Module: EchSpec::TLS13Client

Defined in:
lib/echspec/tls13_client.rb

Overview

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Defined Under Namespace

Classes: Connection

Class Method Summary collapse

Class Method Details

.gen_ch_extensions(hostname) ⇒ TTTLS13::Message::Extensions, Hash of NamedGroup => OpenSSL::PKey::EC.$Object

Parameters:

  • hostname (String)

Returns:

  • (TTTLS13::Message::Extensions)
  • (Hash of NamedGroup => OpenSSL::PKey::EC.$Object) 


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# File 'lib/echspec/tls13_client.rb', line 36

def gen_ch_extensions(hostname)
  exs = TTTLS13::Message::Extensions.new
  # server_name
  exs << TTTLS13::Message::Extension::ServerName.new(hostname)

  # supported_versions: only TLS 1.3
  exs << TTTLS13::Message::Extension::SupportedVersions.new(
    msg_type: TTTLS13::Message::HandshakeType::CLIENT_HELLO
  )

  # signature_algorithms
  exs << TTTLS13::Message::Extension::SignatureAlgorithms.new(
    [
      TTTLS13::SignatureScheme::ECDSA_SECP256R1_SHA256,
      TTTLS13::SignatureScheme::ECDSA_SECP384R1_SHA384,
      TTTLS13::SignatureScheme::ECDSA_SECP521R1_SHA512,
      TTTLS13::SignatureScheme::RSA_PSS_RSAE_SHA256,
      TTTLS13::SignatureScheme::RSA_PSS_RSAE_SHA384,
      TTTLS13::SignatureScheme::RSA_PSS_RSAE_SHA512,
      TTTLS13::SignatureScheme::RSA_PKCS1_SHA256,
      TTTLS13::SignatureScheme::RSA_PKCS1_SHA384,
      TTTLS13::SignatureScheme::RSA_PKCS1_SHA512
    ]
  )

  # supported_groups
  groups = [
    TTTLS13::NamedGroup::SECP256R1,
    TTTLS13::NamedGroup::SECP384R1,
    TTTLS13::NamedGroup::SECP521R1
  ]
  exs << TTTLS13::Message::Extension::SupportedGroups.new(groups)

  # key_share
  key_share, shared_secret = TTTLS13::Message::Extension::KeyShare.gen_ch_key_share(
    groups
  )
  exs << key_share

  [exs, shared_secret]
end

.gen_newch_extensions(ch1, hrr) ⇒ TTTLS13::Message::Extensions

Parameters:

  • ch1 (TTTLS13::Message::ClientHello)
  • hrr (TTTLS13::Message::ServerHello)

Returns:

  • (TTTLS13::Message::Extensions) 


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# File 'lib/echspec/tls13_client.rb', line 82

def gen_newch_extensions(ch1, hrr)
  exs = TTTLS13::Message::Extensions.new
  # key_share
  if hrr.extensions.include?(TTTLS13::Message::ExtensionType::KEY_SHARE)
    group = hrr.extensions[TTTLS13::Message::ExtensionType::KEY_SHARE]
               .key_share_entry.first.group
    key_share, = TTTLS13::Message::Extension::KeyShare.gen_ch_key_share([group])
    exs << key_share
  end

  # cookie
  exs << hrr.extensions[TTTLS13::Message::ExtensionType::COOKIE] \
    if hrr.extensions.include?(TTTLS13::Message::ExtensionType::COOKIE)

  ch1.extensions.merge(exs)
end

.recv_hrr(socket, hostname, ech_config, stack) ⇒ EchSpec::TLS13Client::Connection, ...

rubocop: disable Metrics/MethodLength

Parameters:

Returns:

  • (EchSpec::TLS13Client::Connection)
  • (TTTLS13::Message::ClientHello) —

    ClientHelloInner

  • (TTTLS13::Message::ClientHello)
  • (TTTLS13::Message::ServerHello) —

    HelloRetryRequest

  • (TTTLS13::EchState)

Raises:



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# File 'lib/echspec/tls13_client.rb', line 199

def recv_hrr(socket, hostname, ech_config, stack)
  # send 1st ClientHello
  conn = TLS13Client::Connection.new(socket, :client)
  inner_ech = TTTLS13::Message::Extension::ECHClientHello.new_inner
  exs, = TLS13Client.gen_ch_extensions(hostname)
  # for HRR
  key_share = TTTLS13::Message::Extension::KeyShare.new(
    msg_type: TTTLS13::Message::HandshakeType::CLIENT_HELLO,
    key_share_entry: [] # empty client_shares vector
  )
  exs[TTTLS13::Message::ExtensionType::KEY_SHARE] = key_share
  inner = TTTLS13::Message::ClientHello.new(
    cipher_suites: TTTLS13::CipherSuites.new(
      [
        TTTLS13::CipherSuite::TLS_AES_256_GCM_SHA384,
        TTTLS13::CipherSuite::TLS_CHACHA20_POLY1305_SHA256,
        TTTLS13::CipherSuite::TLS_AES_128_GCM_SHA256
      ]
    ),
    extensions: exs.merge(
      TTTLS13::Message::ExtensionType::ENCRYPTED_CLIENT_HELLO => inner_ech
    )
  )
  stack << inner

  selector = proc { |x| TLS13Client.select_ech_hpke_cipher_suite(x) }
  ch, _inner, ech_state = TTTLS13::Ech.offer_ech(inner, ech_config, selector)
  conn.send_record(
    TTTLS13::Message::Record.new(
      type: TTTLS13::Message::ContentType::HANDSHAKE,
      messages: [ch],
      cipher: TTTLS13::Cryptograph::Passer.new
    )
  )
  stack << ch

  # receive HelloRetryRequest
  recv, = conn.recv_message(TTTLS13::Cryptograph::Passer.new)
  stack << recv
  raise Error::BeforeTargetSituationError, 'did not send expected handshake message: HelloRetryRequest' \
    unless recv.is_a?(TTTLS13::Message::ServerHello) && recv.hrr?

  [conn, inner, ch, recv, ech_state]
end

.select_ech_hpke_cipher_suite(conf) ⇒ Boolean

Parameters:

  • conf (ECHConfig::ECHConfigContents::HpkeKeyConfig)

Returns:

  • (Boolean) 


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# File 'lib/echspec/tls13_client.rb', line 180

def select_ech_hpke_cipher_suite(conf)
  TTTLS13::STANDARD_CLIENT_ECH_HPKE_SYMMETRIC_CIPHER_SUITES.find do |cs|
    conf.cipher_suites.include?(cs)
  end
end

.send_ch_with_greased_ech(socket, hostname, stack = nil) ⇒ TTTLS13::Message::EncryptedExtensions

rubocop: disable Metrics/AbcSize rubocop: disable Metrics/CyclomaticComplexity rubocop: disable Metrics/MethodLength rubocop: disable Metrics/PerceivedComplexity

Parameters:

Returns:

  • (TTTLS13::Message::EncryptedExtensions)

Raises:



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# File 'lib/echspec/tls13_client.rb', line 110

def send_ch_with_greased_ech(socket, hostname, stack = nil)
  conn = TLS13Client::Connection.new(socket, :client)
  inner_ech = TTTLS13::Message::Extension::ECHClientHello.new_inner
  exs, shared_secret = TLS13Client.gen_ch_extensions(hostname)
  inner = TTTLS13::Message::ClientHello.new(
    cipher_suites: TTTLS13::CipherSuites.new(
      [
        TTTLS13::CipherSuite::TLS_AES_256_GCM_SHA384,
        TTTLS13::CipherSuite::TLS_CHACHA20_POLY1305_SHA256,
        TTTLS13::CipherSuite::TLS_AES_128_GCM_SHA256
      ]
    ),
    extensions: exs.merge(
      TTTLS13::Message::ExtensionType::ENCRYPTED_CLIENT_HELLO => inner_ech
    )
  )
  stack << inner if stack

  ch = TTTLS13::Ech.new_greased_ch(inner, TTTLS13::Ech.new_grease_ech)
  conn.send_record(
    TTTLS13::Message::Record.new(
      type: TTTLS13::Message::ContentType::HANDSHAKE,
      messages: [ch],
      cipher: TTTLS13::Cryptograph::Passer.new
    )
  )
  stack << ch if stack

  recv, = conn.recv_message(TTTLS13::Cryptograph::Passer.new)
  stack << recv if stack
  raise Error::BeforeTargetSituationError, 'not received ServerHello' \
    unless recv.is_a?(TTTLS13::Message::ServerHello) && !recv.hrr?

  transcript = TTTLS13::Transcript.new
  transcript[TTTLS13::CH] = [ch, ch.serialize]
  sh = recv
  transcript[TTTLS13::SH] = [sh, sh.serialize]
  kse = sh.extensions[TTTLS13::Message::ExtensionType::KEY_SHARE]
          .key_share_entry.first
  key_schedule = TTTLS13::KeySchedule.new(
    psk: nil,
    shared_secret: shared_secret.build(kse.group, kse.key_exchange),
    cipher_suite: sh.cipher_suite,
    transcript:
  )
  hs_rcipher = TTTLS13::Endpoint.gen_cipher(
    sh.cipher_suite,
    key_schedule.server_handshake_write_key,
    key_schedule.server_handshake_write_iv
  )
  recv, = conn.recv_message(hs_rcipher)
  stack << recv if stack
  if recv.is_a?(TTTLS13::Message::ChangeCipherSpec)
    recv, = conn.recv_message(hs_rcipher)
    stack << recv if stack
  end

  raise Error::BeforeTargetSituationError, 'not received EncryptedExtensions' \
    unless recv.is_a?(TTTLS13::Message::EncryptedExtensions)

  recv
end