From 865cba395223afaa263ff7581fb53ee509f36266 Mon Sep 17 00:00:00 2001
From: Eshenko Dmitriy <dmitriy.eshenko@vyos.io>
Date: Wed, 19 Aug 2020 00:37:00 +0300
Subject: anyconnect: T2036: add anyconnect VPN support

---
 src/conf_mode/vpn_anyconnect.py | 132 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100755 src/conf_mode/vpn_anyconnect.py

(limited to 'src/conf_mode')

diff --git a/src/conf_mode/vpn_anyconnect.py b/src/conf_mode/vpn_anyconnect.py
new file mode 100755
index 000000000..45c06bffa
--- /dev/null
+++ b/src/conf_mode/vpn_anyconnect.py
@@ -0,0 +1,132 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2020 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.xml import defaults
+from vyos.template import render
+from vyos.util import call
+from vyos import ConfigError
+from crypt import crypt, mksalt, METHOD_SHA512
+
+from vyos import airbag
+airbag.enable()
+
+cfg_dir        = '/run/ocserv'
+ocserv_conf    = cfg_dir + '/ocserv.conf'
+ocserv_passwd  = cfg_dir + '/ocpasswd'
+radius_cfg     = cfg_dir + '/radiusclient.conf'
+radius_servers = cfg_dir + '/radius_servers'
+
+
+# Generate hash from user cleartext password
+def get_hash(password):
+    return crypt(password, mksalt(METHOD_SHA512))
+
+
+def get_config():
+    conf = Config()
+    base = ['vpn', 'anyconnect']
+    ocserv = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    default_values = defaults(base)
+    ocserv = dict_merge(default_values, ocserv)
+    return ocserv
+
+
+def verify(ocserv):
+    if ocserv is None:
+        return None
+
+    # Check authentication
+    if "authentication" in ocserv:
+        if "mode" in ocserv["authentication"]:
+            if "local" in ocserv["authentication"]["mode"]:
+                if not ocserv["authentication"]["local_users"] or not ocserv["authentication"]["local_users"]["username"]:
+                    raise ConfigError('Anyconect mode local required at leat one user')
+                else:
+                    for user in ocserv["authentication"]["local_users"]["username"]:
+                        if not "password" in ocserv["authentication"]["local_users"]["username"][user]:
+                            raise ConfigError(f'password required for user {user}')
+        else:
+            raise ConfigError('anyconnect authentication mode required')
+    else:
+        raise ConfigError('anyconnect authentication credentials required')
+
+    # Check ssl
+    if "ssl" in ocserv:
+        req_cert = ['ca_cert_file', 'cert_file', 'key_file']
+        for cert in req_cert:
+            if not cert in ocserv["ssl"]:
+                raise ConfigError('anyconnect ssl {0} required'.format(cert.replace('_', '-')))
+    else:
+        raise ConfigError('anyconnect ssl required')
+
+    # Check network settings
+    if "network_settings" in ocserv:
+        if "push_route" in ocserv["network_settings"]:
+            # Replace default route
+            if "0.0.0.0/0" in ocserv["network_settings"]["push_route"]:
+                ocserv["network_settings"]["push_route"].remove("0.0.0.0/0")
+                ocserv["network_settings"]["push_route"].append("default")
+        else:
+            ocserv["network_settings"]["push_route"] = "default"  
+    else:
+        raise ConfigError('anyconnect network settings required')
+
+
+def generate(ocserv):
+    if not ocserv:
+        return None
+
+    if "radius" in ocserv["authentication"]["mode"]:
+        # Render radius client configuration
+        render(radius_cfg, 'ocserv/radius_conf.tmpl', ocserv["authentication"]["radius"], trim_blocks=True)
+        # Render radius servers
+        render(radius_servers, 'ocserv/radius_servers.tmpl', ocserv["authentication"]["radius"], trim_blocks=True)
+    else:
+        if "local_users" in ocserv["authentication"]:
+            for user in ocserv["authentication"]["local_users"]["username"]:
+                ocserv["authentication"]["local_users"]["username"][user]["hash"] = get_hash(ocserv["authentication"]["local_users"]["username"][user]["password"])
+            # Render local users
+            render(ocserv_passwd, 'ocserv/ocserv_passwd.tmpl', ocserv["authentication"]["local_users"], trim_blocks=True)
+
+    # Render config
+    render(ocserv_conf, 'ocserv/ocserv_config.tmpl', ocserv, trim_blocks=True)
+    
+
+
+def apply(ocserv):
+    if not ocserv:
+        call('systemctl stop ocserv.service')
+        for file in [ocserv_conf, ocserv_passwd]:
+            if os.path.exists(file):
+                os.unlink(file)
+    else:
+        call('systemctl restart ocserv.service')
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)
-- 
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