[feature] require authentication token for api

implements a global auth token for the app.

this token is written to .config/leap/authtoken, and passed to the
anchor part of the landing URI when opening the index resource by the
browser.

- Resolves: #8765

4 files changed, 38 insertions, 18 deletions

diff --git a/src/leap/bitmask/core/service.py b/src/leap/bitmask/core/service.py
index 902bfa6b..c06a5343 100644
--- a/src/leap/bitmask/core/service.py
+++ b/src/leap/bitmask/core/service.py
@@ -18,6 +18,8 @@
 Bitmask-core Service.
 """
 import json
+import os
+import uuid
 try:
     import resource
 except ImportError:
@@ -62,6 +64,16 @@ class BitmaskBackend(configurable.ConfigurableService):
 
         configurable.ConfigurableService.__init__(self, basedir)
         self.core_commands = BackendCommands(self)
+
+        # The global token is used for authenticating some of the channels that
+        # expose the dispatcher. For the moment being, this is the REST API.
+        self.global_tokens = [uuid.uuid4().hex]
+        logger.info('Global token: {0}'.format(self.global_tokens[0]))
+        self._touch_token_file()
+
+        # These tokens are user-session tokens. Implemented and rolled back,
+        # unused for now. If we don't move forward with user-session tokens on
+        # top of the global app token, this should be removed.
         self.tokens = {}
 
         def enabled(service):
@@ -89,6 +101,12 @@ class BitmaskBackend(configurable.ConfigurableService):
         if enabled('websockets'):
             on_start(self._init_websockets)
 
+    def _touch_token_file(self):
+        path = os.path.join(self.basedir, 'authtoken')
+        with open(path, 'w') as f:
+            f.write(self.global_tokens[0])
+        os.chmod(path, 0600)
+
     def init_events(self):
         event_server.ensure_server()
 
diff --git a/src/leap/bitmask/core/web/_auth.py b/src/leap/bitmask/core/web/_auth.py
index 2747fae8..aa6aeb9b 100644
--- a/src/leap/bitmask/core/web/_auth.py
+++ b/src/leap/bitmask/core/web/_auth.py
@@ -6,6 +6,7 @@ from twisted.web.guard import HTTPAuthSessionWrapper, BasicCredentialFactory
 from twisted.web.resource import IResource
 
 
+# Deprecate if the user-session tokens are finally not used.
 class TokenCredentialFactory(BasicCredentialFactory):
     scheme = 'token'
 
@@ -37,11 +38,11 @@ class WhitelistHTTPAuthSessionWrapper(HTTPAuthSessionWrapper):
         return HTTPAuthSessionWrapper.render(self, request)
 
 
-def protectedResourceFactory(resource, session_tokens, whitelist):
+def protectedResourceFactory(resource, tokens, whitelist):
     realm = HttpPasswordRealm(resource)
-    checker = TokenDictChecker(session_tokens)
-    resource_portal = portal.Portal(realm, [checker])
+    checker = TokenDictChecker(tokens)
     credentialFactory = TokenCredentialFactory('localhost')
+    resource_portal = portal.Portal(realm, [checker])
     protected_resource = WhitelistHTTPAuthSessionWrapper(
         resource_portal, [credentialFactory],
         whitelist=whitelist)
diff --git a/src/leap/bitmask/core/web/api.py b/src/leap/bitmask/core/web/api.py
index d31afa50..01c65bae 100644
--- a/src/leap/bitmask/core/web/api.py
+++ b/src/leap/bitmask/core/web/api.py
@@ -11,11 +11,20 @@ class Api(Resource):
 
     isLeaf = True
 
-    def __init__(self, dispatcher):
+    def __init__(self, dispatcher, global_tokens):
         Resource.__init__(self)
         self.dispatcher = dispatcher
+        self.global_tokens = global_tokens
 
     def render_POST(self, request):
+        token = request.getHeader('x-bitmask-auth')
+        if not token:
+            request.setResponseCode(401)
+            return 'unauthorized: no app token'
+        elif token.strip() not in self.global_tokens:
+            request.setResponseCode(401)
+            return 'unauthorized: bad app token'
+
         command = request.uri.split('/')[2:]
         params = request.content.getvalue()
         if params:
diff --git a/src/leap/bitmask/core/web/service.py b/src/leap/bitmask/core/web/service.py
index c1d839e8..2b8a7343 100644
--- a/src/leap/bitmask/core/web/service.py
+++ b/src/leap/bitmask/core/web/service.py
@@ -61,11 +61,6 @@ class HTTPDispatcherService(service.Service):
     API_WHITELIST = (
         '/API/core/version',
         '/API/core/stats',
-        '/API/bonafide/user/create',
-        '/API/bonafide/user/authenticate',
-        '/API/bonafide/provider/list',
-        '/API/bonafide/provider/create',
-        '/API/bonafide/provider/read',
     )
 
     def __init__(self, core, port=7070, debug=False, onion=False):
@@ -76,7 +71,6 @@ class HTTPDispatcherService(service.Service):
         self.uri = ''
 
     def startService(self):
-        # TODO refactor this, too long----------------------------------------
         if HAS_WEB_UI:
             webdir = os.path.abspath(
                 pkg_resources.resource_filename('leap.bitmask_js', 'public'))
@@ -91,18 +85,16 @@ class HTTPDispatcherService(service.Service):
                 'ui', 'app', 'lib', 'bitmask.js')
             jsapi = File(os.path.abspath(jspath))
 
-        api = Api(CommandDispatcher(self._core))
-        # protected_api = protectedResourceFactory(
-        #    api, self._core.tokens, self.API_WHITELIST)
+        api = Api(CommandDispatcher(self._core), self._core.global_tokens)
 
         root = File(webdir)
+        root.putChild(u'API', api)
 
-        # FIXME -- switching off the protected api, due to
-        # https://0xacab.org/leap/bitmask-dev/issues/9
+        # XXX remove it we don't bring session tokens again
+        # protected_api = protectedResourceFactory(
+        # api, self._core.global_tokens, self.API_WHITELIST)
         # root.putChild(u'API', protected_api)
-        # -------------------------------------------------
 
-        root.putChild(u'API', api)
         if not HAS_WEB_UI:
             root.putChild('bitmask.js', jsapi)
 
@@ -110,7 +102,7 @@ class HTTPDispatcherService(service.Service):
         self.site = factory
 
         if self.onion and _has_txtorcon():
-                self._start_onion_service(factory)
+            self._start_onion_service(factory)
         else:
             interface = '127.0.0.1'
             endpoint = endpoints.TCP4ServerEndpoint(