1 files changed, 133 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces_wireguard.py b/src/conf_mode/interfaces_wireguard.py
new file mode 100755
index 000000000..79e5d3f44
--- /dev/null
+++ b/src/conf_mode/interfaces_wireguard.py
@@ -0,0 +1,133 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2023 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.configdict import get_interface_dict
+from vyos.configdict import is_node_changed
+from vyos.configverify import verify_vrf
+from vyos.configverify import verify_address
+from vyos.configverify import verify_bridge_delete
+from vyos.configverify import verify_mtu_ipv6
+from vyos.configverify import verify_mirror_redirect
+from vyos.configverify import verify_bond_bridge_member
+from vyos.ifconfig import WireGuardIf
+from vyos.utils.kernel import check_kmod
+from vyos.utils.network import check_port_availability
+from vyos.utils.network import is_wireguard_key_pair
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+
+def get_config(config=None):
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
+    interface name will be added or a deleted flag
+    """
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['interfaces', 'wireguard']
+    ifname, wireguard = get_interface_dict(conf, base)
+
+    # Check if a port was changed
+    tmp = is_node_changed(conf, base + [ifname, 'port'])
+    if tmp: wireguard['port_changed'] = {}
+
+    # T4702: If anything on a peer changes we remove the peer first and re-add it
+    if is_node_changed(conf, base + [ifname, 'peer']):
+        wireguard.update({'rebuild_required': {}})
+
+    return wireguard
+
+def verify(wireguard):
+    if 'deleted' in wireguard:
+        verify_bridge_delete(wireguard)
+        return None
+
+    verify_mtu_ipv6(wireguard)
+    verify_address(wireguard)
+    verify_vrf(wireguard)
+    verify_bond_bridge_member(wireguard)
+    verify_mirror_redirect(wireguard)
+
+    if 'private_key' not in wireguard:
+        raise ConfigError('Wireguard private-key not defined')
+
+    if 'peer' not in wireguard:
+        raise ConfigError('At least one Wireguard peer is required!')
+
+    if 'port' in wireguard and 'port_changed' in wireguard:
+        listen_port = int(wireguard['port'])
+        if check_port_availability('0.0.0.0', listen_port, 'udp') is not True:
+            raise ConfigError(f'UDP port {listen_port} is busy or unavailable and '
+                               'cannot be used for the interface!')
+
+    # run checks on individual configured WireGuard peer
+    public_keys = []
+    for tmp in wireguard['peer']:
+        peer = wireguard['peer'][tmp]
+
+        if 'allowed_ips' not in peer:
+            raise ConfigError(f'Wireguard allowed-ips required for peer "{tmp}"!')
+
+        if 'public_key' not in peer:
+            raise ConfigError(f'Wireguard public-key required for peer "{tmp}"!')
+
+        if ('address' in peer and 'port' not in peer) or ('port' in peer and 'address' not in peer):
+            raise ConfigError('Both Wireguard port and address must be defined '
+                              f'for peer "{tmp}" if either one of them is set!')
+
+        if peer['public_key'] in public_keys:
+            raise ConfigError(f'Duplicate public-key defined on peer "{tmp}"')
+
+        if 'disable' not in peer:
+            if is_wireguard_key_pair(wireguard['private_key'], peer['public_key']):
+                raise ConfigError(f'Peer "{tmp}" has the same public key as the interface "{wireguard["ifname"]}"')
+
+        public_keys.append(peer['public_key'])
+
+def apply(wireguard):
+    if 'rebuild_required' in wireguard or 'deleted' in wireguard:
+        wg = WireGuardIf(**wireguard)
+        # WireGuard only supports peer removal based on the configured public-key,
+        # by deleting the entire interface this is the shortcut instead of parsing
+        # out all peers and removing them one by one.
+        #
+        # Peer reconfiguration will always come with a short downtime while the
+        # WireGuard interface is recreated (see below)
+        wg.remove()
+
+    # Create the new interface if required
+    if 'deleted' not in wireguard:
+        wg = WireGuardIf(**wireguard)
+        wg.update(wireguard)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        check_kmod('wireguard')
+        c = get_config()
+        verify(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)