T8598: Accel-PPP: Add upgrade-safe migration support for calling-sid peer IID secret enforcement across PPPoE, L2TP, PPTP, and SSTP (BP 2188)

(cherry picked from commit c9314daa78418751edaab9b4da8c2e33fb1a64ed)

1 files changed, 41 insertions, 0 deletions

diff --git a/src/migration-scripts/pptp/5-to-6 b/src/migration-scripts/pptp/5-to-6
new file mode 100644
index 000000000..88a857a5c
--- /dev/null
+++ b/src/migration-scripts/pptp/5-to-6
@@ -0,0 +1,41 @@
+# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+# Backfill IPv6 peer IID secret for legacy calling-sid configuration.
+
+from secrets import token_hex
+
+from vyos.configtree import ConfigTree
+
+base = ['vpn', 'pptp', 'remote-access']
+peer_id_path = base + ['ppp-options', 'ipv6-peer-interface-id']
+peer_id_secret_path = base + ['ppp-options', 'ipv6-peer-interface-id-secret']
+
+
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        return
+
+    if not config.exists(peer_id_path):
+        return
+
+    if config.return_value(peer_id_path) != 'calling-sid':
+        return
+
+    if config.exists(peer_id_secret_path):
+        return
+
+    config.set(peer_id_secret_path, value=token_hex(32))
+