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deefabd8f8
Refs #3636 (This pays down some of the technical debt from Linux DNS) Refs #4473 (This partially fulfills it) Refs #5068 (This is needed to make `FIREZONE_DNS_CONTROL` mandatory) As of dd6421: - On both Linux and Windows, DNS control and IP setting (i.e. `on_set_interface_config`) both move to the Client - On Windows, route setting stays in `tun_windows.rs`. Route setting in Windows requires us to know the interface index, which we don't know in the Client code. If we could pass opaque platform-specific data between the tunnel and the Client it would be easy. - On Linux, route setting moves to the Client and Gateway, which completely removes the `worker` task in `tun_linux.rs` - Notifying systemd that we're ready moves up to the headless Client / IPC service ```[tasklist] ### Before merging / notes - [x] Does DNS roaming work on Linux on `main`? I don't see where it hooks up. I think I only set up DNS in `Tun::new` (Yes, the `Tun` gets recreated every time we reconfigure the device) - [x] Fix Windows Clients - [x] Fix Gateway - [x] Make sure connlib doesn't get the DNS control method from the env var (will be fixed in #5068) - [x] De-dupe consts - [ ] ~~Add DNS control test~~ (failed) - [ ] Smoke test Linux - [ ] Smoke test Windows ```
headless-client
This crate acts as the CLI / headless Client, and the privileged tunnel service for the GUI Client, for both Linux and Windows.
It is built as:
headless-clientto act as the Linux / Windows headless Clientfirezone-headless-clientto act as the Linux tunnel service, Windows headless Client, or Windows tunnel service
In general, the brand name should be part of the file name, but the OS name should not be.
Running
To run the headless Client:
- Generate a new Service account token from the "Actors -> Service Accounts" section of the admin portal and save it in your secrets manager. The Firezone Linux client requires a service account at this time.
- Ensure
/etc/dev.firezone.client/tokenis only readable by root (i.e.chmod 400) - Ensure
/etc/dev.firezone.client/tokencontains the Service account token. The Client needs this before it can start - Set
FIREZONE_IDto a unique string to identify this client in the portal, e.g.export FIREZONE_ID=$(uuidgen). The client requires this variable at startup. - Set
LOG_DIRto a suitable directory for writing logsexport LOG_DIR=/tmp/firezone-logs mkdir $LOG_DIR - Now, you can start the client with:
./firezone-headless-client standalone
If you're running as an unprivileged user, you'll need the CAP_NET_ADMIN
capability to open /dev/net/tun. You can add this to the client binary with:
sudo setcap 'cap_net_admin+eip' /path/to/firezone-headless-client
Building
Assuming you have Rust installed, you can build the headless Client with:
cargo build --release -p firezone-headless-client
The binary will be in target/release/firezone-headless-client
The release on Github are built with musl. To build this way, use:
rustup target add x86_64-unknown-linux-musl
sudo apt-get install musl-tools
cargo build --release -p headless-client --target x86_64-unknown-linux-musl
Files
/etc/dev.firezone.client/token- The service account token, provided by the human administrator. Must be owned by root and have 600 permissions (r/w by owner, nobody else can read) If present, the tunnel will ignore any GUI Client and run as a headless Client. If absent, the tunnel will wait for commands from a GUI Client/usr/bin/firezone-headless-client- The tunnel binary. This must run as root so it can modify the system's DNS settings. If DNS is not needed, it only needs CAP_NET_ADMIN./usr/lib/systemd/system/firezone-headless-client.service- A systemd service unit, installed by the deb package./var/lib/dev.firezone.client/config/firezone-id- The device ID, unique across an organization. The tunnel will generate this if it's not present.