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.\"     Title: pam_setcred
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 09/03/2021
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM Manual
.\"  Language: English
.\"
.TH "PAM_SETCRED" "3" "09/03/2021" "Linux-PAM Manual" "Linux-PAM Manual"
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.SH "NAME"
pam_setcred \- establish / delete user credentials
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <security/pam_appl\&.h>
.fi
.ft
.HP \w'int\ pam_setcred('u
.BI "int pam_setcred(pam_handle_t\ *" "pamh" ", int\ " "flags" ");"
.SH "DESCRIPTION"
.PP
The
\fBpam_setcred\fR
function is used to establish, maintain and delete the credentials of a user\&. It should be called to set the credentials after a user has been authenticated and before a session is opened for the user (with
\fBpam_open_session\fR(3))\&. The credentials should be deleted after the session has been closed (with
\fBpam_close_session\fR(3))\&.
.PP
A credential is something that the user possesses\&. It is some property, such as a
\fIKerberos\fR
ticket, or a supplementary group membership that make up the uniqueness of a given user\&. On a Linux system the user\*(Aqs
\fIUID\fR
and
\fIGID\fR\*(Aqs are credentials too\&. However, it has been decided that these properties (along with the default supplementary groups of which the user is a member) are credentials that should be set directly by the application and not by PAM\&. Such credentials should be established, by the application, prior to a call to this function\&. For example,
\fBinitgroups\fR(2)
(or equivalent) should have been performed\&.
.PP
Valid
\fIflags\fR, any one of which, may be logically OR\*(Aqd with
\fBPAM_SILENT\fR, are:
.PP
PAM_ESTABLISH_CRED
.RS 4
Initialize the credentials for the user\&.
.RE
.PP
PAM_DELETE_CRED
.RS 4
Delete the user\*(Aqs credentials\&.
.RE
.PP
PAM_REINITIALIZE_CRED
.RS 4
Fully reinitialize the user\*(Aqs credentials\&.
.RE
.PP
PAM_REFRESH_CRED
.RS 4
Extend the lifetime of the existing credentials\&.
.RE
.SH "RETURN VALUES"
.PP
PAM_BUF_ERR
.RS 4
Memory buffer error\&.
.RE
.PP
PAM_CRED_ERR
.RS 4
Failed to set user credentials\&.
.RE
.PP
PAM_CRED_EXPIRED
.RS 4
User credentials are expired\&.
.RE
.PP
PAM_CRED_UNAVAIL
.RS 4
Failed to retrieve user credentials\&.
.RE
.PP
PAM_SUCCESS
.RS 4
Data was successful stored\&.
.RE
.PP
PAM_SYSTEM_ERR
.RS 4
A NULL pointer was submitted as PAM handle, the function was called by a module or another system error occurred\&.
.RE
.PP
PAM_USER_UNKNOWN
.RS 4
User is not known to an authentication module\&.
.RE
.SH "SEE ALSO"
.PP
\fBpam_authenticate\fR(3),
\fBpam_open_session\fR(3),
\fBpam_close_session\fR(3),
\fBpam_strerror\fR(3)