             pam_exec — PAM module which calls an external command

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DESCRIPTION

pam_exec is a PAM module that can be used to run an external command.

The child's environment is set to the current PAM environment list, as returned
by pam_getenvlist(3) In addition, the following PAM items are exported as
environment variables: PAM_RHOST, PAM_RUSER, PAM_SERVICE, PAM_TTY, PAM_USER and
PAM_TYPE, which contains one of the module types: account, auth, password,
open_session and close_session.

Commands called by pam_exec need to be aware of that the user can have control
over the environment.

OPTIONS

debug

        Print debug information.

expose_authtok

        During authentication and password change the calling command can read
        the password from stdin(3). Only first PAM_MAX_RESP_SIZE bytes of a
        password are provided to the command.

log=file

        The output of the command is appended to file

type=type

        Only run the command if the module type matches the given type.

stdout

        Per default the output of the executed command is written to /dev/null.
        With this option, the stdout output of the executed command is
        redirected to the calling application. It's in the responsibility of
        this application what happens with the output. The log option is
        ignored.

quiet

        Per default pam_exec.so will echo the exit status of the external
        command if it fails. Specifying this option will suppress the message.

quiet_log

        Per default pam_exec.so will log the exit status of the external command
        if it fails. Specifying this option will suppress the log message.

seteuid

        Per default pam_exec.so will execute the external command with the real
        user ID of the calling process. Specifying this option means the command
        is run with the effective user ID.

EXAMPLES

Add the following line to /etc/pam.d/passwd to rebuild the NIS database after
each local password change:

        password optional pam_exec.so seteuid /usr/bin/make -C /var/yp


This will execute the command

make -C /var/yp

with effective user ID.

AUTHOR

pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de> and Josh Triplett
<josh@joshtriplett.org>.
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