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FreeRDP/libfreerdp/core/nla.c
Peter Harris 63ef97a2b3 core/nla: fix order of operations 
The order of evaluation of the two sides of addition is undefined in C.
Since there is no sequence point between ber_write_contextual_tag and
ber_write_octet_string, these two functions can be called in any order.

Force the correct order by breaking the two function calls into two
separate statements.
2020-10-06 17:19:38 +02:00

2526 lines
66 KiB
C
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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* 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>
* Copyright 2016 Martin Fleisz <martin.fleisz@thincast.com>
* Copyright 2017 Dorian Ducournau <dorian.ducournau@gmail.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 <freerdp/build-config.h>
#include <freerdp/peer.h>
#include <winpr/crt.h>
#include <winpr/sam.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,
* errorCode [4] INTEGER 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 NEGO_SSP_NAME
#define TERMSRV_SPN_PREFIX "TERMSRV/"
struct rdp_nla
{
BOOL server;
NLA_STATE state;
int sendSeqNum;
int recvSeqNum;
freerdp* instance;
CtxtHandle context;
LPTSTR SspiModule;
char* SamFile;
rdpSettings* settings;
rdpTransport* transport;
UINT32 cbMaxToken;
#if defined(UNICODE)
SEC_WCHAR* packageName;
#else
SEC_CHAR* packageName;
#endif
UINT32 version;
UINT32 peerVersion;
UINT32 errorCode;
ULONG fContextReq;
ULONG pfContextAttr;
BOOL haveContext;
BOOL haveInputBuffer;
BOOL havePubKeyAuth;
SECURITY_STATUS status;
CredHandle credentials;
TimeStamp expiration;
PSecPkgInfo pPackageInfo;
SecBuffer inputBuffer;
SecBuffer outputBuffer;
SecBufferDesc inputBufferDesc;
SecBufferDesc outputBufferDesc;
SecBuffer negoToken;
SecBuffer pubKeyAuth;
SecBuffer authInfo;
SecBuffer ClientNonce;
SecBuffer PublicKey;
SecBuffer tsCredentials;
LPTSTR ServicePrincipalName;
SEC_WINNT_AUTH_IDENTITY* identity;
PSecurityFunctionTable table;
SecPkgContext_Sizes ContextSizes;
};
static BOOL nla_send(rdpNla* nla, const char* msg);
static int nla_recv(rdpNla* nla, const char* msg);
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_encrypt_public_key_hash(rdpNla* nla);
static SECURITY_STATUS nla_decrypt_public_key_echo(rdpNla* nla);
static SECURITY_STATUS nla_decrypt_public_key_hash(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)
static INLINE size_t ber_write_sequence_octet_string(wStream* stream, BYTE context,
const BYTE* value, size_t length)
{
size_t rv = ber_write_contextual_tag(stream, context, ber_sizeof_octet_string(length), TRUE);
rv += ber_write_octet_string(stream, value, length);
return rv;
}
/* CredSSP Client-To-Server Binding Hash\0 */
static const BYTE ClientServerHashMagic[] = { 0x43, 0x72, 0x65, 0x64, 0x53, 0x53, 0x50, 0x20,
0x43, 0x6C, 0x69, 0x65, 0x6E, 0x74, 0x2D, 0x54,
0x6F, 0x2D, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72,
0x20, 0x42, 0x69, 0x6E, 0x64, 0x69, 0x6E, 0x67,
0x20, 0x48, 0x61, 0x73, 0x68, 0x00 };
/* CredSSP Server-To-Client Binding Hash\0 */
static const BYTE ServerClientHashMagic[] = { 0x43, 0x72, 0x65, 0x64, 0x53, 0x53, 0x50, 0x20,
0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2D, 0x54,
0x6F, 0x2D, 0x43, 0x6C, 0x69, 0x65, 0x6E, 0x74,
0x20, 0x42, 0x69, 0x6E, 0x64, 0x69, 0x6E, 0x67,
0x20, 0x48, 0x61, 0x73, 0x68, 0x00 };
static const UINT32 NonceLength = 32;
void nla_identity_free(SEC_WINNT_AUTH_IDENTITY* identity)
{
if (identity)
{
/* Password authentication */
if (identity->User)
{
memset(identity->User, 0, identity->UserLength * 2);
free(identity->User);
}
if (identity->Password)
{
size_t len = identity->PasswordLength;
if (len > LB_PASSWORD_MAX_LENGTH) /* [pth] Password hash */
len -= LB_PASSWORD_MAX_LENGTH;
memset(identity->Password, 0, len * 2);
free(identity->Password);
}
if (identity->Domain)
{
memset(identity->Domain, 0, identity->DomainLength * 2);
free(identity->Domain);
}
}
free(identity);
}
/**
* Initialize NTLM/Kerberos SSP authentication module (client).
* @param credssp
*/
static BOOL is_empty(const char* str)
{
if (!str)
return TRUE;
if (strlen(str) == 0)
return TRUE;
return FALSE;
}
static int nla_client_init(rdpNla* nla)
{
char* spn;
size_t length;
rdpTls* tls = NULL;
BOOL PromptPassword = FALSE;
freerdp* instance = nla->instance;
rdpSettings* settings = nla->settings;
WINPR_SAM* sam;
WINPR_SAM_ENTRY* entry;
nla->state = NLA_STATE_INITIAL;
if (settings->RestrictedAdminModeRequired)
settings->DisableCredentialsDelegation = TRUE;
if (is_empty(settings->Username) ||
(is_empty(settings->Password) && is_empty((const char*)settings->RedirectionPassword)))
{
PromptPassword = TRUE;
}
if (PromptPassword && !is_empty(settings->Username))
{
sam = SamOpen(NULL, TRUE);
if (sam)
{
entry = SamLookupUserA(sam, settings->Username, strlen(settings->Username), NULL, 0);
if (entry)
{
/**
* The user could be found in SAM database.
* Use entry in SAM database later instead of prompt
*/
PromptPassword = FALSE;
SamFreeEntry(sam, entry);
}
SamClose(sam);
}
}
#ifndef _WIN32
if (PromptPassword)
{
if (settings->RestrictedAdminModeRequired)
{
if (!is_empty(settings->PasswordHash))
PromptPassword = FALSE;
}
}
#endif
if (PromptPassword)
{
if (freerdp_shall_disconnect(instance))
return 0;
if (!instance->Authenticate)
{
freerdp_set_last_error_log(instance->context,
FREERDP_ERROR_CONNECT_NO_OR_MISSING_CREDENTIALS);
return 0;
}
else
{
BOOL proceed = instance->Authenticate(instance, &settings->Username,
&settings->Password, &settings->Domain);
if (!proceed)
{
freerdp_set_last_error_log(instance->context,
FREERDP_ERROR_CONNECT_NO_OR_MISSING_CREDENTIALS);
return 0;
}
}
}
if (!settings->Username)
{
nla_identity_free(nla->identity);
nla->identity = NULL;
}
else
{
if (settings->RedirectionPassword && settings->RedirectionPasswordLength > 0)
{
if (sspi_SetAuthIdentityWithUnicodePassword(
nla->identity, settings->Username, settings->Domain,
(UINT16*)settings->RedirectionPassword,
settings->RedirectionPasswordLength / sizeof(WCHAR) - 1) < 0)
return -1;
}
else
{
BOOL usePassword = TRUE;
if (settings->RestrictedAdminModeRequired)
{
if (settings->PasswordHash)
{
if (strlen(settings->PasswordHash) == 32)
{
if (sspi_SetAuthIdentity(nla->identity, settings->Username,
settings->Domain, settings->PasswordHash) < 0)
return -1;
/**
* Increase password hash length by LB_PASSWORD_MAX_LENGTH to obtain a
* length exceeding the maximum (LB_PASSWORD_MAX_LENGTH) and use it this for
* hash identification in WinPR.
*/
nla->identity->PasswordLength += LB_PASSWORD_MAX_LENGTH;
usePassword = FALSE;
}
}
}
if (usePassword)
{
if (sspi_SetAuthIdentity(nla->identity, settings->Username, settings->Domain,
settings->Password) < 0)
return -1;
}
}
}
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 sspi 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_s(spn, length + 1, "%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);
#ifdef WITH_GSSAPI /* KERBEROS SSP */
nla->status = nla->table->QuerySecurityPackageInfo(KERBEROS_SSP_NAME, &nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
#else /* NTLM SSP */
nla->status = nla->table->QuerySecurityPackageInfo(NLA_PKG_NAME, &nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
#endif
nla->cbMaxToken = nla->pPackageInfo->cbMaxToken;
nla->packageName = nla->pPackageInfo->Name;
WLog_DBG(TAG, "%s %" PRIu32 " : packageName=%ls ; cbMaxToken=%d", __FUNCTION__, __LINE__,
nla->packageName, nla->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 %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), 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);
WLog_VRB(TAG, " InitializeSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
/* Handle kerberos context initialization failure.
* After kerberos failed initialize NTLM context */
if (nla->status == SEC_E_NO_CREDENTIALS)
{
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);
WLog_VRB(TAG, " InitializeSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
if (nla->status)
{
SECURITY_STATUS status =
nla->table->QuerySecurityPackageInfo(NTLM_SSP_NAME, &nla->pPackageInfo);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), status);
return -1;
}
nla->cbMaxToken = nla->pPackageInfo->cbMaxToken;
nla->packageName = nla->pPackageInfo->Name;
}
}
if ((nla->status == SEC_I_COMPLETE_AND_CONTINUE) || (nla->status == SEC_I_COMPLETE_NEEDED))
{
if (nla->table->CompleteAuthToken)
{
SECURITY_STATUS status;
status = nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (status != SEC_E_OK)
{
WLog_WARN(TAG, "CompleteAuthToken status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return -1;
}
}
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;
if (!nla_send(nla, "Client: Sending Authentication Token"))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
nla->state = NLA_STATE_NEGO_TOKEN;
return 1;
}
static 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);
WLog_VRB(TAG, "InitializeSecurityContext %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
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)
{
SECURITY_STATUS status;
status = nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (status != SEC_E_OK)
{
WLog_WARN(TAG, "CompleteAuthToken status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return -1;
}
}
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;
nla->status = nla->table->QueryContextAttributes(&nla->context, SECPKG_ATTR_SIZES,
&nla->ContextSizes);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG,
"QueryContextAttributes SECPKG_ATTR_SIZES failure %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
if (nla->peerVersion < 5)
nla->status = nla_encrypt_public_key_echo(nla);
else
nla->status = nla_encrypt_public_key_hash(nla);
if (nla->status != SEC_E_OK)
return -1;
}
nla->negoToken.pvBuffer = nla->outputBuffer.pvBuffer;
nla->negoToken.cbBuffer = nla->outputBuffer.cbBuffer;
if (!nla_send(nla, "Client: Sending Authentication Token"))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
if (nla->status == SEC_E_OK)
nla->state = NLA_STATE_PUB_KEY_AUTH;
status = 1;
}
else if (nla->state == NLA_STATE_PUB_KEY_AUTH)
{
/* Verify Server Public Key Echo */
if (nla->peerVersion < 5)
nla->status = nla_decrypt_public_key_echo(nla);
else
nla->status = nla_decrypt_public_key_hash(nla);
nla_buffer_free(nla);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "Could not verify public key echo %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
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 %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
if (!nla_send(nla, "Client: Sending PubKeyAuth Token"))
{
nla_buffer_free(nla);
return -1;
}
nla_buffer_free(nla);
if (SecIsValidHandle(&nla->credentials))
{
nla->table->FreeCredentialsHandle(&nla->credentials);
SecInvalidateHandle(&nla->credentials);
}
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "FreeCredentialsHandle status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
}
nla->status = nla->table->FreeContextBuffer(nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "FreeContextBuffer status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
}
if (nla->status != SEC_E_OK)
return -1;
nla->state = NLA_STATE_AUTH_INFO;
status = 1;
}
return status;
}
static 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)
{
Stream_Free(s, TRUE);
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)
{
Stream_Free(s, TRUE);
return -1;
}
}
Stream_Free(s, TRUE);
return 1;
}
/**
* Initialize NTLMSSP authentication module (server).
* @param credssp
*/
static 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 %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
nla->cbMaxToken = nla->pPackageInfo->cbMaxToken;
nla->packageName = nla->pPackageInfo->Name;
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 %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), 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
*/
static 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, "Receiving Authentication Token") < 0)
return -1;
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);
WLog_VRB(TAG, "AcceptSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
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))
{
freerdp_peer* peer = nla->instance->context->peer;
if (peer->ComputeNtlmHash)
{
SECURITY_STATUS status;
status = nla->table->SetContextAttributes(
&nla->context, SECPKG_ATTR_AUTH_NTLM_HASH_CB, peer->ComputeNtlmHash, 0);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "SetContextAttributesA(hash cb) status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
}
status = nla->table->SetContextAttributes(
&nla->context, SECPKG_ATTR_AUTH_NTLM_HASH_CB_DATA, peer, 0);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "SetContextAttributesA(hash cb data) status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
}
}
else if (nla->SamFile)
{
nla->table->SetContextAttributes(&nla->context, SECPKG_ATTR_AUTH_NTLM_SAM_FILE,
nla->SamFile, strlen(nla->SamFile) + 1);
}
if (nla->table->CompleteAuthToken)
{
SECURITY_STATUS status;
status = nla->table->CompleteAuthToken(&nla->context, &nla->outputBufferDesc);
if (status != SEC_E_OK)
{
WLog_WARN(TAG, "CompleteAuthToken status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return -1;
}
}
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)
{
if (nla->outputBuffer.cbBuffer != 0)
{
if (!nla_send(nla, "Server: Sending response"))
{
nla_buffer_free(nla);
return -1;
}
if (nla_recv(nla, "Receiving pubkey Token") < 0)
return -1;
}
nla->havePubKeyAuth = TRUE;
nla->status = nla->table->QueryContextAttributes(&nla->context, SECPKG_ATTR_SIZES,
&nla->ContextSizes);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG,
"QueryContextAttributes SECPKG_ATTR_SIZES failure %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
if (nla->peerVersion < 5)
nla->status = nla_decrypt_public_key_echo(nla);
else
nla->status = nla_decrypt_public_key_hash(nla);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG,
"Error: could not verify client's public key echo %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
sspi_SecBufferFree(&nla->negoToken);
nla->negoToken.pvBuffer = NULL;
nla->negoToken.cbBuffer = 0;
if (nla->peerVersion < 5)
nla->status = nla_encrypt_public_key_echo(nla);
else
nla->status = nla_encrypt_public_key_hash(nla);
if (nla->status != SEC_E_OK)
return -1;
}
if ((nla->status != SEC_E_OK) && (nla->status != SEC_I_CONTINUE_NEEDED))
{
/* Special handling of these specific error codes as NTSTATUS_FROM_WIN32
unfortunately does not map directly to the corresponding NTSTATUS values
*/
switch (GetLastError())
{
case ERROR_PASSWORD_MUST_CHANGE:
nla->errorCode = STATUS_PASSWORD_MUST_CHANGE;
break;
case ERROR_PASSWORD_EXPIRED:
nla->errorCode = STATUS_PASSWORD_EXPIRED;
break;
case ERROR_ACCOUNT_DISABLED:
nla->errorCode = STATUS_ACCOUNT_DISABLED;
break;
default:
nla->errorCode = NTSTATUS_FROM_WIN32(GetLastError());
break;
}
WLog_ERR(TAG, "AcceptSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
nla_send(nla, "Server: Sending AcceptSecurityContext error status");
return -1; /* Access Denied */
}
/* send authentication token */
if (!nla_send(nla, "Server: Sending Authentication Token"))
{
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, "Receive Encryption Credentials") < 0)
return -1;
nla->status = nla_decrypt_ts_credentials(nla);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "Could not decrypt TSCredentials status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
nla->status = nla->table->ImpersonateSecurityContext(&nla->context);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "ImpersonateSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
else
{
nla->status = nla->table->RevertSecurityContext(&nla->context);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "RevertSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
}
nla->status = nla->table->FreeContextBuffer(nla->pPackageInfo);
if (nla->status != SEC_E_OK)
{
WLog_ERR(TAG, "DeleteSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
return -1;
}
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);
}
static 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;
}
}
}
static 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] = { { 0 } };
SecBufferDesc Message;
SECURITY_STATUS status;
ULONG public_key_length;
const BOOL krb =
(_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
const BOOL nego = (_tcsncmp(nla->packageName, NEGO_SSP_NAME, ARRAYSIZE(NEGO_SSP_NAME)) == 0);
const BOOL ntlm = (_tcsncmp(nla->packageName, NTLM_SSP_NAME, ARRAYSIZE(NTLM_SSP_NAME)) == 0);
public_key_length = nla->PublicKey.cbBuffer;
sspi_SecBufferFree(&nla->pubKeyAuth);
if (!sspi_SecBufferAlloc(&nla->pubKeyAuth,
public_key_length + nla->ContextSizes.cbSecurityTrailer))
return SEC_E_INSUFFICIENT_MEMORY;
if (krb)
{
Message.cBuffers = 1;
Buffers[0].BufferType = SECBUFFER_DATA; /* TLS Public Key */
Buffers[0].cbBuffer = public_key_length;
Buffers[0].pvBuffer = nla->pubKeyAuth.pvBuffer;
CopyMemory(Buffers[0].pvBuffer, nla->PublicKey.pvBuffer, Buffers[0].cbBuffer);
}
else if (ntlm || nego)
{
Message.cBuffers = 2;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = nla->ContextSizes.cbSecurityTrailer;
Buffers[0].pvBuffer = nla->pubKeyAuth.pvBuffer;
Buffers[1].BufferType = SECBUFFER_DATA; /* TLS Public Key */
Buffers[1].cbBuffer = public_key_length;
Buffers[1].pvBuffer =
((BYTE*)nla->pubKeyAuth.pvBuffer) + nla->ContextSizes.cbSecurityTrailer;
CopyMemory(Buffers[1].pvBuffer, nla->PublicKey.pvBuffer, Buffers[1].cbBuffer);
}
if (!krb && nla->server)
{
/* server echos the public key +1 */
ap_integer_increment_le((BYTE*)Buffers[1].pvBuffer, Buffers[1].cbBuffer);
}
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 %s [0x%08" PRIX32 "]", GetSecurityStatusString(status),
status);
return status;
}
if (Message.cBuffers == 2 && Buffers[0].cbBuffer < nla->ContextSizes.cbSecurityTrailer)
{
/* IMPORTANT: EncryptMessage may not use all the signature space, so we need to shrink the
* excess between the buffers */
MoveMemory(((BYTE*)Buffers[0].pvBuffer) + Buffers[0].cbBuffer, Buffers[1].pvBuffer,
Buffers[1].cbBuffer);
nla->pubKeyAuth.cbBuffer = Buffers[0].cbBuffer + Buffers[1].cbBuffer;
}
return status;
}
SECURITY_STATUS nla_encrypt_public_key_hash(rdpNla* nla)
{
SecBuffer Buffers[2] = { { 0 } };
SecBufferDesc Message;
SECURITY_STATUS status = SEC_E_INTERNAL_ERROR;
WINPR_DIGEST_CTX* sha256 = NULL;
const BOOL krb =
(_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
const ULONG auth_data_length =
(nla->ContextSizes.cbSecurityTrailer + WINPR_SHA256_DIGEST_LENGTH);
const BYTE* hashMagic = nla->server ? ServerClientHashMagic : ClientServerHashMagic;
const size_t hashSize =
nla->server ? sizeof(ServerClientHashMagic) : sizeof(ClientServerHashMagic);
sspi_SecBufferFree(&nla->pubKeyAuth);
if (!sspi_SecBufferAlloc(&nla->pubKeyAuth, auth_data_length))
{
status = SEC_E_INSUFFICIENT_MEMORY;
goto out;
}
/* generate SHA256 of following data: ClientServerHashMagic, Nonce, SubjectPublicKey */
if (!(sha256 = winpr_Digest_New()))
goto out;
if (!winpr_Digest_Init(sha256, WINPR_MD_SHA256))
goto out;
/* include trailing \0 from hashMagic */
if (!winpr_Digest_Update(sha256, hashMagic, hashSize))
goto out;
if (!winpr_Digest_Update(sha256, nla->ClientNonce.pvBuffer, nla->ClientNonce.cbBuffer))
goto out;
/* SubjectPublicKey */
if (!winpr_Digest_Update(sha256, nla->PublicKey.pvBuffer, nla->PublicKey.cbBuffer))
goto out;
if (krb)
{
Message.cBuffers = 1;
Buffers[0].BufferType = SECBUFFER_DATA; /* SHA256 hash */
Buffers[0].cbBuffer = WINPR_SHA256_DIGEST_LENGTH;
Buffers[0].pvBuffer = nla->pubKeyAuth.pvBuffer;
if (!winpr_Digest_Final(sha256, Buffers[0].pvBuffer, Buffers[0].cbBuffer))
goto out;
}
else
{
Message.cBuffers = 2;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = nla->ContextSizes.cbSecurityTrailer;
Buffers[0].pvBuffer = nla->pubKeyAuth.pvBuffer;
Buffers[1].BufferType = SECBUFFER_DATA; /* SHA256 hash */
Buffers[1].cbBuffer = WINPR_SHA256_DIGEST_LENGTH;
Buffers[1].pvBuffer =
((BYTE*)nla->pubKeyAuth.pvBuffer) + nla->ContextSizes.cbSecurityTrailer;
if (!winpr_Digest_Final(sha256, Buffers[1].pvBuffer, Buffers[1].cbBuffer))
goto out;
}
Message.pBuffers = (PSecBuffer)&Buffers;
Message.ulVersion = SECBUFFER_VERSION;
status = nla->table->EncryptMessage(&nla->context, 0, &Message, nla->sendSeqNum++);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "EncryptMessage status %s [0x%08" PRIX32 "]", GetSecurityStatusString(status),
status);
goto out;
}
if (Message.cBuffers == 2 && Buffers[0].cbBuffer < nla->ContextSizes.cbSecurityTrailer)
{
/* IMPORTANT: EncryptMessage may not use all the signature space, so we need to shrink the
* excess between the buffers */
MoveMemory(((BYTE*)Buffers[0].pvBuffer) + Buffers[0].cbBuffer, Buffers[1].pvBuffer,
Buffers[1].cbBuffer);
nla->pubKeyAuth.cbBuffer = Buffers[0].cbBuffer + Buffers[1].cbBuffer;
}
out:
winpr_Digest_Free(sha256);
return status;
}
SECURITY_STATUS nla_decrypt_public_key_echo(rdpNla* nla)
{
ULONG length;
BYTE* buffer = NULL;
ULONG pfQOP = 0;
BYTE* public_key1 = NULL;
BYTE* public_key2 = NULL;
ULONG public_key_length = 0;
int signature_length;
SecBuffer Buffers[2] = { { 0 } };
SecBufferDesc Message;
BOOL krb, ntlm, nego;
SECURITY_STATUS status = SEC_E_INVALID_TOKEN;
if (!nla)
goto fail;
krb = (_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
nego = (_tcsncmp(nla->packageName, NEGO_SSP_NAME, ARRAYSIZE(NEGO_SSP_NAME)) == 0);
ntlm = (_tcsncmp(nla->packageName, NTLM_SSP_NAME, ARRAYSIZE(NTLM_SSP_NAME)) == 0);
signature_length = nla->pubKeyAuth.cbBuffer - nla->PublicKey.cbBuffer;
if ((signature_length < 0) || ((UINT32)signature_length > nla->ContextSizes.cbSecurityTrailer))
{
WLog_ERR(TAG, "unexpected pubKeyAuth buffer size: %" PRIu32 "", nla->pubKeyAuth.cbBuffer);
goto fail;
}
length = nla->pubKeyAuth.cbBuffer;
buffer = (BYTE*)malloc(length);
if (!buffer)
{
status = SEC_E_INSUFFICIENT_MEMORY;
goto fail;
}
if (krb)
{
CopyMemory(buffer, nla->pubKeyAuth.pvBuffer, length);
Buffers[0].BufferType = SECBUFFER_DATA; /* Wrapped and encrypted TLS Public Key */
Buffers[0].cbBuffer = length;
Buffers[0].pvBuffer = buffer;
Message.cBuffers = 1;
}
else if (ntlm || nego)
{
CopyMemory(buffer, nla->pubKeyAuth.pvBuffer, length);
public_key_length = nla->PublicKey.cbBuffer;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = signature_length;
Buffers[0].pvBuffer = buffer;
Buffers[1].BufferType = SECBUFFER_DATA; /* Encrypted TLS Public Key */
Buffers[1].cbBuffer = length - signature_length;
Buffers[1].pvBuffer = buffer + signature_length;
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 %s [%08" PRIX32 "]", GetSecurityStatusString(status),
status);
goto fail;
}
if (krb)
{
public_key1 = public_key2 = (BYTE*)nla->pubKeyAuth.pvBuffer;
public_key_length = length;
}
else if (ntlm || nego)
{
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 (!public_key1 || !public_key2 || memcmp(public_key1, public_key2, public_key_length) != 0)
{
WLog_ERR(TAG, "Could not verify server's public key echo");
#if defined(WITH_DEBUG_NLA)
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);
#endif
status = SEC_E_MESSAGE_ALTERED; /* DO NOT SEND CREDENTIALS! */
goto fail;
}
status = SEC_E_OK;
fail:
free(buffer);
return status;
}
SECURITY_STATUS nla_decrypt_public_key_hash(rdpNla* nla)
{
unsigned long length;
BYTE* buffer = NULL;
ULONG pfQOP = 0;
int signature_length;
SecBuffer Buffers[2] = { { 0 } };
SecBufferDesc Message;
WINPR_DIGEST_CTX* sha256 = NULL;
BYTE serverClientHash[WINPR_SHA256_DIGEST_LENGTH];
SECURITY_STATUS status = SEC_E_INVALID_TOKEN;
const BOOL krb =
(_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
const BYTE* hashMagic = nla->server ? ClientServerHashMagic : ServerClientHashMagic;
const size_t hashSize =
nla->server ? sizeof(ClientServerHashMagic) : sizeof(ServerClientHashMagic);
signature_length = nla->pubKeyAuth.cbBuffer - WINPR_SHA256_DIGEST_LENGTH;
if ((signature_length < 0) || (signature_length > (int)nla->ContextSizes.cbSecurityTrailer))
{
WLog_ERR(TAG, "unexpected pubKeyAuth buffer size: %" PRIu32 "", nla->pubKeyAuth.cbBuffer);
goto fail;
}
length = nla->pubKeyAuth.cbBuffer;
buffer = (BYTE*)malloc(length);
if (!buffer)
{
status = SEC_E_INSUFFICIENT_MEMORY;
goto fail;
}
if (krb)
{
CopyMemory(buffer, nla->pubKeyAuth.pvBuffer, length);
Buffers[0].BufferType = SECBUFFER_DATA; /* Encrypted Hash */
Buffers[0].cbBuffer = length;
Buffers[0].pvBuffer = buffer;
Message.cBuffers = 1;
}
else
{
CopyMemory(buffer, nla->pubKeyAuth.pvBuffer, length);
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = signature_length;
Buffers[0].pvBuffer = buffer;
Buffers[1].BufferType = SECBUFFER_DATA; /* Encrypted Hash */
Buffers[1].cbBuffer = WINPR_SHA256_DIGEST_LENGTH;
Buffers[1].pvBuffer = buffer + signature_length;
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 %s [%08" PRIX32 "]", GetSecurityStatusString(status),
status);
goto fail;
}
/* generate SHA256 of following data: ServerClientHashMagic, Nonce, SubjectPublicKey */
if (!(sha256 = winpr_Digest_New()))
goto fail;
if (!winpr_Digest_Init(sha256, WINPR_MD_SHA256))
goto fail;
/* include trailing \0 from hashMagic */
if (!winpr_Digest_Update(sha256, hashMagic, hashSize))
goto fail;
if (!winpr_Digest_Update(sha256, nla->ClientNonce.pvBuffer, nla->ClientNonce.cbBuffer))
goto fail;
/* SubjectPublicKey */
if (!winpr_Digest_Update(sha256, nla->PublicKey.pvBuffer, nla->PublicKey.cbBuffer))
goto fail;
if (!winpr_Digest_Final(sha256, serverClientHash, sizeof(serverClientHash)))
goto fail;
/* verify hash */
if (memcmp(serverClientHash, Buffers[krb ? 0 : 1].pvBuffer, WINPR_SHA256_DIGEST_LENGTH) != 0)
{
WLog_ERR(TAG, "Could not verify server's hash");
status = SEC_E_MESSAGE_ALTERED; /* DO NOT SEND CREDENTIALS! */
goto fail;
}
status = SEC_E_OK;
fail:
free(buffer);
winpr_Digest_Free(sha256);
return status;
}
static size_t nla_sizeof_ts_password_creds(rdpNla* nla)
{
size_t 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;
}
static size_t nla_sizeof_ts_credentials(rdpNla* nla)
{
size_t 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;
}
BOOL nla_read_ts_password_creds(rdpNla* nla, wStream* s)
{
size_t 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;
}
static size_t nla_write_ts_password_creds(rdpNla* nla, wStream* s)
{
size_t size = 0;
size_t 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;
}
static BOOL nla_read_ts_credentials(rdpNla* nla, PSecBuffer ts_credentials)
{
wStream* s;
size_t length;
size_t ts_password_creds_length = 0;
BOOL ret;
if (!ts_credentials || !ts_credentials->pvBuffer)
return FALSE;
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;
}
static size_t nla_write_ts_credentials(rdpNla* nla, wStream* s)
{
size_t size = 0;
size_t passwordSize;
size_t 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
*/
static BOOL nla_encode_ts_credentials(rdpNla* nla)
{
wStream* s;
size_t length;
int DomainLength = 0;
int UserLength = 0;
int PasswordLength = 0;
if (nla->identity)
{
/* TSPasswordCreds */
DomainLength = nla->identity->DomainLength;
UserLength = nla->identity->UserLength;
PasswordLength = nla->identity->PasswordLength;
}
if (nla->settings->DisableCredentialsDelegation && nla->identity)
{
/* TSPasswordCreds */
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)
{
/* TSPasswordCreds */
nla->identity->DomainLength = DomainLength;
nla->identity->UserLength = UserLength;
nla->identity->PasswordLength = PasswordLength;
}
Stream_Free(s, FALSE);
return TRUE;
}
static SECURITY_STATUS nla_encrypt_ts_credentials(rdpNla* nla)
{
SecBuffer Buffers[2] = { { 0 } };
SecBufferDesc Message;
SECURITY_STATUS status;
const BOOL krb =
(_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
const BOOL nego = (_tcsncmp(nla->packageName, NEGO_SSP_NAME, ARRAYSIZE(NEGO_SSP_NAME)) == 0);
const BOOL ntlm = (_tcsncmp(nla->packageName, NTLM_SSP_NAME, ARRAYSIZE(NTLM_SSP_NAME)) == 0);
if (!nla_encode_ts_credentials(nla))
return SEC_E_INSUFFICIENT_MEMORY;
if (!sspi_SecBufferAlloc(&nla->authInfo,
nla->tsCredentials.cbBuffer + nla->ContextSizes.cbSecurityTrailer))
return SEC_E_INSUFFICIENT_MEMORY;
if (krb)
{
Buffers[0].BufferType = SECBUFFER_DATA; /* TSCredentials */
Buffers[0].cbBuffer = nla->tsCredentials.cbBuffer;
Buffers[0].pvBuffer = nla->authInfo.pvBuffer;
CopyMemory(Buffers[0].pvBuffer, nla->tsCredentials.pvBuffer, Buffers[0].cbBuffer);
Message.cBuffers = 1;
}
else if (ntlm || nego)
{
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = nla->ContextSizes.cbSecurityTrailer;
Buffers[0].pvBuffer = nla->authInfo.pvBuffer;
MoveMemory(Buffers[0].pvBuffer, nla->authInfo.pvBuffer, Buffers[0].cbBuffer);
Buffers[1].BufferType = SECBUFFER_DATA; /* TSCredentials */
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)
{
WLog_ERR(TAG, "EncryptMessage failure %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return status;
}
if (Message.cBuffers == 2 && Buffers[0].cbBuffer < nla->ContextSizes.cbSecurityTrailer)
{
/* IMPORTANT: EncryptMessage may not use all the signature space, so we need to shrink the
* excess between the buffers */
MoveMemory(((BYTE*)Buffers[0].pvBuffer) + Buffers[0].cbBuffer, Buffers[1].pvBuffer,
Buffers[1].cbBuffer);
nla->authInfo.cbBuffer = Buffers[0].cbBuffer + Buffers[1].cbBuffer;
}
return SEC_E_OK;
}
static SECURITY_STATUS nla_decrypt_ts_credentials(rdpNla* nla)
{
int length;
BYTE* buffer;
ULONG pfQOP;
SecBuffer Buffers[2] = { { 0 } };
SecBufferDesc Message;
SECURITY_STATUS status;
const BOOL krb =
(_tcsncmp(nla->packageName, KERBEROS_SSP_NAME, ARRAYSIZE(KERBEROS_SSP_NAME)) == 0);
const BOOL nego = (_tcsncmp(nla->packageName, NEGO_SSP_NAME, ARRAYSIZE(NEGO_SSP_NAME)) == 0);
const BOOL ntlm = (_tcsncmp(nla->packageName, NTLM_SSP_NAME, ARRAYSIZE(NTLM_SSP_NAME)) == 0);
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;
if (krb)
{
CopyMemory(buffer, nla->authInfo.pvBuffer, length);
Buffers[0].BufferType = SECBUFFER_DATA; /* Wrapped and encrypted TSCredentials */
Buffers[0].cbBuffer = length;
Buffers[0].pvBuffer = buffer;
Message.cBuffers = 1;
}
else if (ntlm || nego)
{
CopyMemory(buffer, nla->authInfo.pvBuffer, length);
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = nla->ContextSizes.cbSecurityTrailer;
Buffers[0].pvBuffer = buffer;
Buffers[1].BufferType = SECBUFFER_DATA; /* TSCredentials */
Buffers[1].cbBuffer = length - nla->ContextSizes.cbSecurityTrailer;
Buffers[1].pvBuffer = &buffer[Buffers[0].cbBuffer];
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 %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
free(buffer);
return status;
}
if (!nla_read_ts_credentials(nla, &Buffers[1]))
{
free(buffer);
return SEC_E_INSUFFICIENT_MEMORY;
}
free(buffer);
return SEC_E_OK;
}
static size_t nla_sizeof_nego_token(size_t length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_nego_tokens(size_t 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;
}
static size_t nla_sizeof_pub_key_auth(size_t length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_auth_info(size_t length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_client_nonce(size_t length)
{
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_ts_request(size_t length)
{
length += ber_sizeof_integer(2);
length += ber_sizeof_contextual_tag(3);
return length;
}
/**
* Send CredSSP message.
* @param credssp
*/
BOOL nla_send(rdpNla* nla, const char* msg)
{
BOOL rc = TRUE;
wStream* s;
size_t length;
size_t ts_request_length;
size_t nego_tokens_length = 0;
size_t pub_key_auth_length = 0;
size_t auth_info_length = 0;
size_t error_code_context_length = 0;
size_t error_code_length = 0;
size_t client_nonce_length = 0;
WLog_DBG(TAG, "%s", msg);
nla_buffer_print(nla);
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;
client_nonce_length =
(nla->ClientNonce.cbBuffer > 0) ? nla_sizeof_client_nonce(nla->ClientNonce.cbBuffer) : 0;
if (nla->peerVersion >= 3 && nla->peerVersion != 5 && nla->errorCode != 0)
{
error_code_length = ber_sizeof_integer(nla->errorCode);
error_code_context_length = ber_sizeof_contextual_tag(error_code_length);
}
length = nego_tokens_length + pub_key_auth_length + auth_info_length +
error_code_context_length + error_code_length + client_nonce_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, nla->version); /* INTEGER */
/* [1] negoTokens (NegoData) */
if (nego_tokens_length > 0)
{
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 */
if (length != nego_tokens_length)
{
Stream_Free(s, TRUE);
return FALSE;
}
}
/* [2] authInfo (OCTET STRING) */
if (auth_info_length > 0)
{
if (ber_write_sequence_octet_string(s, 2, nla->authInfo.pvBuffer, nla->authInfo.cbBuffer) !=
auth_info_length)
{
Stream_Free(s, TRUE);
return FALSE;
}
}
/* [3] pubKeyAuth (OCTET STRING) */
if (pub_key_auth_length > 0)
{
if (ber_write_sequence_octet_string(s, 3, nla->pubKeyAuth.pvBuffer,
nla->pubKeyAuth.cbBuffer) != pub_key_auth_length)
{
Stream_Free(s, TRUE);
return FALSE;
}
}
/* [4] errorCode (INTEGER) */
if (error_code_length > 0)
{
ber_write_contextual_tag(s, 4, error_code_length, TRUE);
ber_write_integer(s, nla->errorCode);
}
/* [5] clientNonce (OCTET STRING) */
if (client_nonce_length > 0)
{
if (ber_write_sequence_octet_string(s, 5, nla->ClientNonce.pvBuffer,
nla->ClientNonce.cbBuffer) != client_nonce_length)
{
Stream_Free(s, TRUE);
return FALSE;
}
}
Stream_SealLength(s);
if (transport_write(nla->transport, s) < 0)
rc = FALSE;
Stream_Free(s, TRUE);
return rc;
}
static int nla_decode_ts_request(rdpNla* nla, wStream* s)
{
size_t length;
UINT32 version = 0;
/* TSRequest */
if (!ber_read_sequence_tag(s, &length) || !ber_read_contextual_tag(s, 0, &length, TRUE) ||
!ber_read_integer(s, &version))
{
return -1;
}
if (nla->peerVersion == 0)
{
WLog_DBG(TAG, "CredSSP protocol support %" PRIu32 ", peer supports %" PRIu32, nla->version,
version);
nla->peerVersion = version;
}
/* if the peer suddenly changed its version - kick it */
if (nla->peerVersion != version)
{
WLog_ERR(TAG, "CredSSP peer changed protocol version from %" PRIu32 " to %" PRIu32,
nla->peerVersion, version);
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 */
Stream_GetRemainingLength(s) < length)
{
return -1;
}
sspi_SecBufferFree(&nla->negoToken);
if (!sspi_SecBufferAlloc(&nla->negoToken, length))
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 */
Stream_GetRemainingLength(s) < length)
return -1;
if (!sspi_SecBufferAlloc(&nla->authInfo, length))
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 */
Stream_GetRemainingLength(s) < length)
return -1;
sspi_SecBufferFree(&nla->pubKeyAuth);
if (!sspi_SecBufferAlloc(&nla->pubKeyAuth, length))
return -1;
Stream_Read(s, nla->pubKeyAuth.pvBuffer, length);
nla->pubKeyAuth.cbBuffer = length;
}
/* [4] errorCode (INTEGER) */
if (nla->peerVersion >= 3)
{
if (ber_read_contextual_tag(s, 4, &length, TRUE) != FALSE)
{
if (!ber_read_integer(s, &nla->errorCode))
return -1;
WLog_WARN(TAG, "SPNEGO received NTSTATUS: %s [0x%08" PRIX32 "] from server",
GetSecurityStatusString(nla->errorCode), nla->errorCode);
}
if (nla->peerVersion >= 5)
{
if (ber_read_contextual_tag(s, 5, &length, TRUE) != FALSE)
{
if (!ber_read_octet_string_tag(s, &length) || /* OCTET STRING */
Stream_GetRemainingLength(s) < length)
return -1;
sspi_SecBufferFree(&nla->ClientNonce);
if (!sspi_SecBufferAlloc(&nla->ClientNonce, length))
return -1;
Stream_Read(s, nla->ClientNonce.pvBuffer, length);
nla->ClientNonce.cbBuffer = length;
}
}
}
return 1;
}
int nla_recv_pdu(rdpNla* nla, wStream* s)
{
if (nla_decode_ts_request(nla, s) < 1)
return -1;
if (nla->errorCode)
{
UINT32 code;
switch (nla->errorCode)
{
case STATUS_PASSWORD_MUST_CHANGE:
code = FREERDP_ERROR_CONNECT_PASSWORD_MUST_CHANGE;
break;
case STATUS_PASSWORD_EXPIRED:
code = FREERDP_ERROR_CONNECT_PASSWORD_EXPIRED;
break;
case STATUS_ACCOUNT_DISABLED:
code = FREERDP_ERROR_CONNECT_ACCOUNT_DISABLED;
break;
case STATUS_LOGON_FAILURE:
code = FREERDP_ERROR_CONNECT_LOGON_FAILURE;
break;
case STATUS_WRONG_PASSWORD:
code = FREERDP_ERROR_CONNECT_WRONG_PASSWORD;
break;
case STATUS_ACCESS_DENIED:
code = FREERDP_ERROR_CONNECT_ACCESS_DENIED;
break;
case STATUS_ACCOUNT_RESTRICTION:
code = FREERDP_ERROR_CONNECT_ACCOUNT_RESTRICTION;
break;
case STATUS_ACCOUNT_LOCKED_OUT:
code = FREERDP_ERROR_CONNECT_ACCOUNT_LOCKED_OUT;
break;
case STATUS_ACCOUNT_EXPIRED:
code = FREERDP_ERROR_CONNECT_ACCOUNT_EXPIRED;
break;
case STATUS_LOGON_TYPE_NOT_GRANTED:
code = FREERDP_ERROR_CONNECT_LOGON_TYPE_NOT_GRANTED;
break;
default:
WLog_ERR(TAG, "SPNEGO failed with NTSTATUS: %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->errorCode), nla->errorCode);
code = FREERDP_ERROR_AUTHENTICATION_FAILED;
break;
}
freerdp_set_last_error_log(nla->instance->context, code);
return -1;
}
if (nla_client_recv(nla) < 1)
return -1;
return 1;
}
int nla_recv(rdpNla* nla, const char* msg)
{
wStream* s;
int status;
s = Stream_New(NULL, 4096);
if (!s)
{
WLog_ERR(TAG, "[%s] Stream_New failed!", __FUNCTION__);
return -1;
}
status = transport_read_pdu(nla->transport, s);
if (status < 0)
{
WLog_ERR(TAG, "[%s] error: %d", __FUNCTION__, status);
Stream_Free(s, TRUE);
return -1;
}
if (nla_decode_ts_request(nla, s) < 1)
{
WLog_ERR(TAG, "[%s] Invalid data received, aborting", __FUNCTION__);
Stream_Free(s, TRUE);
return -1;
}
Stream_Free(s, TRUE);
WLog_DBG(TAG, "[%s] %s", __FUNCTION__, msg);
nla_buffer_print(nla);
return 1;
}
void nla_buffer_print(rdpNla* nla)
{
if (nla->negoToken.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.negoToken (length = %" PRIu32 "):", nla->negoToken.cbBuffer);
#if defined(WITH_DEBUG_NLA)
winpr_HexDump(TAG, WLOG_DEBUG, nla->negoToken.pvBuffer, nla->negoToken.cbBuffer);
#endif
}
if (nla->pubKeyAuth.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.pubKeyAuth (length = %" PRIu32 "):", nla->pubKeyAuth.cbBuffer);
#if defined(WITH_DEBUG_NLA)
winpr_HexDump(TAG, WLOG_DEBUG, nla->pubKeyAuth.pvBuffer, nla->pubKeyAuth.cbBuffer);
#endif
}
if (nla->authInfo.cbBuffer > 0)
{
WLog_DBG(TAG, "NLA.authInfo (length = %" PRIu32 "):", nla->authInfo.cbBuffer);
#if defined(WITH_DEBUG_NLA)
winpr_HexDump(TAG, WLOG_DEBUG, nla->authInfo.pvBuffer, nla->authInfo.cbBuffer);
#endif
}
}
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)calloc(SpnLength, sizeof(TCHAR));
if (!ServicePrincipalName)
{
free(ServiceClassX);
free(hostnameX);
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;
nla->version = 6;
SecInvalidateHandle(&nla->context);
if (settings->NtlmSamFile)
{
nla->SamFile = _strdup(settings->NtlmSamFile);
if (!nla->SamFile)
goto cleanup;
}
/* init to 0 or we end up freeing a bad pointer if the alloc fails */
if (!sspi_SecBufferAlloc(&nla->ClientNonce, NonceLength))
goto cleanup;
/* generate random 32-byte nonce */
if (winpr_RAND(nla->ClientNonce.pvBuffer, NonceLength) < 0)
goto cleanup;
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);
goto cleanup;
}
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;
cleanup:
nla_free(nla);
return NULL;
}
/**
* Free CredSSP state machine.
* @param credssp
*/
void nla_free(rdpNla* nla)
{
if (!nla)
return;
if (nla->table)
{
SECURITY_STATUS status;
if (SecIsValidHandle(&nla->credentials))
{
status = nla->table->FreeCredentialsHandle(&nla->credentials);
if (status != SEC_E_OK)
{
WLog_WARN(TAG, "FreeCredentialsHandle status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
}
SecInvalidateHandle(&nla->credentials);
}
status = nla->table->DeleteSecurityContext(&nla->context);
if (status != SEC_E_OK)
{
WLog_WARN(TAG, "DeleteSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
}
}
free(nla->SamFile);
nla->SamFile = NULL;
sspi_SecBufferFree(&nla->ClientNonce);
sspi_SecBufferFree(&nla->PublicKey);
sspi_SecBufferFree(&nla->tsCredentials);
free(nla->ServicePrincipalName);
nla_identity_free(nla->identity);
nla_buffer_free(nla);
free(nla);
}
SEC_WINNT_AUTH_IDENTITY* nla_get_identity(rdpNla* nla)
{
if (!nla)
return NULL;
return nla->identity;
}
NLA_STATE nla_get_state(rdpNla* nla)
{
if (!nla)
return NLA_STATE_FINAL;
return nla->state;
}
BOOL nla_set_state(rdpNla* nla, NLA_STATE state)
{
if (!nla)
return FALSE;
nla->state = state;
return TRUE;
}
BOOL nla_set_service_principal(rdpNla* nla, LPSTR principal)
{
if (!nla || !principal)
return FALSE;
nla->ServicePrincipalName = principal;
return TRUE;
}
BOOL nla_impersonate(rdpNla* nla)
{
if (!nla)
return FALSE;
if (!nla->table || !nla->table->ImpersonateSecurityContext)
return FALSE;
return (nla->table->ImpersonateSecurityContext(&nla->context) == SEC_E_OK);
}
BOOL nla_revert_to_self(rdpNla* nla)
{
if (!nla)
return FALSE;
if (!nla->table || !nla->table->RevertSecurityContext)
return FALSE;
return (nla->table->RevertSecurityContext(&nla->context) == SEC_E_OK);
}
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