diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/crypto/tls/handshake_server.go')
| -rw-r--r-- | gcc-4.8.1/libgo/go/crypto/tls/handshake_server.go | 604 |
1 files changed, 0 insertions, 604 deletions
diff --git a/gcc-4.8.1/libgo/go/crypto/tls/handshake_server.go b/gcc-4.8.1/libgo/go/crypto/tls/handshake_server.go deleted file mode 100644 index 730991016..000000000 --- a/gcc-4.8.1/libgo/go/crypto/tls/handshake_server.go +++ /dev/null @@ -1,604 +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 ( - "crypto" - "crypto/rsa" - "crypto/subtle" - "crypto/x509" - "errors" - "io" -) - -// serverHandshakeState contains details of a server handshake in progress. -// It's discarded once the handshake has completed. -type serverHandshakeState struct { - c *Conn - clientHello *clientHelloMsg - hello *serverHelloMsg - suite *cipherSuite - ellipticOk bool - sessionState *sessionState - finishedHash finishedHash - masterSecret []byte - certsFromClient [][]byte -} - -// serverHandshake performs a TLS handshake as a server. -func (c *Conn) serverHandshake() error { - config := c.config - - // If this is the first server handshake, we generate a random key to - // encrypt the tickets with. - config.serverInitOnce.Do(func() { - if config.SessionTicketsDisabled { - return - } - - // If the key has already been set then we have nothing to do. - for _, b := range config.SessionTicketKey { - if b != 0 { - return - } - } - - if _, err := io.ReadFull(config.rand(), config.SessionTicketKey[:]); err != nil { - config.SessionTicketsDisabled = true - } - }) - - hs := serverHandshakeState{ - c: c, - } - isResume, err := hs.readClientHello() - if err != nil { - return err - } - - // For an overview of TLS handshaking, see https://tools.ietf.org/html/rfc5246#section-7.3 - if isResume { - // The client has included a session ticket and so we do an abbreviated handshake. - if err := hs.doResumeHandshake(); err != nil { - return err - } - if err := hs.establishKeys(); err != nil { - return err - } - if err := hs.sendFinished(); err != nil { - return err - } - if err := hs.readFinished(); err != nil { - return err - } - c.didResume = true - } else { - // The client didn't include a session ticket, or it wasn't - // valid so we do a full handshake. - if err := hs.doFullHandshake(); err != nil { - return err - } - if err := hs.establishKeys(); err != nil { - return err - } - if err := hs.readFinished(); err != nil { - return err - } - if err := hs.sendSessionTicket(); err != nil { - return err - } - if err := hs.sendFinished(); err != nil { - return err - } - } - c.handshakeComplete = true - - return nil -} - -// readClientHello reads a ClientHello message from the client and decides -// whether we will perform session resumption. -func (hs *serverHandshakeState) readClientHello() (isResume bool, err error) { - config := hs.c.config - c := hs.c - - msg, err := c.readHandshake() - if err != nil { - return false, err - } - var ok bool - hs.clientHello, ok = msg.(*clientHelloMsg) - if !ok { - return false, c.sendAlert(alertUnexpectedMessage) - } - c.vers, ok = mutualVersion(hs.clientHello.vers) - if !ok { - return false, c.sendAlert(alertProtocolVersion) - } - c.haveVers = true - - hs.finishedHash = newFinishedHash(c.vers) - hs.finishedHash.Write(hs.clientHello.marshal()) - - hs.hello = new(serverHelloMsg) - - supportedCurve := false -Curves: - for _, curve := range hs.clientHello.supportedCurves { - switch curve { - case curveP256, curveP384, curveP521: - supportedCurve = true - break Curves - } - } - - supportedPointFormat := false - for _, pointFormat := range hs.clientHello.supportedPoints { - if pointFormat == pointFormatUncompressed { - supportedPointFormat = true - break - } - } - hs.ellipticOk = supportedCurve && supportedPointFormat - - foundCompression := false - // We only support null compression, so check that the client offered it. - for _, compression := range hs.clientHello.compressionMethods { - if compression == compressionNone { - foundCompression = true - break - } - } - - if !foundCompression { - return false, c.sendAlert(alertHandshakeFailure) - } - - hs.hello.vers = c.vers - t := uint32(config.time().Unix()) - hs.hello.random = make([]byte, 32) - hs.hello.random[0] = byte(t >> 24) - hs.hello.random[1] = byte(t >> 16) - hs.hello.random[2] = byte(t >> 8) - hs.hello.random[3] = byte(t) - _, err = io.ReadFull(config.rand(), hs.hello.random[4:]) - if err != nil { - return false, c.sendAlert(alertInternalError) - } - hs.hello.compressionMethod = compressionNone - if len(hs.clientHello.serverName) > 0 { - c.serverName = hs.clientHello.serverName - } - if hs.clientHello.nextProtoNeg { - hs.hello.nextProtoNeg = true - hs.hello.nextProtos = config.NextProtos - } - - if hs.checkForResumption() { - return true, nil - } - - var preferenceList, supportedList []uint16 - if c.config.PreferServerCipherSuites { - preferenceList = c.config.cipherSuites() - supportedList = hs.clientHello.cipherSuites - } else { - preferenceList = hs.clientHello.cipherSuites - supportedList = c.config.cipherSuites() - } - - for _, id := range preferenceList { - if hs.suite = c.tryCipherSuite(id, supportedList, hs.ellipticOk); hs.suite != nil { - break - } - } - - if hs.suite == nil { - return false, c.sendAlert(alertHandshakeFailure) - } - - return false, nil -} - -// checkForResumption returns true if we should perform resumption on this connection. -func (hs *serverHandshakeState) checkForResumption() bool { - c := hs.c - - var ok bool - if hs.sessionState, ok = c.decryptTicket(hs.clientHello.sessionTicket); !ok { - return false - } - - if hs.sessionState.vers > hs.clientHello.vers { - return false - } - if vers, ok := mutualVersion(hs.sessionState.vers); !ok || vers != hs.sessionState.vers { - return false - } - - cipherSuiteOk := false - // Check that the client is still offering the ciphersuite in the session. - for _, id := range hs.clientHello.cipherSuites { - if id == hs.sessionState.cipherSuite { - cipherSuiteOk = true - break - } - } - if !cipherSuiteOk { - return false - } - - // Check that we also support the ciphersuite from the session. - hs.suite = c.tryCipherSuite(hs.sessionState.cipherSuite, c.config.cipherSuites(), hs.ellipticOk) - if hs.suite == nil { - return false - } - - sessionHasClientCerts := len(hs.sessionState.certificates) != 0 - needClientCerts := c.config.ClientAuth == RequireAnyClientCert || c.config.ClientAuth == RequireAndVerifyClientCert - if needClientCerts && !sessionHasClientCerts { - return false - } - if sessionHasClientCerts && c.config.ClientAuth == NoClientCert { - return false - } - - return true -} - -func (hs *serverHandshakeState) doResumeHandshake() error { - c := hs.c - - hs.hello.cipherSuite = hs.suite.id - // We echo the client's session ID in the ServerHello to let it know - // that we're doing a resumption. - hs.hello.sessionId = hs.clientHello.sessionId - hs.finishedHash.Write(hs.hello.marshal()) - c.writeRecord(recordTypeHandshake, hs.hello.marshal()) - - if len(hs.sessionState.certificates) > 0 { - if _, err := hs.processCertsFromClient(hs.sessionState.certificates); err != nil { - return err - } - } - - hs.masterSecret = hs.sessionState.masterSecret - - return nil -} - -func (hs *serverHandshakeState) doFullHandshake() error { - config := hs.c.config - c := hs.c - - if len(config.Certificates) == 0 { - return c.sendAlert(alertInternalError) - } - cert := &config.Certificates[0] - if len(hs.clientHello.serverName) > 0 { - cert = config.getCertificateForName(hs.clientHello.serverName) - } - - if hs.clientHello.ocspStapling && len(cert.OCSPStaple) > 0 { - hs.hello.ocspStapling = true - } - - hs.hello.ticketSupported = hs.clientHello.ticketSupported && !config.SessionTicketsDisabled - hs.hello.cipherSuite = hs.suite.id - hs.finishedHash.Write(hs.hello.marshal()) - c.writeRecord(recordTypeHandshake, hs.hello.marshal()) - - certMsg := new(certificateMsg) - certMsg.certificates = cert.Certificate - hs.finishedHash.Write(certMsg.marshal()) - c.writeRecord(recordTypeHandshake, certMsg.marshal()) - - if hs.hello.ocspStapling { - certStatus := new(certificateStatusMsg) - certStatus.statusType = statusTypeOCSP - certStatus.response = cert.OCSPStaple - hs.finishedHash.Write(certStatus.marshal()) - c.writeRecord(recordTypeHandshake, certStatus.marshal()) - } - - keyAgreement := hs.suite.ka() - skx, err := keyAgreement.generateServerKeyExchange(config, cert, hs.clientHello, hs.hello) - if err != nil { - c.sendAlert(alertHandshakeFailure) - return err - } - if skx != nil { - hs.finishedHash.Write(skx.marshal()) - c.writeRecord(recordTypeHandshake, skx.marshal()) - } - - if config.ClientAuth >= RequestClientCert { - // Request a client certificate - certReq := new(certificateRequestMsg) - certReq.certificateTypes = []byte{certTypeRSASign} - - // An empty list of certificateAuthorities signals to - // the client that it may send any certificate in response - // to our request. When we know the CAs we trust, then - // we can send them down, so that the client can choose - // an appropriate certificate to give to us. - if config.ClientCAs != nil { - certReq.certificateAuthorities = config.ClientCAs.Subjects() - } - hs.finishedHash.Write(certReq.marshal()) - c.writeRecord(recordTypeHandshake, certReq.marshal()) - } - - helloDone := new(serverHelloDoneMsg) - hs.finishedHash.Write(helloDone.marshal()) - c.writeRecord(recordTypeHandshake, helloDone.marshal()) - - var pub *rsa.PublicKey // public key for client auth, if any - - msg, err := c.readHandshake() - if err != nil { - return err - } - - var ok bool - // If we requested a client certificate, then the client must send a - // certificate message, even if it's empty. - if config.ClientAuth >= RequestClientCert { - if certMsg, ok = msg.(*certificateMsg); !ok { - return c.sendAlert(alertHandshakeFailure) - } - hs.finishedHash.Write(certMsg.marshal()) - - if len(certMsg.certificates) == 0 { - // The client didn't actually send a certificate - switch config.ClientAuth { - case RequireAnyClientCert, RequireAndVerifyClientCert: - c.sendAlert(alertBadCertificate) - return errors.New("tls: client didn't provide a certificate") - } - } - - pub, err = hs.processCertsFromClient(certMsg.certificates) - if err != nil { - return err - } - - msg, err = c.readHandshake() - if err != nil { - return err - } - } - - // Get client key exchange - ckx, ok := msg.(*clientKeyExchangeMsg) - if !ok { - return c.sendAlert(alertUnexpectedMessage) - } - hs.finishedHash.Write(ckx.marshal()) - - // If we received a client cert in response to our certificate request message, - // the client will send us a certificateVerifyMsg immediately after the - // clientKeyExchangeMsg. This message is a MD5SHA1 digest of all preceding - // handshake-layer messages that is signed using the private key corresponding - // to the client's certificate. This allows us to verify that the client is in - // possession of the private key of the certificate. - if len(c.peerCertificates) > 0 { - msg, err = c.readHandshake() - if err != nil { - return err - } - certVerify, ok := msg.(*certificateVerifyMsg) - if !ok { - return c.sendAlert(alertUnexpectedMessage) - } - - digest := make([]byte, 0, 36) - digest = hs.finishedHash.serverMD5.Sum(digest) - digest = hs.finishedHash.serverSHA1.Sum(digest) - err = rsa.VerifyPKCS1v15(pub, crypto.MD5SHA1, digest, certVerify.signature) - if err != nil { - c.sendAlert(alertBadCertificate) - return errors.New("could not validate signature of connection nonces: " + err.Error()) - } - - hs.finishedHash.Write(certVerify.marshal()) - } - - preMasterSecret, err := keyAgreement.processClientKeyExchange(config, cert, ckx, c.vers) - if err != nil { - c.sendAlert(alertHandshakeFailure) - return err - } - hs.masterSecret = masterFromPreMasterSecret(c.vers, preMasterSecret, hs.clientHello.random, hs.hello.random) - - return nil -} - -func (hs *serverHandshakeState) establishKeys() error { - c := hs.c - - clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV := - keysFromMasterSecret(c.vers, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen) - - clientCipher := hs.suite.cipher(clientKey, clientIV, true /* for reading */) - clientHash := hs.suite.mac(c.vers, clientMAC) - c.in.prepareCipherSpec(c.vers, clientCipher, clientHash) - - serverCipher := hs.suite.cipher(serverKey, serverIV, false /* not for reading */) - serverHash := hs.suite.mac(c.vers, serverMAC) - c.out.prepareCipherSpec(c.vers, serverCipher, serverHash) - - return nil -} - -func (hs *serverHandshakeState) readFinished() error { - c := hs.c - - c.readRecord(recordTypeChangeCipherSpec) - if err := c.error(); err != nil { - return err - } - - if hs.hello.nextProtoNeg { - msg, err := c.readHandshake() - if err != nil { - return err - } - nextProto, ok := msg.(*nextProtoMsg) - if !ok { - return c.sendAlert(alertUnexpectedMessage) - } - hs.finishedHash.Write(nextProto.marshal()) - c.clientProtocol = nextProto.proto - } - - msg, err := c.readHandshake() - if err != nil { - return err - } - clientFinished, ok := msg.(*finishedMsg) - if !ok { - return c.sendAlert(alertUnexpectedMessage) - } - - verify := hs.finishedHash.clientSum(hs.masterSecret) - if len(verify) != len(clientFinished.verifyData) || - subtle.ConstantTimeCompare(verify, clientFinished.verifyData) != 1 { - return c.sendAlert(alertHandshakeFailure) - } - - hs.finishedHash.Write(clientFinished.marshal()) - return nil -} - -func (hs *serverHandshakeState) sendSessionTicket() error { - if !hs.hello.ticketSupported { - return nil - } - - c := hs.c - m := new(newSessionTicketMsg) - - var err error - state := sessionState{ - vers: c.vers, - cipherSuite: hs.suite.id, - masterSecret: hs.masterSecret, - certificates: hs.certsFromClient, - } - m.ticket, err = c.encryptTicket(&state) - if err != nil { - return err - } - - hs.finishedHash.Write(m.marshal()) - c.writeRecord(recordTypeHandshake, m.marshal()) - - return nil -} - -func (hs *serverHandshakeState) sendFinished() error { - c := hs.c - - c.writeRecord(recordTypeChangeCipherSpec, []byte{1}) - - finished := new(finishedMsg) - finished.verifyData = hs.finishedHash.serverSum(hs.masterSecret) - hs.finishedHash.Write(finished.marshal()) - c.writeRecord(recordTypeHandshake, finished.marshal()) - - c.cipherSuite = hs.suite.id - - return nil -} - -// processCertsFromClient takes a chain of client certificates either from a -// Certificates message or from a sessionState and verifies them. It returns -// the public key of the leaf certificate. -func (hs *serverHandshakeState) processCertsFromClient(certificates [][]byte) (*rsa.PublicKey, error) { - c := hs.c - - hs.certsFromClient = certificates - certs := make([]*x509.Certificate, len(certificates)) - var err error - for i, asn1Data := range certificates { - if certs[i], err = x509.ParseCertificate(asn1Data); err != nil { - c.sendAlert(alertBadCertificate) - return nil, errors.New("tls: failed to parse client certificate: " + err.Error()) - } - } - - if c.config.ClientAuth >= VerifyClientCertIfGiven && len(certs) > 0 { - opts := x509.VerifyOptions{ - Roots: c.config.ClientCAs, - CurrentTime: c.config.time(), - Intermediates: x509.NewCertPool(), - KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}, - } - - for _, cert := range certs[1:] { - opts.Intermediates.AddCert(cert) - } - - chains, err := certs[0].Verify(opts) - if err != nil { - c.sendAlert(alertBadCertificate) - return nil, errors.New("tls: failed to verify client's certificate: " + err.Error()) - } - - ok := false - for _, ku := range certs[0].ExtKeyUsage { - if ku == x509.ExtKeyUsageClientAuth { - ok = true - break - } - } - if !ok { - c.sendAlert(alertHandshakeFailure) - return nil, errors.New("tls: client's certificate's extended key usage doesn't permit it to be used for client authentication") - } - - c.verifiedChains = chains - } - - if len(certs) > 0 { - pub, ok := certs[0].PublicKey.(*rsa.PublicKey) - if !ok { - return nil, c.sendAlert(alertUnsupportedCertificate) - } - c.peerCertificates = certs - return pub, nil - } - - return nil, nil -} - -// tryCipherSuite returns a cipherSuite with the given id if that cipher suite -// is acceptable to use. -func (c *Conn) tryCipherSuite(id uint16, supportedCipherSuites []uint16, ellipticOk bool) *cipherSuite { - for _, supported := range supportedCipherSuites { - if id == supported { - var candidate *cipherSuite - - for _, s := range cipherSuites { - if s.id == id { - candidate = s - break - } - } - if candidate == nil { - continue - } - // Don't select a ciphersuite which we can't - // support for this client. - if candidate.elliptic && !ellipticOk { - continue - } - return candidate - } - } - - return nil -} |