Added preliminary event handling for front-end

certidude/api.py

@@ -21,6 +21,15 @@ RE_HOSTNAME = "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0
 def omit(**kwargs):
     return dict([(key,value) for (key, value) in kwargs.items() if value])
 
+def event_source(func):
+    def wrapped(self, req, resp, ca, *args, **kwargs):
+        if req.get_header("Accept") == "text/event-stream":
+            resp.status = falcon.HTTP_SEE_OTHER
+            resp.location = ca.push_server + "/ev/" + ca.uuid
+            print("Delegating EventSource handling to:", resp.location)
+        return func(self, req, resp, ca, *args, **kwargs)
+    return wrapped
+
 def authorize_admin(func):
     def wrapped(self, req, resp, *args, **kwargs):
         authority = kwargs.get("ca")
@@ -276,12 +285,12 @@ class RequestListResource(CertificateAuthorityBase):
             raise falcon.HTTPConflict(
                 "CSR with such CN already exists",
                 "Will not overwrite existing certificate signing request, explicitly delete CSR and try again")
-
+        ca.event_publish("request_submitted", request.fingerprint())
         # Wait the certificate to be signed if waiting is requested
         if req.get_param("wait"):
-            if ca.subscribe_certificate_url:
+            if ca.push_server:
                 # Redirect to nginx pub/sub
-                url = ca.subscribe_certificate_url % dict(request_sha1sum=request.fingerprint())
+                url = ca.push_server + "/lp/" + request.fingerprint()
                 click.echo("Redirecting to: %s"  % url)
                 resp.status = falcon.HTTP_SEE_OTHER
                 resp.append_header("Location", url)
@@ -299,6 +308,8 @@ class RequestListResource(CertificateAuthorityBase):
             # Request was accepted, but not processed
             resp.status = falcon.HTTP_202
 
+
+
 class CertificateStatusResource(CertificateAuthorityBase):
     """
     openssl ocsp -issuer CAcert_class1.pem -serial 0x<serial no in hex> -url http://localhost -CAfile cacert_both.pem
@@ -322,6 +333,7 @@ class IndexResource(CertificateAuthorityBase):
     @login_required
     @pop_certificate_authority
     @authorize_admin
+    @event_source
     @templatize("index.html")
     def on_get(self, req, resp, ca, user):
         return locals()

certidude/auth.py

@@ -1,60 +0,0 @@
-
-import click
-import falcon
-import kerberos
-import os
-import re
-import socket
-
-# Vanilla Kerberos provides only username.
-# AD also embeds PAC (Privilege Attribute Certificate), which
-# is supposed to be sent via HTTP headers and it contains
-# the groups user is part of.
-# Even then we would have to manually look up the e-mail
-# address eg via LDAP, hence to keep things simple
-# we simply use Kerberos to authenticate.
-
-FQDN = socket.getaddrinfo(socket.gethostname(), 0, flags=socket.AI_CANONNAME)[0][3]
-
-if not os.getenv("KRB5_KTNAME"):
-    click.echo("Kerberos keytab not specified, set environment variable 'KRB5_KTNAME'", err=True)
-    exit(250)
-
-try:
-    principal = kerberos.getServerPrincipalDetails("HTTP", FQDN)
-except kerberos.KrbError as exc:
-    click.echo("Failed to initialize Kerberos, reason: %s" % exc, err=True)
-    exit(249)
-else:
-    click.echo("Kerberos enabled, service principal is HTTP/%s" % FQDN)
-
-def login_required(func):
-    def wrapped(resource, req, resp, *args, **kwargs):
-        authorization = req.get_header("Authorization")
-
-        if not authorization:
-            resp.append_header("WWW-Authenticate", "Negotiate")
-            raise falcon.HTTPUnauthorized("Unauthorized", "No Kerberos ticket offered?")
-
-        token = ''.join(authorization.split()[1:])
-
-        rc, context = kerberos.authGSSServerInit("HTTP@" + FQDN)
-        if rc != kerberos.AUTH_GSS_COMPLETE:
-            raise falcon.HTTPForbidden("Forbidden", "Kerberos ticket expired?")
-
-        rc = kerberos.authGSSServerStep(context, token)
-        kerberos_user = kerberos.authGSSServerUserName(context).split("@")
-
-        # References lost beyond this point! Results in
-        # ValueError: PyCapsule_SetPointer called with null pointer
-        kerberos.authGSSServerClean(context)
-
-        if rc == kerberos.AUTH_GSS_COMPLETE:
-            kwargs["user"] = kerberos_user
-            return func(resource, req, resp, *args, **kwargs)
-        elif rc == kerberos.AUTH_GSS_CONTINUE:
-            raise falcon.HTTPUnauthorized("Unauthorized", "Tried GSSAPI")
-        else:
-            raise falcon.HTTPForbidden("Forbidden", "Tried GSSAPI")
-
-    return wrapped

certidude/helpers.py

@@ -155,7 +155,10 @@ def certidude_request_certificate(url, key_path, request_path, certificate_path,
                 assert buf, "Server responded with no body, status code %d" % response.code
                 cert = crypto.load_certificate(crypto.FILETYPE_PEM, buf)
             except crypto.Error:
-                raise ValueError("Failed to parse PEM: %s" % buf)
+                if buf == b'-----BEGIN CERTIFICATE-----\n-----END CERTIFICATE-----\n':
+                    raise ValueError("Server refused to sign the request") # TODO: Raise proper exception
+                else:
+                    raise ValueError("Failed to parse PEM: %s" % buf)
             except urllib.error.HTTPError as e:
                 if e.code == 409:
                     click.echo("Different signing request with same CN is already present on server, server refuses to overwrite", err=True)

certidude/static/js/certidude.js

@@ -0,0 +1,30 @@
+$(document).ready(function() {
+    console.info("Opening EventSource from:", window.location.href);
+
+    var source = new EventSource(window.location.href);
+
+    source.onmessage = function(event) {
+        console.log("Received server-sent event:", event);
+    }
+
+    source.addEventListener("request_deleted", function(e) {
+        console.log("Removing deleted request #" + e.data);
+        $("#request_" + e.data).remove();
+    });
+
+    source.addEventListener("request_submitted", function(e) {
+        console.log("Request submitted:", e.data);
+    });
+
+    source.addEventListener("request_signed", function(e) {
+        console.log("Request signed:", e.data);
+        $("#request_" + e.data).remove();
+        // TODO: Insert <li> to signed certs list
+    });
+
+    source.addEventListener("certificate_revoked", function(e) {
+        console.log("Removing revoked certificate #" + e.data);
+        $("#certificate_" + e.data).remove();
+    });
+
+});

certidude/templates/index.html

@@ -9,6 +9,7 @@
     <link href="//fonts.googleapis.com/css?family=Gentium" rel="stylesheet" type="text/css"/>
     <link href="//fonts.googleapis.com/css?family=PT+Sans+Narrow" rel="stylesheet" type="text/css"/>
     <script type="text/javascript" src="/js/jquery-2.1.4.min.js"></script>
+    <script type="text/javascript" src="/js/certidude.js"></script>
 </head>
 <body>
 <div id="container">
@@ -75,7 +76,7 @@ certidude setup openvpn client {{request.url}}
 
 <ul>
     {% for j in ca.get_requests() %}
-        <li>
+        <li id="request_{{ j.fingerprint() }}">
             <a class="button" href="/api/{{ca.slug}}/request/{{j.common_name}}/">Fetch</a>
             {% if j.signable %}
             <button onClick="javascript:$.ajax({url:'/api/{{ca.slug}}/request/{{j.common_name}}/',type:'patch'});">Sign</button>
@@ -129,7 +130,7 @@ curl -f {{request.url}}/signed/$CN > $CN.crt
 
 <ul>
     {% for j in ca.get_signed() | sort | reverse %}
-        <li>
+        <li id="certificate_{{ j.fingerprint() }}">
             <a class="button" href="/api/{{ca.slug}}/signed/{{j.subject.CN}}/">Fetch</a>
             <button onClick="javascript:$.ajax({url:'/api/{{ca.slug}}/signed/{{j.subject.CN}}/',type:'delete'});">Revoke</button>
 
@@ -177,7 +178,7 @@ openssl ocsp -issuer ca.pem -CAfile ca.pem -url {{request.url}}/ocsp/ -serial 0x
 -->
 <ul>
     {% for j in ca.get_revoked() %}
-        <li>
+        <li id="certificate_{{ j.fingerprint() }}">
             {{j.changed}}
             {{j.serial_number}} <span class="monospace">{{j.distinguished_name}}</span>
         </li>

certidude/wrappers.py

@@ -28,14 +28,17 @@ def publish_certificate(func):
         cert = func(instance, csr, *args, **kwargs)
         assert isinstance(cert, Certificate), "notify wrapped function %s returned %s" % (func, type(cert))
 
-        if instance.publish_certificate_url:
-            url = instance.publish_certificate_url % dict(request_sha1sum=csr.fingerprint())
+        if instance.push_server:
+            url = instance.push_server + "/pub/?id=" + csr.fingerprint()
             notification = urllib.request.Request(url, cert.dump().encode("ascii"))
             notification.add_header("User-Agent", "Certidude API")
             notification.add_header("Content-Type", "application/x-x509-user-cert")
             click.echo("Publishing certificate at %s, waiting for response..." % url)
             response = urllib.request.urlopen(notification)
             response.read()
+
+            instance.event_publish("request_signed", csr.fingerprint())
+
         return cert
 
 # TODO: Implement e-mailing
@@ -85,7 +88,7 @@ class CertificateAuthorityConfig(object):
         section = "CA_" + slug
 
         dirs = dict([(key, self.get(section, key))
-            for key in ("dir", "certificate", "crl", "certs", "new_certs_dir", "private_key", "revoked_certs_dir", "request_subnets", "autosign_subnets", "admin_subnets", "admin_users", "publish_certificate_url", "subscribe_certificate_url", "inbox", "outbox")])
+            for key in ("dir", "certificate", "crl", "certs", "new_certs_dir", "private_key", "revoked_certs_dir", "request_subnets", "autosign_subnets", "admin_subnets", "admin_users", "push_server", "inbox", "outbox")])
 
         # Variable expansion, eg $dir
         for key, value in dirs.items():
@@ -299,6 +302,7 @@ class CertificateBase:
     def fingerprint(self):
         import binascii
         m, _ = self.pubkey
+        return "%x" % m
         return ":".join(re.findall("..", hashlib.sha1(binascii.unhexlify("%x" % m)).hexdigest()))
 
 class Request(CertificateBase):
@@ -424,7 +428,14 @@ class Certificate(CertificateBase):
         return self.signed <= other.signed
 
 class CertificateAuthority(object):
-    def __init__(self, slug, certificate, crl, certs, new_certs_dir, revoked_certs_dir=None, private_key=None, autosign_subnets=None, request_subnets=None, admin_subnets=None, admin_users=None, email_address=None, inbox=None, outbox=None, basic_constraints="CA:FALSE", key_usage="digitalSignature,keyEncipherment", extended_key_usage="clientAuth", certificate_lifetime=5*365, revocation_list_lifetime=1, publish_certificate_url=None, subscribe_certificate_url=None):
+    def __init__(self, slug, certificate, crl, certs, new_certs_dir, revoked_certs_dir=None, private_key=None, autosign_subnets=None, request_subnets=None, admin_subnets=None, admin_users=None, email_address=None, inbox=None, outbox=None, basic_constraints="CA:FALSE", key_usage="digitalSignature,keyEncipherment", extended_key_usage="clientAuth", certificate_lifetime=5*365, revocation_list_lifetime=1, push_server=None):
+
+        import hashlib
+        m = hashlib.sha512()
+        m.update(slug.encode("ascii"))
+        m.update(b"TODO:server-secret-goes-here")
+        self.uuid = m.hexdigest()
+
         self.slug = slug
         self.revocation_list = crl
         self.signed_dir = certs
@@ -438,8 +449,7 @@ class CertificateAuthority(object):
 
         self.certificate = Certificate(open(certificate))
         self.mailer = Mailer(outbox) if outbox else None
-        self.publish_certificate_url = publish_certificate_url
-        self.subscribe_certificate_url = subscribe_certificate_url
+        self.push_server = push_server
 
         self.certificate_lifetime = certificate_lifetime
         self.revocation_list_lifetime = revocation_list_lifetime
@@ -459,6 +469,29 @@ class CertificateAuthority(object):
             else:
                 self.admin_users = set([j for j in admin_users.split(" ") if j])
 
+    def event_publish(self, event_type, event_data):
+        """
+        Publish event on push server
+        """
+        url = self.push_server + "/pub?id=" + self.uuid # Derive CA's push channel URL
+
+        notification = urllib.request.Request(
+            url,
+            event_data.encode("utf-8"),
+            {"Event-ID": b"TODO", "Event-Type":event_type.encode("ascii")})
+        notification.add_header("User-Agent", "Certidude API")
+        click.echo("Posting event %s %s at %s, waiting for response..." % (repr(event_type), repr(event_data), repr(url)))
+        try:
+            response = urllib.request.urlopen(notification)
+            body = response.read()
+        except urllib.error.HTTPError as err:
+            if err.code == 404:
+                print("No subscribers on the channel")
+            else:
+                raise
+        else:
+            print("Push server returned:", response.code, body)
+
     def _signer_exec(self, cmd, *bits):
         sock = self.connect_signer()
         sock.send(cmd.encode("ascii"))
@@ -486,6 +519,7 @@ class CertificateAuthority(object):
         cert = Certificate(open(os.path.join(self.signed_dir, cn + ".pem")))
         revoked_filename = os.path.join(self.revoked_dir, "%s.pem" % cert.serial_number)
         os.rename(cert.path, revoked_filename)
+        self.event_publish("certificate_revoked", cert.fingerprint())
 
     def get_revoked(self):
         for root, dirs, files in os.walk(self.revoked_dir):
@@ -532,7 +566,28 @@ class CertificateAuthority(object):
         return os.path.exists(os.path.join(self.request_dir, cn + ".pem"))
 
     def delete_request(self, cn):
-        os.unlink(os.path.join(self.request_dir, cn + ".pem"))
+        path = os.path.join(self.request_dir, cn + ".pem")
+        request_sha1sum = Request(open(path)).fingerprint()
+        os.unlink(path)
+
+        # Publish event at CA channel
+        self.event_publish("request_deleted", request_sha1sum)
+
+        # Write empty certificate to long-polling URL
+        url = self.push_server + "/pub/?id=" + request_sha1sum
+        publisher = urllib.request.Request(url, b"-----BEGIN CERTIFICATE-----\n-----END CERTIFICATE-----\n")
+        publisher.add_header("User-Agent", "Certidude API")
+        click.echo("POST-ing empty certificate at %s, waiting for response..." % url)
+        try:
+            response = urllib.request.urlopen(publisher)
+            body = response.read()
+        except urllib.error.HTTPError as err:
+            if err.code == 404:
+                print("No subscribers on the channel")
+            else:
+                raise
+        else:
+            print("Push server returned:", response.code, body)
 
     def create_bundle(self, common_name, organizational_unit=None, email_address=None, overwrite=True):
         req = Request.create()