NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | FILES | BUGS | DIAGNOSTICS | SEE ALSO | COLOPHON

SUAUTH(5)               File Formats and Conversions               SUAUTH(5)

NAME         top

       suauth - detailed su control file

SYNOPSIS         top

       /etc/suauth

DESCRIPTION         top

       The file /etc/suauth is referenced whenever the su command is called.
       It can change the behaviour of the su command, based upon:

                 1) the user su is targeting

       2) the user executing the su command (or any groups he might be a
       member of)

       The file is formatted like this, with lines starting with a # being
       treated as comment lines and ignored;

                 to-id:from-id:ACTION

       Where to-id is either the word ALL, a list of usernames delimited by
       "," or the words ALL EXCEPT followed by a list of usernames delimited
       by ",".

       from-id is formatted the same as to-id except the extra word GROUP is
       recognized.  ALL EXCEPT GROUP is perfectly valid too. Following GROUP
       appears one or more group names, delimited by ",". It is not
       sufficient to have primary group id of the relevant group, an entry
       in /etc/group(5) is necessary.

       Action can be one only of the following currently supported options.

       DENY
           The attempt to su is stopped before a password is even asked for.

       NOPASS
           The attempt to su is automatically successful; no password is
           asked for.

       OWNPASS
           For the su command to be successful, the user must enter his or
           her own password. They are told this.

       Note there are three separate fields delimited by a colon. No
       whitespace must surround this colon. Also note that the file is
       examined sequentially line by line, and the first applicable rule is
       used without examining the file further. This makes it possible for a
       system administrator to exercise as fine control as he or she wishes.

EXAMPLE         top

                 # sample /etc/suauth file
                 #
                 # A couple of privileged usernames may
                 # su to root with their own password.
                 #
                 root:chris,birddog:OWNPASS
                 #
                 # Anyone else may not su to root unless in
                 # group wheel. This is how BSD does things.
                 #
                 root:ALL EXCEPT GROUP wheel:DENY
                 #
                 # Perhaps terry and birddog are accounts
                 # owned by the same person.
                 # Access can be arranged between them
                 # with no password.
                 #
                 terry:birddog:NOPASS
                 birddog:terry:NOPASS
                 #

FILES         top

       /etc/suauth

BUGS         top

       There could be plenty lurking. The file parser is particularly
       unforgiving about syntax errors, expecting no spurious whitespace
       (apart from beginning and end of lines), and a specific token
       delimiting different things.

DIAGNOSTICS         top

       An error parsing the file is reported using syslogd(8) as level ERR
       on facility AUTH.

SEE ALSO         top

       su(1).

COLOPHON         top

       This page is part of the shadow-utils (utilities for managing
       accounts and shadow password files) project.  Information about the
       project can be found at ⟨http://pkg-shadow.alioth.debian.org/⟩.  If
       you have a bug report for this manual page, see 
       ⟨http://pkg-shadow.alioth.debian.org/getinvolved.php⟩.  This page was
       obtained from the project's upstream Git repository 
       ⟨git://anonscm.debian.org/git/pkg-shadow/shadow.git⟩ on 2017-09-15.
       If you discover any rendering problems in this HTML version of the
       page, or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the information
       in this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org

shadow-utils 4.4                 09/15/2017                        SUAUTH(5)