Add ability to perform password reset via email without trusting the identity server (#5377)

Sends password reset emails from the homeserver instead of proxying to the identity server. This is now the default behaviour for security reasons. If you wish to continue proxying password reset requests to the identity server you must now enable the email.trust_identity_server_for_password_resets option.

This PR is a culmination of 3 smaller PRs which have each been separately reviewed:

* #5308
* #5345
* #5368

1 files changed, 9 insertions, 0 deletions

diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index e91697049c..66201d6efe 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -339,6 +339,15 @@ class UnsupportedRoomVersionError(SynapseError):
         )
 
 
+class ThreepidValidationError(SynapseError):
+    """An error raised when there was a problem authorising an event."""
+
+    def __init__(self, *args, **kwargs):
+        if "errcode" not in kwargs:
+            kwargs["errcode"] = Codes.FORBIDDEN
+        super(ThreepidValidationError, self).__init__(*args, **kwargs)
+
+
 class IncompatibleRoomVersionError(SynapseError):
     """A server is trying to join a room whose version it does not support.