documentation/content/en/admin/prerequisites.md

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---
title: Preparing your machine
menu:
docs:
weight: 10
parent: admin
---
If you are setting up a fresh machine, it is recommended that you secure it first. Assuming that you are running **Ubuntu 20.04**:
Update content for 4.0 (part 1) (#991) * add rules * join date on profiles * deprecate follow scope * deprecate identity proofs * familiar followers * use definition lists instead of tables for defining activitypub properties * reformat notifications page into markdown * fix broken links to publicKey header * Application website is now nullable * update environment variables added and removed * fix typo * fix heading level * min_id and max_id can be used at the same time (3.3) * fix typo * new tootctl options * reformat tootctl page to use definition lists for params * add rules and configuration to Instance * fix typo * refactor instance api page * 3.3.0 duration on mutes * 3.3.0 mute_expires_at * improve section headings * 3.4.0 resend email confirmation api * 3.4.0 policy on push subscriptions * 3.4.0 add details to account registration error * refactor accounts api page and start adding relrefs to entity pages * 3.4.0 accounts/lookup api * add see also to accounts methods * add more see-also links * 3.5.0 appeal mod decisions * 3.5.0 reformat reports and add category/rule_ids params * document report entity and missing responses * fix typos * fix relrefs and url schema, add aliases to old urls * add archetypes for new methods/entities * update archetypes with see-also stubs * clearer presentation of rate limits * announcements api methods * refactor apps methods * refactor bookmarks methods + some anchors * refactor conversations methods * custom_emojis methods refactor * anchors * refactor directory methods * refactor domain_blocks methods * add see also to emails methods * fix page relref shortcodes to specific methods + refactor endorsements methods * min_id max_id * refactor favourites methods * refactor featured_tags methods * refactor filters methods, make path params consistent, i18n required shortcode * follow_requests methods * lists methods * markers methods * forgot to add entity links * media methods, also fix formatting of some json errors * mutes methods, add more see-also links * oembed methods * preferences methods * proofs methods * push methods * suggestions methods * 3.5.0 add new trend types, fix formatting * refactor streaming methods * refactor oauth methods * note that streaming api casts payload to string * refactor search methods * refactor polls methods * remove unnecessary link * reformat scheduled_statuses methods * reformat timelines methods * reformat statuses methods * 3.5.0 editing statuses * consistent use of array brackets in form data parameters * update dev setup guide, add vagrant and clean up text * add admin/accounts methods * 3.6 role entity * admin/accounts methods v2 * minor fix * stub admin/reports methods * document admin reports * add 403 example to methods archetype * cleanup entities for admin reports and add new attrs * 3.6.0 domain allows methods + normalize admin entity namespace * fix search-and-replace error * add aliases for admin entities * 3.6.0 canonical email blocks entity * 3.5.0 admin/retention api * 3.5.0 add admin::ip doc * 3.5.0 admin/reports * 3.6.0 admin/domain_allows * 3.5.0 admin/dimensions * 3.6.0 permissions and roles * minor formatting fix * add anchor link to headings * checkpoint * add update commands to dev env setup guide * change mentions of v3.6 to v4.0 * tootctl now uses custom roles * fix formatting * v2 instance api * update frontmatter, add better titles to pages * minor wording change * consistency * add more aliases * add placeholders and WIP notices * explain link pagination and stub out todos * switch baseURL to https * 422 on reports with rules but category!=violation * document bug fixes * fix typo * remove duplicate API method definition * s/tootsuite/mastodon for github links * remove unnecessary escaping * s/tootsuite/mastodon in Entity archetype * add missing nullable shortcode * clarify oauth scope when requesting a user token * api/v2/media now synchronous for images * DISALLOW_UNAUTHENTICATED_API_ACCESS * add undocumented env variables * add instance domain blocks and extended description api * add SMTP_ENABLE_STARTTLS * add description to SMTP_ENABLE_STARTTLS * take suggestions from open PRs * normalize links and flavour language * Fully document streaming API based on source code * Add mention of MIME types * bump to ruby 3.0.4 * clarify how to check on async media processing * validation of replies_policy * remove TODOs on admin account action * EmailDomainBlocks * IpBlocks * Admin::DomainBlock * remove TODOs * following hashtags * followed_tags * remove reference to unused parameter * add new oauth scopes for admin blocks and allows * fix command signature for i18n-tasks normalize * reformat code structure page * document fixes for following tags (assume 4.0.3) * Add warning about pre-4.0 hardcoded roles * add note about case sensitivity * remove use of 'simply' from docs * remove reference to silencing * add reference to IDN normalization for verified links * add lang parameter
2022-11-20 07:34:38 +01:00
## Do not allow password-based SSH login (keys only)
First make sure you are actually logging in to the server using keys and not via a password, otherwise this will lock you out. Many hosting providers support uploading a public key and automatically set up key-based root login on new machines for you.
Edit `/etc/ssh/sshd_config` and find `PasswordAuthentication`. Make sure its uncommented and set to `no`. If you made any changes, restart sshd:
```bash
systemctl restart ssh.service
```
## Update system packages
```bash
apt update && apt upgrade -y
```
## Install fail2ban so it blocks repeated login attempts
First, install fail2ban:
```bash
apt install fail2ban
```
Edit `/etc/fail2ban/jail.local` and put this inside:
```text
[DEFAULT]
destemail = your@email.here
sendername = Fail2Ban
[sshd]
enabled = true
port = 22
[sshd-ddos]
enabled = true
port = 22
```
Finally restart fail2ban:
```bash
systemctl restart fail2ban
```
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## Install a firewall and only allow SSH, HTTP and HTTPS ports
First, install iptables-persistent. During installation it will ask you if you want to keep current rulesdecline.
```bash
apt install -y iptables-persistent
```
Edit `/etc/iptables/rules.v4` and put this inside:
```text
*filter
# Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT
# Accept all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# Allow all outbound traffic - you can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT
# Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL).
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
# Allow SSH connections
# The -dport number should be the same port number you set in sshd_config
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT
# Allow ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
# Log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7
# Reject all other inbound - default deny unless explicitly allowed policy
-A INPUT -j REJECT
-A FORWARD -j REJECT
COMMIT
```
With iptables-persistent, that configuration will be loaded at boot time. But since we are not rebooting right now, we need to load it manually for the first time:
```bash
iptables-restore < /etc/iptables/rules.v4
```