'\" t
.\"     Title: pam_shells
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.2 <http://docbook.sf.net/>
.\"      Date: 08/28/2024
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM
.\"  Language: English
.\"
.TH "PAM_SHELLS" "8" "08/28/2024" "Linux\-PAM" "Linux\-PAM Manual"
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.SH "NAME"
pam_shells \- PAM module to check for valid login shell
.SH "SYNOPSIS"
.HP \w'\fBpam_shells\&.so\fR\ 'u
\fBpam_shells\&.so\fR
.SH "DESCRIPTION"
.PP
pam_shells is a PAM module that only allows access to the system if the user\*(Aqs shell is listed in
/etc/shells\&.
.PP
It also checks if needed files (e\&.g\&.
/etc/shells) are plain files and not world writable\&.
.SH "OPTIONS"
.PP
This module does not recognise any options\&.
.SH "MODULE TYPES PROVIDED"
.PP
The
\fBauth\fR
and
\fBaccount\fR
module types are provided\&.
.SH "RETURN VALUES"
.PP
PAM_AUTH_ERR
.RS 4
Access to the system was denied\&.
.RE
.PP
PAM_SUCCESS
.RS 4
The user\*(Aqs login shell was listed as valid shell in
/etc/shells\&.
.RE
.PP
PAM_USER_UNKNOWN
.RS 4
The user does not exist or the user\*(Aqs login shell could not be determined\&.
.RE
.PP
PAM_SERVICE_ERR
.RS 4
The module was not able to get the name of the user\&.
.RE
.SH "EXAMPLES"
.PP
.if n \{\
.RS 4
.\}
.nf
auth  required  pam_shells\&.so
      
.fi
.if n \{\
.RE
.\}
.sp
.SH "SEE ALSO"
.PP
\fBshells\fR(5),
\fBpam.conf\fR(5),
\fBpam.d\fR(5),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_shells was written by Erik Troan <ewt@redhat\&.com>\&.