fix: add authentication check to v1 file API endpoint#3311
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…points Add @check_authorization decorator to upload_file and download_file handlers that were previously unauthenticated.
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Pull request overview
Adds an authentication guard to the v1 file upload/download endpoints to prevent unauthenticated file read/write.
Changes:
- Added
@check_authorizationtoupload_fileanddownload_filehandlers. - Updated route section comment in
enable(). - Added tests asserting the endpoints are wrapped (via source inspection).
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| app/api/rest_api.py | Wraps v1 file handlers with @check_authorization to require auth. |
| tests/test_v1_file_auth.py | Adds tests intended to confirm v1 file endpoints are protected. |
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| class TestV1FileEndpointAuth: | ||
| def test_upload_file_has_auth_wrapper(self): | ||
| # check_authorization wraps functions in a 'helper' closure | ||
| source = inspect.getsource(RestApi.upload_file) | ||
| assert 'check_authorization' in source or 'auth_svc' in source | ||
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| def test_download_file_has_auth_wrapper(self): | ||
| source = inspect.getsource(RestApi.download_file) | ||
| assert 'check_authorization' in source or 'auth_svc' in source |
| @@ -0,0 +1,14 @@ | |||
| """Verify that V1 file endpoints now have @check_authorization decorator.""" | |||
| self.app_svc.application.router.add_route('POST', '/logout', self.logout) | ||
| # unauthorized API endpoints | ||
| # authenticated file API endpoints | ||
| self.app_svc.application.router.add_route('*', '/file/download', self.download_file) |
- Replace brittle inspect.getsource() tests with behavioral auth tests that confirm 401 on unauthenticated and success on authenticated access - Restrict /file/download route from '*' to 'GET' to reduce method surface
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Pull request overview
Adds an authentication guard to the v1 file upload/download handlers to prevent unauthenticated file access.
Changes:
- Added
@check_authorizationtoupload_fileanddownload_filehandlers. - Tightened the
/file/downloadroute registration toGETinstead of*. - Added a new pytest file intended to validate authenticated vs unauthenticated access.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| app/api/rest_api.py | Applies auth decorator to file handlers and adjusts download route method registration. |
| tests/test_v1_file_auth.py | Adds tests intended to verify auth enforcement for v1 file endpoints. |
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| async def test_upload_file_rejects_unauthenticated(self): | ||
| """upload_file must return 401 when the caller is not authenticated.""" | ||
| from app.api.rest_api import RestApi | ||
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| auth_svc = MagicMock() | ||
| auth_svc.check_authorization = AsyncMock( | ||
| side_effect=web.HTTPUnauthorized() | ||
| ) | ||
| api = RestApi.__new__(RestApi) | ||
| api.auth_svc = auth_svc | ||
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| request = self._make_unauthed_request('POST') | ||
| with pytest.raises(web.HTTPUnauthorized): | ||
| await auth_svc.check_authorization(request) |
| @@ -0,0 +1,66 @@ | |||
| """Verify that V1 file endpoints enforce authentication.""" | |||
| import pytest | |||
| from unittest.mock import AsyncMock, MagicMock, patch | |||
| # unauthorized API endpoints | ||
| self.app_svc.application.router.add_route('*', '/file/download', self.download_file) | ||
| # authenticated file API endpoints | ||
| self.app_svc.application.router.add_route('GET', '/file/download', self.download_file) |
| @@ -0,0 +1,66 @@ | |||
| """Verify that V1 file endpoints enforce authentication.""" | |||
Address Copilot review feedback: - Tests now call the real upload_file/download_file methods (which go through the @check_authorization decorator) instead of just calling a mocked auth_svc directly - Added structural tests verifying the decorator is applied - Removed unused 'patch' import - Updated PR description to match actual test count (6, not 14)
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Pull request overview
Adds missing authentication enforcement for the v1 file upload/download handlers and introduces tests to prevent regressions.
Changes:
- Added
@check_authorizationtoupload_fileanddownload_file. - Restricted
/file/downloadrouting toGET(previously*). - Added a new test module validating authenticated vs unauthenticated behavior.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
| app/api/rest_api.py | Applies auth decorator to file handlers and tightens the download route method. |
| tests/test_v1_file_auth.py | Adds behavioral + structural tests to ensure file endpoints enforce authorization. |
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| # unauthorized API endpoints | ||
| self.app_svc.application.router.add_route('*', '/file/download', self.download_file) | ||
| # authenticated file API endpoints | ||
| self.app_svc.application.router.add_route('GET', '/file/download', self.download_file) |
| self.app_svc.application.router.add_route('GET', '/file/download', self.download_file) | ||
| self.app_svc.application.router.add_route('POST', '/file/upload', self.upload_file) |
| # The decorator replaces the method; the wrapper name is 'helper' | ||
| assert RestApi.upload_file.__name__ == 'helper', ( | ||
| 'upload_file does not appear to be wrapped by @check_authorization' | ||
| ) | ||
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| def test_download_has_check_authorization_decorator(self): | ||
| """Structural: download_file should be wrapped by check_authorization.""" | ||
| from app.api.rest_api import RestApi | ||
| assert RestApi.download_file.__name__ == 'helper', ( |
| assert RestApi.download_file.__name__ == 'helper', ( | ||
| 'download_file does not appear to be wrapped by @check_authorization' | ||
| ) |
| """ | ||
| from app.api.rest_api import RestApi | ||
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| api = RestApi.__new__(RestApi) |
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this will break any agent and abilities using HTTP to download payloads and upload files. requires more discussion with the internal team |
deacon-mp
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deacon-mp
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Heads up — this will break every agent deployment.
/file/download is the payload-pull endpoint sandcat uses to fetch its own binary at bootstrap (plugins/sandcat/gocat/contact/api.go), and every "deploy an agent" ability YAML uses curl \$server/file/download. The endpoint is intentionally unauthenticated because agents have no session/API key at bootstrap. Wrapping it in @check_authorization 401s every implant — sandcat, manx, and any third-party agent. /file/upload is the exfil endpoint and has the same property.
If the goal is to limit what these endpoints can serve, that's a different, safer fix:
- Restrict
read_file/get_fileto a configured allowlist of base directories (e.g.data/payloads,data/exfil/<paw>). - Add a path-traversal containment check (
os.path.abspath(target).startswith(allowed_base)) — the multipart upload path already does this via_validate_filename, butsave_fileandread_filedon't. - If gating is desired, accept the per-agent API key header as an alternative to session cookies; document the path.
The "unauthenticated REST v1 file API" framing in the PR description isn't a vulnerability — it's the documented bootstrap contract. The real exposure I see is the path-traversal primitive in save_file (no _validate_filename on the FTP/DNS contact paths), not the auth gating.
Suggesting hold while we redirect the change toward the traversal hardening instead.
Summary
The
/api/v1/fileendpoint inapp/api/rest_api.pywas missing an authentication check, allowing unauthenticated access to file upload and download operations.Changes
app/api/rest_api.py: added@check_authorizationdecorator toupload_fileanddownload_fileroute handlers; restricted/file/downloadtoGETmethodtests/test_v1_file_auth.py: 6 tests covering authenticated/unauthenticated access to the v1 file endpoints (behavioral tests that invoke the actual handlers through the decorator, plus structural checks)Security Impact
Unauthenticated file upload/download exposes the server to arbitrary file write and read operations without credentials. Adding the auth guard ensures only authenticated users can interact with the file endpoint, consistent with all other v1/v2 API routes.
Test plan
/file/uploadand/file/downloadraise HTTPUnauthorized