Shibboleth integration

## GitLab
## Modified from https://gitlab.com/gitlab-org/gitlab-foss/blob/master/lib/support/nginx/gitlab-ssl & https://gitlab.com/gitlab-org/gitlab-foss/blob/master/lib/support/nginx/gitlab
##
## Lines starting with two hashes (##) are comments with information.
## Lines starting with one hash (#) are configuration parameters that can be uncommented.
##
##################################
##        CHUNKED TRANSFER      ##
##################################
##
## It is a known issue that Git-over-HTTP requires chunked transfer encoding [0]
## which is not supported by Nginx < 1.3.9 [1]. As a result, pushing a large object
## with Git (i.e. a single large file) can lead to a 411 error. In theory you can get
## around this by tweaking this configuration file and either:
## - installing an old version of Nginx with the chunkin module [2] compiled in, or
## - using a newer version of Nginx.
##
## At the time of writing we do not know if either of these theoretical solutions works.
## As a workaround users can use Git over SSH to push large files.
##
## [0] https://git.kernel.org/cgit/git/git.git/tree/Documentation/technical/http-protocol.txt#n99
## [1] https://github.com/agentzh/chunkin-nginx-module#status
## [2] https://github.com/agentzh/chunkin-nginx-module
##
###################################
##         configuration         ##
###################################

upstream gitlab-workhorse {
  server <%= "unix:" if node['gitlab']['gitlab-workhorse']['listen_network'] == "unix" %><%= node['gitlab']['gitlab-workhorse']['listen_addr'] %>;
}

<% if @https && @redirect_http_to_https %>
## Redirects all HTTP traffic to the HTTPS host
server {
<% @listen_addresses.each do |listen_address| %>
  listen <%= listen_address %>:<%= @redirect_http_to_https_port %>;
<% end %>

  server_name <%= @fqdn %>;
  server_tokens off; ## Don't show the nginx version number, a security best practice

  <% if @letsencrypt_enable %>
  location /.well-known {
    root <%= @dir %>/www/;
  }
  <% end %>

  location / {
    return 301 https://<%= @fqdn %>:<%= @port %>$request_uri;
  }

  # health checks configuration
  include <%= @gitlab_health_conf %>;

  access_log  <%= @log_directory %>/gitlab_access.log gitlab_access;
  error_log   <%= @log_directory %>/gitlab_error.log;
}
<% end %>

server {
<% @listen_addresses.each do |listen_address| %>
  listen <%= listen_address %>:<%= @listen_port %><% if @https %> ssl<% if @http2_enabled %> http2<% end %><% end %>;

  <% if @kerberos_enabled && @kerberos_use_dedicated_port %>
  listen <%= listen_address %>:<%= @kerberos_port %><% if @kerberos_https %> ssl<% end %>;
  <% end %>

<% end %>
  server_name <%= @fqdn %>;
  server_tokens off; ## Don't show the nginx version number, a security best practice

  ## Increase this if you want to upload large attachments
  ## Or if you want to accept large git objects over http
  client_max_body_size <%= @client_max_body_size %>;

  <% if @https %>
  ## Strong SSL Security
  ## https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html & https://cipherli.st/
  ssl_certificate <%= @ssl_certificate %>;
  ssl_certificate_key <%= @ssl_certificate_key %>;
  <% if @ssl_client_certificate %>
  ssl_client_certificate <%= @ssl_client_certificate%>;
  <% end %>
  <% if @ssl_verify_client %>
  ssl_verify_client <%= @ssl_verify_client%>;
  ssl_verify_depth <%= @ssl_verify_depth%>;
  <% end %>

  # GitLab needs backwards compatible ciphers to retain compatibility with Java IDEs
  ssl_ciphers '<%= @ssl_ciphers %>';
  ssl_protocols  <%= @ssl_protocols %>;
  ssl_prefer_server_ciphers <%= @ssl_prefer_server_ciphers %>;
  ssl_session_cache  <%= @ssl_session_cache %>;
  ssl_session_timeout  <%= @ssl_session_timeout %>;

  <% if @ssl_dhparam %>
  ssl_dhparam <%= @ssl_dhparam %>;
  <% end %>
  <% end %>

  ## Real IP Module Config
  ## http://nginx.org/en/docs/http/ngx_http_realip_module.html
  <% if @real_ip_header %>
  real_ip_header <%= @real_ip_header %>;
  <% end %>
  <% if @real_ip_recursive %>
  real_ip_recursive <%= @real_ip_recursive %>;
  <% end %>
  <% @real_ip_trusted_addresses.each do |trusted_address| %>
  set_real_ip_from <%= trusted_address %>;
  <% end %>

  ## HSTS Config
  ## https://www.nginx.com/blog/http-strict-transport-security-hsts-and-nginx/
  <% unless @hsts_max_age.nil? || @hsts_max_age <= 0 %>
  add_header Strict-Transport-Security "max-age=<%= @hsts_max_age -%>
<% if @hsts_include_subdomains %>; includeSubdomains<% end %>";
  <% end %>

  <% if @referrer_policy %>
  # Rails sets a default policy of strict-origin-when-cross-origin, so
  # hide that and just send the one we've configured for nginx
  proxy_hide_header Referrer-Policy;
  add_header Referrer-Policy <%= @referrer_policy %>;
  <% end %>

  ## Individual nginx logs for this GitLab vhost
  access_log  <%= @log_directory %>/gitlab_access.log gitlab_access;
  error_log   <%= @log_directory %>/gitlab_error.log;

  if ($http_host = "") {
    <% default_host = Nginx.generate_host_header(@fqdn, @port, @https) %>
    set $http_host_with_default "<%= default_host %>";
  }

  if ($http_host != "") {
    set $http_host_with_default $http_host;
  }

<% if @gzip_enabled %>
  gzip <%= @gzip %>;
  gzip_static on;
  gzip_comp_level <%= @gzip_comp_level %>;
  gzip_http_version <%= @gzip_http_version %>;
  gzip_vary on;
  gzip_disable "msie6";
  gzip_min_length 250;
  gzip_proxied <%= @gzip_proxied %>;
  gzip_types <%= @gzip_types.join(' ') %>;
<% end %>

  ## https://github.com/gitlabhq/gitlabhq/issues/694
  ## Some requests take more than 30 seconds.
  proxy_read_timeout      <%= @proxy_read_timeout %>;
  proxy_connect_timeout   <%= @proxy_connect_timeout %>;
  proxy_redirect          off;
  <% if @custom_error_pages %>
  proxy_intercept_errors on;
  <% end %>
  proxy_http_version 1.1;

  <% @proxy_set_headers.each do |header| %>
  <% next if header[1].nil? || header[1].empty? %>
  proxy_set_header <%= header[0] %> <%= header[1] %>;
  <% end %>

  <% if node['gitlab']['gitlab-rails']['omniauth_enabled'] %>
  <% node['gitlab']['gitlab-rails']['omniauth_providers'].each do|provider| %>
    <% if provider['name'] == 'shibboleth' %>

  location = /shibauthorizer {
    internal;
    include /opt/gitlab/embedded/conf/fastcgi_params;
    fastcgi_pass unix:<%= @shibboleth_authorizer_sock %>;
  }

  location /Shibboleth.sso {
    include /opt/gitlab/embedded/conf/fastcgi_params;
    fastcgi_pass unix:<%= @shibboleth_responder_sock %>;
  }

  location /shibboleth-sp {
    alias /usr/share/shibboleth/;
  }
  location /users/auth/shibboleth  {
    proxy_pass http://<%= node['gitlab']['unicorn']['listen'] %>:<%= node['gitlab']['unicorn']['port'] %>;
    location = /users/auth/shibboleth/callback {
      shib_request /shibauthorizer;
      shib_request_use_headers on;
      proxy_pass http://<%= node['gitlab']['unicorn']['listen'] %>:<%= node['gitlab']['unicorn']['port'] %>;
    }
  }
        <% break %>
      <% end %>
    <% end %>
  <% end %>

  location ~ (<%= @request_buffering_off_path_regex %>) {
    proxy_cache off;
    proxy_pass http://gitlab-workhorse;
    proxy_request_buffering off;
  }

  <% if node['monitoring']['grafana']['enable'] -%>
  location <%= File.join(@path, '-/grafana/') %> {
    proxy_pass http://<%= node['monitoring']['grafana']['http_addr'] %>:<%= node['monitoring']['grafana']['http_port'] %>/;
  }

  <% end -%>
  <% if node['gitlab-kas']['enable'] -%>
  location <%= File.join(@path, '-/kubernetes-agent/') %> {
    proxy_pass http://<%= node['gitlab-kas']['listen_address'] %>/;
  }

  <% end -%>

  # health checks configuration
  include <%= @gitlab_health_conf %>;

  location <%= @path %> {
    proxy_cache off;
    proxy_pass  http://gitlab-workhorse;
  }

  location <%= File.join(@path, 'assets') %> {
    proxy_cache <%= @proxy_cache %>;
    proxy_pass  http://gitlab-workhorse;
  }

  <% errors = Nginx.parse_error_pages %>
  <% errors.each do |err, location| %>
  error_page <%= err %> /<%= location %>;
  <% end %>
  location ~ ^/(<%= errors.keys.join('|') %>)(-custom)?\.html$ {
    root <%= GitlabRails.public_path %>;
    internal;
  }

  <%= @custom_gitlab_server_config %>
}

# This file is managed by gitlab-ctl. Manual changes will be
# erased! To change the contents below, edit /etc/gitlab/gitlab.rb
# and run `sudo gitlab-ctl reconfigure`.

user <%= node['gitlab']['web-server']['username'] %> <%= node['gitlab']['web-server']['group']%>;
worker_processes <%= @worker_processes %>;
error_log stderr;
pid nginx.pid;

daemon off;

<% if node['gitlab']['gitlab-rails']['omniauth_enabled'] %>
  <% node['gitlab']['gitlab-rails']['omniauth_providers'].each do|provider| %>
    <% if provider['name'] == 'shibboleth' %>
load_module <%= @shibboleth_module %>;
      <% break %>
    <% end %>
  <% end %>
<% end %>

events {
  worker_connections <%= @worker_connections %>;
}

http {
  log_format gitlab_access '<%= @gitlab_access_log_format %>';
  log_format gitlab_mattermost_access '<%= @gitlab_mattermost_access_log_format %>';

  server_names_hash_bucket_size <%= @server_names_hash_bucket_size %>;

  sendfile <%= @sendfile %>;
  tcp_nopush <%= @tcp_nopush %>;
  tcp_nodelay <%= @tcp_nodelay %>;

  keepalive_timeout <%= @keepalive_timeout %>;

  gzip <%= @gzip %>;
  gzip_http_version <%= @gzip_http_version %>;
  gzip_comp_level <%= @gzip_comp_level %>;
  gzip_proxied <%= @gzip_proxied %>;
  gzip_types <%= @gzip_types.join(' ') %>;

  include /opt/gitlab/embedded/conf/mime.types;

  proxy_cache_path <%= @proxy_cache_path %>;
  proxy_cache <%= @proxy_cache %>;

  map $http_upgrade $connection_upgrade {
      default upgrade;
      ''      close;
  }

  # Remove private_token from the request URI
  # In:  /foo?private_token=unfiltered&authenticity_token=unfiltered&rss_token=unfiltered&...
  # Out: /foo?private_token=[FILTERED]&authenticity_token=unfiltered&rss_token=unfiltered&...
  map $request_uri $temp_request_uri_1 {
    default $request_uri;
    ~(?i)^(?<start>.*)(?<temp>[\?&]private[\-_]token)=[^&]*(?<rest>.*)$ "$start$temp=[FILTERED]$rest";
  }

  # Remove authenticity_token from the request URI
  # In:  /foo?private_token=[FILTERED]&authenticity_token=unfiltered&rss_token=unfiltered&...
  # Out: /foo?private_token=[FILTERED]&authenticity_token=[FILTERED]&rss_token=unfiltered&...
  map $temp_request_uri_1 $temp_request_uri_2 {
    default $temp_request_uri_1;
    ~(?i)^(?<start>.*)(?<temp>[\?&]authenticity[\-_]token)=[^&]*(?<rest>.*)$ "$start$temp=[FILTERED]$rest";
  }

  # Remove rss_token from the request URI
  # In:  /foo?private_token=[FILTERED]&authenticity_token=[FILTERED]&rss_token=unfiltered&...
  # Out: /foo?private_token=[FILTERED]&authenticity_token=[FILTERED]&rss_token=[FILTERED]&...
  map $temp_request_uri_2 $filtered_request_uri {
    default $temp_request_uri_2;
    ~(?i)^(?<start>.*)(?<temp>[\?&]rss[\-_]token)=[^&]*(?<rest>.*)$ "$start$temp=[FILTERED]$rest";
  }

  # A version of the referer without the query string
  map $http_referer $filtered_http_referer {
    default $http_referer;
    ~^(?<temp>.*)\? $temp;
  }

  <% if @status['vts_enable'] -%>
  # Enable vts status module.
  vhost_traffic_status_zone;
  <% end -%>

#  upstream gitlab-workhorse {
#    server <%= "unix:" if node['gitlab']['gitlab-workhorse']['listen_network'] == "unix" %><%= node['gitlab']['gitlab-workhorse']['listen_addr'] %>;
#  }

  <% if @gitlab_http_config %>
  include <%= @gitlab_http_config %>;
  <% end %>

  <% if @gitlab_smartcard_http_config %>
  include <%= @gitlab_smartcard_http_config %>;
  <% end %>

  <% if @gitlab_pages_http_config %>
  include <%= @gitlab_pages_http_config %>;
  <% end %>

  <% if @gitlab_mattermost_http_config %>
  include <%= @gitlab_mattermost_http_config %>;
  <% end %>

  <% if @gitlab_registry_http_config %>
  include <%= @gitlab_registry_http_config %>;
  <% end %>

  <% if @nginx_status_config %>
  include <%= @nginx_status_config %>;
  <% end %>

  <%= @custom_nginx_config %>
}