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Connectionless LDAP (ie: cldap enabled with -DLDAP_CONNECTIONLESS) is broken for IPv6 for current versions of openldap. Tested with version 2.4.35

It's not clear if this ever worked properly.

Connections immediately fail with:

ldap_search_ext: Can't contact LDAP server (-1)

The reason for this is that the LDAP_CONNECTIONLESS buffers include a prefix containing an address in a "struct sockaddr". However, struct sockaddr, is not a concrete type. In particular struct sockaddr_in6 is longer than struct sockaddr.

Noted here: http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=blob;f=libraries/liblber/sockbuf.c;h=d997e92910954b943e5b3fe7139ff4caaeaf49bf;hb=HEAD#l886

So this leads to failures when using IPv6 as the code assumes that the address length is equal to sizeof (struct sockaddr). Seen here:

http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=blob;f=libraries/liblber/sockbuf.c;h=d997e92910954b943e5b3fe7139ff4caaeaf49bf;hb=HEAD#l940

Example command:

$ ldapsearch -d -1 -LL -H 'cldap://[2620:52:0:2223::1:1]' -b '' -s base '(&(DnsDomain=ad.baseos.qe)(NtVer=\06\00\00\00))' NetLogon

Output will contain this:

ldap_write: want=96 error=Invalid argument

Which is the EINVAL resulting from bad value passed to sendto().

Created attachment 796913 [details]
Patch for openldap 2.4.35

I'm quite reluctant to apply this patch without it being upstreamed first.

The fixes have landed in upstream git.

Fix pushed to 'private-jsynacek-rhel-7-cldap-fix'.

http://pkgs.devel.redhat.com/cgit/rpms/openldap/commit/?h=private-jsynacek-rhel-7-cldap-fix&id=80e0e83b19c3bcbe04b91de9019a27c689d5bd54

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.