tests: Preliminary tests for Kerberos/LDAP auth

.travis.yml

@@ -14,7 +14,7 @@ install:
   - echo "127.0.0.1 www.example.lan www" | sudo tee -a /etc/hosts
   - sudo mkdir -p /etc/systemd/system
   - sudo pip install -r requirements.txt
-  - sudo pip install codecov pytest-cov
+  - sudo pip install codecov pytest-cov requests-kerberos
   - sudo pip install -e .
 script:
   - sudo find /home/ -type d -exec chmod 755 {} \; # Allow certidude serve to read templates

certidude/api/__init__.py

@@ -212,6 +212,12 @@ def certidude_app(log_handlers=[]):
     # Add sink for serving static files
     app.add_sink(StaticResource(os.path.join(__file__, "..", "..", "static")))
 
+    def log_exceptions(ex, req, resp, params):
+        logger.debug("Caught exception: %s" % ex)
+        raise ex
+
+    app.add_error_handler(Exception, log_exceptions)
+
     # Set up log handlers
     if config.LOGGING_BACKEND == "sql":
         from certidude.mysqllog import LogHandler

certidude/api/request.py

@@ -29,7 +29,7 @@ class RequestListResource(object):
         """
         Validate and parse certificate signing request
         """
-        reason = "No reason"
+        reasons = []
         body = req.stream.read(req.content_length)
         csr = x509.load_pem_x509_csr(body, default_backend())
         try:
@@ -79,7 +79,7 @@ class RequestListResource(object):
                     renewal_signature = b64decode(renewal_header)
                 except TypeError, ValueError:
                     logger.error("Renewal failed, bad signature supplied for %s", common_name.value)
-                    reason = "Renewal failed, bad signature supplied"
+                    reasons.append("Renewal failed, bad signature supplied")
                 else:
                     try:
                         verifier = cert.public_key().verifier(
@@ -95,15 +95,15 @@ class RequestListResource(object):
                         verifier.verify()
                     except InvalidSignature:
                         logger.error("Renewal failed, invalid signature supplied for %s", common_name.value)
-                        reason = "Renewal failed, invalid signature supplied"
+                        reasons.append("Renewal failed, invalid signature supplied")
                     else:
                         # At this point renewal signature was valid but we need to perform some extra checks
                         if datetime.utcnow() > cert.not_valid_after:
                             logger.error("Renewal failed, current certificate for %s has expired", common_name.value)
-                            reason = "Renewal failed, current certificate expired"
+                            reasons.append("Renewal failed, current certificate expired")
                         elif not config.CERTIFICATE_RENEWAL_ALLOWED:
                             logger.error("Renewal requested for %s, but not allowed by authority settings", common_name.value)
-                            reason = "Renewal requested, but not allowed by authority settings"
+                            reasons.append("Renewal requested, but not allowed by authority settings")
                         else:
                             resp.set_header("Content-Type", "application/x-x509-user-cert")
                             _, resp.body = authority._sign(csr, body, overwrite=True)
@@ -117,7 +117,6 @@ class RequestListResource(object):
         """
         if req.get_param_as_bool("autosign"):
             if "." not in common_name.value:
-                reason = "Autosign failed, IP address not whitelisted"
                 for subnet in config.AUTOSIGN_SUBNETS:
                     if req.context.get("remote_addr") in subnet:
                         try:
@@ -128,16 +127,18 @@ class RequestListResource(object):
                         except EnvironmentError:
                             logger.info("Autosign for %s from %s failed, signed certificate already exists",
                                 common_name.value, req.context.get("remote_addr"))
-                            reason = "Autosign failed, signed certificate already exists"
+                            reasons.append("Autosign failed, signed certificate already exists")
                         break
                 else:
-                reason = "Autosign failed, only client certificates allowed to be signed automatically"
+                    reasons.append("Autosign failed, IP address not whitelisted")
+            else:
+                reasons.append("Autosign failed, only client certificates allowed to be signed automatically")
 
         # Attempt to save the request otherwise
         try:
             csr = authority.store_request(body)
         except errors.RequestExists:
-            reason = "Same request already uploaded exists"
+            reasons.append("Same request already uploaded exists")
             # We should still redirect client to long poll URL below
         except errors.DuplicateCommonNameError:
             # TODO: Certificate renewal
@@ -161,7 +162,7 @@ class RequestListResource(object):
         else:
             # Request was accepted, but not processed
             resp.status = falcon.HTTP_202
-            resp.body = reason
+            resp.body = ". ".join(reasons)
 
 
 class RequestDetailResource(object):

certidude/auth.py

@@ -1,5 +1,6 @@
 
 import click
+import gssapi
 import falcon
 import logging
 import os
@@ -12,25 +13,12 @@ from certidude import config, const
 
 logger = logging.getLogger("api")
 
-if "kerberos" in config.AUTHENTICATION_BACKENDS:
-    import gssapi
 os.environ["KRB5_KTNAME"] = config.KERBEROS_KEYTAB
-    server_creds = gssapi.creds.Credentials(
-        usage='accept',
-        name=gssapi.names.Name('HTTP/%s'% (socket.gethostname())))
-    click.echo("Accepting requests only for realm: %s" % const.DOMAIN)
-
 
 def authenticate(optional=False):
     import falcon
     def wrapper(func):
         def kerberos_authenticate(resource, req, resp, *args, **kwargs):
-            # If LDAP enabled and device is not Kerberos capable fall
-            # back to LDAP bind authentication
-            if "ldap" in config.AUTHENTICATION_BACKENDS:
-                if "Android" in req.user_agent or "iPhone" in req.user_agent:
-                    return ldap_authenticate(resource, req, resp, *args, **kwargs)
-
             # Try pre-emptive authentication
             if not req.auth:
                 if optional:
@@ -43,9 +31,22 @@ def authenticate(optional=False):
                     "No Kerberos ticket offered, are you sure you've logged in with domain user account?",
                     ["Negotiate"])
 
+            server_creds = gssapi.creds.Credentials(
+                usage='accept',
+                name=gssapi.names.Name('HTTP/%s'% const.FQDN))
+
             context = gssapi.sec_contexts.SecurityContext(creds=server_creds)
+
+            if not req.auth.startswith("Negotiate "):
+                raise falcon.HTTPBadRequest("Bad request", "Bad header: %s" % req.auth)
+
             token = ''.join(req.auth.split()[1:])
+
+            try:
                 context.step(b64decode(token))
+            except TypeError: # base64 errors
+                raise falcon.HTTPBadRequest("Bad request", "Malformed token")
+
             username, domain = str(context.initiator_name).split("@")
 
             if domain.lower() != const.DOMAIN.lower():
@@ -82,7 +83,7 @@ def authenticate(optional=False):
                     ("Basic",))
 
             if not req.auth.startswith("Basic "):
-                raise falcon.HTTPForbidden("Forbidden", "Bad header: %s" % req.auth)
+                raise falcon.HTTPBadRequest("Bad request", "Bad header: %s" % req.auth)
 
             from base64 import b64decode
             basic, token = req.auth.split(" ", 1)
@@ -127,7 +128,7 @@ def authenticate(optional=False):
                 raise falcon.HTTPUnauthorized("Forbidden", "Please authenticate", ("Basic",))
 
             if not req.auth.startswith("Basic "):
-                raise falcon.HTTPForbidden("Forbidden", "Bad header: %s" % req.auth)
+                raise falcon.HTTPBadRequest("Bad request", "Bad header: %s" % req.auth)
 
             basic, token = req.auth.split(" ", 1)
             user, passwd = b64decode(token).split(":", 1)
@@ -142,14 +143,21 @@ def authenticate(optional=False):
             req.context["user"] = User.objects.get(user)
             return func(resource, req, resp, *args, **kwargs)
 
+        def wrapped(*args, **kwargs):
+            # If LDAP enabled and device is not Kerberos capable fall
+            # back to LDAP bind authentication
+            if "ldap" in config.AUTHENTICATION_BACKENDS:
+                if "Android" in req.user_agent or "iPhone" in req.user_agent:
+                    return ldap_authenticate(resource, req, resp, *args, **kwargs)
             if "kerberos" in config.AUTHENTICATION_BACKENDS:
-            return kerberos_authenticate
+                return kerberos_authenticate(*args, **kwargs)
             elif config.AUTHENTICATION_BACKENDS == {"pam"}:
-            return pam_authenticate
+                return pam_authenticate(*args, **kwargs)
             elif config.AUTHENTICATION_BACKENDS == {"ldap"}:
-            return ldap_authenticate
+                return ldap_authenticate(*args, **kwargs)
             else:
                 raise NotImplementedError("Authentication backend %s not supported" % config.AUTHENTICATION_BACKENDS)
+        return wrapped
     return wrapper
 
 

certidude/authority.py

@@ -134,7 +134,6 @@ def revoke(common_name):
     push.publish("certificate-revoked", common_name)
 
     # Publish CRL for long polls
-    if config.LONG_POLL_PUBLISH:
     url = config.LONG_POLL_PUBLISH % "crl"
     click.echo("Publishing CRL at %s ..." % url)
     requests.post(url, data=export_crl(),
@@ -220,7 +219,6 @@ def delete_request(common_name):
     push.publish("request-deleted", common_name)
 
     # Write empty certificate to long-polling URL
-    if config.LONG_POLL_PUBLISH:
     requests.delete(
         config.LONG_POLL_PUBLISH % hashlib.sha256(buf).hexdigest(),
         headers={"User-Agent": "Certidude API"})
@@ -370,13 +368,10 @@ def _sign(csr, buf, overwrite=False):
     else: # New keypair
         mailer.send("certificate-signed.md", **locals())
 
-    if config.LONG_POLL_PUBLISH:
     url = config.LONG_POLL_PUBLISH % hashlib.sha256(buf).hexdigest()
     click.echo("Publishing certificate at %s ..." % url)
     requests.post(url, data=cert_buf,
         headers={"User-Agent": "Certidude API", "Content-Type": "application/x-x509-user-cert"})
 
-    if config.EVENT_SOURCE_PUBLISH: # TODO: handle renewal
     push.publish("request-signed", common_name.value)
-
     return cert, cert_buf

certidude/cli.py

@@ -728,8 +728,9 @@ def certidude_setup_openvpn_networkmanager(authority, remote, common_name, **pat
 @fqdn_required
 def certidude_setup_authority(username, kerberos_keytab, nginx_config, country, state, locality, organization, organizational_unit, common_name, directory, authority_lifetime, push_server, outbox, server_flags):
     # Install only rarely changing stuff from OS package management
-    apt("python-setproctitle cython python-dev libkrb5-dev libldap2-dev libffi-dev libssl-dev")
+    apt("python-setproctitle cython python-dev libkrb5-dev libffi-dev libssl-dev")
-    apt("python-mimeparse python-markdown python-xattr python-jinja2 python-cffi python-openssl software-properties-common")
+    apt("python-mimeparse python-markdown python-xattr python-jinja2 python-cffi")
+    apt("python-ldap python-openssl software-properties-common libsasl2-modules-gssapi-mit")
     pip("gssapi falcon cryptography humanize ipaddress simplepam humanize requests")
     click.echo("Software dependencies installed")
 
@@ -1086,10 +1087,11 @@ def certidude_cron():
 
 
 @click.command("serve", help="Run server")
+@click.option("-e", "--exit-handler", default=False, is_flag=True, help="Install /api/exit/ handler")
 @click.option("-p", "--port", default=80, help="Listen port")
 @click.option("-l", "--listen", default="0.0.0.0", help="Listen address")
 @click.option("-f", "--fork", default=False, is_flag=True, help="Fork to background")
-def certidude_serve(port, listen, fork):
+def certidude_serve(port, listen, fork, exit_handler):
     from setproctitle import setproctitle
     from certidude.signer import SignServer
     from certidude import authority, const
@@ -1177,16 +1179,13 @@ def certidude_serve(port, listen, fork):
 
     click.echo("Serving API at %s:%d" % (listen, port))
     from wsgiref.simple_server import make_server, WSGIServer
-    from SocketServer import ForkingMixIn
     from certidude.api import certidude_app
 
-    class ThreadingWSGIServer(ForkingMixIn, WSGIServer):
-        pass
 
     click.echo("Listening on %s:%d" % (listen, port))
 
     app = certidude_app(log_handlers)
-    httpd = make_server(listen, port, app, ThreadingWSGIServer)
+    httpd = make_server(listen, port, app, WSGIServer)
 
 
     """
@@ -1198,7 +1197,6 @@ def certidude_serve(port, listen, fork):
     if os.path.exists("/etc/cron.hourly/certidude"):
         os.system("/etc/cron.hourly/certidude")
 
-    if config.EVENT_SOURCE_PUBLISH:
     from certidude.push import EventSourceLogHandler
     log_handlers.append(EventSourceLogHandler())
 
@@ -1222,14 +1220,18 @@ def certidude_serve(port, listen, fork):
         logger.debug("Started Certidude at %s", const.FQDN)
 
         drop_privileges()
-        def quit_handler(*args, **kwargs):
+
-            click.echo("Shutting down HTTP server...")
+        class ExitResource():
-            raise KeyboardInterrupt
+            """
-        signal.signal(signal.SIGHUP, quit_handler)
+            Provide way to gracefully shutdown server
-        try:
+            """
+            def on_get(self, req, resp):
+                assert httpd._BaseServer__shutdown_request == False
+                httpd._BaseServer__shutdown_request = True
+
+        if exit_handler:
+            app.add_route("/api/exit/", ExitResource())
         httpd.serve_forever()
-        except KeyboardInterrupt:
-            click.echo("Caught Ctrl-C, server stopped")
 
 
 @click.command("yubikey", help="Set up Yubikey as client authentication token")

certidude/config.py

@@ -73,19 +73,14 @@ LONG_POLL_SUBSCRIBE = cp.get("push", "long poll subscribe")
 
 LOGGING_BACKEND = cp.get("logging", "backend")
 
-if "whitelist" == AUTHORIZATION_BACKEND:
+USERS_WHITELIST = set([j for j in  cp.get("authorization", "user whitelist").split(" ") if j])
-    USERS_WHITELIST = set([j for j in  cp.get("authorization", "users whitelist").split(" ") if j])
+ADMINS_WHITELIST = set([j for j in  cp.get("authorization", "admin whitelist").split(" ") if j])
-    ADMINS_WHITELIST = set([j for j in  cp.get("authorization", "admins whitelist").split(" ") if j])
-elif "posix" == AUTHORIZATION_BACKEND:
 USERS_GROUP = cp.get("authorization", "posix user group")
 ADMIN_GROUP = cp.get("authorization", "posix admin group")
-elif "ldap" == AUTHORIZATION_BACKEND:
 LDAP_USER_FILTER = cp.get("authorization", "ldap user filter")
 LDAP_ADMIN_FILTER = cp.get("authorization", "ldap admin filter")
 if "%s" not in LDAP_USER_FILTER: raise ValueError("No placeholder %s for username in 'ldap user filter'")
 if "%s" not in LDAP_ADMIN_FILTER: raise ValueError("No placeholder %s for username in 'ldap admin filter'")
-else:
-    raise NotImplementedError("Unknown authorization backend '%s'" % AUTHORIZATION_BACKEND)
 
 TAG_TYPES = [j.split("/", 1) + [cp.get("tagging", j)] for j in cp.options("tagging")]
 

certidude/push.py

@@ -13,9 +13,6 @@ def publish(event_type, event_data):
     """
     assert event_type, "No event type specified"
     assert event_data, "No event data specified"
-    if not config.EVENT_SOURCE_PUBLISH:
-        # Push server disabled
-        return
 
     if not isinstance(event_data, basestring):
         from certidude.decorators import MyEncoder

certidude/templates/server/server.conf

@@ -9,7 +9,7 @@ backends = pam
 ;backends = ldap
 ;backends = kerberos ldap
 ;backends = kerberos pam
-ldap uri = ldaps://dc1.example.com
+ldap uri = ldaps://dc.example.lan
 kerberos keytab = FILE:{{ kerberos_keytab }}
 
 [accounts]
@@ -23,8 +23,8 @@ kerberos keytab = FILE:{{ kerberos_keytab }}
 backend = posix
 ;backend = ldap
 ldap gssapi credential cache = /run/certidude/krb5cc
-ldap uri = ldap://dc1.example.com
+ldap uri = ldap://dc.example.lan
-ldap base = {% if base %}{{ base }}{% else %}dc=example,dc=com{% endif %}
+ldap base = {% if base %}{{ base }}{% else %}dc=example,dc=lan{% endif %}
 
 [authorization]
 # The authorization backend specifies how the users are authorized.
@@ -38,7 +38,11 @@ posix admin group = sudo
 ;backend = ldap
 ldap computer filter = (&(objectclass=user)(objectclass=computer)(samaccountname=%s))
 ldap user filter = (&(objectclass=user)(objectcategory=person)(samaccountname=%s))
-ldap admin filter = (&(memberOf=cn=Domain Admins,cn=Users,{% if base %}{{ base }}{% else %}dc=example,dc=com{% endif %})(samaccountname=%s))
+ldap admin filter = (&(memberOf=cn=Domain Admins,cn=Users,{% if base %}{{ base }}{% else %}dc=example,dc=lan{% endif %})(samaccountname=%s))
+
+;backend = whitelist
+user whitelist =
+admin whitelist =
 
 # Users are allowed to log in from user subnets
 user subnets = 0.0.0.0/0

tests/test_cli.py

@@ -93,6 +93,7 @@ def clean_server():
             except OSError:
                 pass
 
+
     if os.path.exists("/var/lib/certidude/ca.example.lan"):
         shutil.rmtree("/var/lib/certidude/ca.example.lan")
     if os.path.exists("/etc/certidude/server.conf"):
@@ -126,10 +127,25 @@ def clean_server():
         if os.path.exists("/etc/openvpn/keys"):
             shutil.rmtree("/etc/openvpn/keys")
 
-    # System packages
+    # Stop samba
-    os.system("apt purge -y nginx libnginx-mod-nchan openvpn strongswan")
+    if os.path.exists("/run/samba/samba.pid"):
-    os.system("apt-get -y autoremove")
+        with open("/run/samba/samba.pid") as fh:
+            try:
+                os.kill(int(fh.read()), 15)
+            except OSError:
+                pass
+    if os.path.exists("/etc/krb5.conf"):
+        os.unlink("/etc/krb5.conf")
+    if os.path.exists("/etc/krb5.keytab"):
+        os.unlink("/etc/krb5.keytab")
+    if os.path.exists("/etc/certidude/server.keytab"):
+        os.unlink("/etc/certidude/server.keytab")
+    if os.path.exists("/var/lib/samba/"):
+        shutil.rmtree("/var/lib/samba")
+    os.makedirs("/var/lib/samba")
 
+    # Restore initial resolv.conf
+    shutil.copyfile("/etc/resolv.conf.orig", "/etc/resolv.conf")
 
 def test_cli_setup_authority():
     import os
@@ -137,9 +153,30 @@ def test_cli_setup_authority():
 
     assert os.getuid() == 0, "Run tests as root in a clean VM or container"
 
+    if not os.path.exists("/etc/resolv.conf.orig"):
+        shutil.copyfile("/etc/resolv.conf", "/etc/resolv.conf.orig")
+
     clean_server()
     clean_client()
 
+
+    # Bootstrap domain controller here,
+    # Samba startup takes some time
+    os.system("apt install -y samba krb5-user winbind")
+    if os.path.exists("/etc/samba/smb.conf"):
+        os.unlink("/etc/samba/smb.conf")
+    os.system("samba-tool domain provision --server-role=dc --domain=EXAMPLE --realm=EXAMPLE.LAN --host-name=ca")
+    os.system("samba-tool user add userbot S4l4k4l4 --given-name='User' --surname='Bot'")
+    os.system("samba-tool user add adminbot S4l4k4l4 --given-name='Admin' --surname='Bot'")
+    os.system("samba-tool user setpassword administrator --newpassword=S4l4k4l4")
+    os.symlink("/var/lib/samba/private/secrets.keytab", "/etc/krb5.keytab")
+    os.chmod("/var/lib/samba/private/secrets.keytab", 0644) # To allow access to certidude server
+    os.symlink("/var/lib/samba/private/krb5.conf", "/etc/krb5.conf")
+    with open("/etc/resolv.conf", "w") as fh:
+        fh.write("nameserver 127.0.0.1\nsearch example.lan\n")
+    # TODO: dig -t srv perhaps?
+    os.system("samba")
+
     from certidude.cli import entry_point as cli
     from certidude import const
 
@@ -156,7 +193,7 @@ def test_cli_setup_authority():
     assert os.system("nginx -t") == 0, "invalid nginx configuration"
     assert os.path.exists("/run/nginx.pid"), "nginx wasn't started up properly"
 
-    from certidude import config, authority
+    from certidude import config, authority, auth, user
     assert authority.ca_cert.serial_number >= 0x100000000000000000000000000000000000000
     assert authority.ca_cert.serial_number <= 0xfffffffffffffffffffffffffffffffffffffff
     assert authority.ca_cert.not_valid_before < datetime.now()
@@ -182,7 +219,7 @@ def test_cli_setup_authority():
     server_pid = os.fork()
     if not server_pid:
         # Fork to prevent umask, setuid, setgid side effects
-        result = runner.invoke(cli, ['serve', '-p', '8080', '-l', '127.0.1.1'])
+        result = runner.invoke(cli, ['serve', '-p', '8080', '-l', '127.0.1.1', '-e'])
         assert not result.exception, result.output
         return
 
@@ -519,15 +556,13 @@ def test_cli_setup_authority():
     # Test session API call
     r = client().simulate_get("/api/", headers={"Authorization":usertoken})
     assert r.status_code == 200
-
     r = client().simulate_get("/api/", headers={"Authorization":admintoken})
     assert r.status_code == 200
-
     r = client().simulate_get("/api/", headers={"Accept":"text/plain", "Authorization":admintoken})
     assert r.status_code == 415 # invalid media type
-
     r = client().simulate_get("/api/")
     assert r.status_code == 401
+    assert "Please authenticate" in r.text
 
 
     # Test token mech
@@ -568,9 +603,14 @@ def test_cli_setup_authority():
     # Beyond this point don't use client()
     const.STORAGE_PATH = "/tmp/"
 
+
     #############
     ### nginx ###
     #############
+
+    # In this case nginx is set up as web server with TLS certificates
+    # generated by certidude.
+
     clean_client()
 
     result = runner.invoke(cli, ["setup", "nginx", "-cn", "www", "ca.example.lan"])
@@ -612,11 +652,15 @@ def test_cli_setup_authority():
     # Test nginx setup
     assert os.system("nginx -t") == 0, "Generated nginx config was invalid"
 
+    # TODO: test client verification with curl
+
 
     ###############
     ### OpenVPN ###
     ###############
 
+    # First OpenVPN server is set up
+
     clean_client()
 
     if not os.path.exists("/etc/openvpn/keys"):
@@ -651,7 +695,8 @@ def test_cli_setup_authority():
     assert os.path.exists("/tmp/ca.example.lan/server_cert.pem")
     assert os.path.exists("/etc/openvpn/site-to-client.conf")
 
-    # Reset config
+    # Secondly OpenVPN client is set up
+
     os.unlink("/etc/certidude/client.conf")
     os.unlink("/etc/certidude/services.conf")
 
@@ -669,8 +714,9 @@ def test_cli_setup_authority():
     assert "Writing certificate to:" in result.output, result.output
     assert os.path.exists("/etc/openvpn/client-to-site.conf")
 
+    # TODO: Check that tunnel interfaces came up, perhaps try to ping?
     # TODO: assert key, req, cert paths were included correctly in OpenVPN config
-    # TODO: test client verification with curl
+
 
     ###############
     ### IPSec ###
@@ -755,6 +801,74 @@ def test_cli_setup_authority():
 
 
 
+    ####################################
+    ### Switch to Kerberos/LDAP auth ###
+    ####################################
+
+    # Shut down current instance
+    requests.get("http://ca.example.lan/api/exit")
+    requests.get("http://ca.example.lan/api/")
+    os.waitpid(server_pid, 0)
+
+    # Hacks, note that CA is domain controller
+    assert os.system("kdestroy") == 0
+    assert not os.path.exists("/tmp/krb5cc_0")
+
+    assert os.system("echo S4l4k4l4 | kinit administrator") == 0
+    assert os.path.exists("/tmp/krb5cc_0")
+    os.system("sed -e 's/CA/CA\\nkerberos method = system keytab/' -i /etc/samba/smb.conf ")
+
+    # Create service principals
+    spn_pid = os.fork()
+    if not spn_pid:
+        assert os.getuid() == 0 and os.getgid() == 0
+        os.environ["KRB5_KTNAME"] = "FILE:/etc/certidude/server.keytab"
+        assert os.system("net ads keytab add HTTP -k") == 0
+        assert os.path.exists("/etc/certidude/server.keytab")
+        os.system("chown root:certidude /etc/certidude/server.keytab")
+        os.system("chmod 640 /etc/certidude/server.keytab")
+        return
+    else:
+        os.waitpid(spn_pid, 0)
+
+    os.system("sed -e 's/ldap uri = ldaps:.*/ldap uri = ldaps:\\/\\/ca.example.lan/g' -i /etc/certidude/server.conf")
+    os.system("sed -e 's/ldap uri = ldap:.*/ldap uri = ldap:\\/\\/ca.example.lan/g' -i /etc/certidude/server.conf")
+    os.system("sed -e 's/backends = pam/backends = kerberos/g' -i /etc/certidude/server.conf")
+    os.system("sed -e 's/backend = posix/backend = ldap/g' -i /etc/certidude/server.conf")
+    os.system("/etc/cron.hourly/certidude") # Update server credential cache
+
+    result = runner.invoke(cli, ['users'])
+    assert not result.exception, result.output
+    # TODO: assert "Administrator@example.lan" in result.output
+
+    server_pid = os.fork() # Fork to prevent environment contamination
+    if not server_pid:
+        # Apply /etc/certidude/server.conf changes
+        reload(config)
+        reload(user)
+        reload(auth)
+
+        assert isinstance(user.User.objects, user.ActiveDirectoryUserManager), user.User.objects
+        result = runner.invoke(cli, ['serve', '-p', '8080', '-l', '127.0.1.1', '-e'])
+        assert not result.exception, result.output
+        return
+
+    sleep(1) # Wait for serve to start up
+
+    # TODO: pip install requests-kerberos
+    from requests_kerberos import HTTPKerberosAuth, OPTIONAL
+    auth = HTTPKerberosAuth(mutual_authentication=OPTIONAL, force_preemptive=True)
+
+    # Test session API call
+    r = requests.get("http://ca.example.lan/api/")
+    assert r.status_code == 401, r.text
+    assert "No Kerberos ticket offered" in r.text, r.text
+    r = requests.get("http://ca.example.lan/api/", headers={"Authorization": "Negotiate blerrgh"})
+    assert r.status_code == 400, r.text
+    r = requests.get("http://ca.example.lan/api/", auth=auth)
+    assert r.status_code == 200, r.text
+
+
     ###################
     ### Final tests ###
     ###################
@@ -783,18 +897,18 @@ def test_cli_setup_authority():
     assert authority.signer_exec("exit") == "ok"
 
     # Shut down server
-    with open("/run/certidude/server.pid") as fh:
+    requests.get("http://ca.example.lan/api/exit")
-        os.kill(int(fh.read()), 1)
+    os.waitpid(server_pid, 0)
 
     # Note: STORAGE_PATH was mangled above, hence it's /tmp not /var/lib/certidude
     assert open("/etc/apparmor.d/local/usr.lib.ipsec.charon").read() == "/tmp/** r,\n"
-
     assert len(inbox) == 0, inbox # Make sure all messages were checked
 
-    os.waitpid(server_pid, 0)
-
     os.system("service nginx stop")
     os.system("service openvpn stop")
     os.system("ipsec stop")
 
     clean_server()
+
+if __name__ == "__main__":
+    test_cli_setup_authority()