MirrorHub/synapse
0
0
Fork 1
mirror of https://mau.dev/maunium/synapse.git synced 2024-12-14 13:43:51 +01:00
Code Issues Projects Releases Wiki Activity

Fix exception when OpenGraph tag values are ints

Browse source
This commit is contained in:
Richard van der Hoff 2019-11-05 17:22:58 +00:00
parent e78167c94b
commit 81d49cbb07
2 changed files with 3 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
changelog.d/6334.feature Normal file
View file

@ -0,0 +1 @@
Limit the length of data returned by url previews, to prevent DoS attacks.

3
synapse/rest/media/v1/preview_url_resource.py
View file

@ -274,7 +274,8 @@ class PreviewUrlResource(DirectServeResource):
# filter out any stupidly long values
keys_to_remove = []
for k, v in og.items():
if len(k) > OG_TAG_NAME_MAXLEN or len(v) > OG_TAG_VALUE_MAXLEN:
# values can be numeric as well as strings, hence the cast to str
if len(k) > OG_TAG_NAME_MAXLEN or len(str(v)) > OG_TAG_VALUE_MAXLEN:
logger.warning(
"Pruning overlong tag %s from OG data", k[:OG_TAG_NAME_MAXLEN]
)