ipsec: T4985: Changed 'reset vpn ipsec-peer' to use vici library

1. Changed reset IPSEC, IKE SAs to use vici library.
2. Created package vyos.ipsec to communicate with vici library.

1 files changed, 141 insertions, 0 deletions

diff --git a/python/vyos/ipsec.py b/python/vyos/ipsec.py
new file mode 100644
index 000000000..cb7c39ff6
--- /dev/null
+++ b/python/vyos/ipsec.py
@@ -0,0 +1,141 @@
+# Copyright 2020-2023 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/>.
+
+#Package to communicate with Strongswan VICI
+
+class ViciInitiateError(Exception):
+    """
+        VICI can't initiate a session.
+    """
+    pass
+class ViciCommandError(Exception):
+    """
+        VICI can't execute a command by any reason.
+    """
+    pass
+
+def get_vici_sas():
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError("IPsec not initialized")
+    sas = list(session.list_sas())
+    return sas
+
+
+def get_vici_connections():
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError("IPsec not initialized")
+    connections = list(session.list_conns())
+    return connections
+
+
+def get_vici_sas_by_name(ike_name: str, tunnel: str) -> list:
+    """
+    Find sas by IKE_SA name and/or CHILD_SA name
+    and return list of OrdinaryDicts with SASs info
+    If tunnel is not None return value is list of OrdenaryDicts contained only
+    CHILD_SAs wich names equal tunnel value.
+    :param ike_name: IKE SA name
+    :type ike_name: str
+    :param tunnel: CHILD SA name
+    :type tunnel: str
+    :return: list of Ordinary Dicts with SASs
+    :rtype: list
+    """
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError("IPsec not initialized")
+    vici_dict = {}
+    if ike_name:
+        vici_dict['ike'] = ike_name
+    if tunnel:
+        vici_dict['child'] = tunnel
+    try:
+        sas = list(session.list_sas(vici_dict))
+        return sas
+    except Exception:
+        raise ViciCommandError(f'Failed to get SAs')
+
+
+def terminate_vici_ikeid_list(ike_id_list: list) -> None:
+    """
+    Terminate IKE SAs by their id that contained in the list
+    :param ike_id_list: list of IKE SA id
+    :type ike_id_list: list
+    """
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError("IPsec not initialized")
+    try:
+        for ikeid in ike_id_list:
+            session_generator = session.terminate(
+                {'ike-id': ikeid, 'timeout': '-1'})
+            # a dummy `for` loop is required because of requirements
+            # from vici. Without a full iteration on the output, the
+            # command to vici may not be executed completely
+            for _ in session_generator:
+                pass
+    except Exception:
+        raise ViciCommandError(
+            f'Failed to terminate SA for IKE ids {ike_id_list}')
+
+
+def terminate_vici_by_name(ike_name: str, child_name: str) -> None:
+    """
+    Terminate IKE SAs by name if CHILD SA name is None.
+    Terminate CHILD SAs by name if CHILD SA name is specified
+    :param ike_name: IKE SA name
+    :type ike_name: str
+    :param child_name: CHILD SA name
+    :type child_name: str
+    """
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError("IPsec not initialized")
+    try:
+        vici_dict: dict= {}
+        if ike_name:
+            vici_dict['ike'] = ike_name
+        if child_name:
+            vici_dict['child'] = child_name
+        session_generator = session.terminate(vici_dict)
+        # a dummy `for` loop is required because of requirements
+        # from vici. Without a full iteration on the output, the
+        # command to vici may not be executed completely
+        for _ in session_generator:
+            pass
+    except Exception:
+        if child_name:
+            raise ViciCommandError(
+                f'Failed to terminate SA for IPSEC {child_name}')
+        else:
+            raise ViciCommandError(
+                f'Failed to terminate SA for IKE {ike_name}')