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path: root/src/pkg/crypto/tls/handshake_client.go
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Diffstat (limited to 'src/pkg/crypto/tls/handshake_client.go')
-rw-r--r--src/pkg/crypto/tls/handshake_client.go601
1 files changed, 0 insertions, 601 deletions
diff --git a/src/pkg/crypto/tls/handshake_client.go b/src/pkg/crypto/tls/handshake_client.go
deleted file mode 100644
index a320fde1b..000000000
--- a/src/pkg/crypto/tls/handshake_client.go
+++ /dev/null
@@ -1,601 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package tls
-
-import (
- "bytes"
- "crypto/ecdsa"
- "crypto/rsa"
- "crypto/subtle"
- "crypto/x509"
- "encoding/asn1"
- "errors"
- "fmt"
- "io"
- "net"
- "strconv"
-)
-
-type clientHandshakeState struct {
- c *Conn
- serverHello *serverHelloMsg
- hello *clientHelloMsg
- suite *cipherSuite
- finishedHash finishedHash
- masterSecret []byte
- session *ClientSessionState
-}
-
-func (c *Conn) clientHandshake() error {
- if c.config == nil {
- c.config = defaultConfig()
- }
-
- if len(c.config.ServerName) == 0 && !c.config.InsecureSkipVerify {
- return errors.New("tls: either ServerName or InsecureSkipVerify must be specified in the tls.Config")
- }
-
- hello := &clientHelloMsg{
- vers: c.config.maxVersion(),
- compressionMethods: []uint8{compressionNone},
- random: make([]byte, 32),
- ocspStapling: true,
- serverName: c.config.ServerName,
- supportedCurves: c.config.curvePreferences(),
- supportedPoints: []uint8{pointFormatUncompressed},
- nextProtoNeg: len(c.config.NextProtos) > 0,
- secureRenegotiation: true,
- }
-
- possibleCipherSuites := c.config.cipherSuites()
- hello.cipherSuites = make([]uint16, 0, len(possibleCipherSuites))
-
-NextCipherSuite:
- for _, suiteId := range possibleCipherSuites {
- for _, suite := range cipherSuites {
- if suite.id != suiteId {
- continue
- }
- // Don't advertise TLS 1.2-only cipher suites unless
- // we're attempting TLS 1.2.
- if hello.vers < VersionTLS12 && suite.flags&suiteTLS12 != 0 {
- continue
- }
- hello.cipherSuites = append(hello.cipherSuites, suiteId)
- continue NextCipherSuite
- }
- }
-
- _, err := io.ReadFull(c.config.rand(), hello.random)
- if err != nil {
- c.sendAlert(alertInternalError)
- return errors.New("tls: short read from Rand: " + err.Error())
- }
-
- if hello.vers >= VersionTLS12 {
- hello.signatureAndHashes = supportedSKXSignatureAlgorithms
- }
-
- var session *ClientSessionState
- var cacheKey string
- sessionCache := c.config.ClientSessionCache
- if c.config.SessionTicketsDisabled {
- sessionCache = nil
- }
-
- if sessionCache != nil {
- hello.ticketSupported = true
-
- // Try to resume a previously negotiated TLS session, if
- // available.
- cacheKey = clientSessionCacheKey(c.conn.RemoteAddr(), c.config)
- candidateSession, ok := sessionCache.Get(cacheKey)
- if ok {
- // Check that the ciphersuite/version used for the
- // previous session are still valid.
- cipherSuiteOk := false
- for _, id := range hello.cipherSuites {
- if id == candidateSession.cipherSuite {
- cipherSuiteOk = true
- break
- }
- }
-
- versOk := candidateSession.vers >= c.config.minVersion() &&
- candidateSession.vers <= c.config.maxVersion()
- if versOk && cipherSuiteOk {
- session = candidateSession
- }
- }
- }
-
- if session != nil {
- hello.sessionTicket = session.sessionTicket
- // A random session ID is used to detect when the
- // server accepted the ticket and is resuming a session
- // (see RFC 5077).
- hello.sessionId = make([]byte, 16)
- if _, err := io.ReadFull(c.config.rand(), hello.sessionId); err != nil {
- c.sendAlert(alertInternalError)
- return errors.New("tls: short read from Rand: " + err.Error())
- }
- }
-
- c.writeRecord(recordTypeHandshake, hello.marshal())
-
- msg, err := c.readHandshake()
- if err != nil {
- return err
- }
- serverHello, ok := msg.(*serverHelloMsg)
- if !ok {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(serverHello, msg)
- }
-
- vers, ok := c.config.mutualVersion(serverHello.vers)
- if !ok || vers < VersionTLS10 {
- // TLS 1.0 is the minimum version supported as a client.
- c.sendAlert(alertProtocolVersion)
- return fmt.Errorf("tls: server selected unsupported protocol version %x", serverHello.vers)
- }
- c.vers = vers
- c.haveVers = true
-
- suite := mutualCipherSuite(c.config.cipherSuites(), serverHello.cipherSuite)
- if suite == nil {
- c.sendAlert(alertHandshakeFailure)
- return fmt.Errorf("tls: server selected an unsupported cipher suite")
- }
-
- hs := &clientHandshakeState{
- c: c,
- serverHello: serverHello,
- hello: hello,
- suite: suite,
- finishedHash: newFinishedHash(c.vers),
- session: session,
- }
-
- hs.finishedHash.Write(hs.hello.marshal())
- hs.finishedHash.Write(hs.serverHello.marshal())
-
- isResume, err := hs.processServerHello()
- if err != nil {
- return err
- }
-
- if isResume {
- if err := hs.establishKeys(); err != nil {
- return err
- }
- if err := hs.readSessionTicket(); err != nil {
- return err
- }
- if err := hs.readFinished(); err != nil {
- return err
- }
- if err := hs.sendFinished(); err != nil {
- return err
- }
- } else {
- if err := hs.doFullHandshake(); err != nil {
- return err
- }
- if err := hs.establishKeys(); err != nil {
- return err
- }
- if err := hs.sendFinished(); err != nil {
- return err
- }
- if err := hs.readSessionTicket(); err != nil {
- return err
- }
- if err := hs.readFinished(); err != nil {
- return err
- }
- }
-
- if sessionCache != nil && hs.session != nil && session != hs.session {
- sessionCache.Put(cacheKey, hs.session)
- }
-
- c.didResume = isResume
- c.handshakeComplete = true
- c.cipherSuite = suite.id
- return nil
-}
-
-func (hs *clientHandshakeState) doFullHandshake() error {
- c := hs.c
-
- msg, err := c.readHandshake()
- if err != nil {
- return err
- }
- certMsg, ok := msg.(*certificateMsg)
- if !ok || len(certMsg.certificates) == 0 {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(certMsg, msg)
- }
- hs.finishedHash.Write(certMsg.marshal())
-
- certs := make([]*x509.Certificate, len(certMsg.certificates))
- for i, asn1Data := range certMsg.certificates {
- cert, err := x509.ParseCertificate(asn1Data)
- if err != nil {
- c.sendAlert(alertBadCertificate)
- return errors.New("tls: failed to parse certificate from server: " + err.Error())
- }
- certs[i] = cert
- }
-
- if !c.config.InsecureSkipVerify {
- opts := x509.VerifyOptions{
- Roots: c.config.RootCAs,
- CurrentTime: c.config.time(),
- DNSName: c.config.ServerName,
- Intermediates: x509.NewCertPool(),
- }
-
- for i, cert := range certs {
- if i == 0 {
- continue
- }
- opts.Intermediates.AddCert(cert)
- }
- c.verifiedChains, err = certs[0].Verify(opts)
- if err != nil {
- c.sendAlert(alertBadCertificate)
- return err
- }
- }
-
- switch certs[0].PublicKey.(type) {
- case *rsa.PublicKey, *ecdsa.PublicKey:
- break
- default:
- c.sendAlert(alertUnsupportedCertificate)
- return fmt.Errorf("tls: server's certificate contains an unsupported type of public key: %T", certs[0].PublicKey)
- }
-
- c.peerCertificates = certs
-
- if hs.serverHello.ocspStapling {
- msg, err = c.readHandshake()
- if err != nil {
- return err
- }
- cs, ok := msg.(*certificateStatusMsg)
- if !ok {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(cs, msg)
- }
- hs.finishedHash.Write(cs.marshal())
-
- if cs.statusType == statusTypeOCSP {
- c.ocspResponse = cs.response
- }
- }
-
- msg, err = c.readHandshake()
- if err != nil {
- return err
- }
-
- keyAgreement := hs.suite.ka(c.vers)
-
- skx, ok := msg.(*serverKeyExchangeMsg)
- if ok {
- hs.finishedHash.Write(skx.marshal())
- err = keyAgreement.processServerKeyExchange(c.config, hs.hello, hs.serverHello, certs[0], skx)
- if err != nil {
- c.sendAlert(alertUnexpectedMessage)
- return err
- }
-
- msg, err = c.readHandshake()
- if err != nil {
- return err
- }
- }
-
- var chainToSend *Certificate
- var certRequested bool
- certReq, ok := msg.(*certificateRequestMsg)
- if ok {
- certRequested = true
-
- // RFC 4346 on the certificateAuthorities field:
- // A list of the distinguished names of acceptable certificate
- // authorities. These distinguished names may specify a desired
- // distinguished name for a root CA or for a subordinate CA;
- // thus, this message can be used to describe both known roots
- // and a desired authorization space. If the
- // certificate_authorities list is empty then the client MAY
- // send any certificate of the appropriate
- // ClientCertificateType, unless there is some external
- // arrangement to the contrary.
-
- hs.finishedHash.Write(certReq.marshal())
-
- var rsaAvail, ecdsaAvail bool
- for _, certType := range certReq.certificateTypes {
- switch certType {
- case certTypeRSASign:
- rsaAvail = true
- case certTypeECDSASign:
- ecdsaAvail = true
- }
- }
-
- // We need to search our list of client certs for one
- // where SignatureAlgorithm is RSA and the Issuer is in
- // certReq.certificateAuthorities
- findCert:
- for i, chain := range c.config.Certificates {
- if !rsaAvail && !ecdsaAvail {
- continue
- }
-
- for j, cert := range chain.Certificate {
- x509Cert := chain.Leaf
- // parse the certificate if this isn't the leaf
- // node, or if chain.Leaf was nil
- if j != 0 || x509Cert == nil {
- if x509Cert, err = x509.ParseCertificate(cert); err != nil {
- c.sendAlert(alertInternalError)
- return errors.New("tls: failed to parse client certificate #" + strconv.Itoa(i) + ": " + err.Error())
- }
- }
-
- switch {
- case rsaAvail && x509Cert.PublicKeyAlgorithm == x509.RSA:
- case ecdsaAvail && x509Cert.PublicKeyAlgorithm == x509.ECDSA:
- default:
- continue findCert
- }
-
- if len(certReq.certificateAuthorities) == 0 {
- // they gave us an empty list, so just take the
- // first RSA cert from c.config.Certificates
- chainToSend = &chain
- break findCert
- }
-
- for _, ca := range certReq.certificateAuthorities {
- if bytes.Equal(x509Cert.RawIssuer, ca) {
- chainToSend = &chain
- break findCert
- }
- }
- }
- }
-
- msg, err = c.readHandshake()
- if err != nil {
- return err
- }
- }
-
- shd, ok := msg.(*serverHelloDoneMsg)
- if !ok {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(shd, msg)
- }
- hs.finishedHash.Write(shd.marshal())
-
- // If the server requested a certificate then we have to send a
- // Certificate message, even if it's empty because we don't have a
- // certificate to send.
- if certRequested {
- certMsg = new(certificateMsg)
- if chainToSend != nil {
- certMsg.certificates = chainToSend.Certificate
- }
- hs.finishedHash.Write(certMsg.marshal())
- c.writeRecord(recordTypeHandshake, certMsg.marshal())
- }
-
- preMasterSecret, ckx, err := keyAgreement.generateClientKeyExchange(c.config, hs.hello, certs[0])
- if err != nil {
- c.sendAlert(alertInternalError)
- return err
- }
- if ckx != nil {
- hs.finishedHash.Write(ckx.marshal())
- c.writeRecord(recordTypeHandshake, ckx.marshal())
- }
-
- if chainToSend != nil {
- var signed []byte
- certVerify := &certificateVerifyMsg{
- hasSignatureAndHash: c.vers >= VersionTLS12,
- }
-
- switch key := c.config.Certificates[0].PrivateKey.(type) {
- case *ecdsa.PrivateKey:
- digest, _, hashId := hs.finishedHash.hashForClientCertificate(signatureECDSA)
- r, s, err := ecdsa.Sign(c.config.rand(), key, digest)
- if err == nil {
- signed, err = asn1.Marshal(ecdsaSignature{r, s})
- }
- certVerify.signatureAndHash.signature = signatureECDSA
- certVerify.signatureAndHash.hash = hashId
- case *rsa.PrivateKey:
- digest, hashFunc, hashId := hs.finishedHash.hashForClientCertificate(signatureRSA)
- signed, err = rsa.SignPKCS1v15(c.config.rand(), key, hashFunc, digest)
- certVerify.signatureAndHash.signature = signatureRSA
- certVerify.signatureAndHash.hash = hashId
- default:
- err = errors.New("unknown private key type")
- }
- if err != nil {
- c.sendAlert(alertInternalError)
- return errors.New("tls: failed to sign handshake with client certificate: " + err.Error())
- }
- certVerify.signature = signed
-
- hs.finishedHash.Write(certVerify.marshal())
- c.writeRecord(recordTypeHandshake, certVerify.marshal())
- }
-
- hs.masterSecret = masterFromPreMasterSecret(c.vers, preMasterSecret, hs.hello.random, hs.serverHello.random)
- return nil
-}
-
-func (hs *clientHandshakeState) establishKeys() error {
- c := hs.c
-
- clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV :=
- keysFromMasterSecret(c.vers, hs.masterSecret, hs.hello.random, hs.serverHello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
- var clientCipher, serverCipher interface{}
- var clientHash, serverHash macFunction
- if hs.suite.cipher != nil {
- clientCipher = hs.suite.cipher(clientKey, clientIV, false /* not for reading */)
- clientHash = hs.suite.mac(c.vers, clientMAC)
- serverCipher = hs.suite.cipher(serverKey, serverIV, true /* for reading */)
- serverHash = hs.suite.mac(c.vers, serverMAC)
- } else {
- clientCipher = hs.suite.aead(clientKey, clientIV)
- serverCipher = hs.suite.aead(serverKey, serverIV)
- }
-
- c.in.prepareCipherSpec(c.vers, serverCipher, serverHash)
- c.out.prepareCipherSpec(c.vers, clientCipher, clientHash)
- return nil
-}
-
-func (hs *clientHandshakeState) serverResumedSession() bool {
- // If the server responded with the same sessionId then it means the
- // sessionTicket is being used to resume a TLS session.
- return hs.session != nil && hs.hello.sessionId != nil &&
- bytes.Equal(hs.serverHello.sessionId, hs.hello.sessionId)
-}
-
-func (hs *clientHandshakeState) processServerHello() (bool, error) {
- c := hs.c
-
- if hs.serverHello.compressionMethod != compressionNone {
- c.sendAlert(alertUnexpectedMessage)
- return false, errors.New("tls: server selected unsupported compression format")
- }
-
- if !hs.hello.nextProtoNeg && hs.serverHello.nextProtoNeg {
- c.sendAlert(alertHandshakeFailure)
- return false, errors.New("server advertised unrequested NPN extension")
- }
-
- if hs.serverResumedSession() {
- // Restore masterSecret and peerCerts from previous state
- hs.masterSecret = hs.session.masterSecret
- c.peerCertificates = hs.session.serverCertificates
- return true, nil
- }
- return false, nil
-}
-
-func (hs *clientHandshakeState) readFinished() error {
- c := hs.c
-
- c.readRecord(recordTypeChangeCipherSpec)
- if err := c.in.error(); err != nil {
- return err
- }
-
- msg, err := c.readHandshake()
- if err != nil {
- return err
- }
- serverFinished, ok := msg.(*finishedMsg)
- if !ok {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(serverFinished, msg)
- }
-
- verify := hs.finishedHash.serverSum(hs.masterSecret)
- if len(verify) != len(serverFinished.verifyData) ||
- subtle.ConstantTimeCompare(verify, serverFinished.verifyData) != 1 {
- c.sendAlert(alertHandshakeFailure)
- return errors.New("tls: server's Finished message was incorrect")
- }
- hs.finishedHash.Write(serverFinished.marshal())
- return nil
-}
-
-func (hs *clientHandshakeState) readSessionTicket() error {
- if !hs.serverHello.ticketSupported {
- return nil
- }
-
- c := hs.c
- msg, err := c.readHandshake()
- if err != nil {
- return err
- }
- sessionTicketMsg, ok := msg.(*newSessionTicketMsg)
- if !ok {
- c.sendAlert(alertUnexpectedMessage)
- return unexpectedMessageError(sessionTicketMsg, msg)
- }
- hs.finishedHash.Write(sessionTicketMsg.marshal())
-
- hs.session = &ClientSessionState{
- sessionTicket: sessionTicketMsg.ticket,
- vers: c.vers,
- cipherSuite: hs.suite.id,
- masterSecret: hs.masterSecret,
- serverCertificates: c.peerCertificates,
- }
-
- return nil
-}
-
-func (hs *clientHandshakeState) sendFinished() error {
- c := hs.c
-
- c.writeRecord(recordTypeChangeCipherSpec, []byte{1})
- if hs.serverHello.nextProtoNeg {
- nextProto := new(nextProtoMsg)
- proto, fallback := mutualProtocol(c.config.NextProtos, hs.serverHello.nextProtos)
- nextProto.proto = proto
- c.clientProtocol = proto
- c.clientProtocolFallback = fallback
-
- hs.finishedHash.Write(nextProto.marshal())
- c.writeRecord(recordTypeHandshake, nextProto.marshal())
- }
-
- finished := new(finishedMsg)
- finished.verifyData = hs.finishedHash.clientSum(hs.masterSecret)
- hs.finishedHash.Write(finished.marshal())
- c.writeRecord(recordTypeHandshake, finished.marshal())
- return nil
-}
-
-// clientSessionCacheKey returns a key used to cache sessionTickets that could
-// be used to resume previously negotiated TLS sessions with a server.
-func clientSessionCacheKey(serverAddr net.Addr, config *Config) string {
- if len(config.ServerName) > 0 {
- return config.ServerName
- }
- return serverAddr.String()
-}
-
-// mutualProtocol finds the mutual Next Protocol Negotiation protocol given the
-// set of client and server supported protocols. The set of client supported
-// protocols must not be empty. It returns the resulting protocol and flag
-// indicating if the fallback case was reached.
-func mutualProtocol(clientProtos, serverProtos []string) (string, bool) {
- for _, s := range serverProtos {
- for _, c := range clientProtos {
- if s == c {
- return s, false
- }
- }
- }
-
- return clientProtos[0], true
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-01 01:35:24 +0000