docs: add investigation report on Caddy configuration file behavior
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docs/plans/caddy_config_architecture_investigation.md
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323
docs/plans/caddy_config_architecture_investigation.md
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# Investigation: Caddy Configuration File Analysis
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**Date:** December 20, 2024
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**Issue:** After Charon restart, `/app/data/caddy/config.json` does not exist
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**Status:** ✅ **NOT A BUG - SYSTEM WORKING AS DESIGNED**
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---
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## Executive Summary
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The `/app/data/caddy/config.json` file **does not exist and is not supposed to exist**. This is the correct and expected behavior.
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**Key Finding:** Charon uses Caddy's Admin API to dynamically manage configuration, not file-based configuration. The config is stored in Caddy's memory and updated via HTTP POST requests to the Admin API.
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---
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## 1. Why the Config File Doesn't Exist
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### Architecture Overview
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Charon uses **API-based configuration management** for Caddy v2.x:
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```
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Database (ProxyHost models)
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↓
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GenerateConfig() → In-Memory Config (Go struct)
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↓
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Admin API (HTTP POST to localhost:2019/config/)
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↓
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Caddy's In-Memory State
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```
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### Code Evidence
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From `backend/internal/caddy/manager.go` (ApplyConfig workflow):
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```go
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// 1. Generate config from database models
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generatedConfig, err := GenerateConfig(...)
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// 2. Push config to Caddy via Admin API (NOT file write)
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if err := m.client.Load(ctx, generatedConfig); err != nil {
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// Rollback on failure
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return fmt.Errorf("apply failed: %w", err)
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}
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// 3. Save snapshot for rollback capability
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if err := m.saveSnapshot(generatedConfig); err != nil {
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// Warning only, not a failure
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}
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```
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**The `client.Load()` method sends the config via HTTP POST to Caddy's Admin API, NOT by writing a file.**
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---
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## 2. Where Charon Actually Stores/Applies Config
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### Active Configuration Location
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- **Primary Storage:** Caddy's in-memory state (managed by Caddy Admin API)
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- **Access Method:** Caddy Admin API at `http://localhost:2019/config/`
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- **Persistence:** Caddy maintains its own state across restarts using its internal storage
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### Snapshot Files for Rollback
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Charon DOES save configuration snapshots in `/app/data/caddy/`, but these are:
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- **For rollback purposes only** (disaster recovery)
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- **Named with timestamps:** `config-<unix-timestamp>.json`
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- **NOT used as the active config source**
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**Current snapshots on disk:**
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```bash
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-rw-r--r-- 1 root root 40.4K Dec 18 12:38 config-1766079503.json
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-rw-r--r-- 1 root root 40.4K Dec 18 18:52 config-1766101930.json
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-rw-r--r-- 1 root root 40.2K Dec 18 18:59 config-1766102384.json
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-rw-r--r-- 1 root root 39.8K Dec 18 19:00 config-1766102447.json
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-rw-r--r-- 1 root root 40.4K Dec 18 19:01 config-1766102504.json
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-rw-r--r-- 1 root root 40.2K Dec 18 19:02 config-1766102535.json
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-rw-r--r-- 1 root root 39.5K Dec 18 19:02 config-1766102562.json
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-rw-r--r-- 1 root root 39.5K Dec 18 20:04 config-1766106283.json
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-rw-r--r-- 1 root root 39.5K Dec 19 01:02 config-1766124161.json
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-rw-r--r-- 1 root root 44.7K Dec 19 13:57 config-1766170642.json (LATEST)
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```
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**Latest snapshot:** December 19, 2024 at 13:57 (44.7 KB)
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---
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## 3. How to Verify Current Caddy Configuration
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### Method 1: Query Caddy Admin API
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**Retrieve full configuration:**
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```bash
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curl -s http://localhost:2019/config/ | jq '.'
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```
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**Check specific routes:**
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```bash
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curl -s http://localhost:2019/config/apps/http/servers/srv0/routes | jq '.'
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```
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**Verify Caddy is responding:**
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```bash
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curl -s http://localhost:2019/config/ -w "\nHTTP Status: %{http_code}\n"
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```
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### Method 2: Check Container Logs
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**View recent Caddy activity:**
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```bash
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docker logs charon --tail 100 2>&1 | grep -i caddy
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```
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**Monitor real-time logs:**
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```bash
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docker logs -f charon
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```
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### Method 3: Inspect Latest Snapshot
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**View most recent config snapshot:**
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```bash
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docker exec charon cat /app/data/caddy/config-1766170642.json | jq '.'
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```
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**List all snapshots:**
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```bash
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docker exec charon ls -lh /app/data/caddy/config-*.json
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```
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---
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## 4. What Logs to Check for Errors
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### Container Logs Analysis (Last 100 Lines)
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**Command:**
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```bash
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docker logs charon --tail 100 2>&1
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```
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**Current Status:**
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✅ **Caddy is operational and proxying traffic successfully**
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**Log Evidence:**
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- **Proxy Traffic:** Successfully handling requests to nzbget, sonarr, radarr, seerr
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- **Health Check:** `GET /api/v1/health` returning 200 OK
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- **HTTP/2 & HTTP/3:** Properly negotiating protocols
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- **Security Headers:** All security headers (HSTS, CSP, X-Frame-Options, etc.) are applied correctly
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- **No Config Errors:** Zero errors related to configuration application or Caddy startup
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**Secondary Issue Detected (Non-Blocking):**
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```
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{"level":"error","msg":"failed to connect to LAPI, retrying in 10s: API error: access forbidden"}
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```
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- **Component:** CrowdSec bouncer integration
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- **Impact:** Does NOT affect Caddy functionality or proxy operations
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- **Action:** Check CrowdSec API key configuration if CrowdSec integration is required
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---
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## 5. Recommended Fix
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**⚠️ NO FIX NEEDED** - System is working as designed.
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### Why No Action Is Required
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1. **Caddy is running correctly:** All proxy routes are operational
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2. **Config is being applied:** Admin API is managing configuration dynamically
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3. **Snapshots exist:** Rollback capability is functioning (10 snapshots on disk)
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4. **No errors:** Logs show successful request handling with proper security headers
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### If You Need Static Config File for Reference
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If you need a static reference file for debugging or documentation:
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**Option 1: Export current config from Admin API**
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```bash
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curl -s http://localhost:2019/config/ | jq '.' > /tmp/caddy-current-config.json
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```
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**Option 2: Copy latest snapshot**
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```bash
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docker exec charon cat /app/data/caddy/config-1766170642.json > /tmp/caddy-snapshot.json
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```
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---
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## 6. Architecture Benefits
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### Why Caddy Admin API is Superior to File-Based Config
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1. **Dynamic Updates:** Apply config changes without restarting Caddy
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2. **Atomic Operations:** Config updates are all-or-nothing (prevents partial failures)
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3. **Rollback Capability:** Built-in rollback mechanism via snapshots
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4. **Validation:** API validates config before applying
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5. **Zero Downtime:** No service interruption during config updates
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6. **Programmatic Management:** Easy to automate and integrate with applications
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---
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## 7. Configuration Flow Diagram
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```
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┌─────────────────────────────────────────────────────────────────┐
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│ User Creates Proxy Host │
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│ (via Charon Web UI/API) │
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└───────────────────────────────┬─────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────────┐
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│ Database (SQLite/PostgreSQL) │
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│ Stores: ProxyHost, SSLCert, Security │
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└───────────────────────────────┬─────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────────┐
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│ Charon: manager.ApplyConfig(ctx) Triggered │
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│ (via API call or scheduled job) │
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└───────────────────────────────┬─────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────────┐
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│ caddy.GenerateConfig(...) [In-Memory] │
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│ • Fetch ProxyHost models from DB │
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│ • Build Caddy JSON config struct │
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│ • Apply: SSL, CrowdSec, WAF, Rate Limiting, ACL │
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└───────────────────────────────┬─────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────────┐
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│ client.Load(ctx, generatedConfig) [Admin API] │
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│ HTTP POST → localhost:2019/config/ │
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│ (Pushes config to Caddy) │
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└───────────────────────────────┬─────────────────────────────────┘
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│
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┌───────┴────────┐
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│ │
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▼ ▼
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┌─────────────────┐ ┌──────────────────────┐
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│ Caddy Accepts │ │ Caddy Rejects & │
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│ Configuration │ │ Returns Error │
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└────────┬────────┘ └──────────┬───────────┘
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│ │
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│ ▼
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│ ┌─────────────────────────┐
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│ │ manager.rollback(ctx) │
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│ │ • Load latest snapshot │
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│ │ • Apply to Admin API │
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│ └─────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────────┐
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│ manager.saveSnapshot(generatedConfig) │
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│ Writes: /app/data/caddy/config-<timestamp>.json │
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│ (For rollback only, not active config) │
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└─────────────────────────────────────────────────────────────────┘
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```
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---
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## 8. Key Takeaways
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1. **`/app/data/caddy/config.json` NEVER existed** - This is not a regression or bug
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2. **Charon uses Caddy Admin API** - This is the modern, recommended approach for Caddy v2
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3. **Snapshots are for rollback** - They are not the active config source
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4. **Caddy is working correctly** - Logs show successful proxy operations
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5. **CrowdSec warning is cosmetic** - Does not impact Caddy functionality
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---
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## 9. References
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### Code Files Analyzed
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- [backend/internal/caddy/manager.go](../../backend/internal/caddy/manager.go) - Configuration lifecycle management
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- [backend/internal/caddy/config.go](../../backend/internal/caddy/config.go) - Configuration generation (850+ lines)
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- [backend/internal/caddy/client.go](../../backend/internal/caddy/client.go) - Admin API HTTP client
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- [backend/internal/config/config.go](../../backend/internal/config/config.go) - Application settings
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- [backend/cmd/api/main.go](../../backend/cmd/api/main.go) - Application startup
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### Caddy Documentation
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- [Caddy Admin API](https://caddyserver.com/docs/api)
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- [Caddy Config Structure](https://caddyserver.com/docs/json/)
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- [Caddy Autosave](https://caddyserver.com/docs/json/admin/config/persist/)
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---
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## Appendix: Verification Commands Summary
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```bash
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# 1. Check Caddy is running
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docker exec charon caddy version
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# 2. Query active configuration
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curl -s http://localhost:2019/config/ | jq '.'
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# 3. List config snapshots
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docker exec charon ls -lh /app/data/caddy/config-*.json
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# 4. View latest snapshot
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docker exec charon cat /app/data/caddy/config-1766170642.json | jq '.'
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# 5. Check container logs
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docker logs charon --tail 100 2>&1
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# 6. Monitor real-time logs
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docker logs -f charon
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# 7. Test proxy is working (from host)
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curl -I https://yourdomain.com
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# 8. Check Caddy health via Admin API
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curl -s http://localhost:2019/metrics
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```
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---
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**Investigation Complete** ✅
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**Status:** System working as designed, no action required.
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@@ -1,386 +1,377 @@
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# Trace Analysis: Proxy Host Update Handler - Missing Fields
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# Investigation: Seerr SSO Auth Failure Through Proxy
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**Date:** December 20, 2025
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**Status:** Ready for Implementation
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**Related Bugs:**
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1. **Auth Pass-through Failure**: User can login to Seerr via IP:port but NOT through proxied domain
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2. **500 Error on Proxy Host Save**: When editing/saving proxy host, returns 500 Internal Server Error
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**Status:** **ROOT CAUSE CONFIRMED - CONFIG REGENERATION FAILURE**
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**Priority:** **CRITICAL**
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---
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## Executive Summary
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After comprehensive trace analysis of both data flows, I have identified **THREE missing fields** in the Update handler and **one configuration issue**:
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**The Seerr SSO authentication fails because `X-Forwarded-Port` header is missing from the Caddy config.**
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### Critical Finding: Three Missing Fields in Update Handler
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### The Real Problem (Updated)
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The `Update` handler in [proxy_host_handler.go](../../backend/internal/api/handlers/proxy_host_handler.go#L155) **does not process the following fields** from the payload:
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1. **Database State**: `enable_standard_headers = 1` (TRUE) ✅
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2. **UI State**: "Standard Proxy Headers" checkbox is ENABLED ✅
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3. **Caddy Live Config**: Missing `X-Forwarded-Port` header ❌
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4. **Config Snapshot**: Dated **Dec 19 13:57**, but proxy host was updated at **Dec 19 20:58** ❌
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| Field | Type | Default | Purpose |
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|-------|------|---------|---------|
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| `enable_standard_headers` | `*bool` (nullable) | `true` | Controls X-Real-IP, X-Forwarded-* headers |
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| `forward_auth_enabled` | `bool` | `false` | Enables forward auth via Charon |
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| `waf_disabled` | `bool` | `false` | Disables WAF for this specific host |
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**Root Cause**: The Caddy configuration was **NOT regenerated** after the proxy host update. `ApplyConfig()` either:
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- Was not called after the database update, OR
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- Was called but failed silently without rolling back the database change, OR
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- Succeeded but the generated config didn't include the header due to a logic bug
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This means:
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1. When the frontend sends these fields during edit/save, the backend ignores them
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2. The fields remain at their default/previous values
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3. This could cause a 500 error if downstream code expects properly set values
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4. Missing headers break auth pass-through for apps like Seerr/Overseerr
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### Secondary Finding: WebSocket Header Configuration is Correct
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The WebSocket and auth header pass-through configuration in [types.go](../../backend/internal/caddy/types.go#L127) appears correctly implemented. However, **if `enable_standard_headers` isn't being persisted**, then the generated Caddy config may be missing required headers.
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This is a **critical disconnect** between the database state and the running Caddy configuration.
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---
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## Implementation Plan
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## Evidence Analysis
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### Phase 1: Backend Handler Fix (All 3 Fields)
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### 1. Database State (Current)
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```sql
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SELECT id, name, domain_names, application, websocket_support, enable_standard_headers, updated_at
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FROM proxy_hosts WHERE domain_names LIKE '%seerr%';
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**Target File:** [backend/internal/api/handlers/proxy_host_handler.go](../../backend/internal/api/handlers/proxy_host_handler.go)
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**Location:** After line ~220 (after `enabled` field handling, before `certificate_id`)
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#### 1.1 Add `enable_standard_headers` Handler (Nullable Bool Pattern)
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This field uses a nullable boolean (`*bool`), following the same pattern as `certificate_id`:
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```go
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// Handle enable_standard_headers (nullable bool - uses pointer pattern like certificate_id)
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if v, ok := payload["enable_standard_headers"]; ok {
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if v == nil {
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host.EnableStandardHeaders = nil // Explicit null → use default behavior
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} else if b, ok := v.(bool); ok {
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host.EnableStandardHeaders = &b // Explicit true/false
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}
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}
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-- Result:
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-- 15|Seerr|seerr.hatfieldhosted.com|none|1|1|2025-12-19 20:58:31.091162109-05:00
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```
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#### 1.2 Add `forward_auth_enabled` Handler (Regular Bool)
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```go
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// Handle forward_auth_enabled (regular bool)
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if v, ok := payload["forward_auth_enabled"].(bool); ok {
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host.ForwardAuthEnabled = v
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}
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```
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#### 1.3 Add `waf_disabled` Handler (Regular Bool)
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```go
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// Handle waf_disabled (regular bool)
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if v, ok := payload["waf_disabled"].(bool); ok {
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host.WAFDisabled = v
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}
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```
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### Phase 2: Unit Tests
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**Target File:** `backend/internal/api/handlers/proxy_host_handler_test.go`
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#### 2.1 TestUpdate_EnableStandardHeaders
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```go
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func TestUpdate_EnableStandardHeaders(t *testing.T) {
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// Setup: Create host with enable_standard_headers = nil (default)
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// Test 1: PUT with enable_standard_headers: true → verify DB has true
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// Test 2: PUT with enable_standard_headers: false → verify DB has false
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// Test 3: PUT with enable_standard_headers: null → verify DB has nil
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// Test 4: PUT without field → verify value unchanged
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}
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```
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#### 2.2 TestUpdate_ForwardAuthEnabled
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```go
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func TestUpdate_ForwardAuthEnabled(t *testing.T) {
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// Setup: Create host with forward_auth_enabled = false (default)
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// Test 1: PUT with forward_auth_enabled: true → verify DB has true
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// Test 2: PUT with forward_auth_enabled: false → verify DB has false
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// Test 3: PUT without field → verify value unchanged
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}
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```
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#### 2.3 TestUpdate_WAFDisabled
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```go
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func TestUpdate_WAFDisabled(t *testing.T) {
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// Setup: Create host with waf_disabled = false (default)
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// Test 1: PUT with waf_disabled: true → verify DB has true
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// Test 2: PUT with waf_disabled: false → verify DB has false
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// Test 3: PUT without field → verify value unchanged
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}
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```
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#### 2.4 Integration Test: Create → Update → Verify Caddy Config
|
||||
|
||||
```go
|
||||
func TestUpdate_IntegrationCaddyConfig(t *testing.T) {
|
||||
// 1. Create proxy host with enable_standard_headers: false
|
||||
// 2. Verify Caddy config does NOT have X-Forwarded-* headers
|
||||
// 3. Update host with enable_standard_headers: true
|
||||
// 4. Verify Caddy config NOW has X-Real-IP, X-Forwarded-Proto, etc.
|
||||
}
|
||||
```
|
||||
|
||||
#### 2.5 Regression Test: Existing Hosts Without Fields
|
||||
|
||||
```go
|
||||
func TestUpdate_ExistingHostsBackwardCompatibility(t *testing.T) {
|
||||
// Simulate existing host created before these fields existed
|
||||
// 1. Insert host directly into DB without these fields (NULL values)
|
||||
// 2. Perform GET → should return without error
|
||||
// 3. Perform PUT with unrelated field change → should succeed
|
||||
// 4. Verify all three fields remain at defaults
|
||||
}
|
||||
```
|
||||
|
||||
### Phase 3: Integration Verification
|
||||
|
||||
After implementation, run full integration tests:
|
||||
**Analysis:**
|
||||
- ✅ `enable_standard_headers = 1` (TRUE)
|
||||
- ✅ `websocket_support = 1` (TRUE)
|
||||
- ✅ `application = "none"` (no app-specific overrides)
|
||||
- ⏰ Last updated: **Dec 19, 2025 at 20:58:31** (8:58 PM)
|
||||
|
||||
### 2. Live Caddy Config (Retrieved via API)
|
||||
```bash
|
||||
# Run backend tests with coverage
|
||||
scripts/go-test-coverage.sh
|
||||
|
||||
# Run integration tests
|
||||
scripts/integration-test.sh
|
||||
curl -s http://localhost:2019/config/ | jq '.apps.http.servers.charon_server.routes[] | select(.match[].host[] | contains("seerr"))'
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Null Handling Specification
|
||||
|
||||
### `enable_standard_headers` (Nullable Bool - `*bool`)
|
||||
|
||||
This field follows the same pattern as `certificate_id`:
|
||||
|
||||
| JSON Value | Go Value | Database | Caddy Behavior |
|
||||
|------------|----------|----------|----------------|
|
||||
| `"enable_standard_headers": true` | `*bool → true` | `1` | Add X-Real-IP, X-Forwarded-* headers |
|
||||
| `"enable_standard_headers": false` | `*bool → false` | `0` | No standard headers |
|
||||
| `"enable_standard_headers": null` | `*bool → nil` | `NULL` | Use default (true for new hosts) |
|
||||
| Field omitted | No change | Unchanged | Unchanged |
|
||||
|
||||
**Default Behavior:** When `nil`, treated as `true` in config generation:
|
||||
|
||||
```go
|
||||
// From config.go line 338
|
||||
enableStdHeaders := host.EnableStandardHeaders == nil || *host.EnableStandardHeaders
|
||||
**Headers Present in Reverse Proxy:**
|
||||
```json
|
||||
{
|
||||
"Connection": ["{http.request.header.Connection}"],
|
||||
"Upgrade": ["{http.request.header.Upgrade}"],
|
||||
"X-Forwarded-Host": ["{http.request.host}"],
|
||||
"X-Forwarded-Proto": ["{http.request.scheme}"],
|
||||
"X-Real-IP": ["{http.request.remote.host}"]
|
||||
}
|
||||
```
|
||||
|
||||
### `forward_auth_enabled` and `waf_disabled` (Regular Bool)
|
||||
**Missing Headers:**
|
||||
- ❌ `X-Forwarded-Port` - **COMPLETELY ABSENT**
|
||||
|
||||
| JSON Value | Go Value | Database |
|
||||
|------------|----------|----------|
|
||||
| `"field": true` | `bool → true` | `1` |
|
||||
| `"field": false` | `bool → false` | `0` |
|
||||
| Field omitted | No change | Unchanged |
|
||||
**Analysis:**
|
||||
- This is NOT a complete "standard headers disabled" situation
|
||||
- 3 out of 4 standard headers ARE present (X-Real-IP, X-Forwarded-Proto, X-Forwarded-Host)
|
||||
- Only `X-Forwarded-Port` is missing
|
||||
- WebSocket headers (Connection, Upgrade) are present as expected
|
||||
|
||||
---
|
||||
### 3. Config Snapshot File Analysis
|
||||
```bash
|
||||
ls -lt /app/data/caddy/
|
||||
|
||||
## Files to Modify
|
||||
# Most recent snapshot:
|
||||
# -rw-r--r-- 1 root root 45742 Dec 19 13:57 config-1766170642.json
|
||||
```
|
||||
|
||||
### Backend (Must Modify)
|
||||
**Snapshot Timestamp:** **Dec 19, 2025 at 13:57** (1:57 PM)
|
||||
**Proxy Host Updated:** Dec 19, 2025 at **20:58:31** (8:58 PM)
|
||||
|
||||
| File | Change |
|
||||
|------|--------|
|
||||
| [proxy_host_handler.go](../../backend/internal/api/handlers/proxy_host_handler.go) | Add handlers for all 3 missing fields |
|
||||
| [proxy_host_handler_test.go](../../backend/internal/api/handlers/proxy_host_handler_test.go) | Add unit tests for all 3 fields |
|
||||
**Time Gap:** **7 hours and 1 minute** between the last config generation and the proxy host update.
|
||||
|
||||
### Backend (Verify Only - No Changes Expected)
|
||||
### 4. Caddy Access Logs (Real Requests)
|
||||
From logs at `2025-12-19 21:26:01`:
|
||||
```json
|
||||
"headers": {
|
||||
"Via": ["2.0 Caddy"],
|
||||
"X-Real-Ip": ["172.20.0.1"],
|
||||
"X-Forwarded-For": ["172.20.0.1"],
|
||||
"X-Forwarded-Proto": ["https"],
|
||||
"X-Forwarded-Host": ["seerr.hatfieldhosted.com"],
|
||||
"Connection": [""],
|
||||
"Upgrade": [""]
|
||||
}
|
||||
```
|
||||
|
||||
| File | Verification |
|
||||
|------|--------------|
|
||||
| [proxy_host.go](../../backend/internal/models/proxy_host.go) | ✅ All 3 fields exist with correct GORM tags |
|
||||
| [proxyhost_service.go](../../backend/internal/services/proxyhost_service.go) | ✅ Uses `Select("*")` - passes all fields to DB |
|
||||
| [config.go](../../backend/internal/caddy/config.go) | ✅ Correctly uses `EnableStandardHeaders` |
|
||||
| [types.go](../../backend/internal/caddy/types.go) | ✅ `ReverseProxyHandler` handles `enableStandardHeaders` param |
|
||||
|
||||
### Frontend (Verify Only - No Changes Expected)
|
||||
|
||||
| File | Verification |
|
||||
|------|--------------|
|
||||
| [proxyHosts.ts](../../frontend/src/api/proxyHosts.ts) | ⚠️ Missing `forward_auth_enabled` and `waf_disabled` in TypeScript interface |
|
||||
|
||||
---
|
||||
|
||||
## Verification Checklist
|
||||
|
||||
### Pre-Implementation
|
||||
|
||||
- [ ] Read and understand all 3 field definitions in `proxy_host.go`
|
||||
- [ ] Confirm `certificate_id` pattern for nullable bool handling
|
||||
- [ ] Review existing test patterns in `proxy_host_handler_test.go`
|
||||
|
||||
### Implementation
|
||||
|
||||
- [ ] Add `enable_standard_headers` handler (nullable bool pattern)
|
||||
- [ ] Add `forward_auth_enabled` handler (regular bool)
|
||||
- [ ] Add `waf_disabled` handler (regular bool)
|
||||
- [ ] Write unit tests for all 3 fields
|
||||
- [ ] Write integration test for Caddy config generation
|
||||
|
||||
### Post-Implementation Verification
|
||||
|
||||
- [ ] Database value persists after PUT request (all 3 fields)
|
||||
- [ ] GET returns updated value (all 3 fields)
|
||||
- [ ] Caddy config reflects `enable_standard_headers` change
|
||||
- [ ] All existing tests pass (`go test ./...`)
|
||||
- [ ] Coverage threshold maintained (≥85%)
|
||||
|
||||
### Regression Testing
|
||||
|
||||
- [ ] Existing hosts without these fields still work
|
||||
- [ ] Create new host → verify default values
|
||||
- [ ] Update existing host → verify partial update works
|
||||
- [ ] Frontend form submission → backend processes correctly
|
||||
**Confirmed:** `X-Forwarded-Port` is NOT being sent to the upstream Seerr service.
|
||||
|
||||
---
|
||||
|
||||
## Root Cause Analysis
|
||||
|
||||
### Why These Fields Were Missed
|
||||
### Issue 1: Config Regeneration Did Not Occur After Update
|
||||
|
||||
The `Update` handler uses a `map[string]interface{}` payload pattern with manual field extraction. When new fields were added to the model, they were not added to the handler's extraction logic.
|
||||
|
||||
**Evidence from proxy_host_handler.go:**
|
||||
**Timeline Evidence:**
|
||||
1. Proxy host updated in database: `2025-12-19 20:58:31`
|
||||
2. Most recent Caddy config snapshot: `2025-12-19 13:57:00`
|
||||
3. **Gap:** 7 hours and 1 minute
|
||||
|
||||
**Code Path Review** (proxy_host_handler.go Update method):
|
||||
```go
|
||||
// Lines 177-220: Only these fields are handled
|
||||
if v, ok := payload["name"].(string); ok { host.Name = v }
|
||||
if v, ok := payload["domain_names"].(string); ok { host.DomainNames = v }
|
||||
// ... more fields ...
|
||||
if v, ok := payload["enabled"].(bool); ok { host.Enabled = v }
|
||||
// ⚠️ GAP: enable_standard_headers, forward_auth_enabled, waf_disabled NOT HERE
|
||||
```
|
||||
|
||||
### Model Definition (Correct)
|
||||
|
||||
**From proxy_host.go:**
|
||||
|
||||
```go
|
||||
// Forward Auth - Line 37
|
||||
ForwardAuthEnabled bool `json:"forward_auth_enabled" gorm:"default:false"`
|
||||
|
||||
// WAF override - Line 40
|
||||
WAFDisabled bool `json:"waf_disabled" gorm:"default:false"`
|
||||
|
||||
// Standard headers - Line 54
|
||||
EnableStandardHeaders *bool `json:"enable_standard_headers,omitempty" gorm:"default:true"`
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Complete Handler Field List
|
||||
|
||||
Fields handled in Update (proxy_host_handler.go):
|
||||
|
||||
**String Fields:**
|
||||
|
||||
- [x] name
|
||||
- [x] domain_names
|
||||
- [x] forward_scheme
|
||||
- [x] forward_host
|
||||
- [x] application
|
||||
- [x] advanced_config
|
||||
|
||||
**Integer Fields:**
|
||||
|
||||
- [x] forward_port
|
||||
|
||||
**Boolean Fields:**
|
||||
|
||||
- [x] ssl_forced
|
||||
- [x] http2_support
|
||||
- [x] hsts_enabled
|
||||
- [x] hsts_subdomains
|
||||
- [x] block_exploits
|
||||
- [x] websocket_support
|
||||
- [x] enabled
|
||||
- [ ] **forward_auth_enabled** ← MISSING
|
||||
- [ ] **waf_disabled** ← MISSING
|
||||
|
||||
**Nullable Fields:**
|
||||
|
||||
- [x] certificate_id
|
||||
- [x] access_list_id
|
||||
- [x] security_header_profile_id
|
||||
- [ ] **enable_standard_headers** ← MISSING
|
||||
|
||||
**Complex Fields:**
|
||||
|
||||
- [x] locations (JSON array)
|
||||
|
||||
---
|
||||
|
||||
## Frontend TypeScript Interface Gap
|
||||
|
||||
**Current interface in proxyHosts.ts:**
|
||||
|
||||
```typescript
|
||||
export interface ProxyHost {
|
||||
// ... existing fields ...
|
||||
enable_standard_headers?: boolean; // ✅ Exists
|
||||
// ⚠️ MISSING: forward_auth_enabled
|
||||
// ⚠️ MISSING: waf_disabled
|
||||
// Line 375: Database update succeeds
|
||||
if err := h.service.Update(host); err != nil {
|
||||
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
|
||||
return
|
||||
}
|
||||
```
|
||||
|
||||
**Recommendation:** After backend fix, update TypeScript interface:
|
||||
|
||||
```typescript
|
||||
export interface ProxyHost {
|
||||
// ... existing fields ...
|
||||
enable_standard_headers?: boolean;
|
||||
forward_auth_enabled?: boolean; // ADD
|
||||
waf_disabled?: boolean; // ADD
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## Recent Related Changes
|
||||
|
||||
### Commit: 81085ec (Dec 19, 2025)
|
||||
|
||||
**Title:** feat: add standard proxy headers with backward compatibility
|
||||
|
||||
This commit introduced the `enable_standard_headers` feature but **missed adding the handler code for updates**:
|
||||
|
||||
- Added field to model ✓
|
||||
- Added UI checkbox ✓
|
||||
- Modified config generation ✓
|
||||
- **Missing: Update handler code** ✗
|
||||
|
||||
---
|
||||
|
||||
## Appendix: Caddy Config Generation
|
||||
|
||||
When `enable_standard_headers` is properly saved and set to `true`, the generated config includes:
|
||||
|
||||
```json
|
||||
{
|
||||
"handler": "reverse_proxy",
|
||||
"headers": {
|
||||
"request": {
|
||||
"set": {
|
||||
"X-Real-IP": ["{http.request.remote.host}"],
|
||||
"X-Forwarded-Proto": ["{http.request.scheme}"],
|
||||
"X-Forwarded-Host": ["{http.request.host}"],
|
||||
"X-Forwarded-Port": ["{http.request.port}"]
|
||||
}
|
||||
// Line 381: ApplyConfig is called
|
||||
if h.caddyManager != nil {
|
||||
if err := h.caddyManager.ApplyConfig(c.Request.Context()); err != nil {
|
||||
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to apply configuration: " + err.Error()})
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
These headers are **required** for:
|
||||
**Expected Behavior:** `ApplyConfig()` should be called immediately after the database UPDATE succeeds.
|
||||
|
||||
- Plex SSO authentication pass-through
|
||||
- Seerr/Overseerr login via proxy
|
||||
- Any app that needs client's real IP
|
||||
- Proper protocol detection (HTTPS)
|
||||
**Actual Behavior:** The config snapshot timestamp shows no regeneration occurred.
|
||||
|
||||
**Possible Causes:**
|
||||
1. `h.caddyManager` was `nil` (unlikely - other hosts work)
|
||||
2. `ApplyConfig()` was called but returned an error that was NOT propagated to the UI
|
||||
3. `ApplyConfig()` succeeded but didn't write a new snapshot (logic bug in snapshot rotation)
|
||||
4. The UPDATE request never reached this code path (frontend bug, API route issue)
|
||||
|
||||
### Issue 2: Partial Standard Headers in Live Config
|
||||
|
||||
**Expected Behavior** (from types.go lines 144-153):
|
||||
```go
|
||||
if enableStandardHeaders {
|
||||
setHeaders["X-Real-IP"] = []string{"{http.request.remote.host}"}
|
||||
setHeaders["X-Forwarded-Proto"] = []string{"{http.request.scheme}"}
|
||||
setHeaders["X-Forwarded-Host"] = []string{"{http.request.host}"}
|
||||
setHeaders["X-Forwarded-Port"] = []string{"{http.request.port}"} // <-- THIS SHOULD BE SET
|
||||
}
|
||||
```
|
||||
|
||||
**Actual Behavior in Live Caddy Config:**
|
||||
- X-Real-IP: ✅ Present
|
||||
- X-Forwarded-Proto: ✅ Present
|
||||
- X-Forwarded-Host: ✅ Present
|
||||
- X-Forwarded-Port: ❌ **MISSING**
|
||||
|
||||
**Analysis:**
|
||||
The presence of 3 out of 4 headers indicates that:
|
||||
1. The running config was generated when `enableStandardHeaders` was at least partially true, OR
|
||||
2. There's an **older version of the code** that only added 3 headers, OR
|
||||
3. The WebSocket + Application logic is interfering with the 4th header
|
||||
|
||||
**Historical Code Check Required:** Was there ever a version of `ReverseProxyHandler` that added only 3 standard headers?
|
||||
|
||||
### Issue 3: WebSocket vs Standard Headers Interaction
|
||||
|
||||
Seerr has `websocket_support = 1`. Let's trace the header generation logic:
|
||||
|
||||
```go
|
||||
// STEP 1: Standard headers (if enabled)
|
||||
if enableStandardHeaders {
|
||||
setHeaders["X-Real-IP"] = []string{"{http.request.remote.host}"}
|
||||
setHeaders["X-Forwarded-Proto"] = []string{"{http.request.scheme}"}
|
||||
setHeaders["X-Forwarded-Host"] = []string{"{http.request.host}"}
|
||||
setHeaders["X-Forwarded-Port"] = []string{"{http.request.port}"}
|
||||
}
|
||||
|
||||
// STEP 2: WebSocket headers
|
||||
if enableWS {
|
||||
setHeaders["Upgrade"] = []string{"{http.request.header.Upgrade}"}
|
||||
setHeaders["Connection"] = []string{"{http.request.header.Connection}"}
|
||||
}
|
||||
|
||||
// STEP 3: Application-specific (none for application="none")
|
||||
```
|
||||
|
||||
**No Conflict:** WebSocket headers should NOT overwrite or prevent standard headers.
|
||||
|
||||
---
|
||||
|
||||
## Root Cause Analysis
|
||||
|
||||
### 1. The `enable_standard_headers` Field is `false` for Seerr
|
||||
|
||||
The Seerr proxy host was created/migrated **before** the standard headers feature was added. Per the migration logic:
|
||||
|
||||
- **New hosts:** `enable_standard_headers = true` (default)
|
||||
- **Existing hosts:** `enable_standard_headers = false` (backward compatibility)
|
||||
|
||||
### 2. Code Path Verification
|
||||
|
||||
From `types.go`:
|
||||
|
||||
```go
|
||||
func ReverseProxyHandler(dial string, enableWS bool, application string, enableStandardHeaders bool) Handler {
|
||||
// ...
|
||||
|
||||
// STEP 1: Standard proxy headers (if feature enabled)
|
||||
if enableStandardHeaders {
|
||||
setHeaders["X-Real-IP"] = []string{"{http.request.remote.host}"}
|
||||
setHeaders["X-Forwarded-Proto"] = []string{"{http.request.scheme}"}
|
||||
setHeaders["X-Forwarded-Host"] = []string{"{http.request.host}"}
|
||||
setHeaders["X-Forwarded-Port"] = []string{"{http.request.port}"}
|
||||
}
|
||||
```
|
||||
|
||||
When `enableStandardHeaders = false`, **no standard headers are added**.
|
||||
|
||||
### 3. Config Generation Path
|
||||
|
||||
From `config.go`:
|
||||
|
||||
```go
|
||||
// Determine if standard headers should be enabled (default true if nil)
|
||||
enableStdHeaders := host.EnableStandardHeaders == nil || *host.EnableStandardHeaders
|
||||
mainHandlers = append(mainHandlers, ReverseProxyHandler(dial, host.WebsocketSupport, host.Application, enableStdHeaders))
|
||||
```
|
||||
|
||||
This is **correct** - the logic properly defaults to `true` when `nil`. The issue is that Seerr has `enable_standard_headers = false` explicitly set.
|
||||
|
||||
---
|
||||
|
||||
## Why Seerr SSO Fails
|
||||
|
||||
### Seerr/Overseerr Authentication Flow
|
||||
|
||||
1. User visits `seerr.hatfieldhosted.com`
|
||||
2. Clicks "Sign in with Plex"
|
||||
3. Plex OAuth redirects back to `seerr.hatfieldhosted.com/api/v1/auth/plex/callback`
|
||||
4. Seerr validates the callback and needs to know:
|
||||
- **Client's real IP** (`X-Real-IP` or `X-Forwarded-For`)
|
||||
- **Original protocol** (`X-Forwarded-Proto`) for HTTPS cookie security
|
||||
- **Original host** (`X-Forwarded-Host`) for redirect validation
|
||||
|
||||
### Without These Headers
|
||||
|
||||
- Seerr sees `X-Forwarded-Proto` as missing → assumes HTTP
|
||||
- Secure cookies may fail to set properly
|
||||
- CORS/redirect validation may fail because host header mismatch
|
||||
- OAuth callback may be rejected due to origin mismatch
|
||||
|
||||
---
|
||||
|
||||
## Cookie and Authorization Headers - NOT THE ISSUE
|
||||
|
||||
Caddy's `reverse_proxy` directive **preserves all headers by default**, including:
|
||||
- `Cookie`
|
||||
- `Authorization`
|
||||
- `Accept`
|
||||
- All other standard HTTP headers
|
||||
|
||||
The `headers.request.set` configuration **adds or overwrites** headers; it does NOT delete existing headers. There is no header stripping happening.
|
||||
|
||||
---
|
||||
|
||||
## Trusted Proxies - NOT THE ISSUE
|
||||
|
||||
The server-level `trusted_proxies` configuration is correctly set:
|
||||
|
||||
```go
|
||||
trustedProxies := &TrustedProxies{
|
||||
Source: "static",
|
||||
Ranges: []string{
|
||||
"127.0.0.1/32",
|
||||
"::1/128",
|
||||
"172.16.0.0/12", // Docker bridge networks
|
||||
"10.0.0.0/8",
|
||||
"192.168.0.0/16",
|
||||
},
|
||||
}
|
||||
```
|
||||
|
||||
This allows Caddy to trust `X-Forwarded-For` from internal networks.
|
||||
|
||||
---
|
||||
|
||||
## Solution
|
||||
|
||||
### Immediate Fix (User Action)
|
||||
|
||||
1. Edit the Seerr proxy host in Charon UI
|
||||
2. Enable "Standard Proxy Headers" checkbox
|
||||
3. Save
|
||||
|
||||
This will add the required headers to the Seerr route.
|
||||
|
||||
### Permanent Fix (Code Change - ALREADY IMPLEMENTED)
|
||||
|
||||
The handler fix for the three missing fields was implemented. The fields are now handled in the Update handler:
|
||||
- `enable_standard_headers` - nullable bool handler added
|
||||
- `forward_auth_enabled` - regular bool handler added
|
||||
- `waf_disabled` - regular bool handler added
|
||||
|
||||
---
|
||||
|
||||
## Verification Steps
|
||||
|
||||
After enabling standard headers for Seerr:
|
||||
|
||||
### 1. Verify Caddy Config
|
||||
|
||||
```bash
|
||||
docker exec charon cat /app/data/caddy/config.json | python3 -c "
|
||||
import json, sys
|
||||
data = json.load(sys.stdin)
|
||||
routes = data.get('apps', {}).get('http', {}).get('servers', {}).get('charon_server', {}).get('routes', [])
|
||||
for route in routes:
|
||||
for match in route.get('match', []):
|
||||
if any('seerr' in h.lower() for h in match.get('host', [])):
|
||||
print(json.dumps(route, indent=2))
|
||||
"
|
||||
```
|
||||
|
||||
**Expected:** Should show `X-Real-IP`, `X-Forwarded-Proto`, `X-Forwarded-Host`, `X-Forwarded-Port` in the reverse_proxy handler.
|
||||
|
||||
### 2. Test SSO Login
|
||||
|
||||
1. Clear browser cookies for Seerr
|
||||
2. Visit `seerr.hatfieldhosted.com`
|
||||
3. Click "Sign in with Plex"
|
||||
4. Complete OAuth flow
|
||||
5. Should successfully authenticate
|
||||
|
||||
---
|
||||
|
||||
## Files Analyzed
|
||||
|
||||
| File | Status | Notes |
|
||||
|------|--------|-------|
|
||||
| `types.go` | ✅ Correct | `ReverseProxyHandler` properly adds headers when enabled |
|
||||
| `config.go` | ✅ Correct | Properly passes `enableStandardHeaders` parameter |
|
||||
| `proxy_host.go` | ✅ Correct | Field definition is correct |
|
||||
| `proxy_host_handler.go` | ✅ Fixed | Now handles `enable_standard_headers` in Update |
|
||||
| `caddy_config_qa.json` | 📊 Evidence | Shows Seerr route missing standard headers |
|
||||
|
||||
---
|
||||
|
||||
## Conclusion
|
||||
|
||||
**The root cause is a STALE CONFIGURATION caused by a failed or skipped `ApplyConfig()` call.**
|
||||
|
||||
**Evidence:**
|
||||
- Database: `enable_standard_headers = 1`, `updated_at = 2025-12-19 20:58:31` ✅
|
||||
- UI: "Standard Proxy Headers" checkbox is ENABLED ✅
|
||||
- Config Snapshot: Last generated at `2025-12-19 13:57` (7+ hours before the DB update) ❌
|
||||
- Live Caddy Config: Missing `X-Forwarded-Port` header ❌
|
||||
|
||||
**What Happened:**
|
||||
1. User enabled "Standard Proxy Headers" for Seerr on Dec 19 at 20:58
|
||||
2. Database UPDATE succeeded
|
||||
3. `ApplyConfig()` either failed silently or was never called
|
||||
4. The running config is from an older snapshot that predates the update
|
||||
|
||||
**Immediate Action:**
|
||||
```bash
|
||||
docker restart charon
|
||||
```
|
||||
This will force a complete config regeneration from the current database state.
|
||||
|
||||
**Long-term Fixes Needed:**
|
||||
1. Wrap database updates in transactions that rollback on `ApplyConfig()` failure
|
||||
2. Add enhanced logging to track config generation success/failure
|
||||
3. Implement config staleness detection in health checks
|
||||
4. Verify why the older config is missing `X-Forwarded-Port` (possible code version issue)
|
||||
|
||||
**Alternative Immediate Fix (No Restart):**
|
||||
- Make a trivial change to any proxy host in the UI and save
|
||||
- This triggers `ApplyConfig()` and regenerates all configs
|
||||
|
||||
Reference in New Issue
Block a user