I've been trying to get using groups working in ACLs, but no matter what I do the group ACL isn't applied. It seems it might be a LMDB bug, and I'm planning on switching to hdb to see if it works there when I get the time.
I've attached the olcAccess.ldif that doesn't work and the output of
slapacl -D uid=kyrias,ou=users,dc=kyriasis,dc=com \ -b ou=users,dc=kyriasis,dc=com -dacl
which shows that the group ACL isn't applied to the user uid=kyrias,ou=users,dc=kyriasis,dc=com even tho it is a member of the cn=admins,ou=security,dc=kyriasis,dc=com group and that the 'to *' ACL is above the other ones.