HAProxy

A guide on integrating Authelia with the HAProxy reverse proxy.

HAProxy is a reverse proxy supported by Authelia.

Important: When using these guides it’s important to recognize that we cannot provide a guide for every possible method of deploying a proxy. These guides show a suggested setup only and you need to understand the proxy configuration and customize it to your needs. To-that-end we include links to the official proxy documentation throughout this documentation and in the See Also section.

Get Started

It’s strongly recommended that users setting up Authelia for the first time take a look at our Get Started guide. This takes you through various steps which are essential to bootstrapping Authelia.

Requirements

You need the following to run Authelia with HAProxy:

  • HAProxy 1.8.4+ (2.2.0+ recommended) -USE_LUA=1 set at compile time
    • haproxy-lua-http must be available within the Lua path
      • A json library within the Lua path (dependency of haproxy-lua-http, usually found as OS package lua-json)
      • With HAProxy 2.1.3+ you can use the lua-prepend-path configuration option to specify the search path
    • haproxy-auth-request

Trusted Proxies

Important: You should read the Forwarded Headers section and this section as part of any proxy configuration. Especially if you have never read it before.

Important: The included example is NOT meant for production use. It’s used expressly as an example to showcase how you can configure multiple IP ranges. You should customize this example to fit your specific architecture and needs. You should only include the specific IP address ranges of the trusted proxies within your architecture and should not trust entire subnets unless that subnet only has trusted proxies and no other services.

With HAProxy the most convenient method to configure trusted proxies is to create a src ACL from the contents of a file. The example utilizes this method and trusted proxies can then easily be added or removed from the ACL file.

HAProxy implicitly trusts all external proxies by default so it’s important you configure this for a trusted environment.

HAProxy by default does trust all other proxies. This means it’s essential that you configure this correctly.

In the example we have a trusted_proxies.src.acl file which is used by one http-request del-header X-Forwarded-For line in the main configuration which shows an example of not trusting any proxies or alternatively an example on adding the following networks to the trusted proxy list in HAProxy:

  • 10.0.0.0/8
  • 172.16.0.0/16
  • 192.168.0.0/16
  • fc00::/7

Configuration

Below you will find commented examples of the following configuration:

  • Authelia Portal
  • Protected Endpoint (Nextcloud)
  • Protected Endpoint with Authorization header for basic authentication (Heimdall)

With this configuration you can protect your virtual hosts with Authelia, by following the steps below:

  1. Add host(s) to the protected-frontends or protected-frontends-basic ACLs to support protection with Authelia. You can separate each subdomain with a | in the regex, for example:

    acl protected-frontends hdr(host) -m reg -i ^(?i)(jenkins|nextcloud|phpmyadmin)\.example\.com
    acl protected-frontends-basic hdr(host) -m reg -i ^(?i)(heimdall)\.example\.com
    
  2. Add host ACL(s) in the form of host-service, this will be utilised to route to the correct backend upon successful authentication, for example:

    acl host-jenkins hdr(host) -i jenkins.example.com
    acl host-nextcloud hdr(host) -i nextcloud.example.com
    acl host-phpmyadmin hdr(host) -i phpmyadmin.example.com
    acl host-heimdall hdr(host) -i heimdall.example.com
    
  3. Add backend route for your service(s), for example:

    use_backend be_jenkins if host-jenkins
    use_backend be_nextcloud if host-nextcloud
    use_backend be_phpmyadmin if host-phpmyadmin
    use_backend be_heimdall if host-heimdall
    
  4. Add backend definitions for your service(s), for example:

    backend be_jenkins
        server jenkins jenkins:8080
    backend be_nextcloud
        server nextcloud nextcloud:443 ssl verify none
    backend be_phpmyadmin
        server phpmyadmin phpmyadmin:80
    backend be_heimdall
        server heimdall heimdall:443 ssl verify none
    

Secure Authelia with TLS

There is a known limitation with haproxy-auth-request with regard to TLS-enabled backends. If you want to run Authelia TLS enabled the recommended workaround utilises HAProxy itself to proxy the requests. This comes at a cost of two additional TCP connections, but allows the full HAProxy configuration flexibility with regard to TLS verification as well as header rewriting. An example of this configuration is also be provided below.

Configuration

trusted_proxies.src.acl
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
fc00::/7
haproxy.cfg
global
    # Path to haproxy-lua-http, below example assumes /usr/local/etc/haproxy/haproxy-lua-http/http.lua
    lua-prepend-path /usr/local/etc/haproxy/?/http.lua
    # Path to haproxy-auth-request
    lua-load /usr/local/etc/haproxy/auth-request.lua
    log stdout format raw local0 debug

defaults
    mode http
    log global
    option httplog

frontend fe_http
    bind *:443 ssl crt example.com.pem

    ## Trusted Proxies.
    http-request del-header X-Forwarded-For

    ## Comment the above directive and the two directives below to enable the trusted proxies ACL.
    # acl src-trusted_proxies src -f trusted_proxies.src.acl
    # http-request del-header X-Forwarded-For if !src-trusted_proxies

    ## Ensure X-Forwarded-For is set for the auth request.
    acl hdr-xff_exists req.hdr(X-Forwarded-For) -m found
    http-request set-header X-Forwarded-For %[src] if !hdr-xff_exists
    option forwardfor

    # Host ACLs
    acl protected-frontends hdr(host) -m reg -i ^(?i)(nextcloud)\.example\.com
    acl protected-frontends-basic hdr(host) -m reg -i ^(?i)(heimdall)\.example\.com
    acl host-authelia hdr(host) -i auth.example.com
    acl host-nextcloud hdr(host) -i nextcloud.example.com
    acl host-heimdall hdr(host) -i heimdall.example.com

    # This is required if utilising basic auth with /api/verify?auth=basic
    http-request set-var(txn.host) hdr(Host)

    http-request set-var(req.scheme) str(https) if { ssl_fc }
    http-request set-var(req.scheme) str(http) if !{ ssl_fc }
    http-request set-var(req.questionmark) str(?) if { query -m found }

    # These are optional if you wish to use the Methods rule in the access_control section.
    #http-request set-var(req.method) str(CONNECT) if { method CONNECT }
    #http-request set-var(req.method) str(GET) if { method GET }
    #http-request set-var(req.method) str(HEAD) if { method HEAD }
    #http-request set-var(req.method) str(OPTIONS) if { method OPTIONS }
    #http-request set-var(req.method) str(POST) if { method POST }
    #http-request set-var(req.method) str(TRACE) if { method TRACE }
    #http-request set-var(req.method) str(PUT) if { method PUT }
    #http-request set-var(req.method) str(PATCH) if { method PATCH }
    #http-request set-var(req.method) str(DELETE) if { method DELETE }
    #http-request set-header X-Forwarded-Method %[var(req.method)]

    # Required headers
    http-request set-header X-Real-IP %[src]
    http-request set-header X-Forwarded-Method %[var(req.method)]
    http-request set-header X-Forwarded-Proto %[var(req.scheme)]
    http-request set-header X-Forwarded-Host %[req.hdr(Host)]
    http-request set-header X-Forwarded-Uri %[path]%[var(req.questionmark)]%[query]

    # Protect endpoints with haproxy-auth-request and Authelia
    http-request lua.auth-request be_authelia /api/verify if protected-frontends
    # Force `Authorization` header via query arg to /api/verify
    http-request lua.auth-request be_authelia /api/verify?auth=basic if protected-frontends-basic

    # Respond protected-frontends with a forbidden message if forbidden in Authelia.
    http-request deny if protected-frontends !{ var(txn.auth_response_successful) -m bool } { var(txn.auth_response_code) -m int 403 }

    # Redirect protected-frontends to Authelia if not authenticated
    http-request redirect location https://auth.example.com/?rd=%[var(req.scheme)]://%[base]%[var(req.questionmark)]%[query] if protected-frontends !{ var(txn.auth_response_successful) -m bool }

    # Send 401 and pass `WWW-Authenticate` header on protected-frontend-basic if not pre-authenticated
    http-request set-var(txn.auth) var(req.auth_response_header.www_authenticate) if protected-frontends-basic !{ var(txn.auth_response_successful) -m bool }
    http-response deny deny_status 401 hdr WWW-Authenticate %[var(txn.auth)] if { var(txn.host) -m reg -i ^(?i)(heimdall)\.example\.com } !{ var(txn.auth_response_successful) -m bool }

    # Authelia backend route
    use_backend be_authelia if host-authelia

    # Service backend route(s)
    use_backend be_nextcloud if host-nextcloud
    use_backend be_heimdall if host-heimdall

backend be_authelia
    server authelia authelia:9091

backend be_nextcloud
    # Pass Remote-User, Remote-Name, Remote-Email and Remote-Groups headers
    acl remote_user_exist var(req.auth_response_header.remote_user) -m found
    acl remote_groups_exist var(req.auth_response_header.remote_groups) -m found
    acl remote_name_exist var(req.auth_response_header.remote_name) -m found
    acl remote_email_exist var(req.auth_response_header.remote_email) -m found
    http-request set-header Remote-User %[var(req.auth_response_header.remote_user)] if remote_user_exist
    http-request set-header Remote-Groups %[var(req.auth_response_header.remote_groups)] if remote_groups_exist
    http-request set-header Remote-Name %[var(req.auth_response_header.remote_name)] if remote_name_exist
    http-request set-header Remote-Email %[var(req.auth_response_header.remote_email)] if remote_email_exist

    server nextcloud nextcloud:443 ssl verify none

backend be_heimdall
    # Pass Remote-User, Remote-Name, Remote-Email and Remote-Groups headers
    acl remote_user_exist var(req.auth_response_header.remote_user) -m found
    acl remote_groups_exist var(req.auth_response_header.remote_groups) -m found
    acl remote_name_exist var(req.auth_response_header.remote_name) -m found
    acl remote_email_exist var(req.auth_response_header.remote_email) -m found
    http-request set-header Remote-User %[var(req.auth_response_header.remote_user)] if remote_user_exist
    http-request set-header Remote-Groups %[var(req.auth_response_header.remote_groups)] if remote_groups_exist
    http-request set-header Remote-Name %[var(req.auth_response_header.remote_name)] if remote_name_exist
    http-request set-header Remote-Email %[var(req.auth_response_header.remote_email)] if remote_email_exist

    server heimdall heimdall:443 ssl verify none
haproxy.cfg (TLS enabled Authelia)
global
    # Path to haproxy-lua-http, below example assumes /usr/local/etc/haproxy/haproxy-lua-http/http.lua
    lua-prepend-path /usr/local/etc/haproxy/?/http.lua
    # Path to haproxy-auth-request
    lua-load /usr/local/etc/haproxy/auth-request.lua
    log stdout format raw local0 debug

defaults
    mode http
    log global
    option httplog
    option forwardfor

frontend fe_http
    bind *:443 ssl crt /usr/local/etc/haproxy/haproxy.pem

    # Host ACLs
    acl protected-frontends hdr(host) -m reg -i ^(?i)(nextcloud)\.example\.com
    acl protected-frontends-basic hdr(host) -m reg -i ^(?i)(heimdall)\.example\.com
    acl host-authelia hdr(host) -i auth.example.com
    acl host-nextcloud hdr(host) -i nextcloud.example.com
    acl host-heimdall hdr(host) -i heimdall.example.com

    # This is required if utilising basic auth with /api/verify?auth=basic
    http-request set-var(txn.host) hdr(Host)

    http-request set-var(req.scheme) str(https) if { ssl_fc }
    http-request set-var(req.scheme) str(http) if !{ ssl_fc }
    http-request set-var(req.questionmark) str(?) if { query -m found }

    # These are optional if you wish to use the Methods rule in the access_control section.
    #http-request set-var(req.method) str(CONNECT) if { method CONNECT }
    #http-request set-var(req.method) str(GET) if { method GET }
    #http-request set-var(req.method) str(HEAD) if { method HEAD }
    #http-request set-var(req.method) str(OPTIONS) if { method OPTIONS }
    #http-request set-var(req.method) str(POST) if { method POST }
    #http-request set-var(req.method) str(TRACE) if { method TRACE }
    #http-request set-var(req.method) str(PUT) if { method PUT }
    #http-request set-var(req.method) str(PATCH) if { method PATCH }
    #http-request set-var(req.method) str(DELETE) if { method DELETE }
    #http-request set-header X-Forwarded-Method %[var(req.method)]

    # Required headers
    http-request set-header X-Real-IP %[src]
    http-request set-header X-Forwarded-Proto %[var(req.scheme)]
    http-request set-header X-Forwarded-Host %[req.hdr(Host)]
    http-request set-header X-Forwarded-Uri %[path]%[var(req.questionmark)]%[query]

    # Protect endpoints with haproxy-auth-request and Authelia
    http-request lua.auth-request be_authelia_proxy /api/verify if protected-frontends
    # Force `Authorization` header via query arg to /api/verify
    http-request lua.auth-request be_authelia_proxy /api/verify?auth=basic if protected-frontends-basic

    # Respond protected-frontends with a forbidden message if forbidden in Authelia.
    http-request deny if protected-frontends !{ var(txn.auth_response_successful) -m bool } { var(txn.auth_response_code) -m int 403 }

    # Redirect protected-frontends to Authelia if not authenticated
    http-request redirect location https://auth.example.com/?rd=%[var(req.scheme)]://%[base]%[var(req.questionmark)]%[query] if protected-frontends !{ var(txn.auth_response_successful) -m bool }
    # Send 401 and pass `WWW-Authenticate` header on protected-frontend-basic if not pre-authenticated

    # Send 401 and pass `WWW-Authenticate` header on protected-frontend-basic if not pre-authenticated
    http-request set-var(txn.auth) var(req.auth_response_header.www_authenticate) if protected-frontends-basic !{ var(txn.auth_response_successful) -m bool }
    http-response deny deny_status 401 hdr WWW-Authenticate %[var(txn.auth)] if { var(txn.host) -m reg -i ^(?i)(heimdall)\.example\.com } !{ var(txn.auth_response_successful) -m bool }

    # Authelia backend route
    use_backend be_authelia if host-authelia

    # Service backend route(s)
    use_backend be_nextcloud if host-nextcloud
    use_backend be_heimdall if host-heimdall

backend be_authelia
    server authelia authelia:9091

backend be_authelia_proxy
    mode http
    server proxy 127.0.0.1:9092

listen authelia_proxy
    mode http
    bind 127.0.0.1:9092
    server authelia authelia:9091 ssl verify none

backend be_nextcloud
    # Pass Remote-User, Remote-Name, Remote-Email and Remote-Groups headers
    acl remote_user_exist var(req.auth_response_header.remote_user) -m found
    acl remote_groups_exist var(req.auth_response_header.remote_groups) -m found
    acl remote_name_exist var(req.auth_response_header.remote_name) -m found
    acl remote_email_exist var(req.auth_response_header.remote_email) -m found
    http-request set-header Remote-User %[var(req.auth_response_header.remote_user)] if remote_user_exist
    http-request set-header Remote-Groups %[var(req.auth_response_header.remote_groups)] if remote_groups_exist
    http-request set-header Remote-Name %[var(req.auth_response_header.remote_name)] if remote_name_exist
    http-request set-header Remote-Email %[var(req.auth_response_header.remote_email)] if remote_email_exist

    server nextcloud nextcloud:443 ssl verify none

backend be_heimdall
    # Pass Remote-User, Remote-Name, Remote-Email and Remote-Groups headers
    acl remote_user_exist var(req.auth_response_header.remote_user) -m found
    acl remote_groups_exist var(req.auth_response_header.remote_groups) -m found
    acl remote_name_exist var(req.auth_response_header.remote_name) -m found
    acl remote_email_exist var(req.auth_response_header.remote_email) -m found
    http-request set-header Remote-User %[var(req.auth_response_header.remote_user)] if remote_user_exist
    http-request set-header Remote-Groups %[var(req.auth_response_header.remote_groups)] if remote_groups_exist
    http-request set-header Remote-Name %[var(req.auth_response_header.remote_name)] if remote_name_exist
    http-request set-header Remote-Email %[var(req.auth_response_header.remote_email)] if remote_email_exist

    server heimdall heimdall:443 ssl verify none

See Also