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FreeRDP/libfreerdp/core/license.c

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/*
* FreeRDP: A Remote Desktop Protocol Implementation
* RDP Licensing
*
* Copyright 2011-2013 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2014 Norbert Federa <norbert.federa@thincast.com>
* Copyright 2018 David Fort <contact@hardening-consulting.com>
* Copyright 2022,2023 Armin Novak <armin.novak@thincast.com>
* Copyright 2022,2023 Thincast Technologies GmbH
*
* 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 "settings.h"
#include <freerdp/license.h>
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/crypto.h>
#include <winpr/shell.h>
#include <winpr/path.h>
#include <winpr/file.h>
#include <freerdp/log.h>
#include <freerdp/crypto/certificate.h>
#include "license.h"
#include "../crypto/crypto.h"
#include "../crypto/certificate.h"
#define TAG FREERDP_TAG("core.license")
#if 0
#define LICENSE_NULL_CLIENT_RANDOM 1
#define LICENSE_NULL_PREMASTER_SECRET 1
#endif
#define PLATFORM_CHALLENGE_RESPONSE_VERSION 0x0100
/** @brief Licensing Packet Types */
enum LicenseRequestType
{
LICENSE_REQUEST = 0x01,
PLATFORM_CHALLENGE = 0x02,
NEW_LICENSE = 0x03,
UPGRADE_LICENSE = 0x04,
LICENSE_INFO = 0x12,
NEW_LICENSE_REQUEST = 0x13,
PLATFORM_CHALLENGE_RESPONSE = 0x15,
ERROR_ALERT = 0xFF
};
#define LICENSE_PKT_CS_MASK \
(LICENSE_INFO | NEW_LICENSE_REQUEST | PLATFORM_CHALLENGE_RESPONSE | ERROR_ALERT)
#define LICENSE_PKT_SC_MASK \
(LICENSE_REQUEST | PLATFORM_CHALLENGE | NEW_LICENSE | UPGRADE_LICENSE | ERROR_ALERT)
#define LICENSE_PKT_MASK (LICENSE_PKT_CS_MASK | LICENSE_PKT_SC_MASK)
#define LICENSE_PREAMBLE_LENGTH 4
/* Cryptographic Lengths */
#define SERVER_RANDOM_LENGTH 32
#define MASTER_SECRET_LENGTH 48
#define PREMASTER_SECRET_LENGTH 48
#define SESSION_KEY_BLOB_LENGTH 48
#define MAC_SALT_KEY_LENGTH 16
#define LICENSING_ENCRYPTION_KEY_LENGTH 16
#define HWID_PLATFORM_ID_LENGTH 4
#define HWID_UNIQUE_DATA_LENGTH 16
#define HWID_LENGTH 20
#define LICENSING_PADDING_SIZE 8
/* Preamble Flags */
#define PREAMBLE_VERSION_2_0 0x02
#define PREAMBLE_VERSION_3_0 0x03
#define LicenseProtocolVersionMask 0x0F
#define EXTENDED_ERROR_MSG_SUPPORTED 0x80
/** @brief binary Blob Types */
enum
{
BB_ANY_BLOB = 0x0000,
BB_DATA_BLOB = 0x0001,
BB_RANDOM_BLOB = 0x0002,
BB_CERTIFICATE_BLOB = 0x0003,
BB_ERROR_BLOB = 0x0004,
BB_ENCRYPTED_DATA_BLOB = 0x0009,
BB_KEY_EXCHG_ALG_BLOB = 0x000D,
BB_SCOPE_BLOB = 0x000E,
BB_CLIENT_USER_NAME_BLOB = 0x000F,
BB_CLIENT_MACHINE_NAME_BLOB = 0x0010
};
/* License Key Exchange Algorithms */
#define KEY_EXCHANGE_ALG_RSA 0x00000001
/** @brief license Error Codes
*/
enum
{
ERR_INVALID_SERVER_CERTIFICATE = 0x00000001,
ERR_NO_LICENSE = 0x00000002,
ERR_INVALID_MAC = 0x00000003,
ERR_INVALID_SCOPE = 0x00000004,
ERR_NO_LICENSE_SERVER = 0x00000006,
STATUS_VALID_CLIENT = 0x00000007,
ERR_INVALID_CLIENT = 0x00000008,
ERR_INVALID_PRODUCT_ID = 0x0000000B,
ERR_INVALID_MESSAGE_LENGTH = 0x0000000C
};
/** @brief state Transition Codes
*/
enum
{
ST_TOTAL_ABORT = 0x00000001,
ST_NO_TRANSITION = 0x00000002,
ST_RESET_PHASE_TO_START = 0x00000003,
ST_RESEND_LAST_MESSAGE = 0x00000004
};
/** @brief Platform Challenge Types
*/
enum
{
WIN32_PLATFORM_CHALLENGE_TYPE = 0x0100,
WIN16_PLATFORM_CHALLENGE_TYPE = 0x0200,
WINCE_PLATFORM_CHALLENGE_TYPE = 0x0300,
OTHER_PLATFORM_CHALLENGE_TYPE = 0xFF00
};
/** @brief License Detail Levels
*/
enum
{
LICENSE_DETAIL_SIMPLE = 0x0001,
LICENSE_DETAIL_MODERATE = 0x0002,
LICENSE_DETAIL_DETAIL = 0x0003
};
/*
* PlatformId:
*
* The most significant byte of the PlatformId field contains the operating system version of the
* client. The second most significant byte of the PlatformId field identifies the ISV that provided
* the client image. The remaining two bytes in the PlatformId field are used by the ISV to identify
* the build number of the operating system.
*
* 0x04010000:
*
* CLIENT_OS_ID_WINNT_POST_52 (0x04000000)
* CLIENT_IMAGE_ID_MICROSOFT (0x00010000)
*/
enum
{
CLIENT_OS_ID_WINNT_351 = 0x01000000,
CLIENT_OS_ID_WINNT_40 = 0x02000000,
CLIENT_OS_ID_WINNT_50 = 0x03000000,
CLIENT_OS_ID_WINNT_POST_52 = 0x04000000,
CLIENT_IMAGE_ID_MICROSOFT = 0x00010000,
CLIENT_IMAGE_ID_CITRIX = 0x00020000,
};
struct rdp_license
{
LICENSE_STATE state;
LICENSE_TYPE type;
rdpRdp* rdp;
rdpCertificate* certificate;
BYTE HardwareId[HWID_LENGTH];
BYTE ClientRandom[CLIENT_RANDOM_LENGTH];
BYTE ServerRandom[SERVER_RANDOM_LENGTH];
BYTE MasterSecret[MASTER_SECRET_LENGTH];
BYTE PremasterSecret[PREMASTER_SECRET_LENGTH];
BYTE SessionKeyBlob[SESSION_KEY_BLOB_LENGTH];
BYTE MacSaltKey[MAC_SALT_KEY_LENGTH];
BYTE LicensingEncryptionKey[LICENSING_ENCRYPTION_KEY_LENGTH];
LICENSE_PRODUCT_INFO* ProductInfo;
LICENSE_BLOB* ErrorInfo;
LICENSE_BLOB* LicenseInfo; /* Client -> Server */
LICENSE_BLOB* KeyExchangeList;
LICENSE_BLOB* ServerCertificate;
LICENSE_BLOB* ClientUserName;
LICENSE_BLOB* ClientMachineName;
LICENSE_BLOB* PlatformChallenge;
LICENSE_BLOB* EncryptedPremasterSecret;
LICENSE_BLOB* EncryptedPlatformChallenge;
LICENSE_BLOB* EncryptedPlatformChallengeResponse;
LICENSE_BLOB* EncryptedHardwareId;
LICENSE_BLOB* EncryptedLicenseInfo;
BYTE MACData[LICENSING_ENCRYPTION_KEY_LENGTH];
SCOPE_LIST* ScopeList;
UINT32 PacketHeaderLength;
UINT32 PreferredKeyExchangeAlg;
UINT32 PlatformId;
UINT16 ClientType;
UINT16 LicenseDetailLevel;
BOOL update;
};
static BOOL license_send_error_alert(rdpLicense* license, UINT32 dwErrorCode,
UINT32 dwStateTransition, const LICENSE_BLOB* info);
static BOOL license_set_state(rdpLicense* license, LICENSE_STATE state);
static const char* license_get_state_string(LICENSE_STATE state);
static const char* license_preferred_key_exchange_alg_string(UINT32 alg, char* buffer, size_t size)
{
const char* name = NULL;
switch (alg)
{
case KEY_EXCHANGE_ALG_RSA:
name = "KEY_EXCHANGE_ALG_RSA";
break;
default:
name = "KEY_EXCHANGE_ALG_UNKNOWN";
break;
}
_snprintf(buffer, size, "%s [0x%08" PRIx32 "]", name, alg);
return buffer;
}
static const char* license_request_type_string(UINT32 type)
{
switch (type)
{
case LICENSE_REQUEST:
return "LICENSE_REQUEST";
case PLATFORM_CHALLENGE:
return "PLATFORM_CHALLENGE";
case NEW_LICENSE:
return "NEW_LICENSE";
case UPGRADE_LICENSE:
return "UPGRADE_LICENSE";
case LICENSE_INFO:
return "LICENSE_INFO";
case NEW_LICENSE_REQUEST:
return "NEW_LICENSE_REQUEST";
case PLATFORM_CHALLENGE_RESPONSE:
return "PLATFORM_CHALLENGE_RESPONSE";
case ERROR_ALERT:
return "ERROR_ALERT";
default:
return "LICENSE_REQUEST_TYPE_UNKNOWN";
}
}
static const char* licencse_blob_type_string(UINT16 type)
{
switch (type)
{
case BB_ANY_BLOB:
return "BB_ANY_BLOB";
case BB_DATA_BLOB:
return "BB_DATA_BLOB";
case BB_RANDOM_BLOB:
return "BB_RANDOM_BLOB";
case BB_CERTIFICATE_BLOB:
return "BB_CERTIFICATE_BLOB";
case BB_ERROR_BLOB:
return "BB_ERROR_BLOB";
case BB_ENCRYPTED_DATA_BLOB:
return "BB_ENCRYPTED_DATA_BLOB";
case BB_KEY_EXCHG_ALG_BLOB:
return "BB_KEY_EXCHG_ALG_BLOB";
case BB_SCOPE_BLOB:
return "BB_SCOPE_BLOB";
case BB_CLIENT_USER_NAME_BLOB:
return "BB_CLIENT_USER_NAME_BLOB";
case BB_CLIENT_MACHINE_NAME_BLOB:
return "BB_CLIENT_MACHINE_NAME_BLOB";
default:
return "BB_UNKNOWN";
}
}
static wStream* license_send_stream_init(rdpLicense* license);
static void license_generate_randoms(rdpLicense* license);
static BOOL license_generate_keys(rdpLicense* license);
static BOOL license_generate_hwid(rdpLicense* license);
static BOOL license_encrypt_premaster_secret(rdpLicense* license);
static LICENSE_PRODUCT_INFO* license_new_product_info(void);
static void license_free_product_info(LICENSE_PRODUCT_INFO* productInfo);
static BOOL license_read_product_info(wStream* s, LICENSE_PRODUCT_INFO* productInfo);
static LICENSE_BLOB* license_new_binary_blob(UINT16 type);
static void license_free_binary_blob(LICENSE_BLOB* blob);
static BOOL license_read_binary_blob_data(LICENSE_BLOB* blob, UINT16 type, const void* data,
size_t length);
static BOOL license_read_binary_blob(wStream* s, LICENSE_BLOB* blob);
static BOOL license_write_binary_blob(wStream* s, const LICENSE_BLOB* blob);
static SCOPE_LIST* license_new_scope_list(void);
static BOOL license_scope_list_resize(SCOPE_LIST* scopeList, UINT32 count);
static void license_free_scope_list(SCOPE_LIST* scopeList);
static BOOL license_read_scope_list(wStream* s, SCOPE_LIST* scopeList);
static BOOL license_write_scope_list(wStream* s, const SCOPE_LIST* scopeList);
static BOOL license_read_license_request_packet(rdpLicense* license, wStream* s);
static BOOL license_write_license_request_packet(const rdpLicense* license, wStream* s);
static BOOL license_read_platform_challenge_packet(rdpLicense* license, wStream* s);
static BOOL license_send_platform_challenge_packet(rdpLicense* license);
static BOOL license_read_new_or_upgrade_license_packet(rdpLicense* license, wStream* s);
static BOOL license_read_error_alert_packet(rdpLicense* license, wStream* s);
static BOOL license_write_new_license_request_packet(const rdpLicense* license, wStream* s);
static BOOL license_read_new_license_request_packet(rdpLicense* license, wStream* s);
static BOOL license_answer_license_request(rdpLicense* license);
static BOOL license_send_platform_challenge_response(rdpLicense* license);
static BOOL license_read_platform_challenge_response(rdpLicense* license, wStream* s);
static BOOL license_read_client_platform_challenge_response(rdpLicense* license, wStream* s);
static BOOL license_write_client_platform_challenge_response(rdpLicense* license, wStream* s);
static BOOL license_read_server_upgrade_license(rdpLicense* license, wStream* s);
static BOOL license_write_server_upgrade_license(const rdpLicense* license, wStream* s);
static BOOL license_send_license_info(rdpLicense* license, const LICENSE_BLOB* calBlob,
const BYTE* signature, size_t signature_length);
static BOOL license_read_license_info(rdpLicense* license, wStream* s);
static state_run_t license_client_recv(rdpLicense* license, wStream* s);
static state_run_t license_server_recv(rdpLicense* license, wStream* s);
#define PLATFORMID (CLIENT_OS_ID_WINNT_POST_52 | CLIENT_IMAGE_ID_MICROSOFT)
#ifdef WITH_DEBUG_LICENSE
static const char* const error_codes[] = { "ERR_UNKNOWN",
"ERR_INVALID_SERVER_CERTIFICATE",
"ERR_NO_LICENSE",
"ERR_INVALID_MAC",
"ERR_INVALID_SCOPE",
"ERR_UNKNOWN",
"ERR_NO_LICENSE_SERVER",
"STATUS_VALID_CLIENT",
"ERR_INVALID_CLIENT",
"ERR_UNKNOWN",
"ERR_UNKNOWN",
"ERR_INVALID_PRODUCT_ID",
"ERR_INVALID_MESSAGE_LENGTH" };
static const char* const state_transitions[] = { "ST_UNKNOWN", "ST_TOTAL_ABORT", "ST_NO_TRANSITION",
"ST_RESET_PHASE_TO_START",
"ST_RESEND_LAST_MESSAGE" };
static void license_print_product_info(const LICENSE_PRODUCT_INFO* productInfo)
{
char* CompanyName = NULL;
char* ProductId = NULL;
WINPR_ASSERT(productInfo);
WINPR_ASSERT(productInfo->pbCompanyName);
WINPR_ASSERT(productInfo->pbProductId);
CompanyName = ConvertWCharNToUtf8Alloc((const WCHAR*)productInfo->pbCompanyName,
productInfo->cbCompanyName / sizeof(WCHAR), NULL);
ProductId = ConvertWCharNToUtf8Alloc((const WCHAR*)productInfo->pbProductId,
productInfo->cbProductId / sizeof(WCHAR), NULL);
WLog_INFO(TAG, "ProductInfo:");
WLog_INFO(TAG, "\tdwVersion: 0x%08" PRIX32 "", productInfo->dwVersion);
WLog_INFO(TAG, "\tCompanyName: %s", CompanyName);
WLog_INFO(TAG, "\tProductId: %s", ProductId);
free(CompanyName);
free(ProductId);
}
static void license_print_scope_list(const SCOPE_LIST* scopeList)
{
WINPR_ASSERT(scopeList);
WLog_INFO(TAG, "ScopeList (%" PRIu32 "):", scopeList->count);
for (UINT32 index = 0; index < scopeList->count; index++)
{
const LICENSE_BLOB* scope = NULL;
WINPR_ASSERT(scopeList->array);
scope = scopeList->array[index];
WINPR_ASSERT(scope);
WLog_INFO(TAG, "\t%s", (const char*)scope->data);
}
}
#endif
static const char licenseStore[] = "licenses";
static BOOL license_ensure_state(rdpLicense* license, LICENSE_STATE state, UINT32 msg)
{
const LICENSE_STATE cstate = license_get_state(license);
WINPR_ASSERT(license);
if (cstate != state)
{
const char* scstate = license_get_state_string(cstate);
const char* sstate = license_get_state_string(state);
const char* where = license_request_type_string(msg);
WLog_WARN(TAG, "Received [%s], but found invalid licensing state %s, expected %s", where,
scstate, sstate);
return FALSE;
}
return TRUE;
}
state_run_t license_recv(rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
WINPR_ASSERT(license->rdp->settings);
if (freerdp_settings_get_bool(license->rdp->settings, FreeRDP_ServerMode))
return license_server_recv(license, s);
else
return license_client_recv(license, s);
}
static BOOL license_check_stream_length(wStream* s, SSIZE_T expect, const char* where)
{
const size_t remain = Stream_GetRemainingLength(s);
WINPR_ASSERT(where);
if (expect < 0)
{
WLog_WARN(TAG, "invalid %s, expected value %" PRIdz " invalid", where, expect);
return FALSE;
}
if (remain < (size_t)expect)
{
WLog_WARN(TAG, "short %s, expected %" PRIdz " bytes, got %" PRIuz, where, expect, remain);
return FALSE;
}
return TRUE;
}
static BOOL license_check_stream_capacity(wStream* s, size_t expect, const char* where)
{
WINPR_ASSERT(where);
if (!Stream_CheckAndLogRequiredCapacityEx(TAG, WLOG_WARN, s, expect, 1, "%s(%s:%" PRIuz ") %s",
__func__, __FILE__, (size_t)__LINE__, where))
return FALSE;
return TRUE;
}
static BOOL computeCalHash(const char* hostname, char* hashStr, size_t len)
{
WINPR_DIGEST_CTX* sha1 = NULL;
BOOL ret = FALSE;
BYTE hash[20] = { 0 };
WINPR_ASSERT(hostname);
WINPR_ASSERT(hashStr);
if (len < 2 * sizeof(hash) + 1)
return FALSE;
if (!(sha1 = winpr_Digest_New()))
goto out;
if (!winpr_Digest_Init(sha1, WINPR_MD_SHA1))
goto out;
if (!winpr_Digest_Update(sha1, (const BYTE*)hostname, strlen(hostname)))
goto out;
if (!winpr_Digest_Final(sha1, hash, sizeof(hash)))
goto out;
for (size_t i = 0; i < sizeof(hash); i++, hashStr += 2)
sprintf_s(hashStr, 3, "%.2x", hash[i]);
ret = TRUE;
out:
if (!ret)
WLog_ERR(TAG, "failed to generate SHA1 of hostname '%s'", hostname);
winpr_Digest_Free(sha1);
return ret;
}
static BOOL saveCal(const rdpSettings* settings, const BYTE* data, size_t length,
const char* hostname)
{
char hash[41] = { 0 };
FILE* fp = NULL;
char* licenseStorePath = NULL;
char filename[MAX_PATH] = { 0 };
char filenameNew[MAX_PATH] = { 0 };
char* filepath = NULL;
char* filepathNew = NULL;
size_t written = 0;
BOOL ret = FALSE;
const char* path = freerdp_settings_get_string(settings, FreeRDP_ConfigPath);
WINPR_ASSERT(path);
WINPR_ASSERT(data || (length == 0));
WINPR_ASSERT(hostname);
if (!winpr_PathFileExists(path))
{
if (!winpr_PathMakePath(path, 0))
{
WLog_ERR(TAG, "error creating directory '%s'", path);
goto out;
}
WLog_INFO(TAG, "creating directory %s", path);
}
if (!(licenseStorePath = GetCombinedPath(path, licenseStore)))
{
WLog_ERR(TAG, "Failed to get license store path from '%s' + '%s'", path, licenseStore);
goto out;
}
if (!winpr_PathFileExists(licenseStorePath))
{
if (!winpr_PathMakePath(licenseStorePath, 0))
{
WLog_ERR(TAG, "error creating directory '%s'", licenseStorePath);
goto out;
}
WLog_INFO(TAG, "creating directory %s", licenseStorePath);
}
if (!computeCalHash(hostname, hash, sizeof(hash)))
goto out;
sprintf_s(filename, sizeof(filename) - 1, "%s.cal", hash);
sprintf_s(filenameNew, sizeof(filenameNew) - 1, "%s.cal.new", hash);
if (!(filepath = GetCombinedPath(licenseStorePath, filename)))
{
WLog_ERR(TAG, "Failed to get license file path from '%s' + '%s'", path, filename);
goto out;
}
if (!(filepathNew = GetCombinedPath(licenseStorePath, filenameNew)))
{
WLog_ERR(TAG, "Failed to get license new file path from '%s' + '%s'", path, filenameNew);
goto out;
}
fp = winpr_fopen(filepathNew, "wb");
if (!fp)
{
WLog_ERR(TAG, "Failed to open license file '%s'", filepathNew);
goto out;
}
written = fwrite(data, length, 1, fp);
fclose(fp);
if (written != 1)
{
WLog_ERR(TAG, "Failed to write to license file '%s'", filepathNew);
winpr_DeleteFile(filepathNew);
goto out;
}
ret = winpr_MoveFileEx(filepathNew, filepath, MOVEFILE_REPLACE_EXISTING);
if (!ret)
WLog_ERR(TAG, "Failed to move license file '%s' to '%s'", filepathNew, filepath);
out:
free(filepathNew);
free(filepath);
free(licenseStorePath);
return ret;
}
static BYTE* loadCalFile(const rdpSettings* settings, const char* hostname, size_t* dataLen)
{
char* licenseStorePath = NULL;
char* calPath = NULL;
char calFilename[MAX_PATH] = { 0 };
char hash[41] = { 0 };
INT64 length = 0;
size_t status = 0;
FILE* fp = NULL;
BYTE* ret = NULL;
WINPR_ASSERT(settings);
WINPR_ASSERT(hostname);
WINPR_ASSERT(dataLen);
if (!computeCalHash(hostname, hash, sizeof(hash)))
{
WLog_ERR(TAG, "loadCalFile: unable to compute hostname hash");
return NULL;
}
sprintf_s(calFilename, sizeof(calFilename) - 1, "%s.cal", hash);
if (!(licenseStorePath = GetCombinedPath(
freerdp_settings_get_string(settings, FreeRDP_ConfigPath), licenseStore)))
return NULL;
if (!(calPath = GetCombinedPath(licenseStorePath, calFilename)))
goto error_path;
fp = winpr_fopen(calPath, "rb");
if (!fp)
goto error_open;
_fseeki64(fp, 0, SEEK_END);
length = _ftelli64(fp);
_fseeki64(fp, 0, SEEK_SET);
if (length < 0)
goto error_malloc;
ret = (BYTE*)malloc((size_t)length);
if (!ret)
goto error_malloc;
status = fread(ret, (size_t)length, 1, fp);
if (status == 0)
goto error_read;
*dataLen = (size_t)length;
fclose(fp);
free(calPath);
free(licenseStorePath);
return ret;
error_read:
free(ret);
error_malloc:
fclose(fp);
error_open:
free(calPath);
error_path:
free(licenseStorePath);
return NULL;
}
/**
* Read a licensing preamble.
* msdn{cc240480}
* @param s stream
* @param bMsgType license message type
* @param flags message flags
* @param wMsgSize message size
* @return if the operation completed successfully
*/
static BOOL license_read_preamble(wStream* s, BYTE* bMsgType, BYTE* flags, UINT16* wMsgSize)
{
WINPR_ASSERT(bMsgType);
WINPR_ASSERT(flags);
WINPR_ASSERT(wMsgSize);
/* preamble (4 bytes) */
if (!license_check_stream_length(s, 4, "license preamble"))
return FALSE;
Stream_Read_UINT8(s, *bMsgType); /* bMsgType (1 byte) */
Stream_Read_UINT8(s, *flags); /* flags (1 byte) */
Stream_Read_UINT16(s, *wMsgSize); /* wMsgSize (2 bytes) */
return license_check_stream_length(s, *wMsgSize - 4ll, "license preamble::wMsgSize");
}
/**
* Write a licensing preamble.
* msdn{cc240480}
* @param s stream
* @param bMsgType license message type
* @param flags message flags
* @param wMsgSize message size
* @return if the operation completed successfully
*/
static BOOL license_write_preamble(wStream* s, BYTE bMsgType, BYTE flags, UINT16 wMsgSize)
{
if (!Stream_EnsureRemainingCapacity(s, 4))
return FALSE;
/* preamble (4 bytes) */
Stream_Write_UINT8(s, bMsgType); /* bMsgType (1 byte) */
Stream_Write_UINT8(s, flags); /* flags (1 byte) */
Stream_Write_UINT16(s, wMsgSize); /* wMsgSize (2 bytes) */
return TRUE;
}
/**
* @brief Initialize a license packet stream.
*
* @param license license module
*
* @return stream or NULL
*/
wStream* license_send_stream_init(rdpLicense* license)
{
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
const BOOL do_crypt = license->rdp->do_crypt;
license->rdp->sec_flags = SEC_LICENSE_PKT;
/*
* Encryption of licensing packets is optional even if the rdp security
* layer is used. If the peer has not indicated that it is capable of
* processing encrypted licensing packets (rdp->do_crypt_license) we turn
* off encryption (via rdp->do_crypt) before initializing the rdp stream
* and reenable it afterwards.
*/
if (do_crypt)
{
license->rdp->sec_flags |= SEC_LICENSE_ENCRYPT_CS;
license->rdp->do_crypt = license->rdp->do_crypt_license;
}
wStream* s = rdp_send_stream_init(license->rdp);
if (!s)
return NULL;
license->rdp->do_crypt = do_crypt;
license->PacketHeaderLength = (UINT16)Stream_GetPosition(s);
if (!Stream_SafeSeek(s, LICENSE_PREAMBLE_LENGTH))
goto fail;
return s;
fail:
Stream_Release(s);
return NULL;
}
/**
* Send an RDP licensing packet.
* msdn{cc240479}
* @param license license module
* @param s stream
*/
static BOOL license_send(rdpLicense* license, wStream* s, BYTE type)
{
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
rdpRdp* rdp = license->rdp;
WINPR_ASSERT(rdp->settings);
DEBUG_LICENSE("Sending %s Packet", license_request_type_string(type));
const size_t length = Stream_GetPosition(s);
WINPR_ASSERT(length >= license->PacketHeaderLength);
WINPR_ASSERT(length <= UINT16_MAX + license->PacketHeaderLength);
const UINT16 wMsgSize = (UINT16)(length - license->PacketHeaderLength);
Stream_SetPosition(s, license->PacketHeaderLength);
BYTE flags = PREAMBLE_VERSION_3_0;
/**
* Using EXTENDED_ERROR_MSG_SUPPORTED here would cause mstsc to crash when
* running in server mode! This flag seems to be incorrectly documented.
*/
if (!rdp->settings->ServerMode)
flags |= EXTENDED_ERROR_MSG_SUPPORTED;
if (!license_write_preamble(s, type, flags, wMsgSize))
return FALSE;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "Sending %s Packet, length %" PRIu16 "", license_request_type_string(type),
wMsgSize);
winpr_HexDump(TAG, WLOG_DEBUG, Stream_PointerAs(s, char) - LICENSE_PREAMBLE_LENGTH, wMsgSize);
#endif
Stream_SetPosition(s, length);
const BOOL ret = rdp_send(rdp, s, MCS_GLOBAL_CHANNEL_ID);
rdp->sec_flags = 0;
return ret;
}
BOOL license_read_server_upgrade_license(rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
if (!license_read_binary_blob(s, license->EncryptedLicenseInfo))
return FALSE;
if (!license_check_stream_length(s, sizeof(license->MACData),
"SERVER_UPGRADE_LICENSE::MACData"))
return FALSE;
Stream_Read(s, license->MACData, sizeof(license->MACData));
return TRUE;
}
BOOL license_write_server_upgrade_license(const rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
if (!license_write_binary_blob(s, license->EncryptedLicenseInfo))
return FALSE;
if (!license_check_stream_capacity(s, sizeof(license->MACData),
"SERVER_UPGRADE_LICENSE::MACData"))
return FALSE;
Stream_Write(s, license->MACData, sizeof(license->MACData));
return TRUE;
}
static BOOL license_server_send_new_or_upgrade_license(rdpLicense* license, BOOL upgrade)
{
wStream* s = license_send_stream_init(license);
const BYTE type = upgrade ? UPGRADE_LICENSE : NEW_LICENSE;
if (!s)
return FALSE;
if (!license_write_server_upgrade_license(license, s))
goto fail;
return license_send(license, s, type);
fail:
Stream_Release(s);
return FALSE;
}
/**
* Receive an RDP licensing packet.
* msdn{cc240479}
* @param license license module
* @param s stream
* @return if the operation completed successfully
*/
state_run_t license_client_recv(rdpLicense* license, wStream* s)
{
BYTE flags = 0;
BYTE bMsgType = 0;
UINT16 wMsgSize = 0;
const size_t length = Stream_GetRemainingLength(s);
WINPR_ASSERT(license);
if (!license_read_preamble(s, &bMsgType, &flags, &wMsgSize)) /* preamble (4 bytes) */
return STATE_RUN_FAILED;
DEBUG_LICENSE("Receiving %s Packet", license_request_type_string(bMsgType));
switch (bMsgType)
{
case LICENSE_REQUEST:
/* Client does not require configuration, so skip this state */
if (license_get_state(license) == LICENSE_STATE_INITIAL)
license_set_state(license, LICENSE_STATE_CONFIGURED);
if (!license_ensure_state(license, LICENSE_STATE_CONFIGURED, bMsgType))
return STATE_RUN_FAILED;
if (!license_read_license_request_packet(license, s))
return STATE_RUN_FAILED;
if (!license_answer_license_request(license))
return STATE_RUN_FAILED;
license_set_state(license, LICENSE_STATE_NEW_REQUEST);
break;
case PLATFORM_CHALLENGE:
if (!license_ensure_state(license, LICENSE_STATE_NEW_REQUEST, bMsgType))
return STATE_RUN_FAILED;
if (!license_read_platform_challenge_packet(license, s))
return STATE_RUN_FAILED;
if (!license_send_platform_challenge_response(license))
return STATE_RUN_FAILED;
license_set_state(license, LICENSE_STATE_PLATFORM_CHALLENGE_RESPONSE);
break;
case NEW_LICENSE:
case UPGRADE_LICENSE:
if (!license_ensure_state(license, LICENSE_STATE_PLATFORM_CHALLENGE_RESPONSE, bMsgType))
return STATE_RUN_FAILED;
if (!license_read_new_or_upgrade_license_packet(license, s))
return STATE_RUN_FAILED;
break;
case ERROR_ALERT:
if (!license_read_error_alert_packet(license, s))
return STATE_RUN_FAILED;
break;
default:
WLog_ERR(TAG, "invalid bMsgType:%" PRIu8 "", bMsgType);
return STATE_RUN_FAILED;
}
if (!tpkt_ensure_stream_consumed(s, length))
return STATE_RUN_FAILED;
return STATE_RUN_SUCCESS;
}
state_run_t license_server_recv(rdpLicense* license, wStream* s)
{
state_run_t rc = STATE_RUN_FAILED;
BYTE flags = 0;
BYTE bMsgType = 0;
UINT16 wMsgSize = 0;
const size_t length = Stream_GetRemainingLength(s);
WINPR_ASSERT(license);
if (!license_read_preamble(s, &bMsgType, &flags, &wMsgSize)) /* preamble (4 bytes) */
goto fail;
DEBUG_LICENSE("Receiving %s Packet", license_request_type_string(bMsgType));
switch (bMsgType)
{
case NEW_LICENSE_REQUEST:
if (!license_ensure_state(license, LICENSE_STATE_REQUEST, bMsgType))
goto fail;
if (!license_read_new_license_request_packet(license, s))
goto fail;
// TODO: Validate if client is allowed
if (!license_send_error_alert(license, ERR_INVALID_MAC, ST_TOTAL_ABORT,
license->ErrorInfo))
goto fail;
if (!license_send_platform_challenge_packet(license))
goto fail;
license->update = FALSE;
if (!license_set_state(license, LICENSE_STATE_PLATFORM_CHALLENGE))
goto fail;
break;
case LICENSE_INFO:
if (!license_ensure_state(license, LICENSE_STATE_REQUEST, bMsgType))
goto fail;
if (!license_read_license_info(license, s))
goto fail;
// TODO: Validate license info
if (!license_send_platform_challenge_packet(license))
goto fail;
if (!license_set_state(license, LICENSE_STATE_PLATFORM_CHALLENGE))
goto fail;
license->update = TRUE;
break;
case PLATFORM_CHALLENGE_RESPONSE:
if (!license_ensure_state(license, LICENSE_STATE_PLATFORM_CHALLENGE, bMsgType))
goto fail;
if (!license_read_client_platform_challenge_response(license, s))
goto fail;
// TODO: validate challenge response
if (FALSE)
{
if (license_send_error_alert(license, ERR_INVALID_CLIENT, ST_TOTAL_ABORT,
license->ErrorInfo))
goto fail;
}
else
{
if (!license_server_send_new_or_upgrade_license(license, license->update))
goto fail;
license->type = LICENSE_TYPE_ISSUED;
license_set_state(license, LICENSE_STATE_COMPLETED);
rc = STATE_RUN_CONTINUE; /* License issued, switch state */
}
break;
case ERROR_ALERT:
if (!license_read_error_alert_packet(license, s))
goto fail;
break;
default:
WLog_ERR(TAG, "invalid bMsgType:%" PRIu8 "", bMsgType);
goto fail;
}
if (!tpkt_ensure_stream_consumed(s, length))
goto fail;
if (!state_run_success(rc))
rc = STATE_RUN_SUCCESS;
fail:
if (state_run_failed(rc))
{
if (flags & EXTENDED_ERROR_MSG_SUPPORTED)
license_send_error_alert(license, ERR_INVALID_CLIENT, ST_TOTAL_ABORT, NULL);
license_set_state(license, LICENSE_STATE_ABORTED);
}
return rc;
}
void license_generate_randoms(rdpLicense* license)
{
WINPR_ASSERT(license);
#ifdef LICENSE_NULL_CLIENT_RANDOM
ZeroMemory(license->ClientRandom, sizeof(license->ClientRandom)); /* ClientRandom */
#else
winpr_RAND(license->ClientRandom, sizeof(license->ClientRandom)); /* ClientRandom */
#endif
winpr_RAND(license->ServerRandom, sizeof(license->ServerRandom)); /* ServerRandom */
#ifdef LICENSE_NULL_PREMASTER_SECRET
ZeroMemory(license->PremasterSecret, sizeof(license->PremasterSecret)); /* PremasterSecret */
#else
winpr_RAND(license->PremasterSecret, sizeof(license->PremasterSecret)); /* PremasterSecret */
#endif
}
/**
* Generate License Cryptographic Keys.
* @param license license module
*/
static BOOL license_generate_keys(rdpLicense* license)
{
WINPR_ASSERT(license);
if (
/* MasterSecret */
!security_master_secret(license->PremasterSecret, sizeof(license->PremasterSecret),
license->ClientRandom, sizeof(license->ClientRandom),
license->ServerRandom, sizeof(license->ServerRandom),
license->MasterSecret, sizeof(license->MasterSecret)) ||
/* SessionKeyBlob */
!security_session_key_blob(license->MasterSecret, sizeof(license->MasterSecret),
license->ClientRandom, sizeof(license->ClientRandom),
license->ServerRandom, sizeof(license->ServerRandom),
license->SessionKeyBlob, sizeof(license->SessionKeyBlob)))
{
return FALSE;
}
security_mac_salt_key(license->SessionKeyBlob, sizeof(license->SessionKeyBlob),
license->ClientRandom, sizeof(license->ClientRandom),
license->ServerRandom, sizeof(license->ServerRandom), license->MacSaltKey,
sizeof(license->MacSaltKey)); /* MacSaltKey */
const BOOL ret = security_licensing_encryption_key(
license->SessionKeyBlob, sizeof(license->SessionKeyBlob), license->ClientRandom,
sizeof(license->ClientRandom), license->ServerRandom, sizeof(license->ServerRandom),
license->LicensingEncryptionKey,
sizeof(license->LicensingEncryptionKey)); /* LicensingEncryptionKey */
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "ClientRandom:");
winpr_HexDump(TAG, WLOG_DEBUG, license->ClientRandom, sizeof(license->ClientRandom));
WLog_DBG(TAG, "ServerRandom:");
winpr_HexDump(TAG, WLOG_DEBUG, license->ServerRandom, sizeof(license->ServerRandom));
WLog_DBG(TAG, "PremasterSecret:");
winpr_HexDump(TAG, WLOG_DEBUG, license->PremasterSecret, sizeof(license->PremasterSecret));
WLog_DBG(TAG, "MasterSecret:");
winpr_HexDump(TAG, WLOG_DEBUG, license->MasterSecret, sizeof(license->MasterSecret));
WLog_DBG(TAG, "SessionKeyBlob:");
winpr_HexDump(TAG, WLOG_DEBUG, license->SessionKeyBlob, sizeof(license->SessionKeyBlob));
WLog_DBG(TAG, "MacSaltKey:");
winpr_HexDump(TAG, WLOG_DEBUG, license->MacSaltKey, sizeof(license->MacSaltKey));
WLog_DBG(TAG, "LicensingEncryptionKey:");
winpr_HexDump(TAG, WLOG_DEBUG, license->LicensingEncryptionKey,
sizeof(license->LicensingEncryptionKey));
#endif
return ret;
}
/**
* Generate Unique Hardware Identifier (CLIENT_HARDWARE_ID).
* @param license license module
*/
BOOL license_generate_hwid(rdpLicense* license)
{
const BYTE* hashTarget = NULL;
size_t targetLen = 0;
BYTE macAddress[6] = { 0 };
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
WINPR_ASSERT(license->rdp->settings);
ZeroMemory(license->HardwareId, sizeof(license->HardwareId));
if (license->rdp->settings->OldLicenseBehaviour)
{
hashTarget = macAddress;
targetLen = sizeof(macAddress);
}
else
{
wStream buffer = { 0 };
const char* hostname = license->rdp->settings->ClientHostname;
wStream* s = Stream_StaticInit(&buffer, license->HardwareId, 4);
Stream_Write_UINT32(s, license->PlatformId);
hashTarget = (const BYTE*)hostname;
targetLen = hostname ? strlen(hostname) : 0;
}
/* Allow FIPS override for use of MD5 here, really this does not have to be MD5 as we are just
* taking a MD5 hash of the 6 bytes of 0's(macAddress) */
/* and filling in the Data1-Data4 fields of the CLIENT_HARDWARE_ID structure(from MS-RDPELE
* section 2.2.2.3.1). This is for RDP licensing packets */
/* which will already be encrypted under FIPS, so the use of MD5 here is not for sensitive data
* protection. */
return winpr_Digest_Allow_FIPS(WINPR_MD_MD5, hashTarget, targetLen,
&license->HardwareId[HWID_PLATFORM_ID_LENGTH],
WINPR_MD5_DIGEST_LENGTH);
}
static BOOL license_get_server_rsa_public_key(rdpLicense* license)
{
rdpSettings* settings = NULL;
WINPR_ASSERT(license);
WINPR_ASSERT(license->certificate);
WINPR_ASSERT(license->rdp);
settings = license->rdp->settings;
WINPR_ASSERT(settings);
if (license->ServerCertificate->length < 1)
{
if (!freerdp_certificate_read_server_cert(license->certificate, settings->ServerCertificate,
settings->ServerCertificateLength))
return FALSE;
}
return TRUE;
}
BOOL license_encrypt_premaster_secret(rdpLicense* license)
{
WINPR_ASSERT(license);
WINPR_ASSERT(license->certificate);
if (!license_get_server_rsa_public_key(license))
return FALSE;
WINPR_ASSERT(license->EncryptedPremasterSecret);
const rdpCertInfo* info = freerdp_certificate_get_info(license->certificate);
if (!info)
{
WLog_ERR(TAG, "info=%p, license->certificate=%p", info, license->certificate);
return FALSE;
}
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "Modulus (%" PRIu32 " bits):", info->ModulusLength * 8);
winpr_HexDump(TAG, WLOG_DEBUG, info->Modulus, info->ModulusLength);
WLog_DBG(TAG, "Exponent:");
winpr_HexDump(TAG, WLOG_DEBUG, info->exponent, sizeof(info->exponent));
#endif
BYTE* EncryptedPremasterSecret = (BYTE*)calloc(1, info->ModulusLength);
if (!EncryptedPremasterSecret)
{
WLog_ERR(TAG, "EncryptedPremasterSecret=%p, info->ModulusLength=%" PRIu32,
EncryptedPremasterSecret, info->ModulusLength);
return FALSE;
}
license->EncryptedPremasterSecret->type = BB_RANDOM_BLOB;
license->EncryptedPremasterSecret->length = sizeof(license->PremasterSecret);
#ifndef LICENSE_NULL_PREMASTER_SECRET
{
const SSIZE_T length =
crypto_rsa_public_encrypt(license->PremasterSecret, sizeof(license->PremasterSecret),
info, EncryptedPremasterSecret, info->ModulusLength);
if ((length < 0) || (length > UINT16_MAX))
{
WLog_ERR(TAG, "RSA public encrypt length=%" PRIdz " < 0 || > %" PRIu16, length,
UINT16_MAX);
return FALSE;
}
license->EncryptedPremasterSecret->length = (UINT16)length;
}
#endif
license->EncryptedPremasterSecret->data = EncryptedPremasterSecret;
return TRUE;
}
static BOOL license_rc4_with_licenseKey(const rdpLicense* license, const BYTE* input, size_t len,
LICENSE_BLOB* target)
{
WINPR_ASSERT(license);
WINPR_ASSERT(input || (len == 0));
WINPR_ASSERT(target);
WINPR_ASSERT(len <= UINT16_MAX);
WINPR_RC4_CTX* rc4 = winpr_RC4_New_Allow_FIPS(license->LicensingEncryptionKey,
sizeof(license->LicensingEncryptionKey));
if (!rc4)
{
WLog_ERR(TAG, "Failed to allocate RC4");
return FALSE;
}
BYTE* buffer = (BYTE*)realloc(target->data, len);
if (!buffer)
goto error_buffer;
target->data = buffer;
target->length = (UINT16)len;
if (!winpr_RC4_Update(rc4, len, input, buffer))
goto error_buffer;
winpr_RC4_Free(rc4);
return TRUE;
error_buffer:
WLog_ERR(TAG, "Failed to create/update RC4: len=%" PRIuz ", buffer=%p", len, buffer);
winpr_RC4_Free(rc4);
return FALSE;
}
/**
* Encrypt the input using the license key and MAC the input for a signature
*
* @param license rdpLicense to get keys and salt from
* @param input the input data to encrypt and MAC
* @param len size of input
* @param target a target LICENSE_BLOB where the encrypted input will be stored
* @param mac the signature buffer (16 bytes)
* @return if the operation completed successfully
*/
static BOOL license_encrypt_and_MAC(rdpLicense* license, const BYTE* input, size_t len,
LICENSE_BLOB* target, BYTE* mac, size_t mac_length)
{
WINPR_ASSERT(license);
return license_rc4_with_licenseKey(license, input, len, target) &&
security_mac_data(license->MacSaltKey, sizeof(license->MacSaltKey), input, len, mac,
mac_length);
}
/**
* Decrypt the input using the license key and check the MAC
*
* @param license rdpLicense to get keys and salt from
* @param input the input data to decrypt and MAC
* @param len size of input
* @param target a target LICENSE_BLOB where the decrypted input will be stored
* @param packetMac the signature buffer (16 bytes)
*
* @return if the operation completed successfully
*/
static BOOL license_decrypt_and_check_MAC(rdpLicense* license, const BYTE* input, size_t len,
LICENSE_BLOB* target, const BYTE* packetMac)
{
BYTE macData[sizeof(license->MACData)] = { 0 };
WINPR_ASSERT(license);
WINPR_ASSERT(target);
if (freerdp_settings_get_bool(license->rdp->settings, FreeRDP_TransportDumpReplay))
{
WLog_DBG(TAG, "TransportDumpReplay active, skipping...");
return TRUE;
}
if (!license_rc4_with_licenseKey(license, input, len, target))
return FALSE;
if (!security_mac_data(license->MacSaltKey, sizeof(license->MacSaltKey), target->data, len,
macData, sizeof(macData)))
return FALSE;
if (memcmp(packetMac, macData, sizeof(macData)) != 0)
{
WLog_ERR(TAG, "packetMac != expectedMac");
return FALSE;
}
return TRUE;
}
/**
* Read Product Information (PRODUCT_INFO).
* msdn{cc241915}
* @param s stream
* @param productInfo product information
*/
BOOL license_read_product_info(wStream* s, LICENSE_PRODUCT_INFO* productInfo)
{
WINPR_ASSERT(productInfo);
if (!license_check_stream_length(s, 8, "license product info::cbCompanyName"))
return FALSE;
Stream_Read_UINT32(s, productInfo->dwVersion); /* dwVersion (4 bytes) */
Stream_Read_UINT32(s, productInfo->cbCompanyName); /* cbCompanyName (4 bytes) */
/* Name must be >0, but there is no upper limit defined, use UINT32_MAX */
if ((productInfo->cbCompanyName < 2) || (productInfo->cbCompanyName % 2 != 0))
{
WLog_WARN(TAG, "license product info invalid cbCompanyName %" PRIu32,
productInfo->cbCompanyName);
return FALSE;
}
if (!license_check_stream_length(s, productInfo->cbCompanyName,
"license product info::CompanyName"))
return FALSE;
productInfo->pbProductId = NULL;
productInfo->pbCompanyName = (BYTE*)malloc(productInfo->cbCompanyName);
if (!productInfo->pbCompanyName)
goto out_fail;
Stream_Read(s, productInfo->pbCompanyName, productInfo->cbCompanyName);
if (!license_check_stream_length(s, 4, "license product info::cbProductId"))
goto out_fail;
Stream_Read_UINT32(s, productInfo->cbProductId); /* cbProductId (4 bytes) */
if ((productInfo->cbProductId < 2) || (productInfo->cbProductId % 2 != 0))
{
WLog_WARN(TAG, "license product info invalid cbProductId %" PRIu32,
productInfo->cbProductId);
goto out_fail;
}
if (!license_check_stream_length(s, productInfo->cbProductId,
"license product info::ProductId"))
goto out_fail;
productInfo->pbProductId = (BYTE*)malloc(productInfo->cbProductId);
if (!productInfo->pbProductId)
goto out_fail;
Stream_Read(s, productInfo->pbProductId, productInfo->cbProductId);
return TRUE;
out_fail:
free(productInfo->pbCompanyName);
free(productInfo->pbProductId);
productInfo->pbCompanyName = NULL;
productInfo->pbProductId = NULL;
return FALSE;
}
static BOOL license_write_product_info(wStream* s, const LICENSE_PRODUCT_INFO* productInfo)
{
WINPR_ASSERT(productInfo);
if (!license_check_stream_capacity(s, 8, "license product info::cbCompanyName"))
return FALSE;
Stream_Write_UINT32(s, productInfo->dwVersion); /* dwVersion (4 bytes) */
Stream_Write_UINT32(s, productInfo->cbCompanyName); /* cbCompanyName (4 bytes) */
/* Name must be >0, but there is no upper limit defined, use UINT32_MAX */
if ((productInfo->cbCompanyName < 2) || (productInfo->cbCompanyName % 2 != 0) ||
!productInfo->pbCompanyName)
{
WLog_WARN(TAG, "license product info invalid cbCompanyName %" PRIu32,
productInfo->cbCompanyName);
return FALSE;
}
if (!license_check_stream_capacity(s, productInfo->cbCompanyName,
"license product info::CompanyName"))
return FALSE;
Stream_Write(s, productInfo->pbCompanyName, productInfo->cbCompanyName);
if (!license_check_stream_capacity(s, 4, "license product info::cbProductId"))
return FALSE;
Stream_Write_UINT32(s, productInfo->cbProductId); /* cbProductId (4 bytes) */
if ((productInfo->cbProductId < 2) || (productInfo->cbProductId % 2 != 0) ||
!productInfo->pbProductId)
{
WLog_WARN(TAG, "license product info invalid cbProductId %" PRIu32,
productInfo->cbProductId);
return FALSE;
}
if (!license_check_stream_capacity(s, productInfo->cbProductId,
"license product info::ProductId"))
return FALSE;
Stream_Write(s, productInfo->pbProductId, productInfo->cbProductId);
return TRUE;
}
/**
* Allocate New Product Information (LICENSE_PRODUCT_INFO).
* msdn{cc241915}
* @return new product information
*/
LICENSE_PRODUCT_INFO* license_new_product_info(void)
{
LICENSE_PRODUCT_INFO* productInfo =
(LICENSE_PRODUCT_INFO*)calloc(1, sizeof(LICENSE_PRODUCT_INFO));
if (!productInfo)
return NULL;
return productInfo;
}
/**
* Free Product Information (LICENSE_PRODUCT_INFO).
* msdn{cc241915}
* @param productInfo product information
*/
void license_free_product_info(LICENSE_PRODUCT_INFO* productInfo)
{
if (productInfo)
{
free(productInfo->pbCompanyName);
free(productInfo->pbProductId);
free(productInfo);
}
}
BOOL license_read_binary_blob_data(LICENSE_BLOB* blob, UINT16 wBlobType, const void* data,
size_t length)
{
WINPR_ASSERT(blob);
WINPR_ASSERT(length <= UINT16_MAX);
WINPR_ASSERT(data || (length == 0));
blob->length = (UINT16)length;
free(blob->data);
blob->data = NULL;
if ((blob->type != wBlobType) && (blob->type != BB_ANY_BLOB))
{
WLog_ERR(TAG, "license binary blob::type expected %s, got %s",
licencse_blob_type_string(wBlobType), licencse_blob_type_string(blob->type));
}
/*
* Server can choose to not send data by setting length to 0.
* If so, it may not bother to set the type, so shortcut the warning
*/
if ((blob->type != BB_ANY_BLOB) && (blob->length == 0))
{
WLog_WARN(TAG, "license binary blob::type %s, length=0, skipping.",
licencse_blob_type_string(blob->type));
return TRUE;
}
blob->type = wBlobType;
blob->data = (BYTE*)malloc(blob->length);
if (!blob->data)
{
WLog_ERR(TAG, "license binary blob::length=%" PRIu16 ", blob::data=%p", blob->length,
blob->data);
return FALSE;
}
memcpy(blob->data, data, blob->length); /* blobData */
return TRUE;
}
/**
* Read License Binary Blob (LICENSE_BINARY_BLOB).
* msdn{cc240481}
* @param s stream
* @param blob license binary blob
*/
BOOL license_read_binary_blob(wStream* s, LICENSE_BLOB* blob)
{
UINT16 wBlobType = 0;
UINT16 length = 0;
WINPR_ASSERT(blob);
if (!license_check_stream_length(s, 4, "license binary blob::type"))
return FALSE;
Stream_Read_UINT16(s, wBlobType); /* wBlobType (2 bytes) */
Stream_Read_UINT16(s, length); /* wBlobLen (2 bytes) */
if (!license_check_stream_length(s, length, "license binary blob::length"))
return FALSE;
if (!license_read_binary_blob_data(blob, wBlobType, Stream_Pointer(s), length))
return FALSE;
return Stream_SafeSeek(s, length);
}
/**
* Write License Binary Blob (LICENSE_BINARY_BLOB).
* msdn{cc240481}
* @param s stream
* @param blob license binary blob
*/
BOOL license_write_binary_blob(wStream* s, const LICENSE_BLOB* blob)
{
WINPR_ASSERT(blob);
if (!Stream_EnsureRemainingCapacity(s, blob->length + 4))
return FALSE;
Stream_Write_UINT16(s, blob->type); /* wBlobType (2 bytes) */
Stream_Write_UINT16(s, blob->length); /* wBlobLen (2 bytes) */
if (blob->length > 0)
Stream_Write(s, blob->data, blob->length); /* blobData */
return TRUE;
}
static BOOL license_write_encrypted_premaster_secret_blob(wStream* s, const LICENSE_BLOB* blob,
UINT32 ModulusLength)
{
const UINT32 length = ModulusLength + 8;
WINPR_ASSERT(blob);
WINPR_ASSERT(length <= UINT16_MAX);
if (blob->length > ModulusLength)
{
WLog_ERR(TAG, "invalid blob");
return FALSE;
}
if (!Stream_EnsureRemainingCapacity(s, length + 4))
return FALSE;
Stream_Write_UINT16(s, blob->type); /* wBlobType (2 bytes) */
Stream_Write_UINT16(s, (UINT16)length); /* wBlobLen (2 bytes) */
if (blob->length > 0)
Stream_Write(s, blob->data, blob->length); /* blobData */
Stream_Zero(s, length - blob->length);
return TRUE;
}
static BOOL license_read_encrypted_premaster_secret_blob(wStream* s, LICENSE_BLOB* blob,
UINT32* ModulusLength)
{
if (!license_read_binary_blob(s, blob))
return FALSE;
WINPR_ASSERT(ModulusLength);
*ModulusLength = blob->length;
return TRUE;
}
/**
* Allocate New License Binary Blob (LICENSE_BINARY_BLOB).
* msdn{cc240481}
* @return new license binary blob
*/
LICENSE_BLOB* license_new_binary_blob(UINT16 type)
{
LICENSE_BLOB* blob = (LICENSE_BLOB*)calloc(1, sizeof(LICENSE_BLOB));
if (blob)
blob->type = type;
return blob;
}
/**
* Free License Binary Blob (LICENSE_BINARY_BLOB).
* msdn{cc240481}
* @param blob license binary blob
*/
void license_free_binary_blob(LICENSE_BLOB* blob)
{
if (blob)
{
free(blob->data);
free(blob);
}
}
/**
* Read License Scope List (SCOPE_LIST).
* msdn{cc241916}
* @param s stream
* @param scopeList scope list
*/
BOOL license_read_scope_list(wStream* s, SCOPE_LIST* scopeList)
{
UINT32 scopeCount = 0;
WINPR_ASSERT(scopeList);
if (!license_check_stream_length(s, 4, "license scope list"))
return FALSE;
Stream_Read_UINT32(s, scopeCount); /* ScopeCount (4 bytes) */
if (!license_check_stream_length(s, scopeCount * 4ull, "license scope list::count"))
return FALSE;
if (!license_scope_list_resize(scopeList, scopeCount))
return FALSE;
/* ScopeArray */
for (UINT32 i = 0; i < scopeCount; i++)
{
if (!license_read_binary_blob(s, scopeList->array[i]))
return FALSE;
}
return TRUE;
}
BOOL license_write_scope_list(wStream* s, const SCOPE_LIST* scopeList)
{
WINPR_ASSERT(scopeList);
if (!license_check_stream_capacity(s, 4, "license scope list"))
return FALSE;
Stream_Write_UINT32(s, scopeList->count); /* ScopeCount (4 bytes) */
if (!license_check_stream_capacity(s, scopeList->count * 4ull, "license scope list::count"))
return FALSE;
/* ScopeArray */
WINPR_ASSERT(scopeList->array || (scopeList->count == 0));
for (UINT32 i = 0; i < scopeList->count; i++)
{
const LICENSE_BLOB* element = scopeList->array[i];
if (!license_write_binary_blob(s, element))
return FALSE;
}
return TRUE;
}
/**
* Allocate New License Scope List (SCOPE_LIST).
* msdn{cc241916}
* @return new scope list
*/
SCOPE_LIST* license_new_scope_list(void)
{
SCOPE_LIST* list = calloc(1, sizeof(SCOPE_LIST));
return list;
}
BOOL license_scope_list_resize(SCOPE_LIST* scopeList, UINT32 count)
{
WINPR_ASSERT(scopeList);
WINPR_ASSERT(scopeList->array || (scopeList->count == 0));
for (UINT32 x = count; x < scopeList->count; x++)
{
license_free_binary_blob(scopeList->array[x]);
scopeList->array[x] = NULL;
}
if (count > 0)
{
LICENSE_BLOB** tmp = realloc(scopeList->array, count * sizeof(LICENSE_BLOB*));
if (!tmp)
return FALSE;
scopeList->array = tmp;
}
else
{
free(scopeList->array);
scopeList->array = NULL;
}
for (UINT32 x = scopeList->count; x < count; x++)
{
LICENSE_BLOB* blob = license_new_binary_blob(BB_SCOPE_BLOB);
if (!blob)
{
scopeList->count = x;
return FALSE;
}
scopeList->array[x] = blob;
}
scopeList->count = count;
return TRUE;
}
/**
* Free License Scope List (SCOPE_LIST).
* msdn{cc241916}
* @param scopeList scope list
*/
void license_free_scope_list(SCOPE_LIST* scopeList)
{
if (!scopeList)
return;
license_scope_list_resize(scopeList, 0);
free(scopeList);
}
BOOL license_send_license_info(rdpLicense* license, const LICENSE_BLOB* calBlob,
const BYTE* signature, size_t signature_length)
{
wStream* s = license_send_stream_init(license);
WINPR_ASSERT(calBlob);
WINPR_ASSERT(signature);
WINPR_ASSERT(license->certificate);
const rdpCertInfo* info = freerdp_certificate_get_info(license->certificate);
if (!s)
return FALSE;
if (!license_check_stream_capacity(s, 8 + sizeof(license->ClientRandom),
"license info::ClientRandom"))
return FALSE;
Stream_Write_UINT32(s,
license->PreferredKeyExchangeAlg); /* PreferredKeyExchangeAlg (4 bytes) */
Stream_Write_UINT32(s, license->PlatformId); /* PlatformId (4 bytes) */
/* ClientRandom (32 bytes) */
Stream_Write(s, license->ClientRandom, sizeof(license->ClientRandom));
/* Licensing Binary Blob with EncryptedPreMasterSecret: */
if (!license_write_encrypted_premaster_secret_blob(s, license->EncryptedPremasterSecret,
info->ModulusLength))
goto error;
/* Licensing Binary Blob with LicenseInfo: */
if (!license_write_binary_blob(s, calBlob))
goto error;
/* Licensing Binary Blob with EncryptedHWID */
if (!license_write_binary_blob(s, license->EncryptedHardwareId))
goto error;
/* MACData */
if (!license_check_stream_capacity(s, signature_length, "license info::MACData"))
goto error;
Stream_Write(s, signature, signature_length);
return license_send(license, s, LICENSE_INFO);
error:
Stream_Release(s);
return FALSE;
}
static BOOL license_check_preferred_alg(rdpLicense* license, UINT32 PreferredKeyExchangeAlg,
const char* where)
{
WINPR_ASSERT(license);
WINPR_ASSERT(where);
if (license->PreferredKeyExchangeAlg != PreferredKeyExchangeAlg)
{
char buffer1[64] = { 0 };
char buffer2[64] = { 0 };
WLog_WARN(TAG, "%s::PreferredKeyExchangeAlg, expected %s, got %s", where,
license_preferred_key_exchange_alg_string(license->PreferredKeyExchangeAlg,
buffer1, sizeof(buffer1)),
license_preferred_key_exchange_alg_string(PreferredKeyExchangeAlg, buffer2,
sizeof(buffer2)));
return FALSE;
}
return TRUE;
}
BOOL license_read_license_info(rdpLicense* license, wStream* s)
{
BOOL rc = FALSE;
UINT32 PreferredKeyExchangeAlg = 0;
WINPR_ASSERT(license);
WINPR_ASSERT(license->certificate);
const rdpCertInfo* info = freerdp_certificate_get_info(license->certificate);
if (!info)
goto error;
/* ClientRandom (32 bytes) */
if (!license_check_stream_length(s, 8 + sizeof(license->ClientRandom), "license info"))
goto error;
Stream_Read_UINT32(s, PreferredKeyExchangeAlg); /* PreferredKeyExchangeAlg (4 bytes) */
if (!license_check_preferred_alg(license, PreferredKeyExchangeAlg, "license info"))
goto error;
Stream_Read_UINT32(s, license->PlatformId); /* PlatformId (4 bytes) */
/* ClientRandom (32 bytes) */
Stream_Read(s, license->ClientRandom, sizeof(license->ClientRandom));
/* Licensing Binary Blob with EncryptedPreMasterSecret: */
UINT32 ModulusLength = 0;
if (!license_read_encrypted_premaster_secret_blob(s, license->EncryptedPremasterSecret,
&ModulusLength))
goto error;
if (ModulusLength != info->ModulusLength)
{
WLog_WARN(TAG,
"EncryptedPremasterSecret,::ModulusLength[%" PRIu32
"] != rdpCertInfo::ModulusLength[%" PRIu32 "]",
ModulusLength, info->ModulusLength);
goto error;
}
/* Licensing Binary Blob with LicenseInfo: */
if (!license_read_binary_blob(s, license->LicenseInfo))
goto error;
/* Licensing Binary Blob with EncryptedHWID */
if (!license_read_binary_blob(s, license->EncryptedHardwareId))
goto error;
/* MACData */
if (!license_check_stream_length(s, sizeof(license->MACData), "license info::MACData"))
goto error;
Stream_Read(s, license->MACData, sizeof(license->MACData));
rc = TRUE;
error:
return rc;
}
/**
* Read a LICENSE_REQUEST packet.
* msdn{cc241914}
* @param license license module
* @param s stream
*/
BOOL license_read_license_request_packet(rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
/* ServerRandom (32 bytes) */
if (!license_check_stream_length(s, sizeof(license->ServerRandom), "license request"))
return FALSE;
Stream_Read(s, license->ServerRandom, sizeof(license->ServerRandom));
/* ProductInfo */
if (!license_read_product_info(s, license->ProductInfo))
return FALSE;
/* KeyExchangeList */
if (!license_read_binary_blob(s, license->KeyExchangeList))
return FALSE;
/* ServerCertificate */
if (!license_read_binary_blob(s, license->ServerCertificate))
return FALSE;
/* ScopeList */
if (!license_read_scope_list(s, license->ScopeList))
return FALSE;
/* Parse Server Certificate */
if (!freerdp_certificate_read_server_cert(license->certificate,
license->ServerCertificate->data,
license->ServerCertificate->length))
return FALSE;
if (!license_generate_keys(license) || !license_generate_hwid(license) ||
!license_encrypt_premaster_secret(license))
return FALSE;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "ServerRandom:");
winpr_HexDump(TAG, WLOG_DEBUG, license->ServerRandom, sizeof(license->ServerRandom));
license_print_product_info(license->ProductInfo);
license_print_scope_list(license->ScopeList);
#endif
return TRUE;
}
BOOL license_write_license_request_packet(const rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
/* ServerRandom (32 bytes) */
if (!license_check_stream_capacity(s, sizeof(license->ServerRandom), "license request"))
return FALSE;
Stream_Write(s, license->ServerRandom, sizeof(license->ServerRandom));
/* ProductInfo */
if (!license_write_product_info(s, license->ProductInfo))
return FALSE;
/* KeyExchangeList */
if (!license_write_binary_blob(s, license->KeyExchangeList))
return FALSE;
/* ServerCertificate */
if (!license_write_binary_blob(s, license->ServerCertificate))
return FALSE;
/* ScopeList */
if (!license_write_scope_list(s, license->ScopeList))
return FALSE;
return TRUE;
}
static BOOL license_send_license_request_packet(rdpLicense* license)
{
wStream* s = license_send_stream_init(license);
if (!s)
return FALSE;
if (!license_write_license_request_packet(license, s))
goto fail;
return license_send(license, s, LICENSE_REQUEST);
fail:
Stream_Release(s);
return FALSE;
}
/*
* Read a PLATFORM_CHALLENGE packet.
* msdn{cc241921}
* @param license license module
* @param s stream
*/
BOOL license_read_platform_challenge_packet(rdpLicense* license, wStream* s)
{
BYTE macData[LICENSING_ENCRYPTION_KEY_LENGTH] = { 0 };
UINT32 ConnectFlags = 0;
WINPR_ASSERT(license);
DEBUG_LICENSE("Receiving Platform Challenge Packet");
if (!license_check_stream_length(s, 4, "license platform challenge"))
return FALSE;
Stream_Read_UINT32(s, ConnectFlags); /* ConnectFlags, Reserved (4 bytes) */
/* EncryptedPlatformChallenge */
license->EncryptedPlatformChallenge->type = BB_ANY_BLOB;
if (!license_read_binary_blob(s, license->EncryptedPlatformChallenge))
return FALSE;
license->EncryptedPlatformChallenge->type = BB_ENCRYPTED_DATA_BLOB;
/* MACData (16 bytes) */
if (!license_check_stream_length(s, sizeof(macData), "license platform challenge::MAC"))
return FALSE;
Stream_Read(s, macData, sizeof(macData));
if (!license_decrypt_and_check_MAC(license, license->EncryptedPlatformChallenge->data,
license->EncryptedPlatformChallenge->length,
license->PlatformChallenge, macData))
return FALSE;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "ConnectFlags: 0x%08" PRIX32 "", ConnectFlags);
WLog_DBG(TAG, "EncryptedPlatformChallenge:");
winpr_HexDump(TAG, WLOG_DEBUG, license->EncryptedPlatformChallenge->data,
license->EncryptedPlatformChallenge->length);
WLog_DBG(TAG, "PlatformChallenge:");
winpr_HexDump(TAG, WLOG_DEBUG, license->PlatformChallenge->data,
license->PlatformChallenge->length);
WLog_DBG(TAG, "MacData:");
winpr_HexDump(TAG, WLOG_DEBUG, macData, sizeof(macData));
#endif
return TRUE;
}
BOOL license_send_error_alert(rdpLicense* license, UINT32 dwErrorCode, UINT32 dwStateTransition,
const LICENSE_BLOB* info)
{
wStream* s = license_send_stream_init(license);
if (!s)
goto fail;
if (!license_check_stream_capacity(s, 8, "license error alert"))
goto fail;
Stream_Write_UINT32(s, dwErrorCode);
Stream_Write_UINT32(s, dwStateTransition);
if (info)
{
if (!license_write_binary_blob(s, info))
goto fail;
}
return license_send(license, s, ERROR_ALERT);
fail:
Stream_Release(s);
return FALSE;
}
BOOL license_send_platform_challenge_packet(rdpLicense* license)
{
wStream* s = license_send_stream_init(license);
if (!s)
goto fail;
DEBUG_LICENSE("Receiving Platform Challenge Packet");
if (!license_check_stream_capacity(s, 4, "license platform challenge"))
goto fail;
Stream_Zero(s, 4); /* ConnectFlags, Reserved (4 bytes) */
/* EncryptedPlatformChallenge */
if (!license_write_binary_blob(s, license->EncryptedPlatformChallenge))
goto fail;
/* MACData (16 bytes) */
if (!license_check_stream_length(s, sizeof(license->MACData),
"license platform challenge::MAC"))
goto fail;
Stream_Write(s, license->MACData, sizeof(license->MACData));
return license_send(license, s, PLATFORM_CHALLENGE);
fail:
Stream_Release(s);
return FALSE;
}
static BOOL license_read_encrypted_blob(const rdpLicense* license, wStream* s, LICENSE_BLOB* target)
{
UINT16 wBlobType = 0;
UINT16 wBlobLen = 0;
WINPR_ASSERT(license);
WINPR_ASSERT(target);
if (!license_check_stream_length(s, 4, "license encrypted blob"))
return FALSE;
Stream_Read_UINT16(s, wBlobType);
if (wBlobType != BB_ENCRYPTED_DATA_BLOB)
{
WLog_WARN(
TAG,
"expecting BB_ENCRYPTED_DATA_BLOB blob, probably a windows 2003 server, continuing...");
}
Stream_Read_UINT16(s, wBlobLen);
BYTE* encryptedData = Stream_Pointer(s);
if (!Stream_SafeSeek(s, wBlobLen))
{
WLog_WARN(TAG,
"short license encrypted blob::length, expected %" PRIu16 " bytes, got %" PRIuz,
wBlobLen, Stream_GetRemainingLength(s));
return FALSE;
}
return license_rc4_with_licenseKey(license, encryptedData, wBlobLen, target);
}
/**
* Read a NEW_LICENSE packet.
* msdn{cc241926}
* @param license license module
* @param s stream
*/
BOOL license_read_new_or_upgrade_license_packet(rdpLicense* license, wStream* s)
{
UINT32 os_major = 0;
UINT32 os_minor = 0;
UINT32 cbScope = 0;
UINT32 cbCompanyName = 0;
UINT32 cbProductId = 0;
UINT32 cbLicenseInfo = 0;
wStream sbuffer = { 0 };
wStream* licenseStream = NULL;
BOOL ret = FALSE;
BYTE computedMac[16] = { 0 };
const BYTE* readMac = NULL;
WINPR_ASSERT(license);
DEBUG_LICENSE("Receiving Server New/Upgrade License Packet");
LICENSE_BLOB* calBlob = license_new_binary_blob(BB_DATA_BLOB);
if (!calBlob)
return FALSE;
/* EncryptedLicenseInfo */
if (!license_read_encrypted_blob(license, s, calBlob))
goto fail;
/* compute MAC and check it */
readMac = Stream_Pointer(s);
if (!Stream_SafeSeek(s, sizeof(computedMac)))
{
WLog_WARN(TAG, "short license new/upgrade, expected 16 bytes, got %" PRIuz,
Stream_GetRemainingLength(s));
goto fail;
}
if (!security_mac_data(license->MacSaltKey, sizeof(license->MacSaltKey), calBlob->data,
calBlob->length, computedMac, sizeof(computedMac)))
goto fail;
if (memcmp(computedMac, readMac, sizeof(computedMac)) != 0)
{
WLog_ERR(TAG, "new or upgrade license MAC mismatch");
goto fail;
}
licenseStream = Stream_StaticConstInit(&sbuffer, calBlob->data, calBlob->length);
if (!licenseStream)
{
WLog_ERR(TAG, "license::blob::data=%p, license::blob::length=%" PRIu16, calBlob->data,
calBlob->length);
goto fail;
}
if (!license_check_stream_length(licenseStream, 8, "license new/upgrade::blob::version"))
goto fail;
Stream_Read_UINT16(licenseStream, os_minor);
Stream_Read_UINT16(licenseStream, os_major);
WLog_DBG(TAG, "Version: %" PRIu16 ".%" PRIu16, os_major, os_minor);
/* Scope */
Stream_Read_UINT32(licenseStream, cbScope);
if (!license_check_stream_length(licenseStream, cbScope, "license new/upgrade::blob::scope"))
goto fail;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "Scope:");
winpr_HexDump(TAG, WLOG_DEBUG, Stream_Pointer(licenseStream), cbScope);
#endif
Stream_Seek(licenseStream, cbScope);
/* CompanyName */
if (!license_check_stream_length(licenseStream, 4, "license new/upgrade::blob::cbCompanyName"))
goto fail;
Stream_Read_UINT32(licenseStream, cbCompanyName);
if (!license_check_stream_length(licenseStream, cbCompanyName,
"license new/upgrade::blob::CompanyName"))
goto fail;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "Company name:");
winpr_HexDump(TAG, WLOG_DEBUG, Stream_Pointer(licenseStream), cbCompanyName);
#endif
Stream_Seek(licenseStream, cbCompanyName);
/* productId */
if (!license_check_stream_length(licenseStream, 4, "license new/upgrade::blob::cbProductId"))
goto fail;
Stream_Read_UINT32(licenseStream, cbProductId);
if (!license_check_stream_length(licenseStream, cbProductId,
"license new/upgrade::blob::ProductId"))
goto fail;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "Product id:");
winpr_HexDump(TAG, WLOG_DEBUG, Stream_Pointer(licenseStream), cbProductId);
#endif
Stream_Seek(licenseStream, cbProductId);
/* licenseInfo */
if (!license_check_stream_length(licenseStream, 4, "license new/upgrade::blob::cbLicenseInfo"))
goto fail;
Stream_Read_UINT32(licenseStream, cbLicenseInfo);
if (!license_check_stream_length(licenseStream, cbLicenseInfo,
"license new/upgrade::blob::LicenseInfo"))
goto fail;
license->type = LICENSE_TYPE_ISSUED;
ret = license_set_state(license, LICENSE_STATE_COMPLETED);
if (!license->rdp->settings->OldLicenseBehaviour)
ret = saveCal(license->rdp->settings, Stream_Pointer(licenseStream), cbLicenseInfo,
license->rdp->settings->ClientHostname);
fail:
license_free_binary_blob(calBlob);
return ret;
}
/**
* Read an ERROR_ALERT packet.
* msdn{cc240482}
* @param license license module
* @param s stream
*/
BOOL license_read_error_alert_packet(rdpLicense* license, wStream* s)
{
UINT32 dwErrorCode = 0;
UINT32 dwStateTransition = 0;
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
if (!license_check_stream_length(s, 8ul, "error alert"))
return FALSE;
Stream_Read_UINT32(s, dwErrorCode); /* dwErrorCode (4 bytes) */
Stream_Read_UINT32(s, dwStateTransition); /* dwStateTransition (4 bytes) */
if (!license_read_binary_blob(s, license->ErrorInfo)) /* bbErrorInfo */
return FALSE;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "dwErrorCode: %s, dwStateTransition: %s", error_codes[dwErrorCode],
state_transitions[dwStateTransition]);
#endif
if (dwErrorCode == STATUS_VALID_CLIENT)
{
license->type = LICENSE_TYPE_NONE;
return license_set_state(license, LICENSE_STATE_COMPLETED);
}
switch (dwStateTransition)
{
case ST_TOTAL_ABORT:
license_set_state(license, LICENSE_STATE_ABORTED);
break;
case ST_NO_TRANSITION:
license_set_state(license, LICENSE_STATE_COMPLETED);
break;
case ST_RESET_PHASE_TO_START:
license_set_state(license, LICENSE_STATE_CONFIGURED);
break;
case ST_RESEND_LAST_MESSAGE:
break;
default:
break;
}
return TRUE;
}
/**
* Write a NEW_LICENSE_REQUEST packet.
* msdn{cc241918}
* @param license license module
* @param s stream
*/
BOOL license_write_new_license_request_packet(const rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
const rdpCertInfo* info = freerdp_certificate_get_info(license->certificate);
if (!info)
return FALSE;
if (!license_check_stream_capacity(s, 8 + sizeof(license->ClientRandom), "License Request"))
return FALSE;
Stream_Write_UINT32(s,
license->PreferredKeyExchangeAlg); /* PreferredKeyExchangeAlg (4 bytes) */
Stream_Write_UINT32(s, license->PlatformId); /* PlatformId (4 bytes) */
Stream_Write(s, license->ClientRandom,
sizeof(license->ClientRandom)); /* ClientRandom (32 bytes) */
if (/* EncryptedPremasterSecret */
!license_write_encrypted_premaster_secret_blob(s, license->EncryptedPremasterSecret,
info->ModulusLength) ||
/* ClientUserName */
!license_write_binary_blob(s, license->ClientUserName) ||
/* ClientMachineName */
!license_write_binary_blob(s, license->ClientMachineName))
{
return FALSE;
}
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "PreferredKeyExchangeAlg: 0x%08" PRIX32 "", license->PreferredKeyExchangeAlg);
WLog_DBG(TAG, "ClientRandom:");
winpr_HexDump(TAG, WLOG_DEBUG, license->ClientRandom, sizeof(license->ClientRandom));
WLog_DBG(TAG, "EncryptedPremasterSecret");
winpr_HexDump(TAG, WLOG_DEBUG, license->EncryptedPremasterSecret->data,
license->EncryptedPremasterSecret->length);
WLog_DBG(TAG, "ClientUserName (%" PRIu16 "): %s", license->ClientUserName->length,
(char*)license->ClientUserName->data);
WLog_DBG(TAG, "ClientMachineName (%" PRIu16 "): %s", license->ClientMachineName->length,
(char*)license->ClientMachineName->data);
#endif
return TRUE;
}
BOOL license_read_new_license_request_packet(rdpLicense* license, wStream* s)
{
UINT32 PreferredKeyExchangeAlg = 0;
WINPR_ASSERT(license);
if (!license_check_stream_length(s, 8ull + sizeof(license->ClientRandom),
"new license request"))
return FALSE;
Stream_Read_UINT32(s, PreferredKeyExchangeAlg); /* PreferredKeyExchangeAlg (4 bytes) */
if (!license_check_preferred_alg(license, PreferredKeyExchangeAlg, "new license request"))
return FALSE;
Stream_Read_UINT32(s, license->PlatformId); /* PlatformId (4 bytes) */
Stream_Read(s, license->ClientRandom,
sizeof(license->ClientRandom)); /* ClientRandom (32 bytes) */
/* EncryptedPremasterSecret */
UINT32 ModulusLength = 0;
if (!license_read_encrypted_premaster_secret_blob(s, license->EncryptedPremasterSecret,
&ModulusLength))
return FALSE;
const rdpCertInfo* info = freerdp_certificate_get_info(license->certificate);
if (!info)
WLog_WARN(TAG, "Missing license certificate, skipping ModulusLength checks");
else if (ModulusLength != info->ModulusLength)
{
WLog_WARN(TAG,
"EncryptedPremasterSecret expected to be %" PRIu32 " bytes, but read %" PRIu32
" bytes",
info->ModulusLength, ModulusLength);
return FALSE;
}
/* ClientUserName */
if (!license_read_binary_blob(s, license->ClientUserName))
return FALSE;
/* ClientMachineName */
if (!license_read_binary_blob(s, license->ClientMachineName))
return FALSE;
return TRUE;
}
/**
* Send a NEW_LICENSE_REQUEST packet.
* msdn{cc241918}
* @param license license module
*/
BOOL license_answer_license_request(rdpLicense* license)
{
wStream* s = NULL;
BYTE* license_data = NULL;
size_t license_size = 0;
BOOL status = 0;
char* username = NULL;
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
WINPR_ASSERT(license->rdp->settings);
if (!license->rdp->settings->OldLicenseBehaviour)
license_data = loadCalFile(license->rdp->settings, license->rdp->settings->ClientHostname,
&license_size);
if (license_data)
{
LICENSE_BLOB* calBlob = NULL;
BYTE signature[LICENSING_ENCRYPTION_KEY_LENGTH] = { 0 };
DEBUG_LICENSE("Sending Saved License Packet");
WINPR_ASSERT(license->EncryptedHardwareId);
license->EncryptedHardwareId->type = BB_ENCRYPTED_DATA_BLOB;
if (!license_encrypt_and_MAC(license, license->HardwareId, sizeof(license->HardwareId),
license->EncryptedHardwareId, signature, sizeof(signature)))
{
free(license_data);
return FALSE;
}
calBlob = license_new_binary_blob(BB_DATA_BLOB);
if (!calBlob)
{
free(license_data);
return FALSE;
}
calBlob->data = license_data;
WINPR_ASSERT(license_size <= UINT16_MAX);
calBlob->length = (UINT16)license_size;
status = license_send_license_info(license, calBlob, signature, sizeof(signature));
license_free_binary_blob(calBlob);
return status;
}
DEBUG_LICENSE("Sending New License Packet");
s = license_send_stream_init(license);
if (!s)
return FALSE;
if (license->rdp->settings->Username != NULL)
username = license->rdp->settings->Username;
else
username = "username";
{
WINPR_ASSERT(license->ClientUserName);
const size_t len = strlen(username) + 1;
WINPR_ASSERT(len <= UINT16_MAX);
license->ClientUserName->data = (BYTE*)username;
license->ClientUserName->length = (UINT16)len;
}
{
WINPR_ASSERT(license->ClientMachineName);
const size_t len = strlen(license->rdp->settings->ClientHostname) + 1;
WINPR_ASSERT(len <= UINT16_MAX);
license->ClientMachineName->data = (BYTE*)license->rdp->settings->ClientHostname;
license->ClientMachineName->length = (UINT16)len;
}
status = license_write_new_license_request_packet(license, s);
WINPR_ASSERT(license->ClientUserName);
license->ClientUserName->data = NULL;
license->ClientUserName->length = 0;
WINPR_ASSERT(license->ClientMachineName);
license->ClientMachineName->data = NULL;
license->ClientMachineName->length = 0;
if (!status)
{
Stream_Release(s);
return FALSE;
}
return license_send(license, s, NEW_LICENSE_REQUEST);
}
/**
* Send Client Challenge Response Packet.
* msdn{cc241922}
* @param license license module
*/
BOOL license_send_platform_challenge_response(rdpLicense* license)
{
wStream* s = license_send_stream_init(license);
wStream* challengeRespData = NULL;
BYTE* buffer = NULL;
BOOL status = 0;
WINPR_ASSERT(license);
WINPR_ASSERT(license->PlatformChallenge);
WINPR_ASSERT(license->MacSaltKey);
WINPR_ASSERT(license->EncryptedPlatformChallenge);
WINPR_ASSERT(license->EncryptedHardwareId);
DEBUG_LICENSE("Sending Platform Challenge Response Packet");
license->EncryptedPlatformChallenge->type = BB_DATA_BLOB;
/* prepare the PLATFORM_CHALLENGE_RESPONSE_DATA */
challengeRespData = Stream_New(NULL, 8 + license->PlatformChallenge->length);
if (!challengeRespData)
return FALSE;
Stream_Write_UINT16(challengeRespData, PLATFORM_CHALLENGE_RESPONSE_VERSION); /* wVersion */
Stream_Write_UINT16(challengeRespData, license->ClientType); /* wClientType */
Stream_Write_UINT16(challengeRespData, license->LicenseDetailLevel); /* wLicenseDetailLevel */
Stream_Write_UINT16(challengeRespData, license->PlatformChallenge->length); /* cbChallenge */
Stream_Write(challengeRespData, license->PlatformChallenge->data,
license->PlatformChallenge->length); /* pbChallenge */
Stream_SealLength(challengeRespData);
/* compute MAC of PLATFORM_CHALLENGE_RESPONSE_DATA + HWID */
const size_t length = Stream_Length(challengeRespData) + sizeof(license->HardwareId);
buffer = (BYTE*)malloc(length);
if (!buffer)
{
Stream_Free(challengeRespData, TRUE);
return FALSE;
}
CopyMemory(buffer, Stream_Buffer(challengeRespData), Stream_Length(challengeRespData));
CopyMemory(&buffer[Stream_Length(challengeRespData)], license->HardwareId,
sizeof(license->HardwareId));
status = security_mac_data(license->MacSaltKey, sizeof(license->MacSaltKey), buffer, length,
license->MACData, sizeof(license->MACData));
free(buffer);
if (!status)
{
Stream_Free(challengeRespData, TRUE);
return FALSE;
}
license->EncryptedHardwareId->type = BB_ENCRYPTED_DATA_BLOB;
if (!license_rc4_with_licenseKey(license, license->HardwareId, sizeof(license->HardwareId),
license->EncryptedHardwareId))
{
Stream_Free(challengeRespData, TRUE);
return FALSE;
}
status = license_rc4_with_licenseKey(license, Stream_Buffer(challengeRespData),
Stream_Length(challengeRespData),
license->EncryptedPlatformChallengeResponse);
Stream_Free(challengeRespData, TRUE);
if (!status)
return FALSE;
#ifdef WITH_DEBUG_LICENSE
WLog_DBG(TAG, "LicensingEncryptionKey:");
winpr_HexDump(TAG, WLOG_DEBUG, license->LicensingEncryptionKey, 16);
WLog_DBG(TAG, "HardwareId:");
winpr_HexDump(TAG, WLOG_DEBUG, license->HardwareId, sizeof(license->HardwareId));
WLog_DBG(TAG, "EncryptedHardwareId:");
winpr_HexDump(TAG, WLOG_DEBUG, license->EncryptedHardwareId->data,
license->EncryptedHardwareId->length);
#endif
if (license_write_client_platform_challenge_response(license, s))
return license_send(license, s, PLATFORM_CHALLENGE_RESPONSE);
Stream_Release(s);
return FALSE;
}
BOOL license_read_platform_challenge_response(rdpLicense* license, wStream* s)
{
UINT16 wVersion = 0;
UINT16 cbChallenge = 0;
const BYTE* pbChallenge = NULL;
WINPR_ASSERT(license);
WINPR_ASSERT(license->PlatformChallenge);
WINPR_ASSERT(license->MacSaltKey);
WINPR_ASSERT(license->EncryptedPlatformChallenge);
WINPR_ASSERT(license->EncryptedHardwareId);
DEBUG_LICENSE("Receiving Platform Challenge Response Packet");
if (!license_check_stream_length(s, 8, "PLATFORM_CHALLENGE_RESPONSE_DATA"))
return FALSE;
Stream_Read_UINT16(s, wVersion);
if (wVersion != PLATFORM_CHALLENGE_RESPONSE_VERSION)
{
WLog_WARN(TAG,
"Invalid PLATFORM_CHALLENGE_RESPONSE_DATA::wVersion 0x%04" PRIx16
", expected 0x04" PRIx16,
wVersion, PLATFORM_CHALLENGE_RESPONSE_VERSION);
return FALSE;
}
Stream_Read_UINT16(s, license->ClientType);
Stream_Read_UINT16(s, license->LicenseDetailLevel);
Stream_Read_UINT16(s, cbChallenge);
if (!license_check_stream_length(s, cbChallenge,
"PLATFORM_CHALLENGE_RESPONSE_DATA::pbChallenge"))
return FALSE;
pbChallenge = Stream_Pointer(s);
if (!license_read_binary_blob_data(license->EncryptedPlatformChallengeResponse, BB_DATA_BLOB,
pbChallenge, cbChallenge))
return FALSE;
return Stream_SafeSeek(s, cbChallenge);
}
BOOL license_write_client_platform_challenge_response(rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
if (!license_write_binary_blob(s, license->EncryptedPlatformChallengeResponse))
return FALSE;
if (!license_write_binary_blob(s, license->EncryptedHardwareId))
return FALSE;
if (!license_check_stream_capacity(s, sizeof(license->MACData),
"CLIENT_PLATFORM_CHALLENGE_RESPONSE::MACData"))
return FALSE;
Stream_Write(s, license->MACData, sizeof(license->MACData));
return TRUE;
}
BOOL license_read_client_platform_challenge_response(rdpLicense* license, wStream* s)
{
WINPR_ASSERT(license);
if (!license_read_binary_blob(s, license->EncryptedPlatformChallengeResponse))
return FALSE;
if (!license_read_binary_blob(s, license->EncryptedHardwareId))
return FALSE;
if (!license_check_stream_length(s, sizeof(license->MACData),
"CLIENT_PLATFORM_CHALLENGE_RESPONSE::MACData"))
return FALSE;
Stream_Read(s, license->MACData, sizeof(license->MACData));
return TRUE;
}
/**
* Send Server License Error - Valid Client Packet.
* msdn{cc241922}
*
* @param rdp A pointer to the context to use
*
* @return \b TRUE for success, \b FALSE otherwise
*/
BOOL license_send_valid_client_error_packet(rdpRdp* rdp)
{
WINPR_ASSERT(rdp);
rdpLicense* license = rdp->license;
WINPR_ASSERT(license);
license->state = LICENSE_STATE_COMPLETED;
license->type = LICENSE_TYPE_NONE;
return license_send_error_alert(license, STATUS_VALID_CLIENT, ST_NO_TRANSITION,
license->ErrorInfo);
}
/**
* Instantiate new license module.
* @param rdp RDP module
* @return new license module
*/
rdpLicense* license_new(rdpRdp* rdp)
{
rdpLicense* license = NULL;
WINPR_ASSERT(rdp);
license = (rdpLicense*)calloc(1, sizeof(rdpLicense));
if (!license)
return NULL;
license->PlatformId = PLATFORMID;
license->ClientType = OTHER_PLATFORM_CHALLENGE_TYPE;
license->LicenseDetailLevel = LICENSE_DETAIL_DETAIL;
license->PreferredKeyExchangeAlg = KEY_EXCHANGE_ALG_RSA;
license->rdp = rdp;
license_set_state(license, LICENSE_STATE_INITIAL);
if (!(license->certificate = freerdp_certificate_new()))
goto out_error;
if (!(license->ProductInfo = license_new_product_info()))
goto out_error;
if (!(license->ErrorInfo = license_new_binary_blob(BB_ERROR_BLOB)))
goto out_error;
if (!(license->LicenseInfo = license_new_binary_blob(BB_DATA_BLOB)))
goto out_error;
if (!(license->KeyExchangeList = license_new_binary_blob(BB_KEY_EXCHG_ALG_BLOB)))
goto out_error;
if (!(license->ServerCertificate = license_new_binary_blob(BB_CERTIFICATE_BLOB)))
goto out_error;
if (!(license->ClientUserName = license_new_binary_blob(BB_CLIENT_USER_NAME_BLOB)))
goto out_error;
if (!(license->ClientMachineName = license_new_binary_blob(BB_CLIENT_MACHINE_NAME_BLOB)))
goto out_error;
if (!(license->PlatformChallenge = license_new_binary_blob(BB_ANY_BLOB)))
goto out_error;
if (!(license->EncryptedPlatformChallenge = license_new_binary_blob(BB_ANY_BLOB)))
goto out_error;
if (!(license->EncryptedPlatformChallengeResponse =
license_new_binary_blob(BB_ENCRYPTED_DATA_BLOB)))
goto out_error;
if (!(license->EncryptedPremasterSecret = license_new_binary_blob(BB_ANY_BLOB)))
goto out_error;
if (!(license->EncryptedHardwareId = license_new_binary_blob(BB_ENCRYPTED_DATA_BLOB)))
goto out_error;
if (!(license->EncryptedLicenseInfo = license_new_binary_blob(BB_ENCRYPTED_DATA_BLOB)))
goto out_error;
if (!(license->ScopeList = license_new_scope_list()))
goto out_error;
license_generate_randoms(license);
return license;
out_error:
WINPR_PRAGMA_DIAG_PUSH
WINPR_PRAGMA_DIAG_IGNORED_MISMATCHED_DEALLOC
license_free(license);
WINPR_PRAGMA_DIAG_POP
return NULL;
}
/**
* Free license module.
* @param license license module to be freed
*/
void license_free(rdpLicense* license)
{
if (license)
{
freerdp_certificate_free(license->certificate);
license_free_product_info(license->ProductInfo);
license_free_binary_blob(license->ErrorInfo);
license_free_binary_blob(license->LicenseInfo);
license_free_binary_blob(license->KeyExchangeList);
license_free_binary_blob(license->ServerCertificate);
license_free_binary_blob(license->ClientUserName);
license_free_binary_blob(license->ClientMachineName);
license_free_binary_blob(license->PlatformChallenge);
license_free_binary_blob(license->EncryptedPlatformChallenge);
license_free_binary_blob(license->EncryptedPlatformChallengeResponse);
license_free_binary_blob(license->EncryptedPremasterSecret);
license_free_binary_blob(license->EncryptedHardwareId);
license_free_binary_blob(license->EncryptedLicenseInfo);
license_free_scope_list(license->ScopeList);
free(license);
}
}
LICENSE_STATE license_get_state(const rdpLicense* license)
{
WINPR_ASSERT(license);
return license->state;
}
LICENSE_TYPE license_get_type(const rdpLicense* license)
{
WINPR_ASSERT(license);
return license->type;
}
BOOL license_set_state(rdpLicense* license, LICENSE_STATE state)
{
WINPR_ASSERT(license);
license->state = state;
switch (state)
{
case LICENSE_STATE_COMPLETED:
break;
case LICENSE_STATE_ABORTED:
default:
license->type = LICENSE_TYPE_INVALID;
break;
}
return TRUE;
}
const char* license_get_state_string(LICENSE_STATE state)
{
switch (state)
{
case LICENSE_STATE_INITIAL:
return "LICENSE_STATE_INITIAL";
case LICENSE_STATE_CONFIGURED:
return "LICENSE_STATE_CONFIGURED";
case LICENSE_STATE_REQUEST:
return "LICENSE_STATE_REQUEST";
case LICENSE_STATE_NEW_REQUEST:
return "LICENSE_STATE_NEW_REQUEST";
case LICENSE_STATE_PLATFORM_CHALLENGE:
return "LICENSE_STATE_PLATFORM_CHALLENGE";
case LICENSE_STATE_PLATFORM_CHALLENGE_RESPONSE:
return "LICENSE_STATE_PLATFORM_CHALLENGE_RESPONSE";
case LICENSE_STATE_COMPLETED:
return "LICENSE_STATE_COMPLETED";
case LICENSE_STATE_ABORTED:
return "LICENSE_STATE_ABORTED";
default:
return "LICENSE_STATE_UNKNOWN";
}
}
BOOL license_server_send_request(rdpLicense* license)
{
if (!license_ensure_state(license, LICENSE_STATE_CONFIGURED, LICENSE_REQUEST))
return FALSE;
if (!license_send_license_request_packet(license))
return FALSE;
return license_set_state(license, LICENSE_STATE_REQUEST);
}
static BOOL license_set_string(const char* what, const char* value, BYTE** bdst, UINT32* dstLen)
{
WINPR_ASSERT(what);
WINPR_ASSERT(value);
WINPR_ASSERT(bdst);
WINPR_ASSERT(dstLen);
union
{
WCHAR** w;
BYTE** b;
} cnv;
cnv.b = bdst;
size_t len = 0;
*cnv.w = ConvertUtf8ToWCharAlloc(value, &len);
if (!*cnv.w || (len > UINT32_MAX / sizeof(WCHAR)))
{
WLog_ERR(TAG, "license->ProductInfo: %s == %p || %" PRIu32 " > UINT32_MAX", what, *cnv.w,
len);
return FALSE;
}
*dstLen = (UINT32)(len * sizeof(WCHAR));
return TRUE;
}
BOOL license_server_configure(rdpLicense* license)
{
wStream* s = NULL;
UINT32 algs[] = { KEY_EXCHANGE_ALG_RSA };
WINPR_ASSERT(license);
WINPR_ASSERT(license->rdp);
const rdpSettings* settings = license->rdp->settings;
const char* CompanyName =
freerdp_settings_get_string(settings, FreeRDP_ServerLicenseCompanyName);
const char* ProductName =
freerdp_settings_get_string(settings, FreeRDP_ServerLicenseProductName);
const UINT32 ProductVersion =
freerdp_settings_get_uint32(settings, FreeRDP_ServerLicenseProductVersion);
const UINT32 issuerCount =
freerdp_settings_get_uint32(settings, FreeRDP_ServerLicenseProductIssuersCount);
const char* const* issuers = (const char* const*)freerdp_settings_get_pointer(
settings, FreeRDP_ServerLicenseProductIssuers);
WINPR_ASSERT(CompanyName);
WINPR_ASSERT(ProductName);
WINPR_ASSERT(ProductVersion > 0);
WINPR_ASSERT(issuers || (issuerCount == 0));
if (!license_ensure_state(license, LICENSE_STATE_INITIAL, LICENSE_REQUEST))
return FALSE;
license->ProductInfo->dwVersion = ProductVersion;
if (!license_set_string("pbCompanyName", CompanyName, &license->ProductInfo->pbCompanyName,
&license->ProductInfo->cbCompanyName))
return FALSE;
if (!license_set_string("pbProductId", ProductName, &license->ProductInfo->pbProductId,
&license->ProductInfo->cbProductId))
return FALSE;
if (!license_read_binary_blob_data(license->KeyExchangeList, BB_KEY_EXCHG_ALG_BLOB, algs,
sizeof(algs)))
return FALSE;
if (!freerdp_certificate_read_server_cert(license->certificate, settings->ServerCertificate,
settings->ServerCertificateLength))
return FALSE;
s = Stream_New(NULL, 1024);
if (!s)
return FALSE;
else
{
BOOL r = FALSE;
SSIZE_T res =
freerdp_certificate_write_server_cert(license->certificate, CERT_CHAIN_VERSION_2, s);
if (res >= 0)
r = license_read_binary_blob_data(license->ServerCertificate, BB_CERTIFICATE_BLOB,
Stream_Buffer(s), Stream_GetPosition(s));
Stream_Free(s, TRUE);
if (!r)
return FALSE;
}
if (!license_scope_list_resize(license->ScopeList, issuerCount))
return FALSE;
for (size_t x = 0; x < issuerCount; x++)
{
LICENSE_BLOB* blob = license->ScopeList->array[x];
const char* name = issuers[x];
const size_t length = strnlen(name, UINT16_MAX) + 1;
if ((length == 0) || (length > UINT16_MAX))
{
WLog_WARN(TAG,
"%s: Invalid issuer at position %" PRIuz ": length 0 < %" PRIuz " <= %" PRIu16
" ['%s']",
x, length, UINT16_MAX, name);
return FALSE;
}
if (!license_read_binary_blob_data(blob, BB_SCOPE_BLOB, name, length))
return FALSE;
}
return license_set_state(license, LICENSE_STATE_CONFIGURED);
}
rdpLicense* license_get(rdpContext* context)
{
WINPR_ASSERT(context);
WINPR_ASSERT(context->rdp);
return context->rdp->license;
}
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