This is the PATH variable without sudo:
$ echo 'echo $PATH' | sh
/opt/local/ruby/bin:/usr/bin:/bin
This is the PATH variable with sudo:
$echo 'echo $PATH' | sudo sh
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
As far as I can tell, sudo is supposed to leave PATH untouched. What's going on? How do I change this? (This is on Ubuntu 8.04).
UPDATE: as far as I can see, none of the scripts started as root change PATH in any way.
From man sudo:
To prevent command spoofing, sudo checks ``.'' and ``'' (both denoting current directory) last when searching for a command in the user's PATH (if one or both are in the PATH). Note, however, that the actual PATH environment variable is not modified and is passed unchanged to the program that sudo executes.
Source: Tips4all
This is an annoying function of sudo on ubuntu.
ReplyDeleteNote this doesn't happen on fedora for example
as sudo is not built with the --with-secure-path option there.
To work around this "problem" on ubuntu I do
the following in my ~/.bashrc
alias sudo='sudo env PATH=$PATH'
Note the above will work for commands that don't reset the $PATH themselves.
However `su' resets it's $PATH so you must use -p to tell it not to. I.E.:
sudo su -p
In case someone else runs accross this and wants to just disable all path variable changing for all users.
ReplyDeleteAccess your sudoers file by using the command:visudo. You should see the following line somewhere:
Defaults env_reset
which you should add the following on the next line
Defaults !secure_path
secure_path is enabled by default. This option specifies what to make $PATH when sudoing. The exclamation mark disables the feature.
'PATH' is an environment variable, and as such is by default reset by sudo.
ReplyDeleteYou need special permissions to be permitted to do this.
From Man Sudo
-E The -E (preserve environment) option will override the env_reset
option in sudoers(5)). It is only available when either the match-
ing command has the SETENV tag or the setenv option is set in sudo-
ers(5).
Environment variables to be set for the command may also be passed on
the command line in the form of VAR=value, e.g.
LD_LIBRARY_PATH=/usr/local/pkg/lib. Variables passed on the command
line are subject to the same restrictions as normal environment vari-
ables with one important exception. If the setenv option is set in
sudoers, the command to be run has the SETENV tag set or the command
matched is ALL, the user may set variables that would overwise be for-
bidden. See sudoers(5) for more information.
An Example of usage:
cat >> test.sh
env | grep "MYEXAMPLE" ;
^D
# sh test.sh
#
# MYEXAMPLE=1 sh test.sh
MYEXAMPLE=1
#
# MYEXAMPLE=1 sudo sh test.sh
#
# MYEXAMPLE=1 sudo MYEXAMPLE=2 sh test.sh
MYEXAMPLE=2
#
update
man 5 sudoers :
env_reset If set, sudo will reset the environment to only contain
the LOGNAME, SHELL, USER, USERNAME and the SUDO_* vari-
ables. Any variables in the caller's environment that
match the env_keep and env_check lists are then added.
The default contents of the env_keep and env_check
lists are displayed when sudo is run by root with the
-V option. If sudo was compiled with the SECURE_PATH
option, its value will be used for the PATH environment
variable. This flag is on by default.
So may need to check that this is/is not compiled in.
It is by default in Gentoo
( From the build Script )
....
ROOTPATH=$(cleanpath /bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin${ROOTPATH:+:${ROOTPATH}})
....
econf --with-secure-path="${ROOTPATH}"
Looks like this bug has been around for quite a while! Here are some bug references you may find helpful (and may want to subscribe to / vote up, hint, hint...):
ReplyDeleteDebian bug #85123 ("sudo: SECURE_PATH still can't be overridden") (from 2001!)
It seems that Bug#20996 is still present in this version of sudo. The
changelog says that it can be overridden at runtime but I haven't yet
discovered how.
They mention putting something like this in your sudoers file:
Defaults secure_path="/bin:/usr/bin:/usr/local/bin"
but when I do that in Ubuntu 8.10 at least, it gives me this error:
visudo: unknown defaults entry `secure_path' referenced near line 10
Ubuntu bug #50797 ("sudo built with --with-secure-path is problematic")
Worse still, as far as I can tell, it
is impossible to respecify secure_path
in the sudoers file. So if, for
example, you want to offer your users
easy access to something under /opt,
you must recompile sudo.
Yes. There needs to be a way to
override this "feature" without having
to recompile. Nothing worse then
security bigots telling you what's
best for your environment and then not
giving you a way to turn it off.
This is really annoying. It might be
wise to keep current behavior by
default for security reasons, but
there should be a way of overriding it
other than recompiling from source
code! Many people ARE in need of PATH
inheritance. I wonder why no
maintainers look into it, which seems
easy to come up with an acceptable
solution.
I worked around it like this:
mv /usr/bin/sudo /usr/bin/sudo.orig
then create a file /usr/bin/sudo containing the following:
#!/bin/bash
/usr/bin/sudo.orig env PATH=$PATH "$@"
then your regular sudo works just like the non secure-path sudo
Ubuntu bug #192651 ("sudo path is always reset")
Given that a duplicate of this bug was
originally filed in July 2006, I'm not
clear how long an ineffectual env_keep
has been in operation. Whatever the
merits of forcing users to employ
tricks such as that listed above,
surely the man pages for sudo and
sudoers should reflect the fact that
options to modify the PATH are
effectively redundant.
Modifying documentation to reflect
actual execution is non destabilising
and very helpful.
Ubuntu bug #226595 ("impossible to retain/specify PATH")
I need to be able to run sudo with
additional non-std binary folders in
the PATH. Having already added my
requirements to /etc/environment I was
surprised when I got errors about
missing commands when running them
under sudo.....
I tried the following to fix this
without sucess:
Using the "sudo -E" option - did not work. My existing PATH was still reset by sudo
Changing "Defaults env_reset" to "Defaults !env_reset" in /etc/sudoers -- also did not work (even when combined with sudo -E)
Uncommenting env_reset (e.g. "#Defaults env_reset") in /etc/sudoers -- also did not work.
Adding 'Defaults env_keep += "PATH"' to /etc/sudoers -- also did not work.
Clearly - despite the man
documentation - sudo is completely
hardcoded regarding PATH and does not
allow any flexibility regarding
retaining the users PATH. Very
annoying as I can't run non-default
software under root permissions using
sudo.
Works now using sudo from the karmic repositories. Details from my configuration:
ReplyDeleteroot@sphinx:~# cat /etc/sudoers | grep -v -e '^$' -e '^#'
Defaults env_reset
Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/grub-1.96/sbin:/opt/grub-1.96/bin"
root ALL=(ALL) ALL
%admin ALL=(ALL) ALL
root@sphinx:~# cat /etc/apt/sources.list
deb http://au.archive.ubuntu.com/ubuntu/ jaunty main restricted universe
deb-src http://au.archive.ubuntu.com/ubuntu/ jaunty main restricted universe
deb http://au.archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe
deb-src http://au.archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe
deb http://security.ubuntu.com/ubuntu jaunty-security main restricted universe
deb-src http://security.ubuntu.com/ubuntu jaunty-security main restricted universe
deb http://au.archive.ubuntu.com/ubuntu/ karmic main restricted universe
deb-src http://au.archive.ubuntu.com/ubuntu/ karmic main restricted universe
deb http://au.archive.ubuntu.com/ubuntu/ karmic-updates main restricted universe
deb-src http://au.archive.ubuntu.com/ubuntu/ karmic-updates main restricted universe
deb http://security.ubuntu.com/ubuntu karmic-security main restricted universe
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted universe
root@sphinx:~#
root@sphinx:~# cat /etc/apt/preferences
Package: sudo
Pin: release a=karmic-security
Pin-Priority: 990
Package: sudo
Pin: release a=karmic-updates
Pin-Priority: 960
Package: sudo
Pin: release a=karmic
Pin-Priority: 930
Package: *
Pin: release a=jaunty-security
Pin-Priority: 900
Package: *
Pin: release a=jaunty-updates
Pin-Priority: 700
Package: *
Pin: release a=jaunty
Pin-Priority: 500
Package: *
Pin: release a=karmic-security
Pin-Priority: 450
Package: *
Pin: release a=karmic-updates
Pin-Priority: 250
Package: *
Pin: release a=karmic
Pin-Priority: 50
root@sphinx:~# apt-cache policy sudo
sudo:
Installed: 1.7.0-1ubuntu2
Candidate: 1.7.0-1ubuntu2
Package pin: 1.7.0-1ubuntu2
Version table:
*** 1.7.0-1ubuntu2 930
50 http://au.archive.ubuntu.com karmic/main Packages
100 /var/lib/dpkg/status
1.6.9p17-1ubuntu3 930
500 http://au.archive.ubuntu.com jaunty/main Packages
root@sphinx:~# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/grub-1.96/sbin:/opt/grub-1.96/bin
root@sphinx:~# exit
exit
abolte@sphinx:~$ echo $PATH
/home/abolte/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/grub-1.96/sbin:/opt/grub-1.96/bin:/opt/chromium-17593:/opt/grub-1.96/sbin:/opt/grub-1.96/bin:/opt/xpra-0.0.6/bin
abolte@sphinx:~$
It's wonderful to finally have this solved without using a hack.
# cat .bash_profile | grep PATH
ReplyDeletePATH=$HOME/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin
export PATH
# cat /etc/sudoers | grep Defaults
Defaults requiretty
Defaults env_reset
Defaults env_keep = "SOME_PARAM1 SOME_PARAM2 ... PATH"
Just comment out "Defaults env_reset" in /etc/sudoers
ReplyDeleteSecure_path is your friend, but if you want to exempt yourself from secure_path just do
ReplyDeletesudo visudo
And append
Defaults exempt_group=your_goup
If you want to exempt a bunch of users create a group, add all the users to it, and use that as your exempt_group. man 5 sudoers for more.
I think it is in fact desirable to have sudo reset the PATH: otherwise an attacker having compromised your user account could put backdoored versions of all kinds of tools on your users' PATH, and they would be executed when using sudo.
ReplyDelete(of course having sudo reset the PATH is not a complete solution to these kinds of problems, but it helps)
This is indeed what happens when you use
Defaults env_reset
in /etc/sudoers without using exempt_group or env_keep.
This is also convenient because you can add directories that are only useful for root (such as /sbin and /usr/sbin) to the sudo path without adding them to your users' paths. To specify the path to be used by sudo:
Defaults secure_path="/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin"
the recommended solution in the comments on the OpenSUSE distro suggests to change:
ReplyDeleteDefaults env_reset
to:
Defaults !env_reset
and then presumably to comment out the following line which isn't needed:
Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASURE MENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL L ANGUAGE LINGUAS XDG_SESSION_COOKIE"
Just edit env_keep in /etc/sudoers
ReplyDeleteit looks something like this:
Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASURE MENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL L ANGUAGE LINGUAS XDG_SESSION_COOKIE"
just append PATH at the end, so after the change it would look like this:
Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASURE MENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL L ANGUAGE LINGUAS XDG_SESSION_COOKIE **PATH**"
close all ur terminal and then open again.
This seemed to work for me
ReplyDeletesudo -i
which takes on the non-sudo PATH
Does root have anything that sets PATH in .bashrc? This is assuming that since you're on Linux, sh is really bash.
ReplyDeleteEr, it's not really a test if you don't add something to your path:
ReplyDeletebill@bill-desktop:~$ ls -l /opt/pkg/bin
total 12
-rwxr-xr-x 1 root root 28 2009-01-22 18:58 foo
bill@bill-desktop:~$ which foo
/opt/pkg/bin/foo
bill@bill-desktop:~$ sudo su
root@bill-desktop:/home/bill# which foo
root@bill-desktop:/home/bill#