[sudo-users] sudo -u & environment help

[Craig R. Skinner]

On 2014-05-26 Mon 09:33 AM |, Shawn McMahon wrote:
> Run sudo -V as root:
> 
> sudo sudo -V
> 
> That'll show you how it was compiled, in addition to how it's
> configured.
> 


$ sudo sudo -V
Sudo version 1.7.2p8

Sudoers path: /etc/sudoers
Authentication methods: 'bsdauth'
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
Send mail if the user is not in sudoers
Lecture user the first time they run sudo
Require users to authenticate by default
Root may run sudo
Insult the user when they enter an incorrect password
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
Path to mail program: /usr/sbin/sendmail
Flags for mail program: -t
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: Password:
Default user to run commands as: root
Path to the editor for use by visudo: /usr/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
File descriptors >= 3 will be closed before executing a command
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
        HOME
        DISPLAY
        COLORS
Locale to use while parsing sudoers: C
Local IP address and netmask pairs:
...
...
..


Despite the above, these envrionment vaiables are correctly altered:
HOME (login(1)??? & /etc/passwd)
PS1 (/etc/profile)

These are not:
PATH
MAIL
umask (/etc/login.conf --> should change to 022)


<craig at teak:bin 2>$ echo $LOGNAME; echo $PATH; echo $MAIL; umask
craig
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin:/usr/site/bin:/usr/site/sbin:/home/craig/bin
/var/mail/craig
027

<craig at teak:bin 2>$ sudo -i -u david
<david at teak:~ 0>$ echo $LOGNAME; echo $PATH; echo $MAIL; umask
david
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin:/usr/site/bin:/usr/site/sbin:/home/craig/bin
                                                                                                ^^^^^
/var/mail/craig
          ^^^^^
027
  ^


<craig at teak:bin 2>$ sudo su -l david
<david at teak:~ 0>$ echo $LOGNAME; echo $PATH; echo $MAIL; umask
david
/usr/bin:/bin:/usr/local/bin:/usr/site/bin:/home/david/bin
                                                 ^^^^^
/var/mail/david
          ^^^^^
022
  ^


I don't understand why "sudo su -l username" cleanly logs into the
user's environment, but "sudo -i -u username" ignores PATH, MAIL & umask


The authentication method is 'bsdauth', yet it seems to ignore some
/etc/login.conf directives and login(1) defaults. While su -l works.

Thoughts?

http://thread.gmane.org/gmane.os.openbsd.misc/211823/