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273c7665d3
<!--- Provide a general summary of your changes in the Title above --> ## Description Renames the vpn role to strongswan, and split up the variables to support 2 separate VPNs. Closes #1330 and closes #1162 Configures Ansible to use python3 on the server side. Closes #1024 Removes unneeded playbooks, reorganises a lot of variables Reorganises the `config` folder. Closes #1330 <details><summary>Here is how the config directory looks like now</summary> <p> ``` configs/X.X.X.X/ |-- ipsec | |-- apple | | |-- desktop.mobileconfig | | |-- laptop.mobileconfig | | `-- phone.mobileconfig | |-- manual | | |-- cacert.pem | | |-- desktop.p12 | | |-- desktop.ssh.pem | | |-- ipsec_desktop.conf | | |-- ipsec_desktop.secrets | | |-- ipsec_laptop.conf | | |-- ipsec_laptop.secrets | | |-- ipsec_phone.conf | | |-- ipsec_phone.secrets | | |-- laptop.p12 | | |-- laptop.ssh.pem | | |-- phone.p12 | | `-- phone.ssh.pem | `-- windows | |-- desktop.ps1 | |-- laptop.ps1 | `-- phone.ps1 |-- ssh-tunnel | |-- desktop.pem | |-- desktop.pub | |-- laptop.pem | |-- laptop.pub | |-- phone.pem | |-- phone.pub | `-- ssh_config `-- wireguard |-- desktop.conf |-- desktop.png |-- laptop.conf |-- laptop.png |-- phone.conf `-- phone.png ```  </p> </details> ## Motivation and Context This refactoring is focused to aim to the 1.0 release ## How Has This Been Tested? Deployed to several cloud providers with various options enabled and disabled ## Types of changes <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: --> - [x] Refactoring ## Checklist: <!--- Go over all the following points, and put an `x` in all the boxes that apply. --> <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> - [x] I have read the **CONTRIBUTING** document. - [x] My code follows the code style of this project. - [x] My change requires a change to the documentation. - [x] I have updated the documentation accordingly. - [x] All new and existing tests passed.
111 lines
4.5 KiB
Django/Jinja
111 lines
4.5 KiB
Django/Jinja
{% set subnets = ([strongswan_network_ipv6] if ipsec_enabled else []) + ([wireguard_network_ipv6] if wireguard_enabled else []) %}
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{% set ports = (['500', '4500'] if ipsec_enabled else []) + ([wireguard_port] if wireguard_enabled else []) %}
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#### The mangle table
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# This table allows us to modify packet headers
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# Packets enter this table first
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#
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*mangle
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:PREROUTING ACCEPT [0:0]
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:INPUT ACCEPT [0:0]
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:FORWARD ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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{% if reduce_mtu|int > 0 and ipsec_enabled %}
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-A FORWARD -s {{ strongswan_network_ipv6 }} -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss {{ 1340 - reduce_mtu|int }}
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{% endif %}
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COMMIT
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#### The nat table
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# This table enables Network Address Translation
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# (This is technically a type of packet mangling)
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#
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*nat
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:PREROUTING ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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# Allow traffic from the VPN network to the outside world, and replies
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-A POSTROUTING -s {{ subnets|join(',') }} -m policy --pol none --dir out -j MASQUERADE
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COMMIT
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#### The filter table
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# The default ipfilter table
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#
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*filter
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# By default, drop packets that are destined for this server
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:INPUT DROP [0:0]
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# By default, drop packets that request to be forwarded by this server
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:FORWARD DROP [0:0]
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# By default, accept any packets originating from this server
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:OUTPUT ACCEPT [0:0]
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# Create the ICMPV6-CHECK chain and its log chain
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# These chains are used later to prevent a type of bug that would
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# allow malicious traffic to reach over the server into the private network
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# An instance of such a bug on Cisco software is described here:
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# https://www.insinuator.net/2016/05/cve-2016-1409-ipv6-ndp-dos-vulnerability-in-cisco-software/
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# other software implementations might be at least as broken as the one in CISCO gear.
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:ICMPV6-CHECK - [0:0]
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:ICMPV6-CHECK-LOG - [0:0]
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# Accept packets destined for localhost
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-A INPUT -i lo -j ACCEPT
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# Accept any packet from an open TCP connection
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-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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# Accept packets using the encapsulation protocol
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-A INPUT -p esp -j ACCEPT
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-A INPUT -m ah -j ACCEPT
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# rate limit ICMP traffic per source
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-A INPUT -p icmpv6 --icmpv6-type echo-request -m hashlimit --hashlimit-upto 5/s --hashlimit-mode srcip --hashlimit-srcmask 32 --hashlimit-name icmp-echo-drop -j ACCEPT
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# Accept IPSEC/WireGuard traffic to ports {{ subnets|join(',') }}
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-A INPUT -p udp -m multiport --dports {{ ports|join(',') }} -j ACCEPT
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# Allow new traffic to port 22 (SSH)
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-A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
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# Accept properly formatted Neighbor Discovery Protocol packets
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-A INPUT -p icmpv6 --icmpv6-type router-advertisement -m hl --hl-eq 255 -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type neighbor-solicitation -m hl --hl-eq 255 -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type neighbor-advertisement -m hl --hl-eq 255 -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type redirect -m hl --hl-eq 255 -j ACCEPT
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# DHCP in AWS
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-A INPUT -m conntrack --ctstate NEW -m udp -p udp --dport 546 -d fe80::/64 -j ACCEPT
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# TODO:
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# The IP of the resolver should be bound to a DUMMY interface.
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# DUMMY interfaces are the proper way to install IPs without assigning them any
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# particular virtual (tun,tap,...) or physical (ethernet) interface.
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# Accept DNS traffic to the local DNS resolver
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-A INPUT -d fcaa::1 -p udp --dport 53 -j ACCEPT
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# Drop traffic between VPN clients
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-A FORWARD -s {{ subnets|join(',') }} -d {{ subnets|join(',') }} -j {{ "DROP" if BetweenClients_DROP else "ACCEPT" }}
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-A FORWARD -j ICMPV6-CHECK
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-A FORWARD -p tcp --dport 445 -j DROP
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-A FORWARD -p udp -m multiport --ports 137,138 -j DROP
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-A FORWARD -p tcp -m multiport --ports 137,139 -j DROP
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-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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{% if ipsec_enabled %}
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-A FORWARD -m conntrack --ctstate NEW -s {{ strongswan_network_ipv6 }} -m policy --pol ipsec --dir in -j ACCEPT
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{% endif %}
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{% if wireguard_enabled %}
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-A FORWARD -m conntrack --ctstate NEW -s {{ wireguard_network_ipv6 }} -m policy --pol none --dir in -j ACCEPT
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{% endif %}
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# Use the ICMPV6-CHECK chain, described above
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-A ICMPV6-CHECK -p icmpv6 -m hl ! --hl-eq 255 --icmpv6-type router-solicitation -j ICMPV6-CHECK-LOG
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-A ICMPV6-CHECK -p icmpv6 -m hl ! --hl-eq 255 --icmpv6-type router-advertisement -j ICMPV6-CHECK-LOG
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-A ICMPV6-CHECK -p icmpv6 -m hl ! --hl-eq 255 --icmpv6-type neighbor-solicitation -j ICMPV6-CHECK-LOG
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-A ICMPV6-CHECK -p icmpv6 -m hl ! --hl-eq 255 --icmpv6-type neighbor-advertisement -j ICMPV6-CHECK-LOG
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-A ICMPV6-CHECK-LOG -j LOG --log-prefix "ICMPV6-CHECK-LOG DROP "
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-A ICMPV6-CHECK-LOG -j DROP
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COMMIT
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