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Argon2 OpenLDAP support
----------------------
pw-argon2.c provides support for ARGON2 hashed passwords in OpenLDAP. For
instance, one could have the LDAP attribute:
userPassword: {ARGON2}$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHQ$DKlexoEJUoZTmkAAC3SaMWk30El9/RvVhlqGo6afIng
or:
userPassword: {ARGON2}$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHRzYWx0$qOCkx9nMeFlaGOO4DUmPDgrlUbgMMuO9T1+vQCFuyzw
Both hash the password "secret", the first using the salt "saltsalt", the second using the salt "saltsaltsalt"
Building
--------
1) Customize the OPENLDAP variable in Makefile to point to the OpenLDAP
source root.
For initial testing you might also want to edit DEFS to define
SLAPD_ARGON2_DEBUG, which enables logging to stderr (don't leave this on
in production, as it prints passwords in cleartext).
2) Run 'make' to produce pw-argon2.so
3) Copy pw-argon2.so somewhere permanent.
4) Edit your slapd.conf (eg. /etc/ldap/slapd.conf), and add:
moduleload ...path/to/pw-argon2.so
5) Restart slapd.
Configuring
-----------
The {ARGON2} password scheme should now be recognised.
You can also tell OpenLDAP to use one of this scheme when processing LDAP
Password Modify Extended Operations, thanks to the password-hash option in
slapd.conf:
password-hash {ARGON2}
Testing
-------
A quick way to test whether it's working is to customize the rootdn and
rootpw in slapd.conf, eg:
rootdn "cn=admin,dc=example,dc=com"
# This hashes the string 'secret', with a random salt
rootpw {ARGON2}$argon2i$v=19$m=4096,t=3,p=1$uJyf0UfB25SQTfX7oCyK2w$U45DJqEFwD0yFaLvTVyACHLvGMwzNGf19dvzPR8XvGc
Then to test, run something like:
ldapsearch -b "dc=example,dc=com" -D "cn=admin,dc=example,dc=com" -x -w secret
-- Test hashes:
Test hashes can be generated with argon2:
$ echo -n "secret" | argon2 "saltsalt" -e
$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHQ$DKlexoEJUoZTmkAAC3SaMWk30El9/RvVhlqGo6afIng
$ echo -n "secret" | argon2 "saltsaltsalt" -e
$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHRzYWx0$qOCkx9nMeFlaGOO4DUmPDgrlUbgMMuO9T1+vQCFuyzw
$ echo -n "secretsecret" | argon2 "saltsalt" -e
$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHQ$U0Pd/wEsssZ9bHezDA8oxHnWe01xftykEy+7ehM2vic
$ echo -n "secretsecret" | argon2 "saltsaltsalt" -e
$argon2i$v=19$m=4096,t=3,p=1$c2FsdHNhbHRzYWx0$fkvoOwKgVtlX9ZDqcHFyyArBvqnAM0Igca8SScB4Jsc
Alternatively we could modify an existing user's password with
ldappasswd, and then test binding as that user:
$ ldappasswd -D "cn=admin,dc=example,dc=com" -x -W -S uid=jturner,ou=People,dc=example,dc=com
New password: secret
Re-enter new password: secret
Enter LDAP Password: <cn=admin's password>
$ ldapsearch -b "dc=example,dc=com" -D "uid=jturner,ou=People,dc=example,dc=com" -x -w secret
---
This work is part of OpenLDAP Software <http://www.openldap.org/>.
Copyright 2017-2021 The OpenLDAP Foundation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted only as authorized by the OpenLDAP
Public License.
A copy of this license is available in the file LICENSE in the
top-level directory of the distribution or, alternatively, at
<http://www.OpenLDAP.org/license.html>.
---
|
