[sudo-users] Fc9 sudo 1.6.9p13 - env_reset and PATH env var
Steve T
stevetucknott at yahoo.co.uk
Thu Nov 20 07:30:23 EST 2008
I have been using sudo on FC from fc4 onwards.
In FC9 the behaviour seems slightly different in as much that it now
appears that env_reset is the default. That is fine in itself (it took a
while to realise that you had to use !env_reset to turn this flag off) -
but even with !env_reset in the sudoers file, the PATH is still being
reset to ''presumably' a secure path. I've tried adding PATH to env_keep
as well, but that had no effect, and trying to unset !secure_path causes
an error in visudo. How can I keep the users PATH intact?
I searched for env_reset in the archives and couldn't see anything
relevant, but looking through the November threads I did see:
sudo can't find an executable in my $PATH!
That entry seemed to be caused by a compile time setting of secure_path
- but I looked at the sudo -V output for me and cant see that that is
the case here.
The sudo -V output is:
Sudo version 1.6.9p13
Sudoers path: /etc/sudoers
Authentication methods: 'pam'
Syslog facility if syslog is being used for logging: authpriv
Syslog priority to use when user authenticates successfully: notice
Syslog priority to use when user authenticates unsuccessfully: alert
Ignore '.' in $PATH
Send mail if the user is not in sudoers
Use a separate timestamp for each user/tty combo
Lecture user the first time they run sudo
Require users to authenticate by default
Root may run sudo
Allow some information gathering to give useful error messages
Visudo will honor the EDITOR environment variable
Set the LOGNAME and USER environment variables
Length at which to wrap log file lines (0 for no wrap): 80
Authentication timestamp timeout: 5 minutes
Password prompt timeout: 5 minutes
Number of tries to enter a password: 3
Umask to use or 0777 to use user's: 022
Address to send mail to: root
Subject line for mail messages: *** SECURITY information for %h ***
Incorrect password message: Sorry, try again.
Path to authentication timestamp dir: /var/run/sudo
Default password prompt: [sudo] password for %p:
Default user to run commands as: root
Path to the editor for use by visudo: /bin/vi
When to require a password for 'list' pseudocommand: any
When to require a password for 'verify' pseudocommand: all
File containing dummy exec functions: /usr/libexec/sudo_noexec.so
Reset the environment to a default set of variables
Environment variables to check for sanity:
TERM
LINGUAS
LC_*
LANGUAGE
LANG
COLORTERM
Environment variables to remove:
RUBYOPT
RUBYLIB
PYTHONINSPECT
PYTHONPATH
PYTHONHOME
TMPPREFIX
ZDOTDIR
READNULLCMD
NULLCMD
FPATH
PERL5DB
PERL5OPT
PERL5LIB
PERLLIB
PERLIO_DEBUG
JAVA_TOOL_OPTIONS
SHELLOPTS
GLOBIGNORE
PS4
BASH_ENV
ENV
TERMCAP
TERMPATH
TERMINFO_DIRS
TERMINFO
_RLD*
LD_*
PATH_LOCALE
NLSPATH
HOSTALIASES
RES_OPTIONS
LOCALDOMAIN
CDPATH
IFS
Environment variables to preserve:
XAUTHORIZATION
XAUTHORITY
TZ
PS2
PS1
PATH
MAIL
LS_COLORS
KRB5CCNAME
HOSTNAME
DISPLAY
COLORS
....so PATH appears to be in the list to be preserved, but gets reset.
The sudoers file is:
## Sudoers allows particular users to run various commands as
## the root user, without needing the root password.
##
## Examples are provided at the bottom of the file for collections
## of related commands, which can then be delegated out to particular
## users or groups.
##
## This file must be edited with the 'visudo' command.
## Host Aliases
## Groups of machines. You may prefer to use hostnames (perhaps using
## wildcards for entire domains) or IP addresses instead.
# Host_Alias FILESERVERS = fs1, fs2
# Host_Alias MAILSERVERS = smtp, smtp2
## User Aliases
## These aren't often necessary, as you can use regular groups
## (ie, from files, LDAP, NIS, etc) in this file - just use %groupname
## rather than USERALIAS
# User_Alias ADMINS = jsmith, mikem
## Command Aliases
## These are groups of related commands...
## Networking
Cmnd_Alias
NETWORKING= /sbin/route, /sbin/ifconfig, /bin/ping, /sbin/dhclient, /usr/bin/net, /sbin/iptables, /usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool
## Installation and management of software
Cmnd_Alias SOFTWARE = /bin/rpm, /usr/bin/up2date, /usr/bin/yum
## Services
Cmnd_Alias SERVICES = /sbin/service, /sbin/chkconfig
## Updating the locate database
Cmnd_Alias LOCATE = /usr/sbin/updatedb
## Storage
Cmnd_Alias STORAGE
= /sbin/fdisk, /sbin/sfdisk, /sbin/parted, /sbin/partprobe, /bin/mount, /bin/umount
## Delegating permissions
Cmnd_Alias DELEGATING
= /usr/sbin/visudo, /bin/chown, /bin/chmod, /bin/chgrp
## Processes
Cmnd_Alias PROCESSES
= /bin/nice, /bin/kill, /usr/bin/kill, /usr/bin/killall
## Drivers
Cmnd_Alias DRIVERS = /sbin/modprobe
# Defaults specification
#
# Disable "ssh hostname sudo <cmd>", because it will show the password
in clear.
# You have to run "ssh -t hostname sudo <cmd>".
#
Defaults requiretty
#Defaults env_reset
Defaults !env_reset
#Defaults env_keep = "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC
KDEDIR LS_COLORS"
#Defaults env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS
LC_CTYPE"
#Defaults env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT
LC_MESSAGES"
#Defaults env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
LC_TELEPHONE"
#Defaults env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET
XAUTHORITY"
Defaults env_keep += "PATH"
## Next comes the main part: which users can run what software on
## which machines (the sudoers file can be shared between multiple
## systems).
## Syntax:
##
## user MACHINE=COMMANDS
##
## The COMMANDS section may have other options added to it.
##
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
## Allows members of the 'sys' group to run networking, software,
## service management apps and more.
# %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING,
PROCESSES, LOCATE, DRIVERS
## Allows people in group wheel to run all commands
# %wheel ALL=(ALL) ALL
## Same thing without a password
# %wheel ALL=(ALL) NOPASSWD: ALL
## Allows members of the users group to mount and unmount the
## cdrom as root
# %users ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom
## Allows members of the users group to shutdown this system
# %users localhost=/sbin/shutdown -h now
stevet ALL=(ALL) ALL
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