From b2bf1592189fb9298f2a68272418a132a73f37bf Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Sat, 3 Jul 2021 15:52:26 +0200
Subject: ipsec: T1210: T1251: IKEv2 road-warrior support

set vpn ipsec esp-group ESP-RW compression 'disable'
set vpn ipsec esp-group ESP-RW lifetime '3600'
set vpn ipsec esp-group ESP-RW pfs 'disable'
set vpn ipsec esp-group ESP-RW proposal 10 encryption 'aes256'
set vpn ipsec esp-group ESP-RW proposal 10 hash 'sha256'
set vpn ipsec esp-group ESP-RW proposal 20 encryption 'aes256'
set vpn ipsec esp-group ESP-RW proposal 20 hash 'sha1'
set vpn ipsec ike-group IKE-RW key-exchange 'ikev2'
set vpn ipsec ike-group IKE-RW lifetime '10800'
set vpn ipsec ike-group IKE-RW mobike 'enable'
set vpn ipsec ike-group IKE-RW proposal 10 dh-group '2'
set vpn ipsec ike-group IKE-RW proposal 10 encryption 'aes256'
set vpn ipsec ike-group IKE-RW proposal 10 hash 'sha1'
set vpn ipsec ike-group IKE-RW proposal 20 dh-group '2'
set vpn ipsec ike-group IKE-RW proposal 20 encryption 'aes128'
set vpn ipsec ike-group IKE-RW proposal 20 hash 'sha1'
set vpn ipsec ipsec-interfaces interface 'dum0'
set vpn ipsec remote-access rw authentication id 'vyos'
set vpn ipsec remote-access rw authentication local-users username vyos password vyos
set vpn ipsec remote-access rw authentication x509 ca-certificate 'peer_172-18-254-202'
set vpn ipsec remote-access rw authentication x509 certificate 'peer_172-18-254-202'
set vpn ipsec remote-access rw description 'asdf'
set vpn ipsec remote-access rw esp-group 'ESP-RW'
set vpn ipsec remote-access rw ike-group 'IKE-RW'
---
 data/templates/ipsec/swanctl.conf.tmpl          | 18 +++++++++
 data/templates/ipsec/swanctl/remote_access.tmpl | 37 +++++++++++++++++
 interface-definitions/vpn_ipsec.xml.in          | 53 +++++++++++++++++++++++++
 src/conf_mode/vpn_ipsec.py                      | 42 ++++++++++----------
 4 files changed, 129 insertions(+), 21 deletions(-)
 create mode 100644 data/templates/ipsec/swanctl/remote_access.tmpl

diff --git a/data/templates/ipsec/swanctl.conf.tmpl b/data/templates/ipsec/swanctl.conf.tmpl
index cafe52e78..15c035688 100644
--- a/data/templates/ipsec/swanctl.conf.tmpl
+++ b/data/templates/ipsec/swanctl.conf.tmpl
@@ -1,6 +1,7 @@
 ### Autogenerated by vpn_ipsec.py ###
 {% import 'ipsec/swanctl/profile.tmpl' as profile_tmpl %}
 {% import 'ipsec/swanctl/peer.tmpl' as peer_tmpl %}
+{% import 'ipsec/swanctl/remote_access.tmpl' as remote_access_tmpl %}
 
 connections {
 {% if profile is defined %}
@@ -13,6 +14,11 @@ connections {
 {{     peer_tmpl.conn(peer, peer_conf, ike_group, esp_group) }}
 {%   endfor %}
 {%  endif %}
+{% if remote_access is defined and remote_access is not none %}
+{%   for rw, rw_conf in remote_access.items() if rw_conf.disable is not defined %}
+{{ remote_access_tmpl.conn(rw, rw_conf, ike_group, esp_group) }}
+{%   endfor %}
+{% endif %}
 }
 
 secrets {
@@ -60,5 +66,17 @@ secrets {
 {%      endif %}
 {%    endfor %}
 {%  endif %}
+{%  if remote_access is defined %}
+{%    for ra, ra_conf in remote_access.items() if remote_access is defined %}
+{%      if ra_conf.authentication is defined and ra_conf.authentication.local_users is defined and ra_conf.authentication.local_users.username is defined %}
+{%        for user, user_conf in ra_conf.authentication.local_users.username.items() if user_conf.disable is not defined %}
+    eap-{{ ra }}-{{ user }} {
+        secret = "{{ user_conf.password }}"
+        id-{{ ra }}-{{ user }} = "{{ user }}"
+    }
+{%        endfor %}
+{%      endif %}
+{%    endfor %}
+{%  endif %}
 }
 
diff --git a/data/templates/ipsec/swanctl/remote_access.tmpl b/data/templates/ipsec/swanctl/remote_access.tmpl
new file mode 100644
index 000000000..89f6e343e
--- /dev/null
+++ b/data/templates/ipsec/swanctl/remote_access.tmpl
@@ -0,0 +1,37 @@
+{% macro conn(name, rw_conf, ike_group, esp_group) %}
+{#   peer needs to reference the global IKE configuration for certain values #}
+{%   set ike = ike_group[rw_conf.ike_group] %}
+{%   set esp = esp_group[rw_conf.esp_group] %}
+    ra-{{ name }} {
+        remote_addrs = %any
+        local_addrs = %any
+        proposals = {{ ike_group[rw_conf.ike_group] | get_esp_ike_cipher | join(',') }}
+        version = {{ ike.key_exchange[4:] if ike is defined and ike.key_exchange is defined else "0" }}
+        send_certreq = no
+        rekey_time = {{ ike.lifetime }}s
+        keyingtries = 0
+        local {
+            auth = pubkey
+{%   if rw_conf.authentication is defined and rw_conf.authentication.id is defined and rw_conf.authentication.use_x509_id is not defined %}
+            id = "{{ rw_conf.authentication.id }}"
+{%   endif %}
+{%   if rw_conf.authentication is defined and rw_conf.authentication.x509 is defined and rw_conf.authentication.x509.certificate is defined %}
+            certs = {{ rw_conf.authentication.x509.certificate }}.pem
+{%   endif %}
+        }
+        remote {
+            auth = eap-mschapv2
+            id = %any
+            eap_id = %any
+        }
+        children {
+            ikev2-vpn  {
+                esp_proposals = {{ esp | get_esp_ike_cipher | join(',')  }}
+                rekey_time = {{ esp.lifetime }}s
+                rand_time = 540s
+                local_ts = 0.0.0.0/0
+                dpd_action = clear
+            }
+        }
+    }
+{% endmacro %}
diff --git a/interface-definitions/vpn_ipsec.xml.in b/interface-definitions/vpn_ipsec.xml.in
index ff60bb82f..ef3b05e29 100644
--- a/interface-definitions/vpn_ipsec.xml.in
+++ b/interface-definitions/vpn_ipsec.xml.in
@@ -705,6 +705,59 @@
               #include <include/ipsec/ike-group.xml.i>
             </children>
           </tagNode>
+          <tagNode name="remote-access">
+            <properties>
+              <help>Remote access IKEv2 VPN </help>
+            </properties>
+            <children>
+              <node name="authentication">
+                <properties>
+                  <help>Authentication for remote access</help>
+                </properties>
+                <children>
+                  #include <include/ipsec/authentication-id.xml.i>
+                  #include <include/ipsec/authentication-x509.xml.i>
+                  <node name="local-users">
+                    <properties>
+                      <help>Local user authentication for PPPoE server</help>
+                    </properties>
+                    <children>
+                      <tagNode name="username">
+                        <properties>
+                          <help>User name for authentication</help>
+                        </properties>
+                        <children>
+                          #include <include/generic-disable-node.xml.i>
+                          <leafNode name="password">
+                            <properties>
+                              <help>Password for authentication</help>
+                            </properties>
+                          </leafNode>
+                        </children>
+                      </tagNode>
+                    </children>
+                  </node>
+                </children>
+              </node>
+              #include <include/generic-description.xml.i>
+              #include <include/generic-disable-node.xml.i>
+              #include <include/ipsec/esp-group.xml.i>
+              #include <include/ipsec/ike-group.xml.i>
+              <leafNode name="timeout">
+                <properties>
+                  <help>Timeout to close connection if no data is transmitted</help>
+                  <valueHelp>
+                    <format>u32:10-86400</format>
+                    <description>Timeout in seconds (default 28800)</description>
+                  </valueHelp>
+                  <constraint>
+                    <validator name="numeric" argument="--range 10-86400"/>
+                  </constraint>
+                </properties>
+                <defaultValue>28800</defaultValue>
+              </leafNode>
+            </children>
+          </tagNode>
           <node name="site-to-site">
             <properties>
               <help>Site-to-site VPN</help>
diff --git a/src/conf_mode/vpn_ipsec.py b/src/conf_mode/vpn_ipsec.py
index d1b29ee9a..50223320d 100755
--- a/src/conf_mode/vpn_ipsec.py
+++ b/src/conf_mode/vpn_ipsec.py
@@ -34,7 +34,6 @@ from vyos.template import render
 from vyos.validate import is_ipv6_link_local
 from vyos.util import call
 from vyos.util import dict_search
-from vyos.util import process_named_running
 from vyos.util import run
 from vyos.xml import defaults
 from vyos import ConfigError
@@ -81,6 +80,7 @@ def get_config(config=None):
     # added in a more fine grained way later on
     del default_values['esp_group']
     del default_values['ike_group']
+    del default_values['remote_access']
     ipsec = dict_merge(default_values, ipsec)
 
     if 'esp_group' in ipsec:
@@ -88,12 +88,16 @@ def get_config(config=None):
         for group in ipsec['esp_group']:
             ipsec['esp_group'][group] = dict_merge(default_values,
                                                    ipsec['esp_group'][group])
-
     if 'ike_group' in ipsec:
         default_values = defaults(base + ['ike-group'])
         for group in ipsec['ike_group']:
             ipsec['ike_group'][group] = dict_merge(default_values,
                                                    ipsec['ike_group'][group])
+    if 'remote_access' in ipsec:
+        default_values = defaults(base + ['remote-access'])
+        for rw in ipsec['remote_access']:
+            ipsec['remote_access'][rw] = dict_merge(default_values,
+                                                    ipsec['remote_access'][rw])
 
     ipsec['dhcp_no_address'] = {}
     ipsec['interface_change'] = leaf_node_changed(conf, base + ['ipsec-interfaces',
@@ -109,8 +113,6 @@ def get_config(config=None):
                                              get_first_key=True,
                                              no_tag_node_value_mangle=True)
 
-    import pprint
-    pprint.pprint(ipsec)
     return ipsec
 
 def get_rsa_local_key(ipsec):
@@ -326,6 +328,11 @@ def generate(ipsec):
     if not os.path.exists(KEY_PATH):
         os.mkdir(KEY_PATH, mode=0o700)
 
+    if 'remote_access' in ipsec:
+        for rw, rw_conf in ipsec['remote_access'].items():
+            if 'authentication' in rw_conf and 'x509' in rw_conf['authentication']:
+                generate_pki_files(ipsec['pki'], rw_conf['authentication']['x509'])
+
     if 'site_to_site' in data and 'peer' in data['site_to_site']:
         for peer, peer_conf in ipsec['site_to_site']['peer'].items():
             if peer in ipsec['dhcp_no_address']:
@@ -385,24 +392,17 @@ def resync_nhrp(ipsec):
 
 def apply(ipsec):
     if not ipsec:
-        call('sudo /usr/sbin/ipsec stop')
+        call('sudo ipsec stop')
     else:
-        should_start = 'profile' in ipsec or dict_search('site_to_site.peer', ipsec)
-
-        if not process_named_running('charon') and should_start:
-            args = f'--auto-update {ipsec["auto_update"]}' if 'auto_update' in ipsec else ''
-            call(f'sudo /usr/sbin/ipsec start {args}')
-        elif not should_start:
-            call('sudo /usr/sbin/ipsec stop')
-        elif ipsec['interface_change']:
-            call('sudo /usr/sbin/ipsec restart')
-        else:
-            call('sudo /usr/sbin/ipsec rereadall')
-            call('sudo /usr/sbin/ipsec reload')
-
-        if should_start:
-            sleep(2) # Give charon enough time to start
-            call('sudo /usr/sbin/swanctl -q')
+        args = ''
+        if 'auto_update' in ipsec:
+            args = '--auto-update ' + ipsec['auto_update']
+        call(f'sudo ipsec restart {args}')
+        call('sudo ipsec rereadall')
+        call('sudo ipsec reload')
+
+        sleep(5) # Give charon enough time to start
+        call('sudo swanctl -q')
 
     resync_l2tp(ipsec)
     resync_nhrp(ipsec)
-- 
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