pki: openconnect: T3642: Migrate OpenConnect SSL to PKI configuration

2 files changed, 194 insertions, 7 deletions

diff --git a/src/conf_mode/vpn_openconnect.py b/src/conf_mode/vpn_openconnect.py
index 2986c3458..f6db196dc 100755
--- a/src/conf_mode/vpn_openconnect.py
+++ b/src/conf_mode/vpn_openconnect.py
@@ -19,9 +19,11 @@ from sys import exit
 
 from vyos.config import Config
 from vyos.configdict import dict_merge
-from vyos.xml import defaults
+from vyos.pki import wrap_certificate
+from vyos.pki import wrap_private_key
 from vyos.template import render
 from vyos.util import call
+from vyos.xml import defaults
 from vyos import ConfigError
 from crypt import crypt, mksalt, METHOD_SHA512
 
@@ -50,6 +52,10 @@ def get_config():
     default_values = defaults(base)
     ocserv = dict_merge(default_values, ocserv)
 
+    if ocserv:
+        ocserv['pki'] = conf.get_config_dict(['pki'], key_mangling=('-', '_'),
+                                get_first_key=True, no_tag_node_value_mangle=True)
+
     return ocserv
 
 def verify(ocserv):
@@ -72,14 +78,36 @@ def verify(ocserv):
         raise ConfigError('openconnect authentication credentials required')
 
     # Check ssl
-    if "ssl" in ocserv:
-        req_cert = ['cert_file', 'key_file']
-        for cert in req_cert:
-            if not cert in ocserv["ssl"]:
-                raise ConfigError('openconnect ssl {0} required'.format(cert.replace('_', '-')))
-    else:
+    if 'ssl' not in ocserv:
         raise ConfigError('openconnect ssl required')
 
+    if not ocserv['pki'] or 'certificate' not in ocserv['pki']:
+        raise ConfigError('PKI not configured')
+
+    ssl = ocserv['ssl']
+    if 'certificate' not in ssl:
+        raise ConfigError('openconnect ssl certificate required')
+
+    cert_name = ssl['certificate']
+
+    if cert_name not in ocserv['pki']['certificate']:
+        raise ConfigError('Invalid openconnect ssl certificate')
+
+    cert = ocserv['pki']['certificate'][cert_name]
+
+    if 'certificate' not in cert:
+        raise ConfigError('Missing certificate in PKI')
+
+    if 'private' not in cert or 'key' not in cert['private']:
+        raise ConfigError('Missing private key in PKI')
+
+    if 'ca_certificate' in ssl:
+        if 'ca' not in ocserv['pki']:
+            raise ConfigError('PKI not configured')
+
+        if ssl['ca_certificate'] not in ocserv['pki']['ca']:
+            raise ConfigError('Invalid openconnect ssl CA certificate')
+
     # Check network settings
     if "network_settings" in ocserv:
         if "push_route" in ocserv["network_settings"]:
@@ -109,6 +137,29 @@ def generate(ocserv):
             # Render local users
             render(ocserv_passwd, 'ocserv/ocserv_passwd.tmpl', ocserv["authentication"]["local_users"])
 
+    if "ssl" in ocserv:
+        cert_file_path = os.path.join(cfg_dir, 'cert.pem')
+        cert_key_path = os.path.join(cfg_dir, 'cert.key')
+        ca_cert_file_path = os.path.join(cfg_dir, 'ca.pem')
+
+        if 'certificate' in ocserv['ssl']:
+            cert_name = ocserv['ssl']['certificate']
+            pki_cert = ocserv['pki']['certificate'][cert_name]
+
+            with open(cert_file_path, 'w') as f:
+                f.write(wrap_certificate(pki_cert['certificate']))
+
+            if 'private' in pki_cert and 'key' in pki_cert['private']:
+                with open(cert_key_path, 'w') as f:
+                    f.write(wrap_private_key(pki_cert['private']['key']))
+
+        if 'ca_certificate' in ocserv['ssl']:
+            ca_name = ocserv['ssl']['ca_certificate']
+            pki_ca_cert = ocserv['pki']['ca'][ca_name]
+
+            with open(ca_cert_file_path, 'w') as f:
+                f.write(wrap_certificate(pki_ca_cert['certificate']))
+
     # Render config
     render(ocserv_conf, 'ocserv/ocserv_config.tmpl', ocserv)
 
diff --git a/src/migration-scripts/openconnect/0-to-1 b/src/migration-scripts/openconnect/0-to-1
new file mode 100755
index 000000000..83cd09143
--- /dev/null
+++ b/src/migration-scripts/openconnect/0-to-1
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 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/>.
+
+# - Update SSL to use PKI configuration
+
+import os
+
+from sys import argv
+from sys import exit
+from vyos.configtree import ConfigTree
+from vyos.pki import load_certificate
+from vyos.pki import load_crl
+from vyos.pki import load_private_key
+from vyos.pki import encode_certificate
+from vyos.pki import encode_private_key
+from vyos.util import run
+
+if (len(argv) < 1):
+    print("Must specify file name!")
+    exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+config = ConfigTree(config_file)
+base = ['vpn', 'openconnect']
+pki_base = ['pki']
+
+if not config.exists(base):
+    exit(0)
+
+AUTH_DIR = '/config/auth'
+
+def wrapped_pem_to_config_value(pem):
+    return "".join(pem.strip().split("\n")[1:-1])
+
+if not config.exists(base + ['ssl']):
+    exit(0)
+
+x509_base = base + ['ssl']
+pki_name = 'openconnect'
+
+if not config.exists(pki_base + ['ca']):
+    config.set(pki_base + ['ca'])
+    config.set_tag(pki_base + ['ca'])
+
+if not config.exists(pki_base + ['certificate']):
+    config.set(pki_base + ['certificate'])
+    config.set_tag(pki_base + ['certificate'])
+
+if config.exists(x509_base + ['ca-cert-file']):
+    cert_file = config.return_value(x509_base + ['ca-cert-file'])
+    cert_path = os.path.join(AUTH_DIR, cert_file)
+    cert = None
+
+    if os.path.isfile(cert_path):
+        if not os.access(cert_path, os.R_OK):
+            run(f'sudo chmod 644 {cert_path}')
+
+        with open(cert_path, 'r') as f:
+            cert_data = f.read()
+            cert = load_certificate(cert_data, wrap_tags=False)
+
+    if cert:
+        cert_pem = encode_certificate(cert)
+        config.set(pki_base + ['ca', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+        config.set(x509_base + ['ca-certificate'], value=pki_name)
+    else:
+        print(f'Failed to migrate CA certificate on openconnect config')
+
+    config.delete(x509_base + ['ca-cert-file'])
+
+if config.exists(x509_base + ['cert-file']):
+    cert_file = config.return_value(x509_base + ['cert-file'])
+    cert_path = os.path.join(AUTH_DIR, cert_file)
+    cert = None
+
+    if os.path.isfile(cert_path):
+        if not os.access(cert_path, os.R_OK):
+            run(f'sudo chmod 644 {cert_path}')
+
+        with open(cert_path, 'r') as f:
+            cert_data = f.read()
+            cert = load_certificate(cert_data, wrap_tags=False)
+
+    if cert:
+        cert_pem = encode_certificate(cert)
+        config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+        config.set(x509_base + ['certificate'], value=pki_name)
+    else:
+        print(f'Failed to migrate certificate on openconnect config')
+
+    config.delete(x509_base + ['cert-file'])
+
+if config.exists(x509_base + ['key-file']):
+    key_file = config.return_value(x509_base + ['key-file'])
+    key_path = os.path.join(AUTH_DIR, key_file)
+    key = None
+
+    if os.path.isfile(key_path):
+        if not os.access(key_path, os.R_OK):
+            run(f'sudo chmod 644 {key_path}')
+
+        with open(key_path, 'r') as f:
+            key_data = f.read()
+            key = load_private_key(key_data, passphrase=None, wrap_tags=False)
+
+    if key:
+        key_pem = encode_private_key(key, passphrase=None)
+        config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
+    else:
+        print(f'Failed to migrate private key on openconnect config')
+        
+    config.delete(x509_base + ['key-file'])
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print("Failed to save the modified config: {}".format(e))
+    exit(1)