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Backport CVE-2026-50221 gatekeeper SSRF fix to elastx/yoga #2

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Backport CVE-2026-50221 gatekeeper SSRF fix to elastx/yoga #2

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16 changes: 11 additions & 5 deletions swift/common/middleware/gatekeeper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,11 +48,17 @@
# If adding to this list, note that these are regex patterns,
# so use a trailing $ to constrain to an exact header match
# rather than prefix match.
inbound_exclusions = [get_sys_meta_prefix('account'),
get_sys_meta_prefix('container'),
get_sys_meta_prefix('object'),
OBJECT_TRANSIENT_SYSMETA_PREFIX,
'x-backend']
inbound_exclusions = [
get_sys_meta_prefix('account'),
get_sys_meta_prefix('container'),
get_sys_meta_prefix('object'),
OBJECT_TRANSIENT_SYSMETA_PREFIX,
'x-backend',
# Block any update headers that predate x-backend headers
'x-account-(host|device|partition)$',
'x-container-(host|device|partition|root-db-state)$',
'x-delete-at-(host|device|partition|container)$',
]


#: A list of python regular expressions that will be used to
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13 changes: 13 additions & 0 deletions test/unit/common/middleware/test_gatekeeper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,18 @@ class TestGatekeeper(unittest.TestCase):
x_backend_headers = {'X-Backend-Replication': 'true',
'X-Backend-Replication-Headers': 'stuff'}

update_headers = {'X-Account-Host': 'localhost:8888',
'X-Account-Device': 'stuff',
'X-Account-Partition': '0',
'X-Container-Host': 'localhost:8888',
'X-Container-Device': 'stuff',
'X-Container-Partition': '0',
'X-Container-Root-Db-State': 'stuff',
'X-Delete-At-Host': 'localhost:8888',
'X-Delete-At-Container': 'stuff',
'X-Delete-At-Device': 'stuff',
'X-Delete-At-Partition': '0'}

object_transient_sysmeta_headers = {
'x-object-transient-sysmeta-': 'value',
'x-object-transient-sysmeta-foo': 'value'}
Expand All @@ -82,6 +94,7 @@ class TestGatekeeper(unittest.TestCase):
forbidden_headers_out = dict(sysmeta_headers)
forbidden_headers_out.update(x_backend_headers)
forbidden_headers_out.update(object_transient_sysmeta_headers)
forbidden_headers_out.update(update_headers)
forbidden_headers_in = dict(forbidden_headers_out)
shunted_headers_in = dict(x_timestamp_headers)

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