Milestone 5: deliver embedded RDP sessions and lifecycle hardening
This commit is contained in:
Keith Smith
475
third_party/FreeRDP/winpr/libwinpr/sspi/Schannel/schannel.c
vendored
Normal file
475
third_party/FreeRDP/winpr/libwinpr/sspi/Schannel/schannel.c
vendored
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@@ -0,0 +1,475 @@
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/**
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* WinPR: Windows Portable Runtime
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* Schannel Security Package
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*
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* Copyright 2012-2014 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 <winpr/config.h>
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#include <winpr/crt.h>
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#include <winpr/sspi.h>
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#include "schannel.h"
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#include "../sspi.h"
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#include "../../log.h"
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static char* SCHANNEL_PACKAGE_NAME = "Schannel";
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#define TAG WINPR_TAG("sspi.Schannel")
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SCHANNEL_CONTEXT* schannel_ContextNew(void)
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{
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SCHANNEL_CONTEXT* context = nullptr;
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context = (SCHANNEL_CONTEXT*)calloc(1, sizeof(SCHANNEL_CONTEXT));
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if (!context)
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return nullptr;
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context->openssl = schannel_openssl_new();
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if (!context->openssl)
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{
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free(context);
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return nullptr;
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}
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return context;
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}
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void schannel_ContextFree(SCHANNEL_CONTEXT* context)
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{
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if (!context)
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return;
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schannel_openssl_free(context->openssl);
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free(context);
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}
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static SCHANNEL_CREDENTIALS* schannel_CredentialsNew(void)
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{
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SCHANNEL_CREDENTIALS* credentials = nullptr;
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credentials = (SCHANNEL_CREDENTIALS*)calloc(1, sizeof(SCHANNEL_CREDENTIALS));
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return credentials;
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}
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static void schannel_CredentialsFree(SCHANNEL_CREDENTIALS* credentials)
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{
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free(credentials);
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}
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static ALG_ID schannel_SupportedAlgs[] = { CALG_AES_128,
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CALG_AES_256,
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CALG_RC4,
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CALG_DES,
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CALG_3DES,
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CALG_MD5,
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CALG_SHA1,
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CALG_SHA_256,
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CALG_SHA_384,
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CALG_SHA_512,
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CALG_RSA_SIGN,
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CALG_DH_EPHEM,
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(ALG_CLASS_KEY_EXCHANGE | ALG_TYPE_RESERVED7 |
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6), /* what is this? */
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CALG_DSS_SIGN,
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CALG_ECDSA };
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static SECURITY_STATUS SEC_ENTRY schannel_QueryCredentialsAttributesW(
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WINPR_ATTR_UNUSED PCredHandle phCredential, ULONG ulAttribute, void* pBuffer)
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{
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if (ulAttribute == SECPKG_ATTR_SUPPORTED_ALGS)
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{
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PSecPkgCred_SupportedAlgs SupportedAlgs = (PSecPkgCred_SupportedAlgs)pBuffer;
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SupportedAlgs->cSupportedAlgs = sizeof(schannel_SupportedAlgs) / sizeof(ALG_ID);
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SupportedAlgs->palgSupportedAlgs = (ALG_ID*)schannel_SupportedAlgs;
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return SEC_E_OK;
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}
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else if (ulAttribute == SECPKG_ATTR_CIPHER_STRENGTHS)
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{
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PSecPkgCred_CipherStrengths CipherStrengths = (PSecPkgCred_CipherStrengths)pBuffer;
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CipherStrengths->dwMinimumCipherStrength = 40;
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CipherStrengths->dwMaximumCipherStrength = 256;
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return SEC_E_OK;
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}
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else if (ulAttribute == SECPKG_ATTR_SUPPORTED_PROTOCOLS)
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{
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PSecPkgCred_SupportedProtocols SupportedProtocols = (PSecPkgCred_SupportedProtocols)pBuffer;
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/* Observed SupportedProtocols: 0x208A0 */
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SupportedProtocols->grbitProtocol = (SP_PROT_CLIENTS | SP_PROT_SERVERS);
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return SEC_E_OK;
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}
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WLog_ERR(TAG, "TODO: Implement ulAttribute=%08" PRIx32, ulAttribute);
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return SEC_E_UNSUPPORTED_FUNCTION;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_QueryCredentialsAttributesA(PCredHandle phCredential,
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ULONG ulAttribute,
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void* pBuffer)
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{
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return schannel_QueryCredentialsAttributesW(phCredential, ulAttribute, pBuffer);
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}
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static SECURITY_STATUS SEC_ENTRY schannel_AcquireCredentialsHandleW(
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WINPR_ATTR_UNUSED SEC_WCHAR* pszPrincipal, WINPR_ATTR_UNUSED SEC_WCHAR* pszPackage,
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ULONG fCredentialUse, WINPR_ATTR_UNUSED void* pvLogonID, void* pAuthData,
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WINPR_ATTR_UNUSED SEC_GET_KEY_FN pGetKeyFn, WINPR_ATTR_UNUSED void* pvGetKeyArgument,
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PCredHandle phCredential, WINPR_ATTR_UNUSED PTimeStamp ptsExpiry)
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{
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SCHANNEL_CREDENTIALS* credentials = nullptr;
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if (fCredentialUse == SECPKG_CRED_OUTBOUND)
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{
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SCHANNEL_CRED* cred = nullptr;
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credentials = schannel_CredentialsNew();
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credentials->fCredentialUse = fCredentialUse;
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cred = (SCHANNEL_CRED*)pAuthData;
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if (cred)
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{
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CopyMemory(&credentials->cred, cred, sizeof(SCHANNEL_CRED));
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}
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sspi_SecureHandleSetLowerPointer(phCredential, (void*)credentials);
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sspi_SecureHandleSetUpperPointer(phCredential, (void*)SCHANNEL_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 = schannel_CredentialsNew();
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credentials->fCredentialUse = fCredentialUse;
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sspi_SecureHandleSetLowerPointer(phCredential, (void*)credentials);
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sspi_SecureHandleSetUpperPointer(phCredential, (void*)SCHANNEL_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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static SECURITY_STATUS SEC_ENTRY schannel_AcquireCredentialsHandleA(
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SEC_CHAR* pszPrincipal, SEC_CHAR* pszPackage, ULONG fCredentialUse, void* pvLogonID,
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void* pAuthData, SEC_GET_KEY_FN pGetKeyFn, void* pvGetKeyArgument, PCredHandle phCredential,
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PTimeStamp ptsExpiry)
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{
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SECURITY_STATUS status = 0;
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SEC_WCHAR* pszPrincipalW = nullptr;
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SEC_WCHAR* pszPackageW = nullptr;
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if (pszPrincipal)
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pszPrincipalW = ConvertUtf8ToWCharAlloc(pszPrincipal, nullptr);
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if (pszPackage)
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pszPackageW = ConvertUtf8ToWCharAlloc(pszPackage, nullptr);
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status = schannel_AcquireCredentialsHandleW(pszPrincipalW, pszPackageW, fCredentialUse,
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pvLogonID, pAuthData, pGetKeyFn, pvGetKeyArgument,
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phCredential, ptsExpiry);
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free(pszPrincipalW);
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free(pszPackageW);
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return status;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_FreeCredentialsHandle(PCredHandle phCredential)
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{
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SCHANNEL_CREDENTIALS* credentials = nullptr;
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if (!phCredential)
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return SEC_E_INVALID_HANDLE;
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credentials = (SCHANNEL_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
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if (!credentials)
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return SEC_E_INVALID_HANDLE;
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schannel_CredentialsFree(credentials);
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return SEC_E_OK;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_InitializeSecurityContextW(
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PCredHandle phCredential, PCtxtHandle phContext, WINPR_ATTR_UNUSED SEC_WCHAR* pszTargetName,
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WINPR_ATTR_UNUSED ULONG fContextReq, WINPR_ATTR_UNUSED ULONG Reserved1,
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WINPR_ATTR_UNUSED ULONG TargetDataRep, PSecBufferDesc pInput, WINPR_ATTR_UNUSED ULONG Reserved2,
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PCtxtHandle phNewContext, PSecBufferDesc pOutput, WINPR_ATTR_UNUSED PULONG pfContextAttr,
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WINPR_ATTR_UNUSED PTimeStamp ptsExpiry)
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{
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SECURITY_STATUS status = 0;
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SCHANNEL_CONTEXT* context = nullptr;
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SCHANNEL_CREDENTIALS* credentials = nullptr;
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/* behave like windows SSPIs that don't want empty context */
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if (phContext && !phContext->dwLower && !phContext->dwUpper)
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return SEC_E_INVALID_HANDLE;
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context = sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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{
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context = schannel_ContextNew();
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if (!context)
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return SEC_E_INSUFFICIENT_MEMORY;
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credentials = (SCHANNEL_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
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context->server = FALSE;
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CopyMemory(&context->cred, &credentials->cred, sizeof(SCHANNEL_CRED));
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sspi_SecureHandleSetLowerPointer(phNewContext, context);
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sspi_SecureHandleSetUpperPointer(phNewContext, (void*)SCHANNEL_PACKAGE_NAME);
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schannel_openssl_client_init(context->openssl);
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}
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status = schannel_openssl_client_process_tokens(context->openssl, pInput, pOutput);
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return status;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_InitializeSecurityContextA(
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PCredHandle phCredential, PCtxtHandle phContext, SEC_CHAR* pszTargetName, ULONG fContextReq,
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ULONG Reserved1, ULONG TargetDataRep, PSecBufferDesc pInput, ULONG Reserved2,
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PCtxtHandle phNewContext, PSecBufferDesc pOutput, PULONG pfContextAttr, PTimeStamp ptsExpiry)
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{
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SECURITY_STATUS status = 0;
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SEC_WCHAR* pszTargetNameW = nullptr;
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if (pszTargetName != nullptr)
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{
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pszTargetNameW = ConvertUtf8ToWCharAlloc(pszTargetName, nullptr);
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if (!pszTargetNameW)
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return SEC_E_INSUFFICIENT_MEMORY;
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}
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status = schannel_InitializeSecurityContextW(
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phCredential, phContext, pszTargetNameW, fContextReq, Reserved1, TargetDataRep, pInput,
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Reserved2, phNewContext, pOutput, pfContextAttr, ptsExpiry);
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free(pszTargetNameW);
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return status;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_AcceptSecurityContext(
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WINPR_ATTR_UNUSED PCredHandle phCredential, PCtxtHandle phContext, PSecBufferDesc pInput,
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WINPR_ATTR_UNUSED ULONG fContextReq, WINPR_ATTR_UNUSED ULONG TargetDataRep,
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PCtxtHandle phNewContext, PSecBufferDesc pOutput, WINPR_ATTR_UNUSED PULONG pfContextAttr,
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WINPR_ATTR_UNUSED PTimeStamp ptsTimeStamp)
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{
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SECURITY_STATUS status = 0;
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SCHANNEL_CONTEXT* context = nullptr;
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/* behave like windows SSPIs that don't want empty context */
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if (phContext && !phContext->dwLower && !phContext->dwUpper)
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return SEC_E_INVALID_HANDLE;
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context = (SCHANNEL_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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{
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context = schannel_ContextNew();
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if (!context)
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return SEC_E_INSUFFICIENT_MEMORY;
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context->server = TRUE;
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sspi_SecureHandleSetLowerPointer(phNewContext, context);
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sspi_SecureHandleSetUpperPointer(phNewContext, (void*)SCHANNEL_PACKAGE_NAME);
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schannel_openssl_server_init(context->openssl);
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}
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status = schannel_openssl_server_process_tokens(context->openssl, pInput, pOutput);
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return status;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_DeleteSecurityContext(PCtxtHandle phContext)
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{
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SCHANNEL_CONTEXT* context = nullptr;
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context = (SCHANNEL_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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return SEC_E_INVALID_HANDLE;
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schannel_ContextFree(context);
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return SEC_E_OK;
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}
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static SECURITY_STATUS SEC_ENTRY schannel_QueryContextAttributes(PCtxtHandle phContext,
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ULONG 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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|
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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* Sizes = (SecPkgContext_Sizes*)pBuffer;
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Sizes->cbMaxToken = 0x6000;
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Sizes->cbMaxSignature = 16;
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Sizes->cbBlockSize = 0;
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Sizes->cbSecurityTrailer = 16;
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return SEC_E_OK;
|
||||
}
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else if (ulAttribute == SECPKG_ATTR_STREAM_SIZES)
|
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{
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||||
SecPkgContext_StreamSizes* StreamSizes = (SecPkgContext_StreamSizes*)pBuffer;
|
||||
StreamSizes->cbHeader = 5;
|
||||
StreamSizes->cbTrailer = 36;
|
||||
StreamSizes->cbMaximumMessage = 0x4000;
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||||
StreamSizes->cBuffers = 4;
|
||||
StreamSizes->cbBlockSize = 16;
|
||||
return SEC_E_OK;
|
||||
}
|
||||
|
||||
WLog_ERR(TAG, "TODO: Implement ulAttribute=%08" PRIx32, ulAttribute);
|
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return SEC_E_UNSUPPORTED_FUNCTION;
|
||||
}
|
||||
|
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static SECURITY_STATUS SEC_ENTRY schannel_MakeSignature(WINPR_ATTR_UNUSED PCtxtHandle phContext,
|
||||
WINPR_ATTR_UNUSED ULONG fQOP,
|
||||
WINPR_ATTR_UNUSED PSecBufferDesc pMessage,
|
||||
WINPR_ATTR_UNUSED ULONG MessageSeqNo)
|
||||
{
|
||||
return SEC_E_OK;
|
||||
}
|
||||
|
||||
static SECURITY_STATUS SEC_ENTRY schannel_VerifySignature(WINPR_ATTR_UNUSED PCtxtHandle phContext,
|
||||
WINPR_ATTR_UNUSED PSecBufferDesc pMessage,
|
||||
WINPR_ATTR_UNUSED ULONG MessageSeqNo,
|
||||
WINPR_ATTR_UNUSED ULONG* pfQOP)
|
||||
{
|
||||
return SEC_E_OK;
|
||||
}
|
||||
|
||||
static SECURITY_STATUS SEC_ENTRY schannel_EncryptMessage(WINPR_ATTR_UNUSED PCtxtHandle phContext,
|
||||
WINPR_ATTR_UNUSED ULONG fQOP,
|
||||
PSecBufferDesc pMessage,
|
||||
WINPR_ATTR_UNUSED ULONG MessageSeqNo)
|
||||
{
|
||||
SECURITY_STATUS status = 0;
|
||||
SCHANNEL_CONTEXT* context = nullptr;
|
||||
context = (SCHANNEL_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
|
||||
|
||||
if (!context)
|
||||
return SEC_E_INVALID_HANDLE;
|
||||
|
||||
status = schannel_openssl_encrypt_message(context->openssl, pMessage);
|
||||
return status;
|
||||
}
|
||||
|
||||
static SECURITY_STATUS SEC_ENTRY schannel_DecryptMessage(PCtxtHandle phContext,
|
||||
PSecBufferDesc pMessage,
|
||||
WINPR_ATTR_UNUSED ULONG MessageSeqNo,
|
||||
WINPR_ATTR_UNUSED ULONG* pfQOP)
|
||||
{
|
||||
SECURITY_STATUS status = 0;
|
||||
SCHANNEL_CONTEXT* context = nullptr;
|
||||
context = (SCHANNEL_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
|
||||
|
||||
if (!context)
|
||||
return SEC_E_INVALID_HANDLE;
|
||||
|
||||
status = schannel_openssl_decrypt_message(context->openssl, pMessage);
|
||||
return status;
|
||||
}
|
||||
|
||||
const SecurityFunctionTableA SCHANNEL_SecurityFunctionTableA = {
|
||||
3, /* dwVersion */
|
||||
nullptr, /* EnumerateSecurityPackages */
|
||||
schannel_QueryCredentialsAttributesA, /* QueryCredentialsAttributes */
|
||||
schannel_AcquireCredentialsHandleA, /* AcquireCredentialsHandle */
|
||||
schannel_FreeCredentialsHandle, /* FreeCredentialsHandle */
|
||||
nullptr, /* Reserved2 */
|
||||
schannel_InitializeSecurityContextA, /* InitializeSecurityContext */
|
||||
schannel_AcceptSecurityContext, /* AcceptSecurityContext */
|
||||
nullptr, /* CompleteAuthToken */
|
||||
schannel_DeleteSecurityContext, /* DeleteSecurityContext */
|
||||
nullptr, /* ApplyControlToken */
|
||||
schannel_QueryContextAttributes, /* QueryContextAttributes */
|
||||
nullptr, /* ImpersonateSecurityContext */
|
||||
nullptr, /* RevertSecurityContext */
|
||||
schannel_MakeSignature, /* MakeSignature */
|
||||
schannel_VerifySignature, /* VerifySignature */
|
||||
nullptr, /* FreeContextBuffer */
|
||||
nullptr, /* QuerySecurityPackageInfo */
|
||||
nullptr, /* Reserved3 */
|
||||
nullptr, /* Reserved4 */
|
||||
nullptr, /* ExportSecurityContext */
|
||||
nullptr, /* ImportSecurityContext */
|
||||
nullptr, /* AddCredentials */
|
||||
nullptr, /* Reserved8 */
|
||||
nullptr, /* QuerySecurityContextToken */
|
||||
schannel_EncryptMessage, /* EncryptMessage */
|
||||
schannel_DecryptMessage, /* DecryptMessage */
|
||||
nullptr, /* SetContextAttributes */
|
||||
nullptr, /* SetCredentialsAttributes */
|
||||
};
|
||||
|
||||
const SecurityFunctionTableW SCHANNEL_SecurityFunctionTableW = {
|
||||
3, /* dwVersion */
|
||||
nullptr, /* EnumerateSecurityPackages */
|
||||
schannel_QueryCredentialsAttributesW, /* QueryCredentialsAttributes */
|
||||
schannel_AcquireCredentialsHandleW, /* AcquireCredentialsHandle */
|
||||
schannel_FreeCredentialsHandle, /* FreeCredentialsHandle */
|
||||
nullptr, /* Reserved2 */
|
||||
schannel_InitializeSecurityContextW, /* InitializeSecurityContext */
|
||||
schannel_AcceptSecurityContext, /* AcceptSecurityContext */
|
||||
nullptr, /* CompleteAuthToken */
|
||||
schannel_DeleteSecurityContext, /* DeleteSecurityContext */
|
||||
nullptr, /* ApplyControlToken */
|
||||
schannel_QueryContextAttributes, /* QueryContextAttributes */
|
||||
nullptr, /* ImpersonateSecurityContext */
|
||||
nullptr, /* RevertSecurityContext */
|
||||
schannel_MakeSignature, /* MakeSignature */
|
||||
schannel_VerifySignature, /* VerifySignature */
|
||||
nullptr, /* FreeContextBuffer */
|
||||
nullptr, /* QuerySecurityPackageInfo */
|
||||
nullptr, /* Reserved3 */
|
||||
nullptr, /* Reserved4 */
|
||||
nullptr, /* ExportSecurityContext */
|
||||
nullptr, /* ImportSecurityContext */
|
||||
nullptr, /* AddCredentials */
|
||||
nullptr, /* Reserved8 */
|
||||
nullptr, /* QuerySecurityContextToken */
|
||||
schannel_EncryptMessage, /* EncryptMessage */
|
||||
schannel_DecryptMessage, /* DecryptMessage */
|
||||
nullptr, /* SetContextAttributes */
|
||||
nullptr, /* SetCredentialsAttributes */
|
||||
};
|
||||
|
||||
const SecPkgInfoA SCHANNEL_SecPkgInfoA = {
|
||||
0x000107B3, /* fCapabilities */
|
||||
1, /* wVersion */
|
||||
0x000E, /* wRPCID */
|
||||
SCHANNEL_CB_MAX_TOKEN, /* cbMaxToken */
|
||||
"Schannel", /* Name */
|
||||
"Schannel Security Package" /* Comment */
|
||||
};
|
||||
|
||||
static WCHAR SCHANNEL_SecPkgInfoW_NameBuffer[32] = WINPR_C_ARRAY_INIT;
|
||||
static WCHAR SCHANNEL_SecPkgInfoW_CommentBuffer[32] = WINPR_C_ARRAY_INIT;
|
||||
|
||||
const SecPkgInfoW SCHANNEL_SecPkgInfoW = {
|
||||
0x000107B3, /* fCapabilities */
|
||||
1, /* wVersion */
|
||||
0x000E, /* wRPCID */
|
||||
SCHANNEL_CB_MAX_TOKEN, /* cbMaxToken */
|
||||
SCHANNEL_SecPkgInfoW_NameBuffer, /* Name */
|
||||
SCHANNEL_SecPkgInfoW_CommentBuffer /* Comment */
|
||||
};
|
||||
|
||||
BOOL SCHANNEL_init(void)
|
||||
{
|
||||
InitializeConstWCharFromUtf8(SCHANNEL_SecPkgInfoA.Name, SCHANNEL_SecPkgInfoW_NameBuffer,
|
||||
ARRAYSIZE(SCHANNEL_SecPkgInfoW_NameBuffer));
|
||||
InitializeConstWCharFromUtf8(SCHANNEL_SecPkgInfoA.Comment, SCHANNEL_SecPkgInfoW_CommentBuffer,
|
||||
ARRAYSIZE(SCHANNEL_SecPkgInfoW_CommentBuffer));
|
||||
return TRUE;
|
||||
}
|
||||
Reference in New Issue
Block a user