wgconfd === wgconfd is a configuration manager for [WireGuard](https://wireguard.com/). Overview --- `wgconfd INTERFACE CONFIG` starts a process that manages some peers of a WireGuard interface. It adds/overwrites peers it knows about and removes peers once they disappear from its view. It leaves any peers it has never seen intact. Peers are defined in sources. A source is a JSON file served over a protocol that `curl` understands. A "server" peer has a known IP address and talks to other servers directly. A "road warrior" peer communicates with everyone through its base server. Configuration --- The main configuration file is written in [toml](https://github.com/toml-lang/toml). ```toml refresh_sec = 1200 # default min_keepalive = 10 # default max_keepalive = 0 # default, means "never" [[source]] name = "remote1" url = "https://wg.example.org/peers.json" ipv4 = [ "172.16.0.0/12", "192.168.5.0/24" ] ipv6 = [ "2001:db8::/32" ] [[source]] name = "remote2" url = "https://wg.example.com/peers.json" ipv4 = [ "172.16.0.0/12", "192.168.6.0/24" ] ipv6 = [ "2001:db8:1234:/48" ] psk = "/path/to/psk/file" allow_road_warriors = false [[source]] name = "local-user1" url = "file:///etc/wireguard/example/user1.json" ipv4 = [ "172.16.5.54/32" ] [[source]] name = "local-user2" url = "file:///etc/wireguard/example/user2.json" ipv6 = [ "2001:db8::5/128" ] ``` All IP address ranges from the source URL not entirely contained within the ones configured are discarded - if a source claims `0.0.0.0/0` but the config only allows `10.0.0.0/8`, nothing is allowed. The preshared key is applied to all peers defined in a source. If a single peer is defined in multiple sources, both the endpoint and preshared key are taken from the first source that defines it. It is possible to override some options for a specific public key, and/or to restrict the source that can define that peer: ```toml [peer."yIOdSFrFQ1WPYS6IUWCsRjzw2Iqq0HMcyVVEXu5z+nM="] source = "remote2" endpoint = "[2001:db8::6]:10656" psk = "QJmzt2PpKx8g98qrOtsNR4tB1bik+fMSabNNXCC5OUU=" keepalive = 20 ``` ### Alternative configuration There is an alternative configuration mechanism intended for integration with other software: `wgconfd --cmdline INTERFACE ARGS...` The arguments are a sequence of global options and sources: - `min_keepalive SEC` - `max_keepalive SEC` - `refresh_sec SEC` - `source NAME URL [psk PATH] [ipv4 NET,NET,...] [ipv6 NET,NET,...] [required] [allow_road_warriors | deny_road_warriors]` - `peer PUBKEY [endpoint IP:PORT] [psk PATH] [keepalive SEC] [source NAME]` Source format --- The source describes a list of peers with their associated `endpoint` address (required), `keepalive` (optional, defaults to never), and `ipv4` and `ipv6` ranges (optional, defaults to nothing): ```json { "servers": [{ "public_key": "hw0U7vI2rhjG9mQ34CUKO6M4dIF9e8ofKj5N6cAPtwY=", "endpoint": "198.51.100.66:656", "ipv4": [ "10.1.2.0/24" ] }, { "public_key": "nlFVtJrOwR2sVJji6NQjXnv//GVUK5W9T7ftkSnYPA8=", "endpoint": "[2002:cb00:71af::4]:656", "ipv4": [ "10.1.3.0/24" ] }], } ``` ### Road warriors wgconfd also supports roaming peers called "road warriors": ```json { ... "road_warriors": [{ "public_key": "YJ0Ye/Z/f+kzMu5au8JL/OP+cMs0eRsJPSQ9FZIa7Sk=", "base": "hw0U7vI2rhjG9mQ34CUKO6M4dIF9e8ofKj5N6cAPtwY=", "ipv4": [ "10.2.5.44/32" ] }, ...] } ``` A road warrior does not typically run wgconfd. It is instead expected to only talk to its base server peer. On the base peer, a WireGuard peer is created for the road warrior. On all other peers the allowed IP address ranges of the road warrior are added to its base instead. A road warrior from one source can use a server from another source, but allowed IPs are always checked against the source that contains the road warrior definition. The `allow_road_warriors` option in `[[source]]` sections can be used to deny being the base of road warriors from certain sources. ### Configuration updates The root object can contain a field `"next"` with an `"update_at"` timestamp and another configuration: ```json { "servers": [{ "public_key": "hw0U7vI2rhjG9mQ34CUKO6M4dIF9e8ofKj5N6cAPtwY=", "endpoint": "198.51.100.66:656", "ipv4": [ "10.1.2.0/24" ] }, { "public_key": "nlFVtJrOwR2sVJji6NQjXnv//GVUK5W9T7ftkSnYPA8=", "endpoint": "[2002:cb00:71af::4]:656", "ipv4": [ "10.1.3.0/24" ] }], "road_warriors": [{ "public_key": "YJ0Ye/Z/f+kzMu5au8JL/OP+cMs0eRsJPSQ9FZIa7Sk=", "base": "hw0U7vI2rhjG9mQ34CUKO6M4dIF9e8ofKj5N6cAPtwY=", "ipv4": [ "10.2.5.44/32" ] }], "next": { "update_at": "2033-05-18T03:33:20Z", "servers": [{ "public_key": "hw0U7vI2rhjG9mQ34CUKO6M4dIF9e8ofKj5N6cAPtwY=", "endpoint": "198.51.100.66:656", "ipv4": [ "10.1.2.0/24" ] }, { "public_key": "nlFVtJrOwR2sVJji6NQjXnv//GVUK5W9T7ftkSnYPA8=", "endpoint": "[2002:cb00:71af::4]:656", "ipv4": [ "10.1.3.0/25" ] }, { "public_key": "JjSETJ9ACv0sTTEtBE2qp9q4vbeq1i5suwWaJCuncFo=", "endpoint": "[2001:db8:ddcc:bbaa::5]:565", "ipv4": [ "10.1.3.128/25" ] }], "road_warriors": [{ "public_key": "YJ0Ye/Z/f+kzMu5au8JL/OP+cMs0eRsJPSQ9FZIa7Sk=", "base": "nlFVtJrOwR2sVJji6NQjXnv//GVUK5W9T7ftkSnYPA8=", "ipv4": [ "10.2.5.44/32" ] }] } } ``` All instances of `wgconfd` using that source will switch to the new configuration at the specified time according to their system clocks. Note that the regular mechanism for updates still applies - to cancel an update, remove the `"next"` field early enough so that all machines refresh the source before `"update_at"`. Operating system support --- wgconfd should work on all operating systems that provide the `wg` and `curl` commands. ### systemd-based Linux distributions Sample unit files are provided in the `dist/systemd` directory: - `wgconfd@IFNAME.service` runs wgconfd on the network interface `IFNAME` using configuration in `/etc/wireguard/IFNAME.toml`. The service expects that the interface has already been created and the prviate key has been set. - `wgconfd-state@IFNAME.service` should be restarted every time the network interface loses its configuration, for example when wg-quick is restarted. A Fedora source package is available at [https://git.venev.name/hristo/fedora/rust-wgconfd/]. ### OpenWRT There is an OpenWRT netifd protocol script in `dist/netifd`. The global options are set in the interface section in `/etc/config/network`. Sources and peers are defined in `wgconfd_source_IFNAME`/`wgconfd_peer_IFNAME` sections in the same file: ```sh config interface 'wg0' option proto 'wgconfd' option listen_port '656' option private_key 'uAoL9qoAFbAPg46NxIQJ36Zc5gJaYDBleL2iGEa8SEA=' list ip6addr '2002:db8:1:1/48' list ipaddr '10.4.0.1/10' config wgconfd_source_wg0 option name 'source1' option url 'https://wg.example.org/peers.json' list ipv4 '10.5.0.0/16' list ip6addr '2002:db8:2:3/48' config wgconfd_source_wg0 option name 'source2' option url 'https://wg.example.com/peers.json' list ipv4 '10.6.0.0/16' config wgconfd_peer_wg0 option public_key 'dJyitquxsM3gf8a8yVDko6Se0sKrXi+glUTQN4mPZCo=' option source 'source2' option psk '/etc/wgconfd-psk/example.com-machine1' ```