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Bug 1921283

Summary: fix MCS blocking iptables rules
Product: OpenShift Container Platform Reporter: Dan Winship <danw>
Component: NetworkingAssignee: Dan Winship <danw>
Networking sub component: ovn-kubernetes QA Contact: Kedar Kulkarni <kkulkarn>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: urgent CC: anbhat, bbennett, ealcaniz, kholtz, kkulkarn, mmethot, openshift-bugzilla-robot, rkhan
Version: 4.7   
Target Milestone: ---   
Target Release: 4.5.z   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Cause: An incorrect ovn-kubernetes security rule that was supposed to only block outbound connections also blocked some inbound connections. Consequence: In the general case, around 1 in 10,000 attempts to connect to a pod would fail spuriously. However, if a client intentionally used a restricted range of source ports, it could hit the buggy rule more frequently. Fix: The iptables rule was fixed to only block the intended connections. Result: No spurious failures.
 Story Points: ---
Clone Of: 1921274 Environment:
Last Closed: 2021-03-03 04:40:35 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1921274    
Bug Blocks:    

Comment 2 Kedar Kulkarni 2021-02-11 16:09:36 UTC 

Hi,
I was able to verify the BZ on OVN cluster using `curl` command to curl 172.30.0.1 as per the instructions. Here's the snippet of one of the curl calls:

===========================================================================================
oc run -it --rm curlpod --image=curlimages/curl -- /bin/sh
If you don't see a command prompt, try pressing enter.

/ $ curl --local-port 22624 https://172.30.0.1/
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
===========================================================================================

Nightly Build used: 4.5.0-0.nightly-2021-02-11-024848


Thanks,
KK.
Comment 5 errata-xmlrpc 2021-03-03 04:40:35 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: OpenShift Container Platform 4.5.33 bug fix and security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:0428