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fix(mcp): preserve embedded guest identity during permalink lookup - #45346
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refresh_request_user_for_permalink_access() reloads the request user from the metadata database so a stored user's latest roles apply to permalink access checks. Embedded guest users have no stored account; their identity and restrictions come from the guest token. Return early for guest users, as is already done for anonymous users. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #45346 +/- ##
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+ Coverage 64.93% 83.44% +18.51%
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Files 3040 3042 +2
Lines 198718 199070 +352
Branches 46381 46413 +32
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+ Hits 129033 166119 +37086
+ Misses 66779 29725 -37054
- Partials 2906 3226 +320
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gabotorresruiz
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gabotorresruiz
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Hey @rebenitez1802, thanks for this one. The fix reads right to me and I could not break it: against a real metadata DB I ran a guest minted through create_guest_access_token / parse_jwt_guest_token with and without a username collision, plus an anonymous user and stored Gamma and Admin users, over two permalinks. The colliding guest is the only case that moves, and it moves the way you describe: on the parent commit g.user comes back as the stored User with that account's roles so the guest branch of raise_for_access never runs, while on this branch the GuestUser keeps its resources and rls and still resolves its own dashboard's permalink. Your new test fails on the parent and survived the mutations I tried.
Left one non-blocking note inline. Holding the formal approval only because unit-tests (current) is still pending, happy to flip it once that is green.
| def refresh_request_user_for_permalink_access() -> None: | ||
| """Reload the request user before permalink access checks.""" | ||
| """Reload stored users while preserving token-scoped guest identities.""" | ||
| if not has_request_context() or not getattr(g, "user", None): |
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Not a blocker, and the guard itself looks right to me. Flagging because it is easy to miss: when the MCP service runs on its own (superset mcp run, streamable-http or stdio) a tool call executes under an app context only. _mcp_tool_call_context() pushes app_context() and never a request context, so has_request_context() is False on this line and the helper returns before the anonymous branch or your new guest branch is reached. I confirmed that on a live get_dashboard_info call with a signed guest token.
That does not make the fix wrong, it makes it the right shape for a deployment that pushes a request context around the tool call, which is the g.user fallback get_user_from_request() documents for external middleware. Two small things:
- worth a line in the docstring that the refresh only applies when a request context is present?
- is
has_request_context()the gate you actually want? Under the standalone server a stored user's roles are never refreshed either, which is what this helper exists for. If that ever becomeshas_app_context()the guest guard goes from defensive to load bearing, so landing it first is right either way.
Or am I missing a transport that does push a request context?
| mock_load.assert_called_once_with(username="admin") | ||
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| def test_permalink_lookup_keeps_guest_identity(app: Any) -> None: |
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Just a small NIT: the other three tests in this file take app: Flask, and Any is imported only for this one annotation, so the import on line 20 can go back to cast alone.
| def test_permalink_lookup_keeps_guest_identity(app: Any) -> None: | |
| def test_permalink_lookup_keeps_guest_identity(app: Flask) -> None: |
| if getattr(current_user, "is_anonymous", False) or getattr( | ||
| current_user, "is_guest_user", False | ||
| ): |
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Worth noting for whoever reviews after me: worker.py:704 already carries this exact predicate, guest = user if getattr(user, "is_guest_user", False) else None, and line 726 puts the guest back after re-hydrating g.user by id on a worker thread. So both the spelling and the precedent were already upstream and this helper was the one place missing it. Good argument for the fix living right here.
gabotorresruiz
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Approving, @rebenitez1802. The condition I held on has landed, so this clears from my side.
I could not get a colliding guest past the guard. A guest whose token username matches a stored account keeps its own identity, roles, resources and rls through both get_dashboard_permalink and get_dashboard_permalink_data_mask, and on the parent it resolved a permalink outside its token as that stored account. Stored users and anonymous are byte for byte unchanged. Your new test fails on the real merge base, and both mutations I tried on the guard are caught.
All twelve required checks are green at 12ff232c. The unit-tests (current) matrix job is re-running after an infrastructure cancellation that had nothing to do with this diff.
My two earlier comments stand as context and a nit, neither blocking.
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SUMMARY
refresh_request_user_for_permalink_access()reloads the request user from the metadatadatabase before dashboard permalink access checks, so a stored user's latest roles apply.
Embedded guest users have no stored account: their identity, dashboard resources, dataset
restrictions and row-level security rules come from the guest token. This change returns early
for guest users, as it already does for anonymous users, so permalink lookups keep the
token-scoped guest identity. Stored users are refreshed exactly as before.
BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
N/A (backend only)
TESTING INSTRUCTIONS
The new test resolves a permalink as a
GuestUserand asserts the guest identity and its tokenrestrictions are unchanged and no stored-user reload happens. Existing tests cover stored-user
refresh.
ADDITIONAL INFORMATION
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