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|
/* $Id: logic_tree.c,v 1.10 2001/10/20 15:23:55 fygrave Exp $ */
/*
** Copyright (C) 2001 Fyodor Yarochkin <fygrave@tigerteam.net>,
** Ofir Arkin <ofir@sys-security.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** All material for nonprofit, educational use only.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "xprobe.h"
int do_logic(struct sockaddr_in to) {
rpack_t *udp_res, *icmpecho_res, *icmpts_res, *icmpam_res,
*icmpir_res;
ssize_t hdr_len;
int retval = -1;
if ((udp_res = send_udp(to)) == NULL) {
fprintf(stderr, "Error while sending UDP query. Quiting\n");
return -1;
}
/* make some generic calculations */
hdr_len = (udp_res->ip->ip_hl<<2) + 8;
/* precedence bits check */
if (((udp_res->ip->ip_tos) & 0xc0) != 0) {
/* if our ip->tos was 0xf8 we would get:
0xd8 --> from linux boxes
0xf8 --> from hpux/aix/??
0xc0 --> from cisco (may utilize it later
*/
tree_message("Cisco IOS 11.x-12.x! Extreme Network Switches.Linux 2.0.x!2.2.x!2.4.x.");
/* received datagram size check */
if (ntohs(udp_res->ip->ip_len) != (hdr_len + UDP_LEN_ALL)) {
tree_message("Cisco IOS 11.x-12x! Extreme Network Switches.");
if (udp_checksum_ver(udp_res) == UDP_CKSUM_ZERO) {
fin_message("Extreme Network Switches.");
retval = 1;
} else {
fin_message("Cisco IOS 11.x-12.x");
retval = 2;
}
free_res(&udp_res);
return retval;
} else {
/* the whole datagram echo'ed */
tree_message("Linux kernel 2.0.x!2.2.x!2.4.x! Based.");
/* ttl test.. abit dodgy (would work precisely in LAN */
if (udp_res->ip->ip_ttl < 65) {
free_res(&udp_res);
fin_message("Linux kernel 2.0.x");
return 3;
}
tree_message("Linux kernel 2.2.x!2.4.x! Based.");
free_res(&udp_res);
/* do ICMP ECHO REQUEST test here */
if ((icmpecho_res = send_icmpecho_req(to)) == NULL) {
fprintf(stderr, "Error while sending ICMP echo request.");
fin_message("Linux kernel 2.2.x! 2.4.x! assumed.");
return 4;
}
tree_message("ICMP echo/echo reply are not filtered");
if (icmpecho_res->ip->ip_id == 0) {
fin_message("Linux 2.4.x kernel");
retval = 5;
} else {
if (icmpecho_res->ip->ip_off & htons(IP_DF)) {
fin_message("Linux 2.4.x kernel");
retval = 5;
} else {
fin_message("Linux 2.2.x/2.4.5+ kernel");
retval = 6;
}
}
free_res(&icmpecho_res);
return retval; /* linux type diag done here */
} /* endif echo'ed dgrm size" */
} else {
/* tos doesn't have 0xc0 then... */
/* amount of echo'ed data check */
switch(ntohs(udp_res->ip->ip_len) - hdr_len - sizeof(struct ip)) {
case 64:
tree_message("Sun Solaris 2.3-2.8! HP-UX 11.x!MacOS 7.x-9.x");
free_res(&udp_res);
if ((icmpts_res = send_icmpts_req(to)) == NULL) {
fin_message("HP-UX 11.x!MacOS 7.x-9.x (no ts response received)");
return 9;
} else {
free_res(&icmpts_res);
fin_message("Sun Solaris 2.3-2.8");
return 10;
}
/* UNREACH */
break;
case 8:
break;
default:
fin_message("3Com SuperStack II Switch SWNBBSI-CF,11.1.0.00S38\n"
"Nokia IPSO 3.2-2.3.1 releng 783-849\n"
"Ricoh Aficio AP4500 Network Laster Printer\n"
"Linux 2.0.x/2.2.x/2.4.x\n"
"Shiva AccessPort Bridge/Router Software V.2.1.0");
free_res(&udp_res);
return 7;
} /* switch (diff packlen */
/* other */
/* ip tocal length integrity check */
/* XXX: make sure we do it right
*/
switch (icmp_unreach_lencheck(udp_res)) {
case ICMPUNREACH_LEN_GT:
tree_message("IP total length field value is >20 bytes from the original");
tree_message("*** AIX!BSDI!NetBSD 1.1.x-1.2.x!MacOS X 1.0-1.2");
if (ip_checksum_ok(udp_res)) {
fin_message("AIX");
free_res(&udp_res);
return 26;
}
tree_message("BSDI. NetBSD 1.1.x-1.2.x! MacOS X 1.0-1.2");
if (udp_res->ip->ip_id != udp_res->orig_ip->ip_id) {
fin_message("Little endian BSDI/NetBSD 1.1.x-1.2.x! MacOS X 1.0-1.2");
free_res(&udp_res);
return 27;
} else {
fin_message("Big endian BSDI/NetBSD 1.1.x-1.2.x MacOS X 1.0-1.2");
free_res(&udp_res);
return 28;
}
/* UNREACH */
break;
case ICMPUNREACH_LEN_LS:
tree_message("IP total length field value is <20 bytes from the original");
tree_message("*** OpenBSD 2.6-2.9, Apollo Domain/OS SR 10.4 NFR IDS Appliance");
tree_message("*** Extreme Networks switch Network Systems Router NS6114 (NSC 6600 Series)");
tree_message("*** Cabletron Systems SSR 8000 Systems Software Version 3.1 B16");
switch(udp_checksum_ver(udp_res)) {
case UDP_CKSUM_ZERO:
fin_message("Extreme Networks switch Network Systems Router NS6114 (NSC 6600 Series)");
fin_message("Cabletron Systems SSR 8000 Systems Software Version 3.1 B16");
free_res(&udp_res);
return 22;
case UDP_CKSUM_BAD:
fin_message("NFR IDS Appliance");
free_res(&udp_res);
return 23;
case UDP_CKSUM_GOOD:
tree_message("OpenBSD 2.6-2.9, Apollo Domain/OS SR 10.4 NFR IDS Appliance");
break;
}
if (ip_checksum_ok(udp_res)) {
fin_message(" OpenBSD 2.6-2.9");
free_res(&udp_res);
return 24;
} else {
fin_message("Apollo Domain/OS SR 10.4 NFR IDS Appliance");
free_res(&udp_res);
return 25;
}
/* UNREACH */
break;
case ICMPUNREACH_LEN_OK:
tree_message("IP total length field value is OK");
if(frag_bits_flipped(udp_res)) {
if (frag_bits_flipped(udp_res) == FRAG_BITS_ZERO) {
tree_message("Frag bits are zeroed");
fin_message("ULTRIX");
free_res(&udp_res);
return 35;
}
tree_message("Frag bits are flipped");
tree_message("*** FreeBSD 2.2.x - 4.1!NetBSD");
if (ip_checksum_ok(udp_res)) {
fin_message("FreeBSD 2.2.x - 4.1");
free_res(&udp_res);
return 12;
} else {
fin_message("NetBSD");
free_res(&udp_res);
return 13;
}
} else {
/* frags are not flipped */
tree_message("Frag bits are OK");
if ((icmpecho_res = send_icmpecho_req(to)) == NULL) {
fprintf(stderr, "Error while sending ICMP echo request.\n");
/* XXX: very generic msg */
fin_message("Windows Based. Open/Net/FreeBSD/DG-UX/HP-UX 10.x etc");
free_res(&udp_res);
return 14;
}
if (icmpecho_res->icmp->icmp_code) {
tree_message("ICMP code !=0");
/* XXX: to be expanded! */
if (!(icmpecho_res->ip->ip_off & htons(IP_DF))) {
tree_message("DF bit in icmp echo response not echoed");
if (icmpecho_res->ip->ip_ttl < 129) {
fin_message("Novell (FreeBSD 4.3-current(?)");
free_res(&icmpecho_res);
free_res(&udp_res);
return 29;
} else {
fin_message("Ultrix!HPUX 10.20(?)");
free_res(&icmpecho_res);
free_res(&udp_res);
return 30;
}
} /* else */
tree_message("DF bit in icmp echo response is echoed");
if (!(udp_res->ip->ip_off & htons(IP_DF))) {
tree_message("DF bit in icmp unreach is not echoed");
tree_message("OpenBSD 2.1-2.3,2.4-2.5!NetBSD 1.5, 1.4.1, 1.4!IBM OS/390");
if (udp_checksum_ver(udp_res) ==
UDP_CKSUM_ZERO) {
fin_message("OpenBSD 2.1-2.3");
free_res(&udp_res);
free_res(&icmpecho_res);
return 31;
} else {
tree_message("OpenBSD 2.4-2.5!NetBSD"
" 1.5, 1.4.1, 1.4!IBM OS/390");
if (udp_res->ip->ip_ttl > 64) {
fin_message("OpenBSD 2.4-2.5!NetBSD 1.5, 1.4.1, 1.4");
free_res(&udp_res);
free_res(&icmpecho_res);
return 32;
}
fin_message("IBM OS/390");
free_res(&udp_res);
free_res(&icmpecho_res);
return 33;
}
}
free_res(&icmpecho_res);
if ((icmpir_res = send_icmpireq_req(to)) == NULL) {
fin_message("Unknown Unix (Accuracy dropped)");
free_res(&udp_res);
return 0;
/* XXX: yellow line here */
}
tree_message("OpenVMS!HPUX 10.x!DGUX!SunOS4.x");
if (((struct ip *)((char *)(udp_res->icmp) + 8))->ip_id !=
udp_res->orig_ip->ip_id) {
fin_message("OpenVMS with Digital TCP Services");
free_res(&icmpir_res);
free_res(&udp_res);
return 34;
}
tree_message("IP ID is ok");
tree_message("DGUX/HPUX 10.x/OpenVMS with "
"Process Software TCPWare!SunOS4.x");
if (!ip_checksum_ok(udp_res)) {
fin_message("HPUX 10.x");
free_res(&icmpir_res);
free_res(&udp_res);
return 35;
}
tree_message("DGUX/OpenVMS with Process Software TCPWare!SunOS4.x");
if (udp_checksum_ver(udp_res) == UDP_CKSUM_ZERO) {
tree_message("DGUX/Compaq Tru64!SunOS4.x");
if (udp_res->ip->ip_ttl > 64) {
fin_message("SunOS4.x");
free_res(&udp_res);
free_res(&icmpecho_res);
return 36;
}
fin_message("DGUX/Compaq Tru64");
free_res(&udp_res);
free_res(&icmpecho_res);
return 37;
}
free_res(&udp_res);
free_res(&icmpir_res);
fin_message("OpenVMS with Process Software TCPWare");
return 15;
} else {
tree_message("Microsoft Windows Family TCP stack");
if(icmpecho_res->ip->ip_ttl < 33) {
fin_message("Windows 95");
free_res(&icmpecho_res);
return 16;
}
tree_message("Other Windows-based OS (ttl: %d)",icmpecho_res->ip->ip_ttl);
if (!icmpecho_res->ip->ip_tos) {
free_res(&icmpecho_res);
fin_message("Windows 2k. SP1, SP2/Windows XP");
return 17;
}
free_res(&icmpecho_res);
tree_message("Other Windows-based OS (98/98SE/NTsp3-/NTsp4+)");
if ((icmpts_res = send_icmpts_req(to)) == NULL) {
tree_message("Windows NTsp3-!Windows NTsp4+");
if ((icmpam_res = send_icmpmaskreq_req(to)) == NULL) {
fin_message("Windows NTsp4+");
return 18;
} else {
free_res(&icmpam_res);
fin_message("Windows NTsp3-");
return 19;
}
} else {
tree_message("Windows 98/98SE/ME");
free_res(&icmpts_res);
if ((icmpam_res = send_icmpmaskreq_req(to)) == NULL) {
fin_message("Windows ME");
return 20;
} else {
fin_message("Windows 98/98SE");
return 21;
}
} /* if (send_icmpts_req */
/* NOTREACH */
}
} /* if(frag_flipped... */
/* NOTREACH */
} /* switch(icmp_unreach.. */
fin_message("UNKNOWN");
} /* else (tos) endif */
free_res(&udp_res);
return 1;
}
|
