Only assert valid next_link params when provided (#8417)

Broken in https://github.com/matrix-org/synapse/pull/8275 and has yet to be put in a release. Fixes https://github.com/matrix-org/synapse/issues/8418.

`next_link` is an optional parameter. However, we were checking whether the `next_link` param was valid, even if it wasn't provided. In that case, `next_link` was `None`, which would clearly not be a valid URL.

This would prevent password reset and other operations if `next_link` was not provided, and the `next_link_domain_whitelist` config option was set.
This commit is contained in:
Andrew Morgan 2020-09-29 12:36:44 +01:00 committed by GitHub
parent 866c84da8d
commit 1c6b8752b8
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3 changed files with 16 additions and 6 deletions

1
changelog.d/8417.feature Normal file
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@ -0,0 +1 @@
Add a config option to specify a whitelist of domains that a user can be redirected to after validating their email or phone number.

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@ -103,8 +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)
if next_link:
# 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
@ -379,8 +380,9 @@ class EmailThreepidRequestTokenRestServlet(RestServlet):
Codes.THREEPID_DENIED,
)
# Raise if the provided next_link value isn't valid
assert_valid_next_link(self.hs, next_link)
if next_link:
# 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)
@ -453,8 +455,9 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
Codes.THREEPID_DENIED,
)
# Raise if the provided next_link value isn't valid
assert_valid_next_link(self.hs, next_link)
if next_link:
# 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)

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@ -732,6 +732,12 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
@override_config({"next_link_domain_whitelist": ["example.com", "example.org"]})
def test_next_link_domain_whitelist(self):
"""Tests next_link parameters must fit the whitelist if provided"""
# Ensure not providing a next_link parameter still works
self._request_token(
"something@example.com", "some_secret", next_link=None, expect_code=200,
)
self._request_token(
"something@example.com",
"some_secret",