Reland 'Require ECDHE for False Start.'

third_party/tlslite/patches/ecdhe_rsa.patch

Index: third_party/tlslite/patches/ecdhe_rsa.patch
diff --git a/third_party/tlslite/patches/ecdhe_rsa.patch b/third_party/tlslite/patches/ecdhe_rsa.patch
new file mode 100644
index 0000000000000000000000000000000000000000..054a07a0f0553a71849728eb034799e8cc53a3c7
--- /dev/null
+++ b/third_party/tlslite/patches/ecdhe_rsa.patch
@@ -0,0 +1,428 @@
+diff --git a/third_party/tlslite/tlslite/constants.py b/third_party/tlslite/tlslite/constants.py
+index e5b88af..6d78a20 100644
+--- a/third_party/tlslite/tlslite/constants.py
++++ b/third_party/tlslite/tlslite/constants.py
+@@ -76,6 +76,14 @@ class SignatureAlgorithm:
+ class NameType:
+     host_name = 0
+ 
++class ECCurveType:
++    explicit_prime = 1
++    explicit_char2 = 2
++    named_curve = 3
++
++class NamedCurve:
++    secp256r1 = 23
++
+ class AlertLevel:
+     warning = 1
+     fatal = 2
+@@ -178,11 +186,19 @@ class CipherSuite:
+     TLS_RSA_WITH_AES_128_GCM_SHA256 = 0x009C
+     TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 = 0x009E
+ 
++    TLS_ECDHE_RSA_WITH_RC4_128_SHA = 0xc011
++    TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA = 0xc012
++    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA = 0xc013
++    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA = 0xc014
++    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 = 0xc027
++    TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 = 0xc02f
++
+     tripleDESSuites = []
+     tripleDESSuites.append(TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA)
+     tripleDESSuites.append(TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA)
+     tripleDESSuites.append(TLS_RSA_WITH_3DES_EDE_CBC_SHA)
+     tripleDESSuites.append(TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA)
++    tripleDESSuites.append(TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA)
+ 
+     aes128Suites = []
+     aes128Suites.append(TLS_SRP_SHA_WITH_AES_128_CBC_SHA)
+@@ -192,6 +208,8 @@ class CipherSuite:
+     aes128Suites.append(TLS_DH_ANON_WITH_AES_128_CBC_SHA)
+     aes128Suites.append(TLS_RSA_WITH_AES_128_CBC_SHA256)
+     aes128Suites.append(TLS_DHE_RSA_WITH_AES_128_CBC_SHA256)
++    aes128Suites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA)
++    aes128Suites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256)
+ 
+     aes256Suites = []
+     aes256Suites.append(TLS_SRP_SHA_WITH_AES_256_CBC_SHA)
+@@ -201,14 +219,17 @@ class CipherSuite:
+     aes256Suites.append(TLS_DHE_RSA_WITH_AES_256_CBC_SHA)
+     aes256Suites.append(TLS_RSA_WITH_AES_256_CBC_SHA256)
+     aes256Suites.append(TLS_DHE_RSA_WITH_AES_256_CBC_SHA256)
++    aes256Suites.append(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA)
+ 
+     aes128GcmSuites = []
+     aes128GcmSuites.append(TLS_RSA_WITH_AES_128_GCM_SHA256)
+     aes128GcmSuites.append(TLS_DHE_RSA_WITH_AES_128_GCM_SHA256)
++    aes128GcmSuites.append(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)
+ 
+     rc4Suites = []
+     rc4Suites.append(TLS_RSA_WITH_RC4_128_SHA)
+     rc4Suites.append(TLS_RSA_WITH_RC4_128_MD5)
++    rc4Suites.append(TLS_ECDHE_RSA_WITH_RC4_128_SHA)
+     
+     shaSuites = []
+     shaSuites.append(TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA)
+@@ -226,6 +247,10 @@ class CipherSuite:
+     shaSuites.append(TLS_DHE_RSA_WITH_AES_256_CBC_SHA)
+     shaSuites.append(TLS_DH_ANON_WITH_AES_128_CBC_SHA)
+     shaSuites.append(TLS_DH_ANON_WITH_AES_256_CBC_SHA)
++    shaSuites.append(TLS_ECDHE_RSA_WITH_RC4_128_SHA)
++    shaSuites.append(TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA)
++    shaSuites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA)
++    shaSuites.append(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA)
+     
+     sha256Suites = []
+     sha256Suites.append(TLS_RSA_WITH_AES_128_CBC_SHA256)
+@@ -234,6 +259,9 @@ class CipherSuite:
+     sha256Suites.append(TLS_DHE_RSA_WITH_AES_256_CBC_SHA256)
+     sha256Suites.append(TLS_RSA_WITH_AES_128_GCM_SHA256)
+     sha256Suites.append(TLS_DHE_RSA_WITH_AES_128_GCM_SHA256)
++    sha256Suites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256)
++    sha256Suites.append(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)
++
+ 
+     aeadSuites = aes128GcmSuites
+ 
+@@ -275,6 +303,8 @@ class CipherSuite:
+             keyExchangeSuites += CipherSuite.certSuites
+         if "dhe_rsa" in keyExchangeNames:
+             keyExchangeSuites += CipherSuite.dheCertSuites
++        if "ecdhe_rsa" in keyExchangeNames:
++            keyExchangeSuites += CipherSuite.ecdheCertSuites
+         if "srp_sha" in keyExchangeNames:
+             keyExchangeSuites += CipherSuite.srpSuites
+         if "srp_sha_rsa" in keyExchangeNames:
+@@ -335,7 +365,19 @@ class CipherSuite:
+     def getDheCertSuites(settings, version=None):
+         return CipherSuite._filterSuites(CipherSuite.dheCertSuites, settings, version)
+ 
+-    certAllSuites = srpCertSuites + certSuites + dheCertSuites
++    ecdheCertSuites = []
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256)
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA)
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA)
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA)
++    ecdheCertSuites.append(TLS_ECDHE_RSA_WITH_RC4_128_SHA)
++
++    @staticmethod
++    def getEcdheCertSuites(settings, version=None):
++        return CipherSuite._filterSuites(CipherSuite.ecdheCertSuites, settings, version)
++
++    certAllSuites = srpCertSuites + certSuites + dheCertSuites + ecdheCertSuites
+ 
+     anonSuites = []
+     anonSuites.append(TLS_DH_ANON_WITH_AES_256_CBC_SHA)
+@@ -346,6 +388,7 @@ class CipherSuite:
+         return CipherSuite._filterSuites(CipherSuite.anonSuites, settings, version)
+ 
+     dhAllSuites = dheCertSuites + anonSuites
++    ecdhAllSuites = ecdheCertSuites
+ 
+     @staticmethod
+     def canonicalCipherName(ciphersuite):
+diff --git a/third_party/tlslite/tlslite/handshakesettings.py b/third_party/tlslite/tlslite/handshakesettings.py
+index e752834..605ed42 100644
+--- a/third_party/tlslite/tlslite/handshakesettings.py
++++ b/third_party/tlslite/tlslite/handshakesettings.py
+@@ -14,7 +14,7 @@ from .utils import cipherfactory
+ CIPHER_NAMES = ["aes128gcm", "rc4", "aes256", "aes128", "3des"]
+ MAC_NAMES = ["sha", "sha256", "aead"] # Don't allow "md5" by default.
+ ALL_MAC_NAMES = MAC_NAMES + ["md5"]
+-KEY_EXCHANGE_NAMES = ["rsa", "dhe_rsa", "srp_sha", "srp_sha_rsa", "dh_anon"]
++KEY_EXCHANGE_NAMES = ["rsa", "dhe_rsa", "ecdhe_rsa", "srp_sha", "srp_sha_rsa", "dh_anon"]
+ CIPHER_IMPLEMENTATIONS = ["openssl", "pycrypto", "python"]
+ CERTIFICATE_TYPES = ["x509"]
+ TLS_INTOLERANCE_TYPES = ["alert", "close", "reset"]
+diff --git a/third_party/tlslite/tlslite/messages.py b/third_party/tlslite/tlslite/messages.py
+index f2e2cfc..9aeff6d 100644
+--- a/third_party/tlslite/tlslite/messages.py
++++ b/third_party/tlslite/tlslite/messages.py
+@@ -509,10 +509,13 @@ class ServerKeyExchange(HandshakeMsg):
+         self.srp_g = 0
+         self.srp_s = bytearray(0)
+         self.srp_B = 0
+-        # Anon DH params:
++        # DH params:
+         self.dh_p = 0
+         self.dh_g = 0
+         self.dh_Ys = 0
++        # ECDH params:
++        self.ecdhCurve = 0
++        self.ecdhPublic = bytearray(0)
+         self.signature = bytearray(0)
+ 
+     def createSRP(self, srp_N, srp_g, srp_s, srp_B):
+@@ -528,6 +531,11 @@ class ServerKeyExchange(HandshakeMsg):
+         self.dh_Ys = dh_Ys
+         return self
+ 
++    def createECDH(self, ecdhCurve, ecdhPublic):
++        self.ecdhCurve = ecdhCurve
++        self.ecdhPublic = ecdhPublic
++        return self
++
+     def parse(self, p):
+         p.startLengthCheck(3)
+         if self.cipherSuite in CipherSuite.srpAllSuites:
+@@ -555,6 +563,10 @@ class ServerKeyExchange(HandshakeMsg):
+             w.addVarSeq(numberToByteArray(self.dh_p), 1, 2)
+             w.addVarSeq(numberToByteArray(self.dh_g), 1, 2)
+             w.addVarSeq(numberToByteArray(self.dh_Ys), 1, 2)
++        elif self.cipherSuite in CipherSuite.ecdhAllSuites:
++            w.add(ECCurveType.named_curve, 1)
++            w.add(self.ecdhCurve, 2)
++            w.addVarSeq(self.ecdhPublic, 1, 1)
+         else:
+             assert(False)
+         return w.bytes
+@@ -626,7 +638,9 @@ class ClientKeyExchange(HandshakeMsg):
+             else:
+                 raise AssertionError()
+         elif self.cipherSuite in CipherSuite.dhAllSuites:
+-            self.dh_Yc = bytesToNumber(p.getVarBytes(2))            
++            self.dh_Yc = bytesToNumber(p.getVarBytes(2))
++        elif self.cipherSuite in CipherSuite.ecdhAllSuites:
++            self.ecdh_Yc = p.getVarBytes(1)
+         else:
+             raise AssertionError()
+         p.stopLengthCheck()
+diff --git a/third_party/tlslite/tlslite/tlsconnection.py b/third_party/tlslite/tlslite/tlsconnection.py
+index 0a85d3c..dfac274 100644
+--- a/third_party/tlslite/tlslite/tlsconnection.py
++++ b/third_party/tlslite/tlslite/tlsconnection.py
+@@ -24,6 +24,7 @@ from .mathtls import *
+ from .handshakesettings import HandshakeSettings
+ from .utils.tackwrapper import *
+ from .utils.rsakey import RSAKey
++from .utils import p256
+ 
+ class KeyExchange(object):
+     def __init__(self, cipherSuite, clientHello, serverHello, privateKey):
+@@ -127,6 +128,25 @@ DE2BCBF6 95581718 3995497C EA956AE5 15D22618 98FA0510
+         S = powMod(dh_Yc, self.dh_Xs, self.dh_p)
+         return numberToByteArray(S)
+ 
++class ECDHE_RSAKeyExchange(KeyExchange):
++    def makeServerKeyExchange(self):
++        public, self.private = p256.generatePublicPrivate()
++
++        version = self.serverHello.server_version
++        serverKeyExchange = ServerKeyExchange(self.cipherSuite, version)
++        serverKeyExchange.createECDH(NamedCurve.secp256r1, bytearray(public))
++        hashBytes = serverKeyExchange.hash(self.clientHello.random,
++                                           self.serverHello.random)
++        if version >= (3,3):
++            # TODO: Signature algorithm negotiation not supported.
++            hashBytes = RSAKey.addPKCS1SHA1Prefix(hashBytes)
++        serverKeyExchange.signature = self.privateKey.sign(hashBytes)
++        return serverKeyExchange
++
++    def processClientKeyExchange(self, clientKeyExchange):
++        ecdh_Yc = clientKeyExchange.ecdh_Yc
++        return bytearray(p256.generateSharedValue(bytes(ecdh_Yc), self.private))
++
+ class TLSConnection(TLSRecordLayer):
+     """
+     This class wraps a socket and provides TLS handshaking and data
+@@ -1321,9 +1341,8 @@ class TLSConnection(TLSRecordLayer):
+                 else: break
+             premasterSecret = result
+ 
+-        # Perform the RSA or DHE_RSA key exchange
+-        elif (cipherSuite in CipherSuite.certSuites or
+-              cipherSuite in CipherSuite.dheCertSuites):
++        # Perform a certificate-based key exchange
++        elif cipherSuite in CipherSuite.certAllSuites:
+             if cipherSuite in CipherSuite.certSuites:
+                 keyExchange = RSAKeyExchange(cipherSuite,
+                                              clientHello,
+@@ -1334,6 +1353,11 @@ class TLSConnection(TLSRecordLayer):
+                                                  clientHello,
+                                                  serverHello,
+                                                  privateKey)
++            elif cipherSuite in CipherSuite.ecdheCertSuites:
++                keyExchange = ECDHE_RSAKeyExchange(cipherSuite,
++                                                   clientHello,
++                                                   serverHello,
++                                                   privateKey)
+             else:
+                 assert(False)
+             for result in self._serverCertKeyExchange(clientHello, serverHello, 
+@@ -1450,6 +1474,7 @@ class TLSConnection(TLSRecordLayer):
+                     CipherSuite.getSrpCertSuites(settings, self.version)
+             cipherSuites += CipherSuite.getSrpSuites(settings, self.version)
+         elif certChain:
++            cipherSuites += CipherSuite.getEcdheCertSuites(settings, self.version)
+             cipherSuites += CipherSuite.getDheCertSuites(settings, self.version)
+             cipherSuites += CipherSuite.getCertSuites(settings, self.version)
+         elif anon:
+diff --git a/third_party/tlslite/tlslite/utils/p256.py b/third_party/tlslite/tlslite/utils/p256.py
+index e69de29..6eb9a77 100644
+--- a/third_party/tlslite/tlslite/utils/p256.py
++++ b/third_party/tlslite/tlslite/utils/p256.py
+@@ -0,0 +1,162 @@
++# Author: Google
++# See the LICENSE file for legal information regarding use of this file.
++
++import os
++
++p = (
++    115792089210356248762697446949407573530086143415290314195533631308867097853951)
++order = (
++    115792089210356248762697446949407573529996955224135760342422259061068512044369)
++p256B = 0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b
++
++baseX = 0x6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296
++baseY = 0x4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5
++basePoint = (baseX, baseY)
++
++
++def _pointAdd(a, b):
++    Z1Z1 = (a[2] * a[2]) % p
++    Z2Z2 = (b[2] * b[2]) % p
++    U1 = (a[0] * Z2Z2) % p
++    U2 = (b[0] * Z1Z1) % p
++    S1 = (a[1] * b[2] * Z2Z2) % p
++    S2 = (b[1] * a[2] * Z1Z1) % p
++    if U1 == U2 and S1 == S2:
++        return pointDouble(a)
++    H = (U2 - U1) % p
++    I = (4 * H * H) % p
++    J = (H * I) % p
++    r = (2 * (S2 - S1)) % p
++    V = (U1 * I) % p
++    X3 = (r * r - J - 2 * V) % p
++    Y3 = (r * (V - X3) - 2 * S1 * J) % p
++    Z3 = (((a[2] + b[2]) * (a[2] + b[2]) - Z1Z1 - Z2Z2) * H) % p
++
++    return (X3, Y3, Z3)
++
++
++def _pointDouble(a):
++    delta = (a[2] * a[2]) % p
++    gamma = (a[1] * a[1]) % p
++    beta = (a[0] * gamma) % p
++    alpha = (3 * (a[0] - delta) * (a[0] + delta)) % p
++    X3 = (alpha * alpha - 8 * beta) % p
++    Z3 = ((a[1] + a[2]) * (a[1] + a[2]) - gamma - delta) % p
++    Y3 = (alpha * (4 * beta - X3) - 8 * gamma * gamma) % p
++
++    return (X3, Y3, Z3)
++
++
++def _square(n):
++    return (n * n)
++
++
++def _modpow(a, n, p):
++    if n == 0:
++        return 1
++    if n == 1:
++        return a
++    r = _square(_modpow(a, n >> 1, p)) % p
++    if n & 1 == 1:
++        r = (r * a) % p
++    return r
++
++
++def _scalarMult(k, point):
++    accum = (0, 0, 0)
++    accumIsInfinity = True
++    jacobianPoint = (point[0], point[1], 1)
++
++    for bit in range(255, -1, -1):
++        if not accumIsInfinity:
++            accum = _pointDouble(accum)
++
++        if (k >> bit) & 1 == 1:
++            if accumIsInfinity:
++                accum = jacobianPoint
++                accumIsInfinity = False
++            else:
++                accum = _pointAdd(accum, jacobianPoint)
++
++    if accumIsInfinity:
++        return (0, 0)
++
++    zInv = _modpow(accum[2], p - 2, p)
++    return ((accum[0] * zInv * zInv) % p, (accum[1] * zInv * zInv * zInv) % p)
++
++
++def _scalarBaseMult(k):
++    return _scalarMult(k, basePoint)
++
++
++def _decodeBigEndian(b):
++    return sum([ord(b[len(b) - i - 1]) << 8 * i for i in range(len(b))])
++
++
++def _encodeBigEndian(n):
++    b = []
++    while n != 0:
++        b.append(chr(n & 0xff))
++        n >>= 8
++
++    if len(b) == 0:
++        b.append(0)
++    b.reverse()
++
++    return "".join(b)
++
++
++def _zeroPad(b, length):
++    if len(b) < length:
++        return ("\x00" * (length - len(b))) + b
++    return b
++
++
++def _encodePoint(point):
++    x = point[0]
++    y = point[1]
++    if (y * y) % p != (x * x * x - 3 * x + p256B) % p:
++        raise "point not on curve"
++    return "\x04" + _zeroPad(_encodeBigEndian(point[0]), 32) + _zeroPad(
++        _encodeBigEndian(point[1]), 32)
++
++
++def _decodePoint(b):
++    if len(b) != 1 + 32 + 32 or ord(b[0]) != 4:
++        raise "invalid encoded ec point"
++    x = _decodeBigEndian(b[1:33])
++    y = _decodeBigEndian(b[33:65])
++    if (y * y) % p != (x * x * x - 3 * x + p256B) % p:
++        raise "point not on curve"
++    return (x, y)
++
++
++def generatePublicPrivate():
++    """generatePublicPrivate returns a tuple of (X9.62 encoded public point,
++    private value), where the private value is generated from os.urandom."""
++    private = _decodeBigEndian(os.urandom(40)) % order
++    return _encodePoint(_scalarBaseMult(private)), private
++
++
++def generateSharedValue(theirPublic, private):
++    """generateSharedValue returns the encoded x-coordinate of the
++    multiplication of a peer's X9.62 encoded point and a private value."""
++    return _zeroPad(
++        _encodeBigEndian(_scalarMult(private, _decodePoint(theirPublic))[0]),
++        32)
++
++if __name__ == "__main__":
++    alice, alicePrivate = generatePublicPrivate()
++    bob, bobPrivate = generatePublicPrivate()
++
++    if generateSharedValue(alice, bobPrivate) != generateSharedValue(
++        bob, alicePrivate):
++        raise "simple DH test failed"
++
++    (x, _) = _scalarBaseMult(1)
++
++    for i in range(1000):
++        (x, _) = _scalarBaseMult(x)
++
++    if x != 2428281965257598569040586318034812501729437946720808289049534492833635302706:
++        raise "loop test failed"