Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+PBKDF2 for OpenLDAP
+=======================
+
+pw-pbkdf2.c provides PBKDF2 key derivation functions in OpenLDAP.
+
+Schemes:
+
+ * {PBKDF2} -  alias to {PBKDF2-SHA1}
+ * {PBKDF2-SHA1}
+ * {PBKDF2-SHA256}
+ * {PBKDF2-SHA512}
+
+# Requirements
+
+  * OpenSSL 1.0.0 or later
+
+# Installations
+
+First, You need to configure and build OpenLDAP.
+
+    $ cd <OPENLDAP_BUILD_DIR>/contrib/slapd-modules/passwd/
+    $ git clone https://github.com/hamano/openldap-pbkdf2.git
+    $ cd openldap-pbkdf2/
+    $ make
+    # make install
+
+# Configration
+
+In slapd.conf:
+
+    moduleload pw-pbkdf2.so
+
+You can also tell OpenLDAP to use the schemes when processing LDAP
+Password Modify Extended Operations, thanks to the password-hash
+option in slapd.conf. For example:
+
+    password-hash {PBKDF2}
+or
+    password-hash {PBKDF2-SHA256}
+or
+    password-hash {PBKDF2-SHA512}
+
+# Testing
+
+You can get hash to use slappasswd.
+
+    $ slappasswd -o module-load=pw-pbkdf2.la -h {PBKDF2} -s secret
+    {PBKDF2}60000$Y6ZHtTTbeUgpIbIW0QDmDA$j/aU7jFKUSbH4UobNQDm9OEIwuw
+
+A quick way to test whether it's working is to customize the rootdn and
+rootpw in slapd.conf, eg:
+
+    rootdn "cn=Manager,dc=example,dc=com"
+    rootpw {PBKDF2}60000$Y6ZHtTTbeUgpIbIW0QDmDA$j/aU7jFKUSbH4UobNQDm9OEIwuw
+
+Then to test, run something like:
+
+    $ ldapsearch -x -b "dc=example,dc=com" -D "cn=Manager,dc=example,dc=com" -w secret
+
+# Debugging
+You can specify -DSLAPD_PBKDF2_DEBUG flag for debugging.
+
+# Message Format
+
+    {PBKDF2}<Iteration>$<Adapted Base64 Salt>$<Adapted Base64 DK>
+
+# References
+
+* [RFC 2898 Password-Based Cryptography][^1]
+[^1]: http://tools.ietf.org/html/rfc2898
+
+* [PKCS #5 PBKDF2 Test Vectors][^2]
+[^2]: http://tools.ietf.org/html/draft-josefsson-pbkdf2-test-vectors-06
+
+* [RFC 2307 Using LDAP as a Network Information Service][^3]
+[^3]: http://tools.ietf.org/html/rfc2307
+
+* [Python Passlib][^4]
+[^4]: http://pythonhosted.org/passlib/
+
+* [Adapted Base64 Encoding][^5]
+[^5]: http://pythonhosted.org/passlib/lib/passlib.utils.html#passlib.utils.ab64_encode
+
+# License
+This work is part of OpenLDAP Software <http://www.openldap.org/>.
+
+Copyright 2009-2021 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>.
+
+# ACKNOWLEDGEMENT
+This work was initially developed by HAMANO Tsukasa <hamano@osstech.co.jp>