Project

General

Profile

Actions
Copy link

Feature #6063

open

exception-policy: stream async policy

Added by Victor Julien about 1 year ago. Updated about 1 month ago.

Status:
Assigned
Priority:
Normal
Assignee:
OISF Dev
Target version:
7.0.7
Effort:
Difficulty:
Label:

Description

For streams that are using async routing, allow applying a separate exception policy.

Async detection would match the logic the async-oneside option uses today:

Client -> Server: SYN followed by ACK matching the 3whs. SEQ of this packet would be ISN+1. If no SYN/ACK has been seen we’d be in async mode.
Server -> Client: SYN/ACK as first packet.

In both cases we'd apply a new exception policy.

Suggested defaults:
- IDS: ignore
- IPS, async-oneside disabled: drop-packet (not drop flow as otherwise an injected packet might trigger a flow drop?)
- IPS, async-oneside enabled: ignore

Subtasks 1 (0 open — 1 closed)

Feature #6083: exception-policy: stream async policy (6.0.x backport)RejectedActions
Actions
Copy link
 #1

Updated by Victor Julien about 1 year ago

  • Label Needs backport to 6.0 added
Actions
Copy link
 #2

Updated by OISF Ticketbot about 1 year ago

  • Subtask #6083 added
Actions
Copy link
 #3

Updated by OISF Ticketbot about 1 year ago

  • Label deleted (Needs backport to 6.0)
Actions
Copy link
 #4

Updated by Victor Julien about 1 year ago

  • Target version changed from 7.0.0-rc2 to 7.0.1
Actions
Copy link
 #5

Updated by Jamie Lavigne about 1 year ago

I am curious about this one, could you provide some additional context on how this feature works?

I assume this is related to asymmetrically routed connections (not asynchronous) but I'm interested in how suricata would distinguish those and whether this would support matching connections where the client-to-server side of the connection is seen by suricata but the server-to-client side is not (i.e. what load balancers call "DSR", direct server return).

Today the existing midstream-policy matches on connections that are asymmetrically routed in the opposite way (where suricata doesn't see the SYN) but not this one, so I'm curious if this feature is related to adding support for both directions or if it's something different.

Actions
Copy link
 #6

Updated by Juliana Fajardini Reichow 11 months ago

  • Target version changed from 7.0.1 to 7.0.2
Actions
Copy link
 #7

Updated by Victor Julien 10 months ago

  • Description updated (diff)
Actions
Copy link
 #8

Updated by Jason Ish 10 months ago

  • Target version changed from 7.0.2 to 7.0.3
Actions
Copy link
 #9

Updated by Victor Julien 9 months ago

  • Target version changed from 7.0.3 to 7.0.4
Actions
Copy link
 #10

Updated by Victor Julien 5 months ago

  • Target version changed from 7.0.4 to 7.0.5
Actions
Copy link
 #11

Updated by Victor Julien 3 months ago

  • Target version changed from 7.0.5 to 7.0.6
Actions
Copy link
 #12

Updated by Victor Julien 2 months ago

  • Target version changed from 7.0.6 to 7.0.7
Actions
Copy link
 #13

Updated by Jamie Lavigne about 2 months ago

It's important for this feature to include flow logs (or similar) visibility so that users can use the source & dest IPs to track down asymmetric routes in their network when this policy is triggered. Without that visibility it will be a difficult experience to find and fix the routes.

Actions
Copy link
 #14

Updated by Victor Julien about 1 month ago

  • Assignee changed from Juliana Fajardini Reichow to OISF Dev
Actions
Copy link

Also available in: Atom PDF