ipsec: T3828: Use IKE dh-group when ESP dh-group is set to `enable`

5 files changed, 14 insertions, 7 deletions

diff --git a/data/templates/ipsec/swanctl/l2tp.tmpl b/data/templates/ipsec/swanctl/l2tp.tmpl
index 2df5c2a4d..4cd1b4af3 100644
--- a/data/templates/ipsec/swanctl/l2tp.tmpl
+++ b/data/templates/ipsec/swanctl/l2tp.tmpl
@@ -20,7 +20,7 @@
         children {
             l2tp_remote_access_esp {
                 mode = transport
-                esp_proposals = {{ l2tp_esp | get_esp_ike_cipher | join(',') if l2tp_esp else l2tp_esp_default }}
+                esp_proposals = {{ l2tp_esp | get_esp_ike_cipher(l2tp_ike) | join(',') if l2tp_esp else l2tp_esp_default }}
                 life_time = {{ l2tp_esp.lifetime if l2tp_esp else l2tp.lifetime }}s
                 local_ts = dynamic[/1701]
                 remote_ts = dynamic
diff --git a/data/templates/ipsec/swanctl/peer.tmpl b/data/templates/ipsec/swanctl/peer.tmpl
index 019f9e0d7..951a1b22c 100644
--- a/data/templates/ipsec/swanctl/peer.tmpl
+++ b/data/templates/ipsec/swanctl/peer.tmpl
@@ -56,7 +56,7 @@
 {%   if peer_conf.vti is defined and peer_conf.vti.bind is defined and peer_conf.tunnel is not defined %}
 {%     set vti_esp = esp_group[ peer_conf.vti.esp_group ] if peer_conf.vti.esp_group is defined else esp_group[ peer_conf.default_esp_group ] %}
             peer_{{ name }}_vti {
-                esp_proposals = {{ vti_esp | get_esp_ike_cipher | join(',') }}
+                esp_proposals = {{ vti_esp | get_esp_ike_cipher(ike) | join(',') }}
                 life_time = {{ vti_esp.lifetime }}s
                 local_ts = 0.0.0.0/0,::/0
                 remote_ts = 0.0.0.0/0,::/0
@@ -87,7 +87,7 @@
 {%       set remote_port = tunnel_conf.remote.port if tunnel_conf.remote is defined and tunnel_conf.remote.port is defined else '' %}
 {%       set remote_suffix = '[{0}/{1}]'.format(proto, remote_port) if proto or remote_port else '' %}
             peer_{{ name }}_tunnel_{{ tunnel_id }} {
-                esp_proposals = {{ tunnel_esp | get_esp_ike_cipher | join(',') }}
+                esp_proposals = {{ tunnel_esp | get_esp_ike_cipher(ike) | join(',') }}
                 life_time = {{ tunnel_esp.lifetime }}s
 {%       if tunnel_esp.mode is not defined or tunnel_esp.mode == 'tunnel' %}
 {%         if tunnel_conf.local is defined and tunnel_conf.local.prefix is defined %}
diff --git a/data/templates/ipsec/swanctl/profile.tmpl b/data/templates/ipsec/swanctl/profile.tmpl
index 66bcaa776..948dd8f87 100644
--- a/data/templates/ipsec/swanctl/profile.tmpl
+++ b/data/templates/ipsec/swanctl/profile.tmpl
@@ -19,7 +19,7 @@
 {%       endif %}
         children {
             dmvpn {
-                esp_proposals = {{ esp | get_esp_ike_cipher | join(',')  }}
+                esp_proposals = {{ esp | get_esp_ike_cipher(ike) | join(',')  }}
                 rekey_time = {{ esp.lifetime }}s
                 rand_time = 540s
                 local_ts = dynamic[gre]
diff --git a/data/templates/ipsec/swanctl/remote_access.tmpl b/data/templates/ipsec/swanctl/remote_access.tmpl
index 4fdc2a276..6354c60b1 100644
--- a/data/templates/ipsec/swanctl/remote_access.tmpl
+++ b/data/templates/ipsec/swanctl/remote_access.tmpl
@@ -35,7 +35,7 @@
         }
         children {
             ikev2-vpn  {
-                esp_proposals = {{ esp | get_esp_ike_cipher | join(',') }}
+                esp_proposals = {{ esp | get_esp_ike_cipher(ike) | join(',') }}
                 rekey_time = {{ esp.lifetime }}s
                 rand_time = 540s
                 dpd_action = clear
diff --git a/python/vyos/template.py b/python/vyos/template.py
index ee6e52e1d..d13915766 100644
--- a/python/vyos/template.py
+++ b/python/vyos/template.py
@@ -393,8 +393,15 @@ def get_ip(interface):
     from vyos.ifconfig import Interface
     return Interface(interface).get_addr()
 
+def get_first_ike_dh_group(ike_group):
+    if ike_group and 'proposal' in ike_group:
+        for priority, proposal in ike_group['proposal'].items():
+            if 'dh_group' in proposal:
+                return 'dh-group' + proposal['dh_group']
+    return 'dh-group2' # Fallback on dh-group2
+
 @register_filter('get_esp_ike_cipher')
-def get_esp_ike_cipher(group_config):
+def get_esp_ike_cipher(group_config, ike_group=None):
     pfs_lut = {
         'dh-group1'  : 'modp768',
         'dh-group2'  : 'modp1024',
@@ -433,7 +440,7 @@ def get_esp_ike_cipher(group_config):
             elif 'pfs' in group_config and group_config['pfs'] != 'disable':
                 group = group_config['pfs']
                 if group_config['pfs'] == 'enable':
-                    group = 'dh-group2'
+                    group = get_first_ike_dh_group(ike_group)
                 tmp += '-' + pfs_lut[group]
 
             ciphers.append(tmp)