- Crack Htpasswd John The Ripper Linux Command
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In this article we are going to show how we can crack /etc/shadow file using John the Ripper. It is common in CTF like events to somehow get access to the shadow file or part of it and having to crack it so you can get the password of a user.
Basic John Usage. Use John to begin the cracking with this command: $ john hashes-3.des.txt Loaded 10297 password hashes with 3741 different salts (descrypt, traditional crypt (3) DES 32/32) This simple command does the following: Detected there are 10,297 password hashes in the file and their salts. John the Ripper. John the Ripper is a great tool for cracking passwords using some famous brute for attacks like dictionary attack or custom wordlist attack etc. It is even used to crack the hashes or passwords for the zipped or compressed files and even locked files as well. It has many available options to crack hashes or passwords. To use John the Ripper.
![Cracking linux passwords with john the ripper Cracking linux passwords with john the ripper](/uploads/1/3/4/7/134733897/607025527.jpg)
The process involves two basic steps, the first is called unshadowing while the second is the cracking itself. Unshadowing is a process where we combine the
/etc/passwd
file along with the /etc/shadow
in order for John to be able to understand what we are feeding to it. Unshadow is a tool that handles this task and it is part of the John package. In order to unshadow the shadow file we need to also have the equivalent line from the passwd for the user of our interest. An example is the following:In order to unshadow to the two files we need to execute
Which will store in the unshadowed.txt file the following
Next and final step is to actually start the cracking with John. It is up to you which cracking method you will chose, though a bruteforcing using a wordlist is usually enough for CTFs. An example attack using a wordlist would be launched like below
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The result would be similar to the following picture
Where as we see John managed to crack the password of the user root as it was included in the wordlist used.
If you would like to print all the passwords John managed to crack you may run
If you would like to print all the passwords John managed to crack you may run
john --show unshadowed.txt
and you will get something like:Crack Htpasswd John The Ripper Linux Command
Conclusion
In this article we showed how John the Ripper can be used to crack the hashed password of a user that can be found in the /etc/shadow file. The process is pretty simple and straightforward yet if you find yourself stuck somewhere please feel free to reach out to me.
“John the Ripper” – is a fast password cracker. Its primary purpose is to detect weak Unix passwords.
Most likely you do not need to install “John the Ripper” system-wide.
Instead, after you extract the distribution archive and possibly compile the source code (see below), you may simply enter the “run” directory and invoke John from there.
Compiling “John the Ripper”
Step 1: Download the latest version of ““John the Ripper”” and its signature
Step 2: Confirm the signature
This is a safety measure as we are dealing with dangerous thing.
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Install the public key:
![The The](/uploads/1/3/4/7/134733897/113649845.jpg)
Crack Htpasswd John The Ripper Linux Server
Check the signature:
You will see the message similar to the above. Ignore the warning as long as it says Good signature from “Openwall Project … “.
The warning is normal, see http://www.kernel.org/signature.html for more details.
Step 3: Uncompress and compile the sources
Note the make target for your system and type:
Where <system> is the appropriate make target. Alternatively, if your system is not listed, use:
If everything goes well, this will create the executables for John and its related utilities under “./run/”.
Alternatively, you may copy the entire “run” directory to anywhere you like and use John from there.
Now you can change directory to there and test John, like this:
Installing “John the Ripper” on Ubuntu
Execute the next command to install “John the Ripper” on Ubuntu:
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Installing “John the Ripper” on CentOS/RHEL
Crack Htpasswd John The Ripper Linux Download
Execute the next command to install “John the Ripper” on CentOS/RHEL: