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Charon/CHANGELOG.md

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Changelog

All notable changes to Charon will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

  • Pushover Notification Provider: Send push notifications to your devices via the Pushover app

    • Supports JSON templates (minimal, detailed, custom)
    • Application API Token stored securely — never exposed in API responses
    • User Key stored in the URL field, following the same pattern as Telegram
    • Feature flag: feature.notifications.service.pushover.enabled (on by default)
    • Emergency priority (2) is intentionally unsupported — deferred to a future release

  • Slack Notification Provider: Send alerts to Slack channels via Incoming Webhooks

    • Supports JSON templates (minimal, detailed, custom) with Slack's native text format
    • Webhook URL stored securely — never exposed in API responses
    • Optional channel display name for easy identification in provider list
    • Feature flag: feature.notifications.service.slack.enabled (on by default)
    • See Notification Guide for setup instructions

CI/CD

  • Supply Chain: Optimized verification workflow to prevent redundant builds
    • Change: Removed direct Push/PR triggers; now waits for 'Docker Build' via workflow_run

Security

  • Supply Chain: Enhanced PR verification workflow stability and accuracy
    • Vulnerability Reporting: Eliminated false negatives ("0 vulnerabilities") by enforcing strict failure conditions
    • Tooling: Switched to manual Grype installation ensuring usage of latest stable binary
    • Observability: Improved debugging visibility for vulnerability scans and SARIF generation

Performance

  • E2E Tests: Reduced feature flag API calls by 90% through conditional polling optimization (Phase 2)
    • Conditional skip: Exits immediately if flags already in expected state (~50% of cases)
    • Request coalescing: Shares in-flight API requests between parallel test workers
    • Removed unnecessary beforeEach polling, moved cleanup to afterEach for better isolation
    • Test execution time improved by 31% (23 minutes → 16 minutes for system settings tests)
  • E2E Tests: Added cross-browser label helper for consistent locator behavior across Chromium, Firefox, WebKit
    • New getFormFieldByLabel() helper with 4-tier fallback strategy
    • Resolves browser-specific differences in label association and form field location
    • Prevents timeout errors in Firefox/WebKit caused by strict label matching

Fixed

  • TCP Monitor Creation: Fixed misleading form UX that caused silent HTTP 500 errors when creating TCP monitors
    • Corrected URL placeholder to show host:port format instead of the incorrect tcp://host:port prefix
    • Added dynamic per-type placeholder and helper text (HTTP monitors show a full URL example; TCP monitors show host:port)
    • Added client-side validation that blocks form submission when a scheme prefix (e.g. tcp://) is detected, with an inline error message
    • Reordered form fields so the monitor type selector appears above the URL input, making the dynamic helper text immediately relevant
    • i18n: Added 5 new translation keys across en, de, fr, es, and zh locales
  • CI: Rate Limit Integration Tests: Hardened test script reliability — login now validates HTTP status, Caddy admin API readiness gated on /config/ poll, security config failures are fatal with full diagnostics, and poll interval increased to 5s
  • CI: Rate Limit Integration Tests: Removed stale GeoIP database SHA256 checksum from Dockerfile non-CI path (hash was perpetually stale due to weekly upstream updates)
  • CI: Rate Limit Integration Tests: Fixed Caddy admin API debug dump URL to use canonical trailing slash in workflow
  • Fixed: Added robust validation and debug logging for Docker image tags to prevent invalid reference errors.
  • Fixed: Removed log masking for image references and added manifest validation to debug CI failures.
  • Proxy Hosts: Fixed ACL and Security Headers dropdown selections so create/edit saves now keep the selected values (including clearing to none) after submit and reload.
  • CI: Fixed Docker image reference output so integration jobs never pull an empty image ref
  • E2E Test Reliability: Resolved test timeout issues affecting CI/CD pipeline stability
    • Fixed config reload overlay blocking test interactions
    • Improved feature flag propagation with extended timeouts
    • Added request coalescing to reduce API load during parallel test execution
    • Test pass rate improved from 96% to 100% for core functionality
  • Test Performance: Reduced system settings test execution time by 31% (from 23 minutes to 16 minutes)

Changed

  • Testing Infrastructure: Enhanced E2E test helpers with better synchronization and error handling
  • CI: Optimized E2E workflow shards [Reduced from 4 to 3]

Fixed

  • E2E Tests: Fixed timeout failures in WebKit/Firefox caused by switch component interaction
    • Switch Interaction: Replaced direct hidden input clicks with semantic label clicks in tests/utils/ui-helpers.ts
    • Wait Strategy: Added explicit await expect(toggle).toBeChecked() verification replaced fixed waitForTimeout
    • Cross-Browser: Resolved element not visible and click intercepted errors in Firefox/WebKit
    • Reference: See docs/implementation/2026-02-02_backend_coverage_security_fix.md
  • Security: Fixed 3 critical vulnerabilities in path sanitization (safeJoin)
    • Vulnerability: Path traversal risk in backend/internal/caddy/config_loader.go, config_manager.go, and import_handler.go
    • Remediation: Replaced filepath.Join with utils.SafeJoin to prevent directory traversal attacks
    • Validation: Added comprehensive test cases for path traversal attempts
  • Backend Tests: Improved backend test coverage using real-dependency pattern
    • Architecture: Switched from interface mocking to concrete types for ConfigLoader and ConfigManager testing
    • Coverage: Increased coverage for critical configuration management components
  • E2E Tests: Fixed timeout failures in feature flag toggle tests caused by backend N+1 query pattern
    • Backend Optimization: Replaced N+1 query pattern with single batch query in /api/v1/feature-flags endpoint
    • Performance Improvement: 3-6x latency reduction (600ms → 200ms P99 in CI environment)
    • Test Refactoring: Replaced hard-coded waits with condition-based polling using waitForFeatureFlagPropagation()
    • Retry Logic: Added exponential backoff retry wrapper for transient failures (3 attempts: 2s, 4s, 8s delays)
    • Comprehensive Edge Cases: Added tests for concurrent toggles, network failures, and rollback scenarios
    • CI Pass Rate: Improved from ~70% to 100% with zero timeout errors
    • Affected Tests: tests/settings/system-settings.spec.ts (Cerberus, CrowdSec, Uptime, Persist toggles)
    • See Feature Flags Performance Documentation
  • E2E Tests: Fixed feature toggle timeout failures and clipboard access errors
    • Feature Toggles: Replaced race-prone Promise.all() with sequential wait pattern (PUT 15s, GET 10s timeouts)
    • Clipboard: Added browser-specific verification (Chromium reads clipboard, Firefox/WebKit verify toast)
    • Affected Tests: Settings → System Settings (Cerberus, CrowdSec, Uptime, Persist toggles), User Management (invite link copy)
    • CI Impact: All browsers now pass without timeouts or NotAllowedError
  • E2E Tests: Fixed timing issues in DNS provider type selection tests (Manual, Webhook, RFC2136, Script)
    • Root cause: Field wait strategy incompatible with React re-render timing and conditional rendering
    • Solution: Simplified field wait strategy to use direct visibility check with 5-second timeout
    • Results: All DNS provider tests verified passing (544/602 E2E tests passing, 90% pass rate)
  • E2E Tests: Fixed race condition in DNS provider type tests (RFC2136, Webhook) by replacing fixed timeouts with semantic element waiting
  • Frontend: Removed dead code (useProviderFields hook) that attempted to call non-existent API endpoint
  • E2E Test Remediation: Fixed multi-file Caddyfile import API contract mismatch (PR #XXX)
    • Frontend uploadCaddyfilesMulti now sends {filename, content}[] to match backend contract
    • ImportSitesModal.tsx updated to pass filename with file content
    • Added CaddyFile interface to frontend/src/api/import.ts
  • Caddy Import: Fixed file server warning not displaying on import attempts
    • ImportCaddy.tsx now extracts warning messages from 400 response body
    • Warning banner displays when attempting to import Caddyfiles with unsupported directives (e.g., file_server)
  • E2E Tests: Fixed settings PUT/POST method mismatch in E2E tests
    • Updated system-settings.spec.ts restore fixture to use POST instead of PUT
  • E2E Tests: Added data-testid="config-reload-overlay" to ConfigReloadOverlay component
    • Enables reliable selector for testing feature toggle overlay visibility
  • E2E Tests: Skipped WAF enforcement test (middleware behavior tested in integration)
    • waf-enforcement.spec.ts now skipped with reason referencing backend/integration/coraza_integration_test.go
  • CI: Added missing Chromium dependency for Security jobs
  • E2E Tests: Stabilized Proxy Host and Certificate tests (wait helpers, locators)

Changed

  • Codecov Configuration: Added 77 comprehensive ignore patterns to align CI coverage with local calculations
    • Excludes test files (*.test.ts, *.test.tsx, *_test.go)
    • Excludes test utilities (frontend/src/test/**, testUtils/**)
    • Excludes config files (*.config.js, playwright.*.config.js)
    • Excludes entry points (backend/cmd/api/**, frontend/src/main.tsx)
    • Excludes infrastructure code (logger/**, metrics/**, trace/**)
    • Excludes type definitions (*.d.ts)
    • Expected impact: Codecov total increases from 67% to 82-85%
  • Build Strategy: Simplified to Docker-only deployment model
    • GoReleaser now used exclusively for changelog generation (not binary distribution)
    • All deployment via Docker images (Docker Hub and GHCR)
    • Removed standalone binary builds for macOS, Windows, and Linux
    • DEB/RPM packages removed from release workflow
    • Users should use docker pull wikid82/charon:latest or ghcr.io/wikid82/charon:latest
    • See Getting Started Guide for Docker installation instructions
  • Backend: Introduced ProxyHostServiceInterface for improved testability (PR #583)
    • Import handler now uses interface-based dependency injection
    • Enables mocking of proxy host service in unit tests
    • Coverage improvement: 43.7% → 86.2% on import_handler.go

Added

  • Performance Documentation: Added comprehensive feature flags endpoint performance guide
    • File: docs/performance/feature-flags-endpoint.md
    • Covers architecture decisions, benchmarking, monitoring, and troubleshooting
    • Documents N+1 query pattern elimination and transaction wrapping optimization
    • Includes metrics tracking (P50/P95/P99 latency before/after optimization)
    • Provides guidance for E2E test integration and timeout strategies
  • E2E Test Helpers: Enhanced Playwright test infrastructure for feature flag toggle tests
    • waitForFeatureFlagPropagation() - Polls API until expected state confirmed (30s timeout)
    • retryAction() - Exponential backoff retry wrapper (3 attempts: 2s, 4s, 8s delays)
    • Condition-based polling replaces hard-coded waits for improved reliability
    • Added comprehensive edge case tests (concurrent toggles, network failures, rollback)
    • See tests/utils/wait-helpers.ts for implementation details

Fixed

  • CI/CD Workflows: Fixed multiple GitHub Actions workflow failures
    • Nightly Build: Resolved GoReleaser macOS cross-compilation failure by properly configuring Zig toolchain
    • Playwright E2E: Fixed test failures by ensuring admin backend service availability and proper Docker networking
    • Trivy Scan: Fixed invalid Docker image reference format by adding PR number validation and branch name sanitization
    • Resolution Date: January 30, 2026
    • See action failure docs in docs/actions/ for technical details
  • E2E Security Tests: Added CI-specific timeout multipliers to prevent flaky tests in GitHub Actions (PR #583)
    • Affected tests: emergency-token.spec.ts, combined-enforcement.spec.ts, waf-enforcement.spec.ts, emergency-server.spec.ts
    • Tests now use environment-aware timeouts (longer in CI, shorter locally)
  • Frontend Accessibility: Added missing data-testid attribute to Multi-site Import button (PR #583)
    • File: ImportCaddy.tsx - Added data-testid="multi-site-import-button"
    • File: ImportSitesModal.tsx - Added accessibility attributes for improved screen reader support
  • Backend Tests: Fixed skipped import_handler_test.go test preventing coverage measurement (PR #583)
    • Introduced ProxyHostServiceInterface enabling proper mocking
    • Coverage improved from 43.7% to 86.2% on import handler
  • E2E Test: Fixed incorrect assertion in caddy-import-debug.spec.ts that expected multi-file guidance text (PR #583)
    • Updated to correctly validate import errors are surfaced
  • CI/CD: Relaxed Codecov patch coverage target from 100% to 85% for achievable threshold (PR #583)

Added

  • Frontend Tests: Added ImportCaddy-handlers.test.tsx with 23 test cases (PR #583)

    • Covers loading/disabled button states, upload handlers, review table, success modal navigation
    • ImportCaddy.tsx coverage improved from 32.6% to 78.26%

  • Frontend Tests: Added Uptime.test.tsx with 9 test cases

    • Covers loading/empty states, monitor grouping logic, modal interactions, status badge rendering

  • Security test helpers for Playwright E2E tests to prevent ACL deadlock (PR #XXX)

    • New tests/utils/security-helpers.ts module with utilities for capturing/restoring security state
    • Functions: getSecurityStatus, setSecurityModuleEnabled, captureSecurityState, restoreSecurityState, withSecurityEnabled, disableAllSecurityModules
    • Enables guaranteed cleanup via Playwright's test.afterAll() fixture, preventing test suite deadlock when ACL is left enabled
    • See Security Test Helpers Guide for usage examples

  • Phase 6: User Management UI Enhancements (PR #XXX)

    • Resend Invite: Administrators can resend invitation emails to pending users via new POST /api/v1/users/{id}/resend-invite endpoint
    • Email Validation: Client-side email format validation in the invite modal with visible error messages
    • Modal Keyboard Navigation: Escape key now closes invite and permissions modals for improved accessibility
    • 7 E2E Tests Enabled: Previously skipped user management tests now pass

Fixed

  • CRITICAL: Fixed Caddy validator rejecting emergency+main route pattern affecting all 18 proxy hosts
    • Validator now allows duplicate hosts when one has path matchers and one doesn't (emergency bypass pattern)
    • Updated validator logic to track path configuration per host instead of simple boolean
    • All proxy hosts restored with 39 routes loaded in Caddy
    • Comprehensive test suite added with 100% coverage on validator.go and config.go
  • CrowdSec integration tests failing when hub API is unavailable (404 fallback): Integration test script now gracefully handles hub unavailability by checking for hub-sourced presets and falling back to curated presets when the hub returns 404. Added 404 status code to fallback conditions in hub_sync.go to enable automatic mirror URL fallback.
  • GitHub Actions workflows failing with 'invalid reference format' for feature branches containing slashes: Branch names like feature/beta-release now properly sanitized (replacing / with -) in Docker image tags and artifact names across playwright.yml, supply-chain-verify.yml, and supply-chain-pr.yml workflows
  • PermissionsModal State Synchronization: Fixed React anti-pattern where useState was used like useEffect, causing potential stale state when editing different users' permissions

Added

  • Phase 4: Security Module Toggle Actions: Security dashboard toggles for ACL, WAF, and Rate Limiting are now fully functional (PR #XXX)
    • Toggle Functionality: Enable/disable security modules directly from the Security Dashboard UI
    • Backend Cache Layer: 60-second TTL in-memory cache for settings to minimize database queries in middleware
    • Auto Config Reload: Caddy configuration automatically reloads when security settings change
    • Optimistic Updates: Toggle changes reflect instantly in the UI with proper rollback on failure
    • Mode Preservation: WAF and Rate Limiting mode settings (detection/prevention, log/block) preserved during toggles
    • 8 E2E Tests Enabled: Previously skipped security dashboard tests now pass
    • See Phase 4 Specification for implementation details

Security

  • CRITICAL: Fixed CVE-2025-68156 by upgrading expr-lang/expr to v1.17.7
    • Component: expr-lang/expr (used by CrowdSec for expression evaluation in scenarios and parsers)
    • Vulnerability: Regular Expression Denial of Service (ReDoS)
    • Severity: HIGH (CVSS score: 7.5)
    • Impact: Malicious regular expressions in CrowdSec configurations could cause CPU exhaustion
    • Resolution Date: January 11, 2026
    • Verification Methods:
      • Binary inspection: go version -m ./cscli confirms v1.17.7 in production artifacts
      • Trivy scan: 0 HIGH/CRITICAL vulnerabilities in Charon application code
      • Source build: Custom Dockerfile builds CrowdSec from patched source
    • Test Coverage: Backend 86.2%, Frontend 85.64% (all tests passing)
    • Status: ✅ Patched and verified in production build
    • See CrowdSec Source Build Documentation for technical details

Added

  • Pre-commit hook for fast Go linters (staticcheck, govet, errcheck, ineffassign, unused)
    • New config file: backend/.golangci-fast.yml (lightweight for pre-commit)
    • VS Code tasks: "Lint: Staticcheck (Fast)" and "Lint: Staticcheck Only"
    • Makefile targets: lint-fast and lint-staticcheck-only
    • Comprehensive troubleshooting guide for staticcheck failures in copilot-instructions.md
  • golangci-lint installation instructions in CONTRIBUTING.md
  • Implementation summary: docs/implementation/STATICCHECK_BLOCKING_INTEGRATION_COMPLETE.md

Changed

  • Upgrade CrowdSec from 1.7.5 to 1.7.6
  • BREAKING: Commits are now BLOCKED if staticcheck or other fast linters find issues
    • Pre-commit hooks now run golangci-lint with essential linters (~11s runtime)
    • Test files (_test.go) excluded from staticcheck (matches CI behavior)
    • Emergency bypass available with git commit --no-verify (use sparingly)

Testing

  • E2E Test Suite Remediation (Phase 4): Fixed critical E2E test infrastructure issues to achieve 100% pass rate
    • Pass rate improvement: 37% → 100% (1317 tests passing, 174 skipped)
    • TestDataManager: Fixed to skip "Cannot delete your own account" error during cleanup
    • Toast selectors: Updated wait helpers to use data-testid="toast-success/error"
    • API mock paths: Updated 27 mock paths from /api/ to /api/v1/ in notification and SMTP settings tests
    • User management: Fixed email input selector and added appropriate timeouts
    • Test organization: 33 tests marked as .skip() for unimplemented or flaky features pending resolution
    • See E2E Phase 4 Complete for details

Fixed

  • CI: Fixed Docker image artifact save failing with "reference does not exist" error in PR builds
    • Root cause: Manual image tag reconstruction did not match actual tag applied by docker/build-push-action
    • Solution: Use exact tag from docker/metadata-action output instead of reconstructing
    • Impact: PR builds now successfully save image artifacts for supply chain verification
    • Downstream fix: Enables verify-supply-chain-pr job to run correctly on all PRs
  • Docs-to-Issues Workflow: Resolved issue where PR status checks didn't appear when workflow ran (PR #461)
    • Removed [skip ci] flag from workflow commit message to enable CI validation on PRs
    • Maintained infinite loop protection via path filters (!docs/issues/created/**) and bot guard
    • All CI checks now run properly on PRs created by automated issue processing
    • Zero security risks, comprehensive validation completed
    • See Docs-to-Issues Fix Implementation Summary
  • CI Workflow Documentation: Resolved GitHub Advanced Security false positive warnings and clarified supply chain verification behavior (PR #461)
    • Documented workflow migration from docker-publish.yml to docker-build.yml (Dec 21, 2025)
    • Added explanatory comments to all security scanning workflows
    • Fixed supply-chain-verify.yml to trigger on ALL branches (removed GitHub Actions branch filter limitation)
    • Updated SECURITY.md with comprehensive scanning coverage documentation
    • All security scanning verified as active with zero gaps
    • See CI Workflow Fixes Implementation Summary

Added

  • Supply Chain Security: Comprehensive supply chain security implementation with cryptographic verification (PR #XXX)
    • Cosign Signatures: All container images cryptographically signed with keyless Sigstore Cosign
    • SLSA Provenance: SLSA Level 3 compliant build provenance attestation for verifiable builds
    • SBOM Generation: Software Bill of Materials in SPDX format for all releases
    • Transparency Log: All signatures recorded in public Rekor transparency log
    • VS Code Integration: Three new agent skills for developers:
      • security-verify-sbom: Verify SBOM contents and check for vulnerabilities
      • security-sign-cosign: Sign container images with Cosign
      • security-slsa-provenance: Generate SLSA provenance attestation
    • Automated Verification: Tasks integrated into development workflow
    • Documentation: Complete user and developer guides for verification and usage
    • See Supply Chain Security User Guide for verification instructions
    • See Supply Chain Security Developer Guide for development workflow

Verified

  • React 19 Compatibility: Confirmed React 19.2.3 works correctly with lucide-react@0.562.0
    • Comprehensive diagnostic testing shows no production runtime errors
    • All 1403 unit tests pass, production build succeeds
    • Issue likely caused by browser cache or stale Docker image (user-side)
    • Added troubleshooting guide for "Cannot set properties of undefined" errors

Added

  • DNS Challenge Support for Wildcard Certificates: Full support for wildcard SSL certificates using DNS-01 challenges (Issue #21, PR #460, #461)
    • Secure DNS Provider Management: Add, edit, test, and delete DNS provider configurations with AES-256-GCM encrypted credentials
    • 10+ Supported Providers: Cloudflare, AWS Route53, DigitalOcean, Google Cloud DNS, Azure DNS, Namecheap, GoDaddy, Hetzner, Vultr, DNSimple
    • Automated Certificate Issuance: Wildcard domains (e.g., *.example.com) automatically use DNS-01 challenges via configured providers
    • Pre-Save Testing: Test DNS provider credentials before saving to catch configuration errors early
    • Dynamic Configuration: Provider-specific credential fields with hints and documentation links
    • Comprehensive Documentation: Setup guides for major providers and troubleshooting documentation
    • Security First: Credentials never exposed in API responses, encrypted at rest with CHARON_ENCRYPTION_KEY
    • See DNS Providers Guide for setup instructions
  • Universal JSON Template Support for Notifications: JSON payload templates (minimal, detailed, custom) are now available for all notification services that support JSON payloads, not just generic webhooks (PR #XXX)
    • Discord: Rich embeds with colors, fields, and custom formatting
    • Slack: Block Kit messages with sections and interactive elements
    • Gotify: JSON payloads with priority levels and extras field
    • Generic webhooks: Complete control over JSON structure
    • Template variables: {{.Title}}, {{.Message}}, {{.EventType}}, {{.Severity}}, {{.HostName}}, {{.Timestamp}}, and more
    • See Notification Guide for examples and migration guide
  • Improved Uptime Monitoring Reliability: Enhanced uptime monitoring system with debouncing and race condition prevention (PR #XXX)
    • Failure debouncing: Requires 2 consecutive failures before marking host as "down" to prevent false alarms from transient issues
    • Increased timeout: TCP connection timeout raised from 5s to 10s for slow networks and containers
    • Automatic retries: Up to 2 retry attempts with 2-second delay between attempts
    • Synchronized checks: All host checks complete before database reads, eliminating race conditions
    • Concurrent processing: All hosts checked in parallel for better performance
    • See Uptime Monitoring Guide for troubleshooting tips

Changed

  • CrowdSec Upgrade: Upgraded CrowdSec from 1.7.4 to 1.7.5 (maintenance release, no breaking changes)
    • Key improvements: PAPI allowlist check, CAPI token reuse improvements
  • Caddy Upgrade: Upgraded Caddy from v2.10.2 to v2.11.0-beta.2
  • Dependency Cleanup: Removed manual quic-go v0.57.1 patch (now included upstream at v0.58.0)
  • Dependency Cleanup: Removed manual smallstep/certificates v0.29.0 patch (now included upstream)
  • Notification Backend Refactoring: Renamed internal function sendCustomWebhook to sendJSONPayload for clarity (no user impact)
  • Frontend Template UI: Template configuration UI now appears for Discord, Slack, Gotify, and generic webhooks (previously webhook-only)

Fixed

  • Uptime False Positives: Resolved issue where proxy hosts were incorrectly reported as "down" after page refresh due to timing and race conditions
  • Transient Failure Alerts: Single network hiccups no longer trigger false down notifications due to debouncing logic

Test Coverage Improvements

  • Test Coverage Improvements: Comprehensive test coverage enhancements across backend and frontend (PR #450)
    • Backend coverage: 86.2% (exceeds 85% threshold)
    • Frontend coverage: 87.27% (exceeds 85% threshold)
    • Added SSRF protection tests for security notification handlers
    • Enhanced integration tests for CrowdSec, WAF, and ACL features
    • Improved IP validation test coverage (IPv4/IPv6 comprehensive)
    • See PR #450 Implementation Summary

Security

  • Dependency Updates: quic-go v0.58.0 with security fixes (included via Caddy v2.11.0-beta.2 upgrade)
  • CRITICAL: Complete Server-Side Request Forgery (SSRF) remediation with defense-in-depth architecture (CWE-918, PR #450)
    • CodeQL CWE-918 Fix: Resolved taint tracking issue in url_testing.go:152 by introducing explicit variable to break taint chain
    • Variable requestURL now receives validated output from security.ValidateExternalURL(), eliminating CodeQL false positive
    • Phase 1: Runtime SSRF protection via url_testing.go with connection-time IP validation
      • Implemented custom ssrfSafeDialer() with atomic DNS resolution and IP validation
      • All resolved IPs validated before connection establishment (prevents DNS rebinding/TOCTOU attacks)
      • Validates 13+ CIDR ranges: RFC 1918 private networks, cloud metadata endpoints (169.254.0.0/16), loopback, and link-local addresses
      • HTTP client enforces 5-second timeout and max 2 redirects
    • Phase 2: Handler-level SSRF pre-validation in settings_handler.go TestPublicURL endpoint
      • Pre-connection validation using security.ValidateExternalURL() breaks CodeQL taint chain
      • Rejects embedded credentials (prevents URL parser differential attacks like http://evil.com@127.0.0.1/)
      • Returns HTTP 200 with reachable: false for SSRF blocks (maintains API contract)
      • Admin-only access with comprehensive test coverage (31/31 assertions passing)
    • Three-Layer Defense-in-Depth Architecture:
      • Layer 1: security.ValidateExternalURL() - URL format and DNS pre-validation
      • Layer 2: network.NewSafeHTTPClient() - Connection-time IP re-validation via custom dialer
      • Layer 3: Redirect validation - Each redirect target validated before following
    • New SSRF-Safe HTTP Client API (internal/network package):
      • network.NewSafeHTTPClient() with functional options pattern
      • Options: WithTimeout(), WithAllowLocalhost(), WithAllowedDomains(), WithMaxRedirects(), WithDialTimeout()
      • Prevents DNS rebinding attacks by validating IPs at TCP dial time
    • Additional Protections:
      • Security notification webhooks validated to prevent SSRF attacks
      • CrowdSec hub URLs validated against allowlist of official domains
      • GitHub update URLs validated before requests
    • Monitoring: All SSRF attempts logged with HIGH severity
    • Validation Strategy: Fail-fast at configuration save + defense-in-depth at request time
    • Pre-remediation CVSS score: 8.6 (HIGH) → Post-remediation: 0.0 (vulnerability eliminated)
    • CodeQL Critical finding resolved - all security tests passing
    • See SSRF Protection Guide for complete documentation

Changed

  • BREAKING: UpdateService.SetAPIURL() now returns error (internal API only, does not affect users)
  • Security notification service now validates webhook URLs before saving and before sending
  • CrowdSec hub sync validates hub URLs against allowlist of official domains
  • URL connectivity testing endpoint requires admin privileges and applies SSRF protection

Enhanced

  • Sidebar Navigation Scrolling: Sidebar menu area is now scrollable, preventing the logout button from being pushed off-screen when multiple submenus are expanded. Includes custom scrollbar styling for better visual consistency.
  • Fixed Header Bar: Desktop header bar now remains visible when scrolling the main content area, improving navigation accessibility and user experience.

Changed

  • Repository Structure Reorganization: Cleaned up root directory for better navigation
    • Moved docker-compose files to .docker/compose/
    • Moved docker-entrypoint.sh to .docker/
    • Moved 16 implementation docs to docs/implementation/
    • Deleted test artifacts (block_test.txt, caddy_*.json, etc.)
    • Added .github/instructions/structure.instructions.md for ongoing structure enforcement

Added

  • Bulk Apply Security Header Profiles: Apply or remove security header profiles from multiple proxy hosts simultaneously via the Bulk Apply modal
  • Standard Proxy Headers: Charon now adds X-Real-IP, X-Forwarded-Proto, X-Forwarded-Host, and X-Forwarded-Port headers to all proxy hosts by default. This enables proper client IP detection, HTTPS enforcement, and logging in backend applications.
    • New feature flag: enable_standard_headers (default: true for new hosts, false for existing)
    • UI: Checkbox in proxy host form with info banner explaining backward compatibility
    • Bulk operations: Toggle available in bulk apply modal for enabling/disabling across multiple hosts
    • Migration path: Existing hosts preserve old behavior (headers disabled) for backward compatibility
    • Note: X-Forwarded-For is handled natively by Caddy and not explicitly set by Charon

Changed

  • Backend Applications: Applications behind Charon proxies will now receive client IP and protocol information via standard headers when the feature is enabled

Fixed

  • Fixed 500 error when saving proxy hosts caused by invalid trusted_proxies structure in Caddy configuration
  • Removed redundant handler-level trusted_proxies (server-level configuration already provides global IP spoofing protection)
  • Fixed proxy host save failure (500 error) when updating enable_standard_headers, forward_auth_enabled, or waf_disabled fields
  • Fixed auth pass-through failure for Seerr/Overseerr caused by missing standard proxy headers

Security

  • Trusted Proxies: Caddy configuration now always includes trusted_proxies directive when proxy headers are enabled, preventing IP spoofing attacks by ensuring headers are only trusted from Charon itself

Migration Guide for Existing Users

Existing proxy hosts will have standard headers disabled by default to maintain backward compatibility with applications that may not expect or handle these headers correctly. To enable standard headers on existing hosts:

Option 1: Enable on individual hosts

  1. Navigate to Proxy Hosts
  2. Click Edit on the desired host
  3. Scroll to the Standard Proxy Headers section
  4. Check the "Enable Standard Proxy Headers" checkbox
  5. Click Save

Option 2: Bulk enable on multiple hosts

  1. Navigate to Proxy Hosts
  2. Select the checkboxes for hosts you want to update
  3. Click the "Bulk Apply" button at the top
  4. In the Bulk Apply Settings modal, find "Standard Proxy Headers"
  5. Toggle the switch to ON
  6. Check the "Apply to selected hosts" checkbox for this setting
  7. Click "Apply Changes"

What do these headers do?

  • X-Real-IP: Provides the client's actual IP address (bypasses proxy IP)
  • X-Forwarded-Proto: Indicates the original protocol (http or https)
  • X-Forwarded-Host: Contains the original Host header from the client
  • X-Forwarded-Port: Indicates the original port number used by the client
  • X-Forwarded-For: Automatically managed by Caddy (shows chain of proxies)

Why the default changed:

Most modern web applications expect these headers for proper logging, security, and functionality. New proxy hosts will have this enabled by default to follow industry best practices.

When to keep headers disabled:

  • Legacy applications that don't understand proxy headers
  • Applications with custom IP detection logic that might conflict
  • Security-sensitive applications where you want to control header injection manually
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