ipsec: T6148: Fixed reset command by adding init after terminating (#3763) (#3909)

Strongswan does not initiate session after termination via vici.
Added an CHILD SAs initialization on the initiator side
of the tunnel.

(cherry picked from commit 8838b29180ccc26d2aca0c22c9c8ca5e274825b2)

Co-authored-by: aapostoliuk <108394744+aapostoliuk@users.noreply.github.com>

1 files changed, 100 insertions, 36 deletions

diff --git a/python/vyos/ipsec.py b/python/vyos/ipsec.py
index 4603aab22..28f77565a 100644
--- a/python/vyos/ipsec.py
+++ b/python/vyos/ipsec.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2023 VyOS maintainers and contributors <maintainers@vyos.io>
+# Copyright 2020-2024 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
@@ -13,31 +13,38 @@
 # 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
+# Package to communicate with Strongswan VICI
+
 
 class ViciInitiateError(Exception):
     """
-        VICI can't initiate a session.
+    VICI can't initiate a session.
     """
+
     pass
+
+
 class ViciCommandError(Exception):
     """
-        VICI can't execute a command by any reason.
+    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")
+        raise ViciInitiateError('IPsec not initialized')
     try:
         sas = list(session.list_sas())
         return sas
     except Exception:
-        raise ViciCommandError(f'Failed to get SAs')
+        raise ViciCommandError('Failed to get SAs')
+
 
 def get_vici_connections():
     from vici import Session as vici_session
@@ -45,18 +52,19 @@ def get_vici_connections():
     try:
         session = vici_session()
     except Exception:
-        raise ViciInitiateError("IPsec not initialized")
+        raise ViciInitiateError('IPsec not initialized')
     try:
         connections = list(session.list_conns())
         return connections
     except Exception:
-        raise ViciCommandError(f'Failed to get connections')
+        raise ViciCommandError('Failed to get 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
+    Find installed SAs by IKE_SA name and/or CHILD_SA name
+    and return list with SASs info.
+    If tunnel is not None return a list contained only
     CHILD_SAs wich names equal tunnel value.
     :param ike_name: IKE SA name
     :type ike_name: str
@@ -70,7 +78,7 @@ def get_vici_sas_by_name(ike_name: str, tunnel: str) -> list:
     try:
         session = vici_session()
     except Exception:
-        raise ViciInitiateError("IPsec not initialized")
+        raise ViciInitiateError('IPsec not initialized')
     vici_dict = {}
     if ike_name:
         vici_dict['ike'] = ike_name
@@ -80,7 +88,31 @@ def get_vici_sas_by_name(ike_name: str, tunnel: str) -> list:
         sas = list(session.list_sas(vici_dict))
         return sas
     except Exception:
-        raise ViciCommandError(f'Failed to get SAs')
+        raise ViciCommandError('Failed to get SAs')
+
+
+def get_vici_connection_by_name(ike_name: str) -> list:
+    """
+    Find loaded SAs by IKE_SA name and return list with SASs info
+    :param ike_name: IKE SA name
+    :type ike_name: 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 is not initialized')
+    vici_dict = {}
+    if ike_name:
+        vici_dict['ike'] = ike_name
+    try:
+        sas = list(session.list_conns(vici_dict))
+        return sas
+    except Exception:
+        raise ViciCommandError('Failed to get SAs')
 
 
 def terminate_vici_ikeid_list(ike_id_list: list) -> None:
@@ -94,19 +126,17 @@ def terminate_vici_ikeid_list(ike_id_list: list) -> None:
     try:
         session = vici_session()
     except Exception:
-        raise ViciInitiateError("IPsec not initialized")
+        raise ViciInitiateError('IPsec is not initialized')
     try:
         for ikeid in ike_id_list:
-            session_generator = session.terminate(
-                {'ike-id': ikeid, 'timeout': '-1'})
+            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}')
+        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:
@@ -123,9 +153,9 @@ def terminate_vici_by_name(ike_name: str, child_name: str) -> None:
     try:
         session = vici_session()
     except Exception:
-        raise ViciInitiateError("IPsec not initialized")
+        raise ViciInitiateError('IPsec is not initialized')
     try:
-        vici_dict: dict= {}
+        vici_dict: dict = {}
         if ike_name:
             vici_dict['ike'] = ike_name
         if child_name:
@@ -138,16 +168,48 @@ def terminate_vici_by_name(ike_name: str, child_name: str) -> None:
             pass
     except Exception:
         if child_name:
-            raise ViciCommandError(
-                f'Failed to terminate SA for IPSEC {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}')
+            raise ViciCommandError(f'Failed to terminate SA for IKE {ike_name}')
+
+
+def vici_initiate_all_child_sa_by_ike(ike_sa_name: str, child_sa_list: list) -> bool:
+    """
+    Initiate IKE SA with scpecified CHILD_SAs in list
+
+    Args:
+        ike_sa_name (str): an IKE SA connection name
+        child_sa_list (list): a list of child SA names
+
+    Returns:
+        bool: a result of initiation command
+    """
+    from vici import Session as vici_session
+
+    try:
+        session = vici_session()
+    except Exception:
+        raise ViciInitiateError('IPsec is not initialized')
+
+    try:
+        for child_sa_name in child_sa_list:
+            session_generator = session.initiate(
+                {'ike': ike_sa_name, 'child': child_sa_name, '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
+        return True
+    except Exception:
+        raise ViciCommandError(f'Failed to initiate SA for IKE {ike_sa_name}')
 
 
-def vici_initiate(ike_sa_name: str, child_sa_name: str, src_addr: str,
-                  dst_addr: str) -> bool:
-    """Initiate IKE SA connection with specific peer
+def vici_initiate(
+    ike_sa_name: str, child_sa_name: str, src_addr: str, dst_addr: str
+) -> bool:
+    """Initiate IKE SA with one child_sa connection with specific peer
 
     Args:
         ike_sa_name (str): an IKE SA connection name
@@ -163,16 +225,18 @@ def vici_initiate(ike_sa_name: str, child_sa_name: str, src_addr: str,
     try:
         session = vici_session()
     except Exception:
-        raise ViciInitiateError("IPsec not initialized")
+        raise ViciInitiateError('IPsec is not initialized')
 
     try:
-        session_generator = session.initiate({
-            'ike': ike_sa_name,
-            'child': child_sa_name,
-            'timeout': '-1',
-            'my-host': src_addr,
-            'other-host': dst_addr
-        })
+        session_generator = session.initiate(
+            {
+                'ike': ike_sa_name,
+                'child': child_sa_name,
+                'timeout': '-1',
+                'my-host': src_addr,
+                'other-host': dst_addr,
+            }
+        )
         # 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
@@ -180,4 +244,4 @@ def vici_initiate(ike_sa_name: str, child_sa_name: str, src_addr: str,
             pass
         return True
     except Exception:
-        raise ViciCommandError(f'Failed to initiate SA for IKE {ike_sa_name}')
\ No newline at end of file
+        raise ViciCommandError(f'Failed to initiate SA for IKE {ike_sa_name}')