uwe.admin/oatpp-authkit
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oatpp-authkit/README.md
Uwe Schuster 32356ad226 v0.1.0: initial clean-lift from fewo-webapp 
Header-only C++ library; CMake config package; zero-coupling files lifted
from fewo-webapp:

  interceptor/SecurityHeadersInterceptor.hpp
  interceptor/BodySizeLimitInterceptor.hpp
  handler/JsonErrorHandler.hpp
  util/RateLimiter.hpp
  util/TokenExtract.hpp    (extractToken, isValidIp, clientIpTrusted)
  startup/RequireEncryptionKey.hpp

fewo-specific couplings (bindAddress global, fewo::config) replaced with
explicit function arguments so the library stands alone.

AuthInterceptor + requireAdmin deferred to v0.2 — they need IAuthBackend /
IAuthPolicy / IRuntimeConfig seams designed first.

docs/security-baseline.md ships CSP / rate-limit / body-size / encryption
key constants as language-neutral baselines for non-C++ consumers.

Closes fewo-webapp#412

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-21 21:42:53 +02:00

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oatpp-authkit

Header-only C++ library distilled from fewo-webapp's hardened auth / security stack. Header-only, oatpp 1.3+, C++17.

What's in v0.1 (the clean-lift set)

Header Purpose
interceptor/SecurityHeadersInterceptor.hpp CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy. Strict defaults.
interceptor/BodySizeLimitInterceptor.hpp Reject request bodies above a configurable limit with 413 before they hit your handlers.
handler/JsonErrorHandler.hpp Normalises thrown exceptions into {status, message} JSON so controllers never leak raw HTML error pages.
util/RateLimiter.hpp In-memory token-bucket keyed on an arbitrary string (typically the client IP from clientIpTrusted).
util/TokenExtract.hpp extractToken (Cookie/Bearer), isValidIp (IPv4/IPv6 via inet_pton), clientIpTrusted (loopback-gated XFF).
startup/RequireEncryptionKey.hpp requireEncryptionKey(envVarName, encryptionEnabled, allowPlaintext) — refuse startup without a symmetric key unless a dev flag overrides.

Consume via CMake

# FetchContent (pin to a tag):
include(FetchContent)
FetchContent_Declare(oatpp-authkit
    GIT_REPOSITORY https://git.uwe-schuster.info/uwe.admin/oatpp-authkit.git
    GIT_TAG v0.1.0)
FetchContent_MakeAvailable(oatpp-authkit)

target_link_libraries(app PRIVATE oatpp::authkit)

Or after cmake --install:

find_package(oatpp-authkit 0.1 REQUIRED)
target_link_libraries(app PRIVATE oatpp::authkit)

Roadmap

  • v0.2 — AuthInterceptor + requireAdmin ported onto three seams (IAuthBackend, IAuthPolicy, IRuntimeConfig) so consumers plug in their own user store, public-path list, and admin role set without forking the interceptor.
  • Later — session cookie helpers, API-key rotation, re-encryption migration.

See docs/security-baseline.md for language-neutral CSP / rate-limit / body-size constants that non-C++ consumers can re-implement directly.