fix(skills): validate skill_id path segments before GCS blob lookup - #6689
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@wukath, is there anything needed from my side to merge this PR? |
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Hi @wukath , is there any update require from my side on this ? |
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Hi @wukath, |
_load_skill_from_gcs_dir builds the GCS blob prefix it looks up
(SKILL.md and resource files) by directly interpolating the caller
-supplied skill_id: f"{base_prefix}{skill_id}/". skill_id identifies
which of potentially many skill directories under a shared bucket gets
loaded, so an application may resolve it from a caller- or
model-selected skill name rather than a fixed, developer-authored
constant.
Validates each '/'-separated segment of skill_id the same way
app_name/eval_set_id/eval_set_result_id are validated in
GcsEvalSetsManager and GcsEvalSetResultsManager (rejecting empty
segments, null bytes, backslashes, and '.'/'..' traversal segments)
before it reaches the blob-name f-string, applying the same defense
already present in gcs_artifact_service.py to this sibling code path.
Adds regression tests covering traversal-shaped skill_id values,
confirming they are rejected before any blob lookup occurs. Full
tests/unittests/skills/ suite (78 tests) passes unchanged.
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_load_skill_from_gcs_dir builds the GCS blob prefix it looks up (SKILL.md and resource files) by directly interpolating the caller -supplied skill_id: f"{base_prefix}{skill_id}/". skill_id identifies which of potentially many skill directories under a shared bucket gets loaded, so an application may resolve it from a caller- or model-selected skill name rather than a fixed, developer-authored constant.
Validates each '/'-separated segment of skill_id the same way app_name/eval_set_id/eval_set_result_id are validated in GcsEvalSetsManager and GcsEvalSetResultsManager (rejecting empty segments, null bytes, backslashes, and '.'/'..' traversal segments) before it reaches the blob-name f-string, applying the same defense already present in gcs_artifact_service.py to this sibling code path.
Adds regression tests covering traversal-shaped skill_id values, confirming they are rejected before any blob lookup occurs. Full tests/unittests/skills/ suite (78 tests) passes unchanged.