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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | LIMITATIONS | SECURITY CONSIDERATIONS | SEE ALSO | ACKNOWLEDGEMENTS | COLOPHON |
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SLAPPASSWD(8C) SLAPPASSWD(8C)
slappasswd - OpenLDAP password utility
SBINDIR/slappasswd [-v] [-u] [-g|-s secret|-T file] [-h hash]
[-c salt-format] [-n] [-o option[=value]]
Slappasswd is used to generate an userPassword value suitable for
use with ldapmodify(1), slapd.conf(5) rootpw configuration
directive or the slapd-config(5) olcRootPW configuration
directive.
-v enable verbose mode.
-u 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.
-s secret
The secret to hash. If this, -g and -T are absent, the
user will be prompted for the secret to hash. -s, -g and
-T are mutually exclusive flags.
-g Generate the secret. If this, -s and -T are absent, the
user will be prompted for the secret to hash. -s, -g and
-T are mutually exclusive flags. If this is present,
{CLEARTEXT} is used as scheme. -g and -h are mutually
exclusive flags.
-T "file"
Hash the contents of the file. If this, -g and -s are
absent, the user will be prompted for the secret to hash.
-s, -g and -T and mutually exclusive flags.
-h "scheme"
If -h is specified, one of the following RFC 2307 schemes
may be specified: {CRYPT}, {MD5}, {SMD5}, {SSHA}, and
{SHA}. The default is {SSHA}.
Note that scheme names may need to be protected, due to {
and }, from expansion by the user's command interpreter.
{SHA} and {SSHA} use the SHA-1 algorithm (FIPS 160-1), the
latter with a seed.
{MD5} and {SMD5} use the MD5 algorithm (RFC 1321), the
latter with a seed.
{CRYPT} uses the crypt(3).
{CLEARTEXT} indicates that the new password should be added
to userPassword as clear text. Unless {CLEARTEXT} is used,
this flag is incompatible with option -g.
-c crypt-salt-format
Specify the format of the salt passed to crypt(3) when
generating {CRYPT} passwords. This string needs to be in
sprintf(3) format and may include one (and only one) %s
conversion. This conversion will be substituted with a
string of 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.
-n Omit the trailing newline; useful to pipe the credentials
into a command.
-o option[=value]
Specify an option with a(n optional) value. Possible
generic options/values are:
module-path=<pathspec> (see `modulepath' in slapd.conf(5))
module-load="<filename> [<arguments>...]" (see `moduleload' in slapd.conf(5))
You can load a dynamically loadable password hash module by
using this option.
The practice of storing hashed passwords in userPassword violates
Standard Track (RFC 4519) 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 slapd(8).
It should also be noted that the behavior of crypt(3) is platform
specific.
Use of hashed passwords does not protect passwords during protocol
transfer. TLS or other eavesdropping protections should be in-
place before using LDAP simple bind.
The hashed password values should be protected as if they were
clear text passwords.
ldappasswd(1), ldapmodify(1), slapd(8), slapd.conf(5),
slapd-config(5), RFC 2307, RFC 4519, RFC 3112
"OpenLDAP Administrator's Guide"
(http://www.OpenLDAP.org/doc/admin/)
OpenLDAP Software is developed and maintained by The OpenLDAP
Project <http://www.openldap.org/>. OpenLDAP Software is derived
from the University of Michigan LDAP 3.3 Release.
This page is part of the OpenLDAP (an open source implementation
of the Lightweight Directory Access Protocol) project.
Information about the project can be found at
⟨http://www.openldap.org/⟩. If you have a bug report for this
manual page, see ⟨http://www.openldap.org/its/⟩. This page was
obtained from the project's upstream Git repository
⟨https://git.openldap.org/openldap/openldap.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-05.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
OpenLDAP LDVERSION RELEASEDATE SLAPPASSWD(8C)
Pages that refer to this page: ldapcompare(1), slapd.conf(5), slapd-config(5), slappw-argon2(5), slapd(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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