tlsutil

Documentation

Index

• Variables
• func ParseCiphers(cipherStr string) ([]uint16, error)
• func WrapTLSClient(conn net.Conn, tlsConfig *tls.Config) (net.Conn, error)
• type Config
  • func (c *Config) AppendCA(pool *x509.CertPool) error
  • func (c *Config) IncomingTLSConfig() (*tls.Config, error)
  • func (c *Config) KeyPair() (*tls.Certificate, error)
  • func (c *Config) OutgoingTLSConfig() (*tls.Config, error)
  • func (c *Config) OutgoingTLSWrapper() (DCWrapper, error)
• type DCWrapper
• type Wrapper
  • func SpecificDC(dc string, tlsWrap DCWrapper) Wrapper

Variables

var TLSLookup = map[string]uint16{
	"tls10": tls.VersionTLS10,
	"tls11": tls.VersionTLS11,
	"tls12": tls.VersionTLS12,
}

TLSLookup maps the tls_min_version configuration to the internal value

Functions

func ParseCiphers

func ParseCiphers(cipherStr string) ([]uint16, error)

ParseCiphers parse ciphersuites from the comma-separated string into recognized slice

func WrapTLSClient

func WrapTLSClient(conn net.Conn, tlsConfig *tls.Config) (net.Conn, error)

Wrap a net.Conn into a client tls connection, performing any additional verification as needed.

As of go 1.3, crypto/tls only supports either doing no certificate verification, or doing full verification including of the peer's DNS name. For consul, we want to validate that the certificate is signed by a known CA, but because consul doesn't use DNS names for node names, we don't verify the certificate DNS names. Since go 1.3 no longer supports this mode of operation, we have to do it manually.

Types

type Config

type Config struct {
	// VerifyIncoming is used to verify the authenticity of incoming connections.
	// This means that TCP requests are forbidden, only allowing for TLS. TLS connections
	// must match a provided certificate authority. This can be used to force client auth.
	VerifyIncoming bool

	// VerifyOutgoing is used to verify the authenticity of outgoing connections.
	// This means that TLS requests are used, and TCP requests are not made. TLS connections
	// must match a provided certificate authority. This is used to verify authenticity of
	// server nodes.
	VerifyOutgoing bool

	// VerifyServerHostname is used to enable hostname verification of servers. This
	// ensures that the certificate presented is valid for server.<datacenter>.<domain>.
	// This prevents a compromised client from being restarted as a server, and then
	// intercepting request traffic as well as being added as a raft peer. This should be
	// enabled by default with VerifyOutgoing, but for legacy reasons we cannot break
	// existing clients.
	VerifyServerHostname bool

	// CAFile is a path to a certificate authority file. This is used with VerifyIncoming
	// or VerifyOutgoing to verify the TLS connection.
	CAFile string

	// CAPath is a path to a directory containing certificate authority files. This is used
	// with VerifyIncoming or VerifyOutgoing to verify the TLS connection.
	CAPath string

	// CertFile is used to provide a TLS certificate that is used for serving TLS connections.
	// Must be provided to serve TLS connections.
	CertFile string

	// KeyFile is used to provide a TLS key that is used for serving TLS connections.
	// Must be provided to serve TLS connections.
	KeyFile string

	// Node name is the name we use to advertise. Defaults to hostname.
	NodeName string

	// ServerName is used with the TLS certificate to ensure the name we
	// provide matches the certificate
	ServerName string

	// Domain is the Consul TLD being used. Defaults to "consul."
	Domain string

	// TLSMinVersion is the minimum accepted TLS version that can be used.
	TLSMinVersion string

	// CipherSuites is the list of TLS cipher suites to use.
	CipherSuites []uint16

	// PreferServerCipherSuites specifies whether to prefer the server's ciphersuite
	// over the client ciphersuites.
	PreferServerCipherSuites bool
}

Config used to create tls.Config

func (*Config) AppendCA

func (c *Config) AppendCA(pool *x509.CertPool) error

AppendCA opens and parses the CA file and adds the certificates to the provided CertPool.

func (*Config) IncomingTLSConfig

func (c *Config) IncomingTLSConfig() (*tls.Config, error)

IncomingTLSConfig generates a TLS configuration for incoming requests

func (*Config) KeyPair

func (c *Config) KeyPair() (*tls.Certificate, error)

KeyPair is used to open and parse a certificate and key file

func (*Config) OutgoingTLSConfig

func (c *Config) OutgoingTLSConfig() (*tls.Config, error)

OutgoingTLSConfig generates a TLS configuration for outgoing requests. It will return a nil config if this configuration should not use TLS for outgoing connections.

func (*Config) OutgoingTLSWrapper

func (c *Config) OutgoingTLSWrapper() (DCWrapper, error)

OutgoingTLSWrapper returns a a DCWrapper based on the OutgoingTLS configuration. If hostname verification is on, the wrapper will properly generate the dynamic server name for verification.

type DCWrapper

type DCWrapper func(dc string, conn net.Conn) (net.Conn, error)

DCWrapper is a function that is used to wrap a non-TLS connection and returns an appropriate TLS connection or error. This takes a datacenter as an argument.

type Wrapper

type Wrapper func(conn net.Conn) (net.Conn, error)

Wrapper is a variant of DCWrapper, where the DC is provided as a constant value. This is usually done by currying DCWrapper.

func SpecificDC

func SpecificDC(dc string, tlsWrap DCWrapper) Wrapper

SpecificDC is used to invoke a static datacenter and turns a DCWrapper into a Wrapper type.