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# Building and installing letmein | ||
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## Prerequisites | ||
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The Rust compiler must be installed to build letmein. | ||
It is recommended to use the latest version of the stable Rust compiler: | ||
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[Rust installer](https://www.rust-lang.org/tools/install) | ||
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The Rust installer will install the compiler and the build tool `cargo`. | ||
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The build requires the additional `cargo-audit` and `cargo-auditable` tools to be installed. | ||
Run this command to install both tools: | ||
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```sh | ||
cargo install cargo-audit cargo-auditable | ||
``` | ||
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At runtime the nftables `nft` binary is required to be installed reachable in the `$PATH`. | ||
On Debian please install the `nftables` package: | ||
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```sh | ||
apt install nftables | ||
``` | ||
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## Building letmein | ||
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Run the `build.sh` script to build letmein. | ||
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After installing all build prerequisites, run the build script: | ||
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```sh | ||
./build.sh | ||
``` | ||
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## Installing letmein | ||
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### Install client | ||
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Then run the `install-client.sh` to install the letmein client to `/opt/letmein/`: | ||
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```sh | ||
./install-client.sh | ||
``` | ||
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The client is used to send a knock packet to the server. | ||
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### Install server | ||
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#### Prepare user and group for the server | ||
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The public network facing part of the letmein server runs with reduced privileges to reduce the attack surface. | ||
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For this to work, the user `letmeind` and the group `letmeind` have to be present in `/etc/passwd` and `/etc/group`. | ||
It is recommended for this user to not have a shell and home assigned and therefore not be a login-user. | ||
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You can use the following helper script to create the user and group in your system: | ||
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```sh | ||
./create-user.sh | ||
``` | ||
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#### Install the server and systemd units | ||
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After building and creating the `letmeind` system user, run the `install-server.sh` to install the letmeind server to `/opt/letmein/`: | ||
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```sh | ||
./install-server.sh | ||
``` | ||
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Installing the server will also install the service and socket into systemd and start the letmeind server. | ||
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The server is used to receive knock packets from the client. | ||
Upon successful knock authentication, the server will open the knocked port in its `nftables` firewall. | ||
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## Installing with `cargo install` from crates.io | ||
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Alternatively, you can install letmein, letmeind and letmeinfwd with `cargo install` from [crates.io](https://crates.io/). | ||
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Note that there are a few important differences when using `cargo install` instead of the `install*.sh` scripts from above: | ||
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- letmein will look for configuration files in `/etc` instead of `/opt/letmein/etc`. | ||
- The system user and group `letmeind` will not be installed in the operating system. The user and group are required for server operation. | ||
- The systemd sockets and services will not be installed in the operating system. | ||
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You may use `cargo install` to install the `letmein` client application. | ||
But it is *not* recommended to use `cargo install` to install the `letmeind` and `letmeinfwd` server daemons. | ||
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## Arch Linux: Installing from AUR | ||
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If you use [Arch Linux](https://archlinux.org/), then you can install the client and the server from [AUR](https://aur.archlinux.org/packages/letmein). | ||
The AUR package will install the configuration to `/etc` and the binaries to `/usr/bin`. | ||
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(The AUR package is maintained by a third party maintainer. Thanks!) |
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