slappasswd(8) — Linux manual page


SLAPPASSWD(8C)                                                SLAPPASSWD(8C)

NAME         top

       slappasswd - OpenLDAP password utility

SYNOPSIS         top

       SBINDIR/slappasswd [-v] [-u] [-g|-s secret|-T file] [-h hash]
       [-c salt-format] [-n] [-o option[=value]]

DESCRIPTION         top

       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.

OPTIONS         top

       -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> (see `moduleload' in slapd.conf(5))

              You can load a dynamically loadable password hash module by
              using this option.

LIMITATIONS         top

       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

       It should also be noted that the behavior of crypt(3) is platform


       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.

SEE ALSO         top

       ldappasswd(1), ldapmodify(1), slapd(8), slapd.conf(5),
       slapd-config(5), RFC 2307, RFC 4519, RFC 3112

       "OpenLDAP Administrator's Guide" (


       OpenLDAP Software is developed and maintained by The OpenLDAP Project
       <>.  OpenLDAP Software is derived from the
       University of Michigan LDAP 3.3 Release.

COLOPHON         top

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OpenLDAP LDVERSION               RELEASEDATE                  SLAPPASSWD(8C)

Pages that refer to this page: ldapcompare(1)slapd.conf(5)slapd-config(5)slapd(8)