DWORD
NtlmCreateValidatedContext(
IN PNTLM_RESPONSE_MESSAGE_V1 pNtlmRespMsg,
IN DWORD dwMsgSize,
IN PNTLM_CONTEXT pNtlmCtxtChlng,
IN PBYTE pSessionKey,
IN DWORD dwSessionKeyLen,
IN NTLM_CRED_HANDLE hCred,
OUT PNTLM_CONTEXT *ppNtlmContext
)
{
DWORD dwError = LW_ERROR_SUCCESS;
PNTLM_CONTEXT pNtlmContext = NULL;
SEC_CHAR* pUserName = NULL;
SEC_CHAR* pDomainName = NULL;
PNTLM_RESPONSE_MESSAGE_V2 pV2Message = NULL;
RC4_KEY Rc4Key;
*ppNtlmContext = NULL;
dwError = NtlmCreateContext(hCred, &pNtlmContext);
BAIL_ON_LSA_ERROR(dwError);
pNtlmContext->NtlmState = NtlmStateResponse;
pNtlmContext->NegotiatedFlags = pNtlmCtxtChlng->NegotiatedFlags;
dwError = LwAllocateStringPrintf(
&pNtlmContext->pszClientUsername,
"%s\\%s",
pNtlmCtxtChlng->pUserInfo->pszDomain,
pNtlmCtxtChlng->pUserInfo->pszAccount);
BAIL_ON_LSA_ERROR(dwError);
memcpy(pNtlmContext->SessionKey, pSessionKey, NTLM_SESSION_KEY_SIZE);
pNtlmContext->cbSessionKeyLen = dwSessionKeyLen;
pNtlmContext->bInitiatedSide = FALSE;
if (pNtlmContext->NegotiatedFlags & NTLM_FLAG_KEY_EXCH)
{
pV2Message = (PNTLM_RESPONSE_MESSAGE_V2)pNtlmRespMsg;
if (dwMsgSize < sizeof(*pV2Message))
{
dwError = ERROR_INVALID_PARAMETER;
BAIL_ON_LSA_ERROR(dwError);
}
if (LW_LTOH32(pV2Message->SessionKey.dwOffset) +
LW_LTOH16(pV2Message->SessionKey.usLength) > dwMsgSize)
{
dwError = ERROR_INVALID_PARAMETER;
BAIL_ON_LSA_ERROR(dwError);
}
if (LW_LTOH16(pV2Message->SessionKey.usLength) != NTLM_SESSION_KEY_SIZE)
{
dwError = ERROR_INVALID_PARAMETER;
BAIL_ON_LSA_ERROR(dwError);
}
RC4_set_key(
&Rc4Key,
pNtlmContext->cbSessionKeyLen,
pNtlmContext->SessionKey);
RC4(&Rc4Key,
NTLM_SESSION_KEY_SIZE,
LW_LTOH32(pV2Message->SessionKey.dwOffset) + (PBYTE)pV2Message,
pNtlmContext->SessionKey);
}
dwError = NtlmInitializeKeys(pNtlmContext);
BAIL_ON_LSA_ERROR(dwError);
cleanup:
LW_SAFE_FREE_MEMORY(pUserName);
LW_SAFE_FREE_MEMORY(pDomainName);
*ppNtlmContext = pNtlmContext;
return dwError;
error:
if (pNtlmContext)
{
NtlmFreeContext(&pNtlmContext);
}
goto cleanup;
}
DWORD
NtlmCreateResponseContext(
IN PNTLM_CHALLENGE_MESSAGE pChlngMsg,
IN NTLM_CRED_HANDLE hCred,
IN BOOLEAN bDoAnonymous,
OUT PNTLM_CONTEXT* ppNtlmContext,
OUT PSecBuffer pOutput
)
{
DWORD dwError = LW_ERROR_SUCCESS;
PNTLM_RESPONSE_MESSAGE_V1 pMessage = NULL;
PCSTR pUserNameTemp = NULL;
PCSTR pPassword = NULL;
PNTLM_CONTEXT pNtlmContext = NULL;
PBYTE pMasterKey = NULL;
BYTE LmUserSessionKey[NTLM_SESSION_KEY_SIZE] = {0};
BYTE NtlmUserSessionKey[NTLM_SESSION_KEY_SIZE] = {0};
BYTE LanManagerSessionKey[NTLM_SESSION_KEY_SIZE] = {0};
BYTE SecondaryKey[NTLM_SESSION_KEY_SIZE] = {0};
PLSA_LOGIN_NAME_INFO pUserNameInfo = NULL;
DWORD dwMessageSize = 0;
NTLM_CONFIG config;
DWORD dwNtRespType = 0;
DWORD dwLmRespType = 0;
*ppNtlmContext = NULL;
dwError = NtlmReadRegistry(&config);
BAIL_ON_LSA_ERROR(dwError);
if (bDoAnonymous)
{
pUserNameTemp = "";
pPassword = "";
}
else
{
NtlmGetCredentialInfo(
hCred,
&pUserNameTemp,
&pPassword,
NULL);
if (!pUserNameTemp[0] && !pPassword[0])
{
bDoAnonymous = TRUE;
}
}
if (bDoAnonymous)
{
dwError = LwAllocateMemory(
sizeof(*pUserNameInfo),
OUT_PPVOID(&pUserNameInfo));
BAIL_ON_LSA_ERROR(dwError);
dwError = LwAllocateString(
"",
&pUserNameInfo->pszName);
BAIL_ON_LSA_ERROR(dwError);
dwError = LwAllocateString(
"",
&pUserNameInfo->pszDomain);
BAIL_ON_LSA_ERROR(dwError);
}
else
{
dwError = LsaSrvCrackDomainQualifiedName(
pUserNameTemp,
&pUserNameInfo);
BAIL_ON_LSA_ERROR(dwError);
}
dwError = NtlmCreateContext(hCred, &pNtlmContext);
BAIL_ON_LSA_ERROR(dwError);
dwError = LwAllocateString(
pUserNameTemp,
&pNtlmContext->pszClientUsername);
BAIL_ON_LSA_ERROR(dwError);
if (bDoAnonymous)
{
dwNtRespType = NTLM_RESPONSE_TYPE_ANON_NTLM;
dwLmRespType = NTLM_RESPONSE_TYPE_ANON_LM;
}
else if (config.bSendNTLMv2)
{
dwNtRespType = NTLM_RESPONSE_TYPE_NTLMv2;
// TODO: the correct thing is to use LMv2
dwLmRespType = NTLM_RESPONSE_TYPE_LM;
}
else if(LW_LTOH32(pChlngMsg->NtlmFlags) & NTLM_FLAG_NTLM2)
{
dwLmRespType = NTLM_RESPONSE_TYPE_NTLM2;
dwNtRespType = NTLM_RESPONSE_TYPE_NTLM2;
}
else
{
dwNtRespType = NTLM_RESPONSE_TYPE_NTLM;
dwLmRespType = NTLM_RESPONSE_TYPE_LM;
}
dwError = NtlmCreateResponseMessage(
pChlngMsg,
pUserNameInfo->pszName,
pUserNameInfo->pszDomain,
pPassword,
(PBYTE)&gXpSpoof,
dwNtRespType,
dwLmRespType,
&dwMessageSize,
&pMessage,
LmUserSessionKey,
NtlmUserSessionKey
);
BAIL_ON_LSA_ERROR(dwError);
// As a side effect of creating the response, we must also set/produce the
// master session key...
pMasterKey = NtlmUserSessionKey;
if (LW_LTOH32(pChlngMsg->NtlmFlags) & NTLM_FLAG_LM_KEY)
{
NtlmGenerateLanManagerSessionKey(
pMessage,
LmUserSessionKey,
LanManagerSessionKey);
pMasterKey = LanManagerSessionKey;
}
if (LW_LTOH32(pChlngMsg->NtlmFlags) & NTLM_FLAG_KEY_EXCH)
{
// This is the key we will use for session security...
dwError = NtlmGetRandomBuffer(
SecondaryKey,
NTLM_SESSION_KEY_SIZE);
BAIL_ON_LSA_ERROR(dwError);
// Encrypt it with the "master key" set above and send it along with the
// response
NtlmStoreSecondaryKey(
pMasterKey,
SecondaryKey,
pMessage);
pMasterKey = SecondaryKey;
}
NtlmWeakenSessionKey(
pChlngMsg,
pMasterKey,
&pNtlmContext->cbSessionKeyLen);
memcpy(pNtlmContext->SessionKey, pMasterKey, NTLM_SESSION_KEY_SIZE);
pNtlmContext->NegotiatedFlags = LW_LTOH32(pChlngMsg->NtlmFlags);
pOutput->cbBuffer = dwMessageSize;
pOutput->BufferType = SECBUFFER_TOKEN;
pOutput->pvBuffer = pMessage;
pNtlmContext->NtlmState = NtlmStateResponse;
pNtlmContext->bInitiatedSide = TRUE;
pNtlmContext->bDoAnonymous = bDoAnonymous;
dwError = NtlmInitializeKeys(pNtlmContext);
BAIL_ON_LSA_ERROR(dwError);
cleanup:
if (pUserNameInfo)
{
LsaSrvFreeNameInfo(pUserNameInfo);
}
*ppNtlmContext = pNtlmContext;
return dwError;
error:
LW_SAFE_FREE_MEMORY(pMessage);
if (pNtlmContext)
{
NtlmFreeContext(&pNtlmContext);
}
pOutput->cbBuffer = 0;
pOutput->BufferType = 0;
pOutput->pvBuffer = NULL;
goto cleanup;
}
