1 files changed, 60 insertions, 0 deletions
diff --git a/lib/system_check/ldap_check.rb b/lib/system_check/ldap_check.rb
new file mode 100644
index 00000000000..619fb3cccb8
--- /dev/null
+++ b/lib/system_check/ldap_check.rb
@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+module SystemCheck
+  # Used by gitlab:ldap:check rake task
+  class LdapCheck < BaseCheck
+    set_name 'LDAP:'
+
+    def multi_check
+      if Gitlab::Auth::LDAP::Config.enabled?
+        # Only show up to 100 results because LDAP directories can be very big.
+        # This setting only affects the `rake gitlab:check` script.
+        limit = ENV['LDAP_CHECK_LIMIT']
+        limit = 100 if limit.blank?
+
+        check_ldap(limit)
+      else
+        $stdout.puts 'LDAP is disabled in config/gitlab.yml'
+      end
+    end
+
+    private
+
+    def check_ldap(limit)
+      servers = Gitlab::Auth::LDAP::Config.providers
+
+      servers.each do |server|
+        $stdout.puts "Server: #{server}"
+
+        begin
+          Gitlab::Auth::LDAP::Adapter.open(server) do |adapter|
+            check_ldap_auth(adapter)
+
+            $stdout.puts "LDAP users with access to your GitLab server (only showing the first #{limit} results)"
+
+            users = adapter.users(adapter.config.uid, '*', limit)
+            users.each do |user|
+              $stdout.puts "\tDN: #{user.dn}\t #{adapter.config.uid}: #{user.uid}"
+            end
+          end
+        rescue Net::LDAP::ConnectionRefusedError, Errno::ECONNREFUSED => e
+          $stdout.puts "Could not connect to the LDAP server: #{e.message}".color(:red)
+        end
+      end
+    end
+
+    def check_ldap_auth(adapter)
+      auth = adapter.config.has_auth?
+
+      message = if auth && adapter.ldap.bind
+                  'Success'.color(:green)
+                elsif auth
+                  'Failed. Check `bind_dn` and `password` configuration values'.color(:red)
+                else
+                  'Anonymous. No `bind_dn` or `password` configured'.color(:yellow)
+                end
+
+      $stdout.puts "LDAP authentication... #{message}"
+    end
+  end
+end