651 lines
18 KiB
C
651 lines
18 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* NTLM Security Package
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*
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* Copyright 2011-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <time.h>
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#include <openssl/des.h>
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#include <openssl/md4.h>
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#include <openssl/hmac.h>
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#include <openssl/rand.h>
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#include <openssl/engine.h>
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#include <freerdp/utils/memory.h>
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#include <freerdp/sspi/sspi.h>
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#include "ntlm.h"
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#include "../sspi.h"
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#include "ntlm_message.h"
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char* NTLM_PACKAGE_NAME = "NTLM";
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void ntlm_SetContextIdentity(NTLM_CONTEXT* context, SEC_WINNT_AUTH_IDENTITY* identity)
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{
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size_t size;
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context->identity.Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;
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if (identity->Flags == SEC_WINNT_AUTH_IDENTITY_ANSI)
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{
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context->identity.User = (uint16*) freerdp_uniconv_out(context->uniconv, (char*) identity->User, &size);
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context->identity.UserLength = (uint32) size;
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if (identity->DomainLength > 0)
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{
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context->identity.Domain = (uint16*) freerdp_uniconv_out(context->uniconv, (char*) identity->Domain, &size);
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context->identity.DomainLength = (uint32) size;
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}
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else
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{
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context->identity.Domain = (uint16*) NULL;
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context->identity.DomainLength = 0;
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}
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context->identity.Password = (uint16*) freerdp_uniconv_out(context->uniconv, (char*) identity->Password, &size);
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context->identity.PasswordLength = (uint32) size;
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}
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else
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{
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context->identity.User = (uint16*) xmalloc(identity->UserLength);
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memcpy(context->identity.User, identity->User, identity->UserLength);
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context->identity.UserLength = identity->UserLength;
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if (identity->DomainLength > 0)
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{
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context->identity.Domain = (uint16*) xmalloc(identity->DomainLength);
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memcpy(context->identity.Domain, identity->Domain, identity->DomainLength);
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context->identity.DomainLength = identity->DomainLength;
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}
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else
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{
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context->identity.Domain = (uint16*) NULL;
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context->identity.DomainLength = 0;
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}
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context->identity.Password = (uint16*) xmalloc(identity->PasswordLength);
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memcpy(context->identity.Password, identity->Password, identity->PasswordLength);
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context->identity.PasswordLength = identity->PasswordLength;
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}
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}
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void ntlm_SetContextWorkstation(NTLM_CONTEXT* context, char* Workstation)
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{
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size_t size;
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context->Workstation = (uint16*) freerdp_uniconv_out(context->uniconv, Workstation, &size);
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context->WorkstationLength = (uint32) size;
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}
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void ntlm_SetContextTargetName(NTLM_CONTEXT* context, char* TargetName)
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{
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size_t size;
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context->TargetName.pvBuffer = (uint16*) freerdp_uniconv_out(context->uniconv, TargetName, &size);
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context->TargetName.cbBuffer = (uint32) size;
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}
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NTLM_CONTEXT* ntlm_ContextNew()
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{
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NTLM_CONTEXT* context;
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context = xnew(NTLM_CONTEXT);
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if (context != NULL)
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{
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context->ntlm_v2 = false;
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context->NegotiateFlags = 0;
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context->state = NTLM_STATE_INITIAL;
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context->uniconv = freerdp_uniconv_new();
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context->av_pairs = (AV_PAIRS*) xzalloc(sizeof(AV_PAIRS));
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}
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return context;
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}
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void ntlm_ContextFree(NTLM_CONTEXT* context)
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{
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if (!context)
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return;
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freerdp_uniconv_free(context->uniconv);
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crypto_rc4_free(context->SendRc4Seal);
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crypto_rc4_free(context->RecvRc4Seal);
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sspi_SecBufferFree(&context->NegotiateMessage);
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sspi_SecBufferFree(&context->ChallengeMessage);
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sspi_SecBufferFree(&context->AuthenticateMessage);
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sspi_SecBufferFree(&context->TargetInfo);
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sspi_SecBufferFree(&context->TargetName);
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sspi_SecBufferFree(&context->NtChallengeResponse);
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sspi_SecBufferFree(&context->LmChallengeResponse);
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xfree(context->identity.User);
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xfree(context->identity.Password);
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xfree(context->identity.Domain);
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xfree(context->Workstation);
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xfree(context->av_pairs->Timestamp.value);
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xfree(context->av_pairs);
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xfree(context);
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}
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SECURITY_STATUS ntlm_AcquireCredentialsHandle(char* pszPrincipal, char* pszPackage,
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uint32 fCredentialUse, void* pvLogonID, void* pAuthData, void* pGetKeyFn,
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void* pvGetKeyArgument, CredHandle* phCredential, TimeStamp* ptsExpiry)
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{
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CREDENTIALS* credentials;
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SEC_WINNT_AUTH_IDENTITY* identity;
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if (fCredentialUse == SECPKG_CRED_OUTBOUND)
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{
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credentials = sspi_CredentialsNew();
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identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
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memcpy(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
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sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
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sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
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return SEC_E_OK;
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}
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else if (fCredentialUse == SECPKG_CRED_INBOUND)
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{
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credentials = sspi_CredentialsNew();
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identity = (SEC_WINNT_AUTH_IDENTITY*) pAuthData;
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memcpy(&(credentials->identity), identity, sizeof(SEC_WINNT_AUTH_IDENTITY));
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sspi_SecureHandleSetLowerPointer(phCredential, (void*) credentials);
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sspi_SecureHandleSetUpperPointer(phCredential, (void*) NTLM_PACKAGE_NAME);
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return SEC_E_OK;
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}
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return SEC_E_OK;
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}
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SECURITY_STATUS ntlm_FreeCredentialsHandle(CredHandle* phCredential)
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{
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CREDENTIALS* credentials;
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if (!phCredential)
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return SEC_E_INVALID_HANDLE;
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credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
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if (!credentials)
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return SEC_E_INVALID_HANDLE;
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sspi_CredentialsFree(credentials);
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return SEC_E_OK;
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}
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SECURITY_STATUS ntlm_QueryCredentialsAttributes(CredHandle* phCredential, uint32 ulAttribute, void* pBuffer)
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{
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if (ulAttribute == SECPKG_CRED_ATTR_NAMES)
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{
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CREDENTIALS* credentials;
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SecPkgCredentials_Names* credential_names = (SecPkgCredentials_Names*) pBuffer;
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credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
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if (credentials->identity.Flags == SEC_WINNT_AUTH_IDENTITY_ANSI)
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credential_names->sUserName = xstrdup((char*) credentials->identity.User);
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return SEC_E_OK;
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}
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return SEC_E_UNSUPPORTED_FUNCTION;
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}
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/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375512/ */
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SECURITY_STATUS ntlm_AcceptSecurityContext(CredHandle* phCredential, CtxtHandle* phContext,
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SecBufferDesc* pInput, uint32 fContextReq, uint32 TargetDataRep, CtxtHandle* phNewContext,
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SecBufferDesc* pOutput, uint32* pfContextAttr, TimeStamp* ptsTimeStamp)
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{
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NTLM_CONTEXT* context;
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SECURITY_STATUS status;
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CREDENTIALS* credentials;
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SecBuffer* input_buffer;
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SecBuffer* output_buffer;
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context = sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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{
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context = ntlm_ContextNew();
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context->server = true;
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credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
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ntlm_SetContextIdentity(context, &credentials->identity);
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ntlm_SetContextTargetName(context, "FreeRDP");
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sspi_SecureHandleSetLowerPointer(phNewContext, context);
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sspi_SecureHandleSetUpperPointer(phNewContext, (void*) NTLM_PACKAGE_NAME);
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}
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if (context->state == NTLM_STATE_INITIAL)
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{
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context->state = NTLM_STATE_NEGOTIATE;
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if (!context)
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return SEC_E_INVALID_HANDLE;
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if (!pInput)
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return SEC_E_INVALID_TOKEN;
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if (pInput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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input_buffer = &pInput->pBuffers[0];
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if (input_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (input_buffer->cbBuffer < 1)
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return SEC_E_INVALID_TOKEN;
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status = ntlm_read_NegotiateMessage(context, input_buffer);
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if (context->state == NTLM_STATE_CHALLENGE)
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{
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if (!pOutput)
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return SEC_E_INVALID_TOKEN;
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if (pOutput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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output_buffer = &pOutput->pBuffers[0];
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if (output_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (output_buffer->cbBuffer < 1)
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return SEC_E_INSUFFICIENT_MEMORY;
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return ntlm_write_ChallengeMessage(context, output_buffer);
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}
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return SEC_E_OUT_OF_SEQUENCE;
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}
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else if (context->state == NTLM_STATE_AUTHENTICATE)
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{
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if (!context)
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return SEC_E_INVALID_HANDLE;
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if (!pInput)
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return SEC_E_INVALID_TOKEN;
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if (pInput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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input_buffer = &pInput->pBuffers[0];
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if (input_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (input_buffer->cbBuffer < 1)
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return SEC_E_INVALID_TOKEN;
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status = ntlm_read_AuthenticateMessage(context, input_buffer);
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return status;
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}
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return SEC_E_OUT_OF_SEQUENCE;
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}
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SECURITY_STATUS ntlm_ImpersonateSecurityContext(CtxtHandle* phContext)
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{
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return SEC_E_OK;
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}
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SECURITY_STATUS ntlm_InitializeSecurityContext(CredHandle* phCredential, CtxtHandle* phContext,
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char* pszTargetName, uint32 fContextReq, uint32 Reserved1, uint32 TargetDataRep,
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SecBufferDesc* pInput, uint32 Reserved2, CtxtHandle* phNewContext,
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SecBufferDesc* pOutput, uint32* pfContextAttr, TimeStamp* ptsExpiry)
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{
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NTLM_CONTEXT* context;
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SECURITY_STATUS status;
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CREDENTIALS* credentials;
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SecBuffer* input_buffer;
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SecBuffer* output_buffer;
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context = sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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{
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context = ntlm_ContextNew();
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credentials = (CREDENTIALS*) sspi_SecureHandleGetLowerPointer(phCredential);
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ntlm_SetContextIdentity(context, &credentials->identity);
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ntlm_SetContextWorkstation(context, "WORKSTATION");
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sspi_SecureHandleSetLowerPointer(phNewContext, context);
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sspi_SecureHandleSetUpperPointer(phNewContext, (void*) NTLM_PACKAGE_NAME);
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}
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if ((!pInput) || (context->state == NTLM_STATE_AUTHENTICATE))
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{
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if (!pOutput)
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return SEC_E_INVALID_TOKEN;
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if (pOutput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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output_buffer = &pOutput->pBuffers[0];
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if (output_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (output_buffer->cbBuffer < 1)
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return SEC_E_INSUFFICIENT_MEMORY;
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if (context->state == NTLM_STATE_INITIAL)
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context->state = NTLM_STATE_NEGOTIATE;
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if (context->state == NTLM_STATE_NEGOTIATE)
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return ntlm_write_NegotiateMessage(context, output_buffer);
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return SEC_E_OUT_OF_SEQUENCE;
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}
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else
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{
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if (!context)
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return SEC_E_INVALID_HANDLE;
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if (!pInput)
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return SEC_E_INVALID_TOKEN;
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if (pInput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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input_buffer = &pInput->pBuffers[0];
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if (input_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (input_buffer->cbBuffer < 1)
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return SEC_E_INVALID_TOKEN;
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if (context->state == NTLM_STATE_CHALLENGE)
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{
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status = ntlm_read_ChallengeMessage(context, input_buffer);
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if (!pOutput)
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return SEC_E_INVALID_TOKEN;
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if (pOutput->cBuffers < 1)
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return SEC_E_INVALID_TOKEN;
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output_buffer = &pOutput->pBuffers[0];
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if (output_buffer->BufferType != SECBUFFER_TOKEN)
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return SEC_E_INVALID_TOKEN;
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if (output_buffer->cbBuffer < 1)
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return SEC_E_INSUFFICIENT_MEMORY;
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if (context->state == NTLM_STATE_AUTHENTICATE)
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return ntlm_write_AuthenticateMessage(context, output_buffer);
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}
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return SEC_E_OUT_OF_SEQUENCE;
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}
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return SEC_E_OUT_OF_SEQUENCE;
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}
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/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375354 */
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SECURITY_STATUS ntlm_DeleteSecurityContext(CtxtHandle* phContext)
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{
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NTLM_CONTEXT* context;
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context = sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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return SEC_E_INVALID_HANDLE;
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ntlm_ContextFree(context);
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return SEC_E_OK;
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}
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/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa379337/ */
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SECURITY_STATUS ntlm_QueryContextAttributes(CtxtHandle* phContext, uint32 ulAttribute, void* pBuffer)
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{
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if (!phContext)
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return SEC_E_INVALID_HANDLE;
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if (!pBuffer)
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return SEC_E_INSUFFICIENT_MEMORY;
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if (ulAttribute == SECPKG_ATTR_SIZES)
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{
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SecPkgContext_Sizes* ContextSizes = (SecPkgContext_Sizes*) pBuffer;
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ContextSizes->cbMaxToken = 2010;
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ContextSizes->cbMaxSignature = 16;
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ContextSizes->cbBlockSize = 0;
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ContextSizes->cbSecurityTrailer = 16;
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return SEC_E_OK;
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}
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return SEC_E_UNSUPPORTED_FUNCTION;
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}
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SECURITY_STATUS ntlm_RevertSecurityContext(CtxtHandle* phContext)
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{
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return SEC_E_OK;
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}
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SECURITY_STATUS ntlm_EncryptMessage(CtxtHandle* phContext, uint32 fQOP, SecBufferDesc* pMessage, uint32 MessageSeqNo)
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{
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int index;
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int length;
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void* data;
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HMAC_CTX hmac;
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uint8 digest[16];
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uint8 checksum[8];
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uint8* signature;
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uint32 version = 1;
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NTLM_CONTEXT* context;
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SecBuffer* data_buffer = NULL;
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SecBuffer* signature_buffer = NULL;
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context = sspi_SecureHandleGetLowerPointer(phContext);
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for (index = 0; index < (int) pMessage->cBuffers; index++)
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{
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if (pMessage->pBuffers[index].BufferType == SECBUFFER_DATA)
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data_buffer = &pMessage->pBuffers[index];
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else if (pMessage->pBuffers[index].BufferType == SECBUFFER_PADDING)
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signature_buffer = &pMessage->pBuffers[index];
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}
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if (!data_buffer)
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return SEC_E_INVALID_TOKEN;
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if (!signature_buffer)
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return SEC_E_INVALID_TOKEN;
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/* Copy original data buffer */
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length = data_buffer->cbBuffer;
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data = xmalloc(length);
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memcpy(data, data_buffer->pvBuffer, length);
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/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,data) using the client signing key */
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HMAC_CTX_init(&hmac);
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HMAC_Init_ex(&hmac, context->SendSigningKey, 16, EVP_md5(), NULL);
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HMAC_Update(&hmac, (void*) &(MessageSeqNo), 4);
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HMAC_Update(&hmac, data, length);
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HMAC_Final(&hmac, digest, NULL);
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HMAC_CTX_cleanup(&hmac);
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/* Encrypt message using with RC4, result overwrites original buffer */
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crypto_rc4(context->SendRc4Seal, length, data, data_buffer->pvBuffer);
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xfree(data);
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#ifdef WITH_DEBUG_NTLM
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printf("Data Buffer (length = %d)\n", length);
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freerdp_hexdump(data, length);
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printf("\n");
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printf("Encrypted Data Buffer (length = %d)\n", data_buffer->cbBuffer);
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freerdp_hexdump(data_buffer->pvBuffer, data_buffer->cbBuffer);
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printf("\n");
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#endif
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/* RC4-encrypt first 8 bytes of digest */
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crypto_rc4(context->SendRc4Seal, 8, digest, checksum);
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signature = (uint8*) signature_buffer->pvBuffer;
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|
|
/* Concatenate version, ciphertext and sequence number to build signature */
|
|
memcpy(signature, (void*) &version, 4);
|
|
memcpy(&signature[4], (void*) checksum, 8);
|
|
memcpy(&signature[12], (void*) &(MessageSeqNo), 4);
|
|
context->SendSeqNum++;
|
|
|
|
#ifdef WITH_DEBUG_NTLM
|
|
printf("Signature (length = %d)\n", signature_buffer->cbBuffer);
|
|
freerdp_hexdump(signature_buffer->pvBuffer, signature_buffer->cbBuffer);
|
|
printf("\n");
|
|
#endif
|
|
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS ntlm_DecryptMessage(CtxtHandle* phContext, SecBufferDesc* pMessage, uint32 MessageSeqNo, uint32* pfQOP)
|
|
{
|
|
int index;
|
|
int length;
|
|
void* data;
|
|
HMAC_CTX hmac;
|
|
uint8 digest[16];
|
|
uint8 checksum[8];
|
|
uint32 version = 1;
|
|
NTLM_CONTEXT* context;
|
|
uint8 expected_signature[16];
|
|
SecBuffer* data_buffer = NULL;
|
|
SecBuffer* signature_buffer = NULL;
|
|
|
|
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_PADDING)
|
|
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 = xmalloc(length);
|
|
memcpy(data, data_buffer->pvBuffer, length);
|
|
|
|
/* Decrypt message using with RC4 */
|
|
crypto_rc4(context->RecvRc4Seal, length, data, data_buffer->pvBuffer);
|
|
|
|
/* 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*) &(MessageSeqNo), 4);
|
|
HMAC_Update(&hmac, data_buffer->pvBuffer, data_buffer->cbBuffer);
|
|
HMAC_Final(&hmac, digest, NULL);
|
|
HMAC_CTX_cleanup(&hmac);
|
|
xfree(data);
|
|
|
|
/* RC4-encrypt first 8 bytes of digest */
|
|
crypto_rc4(context->RecvRc4Seal, 8, digest, checksum);
|
|
|
|
/* Concatenate version, ciphertext and sequence number to build signature */
|
|
memcpy(expected_signature, (void*) &version, 4);
|
|
memcpy(&expected_signature[4], (void*) checksum, 8);
|
|
memcpy(&expected_signature[12], (void*) &(MessageSeqNo), 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");
|
|
return SEC_E_MESSAGE_ALTERED;
|
|
}
|
|
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS ntlm_MakeSignature(CtxtHandle* phContext, uint32 fQOP, SecBufferDesc* pMessage, uint32 MessageSeqNo)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
SECURITY_STATUS ntlm_VerifySignature(CtxtHandle* phContext, SecBufferDesc* pMessage, uint32 MessageSeqNo, uint32* pfQOP)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
const SecPkgInfo NTLM_SecPkgInfo =
|
|
{
|
|
0x00082B37, /* fCapabilities */
|
|
1, /* wVersion */
|
|
0x000A, /* wRPCID */
|
|
0x00000B48, /* cbMaxToken */
|
|
"NTLM", /* Name */
|
|
"NTLM Security Package" /* Comment */
|
|
};
|
|
|
|
const SecurityFunctionTable NTLM_SecurityFunctionTable =
|
|
{
|
|
1, /* dwVersion */
|
|
NULL, /* EnumerateSecurityPackages */
|
|
NULL, /* Reserved1 */
|
|
ntlm_QueryCredentialsAttributes, /* QueryCredentialsAttributes */
|
|
ntlm_AcquireCredentialsHandle, /* AcquireCredentialsHandle */
|
|
ntlm_FreeCredentialsHandle, /* FreeCredentialsHandle */
|
|
NULL, /* Reserved2 */
|
|
ntlm_InitializeSecurityContext, /* InitializeSecurityContext */
|
|
ntlm_AcceptSecurityContext, /* AcceptSecurityContext */
|
|
NULL, /* CompleteAuthToken */
|
|
ntlm_DeleteSecurityContext, /* DeleteSecurityContext */
|
|
NULL, /* ApplyControlToken */
|
|
ntlm_QueryContextAttributes, /* 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 */
|
|
};
|