Kevin Veen-BirkenbachandClaude Opus 5.5
8e180be256
The council root is writable by every agent, and operator.py runs rasci.database() outside the sandbox. A symlinked rasci.json made it read any JSON file the operator can read and write it back into the council as a regular file; a symlinked rasci.lock made it create files at the link target; a FIFO hung every register call. load() now reads through nofollow.read_text and database() locks and writes through nofollow.locked and nofollow.replace. A register that is no object of task objects, or nested past the recursion limit, exits 2 instead of a traceback. nofollow.open_below also refuses a file with more than one link, so a hard link to a file outside the council is refused like a symlink. 🎯 Fix: 96 % 💥 Break: 3 % 💸 Cost: 99 % ⏱️ Time: 95 % 🛡️ Security: 100 % 🏆 Score: 99 🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 % Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
188 lines
8.0 KiB
Python
188 lines
8.0 KiB
Python
from __future__ import annotations
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import importlib.util
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import os
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import signal
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import stat
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import tempfile
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import time
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import unittest
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from pathlib import Path
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REPO_ROOT = Path(__file__).resolve().parents[1]
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NOFOLLOW = REPO_ROOT / "skills" / "kvb-org-organize" / "scripts" / "nofollow.py"
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def _load():
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spec = importlib.util.spec_from_file_location("nofollow_under_test", NOFOLLOW)
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module = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(module)
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return module
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class TestNofollow(unittest.TestCase):
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@classmethod
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def setUpClass(cls):
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cls.nofollow = _load()
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def setUp(self):
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tmp = tempfile.TemporaryDirectory()
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self.addCleanup(tmp.cleanup)
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self.base = Path(tmp.name)
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self.root = self.base / "council"
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self.root.mkdir(mode=0o700)
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self.victim = self.base / "victim"
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self.victim.write_text("keep", encoding="utf-8")
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self.victims = self.base / "victims"
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self.victims.mkdir()
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def writes(self, root: Path) -> dict:
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nofollow = self.nofollow
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def lock(path: Path) -> None:
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with nofollow.locked(root, path, 0o600, None):
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pass
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return {
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"replace": lambda path: nofollow.replace(root, path, "x", 0o600),
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"append": lambda path: nofollow.append(root, path, "x", 0o600),
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"lock": lock,
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"read": lambda path: nofollow.read_text(root, path),
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"create": lambda path: os.close(
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nofollow.open_below(root, path, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o600)
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),
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}
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def test_writes_land_below_the_root_in_private_directories(self):
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target = self.root / "a" / "b" / "f"
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self.nofollow.replace(self.root, target, "one", 0o600)
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self.nofollow.replace(self.root, target, "two", 0o600)
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self.nofollow.append(self.root, target, "+", 0o600)
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self.assertEqual(target.read_text(encoding="utf-8"), "two+")
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self.assertEqual(sorted(os.listdir(target.parent)), ["f"])
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self.assertEqual(stat.S_IMODE((self.root / "a").stat().st_mode), 0o700)
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self.assertEqual(stat.S_IMODE(target.stat().st_mode), 0o600)
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with self.nofollow.locked(self.root, self.root / "c" / "lock", 0o600, None) as handle:
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handle.write("held")
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self.assertEqual((self.root / "c" / "lock").read_text(encoding="utf-8"), "held")
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with self.nofollow.locked(self.root, self.root / "c" / "lock", 0o600, 1):
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pass
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self.assertEqual((self.root / "c" / "lock").read_text(encoding="utf-8"), "held")
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self.nofollow.unlink(self.root, target)
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self.assertFalse(target.exists())
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def test_replace_swaps_a_planted_link_and_keeps_its_target(self):
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dangling = self.base / "created"
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for target in (self.victim, dangling):
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with self.subTest(target=target.name):
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link = self.root / "f"
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link.symlink_to(target)
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self.nofollow.replace(self.root, link, "x", 0o600)
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self.assertFalse(link.is_symlink())
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self.assertEqual(link.read_text(encoding="utf-8"), "x")
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link.unlink()
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self.assertEqual(self.victim.read_text(encoding="utf-8"), "keep")
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self.assertFalse(dangling.exists())
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def test_a_symlinked_name_is_refused_and_its_target_kept(self):
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dangling = self.base / "created"
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followers = {name: write for name, write in self.writes(self.root).items() if name != "replace"}
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for name, write in followers.items():
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with self.subTest(write=name):
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link = self.root / name
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link.symlink_to(self.victim)
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with self.assertRaises(OSError):
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write(link)
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self.assertEqual(self.victim.read_text(encoding="utf-8"), "keep")
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link.unlink()
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link.symlink_to(dangling)
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with self.assertRaises(OSError):
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write(link)
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self.assertFalse(dangling.exists())
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def test_a_hard_linked_name_is_refused_and_its_target_kept(self):
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followers = {name: write for name, write in self.writes(self.root).items() if name not in ("replace", "create")}
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for name, write in followers.items():
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with self.subTest(write=name):
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link = self.root / name
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os.link(self.victim, link)
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with self.assertRaises(OSError):
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write(link)
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self.assertEqual(self.victim.read_text(encoding="utf-8"), "keep")
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link.unlink()
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def test_a_symlinked_directory_is_refused_and_nothing_lands_in_its_target(self):
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(self.root / "d").symlink_to(self.victims)
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(self.victims / "f").write_text("keep", encoding="utf-8")
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for name, write in self.writes(self.root).items():
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with self.subTest(write=name):
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with self.assertRaises(OSError):
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write(self.root / "d" / name)
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with self.assertRaises(OSError):
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write(self.root / "d" / "deeper" / name)
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with self.assertRaises(OSError):
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self.nofollow.unlink(self.root, self.root / "d" / "f")
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self.assertEqual(os.listdir(self.victims), ["f"])
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self.assertEqual((self.victims / "f").read_text(encoding="utf-8"), "keep")
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def test_a_symlinked_root_is_refused(self):
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link = self.base / "link"
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link.symlink_to(self.victims)
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for name, write in self.writes(link).items():
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with self.subTest(write=name), self.assertRaises(OSError):
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write(link / name)
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self.assertEqual(os.listdir(self.victims), [])
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def test_a_path_outside_the_root_is_refused(self):
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escaped = self.base / "escaped"
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for path in (self.root / ".." / "escaped", self.root / "a" / ".." / ".." / "escaped", escaped, self.root):
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for name, write in self.writes(self.root).items():
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with self.subTest(path=str(path), write=name), self.assertRaises(OSError):
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write(path)
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self.assertFalse(escaped.exists())
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self.assertFalse((self.root / "a").exists())
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def test_a_fifo_at_a_name_is_refused_without_blocking(self):
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def blocked(*_: object) -> None:
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raise AssertionError("blocked on a FIFO")
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previous = signal.signal(signal.SIGALRM, blocked)
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self.addCleanup(signal.signal, signal.SIGALRM, previous)
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self.addCleanup(signal.alarm, 0)
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followers = {name: access for name, access in self.writes(self.root).items() if name != "replace"}
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for name, access in followers.items():
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with self.subTest(access=name):
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fifo = self.root / name
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os.mkfifo(fifo, 0o600)
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signal.alarm(5)
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with self.assertRaises(OSError):
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access(fifo)
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signal.alarm(0)
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def test_a_held_lock_times_out_instead_of_hanging(self):
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path = self.root / "lock"
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with self.nofollow.locked(self.root, path, 0o600, None):
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start = time.monotonic()
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with self.assertRaises(TimeoutError), self.nofollow.locked(self.root, path, 0o600, 0.2):
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pass
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self.assertLess(time.monotonic() - start, 5)
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def test_read_refuses_a_file_over_the_limit_and_replaces_undecodable_bytes(self):
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self.addCleanup(setattr, self.nofollow, "READ_LIMIT", self.nofollow.READ_LIMIT)
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self.nofollow.READ_LIMIT = 4
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(self.root / "f").write_bytes(b"\xff\n")
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self.assertEqual(self.nofollow.read_text(self.root, self.root / "f"), "�\n")
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(self.root / "f").write_bytes(b"12345")
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with self.assertRaises(OSError):
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self.nofollow.read_text(self.root, self.root / "f")
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def test_unlink_removes_a_planted_link_and_keeps_its_target(self):
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(self.root / "l").symlink_to(self.victim)
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self.nofollow.unlink(self.root, self.root / "l")
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self.assertFalse((self.root / "l").is_symlink())
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self.assertEqual(self.victim.read_text(encoding="utf-8"), "keep")
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if __name__ == "__main__":
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unittest.main()
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