[service https] T1443: add self-signed TLS certificate

4 files changed, 183 insertions, 0 deletions

diff --git a/interface-definitions/https.xml b/interface-definitions/https.xml
index 828de449c..13d5c43ea 100644
--- a/interface-definitions/https.xml
+++ b/interface-definitions/https.xml
@@ -27,6 +27,30 @@
               </constraint>
             </properties>
           </leafNode>
+          <node name="certificates">
+            <properties>
+              <help>TLS certificates</help>
+            </properties>
+            <children>
+              <node name="system-generated-certificate" owner="${vyos_conf_scripts_dir}/vyos_cert.py">
+                <properties>
+                  <help>Use an automatically generated self-signed certificate</help>
+                  <valueless/>
+                </properties>
+                <children>
+                  <leafNode name="lifetime">
+                    <properties>
+                      <help>Lifetime in days; default is 365</help>
+                      <valueHelp>
+                        <format>1-65535</format>
+                        <description>Number of days</description>
+                      </valueHelp>
+                    </properties>
+                  </leafNode>
+                </children>
+              </node>
+            </children>
+          </node>
           <node name="api" owner="${vyos_conf_scripts_dir}/http-api.py">
             <properties>
               <help>VyOS HTTP API configuration</help>
diff --git a/python/vyos/defaults.py b/python/vyos/defaults.py
index ee307cf15..3e4c02562 100644
--- a/python/vyos/defaults.py
+++ b/python/vyos/defaults.py
@@ -39,3 +39,10 @@ api_data = {
     'debug' : 'false',
     'api_keys' : [ {"id": "testapp", "key": "qwerty"} ]
 }
+
+vyos_cert_data = {
+    "conf": "/etc/nginx/snippets/vyos-cert.conf",
+    "crt": "/etc/ssl/certs/vyos-selfsigned.crt",
+    "key": "/etc/ssl/private/vyos-selfsign",
+    "lifetime": "365",
+}
diff --git a/src/conf_mode/https.py b/src/conf_mode/https.py
index 2495cf7e7..289eacf69 100755
--- a/src/conf_mode/https.py
+++ b/src/conf_mode/https.py
@@ -46,11 +46,16 @@ server {
         #
         listen 443 ssl default_server;
         listen [::]:443 ssl default_server;
+
+{% if vyos_cert %}
+        include {{ vyos_cert.conf }};
+{% else %}
         #
         # Self signed certs generated by the ssl-cert package
         # Don't use them in a production server!
         #
         include snippets/snakeoil.conf;
+{% endif %}
 
 {% for l_addr in listen_address %}
         server_name {{ l_addr }};
@@ -88,6 +93,10 @@ def get_config():
         addrs = conf.return_values('listen-address')
         https['listen_address'] = addrs[:]
 
+    if conf.exists('certificates'):
+        if conf.exists('certificates system-generated-certificate'):
+            https['vyos_cert'] = vyos.defaults.vyos_cert_data
+
     if conf.exists('api'):
         https['api'] = vyos.defaults.api_data
 
diff --git a/src/conf_mode/vyos_cert.py b/src/conf_mode/vyos_cert.py
new file mode 100755
index 000000000..4a44573ca
--- /dev/null
+++ b/src/conf_mode/vyos_cert.py
@@ -0,0 +1,143 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 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 sys
+import os
+import subprocess
+import tempfile
+import pathlib
+import ssl
+
+import vyos.defaults
+from vyos.config import Config
+from vyos import ConfigError
+
+vyos_conf_scripts_dir = vyos.defaults.directories['conf_mode']
+
+# XXX: this model will need to be extended for tag nodes
+dependencies = [
+    'https.py',
+]
+
+def status_self_signed(cert_data):
+# check existence and expiration date
+    path = pathlib.Path(cert_data['conf'])
+    if not path.is_file():
+        return False
+    path = pathlib.Path(cert_data['crt'])
+    if not path.is_file():
+        return False
+    path = pathlib.Path(cert_data['key'])
+    if not path.is_file():
+        return False
+
+    # check if certificate is 1/2 past lifetime, with openssl -checkend
+    end_days = int(cert_data['lifetime'])
+    end_seconds = int(0.5*60*60*24*end_days)
+    checkend_cmd = ('openssl x509 -checkend {end} -noout -in {crt}'
+                    ''.format(end=end_seconds, **cert_data))
+    try:
+        subprocess.check_call(checkend_cmd, shell=True)
+        return True
+    except subprocess.CalledProcessError as err:
+        if err.returncode == 1:
+            return False
+        else:
+            print("Called process error: {}.".format(err))
+
+def generate_self_signed(cert_data):
+    san_config = None
+
+    if ssl.OPENSSL_VERSION_INFO < (1, 1, 1, 0, 0):
+        san_config = tempfile.NamedTemporaryFile()
+        with open(san_config.name, 'w') as fd:
+            fd.write('[req]\n')
+            fd.write('distinguished_name=req\n')
+            fd.write('[san]\n')
+            fd.write('subjectAltName=DNS:vyos\n')
+
+        openssl_req_cmd = ('openssl req -x509 -nodes -days {lifetime} '
+                           '-newkey rsa:4096 -keyout {key} -out {crt} '
+                           '-subj "/O=Sentrium/OU=VyOS/CN=vyos" '
+                           '-extensions san -config {san_conf}'
+                           ''.format(san_conf=san_config.name,
+                                     **cert_data))
+
+    else:
+        openssl_req_cmd = ('openssl req -x509 -nodes -days {lifetime} '
+                           '-newkey rsa:4096 -keyout {key} -out {crt} '
+                           '-subj "/O=Sentrium/OU=VyOS/CN=vyos" '
+                           '-addext "subjectAltName=DNS:vyos"'
+                           ''.format(**cert_data))
+
+    try:
+        subprocess.check_call(openssl_req_cmd, shell=True)
+    except subprocess.CalledProcessError as err:
+        print("Called process error: {}.".format(err))
+
+    os.chmod('{key}'.format(**cert_data), 0o400)
+
+    with open('{conf}'.format(**cert_data), 'w') as f:
+        f.write('ssl_certificate {crt};\n'.format(**cert_data))
+        f.write('ssl_certificate_key {key};\n'.format(**cert_data))
+
+    if san_config:
+        san_config.close()
+
+def get_config():
+    vyos_cert = vyos.defaults.vyos_cert_data
+
+    conf = Config()
+    if not conf.exists('service https certificates system-generated-certificate'):
+        return None
+    else:
+        conf.set_level('service https certificates system-generated-certificate')
+
+    if conf.exists('lifetime'):
+        lifetime = conf.return_value('lifetime')
+        vyos_cert['lifetime'] = lifetime
+
+    return vyos_cert
+
+def verify(vyos_cert):
+    return None
+
+def generate(vyos_cert):
+    if vyos_cert is None:
+        return None
+
+    if not status_self_signed(vyos_cert):
+        generate_self_signed(vyos_cert)
+
+def apply(vyos_cert):
+    for dep in dependencies:
+        cmd = '{0}/{1}'.format(vyos_conf_scripts_dir, dep)
+        try:
+            subprocess.check_call(cmd, shell=True)
+        except subprocess.CalledProcessError as err:
+            raise ConfigError("{}.".format(err))
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)