wireguard: T5413: Blocked adding the peer with the router's public key

Disabled adding the peer with the same public key as the router has.
Backport from current
https://github.com/vyos/vyos-1x/pull/2122

2 files changed, 65 insertions, 1 deletions

diff --git a/src/conf_mode/interfaces-wireguard.py b/src/conf_mode/interfaces-wireguard.py
index b28aa9568..5748bf483 100755
--- a/src/conf_mode/interfaces-wireguard.py
+++ b/src/conf_mode/interfaces-wireguard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2018-2020 VyOS maintainers and contributors
+# 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
@@ -28,6 +28,7 @@ from vyos.configverify import verify_bridge_delete
 from vyos.configverify import verify_mtu_ipv6
 from vyos.configverify import verify_bond_bridge_member
 from vyos.ifconfig import WireGuardIf
+from vyos.validate import is_wireguard_key_pair
 from vyos.util import check_kmod
 from vyos import ConfigError
 from vyos import airbag
@@ -94,6 +95,11 @@ def verify(wireguard):
             raise ConfigError('Both Wireguard port and address must be defined '
                               f'for peer "{tmp}" if either one of them is set!')
 
+        if 'disable' not in peer:
+            with open(wireguard['private_key'], 'r') as file:
+                private_key = file.read().rstrip()
+                if is_wireguard_key_pair(private_key, peer['pubkey']):
+                    raise ConfigError(f'Peer "{tmp}" has the same public key as the interface "{wireguard["ifname"]}"')
 def apply(wireguard):
     tmp = WireGuardIf(wireguard['ifname'])
     if 'deleted' in wireguard:
diff --git a/src/migration-scripts/interfaces/22-to-23 b/src/migration-scripts/interfaces/22-to-23
new file mode 100755
index 000000000..c3c4ea366
--- /dev/null
+++ b/src/migration-scripts/interfaces/22-to-23
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 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/>.
+
+import sys
+from vyos.configtree import ConfigTree
+from vyos.validate import is_wireguard_key_pair
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print("Must specify file name!")
+        sys.exit(1)
+
+    file_name = sys.argv[1]
+
+    with open(file_name, 'r') as f:
+        config_file = f.read()
+
+    config = ConfigTree(config_file)
+    base = ['interfaces', 'wireguard']
+    if not config.exists(base):
+        # Nothing to do
+        sys.exit(0)
+    for interface in config.list_nodes(base):
+        private_key_name = config.return_value(
+            base + [interface, 'private-key'])
+        private_key_path = f'/config/auth/wireguard/{private_key_name}/private.key'
+        with open(private_key_path, 'r') as file:
+            private_key = file.read().rstrip()
+        interface_base = base + [interface]
+        if config.exists(interface_base + ['peer']):
+            for peer in config.list_nodes(interface_base + ['peer']):
+                peer_base = interface_base + ['peer', peer]
+                peer_public_key = config.return_value(peer_base + ['pubkey'])
+                if config.exists(peer_base + ['pubkey']):
+                    if not config.exists(peer_base + ['disable']) \
+                            and is_wireguard_key_pair(private_key,
+                                                      peer_public_key):
+                        config.set(peer_base + ['disable'])
+
+    try:
+        with open(file_name, 'w') as f:
+            f.write(config.to_string())
+    except OSError as e:
+        print("Failed to save the modified config: {}".format(e))
+        sys.exit(1)