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freerdp/libfreerdp/core/gcc.c

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v2.10.0
2023-05-09 21:29:50 +00:00
/**
* FreeRDP: A Remote Desktop Protocol Implementation
* T.124 Generic Conference Control (GCC)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2014 Norbert Federa <norbert.federa@thincast.com>
* Copyright 2014 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <winpr/crt.h>
#include <winpr/crypto.h>
#include <freerdp/log.h>
#include "gcc.h"
#include "certificate.h"
#define TAG FREERDP_TAG("core.gcc")
static BOOL gcc_read_client_cluster_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static BOOL gcc_read_client_core_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static BOOL gcc_read_client_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length);
static BOOL gcc_read_server_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length);
static BOOL gcc_read_user_data_header(wStream* s, UINT16* type, UINT16* length);
static void gcc_write_user_data_header(wStream* s, UINT16 type, UINT16 length);
static void gcc_write_client_core_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_server_core_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_write_server_core_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_security_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static void gcc_write_client_security_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_server_security_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_write_server_security_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_network_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static void gcc_write_client_network_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_server_network_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_write_server_network_data(wStream* s, rdpMcs* mcs);
static void gcc_write_client_cluster_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_monitor_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static BOOL gcc_write_client_monitor_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_monitor_extended_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static BOOL gcc_write_client_monitor_extended_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_message_channel_data(wStream* s, rdpMcs* mcs, UINT16 blockLength);
static void gcc_write_client_message_channel_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_server_message_channel_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_write_server_message_channel_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_client_multitransport_channel_data(wStream* s, rdpMcs* mcs,
UINT16 blockLength);
static void gcc_write_client_multitransport_channel_data(wStream* s, rdpMcs* mcs);
static BOOL gcc_read_server_multitransport_channel_data(wStream* s, rdpMcs* mcs);
static void gcc_write_server_multitransport_channel_data(wStream* s, rdpMcs* mcs);
static DWORD rdp_version_common(DWORD serverVersion, DWORD clientVersion)
{
DWORD version = MIN(serverVersion, clientVersion);
switch (version)
{
case RDP_VERSION_4:
case RDP_VERSION_5_PLUS:
case RDP_VERSION_10_0:
case RDP_VERSION_10_1:
case RDP_VERSION_10_2:
case RDP_VERSION_10_3:
case RDP_VERSION_10_4:
case RDP_VERSION_10_5:
case RDP_VERSION_10_6:
case RDP_VERSION_10_7:
return version;
default:
WLog_ERR(TAG, "Invalid client [%" PRId32 "] and server [%" PRId32 "] versions",
serverVersion, clientVersion);
return version;
}
}
/**
* T.124 GCC is defined in:
*
* http://www.itu.int/rec/T-REC-T.124-199802-S/en
* ITU-T T.124 (02/98): Generic Conference Control
*/
/**
* ConnectData ::= SEQUENCE
* {
* t124Identifier Key,
* connectPDU OCTET_STRING
* }
*
* Key ::= CHOICE
* {
* object OBJECT_IDENTIFIER,
* h221NonStandard H221NonStandardIdentifier
* }
*
* ConnectGCCPDU ::= CHOICE
* {
* conferenceCreateRequest ConferenceCreateRequest,
* conferenceCreateResponse ConferenceCreateResponse,
* conferenceQueryRequest ConferenceQueryRequest,
* conferenceQueryResponse ConferenceQueryResponse,
* conferenceJoinRequest ConferenceJoinRequest,
* conferenceJoinResponse ConferenceJoinResponse,
* conferenceInviteRequest ConferenceInviteRequest,
* conferenceInviteResponse ConferenceInviteResponse,
* ...
* }
*
* ConferenceCreateRequest ::= SEQUENCE
* {
* conferenceName ConferenceName,
* convenerPassword Password OPTIONAL,
* password Password OPTIONAL,
* lockedConference BOOLEAN,
* listedConference BOOLEAN,
* conductibleConference BOOLEAN,
* terminationMethod TerminationMethod,
* conductorPrivileges SET OF Privilege OPTIONAL,
* conductedPrivileges SET OF Privilege OPTIONAL,
* nonConductedPrivileges SET OF Privilege OPTIONAL,
* conferenceDescription TextString OPTIONAL,
* callerIdentifier TextString OPTIONAL,
* userData UserData OPTIONAL,
* ...,
* conferencePriority ConferencePriority OPTIONAL,
* conferenceMode ConferenceMode OPTIONAL
* }
*
* ConferenceCreateResponse ::= SEQUENCE
* {
* nodeID UserID,
* tag INTEGER,
* result ENUMERATED
* {
* success (0),
* userRejected (1),
* resourcesNotAvailable (2),
* rejectedForSymmetryBreaking (3),
* lockedConferenceNotSupported (4)
* },
* userData UserData OPTIONAL,
* ...
* }
*
* ConferenceName ::= SEQUENCE
* {
* numeric SimpleNumericString
* text SimpleTextString OPTIONAL,
* ...
* }
*
* SimpleNumericString ::= NumericString (SIZE (1..255)) (FROM ("0123456789"))
*
* UserData ::= SET OF SEQUENCE
* {
* key Key,
* value OCTET_STRING OPTIONAL
* }
*
* H221NonStandardIdentifier ::= OCTET STRING (SIZE (4..255))
*
* UserID ::= DynamicChannelID
*
* ChannelID ::= INTEGER (1..65535)
* StaticChannelID ::= INTEGER (1..1000)
* DynamicChannelID ::= INTEGER (1001..65535)
*
*/
/*
* OID = 0.0.20.124.0.1
* { itu-t(0) recommendation(0) t(20) t124(124) version(0) 1 }
* v.1 of ITU-T Recommendation T.124 (Feb 1998): "Generic Conference Control"
*/
BYTE t124_02_98_oid[6] = { 0, 0, 20, 124, 0, 1 };
BYTE h221_cs_key[4] = "Duca";
BYTE h221_sc_key[4] = "McDn";
/**
* Read a GCC Conference Create Request.\n
* @msdn{cc240836}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_conference_create_request(wStream* s, rdpMcs* mcs)
{
UINT16 length;
BYTE choice;
BYTE number;
BYTE selection;
/* ConnectData */
if (!per_read_choice(s, &choice))
return FALSE;
if (!per_read_object_identifier(s, t124_02_98_oid))
return FALSE;
/* ConnectData::connectPDU (OCTET_STRING) */
if (!per_read_length(s, &length))
return FALSE;
/* ConnectGCCPDU */
if (!per_read_choice(s, &choice))
return FALSE;
if (!per_read_selection(s, &selection))
return FALSE;
/* ConferenceCreateRequest::conferenceName */
if (!per_read_numeric_string(s, 1)) /* ConferenceName::numeric */
return FALSE;
if (!per_read_padding(s, 1)) /* padding */
return FALSE;
/* UserData (SET OF SEQUENCE) */
if (!per_read_number_of_sets(s, &number) || number != 1) /* one set of UserData */
return FALSE;
if (!per_read_choice(s, &choice) ||
choice != 0xC0) /* UserData::value present + select h221NonStandard (1) */
return FALSE;
/* h221NonStandard */
if (!per_read_octet_string(s, h221_cs_key, 4,
4)) /* h221NonStandard, client-to-server H.221 key, "Duca" */
return FALSE;
/* userData::value (OCTET_STRING) */
if (!per_read_length(s, &length))
return FALSE;
if (Stream_GetRemainingLength(s) < length)
return FALSE;
if (!gcc_read_client_data_blocks(s, mcs, length))
return FALSE;
return TRUE;
}
/**
* Write a GCC Conference Create Request.\n
* @msdn{cc240836}
* @param s stream
* @param user_data client data blocks
*/
void gcc_write_conference_create_request(wStream* s, wStream* userData)
{
/* ConnectData */
per_write_choice(s, 0); /* From Key select object (0) of type OBJECT_IDENTIFIER */
per_write_object_identifier(s, t124_02_98_oid); /* ITU-T T.124 (02/98) OBJECT_IDENTIFIER */
/* ConnectData::connectPDU (OCTET_STRING) */
per_write_length(s, Stream_GetPosition(userData) + 14); /* connectPDU length */
/* ConnectGCCPDU */
per_write_choice(s, 0); /* From ConnectGCCPDU select conferenceCreateRequest (0) of type
ConferenceCreateRequest */
per_write_selection(s, 0x08); /* select optional userData from ConferenceCreateRequest */
/* ConferenceCreateRequest::conferenceName */
per_write_numeric_string(s, (BYTE*)"1", 1, 1); /* ConferenceName::numeric */
per_write_padding(s, 1); /* padding */
/* UserData (SET OF SEQUENCE) */
per_write_number_of_sets(s, 1); /* one set of UserData */
per_write_choice(s, 0xC0); /* UserData::value present + select h221NonStandard (1) */
/* h221NonStandard */
per_write_octet_string(s, h221_cs_key, 4,
4); /* h221NonStandard, client-to-server H.221 key, "Duca" */
/* userData::value (OCTET_STRING) */
per_write_octet_string(s, Stream_Buffer(userData), Stream_GetPosition(userData),
0); /* array of client data blocks */
}
BOOL gcc_read_conference_create_response(wStream* s, rdpMcs* mcs)
{
UINT16 length;
UINT32 tag;
UINT16 nodeID;
BYTE result;
BYTE choice;
BYTE number;
/* ConnectData */
if (!per_read_choice(s, &choice) || !per_read_object_identifier(s, t124_02_98_oid))
return FALSE;
/* ConnectData::connectPDU (OCTET_STRING) */
if (!per_read_length(s, &length))
return FALSE;
/* ConnectGCCPDU */
if (!per_read_choice(s, &choice))
return FALSE;
/* ConferenceCreateResponse::nodeID (UserID) */
if (!per_read_integer16(s, &nodeID, 1001))
return FALSE;
/* ConferenceCreateResponse::tag (INTEGER) */
if (!per_read_integer(s, &tag))
return FALSE;
/* ConferenceCreateResponse::result (ENUMERATED) */
if (!per_read_enumerated(s, &result, MCS_Result_enum_length))
return FALSE;
/* number of UserData sets */
if (!per_read_number_of_sets(s, &number))
return FALSE;
/* UserData::value present + select h221NonStandard (1) */
if (!per_read_choice(s, &choice))
return FALSE;
/* h221NonStandard */
if (!per_read_octet_string(s, h221_sc_key, 4,
4)) /* h221NonStandard, server-to-client H.221 key, "McDn" */
return FALSE;
/* userData (OCTET_STRING) */
if (!per_read_length(s, &length))
return FALSE;
if (!gcc_read_server_data_blocks(s, mcs, length))
{
WLog_ERR(TAG, "gcc_read_conference_create_response: gcc_read_server_data_blocks failed");
return FALSE;
}
return TRUE;
}
void gcc_write_conference_create_response(wStream* s, wStream* userData)
{
/* ConnectData */
per_write_choice(s, 0);
per_write_object_identifier(s, t124_02_98_oid);
/* ConnectData::connectPDU (OCTET_STRING) */
/* This length MUST be ignored by the client according to [MS-RDPBCGR] */
per_write_length(s, 0x2A);
/* ConnectGCCPDU */
per_write_choice(s, 0x14);
/* ConferenceCreateResponse::nodeID (UserID) */
per_write_integer16(s, 0x79F3, 1001);
/* ConferenceCreateResponse::tag (INTEGER) */
per_write_integer(s, 1);
/* ConferenceCreateResponse::result (ENUMERATED) */
per_write_enumerated(s, 0, MCS_Result_enum_length);
/* number of UserData sets */
per_write_number_of_sets(s, 1);
/* UserData::value present + select h221NonStandard (1) */
per_write_choice(s, 0xC0);
/* h221NonStandard */
per_write_octet_string(s, h221_sc_key, 4,
4); /* h221NonStandard, server-to-client H.221 key, "McDn" */
/* userData (OCTET_STRING) */
per_write_octet_string(s, Stream_Buffer(userData), Stream_GetPosition(userData),
0); /* array of server data blocks */
}
BOOL gcc_read_client_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length)
{
UINT16 type;
UINT16 blockLength;
size_t begPos, endPos;
while (length > 0)
{
begPos = Stream_GetPosition(s);
if (!gcc_read_user_data_header(s, &type, &blockLength))
return FALSE;
if (Stream_GetRemainingLength(s) < (size_t)(blockLength - 4))
return FALSE;
switch (type)
{
case CS_CORE:
if (!gcc_read_client_core_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_SECURITY:
if (!gcc_read_client_security_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_NET:
if (!gcc_read_client_network_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_CLUSTER:
if (!gcc_read_client_cluster_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_MONITOR:
if (!gcc_read_client_monitor_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_MCS_MSGCHANNEL:
if (!gcc_read_client_message_channel_data(s, mcs, blockLength - 4))
return FALSE;
break;
case CS_MONITOR_EX:
if (!gcc_read_client_monitor_extended_data(s, mcs, blockLength - 4))
return FALSE;
break;
case 0xC009:
case CS_MULTITRANSPORT:
if (!gcc_read_client_multitransport_channel_data(s, mcs, blockLength - 4))
return FALSE;
break;
default:
WLog_ERR(TAG, "Unknown GCC client data block: 0x%04" PRIX16 "", type);
Stream_Seek(s, blockLength - 4);
break;
}
endPos = Stream_GetPosition(s);
if (endPos != (begPos + blockLength))
{
WLog_ERR(TAG,
"Error parsing GCC client data block 0x%04" PRIX16
": Actual Offset: %d Expected Offset: %d",
type, endPos, begPos + blockLength);
}
length -= blockLength;
Stream_SetPosition(s, begPos + blockLength);
}
return TRUE;
}
BOOL gcc_write_client_data_blocks(wStream* s, rdpMcs* mcs)
{
rdpSettings* settings = mcs->settings;
gcc_write_client_core_data(s, mcs);
gcc_write_client_cluster_data(s, mcs);
gcc_write_client_security_data(s, mcs);
gcc_write_client_network_data(s, mcs);
/* extended client data supported */
if (settings->NegotiationFlags & EXTENDED_CLIENT_DATA_SUPPORTED)
{
if (settings->UseMultimon && !settings->SpanMonitors)
{
if (!gcc_write_client_monitor_data(s, mcs))
return FALSE;
if (!gcc_write_client_monitor_extended_data(s, mcs))
return FALSE;
}
gcc_write_client_message_channel_data(s, mcs);
gcc_write_client_multitransport_channel_data(s, mcs);
}
else
{
if (settings->UseMultimon && !settings->SpanMonitors)
{
WLog_ERR(TAG, "WARNING: true multi monitor support was not advertised by server!");
if (settings->ForceMultimon)
{
WLog_ERR(TAG, "Sending multi monitor information anyway (may break connectivity!)");
if (!gcc_write_client_monitor_data(s, mcs))
return FALSE;
if (!gcc_write_client_monitor_extended_data(s, mcs))
return FALSE;
}
else
{
WLog_ERR(TAG, "Use /multimon:force to force sending multi monitor information");
}
}
}
return TRUE;
}
BOOL gcc_read_server_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length)
{
UINT16 type;
UINT16 offset = 0;
UINT16 blockLength;
BYTE* holdp;
while (offset < length)
{
size_t rest;
wStream sub;
if (!gcc_read_user_data_header(s, &type, &blockLength))
{
WLog_ERR(TAG, "gcc_read_server_data_blocks: gcc_read_user_data_header failed");
return FALSE;
}
holdp = Stream_Pointer(s);
Stream_StaticInit(&sub, holdp, blockLength - 4);
if (!Stream_SafeSeek(s, blockLength - 4))
{
WLog_ERR(TAG, "gcc_read_server_data_blocks: stream too short");
return FALSE;
}
offset += blockLength;
switch (type)
{
case SC_CORE:
if (!gcc_read_server_core_data(&sub, mcs))
{
WLog_ERR(TAG, "gcc_read_server_data_blocks: gcc_read_server_core_data failed");
return FALSE;
}
break;
case SC_SECURITY:
if (!gcc_read_server_security_data(&sub, mcs))
{
WLog_ERR(TAG,
"gcc_read_server_data_blocks: gcc_read_server_security_data failed");
return FALSE;
}
break;
case SC_NET:
if (!gcc_read_server_network_data(&sub, mcs))
{
WLog_ERR(TAG,
"gcc_read_server_data_blocks: gcc_read_server_network_data failed");
return FALSE;
}
break;
case SC_MCS_MSGCHANNEL:
if (!gcc_read_server_message_channel_data(&sub, mcs))
{
WLog_ERR(
TAG,
"gcc_read_server_data_blocks: gcc_read_server_message_channel_data failed");
return FALSE;
}
break;
case SC_MULTITRANSPORT:
if (!gcc_read_server_multitransport_channel_data(&sub, mcs))
{
WLog_ERR(TAG, "gcc_read_server_data_blocks: "
"gcc_read_server_multitransport_channel_data failed");
return FALSE;
}
break;
default:
WLog_ERR(TAG, "gcc_read_server_data_blocks: ignoring type=%" PRIu16 "", type);
break;
}
rest = Stream_GetRemainingLength(&sub);
if (rest > 0)
{
WLog_WARN(
TAG, "gcc_read_server_data_blocks: ignoring %" PRIuz " bytes with type=%" PRIu16 "",
rest, type);
}
}
return TRUE;
}
BOOL gcc_write_server_data_blocks(wStream* s, rdpMcs* mcs)
{
return gcc_write_server_core_data(s, mcs) && /* serverCoreData */
gcc_write_server_network_data(s, mcs) && /* serverNetworkData */
gcc_write_server_security_data(s, mcs) && /* serverSecurityData */
gcc_write_server_message_channel_data(s, mcs); /* serverMessageChannelData */
/* TODO: Send these GCC data blocks only when the client sent them */
// gcc_write_server_multitransport_channel_data(s, settings); /* serverMultitransportChannelData
// */
}
BOOL gcc_read_user_data_header(wStream* s, UINT16* type, UINT16* length)
{
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT16(s, *type); /* type */
Stream_Read_UINT16(s, *length); /* length */
if ((*length < 4) || (Stream_GetRemainingLength(s) < (size_t)(*length - 4)))
return FALSE;
return TRUE;
}
/**
* Write a user data header (TS_UD_HEADER).\n
* @msdn{cc240509}
* @param s stream
* @param type data block type
* @param length data block length
*/
void gcc_write_user_data_header(wStream* s, UINT16 type, UINT16 length)
{
Stream_Write_UINT16(s, type); /* type */
Stream_Write_UINT16(s, length); /* length */
}
/**
* Read a client core data block (TS_UD_CS_CORE).\n
* @msdn{cc240510}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_core_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
char* str = NULL;
UINT32 version;
BYTE connectionType = 0;
UINT32 clientColorDepth;
UINT16 colorDepth = 0;
UINT16 postBeta2ColorDepth = 0;
UINT16 highColorDepth = 0;
UINT16 supportedColorDepths = 0;
UINT32 serverSelectedProtocol = 0;
UINT16 earlyCapabilityFlags = 0;
rdpSettings* settings = mcs->settings;
/* Length of all required fields, until imeFileName */
if (blockLength < 128)
return FALSE;
Stream_Read_UINT32(s, version); /* version (4 bytes) */
settings->RdpVersion = rdp_version_common(version, settings->RdpVersion);
Stream_Read_UINT16(s, settings->DesktopWidth); /* DesktopWidth (2 bytes) */
Stream_Read_UINT16(s, settings->DesktopHeight); /* DesktopHeight (2 bytes) */
Stream_Read_UINT16(s, colorDepth); /* ColorDepth (2 bytes) */
Stream_Seek_UINT16(s); /* SASSequence (Secure Access Sequence) (2 bytes) */
Stream_Read_UINT32(s, settings->KeyboardLayout); /* KeyboardLayout (4 bytes) */
Stream_Read_UINT32(s, settings->ClientBuild); /* ClientBuild (4 bytes) */
/* clientName (32 bytes, null-terminated unicode, truncated to 15 characters) */
if (ConvertFromUnicode(CP_UTF8, 0, (WCHAR*)Stream_Pointer(s), 32 / 2, &str, 0, NULL, NULL) < 1)
{
WLog_ERR(TAG, "failed to convert client host name");
return FALSE;
}
Stream_Seek(s, 32);
free(settings->ClientHostname);
settings->ClientHostname = str;
str = NULL;
Stream_Read_UINT32(s, settings->KeyboardType); /* KeyboardType (4 bytes) */
Stream_Read_UINT32(s, settings->KeyboardSubType); /* KeyboardSubType (4 bytes) */
Stream_Read_UINT32(s, settings->KeyboardFunctionKey); /* KeyboardFunctionKey (4 bytes) */
Stream_Seek(s, 64); /* imeFileName (64 bytes) */
blockLength -= 128;
/**
* The following fields are all optional. If one field is present, all of the preceding
* fields MUST also be present. If one field is not present, all of the subsequent fields
* MUST NOT be present.
* We must check the bytes left before reading each field.
*/
do
{
if (blockLength < 2)
break;
Stream_Read_UINT16(s, postBeta2ColorDepth); /* postBeta2ColorDepth (2 bytes) */
blockLength -= 2;
if (blockLength < 2)
break;
Stream_Seek_UINT16(s); /* clientProductID (2 bytes) */
blockLength -= 2;
if (blockLength < 4)
break;
Stream_Seek_UINT32(s); /* serialNumber (4 bytes) */
blockLength -= 4;
if (blockLength < 2)
break;
Stream_Read_UINT16(s, highColorDepth); /* highColorDepth (2 bytes) */
blockLength -= 2;
if (blockLength < 2)
break;
Stream_Read_UINT16(s, supportedColorDepths); /* supportedColorDepths (2 bytes) */
blockLength -= 2;
if (blockLength < 2)
break;
Stream_Read_UINT16(s, earlyCapabilityFlags); /* earlyCapabilityFlags (2 bytes) */
settings->EarlyCapabilityFlags = (UINT32)earlyCapabilityFlags;
blockLength -= 2;
/* clientDigProductId (64 bytes): Contains a value that uniquely identifies the client */
if (blockLength < 64)
break;
if (ConvertFromUnicode(CP_UTF8, 0, (WCHAR*)Stream_Pointer(s), 64 / 2, &str, 0, NULL, NULL) <
1)
{
WLog_ERR(TAG, "failed to convert the client product identifier");
return FALSE;
}
Stream_Seek(s, 64); /* clientDigProductId (64 bytes) */
free(settings->ClientProductId);
settings->ClientProductId = str;
blockLength -= 64;
if (blockLength < 1)
break;
Stream_Read_UINT8(s, connectionType); /* connectionType (1 byte) */
blockLength -= 1;
if (blockLength < 1)
break;
Stream_Seek_UINT8(s); /* pad1octet (1 byte) */
blockLength -= 1;
if (blockLength < 4)
break;
Stream_Read_UINT32(s, serverSelectedProtocol); /* serverSelectedProtocol (4 bytes) */
blockLength -= 4;
if (blockLength < 4)
break;
Stream_Read_UINT32(s, settings->DesktopPhysicalWidth); /* desktopPhysicalWidth (4 bytes) */
blockLength -= 4;
if (blockLength < 4)
break;
Stream_Read_UINT32(s,
settings->DesktopPhysicalHeight); /* desktopPhysicalHeight (4 bytes) */
blockLength -= 4;
if (blockLength < 2)
break;
Stream_Read_UINT16(s, settings->DesktopOrientation); /* desktopOrientation (2 bytes) */
blockLength -= 2;
if (blockLength < 4)
break;
Stream_Read_UINT32(s, settings->DesktopScaleFactor); /* desktopScaleFactor (4 bytes) */
blockLength -= 4;
if (blockLength < 4)
break;
Stream_Read_UINT32(s, settings->DeviceScaleFactor); /* deviceScaleFactor (4 bytes) */
if (settings->SelectedProtocol != serverSelectedProtocol)
return FALSE;
} while (0);
if (highColorDepth > 0)
{
if (earlyCapabilityFlags & RNS_UD_CS_WANT_32BPP_SESSION)
clientColorDepth = 32;
else
clientColorDepth = highColorDepth;
}
else if (postBeta2ColorDepth > 0)
{
switch (postBeta2ColorDepth)
{
case RNS_UD_COLOR_4BPP:
clientColorDepth = 4;
break;
case RNS_UD_COLOR_8BPP:
clientColorDepth = 8;
break;
case RNS_UD_COLOR_16BPP_555:
clientColorDepth = 15;
break;
case RNS_UD_COLOR_16BPP_565:
clientColorDepth = 16;
break;
case RNS_UD_COLOR_24BPP:
clientColorDepth = 24;
break;
default:
return FALSE;
}
}
else
{
switch (colorDepth)
{
case RNS_UD_COLOR_4BPP:
clientColorDepth = 4;
break;
case RNS_UD_COLOR_8BPP:
clientColorDepth = 8;
break;
default:
return FALSE;
}
}
/*
* If we are in server mode, accept client's color depth only if
* it is smaller than ours. This is what Windows server does.
*/
if ((clientColorDepth < settings->ColorDepth) || !settings->ServerMode)
settings->ColorDepth = clientColorDepth;
if (settings->NetworkAutoDetect)
settings->NetworkAutoDetect =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_NETCHAR_AUTODETECT) ? TRUE : FALSE;
if (settings->SupportHeartbeatPdu)
settings->SupportHeartbeatPdu =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_HEARTBEAT_PDU) ? TRUE : FALSE;
if (settings->SupportGraphicsPipeline)
settings->SupportGraphicsPipeline =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_DYNVC_GFX_PROTOCOL) ? TRUE : FALSE;
if (settings->SupportDynamicTimeZone)
settings->SupportDynamicTimeZone =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_DYNAMIC_TIME_ZONE) ? TRUE : FALSE;
if (settings->SupportMonitorLayoutPdu)
settings->SupportMonitorLayoutPdu =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_MONITOR_LAYOUT_PDU) ? TRUE : FALSE;
if (settings->SupportStatusInfoPdu)
settings->SupportStatusInfoPdu =
(earlyCapabilityFlags & RNS_UD_CS_SUPPORT_STATUSINFO_PDU) ? TRUE : FALSE;
if (!(earlyCapabilityFlags & RNS_UD_CS_VALID_CONNECTION_TYPE))
connectionType = 0;
settings->SupportErrorInfoPdu = earlyCapabilityFlags & RNS_UD_CS_SUPPORT_ERRINFO_PDU;
settings->ConnectionType = connectionType;
return TRUE;
}
/**
* Write a client core data block (TS_UD_CS_CORE).\n
* @msdn{cc240510}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_core_data(wStream* s, rdpMcs* mcs)
{
WCHAR* clientName = NULL;
int clientNameLength;
BYTE connectionType;
UINT16 highColorDepth;
UINT16 supportedColorDepths;
UINT16 earlyCapabilityFlags;
WCHAR* clientDigProductId = NULL;
int clientDigProductIdLength;
rdpSettings* settings = mcs->settings;
gcc_write_user_data_header(s, CS_CORE, 234);
clientNameLength = ConvertToUnicode(CP_UTF8, 0, settings->ClientHostname, -1, &clientName, 0);
clientDigProductIdLength =
ConvertToUnicode(CP_UTF8, 0, settings->ClientProductId, -1, &clientDigProductId, 0);
Stream_Write_UINT32(s, settings->RdpVersion); /* Version */
Stream_Write_UINT16(s, settings->DesktopWidth); /* DesktopWidth */
Stream_Write_UINT16(s, settings->DesktopHeight); /* DesktopHeight */
Stream_Write_UINT16(s,
RNS_UD_COLOR_8BPP); /* ColorDepth, ignored because of postBeta2ColorDepth */
Stream_Write_UINT16(s, RNS_UD_SAS_DEL); /* SASSequence (Secure Access Sequence) */
Stream_Write_UINT32(s, settings->KeyboardLayout); /* KeyboardLayout */
Stream_Write_UINT32(s, settings->ClientBuild); /* ClientBuild */
/* clientName (32 bytes, null-terminated unicode, truncated to 15 characters) */
if (clientNameLength >= 16)
{
clientNameLength = 16;
clientName[clientNameLength - 1] = 0;
}
Stream_Write(s, clientName, (clientNameLength * 2));
Stream_Zero(s, 32 - (clientNameLength * 2));
free(clientName);
Stream_Write_UINT32(s, settings->KeyboardType); /* KeyboardType */
Stream_Write_UINT32(s, settings->KeyboardSubType); /* KeyboardSubType */
Stream_Write_UINT32(s, settings->KeyboardFunctionKey); /* KeyboardFunctionKey */
Stream_Zero(s, 64); /* imeFileName */
Stream_Write_UINT16(s, RNS_UD_COLOR_8BPP); /* postBeta2ColorDepth */
Stream_Write_UINT16(s, 1); /* clientProductID */
Stream_Write_UINT32(s, 0); /* serialNumber (should be initialized to 0) */
highColorDepth = MIN(settings->ColorDepth, 24);
supportedColorDepths = RNS_UD_24BPP_SUPPORT | RNS_UD_16BPP_SUPPORT | RNS_UD_15BPP_SUPPORT;
earlyCapabilityFlags = RNS_UD_CS_SUPPORT_ERRINFO_PDU;
connectionType = settings->ConnectionType;
if (connectionType)
earlyCapabilityFlags |= RNS_UD_CS_VALID_CONNECTION_TYPE;
if (settings->ColorDepth == 32)
{
supportedColorDepths |= RNS_UD_32BPP_SUPPORT;
earlyCapabilityFlags |= RNS_UD_CS_WANT_32BPP_SESSION;
}
if (settings->NetworkAutoDetect)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_NETCHAR_AUTODETECT;
if (settings->SupportHeartbeatPdu)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_HEARTBEAT_PDU;
if (settings->SupportGraphicsPipeline)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_DYNVC_GFX_PROTOCOL;
if (settings->SupportDynamicTimeZone)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_DYNAMIC_TIME_ZONE;
if (settings->SupportMonitorLayoutPdu)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_MONITOR_LAYOUT_PDU;
if (settings->SupportStatusInfoPdu)
earlyCapabilityFlags |= RNS_UD_CS_SUPPORT_STATUSINFO_PDU;
Stream_Write_UINT16(s, highColorDepth); /* highColorDepth */
Stream_Write_UINT16(s, supportedColorDepths); /* supportedColorDepths */
Stream_Write_UINT16(s, earlyCapabilityFlags); /* earlyCapabilityFlags */
/* clientDigProductId (64 bytes, null-terminated unicode, truncated to 31 characters) */
if (clientDigProductIdLength >= 32)
{
clientDigProductIdLength = 32;
clientDigProductId[clientDigProductIdLength - 1] = 0;
}
Stream_Write(s, clientDigProductId, (clientDigProductIdLength * 2));
Stream_Zero(s, 64 - (clientDigProductIdLength * 2));
free(clientDigProductId);
Stream_Write_UINT8(s, connectionType); /* connectionType */
Stream_Write_UINT8(s, 0); /* pad1octet */
Stream_Write_UINT32(s, settings->SelectedProtocol); /* serverSelectedProtocol */
Stream_Write_UINT32(s, settings->DesktopPhysicalWidth); /* desktopPhysicalWidth */
Stream_Write_UINT32(s, settings->DesktopPhysicalHeight); /* desktopPhysicalHeight */
Stream_Write_UINT16(s, settings->DesktopOrientation); /* desktopOrientation */
Stream_Write_UINT32(s, settings->DesktopScaleFactor); /* desktopScaleFactor */
Stream_Write_UINT32(s, settings->DeviceScaleFactor); /* deviceScaleFactor */
}
BOOL gcc_read_server_core_data(wStream* s, rdpMcs* mcs)
{
UINT32 serverVersion;
UINT32 clientRequestedProtocols;
UINT32 earlyCapabilityFlags;
rdpSettings* settings = mcs->settings;
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT32(s, serverVersion); /* version */
settings->RdpVersion = rdp_version_common(serverVersion, settings->RdpVersion);
if (Stream_GetRemainingLength(s) >= 4)
{
Stream_Read_UINT32(s, clientRequestedProtocols); /* clientRequestedProtocols */
}
if (Stream_GetRemainingLength(s) >= 4)
{
Stream_Read_UINT32(s, earlyCapabilityFlags); /* earlyCapabilityFlags */
}
return TRUE;
}
BOOL gcc_write_server_core_data(wStream* s, rdpMcs* mcs)
{
UINT32 earlyCapabilityFlags = 0;
rdpSettings* settings = mcs->settings;
if (!Stream_EnsureRemainingCapacity(s, 20))
return FALSE;
gcc_write_user_data_header(s, SC_CORE, 16);
if (settings->SupportDynamicTimeZone)
earlyCapabilityFlags |= RNS_UD_SC_DYNAMIC_DST_SUPPORTED;
Stream_Write_UINT32(s, settings->RdpVersion); /* version (4 bytes) */
Stream_Write_UINT32(s, settings->RequestedProtocols); /* clientRequestedProtocols (4 bytes) */
Stream_Write_UINT32(s, earlyCapabilityFlags); /* earlyCapabilityFlags (4 bytes) */
return TRUE;
}
/**
* Read a client security data block (TS_UD_CS_SEC).\n
* @msdn{cc240511}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_security_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
rdpSettings* settings = mcs->settings;
if (blockLength < 8)
return FALSE;
if (settings->UseRdpSecurityLayer)
{
Stream_Read_UINT32(s, settings->EncryptionMethods); /* encryptionMethods */
if (settings->EncryptionMethods == 0)
Stream_Read_UINT32(s, settings->EncryptionMethods); /* extEncryptionMethods */
else
Stream_Seek(s, 4);
}
else
{
Stream_Seek(s, 8);
}
return TRUE;
}
/**
* Write a client security data block (TS_UD_CS_SEC).\n
* @msdn{cc240511}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_security_data(wStream* s, rdpMcs* mcs)
{
rdpSettings* settings = mcs->settings;
gcc_write_user_data_header(s, CS_SECURITY, 12);
if (settings->UseRdpSecurityLayer)
{
Stream_Write_UINT32(s, settings->EncryptionMethods); /* encryptionMethods */
Stream_Write_UINT32(s, 0); /* extEncryptionMethods */
}
else
{
/* French locale, disable encryption */
Stream_Write_UINT32(s, 0); /* encryptionMethods */
Stream_Write_UINT32(s, settings->EncryptionMethods); /* extEncryptionMethods */
}
}
BOOL gcc_read_server_security_data(wStream* s, rdpMcs* mcs)
{
BYTE* data;
UINT32 length;
rdpSettings* settings = mcs->settings;
BOOL validCryptoConfig = FALSE;
UINT32 serverEncryptionMethod;
if (Stream_GetRemainingLength(s) < 8)
return FALSE;
Stream_Read_UINT32(s, serverEncryptionMethod); /* encryptionMethod */
Stream_Read_UINT32(s, settings->EncryptionLevel); /* encryptionLevel */
/* Only accept valid/known encryption methods */
switch (serverEncryptionMethod)
{
case ENCRYPTION_METHOD_NONE:
WLog_DBG(TAG, "Server rdp encryption method: NONE");
break;
case ENCRYPTION_METHOD_40BIT:
WLog_DBG(TAG, "Server rdp encryption method: 40BIT");
break;
case ENCRYPTION_METHOD_56BIT:
WLog_DBG(TAG, "Server rdp encryption method: 56BIT");
break;
case ENCRYPTION_METHOD_128BIT:
WLog_DBG(TAG, "Server rdp encryption method: 128BIT");
break;
case ENCRYPTION_METHOD_FIPS:
WLog_DBG(TAG, "Server rdp encryption method: FIPS");
break;
default:
WLog_ERR(TAG, "Received unknown encryption method %08" PRIX32 "",
serverEncryptionMethod);
return FALSE;
}
if (settings->UseRdpSecurityLayer && !(settings->EncryptionMethods & serverEncryptionMethod))
{
WLog_WARN(TAG, "Server uses non-advertised encryption method 0x%08" PRIX32 "",
serverEncryptionMethod);
/* FIXME: Should we return FALSE; in this case ?? */
}
settings->EncryptionMethods = serverEncryptionMethod;
/* Verify encryption level/method combinations according to MS-RDPBCGR Section 5.3.2 */
switch (settings->EncryptionLevel)
{
case ENCRYPTION_LEVEL_NONE:
if (settings->EncryptionMethods == ENCRYPTION_METHOD_NONE)
{
validCryptoConfig = TRUE;
}
break;
case ENCRYPTION_LEVEL_FIPS:
if (settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
validCryptoConfig = TRUE;
}
break;
case ENCRYPTION_LEVEL_LOW:
case ENCRYPTION_LEVEL_HIGH:
case ENCRYPTION_LEVEL_CLIENT_COMPATIBLE:
if (settings->EncryptionMethods == ENCRYPTION_METHOD_40BIT ||
settings->EncryptionMethods == ENCRYPTION_METHOD_56BIT ||
settings->EncryptionMethods == ENCRYPTION_METHOD_128BIT ||
settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
validCryptoConfig = TRUE;
}
break;
default:
WLog_ERR(TAG, "Received unknown encryption level 0x%08" PRIX32 "",
settings->EncryptionLevel);
}
if (!validCryptoConfig)
{
WLog_ERR(TAG,
"Received invalid cryptographic configuration (level=0x%08" PRIX32
" method=0x%08" PRIX32 ")",
settings->EncryptionLevel, settings->EncryptionMethods);
return FALSE;
}
if (settings->EncryptionLevel == ENCRYPTION_LEVEL_NONE)
{
/* serverRandomLen and serverCertLen must not be present */
settings->UseRdpSecurityLayer = FALSE;
return TRUE;
}
if (Stream_GetRemainingLength(s) < 8)
return FALSE;
Stream_Read_UINT32(s, settings->ServerRandomLength); /* serverRandomLen */
Stream_Read_UINT32(s, settings->ServerCertificateLength); /* serverCertLen */
if ((settings->ServerRandomLength == 0) || (settings->ServerCertificateLength == 0))
return FALSE;
if (Stream_GetRemainingLength(s) < settings->ServerRandomLength)
return FALSE;
/* serverRandom */
settings->ServerRandom = (BYTE*)malloc(settings->ServerRandomLength);
if (!settings->ServerRandom)
goto fail;
Stream_Read(s, settings->ServerRandom, settings->ServerRandomLength);
if (Stream_GetRemainingLength(s) < settings->ServerCertificateLength)
goto fail;
/* serverCertificate */
settings->ServerCertificate = (BYTE*)malloc(settings->ServerCertificateLength);
if (!settings->ServerCertificate)
goto fail;
Stream_Read(s, settings->ServerCertificate, settings->ServerCertificateLength);
certificate_free(settings->RdpServerCertificate);
settings->RdpServerCertificate = certificate_new();
if (!settings->RdpServerCertificate)
goto fail;
data = settings->ServerCertificate;
length = settings->ServerCertificateLength;
if (!certificate_read_server_certificate(settings->RdpServerCertificate, data, length))
goto fail;
return TRUE;
fail:
free(settings->ServerRandom);
free(settings->ServerCertificate);
settings->ServerRandom = NULL;
settings->ServerCertificate = NULL;
return FALSE;
}
static const BYTE initial_signature[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01
};
/*
* Terminal Services Signing Keys.
* Yes, Terminal Services Private Key is publicly available.
*/
const BYTE tssk_modulus[] = { 0x3d, 0x3a, 0x5e, 0xbd, 0x72, 0x43, 0x3e, 0xc9, 0x4d, 0xbb, 0xc1,
0x1e, 0x4a, 0xba, 0x5f, 0xcb, 0x3e, 0x88, 0x20, 0x87, 0xef, 0xf5,
0xc1, 0xe2, 0xd7, 0xb7, 0x6b, 0x9a, 0xf2, 0x52, 0x45, 0x95, 0xce,
0x63, 0x65, 0x6b, 0x58, 0x3a, 0xfe, 0xef, 0x7c, 0xe7, 0xbf, 0xfe,
0x3d, 0xf6, 0x5c, 0x7d, 0x6c, 0x5e, 0x06, 0x09, 0x1a, 0xf5, 0x61,
0xbb, 0x20, 0x93, 0x09, 0x5f, 0x05, 0x6d, 0xea, 0x87 };
const BYTE tssk_privateExponent[] = {
0x87, 0xa7, 0x19, 0x32, 0xda, 0x11, 0x87, 0x55, 0x58, 0x00, 0x16, 0x16, 0x25, 0x65, 0x68, 0xf8,
0x24, 0x3e, 0xe6, 0xfa, 0xe9, 0x67, 0x49, 0x94, 0xcf, 0x92, 0xcc, 0x33, 0x99, 0xe8, 0x08, 0x60,
0x17, 0x9a, 0x12, 0x9f, 0x24, 0xdd, 0xb1, 0x24, 0x99, 0xc7, 0x3a, 0xb8, 0x0a, 0x7b, 0x0d, 0xdd,
0x35, 0x07, 0x79, 0x17, 0x0b, 0x51, 0x9b, 0xb3, 0xc7, 0x10, 0x01, 0x13, 0xe7, 0x3f, 0xf3, 0x5f
};
const BYTE tssk_exponent[] = { 0x5b, 0x7b, 0x88, 0xc0 };
BOOL gcc_write_server_security_data(wStream* s, rdpMcs* mcs)
{
BYTE* sigData;
int expLen, keyLen, sigDataLen;
BYTE encryptedSignature[TSSK_KEY_LENGTH];
BYTE signature[sizeof(initial_signature)];
UINT32 headerLen, serverRandomLen, serverCertLen, wPublicKeyBlobLen;
rdpSettings* settings = mcs->settings;
/**
* Re: settings->EncryptionLevel:
* This is configured/set by the server implementation and serves the same
* purpose as the "Encryption Level" setting in the RDP-Tcp configuration
* dialog of Microsoft's Remote Desktop Session Host Configuration.
* Re: settings->EncryptionMethods:
* at this point this setting contains the client's supported encryption
* methods we've received in gcc_read_client_security_data()
*/
if (!settings->UseRdpSecurityLayer)
{
/* TLS/NLA is used: disable rdp style encryption */
settings->EncryptionLevel = ENCRYPTION_LEVEL_NONE;
}
/* verify server encryption level value */
switch (settings->EncryptionLevel)
{
case ENCRYPTION_LEVEL_NONE:
WLog_INFO(TAG, "Active rdp encryption level: NONE");
break;
case ENCRYPTION_LEVEL_FIPS:
WLog_INFO(TAG, "Active rdp encryption level: FIPS Compliant");
break;
case ENCRYPTION_LEVEL_HIGH:
WLog_INFO(TAG, "Active rdp encryption level: HIGH");
break;
case ENCRYPTION_LEVEL_LOW:
WLog_INFO(TAG, "Active rdp encryption level: LOW");
break;
case ENCRYPTION_LEVEL_CLIENT_COMPATIBLE:
WLog_INFO(TAG, "Active rdp encryption level: CLIENT-COMPATIBLE");
break;
default:
WLog_ERR(TAG, "Invalid server encryption level 0x%08" PRIX32 "",
settings->EncryptionLevel);
WLog_ERR(TAG, "Switching to encryption level CLIENT-COMPATIBLE");
settings->EncryptionLevel = ENCRYPTION_LEVEL_CLIENT_COMPATIBLE;
}
/* choose rdp encryption method based on server level and client methods */
switch (settings->EncryptionLevel)
{
case ENCRYPTION_LEVEL_NONE:
/* The only valid method is NONE in this case */
settings->EncryptionMethods = ENCRYPTION_METHOD_NONE;
break;
case ENCRYPTION_LEVEL_FIPS:
/* The only valid method is FIPS in this case */
if (!(settings->EncryptionMethods & ENCRYPTION_METHOD_FIPS))
{
WLog_WARN(TAG, "client does not support FIPS as required by server configuration");
}
settings->EncryptionMethods = ENCRYPTION_METHOD_FIPS;
break;
case ENCRYPTION_LEVEL_HIGH:
/* Maximum key strength supported by the server must be used (128 bit)*/
if (!(settings->EncryptionMethods & ENCRYPTION_METHOD_128BIT))
{
WLog_WARN(TAG, "client does not support 128 bit encryption method as required by "
"server configuration");
}
settings->EncryptionMethods = ENCRYPTION_METHOD_128BIT;
break;
case ENCRYPTION_LEVEL_LOW:
case ENCRYPTION_LEVEL_CLIENT_COMPATIBLE:
/* Maximum key strength supported by the client must be used */
if (settings->EncryptionMethods & ENCRYPTION_METHOD_128BIT)
settings->EncryptionMethods = ENCRYPTION_METHOD_128BIT;
else if (settings->EncryptionMethods & ENCRYPTION_METHOD_56BIT)
settings->EncryptionMethods = ENCRYPTION_METHOD_56BIT;
else if (settings->EncryptionMethods & ENCRYPTION_METHOD_40BIT)
settings->EncryptionMethods = ENCRYPTION_METHOD_40BIT;
else if (settings->EncryptionMethods & ENCRYPTION_METHOD_FIPS)
settings->EncryptionMethods = ENCRYPTION_METHOD_FIPS;
else
{
WLog_WARN(TAG, "client has not announced any supported encryption methods");
settings->EncryptionMethods = ENCRYPTION_METHOD_128BIT;
}
break;
default:
WLog_ERR(TAG, "internal error: unknown encryption level");
return FALSE;
}
/* log selected encryption method */
switch (settings->EncryptionMethods)
{
case ENCRYPTION_METHOD_NONE:
WLog_INFO(TAG, "Selected rdp encryption method: NONE");
break;
case ENCRYPTION_METHOD_40BIT:
WLog_INFO(TAG, "Selected rdp encryption method: 40BIT");
break;
case ENCRYPTION_METHOD_56BIT:
WLog_INFO(TAG, "Selected rdp encryption method: 56BIT");
break;
case ENCRYPTION_METHOD_128BIT:
WLog_INFO(TAG, "Selected rdp encryption method: 128BIT");
break;
case ENCRYPTION_METHOD_FIPS:
WLog_INFO(TAG, "Selected rdp encryption method: FIPS");
break;
default:
WLog_ERR(TAG, "internal error: unknown encryption method");
return FALSE;
}
headerLen = 12;
keyLen = 0;
wPublicKeyBlobLen = 0;
serverRandomLen = 0;
serverCertLen = 0;
if (settings->EncryptionMethods != ENCRYPTION_METHOD_NONE)
{
serverRandomLen = 32;
keyLen = settings->RdpServerRsaKey->ModulusLength;
expLen = sizeof(settings->RdpServerRsaKey->exponent);
wPublicKeyBlobLen = 4; /* magic (RSA1) */
wPublicKeyBlobLen += 4; /* keylen */
wPublicKeyBlobLen += 4; /* bitlen */
wPublicKeyBlobLen += 4; /* datalen */
wPublicKeyBlobLen += expLen;
wPublicKeyBlobLen += keyLen;
wPublicKeyBlobLen += 8; /* 8 bytes of zero padding */
serverCertLen = 4; /* dwVersion */
serverCertLen += 4; /* dwSigAlgId */
serverCertLen += 4; /* dwKeyAlgId */
serverCertLen += 2; /* wPublicKeyBlobType */
serverCertLen += 2; /* wPublicKeyBlobLen */
serverCertLen += wPublicKeyBlobLen;
serverCertLen += 2; /* wSignatureBlobType */
serverCertLen += 2; /* wSignatureBlobLen */
serverCertLen += sizeof(encryptedSignature); /* SignatureBlob */
serverCertLen += 8; /* 8 bytes of zero padding */
headerLen += sizeof(serverRandomLen);
headerLen += sizeof(serverCertLen);
headerLen += serverRandomLen;
headerLen += serverCertLen;
}
if (!Stream_EnsureRemainingCapacity(s, headerLen + 4))
return FALSE;
gcc_write_user_data_header(s, SC_SECURITY, headerLen);
Stream_Write_UINT32(s, settings->EncryptionMethods); /* encryptionMethod */
Stream_Write_UINT32(s, settings->EncryptionLevel); /* encryptionLevel */
if (settings->EncryptionMethods == ENCRYPTION_METHOD_NONE)
{
return TRUE;
}
Stream_Write_UINT32(s, serverRandomLen); /* serverRandomLen */
Stream_Write_UINT32(s, serverCertLen); /* serverCertLen */
settings->ServerRandomLength = serverRandomLen;
settings->ServerRandom = (BYTE*)malloc(serverRandomLen);
if (!settings->ServerRandom)
{
return FALSE;
}
winpr_RAND(settings->ServerRandom, serverRandomLen);
Stream_Write(s, settings->ServerRandom, serverRandomLen);
sigData = Stream_Pointer(s);
Stream_Write_UINT32(s, CERT_CHAIN_VERSION_1); /* dwVersion (4 bytes) */
Stream_Write_UINT32(s, SIGNATURE_ALG_RSA); /* dwSigAlgId */
Stream_Write_UINT32(s, KEY_EXCHANGE_ALG_RSA); /* dwKeyAlgId */
Stream_Write_UINT16(s, BB_RSA_KEY_BLOB); /* wPublicKeyBlobType */
Stream_Write_UINT16(s, wPublicKeyBlobLen); /* wPublicKeyBlobLen */
Stream_Write(s, "RSA1", 4); /* magic */
Stream_Write_UINT32(s, keyLen + 8); /* keylen */
Stream_Write_UINT32(s, keyLen * 8); /* bitlen */
Stream_Write_UINT32(s, keyLen - 1); /* datalen */
Stream_Write(s, settings->RdpServerRsaKey->exponent, expLen);
Stream_Write(s, settings->RdpServerRsaKey->Modulus, keyLen);
Stream_Zero(s, 8);
sigDataLen = Stream_Pointer(s) - sigData;
Stream_Write_UINT16(s, BB_RSA_SIGNATURE_BLOB); /* wSignatureBlobType */
Stream_Write_UINT16(s, sizeof(encryptedSignature) + 8); /* wSignatureBlobLen */
memcpy(signature, initial_signature, sizeof(initial_signature));
if (!winpr_Digest(WINPR_MD_MD5, sigData, sigDataLen, signature, sizeof(signature)))
return FALSE;
crypto_rsa_private_encrypt(signature, sizeof(signature), TSSK_KEY_LENGTH, tssk_modulus,
tssk_privateExponent, encryptedSignature);
Stream_Write(s, encryptedSignature, sizeof(encryptedSignature));
Stream_Zero(s, 8);
return TRUE;
}
/**
* Read a client network data block (TS_UD_CS_NET).\n
* @msdn{cc240512}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_network_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 i;
if (blockLength < 4)
return FALSE;
Stream_Read_UINT32(s, mcs->channelCount); /* channelCount */
if (blockLength < 4 + mcs->channelCount * 12)
return FALSE;
if (mcs->channelCount > CHANNEL_MAX_COUNT)
return FALSE;
/* channelDefArray */
for (i = 0; i < mcs->channelCount; i++)
{
/**
* CHANNEL_DEF
* - name: an 8-byte array containing a null-terminated collection
* of seven ANSI characters that uniquely identify the channel.
* - options: a 32-bit, unsigned integer. Channel option flags
*/
Stream_Read(s, mcs->channels[i].Name, 8); /* name (8 bytes) */
if (!memchr(mcs->channels[i].Name, 0, 8))
{
WLog_ERR(
TAG,
"protocol violation: received a static channel name with missing null-termination");
return FALSE;
}
Stream_Read_UINT32(s, mcs->channels[i].options); /* options (4 bytes) */
mcs->channels[i].ChannelId = mcs->baseChannelId++;
}
return TRUE;
}
/**
* Write a client network data block (TS_UD_CS_NET).\n
* @msdn{cc240512}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_network_data(wStream* s, rdpMcs* mcs)
{
UINT32 i;
UINT16 length;
if (mcs->channelCount > 0)
{
length = mcs->channelCount * 12 + 8;
gcc_write_user_data_header(s, CS_NET, length);
Stream_Write_UINT32(s, mcs->channelCount); /* channelCount */
/* channelDefArray */
for (i = 0; i < mcs->channelCount; i++)
{
/* CHANNEL_DEF */
Stream_Write(s, mcs->channels[i].Name, 8); /* name (8 bytes) */
Stream_Write_UINT32(s, mcs->channels[i].options); /* options (4 bytes) */
}
}
}
BOOL gcc_read_server_network_data(wStream* s, rdpMcs* mcs)
{
int i;
UINT16 channelId;
UINT16 MCSChannelId;
UINT16 channelCount;
UINT16 parsedChannelCount;
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT16(s, MCSChannelId); /* MCSChannelId */
Stream_Read_UINT16(s, channelCount); /* channelCount */
parsedChannelCount = channelCount;
if (channelCount != mcs->channelCount)
{
WLog_ERR(TAG, "requested %" PRIu32 " channels, got %" PRIu16 " instead", mcs->channelCount,
channelCount);
/* we ensure that the response is not bigger than the request */
if (channelCount > mcs->channelCount)
parsedChannelCount = mcs->channelCount;
}
if (Stream_GetRemainingLength(s) < (size_t)channelCount * 2)
return FALSE;
for (i = 0; i < parsedChannelCount; i++)
{
Stream_Read_UINT16(s, channelId); /* channelId */
mcs->channels[i].ChannelId = channelId;
}
if (channelCount % 2 == 1)
return Stream_SafeSeek(s, 2); /* padding */
return TRUE;
}
BOOL gcc_write_server_network_data(wStream* s, rdpMcs* mcs)
{
UINT32 i;
int payloadLen = 8 + mcs->channelCount * 2 + (mcs->channelCount % 2 == 1 ? 2 : 0);
if (!Stream_EnsureRemainingCapacity(s, payloadLen + 4))
return FALSE;
gcc_write_user_data_header(s, SC_NET, payloadLen);
Stream_Write_UINT16(s, MCS_GLOBAL_CHANNEL_ID); /* MCSChannelId */
Stream_Write_UINT16(s, mcs->channelCount); /* channelCount */
for (i = 0; i < mcs->channelCount; i++)
{
Stream_Write_UINT16(s, mcs->channels[i].ChannelId);
}
if (mcs->channelCount % 2 == 1)
Stream_Write_UINT16(s, 0);
return TRUE;
}
/**
* Read a client cluster data block (TS_UD_CS_CLUSTER).\n
* @msdn{cc240514}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_cluster_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 flags;
UINT32 redirectedSessionId;
rdpSettings* settings = mcs->settings;
if (blockLength < 8)
return FALSE;
Stream_Read_UINT32(s, flags); /* flags */
Stream_Read_UINT32(s, redirectedSessionId); /* redirectedSessionId */
if (flags & REDIRECTED_SESSIONID_FIELD_VALID)
settings->RedirectedSessionId = redirectedSessionId;
if (blockLength != 8)
{
if (Stream_GetRemainingLength(s) >= (size_t)(blockLength - 8))
{
/* The old Microsoft Mac RDP client can send a pad here */
Stream_Seek(s, (blockLength - 8));
}
}
return TRUE;
}
/**
* Write a client cluster data block (TS_UD_CS_CLUSTER).\n
* @msdn{cc240514}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_cluster_data(wStream* s, rdpMcs* mcs)
{
UINT32 flags;
rdpSettings* settings = mcs->settings;
gcc_write_user_data_header(s, CS_CLUSTER, 12);
flags = REDIRECTION_SUPPORTED | (REDIRECTION_VERSION4 << 2);
if (settings->ConsoleSession || settings->RedirectedSessionId)
flags |= REDIRECTED_SESSIONID_FIELD_VALID;
if (settings->RedirectSmartCards)
flags |= REDIRECTED_SMARTCARD;
Stream_Write_UINT32(s, flags); /* flags */
Stream_Write_UINT32(s, settings->RedirectedSessionId); /* redirectedSessionID */
}
/**
* Read a client monitor data block (TS_UD_CS_MONITOR).\n
* @msdn{dd305336}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_monitor_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 index;
UINT32 flags;
UINT32 monitorCount;
UINT32 left, top, right, bottom;
rdpSettings* settings = mcs->settings;
if (blockLength < 8)
return FALSE;
Stream_Read_UINT32(s, flags); /* flags */
Stream_Read_UINT32(s, monitorCount); /* monitorCount */
/* 2.2.1.3.6 Client Monitor Data -
* monitorCount (4 bytes): A 32-bit, unsigned integer. The number of display
* monitor definitions in the monitorDefArray field (the maximum allowed is 16).
*/
if (monitorCount > 16)
{
WLog_ERR(TAG, "announced monitors(%" PRIu32 ") exceed the 16 limit", monitorCount);
return FALSE;
}
if (monitorCount > settings->MonitorDefArraySize)
{
WLog_ERR(TAG, "too many announced monitors(%" PRIu32 "), clamping to %" PRIu32 "",
monitorCount, settings->MonitorDefArraySize);
monitorCount = settings->MonitorDefArraySize;
}
if ((UINT32)((blockLength - 8) / 20) < monitorCount)
return FALSE;
settings->MonitorCount = monitorCount;
for (index = 0; index < monitorCount; index++)
{
Stream_Read_UINT32(s, left); /* left */
Stream_Read_UINT32(s, top); /* top */
Stream_Read_UINT32(s, right); /* right */
Stream_Read_UINT32(s, bottom); /* bottom */
Stream_Read_UINT32(s, flags); /* flags */
settings->MonitorDefArray[index].x = left;
settings->MonitorDefArray[index].y = top;
settings->MonitorDefArray[index].width = right - left + 1;
settings->MonitorDefArray[index].height = bottom - top + 1;
settings->MonitorDefArray[index].is_primary = (flags & MONITOR_PRIMARY);
}
return TRUE;
}
/**
* Write a client monitor data block (TS_UD_CS_MONITOR).\n
* @msdn{dd305336}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_write_client_monitor_data(wStream* s, rdpMcs* mcs)
{
UINT32 i;
UINT16 length;
UINT32 left, top, right, bottom, flags;
INT32 baseX = 0, baseY = 0;
rdpSettings* settings = mcs->settings;
if (settings->MonitorCount > 1)
{
length = (20 * settings->MonitorCount) + 12;
if (!Stream_EnsureRemainingCapacity(s, length))
return FALSE;
gcc_write_user_data_header(s, CS_MONITOR, length);
Stream_Write_UINT32(s, 0); /* flags */
Stream_Write_UINT32(s, settings->MonitorCount); /* monitorCount */
/* first pass to get the primary monitor coordinates (it is supposed to be
* in (0,0) */
for (i = 0; i < settings->MonitorCount; i++)
{
if (settings->MonitorDefArray[i].is_primary)
{
baseX = settings->MonitorDefArray[i].x;
baseY = settings->MonitorDefArray[i].y;
break;
}
}
for (i = 0; i < settings->MonitorCount; i++)
{
left = settings->MonitorDefArray[i].x - baseX;
top = settings->MonitorDefArray[i].y - baseY;
right = left + settings->MonitorDefArray[i].width - 1;
bottom = top + settings->MonitorDefArray[i].height - 1;
flags = settings->MonitorDefArray[i].is_primary ? MONITOR_PRIMARY : 0;
Stream_Write_UINT32(s, left); /* left */
Stream_Write_UINT32(s, top); /* top */
Stream_Write_UINT32(s, right); /* right */
Stream_Write_UINT32(s, bottom); /* bottom */
Stream_Write_UINT32(s, flags); /* flags */
}
}
return TRUE;
}
BOOL gcc_read_client_monitor_extended_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 index;
UINT32 flags;
UINT32 monitorCount;
UINT32 monitorAttributeSize;
rdpSettings* settings = mcs->settings;
if (blockLength < 12)
return FALSE;
Stream_Read_UINT32(s, flags); /* flags */
Stream_Read_UINT32(s, monitorAttributeSize); /* monitorAttributeSize */
Stream_Read_UINT32(s, monitorCount); /* monitorCount */
if (monitorAttributeSize != 20)
return FALSE;
if ((blockLength - 12) / monitorAttributeSize < monitorCount)
return FALSE;
if (settings->MonitorCount != monitorCount)
return FALSE;
settings->HasMonitorAttributes = TRUE;
for (index = 0; index < monitorCount; index++)
{
Stream_Read_UINT32(
s, settings->MonitorDefArray[index].attributes.physicalWidth); /* physicalWidth */
Stream_Read_UINT32(
s, settings->MonitorDefArray[index].attributes.physicalHeight); /* physicalHeight */
Stream_Read_UINT32(
s, settings->MonitorDefArray[index].attributes.orientation); /* orientation */
Stream_Read_UINT32(s, settings->MonitorDefArray[index]
.attributes.desktopScaleFactor); /* desktopScaleFactor */
Stream_Read_UINT32(
s,
settings->MonitorDefArray[index].attributes.deviceScaleFactor); /* deviceScaleFactor */
}
return TRUE;
}
BOOL gcc_write_client_monitor_extended_data(wStream* s, rdpMcs* mcs)
{
UINT32 i;
UINT16 length;
rdpSettings* settings = mcs->settings;
if (settings->HasMonitorAttributes)
{
length = (20 * settings->MonitorCount) + 16;
if (!Stream_EnsureRemainingCapacity(s, length))
return FALSE;
gcc_write_user_data_header(s, CS_MONITOR_EX, length);
Stream_Write_UINT32(s, 0); /* flags */
Stream_Write_UINT32(s, 20); /* monitorAttributeSize */
Stream_Write_UINT32(s, settings->MonitorCount); /* monitorCount */
for (i = 0; i < settings->MonitorCount; i++)
{
Stream_Write_UINT32(
s, settings->MonitorDefArray[i].attributes.physicalWidth); /* physicalWidth */
Stream_Write_UINT32(
s, settings->MonitorDefArray[i].attributes.physicalHeight); /* physicalHeight */
Stream_Write_UINT32(
s, settings->MonitorDefArray[i].attributes.orientation); /* orientation */
Stream_Write_UINT32(s, settings->MonitorDefArray[i]
.attributes.desktopScaleFactor); /* desktopScaleFactor */
Stream_Write_UINT32(
s,
settings->MonitorDefArray[i].attributes.deviceScaleFactor); /* deviceScaleFactor */
}
}
return TRUE;
}
/**
* Read a client message channel data block (TS_UD_CS_MCS_MSGCHANNEL).\n
* @msdn{jj217627}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_message_channel_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 flags;
if (blockLength < 4)
return FALSE;
Stream_Read_UINT32(s, flags);
mcs->messageChannelId = mcs->baseChannelId++;
return TRUE;
}
/**
* Write a client message channel data block (TS_UD_CS_MCS_MSGCHANNEL).\n
* @msdn{jj217627}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_message_channel_data(wStream* s, rdpMcs* mcs)
{
rdpSettings* settings = mcs->settings;
if (settings->NetworkAutoDetect || settings->SupportHeartbeatPdu ||
settings->SupportMultitransport)
{
gcc_write_user_data_header(s, CS_MCS_MSGCHANNEL, 8);
Stream_Write_UINT32(s, 0); /* flags */
}
}
BOOL gcc_read_server_message_channel_data(wStream* s, rdpMcs* mcs)
{
UINT16 MCSChannelId;
if (Stream_GetRemainingLength(s) < 2)
return FALSE;
Stream_Read_UINT16(s, MCSChannelId); /* MCSChannelId */
/* Save the MCS message channel id */
mcs->messageChannelId = MCSChannelId;
return TRUE;
}
BOOL gcc_write_server_message_channel_data(wStream* s, rdpMcs* mcs)
{
if (mcs->messageChannelId == 0)
return TRUE;
if (!Stream_EnsureRemainingCapacity(s, 2 + 4))
return FALSE;
gcc_write_user_data_header(s, SC_MCS_MSGCHANNEL, 6);
Stream_Write_UINT16(s, mcs->messageChannelId); /* mcsChannelId (2 bytes) */
return TRUE;
}
/**
* Read a client multitransport channel data block (TS_UD_CS_MULTITRANSPORT).\n
* @msdn{jj217498}
* @param s stream
* @param settings rdp settings
*/
BOOL gcc_read_client_multitransport_channel_data(wStream* s, rdpMcs* mcs, UINT16 blockLength)
{
UINT32 flags;
if (blockLength < 4)
return FALSE;
Stream_Read_UINT32(s, flags);
return TRUE;
}
/**
* Write a client multitransport channel data block (TS_UD_CS_MULTITRANSPORT).\n
* @msdn{jj217498}
* @param s stream
* @param settings rdp settings
*/
void gcc_write_client_multitransport_channel_data(wStream* s, rdpMcs* mcs)
{
rdpSettings* settings = mcs->settings;
gcc_write_user_data_header(s, CS_MULTITRANSPORT, 8);
Stream_Write_UINT32(s, settings->MultitransportFlags); /* flags */
}
BOOL gcc_read_server_multitransport_channel_data(wStream* s, rdpMcs* mcs)
{
UINT32 flags;
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT32(s, flags); /* flags */
return TRUE;
}
void gcc_write_server_multitransport_channel_data(wStream* s, rdpMcs* mcs)
{
UINT32 flags = 0;
gcc_write_user_data_header(s, SC_MULTITRANSPORT, 8);
Stream_Write_UINT32(s, flags); /* flags (4 bytes) */
}