Bug 161826 - php-imap fails to connect to cyrus imap server
php-imap fails to connect to cyrus imap server
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: php (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Joe Orton
David Lawrence
Depends On:
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Reported: 2005-06-27 12:18 EDT by ed2019
Modified: 2010-10-21 23:06 EDT (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2008-12-10 12:55:16 EST
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RHEL 7.3 requirements from Atomic Host:
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Description ed2019 2005-06-27 12:18:52 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050517 Firefox/1.0.4 (Debian package 1.0.4-2)

Description of problem:
When attempting to connect to a Cyrus IMAP server, which has GSSAPI enabled, php imap fails with the following error messages:

PHP Notice:  (null)(): GSSAPI failure: Credentials cache permissions incorrect (errflg=1) in Unknown on line 0
PHP Notice:  (null)(): Can not authenticate to IMAP server: Client canceled authentication (errflg=2) in Unknown on line 0

This has been noticed by others as the c-client library (which underlies php-imap) trying to use GSSAPI in an impossible situation.
Potential fixes might include:
     imap_open having a switch or option which would signal c-client not to use GSSAPI
     c-client itself not trying to use gssapi when it won't work, or trying to use other methods (such as PLAIN) when it fails.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. PHP: $mbox = imap_open("{cyrusserver:993/imap/ssl/novalidate-cert/norsh}INBOX", "user", "pw");
2. Where cyrusserver is the remote cyrus imap server
3. observe the GSSAPI errors in the httpd/error_log

Actual Results:  imap_open fails, errors observed in the httpd/error_log .

Expected Results:  imap_open succeeds , no errors.

Additional info:
Comment 1 Joe Orton 2005-06-29 07:07:48 EDT
Thanks for the report and analysis.

Doing this as another mailbox flag would perhaps make sense.

From reading the code it looks like c-client *should* be trying the different
authentication methods if one fails, though.  Can you get a network trace of an
IMAP connection which fails like this (e.g. with ethereal) to demonstrate the
failure mode?
Comment 2 ed2019 2005-06-29 08:59:42 EDT
I don't think that such a network trace would be very useful, since we're doing
TLS.  I'm not able to disable TLS because the mail servers are in production.
Comment 3 ed2019 2005-06-29 09:07:59 EDT
I have opened a bug with PHP, #33500 , and also started a discussion on the
imap-uw mailing list, with the author of the c-client library, for references.

Comment 4 Joe Orton 2005-06-29 09:53:42 EDT
Actually it looks like the GSSAPI auth client code in c-client is written to
explicitly prevent retrying with a different mechanism;

The first thing auth_gssapi_client does:

  *trial = 65535;               /* never retry */

and hence the loop in imap4r1.c will never continue with a different authenticator.
Comment 6 RHEL Product and Program Management 2008-09-05 13:20:48 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 8 RHEL Product and Program Management 2008-12-10 12:55:16 EST
Development Management has reviewed and declined this request.  You may appeal
this decision by reopening this request.

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