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packetforge-ng [2007/01/26 22:10]
darkaudax
packetforge-ng [2010/08/22 20:59] (current)
mister_x update "Usage" and fixed "mode" rendering
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 ====== Packetforge-ng ====== ====== Packetforge-ng ======
- 
  
  
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 The purpose of packetforge-ng is to create encrypted packets that can subsequently be used for injection. You may create various types of packets such as arp requests, UDP, ICMP and custom packets.  The most common use is to create ARP requests for subsequent injection. The purpose of packetforge-ng is to create encrypted packets that can subsequently be used for injection. You may create various types of packets such as arp requests, UDP, ICMP and custom packets.  The most common use is to create ARP requests for subsequent injection.
  
-To create an encrypted packet, you must have a PRGA (pseudo random genration algorithm) file. This is used to encrypt the packet you create.  This  is typically obtained from [[aireplay-ng]] [[korek_chopchop]] or [[fragmentation]] attacks.+To create an encrypted packet, you must have a PRGA (pseudo random genration algorithm) file. This is used to encrypt the packet you create.  This  is typically obtained from [[aireplay-ng]] [[korek_chopchop|chopchop]] or [[fragmentation]] attacks.
  
 ===== Usage ===== ===== Usage =====
 Usage: packetforge-ng <mode> <options> Usage: packetforge-ng <mode> <options>
  
-====Forge options:====+====Forge options====
  
       *-p <fctrl>     : set frame control word (hex)       *-p <fctrl>     : set frame control word (hex)
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       *-e             : disables WEP encryption       *-e             : disables WEP encryption
       *-k <ip[:port]> : set Destination IP [Port]       *-k <ip[:port]> : set Destination IP [Port]
-      *-l <ip[:port]> : set Source      IP [Port]+      *-l <ip[:port]> : set Source      IP [Port] (Dash lowercase letter L)
       *-t ttl         : set Time To Live       *-t ttl         : set Time To Live
       *-w <file>      : write packet to this pcap file       *-w <file>      : write packet to this pcap file
  
-====Source options:====+====Source options====
  
       *-r <file>      : read packet from this raw file       *-r <file>      : read packet from this raw file
       *-y <file>      : read PRGA from this file       *-y <file>      : read PRGA from this file
  
-====Modes:====+====Modes ==== 
 + 
 +      *-''''-arp          : forge an ARP packet    (-0) 
 +      *-''''-udp          : forge an UDP packet    (-1) 
 +      *-''''-icmp         : forge an ICMP packet   (-2) 
 +      *-''''-null         : build a null packet (-3) 
 +      *-''''-custom       : build a custom packet  (-9)
  
-      *--arp          : forge an ARP packet    (-0) 
-      *--udp          : forge an UDP packet    (-1) 
-      *--icmp         : forge an ICMP packet   (-2) 
-      *--custom       : build a custom packet  (-9) 
  
 ===== Usage Example ===== ===== Usage Example =====
  
 +==== Generating an arp request packet ====
 Here is an example of how to generate an arp request packet. Here is an example of how to generate an arp request packet.
  
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   *-a 00:14:6C:7E:40:80 is the Access Point MAC address   *-a 00:14:6C:7E:40:80 is the Access Point MAC address
   *-h 00:0F:B5:AB:CB:9D is the source MAC address you wish to use   *-h 00:0F:B5:AB:CB:9D is the source MAC address you wish to use
-  *-k 255.255.255.255 is the destination IP.  IE In an arp it is the "Who has this IP" +  *-k 192.168.1.100 is the destination IP.  IE In an arp it is the "Who has this IP" 
-  *-l 255.255.255.255 is the source IP.  IE In an arp is the "Tells this IP"+  *-l 192.168.1.is the source IP.  IE In an arp it is the "Tell this IP"
   *-y fragment-0124-161129.xor   *-y fragment-0124-161129.xor
   *-w arp-packet   *-w arp-packet
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   Saving chosen packet in replay_src-0124-163529.cap   Saving chosen packet in replay_src-0124-163529.cap
   You should also start airodump-ng to capture replies.   You should also start airodump-ng to capture replies.
- +  End of file.
-End of file.+
  
 By entering "y" above, the packet you created with packetforge-ng is then injected. By entering "y" above, the packet you created with packetforge-ng is then injected.
 +
 +
 +==== Generating a null packet ====
 +
 +This option allows you to generate LLC null packets.  These are the smallest possible packets and contain no data.  The switch "-s" is used to manually set the size of the packet.  This a simple way to generate small packets for injection.
 +
 +Remember that the size value (-s) defines the absolute size of an unencrypted packet, so you need to add 8 bytes to get its final length after encrypting it (4 bytes for iv+idx and 4 bytes for icv). This value also includes the 802.11 header with a length of 24bytes.
 +
 +The command is:
 +
 +   packetforge-ng --null -s 42 -a BSSID -h SMAC -w short-packet.cap -y fragment.xor
 +
 +Where:
 +  * --null means generate a LLC null packet (requires double dash).
 +  * -s 42 specifies the packet length to be generated.
 +  * -a BSSID is the MAC address of the access point.
 +  * -h SMAC is the source MAC address of the packet to be generated.
 +  * -w short-packet.cap is the name of the output file.
 +  * -y fragment.xor is the name of the file containing the PRGA.
 +
 +
 +==== Generating a custom packet ====
 +If you want to generate a customer packet, first create a packet with the tool of your choice.  This could be a specialized tool, a hex editor or even from a previous capture.  Then save it as a pcap file.  Following this, run the command:
 +
 +   packetforge-ng -9 -r input.cap -y keystream.xor -w output.cap
 +
 +Where:
 +  * -9 means generate a custom packet.
 +  * -r input.cap is the input file.
 +  * -y keystream.xor is the file containing the PRGA.
 +  * -w output.cap is the output file.
 +
 +When it runs, packetforge-ng will ask you which packet to use and then output the file.
 +
 +
 +
 +===== Usage Tips =====
 +
 +Most access points really don't care what IPs are used for the arp request.  So as a result you can use 255.255.255.255 for source and destination IPs.
 +
 +So the packetforge-ng command becomes:
 +   packetforge-ng -0 -a 00:14:6C:7E:40:80 -h 00:0F:B5:AB:CB:9D -k 255.255.255.255 -l 255.255.255.255 -y fragment-0124-161129.xor -w arp-request
 +
 +
 +===== Usage Troubleshooting =====
 +
 +==== Including both -j and -o flags ====
 +
 +A common mistake people make is to include either or both -j and -o flags and create invalid packets.  These flags adjust the FromDS and ToDS flages in the packet generated.  Unless you are doing something special and really know what you are doing, don't use them.  In general, they are not needed.
 +
 +
 +==== Error message "Mode already specified" ====
 +
 +This is commonly caused by using the number one (-1) instead of dash lowercase L (-l) in the command.
 +
 +Entering:
 +   packetforge-ng -0 -a 00:14:6C:7E:40:80 -h 00:09:5B:EC:EE:F2 -k 255.255.255.255 -1 255.255.255.255 -y 00:14:6C:7E:40:80-03-00-14-6C-7E-40-80.xor -w arp-request 
 +
 +Gives:
 +   Mode already specified.
 +   "packetforge-ng --help" for help.
 +
 +This because -1 (number one) was used instead of the correct -l (the letter ell).  So simply use "-l".
  
packetforge-ng.1169845837.txt.gz · Last modified: 2007/01/26 22:10 (external edit)