/**
* WinPR: Windows Portable Runtime
* NTLM Security Package
*
* 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 <winpr/crt.h>
#include <winpr/sspi.h>
#include <winpr/print.h>
#include <winpr/tchar.h>
#include <winpr/sysinfo.h>
#include <winpr/registry.h>
#include <winpr/endian.h>
#include <freerdp/build-config.h>
#include "ntlm.h"
#include "../sspi.h"
#include "ntlm_message.h"
#include "../../log.h"
#define TAG WINPR_TAG("sspi.NTLM")
#define WINPR_KEY "Software\\" FREERDP_VENDOR_STRING "\\" FREERDP_PRODUCT_STRING "\\WinPR\\NTLM"
static const char* NTLM_PACKAGE_NAME = "NTLM";
static int ntlm_SetContextWorkstation(NTLM_CONTEXT* context, char* Workstation)
{
int status;
char* ws = Workstation;
DWORD nSize = 0;
CHAR* computerName;
if (!Workstation)
{
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';
ws = computerName;
if (!ws)
return -1;
}
context->Workstation.Buffer = NULL;
status = ConvertToUnicode(CP_UTF8, 0, ws, -1, &context->Workstation.Buffer, 0);
if (!Workstation)
free(ws);
if (status <= 0)
return -1;
context->Workstation.Length = (USHORT)(status - 1);
context->Workstation.Length *= 2;
return 1;
}
static int ntlm_SetContextServicePrincipalNameW(NTLM_CONTEXT* context, LPWSTR ServicePrincipalName)
{
if (!ServicePrincipalName)
{
context->ServicePrincipalName.Buffer = NULL;
context->ServicePrincipalName.Length = 0;
return 1;
}
context->ServicePrincipalName.Length = (USHORT)(_wcslen(ServicePrincipalName) * 2);
context->ServicePrincipalName.Buffer = (PWSTR)malloc(context->ServicePrincipalName.Length + 2);
if (!context->ServicePrincipalName.Buffer)
return -1;
CopyMemory(context->ServicePrincipalName.Buffer, ServicePrincipalName,
context->ServicePrincipalName.Length + 2);
return 1;
}
static int ntlm_SetContextTargetName(NTLM_CONTEXT* context, char* TargetName)
{
int status;
char* name = TargetName;
DWORD nSize = 0;
CHAR* computerName = NULL;
if (!name)
{
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;
CharUpperA(name);
}
context->TargetName.pvBuffer = NULL;
status = ConvertToUnicode(CP_UTF8, 0, name, -1, (LPWSTR*)&context->TargetName.pvBuffer, 0);
if (status <= 0)
{
if (!TargetName)
free(name);
return -1;
}
context->TargetName.cbBuffer = (USHORT)((status - 1) * 2);
if (!TargetName)
free(name);
return 1;
}
static NTLM_CONTEXT* ntlm_ContextNew(void)
{
HKEY hKey;
LONG status;
DWORD dwType;
DWORD dwSize;
DWORD dwValue;
NTLM_CONTEXT* context;
context = (NTLM_CONTEXT*)calloc(1, sizeof(NTLM_CONTEXT));
if (!context)
return NULL;
context->NTLMv2 = TRUE;
context->UseMIC = FALSE;
context->SendVersionInfo = TRUE;
context->SendSingleHostData = FALSE;
context->SendWorkstationName = TRUE;
context->NegotiateKeyExchange = TRUE;
context->UseSamFileDatabase = TRUE;
status = RegOpenKeyExA(HKEY_LOCAL_MACHINE, WINPR_KEY, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);
if (status == ERROR_SUCCESS)
{
if (RegQueryValueEx(hKey, _T("NTLMv2"), NULL, &dwType, (BYTE*)&dwValue, &dwSize) ==
ERROR_SUCCESS)
context->NTLMv2 = dwValue ? 1 : 0;
if (RegQueryValueEx(hKey, _T("UseMIC"), NULL, &dwType, (BYTE*)&dwValue, &dwSize) ==
ERROR_SUCCESS)
context->UseMIC = dwValue ? 1 : 0;
if (RegQueryValueEx(hKey, _T("SendVersionInfo"), NULL, &dwType, (BYTE*)&dwValue, &dwSize) ==
ERROR_SUCCESS)
context->SendVersionInfo = dwValue ? 1 : 0;
if (RegQueryValueEx(hKey, _T("SendSingleHostData"), NULL, &dwType, (BYTE*)&dwValue,
&dwSize) == ERROR_SUCCESS)
context->SendSingleHostData = dwValue ? 1 : 0;
if (RegQueryValueEx(hKey, _T("SendWorkstationName"), NULL, &dwType, (BYTE*)&dwValue,
&dwSize) == ERROR_SUCCESS)
context->SendWorkstationName = dwValue ? 1 : 0;
if (RegQueryValueEx(hKey, _T("WorkstationName"), NULL, &dwType, NULL, &dwSize) ==
ERROR_SUCCESS)
{
char* workstation = (char*)malloc(dwSize + 1);
if (!workstation)
{
free(context);
return NULL;
}
status = RegQueryValueExA(hKey, "WorkstationName", NULL, &dwType, (BYTE*)workstation,
&dwSize);
workstation[dwSize] = '\0';
if (ntlm_SetContextWorkstation(context, workstation) < 0)
{
free(workstation);
free(context);
return NULL;
}
free(workstation);
}
RegCloseKey(hKey);
}
/*
* Extended Protection is enabled by default in Windows 7,
* but enabling it in WinPR breaks TS Gateway at this point
*/
context->SuppressExtendedProtection = FALSE;
status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("System\\CurrentControlSet\\Control\\LSA"), 0,
KEY_READ | KEY_WOW64_64KEY, &hKey);
if (status == ERROR_SUCCESS)
{
if (RegQueryValueEx(hKey, _T("SuppressExtendedProtection"), NULL, &dwType, (BYTE*)&dwValue,
&dwSize) == ERROR_SUCCESS)
context->SuppressExtendedProtection = dwValue ? 1 : 0;
RegCloseKey(hKey);
}
context->NegotiateFlags = 0;
context->LmCompatibilityLevel = 3;
context->state = NTLM_STATE_INITIAL;
FillMemory(context->MachineID, sizeof(context->MachineID), 0xAA);
if (context->NTLMv2)
context->UseMIC = TRUE;
return context;
}
static void ntlm_ContextFree(NTLM_CONTEXT* context)
{
if (!context)
return;
winpr_RC4_Free(context->SendRc4Seal);
winpr_RC4_Free(context->RecvRc4Seal);
sspi_SecBufferFree(&context->NegotiateMessage);
sspi_SecBufferFree(&context->ChallengeMessage);
sspi_SecBufferFree(&context->AuthenticateMessage);
sspi_SecBufferFree(&context->ChallengeTargetInfo);
sspi_SecBufferFree(&context->TargetName);
sspi_SecBufferFree(&context->NtChallengeResponse);
sspi_SecBufferFree(&context->LmChallengeResponse);
free(context->ServicePrincipalName.Buffer);
free(context->Workstation.Buffer);
free(context);
}
static SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleW(
SEC_WCHAR* pszPrincipal, SEC_WCHAR* pszPackage, ULONG fCredentialUse, void* pvLogonID,
void* pAuthData, SEC_GET_KEY_FN pGetKeyFn, void* pvGetKeyArgument, PCredHandle phCredential,
PTimeStamp ptsExpiry)
{
SSPI_CREDENTIALS* credentials;
SEC_WINNT_AUTH_IDENTITY* identity;
if ((fCredentialUse != SECPKG_CRED_OUTBOUND) && (fCredentialUse != SECPKG_CRED_INBOUND) &&
(fCredentialUse != SECPKG_CRED_BOTH))
{
return SEC_E_INVALID_PARAMETER;
}
credentials = sspi_CredentialsNew();
if (!credentials)
return SEC_E_INTERNAL_ERROR;
credentials->fCredentialUse = fCredentialUse;
credentials->pGetKeyFn = pGetKeyFn;
credentials->pvGetKeyArgument = pvGetKeyArgument;
identity = (SEC_WINNT_AUTH_IDENTITY*)pAuthData;
if (identity)
sspi_CopyAuthIdentity(&(credentials->identity), identity);
sspi_SecureHandleSetLowerPointer(phCredential, (void*)credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*)NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleA(
SEC_CHAR* pszPrincipal, SEC_CHAR* pszPackage, ULONG fCredentialUse, void* pvLogonID,
void* pAuthData, SEC_GET_KEY_FN pGetKeyFn, void* pvGetKeyArgument, PCredHandle phCredential,
PTimeStamp ptsExpiry)
{
SSPI_CREDENTIALS* credentials;
SEC_WINNT_AUTH_IDENTITY* identity;
if ((fCredentialUse != SECPKG_CRED_OUTBOUND) && (fCredentialUse != SECPKG_CRED_INBOUND) &&
(fCredentialUse != SECPKG_CRED_BOTH))
{
return SEC_E_INVALID_PARAMETER;
}
credentials = sspi_CredentialsNew();
if (!credentials)
return SEC_E_INTERNAL_ERROR;
credentials->fCredentialUse = fCredentialUse;
credentials->pGetKeyFn = pGetKeyFn;
credentials->pvGetKeyArgument = pvGetKeyArgument;
identity = (SEC_WINNT_AUTH_IDENTITY*)pAuthData;
if (identity)
sspi_CopyAuthIdentity(&(credentials->identity), identity);
sspi_SecureHandleSetLowerPointer(phCredential, (void*)credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*)NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_FreeCredentialsHandle(PCredHandle phCredential)
{
SSPI_CREDENTIALS* credentials;
if (!phCredential)
return SEC_E_INVALID_HANDLE;
credentials = (SSPI_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
if (!credentials)
return SEC_E_INVALID_HANDLE;
sspi_CredentialsFree(credentials);
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_QueryCredentialsAttributesW(PCredHandle phCredential,
ULONG ulAttribute, void* pBuffer)
{
if (ulAttribute == SECPKG_CRED_ATTR_NAMES)
{
return SEC_E_OK;
}
return SEC_E_UNSUPPORTED_FUNCTION;
}
static SECURITY_STATUS SEC_ENTRY ntlm_QueryCredentialsAttributesA(PCredHandle phCredential,
ULONG ulAttribute, void* pBuffer)
{
return ntlm_QueryCredentialsAttributesW(phCredential, ulAttribute, pBuffer);
}
/**
* @see http://msdn.microsoft.com/en-us/library/windows/desktop/aa374707
*/
static SECURITY_STATUS SEC_ENTRY
ntlm_AcceptSecurityContext(PCredHandle phCredential, PCtxtHandle phContext, PSecBufferDesc pInput,
ULONG fContextReq, ULONG TargetDataRep, PCtxtHandle phNewContext,
PSecBufferDesc pOutput, PULONG pfContextAttr, PTimeStamp ptsTimeStamp)
{
NTLM_CONTEXT* context;
SECURITY_STATUS status;
SSPI_CREDENTIALS* credentials;
PSecBuffer input_buffer;
PSecBuffer output_buffer;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (!context)
{
context = ntlm_ContextNew();
if (!context)
return SEC_E_INSUFFICIENT_MEMORY;
context->server = TRUE;
if (fContextReq & ASC_REQ_CONFIDENTIALITY)
context->confidentiality = TRUE;
credentials = (SSPI_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
context->credentials = credentials;
ntlm_SetContextTargetName(context, NULL);
sspi_SecureHandleSetLowerPointer(phNewContext, context);
sspi_SecureHandleSetUpperPointer(phNewContext, (void*)NTLM_PACKAGE_NAME);
}
if (context->state == NTLM_STATE_INITIAL)
{
context->state = NTLM_STATE_NEGOTIATE;
if (!pInput)
return SEC_E_INVALID_TOKEN;
if (pInput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
input_buffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
if (!input_buffer)
return SEC_E_INVALID_TOKEN;
if (input_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
status = ntlm_read_NegotiateMessage(context, input_buffer);
if (context->state == NTLM_STATE_CHALLENGE)
{
if (!pOutput)
return SEC_E_INVALID_TOKEN;
if (pOutput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
output_buffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
if (!output_buffer->BufferType)
return SEC_E_INVALID_TOKEN;
if (output_buffer->cbBuffer < 1)
return SEC_E_INSUFFICIENT_MEMORY;
return ntlm_write_ChallengeMessage(context, output_buffer);
}
return SEC_E_OUT_OF_SEQUENCE;
}
else if (context->state == NTLM_STATE_AUTHENTICATE)
{
if (!pInput)
return SEC_E_INVALID_TOKEN;
if (pInput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
input_buffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
if (!input_buffer)
return SEC_E_INVALID_TOKEN;
if (input_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
status = ntlm_read_AuthenticateMessage(context, input_buffer);
if (pOutput)
{
ULONG i;
for (i = 0; i < pOutput->cBuffers; i++)
{
pOutput->pBuffers[i].cbBuffer = 0;
pOutput->pBuffers[i].BufferType = SECBUFFER_TOKEN;
}
}
return status;
}
return SEC_E_OUT_OF_SEQUENCE;
}
static SECURITY_STATUS SEC_ENTRY ntlm_ImpersonateSecurityContext(PCtxtHandle phContext)
{
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
PCredHandle phCredential, PCtxtHandle phContext, SEC_WCHAR* pszTargetName, ULONG fContextReq,
ULONG Reserved1, ULONG TargetDataRep, PSecBufferDesc pInput, ULONG Reserved2,
PCtxtHandle phNewContext, PSecBufferDesc pOutput, PULONG pfContextAttr, PTimeStamp ptsExpiry)
{
NTLM_CONTEXT* context;
SECURITY_STATUS status;
SSPI_CREDENTIALS* credentials;
PSecBuffer input_buffer = NULL;
PSecBuffer output_buffer = NULL;
PSecBuffer channel_bindings = NULL;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (!context)
{
context = ntlm_ContextNew();
if (!context)
return SEC_E_INSUFFICIENT_MEMORY;
if (fContextReq & ISC_REQ_CONFIDENTIALITY)
context->confidentiality = TRUE;
credentials = (SSPI_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
context->credentials = credentials;
if (context->Workstation.Length < 1)
{
if (ntlm_SetContextWorkstation(context, NULL) < 0)
{
ntlm_ContextFree(context);
return SEC_E_INTERNAL_ERROR;
}
}
if (ntlm_SetContextServicePrincipalNameW(context, pszTargetName) < 0)
{
ntlm_ContextFree(context);
return SEC_E_INTERNAL_ERROR;
}
sspi_SecureHandleSetLowerPointer(phNewContext, context);
sspi_SecureHandleSetUpperPointer(phNewContext, (void*)NTLM_PACKAGE_NAME);
}
if ((!pInput) || (context->state == NTLM_STATE_AUTHENTICATE))
{
if (!pOutput)
return SEC_E_INVALID_TOKEN;
if (pOutput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
output_buffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
if (!output_buffer)
return SEC_E_INVALID_TOKEN;
if (output_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
if (context->state == NTLM_STATE_INITIAL)
context->state = NTLM_STATE_NEGOTIATE;
if (context->state == NTLM_STATE_NEGOTIATE)
return ntlm_write_NegotiateMessage(context, output_buffer);
return SEC_E_OUT_OF_SEQUENCE;
}
else
{
if (pInput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
input_buffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
if (!input_buffer)
return SEC_E_INVALID_TOKEN;
if (input_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
channel_bindings = sspi_FindSecBuffer(pInput, SECBUFFER_CHANNEL_BINDINGS);
if (channel_bindings)
{
context->Bindings.BindingsLength = channel_bindings->cbBuffer;
context->Bindings.Bindings = (SEC_CHANNEL_BINDINGS*)channel_bindings->pvBuffer;
}
if (context->state == NTLM_STATE_CHALLENGE)
{
status = ntlm_read_ChallengeMessage(context, input_buffer);
if (!pOutput)
return SEC_E_INVALID_TOKEN;
if (pOutput->cBuffers < 1)
return SEC_E_INVALID_TOKEN;
output_buffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
if (!output_buffer)
return SEC_E_INVALID_TOKEN;
if (output_buffer->cbBuffer < 1)
return SEC_E_INSUFFICIENT_MEMORY;
if (context->state == NTLM_STATE_AUTHENTICATE)
return ntlm_write_AuthenticateMessage(context, output_buffer);
}
return SEC_E_OUT_OF_SEQUENCE;
}
return SEC_E_OUT_OF_SEQUENCE;
}
/**
* @see http://msdn.microsoft.com/en-us/library/windows/desktop/aa375512%28v=vs.85%29.aspx
*/
static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextA(
PCredHandle phCredential, PCtxtHandle phContext, SEC_CHAR* pszTargetName, ULONG fContextReq,
ULONG Reserved1, ULONG TargetDataRep, PSecBufferDesc pInput, ULONG Reserved2,
PCtxtHandle phNewContext, PSecBufferDesc pOutput, PULONG pfContextAttr, PTimeStamp ptsExpiry)
{
SECURITY_STATUS status;
SEC_WCHAR* pszTargetNameW = NULL;
if (pszTargetName)
{
if (ConvertToUnicode(CP_UTF8, 0, pszTargetName, -1, &pszTargetNameW, 0) <= 0)
return SEC_E_INTERNAL_ERROR;
}
status = ntlm_InitializeSecurityContextW(phCredential, phContext, pszTargetNameW, fContextReq,
Reserved1, TargetDataRep, pInput, Reserved2,
phNewContext, pOutput, pfContextAttr, ptsExpiry);
free(pszTargetNameW);
return status;
}
static SECURITY_STATUS SEC_ENTRY ntlm_CompleteAuthToken(PCtxtHandle phContext,
PSecBufferDesc pToken)
{
NTLM_CONTEXT* context;
SECURITY_STATUS status = SEC_E_OK;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (!context)
return SEC_E_INVALID_HANDLE;
if (context->server)
{
status = ntlm_server_AuthenticateComplete(context);
}
return status;
}
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375354 */
static SECURITY_STATUS SEC_ENTRY ntlm_DeleteSecurityContext(PCtxtHandle phContext)
{
NTLM_CONTEXT* context;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (!context)
return SEC_E_INVALID_HANDLE;
ntlm_ContextFree(context);
return SEC_E_OK;
}
SECURITY_STATUS ntlm_computeProofValue(NTLM_CONTEXT* ntlm, SecBuffer* ntproof)
{
BYTE* blob;
SecBuffer* target = &ntlm->ChallengeTargetInfo;
if (!sspi_SecBufferAlloc(ntproof, 36 + target->cbBuffer))
return SEC_E_INSUFFICIENT_MEMORY;
blob = (BYTE*)ntproof->pvBuffer;
CopyMemory(blob, ntlm->ServerChallenge, 8); /* Server challenge. */
blob[8] = 1; /* Response version. */
blob[9] = 1; /* Highest response version understood by the client. */
/* Reserved 6B. */
CopyMemory(&blob[16], ntlm->Timestamp, 8); /* Time. */
CopyMemory(&blob[24], ntlm->ClientChallenge, 8); /* Client challenge. */
/* Reserved 4B. */
/* Server name. */
CopyMemory(&blob[36], target->pvBuffer, target->cbBuffer);
return SEC_E_OK;
}
SECURITY_STATUS ntlm_computeMicValue(NTLM_CONTEXT* ntlm, SecBuffer* micvalue)
{
BYTE* blob;
ULONG msgSize = ntlm->NegotiateMessage.cbBuffer + ntlm->ChallengeMessage.cbBuffer +
ntlm->AuthenticateMessage.cbBuffer;
if (!sspi_SecBufferAlloc(micvalue, msgSize))
return SEC_E_INSUFFICIENT_MEMORY;
blob = (BYTE*)micvalue->pvBuffer;
CopyMemory(blob, ntlm->NegotiateMessage.pvBuffer, ntlm->NegotiateMessage.cbBuffer);
blob += ntlm->NegotiateMessage.cbBuffer;
CopyMemory(blob, ntlm->ChallengeMessage.pvBuffer, ntlm->ChallengeMessage.cbBuffer);
blob += ntlm->ChallengeMessage.cbBuffer;
CopyMemory(blob, ntlm->AuthenticateMessage.pvBuffer, ntlm->AuthenticateMessage.cbBuffer);
blob += ntlm->MessageIntegrityCheckOffset;
ZeroMemory(blob, 16);
return SEC_E_OK;
}
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa379337/ */
static SECURITY_STATUS SEC_ENTRY ntlm_QueryContextAttributesW(PCtxtHandle phContext,
ULONG ulAttribute, void* pBuffer)
{
NTLM_CONTEXT* context;
if (!phContext)
return SEC_E_INVALID_HANDLE;
if (!pBuffer)
return SEC_E_INSUFFICIENT_MEMORY;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (ulAttribute == SECPKG_ATTR_SIZES)
{
SecPkgContext_Sizes* ContextSizes = (SecPkgContext_Sizes*)pBuffer;
ContextSizes->cbMaxToken = 2010;
ContextSizes->cbMaxSignature = 16; /* the size of expected signature is 16 bytes */
ContextSizes->cbBlockSize = 0; /* no padding */
ContextSizes->cbSecurityTrailer = 16; /* no security trailer appended in NTLM
contrary to Kerberos */
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_IDENTITY)
{
int status;
char* UserA = NULL;
char* DomainA = NULL;
SSPI_CREDENTIALS* credentials;
SecPkgContext_AuthIdentity* AuthIdentity = (SecPkgContext_AuthIdentity*)pBuffer;
context->UseSamFileDatabase = FALSE;
credentials = context->credentials;
ZeroMemory(AuthIdentity, sizeof(SecPkgContext_AuthIdentity));
UserA = AuthIdentity->User;
if (credentials->identity.UserLength > 0)
{
status = ConvertFromUnicode(CP_UTF8, 0, (WCHAR*)credentials->identity.User,
credentials->identity.UserLength, &UserA, 256, NULL, NULL);
if (status <= 0)
return SEC_E_INTERNAL_ERROR;
}
DomainA = AuthIdentity->Domain;
if (credentials->identity.DomainLength > 0)
{
status =
ConvertFromUnicode(CP_UTF8, 0, (WCHAR*)credentials->identity.Domain,
credentials->identity.DomainLength, &DomainA, 256, NULL, NULL);
if (status <= 0)
return SEC_E_INTERNAL_ERROR;
}
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_NTPROOF_VALUE)
{
return ntlm_computeProofValue(context, (SecBuffer*)pBuffer);
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_RANDKEY)
{
SecBuffer* randkey;
randkey = (SecBuffer*)pBuffer;
if (!sspi_SecBufferAlloc(randkey, 16))
return (SEC_E_INSUFFICIENT_MEMORY);
CopyMemory(randkey->pvBuffer, context->EncryptedRandomSessionKey, 16);
return (SEC_E_OK);
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_MIC)
{
SecBuffer* mic;
NTLM_AUTHENTICATE_MESSAGE* message;
mic = (SecBuffer*)pBuffer;
message = &context->AUTHENTICATE_MESSAGE;
if (!sspi_SecBufferAlloc(mic, 16))
return (SEC_E_INSUFFICIENT_MEMORY);
CopyMemory(mic->pvBuffer, message->MessageIntegrityCheck, 16);
return (SEC_E_OK);
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_MIC_VALUE)
{
return ntlm_computeMicValue(context, (SecBuffer*)pBuffer);
}
return SEC_E_UNSUPPORTED_FUNCTION;
}
static SECURITY_STATUS SEC_ENTRY ntlm_QueryContextAttributesA(PCtxtHandle phContext,
ULONG ulAttribute, void* pBuffer)
{
return ntlm_QueryContextAttributesW(phContext, ulAttribute, pBuffer);
}
static SECURITY_STATUS SEC_ENTRY ntlm_SetContextAttributesW(PCtxtHandle phContext,
ULONG ulAttribute, void* pBuffer,
ULONG cbBuffer)
{
NTLM_CONTEXT* context;
if (!phContext)
return SEC_E_INVALID_HANDLE;
if (!pBuffer)
return SEC_E_INVALID_PARAMETER;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_HASH)
{
SecPkgContext_AuthNtlmHash* AuthNtlmHash = (SecPkgContext_AuthNtlmHash*)pBuffer;
if (cbBuffer < sizeof(SecPkgContext_AuthNtlmHash))
return SEC_E_INVALID_PARAMETER;
if (AuthNtlmHash->Version == 1)
CopyMemory(context->NtlmHash, AuthNtlmHash->NtlmHash, 16);
else if (AuthNtlmHash->Version == 2)
CopyMemory(context->NtlmV2Hash, AuthNtlmHash->NtlmHash, 16);
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_SAM_FILE)
{
const char* filename = (char*)pBuffer;
free(context->SamFile);
context->SamFile = NULL;
if (filename)
{
context->SamFile = _strdup(filename);
if (!context->SamFile)
return SEC_E_INSUFFICIENT_MEMORY;
}
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_MESSAGE)
{
SecPkgContext_AuthNtlmMessage* AuthNtlmMessage = (SecPkgContext_AuthNtlmMessage*)pBuffer;
if (cbBuffer < sizeof(SecPkgContext_AuthNtlmMessage))
return SEC_E_INVALID_PARAMETER;
if (AuthNtlmMessage->type == 1)
{
sspi_SecBufferFree(&context->NegotiateMessage);
if (!sspi_SecBufferAlloc(&context->NegotiateMessage, AuthNtlmMessage->length))
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(context->NegotiateMessage.pvBuffer, AuthNtlmMessage->buffer,
AuthNtlmMessage->length);
}
else if (AuthNtlmMessage->type == 2)
{
sspi_SecBufferFree(&context->ChallengeMessage);
if (!sspi_SecBufferAlloc(&context->ChallengeMessage, AuthNtlmMessage->length))
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(context->ChallengeMessage.pvBuffer, AuthNtlmMessage->buffer,
AuthNtlmMessage->length);
}
else if (AuthNtlmMessage->type == 3)
{
sspi_SecBufferFree(&context->AuthenticateMessage);
if (!sspi_SecBufferAlloc(&context->AuthenticateMessage, AuthNtlmMessage->length))
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(context->AuthenticateMessage.pvBuffer, AuthNtlmMessage->buffer,
AuthNtlmMessage->length);
}
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_TIMESTAMP)
{
SecPkgContext_AuthNtlmTimestamp* AuthNtlmTimestamp =
(SecPkgContext_AuthNtlmTimestamp*)pBuffer;
if (cbBuffer < sizeof(SecPkgContext_AuthNtlmTimestamp))
return SEC_E_INVALID_PARAMETER;
if (AuthNtlmTimestamp->ChallengeOrResponse)
CopyMemory(context->ChallengeTimestamp, AuthNtlmTimestamp->Timestamp, 8);
else
CopyMemory(context->Timestamp, AuthNtlmTimestamp->Timestamp, 8);
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_CLIENT_CHALLENGE)
{
SecPkgContext_AuthNtlmClientChallenge* AuthNtlmClientChallenge =
(SecPkgContext_AuthNtlmClientChallenge*)pBuffer;
if (cbBuffer < sizeof(SecPkgContext_AuthNtlmClientChallenge))
return SEC_E_INVALID_PARAMETER;
CopyMemory(context->ClientChallenge, AuthNtlmClientChallenge->ClientChallenge, 8);
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_SERVER_CHALLENGE)
{
SecPkgContext_AuthNtlmServerChallenge* AuthNtlmServerChallenge =
(SecPkgContext_AuthNtlmServerChallenge*)pBuffer;
if (cbBuffer < sizeof(SecPkgContext_AuthNtlmServerChallenge))
return SEC_E_INVALID_PARAMETER;
CopyMemory(context->ServerChallenge, AuthNtlmServerChallenge->ServerChallenge, 8);
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_HASH_CB)
{
context->HashCallback = (psPeerComputeNtlmHash)pBuffer;
return SEC_E_OK;
}
else if (ulAttribute == SECPKG_ATTR_AUTH_NTLM_HASH_CB_DATA)
{
context->HashCallbackArg = pBuffer;
return SEC_E_OK;
}
return SEC_E_UNSUPPORTED_FUNCTION;
}
static SECURITY_STATUS SEC_ENTRY ntlm_SetContextAttributesA(PCtxtHandle phContext,
ULONG ulAttribute, void* pBuffer,
ULONG cbBuffer)
{
return ntlm_SetContextAttributesW(phContext, ulAttribute, pBuffer, cbBuffer);
}
static SECURITY_STATUS SEC_ENTRY ntlm_RevertSecurityContext(PCtxtHandle phContext)
{
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_EncryptMessage(PCtxtHandle phContext, ULONG fQOP,
PSecBufferDesc pMessage, ULONG MessageSeqNo)
{
int index;
int length;
void* data;
UINT32 SeqNo;
UINT32 value;
BYTE digest[WINPR_MD5_DIGEST_LENGTH];
BYTE checksum[8];
BYTE* signature;
ULONG version = 1;
WINPR_HMAC_CTX* hmac;
NTLM_CONTEXT* context;
PSecBuffer data_buffer = NULL;
PSecBuffer signature_buffer = NULL;
SeqNo = MessageSeqNo;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
for (index = 0; index < (int)pMessage->cBuffers; index++)
{
if (pMessage->pBuffers[index].BufferType == SECBUFFER_DATA)
data_buffer = &pMessage->pBuffers[index];
else if (pMessage->pBuffers[index].BufferType == SECBUFFER_TOKEN)
signature_buffer = &pMessage->pBuffers[index];
}
if (!data_buffer)
return SEC_E_INVALID_TOKEN;
if (!signature_buffer)
return SEC_E_INVALID_TOKEN;
/* Copy original data buffer */
length = data_buffer->cbBuffer;
data = malloc(length);
if (!data)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(data, data_buffer->pvBuffer, length);
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,data) using the client signing key */
hmac = winpr_HMAC_New();
if (hmac &&
winpr_HMAC_Init(hmac, WINPR_MD_MD5, context->SendSigningKey, WINPR_MD5_DIGEST_LENGTH))
{
Data_Write_UINT32(&value, SeqNo);
winpr_HMAC_Update(hmac, (void*)&value, 4);
winpr_HMAC_Update(hmac, (void*)data, length);
winpr_HMAC_Final(hmac, digest, WINPR_MD5_DIGEST_LENGTH);
winpr_HMAC_Free(hmac);
}
else
{
winpr_HMAC_Free(hmac);
free(data);
return SEC_E_INSUFFICIENT_MEMORY;
}
/* Encrypt message using with RC4, result overwrites original buffer */
if (context->confidentiality)
winpr_RC4_Update(context->SendRc4Seal, length, (BYTE*)data, (BYTE*)data_buffer->pvBuffer);
else
CopyMemory(data_buffer->pvBuffer, data, length);
#ifdef WITH_DEBUG_NTLM
WLog_DBG(TAG, "Data Buffer (length = %d)", length);
winpr_HexDump(TAG, WLOG_DEBUG, data, length);
WLog_DBG(TAG, "Encrypted Data Buffer (length = %" PRIu32 ")", data_buffer->cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, data_buffer->pvBuffer, data_buffer->cbBuffer);
#endif
free(data);
/* RC4-encrypt first 8 bytes of digest */
winpr_RC4_Update(context->SendRc4Seal, 8, digest, checksum);
signature = (BYTE*)signature_buffer->pvBuffer;
/* Concatenate version, ciphertext and sequence number to build signature */
Data_Write_UINT32(signature, version);
CopyMemory(&signature[4], (void*)checksum, 8);
Data_Write_UINT32(&signature[12], SeqNo);
context->SendSeqNum++;
#ifdef WITH_DEBUG_NTLM
WLog_DBG(TAG, "Signature (length = %" PRIu32 ")", signature_buffer->cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, signature_buffer->pvBuffer, signature_buffer->cbBuffer);
#endif
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_DecryptMessage(PCtxtHandle phContext, PSecBufferDesc pMessage,
ULONG MessageSeqNo, PULONG pfQOP)
{
int index;
int length;
void* data;
UINT32 SeqNo;
UINT32 value;
BYTE digest[WINPR_MD5_DIGEST_LENGTH];
BYTE checksum[8];
UINT32 version = 1;
WINPR_HMAC_CTX* hmac;
NTLM_CONTEXT* context;
BYTE expected_signature[WINPR_MD5_DIGEST_LENGTH];
PSecBuffer data_buffer = NULL;
PSecBuffer signature_buffer = NULL;
SeqNo = (UINT32)MessageSeqNo;
context = (NTLM_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
for (index = 0; index < (int)pMessage->cBuffers; index++)
{
if (pMessage->pBuffers[index].BufferType == SECBUFFER_DATA)
data_buffer = &pMessage->pBuffers[index];
else if (pMessage->pBuffers[index].BufferType == SECBUFFER_TOKEN)
signature_buffer = &pMessage->pBuffers[index];
}
if (!data_buffer)
return SEC_E_INVALID_TOKEN;
if (!signature_buffer)
return SEC_E_INVALID_TOKEN;
/* Copy original data buffer */
length = data_buffer->cbBuffer;
data = malloc(length);
if (!data)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(data, data_buffer->pvBuffer, length);
/* Decrypt message using with RC4, result overwrites original buffer */
if (context->confidentiality)
winpr_RC4_Update(context->RecvRc4Seal, length, (BYTE*)data, (BYTE*)data_buffer->pvBuffer);
else
CopyMemory(data_buffer->pvBuffer, data, length);
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,data) using the client signing key */
hmac = winpr_HMAC_New();
if (hmac &&
winpr_HMAC_Init(hmac, WINPR_MD_MD5, context->RecvSigningKey, WINPR_MD5_DIGEST_LENGTH))
{
Data_Write_UINT32(&value, SeqNo);
winpr_HMAC_Update(hmac, (void*)&value, 4);
winpr_HMAC_Update(hmac, (void*)data_buffer->pvBuffer, data_buffer->cbBuffer);
winpr_HMAC_Final(hmac, digest, WINPR_MD5_DIGEST_LENGTH);
winpr_HMAC_Free(hmac);
}
else
{
winpr_HMAC_Free(hmac);
free(data);
return SEC_E_INSUFFICIENT_MEMORY;
}
#ifdef WITH_DEBUG_NTLM
WLog_DBG(TAG, "Encrypted Data Buffer (length = %d)", length);
winpr_HexDump(TAG, WLOG_DEBUG, data, length);
WLog_DBG(TAG, "Data Buffer (length = %" PRIu32 ")", data_buffer->cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, data_buffer->pvBuffer, data_buffer->cbBuffer);
#endif
free(data);
/* RC4-encrypt first 8 bytes of digest */
winpr_RC4_Update(context->RecvRc4Seal, 8, digest, checksum);
/* Concatenate version, ciphertext and sequence number to build signature */
Data_Write_UINT32(expected_signature, version);
CopyMemory(&expected_signature[4], (void*)checksum, 8);
Data_Write_UINT32(&expected_signature[12], SeqNo);
context->RecvSeqNum++;
if (memcmp(signature_buffer->pvBuffer, expected_signature, 16) != 0)
{
/* signature verification failed! */
WLog_ERR(TAG, "signature verification failed, something nasty is going on!");
#ifdef WITH_DEBUG_NTLM
WLog_ERR(TAG, "Expected Signature:");
winpr_HexDump(TAG, WLOG_ERROR, expected_signature, 16);
WLog_ERR(TAG, "Actual Signature:");
winpr_HexDump(TAG, WLOG_ERROR, (BYTE*)signature_buffer->pvBuffer, 16);
#endif
return SEC_E_MESSAGE_ALTERED;
}
return SEC_E_OK;
}
static SECURITY_STATUS SEC_ENTRY ntlm_MakeSignature(PCtxtHandle phContext, ULONG fQOP,
PSecBufferDesc pMessage, ULONG MessageSeqNo)
{
return SEC_E_UNSUPPORTED_FUNCTION;
}
static SECURITY_STATUS SEC_ENTRY ntlm_VerifySignature(PCtxtHandle phContext,
PSecBufferDesc pMessage, ULONG MessageSeqNo,
PULONG pfQOP)
{
return SEC_E_UNSUPPORTED_FUNCTION;
}
const SecurityFunctionTableA NTLM_SecurityFunctionTableA = {
1, /* dwVersion */
NULL, /* EnumerateSecurityPackages */
ntlm_QueryCredentialsAttributesA, /* QueryCredentialsAttributes */
ntlm_AcquireCredentialsHandleA, /* AcquireCredentialsHandle */
ntlm_FreeCredentialsHandle, /* FreeCredentialsHandle */
NULL, /* Reserved2 */
ntlm_InitializeSecurityContextA, /* InitializeSecurityContext */
ntlm_AcceptSecurityContext, /* AcceptSecurityContext */
ntlm_CompleteAuthToken, /* CompleteAuthToken */
ntlm_DeleteSecurityContext, /* DeleteSecurityContext */
NULL, /* ApplyControlToken */
ntlm_QueryContextAttributesA, /* QueryContextAttributes */
ntlm_ImpersonateSecurityContext, /* ImpersonateSecurityContext */
ntlm_RevertSecurityContext, /* RevertSecurityContext */
ntlm_MakeSignature, /* MakeSignature */
ntlm_VerifySignature, /* VerifySignature */
NULL, /* FreeContextBuffer */
NULL, /* QuerySecurityPackageInfo */
NULL, /* Reserved3 */
NULL, /* Reserved4 */
NULL, /* ExportSecurityContext */
NULL, /* ImportSecurityContext */
NULL, /* AddCredentials */
NULL, /* Reserved8 */
NULL, /* QuerySecurityContextToken */
ntlm_EncryptMessage, /* EncryptMessage */
ntlm_DecryptMessage, /* DecryptMessage */
ntlm_SetContextAttributesA, /* SetContextAttributes */
};
const SecurityFunctionTableW NTLM_SecurityFunctionTableW = {
1, /* dwVersion */
NULL, /* EnumerateSecurityPackages */
ntlm_QueryCredentialsAttributesW, /* QueryCredentialsAttributes */
ntlm_AcquireCredentialsHandleW, /* AcquireCredentialsHandle */
ntlm_FreeCredentialsHandle, /* FreeCredentialsHandle */
NULL, /* Reserved2 */
ntlm_InitializeSecurityContextW, /* InitializeSecurityContext */
ntlm_AcceptSecurityContext, /* AcceptSecurityContext */
ntlm_CompleteAuthToken, /* CompleteAuthToken */
ntlm_DeleteSecurityContext, /* DeleteSecurityContext */
NULL, /* ApplyControlToken */
ntlm_QueryContextAttributesW, /* QueryContextAttributes */
ntlm_ImpersonateSecurityContext, /* ImpersonateSecurityContext */
ntlm_RevertSecurityContext, /* RevertSecurityContext */
ntlm_MakeSignature, /* MakeSignature */
ntlm_VerifySignature, /* VerifySignature */
NULL, /* FreeContextBuffer */
NULL, /* QuerySecurityPackageInfo */
NULL, /* Reserved3 */
NULL, /* Reserved4 */
NULL, /* ExportSecurityContext */
NULL, /* ImportSecurityContext */
NULL, /* AddCredentials */
NULL, /* Reserved8 */
NULL, /* QuerySecurityContextToken */
ntlm_EncryptMessage, /* EncryptMessage */
ntlm_DecryptMessage, /* DecryptMessage */
ntlm_SetContextAttributesA, /* SetContextAttributes */
};
const SecPkgInfoA NTLM_SecPkgInfoA = {
0x00082B37, /* fCapabilities */
1, /* wVersion */
0x000A, /* wRPCID */
0x00000B48, /* cbMaxToken */
"NTLM", /* Name */
"NTLM Security Package" /* Comment */
};
static WCHAR NTLM_SecPkgInfoW_Name[] = { 'N', 'T', 'L', 'M', '\0' };
static WCHAR NTLM_SecPkgInfoW_Comment[] = {
'N', 'T', 'L', 'M', ' ', 'S', 'e', 'c', 'u', 'r', 'i',
't', 'y', ' ', 'P', 'a', 'c', 'k', 'a', 'g', 'e', '\0'
};
const SecPkgInfoW NTLM_SecPkgInfoW = {
0x00082B37, /* fCapabilities */
1, /* wVersion */
0x000A, /* wRPCID */
0x00000B48, /* cbMaxToken */
NTLM_SecPkgInfoW_Name, /* Name */
NTLM_SecPkgInfoW_Comment /* Comment */
};