/*
source: http://www.securityfocus.com/bid/1909/info
ManTrap is a "honeypot" intrusion detection system designed to lure attackers into it for analysis. The honeypot is implemented as a chroot'ed Solaris environment, designed to look and feel real to an attacker who gains access to it.
Chroot (change root) is a unix mechanism that allows an administrator to force a process/process group to run under a subset of the file system, denying access to any other parts of the file system. It is possible for an attacker to guess that they are on a chrooted() ManTrap system by looking at the inode of the root directory (ls -id /). If it is high (usually within the 100000-200000 range), then the root directory is a chrooted() subset of a larger filesystem.
This vulnerability, combined with hidden process disclosure (bugtraq ID 1908) should fairly accurately verify to an attaacker (without root privs) that the host is a ManTrap honeypot, defeating its purpose.
*/
/*
* ManTrap detection/testing program by wilson / f8labs - www.f8labs.org
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
void check_proc_vs_kill(int listpids)
{
struct stat st;
int i, counter;
char buf[520];
printf("proc-vs-kill() test: n");
fflush(0);
if (geteuid() == 0)
{
printf(" Error: Running as root. NOT performing /proc-vs-kill() test.n");
return;
}
if (listpids == 1)
{
printf("Listing mismatching PIDs:n");
}
counter = 0;
for (i = 1; i < 65535; i ++)
{
if ((kill(i, SIGCONT) != 0) && (errno == EPERM)) /* send SIGCONT (which hopefully won't matter) to the process */
{
snprintf(buf, 511, "/proc/%d", i);
if (stat(buf, &st) != 0)
{
counter ++;
if (listpids == 1)
{
printf("%.5d ", i);
if (counter%8 == 0)
{
printf("n");
}
}
}
}
}
if (listpids == 1)
{
printf("n");
}
if (counter == 0)
{
printf(" Normal: No mismatches found.n");
} else
{
printf(" ManTrap? %d mismatching PIDs found.n", counter);
}
}
void check_proc_dotdot()
{
DIR *procDIR;
struct dirent *procdirent;
int found;
printf("dotdot test:n");
procDIR = opendir("/proc");
if (procDIR == NULL)
{
printf(" Error: Couldn't open /proc while performing dotdot test.n");
return;
}
found = 0;
procdirent = readdir(procDIR);
while (procdirent != NULL)
{
if (strcmp(procdirent->d_name, "..") == 0)
{
found = 1;
break;
}
procdirent = readdir(procDIR);
}
closedir(procDIR);
if (found == 0)
{
printf(" ManTrap? /proc/.. not found in directory listing!n");
} else {
printf(" Normal: /proc/.. found in directory listing.n");
}
}
void check_proc_cwdwalk()
{
char savedpwd[2048], newpwd[2048];
printf("cwdwalk test:n");
if (getwd(savedpwd) == NULL)
{
printf(" Error: Couldn't get working directory while performing cwdwalk test.n");
return;
}
if (chdir("/proc/self") != 0)
{
printf(" Error: Couldn't chdir to /proc/self while performing cwdwalk test.n");
return;
}
if (chdir("cwd") != 0)
{
printf(" Error: Couldn't chdir to /proc/self/cwd while performing cwdwalk test.n");
return;
}
if (getwd(newpwd) == NULL)
{
printf(" ManTrap? getwd() failed after chdir to /proc/self/cwd.n");
} else {
printf(" Normal: getwd() succeeded after chdir to /proc/self/cwd.n");
}
chdir(savedpwd);
return;
}
void usage(char *myname)
{
printf("Usage: %s <-a|-p|-l|-d|-c|-h>n", myname);
printf(" -a performs ALL testsn");
printf(" -p performs /proc-vs-kill() testn");
printf(" -l performs /proc-vs-kill() test and lists mismatching PIDsn");
printf(" -d performs /proc/.. testn");
printf(" -c performs /proc/self/cwd testn");
printf(" -h shows this helpn");
}
int main(int argc, char *argv[])
{
printf("ManTrap detection/testing program by [email protected] - www.f8labs.orgn");
if (argc != 2)
{
usage(argv[0]);
exit(1);
}
if (strlen(argv[1]) != 2)
{
usage(argv[0]);
exit(1);
}
switch(argv[1][1])
{
case 'a':
check_proc_vs_kill(0);
check_proc_dotdot();
check_proc_cwdwalk();
break;
case 'p':
check_proc_vs_kill(0);
break;
case 'l':
check_proc_vs_kill(1);
break;
case 'd':
check_proc_dotdot();
break;
case 'c':
check_proc_cwdwalk();
break;
case 'h':
default:
usage(argv[0]);
exit(1);
break;
}
printf("Finished.n");
}
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