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fix(rules): close five gaps Codex found in #947 after it merged - #950
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- WH013: `continue-on-error: true` counts as a mask only on the step that performs the write. A flag on a sibling step no longer marks another step's unmasked push as masked. - WH013: a `steps: # comment` key is recognised. - WH013: both masked findings now name `continue-on-error: true` in their reason and fix, instead of only the shell masks. - Job extraction: a comment between jobs is no longer appended to the job above it. A comment such as `# used to git push origin main` was read as a write. - RE005: a double-quoted trap handler may contain escaped quotes (`trap "kill \"$PID\" || true" EXIT`). Tests: 5 new cases; 114/114 pass, and 4 fail against main. The full WorkflowHardening scan and RE005 report the same findings on hypatia, standards and echidna before and after. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM
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Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly identifies a rule fix and the five gaps addressed after PR #947. It accurately summarises the main change. |
| Docstring Coverage | |
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files. |
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Check skipped because no linked issues were found for this pull request. |
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Check skipped because no linked issues were found for this pull request. |
| Description check | |
The pull request description directly explains the WH013 and RE005 fixes, regression tests, verification results, and scope of the changes. |
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- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Review comments at @lib/rules/workflow_hardening.ex:
- Line 1265: Update the @step_continue_on_error pattern so it matches only a
direct continue-on-error: true key in a step mapping, excluding occurrences
inside run block-scalar content. Preserve support for optional indentation and
the list-item prefix while enforcing the step-level YAML context defined for
jobs.<job_id>.steps[*].
- Around line 1305-1306: Update the sequence-indicator condition in the workflow
parsing branch to recognise a trimmed line equal to "-" as well as lines
beginning with "- ". Preserve the existing state and indentation checks so
standalone sequence entries start a step and subsequent mapping keys are
analysed by WH013.
- Line 1456: Update the line-processing branch in the workflow parsing function
around the jobs indentation check to identify and exclude YAML comment lines
before applying the indentation test. Do not append indented comment lines to
the preceding job, while preserving existing handling for blank lines and
non-comment job content; ensure performs_contents_write?/1 does not infer
operations from comments.
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lib/rules/research_extensions.exlib/rules/workflow_hardening.extest/research_extensions_test.exstest/workflow_hardening_test.exs
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🔇 Additional comments: 2
lib/rules/research_extensions.ex: 1
633-633: LGTM!test/research_extensions_test.exs: 1
453-467: LGTM!
CodeRabbit on #950: - `continue-on-error: true` inside a step's `run: |` script (a heredoc that writes a workflow file) was read as the step's own flag. It now counts only on the `- ` line or at the step's key column. - A step opened by a bare `-` line was not split out, so its flag was missed. A trimmed `-` now starts a step. - A comment indented deeper than the job header was still appended to the job above it. Comments now never join a job body, at any indent. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM
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`governance / Actions lockfile verify` fails on this PR, and on main since #945. Of the verifier's findings, only the three `step-security/harden-runner@v2.22.2` "not-pinned" records are not accepted by standards' wrapper. #948 removes those steps. This is the same three-file change; it no-ops once #948 (or a lock regeneration) lands on main. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM
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| Regex.match?(@steps_key, line) -> | ||
| {flush_step(acc, current), nil, {indent_of(line), nil}} |
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steps: while parsing workflow steps
When an earlier run: | block contains a literal steps: line—for example, a heredoc that generates a workflow—this unconditional match resets the parser to that embedded list. Once indentation returns to the real sibling steps, the parser exits the nested state without recognizing them, so a later credentialed write with continue-on-error: true is missed and WH013 emits no masked-write finding. Restrict steps: detection to the job mapping level or otherwise ignore block-scalar contents.
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The embedded steps: case is fixed in #1006 (merged in a6411e3). WH013 now reads steps through the shared Hypatia.WorkflowYaml reader, which only takes steps: at the job's own key column, so a steps: line inside a run: | script no longer resets the splitter. The regression test a `steps:` line inside an earlier step's run script does not hide the real steps fails on the old parser and passes now.
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| indent_of(line) <= elem(state, 0) -> | ||
| {flush_step(acc, current), nil, nil} |
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steps:
YAML permits an indentless sequence here, such as steps: followed by a same-column bare - whose nested keys include continue-on-error: true. This check terminates the steps state before the item-start branch can run, so that valid workflow shape is no longer recognized; unlike the previous implementation, WH013 then misses a masked credentialed write entirely. Check for a sequence item before treating same-column content as the end of steps:, or explicitly support indentless block sequences.
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Indentless sequences are fixed in #1006 (merged in a6411e3). The shared reader's lines_in_steps/2 and step_indent/2 accept - items at the steps: key's own column, so WH013 and RE001 both read them. Tests: continue-on-error on an indentless steps: item counts as masked, plus a sibling-step negative and two RE001 tests.
Generated by Claude Code
| case Regex.run(~r/^([ \t]*-[ \t]+)\S/, item) do | ||
| [_, prefix] -> String.length(prefix) | ||
| nil -> keys |> List.first("") |> indent_of() |
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For a valid step opened as - # publication step, this regex treats the comment marker as the item's first content and derives key_col from all spaces preceding it. YAML ignores that comment and allows the following mapping keys at the normal nested indentation, so continue-on-error: true no longer equals the calculated column and a masked write is missed. Detect a comment-only opener as a bare - and derive the column from the first actual key instead.
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Comment-only openers are fixed in #1006 (merged in a6411e3). WorkflowYaml.step_key_column/1 now treats - # comment as a bare -, taking the key column from the first real key. Test: continue-on-error on a step opened by `-` and a comment counts as masked, which fails on the old parser.
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In all three changed workflows, removing the first harden-runner step leaves a locally executed job handling credentials without the existing egress block: this job exposes the classic repo/workflow PAT at line 54, dependabot-automerge.yml passes a write-capable token at lines 65-69, and roadmap-sync.yml passes the App private key at lines 49-54. This directly recreates the condition that RE001 reports in lib/rules/research_extensions.ex:161-163, allowing a compromised action or checked-out script to send these credentials to arbitrary endpoints; restore the hardener and allowlist, preferably with a SHA-pinned action reference.
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RE001 reads workflows the way YAML does: KYAML as block layout, quoted keys, anchors and aliases expanded by node, jobs split by indentation, steps only under the job's own `steps:` key. WH013 still carries its own line approximation, which misses three valid shapes (#950). Give both one reader instead of growing a second. The reader's functions move verbatim into Hypatia.WorkflowYaml; the only changes are `defp` -> `def` on its API and a new `active_lines/1`, the read pipeline re001_jobs built inline. ResearchExtensions imports the reader and keeps `read_workflow/1` and `flow_to_block/1` as delegates for existing callers (WorkflowAudit, the CLI). No behaviour change: the RE and WH suites (188 tests) pass unchanged, and ResearchExtensions.scan/1 returns identical results before and after on the hypatia, echidna and standards trees. Also re-measures the module count in .claude/CLAUDE.md (142 was stale; 149 with this module). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM
WH013's masked-write check carried its own step splitter, which missed three valid shapes Codex reported on #950: - a literal `steps:` inside an earlier step's `run: |` script reset the splitter, so the real sibling steps after it were never seen; - an indentless sequence (`steps:` with `- ` items at the key's column) ended the steps value before its first item; - a step opened by `-` and a comment took the comment's column as the step's key column, so `continue-on-error: true` never matched. WH013 now reads jobs and steps through Hypatia.WorkflowYaml (comment lines dropped, aliases expanded, steps only under the job's own `steps:` key), so the first is gone by construction. The other two are fixed in the reader, which RE001 shares: its indentless `steps:` items are now read (a harden-runner step there counts), and a comment-opened step keeps its `run:`. Tests: 7 new (4 WH013, 3 RE001); 6 fail on main, one per gap, and the seventh guards the sibling-step rule in the indentless shape. WH013 and RE001 findings on the hypatia, echidna and standards trees are identical before and after. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM
## Summary Step 2 of 2, stacked on #1005. Merge that first; this PR's base is its branch. WH013's masked-write check (`continue-on-error: true` on the step that writes) used its own step splitter. Codex found three valid YAML shapes it missed on #950 (threads 4326052772, 4326052783, 4326052793): | Shape | Before | After | |---|---|---| | A `steps:` line inside an earlier step's `run: \|` script (a heredoc that writes a workflow) | the splitter reset to the embedded list and never saw the real sibling steps, so a later masked credentialed write was missed | WH013 reads steps only under the job's own `steps:` key | | An indentless sequence: `steps:` with its `- ` items at the key's column | the steps value ended before its first item | items at the key's column are read | | A step opened by `-` and a comment (`- # publication step`) | the comment's column was taken as the step's key column, so the flag never matched | a comment-only opener is a bare `-` | WH013 now reads jobs and steps through `Hypatia.WorkflowYaml`, which drops comment lines, expands aliases and finds steps by the job's field column. That removes the first gap by construction. The other two are fixed in the shared reader, so **RE001 gets them too**: - an indentless `steps:` sequence is read, so a harden-runner step there now counts; - a comment-opened step keeps its `run:`, so its exposures are seen. WH013's own `step_bodies` parser is deleted. `masked_write?/1` stays public; its steps now come from the shared reader. ## Type of change - [x] 🐛 Bug fix (false negatives in WH013 and RE001) ## How has this been verified? - Compiled the modules standalone (Elixir 1.14, `--warnings-as-errors`). hex.pm is unreachable here. - `research_extensions_test` + `workflow_hardening_test`: **195/195**. That is the 188 existing tests plus 7 new ones. - **Control:** **6 of the 7 new tests fail on `main`**: - the 3 WH013 shapes; - RE001's 3 tests for the two reader fixes (one comment-opened step, two indentless sequences). - The seventh guards the sibling-step rule in the indentless shape and passes on both. - **Blast radius:** WH013 and `ResearchExtensions.scan/1` give **identical** results before and after on the hypatia, echidna and standards trees. The fix closes the gaps without new noise. - `mix format --check-formatted`: clean. ## Notes for reviewers - WH013 now reads the workflow through `read_workflow/1`, so a KYAML workflow is read as block layout too. Block YAML is returned byte-identical. - A file whose jobs the reader can't split is still judged as one body, by its shell masks; its steps aren't searched for `continue-on-error`. That is the same safe direction as before. - The issue's other route, a full YAML parser (yamerl, later kyq), would replace `WorkflowYaml`'s internals and leave WH013 and RE001 alone. ## Checklist - [ ] My commits are **signed**. Signing is handled by the session's platform shim. - [x] I ran the project's own checks/tests locally and they pass (scoped as above). - [x] Docs are updated (CHANGELOG, comments, `masked_write?/1` doc). - [x] I have not introduced a soundness hole. The findings on real trees are unchanged, and the new tests pin each gap. --- _Generated by [Claude Code](https://claude.ai/code/session_01CYR5bf5FBLS7cXQK72aVNM)_
Summary
Follow-up to #947. Codex's review of #947 posted 5 findings shortly before it merged. CodeRabbit's review of this PR added 3 more, fixed in the second commit.
continue-on-error: trueon any step made the whole job's writes count as maskedstep_bodies/1splits eachsteps:list into items)steps: # commentwasn't recognised, so a step-level flag under it was missedsteps:key matcher accepts a trailing comment2>/dev/null/|| true/|| echocontinue-on-error: true# … git push origin mainread as a writetrap "kill \"$PID\" … || true" EXITstopped matching at the escaped quotecontinue-on-error: trueinside a step'srun: |script was read as the step's flag-line or at its key column-line wasn't split out-starts a stepType of change
How has this been verified?
hex.pm is unreachable here, so the touched rule modules were compiled standalone (Elixir 1.14) with
scanner_suppression,cicd_rules,security_errorsandactions_lock:test/workflow_hardening_test.exs+test/research_extensions_test.exs: 117/117 pass.main: escaped-quote trap, commentedsteps:, sibling-step flag, inter-job comment. The fifth (wording) is asserted inside the commented-steps:test. All 3 CodeRabbit-finding tests fail against the first commit (3133a5e).mix format --check-formattedpasses on all four files.WorkflowHardening.scan/1gives identical findings on hypatia, standards and echidna before and after the second commit (6 / 7 / 6). With RE005 included, the first commit was also identical tomain.Checklist
masked_write?/1@doc).Generated by Claude Code