ando@sys-net.it wrote: > mbackes@symas.com wrote:

The reason is quite simple: set expansion uses the rewritten DN as the user's name, so a local lookup of the entry "cn=user,dc=remote" fails since no local database serves the naming context "dc=remote". The root cause is that back-ldap binds as the rewritten DN, which is later stored as the real identity. I think this was done on purpose, and is to some extent appropriate, but makes the type of ACL you want to design basically impossible. A solution would be to make slapo-rwm intercept successful binds (in the cleanup callback) and rewrite back the bound DN into the virtual naming context. I'll see if it is possible, but then we need to decide whether this is the desired behavior. Otherwise, we'd need to have two o_ndn fields: the real DN and the real-real DN.

To further elaborate, even if the virtual DN is set instead of the real one in c_ndn, the operation fails because ACL checking passes through bi_entry_get_rw(), which is not provided by slapo-rwm, and can't be provided according to the current design, since it does not allow to massage the arguments. As a quick'n'dirty fix, what you can do is make the proxy database serve both naming contexts, namely

database ldap suffix "dc=remote,dc=local" suffix "dc=remote" uri "ldap://127.0.0.1:2389" acl-bind bindmethod=simple binddn="cn=user,dc=remote" credentials=secret overlay rwm rwm-suffixmassage "dc=remote,dc=local" "dc=remote"

This allows the proxy database to be found by select_backend() when searching the right backend using the real naming context. At the same time, internal searches occur as expected.

This is a hack; the real fix requires to redesign the API of bi_entry_get_rw(), to let it modify the request arguments while letting the real function do the hard job.

p.

Ing. Pierangelo Masarati OpenLDAP Core Team

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