/** * FreeRDP: A Remote Desktop Protocol Implementation * T.124 Generic Conference Control (GCC) * * Copyright 2011 Marc-Andre Moreau * Copyright 2014 Norbert Federa * Copyright 2014 DI (FH) Martin Haimberger * * 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 #include #include #include #include #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 BOOL gcc_write_user_data_header(wStream* s, UINT16 type, UINT16 length); static BOOL 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, const rdpMcs* mcs); static BOOL gcc_read_client_security_data(wStream* s, rdpMcs* mcs, UINT16 blockLength); static BOOL gcc_write_client_security_data(wStream* s, const 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 BOOL gcc_write_client_network_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_read_server_network_data(wStream* s, rdpMcs* mcs); static BOOL gcc_write_server_network_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_write_client_cluster_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_read_client_monitor_data(wStream* s, rdpMcs* mcs, UINT16 blockLength); static BOOL gcc_write_client_monitor_data(wStream* s, const 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, const rdpMcs* mcs); static BOOL gcc_read_client_message_channel_data(wStream* s, rdpMcs* mcs, UINT16 blockLength); static BOOL gcc_write_client_message_channel_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_read_server_message_channel_data(wStream* s, rdpMcs* mcs); static BOOL gcc_write_server_message_channel_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_read_client_multitransport_channel_data(wStream* s, rdpMcs* mcs, UINT16 blockLength); static BOOL gcc_write_client_multitransport_channel_data(wStream* s, const rdpMcs* mcs); static BOOL gcc_read_server_multitransport_channel_data(wStream* s, rdpMcs* mcs); static BOOL gcc_write_server_multitransport_channel_data(wStream* s, const 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" */ static const BYTE t124_02_98_oid[6] = { 0, 0, 20, 124, 0, 1 }; static const BYTE h221_cs_key[4] = "Duca"; static const 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_CheckAndLogRequiredLength(TAG, 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 */ BOOL gcc_write_conference_create_request(wStream* s, wStream* userData) { /* ConnectData */ if (!per_write_choice(s, 0)) /* From Key select object (0) of type OBJECT_IDENTIFIER */ return FALSE; if (!per_write_object_identifier(s, t124_02_98_oid)) /* ITU-T T.124 (02/98) OBJECT_IDENTIFIER */ return FALSE; /* ConnectData::connectPDU (OCTET_STRING) */ if (!per_write_length(s, Stream_GetPosition(userData) + 14)) /* connectPDU length */ return FALSE; /* ConnectGCCPDU */ if (!per_write_choice(s, 0)) /* From ConnectGCCPDU select conferenceCreateRequest (0) of type ConferenceCreateRequest */ return FALSE; if (!per_write_selection(s, 0x08)) /* select optional userData from ConferenceCreateRequest */ return FALSE; /* ConferenceCreateRequest::conferenceName */ if (!per_write_numeric_string(s, (BYTE*)"1", 1, 1)) /* ConferenceName::numeric */ return FALSE; if (!per_write_padding(s, 1)) /* padding */ return FALSE; /* UserData (SET OF SEQUENCE) */ if (!per_write_number_of_sets(s, 1)) /* one set of UserData */ return FALSE; if (!per_write_choice(s, 0xC0)) /* UserData::value present + select h221NonStandard (1) */ return FALSE; /* h221NonStandard */ if (!per_write_octet_string(s, h221_cs_key, 4, 4)) /* h221NonStandard, client-to-server H.221 key, "Duca" */ return FALSE; /* userData::value (OCTET_STRING) */ return 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; } BOOL gcc_write_conference_create_response(wStream* s, wStream* userData) { /* ConnectData */ if (!per_write_choice(s, 0)) return FALSE; if (!per_write_object_identifier(s, t124_02_98_oid)) return FALSE; /* ConnectData::connectPDU (OCTET_STRING) */ /* This length MUST be ignored by the client according to [MS-RDPBCGR] */ if (!per_write_length(s, 0x2A)) return FALSE; /* ConnectGCCPDU */ if (!per_write_choice(s, 0x14)) return FALSE; /* ConferenceCreateResponse::nodeID (UserID) */ if (!per_write_integer16(s, 0x79F3, 1001)) return FALSE; /* ConferenceCreateResponse::tag (INTEGER) */ if (!per_write_integer(s, 1)) return FALSE; /* ConferenceCreateResponse::result (ENUMERATED) */ if (!per_write_enumerated(s, 0, MCS_Result_enum_length)) return FALSE; /* number of UserData sets */ if (!per_write_number_of_sets(s, 1)) return FALSE; /* UserData::value present + select h221NonStandard (1) */ if (!per_write_choice(s, 0xC0)) return FALSE; /* h221NonStandard */ if (!per_write_octet_string(s, h221_sc_key, 4, 4)) /* h221NonStandard, server-to-client H.221 key, "McDn" */ return FALSE; /* userData (OCTET_STRING) */ return 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_CheckAndLogRequiredLength(TAG, 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: %" PRIuz " Expected Offset: %" PRIuz, type, endPos, begPos + blockLength); } length -= blockLength; Stream_SetPosition(s, begPos + blockLength); } return TRUE; } BOOL gcc_write_client_data_blocks(wStream* s, rdpMcs* mcs) { rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!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)) return FALSE; /* extended client data supported */ if (settings->NegotiationFlags & EXTENDED_CLIENT_DATA_SUPPORTED) { if (settings->UseMultimon && !settings->SpanMonitors) { if (!gcc_write_client_monitor_data(s, mcs) || !gcc_write_client_monitor_extended_data(s, mcs)) return FALSE; } if (!gcc_write_client_message_channel_data(s, mcs) || !gcc_write_client_multitransport_channel_data(s, mcs)) return FALSE; } 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) || !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 subbuffer; 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); sub = Stream_StaticInit(&subbuffer, 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_CheckAndLogRequiredLength(TAG, s, 4)) return FALSE; Stream_Read_UINT16(s, *type); /* type */ Stream_Read_UINT16(s, *length); /* length */ if ((*length < 4) || (!Stream_CheckAndLogRequiredLength(TAG, 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 */ BOOL gcc_write_user_data_header(wStream* s, UINT16 type, UINT16 length) { if (!Stream_EnsureRemainingCapacity(s, 4 + length)) return FALSE; Stream_Write_UINT16(s, type); /* type */ Stream_Write_UINT16(s, length); /* length */ return TRUE; } /** * 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 strbuffer[65] = { 0 }; char* strptr = strbuffer; 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; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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, &strptr, ARRAYSIZE(strbuffer), NULL, NULL) < 1) { WLog_ERR(TAG, "failed to convert client host name"); return FALSE; } Stream_Seek(s, 32); freerdp_settings_set_string(settings, FreeRDP_ClientHostname, strbuffer); 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, &strptr, ARRAYSIZE(strbuffer), NULL, NULL) < 1) { WLog_ERR(TAG, "failed to convert the client product identifier"); return FALSE; } Stream_Seek(s, 64); /* clientDigProductId (64 bytes) */ freerdp_settings_set_string(settings, FreeRDP_ClientProductId, strbuffer); 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 */ BOOL 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; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!gcc_write_user_data_header(s, CS_CORE, 234)) return FALSE; 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; } if (!Stream_EnsureRemainingCapacity(s, 32 + 12 + 64 + 8)) return FALSE; 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; if (!Stream_EnsureRemainingCapacity(s, 6)) return FALSE; 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; } if (!Stream_EnsureRemainingCapacity(s, 64 + 24)) return FALSE; 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 */ return TRUE; } BOOL gcc_read_server_core_data(wStream* s, rdpMcs* mcs) { UINT32 serverVersion; UINT32 clientRequestedProtocols; UINT32 earlyCapabilityFlags; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!Stream_CheckAndLogRequiredLength(TAG, 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, const rdpMcs* mcs) { UINT32 earlyCapabilityFlags = 0; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!gcc_write_user_data_header(s, SC_CORE, 16)) return FALSE; 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) { rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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 */ BOOL gcc_write_client_security_data(wStream* s, const rdpMcs* mcs) { rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!gcc_write_user_data_header(s, CS_SECURITY, 12)) return FALSE; 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 */ } return TRUE; } BOOL gcc_read_server_security_data(wStream* s, rdpMcs* mcs) { const BYTE* data; UINT32 length; BOOL validCryptoConfig = FALSE; UINT32 serverEncryptionMethod; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!Stream_CheckAndLogRequiredLength(TAG, 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_CheckAndLogRequiredLength(TAG, 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_CheckAndLogRequiredLength(TAG, s, settings->ServerRandomLength)) return FALSE; /* serverRandom */ if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ServerRandom, NULL, settings->ServerRandomLength)) goto fail; Stream_Read(s, settings->ServerRandom, settings->ServerRandomLength); if (!Stream_CheckAndLogRequiredLength(TAG, s, settings->ServerCertificateLength)) goto fail; /* serverCertificate */ if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ServerCertificate, NULL, settings->ServerCertificateLength)) goto fail; Stream_Read(s, settings->ServerCertificate, settings->ServerCertificateLength); 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; size_t expLen = 0, keyLen, sigDataLen; BYTE encryptedSignature[TSSK_KEY_LENGTH]; BYTE signature[sizeof(initial_signature)]; UINT32 headerLen, serverRandomLen, serverCertLen, wPublicKeyBlobLen; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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 (!gcc_write_user_data_header(s, SC_SECURITY, headerLen)) return FALSE; 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 */ WINPR_ASSERT(keyLen > 0); WINPR_ASSERT(keyLen <= UINT32_MAX / 8); Stream_Write_UINT32(s, (UINT32)keyLen + 8); /* keylen */ Stream_Write_UINT32(s, (UINT32)keyLen * 8); /* bitlen */ Stream_Write_UINT32(s, (UINT32)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 */ rdpMcsChannel* channel = &mcs->channels[i]; Stream_Read(s, channel->Name, CHANNEL_NAME_LEN + 1); /* name (8 bytes) */ if (!memchr(channel->Name, 0, CHANNEL_NAME_LEN + 1)) { WLog_ERR( TAG, "protocol violation: received a static channel name with missing null-termination"); return FALSE; } Stream_Read_UINT32(s, channel->options); /* options (4 bytes) */ channel->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 */ BOOL gcc_write_client_network_data(wStream* s, const rdpMcs* mcs) { UINT32 i; UINT16 length; if (mcs->channelCount > 0) { length = mcs->channelCount * 12 + 8; if (!gcc_write_user_data_header(s, CS_NET, length)) return FALSE; Stream_Write_UINT32(s, mcs->channelCount); /* channelCount */ /* channelDefArray */ for (i = 0; i < mcs->channelCount; i++) { /* CHANNEL_DEF */ rdpMcsChannel* channel = &mcs->channels[i]; Stream_Write(s, channel->Name, CHANNEL_NAME_LEN + 1); /* name (8 bytes) */ Stream_Write_UINT32(s, channel->options); /* options (4 bytes) */ } } return TRUE; } BOOL gcc_read_server_network_data(wStream* s, rdpMcs* mcs) { int i; UINT16 channelId; UINT16 MCSChannelId; UINT16 channelCount; UINT16 parsedChannelCount; if (!Stream_CheckAndLogRequiredLength(TAG, 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_CheckAndLogRequiredLength(TAG, s, 2ull * channelCount)) return FALSE; for (i = 0; i < parsedChannelCount; i++) { rdpMcsChannel* channel = &mcs->channels[i]; Stream_Read_UINT16(s, channelId); /* channelId */ channel->ChannelId = channelId; } if (channelCount % 2 == 1) return Stream_SafeSeek(s, 2); /* padding */ return TRUE; } BOOL gcc_write_server_network_data(wStream* s, const rdpMcs* mcs) { UINT32 i; const size_t payloadLen = 8 + mcs->channelCount * 2 + (mcs->channelCount % 2 == 1 ? 2 : 0); if (!gcc_write_user_data_header(s, SC_NET, payloadLen)) return FALSE; Stream_Write_UINT16(s, MCS_GLOBAL_CHANNEL_ID); /* MCSChannelId */ Stream_Write_UINT16(s, mcs->channelCount); /* channelCount */ for (i = 0; i < mcs->channelCount; i++) { const rdpMcsChannel* channel = &mcs->channels[i]; Stream_Write_UINT16(s, channel->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; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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; settings->ConsoleSession = (redirectedSessionId == 0); } 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 */ BOOL gcc_write_client_cluster_data(wStream* s, const rdpMcs* mcs) { UINT32 flags; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!gcc_write_user_data_header(s, CS_CLUSTER, 12)) return FALSE; 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 */ return TRUE; } /** * 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; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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++) { rdpMonitor* current = &settings->MonitorDefArray[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 */ current->x = left; current->y = top; current->width = right - left + 1; current->height = bottom - top + 1; current->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, const rdpMcs* mcs) { UINT32 i; UINT16 length; INT32 baseX = 0, baseY = 0; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); WLog_DBG(TAG, "[%s] MonitorCount=%" PRIu32, __FUNCTION__, settings->MonitorCount); if (settings->MonitorCount > 1) { length = (20 * settings->MonitorCount) + 12; if (!gcc_write_user_data_header(s, CS_MONITOR, length)) return FALSE; 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++) { const rdpMonitor* current = &settings->MonitorDefArray[i]; if (current->is_primary) { baseX = current->x; baseY = current->y; break; } } for (i = 0; i < settings->MonitorCount; i++) { const rdpMonitor* current = &settings->MonitorDefArray[i]; const UINT32 left = current->x - baseX; const UINT32 top = current->y - baseY; const UINT32 right = left + current->width - 1; const UINT32 bottom = top + current->height - 1; const UINT32 flags = current->is_primary ? MONITOR_PRIMARY : 0; WLog_DBG(TAG, "[%s] Monitor[%" PRIu32 "]: top=%" PRIu32 ", left=%" PRIu32 ", bottom=%" PRIu32 ", right=%" PRIu32 ", flags" PRIu32, __FUNCTION__, i, top, left, bottom, right, flags); 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 */ } } WLog_DBG(TAG, "[%s] FINISHED", __FUNCTION__); return TRUE; } BOOL gcc_read_client_monitor_extended_data(wStream* s, rdpMcs* mcs, UINT16 blockLength) { UINT32 index; UINT32 flags; UINT32 monitorCount; UINT32 monitorAttributeSize; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(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++) { rdpMonitor* current = &settings->MonitorDefArray[index]; Stream_Read_UINT32(s, current->attributes.physicalWidth); /* physicalWidth */ Stream_Read_UINT32(s, current->attributes.physicalHeight); /* physicalHeight */ Stream_Read_UINT32(s, current->attributes.orientation); /* orientation */ Stream_Read_UINT32(s, current->attributes.desktopScaleFactor); /* desktopScaleFactor */ Stream_Read_UINT32(s, current->attributes.deviceScaleFactor); /* deviceScaleFactor */ } return TRUE; } BOOL gcc_write_client_monitor_extended_data(wStream* s, const rdpMcs* mcs) { UINT32 i; UINT16 length; rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (settings->HasMonitorAttributes) { length = (20 * settings->MonitorCount) + 16; if (!gcc_write_user_data_header(s, CS_MONITOR_EX, length)) return FALSE; 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++) { const rdpMonitor* current = &settings->MonitorDefArray[i]; Stream_Write_UINT32(s, current->attributes.physicalWidth); /* physicalWidth */ Stream_Write_UINT32(s, current->attributes.physicalHeight); /* physicalHeight */ Stream_Write_UINT32(s, current->attributes.orientation); /* orientation */ Stream_Write_UINT32(s, current->attributes.desktopScaleFactor); /* desktopScaleFactor */ Stream_Write_UINT32(s, current->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 */ BOOL gcc_write_client_message_channel_data(wStream* s, const rdpMcs* mcs) { rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (settings->NetworkAutoDetect || settings->SupportHeartbeatPdu || settings->SupportMultitransport) { if (!gcc_write_user_data_header(s, CS_MCS_MSGCHANNEL, 8)) return FALSE; Stream_Write_UINT32(s, 0); /* flags */ } return TRUE; } BOOL gcc_read_server_message_channel_data(wStream* s, rdpMcs* mcs) { UINT16 MCSChannelId; if (!Stream_CheckAndLogRequiredLength(TAG, 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, const rdpMcs* mcs) { if (mcs->messageChannelId == 0) return TRUE; if (!gcc_write_user_data_header(s, SC_MCS_MSGCHANNEL, 6)) return FALSE; 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 */ BOOL gcc_write_client_multitransport_channel_data(wStream* s, const rdpMcs* mcs) { rdpContext* context; rdpSettings* settings; WINPR_ASSERT(s); WINPR_ASSERT(mcs); context = transport_get_context(mcs->transport); WINPR_ASSERT(context); settings = context->settings; WINPR_ASSERT(settings); if (!gcc_write_user_data_header(s, CS_MULTITRANSPORT, 8)) return FALSE; Stream_Write_UINT32(s, settings->MultitransportFlags); /* flags */ return TRUE; } BOOL gcc_read_server_multitransport_channel_data(wStream* s, rdpMcs* mcs) { UINT32 flags; if (!Stream_CheckAndLogRequiredLength(TAG, s, 4)) return FALSE; Stream_Read_UINT32(s, flags); /* flags */ return TRUE; } BOOL gcc_write_server_multitransport_channel_data(wStream* s, const rdpMcs* mcs) { UINT32 flags = 0; if (!gcc_write_user_data_header(s, SC_MULTITRANSPORT, 8)) return FALSE; Stream_Write_UINT32(s, flags); /* flags (4 bytes) */ return TRUE; }