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FreeRDP/libfreerdp/core/nla.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>
* Copyright 2022 David Fort <contact@hardening-consulting.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.
*/
#include <freerdp/config.h>
#include <time.h>
#include <ctype.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/assert.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 <winpr/ncrypt.h>
#include <winpr/cred.h>
#include <winpr/debug.h>
#include <winpr/asn1.h>
#include "nla.h"
#include "utils.h"
#include <freerdp/utils/smartcardlogon.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;
rdpContext* rdpcontext;
CtxtHandle context;
LPSTR SspiModule;
char* SamFile;
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;
SEC_WINNT_AUTH_IDENTITY_WINPR identityWinPr;
SEC_WINPR_KERBEROS_SETTINGS* kerberosSettings;
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_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;
WINPR_ASSERT(buffer);
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;
WINPR_ASSERT(buffer);
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_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 FALSE;
}
if (!nla->table->CompleteAuthToken)
{
WLog_ERR(TAG, "[%s] CompleteAuthToken=%p", __FUNCTION__, nla->table->CompleteAuthToken);
return FALSE;
}
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;
}
/* 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;
static BOOL nla_adjust_settings_from_smartcard(rdpNla* nla)
{
SmartcardCerts* certs = NULL;
const SmartcardCertInfo* info = NULL;
DWORD count;
rdpSettings* settings;
SEC_WINPR_KERBEROS_SETTINGS* kerbSettings;
BOOL ret = FALSE;
WINPR_ASSERT(nla);
WINPR_ASSERT(nla->rdpcontext);
settings = nla->rdpcontext->settings;
WINPR_ASSERT(settings);
if (!settings->SmartcardLogon)
return TRUE;
kerbSettings = nla->kerberosSettings;
WINPR_ASSERT(kerbSettings);
if (!settings->CspName)
{
if (!freerdp_settings_set_string(settings, FreeRDP_CspName, MS_SCARD_PROV_A))
{
WLog_ERR(TAG, "unable to set CSP name");
return FALSE;
}
}
if (settings->PkinitAnchors)
{
kerbSettings->pkinitX509Anchors = _strdup(settings->PkinitAnchors);
if (!kerbSettings->pkinitX509Anchors)
{
WLog_ERR(TAG, "error setting X509 anchors");
return FALSE;
}
}
if (!smartcard_enumerateCerts(settings, &certs, &count))
{
WLog_ERR(TAG, "unable to list smartcard certificates");
return FALSE;
}
if (count < 1)
{
WLog_ERR(TAG, "no smartcard certificates found");
goto out;
}
if (count != 1)
goto setup_pin;
info = smartcard_getCertInfo(certs, 0);
if (!info)
goto out;
/*
* just one result let's try to fill missing parameters
*/
if (!settings->Username && info->userHint)
{
if (!freerdp_settings_set_string(settings, FreeRDP_Username, info->userHint))
{
WLog_ERR(TAG, "unable to copy certificate username");
goto out;
}
}
if (!settings->Domain && info->domainHint)
{
if (!freerdp_settings_set_string(settings, FreeRDP_Domain, info->domainHint))
{
WLog_ERR(TAG, "unable to copy certificate domain");
goto out;
}
}
if (!settings->ReaderName && info->reader)
{
if (ConvertFromUnicode(CP_UTF8, 0, info->reader, -1, &settings->ReaderName, 0, NULL, NULL) <
0)
{
WLog_ERR(TAG, "unable to copy reader name");
goto out;
}
}
if (!settings->ContainerName && info->containerName)
{
if (!freerdp_settings_set_string(settings, FreeRDP_ContainerName, info->containerName))
{
WLog_ERR(TAG, "unable to copy container name");
goto out;
}
}
memcpy(kerbSettings->certSha1, info->sha1Hash, sizeof(kerbSettings->certSha1));
if (info->pkinitArgs)
{
kerbSettings->pkinitX509Identity = _strdup(info->pkinitArgs);
if (!kerbSettings->pkinitX509Identity)
{
WLog_ERR(TAG, "unable to copy pkinitArgs");
goto out;
}
}
setup_pin:
ret = TRUE;
out:
smartcardCerts_Free(certs);
return ret;
}
static BOOL nla_client_setup_identity(rdpNla* nla)
{
WINPR_SAM* sam;
WINPR_SAM_ENTRY* entry;
BOOL PromptPassword = FALSE;
rdpSettings* settings;
freerdp* instance;
WINPR_ASSERT(nla);
WINPR_ASSERT(nla->rdpcontext);
settings = nla->rdpcontext->settings;
WINPR_ASSERT(settings);
instance = nla->rdpcontext->instance;
WINPR_ASSERT(instance);
/* */
if ((utils_str_is_empty(settings->Username) ||
(utils_str_is_empty(settings->Password) &&
utils_str_is_empty((const char*)settings->RedirectionPassword))))
{
PromptPassword = TRUE;
}
if (PromptPassword && !utils_str_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)
{
switch (utils_authenticate(instance, AUTH_NLA, TRUE))
{
case AUTH_SKIP:
case AUTH_SUCCESS:
break;
case AUTH_NO_CREDENTIALS:
freerdp_set_last_error_log(instance->context,
FREERDP_ERROR_CONNECT_NO_OR_MISSING_CREDENTIALS);
return 0;
default:
return 0;
}
}
if (!settings->Username)
{
sspi_FreeAuthIdentity(nla->identity);
nla->identity = NULL;
}
else if (settings->SmartcardLogon)
{
#ifdef _WIN32
{
CERT_CREDENTIAL_INFO certInfo = { sizeof(CERT_CREDENTIAL_INFO), { 0 } };
LPSTR marshalledCredentials;
memcpy(certInfo.rgbHashOfCert, nla->kerberosSettings->certSha1,
sizeof(certInfo.rgbHashOfCert));
if (!CredMarshalCredentialA(CertCredential, &certInfo, &marshalledCredentials))
{
WLog_ERR(TAG, "error marshalling cert credentials");
return FALSE;
}
if (sspi_SetAuthIdentityA(nla->identity, marshalledCredentials, NULL,
settings->Password) < 0)
return -1;
CredFree(marshalledCredentials);
}
#else
if (sspi_SetAuthIdentityA(nla->identity, settings->Username, settings->Domain,
settings->Password) < 0)
return -1;
#endif /* _WIN32 */
return TRUE;
}
else
{
BOOL usePassword = TRUE;
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;
}
if (settings->RestrictedAdminModeRequired)
{
if (settings->PasswordHash && strlen(settings->PasswordHash) == 32)
{
if (sspi_SetAuthIdentityA(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_SetAuthIdentityA(nla->identity, settings->Username, settings->Domain,
settings->Password) < 0)
return -1;
}
}
return TRUE;
}
static const char* parseInt(const char* v, INT32* r)
{
*r = 0;
/* check that we have at least a digit */
if (!*v || !((*v >= '0') && (*v <= '9')))
return NULL;
for (; *v && (*v >= '0') && (*v <= '9'); v++)
{
*r = (*r * 10) + (*v - '0');
}
return v;
}
static BOOL parseKerberosDeltat(const char* value, INT32* dest, const char* message)
{
INT32 v;
const char* ptr;
WINPR_ASSERT(value);
WINPR_ASSERT(dest);
WINPR_ASSERT(message);
/* determine the format :
* h:m[:s] (3:00:02) deltat in hours/minutes
* <n>d<n>h<n>m<n>s 1d4h deltat in day/hours/minutes/seconds
* <n> deltat in seconds
*/
ptr = strchr(value, ':');
if (ptr)
{
/* format like h:m[:s] */
*dest = 0;
value = parseInt(value, &v);
if (!value || *value != ':')
{
WLog_ERR(TAG, "Invalid value for %s", message);
return FALSE;
}
*dest = v * 3600;
value = parseInt(value + 1, &v);
if (!value || (*value != 0 && *value != ':') || (v > 60))
{
WLog_ERR(TAG, "Invalid value for %s", message);
return FALSE;
}
*dest += v * 60;
if (*value == ':')
{
/* have optional seconds */
value = parseInt(value + 1, &v);
if (!value || (*value != 0) || (v > 60))
{
WLog_ERR(TAG, "Invalid value for %s", message);
return FALSE;
}
*dest += v;
}
return TRUE;
}
/* <n> or <n>d<n>h<n>m<n>s format */
value = parseInt(value, &v);
if (!value)
{
WLog_ERR(TAG, "Invalid value for %s", message);
return FALSE;
}
if (!*value || isspace(*value))
{
/* interpret that as a value in seconds */
*dest = v;
return TRUE;
}
*dest = 0;
do
{
INT32 factor = 0;
INT32 maxValue = 0;
switch (*value)
{
case 'd':
factor = 3600 * 24;
maxValue = 0;
break;
case 'h':
factor = 3600;
maxValue = 0;
break;
case 'm':
factor = 60;
maxValue = 60;
break;
case 's':
factor = 1;
maxValue = 60;
break;
default:
WLog_ERR(TAG, "invalid value for unit %c when parsing %s", *value, message);
return FALSE;
}
if ((maxValue > 0) && (v > maxValue))
{
WLog_ERR(TAG, "invalid value for unit %c when parsing %s", *value, message);
return FALSE;
}
*dest += (v * factor);
value++;
if (!*value)
return TRUE;
value = parseInt(value, &v);
if (!value || !*value)
{
WLog_ERR(TAG, "Invalid value for %s", message);
return FALSE;
}
} while (TRUE);
return TRUE;
}
static BOOL nla_setup_kerberos(rdpNla* nla)
{
SEC_WINPR_KERBEROS_SETTINGS* kerbSettings;
rdpSettings* settings;
WINPR_ASSERT(nla);
WINPR_ASSERT(nla->rdpcontext);
settings = nla->rdpcontext->settings;
WINPR_ASSERT(settings);
kerbSettings = nla->kerberosSettings;
WINPR_ASSERT(kerbSettings);
if (settings->KerberosKdcUrl)
{
kerbSettings->kdcUrl = _strdup(settings->KerberosKdcUrl);
if (!kerbSettings->kdcUrl)
{
WLog_ERR(TAG, "unable to copy kdcUrl");
return FALSE;
}
}
if (settings->KerberosLifeTime &&
!parseKerberosDeltat(settings->KerberosLifeTime, &kerbSettings->lifeTime, "lifetime"))
return FALSE;
if (settings->KerberosStartTime &&
!parseKerberosDeltat(settings->KerberosStartTime, &kerbSettings->startTime, "starttime"))
return FALSE;
if (settings->KerberosRenewableLifeTime &&
!parseKerberosDeltat(settings->KerberosRenewableLifeTime, &kerbSettings->renewLifeTime,
"renewLifetime"))
return FALSE;
if (settings->KerberosCache)
{
kerbSettings->cache = _strdup(settings->KerberosCache);
if (!kerbSettings->cache)
{
WLog_ERR(TAG, "unable to copy cache name");
return FALSE;
}
}
if (settings->KerberosKeytab)
{
kerbSettings->keytab = _strdup(settings->KerberosKeytab);
if (!kerbSettings->keytab)
{
WLog_ERR(TAG, "unable to copy keytab name");
return FALSE;
}
}
if (settings->KerberosArmor)
{
kerbSettings->armorCache = _strdup(settings->KerberosArmor);
if (!kerbSettings->armorCache)
{
WLog_ERR(TAG, "unable to copy armorCache");
return FALSE;
}
}
return TRUE;
}
/**
* Initialize SSPI credential attributes
* @param nla
*/
static BOOL nla_client_init_cred_handle(rdpNla* nla)
{
SECURITY_STATUS secStatus;
SEC_WINPR_KERBEROS_SETTINGS* kerbSettings;
WINPR_ASSERT(nla);
kerbSettings = nla->kerberosSettings;
WINPR_ASSERT(kerbSettings);
WINPR_ASSERT(nla->table->SetCredentialsAttributes);
if (kerbSettings->kdcUrl)
{
#ifdef UNICODE
SecPkgCredentials_KdcUrlW secAttr = { NULL };
ConvertToUnicode(CP_UTF8, 0, kerbSettings->kdcUrl, -1, &secAttr.KdcUrl, 0);
if (!secAttr.KdcUrl)
return FALSE;
secStatus = nla->table->SetCredentialsAttributesW(
&nla->credentials, SECPKG_CRED_ATTR_KDC_URL, (void*)&secAttr, sizeof(secAttr));
free(secAttr.KdcUrl);
#else
SecPkgCredentials_KdcUrlA secAttr = { NULL };
secAttr.KdcUrl = kerbSettings->kdcUrl;
secStatus = nla->table->SetCredentialsAttributesA(
&nla->credentials, SECPKG_CRED_ATTR_KDC_URL, (void*)&secAttr, sizeof(secAttr));
#endif
if (secStatus != SEC_E_OK)
{
WLog_WARN(TAG, "Explicit Kerberos KDC URL (%s) injection is not supported",
kerbSettings->kdcUrl);
}
}
return TRUE;
}
/**
* Initialize NTLM/Kerberos SSP authentication module (client).
* @param credssp
*/
static int nla_client_init(rdpNla* nla)
{
char* spn;
size_t length;
rdpTls* tls = NULL;
rdpSettings* settings;
WINPR_ASSERT(nla);
WINPR_ASSERT(nla->rdpcontext);
settings = nla->rdpcontext->settings;
WINPR_ASSERT(settings);
nla_set_state(nla, NLA_STATE_INITIAL);
if (settings->RestrictedAdminModeRequired)
settings->DisableCredentialsDelegation = TRUE;
if (!nla_setup_kerberos(nla))
return -1;
if (!nla_adjust_settings_from_smartcard(nla))
return -1;
if (!nla_client_setup_identity(nla))
return -1;
tls = transport_get_tls(nla->transport);
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
if (!nla_sspi_module_init(nla))
return -1;
nla->status = nla_update_package_name(nla);
if (nla->status != SEC_E_OK)
return -1;
WLog_DBG(TAG, "%s %" PRIu32 " : packageName=%s ; cbMaxToken=%" PRIu32, __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;
}
if (!nla_client_init_cred_handle(nla))
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;
return 1;
}
static BOOL nla_client_send_token(rdpNla* nla, SecBufferDesc* token)
{
BOOL rc = FALSE;
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;
}
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 };
WINPR_ASSERT(nla);
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_E_NO_CREDENTIALS:
case SEC_I_INCOMPLETE_CREDENTIALS:
case SEC_E_INCOMPLETE_MESSAGE:
default:
goto fail;
}
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 };
WINPR_ASSERT(nla);
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)
{
WINPR_ASSERT(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)
{
WINPR_ASSERT(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;
WINPR_ASSERT(nla);
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;
freerdp_peer* peer;
SEC_WINNT_AUTH_IDENTITY_WINPR* identity;
WINPR_ASSERT(nla);
tls = transport_get_tls(nla->transport);
WINPR_ASSERT(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_sspi_module_init(nla))
return -1;
if (!nla_setup_kerberos(nla))
return -1;
WINPR_ASSERT(nla->rdpcontext);
WINPR_ASSERT(nla->rdpcontext->peer);
peer = nla->rdpcontext->peer;
WINPR_ASSERT(peer);
identity = &nla->identityWinPr;
identity->ntlmSettings.hashCallback = peer->SspiNtlmHashCallback;
identity->ntlmSettings.hashCallbackArg = peer;
identity->ntlmSettings.samFile = nla->SamFile;
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, 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: 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;
WINPR_ASSERT(nla);
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);
return NULL;
}
return s;
}
static BOOL nla_server_recv_credentials(rdpNla* nla)
{
BOOL rc = FALSE;
WINPR_ASSERT(nla);
if (nla_server_recv(nla) < 0)
goto fail;
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;
}
WINPR_ASSERT(nla->table);
WINPR_ASSERT(nla->table->ImpersonateSecurityContext);
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;
}
else
{
WINPR_ASSERT(nla->table->RevertSecurityContext);
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;
}
}
rc = TRUE;
fail:
return rc;
}
/**
* Authenticate with client using CredSSP (server).
* @param credssp
* @return 1 if authentication is successful
*/
static int nla_server_authenticate(rdpNla* nla)
{
int res = -1;
WINPR_ASSERT(nla);
if (nla_server_init(nla) < 1)
goto fail_auth;
/* 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_auth;
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_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;
}
else
{
rc = 0;
}
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_credentials(nla))
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)
{
WINPR_ASSERT(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;
WINPR_ASSERT(number || (size == 0));
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;
WINPR_ASSERT(number || (size == 0));
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;
WINPR_ASSERT(nla);
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;
WINPR_ASSERT(nla);
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 = %" PRIu32 "):", public_key_length);
winpr_HexDump(TAG, WLOG_ERROR, public_key1, public_key_length);
WLog_ERR(TAG, "Actual (length = %" PRIu32 "):", 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;
WINPR_ASSERT(nla);
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 BOOL nla_read_ts_credentials(rdpNla* nla, SecBuffer* data, size_t offset)
{
WinPrAsn1Decoder dec, dec2;
WinPrAsn1_OctetString credentials;
BOOL error;
WinPrAsn1_INTEGER credType;
WINPR_ASSERT(nla);
WINPR_ASSERT(data);
WINPR_ASSERT(data->cbBuffer >= offset);
WinPrAsn1Decoder_InitMem(&dec, WINPR_ASN1_DER, (BYTE*)data->pvBuffer + offset,
data->cbBuffer - offset);
/* TSCredentials */
if (!WinPrAsn1DecReadSequence(&dec, &dec2))
return FALSE;
dec = dec2;
/* credType [0] INTEGER */
if (!WinPrAsn1DecReadContextualInteger(&dec, 0, &error, &credType))
return FALSE;
/* credentials [1] OCTET STRING */
if (!WinPrAsn1DecReadContextualOctetString(&dec, 1, &error, &credentials, FALSE))
return FALSE;
WinPrAsn1Decoder_InitMem(&dec, WINPR_ASN1_DER, credentials.data, credentials.len);
if (credType == 1)
{
WinPrAsn1_OctetString domain;
WinPrAsn1_OctetString username;
WinPrAsn1_OctetString password;
/* TSPasswordCreds */
if (!WinPrAsn1DecReadSequence(&dec, &dec2))
return FALSE;
dec = dec2;
/* domainName [0] OCTET STRING */
if (!WinPrAsn1DecReadContextualOctetString(&dec, 0, &error, &domain, FALSE) && error)
return FALSE;
/* userName [1] OCTET STRING */
if (!WinPrAsn1DecReadContextualOctetString(&dec, 1, &error, &username, FALSE) && error)
return FALSE;
/* password [2] OCTET STRING */
if (!WinPrAsn1DecReadContextualOctetString(&dec, 2, &error, &password, FALSE))
return FALSE;
if (sspi_SetAuthIdentityWithLengthW(nla->identity, (WCHAR*)username.data,
username.len / sizeof(WCHAR), (WCHAR*)domain.data,
domain.len / sizeof(WCHAR), (WCHAR*)password.data,
password.len / sizeof(WCHAR)) < 0)
return FALSE;
}
return TRUE;
}
/**
* Encode TSCredentials structure.
* @param credssp
*/
static BOOL nla_encode_ts_credentials(rdpNla* nla)
{
rdpSettings* settings;
BOOL ret = FALSE;
WinPrAsn1Encoder* enc;
size_t length;
wStream s;
int credType;
WINPR_ASSERT(nla);
WINPR_ASSERT(nla->rdpcontext);
settings = nla->rdpcontext->settings;
WINPR_ASSERT(settings);
enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
if (!enc)
return FALSE;
/* TSCredentials */
if (!WinPrAsn1EncSeqContainer(enc))
goto out;
/* credType [0] INTEGER */
credType = settings->SmartcardLogon ? 2 : 1;
if (!WinPrAsn1EncContextualInteger(enc, 0, credType))
goto out;
/* credentials [1] OCTET STRING */
if (!WinPrAsn1EncContextualOctetStringContainer(enc, 1))
goto out;
if (settings->SmartcardLogon)
{
struct
{
WinPrAsn1_tagId tag;
size_t setting_id;
} cspData_fields[] = { { 1, FreeRDP_CardName },
{ 2, FreeRDP_ReaderName },
{ 3, FreeRDP_ContainerName },
{ 4, FreeRDP_CspName } };
WinPrAsn1_OctetString octet_string = { 0 };
char* str;
BOOL ret;
/* TSSmartCardCreds */
if (!WinPrAsn1EncSeqContainer(enc))
goto out;
/* pin [0] OCTET STRING */
str = freerdp_settings_get_string_writable(settings, FreeRDP_Password);
octet_string.len =
ConvertToUnicode(CP_UTF8, 0, str, -1, (LPWSTR*)&octet_string.data, 0) * sizeof(WCHAR);
ret = WinPrAsn1EncContextualOctetString(enc, 0, &octet_string);
free(octet_string.data);
if (!ret)
goto out;
/* cspData [1] SEQUENCE */
if (!WinPrAsn1EncContextualSeqContainer(enc, 1))
goto out;
/* keySpec [0] INTEGER */
if (!WinPrAsn1EncContextualInteger(enc, 0,
freerdp_settings_get_uint32(settings, FreeRDP_KeySpec)))
goto out;
for (int i = 0; i < ARRAYSIZE(cspData_fields); i++)
{
str = freerdp_settings_get_string_writable(settings, cspData_fields[i].setting_id);
octet_string.len =
ConvertToUnicode(CP_UTF8, 0, str, -1, (LPWSTR*)&octet_string.data, 0) *
sizeof(WCHAR);
if (octet_string.len)
{
ret = WinPrAsn1EncContextualOctetString(enc, cspData_fields[i].tag, &octet_string);
free(octet_string.data);
if (!ret)
goto out;
}
}
/* End cspData */
if (!WinPrAsn1EncEndContainer(enc))
goto out;
/* End TSSmartCardCreds */
if (!WinPrAsn1EncEndContainer(enc))
goto out;
}
else
{
WinPrAsn1_OctetString username = { 0 };
WinPrAsn1_OctetString domain = { 0 };
WinPrAsn1_OctetString password = { 0 };
/* TSPasswordCreds */
if (!WinPrAsn1EncSeqContainer(enc))
goto out;
if (!settings->DisableCredentialsDelegation && nla->identity)
{
username.len = nla->identity->UserLength * 2;
username.data = (BYTE*)nla->identity->User;
domain.len = nla->identity->DomainLength * 2;
domain.data = (BYTE*)nla->identity->Domain;
password.len = nla->identity->PasswordLength * 2;
password.data = (BYTE*)nla->identity->Password;
}
if (!WinPrAsn1EncContextualOctetString(enc, 0, &domain))
goto out;
if (!WinPrAsn1EncContextualOctetString(enc, 1, &username))
goto out;
if (!WinPrAsn1EncContextualOctetString(enc, 2, &password))
goto out;
/* End TSPasswordCreds */
if (!WinPrAsn1EncEndContainer(enc))
goto out;
}
/* End credentials | End TSCredentials */
if (!WinPrAsn1EncEndContainer(enc) || !WinPrAsn1EncEndContainer(enc))
goto out;
if (!WinPrAsn1EncStreamSize(enc, &length))
goto out;
if (!nla_sec_buffer_alloc(&nla->tsCredentials, length))
{
WLog_ERR(TAG, "sspi_SecBufferAlloc failed!");
goto out;
}
Stream_StaticInit(&s, (BYTE*)nla->tsCredentials.pvBuffer, length);
if (WinPrAsn1EncToStream(enc, &s))
ret = TRUE;
out:
WinPrAsn1Encoder_Free(&enc);
return ret;
}
static SECURITY_STATUS nla_encrypt_ts_credentials(rdpNla* nla)
{
SECURITY_STATUS status;
WINPR_ASSERT(nla);
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;
WINPR_ASSERT(nla);
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;
}
/**
* Send CredSSP message.
* @param credssp
*/
BOOL nla_send(rdpNla* nla)
{
BOOL rc = FALSE;
wStream* s = NULL;
size_t length;
WinPrAsn1Encoder* enc;
WinPrAsn1_OctetString octet_string;
WINPR_ASSERT(nla);
enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
if (!enc)
return FALSE;
/* TSRequest */
WLog_DBG(TAG, "----->> sending...");
if (!WinPrAsn1EncSeqContainer(enc))
goto fail;
/* version [0] INTEGER */
WLog_DBG(TAG, " ----->> protocol version %" PRIu32, nla->version);
if (!WinPrAsn1EncContextualInteger(enc, 0, nla->version))
goto fail;
/* negoTokens [1] SEQUENCE OF SEQUENCE */
if (nla->negoToken.cbBuffer > 0)
{
WLog_DBG(TAG, " ----->> auth info");
if (!WinPrAsn1EncContextualSeqContainer(enc, 1) || !WinPrAsn1EncSeqContainer(enc))
goto fail;
/* negoToken [0] OCTET STRING */
octet_string.data = nla->negoToken.pvBuffer;
octet_string.len = nla->negoToken.cbBuffer;
if (!WinPrAsn1EncContextualOctetString(enc, 0, &octet_string))
goto fail;
/* End negoTokens (SEQUENCE OF SEQUENCE) */
if (!WinPrAsn1EncEndContainer(enc) || !WinPrAsn1EncEndContainer(enc))
goto fail;
}
/* authInfo [2] OCTET STRING */
if (nla->authInfo.cbBuffer > 0)
{
WLog_DBG(TAG, " ----->> public key auth");
octet_string.data = nla->authInfo.pvBuffer;
octet_string.len = nla->authInfo.cbBuffer;
if (!WinPrAsn1EncContextualOctetString(enc, 2, &octet_string))
goto fail;
}
/* pubKeyAuth [3] OCTET STRING */
if (nla->pubKeyAuth.cbBuffer > 0)
{
WLog_DBG(TAG, " ----->> public key auth");
octet_string.data = nla->pubKeyAuth.pvBuffer;
octet_string.len = nla->pubKeyAuth.cbBuffer;
if (!WinPrAsn1EncContextualOctetString(enc, 3, &octet_string))
goto fail;
}
/* errorCode [4] INTEGER */
if (nla->errorCode && nla->peerVersion >= 3 && nla->peerVersion != 5)
{
char buffer[1024];
WLog_DBG(TAG, " ----->> error code %s 0x%08" PRIx32,
winpr_strerror(nla->errorCode, buffer, sizeof(buffer)), nla->errorCode);
if (!WinPrAsn1EncContextualInteger(enc, 4, nla->errorCode))
goto fail;
}
/* clientNonce [5] OCTET STRING */
if (nla->ClientNonce.cbBuffer > 0)
{
WLog_DBG(TAG, " ----->> client nonce");
octet_string.data = nla->ClientNonce.pvBuffer;
octet_string.len = nla->ClientNonce.cbBuffer;
if (!WinPrAsn1EncContextualOctetString(enc, 5, &octet_string))
goto fail;
}
/* End TSRequest */
if (!WinPrAsn1EncEndContainer(enc))
goto fail;
if (!WinPrAsn1EncStreamSize(enc, &length))
goto fail;
s = Stream_New(NULL, length);
if (!s)
goto fail;
if (!WinPrAsn1EncToStream(enc, s))
goto fail;
WLog_DBG(TAG, "[%" PRIuz " bytes]", length);
if (transport_write(nla->transport, s) < 0)
goto fail;
rc = TRUE;
fail:
Stream_Free(s, TRUE);
WinPrAsn1Encoder_Free(&enc);
return rc;
}
static int nla_decode_ts_request(rdpNla* nla, wStream* s)
{
WinPrAsn1Decoder dec, dec2, dec3;
BOOL error;
WinPrAsn1_tagId tag;
WinPrAsn1_OctetString octet_string;
WinPrAsn1_INTEGER val;
UINT32 version = 0;
char buffer[1024];
WINPR_ASSERT(nla);
WINPR_ASSERT(s);
WinPrAsn1Decoder_Init(&dec, WINPR_ASN1_DER, s);
WLog_DBG(TAG, "<<----- receiving...");
/* TSRequest */
if (!WinPrAsn1DecReadSequence(&dec, &dec2))
return -1;
dec = dec2;
/* version [0] INTEGER */
if (!WinPrAsn1DecReadContextualInteger(&dec, 0, &error, &val))
return -1;
version = (UINT)val;
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);
return -1;
}
while (WinPrAsn1DecReadContextualTag(&dec, &tag, &dec2))
{
switch (tag)
{
case 1:
WLog_DBG(TAG, " <<----- nego token");
/* negoTokens [1] SEQUENCE OF SEQUENCE */
if (!WinPrAsn1DecReadSequence(&dec2, &dec3) ||
!WinPrAsn1DecReadSequence(&dec3, &dec2))
return -1;
/* negoToken [0] OCTET STRING */
if (!WinPrAsn1DecReadContextualOctetString(&dec2, 0, &error, &octet_string,
FALSE) &&
error)
return -1;
if (!nla_sec_buffer_alloc_from_data(&nla->negoToken, octet_string.data, 0,
octet_string.len))
return -1;
break;
case 2:
WLog_DBG(TAG, " <<----- auth info");
/* authInfo [2] OCTET STRING */
if (!WinPrAsn1DecReadOctetString(&dec2, &octet_string, FALSE))
return -1;
if (!nla_sec_buffer_alloc_from_data(&nla->authInfo, octet_string.data, 0,
octet_string.len))
return -1;
break;
case 3:
WLog_DBG(TAG, " <<----- public key info");
/* pubKeyAuth [3] OCTET STRING */
if (!WinPrAsn1DecReadOctetString(&dec2, &octet_string, FALSE))
return -1;
if (!nla_sec_buffer_alloc_from_data(&nla->pubKeyAuth, octet_string.data, 0,
octet_string.len))
return -1;
break;
case 4:
/* errorCode [4] INTEGER */
if (!WinPrAsn1DecReadInteger(&dec2, &val))
return -1;
nla->errorCode = (UINT)val;
WLog_DBG(TAG, " <<----- error code %s 0x%08" PRIx32,
winpr_strerror(nla->errorCode, buffer, sizeof(buffer)), nla->errorCode);
break;
case 5:
WLog_DBG(TAG, " <<----- client nonce");
/* clientNonce [5] OCTET STRING */
if (!WinPrAsn1DecReadOctetString(&dec2, &octet_string, FALSE))
return -1;
if (!nla_sec_buffer_alloc_from_data(&nla->ClientNonce, octet_string.data, 0,
octet_string.len))
return -1;
break;
default:
return -1;
}
}
return 1;
}
int nla_recv_pdu(rdpNla* nla, wStream* s)
{
WINPR_ASSERT(nla);
WINPR_ASSERT(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->rdpcontext, code);
return -1;
}
return nla_client_recv(nla);
}
int nla_server_recv(rdpNla* nla)
{
int status = -1;
wStream* s;
WINPR_ASSERT(nla);
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)
{
WINPR_ASSERT(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(rdpContext* context, rdpTransport* transport)
{
rdpNla* nla = (rdpNla*)calloc(1, sizeof(rdpNla));
rdpSettings* settings;
WINPR_ASSERT(transport);
WINPR_ASSERT(context);
settings = context->settings;
WINPR_ASSERT(settings);
if (!nla)
return NULL;
nla->identity = (SEC_WINNT_AUTH_IDENTITY*)&nla->identityWinPr;
nla->identity->Flags = SEC_WINNT_AUTH_IDENTITY_EXTENDED;
nla->rdpcontext = context;
nla->server = settings->ServerMode;
nla->transport = transport;
nla->sendSeqNum = 0;
nla->recvSeqNum = 0;
nla->version = 6;
nla->kerberosSettings = &nla->identityWinPr.kerberosSettings;
SecInvalidateHandle(&nla->context);
if (settings->NtlmSamFile)
{
nla->SamFile = _strdup(settings->NtlmSamFile);
if (!nla->SamFile)
goto cleanup;
}
if (settings->SspiModule)
{
nla->SspiModule = _strdup(settings->SspiModule);
if (!nla->SspiModule)
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 = RegQueryValueExA(hKey, "SspiModule", NULL, &dwType, NULL, &dwSize);
if (status != ERROR_SUCCESS)
{
RegCloseKey(hKey);
return nla;
}
nla->SspiModule = (LPSTR)malloc(dwSize + sizeof(CHAR));
if (!nla->SspiModule)
{
RegCloseKey(hKey);
goto cleanup;
}
status =
RegQueryValueExA(hKey, "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;
free(nla->SspiModule);
nla->SspiModule = NULL;
nla_buffer_free(nla);
sspi_SecBufferFree(&nla->ClientNonce);
sspi_SecBufferFree(&nla->PublicKey);
sspi_SecBufferFree(&nla->tsCredentials);
free(nla->ServicePrincipalName);
free(nla->kerberosSettings->kdcUrl);
free(nla->kerberosSettings->armorCache);
free(nla->kerberosSettings->cache);
free(nla->kerberosSettings->pkinitX509Anchors);
free(nla->kerberosSettings->pkinitX509Identity);
sspi_FreeAuthIdentity(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_set_sspi_module(rdpNla* nla, const char* sspiModule)
{
if (!nla)
return FALSE;
if (nla->SspiModule)
{
free(nla->SspiModule);
nla->SspiModule = NULL;
}
if (!sspiModule)
return TRUE;
nla->SspiModule = _strdup(sspiModule);
if (!nla->SspiModule)
return FALSE;
return TRUE;
}
BOOL nla_sspi_module_init(rdpNla* nla)
{
if (!nla)
return FALSE;
if (nla->SspiModule)
{
INIT_SECURITY_INTERFACE pInitSecurityInterface;
HMODULE hSSPI = LoadLibraryX(nla->SspiModule);
if (!hSSPI)
{
WLog_ERR(TAG, "Failed to load SSPI module: %s", nla->SspiModule);
return FALSE;
}
#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);
}
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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