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 $NetBSD: passwd.conf.5,v 1.13 2021/10/26 20:44:45 nia Exp $

 Copyright 1997 Niels Provos <provos (at] physnet.uni-hamburg.de>
 All rights reserved.

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.Dd October 26, 2021
.Dt PASSWD.CONF 5
.Os
.Sh NAME
.Nm passwd.conf
.Nd password encryption configuration file
.Sh SYNOPSIS
.Nm
.Sh DESCRIPTION
The

a /etc/passwd.conf
file, consisting of
.Dq stanzas ,
describes the configuration of the password cipher used
to encrypt local or YP passwords.

p
There are default, user and group specific stanzas.
If no user or group
stanza to a specific option is available, the default stanza
is used.

p
To differentiate between user and group stanzas, groups are prefixed
with a single colon

q Sq : .

p
Some fields and their possible values that can appear in this file are:
l -tag -width localcipher t Sy localcipher The cipher to use for local passwords.

p
Possible values are:
.Dq argon2d,<t=X,m=Y,p=Z> ,
.Dq argon2i,<t=X,m=Y,p=Z> ,
.Dq argon2id,<t=X,m=Y,p=Z> ,
.Dq old ,
.Dq newsalt,<rounds> ,
.Dq md5 ,
.Dq sha1,<rounds> ,
and
.Dq blowfish,<rounds> .

p
For
.Dq argon2d ,
.Dq argon2i ,
and
.Dq argon2id ,
optional hardness parameters can be specified as described in the
manual for
.Xr pwhash 1 .

p
For
.Dq newsalt
the value of rounds is a 24-bit integer with a minimum of 7250 rounds.

p
For
.Dq sha1
the value of rounds is a 32-bit integer, 0 means use the default
of 24680.

p
For
.Dq blowfish
the value can be between 4 and 31.
It specifies the base 2 logarithm of the number of rounds.

p
If not specified, the default value is
.Dq old .
t Sy ypcipher The cipher to use for YP passwords.

p
The possible values are the same as for localcipher.

p
If not specified, the default value is
.Dq old .
.El

p
To retrieve information from this file use
.Xr pw_getconf 3 .
.Sh FILES
l -tag -width /etc/passwd.conf -compact t Pa /etc/passwd.conf .El
.Sh EXAMPLES
Use SHA1 as the local cipher and old-style DES as the YP cipher.
Use blowfish with 2^5 rounds for root:
d -literal  default:
 localcipher = sha1
 ypcipher = old

 root:
 localcipher = blowfish,5
.Ed
.Sh SEE ALSO
.Xr passwd 1 ,
.Xr pwhash 1 ,
.Xr pw_getconf 3 ,
.Xr passwd 5
.Sh HISTORY
The
.Nm
configuration file first appeared in
.Nx 1.6 .

p
The default value of
.Sy localcipher
was set to
.Dq sha1
in

a /etc/passwd.conf
starting from
.Nx 6.0 .

p
The default value of
.Sy localcipher
was set to
.Dq argon2id 
in

a /etc/passwd.conf
starting from
.Nx 10.0 .