3a0c68edfd
The algorithm used is essentially PBKDF1 from RFC 2898 but using hmac_sha1 rather than SHA1 directly (suggested by smb@research.att.com). * The format of the encrypted password is: * $<tag>$<iterations>$<salt>$<digest> * * where: * <tag> is "sha1" * <iterations> is an unsigned int identifying how many rounds * have been applied to <digest>. The number * should vary slightly for each password to make * it harder to generate a dictionary of * pre-computed hashes. See crypt_sha1_iterations. * <salt> up to 64 bytes of random data, 8 bytes is * currently considered more than enough. * <digest> the hashed password. hmac.c implementes HMAC as defined in RFC 2104 and includes a unit test for both hmac_sha1 and hmac_sha1 using a selection of the Known Answer Tests from RFC 2202. It is worth noting that to be FIPS compliant the hmac key (password) should be 10-20 chars.
109 lines
3.4 KiB
Groff
109 lines
3.4 KiB
Groff
.\" $NetBSD: passwd.conf.5,v 1.7 2004/07/02 00:05:23 sjg Exp $
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.\"
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.\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Niels Provos.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 30, 2000
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.Dt PASSWD.CONF 5
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.Os
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.Sh NAME
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.Nm passwd.conf
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.Nd password encryption configuration file
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.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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The
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.Pa /etc/passwd.conf
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file, consisting of
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.Dq stanzas ,
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describes the configuration of the password cipher used
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to encrypt local or YP passwords.
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.Pp
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There are default, user and group specific stanzas.
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If no user or group
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stanza to a specific option is available, the default stanza
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is used.
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.Pp
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To differentiate between user and group stanzas, groups are prefixed
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with a single colon
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.Pq Sq \&: .
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.Pp
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Some fields and their possible values that can appear in this file are:
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.Bl -tag -width localcipher
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.It Sy localcipher
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The cipher to use for local passwords.
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Possible values are:
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.Dq old ,
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.Dq newsalt,\*[Lt]rounds\*[Gt] ,
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.Dq md5 ,
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.Dq sha1,\*[Lt]rounds\*[Gt] ,
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and
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.Dq blowfish,\*[Lt]rounds\*[Gt] .
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For
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.Dq newsalt
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the value of rounds is a 24-bit integer with a minimum of 7250 rounds.
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For
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.Dq sha1
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the value of rounds is a 32-bit integer, 0 means use the default
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of 24680.
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For
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.Dq blowfish
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the value can be between 4 and 31.
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It specifies the base 2 logarithm of the number of rounds.
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.It Sy ypcipher
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The cipher to use for YP passwords.
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The possible values are the same as for localcipher.
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.El
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.Pp
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To retrieve information from this file use
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.Xr pw_getconf 3 .
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.Sh FILES
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.Bl -tag -width /etc/passwd.conf -compact
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.It Pa /etc/passwd.conf
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.El
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.Sh EXAMPLES
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Use MD5 as the local cipher and old-style DES as the YP cipher.
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Use blowfish with 2^5 rounds for root:
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.Bd -literal
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default:
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localcipher = md5
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ypcipher = old
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root:
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localcipher = blowfish,5
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.Ed
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.Sh SEE ALSO
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.Xr passwd 1 ,
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.Xr pw_getconf 3 ,
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.Xr passwd 5
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.Sh HISTORY
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The
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.Nm
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configuration file first appeared in
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.Nx 1.6 .
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