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+.\"     Title: pam_authenticate
+.\"    Author: 
+.\" Generator: DocBook XSL Stylesheets v1.70.1 <http://docbook.sf.net/>
+.\"      Date: 06/27/2006
+.\"    Manual: Linux\-PAM Manual
+.\"    Source: Linux\-PAM Manual
+.\"
+.TH "PAM_AUTHENTICATE" "3" "06/27/2006" "Linux\-PAM Manual" "Linux\-PAM Manual"
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.SH "NAME"
+pam_authenticate \- account authentication
+.SH "SYNOPSIS"
+.sp
+.ft B
+.nf
+#include <security/pam_appl.h>
+.fi
+.ft
+.HP 21
+.BI "int pam_authenticate(pam_handle_t\ *" "pamh" ", int\ " "flags" ");"
+.SH "DESCRIPTION"
+.PP
+The
+\fBpam_authenticate\fR
+function is used to authenticate the user. The user is required to provide an authentication token depending upon the authentication service, usually this is a password, but could also be a finger print.
+.PP
+The PAM service module may request that the user enter their username vio the the conversation mechanism (see
+\fBpam_start\fR(3)
+and
+\fBpam_conv\fR(3)). The name of the authenticated user will be present in the PAM item PAM_USER. This item may be recovered with a call to
+\fBpam_get_item\fR(3).
+.PP
+The
+\fIpamh\fR
+argument is an authentication handle obtained by a prior call to pam_start(). The flags argument is the binary or of zero or more of the following values:
+.TP 3n
+PAM_SILENT
+Do not emit any messages.
+.TP 3n
+PAM_DISALLOW_NULL_AUTHTOK
+The PAM module service should return PAM_AUTH_ERR if the user does not have a registered authentication token.
+.SH "RETURN VALUES"
+.TP 3n
+PAM_ABORT
+The application should exit immediately after calling
+\fBpam_end\fR(3)
+first.
+.TP 3n
+PAM_AUTH_ERR
+The user was not authenticated.
+.TP 3n
+PAM_CRED_INSUFFICIENT
+For some reason the application does not have sufficient credentials to authenticate the user.
+.TP 3n
+PAM_AUTHINFO_UNVAIL
+The modules were not able to access the authentication information. This might be due to a network or hardware failure etc.
+.TP 3n
+PAM_MAXTRIES
+One or more of the authentication modules has reached its limit of tries authenticating the user. Do not try again.
+.TP 3n
+PAM_SUCCESS
+The user was successfully authenticated.
+.TP 3n
+PAM_USER_UNKNOWN
+User unknown to authentication service.
+.SH "SEE ALSO"
+.PP
+
+\fBpam_start\fR(3),
+\fBpam_setcred\fR(3),
+\fBpam_chauthtok\fR(3),
+\fBpam_strerror\fR(3),
+\fBpam\fR(8)