This is the command uid_wrapper that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
uid_wrapper - A wrapper to fake privilege separation
SYNOPSIS
LD_PRELOAD=libuid_wrapper.so UID_WRAPPER=1 UID_WRAPPER_ROOT=1 ./myapplication
DESCRIPTION
· Allows uid switching as a normal user.
· Start any application making it believe it is running as root.
· Support for user/group changing in the local thread using the syscalls (like glibc).
· More precisely this library intercepts seteuid and related calls, and simulates them
in a manner similar to the nss_wrapper and socket_wrapper libraries.
Some projects like a file server need privilege separation to be able to switch to the
connection user and do file operations. uid_wrapper convincingly lies to the application
letting it believe it is operating as root and even switching between UIDs and GIDs as
needed.
ENVIRONMENT VARIABLES
UID_WRAPPER
If you load the uid_wrapper and enable it with setting UID_WRAPPER=1 all setuid and
setgid will work, even as a normal user.
UID_WRAPPER_ROOT
It is possible to start your application as fake root with setting UID_WRAPPER_ROOT=1.
UID_WRAPPER_DEBUGLEVEL
If you need to see what is going on in uid_wrapper itself or try to find a bug, you
can enable logging support in uid_wrapper if you built it with debug symbols.
· 0 = ERROR
· 1 = WARNING
· 2 = DEBUG
· 3 = TRACE
EXAMPLE
$ LD_PRELOAD=libuid_wrapper.so UID_WRAPPER=1 UID_WRAPPER_ROOT=1 id
uid=0(root) gid=0(root) groups=100(users),0(root)
2014-07-11 UID_WRAPPER(1)
Use uid_wrapper online using onworks.net services
