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I        pam_access — PAM module for logdaemon style login access control

════════════════════════════════════════════════════════════════════════════════

DESCRIPTION

The pam_access PAM module is mainly for access management. It provides logdaemon
style login access control based on login names, host or domain names, internet
addresses or network numbers, or on terminal line names, X $DISPLAY values, or
PAM service names in case of non-networked logins.

By default rules for access management are taken from config file
/etc/security/access.conf if you don't specify another file. Then individual
*.conf files from the /etc/security/access.d/ directory are read. The files are
parsed one after another in the order of the system locale. The effect of the
individual files is the same as if all the files were concatenated together in
the order of parsing. This means that once a pattern is matched in some file no
further files are parsed. If a config file is explicitly specified with the
accessfile option the files in the above directory are not parsed.

By default rules for access management are taken from config file
/etc/security/access.conf or, if that one is not present, the file
%vendordir%/security/access.conf. These settings can be overruled by setting in
a config file explicitly specified with the accessfile option. Then individual
*.conf files from the /etc/security/access.d/ and %vendordir%/security/access.d
directories are read. If /etc/security/access.d/@filename@.conf exists, then
%vendordir%/security/access.d/@filename@.conf will not be used. All
access.d/*.conf files are sorted by their @filename@.conf in lexicographic order
regardless of which of the directories they reside in. The effect of the
individual files is the same as if all the files were concatenated together in
the order of parsing. This means that once a pattern is matched in some file no
further files are parsed. If a config file is explicitly specified with the
accessfile option the files in the above directories are not parsed.

If Linux PAM is compiled with audit support the module will report when it
denies access based on origin (host, tty, etc.).

OPTIONS

accessfile=/path/to/access.conf

        Indicate an alternative access.conf style configuration file to override
        the default. This can be useful when different services need different
        access lists.

debug

        A lot of debug information is printed with syslog(3).

noaudit

        Do not report logins from disallowed hosts and ttys to the audit
        subsystem.

nodefgroup

        User tokens which are not enclosed in parentheses will not be matched
        against the group database. The backwards compatible default is to try
        the group database match even for tokens not enclosed in parentheses.

nodns

        Do not try to resolve tokens as hostnames, only IPv4 and IPv6 addresses
        will be resolved. Which means to allow login from a remote host, the IP
        addresses need to be specified in access.conf.

quiet_log

        Do not log denials with syslog(3).

fieldsep=separators

        This option modifies the field separator character that pam_access will
        recognize when parsing the access configuration file. For example:
        fieldsep=| will cause the default `:' character to be treated as part of
        a field value and `|' becomes the field separator. Doing this may be
        useful in conjunction with a system that wants to use pam_access with X
        based applications, since the PAM_TTY item is likely to be of the form
        "hostname:0" which includes a `:' character in its value. But you should
        not need this.

listsep=separators

        This option modifies the list separator character that pam_access will
        recognize when parsing the access configuration file. For example:
        listsep=, will cause the default ` ' (space) and `\t' (tab) characters
        to be treated as part of a list element value and `,' becomes the only
        list element separator. Doing this may be useful on a system with group
        information obtained from a Windows domain, where the default built-in
        groups "Domain Users", "Domain Admins" contain a space.

EXAMPLES

These are some example lines which might be specified in
/etc/security/access.conf.

User root should be allowed to get access via cron, X11 terminal :0, tty1, ...,
tty5, tty6.

+:root:crond :0 tty1 tty2 tty3 tty4 tty5 tty6

User root should be allowed to get access from hosts which own the IPv4
addresses. This does not mean that the connection have to be a IPv4 one, a IPv6
connection from a host with one of this IPv4 addresses does work, too.

+:root:192.168.200.1 192.168.200.4 192.168.200.9

+:root:127.0.0.1

User root should get access from network 192.168.201. where the term will be
evaluated by string matching. But it might be better to use network/netmask
instead. The same meaning of 192.168.201. is 192.168.201.0/24 or
192.168.201.0/255.255.255.0.

+:root:192.168.201.

User root should be able to have access from hosts foo1.bar.org and foo2.bar.org
(uses string matching also).

+:root:foo1.bar.org foo2.bar.org

User root should be able to have access from domain foo.bar.org (uses string
matching also).

+:root:.foo.bar.org

User root should be denied to get access from all other sources.

-:root:ALL

A user with uid 1003 and a group with gid 1000 should be allowed to get access
from all other sources.

+:(1000) 1003:ALL

User foo and members of netgroup admins should be allowed to get access from all
sources. This will only work if netgroup service is available.

+:@admins foo:ALL

User john and foo should get access from IPv6 host address.

+:john foo:2001:db8:0:101::1

User john and foo should get access from IPv6 link local host address.

+:john foo:fe80::de95:818c:1b55:7e42%eth1

User john should get access from IPv6 net/mask.

+:john:2001:db8:0:101::/64

Members of group wheel should be allowed to get access from all sources.

+:(wheel):ALL

Disallow console logins to all but the shutdown, sync and all other accounts,
which are a member of the wheel group.

-:ALL EXCEPT (wheel) shutdown sync:LOCAL

All other users should be denied to get access from all sources.

-:ALL:ALL
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