mirror of
https://github.com/unrealircd/unrealircd.git
synced 2026-07-05 07:53:13 +02:00
griever
67059bd3ae
cloak keys to break ipv4 IPs. ip6 ips and hostnames are too ambiguous to be susceptable. #define COMPAT_BETA4_KEYS undoes this fix, and is required for ipv4 bans to be interoperable between pre-beta4 and post-beta4 servers. This should be defined on all win32 compiles at least until the first rc or final for 3.2
298 lines
11 KiB
C
298 lines
11 KiB
C
/************************************************************************
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* Unreal Internet Relay Chat Daemon, src/cloak.c
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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#ifdef lint
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static char sccxid[] = "@(#)cloak.c 9.00 7/12/99 UnrealIRCd";
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#endif
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*/
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#include "struct.h"
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#include "common.h"
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#include "sys.h"
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#include "numeric.h"
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#include "msg.h"
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#include "ircsprintf.h"
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#include "channel.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include "h.h"
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#undef KEY
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#undef KEY2
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#undef KEY3
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#define KEY CLOAK_KEY1
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#define KEY2 CLOAK_KEY2
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#define KEY3 CLOAK_KEY3
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#define POW_8 256L
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#define POW_16 65536L
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#define POW_32 4294967296L
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/* The implementation here was originally done by Gary S. Brown. I have
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borrowed the tables directly, and made some minor changes to the
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crc32-function (including changing the interface). //ylo */
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/* ============================================================= */
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/* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */
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/* code or tables extracted from it, as desired without restriction. */
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/* */
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/* First, the polynomial itself and its table of feedback terms. The */
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/* polynomial is */
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/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
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/* */
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/* Note that we take it "backwards" and put the highest-order term in */
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/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
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/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
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/* the MSB being 1. */
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/* */
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/* Note that the usual hardware shift register implementation, which */
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/* is what we're using (we're merely optimizing it by doing eight-bit */
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/* chunks at a time) shifts bits into the lowest-order term. In our */
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/* implementation, that means shifting towards the right. Why do we */
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/* do it this way? Because the calculated CRC must be transmitted in */
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/* order from highest-order term to lowest-order term. UARTs transmit */
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/* characters in order from LSB to MSB. By storing the CRC this way, */
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/* we hand it to the UART in the order low-byte to high-byte; the UART */
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/* sends each low-bit to hight-bit; and the result is transmission bit */
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/* by bit from highest- to lowest-order term without requiring any bit */
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/* shuffling on our part. Reception works similarly. */
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/* */
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/* The feedback terms table consists of 256, 32-bit entries. Notes: */
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/* */
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/* The table can be generated at runtime if desired; code to do so */
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/* is shown later. It might not be obvious, but the feedback */
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/* terms simply represent the results of eight shift/xor opera- */
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/* tions for all combinations of data and CRC register values. */
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/* */
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/* The values must be right-shifted by eight bits by the "updcrc" */
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/* logic; the shift must be unsigned (bring in zeroes). On some */
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/* hardware you could probably optimize the shift in assembler by */
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/* using byte-swap instructions. */
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/* polynomial $edb88320 */
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/* */
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/* -------------------------------------------------------------------- */
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static unsigned long crc32_tab[] = {
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0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
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0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
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0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
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0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
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0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
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0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
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0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
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0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
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0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
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0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
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0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
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0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
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0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
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0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
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0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
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0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
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0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
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0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
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0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
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0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
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0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
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0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
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0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
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0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
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0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
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0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
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0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
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0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
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0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
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0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
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0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
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0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
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0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
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0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
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0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
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0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
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0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
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0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
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0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
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0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
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0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
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0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
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0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
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0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
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0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
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0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
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0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
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0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
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0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
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0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
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0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
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0x2d02ef8dL
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};
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/* Return a 32-bit CRC of the contents of the buffer. */
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unsigned long crc32(const unsigned char *s, unsigned int len)
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{
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unsigned int i;
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unsigned long crc32val;
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crc32val = 0;
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for (i = 0; i < len; i ++)
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{
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crc32val =
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crc32_tab[(crc32val ^ s[i]) & 0xff] ^
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(crc32val >> 8);
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}
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return crc32val;
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}
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char *hidehost(char *host)
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{
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static char cloaked[512];
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static char h1[512];
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static char h2[4][4];
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static char h3[300];
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unsigned long l[8];
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int i;
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char *p;
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/* Find out what kind of host we're dealing with here */
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/* IPv6 ? */
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if (strchr(host, ':'))
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{
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/* Do IPv6 cloaking here */
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/* FIXME: what the hell to do with :FFFF:192.168.1.5?
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*/
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/*
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* a:b:c:d:e:f:g:h
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*
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* crc(a.b.c.d)
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* crc(a.b.c.d.e.f.g)
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* crc(a.b.c.d.e.f.g.h)
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*/
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sscanf(host, "%x:%x:%x:%x:%x:%x:%x:%x",
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&l[0], &l[1], &l[2], &l[3],
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&l[4], &l[5], &l[6], &l[7]);
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ircsprintf(h3, "%x:%x:%x:%x",
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l[0], l[1], l[2], l[3]);
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l[0] = crc32(h3, strlen(h3));
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ircsprintf(h3, "%x:%x:%x:%x:%x:%x:%x",
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l[0], l[1], l[2], l[3],
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l[4], l[5], l[6]);
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l[1] = crc32(h3, strlen(h3));
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l[2] = crc32(host, strlen(host));
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for (i = 0; i <= 2; i++)
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{
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l[i] = ((l[i] + KEY2) ^ KEY) ^ KEY3;
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l[i] <<= 2; l[i] >>= 2;
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}
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ircsprintf(cloaked, "%x:%x:%x:IP",
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l[2], l[1], l[0]);
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return cloaked;
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}
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/* Is this a IPv4 IP? */
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for (p = host; *p; p++)
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{
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if (!isdigit(*p) && !(*p == '.'))
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{
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break;
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}
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}
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if (!(*p))
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{
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/* Do IPv4 cloaking here */
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strcpy(h1, host);
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i = 0;
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for (i = 0, p = strtok(h1, "."); p && (i <= 3); p = strtok(NULL, "."), i++)
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{
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strncpy(h2[i], p, 4);
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}
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#ifndef COMPAT_BETA4_KEYS
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ircsprintf(h3, "%s.%s", h2[0], h2[1]);
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l[0] = ((crc32(h3, strlen(h3)) + KEY) ^ KEY2) ^ KEY3;
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ircsprintf(h3, "%s.%s.%s", h2[0], h2[1], h2[2]);
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l[1] = ((KEY2 + crc32(h3, strlen(h3))) ^ KEY3) ^ KEY;
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l[4] = crc32(host, strlen(host));
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l[2] = ((l[4] + KEY3) ^ KEY)^ KEY2;
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#else
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ircsprintf(h3, "%s.%s", h2[0], h2[1]);
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l[0] = ((crc32(h3, strlen(h3)) + KEY2) ^ KEY) ^ KEY3;
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ircsprintf(h3, "%s.%s.%s", h2[0], h2[1], h2[2]);
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l[1] = ((KEY2 + crc32(h3, strlen(h3))) ^ KEY3) ^ KEY;
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l[4] = crc32(host, strlen(host));
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l[2] = ((l[4] + KEY) ^ KEY3)^ KEY2;
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#endif
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l[2] <<= 2; l[2] >>= 2;
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l[0] <<= 1; l[0] >>= 1;
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ircsprintf(cloaked, "%X.%X.%X.IP", l[2], l[1], l[0]);
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return cloaked;
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}
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else
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{
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/* Normal host cloaking here
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*
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* Find first .<alpha>
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*/
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for (p = host; *p; p++)
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{
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if (*p == '.')
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{
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if (isalpha(*(p + 1)))
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break;
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}
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}
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l[0] = ((crc32(host, strlen(host)) + KEY2) ^ KEY)^ KEY3;
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l[0] <<= 2;
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l[0] >>= 2;
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p++;
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if (*p)
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sprintf(cloaked, "%s-%X.%s", hidden_host,
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l[0], p);
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else
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sprintf(cloaked, "%s-%X", hidden_host, l[0]);
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return cloaked;
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}
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/* Couldn't cloak, -WTF? */
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return NULL;
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}
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/* Regular user host */
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/* mode = 0, just use strncpyzt, 1 = Realloc new and return new pointer */
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char *make_virthost(char *curr, char *new, int mode)
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{
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char *mask;
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char *x;
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int i;
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if (curr == NULL)
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return (char *)NULL;
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mask = hidehost(curr);
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if (mode == 0)
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{
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strncpyzt(new, mask, HOSTLEN); /* */
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return NULL;
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}
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i = strlen(mask) + 1;
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if (new)
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MyFree(new);
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x = MyMalloc(i);
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strcpy(x, mask);
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return x;
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}
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