Milestone 5: deliver embedded RDP sessions and lifecycle hardening
This commit is contained in:
Keith Smith
366
third_party/FreeRDP/winpr/libwinpr/utils/wlog/PacketMessage.c
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366
third_party/FreeRDP/winpr/libwinpr/utils/wlog/PacketMessage.c
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/**
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* WinPR: Windows Portable Runtime
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* WinPR Logger
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*
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* Copyright 2013 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Copyright 2015 Thincast Technologies GmbH
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* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <winpr/config.h>
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#include "wlog.h"
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#include "PacketMessage.h"
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#include <winpr/wtypes.h>
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#include <winpr/crt.h>
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#include <winpr/file.h>
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#include <winpr/stream.h>
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#include <winpr/sysinfo.h>
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#include "../../log.h"
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#define TAG WINPR_TAG("utils.wlog")
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static BOOL Pcap_Read_Header(wPcap* pcap, wPcapHeader* header)
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{
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return (pcap && pcap->fp && fread((void*)header, sizeof(wPcapHeader), 1, pcap->fp) == 1);
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}
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static BOOL Pcap_Write_Header(wPcap* pcap, wPcapHeader* header)
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{
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return (pcap && pcap->fp && fwrite((void*)header, sizeof(wPcapHeader), 1, pcap->fp) == 1);
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}
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static BOOL Pcap_Write_RecordHeader(wPcap* pcap, wPcapRecordHeader* record)
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{
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return (pcap && pcap->fp && fwrite((void*)record, sizeof(wPcapRecordHeader), 1, pcap->fp) == 1);
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}
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static BOOL Pcap_Write_RecordContent(wPcap* pcap, wPcapRecord* record)
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{
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return (pcap && pcap->fp && fwrite(record->data, record->length, 1, pcap->fp) == 1);
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}
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static BOOL Pcap_Write_Record(wPcap* pcap, wPcapRecord* record)
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{
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return Pcap_Write_RecordHeader(pcap, &record->header) && Pcap_Write_RecordContent(pcap, record);
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}
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wPcap* Pcap_Open(char* name, BOOL write)
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{
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wPcap* pcap = nullptr;
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FILE* pcap_fp = winpr_fopen(name, write ? "w+b" : "rb");
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if (!pcap_fp)
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{
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WLog_ERR(TAG, "opening pcap file");
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return nullptr;
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}
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pcap = (wPcap*)calloc(1, sizeof(wPcap));
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if (!pcap)
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goto out_fail;
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pcap->name = name;
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pcap->write = write;
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pcap->record_count = 0;
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pcap->fp = pcap_fp;
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if (write)
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{
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pcap->header.magic_number = PCAP_MAGIC_NUMBER;
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pcap->header.version_major = 2;
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pcap->header.version_minor = 4;
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pcap->header.thiszone = 0;
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pcap->header.sigfigs = 0;
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pcap->header.snaplen = 0xFFFFFFFF;
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pcap->header.network = 1; /* ethernet */
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if (!Pcap_Write_Header(pcap, &pcap->header))
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goto out_fail;
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}
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else
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{
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if (_fseeki64(pcap->fp, 0, SEEK_END) < 0)
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goto out_fail;
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pcap->file_size = (SSIZE_T)_ftelli64(pcap->fp);
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if (pcap->file_size < 0)
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goto out_fail;
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if (_fseeki64(pcap->fp, 0, SEEK_SET) < 0)
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goto out_fail;
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if (!Pcap_Read_Header(pcap, &pcap->header))
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goto out_fail;
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}
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return pcap;
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out_fail:
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if (pcap_fp)
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(void)fclose(pcap_fp);
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free(pcap);
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return nullptr;
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}
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void Pcap_Flush(wPcap* pcap)
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{
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if (!pcap || !pcap->fp)
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return;
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while (pcap->record)
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{
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if (!Pcap_Write_Record(pcap, pcap->record))
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return;
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pcap->record = pcap->record->next;
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}
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(void)fflush(pcap->fp);
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}
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void Pcap_Close(wPcap* pcap)
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{
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if (!pcap || !pcap->fp)
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return;
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Pcap_Flush(pcap);
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(void)fclose(pcap->fp);
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free(pcap);
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}
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static BOOL WLog_PacketMessage_Write_EthernetHeader(wPcap* pcap, wEthernetHeader* ethernet)
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{
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wStream* s = nullptr;
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wStream sbuffer = WINPR_C_ARRAY_INIT;
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BYTE buffer[14] = WINPR_C_ARRAY_INIT;
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BOOL ret = TRUE;
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if (!pcap || !pcap->fp || !ethernet)
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return FALSE;
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s = Stream_StaticInit(&sbuffer, buffer, sizeof(buffer));
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if (!s)
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return FALSE;
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Stream_Write(s, ethernet->Destination, 6);
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Stream_Write(s, ethernet->Source, 6);
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Stream_Write_UINT16_BE(s, ethernet->Type);
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if (fwrite(buffer, sizeof(buffer), 1, pcap->fp) != 1)
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ret = FALSE;
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return ret;
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}
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static UINT16 IPv4Checksum(const BYTE* ipv4, int length)
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{
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long checksum = 0;
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while (length > 1)
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{
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const UINT16 tmp16 = *((const UINT16*)ipv4);
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checksum += tmp16;
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length -= 2;
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ipv4 += 2;
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}
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if (length > 0)
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checksum += *ipv4;
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while (checksum >> 16)
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checksum = (checksum & 0xFFFF) + (checksum >> 16);
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return (UINT16)(~checksum);
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}
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static BOOL WLog_PacketMessage_Write_IPv4Header(wPcap* pcap, wIPv4Header* ipv4)
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{
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wStream* s = nullptr;
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wStream sbuffer = WINPR_C_ARRAY_INIT;
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BYTE buffer[20] = WINPR_C_ARRAY_INIT;
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int ret = TRUE;
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if (!pcap || !pcap->fp || !ipv4)
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return FALSE;
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s = Stream_StaticInit(&sbuffer, buffer, sizeof(buffer));
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if (!s)
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return FALSE;
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Stream_Write_UINT8(s, (BYTE)((ipv4->Version << 4) | ipv4->InternetHeaderLength));
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Stream_Write_UINT8(s, ipv4->TypeOfService);
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Stream_Write_UINT16_BE(s, ipv4->TotalLength);
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Stream_Write_UINT16_BE(s, ipv4->Identification);
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Stream_Write_UINT16_BE(s, (UINT16)((ipv4->InternetProtocolFlags << 13) | ipv4->FragmentOffset));
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Stream_Write_UINT8(s, ipv4->TimeToLive);
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Stream_Write_UINT8(s, ipv4->Protocol);
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Stream_Write_UINT16(s, ipv4->HeaderChecksum);
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Stream_Write_UINT32_BE(s, ipv4->SourceAddress);
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Stream_Write_UINT32_BE(s, ipv4->DestinationAddress);
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ipv4->HeaderChecksum = IPv4Checksum((BYTE*)buffer, 20);
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Stream_Rewind(s, 10);
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Stream_Write_UINT16(s, ipv4->HeaderChecksum);
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if (fwrite(buffer, sizeof(buffer), 1, pcap->fp) != 1)
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ret = FALSE;
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return ret;
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}
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static BOOL WLog_PacketMessage_Write_TcpHeader(wPcap* pcap, wTcpHeader* tcp)
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{
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wStream* s = nullptr;
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wStream sbuffer = WINPR_C_ARRAY_INIT;
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BYTE buffer[20] = WINPR_C_ARRAY_INIT;
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BOOL ret = TRUE;
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if (!pcap || !pcap->fp || !tcp)
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return FALSE;
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s = Stream_StaticInit(&sbuffer, buffer, sizeof(buffer));
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if (!s)
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return FALSE;
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Stream_Write_UINT16_BE(s, tcp->SourcePort);
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Stream_Write_UINT16_BE(s, tcp->DestinationPort);
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Stream_Write_UINT32_BE(s, tcp->SequenceNumber);
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Stream_Write_UINT32_BE(s, tcp->AcknowledgementNumber);
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Stream_Write_UINT8(s, (UINT8)((tcp->Offset << 4) | (tcp->Reserved & 0xF)));
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Stream_Write_UINT8(s, tcp->TcpFlags);
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Stream_Write_UINT16_BE(s, tcp->Window);
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Stream_Write_UINT16_BE(s, tcp->Checksum);
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Stream_Write_UINT16_BE(s, tcp->UrgentPointer);
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if (pcap->fp)
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{
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if (fwrite(buffer, sizeof(buffer), 1, pcap->fp) != 1)
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ret = FALSE;
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}
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return ret;
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}
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static UINT32 g_InboundSequenceNumber = 0;
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static UINT32 g_OutboundSequenceNumber = 0;
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BOOL WLog_PacketMessage_Write(wPcap* pcap, void* data, size_t length, DWORD flags)
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{
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wTcpHeader tcp;
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wIPv4Header ipv4;
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wPcapRecord record;
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wEthernetHeader ethernet;
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ethernet.Type = 0x0800;
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if (!pcap || !pcap->fp)
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return FALSE;
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if (flags & WLOG_PACKET_OUTBOUND)
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{
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/* 00:15:5D:01:64:04 */
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ethernet.Source[0] = 0x00;
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ethernet.Source[1] = 0x15;
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ethernet.Source[2] = 0x5D;
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ethernet.Source[3] = 0x01;
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ethernet.Source[4] = 0x64;
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ethernet.Source[5] = 0x04;
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/* 00:15:5D:01:64:01 */
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ethernet.Destination[0] = 0x00;
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ethernet.Destination[1] = 0x15;
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ethernet.Destination[2] = 0x5D;
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ethernet.Destination[3] = 0x01;
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ethernet.Destination[4] = 0x64;
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ethernet.Destination[5] = 0x01;
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}
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else
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{
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/* 00:15:5D:01:64:01 */
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ethernet.Source[0] = 0x00;
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ethernet.Source[1] = 0x15;
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ethernet.Source[2] = 0x5D;
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ethernet.Source[3] = 0x01;
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ethernet.Source[4] = 0x64;
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ethernet.Source[5] = 0x01;
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/* 00:15:5D:01:64:04 */
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ethernet.Destination[0] = 0x00;
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ethernet.Destination[1] = 0x15;
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ethernet.Destination[2] = 0x5D;
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ethernet.Destination[3] = 0x01;
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ethernet.Destination[4] = 0x64;
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ethernet.Destination[5] = 0x04;
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}
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ipv4.Version = 4;
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ipv4.InternetHeaderLength = 5;
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ipv4.TypeOfService = 0;
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ipv4.TotalLength = (UINT16)(length + 20 + 20);
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ipv4.Identification = 0;
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ipv4.InternetProtocolFlags = 0x02;
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ipv4.FragmentOffset = 0;
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ipv4.TimeToLive = 128;
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ipv4.Protocol = 6; /* TCP */
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ipv4.HeaderChecksum = 0;
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if (flags & WLOG_PACKET_OUTBOUND)
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{
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ipv4.SourceAddress = 0xC0A80196; /* 192.168.1.150 */
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ipv4.DestinationAddress = 0x4A7D64C8; /* 74.125.100.200 */
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}
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else
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{
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ipv4.SourceAddress = 0x4A7D64C8; /* 74.125.100.200 */
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ipv4.DestinationAddress = 0xC0A80196; /* 192.168.1.150 */
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}
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tcp.SourcePort = 3389;
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tcp.DestinationPort = 3389;
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if (flags & WLOG_PACKET_OUTBOUND)
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{
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tcp.SequenceNumber = g_OutboundSequenceNumber;
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tcp.AcknowledgementNumber = g_InboundSequenceNumber;
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WINPR_ASSERT(length + g_OutboundSequenceNumber <= UINT32_MAX);
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g_OutboundSequenceNumber += WINPR_ASSERTING_INT_CAST(uint32_t, length);
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}
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else
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{
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tcp.SequenceNumber = g_InboundSequenceNumber;
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tcp.AcknowledgementNumber = g_OutboundSequenceNumber;
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WINPR_ASSERT(length + g_InboundSequenceNumber <= UINT32_MAX);
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g_InboundSequenceNumber += WINPR_ASSERTING_INT_CAST(uint32_t, length);
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}
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tcp.Offset = 5;
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tcp.Reserved = 0;
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tcp.TcpFlags = 0x0018;
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tcp.Window = 0x7FFF;
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tcp.Checksum = 0;
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tcp.UrgentPointer = 0;
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record.data = data;
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record.length = length;
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const size_t offset = 14 + 20 + 20;
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WINPR_ASSERT(record.length <= UINT32_MAX - offset);
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const uint32_t rloff = WINPR_ASSERTING_INT_CAST(uint32_t, record.length + offset);
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record.header.incl_len = rloff;
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record.header.orig_len = rloff;
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record.next = nullptr;
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UINT64 ns = winpr_GetUnixTimeNS();
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record.header.ts_sec = (UINT32)WINPR_TIME_NS_TO_S(ns);
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record.header.ts_usec = WINPR_TIME_NS_REM_US(ns);
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if (!Pcap_Write_RecordHeader(pcap, &record.header) ||
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!WLog_PacketMessage_Write_EthernetHeader(pcap, ðernet) ||
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!WLog_PacketMessage_Write_IPv4Header(pcap, &ipv4) ||
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!WLog_PacketMessage_Write_TcpHeader(pcap, &tcp) || !Pcap_Write_RecordContent(pcap, &record))
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return FALSE;
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(void)fflush(pcap->fp);
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return TRUE;
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}
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