Bug #76928 [Com]: Unable to connect via TLS 1.2
Edit report at https://bugs.php.net/bug.php?id=76928&edit=1
ID: 76928
Comment by: tbk at jjtc dot eu
Reported by: post at rolandgruber dot de
Summary: Unable to connect via TLS 1.2
Status: Open
Type: Bug
Package: IMAP related
Operating System: Linux
PHP Version: 7.2.10
Block user comment: N
Private report: N
New Comment:
I ran into the same issue when trying to setup NextCloud v14 with âExternal user supportâ
(user_external) IMAP authentication and trying to chase it down lead me down the rabbit hole.
Two PHP alternatives to php-imap/uw-imap:
Rough "user space" implementation of uw-imap - https://www.drupal.org/files/issues/mailhandler.user_imap.patch
Horde IMAP Client library - https://wiki.horde.org/Project/HordeImapLib
History time... Here we go!
Mark Crispin the inventor of the IMAP protocol and creator of imap
(imap-uw/uw-imap/lic-client/c-client) left UW (University of Washington) in 2008.
https://en.wikipedia.org/wiki/Mark_Crispin
https://www.washington.edu/imap/
https://en.wikipedia.org/wiki/UW_IMAP
After he left UW he created a fork called Panda IMAP. Development stopped in 2012 when Mark Crispin
passed away.
https://web.archive.org/web/20120716204450/http://panda.com/imap/changes.html
The latest version of the source (from 2012) was made available by Jonathan Abbey is available at https://github.com/jonabbey/panda-imap
According to this PR comment in a Panda IMAP fork by nkhorman https://github.com/nkhorman/panda-imap/issues/1#issuecomment-294192075
jonabbey also passed away so Panda IMAP is also left without a maintainer.
There are a ton of different patches and forks by different distros/people/projects. To put it
bluntly it is a complete mess and I believe it would benefit all if the efforts were consolidated.
Forks & patches:
https://repo.or.cz/alpine.git/history/HEAD:/imap
https://svnweb.freebsd.org/ports/head/mail/panda-imap/
https://svnweb.freebsd.org/ports/head/mail/panda-cclient/
https://svnweb.freebsd.org/ports/head/mail/imap-uw/files/
https://reviews.freebsd.org/D4108
https://github.com/openembedded/meta-openembedded/tree/master/meta-oe/recipes-devtools/uw-imap
https://github.com/slimlv/panda-imap/commits/master
https://github.com/nkhorman/panda-imap/commits/master
https://github.com/sequenced/panda-imap/commits/master
https://www.sequencedsystems.com/
https://sources.debian.org/patches/uw-imap/8:2007f~dfsg-5/
https://github.com/openwrt/packages/tree/master/libs/uw-imap/patches
https://gitweb.gentoo.org/repo/gentoo.git/tree/net-libs/c-client/files
https://src.fedoraproject.org/rpms/uw-imap/tree/master
http://mailman13.u.washington.edu/pipermail/imap-uw/
Some of the GitHub forks have TLSv1.2 and the Alpine fork (includes c-client) by Eduardo Chappa has
TLSv1.3 support.
An alternative to "fixing" Panda IMAP would be to rewrite php-imap based upon another lib
e.g. https://github.com/KDE/kimap2,
https://github.com/MailCore/mailcore2 or https://github.com/dovecot/imaptest/tree/master/src
Previous Comments:
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[2018-09-25 22:02:38] spam2 at rhsoft dot net
be happy when it works at all and use some proxy in localhost which handles the encryption over wire
https://bugzilla.redhat.com/show_bug.cgi?id=1609777
here after upgrade to Fedora 28 the extension without even touchd it is enough that a graceful
reload leads in an endless loop of httpd crashes
sadly there is no useable replacement for my usecase testing mail servers for example if imap/pop3
deliver the same content since we had troubles of that sort in production and so tests exists with
php-imap
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[2018-09-25 21:09:16] aurelien dot grimal at tech-tips dot fr
The problem is only concerning IMAP with StartTLS (port 143) and not direct SSL on IMAPS (port 993).
So IMAP with StartTLS can't use further than TLS1.0, and IMAP on SSL can use TLS1.2.
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[2018-09-24 18:04:42] post at rolandgruber dot de
Description:
------------
It seems that the PHP IMAP module depends on some old library (libc-client2007e) that does not
support TLS v1.2. On imap_open() an error "TLS/SSL failure for <my_imap_server>: SSL
negotiation failed" is reported.
Please support recent TLS versions. This is also a security issue.
User report:
The IMAP server is running cyrus 2.5.
I had to modify the parameter tls_versions in /etc/imapd.conf from
tls_versions: tls1_2 to
tls_versions: tls1_0 tls1_1 tls1_2
to make the imapAccess work, which is less secure now.
Expected result:
----------------
IMAP connections with TLS v1.2 are working.
Actual result:
--------------
TLS/SSL failure for <my_imap_server>: SSL negotiation failed
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