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From "IGOR VOLOSHANENKO (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-10200) ACL not applied for PrivateGateway inside ACL_INBOUND/OUTBOUND chains. Traffic blocked by next DROP rule
Date Wed, 20 Dec 2017 00:33:00 GMT
IGOR VOLOSHANENKO created CLOUDSTACK-10200:
----------------------------------------------

             Summary: ACL not applied for PrivateGateway inside ACL_INBOUND/OUTBOUND chains.
Traffic blocked by next DROP rule
                 Key: CLOUDSTACK-10200
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10200
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
          Components: Virtual Router
    Affects Versions: 4.10.0.0, 4.9.0, 4.11.0.0
         Environment: CloudStack with advanced network installation
            Reporter: IGOR VOLOSHANENKO
             Fix For: Future, 4.11.0.0


We found bug in ACL rules for PrivateGateway for VPC

At a glance - rules not applied - switching Allow All or Deny All (default ACL) - showed as
completed - but rules missed.
Result - traffic via PrivateGateway blocked by next DROP rule in next chains

How to reproduce:
1. Enable PrivateGateway for Cloudstack
2. Create VPC
3. Provision new PrivateGateway inside VPC with some VLAN
4. Change ACL (optional step to show that problem not in initial configuration but in config
itself)

Expected:
ACL rules applied (inserted) into correspondig ACL_INBOUND/OUTBOUND chanins for PrivateGateway
interface (ethX) based on ACL which user choose 

Current:
No rules inserted. ACL_INBOUND/OUTBOUND_ethX - empty. Traffic blocked by next DROP rule in
FORWARD chain

Affect - all our corporate customers blocked with access to their own nets via PG and vice-versa.

Root cause:
Issue happened because of CsNetFilter.py logic for inserting rules for ACL_INBOUND/OUTBOUND
chains.

We choose rule numebr to isnert right before last DROP rule - but forget about fact - that
if chain empty - we also return 0 as insert position. Which not true for iptables - numeration
started from 0.

So we need very small patch to handle this special case - if number of rules inside chain
equal to zero - return 1, else - return count of rules inside chain.

It's found only one - just because be default for PrivateGateway - we didn't insert any "service
rules" (if SourceNat for PrivateGteway not ticked) - and we have by default empty ACL_INBOUND/OUTBOUND
chains. Because same insert happened for all VPC networks (but when we call this insert -
we already have at least 1 rule inside chains - and we successfully can process)




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