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+'\" t
+.\"     Title: pam_usertype
+.\"    Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\"      Date: 06/08/2020
+.\"    Manual: Linux-PAM
+.\"    Source: Linux-PAM
+.\"  Language: English
+.\"
+.TH "PAM_USERTYPE" "8" "06/08/2020" "Linux-PAM" "Linux\-PAM"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+pam_usertype \- check if the authenticated user is a system or regular account
+.SH "SYNOPSIS"
+.HP \w'\fBpam_usertype\&.so\fR\ 'u
+\fBpam_usertype\&.so\fR [\fIflag\fR...] {\fIcondition\fR}
+.SH "DESCRIPTION"
+.PP
+pam_usertype\&.so is designed to succeed or fail authentication based on type of the account of the authenticated user\&. The type of the account is decided with help of
+\fISYS_UID_MIN\fR
+and
+\fISYS_UID_MAX\fR
+settings in
+\fI/etc/login\&.defs\fR\&. One use is to select whether to load other modules based on this test\&.
+.PP
+The module should be given only one condition as module argument\&. Authentication will succeed only if the condition is met\&.
+.SH "OPTIONS"
+.PP
+The following
+\fIflag\fRs are supported:
+.PP
+\fBuse_uid\fR
+.RS 4
+Evaluate conditions using the account of the user whose UID the application is running under instead of the user being authenticated\&.
+.RE
+.PP
+\fBaudit\fR
+.RS 4
+Log unknown users to the system log\&.
+.RE
+.PP
+Available
+\fIcondition\fRs are:
+.PP
+\fBissystem\fR
+.RS 4
+Succeed if the user is a system user\&.
+.RE
+.PP
+\fBisregular\fR
+.RS 4
+Succeed if the user is a regular user\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+All module types (\fBaccount\fR,
+\fBauth\fR,
+\fBpassword\fR
+and
+\fBsession\fR) are provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_SUCCESS
+.RS 4
+The condition was true\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_CONV_ERR
+.RS 4
+The conversation method supplied by the application failed to obtain the username\&.
+.RE
+.PP
+PAM_INCOMPLETE
+.RS 4
+The conversation method supplied by the application returned PAM_CONV_AGAIN\&.
+.RE
+.PP
+PAM_AUTH_ERR
+.RS 4
+The condition was false\&.
+.RE
+.PP
+PAM_SERVICE_ERR
+.RS 4
+A service error occurred or the arguments can\*(Aqt be parsed correctly\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User was not found\&.
+.RE
+.SH "EXAMPLES"
+.PP
+Skip remaining modules if the user is a system user:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+account sufficient pam_usertype\&.so issystem
+    
+.fi
+.if n \{\
+.RE
+.\}
+.SH "SEE ALSO"
+.PP
+\fBlogin.defs\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+Pavel Březina <pbrezina@redhat\&.com>