route/vendor/github.com/bifurcation/mint/tls.go

180 lines
4.8 KiB
Go

package mint
// XXX(rlb): This file is borrowed pretty much wholesale from crypto/tls
import (
"errors"
"net"
"strings"
"time"
)
// Server returns a new TLS server side connection
// using conn as the underlying transport.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Server(conn net.Conn, config *Config) *Conn {
return NewConn(conn, config, false)
}
// Client returns a new TLS client side connection
// using conn as the underlying transport.
// The config cannot be nil: users must set either ServerName or
// InsecureSkipVerify in the config.
func Client(conn net.Conn, config *Config) *Conn {
return NewConn(conn, config, true)
}
// A listener implements a network listener (net.Listener) for TLS connections.
type Listener struct {
net.Listener
config *Config
}
// Accept waits for and returns the next incoming TLS connection.
// The returned connection c is a *tls.Conn.
func (l *Listener) Accept() (c net.Conn, err error) {
c, err = l.Listener.Accept()
if err != nil {
return
}
server := Server(c, l.config)
err = server.Handshake()
if err == AlertNoAlert {
err = nil
}
c = server
return
}
// NewListener creates a Listener which accepts connections from an inner
// Listener and wraps each connection with Server.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func NewListener(inner net.Listener, config *Config) (net.Listener, error) {
if config != nil && config.NonBlocking {
return nil, errors.New("listening not possible in non-blocking mode")
}
l := new(Listener)
l.Listener = inner
l.config = config
return l, nil
}
// Listen creates a TLS listener accepting connections on the
// given network address using net.Listen.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Listen(network, laddr string, config *Config) (net.Listener, error) {
if config == nil || !config.ValidForServer() {
return nil, errors.New("tls: neither Certificates nor GetCertificate set in Config")
}
l, err := net.Listen(network, laddr)
if err != nil {
return nil, err
}
return NewListener(l, config)
}
type TimeoutError struct{}
func (TimeoutError) Error() string { return "tls: DialWithDialer timed out" }
func (TimeoutError) Timeout() bool { return true }
func (TimeoutError) Temporary() bool { return true }
// DialWithDialer connects to the given network address using dialer.Dial and
// then initiates a TLS handshake, returning the resulting TLS connection. Any
// timeout or deadline given in the dialer apply to connection and TLS
// handshake as a whole.
//
// DialWithDialer interprets a nil configuration as equivalent to the zero
// configuration; see the documentation of Config for the defaults.
func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
if config != nil && config.NonBlocking {
return nil, errors.New("dialing not possible in non-blocking mode")
}
// We want the Timeout and Deadline values from dialer to cover the
// whole process: TCP connection and TLS handshake. This means that we
// also need to start our own timers now.
timeout := dialer.Timeout
if !dialer.Deadline.IsZero() {
deadlineTimeout := dialer.Deadline.Sub(time.Now())
if timeout == 0 || deadlineTimeout < timeout {
timeout = deadlineTimeout
}
}
var errChannel chan error
if timeout != 0 {
errChannel = make(chan error, 2)
time.AfterFunc(timeout, func() {
errChannel <- TimeoutError{}
})
}
rawConn, err := dialer.Dial(network, addr)
if err != nil {
return nil, err
}
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
if config == nil {
config = &Config{}
} else {
config = config.Clone()
}
// If no ServerName is set, infer the ServerName
// from the hostname we're connecting to.
if config.ServerName == "" {
config.ServerName = hostname
}
// Set up DTLS as needed.
config.UseDTLS = (network == "udp")
conn := Client(rawConn, config)
if timeout == 0 {
err = conn.Handshake()
if err == AlertNoAlert {
err = nil
}
} else {
go func() {
errChannel <- conn.Handshake()
}()
err = <-errChannel
if err == AlertNoAlert {
err = nil
}
}
if err != nil {
rawConn.Close()
return nil, err
}
return conn, nil
}
// Dial connects to the given network address using net.Dial
// and then initiates a TLS handshake, returning the resulting
// TLS connection.
// Dial interprets a nil configuration as equivalent to
// the zero configuration; see the documentation of Config
// for the defaults.
func Dial(network, addr string, config *Config) (*Conn, error) {
return DialWithDialer(new(net.Dialer), network, addr, config)
}