Service manual

189Appendix J Linux-PAM
Cyclades-TS Installation & Service Manual
Currently the Cyclades-TS has the following modules available:
pam_access - Provides logdaemon style login access control.
pam_deny - Deny access to all users.
pam_env - This module allows the (un)setting of environment variables. Supported is the use of previously set
environment variables as well as PAM_ITEMs such as PAM_RHOST.
pam_filter - This module was written to offer a plug-in alternative to programs like ttysnoop (XXX - need a
reference). Since writing a filter that performs this function has not occurred, it is currently only a toy. The single
filter provided with the module simply transposes upper and lower case letters in the input and output streams.
(This can be very annoying and is not kind to termcap based editors).
pam_group - This module provides group-settings based on the user’s name and the terminal they are requesting
a given service from. It takes note of the time of day.
pam_issue - This module presents the issue file (/etc/issue by default) when prompting for a username.
pam_lastlog - This session module maintains the /var/log/lastlog file. Adding an open entry when called via the
pam_open_seesion()function and completing it when pam_close_session() is called. This module can also
display a line of information about the last login of the user. If an application already performs these tasks, it is not
necessary to use this module.
pam_limits - This module, through the Linux-PAM open-session hook, sets limits on the system resources that
can be obtained in a user-session. Its actions are dictated more explicitly through the configuration file discussed
below.
pam_listfile - The list-file module provides a way to deny or allow services based on an arbitrary file.