[TOOL] SSH Private Keys Cracker
From: SecuriTeam (support_at_securiteam.com)
Date: 04/25/04
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To: list@securiteam.com Date: 25 Apr 2004 19:33:03 +0200
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SSH Private Keys Cracker
------------------------------------------------------------------------
SUMMARY
DETAILS
The following tool written by THC is a SSH Cracker, which is a simple
utility that attempts to crack SSH private keys via brute force.
Tool:
/*
* THC/2003
*
* Simple ssh-private key cracker. Tries to brute force (dictionary
* attack) almost any ssh private key file format.
*
* This is just a quick tool from THC. Using OpenSSL is not really
* fast...
*
* COMPILE:
* gcc -Wall -O2 -o thc-ssh-crack thc-ssh-crack.c -lssl
*
* RUN:
* John is a good password generator. We use it for thc-ssh-crack:
*
* $ john -stdout -incremental | nice -19 thc-ssh-crack id_dsa
*
* Normal dictionary (without john's permutation engine):
*
* $ nice -19 thc-ssh-crack id_dsa <dictionary.txt
*
* Enjoy,
*
* http://www.thc.org
*/
#include <stdio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <string.h>
int
main(int argc, char *argv[])
{
FILE *fp = fopen(argv[1], "r");
EVP_PKEY *pk;
char *ptr;
char pwd[1024];
SSL_library_init();
pwd[0] = '\0';
while (1)
{
if (!fgets(pwd, sizeof pwd, stdin))
{
printf("Password not found.\n");
exit(0);
}
ptr = strchr(pwd, '\n');
if (ptr)
*ptr = '\0';
pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)pwd);
if (pk)
{
printf("THC THC THC THC THC THC THC THC THC\n");
printf("----> pwd is '%s' <-----\n", pwd);
printf("THC THC THC THC THC THC THC THC THC\n");
exit(0);
}
}
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by THC.
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