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Re: (ITS#6610) Client receives SIGPIPE when connected via ldapi with TLS
- To: openldap-its@OpenLDAP.org
- Subject: Re: (ITS#6610) Client receives SIGPIPE when connected via ldapi with TLS
- From: firstname.lastname@example.org
- Date: Thu, 29 Jul 2010 09:33:59 GMT
- Auto-submitted: auto-generated (OpenLDAP-ITS)
> Full_Name: Jan Zeleny
> Version: 2.4.23
> OS: Linux
> URL: http://jzeleny.fedorapeople.org/debug/openldap/sigpipe-traces.tar.bz2
> Submission from: (NULL) (188.8.131.52)
> When running slapd listening on local socket (ldapi:///), clients connecting to
> it will sometimes SIGPIPE when using TLS. This happens in about 70% times.
> How to reproduce:
> generate a pem certificate
> slapd -h ldapi:///
> ldapsearch -H ldapi:/// -ZZ -x -d -1
> I'm attaching straces from both slapd and ldapsearch. What seems to be happening
> is that slapd receives EAGAIN during the read from socket, marks it for another
> read, but then terminates a reading thread and closes the connection, while
> client still wants to write some data. When doing ldapsearch, it does this after
> result was returned, that's why it can be seen probably only in debugging mode.
> The issue was originally reported on 2.3.43, but I successfully reproduced it on
> newer versions, including 2.4.23. The only exception was Fedora rawhide version
> (currently 2.4.22), which is built with NSS instead of OpenSSL. NSS (and NSPR)
> doesn't seem to support local sockets at all, so it is not possible to use ldapi
> with -ZZ any more.
Not sure this is worth investigating, since there's no reason to use TLS on
ldapi://, and as you already said, it won't even be possible with the upcoming
> I'm attaching straces from both successful and unsuccessful run. For complete
> information here is URL of relevant redhat bugzilla:
In regards to the original report, just leave ssl off in the nss_ldap config.
Use the starttls URL extension instead.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/