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+.\"     Title: pam_sm_authenticate
+.\"    Author: 
+.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/>
+.\"      Date: 04/16/2008
+.\"    Manual: Linux-PAM Manual
+.\"    Source: Linux-PAM Manual
+.\"
+.TH "PAM_SM_AUTHENTICATE" "3" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual"
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.SH "NAME"
+pam_sm_authenticate - PAM service function for user authentication
+.SH "SYNOPSIS"
+.sp
+.ft B
+.nf
+#define PAM_SM_AUTH
+.fi
+.ft
+.sp
+.ft B
+.nf
+#include <security/pam_modules\.h>
+.fi
+.ft
+.HP 35
+.BI "PAM_EXTERN int pam_sm_authenticate(pam_handle_t\ *" "pamh" ", int\ " "flags" ", int\ " "argc" ", const\ char\ **" "argv" ");"
+.SH "DESCRIPTION"
+.PP
+The
+\fBpam_sm_authenticate\fR
+function is the service module\'s implementation of the
+\fBpam_authenticate\fR(3)
+interface\.
+.PP
+This function performs the task of authenticating the user\.
+.PP
+Valid flags, which may be logically OR\'d with
+\fIPAM_SILENT\fR, are:
+.PP
+PAM_SILENT
+.RS 4
+Do not emit any messages\.
+.RE
+.PP
+PAM_DISALLOW_NULL_AUTHTOK
+.RS 4
+Return
+\fBPAM_AUTH_ERR\fR
+if the database of authentication tokens for this authentication mechanism has a
+\fINULL\fR
+entry for the user\. Without this flag, such a
+\fINULL\fR
+token will lead to a success without the user being prompted\.
+.RE
+.SH "RETURN VALUES"
+.PP
+PAM_AUTH_ERR
+.RS 4
+Authentication failure\.
+.RE
+.PP
+PAM_CRED_INSUFFICIENT
+.RS 4
+For some reason the application does not have sufficient credentials to authenticate the user\.
+.RE
+.PP
+PAM_AUTHINFO_UNAVAIL
+.RS 4
+The modules were not able to access the authentication information\. This might be due to a network or hardware failure etc\.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+The authentication token was successfully updated\.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+The supplied username is not known to the authentication service\.
+.RE
+.PP
+PAM_MAXTRIES
+.RS 4
+One or more of the authentication modules has reached its limit of tries authenticating the user\. Do not try again\.
+.RE
+.SH "SEE ALSO"
+.PP
+
+\fBpam\fR(3),
+\fBpam_authenticate\fR(3),
+\fBpam_sm_setcred\fR(3),
+\fBpam_strerror\fR(3),
+\fBPAM\fR(8)