Merge remote-tracking branch 'origin/babolivier/info_mainline' into bbz/info-mainline2

docs/sample_config.yaml

@@ -974,6 +974,11 @@ account_validity:
 # Mandate that users are only allowed to associate certain formats of
 # 3PIDs with accounts on this server.
 #
+# Use an Identity Server to establish which 3PIDs are allowed to register?
+# Overrides allowed_local_3pids below.
+#
+#check_is_for_allowed_local_3pids: matrix.org
+#
 #allowed_local_3pids:
 #  - medium: email
 #    pattern: '.*@matrix\.org'

synapse/config/registration.py

@@ -99,6 +99,9 @@ class RegistrationConfig(Config):
 
         self.registrations_require_3pid = config.get("registrations_require_3pid", [])
         self.allowed_local_3pids = config.get("allowed_local_3pids", [])
+        self.check_is_for_allowed_local_3pids = config.get(
+            "check_is_for_allowed_local_3pids", None
+        )
         self.enable_3pid_lookup = config.get("enable_3pid_lookup", True)
         self.registration_shared_secret = config.get("registration_shared_secret")
 
@@ -247,6 +250,11 @@ class RegistrationConfig(Config):
         # Mandate that users are only allowed to associate certain formats of
         # 3PIDs with accounts on this server.
         #
+        # Use an Identity Server to establish which 3PIDs are allowed to register?
+        # Overrides allowed_local_3pids below.
+        #
+        #check_is_for_allowed_local_3pids: matrix.org
+        #
         #allowed_local_3pids:
         #  - medium: email
         #    pattern: '.*@matrix\\.org'

synapse/rest/client/v2_alpha/account.py

@@ -88,7 +88,7 @@ class EmailPasswordRequestTokenRestServlet(RestServlet):
         send_attempt = body["send_attempt"]
         next_link = body.get("next_link")  # Optional param
 
-        if not check_3pid_allowed(self.hs, "email", email):
+        if not await check_3pid_allowed(self.hs, "email", email):
             raise SynapseError(
                 403,
                 "Your email domain is not authorized on this server",
@@ -366,7 +366,7 @@ class EmailThreepidRequestTokenRestServlet(RestServlet):
         send_attempt = body["send_attempt"]
         next_link = body.get("next_link")  # Optional param
 
-        if not check_3pid_allowed(self.hs, "email", email):
+        if not await check_3pid_allowed(self.hs, "email", email):
             raise SynapseError(
                 403,
                 "Your email domain is not authorized on this server",
@@ -431,7 +431,7 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
 
         msisdn = phone_number_to_msisdn(country, phone_number)
 
-        if not check_3pid_allowed(self.hs, "msisdn", msisdn):
+        if not await check_3pid_allowed(self.hs, "msisdn", msisdn):
             raise SynapseError(
                 403,
                 "Account phone numbers are not authorized on this server",

synapse/rest/client/v2_alpha/register.py

@@ -123,10 +123,10 @@ class EmailRegisterRequestTokenRestServlet(RestServlet):
         send_attempt = body["send_attempt"]
         next_link = body.get("next_link")  # Optional param
 
-        if not check_3pid_allowed(self.hs, "email", email):
+        if not await check_3pid_allowed(self.hs, "email", email):
             raise SynapseError(
                 403,
-                "Your email domain is not authorized to register on this server",
+                "You currently can't create an account with this email address",
                 Codes.THREEPID_DENIED,
             )
 
@@ -190,7 +190,7 @@ class MsisdnRegisterRequestTokenRestServlet(RestServlet):
 
         msisdn = phone_number_to_msisdn(country, phone_number)
 
-        if not check_3pid_allowed(self.hs, "msisdn", msisdn):
+        if not await check_3pid_allowed(self.hs, "msisdn", msisdn):
             raise SynapseError(
                 403,
                 "Phone numbers are not authorized to register on this server",
@@ -514,7 +514,7 @@ class RegisterRestServlet(RestServlet):
                     medium = auth_result[login_type]["medium"]
                     address = auth_result[login_type]["address"]
 
-                    if not check_3pid_allowed(self.hs, medium, address):
+                    if not await check_3pid_allowed(self.hs, medium, address):
                         raise SynapseError(
                             403,
                             "Third party identifiers (email/phone numbers)"

synapse/util/threepids.py

@@ -19,7 +19,7 @@ import re
 logger = logging.getLogger(__name__)
 
 
-def check_3pid_allowed(hs, medium, address):
+async def check_3pid_allowed(hs, medium, address):
     """Checks whether a given format of 3PID is allowed to be used on this HS
 
     Args:
@@ -31,6 +31,32 @@ def check_3pid_allowed(hs, medium, address):
         bool: whether the 3PID medium/address is allowed to be added to this HS
     """
 
+    if hs.config.check_is_for_allowed_local_3pids:
+        data = await hs.get_simple_http_client().get_json(
+            "https://%s%s" % (
+                hs.config.check_is_for_allowed_local_3pids,
+                "/_matrix/identity/api/v1/internal-info"
+            ),
+            {'medium': medium, 'address': address}
+        )
+
+        # Check for invalid response
+        if 'hs' not in data and 'shadow_hs' not in data:
+            return False
+
+        # Check if this user is intended to register for this homeserver
+        if (
+            data.get('hs') != hs.config.server_name
+            and data.get('shadow_hs') != hs.config.server_name
+        ):
+            return False
+
+        if data.get('requires_invite', False) and not data.get('invited', False):
+            # Requires an invite but hasn't been invited
+            return False
+
+        return True
+
     if hs.config.allowed_local_3pids:
         for constraint in hs.config.allowed_local_3pids:
             logger.debug(