FreeRDP/libfreerdp/core/nla.c
2015-07-01 16:05:11 +02:00

1614 lines
40 KiB
C

/**
* WinPR: Windows Portable Runtime
* Network Level Authentication (NLA)
*
* Copyright 2010-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2015 Thincast Technologies GmbH
* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#ifndef _WIN32
#include <unistd.h>
#endif
#include <freerdp/log.h>
#include <freerdp/crypto/tls.h>
#include <winpr/crt.h>
#include <winpr/sspi.h>
#include <winpr/print.h>
#include <winpr/tchar.h>
#include <winpr/dsparse.h>
#include <winpr/library.h>
#include <winpr/registry.h>
#include "nla.h"
#define TAG FREERDP_TAG("core.nla")
#define SERVER_KEY "Software\\"FREERDP_VENDOR_STRING"\\" \
FREERDP_PRODUCT_STRING"\\Server"
/**
* TSRequest ::= SEQUENCE {
* version [0] INTEGER,
* negoTokens [1] NegoData OPTIONAL,
* authInfo [2] OCTET STRING OPTIONAL,
* pubKeyAuth [3] OCTET STRING OPTIONAL
* }
*
* NegoData ::= SEQUENCE OF NegoDataItem
*
* NegoDataItem ::= SEQUENCE {
* negoToken [0] OCTET STRING
* }
*
* TSCredentials ::= SEQUENCE {
* credType [0] INTEGER,
* credentials [1] OCTET STRING
* }
*
* TSPasswordCreds ::= SEQUENCE {
* domainName [0] OCTET STRING,
* userName [1] OCTET STRING,
* password [2] OCTET STRING
* }
*
* TSSmartCardCreds ::= SEQUENCE {
* pin [0] OCTET STRING,
* cspData [1] TSCspDataDetail,
* userHint [2] OCTET STRING OPTIONAL,
* domainHint [3] OCTET STRING OPTIONAL
* }
*
* TSCspDataDetail ::= SEQUENCE {
* keySpec [0] INTEGER,
* cardName [1] OCTET STRING OPTIONAL,
* readerName [2] OCTET STRING OPTIONAL,
* containerName [3] OCTET STRING OPTIONAL,
* cspName [4] OCTET STRING OPTIONAL
* }
*
*/
#define NLA_PKG_NAME NEGOSSP_NAME
#define TERMSRV_SPN_PREFIX "TERMSRV/"
static BOOL nla_send(rdpNla* nla);
static int nla_recv(rdpNla* nla);
static void nla_buffer_print(rdpNla* nla);
static void nla_buffer_free(rdpNla* nla);
static SECURITY_STATUS nla_encrypt_public_key_echo(rdpNla* nla);
static SECURITY_STATUS nla_decrypt_public_key_echo(rdpNla* nla);
static SECURITY_STATUS nla_encrypt_ts_credentials(rdpNla* nla);
static SECURITY_STATUS nla_decrypt_ts_credentials(rdpNla* nla);
static BOOL nla_read_ts_password_creds(rdpNla* nla, wStream* s);
static void nla_identity_free(SEC_WINNT_AUTH_IDENTITY* identity);
#define ber_sizeof_sequence_octet_string(length) ber_sizeof_contextual_tag(ber_sizeof_octet_string(length)) + ber_sizeof_octet_string(length)
#define ber_write_sequence_octet_string(stream, context, value, length) ber_write_contextual_tag(stream, context, ber_sizeof_octet_string(length), TRUE) + ber_write_octet_string(stream, value, length)
void nla_identity_free(SEC_WINNT_AUTH_IDENTITY* identity)
{
if (identity)
{
if (identity->User)
{
memset(identity->User, 0, identity->UserLength*2);
free(identity->User);
}
if (identity->Password)
{
memset(identity->Password, 0, identity->PasswordLength*2);
free(identity->Password);
}
if (identity->Domain)
{
memset(identity->Domain, 0, identity->DomainLength*2);
free(identity->Domain);
}
}
free(identity);
}
/**
* Initialize NTLMSSP authentication module (client).
* @param credssp
*/
int nla_client_init(rdpNla* nla)
{
char* spn;
int length;
rdpTls* tls = NULL;
BOOL PromptPassword = FALSE;
freerdp* instance = nla->instance;
rdpSettings* settings = nla->settings;
nla->state = NLA_STATE_INITIAL;
if (settings->RestrictedAdminModeRequired)
settings->DisableCredentialsDelegation = TRUE;
if ((!settings->Password) || (!settings->Username)
|| (!strlen(settings->Password)) || (!strlen(settings->Username)))
{
PromptPassword = TRUE;
}
#ifndef _WIN32
if (PromptPassword)
{
if (settings->RestrictedAdminModeRequired)
{
if ((settings->PasswordHash) && (strlen(settings->PasswordHash) > 0))
PromptPassword = FALSE;
}
}
#endif
if (PromptPassword)
{
if (instance->Authenticate)
{
BOOL proceed = instance->Authenticate(instance,
&settings->Username, &settings->Password, &settings->Domain);
if (!proceed)
{
freerdp_set_last_error(instance->context, FREERDP_ERROR_CONNECT_CANCELLED);
return 0;
}
}
}
if (!settings->Username)
{
nla_identity_free(nla->identity);
nla->identity = NULL;
}
else
sspi_SetAuthIdentity(nla->identity, settings->Username, settings->Domain,
settings->Password);
#ifndef _WIN32
{
SEC_WINNT_AUTH_IDENTITY* identity = nla->identity;
if (!identity)
{
WLog_ERR(TAG, "NLA identity=%p", identity);
return -1;
}
if (settings->RestrictedAdminModeRequired)
{
if (settings->PasswordHash)
{
if (strlen(settings->PasswordHash) == 32)
{
free(identity->Password);
identity->PasswordLength = ConvertToUnicode(CP_UTF8, 0,
settings->PasswordHash, -1, &identity->Password, 0) - 1;
/**
* Multiply password hash length by 64 to obtain a length exceeding
* the maximum (256) and use it this for hash identification in WinPR.
*/
identity->PasswordLength = 32 * 64; /* 2048 */
}
}
}
}
#endif
tls = nla->transport->tls;
if (!tls)
{
WLog_ERR(TAG, "Unknown NLA transport layer");
return -1;
}
if (!sspi_SecBufferAlloc(&nla->PublicKey, tls->PublicKeyLength))
{
WLog_ERR(TAG, "Failed to allocate sspic secBuffer");
return -1;
}
CopyMemory(nla->PublicKey.pvBuffer, tls->PublicKey, tls->PublicKeyLength);
length = sizeof(TERMSRV_SPN_PREFIX) + strlen(settings->ServerHostname);
spn = (SEC_CHAR*) malloc(length + 1);
if (!spn)
return -1;
sprintf(spn, "%s%s", TERMSRV_SPN_PREFIX, settings->ServerHostname);
#ifdef UNICODE
nla->ServicePrincipalName = NULL;
ConvertToUnicode(CP_UTF8, 0, spn, -1, &nla->ServicePrincipalName, 0);
free(spn);
#else
nla->ServicePrincipalName = spn;
#endif
nla->table = InitSecurityInterfaceEx(0);
nla->status = nla->table->QuerySecurityPackageInfo(NLA_PKG_NAME, &nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status: 0x%08X", nla->status);
return -1;
}
nla->cbMaxToken = nla->pPackageInfo->cbMaxToken;
nla->status = nla->table->AcquireCredentialsHandle(NULL, NLA_PKG_NAME,
SECPKG_CRED_OUTBOUND, NULL, nla->identity, NULL, NULL, &nla->credentials,
&nla->expiration);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "AcquireCredentialsHandle status: 0x%08X", nla->status);
return -1;
}
nla->haveContext = FALSE;
nla->haveInputBuffer = FALSE;
nla->havePubKeyAuth = FALSE;
ZeroMemory(&nla->inputBuffer, sizeof(SecBuffer));
ZeroMemory(&nla->outputBuffer, sizeof(SecBuffer));
ZeroMemory(&nla->ContextSizes, sizeof(SecPkgContext_Sizes));
/*
* from tspkg.dll: 0x00000132
* ISC_REQ_MUTUAL_AUTH
* ISC_REQ_CONFIDENTIALITY
* ISC_REQ_USE_SESSION_KEY
* ISC_REQ_ALLOCATE_MEMORY
*/
nla->fContextReq = ISC_REQ_MUTUAL_AUTH | ISC_REQ_CONFIDENTIALITY | ISC_REQ_USE_SESSION_KEY;
return 1;
}
int nla_client_begin(rdpNla* nla)
{
if (nla_client_init(nla) < 1)
return -1;
if (nla->state != NLA_STATE_INITIAL)
return -1;
nla->outputBufferDesc.ulVersion = SECBUFFER_VERSION;
nla->outputBufferDesc.cBuffers = 1;
nla->outputBufferDesc.pBuffers = &nla->outputBuffer;
nla->outputBuffer.BufferType = SECBUFFER_TOKEN;
nla->outputBuffer.cbBuffer = nla->cbMaxToken;
nla->outputBuffer.pvBuffer = malloc(nla->outputBuffer.cbBuffer);
if (!nla->outputBuffer.pvBuffer)
return -1;
nla->status = nla->table->InitializeSecurityContext(&nla->credentials,
NULL, nla->ServicePrincipalName, nla->fContextReq, 0,
SECURITY_NATIVE_DREP, NULL, 0, &nla->context,
&nla->outputBufferDesc, &nla->pfContextAttr, &nla->expiration);
if ((nla->status == SEC_I_COMPLETE_AND_CONTINUE) || (nla->status == SEC_I_COMPLETE_NEEDED))
{
if (nla->table->CompleteAuthToken)
nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (nla->status == SEC_I_COMPLETE_NEEDED)
nla->status = SEC_E_OK;
else if (nla->status == SEC_I_COMPLETE_AND_CONTINUE)
nla->status = SEC_I_CONTINUE_NEEDED;
}
if (nla->status != SEC_I_CONTINUE_NEEDED)
return -1;
if (nla->outputBuffer.cbBuffer < 1)
return -1;
nla->negoToken.pvBuffer = nla->outputBuffer.pvBuffer;
nla->negoToken.cbBuffer = nla->outputBuffer.cbBuffer;
WLog_DBG(TAG, "Sending Authentication Token");
winpr_HexDump(TAG, WLOG_DEBUG, nla->negoToken.pvBuffer, nla->negoToken.cbBuffer);
if (!nla_send(nla))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
nla->state = NLA_STATE_NEGO_TOKEN;
return 1;
}
int nla_client_recv(rdpNla* nla)
{
int status = -1;
if (nla->state == NLA_STATE_NEGO_TOKEN)
{
nla->inputBufferDesc.ulVersion = SECBUFFER_VERSION;
nla->inputBufferDesc.cBuffers = 1;
nla->inputBufferDesc.pBuffers = &nla->inputBuffer;
nla->inputBuffer.BufferType = SECBUFFER_TOKEN;
nla->inputBuffer.pvBuffer = nla->negoToken.pvBuffer;
nla->inputBuffer.cbBuffer = nla->negoToken.cbBuffer;
nla->outputBufferDesc.ulVersion = SECBUFFER_VERSION;
nla->outputBufferDesc.cBuffers = 1;
nla->outputBufferDesc.pBuffers = &nla->outputBuffer;
nla->outputBuffer.BufferType = SECBUFFER_TOKEN;
nla->outputBuffer.cbBuffer = nla->cbMaxToken;
nla->outputBuffer.pvBuffer = malloc(nla->outputBuffer.cbBuffer);
if (!nla->outputBuffer.pvBuffer)
return -1;
nla->status = nla->table->InitializeSecurityContext(&nla->credentials,
&nla->context, nla->ServicePrincipalName, nla->fContextReq, 0,
SECURITY_NATIVE_DREP, &nla->inputBufferDesc,
0, &nla->context, &nla->outputBufferDesc, &nla->pfContextAttr, &nla->expiration);
free(nla->inputBuffer.pvBuffer);
nla->inputBuffer.pvBuffer = NULL;
if ((nla->status == SEC_I_COMPLETE_AND_CONTINUE) || (nla->status == SEC_I_COMPLETE_NEEDED))
{
if (nla->table->CompleteAuthToken)
nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (nla->status == SEC_I_COMPLETE_NEEDED)
nla->status = SEC_E_OK;
else if (nla->status == SEC_I_COMPLETE_AND_CONTINUE)
nla->status = SEC_I_CONTINUE_NEEDED;
}
if (nla->status == SEC_E_OK)
{
nla->havePubKeyAuth = TRUE;
if (nla->table->QueryContextAttributes(&nla->context, SECPKG_ATTR_SIZES, &nla->ContextSizes) != SEC_E_OK)
{
WLog_ERR(TAG, "QueryContextAttributes SECPKG_ATTR_SIZES failure");
return -1;
}
nla_encrypt_public_key_echo(nla);
}
if (nla->outputBuffer.cbBuffer < 1)
return -1;
nla->negoToken.pvBuffer = nla->outputBuffer.pvBuffer;
nla->negoToken.cbBuffer = nla->outputBuffer.cbBuffer;
WLog_DBG(TAG, "Sending Authentication Token");
winpr_HexDump(TAG, WLOG_DEBUG, nla->negoToken.pvBuffer, nla->negoToken.cbBuffer);
if (!nla_send(nla))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
nla->state = NLA_STATE_PUB_KEY_AUTH;
status = 1;
}
else if (nla->state == NLA_STATE_PUB_KEY_AUTH)
{
/* Verify Server Public Key Echo */
nla->status = nla_decrypt_public_key_echo(nla);
nla_buffer_free(nla);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "Could not verify public key echo!");
return -1;
}
/* Send encrypted credentials */
nla->status = nla_encrypt_ts_credentials(nla);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "nla_encrypt_ts_credentials status: 0x%08X", nla->status);
return -1;
}
if (!nla_send(nla))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
nla->table->FreeCredentialsHandle(&nla->credentials);
nla->table->FreeContextBuffer(nla->pPackageInfo);
nla->state = NLA_STATE_AUTH_INFO;
status = 1;
}
return status;
}
int nla_client_authenticate(rdpNla* nla)
{
wStream* s;
int status;
s = Stream_New(NULL, 4096);
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
return -1;
}
if (nla_client_begin(nla) < 1)
return -1;
while (nla->state < NLA_STATE_AUTH_INFO)
{
Stream_SetPosition(s, 0);
status = transport_read_pdu(nla->transport, s);
if (status < 0)
{
WLog_ERR(TAG, "nla_client_authenticate failure");
Stream_Free(s, TRUE);
return -1;
}
status = nla_recv_pdu(nla, s);
if (status < 0)
return -1;
}
Stream_Free(s, TRUE);
return 1;
}
/**
* Initialize NTLMSSP authentication module (server).
* @param credssp
*/
int nla_server_init(rdpNla* nla)
{
rdpTls* tls = nla->transport->tls;
if (!sspi_SecBufferAlloc(&nla->PublicKey, tls->PublicKeyLength))
{
WLog_ERR(TAG, "Failed to allocate SecBuffer for public key");
return -1;
}
CopyMemory(nla->PublicKey.pvBuffer, tls->PublicKey, tls->PublicKeyLength);
if (nla->SspiModule)
{
HMODULE hSSPI;
INIT_SECURITY_INTERFACE pInitSecurityInterface;
hSSPI = LoadLibrary(nla->SspiModule);
if (!hSSPI)
{
WLog_ERR(TAG, "Failed to load SSPI module: %s", nla->SspiModule);
return -1;
}
#ifdef UNICODE
pInitSecurityInterface = (INIT_SECURITY_INTERFACE) GetProcAddress(hSSPI, "InitSecurityInterfaceW");
#else
pInitSecurityInterface = (INIT_SECURITY_INTERFACE) GetProcAddress(hSSPI, "InitSecurityInterfaceA");
#endif
nla->table = pInitSecurityInterface();
}
else
{
nla->table = InitSecurityInterfaceEx(0);
}
nla->status = nla->table->QuerySecurityPackageInfo(NLA_PKG_NAME, &nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status: 0x%08X", nla->status);
return -1;
}
nla->cbMaxToken = nla->pPackageInfo->cbMaxToken;
nla->status = nla->table->AcquireCredentialsHandle(NULL, NLA_PKG_NAME,
SECPKG_CRED_INBOUND, NULL, NULL, NULL, NULL, &nla->credentials, &nla->expiration);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "AcquireCredentialsHandle status: 0x%08X", nla->status);
return -1;
}
nla->haveContext = FALSE;
nla->haveInputBuffer = FALSE;
nla->havePubKeyAuth = FALSE;
ZeroMemory(&nla->inputBuffer, sizeof(SecBuffer));
ZeroMemory(&nla->outputBuffer, sizeof(SecBuffer));
ZeroMemory(&nla->inputBufferDesc, sizeof(SecBufferDesc));
ZeroMemory(&nla->outputBufferDesc, sizeof(SecBufferDesc));
ZeroMemory(&nla->ContextSizes, sizeof(SecPkgContext_Sizes));
/*
* from tspkg.dll: 0x00000112
* ASC_REQ_MUTUAL_AUTH
* ASC_REQ_CONFIDENTIALITY
* ASC_REQ_ALLOCATE_MEMORY
*/
nla->fContextReq = 0;
nla->fContextReq |= ASC_REQ_MUTUAL_AUTH;
nla->fContextReq |= ASC_REQ_CONFIDENTIALITY;
nla->fContextReq |= ASC_REQ_CONNECTION;
nla->fContextReq |= ASC_REQ_USE_SESSION_KEY;
nla->fContextReq |= ASC_REQ_REPLAY_DETECT;
nla->fContextReq |= ASC_REQ_SEQUENCE_DETECT;
nla->fContextReq |= ASC_REQ_EXTENDED_ERROR;
return 1;
}
/**
* Authenticate with client using CredSSP (server).
* @param credssp
* @return 1 if authentication is successful
*/
int nla_server_authenticate(rdpNla* nla)
{
if (nla_server_init(nla) < 1)
return -1;
while (TRUE)
{
/* receive authentication token */
nla->inputBufferDesc.ulVersion = SECBUFFER_VERSION;
nla->inputBufferDesc.cBuffers = 1;
nla->inputBufferDesc.pBuffers = &nla->inputBuffer;
nla->inputBuffer.BufferType = SECBUFFER_TOKEN;
if (nla_recv(nla) < 0)
return -1;
WLog_DBG(TAG, "Receiving Authentication Token");
nla_buffer_print(nla);
nla->inputBuffer.pvBuffer = nla->negoToken.pvBuffer;
nla->inputBuffer.cbBuffer = nla->negoToken.cbBuffer;
if (nla->negoToken.cbBuffer < 1)
{
WLog_ERR(TAG, "CredSSP: invalid negoToken!");
return -1;
}
nla->outputBufferDesc.ulVersion = SECBUFFER_VERSION;
nla->outputBufferDesc.cBuffers = 1;
nla->outputBufferDesc.pBuffers = &nla->outputBuffer;
nla->outputBuffer.BufferType = SECBUFFER_TOKEN;
nla->outputBuffer.cbBuffer = nla->cbMaxToken;
nla->outputBuffer.pvBuffer = malloc(nla->outputBuffer.cbBuffer);
if (!nla->outputBuffer.pvBuffer)
return -1;
nla->status = nla->table->AcceptSecurityContext(&nla->credentials,
nla-> haveContext? &nla->context: NULL,
&nla->inputBufferDesc, nla->fContextReq, SECURITY_NATIVE_DREP, &nla->context,
&nla->outputBufferDesc, &nla->pfContextAttr, &nla->expiration);
nla->negoToken.pvBuffer = nla->outputBuffer.pvBuffer;
nla->negoToken.cbBuffer = nla->outputBuffer.cbBuffer;
if ((nla->status == SEC_I_COMPLETE_AND_CONTINUE) || (nla->status == SEC_I_COMPLETE_NEEDED))
{
if (nla->table->CompleteAuthToken)
nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (nla->status == SEC_I_COMPLETE_NEEDED)
nla->status = SEC_E_OK;
else if (nla->status == SEC_I_COMPLETE_AND_CONTINUE)
nla->status = SEC_I_CONTINUE_NEEDED;
}
if (nla->status == SEC_E_OK)
{
nla->havePubKeyAuth = TRUE;
if (nla->table->QueryContextAttributes(&nla->context, SECPKG_ATTR_SIZES, &nla->ContextSizes) != SEC_E_OK)
{
WLog_ERR(TAG, "QueryContextAttributes SECPKG_ATTR_SIZES failure");
return -1;
}
if (nla_decrypt_public_key_echo(nla) != SEC_E_OK)
{
WLog_ERR(TAG, "Error: could not verify client's public key echo");
return -1;
}
sspi_SecBufferFree(&nla->negoToken);
nla->negoToken.pvBuffer = NULL;
nla->negoToken.cbBuffer = 0;
nla_encrypt_public_key_echo(nla);
}
if ((nla->status != SEC_E_OK) && (nla->status != SEC_I_CONTINUE_NEEDED))
{
WLog_ERR(TAG, "AcceptSecurityContext status: 0x%08X", nla->status);
return -1; /* Access Denied */
}
/* send authentication token */
WLog_DBG(TAG, "Sending Authentication Token");
nla_buffer_print(nla);
if (!nla_send(nla))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
if (nla->status != SEC_I_CONTINUE_NEEDED)
break;
nla->haveContext = TRUE;
}
/* Receive encrypted credentials */
if (nla_recv(nla) < 0)
return -1;
if (nla_decrypt_ts_credentials(nla) != SEC_E_OK)
{
WLog_ERR(TAG, "Could not decrypt TSCredentials status: 0x%08X", nla->status);
return -1;
}
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "AcceptSecurityContext status: 0x%08X", nla->status);
return -1;
}
nla->status = nla->table->ImpersonateSecurityContext(&nla->context);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "ImpersonateSecurityContext status: 0x%08X", nla->status);
return -1;
}
else
{
nla->status = nla->table->RevertSecurityContext(&nla->context);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "RevertSecurityContext status: 0x%08X", nla->status);
return -1;
}
}
nla->table->FreeContextBuffer(nla->pPackageInfo);
return 1;
}
/**
* Authenticate using CredSSP.
* @param credssp
* @return 1 if authentication is successful
*/
int nla_authenticate(rdpNla* nla)
{
if (nla->server)
return nla_server_authenticate(nla);
else
return nla_client_authenticate(nla);
}
void ap_integer_increment_le(BYTE* number, int size)
{
int index;
for (index = 0; index < size; index++)
{
if (number[index] < 0xFF)
{
number[index]++;
break;
}
else
{
number[index] = 0;
continue;
}
}
}
void ap_integer_decrement_le(BYTE* number, int size)
{
int index;
for (index = 0; index < size; index++)
{
if (number[index] > 0)
{
number[index]--;
break;
}
else
{
number[index] = 0xFF;
continue;
}
}
}
SECURITY_STATUS nla_encrypt_public_key_echo(rdpNla* nla)
{
SecBuffer Buffers[2];
SecBufferDesc Message;
SECURITY_STATUS status;
int public_key_length;
public_key_length = nla->PublicKey.cbBuffer;
if (!sspi_SecBufferAlloc(&nla->pubKeyAuth, nla->ContextSizes.cbMaxSignature + public_key_length))
return SEC_E_INSUFFICIENT_MEMORY;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[1].BufferType = SECBUFFER_DATA; /* TLS Public Key */
Buffers[0].cbBuffer = nla->ContextSizes.cbMaxSignature;
Buffers[0].pvBuffer = nla->pubKeyAuth.pvBuffer;
Buffers[1].cbBuffer = public_key_length;
Buffers[1].pvBuffer = ((BYTE*) nla->pubKeyAuth.pvBuffer) + nla->ContextSizes.cbMaxSignature;
CopyMemory(Buffers[1].pvBuffer, nla->PublicKey.pvBuffer, Buffers[1].cbBuffer);
if (nla->server)
{
/* server echos the public key +1 */
ap_integer_increment_le((BYTE*) Buffers[1].pvBuffer, Buffers[1].cbBuffer);
}
Message.cBuffers = 2;
Message.ulVersion = SECBUFFER_VERSION;
Message.pBuffers = (PSecBuffer) &Buffers;
status = nla->table->EncryptMessage(&nla->context, 0, &Message, nla->sendSeqNum++);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "EncryptMessage status: 0x%08X", status);
return status;
}
return status;
}
SECURITY_STATUS nla_decrypt_public_key_echo(rdpNla* nla)
{
int length;
BYTE* buffer;
ULONG pfQOP = 0;
BYTE* public_key1;
BYTE* public_key2;
int public_key_length;
SecBuffer Buffers[2];
SecBufferDesc Message;
SECURITY_STATUS status;
if ((nla->PublicKey.cbBuffer + nla->ContextSizes.cbMaxSignature) != nla->pubKeyAuth.cbBuffer)
{
WLog_ERR(TAG, "unexpected pubKeyAuth buffer size: %d", (int) nla->pubKeyAuth.cbBuffer);
return SEC_E_INVALID_TOKEN;
}
length = nla->pubKeyAuth.cbBuffer;
buffer = (BYTE*) malloc(length);
if (!buffer)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(buffer, nla->pubKeyAuth.pvBuffer, length);
public_key_length = nla->PublicKey.cbBuffer;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[1].BufferType = SECBUFFER_DATA; /* Encrypted TLS Public Key */
Buffers[0].cbBuffer = nla->ContextSizes.cbMaxSignature;
Buffers[0].pvBuffer = buffer;
Buffers[1].cbBuffer = length - nla->ContextSizes.cbMaxSignature;
Buffers[1].pvBuffer = buffer + nla->ContextSizes.cbMaxSignature;
Message.cBuffers = 2;
Message.ulVersion = SECBUFFER_VERSION;
Message.pBuffers = (PSecBuffer) &Buffers;
status = nla->table->DecryptMessage(&nla->context, &Message, nla->recvSeqNum++, &pfQOP);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "DecryptMessage failure: 0x%08X", status);
return status;
}
public_key1 = (BYTE*) nla->PublicKey.pvBuffer;
public_key2 = (BYTE*) Buffers[1].pvBuffer;
if (!nla->server)
{
/* server echos the public key +1 */
ap_integer_decrement_le(public_key2, public_key_length);
}
if (memcmp(public_key1, public_key2, public_key_length) != 0)
{
WLog_ERR(TAG, "Could not verify server's public key echo");
WLog_ERR(TAG, "Expected (length = %d):", public_key_length);
winpr_HexDump(TAG, WLOG_ERROR, public_key1, public_key_length);
WLog_ERR(TAG, "Actual (length = %d):", public_key_length);
winpr_HexDump(TAG, WLOG_ERROR, public_key2, public_key_length);
return SEC_E_MESSAGE_ALTERED; /* DO NOT SEND CREDENTIALS! */
}
free(buffer);
return SEC_E_OK;
}
int nla_sizeof_ts_password_creds(rdpNla* nla)
{
int length = 0;
if (nla->identity)
{
length += ber_sizeof_sequence_octet_string(nla->identity->DomainLength * 2);
length += ber_sizeof_sequence_octet_string(nla->identity->UserLength * 2);
length += ber_sizeof_sequence_octet_string(nla->identity->PasswordLength * 2);
}
return length;
}
BOOL nla_read_ts_password_creds(rdpNla* nla, wStream* s)
{
int length;
if (!nla->identity)
{
WLog_ERR(TAG, "nla->identity is NULL!");
return FALSE;
}
/* TSPasswordCreds (SEQUENCE)
* Initialise to default values. */
nla->identity->Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;
nla->identity->UserLength = (UINT32) 0;
nla->identity->User = NULL;
nla->identity->DomainLength = (UINT32) 0;
nla->identity->Domain = NULL;
nla->identity->Password = NULL;
nla->identity->PasswordLength = (UINT32) 0;
if (!ber_read_sequence_tag(s, &length))
return FALSE;
/* The sequence is empty, return early,
* TSPasswordCreds (SEQUENCE) is optional. */
if (length == 0)
return TRUE;
/* [0] domainName (OCTET STRING) */
if (!ber_read_contextual_tag(s, 0, &length, TRUE) ||
!ber_read_octet_string_tag(s, &length))
{
return FALSE;
}
nla->identity->DomainLength = (UINT32) length;
if (nla->identity->DomainLength > 0)
{
nla->identity->Domain = (UINT16*) malloc(length);
if (!nla->identity->Domain)
return FALSE;
CopyMemory(nla->identity->Domain, Stream_Pointer(s), nla->identity->DomainLength);
Stream_Seek(s, nla->identity->DomainLength);
nla->identity->DomainLength /= 2;
}
/* [1] userName (OCTET STRING) */
if (!ber_read_contextual_tag(s, 1, &length, TRUE) ||
!ber_read_octet_string_tag(s, &length))
{
return FALSE;
}
nla->identity->UserLength = (UINT32) length;
if (nla->identity->UserLength > 0)
{
nla->identity->User = (UINT16 *) malloc(length);
if (!nla->identity->User)
return FALSE;
CopyMemory(nla->identity->User, Stream_Pointer(s), nla->identity->UserLength);
Stream_Seek(s, nla->identity->UserLength);
nla->identity->UserLength /= 2;
}
/* [2] password (OCTET STRING) */
if (!ber_read_contextual_tag(s, 2, &length, TRUE) ||
!ber_read_octet_string_tag(s, &length))
{
return FALSE;
}
nla->identity->PasswordLength = (UINT32) length;
if (nla->identity->PasswordLength > 0)
{
nla->identity->Password = (UINT16 *) malloc(length);
if (!nla->identity->Password)
return FALSE;
CopyMemory(nla->identity->Password, Stream_Pointer(s), nla->identity->PasswordLength);
Stream_Seek(s, nla->identity->PasswordLength);
nla->identity->PasswordLength /= 2;
}
return TRUE;
}
int nla_write_ts_password_creds(rdpNla* nla, wStream* s)
{
int size = 0;
int innerSize = nla_sizeof_ts_password_creds(nla);
/* TSPasswordCreds (SEQUENCE) */
size += ber_write_sequence_tag(s, innerSize);
if (nla->identity)
{
/* [0] domainName (OCTET STRING) */
size += ber_write_sequence_octet_string(
s, 0, (BYTE*) nla->identity->Domain,
nla->identity->DomainLength * 2);
/* [1] userName (OCTET STRING) */
size += ber_write_sequence_octet_string(
s, 1, (BYTE*) nla->identity->User,
nla->identity->UserLength * 2);
/* [2] password (OCTET STRING) */
size += ber_write_sequence_octet_string(
s, 2, (BYTE*) nla->identity->Password,
nla->identity->PasswordLength * 2);
}
return size;
}
int nla_sizeof_ts_credentials(rdpNla* nla)
{
int size = 0;
size += ber_sizeof_integer(1);
size += ber_sizeof_contextual_tag(ber_sizeof_integer(1));
size += ber_sizeof_sequence_octet_string(ber_sizeof_sequence(nla_sizeof_ts_password_creds(nla)));
return size;
}
static BOOL nla_read_ts_credentials(rdpNla* nla, PSecBuffer ts_credentials)
{
wStream* s;
int length;
int ts_password_creds_length;
BOOL ret;
s = Stream_New(ts_credentials->pvBuffer, ts_credentials->cbBuffer);
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
return FALSE;
}
/* TSCredentials (SEQUENCE) */
ret = ber_read_sequence_tag(s, &length) &&
/* [0] credType (INTEGER) */
ber_read_contextual_tag(s, 0, &length, TRUE) &&
ber_read_integer(s, NULL) &&
/* [1] credentials (OCTET STRING) */
ber_read_contextual_tag(s, 1, &length, TRUE) &&
ber_read_octet_string_tag(s, &ts_password_creds_length) &&
nla_read_ts_password_creds(nla, s);
Stream_Free(s, FALSE);
return ret;
}
int nla_write_ts_credentials(rdpNla* nla, wStream* s)
{
int size = 0;
int passwordSize;
int innerSize = nla_sizeof_ts_credentials(nla);
/* TSCredentials (SEQUENCE) */
size += ber_write_sequence_tag(s, innerSize);
/* [0] credType (INTEGER) */
size += ber_write_contextual_tag(s, 0, ber_sizeof_integer(1), TRUE);
size += ber_write_integer(s, 1);
/* [1] credentials (OCTET STRING) */
passwordSize = ber_sizeof_sequence(nla_sizeof_ts_password_creds(nla));
size += ber_write_contextual_tag(s, 1, ber_sizeof_octet_string(passwordSize), TRUE);
size += ber_write_octet_string_tag(s, passwordSize);
size += nla_write_ts_password_creds(nla, s);
return size;
}
/**
* Encode TSCredentials structure.
* @param credssp
*/
BOOL nla_encode_ts_credentials(rdpNla* nla)
{
wStream* s;
int length;
int DomainLength = 0;
int UserLength = 0;
int PasswordLength = 0;
if (nla->identity)
{
DomainLength = nla->identity->DomainLength;
UserLength = nla->identity->UserLength;
PasswordLength = nla->identity->PasswordLength;
}
if (nla->settings->DisableCredentialsDelegation && nla->identity)
{
nla->identity->DomainLength = 0;
nla->identity->UserLength = 0;
nla->identity->PasswordLength = 0;
}
length = ber_sizeof_sequence(nla_sizeof_ts_credentials(nla));
if (!sspi_SecBufferAlloc(&nla->tsCredentials, length))
{
WLog_ERR(TAG, "sspi_SecBufferAlloc failed!");
return FALSE;
}
s = Stream_New((BYTE*) nla->tsCredentials.pvBuffer, length);
if (!s)
{
sspi_SecBufferFree(&nla->tsCredentials);
WLog_ERR(TAG, "Stream_New failed!");
return FALSE;
}
nla_write_ts_credentials(nla, s);
if (nla->settings->DisableCredentialsDelegation)
{
nla->identity->DomainLength = DomainLength;
nla->identity->UserLength = UserLength;
nla->identity->PasswordLength = PasswordLength;
}
Stream_Free(s, FALSE);
return TRUE;
}
SECURITY_STATUS nla_encrypt_ts_credentials(rdpNla* nla)
{
SecBuffer Buffers[2];
SecBufferDesc Message;
SECURITY_STATUS status;
if (!nla_encode_ts_credentials(nla))
return SEC_E_INSUFFICIENT_MEMORY;
if (!sspi_SecBufferAlloc(&nla->authInfo, nla->ContextSizes.cbMaxSignature + nla->tsCredentials.cbBuffer))
return SEC_E_INSUFFICIENT_MEMORY;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[1].BufferType = SECBUFFER_DATA; /* TSCredentials */
Buffers[0].cbBuffer = nla->ContextSizes.cbMaxSignature;
Buffers[0].pvBuffer = nla->authInfo.pvBuffer;
ZeroMemory(Buffers[0].pvBuffer, Buffers[0].cbBuffer);
Buffers[1].cbBuffer = nla->tsCredentials.cbBuffer;
Buffers[1].pvBuffer = &((BYTE*) nla->authInfo.pvBuffer)[Buffers[0].cbBuffer];
CopyMemory(Buffers[1].pvBuffer, nla->tsCredentials.pvBuffer, Buffers[1].cbBuffer);
Message.cBuffers = 2;
Message.ulVersion = SECBUFFER_VERSION;
Message.pBuffers = (PSecBuffer) &Buffers;
status = nla->table->EncryptMessage(&nla->context, 0, &Message, nla->sendSeqNum++);
if (status != SEC_E_OK)
return status;
return SEC_E_OK;
}
SECURITY_STATUS nla_decrypt_ts_credentials(rdpNla* nla)
{
int length;
BYTE* buffer;
ULONG pfQOP;
SecBuffer Buffers[2];
SecBufferDesc Message;
SECURITY_STATUS status;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[1].BufferType = SECBUFFER_DATA; /* TSCredentials */
if (nla->authInfo.cbBuffer < 1)
{
WLog_ERR(TAG, "nla_decrypt_ts_credentials missing authInfo buffer");
return SEC_E_INVALID_TOKEN;
}
length = nla->authInfo.cbBuffer;
buffer = (BYTE*) malloc(length);
if (!buffer)
return SEC_E_INSUFFICIENT_MEMORY;
CopyMemory(buffer, nla->authInfo.pvBuffer, length);
Buffers[0].cbBuffer = nla->ContextSizes.cbMaxSignature;
Buffers[0].pvBuffer = buffer;
Buffers[1].cbBuffer = length - nla->ContextSizes.cbMaxSignature;
Buffers[1].pvBuffer = &buffer[nla->ContextSizes.cbMaxSignature];
Message.cBuffers = 2;
Message.ulVersion = SECBUFFER_VERSION;
Message.pBuffers = (PSecBuffer) &Buffers;
status = nla->table->DecryptMessage(&nla->context, &Message, nla->recvSeqNum++, &pfQOP);
if (status != SEC_E_OK)
return status;
if(!nla_read_ts_credentials(nla, &Buffers[1]))
{
free(buffer);
return SEC_E_INSUFFICIENT_MEMORY;
}
free(buffer);
return SEC_E_OK;
}
int nla_sizeof_nego_token(int length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
int nla_sizeof_nego_tokens(int length)
{
length = nla_sizeof_nego_token(length);
length += ber_sizeof_sequence_tag(length);
length += ber_sizeof_sequence_tag(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
int nla_sizeof_pub_key_auth(int length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
int nla_sizeof_auth_info(int length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
int nla_sizeof_ts_request(int length)
{
length += ber_sizeof_integer(2);
length += ber_sizeof_contextual_tag(3);
return length;
}
/**
* Send CredSSP message.
* @param credssp
*/
BOOL nla_send(rdpNla* nla)
{
wStream* s;
int length;
int ts_request_length;
int nego_tokens_length;
int pub_key_auth_length;
int auth_info_length;
nego_tokens_length = (nla->negoToken.cbBuffer > 0) ? nla_sizeof_nego_tokens(nla->negoToken.cbBuffer) : 0;
pub_key_auth_length = (nla->pubKeyAuth.cbBuffer > 0) ? nla_sizeof_pub_key_auth(nla->pubKeyAuth.cbBuffer) : 0;
auth_info_length = (nla->authInfo.cbBuffer > 0) ? nla_sizeof_auth_info(nla->authInfo.cbBuffer) : 0;
length = nego_tokens_length + pub_key_auth_length + auth_info_length;
ts_request_length = nla_sizeof_ts_request(length);
s = Stream_New(NULL, ber_sizeof_sequence(ts_request_length));
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
return FALSE;
}
/* TSRequest */
ber_write_sequence_tag(s, ts_request_length); /* SEQUENCE */
/* [0] version */
ber_write_contextual_tag(s, 0, 3, TRUE);
ber_write_integer(s, 2); /* INTEGER */
/* [1] negoTokens (NegoData) */
if (nego_tokens_length > 0)
{
length = nego_tokens_length;
length -= ber_write_contextual_tag(s, 1, ber_sizeof_sequence(ber_sizeof_sequence(ber_sizeof_sequence_octet_string(nla->negoToken.cbBuffer))), TRUE); /* NegoData */
length -= ber_write_sequence_tag(s, ber_sizeof_sequence(ber_sizeof_sequence_octet_string(nla->negoToken.cbBuffer))); /* SEQUENCE OF NegoDataItem */
length -= ber_write_sequence_tag(s, ber_sizeof_sequence_octet_string(nla->negoToken.cbBuffer)); /* NegoDataItem */
length -= ber_write_sequence_octet_string(s, 0, (BYTE*) nla->negoToken.pvBuffer, nla->negoToken.cbBuffer); /* OCTET STRING */
}
/* [2] authInfo (OCTET STRING) */
if (auth_info_length > 0)
{
length = auth_info_length;
length -= ber_write_sequence_octet_string(s, 2, nla->authInfo.pvBuffer, nla->authInfo.cbBuffer);
}
/* [3] pubKeyAuth (OCTET STRING) */
if (pub_key_auth_length > 0)
{
length = pub_key_auth_length;
length -= ber_write_sequence_octet_string(s, 3, nla->pubKeyAuth.pvBuffer, nla->pubKeyAuth.cbBuffer);
}
Stream_SealLength(s);
transport_write(nla->transport, s);
Stream_Free(s, TRUE);
return TRUE;
}
int nla_decode_ts_request(rdpNla* nla, wStream* s)
{
int length;
UINT32 version;
/* TSRequest */
if (!ber_read_sequence_tag(s, &length) ||
!ber_read_contextual_tag(s, 0, &length, TRUE) ||
!ber_read_integer(s, &version))
{
Stream_Free(s, TRUE);
return -1;
}
/* [1] negoTokens (NegoData) */
if (ber_read_contextual_tag(s, 1, &length, TRUE) != FALSE)
{
if (!ber_read_sequence_tag(s, &length) || /* SEQUENCE OF NegoDataItem */
!ber_read_sequence_tag(s, &length) || /* NegoDataItem */
!ber_read_contextual_tag(s, 0, &length, TRUE) || /* [0] negoToken */
!ber_read_octet_string_tag(s, &length) || /* OCTET STRING */
((int) Stream_GetRemainingLength(s)) < length)
{
Stream_Free(s, TRUE);
return -1;
}
if (!sspi_SecBufferAlloc(&nla->negoToken, length))
{
Stream_Free(s, TRUE);
return -1;
}
Stream_Read(s, nla->negoToken.pvBuffer, length);
nla->negoToken.cbBuffer = length;
}
/* [2] authInfo (OCTET STRING) */
if (ber_read_contextual_tag(s, 2, &length, TRUE) != FALSE)
{
if (!ber_read_octet_string_tag(s, &length) || /* OCTET STRING */
((int) Stream_GetRemainingLength(s)) < length)
{
Stream_Free(s, TRUE);
return -1;
}
if (!sspi_SecBufferAlloc(&nla->authInfo, length))
{
Stream_Free(s, TRUE);
return -1;
}
Stream_Read(s, nla->authInfo.pvBuffer, length);
nla->authInfo.cbBuffer = length;
}
/* [3] pubKeyAuth (OCTET STRING) */
if (ber_read_contextual_tag(s, 3, &length, TRUE) != FALSE)
{
if (!ber_read_octet_string_tag(s, &length) || /* OCTET STRING */
((int) Stream_GetRemainingLength(s)) < length)
{
Stream_Free(s, TRUE);
return -1;
}
if (!sspi_SecBufferAlloc(&nla->pubKeyAuth, length))
{
Stream_Free(s, TRUE);
return -1;
}
Stream_Read(s, nla->pubKeyAuth.pvBuffer, length);
nla->pubKeyAuth.cbBuffer = length;
}
return 1;
}
int nla_recv_pdu(rdpNla* nla, wStream* s)
{
if (nla_decode_ts_request(nla, s) < 1)
return -1;
if (nla_client_recv(nla) < 1)
return -1;
return 1;
}
int nla_recv(rdpNla* nla)
{
wStream* s;
int status;
s = Stream_New(NULL, 4096);
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
return -1;
}
status = transport_read_pdu(nla->transport, s);
if (status < 0)
{
WLog_ERR(TAG, "nla_recv() error: %d", status);
Stream_Free(s, TRUE);
return -1;
}
if (nla_decode_ts_request(nla, s) < 1)
return -1;
Stream_Free(s, TRUE);
return 1;
}
void nla_buffer_print(rdpNla* nla)
{
if (nla->negoToken.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.negoToken (length = %d):", (int) nla->negoToken.cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, nla->negoToken.pvBuffer, nla->negoToken.cbBuffer);
}
if (nla->pubKeyAuth.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.pubKeyAuth (length = %d):", (int) nla->pubKeyAuth.cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, nla->pubKeyAuth.pvBuffer, nla->pubKeyAuth.cbBuffer);
}
if (nla->authInfo.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.authInfo (length = %d):", (int) nla->authInfo.cbBuffer);
winpr_HexDump(TAG, WLOG_DEBUG, nla->authInfo.pvBuffer, nla->authInfo.cbBuffer);
}
}
void nla_buffer_free(rdpNla* nla)
{
sspi_SecBufferFree(&nla->negoToken);
sspi_SecBufferFree(&nla->pubKeyAuth);
sspi_SecBufferFree(&nla->authInfo);
}
LPTSTR nla_make_spn(const char* ServiceClass, const char* hostname)
{
DWORD status;
DWORD SpnLength;
LPTSTR hostnameX = NULL;
LPTSTR ServiceClassX = NULL;
LPTSTR ServicePrincipalName = NULL;
#ifdef UNICODE
ConvertToUnicode(CP_UTF8, 0, hostname, -1, &hostnameX, 0);
ConvertToUnicode(CP_UTF8, 0, ServiceClass, -1, &ServiceClassX, 0);
#else
hostnameX = _strdup(hostname);
ServiceClassX = _strdup(ServiceClass);
#endif
if (!hostnameX || !ServiceClassX)
{
free(hostnameX);
free(ServiceClassX);
return NULL;
}
if (!ServiceClass)
{
ServicePrincipalName = (LPTSTR) _tcsdup(hostnameX);
free(ServiceClassX);
free(hostnameX);
return ServicePrincipalName;
}
SpnLength = 0;
status = DsMakeSpn(ServiceClassX, hostnameX, NULL, 0, NULL, &SpnLength, NULL);
if (status != ERROR_BUFFER_OVERFLOW)
{
free(ServiceClassX);
free(hostnameX);
return NULL;
}
ServicePrincipalName = (LPTSTR) malloc(SpnLength * sizeof(TCHAR));
if (!ServicePrincipalName)
return NULL;
status = DsMakeSpn(ServiceClassX, hostnameX, NULL, 0, NULL, &SpnLength, ServicePrincipalName);
if (status != ERROR_SUCCESS)
{
free(ServicePrincipalName);
free(ServiceClassX);
free(hostnameX);
return NULL;
}
free(ServiceClassX);
free(hostnameX);
return ServicePrincipalName;
}
/**
* Create new CredSSP state machine.
* @param transport
* @return new CredSSP state machine.
*/
rdpNla* nla_new(freerdp* instance, rdpTransport* transport, rdpSettings* settings)
{
rdpNla* nla = (rdpNla*) calloc(1, sizeof(rdpNla));
if (!nla)
return NULL;
nla->identity = calloc(1, sizeof(SEC_WINNT_AUTH_IDENTITY));
if (!nla->identity)
{
free (nla);
return NULL;
}
nla->instance = instance;
nla->settings = settings;
nla->server = settings->ServerMode;
nla->transport = transport;
nla->sendSeqNum = 0;
nla->recvSeqNum = 0;
ZeroMemory(&nla->negoToken, sizeof(SecBuffer));
ZeroMemory(&nla->pubKeyAuth, sizeof(SecBuffer));
ZeroMemory(&nla->authInfo, sizeof(SecBuffer));
SecInvalidateHandle(&nla->context);
if (nla->server)
{
LONG status;
HKEY hKey;
DWORD dwType;
DWORD dwSize;
status = RegOpenKeyExA(HKEY_LOCAL_MACHINE, SERVER_KEY,
0, KEY_READ | KEY_WOW64_64KEY, &hKey);
if (status != ERROR_SUCCESS)
return nla;
status = RegQueryValueEx(hKey, _T("SspiModule"), NULL, &dwType, NULL, &dwSize);
if (status != ERROR_SUCCESS)
{
RegCloseKey(hKey);
return nla;
}
nla->SspiModule = (LPTSTR) malloc(dwSize + sizeof(TCHAR));
if (!nla->SspiModule)
{
RegCloseKey(hKey);
free(nla);
return NULL;
}
status = RegQueryValueEx(hKey, _T("SspiModule"), NULL, &dwType,
(BYTE*) nla->SspiModule, &dwSize);
if (status == ERROR_SUCCESS)
WLog_INFO(TAG, "Using SSPI Module: %s", nla->SspiModule);
RegCloseKey(hKey);
}
return nla;
}
/**
* Free CredSSP state machine.
* @param credssp
*/
void nla_free(rdpNla* nla)
{
if (!nla)
return;
if (nla->table)
nla->table->DeleteSecurityContext(&nla->context);
sspi_SecBufferFree(&nla->PublicKey);
sspi_SecBufferFree(&nla->tsCredentials);
free(nla->ServicePrincipalName);
nla_identity_free(nla->identity);
free(nla);
}