diff --git a/actions/quassel b/actions/quassel
new file mode 100755
index 000000000..5beacb7d2
--- /dev/null
+++ b/actions/quassel
@@ -0,0 +1,55 @@
+#!/usr/bin/python3
+#
+# This file is part of FreedomBox.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+"""
+Configuration helper for Quassel.
+"""
+
+import argparse
+import pathlib
+
+
+def parse_arguments():
+    """Return parsed command line arguments as dictionary."""
+    parser = argparse.ArgumentParser()
+    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
+
+    subparser = subparsers.add_parser('set-domain',
+                                      help='Setup Cockpit configuration')
+    subparser.add_argument('domain_name', help='Domain name to be allowed')
+
+    subparsers.required = True
+    return parser.parse_args()
+
+
+def subcommand_set_domain(arguments):
+    """Write a file containing domain name."""
+    domain_file = pathlib.Path('/var/lib/quassel/domain-freedombox')
+    domain_file.write_text(arguments.domain_name)
+
+
+def main():
+    """Parse arguments and perform all duties."""
+    arguments = parse_arguments()
+
+    subcommand = arguments.subcommand.replace('-', '_')
+    subcommand_method = globals()['subcommand_' + subcommand]
+    subcommand_method(arguments)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index dadde0996..dcdbdcf4a 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -18,16 +18,19 @@
 FreedomBox app for Quassel.
 """
 
+import pathlib
+
 from django.urls import reverse_lazy
 from django.utils.translation import ugettext_lazy as _
 
-from plinth import action_utils
+from plinth import action_utils, actions
 from plinth import app as app_module
 from plinth import cfg, frontpage, menu
 from plinth.daemon import Daemon
+from plinth.modules import names
 from plinth.modules.firewall.components import Firewall
+from plinth.modules.letsencrypt.components import LetsEncrypt
 from plinth.utils import format_lazy
-from plinth.views import AppView
 
 from .manifest import backup, clients  # noqa, pylint: disable=unused-import
 
@@ -37,6 +40,8 @@ managed_services = ['quasselcore']
 
 managed_packages = ['quassel-core']
 
+managed_paths = [pathlib.Path('/var/lib/quassel/')]
+
 name = _('Quassel')
 
 short_description = _('IRC Client')
@@ -92,6 +97,15 @@ class QuasselApp(app_module.App):
                             is_external=True)
         self.add(firewall)
 
+        letsencrypt = LetsEncrypt(
+            'letsencrypt-quassel', domains=get_domains,
+            daemons=managed_services, should_copy_certificates=True,
+            private_key_path='/var/lib/quassel/quasselCert.pem',
+            certificate_path='/var/lib/quassel/quasselCert.pem',
+            user_owner='quasselcore', group_owner='quassel',
+            managing_app='quassel')
+        self.add(letsencrypt)
+
         daemon = Daemon('daemon-quassel', managed_services[0])
         self.add(daemon)
 
@@ -106,20 +120,11 @@ def init():
         app.set_enabled(True)
 
 
-class QuasselAppView(AppView):
-    app_id = 'quassel'
-    diagnostics_module_name = 'quassel'
-    name = name
-    description = description
-    clients = clients
-    manual_page = manual_page
-    port_forwarding_info = port_forwarding_info
-
-
 def setup(helper, old_version=None):
     """Install and configure the module."""
     helper.install(managed_packages)
     helper.call('post', app.enable)
+    app.get_component('letsencrypt-quassel').setup_certificates()
 
 
 def diagnose():
@@ -130,3 +135,40 @@ def diagnose():
     results.append(action_utils.diagnose_port_listening(4242, 'tcp6'))
 
     return results
+
+
+def get_available_domains():
+    """Return an iterator with all domains able to have a certificate."""
+    return (domain.name for domain in names.components.DomainName.list()
+            if domain.domain_type.can_have_certificate)
+
+
+def set_domain(domain):
+    """Set the TLS domain by writing a file to data directory."""
+    if domain:
+        actions.superuser_run('quassel', ['set-domain', domain])
+
+
+def get_domain():
+    """Read TLS domain from config file select first available if none."""
+    domain = None
+    try:
+        with open('/var/lib/quassel/domain-freedombox') as file_handle:
+            domain = file_handle.read().strip()
+    except FileNotFoundError:
+        pass
+
+    if not domain:
+        domain = next(get_available_domains(), None)
+        set_domain(domain)
+
+    return domain
+
+
+def get_domains():
+    """Return a list with the configured domain for quassel."""
+    domain = get_domain()
+    if domain:
+        return [domain]
+
+    return []
diff --git a/plinth/modules/quassel/forms.py b/plinth/modules/quassel/forms.py
new file mode 100644
index 000000000..5455b7fc1
--- /dev/null
+++ b/plinth/modules/quassel/forms.py
@@ -0,0 +1,42 @@
+#
+# This file is part of FreedomBox.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+"""
+Forms for Quassel app.
+"""
+
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+from plinth.forms import AppForm
+from plinth.modules import quassel
+
+
+def get_domain_choices():
+    """Double domain entries for inclusion in the choice field."""
+    return ((domain, domain) for domain in quassel.get_available_domains())
+
+
+class QuasselForm(AppForm):
+    """Form to select a TLS domain for Quassel."""
+
+    domain = forms.ChoiceField(
+        choices=get_domain_choices,
+        label=_('TLS domain'),
+        help_text=_(
+            'Select a domain to use TLS with. If the list is empty, please '
+            'configure at least one domain with certificates.'),
+    )
diff --git a/plinth/modules/quassel/urls.py b/plinth/modules/quassel/urls.py
index a2dc6f9c0..fb64091d5 100644
--- a/plinth/modules/quassel/urls.py
+++ b/plinth/modules/quassel/urls.py
@@ -20,7 +20,7 @@ URLs for the quassel module.
 
 from django.conf.urls import url
 
-from plinth.modules.quassel import QuasselAppView
+from .views import QuasselAppView
 
 urlpatterns = [
     url(r'^apps/quassel/$', QuasselAppView.as_view(), name='index'),
diff --git a/plinth/modules/quassel/views.py b/plinth/modules/quassel/views.py
new file mode 100644
index 000000000..62e018079
--- /dev/null
+++ b/plinth/modules/quassel/views.py
@@ -0,0 +1,48 @@
+#
+# This file is part of FreedomBox.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+from plinth.modules import quassel
+from plinth.views import AppView
+
+from .forms import QuasselForm
+
+
+class QuasselAppView(AppView):
+    app_id = 'quassel'
+    diagnostics_module_name = 'quassel'
+    name = quassel.name
+    description = quassel.description
+    clients = quassel.clients
+    manual_page = quassel.manual_page
+    port_forwarding_info = quassel.port_forwarding_info
+    form_class = QuasselForm
+
+    def get_initial(self):
+        """Return the values to fill in the form."""
+        initial = super().get_initial()
+        initial['domain'] = quassel.get_domain()
+        return initial
+
+    def form_valid(self, form):
+        """Change the access control of Radicale service."""
+        data = form.cleaned_data
+        if quassel.get_domain() != data['domain']:
+            quassel.set_domain(data['domain'])
+            quassel.app.get_component(
+                'letsencrypt-quassel').setup_certificates()
+
+        return super().form_valid(form)