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John the Ripper | Password Cracker

John the Ripper is designed to be both feature-rich and fast. It combines several cracking modes in one program.

 #password Attacks

Warning:-You shall not misuse the information to gain unauthorised access. However you may try out these hacks on your own computer at your own risk. Performing hack attempts (without permission) on computers that you do not own is illegal.

John the ripper | Password Cracker

John the Ripper | Password Cracker

John the Ripper is designed to be both feature-rich and fast. It combines several cracking modes in one program and is fully configurable for your particular needs (you can even define a custom cracking mode using the built-in compiler supporting a subset of C). Also, John is available for several different platforms which enables you to use the same cracker everywhere (you can even continue a cracking session which you started on another platform). Out of the box, John supports (and autodetects) the following Unix crypt(3) hash types: traditional DES-based, “bigcrypt”, BSDI extended DES-based, FreeBSD MD5-based (also used on Linux and in Cisco IOS), and OpenBSD Blowfish-based (now also used on some Linux distributions and supported by recent versions of Solaris). 

Also supported out of the box are Kerberos/AFS and Windows LM (DES-based) hashes, as well as DES-based tripcodes. When running on Linux distributions with glibc 2.7+, John 1.7.6+ additionally supports (and autodetects) SHA-crypt hashes (which are actually used by recent versions of Fedora and Ubuntu), with optional OpenMP parallelization (requires GCC 4.2+, needs to be explicitly enabled at compile-time by uncommenting the proper OMPFLAGS line near the beginning of the Makefile). Similarly, when running on recent versions of Solaris, John 1.7.6+ supports and autodetects SHA-crypt and SunMD5 hashes, also with optional OpenMP parallelization (requires GCC 4.2+ or recent Sun Studio, needs to be explicitly enabled at compile-time by uncommenting the proper OMPFLAGS line near the beginning of the Makefile and at runtime by setting the OMP_NUM_THREADS environment variable to the desired number of threads). John the Ripper Pro adds support for Windows NTLM (MD4-based) and Mac OS X 10.4+ salted SHA-1 hashes. “Community enhanced” -jumbo versions add support for many more password hash types, including Windows NTLM (MD4-based), Mac OS X 10.4-10.6 salted SHA-1 hashes, Mac OS X 10.7 salted SHA-512 hashes, raw MD5 and SHA-1, arbitrary MD5-based “web application” password hash types, hashes used by SQL database servers (MySQL, MS SQL, Oracle) and by some LDAP servers, several hash types used on OpenVMS, password hashes of the Eggdrop IRC bot, and lots of other hash types, as well as many non-hashes such as OpenSSH private keys, S/Key skeykeys files, Kerberos TGTs, PDF files, ZIP (classic PKZIP and WinZip/AES) and RAR archives.

 Unlike older crackers, John normally does not use a crypt(3)-style routine. Instead, it has its own highly optimized modules for different hash types and processor architectures. Some of the algorithms used, such as bitslice DES, couldn’t have been implemented within the crypt(3) API; they require a more powerful interface such as the one used in John. Additionally, there are assembly language routines for several processor architectures, most importantly for x86-64 and x86 with SSE2.


#Tools included in the john package

1. mailer – Emails users who have had their passwords cracked:-

mailer – Emails users who have had their passwords cracked

2. john – John the Ripper password cracker:-

root@crackcodes:~# john
Created directory: /root/.john
John the Ripper 1.9.0-jumbo-1 OMP [linux-gnu 64-bit x86_64 AVX AC]
Copyright (c) 1996-2019 by Solar Designer and others
Homepage: http://www.openwall.com/john/

Usage: john [OPTIONS] [PASSWORD-FILES]
--single[=SECTION[,..]]    "single crack" mode, using default or named rules
--single=:rule[,..]        same, using "immediate" rule(s)
--wordlist[=FILE] --stdin  wordlist mode, read words from FILE or stdin
                  --pipe   like --stdin, but bulk reads, and allows rules
--loopback[=FILE]          like --wordlist, but extract words from a .pot file
--dupe-suppression         suppress all dupes in wordlist (and force preload)
--prince[=FILE]            PRINCE mode, read words from FILE
--encoding=NAME            input encoding (eg. UTF-8, ISO-8859-1). See also
                           doc/ENCODINGS and --list=hidden-options.
--rules[=SECTION[,..]]     enable word mangling rules (for wordlist or PRINCE
                           modes), using default or named rules
--rules=:rule[;..]]        same, using "immediate" rule(s)
--rules-stack=SECTION[,..] stacked rules, applied after regular rules or to
                           modes that otherwise don't support rules
--rules-stack=:rule[;..]   same, using "immediate" rule(s)
--incremental[=MODE]       "incremental" mode [using section MODE]
--mask[=MASK]              mask mode using MASK (or default from john.conf)
--markov[=OPTIONS]         "Markov" mode (see doc/MARKOV)
--external=MODE            external mode or word filter
--subsets[=CHARSET]        "subsets" mode (see doc/SUBSETS)
--stdout[=LENGTH]          just output candidate passwords [cut at LENGTH]
--restore[=NAME]           restore an interrupted session [called NAME]
--session=NAME             give a new session the NAME
--status[=NAME]            print status of a session [called NAME]
--make-charset=FILE        make a charset file. It will be overwritten
--show[=left]              show cracked passwords [if =left, then uncracked]
--test[=TIME]              run tests and benchmarks for TIME seconds each
--users=[-]LOGIN|UID[,..]  [do not] load this (these) user(s) only
--groups=[-]GID[,..]       load users [not] of this (these) group(s) only
--shells=[-]SHELL[,..]     load users with[out] this (these) shell(s) only
--salts=[-]COUNT[:MAX]     load salts with[out] COUNT [to MAX] hashes
--costs=[-]C[:M][,...]     load salts with[out] cost value Cn [to Mn]. For
                           tunable cost parameters, see doc/OPTIONS
--save-memory=LEVEL        enable memory saving, at LEVEL 1..3
--node=MIN[-MAX]/TOTAL     this node's number range out of TOTAL count
--fork=N                   fork N processes
--pot=NAME                 pot file to use
--list=WHAT                list capabilities, see --list=help or doc/OPTIONS
--format=NAME              force hash of type NAME. The supported formats can
                           be seen with --list=formats and --list=subformats

3. unafs – Script to warn users about their weak passwords:-
unafs

4. unshadow – Combines passwd and shadow files:-


5. unique – Removes duplicates from a wordlist:-

unique

#Usages:-

1.unshadow:-

Combine the provided passwd (passwd) and shadow (shadow)(shadow) and redirect them to a file (> unshadowed.txt):


2. John:-

Using a wordlist (–wordlist=/usr/share/john/password.lst), apply mangling rules (–rules) and attempt to crack the password hashes in the given file (unshadowed.txt):

root@crackcodes:~# john --wordlist=/usr/share/john/password.lst --rules unshadowed.txt
Warning: detected hash type "sha512crypt", but the string is also recognized as "crypt"
Use the "--format=crypt" option to force loading these as that type instead
Loaded 1 password hash (sha512crypt [64/64])
toor             (root)
guesses: 1  time: 0:00:00:07 DONE (Mon May 19 08:13:05 2014)  c/s: 482  trying: 1701d - andrew
Use the "--show" option to display all of the cracked passwords reliably

3.unique:-

Using verbose mode (-v), read a list of passwords (-inp=allwords.txt) and save only unique words to a file (uniques.txt):

root@crACKCODES:~# unique -v -inp=allwords.txt uniques.txt
Total lines read 6089 Unique lines written 5083Use the "--show" option to display all of the cracked passwords reliably

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Crackcodes.in: John the Ripper | Password Cracker
John the Ripper | Password Cracker
John the Ripper is designed to be both feature-rich and fast. It combines several cracking modes in one program.
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