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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)