525e1b170d
- Updated sidebar positions across multiple documentation files for improved navigation and logical grouping. - Revised HAProxy stats configuration to require `HAPROXY_PASSWORD` for enabling statistics. - Clarified environment variable descriptions and usage in `environment-variable.md`.
309 lines
14 KiB
Markdown
309 lines
14 KiB
Markdown
---
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sidebar_position: 16
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---
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# JWT Validator Plugin
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**Type:** Domain Plugin
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**Runs:** Once for each discovered domain/host
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## Overview
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The JWT Validator plugin validates JWT (JSON Web Token) authentication tokens using HAProxy's built-in JWT functionality.
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## Why Use It
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Protect APIs and services with JWT authentication without needing application-level code.
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## Generating JWT Keys
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```bash
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# Generate RSA key pair (idempotent - skips if exists)
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[ -f jwt_private.pem ] || openssl genrsa -out jwt_private.pem 2048
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[ -f jwt_pubkey.pem ] || openssl rsa -in jwt_private.pem -pubout -out jwt_pubkey.pem
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```
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## Configuration Options
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| Option | Description | Default |
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|-------------------|----------------------------------------------------------------------------------------------|-------------|
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| `enabled` | Enable/disable plugin | `true` |
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| `algorithm` | JWT signing algorithm | `RS256` |
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| `issuer` | Expected JWT issuer (optional, set to `none`/`null` to skip validation) | (optional) |
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| `audience` | Expected JWT audience (optional, set to `none`/`null` to skip validation) | (optional) |
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| `pubkey_path` | Path to public key file (required if `pubkey` not provided) | (required) |
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| `pubkey` | Public key content as base64-encoded string (required if `pubkey_path` not provided) | (optional) |
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| `paths` | List of paths that require JWT validation (optional) | (all paths) |
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| `only_paths` | If `true`, only specified paths are accessible; if `false`, only specified paths require JWT | `false` |
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| `allow_anonymous` | If `true`, allows requests without Authorization header (validates JWT if present) | `false` |
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## Path Validation Logic
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- **No paths configured:** ALL requests to the domain require JWT validation (default behavior)
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- **Paths configured + `only_paths=false`:** Only specified paths require JWT validation, other paths pass through without validation
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- **Paths configured + `only_paths=true`:** Only specified paths are accessible (with JWT validation), all other paths are denied
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## Anonymous Access Logic
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- **`allow_anonymous=false` (default):** Requests without `Authorization` header are denied with "Missing Authorization HTTP header"
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- **`allow_anonymous=true`:** Requests without `Authorization` header are allowed to pass through, but JWTs are validated if the header is present
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**Use Cases for `allow_anonymous=true`:**
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- Optional authentication (show different content for authenticated vs anonymous users)
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- Mixed public/private content where some users have enhanced access with JWT
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- Gradual JWT authentication rollout
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- Public APIs that provide additional features to authenticated users
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## Configuration Examples
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### Docker/Docker Compose (Protect All Paths)
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```yaml
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services:
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api:
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labels:
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easyhaproxy.http.host: api.example.com
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easyhaproxy.http.plugins: jwt_validator
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easyhaproxy.http.plugin.jwt_validator.algorithm: RS256
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easyhaproxy.http.plugin.jwt_validator.issuer: https://auth.example.com/
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easyhaproxy.http.plugin.jwt_validator.audience: https://api.example.com
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easyhaproxy.http.plugin.jwt_validator.pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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volumes:
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- ./pubkey.pem:/etc/haproxy/jwt_keys/api_pubkey.pem:ro
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```
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### Protect Specific Paths Only
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```yaml
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labels:
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easyhaproxy.http.plugins: jwt_validator
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easyhaproxy.http.plugin.jwt_validator.pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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easyhaproxy.http.plugin.jwt_validator.paths: /api/admin,/api/sensitive
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easyhaproxy.http.plugin.jwt_validator.only_paths: false
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# /api/health, /api/docs, etc. remain publicly accessible
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```
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### Only Allow Specific Paths
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```yaml
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labels:
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easyhaproxy.http.plugins: jwt_validator
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easyhaproxy.http.plugin.jwt_validator.pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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easyhaproxy.http.plugin.jwt_validator.paths: /api/public,/api/v1
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easyhaproxy.http.plugin.jwt_validator.only_paths: true
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# All paths except /api/public and /api/v1 are denied
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```
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### Skip Issuer/Audience Validation
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```yaml
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labels:
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easyhaproxy.http.plugin.jwt_validator.issuer: none
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easyhaproxy.http.plugin.jwt_validator.audience: none
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easyhaproxy.http.plugin.jwt_validator.pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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```
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### Allow Anonymous Access (Optional JWT)
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```yaml
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services:
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api:
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labels:
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easyhaproxy.http.host: api.example.com
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easyhaproxy.http.plugins: jwt_validator
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easyhaproxy.http.plugin.jwt_validator.pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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easyhaproxy.http.plugin.jwt_validator.allow_anonymous: true
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volumes:
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- ./pubkey.pem:/etc/haproxy/jwt_keys/api_pubkey.pem:ro
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# Requests without Authorization header are allowed
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# Requests with Authorization header are validated
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# Invalid JWTs are rejected
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```
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### Kubernetes Annotations
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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annotations:
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easyhaproxy.plugins: "jwt_validator"
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easyhaproxy.plugin.jwt_validator.algorithm: "RS256"
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easyhaproxy.plugin.jwt_validator.issuer: "https://auth.example.com/"
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easyhaproxy.plugin.jwt_validator.audience: "https://api.example.com"
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easyhaproxy.plugin.jwt_validator.pubkey_path: "/etc/haproxy/jwt_keys/api_pubkey.pem"
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easyhaproxy.plugin.jwt_validator.paths: "/api/admin,/api/users"
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easyhaproxy.plugin.jwt_validator.only_paths: "false"
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spec:
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rules:
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- host: api.example.com
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http:
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paths:
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- path: /
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backend:
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service:
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name: api-service
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port:
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number: 8080
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```
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### Static YAML Configuration
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```yaml
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# /etc/haproxy/static/config.yaml
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easymapping:
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- host: api.example.com
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port: 443
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container: api-service:8080
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plugins:
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- jwt_validator
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plugin_config:
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jwt_validator:
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algorithm: RS256
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issuer: https://auth.example.com/
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audience: https://api.example.com
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pubkey_path: /etc/haproxy/jwt_keys/api_pubkey.pem
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```
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### Environment Variables
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Configure JWT Validator plugin defaults for all domains:
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| Environment Variable | Config Key | Type | Default | Description |
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|----------------------------------------------------|-------------------|---------|---------|---------------------------------------------|
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_ENABLED` | `enabled` | boolean | `true` | Enable/disable plugin for all domains |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_ALGORITHM` | `algorithm` | string | `RS256` | JWT signing algorithm |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_ISSUER` | `issuer` | string | - | Expected JWT issuer (optional) |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_AUDIENCE` | `audience` | string | - | Expected JWT audience (optional) |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_PUBKEY_PATH` | `pubkey_path` | string | - | Path to public key file |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_PUBKEY` | `pubkey` | string | - | Public key as base64-encoded string |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_PATHS` | `paths` | string | - | Comma-separated paths requiring JWT |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_ONLY_PATHS` | `only_paths` | boolean | `false` | If true, only specified paths accessible |
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| `EASYHAPROXY_PLUGIN_JWT_VALIDATOR_ALLOW_ANONYMOUS` | `allow_anonymous` | boolean | `false` | Allow requests without Authorization header |
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**Note:** Environment variables set defaults for ALL domains. To configure per-domain, use container labels or Kubernetes annotations.
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## Generated HAProxy Configuration
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### All Paths Protected
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```haproxy
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# JWT Validator - Validate JWT tokens
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http-request deny content-type 'text/html' string 'Missing Authorization HTTP header' unless { req.hdr(authorization) -m found }
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# Extract JWT header and payload
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http-request set-var(txn.alg) http_auth_bearer,jwt_header_query('$.alg')
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http-request set-var(txn.iss) http_auth_bearer,jwt_payload_query('$.iss')
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http-request set-var(txn.aud) http_auth_bearer,jwt_payload_query('$.aud')
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http-request set-var(txn.exp) http_auth_bearer,jwt_payload_query('$.exp','int')
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# Validate JWT
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http-request deny content-type 'text/html' string 'Unsupported JWT signing algorithm' unless { var(txn.alg) -m str RS256 }
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http-request deny content-type 'text/html' string 'Invalid JWT issuer' unless { var(txn.iss) -m str https://auth.example.com/ }
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http-request deny content-type 'text/html' string 'Invalid JWT audience' unless { var(txn.aud) -m str https://api.example.com }
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http-request deny content-type 'text/html' string 'Invalid JWT signature' unless { http_auth_bearer,jwt_verify(txn.alg,"/etc/haproxy/jwt_keys/api_pubkey.pem") -m int 1 }
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# Validate expiration
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http-request set-var(txn.now) date()
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http-request deny content-type 'text/html' string 'JWT has expired' if { var(txn.exp),sub(txn.now) -m int lt 0 }
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```
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### Specific Paths Only (only_paths=false)
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```haproxy
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# JWT Validator - Validate JWT tokens
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# Define paths that require JWT validation
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acl jwt_protected_path path_beg /api/admin
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acl jwt_protected_path path_beg /api/sensitive
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http-request deny content-type 'text/html' string 'Missing Authorization HTTP header' unless { req.hdr(authorization) -m found } if jwt_protected_path
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# Extract JWT header and payload
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http-request set-var(txn.alg) http_auth_bearer,jwt_header_query('$.alg') if jwt_protected_path
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http-request set-var(txn.iss) http_auth_bearer,jwt_payload_query('$.iss') if jwt_protected_path
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http-request set-var(txn.aud) http_auth_bearer,jwt_payload_query('$.aud') if jwt_protected_path
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http-request set-var(txn.exp) http_auth_bearer,jwt_payload_query('$.exp','int') if jwt_protected_path
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# Validate JWT (only on protected paths)
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http-request deny content-type 'text/html' string 'Unsupported JWT signing algorithm' unless { var(txn.alg) -m str RS256 } if jwt_protected_path
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http-request deny content-type 'text/html' string 'Invalid JWT signature' unless { http_auth_bearer,jwt_verify(txn.alg,"/etc/haproxy/jwt_keys/api_pubkey.pem") -m int 1 } if jwt_protected_path
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# Validate expiration
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http-request set-var(txn.now) date() if jwt_protected_path
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http-request deny content-type 'text/html' string 'JWT has expired' if { var(txn.exp),sub(txn.now) -m int lt 0 } if jwt_protected_path
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```
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### Specific Paths Only (only_paths=true)
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```haproxy
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# JWT Validator - Validate JWT tokens
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# Define paths that require JWT validation
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acl jwt_protected_path path_beg /api/public
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acl jwt_protected_path path_beg /api/v1
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# Deny access to paths not in the protected list
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http-request deny content-type 'text/html' string 'Access denied' unless jwt_protected_path
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http-request deny content-type 'text/html' string 'Missing Authorization HTTP header' unless { req.hdr(authorization) -m found }
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# Extract JWT header and payload
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http-request set-var(txn.alg) http_auth_bearer,jwt_header_query('$.alg')
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http-request set-var(txn.iss) http_auth_bearer,jwt_payload_query('$.iss')
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http-request set-var(txn.aud) http_auth_bearer,jwt_payload_query('$.aud')
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http-request set-var(txn.exp) http_auth_bearer,jwt_payload_query('$.exp','int')
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# Validate JWT (all requests at this point are on allowed paths)
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http-request deny content-type 'text/html' string 'Unsupported JWT signing algorithm' unless { var(txn.alg) -m str RS256 }
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http-request deny content-type 'text/html' string 'Invalid JWT signature' unless { http_auth_bearer,jwt_verify(txn.alg,"/etc/haproxy/jwt_keys/api_pubkey.pem") -m int 1 }
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# Validate expiration
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http-request set-var(txn.now) date()
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http-request deny content-type 'text/html' string 'JWT has expired' if { var(txn.exp),sub(txn.now) -m int lt 0 }
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```
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### Allow Anonymous Access (allow_anonymous=true)
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```haproxy
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# JWT Validator - Validate JWT tokens
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# Allow anonymous access - validate JWT only if Authorization header is present
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# Extract JWT header and payload
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http-request set-var(txn.alg) http_auth_bearer,jwt_header_query('$.alg') if { req.hdr(authorization) -m found }
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http-request set-var(txn.iss) http_auth_bearer,jwt_payload_query('$.iss') if { req.hdr(authorization) -m found }
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http-request set-var(txn.aud) http_auth_bearer,jwt_payload_query('$.aud') if { req.hdr(authorization) -m found }
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http-request set-var(txn.exp) http_auth_bearer,jwt_payload_query('$.exp','int') if { req.hdr(authorization) -m found }
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# Validate JWT (only if Authorization header is present)
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http-request deny content-type 'text/html' string 'Unsupported JWT signing algorithm' unless { var(txn.alg) -m str RS256 } if { req.hdr(authorization) -m found }
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http-request deny content-type 'text/html' string 'Invalid JWT issuer' unless { var(txn.iss) -m str https://auth.example.com/ } if { req.hdr(authorization) -m found }
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http-request deny content-type 'text/html' string 'Invalid JWT audience' unless { var(txn.aud) -m str https://api.example.com } if { req.hdr(authorization) -m found }
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http-request deny content-type 'text/html' string 'Invalid JWT signature' unless { http_auth_bearer,jwt_verify(txn.alg,"/etc/haproxy/jwt_keys/api_pubkey.pem") -m int 1 } if { req.hdr(authorization) -m found }
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# Validate expiration (only if Authorization header is present)
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http-request set-var(txn.now) date() if { req.hdr(authorization) -m found }
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http-request deny content-type 'text/html' string 'JWT has expired' if { var(txn.exp),sub(txn.now) -m int lt 0 } if { req.hdr(authorization) -m found }
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```
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## What It Validates
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- ✅ Authorization header presence
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- ✅ JWT signing algorithm (RS256, RS512, etc.)
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- ✅ JWT issuer (if configured)
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- ✅ JWT audience (if configured)
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- ✅ JWT signature using public key
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- ✅ JWT expiration time
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## Important Notes
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- **Required:** HAProxy 2.5+ with JWT support
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- Mount public key file as read-only volume
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- The plugin runs once per domain during the discovery cycle
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- Test thoroughly with your JWT provider before deploying to production
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## Related Documentation
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- [Plugin System Overview](../plugins.md)
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- [Container Labels Reference](../container-labels.md)
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