diff options
Diffstat (limited to 'synapse/rest/client/v2_alpha/account.py')
| -rw-r--r-- | synapse/rest/client/v2_alpha/account.py | 66 |
1 files changed, 57 insertions, 9 deletions
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py index 3481477731..455051ac46 100644 --- a/synapse/rest/client/v2_alpha/account.py +++ b/synapse/rest/client/v2_alpha/account.py @@ -17,6 +17,11 @@ import logging import random from http import HTTPStatus +from typing import TYPE_CHECKING +from urllib.parse import urlparse + +if TYPE_CHECKING: + from synapse.app.homeserver import HomeServer from synapse.api.constants import LoginType from synapse.api.errors import ( @@ -98,6 +103,9 @@ class EmailPasswordRequestTokenRestServlet(RestServlet): Codes.THREEPID_DENIED, ) + # Raise if the provided next_link value isn't valid + assert_valid_next_link(self.hs, next_link) + # The email will be sent to the stored address. # This avoids a potential account hijack by requesting a password reset to # an email address which is controlled by the attacker but which, after @@ -446,6 +454,9 @@ class EmailThreepidRequestTokenRestServlet(RestServlet): Codes.THREEPID_DENIED, ) + # Raise if the provided next_link value isn't valid + assert_valid_next_link(self.hs, next_link) + existing_user_id = await self.store.get_user_id_by_threepid("email", email) if existing_user_id is not None: @@ -517,6 +528,9 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet): Codes.THREEPID_DENIED, ) + # Raise if the provided next_link value isn't valid + assert_valid_next_link(self.hs, next_link) + existing_user_id = await self.store.get_user_id_by_threepid("msisdn", msisdn) if existing_user_id is not None: @@ -603,15 +617,10 @@ class AddThreepidEmailSubmitTokenServlet(RestServlet): # Perform a 302 redirect if next_link is set if next_link: - if next_link.startswith("file:///"): - logger.warning( - "Not redirecting to next_link as it is a local file: address" - ) - else: - request.setResponseCode(302) - request.setHeader("Location", next_link) - finish_request(request) - return None + request.setResponseCode(302) + request.setHeader("Location", next_link) + finish_request(request) + return None # Otherwise show the success template html = self.config.email_add_threepid_template_success_html_content @@ -875,6 +884,45 @@ class ThreepidDeleteRestServlet(RestServlet): return 200, {"id_server_unbind_result": id_server_unbind_result} +def assert_valid_next_link(hs: "HomeServer", next_link: str): + """ + Raises a SynapseError if a given next_link value is invalid + + next_link is valid if the scheme is http(s) and the next_link.domain_whitelist config + option is either empty or contains a domain that matches the one in the given next_link + + Args: + hs: The homeserver object + next_link: The next_link value given by the client + + Raises: + SynapseError: If the next_link is invalid + """ + valid = True + + # Parse the contents of the URL + next_link_parsed = urlparse(next_link) + + # Scheme must not point to the local drive + if next_link_parsed.scheme == "file": + valid = False + + # If the domain whitelist is set, the domain must be in it + if ( + valid + and hs.config.next_link_domain_whitelist is not None + and next_link_parsed.hostname not in hs.config.next_link_domain_whitelist + ): + valid = False + + if not valid: + raise SynapseError( + 400, + "'next_link' domain not included in whitelist, or not http(s)", + errcode=Codes.INVALID_PARAM, + ) + + class WhoamiRestServlet(RestServlet): PATTERNS = client_patterns("/account/whoami$") |