Crack Htpasswd John The Ripper Linux

John the Ripper is a favourite password cracking tool of many pentesters. There is plenty of documentation about its command line options.

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Cracking Linux Passwords With John The Ripper

I’ve encountered the following problems using John the Ripper. These are not problems with the tool itself, but inherent problems with pentesting and password cracking in general.

Sep 30, 2019 1)Cracking Linux passwords. In Linux, the passwords are stored in the shadow file. If you have been using Linux for a while, you will know it. This file is hashed and secured. Also, you cannot directly see the files. But with john the ripper you can easily crack the password and get access to the Linux. John is a state of the art offline password cracking tool. John was better known as John The Ripper(JTR) combines many forms of password crackers into one single tool. It automatically detects the type of password & tries to crack them with either bruteforceing the encrypted hash or by using a dictionary attack on it.

Sometimes I stumble across hashes on a pentest, but don’t recognise the format, don’t know if it’s supported by john, or whether there are multiple “–format” options I should try.
The hashes you collect on a pentest sometimes need munging into a different format… but what’s the format john is expecting?
John will occasionally recognise your hashes as the wrong type (e.g. “Raw MD5″ as “LM DES”). This is inevitable because some hashes look identical.
Sometimes I gain access to a system, but can’t recall how to recover the password hashes for that particular application / OS.

These problems can all be sorted with a bit of googling or grepping through the john source code. I thought it might be helpful to compile a cheat sheet to reduce the amount of time I spend grepping and googling.

In the first release of this page I’ve:

Copied example hashes out of the source code for most supported hash types.
Provided examples of what your hashes.txt file might look like (though I’m sure other variations are supported that aren’t covered here yet).
For each example hash I’ve stated whether it will be automatically recognised by john, or whether you’ll have to use the “–format” option (in which case I’ve included which –format option you need)

I haven’t yet done the following:

Added reminders on how hashes can be collected.
Added information on how to munge the hashes into a format supported by john.

This sheet was originally based on john-1.7.8-jumbo-5. Changes in supported hashes or hash formats since then may not be reflected on this page.

afs – Kerberos AFS DES

Supported Hash Formats

bfegg – Eggdrop

Supported Hash Formats

bf – OpenBSD Blowfish

Supported Hash Formats

bsdi – BSDI DES

Supported Hash Formats

crypt – generic crypt(3)

Supported Hash Formats

des – Traditional DES

Supported Hash Formats

dmd5 – DIGEST-MD5

Supported Hash Formats

TODO: No working example yet.

dominosec – More Secure Internet Password

Supported Hash Formats

<none> – EPiServer SID Hashes

Supported Hash Formats

hdaa – HTTP Digest access authentication

Supported Hash Formats

hmac-md5 – HMAC MD5

Supported Hash Formats

hmailserver – hmailserver