fix(redaction): redact adjacent AWS keys glued end to end - #1095
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Two AWS keys with no separator between them (AKIA...AKIA...) only had the first redacted: the leading \b in the secret patterns sees a word character on the left of the second key and misses it. Apply each textSecretPattern via a helper that also retries at every redacted span end with a \b-stripped, start-anchored variant of the pattern, so a credential starting exactly where the previous one ended is still caught. Chained runs (three or more glued credentials) are followed to the end. A mid-word occurrence that does not abut a redacted span still does not match. Extracted from Twigpine#1075 per Vasanthdev2004's suggestion on Twigpine#969; Twigpine#1067 remains the fix for the RedactString leak.
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ChangesAdjacent Secret Redaction
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The adjacent-key change is mergeable after normal checks; no actionable defect remains identified. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to A short string containing many adjacent credentials can make redaction consume rapidly growing memory and processing time. This matters for diagnostic output that can include provider responses, although the evidence does not establish exposure beyond the affected process. Retained concerns
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Inline comments:
In `@internal/redaction/redaction.go`:
- Around line 124-135: In RedactString, bound the span-chaining loop to the
number of matches present before appending spans, so newly appended spans are
not processed again. Add a regression test using a long concatenated token run
and verify it produces one redaction marker per token and completes promptly.
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internal/redaction/redaction.gointernal/redaction/redaction_test.go
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Vasanthdev2004
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Reviewed at 2bb82456. The code is right, and I'd approve it as it stands. One line in the description needs changing first.
I ran the same seeded corpus through RedactString on main and on this head: 6,000 rows with no control characters and 6,000 with them, secrets and words joined by randomly chosen separators, including none.
- Without control characters: 187 rows still show a credential on main and 185 here. The only two rows that change are glued AWS keys, now fully redacted, and no row leaks here that doesn't leak on main.
- With control characters: unchanged at 313 against 313, which is right since that part is #1067's.
Taking out the anchored retry fails TestRedactStringRedactsAdjacentAWSKeys with the second key left in the clear. The 185 that remain are secrets glued onto a preceding word, which the mid-word case deliberately leaves alone, so none of them is this PR's to fix.
The line to change: Fixes #969 (the AWS-keys portion) still reads as a closing keyword. GitHub has linked #969 to this PR, so merging it would close #969 while its main fix, #1067, is still open. Part of #969 or Refs #969 keeps the link without closing the issue. That's a description edit with no push needed, and I'll approve once it's in.
CI is 9 of 9 at head.
The outer loop re-read len(spans) while the inner loop appended chained spans to the same slice, so appended spans were re-chained and the span count grew exponentially on long glued-key runs (RedactString handles untrusted content). Bound the loop to the original match count and add a regression test with 64 glued AWS keys asserting 64 markers promptly.
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The glued-key pattern is precise: an anchored twin of each pattern matching a second key exactly at a redacted span's end, chained for run-on keys, with mid-word AKIA that does not abut a redacted span still refused (no over-redaction) and the marker's closing bracket restoring the word boundary for cross-shape gluing. The exponential re-chaining hazard is explicitly bounded and pinned by a timed 64-key test. Sequencing note: this and #1067 both rewrite the same tail loop of RedactString; the split pass should run after the adjacent-span loop, and a combined test run of both applied is worth doing.
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Re-reviewed at f4c168f0. The description now says Part of #969, and GitHub no longer links #969 as closed by this PR, so that's settled.
The new commit is a real fix. The outer loop re-read len(spans) while the inner loop appended the chained spans, so every appended span chained again and a long glued run never finished. With the outer loop put back that way, TestRedactStringLongAdjacentKeyRunCompletesPromptly hits the test timeout here instead of finishing. Bounded to the original match count, it's linear.
The same seeded corpus as last time gives the same answer at this head:
- Without control characters: 187 rows show a credential on main and 185 here, and no row leaks here that doesn't leak on main.
- With control characters: unchanged.
internal/redaction passes natively on Windows, and CI is 9 of 9 at head. Approving.
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Extracts the AWS-keys improvement from #1075 as a separate small PR, per Vasanthdev2004's suggestion on #969.
Problem
Two AWS keys glued end to end with no separator (
AKIA...AKIA...) only had the first key redacted. The leading\bin the secret patterns sees a word character on the left of the second key, so it never matches, and the second credential leaks into logs.Fix
RedactStringnow applies eachtextSecretPatternvia aredactAdjacenthelper that, after the normal matches, retries at every redacted span end with a\b-stripped, start-anchored variant of the pattern. A credential starting exactly where the previous one ended is therefore still caught, including chains of three or more. A mid-word occurrence that does not abut a redacted span still does not match, so the leading-boundary rule is not weakened elsewhere.Scope
This is strictly the adjacent-keys improvement. It does not include the control-byte splitting logic or the
RedactStringleak fix from #1075; #1067 remains the fix for that issue.Testing
TestRedactStringRedactsAdjacentAWSKeys: two glued keys, three glued keys, and a mid-word non-match case.go test ./internal/redaction/: all 6 tests pass.go vetandgofmtclean.Part of #969 (the AWS-keys portion).
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