feat(hooks): block recursive rm on non-generated directories - #72
feat(hooks): block recursive rm on non-generated directories#72mark-brannan wants to merge 2 commits into
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Adds no-rm-tree.sh, a PreToolUse gate on Bash that denies any recursive rm (-r/-R/--recursive, or a short cluster containing r/R) unless every target resolves to the session scratchpad, an agent worktree, /tmp, or a directory named in its GENERATED_NAMES list. Everything else in $HOME is denied by default, including public/ and repo working trees. Wires the hook into settings.json and cloud-session-setup.sh's INSTALL list. 34/34 tests pass (no-rm-tree.test.sh). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughChangesRecursive removal guard
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to Common quoted paths, escaped command words, symlinked paths, or hook failures can bypass the new removal guard and permit deletion of repository or user data. These paths should be fixed before merge. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant ClaudeBash
participant NoRmTreeHook
participant JqAwk
participant Filesystem
ClaudeBash->>NoRmTreeHook: Send Bash tool payload
NoRmTreeHook->>JqAwk: Extract command and analyze recursive rm
JqAwk->>NoRmTreeHook: Return parsed targets
NoRmTreeHook->>Filesystem: Compare resolved targets with allowed paths
NoRmTreeHook-->>ClaudeBash: Return allow or deny decision
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 3 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Claude finished @mark-brannan's task in 4m 41s —— View job Review complete
SummaryWiring is correct: hook registered in One correctness bug, posted inline on Nothing else stood out — no secrets/permissions/remote-execution concerns, and the rest of the allowlist logic (glob/ |
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Actionable comments posted: 4
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Inline comments:
In @.claude/hooks/no-rm-tree.sh:
- Around line 160-161: Update the command normalization logic in the hook so
quoted rm operands are parsed as their actual shell arguments instead of being
replaced with Q; if quoted shell fragments cannot be safely validated, deny
them. Ensure validation cannot authorize a path such as /tmp/Q when the command
targets a different quoted path, and add regression coverage for quoted paths
and sh -c commands.
- Line 169: Update the command-word detection in the awk logic around the rm
match to account for shell-escaped command names, ensuring r\m resolves to and
is rejected as rm before recursive-target checks are skipped. Add a regression
case covering r\m -rf examples.
- Line 198: Update the path validation around badflag and the under checks in
no-rm-tree.sh to resolve existing path components, including intermediate
symlinks, before comparing against approved roots; deny any resolved target
outside /tmp, scratch, worktrees, or generated paths, and add a regression test
covering a symlinked /tmp escape path.
In @.claude/settings.json:
- Line 120: Update the PreToolUse command for no-rm-tree.sh to fail closed: when
the hook is missing or exits unsuccessfully, emit an explicit deny decision
instead of masking the failure with || true. Preserve the existing hook
execution and allow its successful decision to proceed.
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Configuration used: Path: .coderabbit.yaml
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📒 Files selected for processing (4)
.claude/hooks/no-rm-tree.sh.claude/hooks/no-rm-tree.test.sh.claude/settings.json.local/bin/cloud-session-setup.sh
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Review on #72 found four bypasses in no-rm-tree.sh and one in its wiring. All are fixed, and the same parser was in no-git-footguns.sh, so it is fixed there too rather than twice. lib-shell-words.awk is the one scanner both gates now load. It is a real character scanner rather than regex passes: quotes are removed and escapes applied (r\m and \rm are rm), redirections and their operands vanish (2>&1 is no longer an rm target -- that false positive fired during this session), comments drop, a lone { } separates while a glued one stays in the word so brace expansion is refused, and the body of a quoted string with whitespace is scanned as nested text (sh -c '...', eval, xargs sh -c, python -c "os.system('...')") by command position. A quoted string handed to a prose consumer (grep, echo, printf, git, gh ...) is left alone unless some segment of the command is a shell (echo "..." | sh). no-rm-tree.sh: rm counts wherever it stands in a segment (find -exec, xargs, do, time, an unknown wrapper) unless it is git's/yadm's subcommand; a recursive rm with no visible target is denied, which is what find -exec and brace lists become; a relative target after any cd is denied; a generated name directly under $HOME is Mark's, not build output; and the path is resolved through the filesystem (readlink -f / realpath) so a symlink under /tmp into a repo is denied -- rm follows a trailing slash. find ... -delete is checked the same way. Deny reasons name what was seen. no-git-footguns.sh gains the same reach and a structural reset --hard check as defence in depth behind the regex hook. settings.json: the four gate entries no longer end in || true. A missing or crashing gate now prints a deny naming the hook, so a seed gap blocks loudly instead of passing silently. Convenience hooks keep || true. CI: hook-tests.yml runs every .claude/hooks/*.test.sh under mawk, gawk and original-awk (nothing ran them before); hook-seed-check.yml also requires the libraries hooks load to be in INSTALL. 98 + 118 + 20 tests pass under all three awks locally; hook latency measured at 10-30 ms. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Claude finished @mark-brannan's task in 3m 54s —— View job Review complete (commit 05ca4b1)
SummaryThis push is a substantial rewrite that directly addresses every finding from the prior review round (mine and CodeRabbit's four):
Also new: Caveat on this pass: the three new files ( Nothing else stood out — no new secrets/permissions/remote-execution concerns, and no regressions found in the |
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@coderabbitai review |
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1 participant
Session 97b9f69d ran
rm -rf examplesin signalk-noaa-space-weather whilerepointing a plugin at the core, and destroyed ~20 untracked aurora
captures,
examples/captures/, and a watch log Mark was using as anongoing download area —
git rm --cachedhad already handled the trackedfiles, so the
rm -rfonly needed to sweep the rest, and the rest was his.no-rm-tree.shis an allowlist, not a denylist: recursivermpasses onlywhen every target resolves (against the payload's
cwd) to the scratchpad,an agent worktree,
/tmp, or a directory named inGENERATED_NAMES.Everything else in
$HOMEis denied by default. The hook fails closed —no jq/awk means deny.
Wired into
settings.jsonandcloud-session-setup.sh'sINSTALLlist.34/34 tests pass (
.claude/hooks/no-rm-tree.test.sh).🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Tests