Allow users to click account renewal links multiple times without hit…

…ting an 'Invalid Token' page (#74)

docs/sample_config.yaml

@@ -1192,69 +1192,6 @@ url_preview_accept_language:
 #
 #enable_registration: false
 
-# Optional account validity configuration. This allows for accounts to be denied
-# any request after a given period.
-#
-# Once this feature is enabled, Synapse will look for registered users without an
-# expiration date at startup and will add one to every account it found using the
-# current settings at that time.
-# This means that, if a validity period is set, and Synapse is restarted (it will
-# then derive an expiration date from the current validity period), and some time
-# after that the validity period changes and Synapse is restarted, the users'
-# expiration dates won't be updated unless their account is manually renewed. This
-# date will be randomly selected within a range [now + period - d ; now + period],
-# where d is equal to 10% of the validity period.
-#
-account_validity:
-  # The account validity feature is disabled by default. Uncomment the
-  # following line to enable it.
-  #
-  #enabled: true
-
-  # The period after which an account is valid after its registration. When
-  # renewing the account, its validity period will be extended by this amount
-  # of time. This parameter is required when using the account validity
-  # feature.
-  #
-  #period: 6w
-
-  # The amount of time before an account's expiry date at which Synapse will
-  # send an email to the account's email address with a renewal link. By
-  # default, no such emails are sent.
-  #
-  # If you enable this setting, you will also need to fill out the 'email' and
-  # 'public_baseurl' configuration sections.
-  #
-  #renew_at: 1w
-
-  # The subject of the email sent out with the renewal link. '%(app)s' can be
-  # used as a placeholder for the 'app_name' parameter from the 'email'
-  # section.
-  #
-  # Note that the placeholder must be written '%(app)s', including the
-  # trailing 's'.
-  #
-  # If this is not set, a default value is used.
-  #
-  #renew_email_subject: "Renew your %(app)s account"
-
-  # Directory in which Synapse will try to find templates for the HTML files to
-  # serve to the user when trying to renew an account. If not set, default
-  # templates from within the Synapse package will be used.
-  #
-  #template_dir: "res/templates"
-
-  # File within 'template_dir' giving the HTML to be displayed to the user after
-  # they successfully renewed their account. If not set, default text is used.
-  #
-  #account_renewed_html_path: "account_renewed.html"
-
-  # File within 'template_dir' giving the HTML to be displayed when the user
-  # tries to renew an account with an invalid renewal token. If not set,
-  # default text is used.
-  #
-  #invalid_token_html_path: "invalid_token.html"
-
 # Time that a user's session remains valid for, after they log in.
 #
 # Note that this is not currently compatible with guest logins.
@@ -1523,6 +1460,72 @@ account_threepid_delegates:
 #bind_new_user_emails_to_sydent: https://example.com:8091
 
 
+## Account Validity ##
+#
+# Optional account validity configuration. This allows for accounts to be denied
+# any request after a given period.
+#
+# Once this feature is enabled, Synapse will look for registered users without an
+# expiration date at startup and will add one to every account it found using the
+# current settings at that time.
+# This means that, if a validity period is set, and Synapse is restarted (it will
+# then derive an expiration date from the current validity period), and some time
+# after that the validity period changes and Synapse is restarted, the users'
+# expiration dates won't be updated unless their account is manually renewed. This
+# date will be randomly selected within a range [now + period - d ; now + period],
+# where d is equal to 10% of the validity period.
+#
+account_validity:
+  # The account validity feature is disabled by default. Uncomment the
+  # following line to enable it.
+  #
+  #enabled: true
+
+  # The period after which an account is valid after its registration. When
+  # renewing the account, its validity period will be extended by this amount
+  # of time. This parameter is required when using the account validity
+  # feature.
+  #
+  #period: 6w
+
+  # The amount of time before an account's expiry date at which Synapse will
+  # send an email to the account's email address with a renewal link. By
+  # default, no such emails are sent.
+  #
+  # If you enable this setting, you will also need to fill out the 'email' and
+  # 'public_baseurl' configuration sections.
+  #
+  #renew_at: 1w
+
+  # The subject of the email sent out with the renewal link. '%(app)s' can be
+  # used as a placeholder for the 'app_name' parameter from the 'email'
+  # section.
+  #
+  # Note that the placeholder must be written '%(app)s', including the
+  # trailing 's'.
+  #
+  # If this is not set, a default value is used.
+  #
+  #renew_email_subject: "Renew your %(app)s account"
+
+  # Directory in which Synapse will try to find templates for the HTML files to
+  # serve to the user when trying to renew an account. If not set, default
+  # templates from within the Synapse package will be used.
+  #
+  #template_dir: "res/templates"
+
+  # File within 'template_dir' giving the HTML to be displayed to the user after
+  # they successfully renewed their account. If not set, default text is used.
+  #
+  #account_renewed_html_path: "account_renewed.html"
+
+  # File within 'template_dir' giving the HTML to be displayed when the user
+  # tries to renew an account with an invalid renewal token. If not set,
+  # default text is used.
+  #
+  #invalid_token_html_path: "invalid_token.html"
+
+
 ## Metrics ###
 
 # Enable collection and rendering of performance metrics

synapse/api/auth.py

@@ -75,7 +75,7 @@ def __init__(self, hs):
 
         self._auth_blocking = AuthBlocking(self.hs)
 
-        self._account_validity = hs.config.account_validity
+        self._account_validity_enabled = hs.config.account_validity_enabled
         self._track_appservice_user_ips = hs.config.track_appservice_user_ips
         self._macaroon_secret_key = hs.config.macaroon_secret_key
 
@@ -216,7 +216,7 @@ async def get_user_by_req(
             shadow_banned = user_info["shadow_banned"]
 
             # Deny the request if the user account has expired.
-            if self._account_validity.enabled and not allow_expired:
+            if self._account_validity_enabled and not allow_expired:
                 user_id = user.to_string()
                 if await self.store.is_account_expired(user_id, self.clock.time_msec()):
                     raise AuthError(

synapse/config/_base.pyi

@@ -1,6 +1,7 @@
 from typing import Any, List, Optional
 
 from synapse.config import (
+    account_validity,
     api,
     appservice,
     captcha,
@@ -53,6 +54,7 @@ class RootConfig:
     captcha: captcha.CaptchaConfig
     voip: voip.VoipConfig
     registration: registration.RegistrationConfig
+    account_validity: account_validity.AccountValidityConfig
     metrics: metrics.MetricsConfig
     api: api.ApiConfig
     appservice: appservice.AppServiceConfig

synapse/config/account_validity.py

@@ -0,0 +1,146 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from synapse.config._base import Config, ConfigError
+
+
+class AccountValidityConfig(Config):
+    section = "account_validity"
+
+    def read_config(self, config, **kwargs):
+        account_validity_config = config.get("account_validity") or {}
+        self.account_validity_enabled = account_validity_config.get("enabled", False)
+        self.account_validity_renew_by_email_enabled = (
+            "renew_at" in account_validity_config
+        )
+
+        if self.account_validity_enabled:
+            if "period" in account_validity_config:
+                self.account_validity_period = self.parse_duration(
+                    account_validity_config["period"]
+                )
+            else:
+                raise ConfigError("'period' is required when using account validity")
+
+            if "renew_at" in account_validity_config:
+                self.account_validity_renew_at = self.parse_duration(
+                    account_validity_config["renew_at"]
+                )
+
+            if "renew_email_subject" in account_validity_config:
+                self.account_validity_renew_email_subject = account_validity_config[
+                    "renew_email_subject"
+                ]
+            else:
+                self.account_validity_renew_email_subject = "Renew your %(app)s account"
+
+            self.account_validity_startup_job_max_delta = (
+                self.account_validity_period * 10.0 / 100.0
+            )
+
+        if self.account_validity_renew_by_email_enabled:
+            if not self.public_baseurl:
+                raise ConfigError("Can't send renewal emails without 'public_baseurl'")
+
+        # Load account validity templates.
+        # We do this here instead of in AccountValidityConfig as read_templates
+        # relies on state that hasn't been initialised in AccountValidityConfig
+        account_renewed_template_filename = account_validity_config.get(
+            "account_renewed_html_path", "account_renewed.html"
+        )
+        account_previously_renewed_template_filename = account_validity_config.get(
+            "account_previously_renewed_html_path", "account_previously_renewed.html"
+        )
+        invalid_token_template_filename = account_validity_config.get(
+            "invalid_token_html_path", "invalid_token.html"
+        )
+        (
+            self.account_validity_account_renewed_template,
+            self.account_validity_account_previously_renewed_template,
+            self.account_validity_invalid_token_template,
+        ) = self.read_templates(
+            [
+                account_renewed_template_filename,
+                account_previously_renewed_template_filename,
+                invalid_token_template_filename,
+            ]
+        )
+
+    def generate_config_section(self, **kwargs):
+        return """\
+        ## Account Validity ##
+        #
+        # Optional account validity configuration. This allows for accounts to be denied
+        # any request after a given period.
+        #
+        # Once this feature is enabled, Synapse will look for registered users without an
+        # expiration date at startup and will add one to every account it found using the
+        # current settings at that time.
+        # This means that, if a validity period is set, and Synapse is restarted (it will
+        # then derive an expiration date from the current validity period), and some time
+        # after that the validity period changes and Synapse is restarted, the users'
+        # expiration dates won't be updated unless their account is manually renewed. This
+        # date will be randomly selected within a range [now + period - d ; now + period],
+        # where d is equal to 10% of the validity period.
+        #
+        account_validity:
+          # The account validity feature is disabled by default. Uncomment the
+          # following line to enable it.
+          #
+          #enabled: true
+
+          # The period after which an account is valid after its registration. When
+          # renewing the account, its validity period will be extended by this amount
+          # of time. This parameter is required when using the account validity
+          # feature.
+          #
+          #period: 6w
+
+          # The amount of time before an account's expiry date at which Synapse will
+          # send an email to the account's email address with a renewal link. By
+          # default, no such emails are sent.
+          #
+          # If you enable this setting, you will also need to fill out the 'email' and
+          # 'public_baseurl' configuration sections.
+          #
+          #renew_at: 1w
+
+          # The subject of the email sent out with the renewal link. '%(app)s' can be
+          # used as a placeholder for the 'app_name' parameter from the 'email'
+          # section.
+          #
+          # Note that the placeholder must be written '%(app)s', including the
+          # trailing 's'.
+          #
+          # If this is not set, a default value is used.
+          #
+          #renew_email_subject: "Renew your %(app)s account"
+
+          # Directory in which Synapse will try to find templates for the HTML files to
+          # serve to the user when trying to renew an account. If not set, default
+          # templates from within the Synapse package will be used.
+          #
+          #template_dir: "res/templates"
+
+          # File within 'template_dir' giving the HTML to be displayed to the user after
+          # they successfully renewed their account. If not set, default text is used.
+          #
+          #account_renewed_html_path: "account_renewed.html"
+
+          # File within 'template_dir' giving the HTML to be displayed when the user
+          # tries to renew an account with an invalid renewal token. If not set,
+          # default text is used.
+          #
+          #invalid_token_html_path: "invalid_token.html"
+        """

synapse/config/emailconfig.py

@@ -299,7 +299,7 @@ def read_config(self, config, **kwargs):
                 "client_base_url", email_config.get("riot_base_url", None)
             )
 
-        if self.account_validity.renew_by_email_enabled:
+        if self.account_validity_renew_by_email_enabled:
             expiry_template_html = email_config.get(
                 "expiry_template_html", "notice_expiry.html"
             )

synapse/config/homeserver.py

@@ -13,8 +13,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 from ._base import RootConfig
+from .account_validity import AccountValidityConfig
 from .api import ApiConfig
 from .appservice import AppServiceConfig
 from .cache import CacheConfig
@@ -67,6 +67,7 @@ class HomeServerConfig(RootConfig):
         CaptchaConfig,
         VoipConfig,
         RegistrationConfig,
+        AccountValidityConfig,
         MetricsConfig,
         ApiConfig,
         AppServiceConfig,