801 lines
24 KiB
C
801 lines
24 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* Kerberos Auth Protocol
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*
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* Copyright 2015 ANSSI, Author Thomas Calderon
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* Copyright 2017 Dorian Ducournau <dorian.ducournau@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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <winpr/crt.h>
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#include <winpr/sspi.h>
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#include <winpr/print.h>
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#include <winpr/sysinfo.h>
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#include <winpr/registry.h>
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#include "kerberos.h"
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#ifdef WITH_GSSAPI_HEIMDAL
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#include <krb5-protos.h>
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#endif
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#include "../sspi.h"
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#include "../../log.h"
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#define TAG WINPR_TAG("sspi.Kerberos")
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struct _KRB_CONTEXT
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{
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CtxtHandle context;
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SSPI_CREDENTIALS* credentials;
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SEC_WINNT_AUTH_IDENTITY identity;
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/* GSSAPI */
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UINT32 major_status;
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UINT32 minor_status;
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UINT32 actual_time;
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sspi_gss_cred_id_t cred;
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sspi_gss_ctx_id_t gss_ctx;
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sspi_gss_name_t target_name;
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};
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static const char* KRB_PACKAGE_NAME = "Kerberos";
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const SecPkgInfoA KERBEROS_SecPkgInfoA = {
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0x000F3BBF, /* fCapabilities */
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1, /* wVersion */
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0x0010, /* wRPCID */
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0x0000BB80, /* cbMaxToken : 48k bytes maximum for Windows Server 2012 */
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"Kerberos", /* Name */
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"Kerberos Security Package" /* Comment */
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};
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static WCHAR KERBEROS_SecPkgInfoW_Name[] = { 'K', 'e', 'r', 'b', 'e', 'r', 'o', 's', '\0' };
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static WCHAR KERBEROS_SecPkgInfoW_Comment[] = { 'K', 'e', 'r', 'b', 'e', 'r', 'o', 's', ' ',
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'S', 'e', 'c', 'u', 'r', 'i', 't', 'y', ' ',
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'P', 'a', 'c', 'k', 'a', 'g', 'e', '\0' };
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const SecPkgInfoW KERBEROS_SecPkgInfoW = {
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0x000F3BBF, /* fCapabilities */
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1, /* wVersion */
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0x0010, /* wRPCID */
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0x0000BB80, /* cbMaxToken : 48k bytes maximum for Windows Server 2012 */
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KERBEROS_SecPkgInfoW_Name, /* Name */
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KERBEROS_SecPkgInfoW_Comment /* Comment */
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};
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static sspi_gss_OID_desc g_SSPI_GSS_C_SPNEGO_KRB5 = {
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9, (void*)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"
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};
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static sspi_gss_OID SSPI_GSS_C_SPNEGO_KRB5 = &g_SSPI_GSS_C_SPNEGO_KRB5;
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static KRB_CONTEXT* kerberos_ContextNew(void)
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{
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KRB_CONTEXT* context;
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context = (KRB_CONTEXT*)calloc(1, sizeof(KRB_CONTEXT));
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if (!context)
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return NULL;
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context->minor_status = 0;
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context->major_status = 0;
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context->gss_ctx = SSPI_GSS_C_NO_CONTEXT;
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context->cred = SSPI_GSS_C_NO_CREDENTIAL;
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return context;
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}
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static void kerberos_ContextFree(KRB_CONTEXT* context)
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{
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UINT32 minor_status;
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if (!context)
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return;
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if (context->target_name)
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{
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sspi_gss_release_name(&minor_status, &context->target_name);
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context->target_name = NULL;
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}
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if (context->gss_ctx)
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{
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sspi_gss_delete_sec_context(&minor_status, &context->gss_ctx, SSPI_GSS_C_NO_BUFFER);
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context->gss_ctx = SSPI_GSS_C_NO_CONTEXT;
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}
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free(context);
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}
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static SECURITY_STATUS SEC_ENTRY kerberos_AcquireCredentialsHandleW(
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SEC_WCHAR* pszPrincipal, SEC_WCHAR* 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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return SEC_E_OK;
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}
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static SECURITY_STATUS SEC_ENTRY kerberos_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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return SEC_E_OK;
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}
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static SECURITY_STATUS SEC_ENTRY kerberos_FreeCredentialsHandle(PCredHandle phCredential)
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{
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SSPI_CREDENTIALS* credentials;
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if (!phCredential)
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return SEC_E_INVALID_HANDLE;
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credentials = (SSPI_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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static SECURITY_STATUS SEC_ENTRY kerberos_QueryCredentialsAttributesW(PCredHandle phCredential,
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ULONG ulAttribute,
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void* pBuffer)
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{
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if (ulAttribute == SECPKG_CRED_ATTR_NAMES)
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{
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return SEC_E_OK;
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}
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WLog_ERR(TAG, "[%s]: TODO: Implement ulAttribute=%08" PRIx32, __FUNCTION__, ulAttribute);
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return SEC_E_UNSUPPORTED_FUNCTION;
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}
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static SECURITY_STATUS SEC_ENTRY kerberos_QueryCredentialsAttributesA(PCredHandle phCredential,
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ULONG ulAttribute,
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void* pBuffer)
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{
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return kerberos_QueryCredentialsAttributesW(phCredential, ulAttribute, pBuffer);
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}
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static SECURITY_STATUS SEC_ENTRY kerberos_InitializeSecurityContextW(
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PCredHandle phCredential, PCtxtHandle phContext, SEC_WCHAR* pszTargetName, ULONG fContextReq,
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ULONG Reserved1, ULONG TargetDataRep, PSecBufferDesc pInput, ULONG Reserved2,
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PCtxtHandle phNewContext, PSecBufferDesc pOutput, ULONG* pfContextAttr, PTimeStamp ptsExpiry)
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{
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WLog_ERR(TAG, "[%s]: TODO: Implement", __FUNCTION__);
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return SEC_E_UNSUPPORTED_FUNCTION;
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}
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static int kerberos_SetContextServicePrincipalNameA(KRB_CONTEXT* context,
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SEC_CHAR* ServicePrincipalName)
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{
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char* p;
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UINT32 major_status;
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UINT32 minor_status;
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char* gss_name = NULL;
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sspi_gss_buffer_desc name_buffer;
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if (!ServicePrincipalName)
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{
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context->target_name = NULL;
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return 1;
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}
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/* GSSAPI expects a SPN of type <service>@FQDN, let's construct it */
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gss_name = _strdup(ServicePrincipalName);
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if (!gss_name)
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return -1;
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p = strchr(gss_name, '/');
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if (p)
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*p = '@';
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name_buffer.value = gss_name;
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name_buffer.length = strlen(gss_name) + 1;
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major_status = sspi_gss_import_name(&minor_status, &name_buffer,
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SSPI_GSS_C_NT_HOSTBASED_SERVICE, &(context->target_name));
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free(gss_name);
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if (SSPI_GSS_ERROR(major_status))
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{
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WLog_ERR(TAG, "error: gss_import_name failed");
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return -1;
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}
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return 1;
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}
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#ifdef WITH_GSSAPI
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static krb5_error_code KRB5_CALLCONV acquire_cred(krb5_context ctx, krb5_principal client,
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const char* password)
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{
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krb5_error_code ret;
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krb5_creds creds;
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krb5_deltat starttime = 0;
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krb5_get_init_creds_opt* options = NULL;
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krb5_ccache ccache;
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krb5_init_creds_context init_ctx = NULL;
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/* Get default ccache */
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if ((ret = krb5_cc_default(ctx, &ccache)))
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{
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WLog_ERR(TAG, "error while getting default ccache");
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goto cleanup;
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}
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if ((ret = krb5_cc_initialize(ctx, ccache, client)))
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{
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WLog_ERR(TAG, "error: could not initialize ccache");
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goto cleanup;
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}
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memset(&creds, 0, sizeof(creds));
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if ((ret = krb5_get_init_creds_opt_alloc(ctx, &options)))
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{
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WLog_ERR(TAG, "error while allocating options");
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goto cleanup;
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}
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/* Set default options */
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krb5_get_init_creds_opt_set_forwardable(options, 0);
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krb5_get_init_creds_opt_set_proxiable(options, 0);
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#ifdef WITH_GSSAPI_MIT
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/* for MIT we specify ccache output using an option */
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if ((ret = krb5_get_init_creds_opt_set_out_ccache(ctx, options, ccache)))
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{
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WLog_ERR(TAG, "error while setting ccache output");
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goto cleanup;
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}
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#endif
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if ((ret = krb5_init_creds_init(ctx, client, NULL, NULL, starttime, options, &init_ctx)))
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{
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WLog_ERR(TAG, "error krb5_init_creds_init failed");
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goto cleanup;
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}
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if ((ret = krb5_init_creds_set_password(ctx, init_ctx, password)))
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{
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WLog_ERR(TAG, "error krb5_init_creds_set_password failed");
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goto cleanup;
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}
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/* Get credentials */
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if ((ret = krb5_init_creds_get(ctx, init_ctx)))
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{
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WLog_ERR(TAG, "error while getting credentials");
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goto cleanup;
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}
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/* Retrieve credentials */
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if ((ret = krb5_init_creds_get_creds(ctx, init_ctx, &creds)))
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{
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WLog_ERR(TAG, "error while retrieving credentials");
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goto cleanup;
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}
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#ifdef WITH_GSSAPI_HEIMDAL
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/* For Heimdal, we use this function to store credentials */
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if ((ret = krb5_init_creds_store(ctx, init_ctx, ccache)))
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{
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WLog_ERR(TAG, "error while storing credentials");
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goto cleanup;
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}
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#endif
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cleanup:
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krb5_free_cred_contents(ctx, &creds);
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#ifdef HAVE_AT_LEAST_KRB_V1_13
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/* MIT Kerberos version 1.13 at minimum.
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* For releases 1.12 and previous, krb5_get_init_creds_opt structure
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* is freed in krb5_init_creds_free() */
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if (options)
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krb5_get_init_creds_opt_free(ctx, options);
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#endif
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if (init_ctx)
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krb5_init_creds_free(ctx, init_ctx);
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if (ccache)
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krb5_cc_close(ctx, ccache);
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return ret;
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}
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static int init_creds(LPCWSTR username, size_t username_len, LPCWSTR password, size_t password_len)
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{
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krb5_error_code ret = 0;
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krb5_context ctx = NULL;
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krb5_principal principal = NULL;
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char* krb_name = NULL;
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char* lusername = NULL;
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char* lrealm = NULL;
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char* lpassword = NULL;
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int flags = 0;
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char* pstr = NULL;
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size_t krb_name_len = 0;
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size_t lrealm_len = 0;
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size_t lusername_len = 0;
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int status = 0;
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status = ConvertFromUnicode(CP_UTF8, 0, username, username_len, &lusername, 0, NULL, NULL);
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if (status <= 0)
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{
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WLog_ERR(TAG, "Failed to convert username");
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goto cleanup;
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}
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status = ConvertFromUnicode(CP_UTF8, 0, password, password_len, &lpassword, 0, NULL, NULL);
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if (status <= 0)
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{
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WLog_ERR(TAG, "Failed to convert password");
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goto cleanup;
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}
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/* Could call krb5_init_secure_context, but it disallows user overrides */
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ret = krb5_init_context(&ctx);
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if (ret)
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{
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WLog_ERR(TAG, "error: while initializing Kerberos 5 library");
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goto cleanup;
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}
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ret = krb5_get_default_realm(ctx, &lrealm);
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if (ret)
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{
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WLog_WARN(TAG, "could not get Kerberos default realm");
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goto cleanup;
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}
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lrealm_len = strlen(lrealm);
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lusername_len = strlen(lusername);
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krb_name_len = lusername_len + lrealm_len + 1; // +1 for '@'
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krb_name = calloc(krb_name_len + 1, sizeof(char));
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if (!krb_name)
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{
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WLog_ERR(TAG, "could not allocate memory for string rep of principal\n");
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ret = -1;
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goto cleanup;
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}
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/* Set buffer */
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_snprintf(krb_name, krb_name_len + 1, "%s@%s", lusername, lrealm);
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#ifdef WITH_DEBUG_NLA
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WLog_DBG(TAG, "copied string is %s\n", krb_name);
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#endif
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pstr = strchr(lusername, '@');
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if (pstr != NULL)
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flags = KRB5_PRINCIPAL_PARSE_ENTERPRISE;
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/* Use the specified principal name. */
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ret = krb5_parse_name_flags(ctx, krb_name, flags, &principal);
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if (ret)
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{
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WLog_ERR(TAG, "could not convert %s to principal", krb_name);
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goto cleanup;
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}
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ret = acquire_cred(ctx, principal, lpassword);
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if (ret)
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{
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WLog_ERR(TAG, "Kerberos credentials not found and could not be acquired");
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goto cleanup;
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}
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cleanup:
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free(lusername);
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free(lpassword);
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if (krb_name)
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free(krb_name);
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if (lrealm)
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krb5_free_default_realm(ctx, lrealm);
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if (principal)
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krb5_free_principal(ctx, principal);
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if (ctx)
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krb5_free_context(ctx);
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return ret;
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}
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#endif
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static SECURITY_STATUS SEC_ENTRY kerberos_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, ULONG* pfContextAttr, PTimeStamp ptsExpiry)
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{
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KRB_CONTEXT* context;
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SSPI_CREDENTIALS* credentials;
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PSecBuffer input_buffer = NULL;
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PSecBuffer output_buffer = NULL;
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sspi_gss_buffer_desc input_tok = { 0 };
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sspi_gss_buffer_desc output_tok = { 0 };
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sspi_gss_OID actual_mech;
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sspi_gss_OID desired_mech;
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UINT32 actual_services;
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input_tok.length = 0;
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output_tok.length = 0;
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desired_mech = SSPI_GSS_C_SPNEGO_KRB5;
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context = (KRB_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
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if (!context)
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{
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context = kerberos_ContextNew();
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if (!context)
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return SEC_E_INSUFFICIENT_MEMORY;
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credentials = (SSPI_CREDENTIALS*)sspi_SecureHandleGetLowerPointer(phCredential);
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context->credentials = credentials;
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if (kerberos_SetContextServicePrincipalNameA(context, pszTargetName) < 0)
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{
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kerberos_ContextFree(context);
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return SEC_E_INTERNAL_ERROR;
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}
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sspi_SecureHandleSetLowerPointer(phNewContext, context);
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sspi_SecureHandleSetUpperPointer(phNewContext, (void*)KRB_PACKAGE_NAME);
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}
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if (!pInput)
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{
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#if defined(WITH_GSSAPI)
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context->major_status = sspi_gss_init_sec_context(
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&(context->minor_status), context->cred, &(context->gss_ctx), context->target_name,
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desired_mech, SSPI_GSS_C_MUTUAL_FLAG | SSPI_GSS_C_DELEG_FLAG, SSPI_GSS_C_INDEFINITE,
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SSPI_GSS_C_NO_CHANNEL_BINDINGS, &input_tok, &actual_mech, &output_tok, &actual_services,
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&(context->actual_time));
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if (SSPI_GSS_ERROR(context->major_status))
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{
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/* GSSAPI failed because we do not have credentials */
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if (context->major_status & SSPI_GSS_S_NO_CRED)
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{
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/* Then let's try to acquire credentials using login and password,
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* and only those two, means not with a smartcard.
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* If we use smartcard-logon, the credentials have already
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* been acquired by pkinit process. If not, returned error previously.
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*/
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if (init_creds(context->credentials->identity.User,
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context->credentials->identity.UserLength,
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context->credentials->identity.Password,
|
|
context->credentials->identity.PasswordLength))
|
|
return SEC_E_NO_CREDENTIALS;
|
|
|
|
WLog_INFO(TAG, "Authenticated to Kerberos v5 via login/password");
|
|
/* retry GSSAPI call */
|
|
context->major_status = sspi_gss_init_sec_context(
|
|
&(context->minor_status), context->cred, &(context->gss_ctx),
|
|
context->target_name, desired_mech,
|
|
SSPI_GSS_C_MUTUAL_FLAG | SSPI_GSS_C_DELEG_FLAG, SSPI_GSS_C_INDEFINITE,
|
|
SSPI_GSS_C_NO_CHANNEL_BINDINGS, &input_tok, &actual_mech, &output_tok,
|
|
&actual_services, &(context->actual_time));
|
|
|
|
if (SSPI_GSS_ERROR(context->major_status))
|
|
{
|
|
/* We can't use Kerberos */
|
|
WLog_ERR(TAG, "Init GSS security context failed : can't use Kerberos");
|
|
return SEC_E_INTERNAL_ERROR;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
if (context->major_status & SSPI_GSS_S_CONTINUE_NEEDED)
|
|
{
|
|
if (output_tok.length != 0)
|
|
{
|
|
if (!pOutput)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
if (pOutput->cBuffers < 1)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
output_buffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
|
|
|
|
if (!output_buffer)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
if (output_buffer->cbBuffer < 1)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
CopyMemory(output_buffer->pvBuffer, output_tok.value, output_tok.length);
|
|
output_buffer->cbBuffer = output_tok.length;
|
|
sspi_gss_release_buffer(&(context->minor_status), &output_tok);
|
|
return SEC_I_CONTINUE_NEEDED;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
input_buffer = sspi_FindSecBuffer(pInput, SECBUFFER_TOKEN);
|
|
|
|
if (!input_buffer)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
if (input_buffer->cbBuffer < 1)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
input_tok.value = input_buffer->pvBuffer;
|
|
input_tok.length = input_buffer->cbBuffer;
|
|
context->major_status = sspi_gss_init_sec_context(
|
|
&(context->minor_status), context->cred, &(context->gss_ctx), context->target_name,
|
|
desired_mech, SSPI_GSS_C_MUTUAL_FLAG | SSPI_GSS_C_DELEG_FLAG, SSPI_GSS_C_INDEFINITE,
|
|
SSPI_GSS_C_NO_CHANNEL_BINDINGS, &input_tok, &actual_mech, &output_tok, &actual_services,
|
|
&(context->actual_time));
|
|
|
|
if (SSPI_GSS_ERROR(context->major_status))
|
|
return SEC_E_INTERNAL_ERROR;
|
|
|
|
if (output_tok.length == 0)
|
|
{
|
|
/* Free output_buffer to detect second call in NLA */
|
|
output_buffer = sspi_FindSecBuffer(pOutput, SECBUFFER_TOKEN);
|
|
sspi_SecBufferFree(output_buffer);
|
|
return SEC_E_OK;
|
|
}
|
|
else
|
|
{
|
|
return SEC_E_INTERNAL_ERROR;
|
|
}
|
|
}
|
|
|
|
return SEC_E_INTERNAL_ERROR;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_DeleteSecurityContext(PCtxtHandle phContext)
|
|
{
|
|
KRB_CONTEXT* context;
|
|
context = (KRB_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
|
|
|
|
if (!context)
|
|
return SEC_E_INVALID_HANDLE;
|
|
|
|
kerberos_ContextFree(context);
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_QueryContextAttributesW(PCtxtHandle phContext,
|
|
ULONG ulAttribute, void* pBuffer)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_QueryContextAttributesA(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;
|
|
/* The MaxTokenSize by default is 12,000 bytes. This has been the default value
|
|
* since Windows 2000 SP2 and still remains in Windows 7 and Windows 2008 R2.
|
|
* For Windows Server 2012, the default value of the MaxTokenSize registry
|
|
* entry is 48,000 bytes.*/
|
|
ContextSizes->cbMaxToken = KERBEROS_SecPkgInfoA.cbMaxToken;
|
|
ContextSizes->cbMaxSignature = 0; /* means verify not supported */
|
|
ContextSizes->cbBlockSize = 0; /* padding not used */
|
|
ContextSizes->cbSecurityTrailer =
|
|
60; /* gss_wrap adds additional 60 bytes for encrypt message */
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
WLog_ERR(TAG, "[%s]: TODO: Implement ulAttribute=%08" PRIx32, __FUNCTION__, ulAttribute);
|
|
return SEC_E_UNSUPPORTED_FUNCTION;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_EncryptMessage(PCtxtHandle phContext, ULONG fQOP,
|
|
PSecBufferDesc pMessage,
|
|
ULONG MessageSeqNo)
|
|
{
|
|
int index;
|
|
int conf_state;
|
|
UINT32 major_status;
|
|
UINT32 minor_status;
|
|
KRB_CONTEXT* context;
|
|
sspi_gss_buffer_desc input;
|
|
sspi_gss_buffer_desc output;
|
|
PSecBuffer data_buffer = NULL;
|
|
context = (KRB_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
|
|
|
|
if (!context)
|
|
return SEC_E_INVALID_HANDLE;
|
|
|
|
for (index = 0; index < (int)pMessage->cBuffers; index++)
|
|
{
|
|
if (pMessage->pBuffers[index].BufferType == SECBUFFER_DATA)
|
|
data_buffer = &pMessage->pBuffers[index];
|
|
}
|
|
|
|
if (!data_buffer)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
input.value = data_buffer->pvBuffer;
|
|
input.length = data_buffer->cbBuffer;
|
|
major_status = sspi_gss_wrap(&minor_status, context->gss_ctx, TRUE, SSPI_GSS_C_QOP_DEFAULT,
|
|
&input, &conf_state, &output);
|
|
|
|
if (SSPI_GSS_ERROR(major_status))
|
|
return SEC_E_INTERNAL_ERROR;
|
|
|
|
if (conf_state == 0)
|
|
{
|
|
WLog_ERR(TAG, "error: gss_wrap confidentiality was not applied");
|
|
sspi_gss_release_buffer(&minor_status, &output);
|
|
return SEC_E_INTERNAL_ERROR;
|
|
}
|
|
|
|
CopyMemory(data_buffer->pvBuffer, output.value, output.length);
|
|
sspi_gss_release_buffer(&minor_status, &output);
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_DecryptMessage(PCtxtHandle phContext,
|
|
PSecBufferDesc pMessage,
|
|
ULONG MessageSeqNo, ULONG* pfQOP)
|
|
{
|
|
int index;
|
|
int conf_state;
|
|
UINT32 major_status;
|
|
UINT32 minor_status;
|
|
KRB_CONTEXT* context;
|
|
sspi_gss_buffer_desc input_data;
|
|
sspi_gss_buffer_desc output;
|
|
PSecBuffer data_buffer_to_unwrap = NULL;
|
|
context = (KRB_CONTEXT*)sspi_SecureHandleGetLowerPointer(phContext);
|
|
|
|
if (!context)
|
|
return SEC_E_INVALID_HANDLE;
|
|
|
|
for (index = 0; index < (int)pMessage->cBuffers; index++)
|
|
{
|
|
if (pMessage->pBuffers[index].BufferType == SECBUFFER_DATA)
|
|
data_buffer_to_unwrap = &pMessage->pBuffers[index];
|
|
}
|
|
|
|
if (!data_buffer_to_unwrap)
|
|
return SEC_E_INVALID_TOKEN;
|
|
|
|
/* unwrap encrypted TLS key AND its signature */
|
|
input_data.value = data_buffer_to_unwrap->pvBuffer;
|
|
input_data.length = data_buffer_to_unwrap->cbBuffer;
|
|
major_status =
|
|
sspi_gss_unwrap(&minor_status, context->gss_ctx, &input_data, &output, &conf_state, NULL);
|
|
|
|
if (SSPI_GSS_ERROR(major_status))
|
|
return SEC_E_INTERNAL_ERROR;
|
|
|
|
if (conf_state == 0)
|
|
{
|
|
WLog_ERR(TAG, "error: gss_unwrap confidentiality was not applied");
|
|
sspi_gss_release_buffer(&minor_status, &output);
|
|
return SEC_E_INTERNAL_ERROR;
|
|
}
|
|
|
|
CopyMemory(data_buffer_to_unwrap->pvBuffer, output.value, output.length);
|
|
sspi_gss_release_buffer(&minor_status, &output);
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_MakeSignature(PCtxtHandle phContext, ULONG fQOP,
|
|
PSecBufferDesc pMessage, ULONG MessageSeqNo)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
static SECURITY_STATUS SEC_ENTRY kerberos_VerifySignature(PCtxtHandle phContext,
|
|
PSecBufferDesc pMessage,
|
|
ULONG MessageSeqNo, ULONG* pfQOP)
|
|
{
|
|
return SEC_E_OK;
|
|
}
|
|
|
|
const SecurityFunctionTableA KERBEROS_SecurityFunctionTableA = {
|
|
1, /* dwVersion */
|
|
NULL, /* EnumerateSecurityPackages */
|
|
kerberos_QueryCredentialsAttributesA, /* QueryCredentialsAttributes */
|
|
kerberos_AcquireCredentialsHandleA, /* AcquireCredentialsHandle */
|
|
kerberos_FreeCredentialsHandle, /* FreeCredentialsHandle */
|
|
NULL, /* Reserved2 */
|
|
kerberos_InitializeSecurityContextA, /* InitializeSecurityContext */
|
|
NULL, /* AcceptSecurityContext */
|
|
NULL, /* CompleteAuthToken */
|
|
kerberos_DeleteSecurityContext, /* DeleteSecurityContext */
|
|
NULL, /* ApplyControlToken */
|
|
kerberos_QueryContextAttributesA, /* QueryContextAttributes */
|
|
NULL, /* ImpersonateSecurityContext */
|
|
NULL, /* RevertSecurityContext */
|
|
kerberos_MakeSignature, /* MakeSignature */
|
|
kerberos_VerifySignature, /* VerifySignature */
|
|
NULL, /* FreeContextBuffer */
|
|
NULL, /* QuerySecurityPackageInfo */
|
|
NULL, /* Reserved3 */
|
|
NULL, /* Reserved4 */
|
|
NULL, /* ExportSecurityContext */
|
|
NULL, /* ImportSecurityContext */
|
|
NULL, /* AddCredentials */
|
|
NULL, /* Reserved8 */
|
|
NULL, /* QuerySecurityContextToken */
|
|
kerberos_EncryptMessage, /* EncryptMessage */
|
|
kerberos_DecryptMessage, /* DecryptMessage */
|
|
NULL, /* SetContextAttributes */
|
|
};
|
|
|
|
const SecurityFunctionTableW KERBEROS_SecurityFunctionTableW = {
|
|
1, /* dwVersion */
|
|
NULL, /* EnumerateSecurityPackages */
|
|
kerberos_QueryCredentialsAttributesW, /* QueryCredentialsAttributes */
|
|
kerberos_AcquireCredentialsHandleW, /* AcquireCredentialsHandle */
|
|
kerberos_FreeCredentialsHandle, /* FreeCredentialsHandle */
|
|
NULL, /* Reserved2 */
|
|
kerberos_InitializeSecurityContextW, /* InitializeSecurityContext */
|
|
NULL, /* AcceptSecurityContext */
|
|
NULL, /* CompleteAuthToken */
|
|
kerberos_DeleteSecurityContext, /* DeleteSecurityContext */
|
|
NULL, /* ApplyControlToken */
|
|
kerberos_QueryContextAttributesW, /* QueryContextAttributes */
|
|
NULL, /* ImpersonateSecurityContext */
|
|
NULL, /* RevertSecurityContext */
|
|
kerberos_MakeSignature, /* MakeSignature */
|
|
kerberos_VerifySignature, /* VerifySignature */
|
|
NULL, /* FreeContextBuffer */
|
|
NULL, /* QuerySecurityPackageInfo */
|
|
NULL, /* Reserved3 */
|
|
NULL, /* Reserved4 */
|
|
NULL, /* ExportSecurityContext */
|
|
NULL, /* ImportSecurityContext */
|
|
NULL, /* AddCredentials */
|
|
NULL, /* Reserved8 */
|
|
NULL, /* QuerySecurityContextToken */
|
|
kerberos_EncryptMessage, /* EncryptMessage */
|
|
kerberos_DecryptMessage, /* DecryptMessage */
|
|
NULL, /* SetContextAttributes */
|
|
};
|