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Modifying jtr-1.6.37-mpi2 to perform Wordlist Attacks

After the successful modification of jtr-1.6.37 to jtr-1.6.37-mpicmf2, the next step was to repeat what was performed earlier on jtr-1.6.36 (see: Making JTR-MPI perform a wordlist attack 2) to make it perform wordlist attacks.

These modifications where made to the wordlist.c file, including adding the following header information

    #include "mpi.h"
    #include "ryan.h"

Then the addition of the additional if around the computational work, similar to before

      if ( ((line_number - 1) %mpi_p) == (mpi_id) ) {
      ..
      }

Voila

Six Secrets of Highly Secure Organizations - Security - CIO Magazine Sep 15,2004

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The Parallel Virtual File System Project

Modifying and Testing jtr-1.6.37 for MPI 2

After my initial test failed i had to re-try to get Lim's MPI mod of john-1.6.36 to work for john-1.6.37.

Instead of trying to apply the changes made by Lim to john-1.6.37 - i tried to apply the changes between john-1.6.36 and john-1.6.37 to john-1.6.36-mpi to give me john-1.6.37-mpi (it will be from here on called john-1.6.37-mpicmf2 as it's the 2nd trial and the mod is done by me)

This was performed as follows:

1) Set up the main working directory "john-1.6.37-mpicmf2/"
2) Copy the folder "john-1.6.36/" into "john-1.6.37-mpicmf2/" to give "john-1.6.37-mpicmf2/john-1.6.36/"
3) Copy the folder "john-1.6.37/" into "john-1.6.37-mpicmf2/" to give "john-1.6.37-mpicmf2/john-1.6.37/"
4) Copy the folder "john-1.6.36-mpi" as a new folder into "john-1.6.37-mpicmf2" to give "john-1.6.37-mpicmf2/john-1.6.37-mpicmf2/"

5) Run a comparison between:
"john-1.6.37-mpicmf2/john-1.6.36/src/"
and
"john-1.6.37-mpicmf2/john-1.6.37/src/"

6) Apply the differences between these two directories to the files in:
"john-1.6.37-mpicmf2/john-1.6.37-mpicmf2/src/"

The list of files that needed modifying is as follows:

To test this implementation worked correctly this new folder "john-1.6.37-mpicm2" was copied to the head node of the Obsidian cluster, compiled, then ran.

Due to only 3 of the nodes being available, the test was only able to run on 6 (3x2) processors, to ensure the correct nodes/processors were used the machinefile was modified to look like:

comp-pvfs-0-0:2   
comp-pvfs-0-1:2   
etc

The command to start the test was:

mpirun -np 6 -nolocal -machinefile ~/machines ./john --incremental passwordfile

To test that the processors had started up a brief examination of the john_log.* files revealed that the 6 individual running processes had started - and were cracking away.

Testing jtr-1.6.37 mpi mod

After finishing the work as detailed here - i ran some brief tests.

Unfortunately, even after compiling without errors, the program would suffer segfaults - Which lead me to my second attempt.

See here for the second trial.