diff options
Diffstat (limited to 'src/leap/soledad/server.py')
| -rw-r--r-- | src/leap/soledad/server.py | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/leap/soledad/server.py b/src/leap/soledad/server.py index e2944057..5a2bb81f 100644 --- a/src/leap/soledad/server.py +++ b/src/leap/soledad/server.py @@ -30,8 +30,13 @@ try: except ImportError: import json # noqa + +from hashlib import sha256 +from routes.mapper import Mapper +from u1db import DBNAME_CONSTRAINTS from u1db.remote import http_app + # Keep OpenSSL's tsafe before importing Twisted submodules so we can put # it back if Twisted==12.0.0 messes with it. from OpenSSL import tsafe @@ -50,6 +55,7 @@ if version.base() == "12.0.0": from couchdb.client import Server +from leap.soledad import SECRETS_DOC_ID_HASH_PREFIX from leap.soledad.backends.couch import CouchServerState @@ -63,6 +69,115 @@ class Unauthorized(Exception): """ +class URLToAuth(object): + """ + Verify if actions can be performed by a user. + """ + + HTTP_METHOD_GET = 'GET' + HTTP_METHOD_PUT = 'PUT' + HTTP_METHOD_DELETE = 'DELETE' + HTTP_METHOD_POST = 'POST' + + def __init__(self, uuid): + """ + Initialize the mapper. + + The C{uuid} is used to create the rules that will either allow or + disallow the user to perform specific actions. + + @param uuid: The user uuid. + @type uuid: str + """ + self._map = Mapper(controller_scan=None) + self._register_auth_info(self._uuid_dbname(uuid)) + + def is_authorized(self, environ): + """ + Return whether an HTTP request that produced the CGI C{environ} + corresponds to an authorized action. + + @param environ: Dictionary containing CGI variables. + @type environ: dict + + @return: Whether the action is authorized or not. + @rtype: bool + """ + return self._map.match(environ=environ) is not None + + def _register(self, pattern, http_methods): + """ + Register a C{pattern} in the mapper as valid for C{http_methods}. + + @param pattern: The URL pattern that corresponds to the user action. + @type pattern: str + @param http_methods: A list of authorized HTTP methods. + @type http_methods: list of str + """ + self._map.connect( + None, pattern, http_methods=http_methods, + conditions=dict(method=http_methods), + requirements={'dbname': DBNAME_CONSTRAINTS}) + + def _uuid_dbname(self, uuid): + """ + Return the database name corresponding to C{uuid}. + + @param uuid: The user uid. + @type uuid: str + + @return: The database name corresponding to C{uuid}. + @rtype: str + """ + return sha256('%s%s' % (SECRETS_DOC_ID_HASH_PREFIX, uuid)).hexdigest() + + def _register_auth_info(self, dbname): + """ + Register the authorization info in the mapper using C{dbname} as the + user's database name. + + This method sets up the following authorization rules: + + URL path | Authorized actions + -------------------------------------------------- + / | GET + /shared-db | GET + /shared-db/docs | - + /shared-db/doc/{id} | GET, PUT, DELETE + /shared-db/sync-from/{source} | - + /user-db | GET, PUT, DELETE + /user-db/docs | - + /user-db/doc/{id} | - + /user-db/sync-from/{source} | GET, PUT, POST + + @param dbname: The name of the user's database. + @type dbname: str + """ + # auth info for global resource + self._register('/', [self.HTTP_METHOD_GET]) + # auth info for shared-db database resource + self._register( + '/%s' % SoledadApp.SHARED_DB_NAME, + [self.HTTP_METHOD_GET]) + # auth info for shared-db doc resource + self._register( + '/%s/doc/{id:.*}' % SoledadApp.SHARED_DB_NAME, + [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT, + self.HTTP_METHOD_DELETE]) + # auth info for user-db database resource + self._register( + '/%s' % dbname, + [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT, + self.HTTP_METHOD_DELETE]) + # auth info for user-db sync resource + self._register( + '/%s/sync-from/{source_replica_uid}' % dbname, + [self.HTTP_METHOD_GET, self.HTTP_METHOD_PUT, + self.HTTP_METHOD_POST]) + # generate the regular expressions + self._map.create_regs() + + class SoledadAuthMiddleware(object): """ Soledad Authentication WSGI middleware. @@ -150,6 +265,9 @@ class SoledadAuthMiddleware(object): if not self.verify_token(environ, uuid, token): return unauth_err("Incorrect address or token.") + if not self.verify_action(uuid, environ): + return unauth_err("Unauthorized action.") + del environ[self.HTTP_AUTH_KEY] return self._app(environ, start_response) @@ -183,6 +301,22 @@ class SoledadAuthMiddleware(object): return False return True + def verify_action(self, uuid, environ): + """ + Verify if the user is authorized to perform the requested action over + the requested database. + + @param uuid: The user's uuid. + @type uuid: str + @param environ: Dictionary containing CGI variables. + @type environ: dict + + @return: Whether the user is authorize to perform the requested action + over the requested db. + @rtype: bool + """ + return URLToAuth(uuid).is_authorized(environ) + #----------------------------------------------------------------------------- # Soledad WSGI application |