🛡️ Sentinel: [HIGH] 비표준 스키마 구문으로 인한 DSN Redaction 우회 취약점 수정

[seonghobae]

🚨 Severity: HIGH

💡 Vulnerability: urllib.parse.urlsplit은 snowflake_invalid:user:password@host처럼 ://가 생략되거나 비표준 문자(언더스코어 등)가 포함된 스키마를 제대로 파싱하지 못하고 빈 스키마로 평가하여 전체 DSN을 path로 간주하는 동작을 합니다. 이로 인해 에러 메시지 작성 시 urlsplit에 의존하는 기존의 DSN 자격 증명 추출 로직(_password_candidates_from_dsn)이 후보 비밀번호를 식별하지 못해 비밀번호가 암호화되지 않고 로그에 노출되는 우회(bypass) 취약점이 발생했습니다.

🎯 Impact: 공격자가 고의로 비표준 형태의 스키마를 사용해 악의적인 연결 문자열을 주입할 경우, 서버 오류 메시지에 자격 증명이 그대로 노출될 위험이 있습니다.

🔧 Fix: dsn_redaction.py의 _password_candidates_from_dsn 함수에 핫픽스를 적용했습니다. urlsplit 결과에서 netloc이 비어 있지만 DSN 내에 :// 또는 : 기호가 포함된 경우, 강제로 http://와 같은 임시 스키마(dummy schema)를 치환하여 다시 파싱함으로써 비밀번호 추출기가 정확한 netloc과 password를 얻어 비밀번호 마스킹을 수행할 수 있도록 수정했습니다. 관련된 보안 학습 내용을 .jules/sentinel.md에 문서화했습니다.

✅ Verification: 로컬 단위 테스트 커버리지를 통해 (100%) app.dsn_redaction 패키지의 검증을 성공적으로 마쳤으며, 비표준 스키마(콜론만 있거나 쿼리가 없는 경우 등)에 대한 비밀번호 추출을 완벽히 수행하는 것을 확인했습니다 (test_dsn_redaction.py).

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PR created automatically by Jules for task 7086362576969472011 started by @seonghobae

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[Copilot]

Pull request overview

Fixes a HIGH-severity credential-leak bypass in backend DSN error-message redaction by improving password extraction for malformed/“non-standard” DSNs that urllib.parse.urlsplit fails to interpret as having an authority (netloc). This strengthens the backend’s defensive logging/exception handling so injected credentials are reliably masked even under adversarial DSN formats.

Changes:

• Added a fallback re-parse path in _password_candidates_from_dsn that injects a dummy scheme when netloc is empty and the DSN looks scheme-like (contains :// or :).
• Expanded unit tests to cover “colon scheme without slashes”, best-effort parsing with malformed authorities, and “query has no secret” non-redaction behavior.
• Documented the vulnerability pattern and prevention guidance in .jules/sentinel.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
backend/app/dsn_redaction.py	Adds additional fallback parsing to extract credential candidates from malformed DSNs so redaction cannot be bypassed by non-standard schemes.
backend/tests/test_dsn_redaction.py	Adds/extends test coverage for the new malformed-DSN cases and ensures non-secret query params remain visible.
.jules/sentinel.md	Records the DSN redaction bypass learning and prevention guidance for future security work.

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[opencode-agent]

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 6c10773e7c8b4c0043749a949fde7d70dd19b921.

• Head SHA: 6c10773e7c8b4c0043749a949fde7d70dd19b921

• Workflow run: 29881134793

• Workflow attempt: 1

Coverage evidence

Coverage Decision

• Result: FAIL
• Test evidence: not proven passing
• Docstring evidence: not proven passing when configured
• Failure count: 1

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file: sentinel.md"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file: sentinel.md"]
  R1 --> V1["required checks"]
  Evidence --> S2["Backend (2 files)"]
  S2 --> I2["API and service runtime"]
  I2 --> R2["Review risk: Backend (2 files)"]
  R2 --> V2["backend tests"]

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[opencode-agent]

OpenCode Review Overview

• Head SHA: 6c10773e7c8b4c0043749a949fde7d70dd19b921
• Workflow run: 29881134793
• Workflow attempt: 1
• Gate result: REQUEST_CHANGES (approval step)

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 6c10773e7c8b4c0043749a949fde7d70dd19b921.

• Head SHA: 6c10773e7c8b4c0043749a949fde7d70dd19b921

• Workflow run: 29881134793

• Workflow attempt: 1

Coverage evidence

Coverage Decision

• Result: FAIL
• Test evidence: not proven passing
• Docstring evidence: not proven passing when configured
• Failure count: 1

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file: sentinel.md"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file: sentinel.md"]
  R1 --> V1["required checks"]
  Evidence --> S2["Backend (2 files)"]
  S2 --> I2["API and service runtime"]
  I2 --> R2["Review risk: Backend (2 files)"]
  R2 --> V2["backend tests"]

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