pam_exec is a PAM module that can be used to run an external
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 controll over the environment.
Print debug information.
During authentication 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.
The output of the command is appended to file
Only run the command if the module type matches the given
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.
Per default pam_exec.so will echo the exit status of the
external command if it fails. Specifying this option will
suppress the message.
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.
The external command was run successfully.
No argument or a wrong number of arguments were given.
A system error occurred or the command to execute failed.
pam_setcred was called, which does not execute the command.
Or, the value given for the type= parameter did not match the
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.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the tarball Linux-PAM-1.3.0.tar.bz2 fetched from
⟨http://www.linux-pam.org/library/⟩ on 2021-04-01. 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 firstname.lastname@example.org
Linux-PAM Manual 04/01/2016 PAM_EXEC(8)