fix(be): mask credentials in request and response logs

[manamana32321]

Description

요청·응답 로그에 민감한 헤더가 마스킹되지 않고 있어 redact 설정을 보완했습니다.
토큰은 발급될 때(응답 헤더)와 쓰일 때(요청 헤더) 두 번 찍히므로 양쪽을 모두 막습니다.

대상	경로	가리는 환경	이전	이후
access token — 사용	req.headers.authorization	stage 외 전부	노출	마스킹
access token — 발급	res.headers.authorization	stage 외 전부	노출	마스킹
refresh token — 사용	req.headers.cookie	stage 외 전부	노출	마스킹
refresh token — 발급	res.headers["set-cookie"]	stage 외 전부	노출	마스킹
이메일인증 JWT — 사용	req.headers["email-auth"]	stage 외 전부	노출	마스킹
이메일인증 JWT — 발급	res.headers["email-auth"]	stage 외 전부	노출	마스킹
비밀번호 해시 (로그 루트)	password	전 환경	노출	마스킹
비밀번호 (요청 본문)	req.body.password	전 환경	마스킹	마스킹
비밀번호 확인 (요청 본문)	req.body.passwordAgain	전 환경	마스킹	마스킹

마지막 두 줄이 기존 설정이고, 나머지 7경로가 이번에 추가된 것입니다.

stage만 예외인 이유 — 쿠키 헤더를 전 환경에서 가리면 값뿐 아니라 쿠키 이름까지 사라져 디버깅이 불편해집니다. 토큰 원문이 그대로 필요한 경우도 있어 부분 마스킹(censor) 대신 stage에서는 값을 그대로 둡니다.

appEnv == "local"의 케이스는 이번 PR에서 다루지 않습니다. 환경 변수 APP_ENV가 local로 사용되는 사례 및 컨벤션이 정착이 되지 않았기 때문입니다.

Additional context

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Closes TAS-3075

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Reviewing files that changed from the base of the PR and between b221b2a and a62c284.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (3)

• apps/backend/libs/logger/src/pino-option.logger.spec.ts
• apps/backend/libs/logger/src/pino-option.logger.ts
• apps/backend/package.json

📝 Walkthrough

Walkthrough

The backend logger now redacts password fields in every environment. In production, it also redacts authorization and email-auth headers, request cookies, and response set-cookie headers. Tests cover production, stage, and an undefined environment.

Changes

Logger credential redaction

Layer / File(s)	Summary
Configure and test credential redaction apps/backend/package.json, apps/backend/libs/logger/src/pino-option.logger.ts, apps/backend/libs/logger/src/pino-option.logger.spec.ts	The backend adds Pino as a runtime dependency. buildRedactPaths always includes password paths and adds authorization, email-auth, cookie, and set-cookie paths only in production. The logger module uses paths returned by this function. Tests cover production, stage, and an undefined environment.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to b221b

Request logs outside production still contain authorization tokens and cookies, including refresh tokens. The same happens in any deployment where APP_ENV is missing or mistyped. Redact credentials by default before merging, or explicitly accept the risk.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to b221b

Production logging gains stronger credential protection, but stage and other non-production environments still retain authentication headers and cookies. This exposure predates the PR rather than being introduced or worsened by it. The shared policy affects both backend APIs, and production protection depends on the environment being configured correctly.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The residual exposure is bounded to credential-bearing records emitted through this shared logger in non-production environments, across both backend APIs. Access to those records could expose usable credentials. Tenant coverage, credential privileges, downstream log replication, and cross-environment reuse are not established, so broader compromise is not asserted.

Security Findings and Attack Paths

• observed — The retained sensitive-data-exposure finding concerns credential values remaining in serialized logs outside production. The stage test explicitly expects authorization, cookie, and set-cookie values to remain visible. Base comparison establishes that this condition predates the PR; no increased exposure was identified. Credential misuse would additionally require access to affected logs and credentials that remain valid.

Trust Boundaries and Controls

• observed — Redaction controls the transfer of request and response secrets into operational logs; it does not change authentication or authorization decisions. Password protection is unconditional, while credential-header protection depends on an exact production environment match. Missing or other environment values select the narrower policy.

Resilience and Maintainability Implications

• inferred — The tests codify the narrower stage policy and treat an undefined environment identically. They therefore preserve the current environment-dependent security guarantee rather than guard against credential exposure in every environment.

Hardening Proposals

• proposed — Consider making credential-header redaction unconditional and validating it through the actual HTTP logger in production, stage, and missing-environment cases. This would address the pre-existing exposure and remove environment naming as a prerequisite for credential confidentiality.

🚥 Pre-merge checks | ✅ 5

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Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: masking credentials in request and response logs.

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Inline comments:
Review comments at @apps/backend/libs/logger/src/pino-option.logger.ts:
- Around line 42-44: Update the redaction-path selection using appEnv,
credentialHeaderPaths, and passwordPaths to include credentialHeaderPaths in
every environment, including unset or misconfigured values, while retaining
passwordPaths and the header keys.

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• apps/backend/libs/logger/src/pino-option.logger.spec.ts
• apps/backend/libs/logger/src/pino-option.logger.ts

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