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# Ansible Roles
## Required roles
* **Common**
* Installs several required packages and software updates, then reboots if necessary
* Configures network interfaces, and enables packet forwarding on them
* Configures IPtables to block traffic that might pose a risk to VPN users, such as [SMB/CIFS](https://medium.com/@ValdikSS/deanonymizing-windows-users-and-capturing-microsoft-and-vpn-accounts-f7e53fe73834)
* Enables [unattended-upgrades](https://help.ubuntu.com/community/AutomaticSecurityUpdates) to ensure available patches are always applied
* Modify features like core dumps, kernel parameters, and SUID binaries to limit possible attacks
* Enhances SSH with modern ciphers and seccomp, and restricts access to old or unwanted features like X11 forwarding and SFTP
* **Strongswan**
* Installs [strongSwan](https://www.strongswan.org/), enables AppArmor, limits CPU and memory access, and drops user privileges
* Builds a Certificate Authority (CA) with [easy-rsa-ipsec](https://github.com/ValdikSS/easy-rsa-ipsec) and creates one client certificate per user
* Bundles the appropriate certificates into Apple mobileconfig profiles and Powershell scripts for each user
* **Wireguard**
* Installs a [Wireguard](https://www.wireguard.com/) server, with a script to have it start at the time of server startup, and automatic checks for upgrades
* Creates wireguard.conf files for Linux clients as well as QR codes for Apple/Android clients
Note that you have the option to deploy an Algo server without either Wireguard or Strongswan by editing the `ipsec_enabled` line and/or `wireguard_enabled` line in the `config.cfg` file.
## Optional roles
* **DNS-based Adblocking**
* Installs the [dnsmasq](http://www.thekelleys.org.uk/dnsmasq/doc.html) local resolver with a blacklist for advertising domains
* Constrains dnsmasq with AppArmor and cgroups CPU and memory limitations
* **DNS encryption**
* Installs [dnscrypt-proxy](https://github.com/jedisct1/dnscrypt-proxy)
* Constrains dnscrypt-proxy with AppArmor and cgroups CPU and memory limitations
* **SSH Tunneling**
* Adds a restricted `algo` group with no shell access and limited SSH forwarding options
* Creates one limited, local account per user and an SSH public key for each