handles su - USER sesssion to perform bootstrap

Signed-off-by: Vivek Singh <vivek.singh@msystechnologies.com>

1 files changed, 63 insertions, 4 deletions

diff --git a/lib/chef/knife/bootstrap.rb b/lib/chef/knife/bootstrap.rb
index 1550c62dc1..d7eb9490e7 100644
--- a/lib/chef/knife/bootstrap.rb
+++ b/lib/chef/knife/bootstrap.rb
@@ -217,6 +217,16 @@ class Chef
         description: "Execute the bootstrap via sudo with password.",
         boolean: false
 
+      # runtime - su user
+      option :su_user,
+        long: "--su-user NAME",
+        description: "The su - USER name to perform bootstrap command using a non-root user."
+
+      # runtime - su user password
+      option :su_password,
+        long: "--su-password PASSWORD",
+        description: "The su USER password for authentication."
+
       # runtime - client_builder
       option :chef_node_name,
         short: "-N NAME",
@@ -591,13 +601,30 @@ class Chef
       def perform_bootstrap(remote_bootstrap_script_path)
         ui.info("Bootstrapping #{ui.color(server_name, :bold)}")
         cmd = bootstrap_command(remote_bootstrap_script_path)
+        bootstrap_run_command(cmd)
+      end
+
+      # Actual bootstrap command to perform on the node.
+      # Handles recursive calls if su USER failed to authenticate.
+      def bootstrap_run_command(cmd)
         r = connection.run_command(cmd) do |data|
           ui.msg("#{ui.color(" [#{connection.hostname}]", :cyan)} #{data}")
         end
         if r.exit_status != 0
-          ui.error("The following error occurred on #{server_name}:")
-          ui.error(r.stderr)
-          exit 1
+          stderr = (r.stderr + r.stdout).strip
+
+          if stderr.match?("su: Authentication failure")
+            ui.warn("Failed to authenticate su - #{config[:su_user]} to #{server_name}")
+            password = ui.ask("Enter password for su - #{config[:su_user]}@#{server_name}:", echo: false)
+
+            set_transport_options(su_password: password)
+
+            bootstrap_run_command(cmd)
+          else
+            ui.error("The following error occurred on #{server_name}:")
+            ui.error(stderr)
+            exit(r.exit_status)
+          end
         end
       end
 
@@ -881,6 +908,7 @@ class Chef
         @connection_opts.merge! winrm_opts
         @connection_opts.merge! ssh_opts
         @connection_opts.merge! ssh_identity_opts
+        @connection_opts.merge! su_user_opts
         @connection_opts
       end
 
@@ -1046,6 +1074,15 @@ class Chef
         }
       end
 
+      def su_user_opts
+        opts = {}
+        return opts if winrm? || !config.key?(:su_user)
+
+        opts[:su_user] = config[:su_user]
+        opts[:su_password] = config[:su_password] || config[:connection_password]
+        opts
+      end
+
       # This is for deprecating config options. The fallback_key can be used
       # to pull an old knife config option out of the config file when the
       # cli value has been renamed.  This is different from the deprecated
@@ -1082,7 +1119,17 @@ class Chef
         if connection.windows?
           "cmd.exe /C #{remote_path}"
         else
-          "sh #{remote_path}"
+          cmd = "sh #{remote_path}"
+
+          if config[:su_user]
+            # su - USER is subject to required an interactive console
+            # Otherwise, it will raise: su: must be run from a terminal
+            set_transport_options(pty: true)
+            cmd = "su - #{config[:su_user]} -c '#{cmd}'"
+            cmd = "sudo " << cmd if config[:use_sudo]
+          end
+
+          cmd
         end
       end
 
@@ -1137,6 +1184,18 @@ class Chef
 
         timeout.to_i
       end
+
+      # Train::Transports::SSH::Connection#transport_options
+      # Append the options to connection transport_options
+      #
+      # @param opts [Hash] the opts to be added to connection transport_options.
+      # @return [Hash] transport_options if the opts contains any option to be set.
+      #
+      def set_transport_options(opts)
+        return unless opts.is_a?(Hash) || !opts.empty?
+
+        connection&.connection&.transport_options&.merge! opts
+      end
     end
   end
 end