FreeRDP/winpr/libwinpr/sspi/NTLM/ntlm.c
2012-08-22 22:24:29 -04:00

850 lines
24 KiB
C

/**
* WinPR: Windows Portable Runtime
* NTLM Security Package
*
* Copyright 2011-2012 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 <time.h>
#include <openssl/des.h>
#include <openssl/md4.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/engine.h>
#include <winpr/crt.h>
#include <winpr/sspi.h>
#include <winpr/print.h>
#include <winpr/sysinfo.h>
#include <winpr/registry.h>
#include "ntlm.h"
#include "../sspi.h"
#include "ntlm_message.h"
char* NTLM_PACKAGE_NAME = "NTLM";
void ntlm_SetContextWorkstation(NTLM_CONTEXT* context, char* Workstation)
{
DWORD nSize = 0;
if (!Workstation)
{
GetComputerNameExA(ComputerNameNetBIOS, NULL, &nSize);
Workstation = malloc(nSize);
GetComputerNameExA(ComputerNameNetBIOS, Workstation, &nSize);
}
context->Workstation.Length = strlen(Workstation) * 2;
context->Workstation.Buffer = (PWSTR) malloc(context->Workstation.Length);
MultiByteToWideChar(CP_ACP, 0, Workstation, strlen(Workstation),
context->Workstation.Buffer, context->Workstation.Length / 2);
if (nSize > 0)
free(Workstation);
}
void ntlm_SetContextServicePrincipalNameW(NTLM_CONTEXT* context, LPWSTR ServicePrincipalName)
{
context->ServicePrincipalName.Length = lstrlenW(ServicePrincipalName) * 2;
context->ServicePrincipalName.Buffer = (PWSTR) malloc(context->ServicePrincipalName.Length);
CopyMemory(context->ServicePrincipalName.Buffer, ServicePrincipalName, context->ServicePrincipalName.Length);
}
void ntlm_SetContextServicePrincipalNameA(NTLM_CONTEXT* context, char* ServicePrincipalName)
{
context->ServicePrincipalName.Length = strlen(ServicePrincipalName) * 2;
context->ServicePrincipalName.Buffer = (PWSTR) malloc(context->ServicePrincipalName.Length);
MultiByteToWideChar(CP_ACP, 0, ServicePrincipalName, strlen(ServicePrincipalName),
context->ServicePrincipalName.Buffer, context->ServicePrincipalName.Length / 2);
}
void ntlm_SetContextTargetName(NTLM_CONTEXT* context, char* TargetName)
{
DWORD nSize = 0;
if (!TargetName)
{
GetComputerNameExA(ComputerNameDnsHostname, NULL, &nSize);
TargetName = malloc(nSize);
GetComputerNameExA(ComputerNameDnsHostname, TargetName, &nSize);
CharUpperA(TargetName);
}
context->TargetName.cbBuffer = strlen(TargetName) * 2;
context->TargetName.pvBuffer = (void*) malloc(context->TargetName.cbBuffer);
MultiByteToWideChar(CP_ACP, 0, TargetName, strlen(TargetName),
(LPWSTR) context->TargetName.pvBuffer, context->TargetName.cbBuffer / 2);
if (nSize > 0)
free(TargetName);
}
NTLM_CONTEXT* ntlm_ContextNew()
{
NTLM_CONTEXT* context;
context = (NTLM_CONTEXT*) malloc(sizeof(NTLM_CONTEXT));
ZeroMemory(context, sizeof(NTLM_CONTEXT));
if (context != NULL)
{
HKEY hKey;
LONG status;
DWORD dwType;
DWORD dwSize;
DWORD dwValue;
context->NTLMv2 = TRUE;
context->UseMIC = FALSE;
context->SendVersionInfo = TRUE;
status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("Software\\WinPR\\NTLM"), 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;
RegCloseKey(hKey);
}
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;
memset(context->MachineID, 0xAA, sizeof(context->MachineID));
if (context->NTLMv2)
context->UseMIC = TRUE;
}
return context;
}
void ntlm_ContextFree(NTLM_CONTEXT* context)
{
if (!context)
return;
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->identity.User);
free(context->identity.Password);
free(context->identity.Domain);
free(context->Workstation.Buffer);
free(context);
}
SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleW(SEC_WCHAR* pszPrincipal, SEC_WCHAR* pszPackage,
ULONG fCredentialUse, PLUID pvLogonID, void* pAuthData, SEC_GET_KEY_FN pGetKeyFn,
void* pvGetKeyArgument, PCredHandle phCredential, PTimeStamp ptsExpiry)
{
CREDENTIALS* credentials;
SEC_WINNT_AUTH_IDENTITY* identity;
if (fCredentialUse == SECPKG_CRED_OUTBOUND)
{
credentials = sspi_CredentialsNew();
identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
if (identity != NULL)
CopyMemory(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
else if (fCredentialUse == SECPKG_CRED_INBOUND)
{
credentials = sspi_CredentialsNew();
identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
if (identity)
CopyMemory(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
else
ZeroMemory(&(credentials->identity), sizeof(SEC_WINNT_AUTH_IDENTITY));
sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleA(SEC_CHAR* pszPrincipal, SEC_CHAR* pszPackage,
ULONG fCredentialUse, PLUID pvLogonID, void* pAuthData, SEC_GET_KEY_FN pGetKeyFn,
void* pvGetKeyArgument, PCredHandle phCredential, PTimeStamp ptsExpiry)
{
CREDENTIALS* credentials;
SEC_WINNT_AUTH_IDENTITY* identity;
if (fCredentialUse == SECPKG_CRED_OUTBOUND)
{
credentials = sspi_CredentialsNew();
identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
if (identity != NULL)
CopyMemory(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
else if (fCredentialUse == SECPKG_CRED_INBOUND)
{
credentials = sspi_CredentialsNew();
identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
if (identity != NULL)
CopyMemory(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
return SEC_E_OK;
}
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_FreeCredentialsHandle(PCredHandle phCredential)
{
CREDENTIALS* credentials;
if (!phCredential)
return SEC_E_INVALID_HANDLE;
credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
if (!credentials)
return SEC_E_INVALID_HANDLE;
sspi_CredentialsFree(credentials);
return SEC_E_OK;
}
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;
}
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
*/
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;
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 = 1;
if (fContextReq & ASC_REQ_CONFIDENTIALITY)
context->confidentiality = 1;
credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
sspi_CopyAuthIdentity(&context->identity, &credentials->identity);
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 = &pInput->pBuffers[0];
if (input_buffer->BufferType != SECBUFFER_TOKEN)
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 = &pOutput->pBuffers[0];
if (output_buffer->BufferType != SECBUFFER_TOKEN)
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 = &pInput->pBuffers[0];
if (input_buffer->BufferType != SECBUFFER_TOKEN)
return SEC_E_INVALID_TOKEN;
if (input_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
status = ntlm_read_AuthenticateMessage(context, input_buffer);
return status;
}
return SEC_E_OUT_OF_SEQUENCE;
}
SECURITY_STATUS SEC_ENTRY ntlm_ImpersonateSecurityContext(PCtxtHandle phContext)
{
return SEC_E_OK;
}
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;
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;
if (fContextReq & ISC_REQ_CONFIDENTIALITY)
context->confidentiality = 1;
credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
ntlm_SetContextWorkstation(context, NULL);
ntlm_SetContextServicePrincipalNameW(context, pszTargetName);
sspi_CopyAuthIdentity(&context->identity, &credentials->identity);
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 = &pOutput->pBuffers[0];
if (output_buffer->BufferType != SECBUFFER_TOKEN)
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 = &pInput->pBuffers[0];
if (input_buffer->BufferType != SECBUFFER_TOKEN)
return SEC_E_INVALID_TOKEN;
if (input_buffer->cbBuffer < 1)
return SEC_E_INVALID_TOKEN;
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 = &pOutput->pBuffers[0];
if (output_buffer->BufferType != SECBUFFER_TOKEN)
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
*/
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)
{
int length;
SECURITY_STATUS status;
SEC_WCHAR* pszTargetNameW = NULL;
if (pszTargetName != NULL)
{
length = strlen(pszTargetName);
pszTargetNameW = (PWSTR) malloc((length + 1) * 2);
MultiByteToWideChar(CP_ACP, 0, pszTargetName, length, pszTargetNameW, length);
pszTargetNameW[length] = 0;
}
status = ntlm_InitializeSecurityContextW(phCredential, phContext, pszTargetNameW, fContextReq,
Reserved1, TargetDataRep, pInput, Reserved2, phNewContext, pOutput, pfContextAttr, ptsExpiry);
if (pszTargetNameW != NULL)
free(pszTargetNameW);
return status;
}
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375354 */
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;
}
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa379337/ */
SECURITY_STATUS SEC_ENTRY ntlm_QueryContextAttributesW(PCtxtHandle phContext, ULONG ulAttribute, void* pBuffer)
{
if (!phContext)
return SEC_E_INVALID_HANDLE;
if (!pBuffer)
return SEC_E_INSUFFICIENT_MEMORY;
if (ulAttribute == SECPKG_ATTR_SIZES)
{
SecPkgContext_Sizes* ContextSizes = (SecPkgContext_Sizes*) pBuffer;
ContextSizes->cbMaxToken = 2010;
ContextSizes->cbMaxSignature = 16;
ContextSizes->cbBlockSize = 0;
ContextSizes->cbSecurityTrailer = 16;
return SEC_E_OK;
}
return SEC_E_UNSUPPORTED_FUNCTION;
}
SECURITY_STATUS SEC_ENTRY ntlm_QueryContextAttributesA(PCtxtHandle phContext, ULONG ulAttribute, void* pBuffer)
{
return ntlm_QueryContextAttributesW(phContext, ulAttribute, pBuffer);
}
SECURITY_STATUS SEC_ENTRY ntlm_RevertSecurityContext(PCtxtHandle phContext)
{
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_EncryptMessage(PCtxtHandle phContext, ULONG fQOP, PSecBufferDesc pMessage, ULONG MessageSeqNo)
{
int index;
int length;
void* data;
UINT32 SeqNo;
HMAC_CTX hmac;
BYTE digest[16];
BYTE checksum[8];
BYTE* signature;
ULONG version = 1;
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);
CopyMemory(data, data_buffer->pvBuffer, length);
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,data) using the client signing key */
HMAC_CTX_init(&hmac);
HMAC_Init_ex(&hmac, context->SendSigningKey, 16, EVP_md5(), NULL);
HMAC_Update(&hmac, (void*) &(SeqNo), 4);
HMAC_Update(&hmac, data, length);
HMAC_Final(&hmac, digest, NULL);
HMAC_CTX_cleanup(&hmac);
/* Encrypt message using with RC4, result overwrites original buffer */
if (context->confidentiality)
RC4(&context->SendRc4Seal, length, data, data_buffer->pvBuffer);
else
CopyMemory(data_buffer->pvBuffer, data, length);
#ifdef WITH_DEBUG_NTLM
printf("Data Buffer (length = %d)\n", length);
winpr_HexDump(data, length);
printf("\n");
printf("Encrypted Data Buffer (length = %d)\n", (int) data_buffer->cbBuffer);
winpr_HexDump(data_buffer->pvBuffer, data_buffer->cbBuffer);
printf("\n");
#endif
free(data);
/* RC4-encrypt first 8 bytes of digest */
RC4(&context->SendRc4Seal, 8, digest, checksum);
signature = (BYTE*) signature_buffer->pvBuffer;
/* Concatenate version, ciphertext and sequence number to build signature */
CopyMemory(signature, (void*) &version, 4);
CopyMemory(&signature[4], (void*) checksum, 8);
CopyMemory(&signature[12], (void*) &(SeqNo), 4);
context->SendSeqNum++;
#ifdef WITH_DEBUG_NTLM
printf("Signature (length = %d)\n", (int) signature_buffer->cbBuffer);
winpr_HexDump(signature_buffer->pvBuffer, signature_buffer->cbBuffer);
printf("\n");
#endif
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_DecryptMessage(PCtxtHandle phContext, PSecBufferDesc pMessage, ULONG MessageSeqNo, PULONG pfQOP)
{
int index;
int length;
void* data;
UINT32 SeqNo;
HMAC_CTX hmac;
BYTE digest[16];
BYTE checksum[8];
UINT32 version = 1;
NTLM_CONTEXT* context;
BYTE expected_signature[16];
PSecBuffer data_buffer = NULL;
PSecBuffer signature_buffer = NULL;
SeqNo = (UINT32) MessageSeqNo;
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);
CopyMemory(data, data_buffer->pvBuffer, length);
/* Decrypt message using with RC4, result overwrites original buffer */
if (context->confidentiality)
RC4(&context->RecvRc4Seal, length, data, 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_CTX_init(&hmac);
HMAC_Init_ex(&hmac, context->RecvSigningKey, 16, EVP_md5(), NULL);
HMAC_Update(&hmac, (void*) &(SeqNo), 4);
HMAC_Update(&hmac, data_buffer->pvBuffer, data_buffer->cbBuffer);
HMAC_Final(&hmac, digest, NULL);
HMAC_CTX_cleanup(&hmac);
#ifdef WITH_DEBUG_NTLM
printf("Encrypted Data Buffer (length = %d)\n", length);
winpr_HexDump(data, length);
printf("\n");
printf("Data Buffer (length = %d)\n", (int) data_buffer->cbBuffer);
winpr_HexDump(data_buffer->pvBuffer, data_buffer->cbBuffer);
printf("\n");
#endif
free(data);
/* RC4-encrypt first 8 bytes of digest */
RC4(&context->RecvRc4Seal, 8, digest, checksum);
/* Concatenate version, ciphertext and sequence number to build signature */
CopyMemory(expected_signature, (void*) &version, 4);
CopyMemory(&expected_signature[4], (void*) checksum, 8);
CopyMemory(&expected_signature[12], (void*) &(SeqNo), 4);
context->RecvSeqNum++;
if (memcmp(signature_buffer->pvBuffer, expected_signature, 16) != 0)
{
/* signature verification failed! */
printf("signature verification failed, something nasty is going on!\n");
printf("Expected Signature:\n");
winpr_HexDump(expected_signature, 16);
printf("Actual Signature:\n");
winpr_HexDump(signature_buffer->pvBuffer, 16);
return SEC_E_MESSAGE_ALTERED;
}
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_MakeSignature(PCtxtHandle phContext, ULONG fQOP, PSecBufferDesc pMessage, ULONG MessageSeqNo)
{
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY ntlm_VerifySignature(PCtxtHandle phContext, PSecBufferDesc pMessage, ULONG MessageSeqNo, PULONG pfQOP)
{
return SEC_E_OK;
}
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 */
NULL, /* 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 */
NULL, /* 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 */
NULL, /* 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 */
NULL, /* SetContextAttributes */
};
const SecPkgInfoA NTLM_SecPkgInfoA =
{
0x00082B37, /* fCapabilities */
1, /* wVersion */
0x000A, /* wRPCID */
0x00000B48, /* cbMaxToken */
"NTLM", /* Name */
"NTLM Security Package" /* Comment */
};
WCHAR NTLM_SecPkgInfoW_Name[] = { 'N','T','L','M','\0' };
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 */
};