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listener.go
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listener.go
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package server
import (
"github.com/hashicorp/errwrap"
// We must import sha512 so that it registers with the runtime so that
// certificates that use it can be parsed.
_ "crypto/sha512"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"io/ioutil"
"net"
"github.com/hashicorp/vault/helper/parseutil"
"github.com/hashicorp/vault/helper/proxyutil"
"github.com/hashicorp/vault/helper/reload"
"github.com/hashicorp/vault/helper/tlsutil"
"github.com/mitchellh/cli"
)
// ListenerFactory is the factory function to create a listener.
type ListenerFactory func(map[string]interface{}, io.Writer, cli.Ui) (net.Listener, map[string]string, reload.ReloadFunc, error)
// BuiltinListeners is the list of built-in listener types.
var BuiltinListeners = map[string]ListenerFactory{
"tcp": tcpListenerFactory,
}
// NewListener creates a new listener of the given type with the given
// configuration. The type is looked up in the BuiltinListeners map.
func NewListener(t string, config map[string]interface{}, logger io.Writer, ui cli.Ui) (net.Listener, map[string]string, reload.ReloadFunc, error) {
f, ok := BuiltinListeners[t]
if !ok {
return nil, nil, nil, fmt.Errorf("unknown listener type: %q", t)
}
return f(config, logger, ui)
}
func listenerWrapProxy(ln net.Listener, config map[string]interface{}) (net.Listener, error) {
behaviorRaw, ok := config["proxy_protocol_behavior"]
if !ok {
return ln, nil
}
behavior, ok := behaviorRaw.(string)
if !ok {
return nil, fmt.Errorf("failed parsing proxy_protocol_behavior value: not a string")
}
proxyProtoConfig := &proxyutil.ProxyProtoConfig{
Behavior: behavior,
}
if proxyProtoConfig.Behavior == "allow_authorized" || proxyProtoConfig.Behavior == "deny_unauthorized" {
authorizedAddrsRaw, ok := config["proxy_protocol_authorized_addrs"]
if !ok {
return nil, fmt.Errorf("proxy_protocol_behavior set but no proxy_protocol_authorized_addrs value")
}
if err := proxyProtoConfig.SetAuthorizedAddrs(authorizedAddrsRaw); err != nil {
return nil, errwrap.Wrapf("failed parsing proxy_protocol_authorized_addrs: {{err}}", err)
}
}
newLn, err := proxyutil.WrapInProxyProto(ln, proxyProtoConfig)
if err != nil {
return nil, errwrap.Wrapf("failed configuring PROXY protocol wrapper: {{err}}", err)
}
return newLn, nil
}
func listenerWrapTLS(
ln net.Listener,
props map[string]string,
config map[string]interface{},
ui cli.Ui) (net.Listener, map[string]string, reload.ReloadFunc, error) {
props["tls"] = "disabled"
if v, ok := config["tls_disable"]; ok {
disabled, err := parseutil.ParseBool(v)
if err != nil {
return nil, nil, nil, errwrap.Wrapf("invalid value for 'tls_disable': {{err}}", err)
}
if disabled {
return ln, props, nil, nil
}
}
certFileRaw, ok := config["tls_cert_file"]
if !ok {
return nil, nil, nil, fmt.Errorf("'tls_cert_file' must be set")
}
certFile := certFileRaw.(string)
keyFileRaw, ok := config["tls_key_file"]
if !ok {
return nil, nil, nil, fmt.Errorf("'tls_key_file' must be set")
}
keyFile := keyFileRaw.(string)
cg := reload.NewCertificateGetter(certFile, keyFile, "")
if err := cg.Reload(config); err != nil {
// We try the key without a passphrase first and if we get an incorrect
// passphrase response, try again after prompting for a passphrase
if errwrap.Contains(err, x509.IncorrectPasswordError.Error()) {
var passphrase string
passphrase, err = ui.AskSecret(fmt.Sprintf("Enter passphrase for %s:", keyFile))
if err == nil {
cg = reload.NewCertificateGetter(certFile, keyFile, passphrase)
if err = cg.Reload(config); err == nil {
goto PASSPHRASECORRECT
}
}
}
return nil, nil, nil, errwrap.Wrapf("error loading TLS cert: {{err}}", err)
}
PASSPHRASECORRECT:
var tlsvers string
tlsversRaw, ok := config["tls_min_version"]
if !ok {
tlsvers = "tls12"
} else {
tlsvers = tlsversRaw.(string)
}
tlsConf := &tls.Config{}
tlsConf.GetCertificate = cg.GetCertificate
tlsConf.NextProtos = []string{"h2", "http/1.1"}
tlsConf.MinVersion, ok = tlsutil.TLSLookup[tlsvers]
if !ok {
return nil, nil, nil, fmt.Errorf("'tls_min_version' value %q not supported, please specify one of [tls10,tls11,tls12]", tlsvers)
}
tlsConf.ClientAuth = tls.RequestClientCert
if v, ok := config["tls_cipher_suites"]; ok {
ciphers, err := tlsutil.ParseCiphers(v.(string))
if err != nil {
return nil, nil, nil, errwrap.Wrapf("invalid value for 'tls_cipher_suites': {{err}}", err)
}
tlsConf.CipherSuites = ciphers
}
if v, ok := config["tls_prefer_server_cipher_suites"]; ok {
preferServer, err := parseutil.ParseBool(v)
if err != nil {
return nil, nil, nil, errwrap.Wrapf("invalid value for 'tls_prefer_server_cipher_suites': {{err}}", err)
}
tlsConf.PreferServerCipherSuites = preferServer
}
var requireVerifyCerts bool
var err error
if v, ok := config["tls_require_and_verify_client_cert"]; ok {
requireVerifyCerts, err = parseutil.ParseBool(v)
if err != nil {
return nil, nil, nil, errwrap.Wrapf("invalid value for 'tls_require_and_verify_client_cert': {{err}}", err)
}
if requireVerifyCerts {
tlsConf.ClientAuth = tls.RequireAndVerifyClientCert
}
if tlsClientCaFile, ok := config["tls_client_ca_file"]; ok {
caPool := x509.NewCertPool()
data, err := ioutil.ReadFile(tlsClientCaFile.(string))
if err != nil {
return nil, nil, nil, errwrap.Wrapf("failed to read tls_client_ca_file: {{err}}", err)
}
if !caPool.AppendCertsFromPEM(data) {
return nil, nil, nil, fmt.Errorf("failed to parse CA certificate in tls_client_ca_file")
}
tlsConf.ClientCAs = caPool
}
}
if v, ok := config["tls_disable_client_certs"]; ok {
disableClientCerts, err := parseutil.ParseBool(v)
if err != nil {
return nil, nil, nil, errwrap.Wrapf("invalid value for 'tls_disable_client_certs': {{err}}", err)
}
if disableClientCerts && requireVerifyCerts {
return nil, nil, nil, fmt.Errorf("'tls_disable_client_certs' and 'tls_require_and_verify_client_cert' are mutually exclusive")
}
if disableClientCerts {
tlsConf.ClientAuth = tls.NoClientCert
}
}
ln = tls.NewListener(ln, tlsConf)
props["tls"] = "enabled"
return ln, props, cg.Reload, nil
}