NAME | SYNOPSIS | DESCRIPTION | OPTION | NOTES | SEE ALSO | AUTHOR | AVAILABILITY | COLOPHON

SETPRIV(1)                      User Commands                     SETPRIV(1)

NAME         top

       setpriv - run a program with different Linux privilege settings

SYNOPSIS         top

       setpriv [options] program [arguments]

DESCRIPTION         top

       Sets or queries various Linux privilege settings that are inherited
       across execve(2).

       The difference between the commands setpriv and su (or runuser) is
       that setpriv does not use open PAM session and does not ask for
       password.  It's simple non-set-user-ID wrapper around execve system
       call.

OPTION         top

       --clear-groups
              Clear supplementary groups.

       -d, --dump
              Dump current privilege state.  Can be specified more than once
              to show extra, mostly useless, information.  Incompatible with
              all other options.

       --groups group...
              Set supplementary groups.  The argument is a comma-separated
              list.

       --inh-caps (+|-)cap...  or  --bounding-set (+|-)cap...
              Set the inheritable capabilities or the capability bounding
              set.  See capabilities(7).  The argument is a comma-separated
              list of +cap and -cap entries, which add or remove an entry
              respectively.  +all and -all can be used to add or remove all
              caps.  The set of capabilities starts out as the current
              inheritable set for --inh-caps and the current bounding set
              for --bounding-set.  If you drop something from the bounding
              set without also dropping it from the inheritable set, you are
              likely to become confused.  Do not do that.

       --keep-groups
              Preserve supplementary groups.  Only useful in conjunction
              with --rgid, --egid, or --regid.

       --list-caps
              List all known capabilities.  This option must be specified
              alone.

       --no-new-privs
              Set the no_new_privs bit.  With this bit set, execve(2) will
              not grant new privileges.  For example, the set-user-ID and
              set-group-ID bits as well as file capabilities will be
              disabled.  (Executing binaries with these bits set will still
              work, but they will not gain privileges.  Certain LSMs,
              especially AppArmor, may result in failures to execute certain
              programs.)  This bit is inherited by child processes and
              cannot be unset.  See prctl(2) and Documentation/prctl/no_new_
              privs.txt in the Linux kernel source.

              The no_new_privs bit is supported since Linux 3.5.

       --rgid gid, --egid gid, --regid gid
              Set the real, effective, or both GIDs.  The gid argument can
              be given as textual group name.

              For safety, you must specify one of --clear-groups, --groups,
              or --keep-groups if you set any primary gid.

       --ruid uid, --euid uid, --reuid uid
              Set the real, effective, or both UIDs.  The uid argument can
              be given as textual login name.

              Setting a uid or gid does not change capabilities, although
              the exec call at the end might change capabilities.  This
              means that, if you are root, you probably want to do something
              like:

                      setpriv --reuid=1000 --regid=1000 --caps=-all

       --securebits (+|-)securebit...
              Set or clear securebits.  The argument is a comma-separated
              list.  The valid securebits are noroot, noroot_locked,
              no_setuid_fixup, no_setuid_fixup_locked, and keep_caps_locked.
              keep_caps is cleared by execve(2) and is therefore not
              allowed.

       --selinux-label label
              Request a particular SELinux transition (using a transition on
              exec, not dyntrans).  This will fail and cause setpriv(1) to
              abort if SELinux is not in use, and the transition may be
              ignored or cause execve(2) to fail at SELinux's whim.  (In
              particular, this is unlikely to work in conjunction with
              no_new_privs.)  This is similar to runcon(1).

       --apparmor-profile profile
              Request a particular AppArmor profile (using a transition on
              exec).  This will fail and cause setpriv(1) to abort if
              AppArmor is not in use, and the transition may be ignored or
              cause execve(2) to fail at AppArmor's whim.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

NOTES         top

       If applying any specified option fails, program will not be run and
       setpriv will return with exit code 127.

       Be careful with this tool -- it may have unexpected security
       consequences.  For example, setting no_new_privs and then execing a
       program that is SELinux-confined (as this tool would do) may prevent
       the SELinux restrictions from taking effect.

SEE ALSO         top

       runuser(1), su(1), prctl(2), capabilities(7)

AUTHOR         top

       Andy Lutomirski ⟨luto@amacapital.net⟩

AVAILABILITY         top

       The setpriv command is part of the util-linux package and is
       available from Linux Kernel Archive 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found at 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you have a
       bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository 
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2017-03-13.  If you discover any rendering problems in this HTML ver‐
       sion 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 man‐
       ual page), send a mail to man-pages@man7.org

util-linux                        July 2014                       SETPRIV(1)