Reorganization and Addition: Move TLS types and config out of the out…

…puts and support server options. (elastic#7054)

* Reorganization and Addition: Move TLS types and config out of the outputs and support server options.

When working on the TLS TCP it was a bit strange to import a
package coming from the outputs; this commit addresses a few things:

- Move the `outputs/tls.go` and `transport/tls.go` into the common
under the transport folder.
- Add shims to make sure we keep backward compatibility on anything that
could be using theses classes.
- Extract common logic code to be reusable.
- Add inverse mapper for TLSVersion and tlsCiphersuite, to give a uint
and get the human string.
- Add a new `ServerConfig` config struct.

*This is a light refactoring, mostly moving code and adding a few
tests.

Fixes: elastic#6079

* Adding: Developer changelog

* rename client_authentification to client_authentication

I think my french influence slipped on that one.

* authenfitication -> authentication

CHANGELOG-developer.asciidoc

@@ -20,6 +20,7 @@ The list below covers the major changes between 6.3.0 and master only.
 ==== Breaking changes
 
 - The beat.Pipeline is now passed to cfgfile.RunnerFactory. Beats using libbeat for module reloading or autodiscovery need to be adapted. {pull}7018[7017]
+- Moving of TLS helper functions and structs from `output/tls` to `tlscommon`. {pull}7054[7054]
 
 
 ==== Added

libbeat/common/transport/tlscommon/ca_test.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIJKAIBAAKCAgEAv8IiJDAIDl+roQOWe+oSq46Nyuu9R+Iis0V1i6M7zA6Qijbx
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+-----END RSA PRIVATE KEY-----

libbeat/common/transport/tlscommon/ca_test.pem

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
+MIIFTDCCAzSgAwIBAgIRAOAMlgVxz4G+Zj/EtBTvpg4wDQYJKoZIhvcNAQENBQAw
+LzELMAkGA1UEBhMCVVMxEDAOBgNVBAoTB2VsYXN0aWMxDjAMBgNVBAsTBWJlYXRz
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+morZ618ezCBBqxHsDF6DCA==
+-----END CERTIFICATE-----

libbeat/common/transport/tlscommon/config.go

@@ -0,0 +1,86 @@
+package tlscommon
+
+import (
+	"crypto/tls"
+
+	"github.com/joeshaw/multierror"
+)
+
+// Config defines the user configurable options in the yaml file.
+type Config struct {
+	Enabled          *bool                   `config:"enabled"`
+	VerificationMode TLSVerificationMode     `config:"verification_mode"` // one of 'none', 'full'
+	Versions         []TLSVersion            `config:"supported_protocols"`
+	CipherSuites     []tlsCipherSuite        `config:"cipher_suites"`
+	CAs              []string                `config:"certificate_authorities"`
+	Certificate      CertificateConfig       `config:",inline"`
+	CurveTypes       []tlsCurveType          `config:"curve_types"`
+	Renegotiation    tlsRenegotiationSupport `config:"renegotiation"`
+}
+
+// LoadTLSConfig will load a certificate from config with all TLS based keys
+// defined. If Certificate and CertificateKey are configured, client authentication
+// will be configured. If no CAs are configured, the host CA will be used by go
+// built-in TLS support.
+func LoadTLSConfig(config *Config) (*TLSConfig, error) {
+	if !config.IsEnabled() {
+		return nil, nil
+	}
+
+	fail := multierror.Errors{}
+	logFail := func(es ...error) {
+		for _, e := range es {
+			if e != nil {
+				fail = append(fail, e)
+			}
+		}
+	}
+
+	var cipherSuites []uint16
+	for _, suite := range config.CipherSuites {
+		cipherSuites = append(cipherSuites, uint16(suite))
+	}
+
+	var curves []tls.CurveID
+	for _, id := range config.CurveTypes {
+		curves = append(curves, tls.CurveID(id))
+	}
+
+	cert, err := LoadCertificate(&config.Certificate)
+	logFail(err)
+
+	cas, errs := LoadCertificateAuthorities(config.CAs)
+	logFail(errs...)
+
+	// fail, if any error occurred when loading certificate files
+	if err = fail.Err(); err != nil {
+		return nil, err
+	}
+
+	var certs []tls.Certificate
+	if cert != nil {
+		certs = []tls.Certificate{*cert}
+	}
+
+	// return config if no error occurred
+	return &TLSConfig{
+		Versions:         config.Versions,
+		Verification:     config.VerificationMode,
+		Certificates:     certs,
+		RootCAs:          cas,
+		CipherSuites:     cipherSuites,
+		CurvePreferences: curves,
+		Renegotiation:    tls.RenegotiationSupport(config.Renegotiation),
+	}, nil
+}
+
+// Validate valies the TLSConfig struct making sure certificate sure we have both a certificate and
+// a key.
+func (c *Config) Validate() error {
+	return c.Certificate.Validate()
+}
+
+// IsEnabled returns true if the `enable` field is set to true in the yaml.
+func (c *Config) IsEnabled() bool {
+	return c != nil && (c.Enabled == nil || *c.Enabled)
+}

libbeat/common/transport/tlscommon/server_config.go

@@ -0,0 +1,84 @@
+package tlscommon
+
+import (
+	"crypto/tls"
+
+	"github.com/joeshaw/multierror"
+)
+
+// ServerConfig defines the user configurable tls options for any TCP based service.
+type ServerConfig struct {
+	Enabled          *bool               `config:"enabled"`
+	VerificationMode TLSVerificationMode `config:"verification_mode"` // one of 'none', 'full'
+	Versions         []TLSVersion        `config:"supported_protocols"`
+	CipherSuites     []tlsCipherSuite    `config:"cipher_suites"`
+	CAs              []string            `config:"certificate_authorities"`
+	Certificate      CertificateConfig   `config:",inline"`
+	CurveTypes       []tlsCurveType      `config:"curve_types"`
+	ClientAuth       tlsClientAuth       `config:"client_authentication"` //`none`, `optional` or `required`
+}
+
+// LoadTLSServerConfig tranforms a ServerConfig into a `tls.Config` to be used directly with golang
+// network types.
+func LoadTLSServerConfig(config *ServerConfig) (*TLSConfig, error) {
+	if !config.IsEnabled() {
+		return nil, nil
+	}
+
+	fail := multierror.Errors{}
+	logFail := func(es ...error) {
+		for _, e := range es {
+			if e != nil {
+				fail = append(fail, e)
+			}
+		}
+	}
+
+	var cipherSuites []uint16
+	for _, suite := range config.CipherSuites {
+		cipherSuites = append(cipherSuites, uint16(suite))
+	}
+
+	var curves []tls.CurveID
+	for _, id := range config.CurveTypes {
+		curves = append(curves, tls.CurveID(id))
+	}
+
+	cert, err := LoadCertificate(&config.Certificate)
+	logFail(err)
+
+	cas, errs := LoadCertificateAuthorities(config.CAs)
+	logFail(errs...)
+
+	// fail, if any error occurred when loading certificate files
+	if err = fail.Err(); err != nil {
+		return nil, err
+	}
+
+	var certs []tls.Certificate
+	if cert != nil {
+		certs = []tls.Certificate{*cert}
+	}
+
+	// return config if no error occurred
+	return &TLSConfig{
+		Versions:         config.Versions,
+		Verification:     config.VerificationMode,
+		Certificates:     certs,
+		ClientCAs:        cas,
+		CipherSuites:     cipherSuites,
+		CurvePreferences: curves,
+		ClientAuth:       tls.ClientAuthType(config.ClientAuth),
+	}, nil
+}
+
+// Validate valies the TLSConfig struct making sure certificate sure we have both a certificate and
+// a key.
+func (c *ServerConfig) Validate() error {
+	return c.Certificate.Validate()
+}
+
+// IsEnabled returns true if the `enable` field is set to true in the yaml.
+func (c *ServerConfig) IsEnabled() bool {
+	return c != nil && (c.Enabled == nil || *c.Enabled)
+}