openldap/doc/man/man8/slappasswd.8

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.TH SLAPPASSWD 8C "RELEASEDATE" "OpenLDAP LDVERSION"
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.\" $OpenLDAP$
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.\" Copyright 1998-2004 The OpenLDAP Foundation All Rights Reserved.
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.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
.SH NAME
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slappasswd \- OpenLDAP password utility
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.SH SYNOPSIS
.B SBINDIR/slappasswd
.B [\-v]
.B [\-u]
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.B [\-s secret|\-T file]
.B [\-h hash]
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.B [\-c salt-format]
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.B
.LP
.SH DESCRIPTION
.LP
.B Slappasswd
is used to generate an userPassword value
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suitable for use with
.BR ldapmodify (1)
or
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.BR slapd.conf (5)
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.I rootpw
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configuration directive.
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.SH OPTIONS
.TP
.B \-v
enable verbose mode.
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.TP
.B \-u
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Generate RFC 2307 userPassword values (the default). Future
versions of this program may generate alternative syntaxes
by default. This option is provided for forward compatibility.
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.TP
.BI \-s " secret"
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The secret to hash.
If this and
.B \-T
are absent, the user will be prompted for the secret to hash.
.B \-s
and
.B \-T
and mutually exclusive flags.
.TP
.BI \-T " file"
Hash the contents of the file.
If this and
.B \-s
are absent, the user will be prompted for the secret to hash.
.B \-s
and
.B \-T
and mutually exclusive flags.
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.TP
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.BI \-h " scheme"
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If -h is specified, one of the following RFC 2307 schemes may
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be specified:
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.IR {CRYPT} ,
.IR {MD5} ,
.IR {SMD5} ,
.IR {SSHA} ", and"
.IR {SHA} .
The default is
.IR {SSHA} .
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Note that scheme names may need to be protected, due to
.B {
and
.BR } ,
from expansion by the user's command interpreter.
.B {SHA}
and
.B {SSHA}
use the SHA-1 algorithm (FIPS 160-1), the latter with a seed.
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.B {MD5}
and
.B {SMD5}
use the MD5 algorithm (RFC 1321), the latter with a seed.
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.B {CRYPT}
uses the
.BR crypt (3).
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.B {CLEARTEXT}
indicates that the new password should be added to userPassword as
clear text.
.TP
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.BI \-c " crypt-salt-format"
Specify the format of the salt passed to
.BR crypt (3)
when generating {CRYPT} passwords.
This string needs to be in
.BR sprintf (3)
format and may include one (and only one) %s conversion.
This conversion will be substituted with a string random
characters from [A\-Za\-z0\-9./]. For example, "%.2s"
provides a two character salt and "$1$%.8s" tells some
versions of crypt(3) to use an MD5 algorithm and provides
8 random characters of salt. The default is "%s", which
provides 31 characters of salt.
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.SH LIMITATIONS
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The practice storing hashed passwords in userPassword violates
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Standard Track (RFC 2256) schema specifications and may hinder
interoperability. A new attribute type, authPassword, to hold
hashed passwords has been defined (RFC 3112), but is not yet
implemented in
.BR slapd (8).
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.TP
It should also be noted that the behavior of
.BR crypt (3)
is platform specific.
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.SH "SECURITY CONSIDERATIONS"
Use of hashed passwords does not protect passwords during
protocol transfer. TLS or other eavesdropping protections
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should be in\-place before using LDAP simple bind.
.TP
The hashed password values should be protected as if they
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were clear text passwords.
.SH "SEE ALSO"
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.BR ldappasswd (1),
.BR ldapmodify (1),
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.BR slapd (8)
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.BR slapd.conf (5)
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.B RFC 2307
.B RFC 2256
.B RFC 3112
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.LP
"OpenLDAP Administrator's Guide" (http://www.OpenLDAP.org/doc/admin/)
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.SH ACKNOWLEDGEMENTS
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OpenLDAP is developed and maintained by
The OpenLDAP Project (http://www.openldap.org/).
OpenLDAP is derived from University of Michigan LDAP 3.3 Release.