FreeRDP/winpr/libwinpr/sspi/NTLM/ntlm_av_pairs.c

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/**
* WinPR: Windows Portable Runtime
* NTLM Security Package (AV_PAIRs)
*
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* 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>
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#include "ntlm_compute.h"
#include "ntlm_av_pairs.h"
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#include "../../log.h"
#define TAG WINPR_TAG("sspi.NTLM")
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const char* const AV_PAIR_STRINGS[] =
{
"MsvAvEOL",
"MsvAvNbComputerName",
"MsvAvNbDomainName",
"MsvAvDnsComputerName",
"MsvAvDnsDomainName",
"MsvAvDnsTreeName",
"MsvAvFlags",
"MsvAvTimestamp",
"MsvAvRestrictions",
"MsvAvTargetName",
"MsvChannelBindings"
};
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void ntlm_av_pair_list_init(NTLM_AV_PAIR* pAvPairList)
{
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NTLM_AV_PAIR* pAvPair = pAvPairList;
ntlm_av_pair_set_id(pAvPair, MsvAvEOL);
ntlm_av_pair_set_len(pAvPair, 0);
}
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ULONG ntlm_av_pair_list_length(NTLM_AV_PAIR* pAvPairList)
{
ULONG length;
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NTLM_AV_PAIR* pAvPair = pAvPairList;
if (!pAvPair)
return 0;
while (ntlm_av_pair_get_id(pAvPair) != MsvAvEOL)
{
pAvPair = ntlm_av_pair_get_next_pointer(pAvPair);
}
length = (pAvPair - pAvPairList) + sizeof(NTLM_AV_PAIR);
return length;
}
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void ntlm_print_av_pair_list(NTLM_AV_PAIR* pAvPairList)
{
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NTLM_AV_PAIR* pAvPair = pAvPairList;
if (!pAvPair)
return;
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WLog_INFO(TAG, "AV_PAIRs =");
while (ntlm_av_pair_get_id(pAvPair) != MsvAvEOL)
{
WLog_INFO(TAG, "\t%s AvId: %"PRIu16" AvLen: %"PRIu16"",
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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),
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ntlm_av_pair_get_len(pAvPair));
pAvPair = ntlm_av_pair_get_next_pointer(pAvPair);
}
}
ULONG ntlm_av_pair_list_size(ULONG AvPairsCount, ULONG AvPairsValueLength)
{
/* size of headers + value lengths + terminating MsvAvEOL AV_PAIR */
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return ((AvPairsCount + 1) * 4) + AvPairsValueLength;
}
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PBYTE ntlm_av_pair_get_value_pointer(NTLM_AV_PAIR* pAvPair)
{
return &((PBYTE) pAvPair)[sizeof(NTLM_AV_PAIR)];
}
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int ntlm_av_pair_get_next_offset(NTLM_AV_PAIR* pAvPair)
{
return ntlm_av_pair_get_len(pAvPair) + sizeof(NTLM_AV_PAIR);
}
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NTLM_AV_PAIR* ntlm_av_pair_get_next_pointer(NTLM_AV_PAIR* pAvPair)
{
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return (NTLM_AV_PAIR*)((PBYTE) pAvPair + ntlm_av_pair_get_next_offset(pAvPair));
}
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NTLM_AV_PAIR* ntlm_av_pair_get(NTLM_AV_PAIR* pAvPairList, NTLM_AV_ID AvId)
{
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NTLM_AV_PAIR* pAvPair = pAvPairList;
if (!pAvPair)
return NULL;
while (1)
{
if (ntlm_av_pair_get_id(pAvPair) == AvId)
return pAvPair;
if (ntlm_av_pair_get_id(pAvPair) == MsvAvEOL)
return NULL;
pAvPair = ntlm_av_pair_get_next_pointer(pAvPair);
}
return NULL;
}
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NTLM_AV_PAIR* ntlm_av_pair_add(NTLM_AV_PAIR* pAvPairList, NTLM_AV_ID AvId, PBYTE Value,
UINT16 AvLen)
{
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NTLM_AV_PAIR* pAvPair;
pAvPair = ntlm_av_pair_get(pAvPairList, MsvAvEOL);
if (!pAvPair)
return NULL;
assert(Value != NULL);
ntlm_av_pair_set_id(pAvPair, AvId);
ntlm_av_pair_set_len(pAvPair, AvLen);
CopyMemory(ntlm_av_pair_get_value_pointer(pAvPair), Value, AvLen);
return pAvPair;
}
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NTLM_AV_PAIR* ntlm_av_pair_add_copy(NTLM_AV_PAIR* pAvPairList, NTLM_AV_PAIR* pAvPair)
{
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NTLM_AV_PAIR* pAvPairCopy;
pAvPairCopy = ntlm_av_pair_get(pAvPairList, MsvAvEOL);
if (!pAvPairCopy)
return NULL;
CopyMemory(&pAvPairCopy->AvId, &pAvPair->AvId, 2);
CopyMemory(&pAvPairCopy->AvLen, &pAvPair->AvLen, 2);
CopyMemory(ntlm_av_pair_get_value_pointer(pAvPairCopy),
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ntlm_av_pair_get_value_pointer(pAvPair),
ntlm_av_pair_get_len(pAvPair));
return pAvPairCopy;
}
int ntlm_get_target_computer_name(PUNICODE_STRING pName, COMPUTER_NAME_FORMAT type)
{
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char* name;
int status;
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DWORD nSize = 0;
CHAR* computerName;
if (GetComputerNameExA(ComputerNameNetBIOS, NULL, &nSize) || (GetLastError() != ERROR_MORE_DATA) ||
(nSize < 2))
return -1;
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computerName = calloc(nSize, sizeof(CHAR));
if (!computerName)
return -1;
if (!GetComputerNameExA(ComputerNameNetBIOS, computerName, &nSize))
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{
free(computerName);
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return -1;
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}
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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;
}
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pName->Length = (USHORT)((status - 1) * 2);
pName->MaximumLength = pName->Length;
free(name);
return 1;
}
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void ntlm_free_unicode_string(PUNICODE_STRING string)
{
if (string)
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{
if (string->Length > 0)
{
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free(string->Buffer);
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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);
}
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void ntlm_compute_channel_bindings(NTLM_CONTEXT* context)
{
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WINPR_DIGEST_CTX* md5;
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BYTE* ChannelBindingToken;
UINT32 ChannelBindingTokenLength;
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SEC_CHANNEL_BINDINGS* ChannelBindings;
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ZeroMemory(context->ChannelBindingsHash, WINPR_MD5_DIGEST_LENGTH);
ChannelBindings = context->Bindings.Bindings;
if (!ChannelBindings)
return;
if (!(md5 = winpr_Digest_New()))
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return;
if (!winpr_Digest_Init(md5, WINPR_MD_MD5))
goto out;
ChannelBindingTokenLength = context->Bindings.BindingsLength - sizeof(SEC_CHANNEL_BINDINGS);
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ChannelBindingToken = &((BYTE*) ChannelBindings)[ChannelBindings->dwApplicationDataOffset];
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if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->dwInitiatorAddrType))
goto out;
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if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbInitiatorLength))
goto out;
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if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->dwAcceptorAddrType))
goto out;
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if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbAcceptorLength))
goto out;
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if (!ntlm_md5_update_uint32_be(md5, ChannelBindings->cbApplicationDataLength))
goto out;
if (!winpr_Digest_Update(md5, (void*) ChannelBindingToken, ChannelBindingTokenLength))
goto out;
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if (!winpr_Digest_Final(md5, context->ChannelBindingsHash, WINPR_MD5_DIGEST_LENGTH))
goto out;
out:
winpr_Digest_Free(md5);
}
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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);
}
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int ntlm_construct_challenge_target_info(NTLM_CONTEXT* context)
{
int length;
ULONG AvPairsCount;
ULONG AvPairsLength;
LONG AvPairListSize;
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NTLM_AV_PAIR* pAvPairList;
UNICODE_STRING NbDomainName;
UNICODE_STRING NbComputerName;
UNICODE_STRING DnsDomainName;
UNICODE_STRING DnsComputerName;
NbDomainName.Buffer = NULL;
if (ntlm_get_target_computer_name(&NbDomainName, ComputerNameNetBIOS) < 0)
return -1;
NbComputerName.Buffer = NULL;
if (ntlm_get_target_computer_name(&NbComputerName, ComputerNameNetBIOS) < 0)
return -1;
DnsDomainName.Buffer = NULL;
if (ntlm_get_target_computer_name(&DnsDomainName, ComputerNameDnsDomain) < 0)
return -1;
DnsComputerName.Buffer = NULL;
if (ntlm_get_target_computer_name(&DnsComputerName, ComputerNameDnsHostname) < 0)
return -1;
AvPairsCount = 5;
AvPairsLength = NbDomainName.Length + NbComputerName.Length +
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DnsDomainName.Length + DnsComputerName.Length + 8;
length = ntlm_av_pair_list_size(AvPairsCount, AvPairsLength);
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if (!sspi_SecBufferAlloc(&context->ChallengeTargetInfo, length))
return -1;
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pAvPairList = (NTLM_AV_PAIR*) context->ChallengeTargetInfo.pvBuffer;
AvPairListSize = (ULONG) context->ChallengeTargetInfo.cbBuffer;
ntlm_av_pair_list_init(pAvPairList);
ntlm_av_pair_add(pAvPairList, MsvAvNbDomainName, (PBYTE) NbDomainName.Buffer, NbDomainName.Length);
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ntlm_av_pair_add(pAvPairList, MsvAvNbComputerName, (PBYTE) NbComputerName.Buffer,
NbComputerName.Length);
ntlm_av_pair_add(pAvPairList, MsvAvDnsDomainName, (PBYTE) DnsDomainName.Buffer,
DnsDomainName.Length);
ntlm_av_pair_add(pAvPairList, MsvAvDnsComputerName, (PBYTE) DnsComputerName.Buffer,
DnsComputerName.Length);
ntlm_av_pair_add(pAvPairList, MsvAvTimestamp, context->Timestamp, sizeof(context->Timestamp));
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ntlm_free_unicode_string(&NbDomainName);
ntlm_free_unicode_string(&NbComputerName);
ntlm_free_unicode_string(&DnsDomainName);
ntlm_free_unicode_string(&DnsComputerName);
return 1;
}
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int ntlm_construct_authenticate_target_info(NTLM_CONTEXT* context)
{
ULONG size;
ULONG AvPairsCount;
ULONG AvPairsValueLength;
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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;
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AvPairsCount = 1;
AvPairsValueLength = 0;
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ChallengeTargetInfo = (NTLM_AV_PAIR*) context->ChallengeTargetInfo.pvBuffer;
AvNbDomainName = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvNbDomainName);
AvNbComputerName = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvNbComputerName);
AvDnsDomainName = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvDnsDomainName);
AvDnsComputerName = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvDnsComputerName);
AvDnsTreeName = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvDnsTreeName);
AvTimestamp = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvTimestamp);
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;
}
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/**
* Extended Protection for Authentication:
* http://blogs.technet.com/b/srd/archive/2009/12/08/extended-protection-for-authentication.aspx
*/
if (!context->SuppressExtendedProtection)
{
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/**
* 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;
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AuthenticateTargetInfo = (NTLM_AV_PAIR*) context->AuthenticateTargetInfo.pvBuffer;
ntlm_av_pair_list_init(AuthenticateTargetInfo);
if (AvNbDomainName)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvNbDomainName);
if (AvNbComputerName)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvNbComputerName);
if (AvDnsDomainName)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvDnsDomainName);
if (AvDnsComputerName)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvDnsComputerName);
if (AvDnsTreeName)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvDnsTreeName);
if (AvTimestamp)
ntlm_av_pair_add_copy(AuthenticateTargetInfo, AvTimestamp);
if (context->UseMIC)
{
UINT32 flags;
Data_Write_UINT32(&flags, MSV_AV_FLAGS_MESSAGE_INTEGRITY_CHECK);
ntlm_av_pair_add(AuthenticateTargetInfo, MsvAvFlags, (PBYTE) &flags, 4);
}
if (context->SendSingleHostData)
{
ntlm_av_pair_add(AuthenticateTargetInfo, MsvAvSingleHost,
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(PBYTE) &context->SingleHostData, context->SingleHostData.Size);
}
if (!context->SuppressExtendedProtection)
{
ntlm_av_pair_add(AuthenticateTargetInfo, MsvChannelBindings, context->ChannelBindingsHash, 16);
if (context->ServicePrincipalName.Length > 0)
{
ntlm_av_pair_add(AuthenticateTargetInfo, MsvAvTargetName,
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(PBYTE) context->ServicePrincipalName.Buffer,
context->ServicePrincipalName.Length);
}
}
if (context->NTLMv2)
{
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NTLM_AV_PAIR* AvEOL;
AvEOL = ntlm_av_pair_get(ChallengeTargetInfo, MsvAvEOL);
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ZeroMemory((void*) AvEOL, 4);
}
return 1;
}