Class: Vagrant::Util::Keypair::Rsa

Inherits:
Object
  • Object
show all
Extended by:
Retryable
Defined in:
lib/vagrant/util/keypair.rb

Class Method Summary collapse

Methods included from Retryable

retryable

Class Method Details

.create(password = nil) ⇒ Array<String, String, String>

Creates an SSH keypair and returns it.

Parameters:

  • password (String) (defaults to: nil) —

    Password for the key, or nil for no password.

Returns:

  • (Array<String, String, String>) —

    PEM-encoded public and private key, respectively. The final element is the OpenSSH encoded public key.



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# File 'lib/vagrant/util/keypair.rb', line 104

def self.create(password=nil)
  # This sometimes fails with RSAError. It is inconsistent and strangely
  # sleeps seem to fix it. We just retry this a few times. See GH-5056
  rsa_key = nil
  retryable(on: OpenSSL::PKey::RSAError, sleep: 2, tries: 5) do
    rsa_key = OpenSSL::PKey::RSA.new(2048)
  end

  public_key  = rsa_key.public_key
  private_key = rsa_key.to_pem

  if password
    cipher      = OpenSSL::Cipher.new('des3')
    private_key = rsa_key.to_pem(cipher, password)
  end

  # Generate the binary necessary for the OpenSSH public key.
  binary = [7].pack("N")
  binary += "ssh-rsa"
  ["e", "n"].each do |m|
    val  = public_key.send(m)
    data = val.to_s(2)

    first_byte = data[0,1].unpack("c").first
    if val < 0
      data[0] = [0x80 & first_byte].pack("c")
    elsif first_byte < 0
      data = 0.chr + data
    end

    binary += [data.length].pack("N") + data
  end

  openssh_key = "ssh-rsa #{Base64.encode64(binary).gsub("\n", "")} vagrant"
  public_key  = public_key.to_pem
  return [public_key, private_key, openssh_key]
end