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+.\"     Title: pam_sm_setcred
+.\"    Author: 
+.\" Generator: DocBook XSL Stylesheets v1.70.1 <http://docbook.sf.net/>
+.\"      Date: 06/19/2006
+.\"    Manual: Linux\-PAM Manual
+.\"    Source: Linux\-PAM Manual
+.\"
+.TH "PAM_SM_SETCRED" "3" "06/19/2006" "Linux\-PAM Manual" "Linux\-PAM Manual"
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.SH "NAME"
+pam_sm_setcred \- PAM service function to alter credentials
+.SH "SYNOPSIS"
+.sp
+.ft B
+.nf
+#define PAM_SM_AUTH
+.fi
+.ft
+.sp
+.ft B
+.nf
+#include <security/pam_modules.h>
+.fi
+.ft
+.HP 30
+.BI "PAM_EXTERN int pam_sm_setcred(pam_handle_t\ *" "pamh" ", int\ " "flags" ", int\ " "argc" ", const\ char\ **" "argv" ");"
+.SH "DESCRIPTION"
+.PP
+The
+\fBpam_sm_setcred\fR
+function is the service module's implementation of the
+\fBpam_setcred\fR(3)
+interface.
+.PP
+This function performs the task of altering the credentials of the user with respect to the corresponding authorization scheme. Generally, an authentication module may have access to more information about a user than their authentication token. This function is used to make such information available to the application. It should only be called
+\fIafter\fR
+the user has been authenticated but before a session has been established.
+.PP
+Valid flags, which may be logically OR'd with
+\fIPAM_SILENT\fR, are:
+.TP 3n
+PAM_SILENT
+Do not emit any messages.
+.TP 3n
+PAM_DELETE_CRED
+Delete the credentials associated with the authentication service.
+.TP 3n
+PAM_REINITIALIZE_CRED
+Reinitialize the user credentials.
+.TP 3n
+PAM_REFRESH_CRED
+Extend the lifetime of the user credentials.
+.PP
+The way the
+\fBauth\fR
+stack is navigated in order to evaluate the
+\fBpam_setcred\fR() function call, independent of the
+\fBpam_sm_setcred\fR() return codes, is exactly the same way that it was navigated when evaluating the
+\fBpam_authenticate\fR() library call. Typically, if a stack entry was ignored in evaluating
+\fBpam_authenticate\fR(), it will be ignored when libpam evaluates the
+\fBpam_setcred\fR() function call. Otherwise, the return codes from each module specific
+\fBpam_sm_setcred\fR() call are treated as
+\fBrequired\fR.
+.SH "RETURN VALUES"
+.TP 3n
+PAM_CRED_UNAVAIL
+This module cannot retrieve the user's credentials.
+.TP 3n
+PAM_CRED_EXPIRED
+The user's credentials have expired.
+.TP 3n
+PAM_CRED_ERR
+This module was unable to set the credentials of the user.
+.TP 3n
+PAM_SUCCESS
+The user credential was successfully set.
+.TP 3n
+PAM_USER_UNKNOWN
+The user is not known to this authentication module.
+.PP
+These, non\-\fIPAM_SUCCESS\fR, return values will typically lead to the credential stack
+\fIfailing\fR. The first such error will dominate in the return value of
+\fBpam_setcred\fR().
+.SH "SEE ALSO"
+.PP
+
+\fBpam\fR(3),
+\fBpam_authenticate\fR(3),
+\fBpam_setcred\fR(3),
+\fBpam_sm_authenticate\fR(3),
+\fBpam_strerror\fR(3),
+\fBPAM\fR(8)