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aion protocol analyses

JRSmile

By JRSmile,
in AutoIt Example Scripts

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JRSmile Universalist

JRSmile

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Hi there back in action and moved from WoW to aion.

attached you find my aion protocol analyses aproach.

the code doesn't to much it just shows the raw packets to and from the login and gameserver.

i did not manage to include decryption of the protocol, at least not yet.

problem is i know it is blowfish and xor crypted and the first packet has the blowfish secret. there is a lot of documentation out there at google and co.

but i can't figure out how to get into it.

if somebody with binary knowledge can help me with that i would give him a cold beer and a warm hug.

there is a lot of code from httpcap.au3 in it too.

to use the code you will have to download:

blowfish.au3

and winpcap udf

the rest of the includes is standart.

aion.au3

$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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JRSmile Universalist

JRSmile

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good news, stupid developer ...

as binaries hates me i need help :)

i have this packet structure:

<packet id="0x00" name="SM_INIT">

<part name="session id" type="d" />

<part name="protocol revision" type="d" />

<part name="RSA key" type="b" size="0x80" />

<part name="?" type="d" />

<part name="?" type="d" />

<part name="?" type="d" />

<part name="?" type="d" />

<part name="Blowfish key" type="b" size="0x10"/>

</packet>

and want it to translate in autoit, the packet ticks at the right time (so the if section is right) but i think the results are wrong:

If $tcpsrcport = 2106 And _PcapBinaryGetVal($aion_packet, 1, 1) = 194 And BinaryMid($aion_packet, 2, 1) = 0x00 Then ; SM_INIT 
$sessionid = _PcapBinaryGetVal($aion_packet, 3, 4) ; 0x4 
$protocolrevision = _PcapBinaryGetVal($aion_packet, 7, 4) ; d 
$RSAkey = BinaryMid($aion_packet, 11, 128) ; 0x80 
$BlowFishKey = BinaryMid($aion_packet, 144, 16) ; 0x10 
ConsoleWrite("SessionID: " & $sessionid & @CRLF) 
ConsoleWrite("Protocoll Revision: " & $protocolrevision & @CRLF) 
ConsoleWrite("RSA Key: " & $RSAkey & @CRLF) 
ConsoleWrite("Blowfish Key: " & $BlowFishKey & @CRLF)
EndIf

but something is wrong, can somebody tell me if i got the right conversion?

sample packet:

00 6C 7A 12 00 21 C6 00 00 82 77 47 65 8B D4 E6 .lz..!....wGe...
B4 91 38 D5 F9 35 8A 13 39 12 2A B2 76 13 27 8A ..8..5..9.*.v.'.
91 08 7C 9A 53 84 DD 5E C8 ED 99 2D 67 D1 F3 67 ..|.S..^...-g..g
AC 7E 9E 7E E0 A3 43 58 7E 3E 51 74 4F 78 6F C6 .~.~..CX~>QtOxo.
FB 6B 3A EF 31 6C 86 AE A7 B6 E9 AC B6 30 27 89 .k:.1l.......0'.
C1 0C C4 05 C0 F4 31 30 F1 37 1F 45 2C 8D 16 A3 ......10.7.E,...
17 D3 D1 91 23 B2 53 B3 D3 B6 C5 61 9F 25 60 80 ....#.S....a.%`.
C4 A7 A6 36 6A 93 79 1E 94 CB 7E 67 64 0A F7 B7 ...6j.y...~gd...
B1 95 B5 C8 49 84 27 1A 10 00 00 00 00 00 00 00 ....I.'.........
00 00 00 00 00 00 00 00 00 73 20 C1 85 E4 3B 7A .........s ...;z
13 6C 0B EF 6E E4 3B 7A 13 00 00 00 00 41 E2 4E .l..n.;z.....A.N
7C 62 16 5E E0 0F C1 F6 A5 1B 44 C0 DF C5 D7 E4 |b.^......D.....
$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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Authenticity Universalist

Authenticity

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The difference is how the data is stored:

Local $xData = "0x40302010"
ConsoleWrite("0x" & Hex(Binary(_PcapBinaryGetVal($xData, 1, 4))) & @CRLF)

Func _PcapBinaryGetVal($data,$offset,$bytes) 
    Local $val32=Dec(StringMid($data, 3+($offset-1)*2 ,$bytes*2))
    If $val32<0 Then return 2^32+$val32
    return $val32
EndFunc

If the dword is stored in little endian then the previous code should work.

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JRSmile Universalist

JRSmile

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The difference is how the data is stored:

Local $xData = "0x40302010"
ConsoleWrite("0x" & Hex(Binary(_PcapBinaryGetVal($xData, 1, 4))) & @CRLF)

Func _PcapBinaryGetVal($data,$offset,$bytes) 
    Local $val32=Dec(StringMid($data, 3+($offset-1)*2 ,$bytes*2))
    If $val32<0 Then return 2^32+$val32
    return $val32
EndFunc

If the dword is stored in little endian then the previous code should work.

the little indian thingie may do the trick thanks for your advice, i hope i can get the rest correct too.

$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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JRSmile Universalist

JRSmile

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just for my documentation,

probably other packet format:

1: 00   [0]
 4: AA BB CC DD     [4-7] SessionID
 4: 21 C6 00 00     [8-11] ProtoVer
128: RSA public key Modulus [12-139]
 16: GG shit?   [140-155]
 16: BF key     [156-171]
 1: 00  [172] ? end of packet?
 10: some trash??   [173-182]
 4: XOR key     [183-186]
$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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JRSmile Universalist

JRSmile

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the blowfish key for SM_INIT packet decryption, ( stays the same since 1.0 till now.)

#include <blowfish.au3>
#include <string.au3>
Global Const $STATIC_BLOWFISH_KEY = "0x6b60cb5b82ce90b1cc2b6c556c6c6c6c"

$aion_packet = "0xC20018B96772331BB7D6FCECD6CD42A5FF27AD2B1F34794A1EA4BD65A41BF000855B7D6D2E8A74F211DB17E42518109E7F042CAE7EA5CCDF335373D9AD63779F5B4021D4FD5049A0B3A792B5419690D2CA6C350894D4B84DFC0B5541E10C6396EA593661B26014FD7B26255C17FA6EEA7D821434C98BDD395FD4C5B7DA8F8CA7DCD05CF559D7490E5EE9EAE16F5630DA481CAE074ECE4F42307BCE368805AFFA4DA90DA89C979D527302BC8B1D825672AB203171A4A0DFB3B2E8C631C08B858613DB"
If BinaryMid($aion_packet, 2, 1) = 0x00 Then ; SM_INIT
    $aion_packet = BinaryMid($aion_packet,3)
    ConsoleWrite("Encrypted: " & $aion_packet & @CRLF)
    $aion_packet = Binary(Blowfish($STATIC_BLOWFISH_KEY, $aion_packet, 1))
    ConsoleWrite("Decrypted: " & $aion_packet & @CRLF)
    $sessionid = _PcapBinaryGetVal($aion_packet, 1, 4) ; 0x4
    $protocolrevision = _PcapBinaryGetVal($aion_packet, 5, 4) ; d
    $RSAkey = BinaryMid($aion_packet, 9, 128) ; 0x80
    $BlowFishKey = BinaryMid($aion_packet, 144, 16) ; 0x10
    ConsoleWrite("SessionID: " & $sessionid & @CRLF)
    ConsoleWrite("Protocoll Revision: " & $protocolrevision & @CRLF)
    ConsoleWrite("RSA Key: " & $RSAkey & @CRLF)
    ConsoleWrite("Blowfish Key: " & $BlowFishKey & @CRLF)
EndIf

Func _PcapBinaryGetVal($data,$offset,$bytes)
    Local $val32=Dec(StringMid($data, 3+($offset-1)*2 ,$bytes*2))
    If $val32<0 Then return 2^32+$val32
    return $val32
EndFunc

Func padd($txt, $len)
    Return $txt & StringTrimLeft(_StringRepeat(" ", $len), StringLen($txt))
EndFunc ;==>padd
$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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JRSmile Universalist

JRSmile

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GOOD news, got rid of the login server part, isn't necessary for reading gameserver packets.

i got this information from Himred developer of the aionwh sniffer:

____________________________________________________________________________________________________

Yes you DONT need to read login server packets .

The login server set up a session on NCSOFT servers and then all playing is done between client and game server port 7777 .

If you read what I said here:

http://www.l2wh.com/forum/showthread.php?t=2852

Every tricks are explained .

The values of X,Y and S and the decrypt algorithm can be found on aion emu decrypt.java file here:

http://my-svn.assembla.com/svn/aion-...ork/Crypt.java

Once you'll have the decryption function done.

Consider the incoming stream as:

2 bytes for length in clear:encrypted data

2 bytes for length in clear:encrypted data

2 bytes for length in clear:encrypted data

2 bytes for length in clear:encrypted data

...............

Once you decrypt encrypted data, the format of data is:

1 byte opcode

1 byte that define if from server or from client

1 byte checksum = ~opcode.

The rest is opcode packet dependant

So the code could looks like:

while(true)

{

data=GetDataFromNetwork(2);

lenght=256*data[1]+data[0];

encrypteDdata=GetDataFromNetwork(length)

GamePacket=Decrypt(encryptedData)

ProcessPacket(GamePacket)

}

function ProcessPacket(GamePacket)

{

Opcode=GamePacket[0];

CheckSum=GamePacket[2];

if(Opcode!=~CheckSum) return(ERROR);

switch(Opcode)

{

case SM_INVENTORY: Inventory(GamePacket)

case SM_DROP: Drop(GamePacket)

case SM_WAREHOUSE: WareHouse(GamePacket)

..........

}

Regards,

Himred

____________________________________________________________________________________________________

so for now i attached my cleaned aion.au3 (removed my login server stuff)

and my decryption.au3 on which im working currently.

ps: if anybody can help me converting the following java loop to autoit this would be great. (especially the 0xff makes no sense for me.

for(int i = 1; i < size; i++, arrayIndex++)
        {
            int curr = data[arrayIndex] & 0xff;
            data[arrayIndex] ^= (staticKey[i & 63] & 0xff) ^ (clientPacketKey[i & 7] & 0xff) ^ prev;
            prev = curr;
        }

Best regards,

JR.

aion.au3

decrypt.au3

$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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  • 2 weeks later...
JRSmile Universalist

JRSmile

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again a step in the right direction, i MAYBE got the decryption key correctly :) now if somebody has an idea for a fifo buffer because the packets i get have to be sumed together and the seperated by length offsets...

aion.au3

decrypt.au3

$a=StringSplit("547275737420796F757220546563686E6F6C75737421","")
For $b=1 To UBound($a)+(-1*-1*-1)step(2^4/8);&$b+=1*2/40*µ&Asc(4)
Assign("c",Eval("c")&Chr(Dec($a[$b]&$a[$b+1])));''Chr("a")&"HI"
Next ;time_U&r34d,ths,U-may=get$the&c.l.u.e;b3st-regards,JRSmile;
MsgBox(0x000000,"",Eval("c"));PiEs:d0nt+*b3.s4d.4ft3r.1st-try:-)
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damaged1 Seeker

damaged1

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Posted (edited)

again a step in the right direction, i MAYBE got the decryption key correctly ;) now if somebody has an idea for a fifo buffer because the packets i get have to be sumed together and the seperated by length offsets...

hmmm im interested in some infos from the AH too :evil:

ill check your source, maybe im able to help you.

greets from germany

PS:

checkout

http://aion-emu.com/index.php?board=6.0

http://aion-emu.com/index.php?PHPSESSID=427cd0e4dcf206d3394e13b0c1150d57&topic=1660.0

Edited by damaged1
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