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HAProxy

HAProxy is a reverse proxy supported by 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

Configuration

Below you will find commented examples of the following configuration:

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

  1. Add host(s) to the protected-frontends ACL 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 ^(jenkins|nextcloud|phpmyadmin)\.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
    
  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
    
  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
    

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

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
    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 ^(nextcloud)\.example\.com
    acl host-authelia hdr(host) -i auth.example.com
    acl host-nextcloud hdr(host) -i nextcloud.example.com

    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 }
   
    # 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 /api/verify if protected-frontends
   
    # Authelia backend route
    use_backend be_authelia if host-authelia
    # 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 }
    # Service backend route(s)
    use_backend be_nextcloud if host-nextcloud

backend be_authelia
    server authelia authelia:9091

backend be_nextcloud
    # Pass Remote-User 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
    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

    server nextcloud nextcloud: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 ^(nextcloud)\.example\.com
    acl host-authelia hdr(host) -i auth.example.com
    acl host-nextcloud hdr(host) -i nextcloud.example.com

    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 }
   
    # 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
   
    # Authelia backend route
    use_backend be_authelia if host-authelia
    # 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 }
    # Service backend route(s)
    use_backend be_nextcloud if host-nextcloud

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 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
    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

    server nextcloud nextcloud:443 ssl verify none