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-rw-r--r--synapse/config/emailconfig.py12
-rw-r--r--synapse/config/logger.py25
-rw-r--r--synapse/config/server.py33
3 files changed, 64 insertions, 6 deletions
diff --git a/synapse/config/emailconfig.py b/synapse/config/emailconfig.py
index 7a796996c0..72b42bfd62 100644
--- a/synapse/config/emailconfig.py
+++ b/synapse/config/emailconfig.py
@@ -228,6 +228,7 @@ class EmailConfig(Config):
                 self.email_registration_template_text,
                 self.email_add_threepid_template_html,
                 self.email_add_threepid_template_text,
+                self.email_password_reset_template_confirmation_html,
                 self.email_password_reset_template_failure_html,
                 self.email_registration_template_failure_html,
                 self.email_add_threepid_template_failure_html,
@@ -242,6 +243,7 @@ class EmailConfig(Config):
                     registration_template_text,
                     add_threepid_template_html,
                     add_threepid_template_text,
+                    "password_reset_confirmation.html",
                     password_reset_template_failure_html,
                     registration_template_failure_html,
                     add_threepid_template_failure_html,
@@ -404,9 +406,13 @@ class EmailConfig(Config):
           # * The contents of password reset emails sent by the homeserver:
           #   'password_reset.html' and 'password_reset.txt'
           #
-          # * HTML pages for success and failure that a user will see when they follow
-          #   the link in the password reset email: 'password_reset_success.html' and
-          #   'password_reset_failure.html'
+          # * An HTML page that a user will see when they follow the link in the password
+          #   reset email. The user will be asked to confirm the action before their
+          #   password is reset: 'password_reset_confirmation.html'
+          #
+          # * HTML pages for success and failure that a user will see when they confirm
+          #   the password reset flow using the page above: 'password_reset_success.html'
+          #   and 'password_reset_failure.html'
           #
           # * The contents of address verification emails sent during registration:
           #   'registration.html' and 'registration.txt'
diff --git a/synapse/config/logger.py b/synapse/config/logger.py
index c96e6ef62a..13d6f6a3ea 100644
--- a/synapse/config/logger.py
+++ b/synapse/config/logger.py
@@ -17,6 +17,7 @@ import logging
 import logging.config
 import os
 import sys
+import threading
 from string import Template
 
 import yaml
@@ -25,6 +26,7 @@ from twisted.logger import (
     ILogObserver,
     LogBeginner,
     STDLibLogObserver,
+    eventAsText,
     globalLogBeginner,
 )
 
@@ -216,8 +218,9 @@ def _setup_stdlib_logging(config, log_config, logBeginner: LogBeginner):
     # system.
     observer = STDLibLogObserver()
 
-    def _log(event):
+    threadlocal = threading.local()
 
+    def _log(event):
         if "log_text" in event:
             if event["log_text"].startswith("DNSDatagramProtocol starting on "):
                 return
@@ -228,7 +231,25 @@ def _setup_stdlib_logging(config, log_config, logBeginner: LogBeginner):
             if event["log_text"].startswith("Timing out client"):
                 return
 
-        return observer(event)
+        # this is a workaround to make sure we don't get stack overflows when the
+        # logging system raises an error which is written to stderr which is redirected
+        # to the logging system, etc.
+        if getattr(threadlocal, "active", False):
+            # write the text of the event, if any, to the *real* stderr (which may
+            # be redirected to /dev/null, but there's not much we can do)
+            try:
+                event_text = eventAsText(event)
+                print("logging during logging: %s" % event_text, file=sys.__stderr__)
+            except Exception:
+                # gah.
+                pass
+            return
+
+        try:
+            threadlocal.active = True
+            return observer(event)
+        finally:
+            threadlocal.active = False
 
     logBeginner.beginLoggingTo([_log], redirectStandardIO=not config.no_redirect_stdio)
     if not config.no_redirect_stdio:
diff --git a/synapse/config/server.py b/synapse/config/server.py
index e85c6a0840..532b910470 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -19,7 +19,7 @@ import logging
 import os.path
 import re
 from textwrap import indent
-from typing import Any, Dict, Iterable, List, Optional
+from typing import Any, Dict, Iterable, List, Optional, Set
 
 import attr
 import yaml
@@ -542,6 +542,19 @@ class ServerConfig(Config):
             users_new_default_push_rules
         )  # type: set
 
+        # Whitelist of domain names that given next_link parameters must have
+        next_link_domain_whitelist = config.get(
+            "next_link_domain_whitelist"
+        )  # type: Optional[List[str]]
+
+        self.next_link_domain_whitelist = None  # type: Optional[Set[str]]
+        if next_link_domain_whitelist is not None:
+            if not isinstance(next_link_domain_whitelist, list):
+                raise ConfigError("'next_link_domain_whitelist' must be a list")
+
+            # Turn the list into a set to improve lookup speed.
+            self.next_link_domain_whitelist = set(next_link_domain_whitelist)
+
     def has_tls_listener(self) -> bool:
         return any(listener.tls for listener in self.listeners)
 
@@ -1014,6 +1027,24 @@ class ServerConfig(Config):
         # act as if no error happened and return a fake session ID ('sid') to clients.
         #
         #request_token_inhibit_3pid_errors: true
+
+        # A list of domains that the domain portion of 'next_link' parameters
+        # must match.
+        #
+        # This parameter is optionally provided by clients while requesting
+        # validation of an email or phone number, and maps to a link that
+        # users will be automatically redirected to after validation
+        # succeeds. Clients can make use this parameter to aid the validation
+        # process.
+        #
+        # The whitelist is applied whether the homeserver or an
+        # identity server is handling validation.
+        #
+        # The default value is no whitelist functionality; all domains are
+        # allowed. Setting this value to an empty list will instead disallow
+        # all domains.
+        #
+        #next_link_domain_whitelist: ["matrix.org"]
         """
             % locals()
         )