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Date: Sun, 17 Apr 2016 14:02:12 -0500
From: jfoug <jfoug@...nwall.net>
To: john-dev@...ts.openwall.com
Subject: New Feature: Calling external from rules
This is a 'talk it out' thread. I have opened a github issue also
(https://github.com/magnumripper/JohnTheRipper/issues/2121). Solar
mentioned this idea in another github thread, but in relation to the 'e'
rule being taken while he was thinking of using it to trigger a call to
an external script.
Here is the text from the new request issue on github:
This idea came from #2095
<https://github.com/magnumripper/JohnTheRipper/issues/2095>
https://github.com/magnumripper/JohnTheRipper/issues/2095
Solar: It makes me thinking what command character we'd (eventually)
use for executing an external mode function from a ruleset, though -
'e' could have stood for "external" - but perhaps this should in
fact be a separate topic
As for external being called as a rule, I really only see calling a
filter function to modify the word, or reject it.
As for the rule to use, these are already spoken for. Note: where there
are letters available of either case, there is a gap
|A cCdDeE f i kKlL M oOpPqQ rRsStTuUvV xXyYzZ { } [ ] () <> _ ' : / $ ^
# % @ ! = \ * + - . , 12 4 6|
So we can see we are getting pretty 'tight' on letters. However, for
calling an external function, could we view this as a 'spawn', and wrap
it in sh syntax? |`function`| ?
The ` is not used, and seems a safe bet as having to real meaning (other
than spawn meaning from the shell languages). That way, we could even
comment it could be a extern function or even a system spawn (Yes, I
know Solar will not agree to this security hole, but we can wish, lol).
So a rule such as:
|\]\]$[a-f0-9]$[ -~]c`corp_complexity`|
would chop last 2 letters, append a hex, then some other ASCII char,
then case the word, and then finally call the corp_complexity external
script which would accept or cause the final word to be dropped as not
meeting some corp standard, or perform some other task
-- Community volunteer for John the Ripper project.
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