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Updated README. Add iptables basic rules

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This commit is contained in:
Claudio Maradonna 2021-04-11 19:02:40 +02:00
parent 6af902b827
commit 78b109cbfc
Signed by: claudiomaradonna
GPG key ID: B1EDCB4C3B05C387
5 changed files with 73 additions and 1 deletions
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README.md
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@ -23,7 +23,7 @@ edit the .gitattributes file accordingly:
```txt
neovim/*.conf gitlab-language=vim
spacemacs/*.conf gitlab-language=elisp
emacs/*.conf gitlab-language=elisp
```
## Support

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iptables/iptables-http-full-f2b.fw Normal file
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*filter
:INPUT DROP [4414218:211789180]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [17973:1146056]
:f2b-sshd - [0:0]
-A INPUT -p tcp -m multiport --dports 22 -j f2b-sshd
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 587 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 80 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 443 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -p tcp -m tcp --sport 587 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A f2b-sshd -j RETURN
COMMIT

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iptables/iptables-http-full.fw Normal file
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*filter
:INPUT DROP [4414218:211789180]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [17973:1146056]
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 587 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 80 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 443 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -p tcp -m tcp --sport 587 -m conntrack --ctstate ESTABLISHED -j ACCEPT
COMMIT

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iptables/iptables-ssh-only.fw Normal file
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*filter
:INPUT DROP [4414218:211789180]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [17973:1146056]
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable
COMMIT

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iptables/iptables.md Normal file
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# Configurations
All configurations includes:
* INPUT DROP
* SSH port on 22.
* SMTP port 25 as `--reject-with icmp-port-unreachable`
- [ssh-only](iptables-ssh-only.fw) -> SSH
- [http-full](iptables-http-full.fw) -> HTTP/ HTTPS/ SMTPS
- [http-full-f2b](iptables-http-full-f2b.fw) -> HTTP/ HTTPS/ SMTPS/ fail2ban
## Usage
Simply:
```bash
iptables-restore < file.fw
```