10-14-2009
Why cant you use sudo itself ?! Its fairly an easy process.
Else you can try using set-user-id thing, which your passwd command uses.
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LEARN ABOUT REDHAT
setuid
SETUID(2) Linux Programmer's Manual SETUID(2)
NAME
setuid - set user identity
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int setuid(uid_t uid);
DESCRIPTION
setuid sets the effective user ID of the current process. If the effective userid of the caller is root, the real and saved user ID's are
also set.
Under Linux, setuid is implemented like the POSIX version with the _POSIX_SAVED_IDS feature. This allows a setuid (other than root) pro-
gram to drop all of its user privileges, do some un-privileged work, and then re-engage the original effective user ID in a secure manner.
If the user is root or the program is setuid root, special care must be taken. The setuid function checks the effective uid of the caller
and if it is the superuser, all process related user ID's are set to uid. After this has occurred, it is impossible for the program to
regain root privileges.
Thus, a setuid-root program wishing to temporarily drop root privileges, assume the identity of a non-root user, and then regain root priv-
ileges afterwards cannot use setuid. You can accomplish this with the (non-POSIX, BSD) call seteuid.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EPERM The user is not the super-user, and uid does not match the real or saved user ID of the calling process.
CONFORMING TO
SVr4, SVID, POSIX.1. Not quite compatible with the 4.4BSD call, which sets all of the real, saved, and effective user IDs. SVr4 documents
an additional EINVAL error condition.
LINUX-SPECIFIC REMARKS
Linux has the concept of filesystem user ID, normally equal to the effective user ID. The setuid call also sets the filesystem user ID of
the current process. See setfsuid(2).
If uid is different from the old effective uid, the process will be forbidden from leaving core dumps.
SEE ALSO
getuid(2), setreuid(2), seteuid(2), setfsuid(2)
Linux 1.1.36 1994-07-29 SETUID(2)