Some of the more complicated password/hacking blocking tools will do the following.. Keep a running database of:

  • IP -> Username good auth
  • IP -> Username bad auth

  • Username -> Current session list


    • With these three time stamped pieces of information you can do the following:

  • Test for repeated usernames with bad auths from one IP, and tag the IP as a cracker for X minutes (you have to have a rolling target for this so you can set the weight limit high enough to get few false blocks -- meaning 5 bad user/pass combos with unique users in 30 seconds triggers a block while 5 bad auths over 5 minutes does not.)
  • Many same user bad auths with the same IP (or different as most password cracking software will use huge proxy lists to hide the source of the attack) can trigger a administrative lockout of the account -- You should give the user the ability to easily unlockout their account once every X minutes via another form or via customer support.
  • Test for multiple good auths from different IP addresses with unique session ids. This should take into account that the end user may have a few different computers live on the site at once -- but there is no reason to see 15 active sessions from 15 different IP addresses.

    Just make these test flexible enough to allow for normal allowed use of the site while catching blatant cracking attempts.


    -Waswas



    EDITED: Spelling mistakes fixed gogo dyslexia.

    In reply to Re: Password hacker killer by waswas-fng
    in thread Password hacker killer by belize

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