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Date: Tue, 23 Aug 2022 20:34:43 -0400
From: Matt Weir <cweir@...edu>
To: john-users@...ts.openwall.com
Subject: JtR Rules Questions
I've been playing around with John the Ripper rules, (this is a holdover
from the Crack Me if You Can competition), and I had some questions about
what I'm seeing and the best way to do things.
Note: The following observations are with John the Ripper
1.9.0-jumbo-1+bleeding-c80015001
As some further background, part of this investigation is into trying to
replicate the "random rule" (-g flag) option in Hashcat.
1) It doesn't seem like the delete first character '[' rule is working on
the command line:
echo "test" | john --pipe --stdout --rules=':['
Using default input encoding: UTF-8
test
1p 0:00:00:00 0.00% 1.515p/s test
Note, the delete last character rule ']' does work
echo "test" | john --pipe --stdout --rules=':]'
Using default input encoding: UTF-8
Enabling duplicate candidate password suppressor
tes
1p 0:00:00:00 0.00% 1.538p/s tes
2) With the rule preprocessor, is there an easy way to specify all
'special' characters? Trying to capture them while getting the escaping
correct is very difficult. Aka for alphanumeric I can
specify Az"[a-zA-Z0-9]". (Side note, if there is an easier way I'd be
interested in that). But how should I do that for all special characters,
or for that matter, all ASCII characters?
3) I notice that some commands play well within the rule preprocessor and
others do not. For example the following works:
echo "test" | john --pipe --stdout --rules=':[cul]'
Using default input encoding: UTF-8
Enabling duplicate candidate password suppressor
Test
TEST
test
3p 0:00:00:00 0.00% 4.225p/s test
But you can't seem to do an append in the rule preprocess. So for example:
echo "test" | john --pipe --stdout --rules=':[$0]'
Using default input encoding: UTF-8
Invalid rule in Command Line Rule at line 0: Unexpected end of rule $
This isn't so much a question vs. a comment I guess... To turn it into a
question, is there a list or set of rules that are "approved" to work in
the rule preprocessor
Thanks!
Matt / @Lakiw
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