* AvEOL;

		AvEOL = ntlm_av_pair_get(ChallengeTargetInfo, cbChallengeTargetInfo, MsvAvEOL, NULL);

		if (!AvEOL)

			return -1;

		ZeroMemory(AvEOL, sizeof(NTLM_AV_PAIR));

	}

	return 1;

}