730 lines
26 KiB
Ruby
730 lines
26 KiB
Ruby
require 'etc'
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require 'logger'
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require 'pathname'
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require 'stringio'
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require 'thread'
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require 'timeout'
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require 'log4r'
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require 'net/ssh'
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require 'net/ssh/proxy/command'
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require 'net/scp'
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require 'vagrant/util/ansi_escape_code_remover'
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require 'vagrant/util/file_mode'
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require 'vagrant/util/keypair'
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require 'vagrant/util/platform'
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require 'vagrant/util/retryable'
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module VagrantPlugins
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module CommunicatorSSH
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# This class provides communication with the VM via SSH.
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class Communicator < Vagrant.plugin("2", :communicator)
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# Marker for start of PTY enabled command output
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PTY_DELIM_START = "bccbb768c119429488cfd109aacea6b5-pty"
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# Marker for end of PTY enabled command output
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PTY_DELIM_END = "bccbb768c119429488cfd109aacea6b5-pty"
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# Marker for start of regular command output
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CMD_GARBAGE_MARKER = "41e57d38-b4f7-4e46-9c38-13873d338b86-vagrant-ssh"
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# These are the exceptions that we retry because they represent
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# errors that are generally fixed from a retry and don't
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# necessarily represent immediate failure cases.
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SSH_RETRY_EXCEPTIONS = [
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Errno::EACCES,
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Errno::EADDRINUSE,
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Errno::ECONNABORTED,
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Errno::ECONNREFUSED,
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Errno::ECONNRESET,
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Errno::ENETUNREACH,
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Errno::EHOSTUNREACH,
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Errno::EPIPE,
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Net::SSH::Disconnect,
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Timeout::Error
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]
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include Vagrant::Util::ANSIEscapeCodeRemover
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include Vagrant::Util::Retryable
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def self.match?(machine)
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# All machines are currently expected to have SSH.
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true
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end
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def initialize(machine)
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@lock = Mutex.new
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@machine = machine
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@logger = Log4r::Logger.new("vagrant::communication::ssh")
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@connection = nil
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@inserted_key = false
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end
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def wait_for_ready(timeout)
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Timeout.timeout(timeout) do
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# Wait for ssh_info to be ready
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ssh_info = nil
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while true
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ssh_info = @machine.ssh_info
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break if ssh_info
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sleep 0.5
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end
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# Got it! Let the user know what we're connecting to.
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@machine.ui.detail("SSH address: #{ssh_info[:host]}:#{ssh_info[:port]}")
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@machine.ui.detail("SSH username: #{ssh_info[:username]}")
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ssh_auth_type = "private key"
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ssh_auth_type = "password" if ssh_info[:password]
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@machine.ui.detail("SSH auth method: #{ssh_auth_type}")
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last_message = nil
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last_message_repeat_at = 0
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while true
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message = nil
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begin
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begin
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connect(retries: 1)
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return true if ready?
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rescue Vagrant::Errors::VagrantError => e
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@logger.info("SSH not ready: #{e.inspect}")
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raise
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end
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rescue Vagrant::Errors::SSHConnectionTimeout
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message = "Connection timeout."
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rescue Vagrant::Errors::SSHAuthenticationFailed
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message = "Authentication failure."
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rescue Vagrant::Errors::SSHDisconnected
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message = "Remote connection disconnect."
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rescue Vagrant::Errors::SSHConnectionRefused
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message = "Connection refused."
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rescue Vagrant::Errors::SSHConnectionReset
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message = "Connection reset."
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rescue Vagrant::Errors::SSHConnectionAborted
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message = "Connection aborted."
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rescue Vagrant::Errors::SSHHostDown
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message = "Host appears down."
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rescue Vagrant::Errors::SSHNoRoute
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message = "Host unreachable."
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rescue Vagrant::Errors::SSHInvalidShell
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raise
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rescue Vagrant::Errors::SSHKeyTypeNotSupported
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raise
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rescue Vagrant::Errors::SSHKeyBadOwner
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raise
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rescue Vagrant::Errors::SSHKeyBadPermissions
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raise
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rescue Vagrant::Errors::SSHInsertKeyUnsupported
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raise
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rescue Vagrant::Errors::VagrantError => e
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# Ignore it, SSH is not ready, some other error.
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end
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# If we have a message to show, then show it. We don't show
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# repeated messages unless they've been repeating longer than
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# 10 seconds.
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if message
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message_at = Time.now.to_f
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show_message = true
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if last_message == message
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show_message = (message_at - last_message_repeat_at) > 10.0
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end
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if show_message
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@machine.ui.detail("Warning: #{message} Retrying...")
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last_message = message
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last_message_repeat_at = message_at
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end
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end
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end
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end
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rescue Timeout::Error
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return false
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end
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def ready?
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@logger.debug("Checking whether SSH is ready...")
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# Attempt to connect. This will raise an exception if it fails.
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begin
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connect
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@logger.info("SSH is ready!")
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rescue Vagrant::Errors::VagrantError => e
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# We catch a `VagrantError` which would signal that something went
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# wrong expectedly in the `connect`, which means we didn't connect.
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@logger.info("SSH not up: #{e.inspect}")
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return false
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end
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# Verify the shell is valid
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if execute("", error_check: false) != 0
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raise Vagrant::Errors::SSHInvalidShell
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end
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# If we're already attempting to switch out the SSH key, then
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# just return that we're ready (for Machine#guest).
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@lock.synchronize do
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return true if @inserted_key || !machine_config_ssh.insert_key
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@inserted_key = true
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end
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# If we used a password, then insert the insecure key
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ssh_info = @machine.ssh_info
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insert = ssh_info[:password] && ssh_info[:private_key_path].empty?
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ssh_info[:private_key_path].each do |pk|
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if insecure_key?(pk)
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insert = true
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@machine.ui.detail("\n"+I18n.t("vagrant.inserting_insecure_detected"))
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break
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end
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end
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if insert
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# If we don't have the power to insert/remove keys, then its an error
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cap = @machine.guest.capability?(:insert_public_key) &&
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@machine.guest.capability?(:remove_public_key)
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raise Vagrant::Errors::SSHInsertKeyUnsupported if !cap
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_pub, priv, openssh = Vagrant::Util::Keypair.create
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@logger.info("Inserting key to avoid password: #{openssh}")
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@machine.ui.detail("\n"+I18n.t("vagrant.inserting_random_key"))
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@machine.guest.capability(:insert_public_key, openssh)
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# Write out the private key in the data dir so that the
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# machine automatically picks it up.
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@machine.data_dir.join("private_key").open("w+") do |f|
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f.write(priv)
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end
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# Adjust private key file permissions
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if Vagrant::Util::Platform.windows?
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begin
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priv_path = @machine.data_dir.join("private_key").to_s
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File.set_permissions(priv_path, Etc.getlogin => File::FULL)
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rescue => e
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@logger.warn("Error encountered during private key permissions set - " \
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"#{e.class}: #{e.message}")
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end
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else
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@machine.data_dir.join("private_key").chmod(0600)
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end
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# Remove the old key if it exists
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@machine.ui.detail(I18n.t("vagrant.inserting_remove_key"))
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@machine.guest.capability(
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:remove_public_key,
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Vagrant.source_root.join("keys", "vagrant.pub").read.chomp)
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# Done, restart.
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@machine.ui.detail(I18n.t("vagrant.inserted_key"))
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@connection.close
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@connection = nil
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return ready?
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end
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# If we reached this point then we successfully connected
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true
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end
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def execute(command, opts=nil, &block)
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opts = {
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error_check: true,
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error_class: Vagrant::Errors::VagrantError,
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error_key: :ssh_bad_exit_status,
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good_exit: 0,
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command: command,
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shell: nil,
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sudo: false,
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}.merge(opts || {})
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opts[:good_exit] = Array(opts[:good_exit])
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# Connect via SSH and execute the command in the shell.
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stdout = ""
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stderr = ""
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exit_status = connect do |connection|
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shell_opts = {
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sudo: opts[:sudo],
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shell: opts[:shell],
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}
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shell_execute(connection, command, **shell_opts) do |type, data|
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if type == :stdout
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stdout += data
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elsif type == :stderr
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stderr += data
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end
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block.call(type, data) if block
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end
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end
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# Check for any errors
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if opts[:error_check] && !opts[:good_exit].include?(exit_status)
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# The error classes expect the translation key to be _key,
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# but that makes for an ugly configuration parameter, so we
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# set it here from `error_key`
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error_opts = opts.merge(
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_key: opts[:error_key],
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stdout: stdout,
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stderr: stderr
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)
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raise opts[:error_class], error_opts
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end
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# Return the exit status
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exit_status
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end
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def sudo(command, opts=nil, &block)
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# Run `execute` but with the `sudo` option.
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opts = { sudo: true }.merge(opts || {})
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execute(command, opts, &block)
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end
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def download(from, to=nil)
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@logger.debug("Downloading: #{from} to #{to}")
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scp_connect do |scp|
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scp.download!(from, to)
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end
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end
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def test(command, opts=nil)
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opts = { error_check: false }.merge(opts || {})
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execute(command, opts) == 0
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end
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def upload(from, to)
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@logger.debug("Uploading: #{from} to #{to}")
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scp_connect do |scp|
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if File.directory?(from)
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# Recursively upload directories
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scp.upload!(from, to, recursive: true)
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else
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# Open file read only to fix issue [GH-1036]
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scp.upload!(File.open(from, "r"), to)
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end
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end
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rescue RuntimeError => e
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# Net::SCP raises a runtime error for this so the only way we have
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# to really catch this exception is to check the message to see if
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# it is something we care about. If it isn't, we re-raise.
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raise if e.message !~ /Permission denied/
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# Otherwise, it is a permission denied, so let's raise a proper
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# exception
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raise Vagrant::Errors::SCPPermissionDenied,
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from: from.to_s,
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to: to.to_s
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end
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protected
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# Opens an SSH connection and yields it to a block.
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def connect(**opts)
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if @connection && !@connection.closed?
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# There is a chance that the socket is closed despite us checking
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# 'closed?' above. To test this we need to send data through the
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# socket.
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#
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# We wrap the check itself in a 5 second timeout because there
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# are some cases where this will just hang.
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begin
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Timeout.timeout(5) do
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@connection.exec!("")
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end
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rescue Exception => e
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@logger.info("Connection errored, not re-using. Will reconnect.")
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@logger.debug(e.inspect)
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@connection = nil
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end
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# If the @connection is still around, then it is valid,
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# and we use it.
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if @connection
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@logger.debug("Re-using SSH connection.")
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return yield @connection if block_given?
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return
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end
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end
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# Get the SSH info for the machine, raise an exception if the
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# provider is saying that SSH is not ready.
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ssh_info = @machine.ssh_info
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raise Vagrant::Errors::SSHNotReady if ssh_info.nil?
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# Default some options
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opts[:retries] = 5 if !opts.key?(:retries)
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# Set some valid auth methods. We disable the auth methods that
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# we're not using if we don't have the right auth info.
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auth_methods = ["none", "hostbased"]
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auth_methods << "publickey" if ssh_info[:private_key_path]
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auth_methods << "password" if ssh_info[:password]
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# yanked directly from ruby's Net::SSH, but with `none` last
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# TODO: Remove this once Vagrant has updated its dependency on Net:SSH
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# to be > 4.1.0, which should include this fix.
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cipher_array = Net::SSH::Transport::Algorithms::ALGORITHMS[:encryption].dup
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if cipher_array.delete("none")
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cipher_array.push("none")
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end
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# Build the options we'll use to initiate the connection via Net::SSH
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common_connect_opts = {
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auth_methods: auth_methods,
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config: false,
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forward_agent: ssh_info[:forward_agent],
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send_env: ssh_info[:forward_env],
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keys_only: ssh_info[:keys_only],
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verify_host_key: ssh_info[:verify_host_key],
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password: ssh_info[:password],
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port: ssh_info[:port],
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timeout: 15,
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user_known_hosts_file: [],
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verbose: :debug,
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encryption: cipher_array,
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}
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# Connect to SSH, giving it a few tries
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connection = nil
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begin
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timeout = 60
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@logger.info("Attempting SSH connection...")
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connection = retryable(tries: opts[:retries], on: SSH_RETRY_EXCEPTIONS) do
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Timeout.timeout(timeout) do
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begin
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# This logger will get the Net-SSH log data for us.
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ssh_logger_io = StringIO.new
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ssh_logger = Logger.new(ssh_logger_io)
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# Setup logging for connections
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connect_opts = common_connect_opts.dup
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connect_opts[:logger] = ssh_logger
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if ssh_info[:private_key_path]
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connect_opts[:keys] = ssh_info[:private_key_path]
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end
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if ssh_info[:proxy_command]
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connect_opts[:proxy] = Net::SSH::Proxy::Command.new(ssh_info[:proxy_command])
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end
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@logger.info("Attempting to connect to SSH...")
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@logger.info(" - Host: #{ssh_info[:host]}")
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@logger.info(" - Port: #{ssh_info[:port]}")
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@logger.info(" - Username: #{ssh_info[:username]}")
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@logger.info(" - Password? #{!!ssh_info[:password]}")
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@logger.info(" - Key Path: #{ssh_info[:private_key_path]}")
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@logger.debug(" - connect_opts: #{connect_opts}")
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Net::SSH.start(ssh_info[:host], ssh_info[:username], connect_opts)
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ensure
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# Make sure we output the connection log
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@logger.debug("== Net-SSH connection debug-level log START ==")
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@logger.debug(ssh_logger_io.string)
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@logger.debug("== Net-SSH connection debug-level log END ==")
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end
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end
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end
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rescue Errno::EACCES
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# This happens on connect() for unknown reasons yet...
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raise Vagrant::Errors::SSHConnectEACCES
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rescue Errno::ETIMEDOUT, Timeout::Error
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# This happens if we continued to timeout when attempting to connect.
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raise Vagrant::Errors::SSHConnectionTimeout
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rescue Net::SSH::AuthenticationFailed
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# This happens if authentication failed. We wrap the error in our
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# own exception.
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raise Vagrant::Errors::SSHAuthenticationFailed
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rescue Net::SSH::Disconnect
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# This happens if the remote server unexpectedly closes the
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# connection. This is usually raised when SSH is running on the
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# other side but can't properly setup a connection. This is
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# usually a server-side issue.
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raise Vagrant::Errors::SSHDisconnected
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rescue Errno::ECONNREFUSED
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# This is raised if we failed to connect the max amount of times
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raise Vagrant::Errors::SSHConnectionRefused
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rescue Errno::ECONNRESET
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# This is raised if we failed to connect the max number of times
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# due to an ECONNRESET.
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raise Vagrant::Errors::SSHConnectionReset
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rescue Errno::ECONNABORTED
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# This is raised if we failed to connect the max number of times
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# due to an ECONNABORTED
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raise Vagrant::Errors::SSHConnectionAborted
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rescue Errno::EHOSTDOWN
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# This is raised if we get an ICMP DestinationUnknown error.
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raise Vagrant::Errors::SSHHostDown
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rescue Errno::EHOSTUNREACH, Errno::ENETUNREACH
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# This is raised if we can't work out how to route traffic.
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raise Vagrant::Errors::SSHNoRoute
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rescue Net::SSH::Exception => e
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# This is an internal error in Net::SSH
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raise Vagrant::Errors::NetSSHException, message: e.message
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rescue NotImplementedError
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# This is raised if a private key type that Net-SSH doesn't support
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# is used. Show a nicer error.
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raise Vagrant::Errors::SSHKeyTypeNotSupported
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end
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@connection = connection
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@connection_ssh_info = ssh_info
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# Yield the connection that is ready to be used and
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# return the value of the block
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return yield connection if block_given?
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end
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# The shell wrapper command used in shell_execute defined by
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# the sudo and shell options.
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def shell_cmd(opts)
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sudo = opts[:sudo]
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shell = opts[:shell]
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# Determine the shell to execute. Prefer the explicitly passed in shell
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# over the default configured shell. If we are using `sudo` then we
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# need to wrap the shell in a `sudo` call.
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cmd = machine_config_ssh.shell
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cmd = shell if shell
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cmd = machine_config_ssh.sudo_command.gsub("%c", cmd) if sudo
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cmd
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end
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# Executes the command on an SSH connection within a login shell.
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def shell_execute(connection, command, **opts)
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opts = {
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sudo: false,
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shell: nil
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}.merge(opts)
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sudo = opts[:sudo]
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@logger.info("Execute: #{command} (sudo=#{sudo.inspect})")
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exit_status = nil
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# These variables are used to scrub PTY output if we're in a PTY
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pty = false
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pty_stdout = ""
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# Open the channel so we can execute or command
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channel = connection.open_channel do |ch|
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if machine_config_ssh.pty
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ch.request_pty do |ch2, success|
|
|
pty = success && command != ""
|
|
|
|
if success
|
|
@logger.debug("pty obtained for connection")
|
|
else
|
|
@logger.warn("failed to obtain pty, will try to continue anyways")
|
|
end
|
|
end
|
|
end
|
|
|
|
marker_found = false
|
|
data_buffer = ''
|
|
stderr_marker_found = false
|
|
stderr_data_buffer = ''
|
|
|
|
ch.exec(shell_cmd(opts)) do |ch2, _|
|
|
# Setup the channel callbacks so we can get data and exit status
|
|
ch2.on_data do |ch3, data|
|
|
# Filter out the clear screen command
|
|
data = remove_ansi_escape_codes(data)
|
|
|
|
if pty
|
|
pty_stdout << data
|
|
else
|
|
if !marker_found
|
|
data_buffer << data
|
|
marker_index = data_buffer.index(CMD_GARBAGE_MARKER)
|
|
if marker_index
|
|
marker_found = true
|
|
data_buffer.slice!(0, marker_index + CMD_GARBAGE_MARKER.size)
|
|
data.replace(data_buffer)
|
|
data_buffer = nil
|
|
end
|
|
end
|
|
|
|
if block_given? && marker_found && !data.empty?
|
|
yield :stdout, data
|
|
end
|
|
end
|
|
end
|
|
|
|
ch2.on_extended_data do |ch3, type, data|
|
|
# Filter out the clear screen command
|
|
data = remove_ansi_escape_codes(data)
|
|
@logger.debug("stderr: #{data}")
|
|
if !stderr_marker_found
|
|
stderr_data_buffer << data
|
|
marker_index = stderr_data_buffer.index(CMD_GARBAGE_MARKER)
|
|
if marker_index
|
|
marker_found = true
|
|
stderr_data_buffer.slice!(0, marker_index + CMD_GARBAGE_MARKER.size)
|
|
data.replace(stderr_data_buffer)
|
|
data_buffer = nil
|
|
end
|
|
end
|
|
|
|
if block_given? && marker_found && !data.empty?
|
|
yield :stderr, data
|
|
end
|
|
end
|
|
|
|
ch2.on_request("exit-status") do |ch3, data|
|
|
exit_status = data.read_long
|
|
@logger.debug("Exit status: #{exit_status}")
|
|
|
|
# Close the channel, since after the exit status we're
|
|
# probably done. This fixes up issues with hanging.
|
|
ch.close
|
|
end
|
|
|
|
# Set the terminal
|
|
ch2.send_data generate_environment_export("TERM", "vt100")
|
|
|
|
# Set SSH_AUTH_SOCK if we are in sudo and forwarding agent.
|
|
# This is to work around often misconfigured boxes where
|
|
# the SSH_AUTH_SOCK env var is not preserved.
|
|
if @connection_ssh_info[:forward_agent] && sudo
|
|
auth_socket = ""
|
|
execute("echo; printf $SSH_AUTH_SOCK") do |type, data|
|
|
if type == :stdout
|
|
auth_socket += data
|
|
end
|
|
end
|
|
|
|
if auth_socket != ""
|
|
# Make sure we only read the last line which should be
|
|
# the $SSH_AUTH_SOCK env var we printed.
|
|
auth_socket = auth_socket.split("\n").last.chomp
|
|
end
|
|
|
|
if auth_socket == ""
|
|
@logger.warn("No SSH_AUTH_SOCK found despite forward_agent being set.")
|
|
else
|
|
@logger.info("Setting SSH_AUTH_SOCK remotely: #{auth_socket}")
|
|
ch2.send_data generate_environment_export("SSH_AUTH_SOCK", auth_socket)
|
|
end
|
|
end
|
|
|
|
# Output the command. If we're using a pty we have to do
|
|
# a little dance to make sure we get all the output properly
|
|
# without the cruft added from pty mode.
|
|
if pty
|
|
data = "stty raw -echo\n"
|
|
data += generate_environment_export("PS1", "")
|
|
data += generate_environment_export("PS2", "")
|
|
data += generate_environment_export("PROMPT_COMMAND", "")
|
|
data += "printf #{PTY_DELIM_START}\n"
|
|
data += "#{command}\n"
|
|
data += "exitcode=$?\n"
|
|
data += "printf #{PTY_DELIM_END}\n"
|
|
data += "exit $exitcode\n"
|
|
data = data.force_encoding('ASCII-8BIT')
|
|
ch2.send_data data
|
|
else
|
|
ch2.send_data "printf '#{CMD_GARBAGE_MARKER}'\n(>&2 printf '#{CMD_GARBAGE_MARKER}')\n#{command}\n".force_encoding('ASCII-8BIT')
|
|
# Remember to exit or this channel will hang open
|
|
ch2.send_data "exit\n"
|
|
end
|
|
|
|
# Send eof to let server know we're done
|
|
ch2.eof!
|
|
end
|
|
end
|
|
|
|
begin
|
|
keep_alive = nil
|
|
|
|
if machine_config_ssh.keep_alive
|
|
# Begin sending keep-alive packets while we wait for the script
|
|
# to complete. This avoids connections closing on long-running
|
|
# scripts.
|
|
keep_alive = Thread.new do
|
|
loop do
|
|
sleep 5
|
|
@logger.debug("Sending SSH keep-alive...")
|
|
connection.send_global_request("keep-alive@openssh.com")
|
|
end
|
|
end
|
|
end
|
|
|
|
# Wait for the channel to complete
|
|
begin
|
|
channel.wait
|
|
rescue Errno::ECONNRESET, IOError
|
|
@logger.info(
|
|
"SSH connection unexpected closed. Assuming reboot or something.")
|
|
exit_status = 0
|
|
pty = false
|
|
rescue Net::SSH::ChannelOpenFailed
|
|
raise Vagrant::Errors::SSHChannelOpenFail
|
|
rescue Net::SSH::Disconnect
|
|
raise Vagrant::Errors::SSHDisconnected
|
|
end
|
|
ensure
|
|
# Kill the keep-alive thread
|
|
keep_alive.kill if keep_alive
|
|
end
|
|
|
|
# If we're in a PTY, we now finally parse the output
|
|
if pty
|
|
@logger.debug("PTY stdout: #{pty_stdout}")
|
|
if !pty_stdout.include?(PTY_DELIM_START) || !pty_stdout.include?(PTY_DELIM_END)
|
|
@logger.error("PTY stdout doesn't include delims")
|
|
raise Vagrant::Errors::SSHInvalidShell.new
|
|
end
|
|
|
|
data = pty_stdout[/.*#{PTY_DELIM_START}(.*?)#{PTY_DELIM_END}/m, 1]
|
|
data ||= ""
|
|
@logger.debug("PTY stdout parsed: #{data}")
|
|
yield :stdout, data if block_given?
|
|
end
|
|
|
|
# Return the final exit status
|
|
return exit_status
|
|
end
|
|
|
|
# Opens an SCP connection and yields it so that you can download
|
|
# and upload files.
|
|
def scp_connect
|
|
# Connect to SCP and yield the SCP object
|
|
connect do |connection|
|
|
scp = Net::SCP.new(connection)
|
|
return yield scp
|
|
end
|
|
rescue Net::SCP::Error => e
|
|
# If we get the exit code of 127, then this means SCP is unavailable.
|
|
raise Vagrant::Errors::SCPUnavailable if e.message =~ /\(127\)/
|
|
|
|
# Otherwise, just raise the error up
|
|
raise
|
|
end
|
|
|
|
# This will test whether path is the Vagrant insecure private key.
|
|
#
|
|
# @param [String] path
|
|
def insecure_key?(path)
|
|
return false if !path
|
|
return false if !File.file?(path)
|
|
source_path = Vagrant.source_root.join("keys", "vagrant")
|
|
return File.read(path).chomp == source_path.read.chomp
|
|
end
|
|
|
|
def generate_environment_export(env_key, env_value)
|
|
template = machine_config_ssh.export_command_template
|
|
template.sub("%ENV_KEY%", env_key).sub("%ENV_VALUE%", env_value) + "\n"
|
|
end
|
|
|
|
def machine_config_ssh
|
|
@machine.config.ssh
|
|
end
|
|
end
|
|
end
|
|
end
|