#
# You can find a documented example of configuration in ./docs/proxies/nginx.md.
#
worker_processes  1;
events {
    worker_connections  1024;
}

http {
    server {
        listen 8080 ssl;
        server_name ~^login\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $frontend_endpoint http://authelia-frontend:3000;
        set $backend_endpoint https://authelia-backend:9091;
        set $metrics_endpoint http://authelia-backend:9959;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Serve the backend API for the portal.
        location /api {
            proxy_set_header  X-Real-IP $remote_addr;

            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /.well-known {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /locales {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /jwks.json {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /metrics {
            proxy_pass        $metrics_endpoint;
        }

        # Serves the portal application.
        location / {
            # Allow websockets for webpack to auto-reload.
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_set_header Host $host:$server_port;

            add_header X-Content-Type-Options "nosniff";
            add_header Referrer-Policy "strict-origin-when-cross-origin";
            add_header X-Frame-Options "DENY";
            add_header Permissions-Policy "accelerometer=(), autoplay=(), camera=(), display-capture=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), xr-spatial-tracking=(), interest-cohort=()";
            add_header X-DNS-Prefetch-Control "off";
            add_header Cross-Origin-Opener-Policy "same-origin";
            add_header Cross-Origin-Embedder-Policy "require-corp";
            add_header Cross-Origin-Resource-Policy "same-origin";

            proxy_pass        $frontend_endpoint;
        }

        # Proxies requests to backend for dev workflow.
        location /devworkflow {
            proxy_pass        $backend_endpoint;
        }
    }

    # Serves the home page.
    server {
        listen 8080 ssl;
        server_name ~^home\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://nginx-backend;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Example configuration of domains protected by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^(public|admin|secure|deny|dev|singlefactor|mx[1-2])(\.mail)?\.(?<basedomain>example([0-9])*\.com)$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_authelia https://authelia-backend:9091/api/authz/auth-request;
        set $upstream_endpoint http://nginx-backend;
        set $upstream_headers http://httpbin:8000/headers;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Content-Type-Options "nosniff";
        add_header Referrer-Policy "strict-origin-when-cross-origin";
        add_header X-Frame-Options "DENY";
        add_header Permissions-Policy "accelerometer=(), autoplay=(), camera=(), display-capture=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), xr-spatial-tracking=(), interest-cohort=()";
        add_header X-DNS-Prefetch-Control "off";
        add_header Cross-Origin-Opener-Policy "same-origin";
        add_header Cross-Origin-Embedder-Policy "require-corp";
        add_header Cross-Origin-Resource-Policy "same-origin";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Reverse proxy to the backend. It is protected by Authelia by forwarding authorization checks
        # to the virtual endpoint introduced by nginx and declared in the next block.
        location / {
            ## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
            auth_request /internal/authelia/authz;

            ## Save the upstream authorization response headers from Authelia to variables.
            auth_request_set $authorization $upstream_http_authorization;
            auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

            ## Inject the authorization response headers from the variables into the request made to the backend.
            proxy_set_header Authorization $authorization;
            proxy_set_header Proxy-Authorization $proxy_authorization;

            ## Save the upstream metadata response headers from Authelia to variables.
            auth_request_set $user $upstream_http_remote_user;
            auth_request_set $groups $upstream_http_remote_groups;
            auth_request_set $name $upstream_http_remote_name;
            auth_request_set $email $upstream_http_remote_email;

            ## Inject the metadata response headers from the variables into the request made to the backend.
            proxy_set_header Remote-User $user;
            proxy_set_header Remote-Groups $groups;
            proxy_set_header Remote-Email $email;
            proxy_set_header Remote-Name $name;

            ## Include the Set-Cookie header if present.
            auth_request_set $cookie $upstream_http_set_cookie;
            add_header Set-Cookie $cookie;

            ## Configure the redirection when the Authz failure occurs. Lines starting with 'Modern Method' and 'Legacy Method'
            ## should be commented / uncommented as pairs. The modern method uses the session cookies configuration's authelia_url
            ## value to determine the redirection URL here. It's much simpler and compatible with the mutli-cookie domain easily.

            ## Modern Method: Set the $redirection_url to the Location header of the response to the Authz endpoint.
            auth_request_set $redirection_url $upstream_http_location;

            ## Modern Method: When there is a 401 response code from the Authz endpoint redirect to the $redirection_url.
            error_page 401 =302 $redirection_url;

            ## Legacy Method: Set $target_url to the original requested URL.
            ## This requires http_set_misc module, replace 'set_escape_uri' with 'set' if you don't have this module.
            # set $target_url $scheme://$http_host$request_uri;

            ## Legacy Method: When there is a 401 response code from the Authz endpoint redirect to the portal with the 'rd'
            ## URL parameter set to $target_url. This requires users update 'auth.example.com/' with their external authelia URL.
            # error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            # Authelia relies on Proxy-Authorization header to authenticate in basic auth.
            # but for the sake of simplicity (because Authorization in supported in most
            # clients) we take Authorization from the frontend and rewrite it to
            # Proxy-Authorization before sending it to Authelia.
            proxy_set_header            Proxy-Authorization $http_authorization;

            # Route the request to the correct virtual host in the backend.
            proxy_set_header            Host $http_host;

            proxy_pass                  $upstream_endpoint;
        }

        # Virtual endpoint forwarding requests to Authelia server.
        location /internal/authelia/authz {
            ## Essential Proxy Configuration
            internal;
            proxy_pass $upstream_authelia;

            # Provide either X-Original-URL and X-Forwarded-Proto or
            # X-Forwarded-Proto, X-Forwarded-Host and X-Forwarded-URI or both.
            # Those headers will be used by Authelia to deduce the target url of the user.
            #
            # X-Forwarded-Proto is mandatory since Authelia uses the "trust proxy" option.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header X-Original-Method $request_method;
            proxy_set_header X-Original-URL    $scheme://$http_host$request_uri;
            proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
            proxy_set_header Content-Length    "";
            proxy_set_header Connection        "";

            # Authelia can receive Proxy-Authorization to authenticate however most of the clients
            # support Authorization instead. Therefore we rewrite Authorization into Proxy-Authorization.
            proxy_set_header            Proxy-Authorization $http_authorization;

            ## Basic Proxy Configuration
            proxy_pass_request_body off;
            proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
            proxy_redirect http:// $scheme://;
            proxy_http_version 1.1;
            proxy_cache_bypass $cookie_session;
            proxy_no_cache $cookie_session;
            proxy_buffers 4 32k;
            client_body_buffer_size 128k;

            ## Advanced Proxy Configuration
            send_timeout 5m;
            proxy_read_timeout 240;
            proxy_send_timeout 240;
            proxy_connect_timeout 240;
        }

        # Used by suites to test the forwarded users and groups headers produced by Authelia.
        location /headers {
            ## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
            auth_request /internal/authelia/authz;

            ## Save the upstream authorization response headers from Authelia to variables.
            auth_request_set $authorization $upstream_http_authorization;
            auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

            ## Inject the authorization response headers from the variables into the request made to the backend.
            proxy_set_header Authorization $authorization;
            proxy_set_header Proxy-Authorization $proxy_authorization;

            ## Save the upstream metadata response headers from Authelia to variables.
            auth_request_set $user $upstream_http_remote_user;
            auth_request_set $groups $upstream_http_remote_groups;
            auth_request_set $name $upstream_http_remote_name;
            auth_request_set $email $upstream_http_remote_email;

            ## Inject the metadata response headers from the variables into the request made to the backend.
            proxy_set_header Remote-User $user;
            proxy_set_header Remote-Groups $groups;
            proxy_set_header Remote-Email $email;
            proxy_set_header Remote-Name $name;

            ## Include the Set-Cookie header if present.
            auth_request_set $cookie $upstream_http_set_cookie;
            add_header Set-Cookie $cookie;

            ## Configure the redirection when the Authz failure occurs. Lines starting with 'Modern Method' and 'Legacy Method'
            ## should be commented / uncommented as pairs. The modern method uses the session cookies configuration's authelia_url
            ## value to determine the redirection URL here. It's much simpler and compatible with the mutli-cookie domain easily.

            ## Modern Method: Set the $redirection_url to the Location header of the response to the Authz endpoint.
            auth_request_set $redirection_url $upstream_http_location;

            ## Modern Method: When there is a 401 response code from the Authz endpoint redirect to the $redirection_url.
            error_page 401 =302 $redirection_url;

            ## Legacy Method: Set $target_url to the original requested URL.
            ## This requires http_set_misc module, replace 'set_escape_uri' with 'set' if you don't have this module.
            # set $target_url $scheme://$http_host$request_uri;

            ## Legacy Method: When there is a 401 response code from the Authz endpoint redirect to the portal with the 'rd'
            ## URL parameter set to $target_url. This requires users update 'auth.example.com/' with their external authelia URL.
            # error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            proxy_pass                  $upstream_headers;
        }
    }

    # Example configuration of domains protected by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^oidc(-public)?\.(?<basedomain>example([0-9])*\.com)$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_authelia https://authelia-backend:9091/api/authz/auth-request;
        set $upstream_endpoint http://oidc-client:8080;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Content-Type-Options "nosniff";
        add_header Referrer-Policy "strict-origin-when-cross-origin";
        add_header X-Frame-Options "DENY";
        add_header Permissions-Policy "accelerometer=(), autoplay=(), camera=(), display-capture=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), screen-wake-lock=(), sync-xhr=(), xr-spatial-tracking=(), interest-cohort=()";
        add_header X-DNS-Prefetch-Control "off";
        add_header Cross-Origin-Opener-Policy "same-origin";
        add_header Cross-Origin-Embedder-Policy "require-corp";
        add_header Cross-Origin-Resource-Policy "same-origin";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Reverse proxy to the backend. It is protected by Authelia by forwarding authorization checks
        # to the virtual endpoint introduced by nginx and declared in the next block.
        location / {
            ## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
            auth_request /internal/authelia/authz;

            ## Save the upstream authorization response headers from Authelia to variables.
            auth_request_set $authorization $upstream_http_authorization;
            auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

            ## Inject the authorization response headers from the variables into the request made to the backend.
            proxy_set_header Authorization $authorization;
            proxy_set_header Proxy-Authorization $proxy_authorization;

            ## Save the upstream metadata response headers from Authelia to variables.
            auth_request_set $user $upstream_http_remote_user;
            auth_request_set $groups $upstream_http_remote_groups;
            auth_request_set $name $upstream_http_remote_name;
            auth_request_set $email $upstream_http_remote_email;

            ## Inject the metadata response headers from the variables into the request made to the backend.
            proxy_set_header Remote-User $user;
            proxy_set_header Remote-Groups $groups;
            proxy_set_header Remote-Email $email;
            proxy_set_header Remote-Name $name;

            ## Include the Set-Cookie header if present.
            auth_request_set $cookie $upstream_http_set_cookie;
            add_header Set-Cookie $cookie;

            ## Configure the redirection when the Authz failure occurs. Lines starting with 'Modern Method' and 'Legacy Method'
            ## should be commented / uncommented as pairs. The modern method uses the session cookies configuration's authelia_url
            ## value to determine the redirection URL here. It's much simpler and compatible with the mutli-cookie domain easily.

            ## Modern Method: Set the $redirection_url to the Location header of the response to the Authz endpoint.
            auth_request_set $redirection_url $upstream_http_location;

            ## Modern Method: When there is a 401 response code from the Authz endpoint redirect to the $redirection_url.
            error_page 401 =302 $redirection_url;

            ## Legacy Method: Set $target_url to the original requested URL.
            ## This requires http_set_misc module, replace 'set_escape_uri' with 'set' if you don't have this module.
            # set $target_url $scheme://$http_host$request_uri;

            ## Legacy Method: When there is a 401 response code from the Authz endpoint redirect to the portal with the 'rd'
            ## URL parameter set to $target_url. This requires users update 'auth.example.com/' with their external authelia URL.
            # error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            # Route the request to the correct virtual host in the backend.
            proxy_set_header            Host $http_host;

            proxy_pass                  $upstream_endpoint;
        }

        # Virtual endpoint forwarding requests to Authelia server.
        location /internal/authelia/authz {
            ## Essential Proxy Configuration
            internal;
            proxy_pass $upstream_authelia;

            # Provide either X-Original-URL and X-Forwarded-Proto or
            # X-Forwarded-Proto, X-Forwarded-Host and X-Forwarded-URI or both.
            # Those headers will be used by Authelia to deduce the target url of the user.
            #
            # X-Forwarded-Proto is mandatory since Authelia uses the "trust proxy" option.
            proxy_set_header X-Original-Method $request_method;
            proxy_set_header X-Original-URL    $scheme://$http_host$request_uri;
            proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
            proxy_set_header Content-Length    "";
            proxy_set_header Connection        "";

            # Authelia can receive Proxy-Authorization to authenticate however most of the clients
            # support Authorization instead. Therefore we rewrite Authorization into Proxy-Authorization.
            proxy_set_header            Proxy-Authorization $http_authorization;

            ## Basic Proxy Configuration
            proxy_pass_request_body off;
            proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
            proxy_redirect http:// $scheme://;
            proxy_http_version 1.1;
            proxy_cache_bypass $cookie_session;
            proxy_no_cache $cookie_session;
            proxy_buffers 4 32k;
            client_body_buffer_size 128k;

            ## Advanced Proxy Configuration
            send_timeout 5m;
            proxy_read_timeout 240;
            proxy_send_timeout 240;
            proxy_connect_timeout 240;
        }
    }

    # Fake Web Mail used to receive emails sent by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^mail\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://smtp:1080;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Fake API emulating Duo behavior
    server {
        listen 443 ssl;
        server_name ~^duo\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://duo-api:3000;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Matches all domains. It redirects to the home page.
    server {
        listen 8080 ssl;
        server_name _;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        return 301 https://home.example.com:8080/;
    }
}
