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Bug 1085379 - rsyslog gssapi functionality gets broken with InputGSSServerPermitPlainTCP
Summary: rsyslog gssapi functionality gets broken with InputGSSServerPermitPlainTCP
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: rsyslog
Version: 7.0
Hardware: Unspecified
OS: Unspecified
low
medium
Target Milestone: rc
: ---
Assignee: Radovan Sroka
QA Contact: Stefan Dordevic
URL:
Whiteboard:
Depends On:
Blocks: 1295396 1296594 1313485
TreeView+ depends on / blocked
 
Reported: 2014-04-08 13:24 UTC by Karel Srot
Modified: 2017-08-24 14:08 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 867016
: 1481116 (view as bug list)
Environment:
Last Closed: 2017-08-24 14:08:36 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Karel Srot 2014-04-08 13:24:22 UTC 
Test results for rhel-7, rsyslog-7.4.7-6.el7.x86_64:

1) server accepts gssapi only && client sends gssapi only:
works fine

2) server accepts gssapi only && client sends tcp/plain only:
works as expected

3) server accepts gssapi only && clients sends both gssapi and tcp/plain:
works as expected

4) server accepts both gssapi and tcp/plain, client sends gssapi messages:
gssapi messages are not delivered!!!

5) server accepts both gssapi and tcp/plain, client sends plain messages only:
plaintext only messages can be delivered with $InputGSSServerPermitPlainTCP on, but the log is flooded with netstream session errors

6)  server accepts both gssapi and tcp/plain, client sends both gssapi and plain messages
gssapi messages are not delivered because of issues in client-server
communication. But tcp/plain messages sent by netcat were delivered.


+++ This bug was initially created as a clone of Bug #867016 +++

Description of problem:

rsyslogd crashes or hangs or looses log messages in various configurations.
This is a bit complex problem.

rsyslogd can be configured using InputGSSServerPermitPlainTCP on to accept both gssapi and tcp/plain messages. I have tested following 6 scenarios:

1) server accepts gssapi only && client sends gssapi only:
works fine except AVC denials reported as bug 867001

2) server accepts gssapi only && client sends tcp/plain only:
rsyslog crashes, this is reported as bug 862517.

3) server accepts gssapi only && clients sends both gssapi and tcp/plain:
again, rsyslog crashes 

4) server accepts both gssapi and tcp/plain, client sends gssapi messages:
gssapi messages are not delivered

5) server accepts both gssapi and tcp/plain, client sends plain messages only:
plaintext only messages can be delivered with $InputGSSServerPermitPlainTCP on, but the log is flooded with netstream session errors

6)  server accepts both gssapi and tcp/plain, client sends both gssapi and plain messages
nor tcp nor gssapi messages are delivered because of issues in client-server
communication. But tcp/plain messages sent by netcat were delivered.


Version-Release number of selected component (if applicable):
rsyslog-5.8.10-2.el6

How reproducible:
always

Steps to Reproduce:
It is pretty complicated. I started with http://www.rsyslog.com/doc/gssapi.html
but I would recommend to contact me.
Comment 2 Karel Srot 2014-04-08 13:29:46 UTC 
Small update:

3) server accepts gssapi only && clients sends both gssapi and tcp/plain:
gssapi messages delivered, plain messages are causing following log messages to appear:
  GSS-API error reading token data
  TCP session 0x7fe148120c90 will be closed, error ignored
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