slappasswd(8)

1SLAPPASSWD(8C)                                                  SLAPPASSWD(8C)
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NAME

6       slappasswd - OpenLDAP password utility
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SYNOPSIS

9       /usr/sbin/slappasswd   [-v]   [-u]   [-g|-s secret|-T file]   [-h hash]
10       [-c salt-format] [-n]
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DESCRIPTION

13       Slappasswd is used to generate an userPassword value suitable  for  use
14       with ldapmodify(1), slapd.conf(5) rootpw configuration directive or the
15       slapd-config(5) olcRootPW configuration directive.
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OPTIONS

18       -v     enable verbose mode.
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20       -u     Generate RFC 2307 userPassword  values  (the  default).   Future
21              versions  of  this  program may generate alternative syntaxes by
22              default.  This option is provided for forward compatibility.
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24       -s secret
25              The secret to hash.  If this, -g and -T  are  absent,  the  user
26              will  be  prompted  for  the  secret to hash.  -s, -g and -T are
27              mutually exclusive flags.
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29       -g     Generate the secret.  If this, -s and -T are  absent,  the  user
30              will  be  prompted  for  the  secret to hash.  -s, -g and -T are
31              mutually exclusive flags.  If this is  present,  {CLEARTEXT}  is
32              used as scheme.  -g and -h are mutually exclusive flags.
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34       -T "file"
35              Hash  the  contents of the file.  If this, -g and -s are absent,
36              the user will be prompted for the secret to hash.  -s, -g and -T
37              and mutually exclusive flags.
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39       -h "scheme"
40              If -h is specified, one of the following RFC 2307 schemes may be
41              specified: {CRYPT},  {MD5},  {SMD5},  {SSHA},  and  {SHA}.   The
42              default is {SSHA}.
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44              Note that scheme names may need to be protected, due to { and },
45              from expansion by the user's command interpreter.
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47              {SHA} and {SSHA} use the SHA-1 algorithm (FIPS 160-1), the  lat‐
48              ter with a seed.
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50              {MD5}  and  {SMD5}  use the MD5 algorithm (RFC 1321), the latter
51              with a seed.
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53              {CRYPT} uses the crypt(3).
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55              {CLEARTEXT} indicates that the new password should be  added  to
56              userPassword  as  clear  text.  Unless {CLEARTEXT} is used, this
57              flag is incompatible with option -g.
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59       -c crypt-salt-format
60              Specify the format of the salt passed to crypt(3) when  generat‐
61              ing  {CRYPT}  passwords.   This string needs to be in sprintf(3)
62              format and may include one (and only one) %s  conversion.   This
63              conversion  will  be substituted with a string of random charac‐
64              ters from [A-Za-z0-9./].  For example,  '%.2s'  provides  a  two
65              character  salt and '$1$%.8s' tells some versions of crypt(3) to
66              use an MD5 algorithm and provides 8 random characters  of  salt.
67              The default is '%s', which provides 31 characters of salt.
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69       -n     Omit the trailing newline; useful to pipe the credentials into a
70              command.
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LIMITATIONS

73       The practice of storing hashed passwords in userPassword violates Stan‐
74       dard  Track  (RFC 4519) schema specifications and may hinder interoper‐
75       ability.  A new attribute type, authPassword, to hold hashed  passwords
76       has been defined (RFC 3112), but is not yet implemented in slapd(8).
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78       It  should also be noted that the behavior of crypt(3) is platform spe‐
79       cific.
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SECURITY CONSIDERATIONS

82       Use of hashed passwords does  not  protect  passwords  during  protocol
83       transfer.   TLS  or  other eavesdropping protections should be in-place
84       before using LDAP simple bind.
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86       The hashed password values should be protected as if  they  were  clear
87       text passwords.
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ACKNOWLEDGEMENTS

96       OpenLDAP Software is developed and maintained by The  OpenLDAP  Project
97       <http://www.openldap.org/>.   OpenLDAP Software is derived from Univer‐
98       sity of Michigan LDAP 3.3 Release.
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102OpenLDAP 2.4.23                   2010/06/30                    SLAPPASSWD(8C)