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📄 README.pam_access(5.13 KB)
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📄 README.pam_console(1.88 KB)
📄 README.pam_cracklib(9.53 KB)
📄 README.pam_debug(1.95 KB)
📄 README.pam_deny(1.01 KB)
📄 README.pam_echo(1.07 KB)
📄 README.pam_env(3.54 KB)
📄 README.pam_exec(2.18 KB)
📄 README.pam_faildelay(827 B)
📄 README.pam_faillock(5.92 KB)
📄 README.pam_filter(3.03 KB)
📄 README.pam_ftp(1.66 KB)
📄 README.pam_group(2.12 KB)
📄 README.pam_issue(1.32 KB)
📄 README.pam_keyinit(2.19 KB)
📄 README.pam_lastlog(2.54 KB)
📄 README.pam_limits(2.36 KB)
📄 README.pam_listfile(3.54 KB)
📄 README.pam_localuser(1.14 KB)
📄 README.pam_loginuid(1.09 KB)
📄 README.pam_mail(1.96 KB)
📄 README.pam_mkhomedir(1.33 KB)
📄 README.pam_motd(2.53 KB)
📄 README.pam_namespace(11.27 KB)
📄 README.pam_nologin(1.32 KB)
📄 README.pam_permit(907 B)
📄 README.pam_postgresok(346 B)
📄 README.pam_pwhistory(2.19 KB)
📄 README.pam_rhosts(1.84 KB)
📄 README.pam_rootok(1.06 KB)
📄 README.pam_securetty(1.31 KB)
📄 README.pam_selinux(2.84 KB)
📄 README.pam_sepermit(1.61 KB)
📄 README.pam_shells(653 B)
📄 README.pam_stress(2.01 KB)
📄 README.pam_succeed_if(2.8 KB)
📄 README.pam_time(1.27 KB)
📄 README.pam_timestamp(1.58 KB)
📄 README.pam_tty_audit(2.71 KB)
📄 README.pam_umask(1.59 KB)
📄 README.pam_unix(7.09 KB)
📄 README.pam_userdb(2.9 KB)
📄 README.pam_usertype(1.17 KB)
📄 README.pam_warn(1.2 KB)
📄 README.pam_wheel(1.92 KB)
📄 README.pam_xauth(3.61 KB)

Editing: README.pam_listfile

pam_listfile — deny or allow services based on an arbitrary file

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DESCRIPTION

pam_listfile is a PAM module which provides a way to deny or allow services
based on an arbitrary file.

The module gets the item of the type specified -- user specifies the username, 
PAM_USER; tty specifies the name of the terminal over which the request has
been made, PAM_TTY; rhost specifies the name of the remote host (if any) from
which the request was made, PAM_RHOST; and ruser specifies the name of the
remote user (if available) who made the request, PAM_RUSER -- and looks for an
instance of that item in the file=filename. filename contains one line per item
listed. If the item is found, then if sense=allow, PAM_SUCCESS is returned,
causing the authorization request to succeed; else if sense=deny, PAM_AUTH_ERR
is returned, causing the authorization request to fail.

If an error is encountered (for instance, if filename does not exist, or a
poorly-constructed argument is encountered), then if onerr=succeed, PAM_SUCCESS
is returned, otherwise if onerr=fail, PAM_AUTH_ERR or PAM_SERVICE_ERR (as
appropriate) will be returned.

An additional argument, apply=, can be used to restrict the application of the
above to a specific user (apply=username) or a given group (apply=@groupname).
This added restriction is only meaningful when used with the tty, rhost and 
shell items.

Besides this last one, all arguments should be specified; do not count on any
default behavior.

No credentials are awarded by this module.

OPTIONS

What is listed in the file and should be checked for.

sense=[allow|deny]

Action to take if found in file, if the item is NOT found in the file, then
    the opposite action is requested.

file=/path/filename

File containing one item per line. The file needs to be a plain file and
    not world writable.

onerr=[succeed|fail]

What to do if something weird happens like being unable to open the file.

apply=[user|@group]

Restrict the user class for which the restriction apply. Note that with
    item=[user|ruser|group] this does not make sense, but for item=[tty|rhost|
    shell] it have a meaning.

quiet

Do not treat service refusals or missing list files as errors that need to
    be logged.

EXAMPLES

Classic 'ftpusers' authentication can be implemented with this entry in /etc/
pam.d/ftpd:

#
# deny ftp-access to users listed in the /etc/ftpusers file
#
auth    required       pam_listfile.so \
        onerr=succeed item=user sense=deny file=/etc/ftpusers

Note, users listed in /etc/ftpusers file are (counterintuitively) not allowed
access to the ftp service.

To allow login access only for certain users, you can use a /etc/pam.d/login
entry like this:

#
# permit login to users listed in /etc/loginusers
#
auth    required       pam_listfile.so \
        onerr=fail item=user sense=allow file=/etc/loginusers

For this example to work, all users who are allowed to use the login service
should be listed in the file /etc/loginusers. Unless you are explicitly trying
to lock out root, make sure that when you do this, you leave a way for root to
log in, either by listing root in /etc/loginusers, or by listing a user who is
able to su to the root account.

AUTHOR

pam_listfile was written by Michael K. Johnson <johnsonm@redhat.com> and Elliot
Lee <sopwith@cuc.edu>.

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Editing: README.pam_listfile

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