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FreeRDP/libfreerdp/core/nla.c
akallabeth 460fef545d Refactored NLA 
* Simplified client/server state machine
* Encapsulated steps in functions
* Added proper debug logging so that state changes are easy to
  follow
2021-06-09 11:03:37 +02:00

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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>
#include <winpr/debug.h>
#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;
ULONG sendSeqNum;
ULONG recvSeqNum;
freerdp* instance;
CtxtHandle context;
LPTSTR SspiModule;
char* SamFile;
rdpSettings* settings;
rdpTransport* transport;
UINT32 cbMaxToken;
CHAR* packageName;
UINT32 version;
UINT32 peerVersion;
UINT32 errorCode;
ULONG fContextReq;
ULONG pfContextAttr;
BOOL haveContext;
BOOL haveInputBuffer;
BOOL havePubKeyAuth;
SECURITY_STATUS status;
CredHandle credentials;
TimeStamp expiration;
/* Lifetime of buffer nla_new -> nla_free */
SecBuffer ClientNonce; /* Depending on protocol version a random nonce or a value read from the
server. */
SecBuffer negoToken;
SecBuffer pubKeyAuth;
SecBuffer authInfo;
SecBuffer PublicKey;
SecBuffer tsCredentials;
LPTSTR ServicePrincipalName;
SEC_WINNT_AUTH_IDENTITY* identity;
PSecurityFunctionTable table;
SecPkgContext_Sizes ContextSizes;
};
static BOOL nla_send(rdpNla* nla);
static int nla_server_recv(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);
static BOOL nla_Digest_Update_From_SecBuffer(WINPR_DIGEST_CTX* ctx, const SecBuffer* buffer)
{
if (!buffer)
return FALSE;
return winpr_Digest_Update(ctx, buffer->pvBuffer, buffer->cbBuffer);
}
static BOOL nla_sec_buffer_alloc(SecBuffer* buffer, size_t size)
{
sspi_SecBufferFree(buffer);
if (!sspi_SecBufferAlloc(buffer, size))
return FALSE;
buffer->BufferType = SECBUFFER_TOKEN;
return TRUE;
}
static BOOL nla_sec_buffer_alloc_from_data(SecBuffer* buffer, const BYTE* data, size_t offset,
size_t size)
{
BYTE* pb;
if (!nla_sec_buffer_alloc(buffer, offset + size))
return FALSE;
pb = buffer->pvBuffer;
memcpy(&pb[offset], data, size);
return TRUE;
}
static BOOL nla_sec_buffer_alloc_from_buffer(SecBuffer* buffer, const SecBuffer* data,
size_t offset)
{
return nla_sec_buffer_alloc_from_data(buffer, data->pvBuffer, offset, data->cbBuffer);
}
static BOOL nla_decode_to_buffer(wStream* s, SecBuffer* buffer)
{
BOOL rc = FALSE;
size_t length;
if (!s || !buffer)
return FALSE;
if (!ber_read_octet_string_tag(s, &length) || /* OCTET STRING */
Stream_GetRemainingLength(s) < length)
return FALSE;
rc = nla_sec_buffer_alloc_from_data(buffer, Stream_Pointer(s), 0, length);
Stream_Seek(s, length);
return rc;
}
static BOOL nla_set_package_name(rdpNla* nla, const TCHAR* name)
{
if (!nla)
return FALSE;
free(nla->packageName);
nla->packageName = NULL;
if (name)
{
#if defined(UNICODE)
ConvertFromUnicode(CP_UTF8, 0, name, -1, &nla->packageName, 0, NULL, NULL);
#else
nla->packageName = _strdup(name);
#endif
if (!nla->packageName)
return FALSE;
}
return TRUE;
}
static SECURITY_STATUS nla_update_package_name(rdpNla* nla)
{
BOOL rc;
SECURITY_STATUS status;
PSecPkgInfo pPackageInfo;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return ERROR_INTERNAL_ERROR;
}
if (!nla->table->QuerySecurityPackageInfo || !nla->table->FreeContextBuffer)
{
WLog_ERR(TAG, "[%s] QuerySecurityPackageInfo=%p, FreeContextBuffer=%p", __FUNCTION__,
nla->table->QuerySecurityPackageInfo, nla->table->FreeContextBuffer);
return ERROR_INTERNAL_ERROR;
}
status = nla->table->QuerySecurityPackageInfo(NLA_PKG_NAME, &pPackageInfo);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "QuerySecurityPackageInfo status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return status;
}
nla->cbMaxToken = pPackageInfo->cbMaxToken;
rc = nla_set_package_name(nla, pPackageInfo->Name);
status = nla->table->FreeContextBuffer(pPackageInfo);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "FreeContextBuffer status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return status;
}
if (!rc)
return ERROR_WINS_INTERNAL;
return status;
}
static SECURITY_STATUS nla_query_context_sizes(rdpNla* nla)
{
SECURITY_STATUS status;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return SEC_E_INVALID_PARAMETER;
}
if (!nla->table->QueryContextAttributes)
{
WLog_ERR(TAG, "[%s] QueryContextAttributes=%p", __FUNCTION__,
nla->table->QuerySecurityPackageInfo);
return ERROR_INTERNAL_ERROR;
}
status =
nla->table->QueryContextAttributes(&nla->context, SECPKG_ATTR_SIZES, &nla->ContextSizes);
if (status != SEC_E_OK)
{
WLog_ERR(TAG, "QueryContextAttributes SECPKG_ATTR_SIZES failure %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
}
return status;
}
static SECURITY_STATUS nla_initialize_security_context(rdpNla* nla, BOOL initial,
SecBufferDesc* pInputBufferDesc,
SecBufferDesc* pOutputBufferDesc)
{
SECURITY_STATUS status;
PCtxtHandle ctx = NULL;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return SEC_E_INVALID_PARAMETER;
}
if (!nla->table->InitializeSecurityContext)
{
WLog_ERR(TAG, "[%s] InitializeSecurityContext=%p", __FUNCTION__,
nla->table->InitializeSecurityContext);
return ERROR_INTERNAL_ERROR;
}
if (!initial)
ctx = &nla->context;
status = nla->table->InitializeSecurityContext(
&nla->credentials, ctx, nla->ServicePrincipalName, nla->fContextReq, 0,
SECURITY_NATIVE_DREP, pInputBufferDesc, 0, &nla->context, pOutputBufferDesc,
&nla->pfContextAttr, &nla->expiration);
switch (status)
{
case SEC_E_INCOMPLETE_MESSAGE:
case SEC_E_OK:
case SEC_I_COMPLETE_AND_CONTINUE:
case SEC_I_COMPLETE_NEEDED:
case SEC_I_CONTINUE_NEEDED:
case SEC_I_INCOMPLETE_CREDENTIALS:
WLog_DBG(TAG, " InitializeSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
break;
default:
WLog_WARN(TAG, " InitializeSecurityContext failure status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
break;
}
return status;
}
static BOOL nla_complete_auth(rdpNla* nla, PSecBufferDesc pOutputBufferDesc)
{
SECURITY_STATUS status = SEC_E_INVALID_TOKEN;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return SEC_E_INVALID_PARAMETER;
}
if (!nla->table->CompleteAuthToken)
{
WLog_ERR(TAG, "[%s] CompleteAuthToken=%p", __FUNCTION__, nla->table->CompleteAuthToken);
return ERROR_INTERNAL_ERROR;
}
nla->status = nla->table->CompleteAuthToken(&nla->context, pOutputBufferDesc);
if (nla->status != SEC_E_OK)
{
WLog_WARN(TAG, "CompleteAuthToken status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(status), status);
return FALSE;
}
return TRUE;
}
static SECURITY_STATUS nla_decrypt(rdpNla* nla, SecBuffer* buffer, size_t headerLength)
{
ULONG pfQOP = 0;
SECURITY_STATUS status = SEC_E_INVALID_PARAMETER;
SecBuffer Buffers[2];
SecBufferDesc Message;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return SEC_E_INVALID_PARAMETER;
}
if (!nla->table->DecryptMessage)
{
WLog_ERR(TAG, "[%s] DecryptMessage=%p", __FUNCTION__, nla->table->DecryptMessage);
return ERROR_INTERNAL_ERROR;
}
if (!buffer || (headerLength > buffer->cbBuffer))
{
return SEC_E_INVALID_PARAMETER;
}
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = (ULONG)headerLength;
Buffers[0].pvBuffer = &((BYTE*)buffer->pvBuffer)[0];
Buffers[1].BufferType = SECBUFFER_DATA; /* Encrypted TLS Public Key */
Buffers[1].cbBuffer = (ULONG)(buffer->cbBuffer - headerLength);
Buffers[1].pvBuffer = &((BYTE*)buffer->pvBuffer)[headerLength];
Message.cBuffers = 2;
Message.ulVersion = SECBUFFER_VERSION;
Message.pBuffers = 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);
}
return status;
}
static SECURITY_STATUS nla_encrypt(rdpNla* nla, SecBuffer* buffer, size_t headerLength)
{
SECURITY_STATUS status = SEC_E_INVALID_PARAMETER;
SecBuffer Buffers[2];
SecBufferDesc Message;
if (!nla || !nla->table)
{
WLog_ERR(TAG, "[%s] nla->table=%p->%p", __FUNCTION__, nla, nla ? nla->table : NULL);
return SEC_E_INVALID_PARAMETER;
}
if (!nla->table->EncryptMessage)
{
WLog_ERR(TAG, "[%s] EncryptMessage=%p", __FUNCTION__, nla->table->EncryptMessage);
return ERROR_INTERNAL_ERROR;
}
if (!buffer || (headerLength > buffer->cbBuffer))
{
return SEC_E_INVALID_PARAMETER;
}
Message.cBuffers = 2;
Buffers[0].BufferType = SECBUFFER_TOKEN; /* Signature */
Buffers[0].cbBuffer = (ULONG)headerLength;
Buffers[0].pvBuffer = &((BYTE*)buffer->pvBuffer)[0];
Buffers[1].BufferType = SECBUFFER_DATA;
Buffers[1].cbBuffer = (ULONG)(buffer->cbBuffer - headerLength);
Buffers[1].pvBuffer = &((BYTE*)buffer->pvBuffer)[headerLength];
Message.pBuffers = 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);
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);
buffer->cbBuffer = Buffers[0].cbBuffer + Buffers[1].cbBuffer;
}
return status;
}
static size_t ber_sizeof_sequence_octet_string(size_t length)
{
size_t rc = ber_sizeof_contextual_tag(ber_sizeof_octet_string(length));
rc += ber_sizeof_octet_string(length);
return rc;
}
static size_t ber_write_sequence_octet_string(wStream* stream, BYTE context, const BYTE* value,
size_t length)
{
size_t rc = ber_write_contextual_tag(stream, context, ber_sizeof_octet_string(length), TRUE);
rc += ber_write_octet_string(stream, value, length);
return rc;
}
static size_t ber_write_sequence_octet_string_from_secbuffer(wStream* stream, BYTE context,
const SecBuffer* buffer)
{
return ber_write_sequence_octet_string(stream, context, buffer->pvBuffer, buffer->cbBuffer);
}
/* 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_set_state(nla, 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 ((settings->PasswordHash) && (strlen(settings->PasswordHash) > 0))
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 (!nla_sec_buffer_alloc_from_data(&nla->PublicKey, tls->PublicKey, 0, tls->PublicKeyLength))
{
WLog_ERR(TAG, "Failed to allocate sspi secBuffer");
return -1;
}
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);
nla->status = nla_update_package_name(nla);
if (nla->status != SEC_E_OK)
return -1;
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->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;
}
static BOOL nla_client_send_token(rdpNla* nla, SecBufferDesc* token)
{
BOOL rc = FALSE;
SecBuffer* buffer;
if (!nla || !token)
{
WLog_ERR(TAG, "[%s] nla=%p, token=%p", __FUNCTION__, nla, token);
goto fail;
}
if (token->cBuffers != 1)
{
WLog_ERR(TAG, "[%s] token->cBuffers=%" PRIu32, __FUNCTION__, token->cBuffers);
goto fail;
}
buffer = token->pBuffers;
if (buffer->cbBuffer < 1)
{
WLog_ERR(TAG, "[%s] token->pBuffers[0].cbBuffer=%" PRIu32, __FUNCTION__, buffer->cbBuffer);
goto fail;
}
if (!nla_sec_buffer_alloc_from_buffer(&nla->negoToken, &token->pBuffers[0], 0))
goto fail;
if (!nla_send(nla))
goto fail;
rc = TRUE;
fail:
return rc;
}
int nla_client_begin(rdpNla* nla)
{
int rc = -1;
SecBuffer outputBuffer = { 0 };
SecBufferDesc outputBufferDesc = { 0 };
if (nla_client_init(nla) < 1)
goto fail;
if (nla_get_state(nla) != NLA_STATE_INITIAL)
goto fail;
outputBufferDesc.ulVersion = SECBUFFER_VERSION;
outputBufferDesc.cBuffers = 1;
outputBufferDesc.pBuffers = &outputBuffer;
if (!nla_sec_buffer_alloc(&outputBuffer, nla->cbMaxToken))
goto fail;
nla->status = nla_initialize_security_context(nla, TRUE, NULL, &outputBufferDesc);
switch (nla->status)
{
case SEC_E_OK: /* Complete, send output token if >0 */
if (!nla_client_send_token(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_FINAL);
break;
case SEC_I_COMPLETE_AND_CONTINUE: /* CompleteAuthToken -> server ->
InitializeSecurityContext again */
if (!nla_complete_auth(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_NEGO_TOKEN);
break;
case SEC_I_COMPLETE_NEEDED: /* CompleteAuthToken -> finish */
if (!nla_complete_auth(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_FINAL);
break;
case SEC_I_CONTINUE_NEEDED: /* out token -> server -> InitializeSecurityContext again */
if (!nla_client_send_token(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_NEGO_TOKEN);
break;
case SEC_I_INCOMPLETE_CREDENTIALS:
case SEC_E_INCOMPLETE_MESSAGE:
default:
break;
}
rc = 1;
fail:
sspi_SecBufferFree(&outputBuffer);
return rc;
}
static int nla_client_recv_nego_token(rdpNla* nla)
{
int rc = -1;
SECURITY_STATUS status;
SecBuffer inputBuffer = { 0 };
SecBuffer outputBuffer = { 0 };
SecBufferDesc inputBufferDesc = { 0 };
SecBufferDesc outputBufferDesc = { 0 };
inputBufferDesc.ulVersion = SECBUFFER_VERSION;
inputBufferDesc.cBuffers = 1;
inputBufferDesc.pBuffers = &inputBuffer;
if (!nla_sec_buffer_alloc_from_buffer(&inputBuffer, &nla->negoToken, 0))
goto fail;
outputBufferDesc.ulVersion = SECBUFFER_VERSION;
outputBufferDesc.cBuffers = 1;
outputBufferDesc.pBuffers = &outputBuffer;
if (!nla_sec_buffer_alloc(&outputBuffer, nla->cbMaxToken))
goto fail;
nla->status = nla_initialize_security_context(nla, FALSE, &inputBufferDesc, &outputBufferDesc);
switch (nla->status)
{
case SEC_I_COMPLETE_AND_CONTINUE:
if (!nla_complete_auth(nla, &outputBufferDesc))
goto fail;
if (!nla_client_send_token(nla, &outputBufferDesc))
goto fail;
break;
case SEC_I_COMPLETE_NEEDED: /* CompleteAuthToken -> finish */
if (!nla_complete_auth(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_NEGO_TOKEN);
break;
case SEC_E_OK: /* completed */
nla->havePubKeyAuth = TRUE;
status = nla_query_context_sizes(nla);
if (status != SEC_E_OK)
goto fail;
if (nla->peerVersion < 5)
status = nla_encrypt_public_key_echo(nla);
else
status = nla_encrypt_public_key_hash(nla);
if (status != SEC_E_OK)
goto fail;
if (!nla_client_send_token(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_PUB_KEY_AUTH);
break;
case SEC_I_CONTINUE_NEEDED: /* send -> retry */
if (!nla_client_send_token(nla, &outputBufferDesc))
goto fail;
nla_set_state(nla, NLA_STATE_NEGO_TOKEN);
break;
default:
WLog_ERR(TAG, "Unexpected NLA return %s", GetSecurityStatusString(nla->status));
goto fail;
}
rc = 1;
fail:
sspi_SecBufferFree(&inputBuffer);
sspi_SecBufferFree(&outputBuffer);
return rc;
}
static int nla_client_recv_pub_key_auth(rdpNla* nla)
{
/* 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)
return -1;
if (!nla_send(nla))
{
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);
}
if (nla->status != SEC_E_OK)
return -1;
nla_set_state(nla, NLA_STATE_AUTH_INFO);
return 1;
}
static int nla_client_recv(rdpNla* nla)
{
switch (nla_get_state(nla))
{
case NLA_STATE_NEGO_TOKEN:
return nla_client_recv_nego_token(nla);
case NLA_STATE_PUB_KEY_AUTH:
return nla_client_recv_pub_key_auth(nla);
case NLA_STATE_FINAL:
default:
WLog_ERR(TAG, "NLA in invalid client receive state %s",
nla_get_state_str(nla_get_state(nla)));
return -1;
}
}
static int nla_client_authenticate(rdpNla* nla)
{
int rc = -1;
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)
goto fail;
while (nla_get_state(nla) < 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");
goto fail;
}
status = nla_recv_pdu(nla, s);
if (status < 0)
goto fail;
}
rc = 1;
fail:
Stream_Free(s, TRUE);
return rc;
}
/**
* Initialize NTLMSSP authentication module (server).
* @param credssp
*/
static int nla_server_init(rdpNla* nla)
{
rdpTls* tls = nla->transport->tls;
if (!nla_sec_buffer_alloc_from_data(&nla->PublicKey, tls->PublicKey, 0, tls->PublicKeyLength))
{
WLog_ERR(TAG, "Failed to allocate SecBuffer for public key");
return -1;
}
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_update_package_name(nla);
if (nla->status != SEC_E_OK)
return -1;
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->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;
nla_set_state(nla, NLA_STATE_INITIAL);
return 1;
}
static wStream* nla_server_recv_stream(rdpNla* nla)
{
wStream* s = NULL;
int status = -1;
s = Stream_New(NULL, 4096);
if (!s)
goto fail;
status = transport_read_pdu(nla->transport, s);
fail:
if (status < 0)
{
WLog_ERR(TAG, "nla_recv() error: %d", status);
Stream_Free(s, TRUE);
goto fail;
}
return s;
}
/**
* Authenticate with client using CredSSP (server).
* @param credssp
* @return 1 if authentication is successful
*/
static int nla_server_authenticate(rdpNla* nla)
{
int res = -1;
if (nla_server_init(nla) < 1)
goto fail;
/* Client is starting, here es the state machine:
*
* -- NLA_STATE_INITIAL --> NLA_STATE_INITIAL
* ----->> sending...
* ----->> protocol version 6
* ----->> nego token
* ----->> client nonce
* <<----- receiving...
* <<----- protocol version 6
* <<----- nego token
* ----->> sending...
* ----->> protocol version 6
* ----->> nego token
* ----->> public key auth
* ----->> client nonce
* -- NLA_STATE_NEGO_TOKEN --> NLA_STATE_PUB_KEY_AUTH
* <<----- receiving...
* <<----- protocol version 6
* <<----- public key info
* ----->> sending...
* ----->> protocol version 6
* ----->> auth info
* ----->> client nonce
* -- NLA_STATE_PUB_KEY_AUTH --> NLA_STATE
*/
while (TRUE)
{
int rc = -1;
SecBuffer inputBuffer = { 0 };
SecBuffer outputBuffer = { 0 };
SecBufferDesc inputBufferDesc = { 0 };
SecBufferDesc outputBufferDesc = { 0 };
/* receive authentication token */
inputBufferDesc.ulVersion = SECBUFFER_VERSION;
inputBufferDesc.cBuffers = 1;
inputBufferDesc.pBuffers = &inputBuffer;
if (nla_server_recv(nla) < 0)
goto fail;
WLog_DBG(TAG, "Receiving Authentication Token");
if (!nla_sec_buffer_alloc_from_buffer(&inputBuffer, &nla->negoToken, 0))
{
WLog_ERR(TAG, "CredSSP: invalid negoToken!");
goto fail;
}
outputBufferDesc.ulVersion = SECBUFFER_VERSION;
outputBufferDesc.cBuffers = 1;
outputBufferDesc.pBuffers = &outputBuffer;
if (!nla_sec_buffer_alloc(&outputBuffer, nla->cbMaxToken))
goto fail;
nla->status = nla->table->AcceptSecurityContext(
&nla->credentials, nla->haveContext ? &nla->context : NULL, &inputBufferDesc,
nla->fContextReq, SECURITY_NATIVE_DREP, &nla->context, &outputBufferDesc,
&nla->pfContextAttr, &nla->expiration);
WLog_VRB(TAG, "AcceptSecurityContext status %s [0x%08" PRIX32 "]",
GetSecurityStatusString(nla->status), nla->status);
if (!nla_sec_buffer_alloc_from_buffer(&nla->negoToken, &outputBuffer, 0))
goto fail;
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_complete_auth(nla, &outputBufferDesc))
goto fail;
}
if (nla->status == SEC_E_OK)
{
if (outputBuffer.cbBuffer != 0)
{
if (!nla_send(nla))
{
nla_buffer_free(nla);
goto fail;
}
if (nla_server_recv(nla) < 0)
goto fail;
WLog_DBG(TAG, "Receiving pubkey Token");
}
nla->havePubKeyAuth = TRUE;
nla->status = nla_query_context_sizes(nla);
if (nla->status != SEC_E_OK)
goto fail;
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);
goto fail;
}
sspi_SecBufferFree(&nla->negoToken);
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)
goto fail;
rc = 1;
fail:
sspi_SecBufferFree(&inputBuffer);
sspi_SecBufferFree(&outputBuffer);
if (rc < 0)
{
res = rc;
goto fail_auth;
}
}
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);
goto fail_auth; /* Access Denied */
}
/* send authentication token */
WLog_DBG(TAG, "Sending Authentication Token");
if (!nla_send(nla))
{
nla_buffer_free(nla);
goto fail_auth;
}
if (nla->status != SEC_I_CONTINUE_NEEDED)
break;
nla->haveContext = TRUE;
}
/* Receive encrypted credentials */
if (nla_server_recv(nla) < 0)
goto fail_auth;
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);
goto fail_auth;
}
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);
goto fail_auth;
}
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);
goto fail_auth;
}
}
res = 1;
fail_auth:
nla_buffer_free(nla);
return res;
}
/**
* 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, size_t size)
{
size_t 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, size_t size)
{
size_t 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)
{
SECURITY_STATUS status;
if (!nla_sec_buffer_alloc_from_buffer(&nla->pubKeyAuth, &nla->PublicKey,
nla->ContextSizes.cbSecurityTrailer))
return SEC_E_INSUFFICIENT_MEMORY;
if (!nla->server)
{
BYTE* data = &((BYTE*)nla->PublicKey.pvBuffer)[nla->ContextSizes.cbSecurityTrailer];
/* server echos the public key +1 */
ap_integer_increment_le(data, nla->PublicKey.cbBuffer);
}
status = nla_encrypt(nla, &nla->pubKeyAuth, nla->ContextSizes.cbSecurityTrailer);
if (status != SEC_E_OK)
return status;
return status;
}
SECURITY_STATUS nla_encrypt_public_key_hash(rdpNla* nla)
{
SECURITY_STATUS status = SEC_E_INTERNAL_ERROR;
WINPR_DIGEST_CTX* sha256 = NULL;
BYTE* hash;
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);
if (!nla_sec_buffer_alloc(&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 (!nla_Digest_Update_From_SecBuffer(sha256, &nla->ClientNonce))
goto out;
/* SubjectPublicKey */
if (!nla_Digest_Update_From_SecBuffer(sha256, &nla->PublicKey))
goto out;
hash = &((BYTE*)nla->pubKeyAuth.pvBuffer)[nla->ContextSizes.cbSecurityTrailer];
if (!winpr_Digest_Final(sha256, hash, WINPR_SHA256_DIGEST_LENGTH))
goto out;
status = nla_encrypt(nla, &nla->pubKeyAuth, nla->ContextSizes.cbSecurityTrailer);
if (status != SEC_E_OK)
goto out;
out:
winpr_Digest_Free(sha256);
return status;
}
SECURITY_STATUS nla_decrypt_public_key_echo(rdpNla* nla)
{
BYTE* public_key1 = NULL;
BYTE* public_key2 = NULL;
ULONG public_key_length = 0;
size_t signature_length;
SECURITY_STATUS status = SEC_E_INVALID_TOKEN;
PSecBuffer pubKeyAuth;
if (!nla)
goto fail;
pubKeyAuth = &nla->pubKeyAuth;
signature_length = pubKeyAuth->cbBuffer - nla->PublicKey.cbBuffer;
if ((pubKeyAuth->cbBuffer < nla->PublicKey.cbBuffer) ||
(signature_length > nla->ContextSizes.cbSecurityTrailer))
{
WLog_ERR(TAG, "unexpected pubKeyAuth buffer size: %" PRIu32 "", pubKeyAuth->cbBuffer);
goto fail;
}
status = nla_decrypt(nla, pubKeyAuth, signature_length);
if (status != SEC_E_OK)
goto fail;
public_key1 = &((BYTE*)nla->PublicKey.pvBuffer)[0];
public_key2 = &((BYTE*)pubKeyAuth->pvBuffer)[pubKeyAuth->cbBuffer];
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:
return status;
}
SECURITY_STATUS nla_decrypt_public_key_hash(rdpNla* nla)
{
size_t signature_length;
WINPR_DIGEST_CTX* sha256 = NULL;
BYTE serverClientHash[WINPR_SHA256_DIGEST_LENGTH];
SECURITY_STATUS status = SEC_E_INVALID_TOKEN;
const BYTE* hashMagic = nla->server ? ClientServerHashMagic : ServerClientHashMagic;
const BYTE* decryptedHash;
const size_t hashSize =
nla->server ? sizeof(ClientServerHashMagic) : sizeof(ServerClientHashMagic);
PSecBuffer pubKeyAuth = &nla->pubKeyAuth;
signature_length = pubKeyAuth->cbBuffer - WINPR_SHA256_DIGEST_LENGTH;
if ((pubKeyAuth->cbBuffer < WINPR_SHA256_DIGEST_LENGTH) ||
(signature_length > nla->ContextSizes.cbSecurityTrailer))
{
WLog_ERR(TAG, "unexpected pubKeyAuth buffer size: %" PRIu32 "", pubKeyAuth->cbBuffer);
goto fail;
}
status = nla_decrypt(nla, pubKeyAuth, signature_length);
if (status != SEC_E_OK)
goto fail;
status = SEC_E_INTERNAL_ERROR;
decryptedHash = &((const BYTE*)pubKeyAuth->pvBuffer)[signature_length];
/* 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 (!nla_Digest_Update_From_SecBuffer(sha256, &nla->ClientNonce))
goto fail;
/* SubjectPublicKey */
if (!nla_Digest_Update_From_SecBuffer(sha256, &nla->PublicKey))
goto fail;
if (!winpr_Digest_Final(sha256, serverClientHash, sizeof(serverClientHash)))
goto fail;
/* verify hash */
if (memcmp(serverClientHash, decryptedHash, 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:
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, SecBuffer* data, size_t offset)
{
wStream* s;
size_t length;
size_t ts_password_creds_length = 0;
BOOL ret = FALSE;
if (!data)
return FALSE;
s = Stream_New(data->pvBuffer, data->cbBuffer);
if (!s)
{
WLog_ERR(TAG, "Stream_New failed!");
return FALSE;
}
if (!Stream_SafeSeek(s, offset))
goto fail;
/* 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);
fail:
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;
UINT32 DomainLength = 0;
UINT32 UserLength = 0;
UINT32 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 (!nla_sec_buffer_alloc(&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)
{
SECURITY_STATUS status;
if (!nla_encode_ts_credentials(nla))
return SEC_E_INSUFFICIENT_MEMORY;
if (!nla_sec_buffer_alloc_from_buffer(&nla->authInfo, &nla->tsCredentials,
nla->ContextSizes.cbSecurityTrailer))
return SEC_E_INSUFFICIENT_MEMORY;
status = nla_encrypt(nla, &nla->authInfo, nla->ContextSizes.cbSecurityTrailer);
if (status != SEC_E_OK)
return status;
return SEC_E_OK;
}
static SECURITY_STATUS nla_decrypt_ts_credentials(rdpNla* nla)
{
SECURITY_STATUS status;
if (nla->authInfo.cbBuffer < 1)
{
WLog_ERR(TAG, "nla_decrypt_ts_credentials missing authInfo buffer");
return SEC_E_INVALID_TOKEN;
}
status = nla_decrypt(nla, &nla->authInfo, nla->ContextSizes.cbSecurityTrailer);
if (status != SEC_E_OK)
return status;
if (!nla_read_ts_credentials(nla, &nla->authInfo, nla->ContextSizes.cbSecurityTrailer))
return SEC_E_INSUFFICIENT_MEMORY;
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(const SecBuffer* buffer)
{
size_t length = buffer->cbBuffer;
if (length == 0)
return 0;
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(const SecBuffer* buffer)
{
size_t length = buffer->cbBuffer;
if (length == 0)
return 0;
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_auth_info(const SecBuffer* buffer)
{
size_t length = buffer->cbBuffer;
if (length == 0)
return 0;
length = ber_sizeof_octet_string(length);
length += ber_sizeof_contextual_tag(length);
return length;
}
static size_t nla_sizeof_client_nonce(const SecBuffer* buffer)
{
size_t length = buffer->cbBuffer;
if (length == 0)
return 0;
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;
}
static BOOL nla_client_write_nego_token(wStream* s, const SecBuffer* negoToken)
{
const size_t nego_tokens_length = nla_sizeof_nego_tokens(negoToken);
if (Stream_GetRemainingCapacity(s) < nego_tokens_length)
return FALSE;
if (nego_tokens_length > 0)
{
size_t length;
WLog_DBG(TAG, " ----->> nego token");
length =
ber_write_contextual_tag(s, 1,
ber_sizeof_sequence(ber_sizeof_sequence(
ber_sizeof_sequence_octet_string(negoToken->cbBuffer))),
TRUE); /* NegoData */
length +=
ber_write_sequence_tag(s, ber_sizeof_sequence(ber_sizeof_sequence_octet_string(
negoToken->cbBuffer))); /* SEQUENCE OF NegoDataItem */
length += ber_write_sequence_tag(
s, ber_sizeof_sequence_octet_string(negoToken->cbBuffer)); /* NegoDataItem */
length +=
ber_write_sequence_octet_string_from_secbuffer(s, 0, negoToken); /* OCTET STRING */
if (length != nego_tokens_length)
return FALSE;
}
return TRUE;
}
/**
* Send CredSSP message.
* @param credssp
*/
BOOL nla_send(rdpNla* nla)
{
BOOL rc = FALSE;
wStream* s;
size_t length;
size_t ts_request_length;
size_t error_code_context_length = 0;
size_t error_code_length = 0;
const size_t nego_tokens_length = nla_sizeof_nego_tokens(&nla->negoToken);
const size_t pub_key_auth_length = nla_sizeof_pub_key_auth(&nla->pubKeyAuth);
const size_t auth_info_length = nla_sizeof_auth_info(&nla->authInfo);
const size_t client_nonce_length = nla_sizeof_client_nonce(&nla->ClientNonce);
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;
}
WLog_DBG(TAG, "----->> sending...");
/* TSRequest */
ber_write_sequence_tag(s, ts_request_length); /* SEQUENCE */
/* [0] version */
ber_write_contextual_tag(s, 0, 3, TRUE);
WLog_DBG(TAG, " ----->> protocol version %" PRIu32, nla->version);
ber_write_integer(s, nla->version); /* INTEGER */
/* [1] negoTokens (NegoData) */
if (!nla_client_write_nego_token(s, &nla->negoToken))
goto fail;
/* [2] authInfo (OCTET STRING) */
if (auth_info_length > 0)
{
WLog_DBG(TAG, " ----->> auth info");
if (ber_write_sequence_octet_string_from_secbuffer(s, 2, &nla->authInfo) !=
auth_info_length)
goto fail;
}
/* [3] pubKeyAuth (OCTET STRING) */
if (pub_key_auth_length > 0)
{
WLog_DBG(TAG, " ----->> public key auth");
if (ber_write_sequence_octet_string_from_secbuffer(s, 3, &nla->pubKeyAuth) !=
pub_key_auth_length)
goto fail;
}
/* [4] errorCode (INTEGER) */
if (error_code_length > 0)
{
char buffer[1024];
WLog_DBG(TAG, " ----->> error code %s 0x%08" PRIx32,
winpr_strerror(nla->errorCode, buffer, sizeof(buffer)), nla->errorCode);
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)
{
WLog_DBG(TAG, " ----->> client nonce");
if (ber_write_sequence_octet_string_from_secbuffer(s, 5, &nla->ClientNonce) !=
client_nonce_length)
goto fail;
}
WLog_DBG(TAG, "[%" PRIuz " bytes]", Stream_GetPosition(s));
if (transport_write(nla->transport, s) < 0)
goto fail;
rc = TRUE;
fail:
Stream_Free(s, TRUE);
return rc;
}
static int nla_decode_ts_request(rdpNla* nla, wStream* s)
{
int rc = -1;
size_t length;
UINT32 version = 0;
WLog_DBG(TAG, "<<----- receiving...");
/* TSRequest */
if (!ber_read_sequence_tag(s, &length) || !ber_read_contextual_tag(s, 0, &length, TRUE) ||
!ber_read_integer(s, &version))
{
goto fail;
}
WLog_DBG(TAG, " <<----- protocol version %" PRIu32, version);
if (nla->peerVersion == 0)
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);
goto fail;
}
/* [1] negoTokens (NegoData) */
if (ber_read_contextual_tag(s, 1, &length, TRUE) != FALSE)
{
WLog_DBG(TAG, " <<----- nego token");
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))
{
goto fail;
}
if (!nla_decode_to_buffer(s, &nla->negoToken))
goto fail;
}
/* [2] authInfo (OCTET STRING) */
if (ber_read_contextual_tag(s, 2, &length, TRUE) != FALSE)
{
WLog_DBG(TAG, " <<----- auth info");
if (!nla_decode_to_buffer(s, &nla->authInfo))
goto fail;
}
/* [3] pubKeyAuth (OCTET STRING) */
if (ber_read_contextual_tag(s, 3, &length, TRUE) != FALSE)
{
WLog_DBG(TAG, " <<----- public key info");
if (!nla_decode_to_buffer(s, &nla->pubKeyAuth))
goto fail;
}
/* [4] errorCode (INTEGER) */
if (nla->peerVersion >= 3)
{
if (ber_read_contextual_tag(s, 4, &length, TRUE) != FALSE)
{
char buffer[1024];
if (!ber_read_integer(s, &nla->errorCode))
goto fail;
WLog_DBG(TAG, " <<----- error code %s 0x%08" PRIx32,
winpr_strerror(nla->errorCode, buffer, sizeof(buffer)), nla->errorCode);
}
if (nla->peerVersion >= 5)
{
if (ber_read_contextual_tag(s, 5, &length, TRUE) != FALSE)
{
WLog_DBG(TAG, " <<----- client nonce");
if (!nla_decode_to_buffer(s, &nla->ClientNonce))
goto fail;
}
}
}
rc = 1;
fail:
return rc;
}
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: 0x%08" PRIX32 "", nla->errorCode);
code = FREERDP_ERROR_AUTHENTICATION_FAILED;
break;
}
freerdp_set_last_error_log(nla->instance->context, code);
return -1;
}
return nla_client_recv(nla);
}
int nla_server_recv(rdpNla* nla)
{
int status;
wStream* s = nla_server_recv_stream(nla);
if (!s)
goto fail;
status = nla_decode_ts_request(nla, s);
fail:
Stream_Free(s, TRUE);
return status;
}
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 = ERROR_INTERNAL_ERROR;
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)
goto fail;
if (!ServiceClass)
{
ServicePrincipalName = (LPTSTR)_tcsdup(hostnameX);
status = ERROR_SUCCESS;
goto fail;
}
SpnLength = 0;
status = DsMakeSpn(ServiceClassX, hostnameX, NULL, 0, NULL, &SpnLength, NULL);
if (status != ERROR_BUFFER_OVERFLOW)
goto fail;
ServicePrincipalName = (LPTSTR)calloc(SpnLength, sizeof(TCHAR));
if (!ServicePrincipalName)
goto fail;
status = DsMakeSpn(ServiceClassX, hostnameX, NULL, 0, NULL, &SpnLength, ServicePrincipalName);
if (status != ERROR_SUCCESS)
goto fail;
fail:
if (status != ERROR_SUCCESS)
{
free(ServicePrincipalName);
ServicePrincipalName = 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 (!nla_sec_buffer_alloc(&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;
nla_buffer_free(nla);
sspi_SecBufferFree(&nla->ClientNonce);
sspi_SecBufferFree(&nla->PublicKey);
sspi_SecBufferFree(&nla->tsCredentials);
free(nla->ServicePrincipalName);
nla_identity_free(nla->identity);
nla_set_package_name(nla, NULL);
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;
WLog_DBG(TAG, "-- %s\t--> %s", nla_get_state_str(nla->state), nla_get_state_str(state));
nla->state = state;
return TRUE;
}
BOOL nla_set_service_principal(rdpNla* nla, LPTSTR 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);
}
const char* nla_get_state_str(NLA_STATE state)
{
switch (state)
{
case NLA_STATE_INITIAL:
return "NLA_STATE_INITIAL";
case NLA_STATE_NEGO_TOKEN:
return "NLA_STATE_NEGO_TOKEN";
case NLA_STATE_PUB_KEY_AUTH:
return "NLA_STATE_PUB_KEY_AUTH";
case NLA_STATE_AUTH_INFO:
return "NLA_STATE_AUTH_INFO";
case NLA_STATE_POST_NEGO:
return "NLA_STATE_POST_NEGO";
case NLA_STATE_FINAL:
return "NLA_STATE_FINAL";
default:
return "UNKNOWN";
}
}
DWORD nla_get_error(rdpNla* nla)
{
if (!nla)
return ERROR_INTERNAL_ERROR;
return nla->errorCode;
}
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