feat: add temporary support for go1.23 (#2)

still need to use by passing `-ldflags=-checklinkname=0` to gc

tls_1.21.go

@@ -1,4 +1,4 @@
-//go:build go1.21
+//go:build go1.21 && !go1.23
 
 package terasu
 

tls_1.23.go

@@ -0,0 +1,274 @@
+//go:build go1.23
+
+package terasu
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"hash"
+	"io"
+	"net"
+	"sync"
+	"sync/atomic"
+	"unsafe"
+	_ "unsafe"
+)
+
+type recordType uint8
+
+const (
+	recordTypeChangeCipherSpec recordType = 20
+	recordTypeAlert            recordType = 21
+	recordTypeHandshake        recordType = 22
+	recordTypeApplicationData  recordType = 23
+)
+
+const (
+	recordHeaderLen = 5 // record header length
+)
+
+type alert uint8
+
+//go:linkname alertError tls.(tls.alert).Error
+func alertError(e alert) string
+
+func (e alert) Error() string {
+	return alertError(e)
+}
+
+// A halfConn represents one direction of the record layer
+// connection, either sending or receiving.
+type halfConn struct {
+	sync.Mutex
+
+	err     error  // first permanent error
+	version uint16 // protocol version
+	cipher  any    // cipher algorithm
+	mac     hash.Hash
+	seq     [8]byte // 64-bit sequence number
+
+	scratchBuf [13]byte // to avoid allocs; interface method args escape
+
+	nextCipher any       // next encryption state
+	nextMac    hash.Hash // next MAC algorithm
+
+	level         tls.QUICEncryptionLevel // current QUIC encryption level
+	trafficSecret []byte                  // current TLS 1.3 traffic secret
+}
+
+type Conn tls.Conn
+
+// A _trsconn represents a secured connection.
+// It implements the net._trsconn interface.
+type _trsconn struct {
+	// constant
+	conn        net.Conn
+	isClient    bool
+	handshakeFn func(context.Context) error // (*Conn).clientHandshake or serverHandshake
+	quic        *uintptr                    // nil for non-QUIC connections
+
+	// isHandshakeComplete is true if the connection is currently transferring
+	// application data (i.e. is not currently processing a handshake).
+	// isHandshakeComplete is true implies handshakeErr == nil.
+	isHandshakeComplete atomic.Bool
+	// constant after handshake; protected by handshakeMutex
+	handshakeMutex sync.Mutex
+	handshakeErr   error       // error resulting from handshake
+	vers           uint16      // TLS version
+	haveVers       bool        // version has been negotiated
+	config         *tls.Config // configuration passed to constructor
+	// handshakes counts the number of handshakes performed on the
+	// connection so far. If renegotiation is disabled then this is either
+	// zero or one.
+	handshakes       int
+	extMasterSecret  bool
+	didResume        bool // whether this connection was a session resumption
+	didHRR           bool // whether a HelloRetryRequest was sent/received
+	cipherSuite      uint16
+	curveID          tls.CurveID
+	ocspResponse     []byte   // stapled OCSP response
+	scts             [][]byte // signed certificate timestamps from server
+	peerCertificates []*x509.Certificate
+	// activeCertHandles contains the cache handles to certificates in
+	// peerCertificates that are used to track active references.
+	activeCertHandles []*uintptr
+	// verifiedChains contains the certificate chains that we built, as
+	// opposed to the ones presented by the server.
+	verifiedChains [][]*x509.Certificate
+	// serverName contains the server name indicated by the client, if any.
+	serverName string
+	// secureRenegotiation is true if the server echoed the secure
+	// renegotiation extension. (This is meaningless as a server because
+	// renegotiation is not supported in that case.)
+	secureRenegotiation bool
+	// ekm is a closure for exporting keying material.
+	ekm func(label string, context []byte, length int) ([]byte, error)
+	// resumptionSecret is the resumption_master_secret for handling
+	// or sending NewSessionTicket messages.
+	resumptionSecret []byte
+	echAccepted      bool
+
+	// ticketKeys is the set of active session ticket keys for this
+	// connection. The first one is used to encrypt new tickets and
+	// all are tried to decrypt tickets.
+	ticketKeys []byte
+
+	// clientFinishedIsFirst is true if the client sent the first Finished
+	// message during the most recent handshake. This is recorded because
+	// the first transmitted Finished message is the tls-unique
+	// channel-binding value.
+	clientFinishedIsFirst bool
+
+	// closeNotifyErr is any error from sending the alertCloseNotify record.
+	closeNotifyErr error
+	// closeNotifySent is true if the Conn attempted to send an
+	// alertCloseNotify record.
+	closeNotifySent bool
+
+	// clientFinished and serverFinished contain the Finished message sent
+	// by the client or server in the most recent handshake. This is
+	// retained to support the renegotiation extension and tls-unique
+	// channel-binding.
+	clientFinished [12]byte
+	serverFinished [12]byte
+
+	// clientProtocol is the negotiated ALPN protocol.
+	clientProtocol string
+
+	// input/output
+	in, out halfConn
+}
+
+//go:linkname outBufPool crypto/tls.outBufPool
+var outBufPool sync.Pool
+
+//go:linkname tlsWriteRecordLocked crypto/tls.(*Conn).writeRecordLocked
+func tlsWriteRecordLocked(c *_trsconn, typ recordType, data []byte) (int, error)
+
+//go:linkname maxPayloadSizeForWrite crypto/tls.(*Conn).maxPayloadSizeForWrite
+func maxPayloadSizeForWrite(c *_trsconn, typ recordType) int
+
+func (c *_trsconn) maxPayloadSizeForWrite(typ recordType) int {
+	return maxPayloadSizeForWrite(c, typ)
+}
+
+//go:linkname sliceForAppend crypto/tls.sliceForAppend
+func sliceForAppend(in []byte, n int) (head, tail []byte)
+
+//go:linkname encrypt crypto/tls.(*halfConn).encrypt
+func encrypt(hc *halfConn, record, payload []byte, rand io.Reader) ([]byte, error)
+
+func (hc *halfConn) encrypt(record, payload []byte, rand io.Reader) ([]byte, error) {
+	return encrypt(hc, record, payload, rand)
+}
+
+//go:linkname rand crypto/tls.(*Config).rand
+func rand(c *tls.Config) io.Reader
+
+//go:linkname write crypto/tls.(*Conn).write
+func write(c *_trsconn, data []byte) (int, error)
+
+func (c *_trsconn) write(data []byte) (int, error) {
+	return write(c, data)
+}
+
+//go:linkname flush crypto/tls.(*Conn).flush
+func flush(c *_trsconn) (int, error)
+
+func (c *_trsconn) flush() (int, error) {
+	return flush(c)
+}
+
+//go:linkname changeCipherSpec crypto/tls.(*halfConn).changeCipherSpec
+func changeCipherSpec(hc *halfConn) error
+
+func (hc *halfConn) changeCipherSpec() error {
+	return changeCipherSpec(hc)
+}
+
+//go:linkname sendAlertLocked crypto/tls.(*Conn).sendAlertLocked
+func sendAlertLocked(c *_trsconn, err alert) error
+
+func (c *_trsconn) sendAlertLocked(err alert) error {
+	return sendAlertLocked(c, err)
+}
+
+// writeRecordLocked writes a TLS record with the given type and payload to the
+// connection and updates the record layer state.
+func (c *_trsconn) writeRecordLocked(typ recordType, firstFragmentLen uint8, data []byte) (int, error) {
+	if c.quic != nil {
+		return tlsWriteRecordLocked(c, typ, data)
+	}
+
+	outBufPtr := outBufPool.Get().(*[]byte)
+	outBuf := *outBufPtr
+	defer func() {
+		// You might be tempted to simplify this by just passing &outBuf to Put,
+		// but that would make the local copy of the outBuf slice header escape
+		// to the heap, causing an allocation. Instead, we keep around the
+		// pointer to the slice header returned by Get, which is already on the
+		// heap, and overwrite and return that.
+		*outBufPtr = outBuf
+		outBufPool.Put(outBufPtr)
+	}()
+
+	var n int
+	isFirstLoop := true
+	for len(data) > 0 {
+		m := len(data)
+		if !isFirstLoop {
+			if maxPayload := c.maxPayloadSizeForWrite(typ); m > maxPayload {
+				m = maxPayload
+			}
+		} else {
+			m = int(firstFragmentLen)
+		}
+
+		_, outBuf = sliceForAppend(outBuf[:0], recordHeaderLen)
+		outBuf[0] = byte(typ)
+		vers := c.vers
+		if vers == 0 {
+			// Some TLS servers fail if the record version is
+			// greater than TLS 1.0 for the initial ClientHello.
+			vers = tls.VersionTLS10
+		} else if vers == tls.VersionTLS13 {
+			// TLS 1.3 froze the record layer version to 1.2.
+			// See RFC 8446, Section 5.1.
+			vers = tls.VersionTLS12
+		}
+		outBuf[1] = byte(vers >> 8)
+		outBuf[2] = byte(vers)
+		outBuf[3] = byte(m >> 8)
+		outBuf[4] = byte(m)
+
+		var err error
+		outBuf, err = c.out.encrypt(outBuf, data[:m], rand(c.config))
+		if err != nil {
+			return n, err
+		}
+		if _, err := c.write(outBuf); err != nil {
+			return n, err
+		}
+		n += m
+		data = data[m:]
+		if isFirstLoop {
+			isFirstLoop = false
+			if _, err := c.flush(); err != nil {
+				return n, err
+			}
+		}
+	}
+
+	if typ == recordTypeChangeCipherSpec && c.vers != tls.VersionTLS13 {
+		if err := c.out.changeCipherSpec(); err != nil {
+			return n, c.sendAlertLocked(alert(
+				*(*uintptr)(
+					unsafe.Add(unsafe.Pointer(&err), unsafe.Sizeof(uintptr(0))),
+				),
+			))
+		}
+	}
+
+	return n, nil
+}