1PAM_LISTFILE(8)                Linux-PAM Manual                PAM_LISTFILE(8)
2
3
4

NAME

6       pam_listfile - deny or allow services based on an arbitrary file
7

SYNOPSIS

9       pam_listfile.so item=[tty|user|rhost|ruser|group|shell]
10                       sense=[allow|deny] file=/path/filename
11                       onerr=[succeed|fail] [apply=[user|@group]] [quiet]
12

DESCRIPTION

14       pam_listfile is a PAM module which provides a way to deny or allow
15       services based on an arbitrary file.
16
17       The module gets the item of the type specified -- user specifies the
18       username, PAM_USER; tty specifies the name of the terminal over which
19       the request has been made, PAM_TTY; rhost specifies the name of the
20       remote host (if any) from which the request was made, PAM_RHOST; and
21       ruser specifies the name of the remote user (if available) who made the
22       request, PAM_RUSER -- and looks for an instance of that item in the
23       file=filename.  filename contains one line per item listed. If the item
24       is found, then if sense=allow, PAM_SUCCESS is returned, causing the
25       authorization request to succeed; else if sense=deny, PAM_AUTH_ERR is
26       returned, causing the authorization request to fail.
27
28       If an error is encountered (for instance, if filename does not exist,
29       or a poorly-constructed argument is encountered), then if
30       onerr=succeed, PAM_SUCCESS is returned, otherwise if onerr=fail,
31       PAM_AUTH_ERR or PAM_SERVICE_ERR (as appropriate) will be returned.
32
33       An additional argument, apply=, can be used to restrict the application
34       of the above to a specific user (apply=username) or a given group
35       (apply=@groupname). This added restriction is only meaningful when used
36       with the tty, rhost and shell items.
37
38       Besides this last one, all arguments should be specified; do not count
39       on any default behavior.
40
41       No credentials are awarded by this module.
42

OPTIONS

44       item=[tty|user|rhost|ruser|group|shell]
45           What is listed in the file and should be checked for.
46
47       sense=[allow|deny]
48           Action to take if found in file, if the item is NOT found in the
49           file, then the opposite action is requested.
50
51       file=/path/filename
52           File containing one item per line. The file needs to be a plain
53           file and not world writable.
54
55       onerr=[succeed|fail]
56           What to do if something weird happens like being unable to open the
57           file.
58
59       apply=[user|@group]
60           Restrict the user class for which the restriction apply. Note that
61           with item=[user|ruser|group] this does not make sense, but for
62           item=[tty|rhost|shell] it have a meaning.
63
64       quiet
65           Do not treat service refusals or missing list files as errors that
66           need to be logged.
67

MODULE TYPES PROVIDED

69       All module types (auth, account, password and session) are provided.
70

RETURN VALUES

72       PAM_AUTH_ERR
73           Authentication failure.
74
75       PAM_BUF_ERR
76           Memory buffer error.
77
78       PAM_IGNORE
79           The rule does not apply to the apply option.
80
81       PAM_SERVICE_ERR
82           Error in service module.
83
84       PAM_SUCCESS
85           Success.
86

EXAMPLES

88       Classic 'ftpusers' authentication can be implemented with this entry in
89       /etc/pam.d/ftpd:
90
91           #
92           # deny ftp-access to users listed in the /etc/ftpusers file
93           #
94           auth    required       pam_listfile.so \
95                   onerr=succeed item=user sense=deny file=/etc/ftpusers
96
97
98       Note, users listed in /etc/ftpusers file are (counterintuitively) not
99       allowed access to the ftp service.
100
101       To allow login access only for certain users, you can use a
102       /etc/pam.d/login entry like this:
103
104           #
105           # permit login to users listed in /etc/loginusers
106           #
107           auth    required       pam_listfile.so \
108                   onerr=fail item=user sense=allow file=/etc/loginusers
109
110
111       For this example to work, all users who are allowed to use the login
112       service should be listed in the file /etc/loginusers. Unless you are
113       explicitly trying to lock out root, make sure that when you do this,
114       you leave a way for root to log in, either by listing root in
115       /etc/loginusers, or by listing a user who is able to su to the root
116       account.
117

SEE ALSO

119       pam.conf(5), pam.d(5), pam(8)
120

AUTHOR

122       pam_listfile was written by Michael K. Johnson <johnsonm@redhat.com>
123       and Elliot Lee <sopwith@cuc.edu>.
124
125
126
127Linux-PAM Manual                  09/19/2013                   PAM_LISTFILE(8)
Impressum