Password encryption in OpenLDAP

Passwords in OpenLDAP are SSHA encrypted by default (salted SHA1).

Changing it to SHA512:

olcPasswordHash: {CRYPT},{SSHA}
olcPasswordCryptSaltFormat: "$6$%.16s"

This will still accept already existing passwords that are SSHA encrypted. New passwords will be SHA512 encrypted.

For this to work, the GNU C library has to support SHA512:
- /etc/login.defs: ENCRYPT_METHOD SHA512
- man pam_unix (should include sha512)

SHA512 passwords for LDAP can be generated with slappasswd:

slappasswd -c '$6$%.16s'