Manual: pam_access

PAM_ACCESS(8)					      Linux-PAM Manual					       PAM_ACCESS(8)

NAME
       pam_access - PAM module for logdaemon style login access control

SYNOPSIS

       pam_access.so [debug] [noaudit] [nodefgroup] [nodns] [quiet_log] [accessfile=file] [fieldsep=sep] [listsep=sep]

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.

       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.

MODULE TYPES PROVIDED
       All module types (auth, account, password and session) are provided.

RETURN VALUES
       PAM_SUCCESS
	   Access was granted.

       PAM_PERM_DENIED
	   Access was not granted.

       PAM_IGNORE
	   pam_setcred was called which does nothing.

       PAM_ABORT
	   Not all relevant data or options could be gotten.

       PAM_USER_UNKNOWN
	   The user is not known to the system.

FILES
       /etc/security/access.conf
	   Default configuration file

SEE ALSO
       access.conf(5), pam.d(5), pam(7).

AUTHORS
       The logdaemon style login access control scheme was designed and implemented by Wietse Venema. The pam_access PAM
       module was developed by Alexei Nogin . The IPv6 support and the network(address) / netmask
       feature was developed and provided by Mike Becher .

Linux-PAM						 07/16/2026					       PAM_ACCESS(8)