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Add config option to hide device names over federation (#9945)

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Now that cross signing exists there is much less of a need for other people to look at devices and verify them individually. This PR adds a config option to allow you to prevent device display names from being shared with other servers.

Signed-off-by: Aaron Raimist <aaron@raim.ist>
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Aaron Raimist 2021-05-11 08:03:23 -05:00 committed by GitHub
parent b378d98c8f
commit dc6366a9bd
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 20 additions and 1 deletions
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1
changelog.d/9945.feature Normal file
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@ -0,0 +1 @@
Add a config option to allow you to prevent device display names from being shared over federation. Contributed by @aaronraimist.

6
docs/sample_config.yaml
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@ -741,6 +741,12 @@ acme:
#
#allow_profile_lookup_over_federation: false
# Uncomment to disable device display name lookup over federation. By default, the
# Federation API allows other homeservers to obtain device display names of any user
# on this homeserver. Defaults to 'true'.
#
#allow_device_name_lookup_over_federation: false
## Caching ##

10
synapse/config/federation.py
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@ -44,6 +44,10 @@ class FederationConfig(Config):
"allow_profile_lookup_over_federation", True
)
self.allow_device_name_lookup_over_federation = config.get(
"allow_device_name_lookup_over_federation", True
)
def generate_config_section(self, config_dir_path, server_name, **kwargs):
return """\
## Federation ##
@ -75,6 +79,12 @@ class FederationConfig(Config):
# on this homeserver. Defaults to 'true'.
#
#allow_profile_lookup_over_federation: false
# Uncomment to disable device display name lookup over federation. By default, the
# Federation API allows other homeservers to obtain device display names of any user
# on this homeserver. Defaults to 'true'.
#
#allow_device_name_lookup_over_federation: false
"""

4
synapse/storage/databases/main/end_to_end_keys.py
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@ -84,7 +84,9 @@ class EndToEndKeyWorkerStore(EndToEndKeyBackgroundStore):
if keys:
result["keys"] = keys
device_display_name = device.display_name
device_display_name = None
if self.hs.config.allow_device_name_lookup_over_federation:
device_display_name = device.display_name
if device_display_name:
result["device_display_name"] = device_display_name