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3 Commits
| Author | SHA1 | Date | |
|---|---|---|---|
| acb9cd67c6 | |||
| d90ab7e646 | |||
| 8ea90adcaf |
@@ -26,7 +26,7 @@ jobs:
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- name: Run pylint
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run: |
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# Run pylint on all Python files in the repo
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find . -name '*.py' -not -path './.venv/*' -not -path './.git/*' | xargs pylint --fail-under=8.0 || true
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find . -name '*.py' -not -path './.venv/*' -not -path './.git/*' | xargs pylint --fail-under=8.0
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- name: Run pyright
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run: |
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@@ -19,8 +19,8 @@ from urllib.parse import urlsplit
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DEFAULT_PORT = 9420
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# Body-size cap matching supervise_server.py's 1 MiB limit.
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MAX_BODY_BYTES = 1 * 1024 * 1024
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# Bound memory use while still allowing ordinary git push packfiles.
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MAX_BODY_BYTES = 100 * 1024 * 1024
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class GitHttpHandler(BaseHTTPRequestHandler):
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@@ -13,13 +13,13 @@ Add Content-Length validation and a body-size cap to `git_http_backend.py` so ma
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`bot_bottle/git_http_backend.py` calls `int(self.headers.get("Content-Length", 0))` without catching `ValueError`. A request with a non-numeric Content-Length raises an unhandled exception in the request handler.
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The handler reads the full declared length into memory before passing the body to `git http-backend` with no upper bound. A local or compromised client can force arbitrarily high memory use. For comparison, `supervise_server.py` caps request bodies at 1 MiB.
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The handler reads the full declared length into memory before passing the body to `git http-backend` with no upper bound. A local or compromised client can force arbitrarily high memory use.
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## Goals / Success Criteria
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- A missing or non-numeric Content-Length returns HTTP 400.
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- A negative Content-Length returns HTTP 400.
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- A body larger than the cap (1 MiB, matching `supervise_server.py`) returns HTTP 413.
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- A body larger than the cap (100 MiB) returns HTTP 413.
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- Valid Git smart-HTTP pushes and fetches continue to work.
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- Unit tests cover: missing length, non-numeric length, negative length, over-cap length, and a valid push/fetch passthrough.
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@@ -43,12 +43,12 @@ Out of scope:
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## Design
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Wrap the Content-Length parse in a try/except and return 400 on `ValueError`. Add an explicit check for negative values. After parsing, compare the declared length against a module-level `MAX_BODY_BYTES` constant (default 1 MiB) and return 413 if exceeded. Read exactly `min(content_length, MAX_BODY_BYTES)` bytes.
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Wrap the Content-Length parse in a try/except and return 400 on `ValueError`. Add an explicit check for negative values. After parsing, compare the declared length against a module-level `MAX_BODY_BYTES` constant (default 100 MiB) and return 413 if exceeded. Read exactly `min(content_length, MAX_BODY_BYTES)` bytes.
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## Testing Strategy
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- Unit tests using `unittest.mock` to drive the handler with crafted headers.
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- Test cases: no Content-Length header, `Content-Length: abc`, `Content-Length: -1`, `Content-Length: 2097152` (over cap), and a normal small POST body.
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- Test cases: no Content-Length header, `Content-Length: abc`, `Content-Length: -1`, a declared length above `MAX_BODY_BYTES`, and a normal small POST body.
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Run:
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@@ -9,7 +9,7 @@ import urllib.request
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from pathlib import Path
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from unittest import mock
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from bot_bottle.git_http_backend import GitHttpHandler
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from bot_bottle.git_http_backend import GitHttpHandler, MAX_BODY_BYTES
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class TestGitHttpBackend(unittest.TestCase):
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@@ -305,9 +305,8 @@ class TestContentLengthBounds(unittest.TestCase):
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self.assertEqual(400, status)
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def test_oversized_content_length_returns_413(self):
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# Declare 2 MiB — over the 1 MiB cap.
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status = self._post("/repo.git/git-receive-pack",
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content_length_header=str(2 * 1024 * 1024))
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content_length_header=str(MAX_BODY_BYTES + 1))
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self.assertEqual(413, status)
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def test_valid_small_body_passes_through(self):
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