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.\"-
.\" Copyright (c) 2001 Networks Associates Technologies, Inc.
.\" All rights reserved.
.\"
.\" This software was developed for the FreeBSD Project by ThinkSec AS and
.\" NAI Labs, the Security Research Division of Network Associates, Inc.
.\" under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
.\" DARPA CHATS research program.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd November 27, 2001
.Dt PAM_SET_ITEM 3
.Os
.Sh NAME
.Nm pam_set_item ,
.Nm pam_get_item
.Nd setting authentication parameters
.Sh LIBRARY
.Lb libpam
.Sh SYNOPSIS
.In security/pam_modules.h
.Ft int
.Fn pam_set_item "pam_handle_t *pamh" "int type" "const void *item"
.Ft int
.Fn pam_get_item "const pam_handle_t *pamh" "int type" "const void **item"
.Sh DESCRIPTION
The
.Fn pam_set_item
and
.Fn pam_get_item
allow applications and modules to store and retrieve a variety of
authentication parameters, or
.Dq items .
Each item is identified by an integer constant.
The following items are defined:
.Bl -tag -width ".Dv PAM_USER_PROMPT"
.It Dv PAM_SERVICE
(string)
The name of the requesting service.
.It Dv PAM_USER
(string)
The name of the user the application wants to authenticate.
.It Dv PAM_USER_PROMPT
(string)
The string which will be used to prompt the user for an authentication
token.
.It Dv PAM_TTY
(string)
The name of the current terminal (for terminal-oriented applications)
or display (for X11 applications).
.It Dv PAM_RUSER
(string)
The name of the requesting user.
.It Dv PAM_RHOST
(string)
The name of the host the requesting user is logging in from.
.It Dv PAM_AUTHTOK
(opaque)
The current authentication token.
This item is only accessible from PAM modules.
.It Dv PAM_OLDAUTHTOK
(opaque)
The expired authentication token.
This item is only accessible from PAM modules.
.It Dv PAM_CONV
.Pq Vt "struct pam_conv"
The current conversation function.
The
.Vt pam_conv
structure is defined as follows:
.Bd -literal
struct pam_conv {
int (*conv)(int num_msg,
const struct pam_message **msg,
struct pam_response **resp,
void *appdata_ptr);
void *appdata_ptr;
};
.Ed
.It Dv PAM_FAIL_DELAY
.Pq Vt delay_fn
A pointer to a callback function that should be called when a module
wants to introduce a delay after a failed authentication to discourage
brute-force attacks.
.El
.Sh RETURN VALUES
The
.Fn pam_set_item
and
.Fn pam_get_item
functions return one of the following values:
.Bl -tag -width ".Dv PAM_SYSTEM_ERR"
.It Dv PAM_SUCCESS
The operation succeeded.
.It Dv PAM_SYSTEM_ERR
The
.Fa pamh
argument was invalid.
.It Dv PAM_BUF_ERR
A call to
.Xr malloc 3
failed, or the
.Fa item
argument to
.Fn pam_get_item
was
.Dv NULL .
.It Dv PAM_BAD_ITEM
The specified
.Fa item
does not exist or is not accessible to the caller.
.El
.Pp
The
.Xr pam_strerror 3
function can be used to translate these return codes to descriptive
messages.
.Sh SEE ALSO
.Xr pam_start 3 ,
.Xr pam_strerror 3 ,
.Xr pam 8
.Sh STANDARDS
.Rs
.%T "DCE-RFC 86.0"
.%D "October 1995"
.Re
.Pp
Note: the
.Dv PAM_USER_PROMPT
and
.Dv PAM_FAIL_DELAY
items are non-standard extensions.
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