root privileges Post: 90131

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Top Forums Programming root privileges Post 90131 by Perderabo on Friday 18th of November 2005 01:51:35 PM

11-18-2005

Administrator Emeritus

Quote:

Originally Posted by sumsin

thanks Perderabo

but I want to run it in GUI mode, so how I use it?

I guess you have me there. Ok, on HP-UX, I changed a old user's password to the terrible password of "password". This changed his encrypted password to "O26nQUAUM2vLA". I copied that string into a program to sidestep the problem of obtaining it. This varies from system to system. Most systems have an /etc/shadow file, but HP-UX does not. And anyway, your question centered around testing a supplied password against the encrypted string. This program works on HP-UX and Solaris...

Code:

#ifdef __STDC__
#define PROTOTYPICAL
#endif
#ifdef __cplusplus
#define PROTOTYPICAL
#endif

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <crypt.h>

#define ENCRYPT "O26nQUAUM2vLA"

#ifdef PROTOTYPICAL
int main(int argc, char *argv[], char *envp[])
#else
main(argc,argv,envp)
int argc;
char *argv[];
char *envp[];
#endif

{
        static char e[] = ENCRYPT;
        static char pass[9];
        strcpy(pass, getpass("Enter password - "));
        printf(" You entered %s which is %d chars in length \n", pass, strlen(pass));
        if (!strcmp(crypt(pass, e), e)) {
                printf("That is the correct password\n");
        } else {
                printf("That is the wrong password\n");
        }
         exit(0);
}

Perderabo

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LEARN ABOUT DEBIAN

pivot_root

PIVOT_ROOT(8)						       System Administration						     PIVOT_ROOT(8)

NAME

       pivot_root - change the root filesystem

SYNOPSIS

       pivot_root new_root put_old

DESCRIPTION

       pivot_root  moves  the root file system of the current process to the directory put_old and makes new_root the new root file system.  Since
       pivot_root(8) simply calls pivot_root(2), we refer to the man page of the latter for further details.

       Note that, depending on the implementation of pivot_root, root and cwd of the caller may or may not change. The following is a sequence for
       invoking pivot_root that works in either case, assuming that pivot_root and chroot are in the current PATH:

       cd new_root
       pivot_root . put_old
       exec chroot . command

       Note that chroot must be available under the old root and under the new root, because pivot_root may or may not have implicitly changed the
       root directory of the shell.

       Note that exec chroot changes the running executable, which is necessary if the old root directory should be  unmounted	afterwards.   Also
       note  that  standard  input, output, and error may still point to a device on the old root file system, keeping it busy. They can easily be
       changed when invoking chroot (see below; note the absence of leading slashes to make it work whether pivot_root	has  changed  the  shell's
       root or not).

EXAMPLES

       Change the root file system to /dev/hda1 from an interactive shell:

       mount /dev/hda1 /new-root
       cd /new-root
       pivot_root . old-root
       exec chroot . sh <dev/console >dev/console 2>&1
       umount /old-root

       Mount the new root file system over NFS from 10.0.0.1:/my_root and run init:

       ifconfig lo 127.0.0.1 up   # for portmap
       # configure Ethernet or such
       portmap	 # for lockd (implicitly started by mount)
       mount -o ro 10.0.0.1:/my_root /mnt
       killall portmap	 # portmap keeps old root busy
       cd /mnt
       pivot_root . old_root
       exec chroot . sh -c 'umount /old_root; exec /sbin/init' 
	 <dev/console >dev/console 2>&1

SEE ALSO

       chroot(1), mount(8), pivot_root(2), umount(8)

AVAILABILITY

       The pivot_root command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   February 2000						     PIVOT_ROOT(8)

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