[Samba] Stymied with samba vs openldap SSL ("Failed to issue the StartTLS instruction...")
Graham Allan
allan at physics.umn.edu
Wed Jan 6 20:56:57 UTC 2016
On 01/06/2016 01:34 PM, Lee Brown wrote:
> On Wed, Jan 6, 2016 at 10:36 AM, Graham Allan <allan at physics.umn.edu
> <mailto:allan at physics.umn.edu>> wrote:
>
> On 01/06/2016 09:53 AM, Graham Allan wrote:
>
>
> The packet dump is a good idea. I get the same failure using
> straight
> SSL to port 636, but wireshark might be able to decode any StartTLS
> negotiation attempt on the default port. Failing that I guess I'll
> resort to running smbd in gdb...
>
>
> tshark tells me the (smbd) client sends a decrypt error (TLS alert
> code 51) to the ldap server after receiving the certificate, while
> the working "ldapsearch -ZZ" moves on to client key exchange etc.
>
> Puzzling, it doesn't seem like a certificate validation error, I'd
> expect that to result in something like codes 42-48.
>
>
> I'd be very interested to see how you troubleshoot this. I'm running
> FreeBSD 10.1, samba 4.2.3, but I don't use openldap as the backend,
> samba is my LDAP now as it does Active Directory. I've found SSL to be
> incredibly hard to troubleshoot, especially when client certs get
> involved as it gets hard to determine if the problem is on the server
> side not liking the client cert, or the client side not liking the
> server cert. In some cases I've had to bundle the entire chain in a
> single file, while others I've had to point to a directory of certs.
gdb didn't give me much new, though for the record, it needed a couple
of things to be usable: (1) install newer gdb from ports, and (2) build
samba with --disable-pie
What I got from that was ldap_start_tls_s (ldap_struct, NULL, NULL) in
smb_ldap_start_tls is returning -11 (LDAP_CONNECT_ERROR), which doesn't
really help.
Maximum debugging on the ldap server gave me:
connection_read(3): TLS accept failure error=-1 id=1042, closing
conn=1042 fd=3 closed (TLS negotiation failure)
I'm out of ideas for now, other than maybe trying one of the openldap lists!
G.
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