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update post: snikket-private-xmpp-chat-on-oracle-cloud-free-tier

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add firewall information
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John Bowdre 2022-01-14 17:01:33 -06:00
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content/posts/2021/snikket-private-xmpp-chat-on-oracle-cloud-free-tier/index.md
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@ -1,7 +1,7 @@
---
title: "Snikket Private XMPP Chat on Oracle Cloud Free Tier" # Title of the blog post.
date: 2021-12-23 # Date of post creation.
lastmod: 2021-12-24 # Date when last modified
lastmod: 2022-01-14 # Date when last modified
description: "Notes on installing a Snikket XMPP chat instance alongside a Matrix instance on an Oracle Cloud free tier server" # Description used for search engine.
featured: false # Sets if post is a featured post, making appear on the home page side bar.
draft: false # Sets whether to render this page. Draft of true will not be rendered.
@ -39,7 +39,7 @@ A few days ago I migrated my original Snikket instance from Google Cloud (GCP) t
[^3]: That said, Snikket is built on the [XMPP messaging standard](https://xmpp.org/) which means it can inter-operate with other XMPP-based chat networks, servers, and clients - though of course the best experience will be had between Snikket servers and clients.
### Infrastructure setup
You can refer to my notes from last time for details on how I [created the Ubuntu 20.04 VM](/federated-matrix-server-synapse-on-oracle-clouds-free-tier/#instance-creation) and [configured the firewall rules](/federated-matrix-server-synapse-on-oracle-clouds-free-tier/#firewall-configuration) both at the cloud infrastructure level as well as within the host. Snikket does need a few additional [firewall ports](https://github.com/snikket-im/snikket-server/blob/master/docs/advanced/firewall.md) beyond what was needed for my Matrix setup:
You can refer to my notes from last time for details on how I [created the Ubuntu 20.04 VM](/federated-matrix-server-synapse-on-oracle-clouds-free-tier/#instance-creation) and [configured the firewall rules](/federated-matrix-server-synapse-on-oracle-clouds-free-tier/#firewall-configuration) both at the cloud infrastructure level as well as within the host using `iptables`. Snikket does need a few additional [firewall ports](https://github.com/snikket-im/snikket-server/blob/master/docs/advanced/firewall.md) beyond what was needed for my Matrix setup:
| Port(s) | Transport | Purpose |
| --- | --- | --- |
@ -51,6 +51,51 @@ You can refer to my notes from last time for details on how I [created the Ubunt
| `5269` | TCP | Connections from other servers |
| `60000-60100`[^4] | UDP | Audio/Video data proxy (TURN data) |
As a gentle reminder, Oracle's `iptables` configuration inserts a `REJECT all` rule at the bottom of each chain. I needed to make sure that each of my `ALLOW` rules got inserted above that point. So I used `iptables -L INPUT --line-numbers` to identify which line held the `REJECT` rule, and then used `iptables -I INPUT [LINE_NUMBER] -m state --state NEW -p [PROTOCOL] --dport [PORT] -j ACCEPT` to insert the new rules above that point.
```bash
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dport 80 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dport 443 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dports 3478-3479 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp -m multiport --dports 3478-3479 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp -m multiport --dports 3478,3479 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dport 5000 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dport 5222 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p tcp --dport 5269 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p udp -m multiport --dports 3478,3479 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p udp -m multiport --dports 5349,5350 -j ACCEPT
sudo iptables -I INPUT 9 -m state --state NEW -p udp -m multiport --dports 60000:60100 -j ACCEPT
```
Then to verify the rules are in the right order:
```bash
$ sudo iptables -L INPUT --line-numbers -n
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ts-input all -- 0.0.0.0/0 0.0.0.0/0
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
5 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:123
6 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:443
8 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
9 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW multiport dports 5349,5350
10 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW multiport dports 60000:60100
11 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW multiport dports 3478,3479
12 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:5269
13 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:5222
14 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:5000
15 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW multiport dports 3478,3479
16 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
```
Before moving on, it's important to save them so the rules will persist across reboots!
```bash
$ sudo netfilter-persistent save
run-parts: executing /usr/share/netfilter-persistent/plugins.d/15-ip4tables save
run-parts: executing /usr/share/netfilter-persistent/plugins.d/25-ip6tables save
```
I also needed to create three DNS records[^5] with my domain registrar:
```
# Domain TTL Class Type Target