RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1067752 - Bad interaction between postfix and OpenSSL >= 1.0.1
Summary: Bad interaction between postfix and OpenSSL >= 1.0.1
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: postfix
Version: 6.5
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Jaroslav Škarvada
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On:
Blocks: 1002711 1075802 1172231
TreeView+ depends on / blocked
 
Reported: 2014-02-21 00:44 UTC by Diego M. Vadell
Modified: 2019-10-10 09:14 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-12 15:41:42 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Diego M. Vadell 2014-02-21 00:44:22 UTC 
Description of problem: Postfix queues emails to some SMTP servers, at least some versions of MS Exchange.


 Postfix uses OpenSSL to make encrypted SMTP connections. Starting from version 1.0.1, OpenSSL enabled TLSv1.1 and TLSv1.2 by default. There are incompatibilities between the implementation of such protocols in other SSL stacks. 

    This is the postfix announcement:

http://www.postfix.org/announcements/postfix-2.9.2.html


Version-Release number of selected component (if applicable):
openssl-1.0.1e-16.el6_5.4.x86_64
postfix-2.6.6-6.el6_5.x86_64

How reproducible: Always (given we know a SMTP server with an incompatible TLS implementation)


Steps to Reproduce:
1. Configure postfix to use TLS. In main.conf, add this:
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file =  /etc/ssl/xxxxx.privkey
smtpd_tls_cert_file = /etc/ssl/xxxxx.cert
smtpd_tls_CAfile =    /etc/pki/CA/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s


2. Send an email to an email address handled by such remote SMTP server.

3. Check the mail queue, using the "mailq" command. It should be queued, with the following message:
(delivery temporarily suspended: lost connection with XXXXXXX while sending MAIL FROM)


Actual results: Mail gets queued.


Expected results: Mail gets delivered.


Additional info: I can't find anything related to this in the rpm's changelog.

Cheers,
 -- Diego.
Comment 3 Martin Poole 2015-11-12 14:14:09 UTC 
postfix in RHEL6 already supports the protocols options required to control link negotiation as per the postfix link.

Configuration details can be found in 

    Securing postfix on RHEL6
    https://access.redhat.com/articles/1469083
Comment 5 Jaroslav Škarvada 2015-11-12 15:41:42 UTC 
It seems there is nothing to fix in Postfix, configuration details/examples can be found in the KB article linked from comment 3, thus closing.
Note You need to log in before you can comment on or make changes to this bug.