Bug 1856289

Summary: [kuryr] hostnetwork pod can access MCS port 22623 or 22624 on master
Product: OpenShift Container Platform Reporter: Michał Dulko <mdulko>
Component: NetworkingAssignee: Michał Dulko <mdulko>
Networking sub component: kuryr QA Contact: GenadiC <gcheresh>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: high CC: juriarte, ltomasbo
Version: 4.6   
Target Milestone: ---   
Target Release: 4.6.0   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2020-10-27 16:13:56 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1856374    

Description Michał Dulko 2020-07-13 10:09:57 UTC
Description of problem:
hostnetwork pod can access MCS port 22623 or 22624 on master on Kuryr cluster. We should restrict that on Kuryr as well like it's done in OpenShiftSDN

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

How reproducible: Always

Steps to Reproduce:
1.Create a hostnetwork pod with kubeadmin as user
$ oc login -u kubeadmin -p xxxxx
$oc create -f https://raw.githubusercontent.com/anuragthehatter/v3-testfiles/master/networking/hostnetwork-pod.json

2.oc rsh into pod and curl on master IP on port 22623 and 22624

$ oc rsh hello-pod
 ~$curl -I -k
     HTTP/2 200 
 ~$curl -I -k
     HTTP/2 200 

Actual results: Hostnetwork pod can access MCS ports

Expected results: Hostnetwork pod should not access MCS ports

Comment 3 Jon Uriarte 2020-07-14 15:00:16 UTC
Verified in 4.6.0-0.nightly-2020-07-14-035247 on top of OSP 13 2020-07-09.1 puddle.

The MCS ports are not accessible from the hostnetwork pod in a cluster with Kuryr.

$ oc rsh hostnetwork-pod
/ # curl -I -k
curl: (7) Failed to connect to port 22623: Connection refused
/ # curl -I -k
curl: (7) Failed to connect to port 22624: Connection refused

Comment 5 errata-xmlrpc 2020-10-27 16:13:56 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 (OpenShift Container Platform 4.6 GA Images), and where to find the updated
files, follow the link below.

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