Update tlslite to 0.4.6.

third_party/tlslite/patches/fallback_scsv.patch

-diff --git a/third_party/tlslite/tlslite/TLSConnection.py b/third_party/tlslite/tlslite/TLSConnection.py
-index d2270a9..e6ce187 100644
---- a/third_party/tlslite/tlslite/TLSConnection.py
-+++ b/third_party/tlslite/tlslite/TLSConnection.py
-@@ -937,7 +937,8 @@ class TLSConnection(TLSRecordLayer):
-                         certChain=None, privateKey=None, reqCert=False,
-                         sessionCache=None, settings=None, checker=None,
-                         reqCAs=None, tlsIntolerant=0,
--                        signedCertTimestamps=None):
-+                        signedCertTimestamps=None,
+diff --git a/third_party/tlslite/tlslite/constants.py b/third_party/tlslite/tlslite/constants.py
+index b3bad2d..d132b78 100755
+--- a/third_party/tlslite/tlslite/constants.py
++++ b/third_party/tlslite/tlslite/constants.py
+@@ -106,6 +106,7 @@ class AlertDescription:
+     protocol_version = 70
+     insufficient_security = 71
+     internal_error = 80
++    inappropriate_fallback = 86
+     user_canceled = 90
+     no_renegotiation = 100
+     unknown_psk_identity = 115
+@@ -117,6 +118,9 @@ class CipherSuite:
+     # We actually don't do any renegotiation, but this
+     # prevents renegotiation attacks
+     TLS_EMPTY_RENEGOTIATION_INFO_SCSV = 0x00FF
++
++    # draft-bmoeller-tls-downgrade-scsv-01
++    TLS_FALLBACK_SCSV = 0x5600
+     
+     TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA  = 0xC01A
+     TLS_SRP_SHA_WITH_AES_128_CBC_SHA = 0xC01D
+diff --git a/third_party/tlslite/tlslite/errors.py b/third_party/tlslite/tlslite/errors.py
+index 22c298c..001ef33 100755
+--- a/third_party/tlslite/tlslite/errors.py
++++ b/third_party/tlslite/tlslite/errors.py
+@@ -63,6 +63,7 @@ class TLSAlert(TLSError):
+         AlertDescription.protocol_version: "protocol_version",\
+         AlertDescription.insufficient_security: "insufficient_security",\
+         AlertDescription.internal_error: "internal_error",\
++        AlertDescription.inappropriate_fallback: "inappropriate_fallback",\
+         AlertDescription.user_canceled: "user_canceled",\
+         AlertDescription.no_renegotiation: "no_renegotiation",\
+         AlertDescription.unknown_psk_identity: "unknown_psk_identity"}
+diff --git a/third_party/tlslite/tlslite/tlsconnection.py b/third_party/tlslite/tlslite/tlsconnection.py
+index 45b0bbb..bd92161 100755
+--- a/third_party/tlslite/tlslite/tlsconnection.py
++++ b/third_party/tlslite/tlslite/tlsconnection.py
+@@ -966,7 +966,8 @@ class TLSConnection(TLSRecordLayer):
+                         reqCAs = None, 
+                         tacks=None, activationFlags=0,
+                         nextProtos=None, anon=False,
+-                        tlsIntolerant=None, signedCertTimestamps=None):
++                        tlsIntolerant=None, signedCertTimestamps=None,
 +                        fallbackSCSV=False):
          """Perform a handshake in the role of server.
  
          This function performs an SSL or TLS handshake.  Depending on
-@@ -1014,6 +1014,19 @@ class TLSConnection(TLSRecordLayer):
+@@ -1045,6 +1046,11 @@ class TLSConnection(TLSRecordLayer):
          binary 8-bit string) that will be sent as a TLS extension whenever
          the client announces support for the extension.
  
-+        @type tlsIntolerant: int
-+        @param tlsIntolerant: if non-zero, the server will simulate TLS
-+        version intolerance by returning a fatal, handshake_failure alert.
-+        The versions to which it's intolerant vary depending on the value:
-+        1: reject all TLS versions.
-+        2: reject TLS 1.1 or higher.
-+        3: reject TLS 1.2 or higher.
-+
 +        @type fallbackSCSV: bool
 +        @param fallbackSCSV: if true, the server will implement
 +        TLS_FALLBACK_SCSV and thus reject connections using less than the
 +        server's maximum TLS version that include this cipher suite.
 +
          @raise socket.error: If a socket error occurs.
          @raise tlslite.errors.TLSAbruptCloseError: If the socket is closed
          without a preceding alert.
-@@ -1022,7 +1023,8 @@ class TLSConnection(TLSRecordLayer):
-         """
-         for result in self.handshakeServerAsync(sharedKeyDB, verifierDB,
-                 certChain, privateKey, reqCert, sessionCache, settings,
--                checker, reqCAs, tlsIntolerant, signedCertTimestamps):
-+                checker, reqCAs, tlsIntolerant, signedCertTimestamps,
-+                fallbackSCSV):
+@@ -1057,7 +1063,8 @@ class TLSConnection(TLSRecordLayer):
+                 checker, reqCAs, 
+                 tacks=tacks, activationFlags=activationFlags, 
+                 nextProtos=nextProtos, anon=anon, tlsIntolerant=tlsIntolerant,
+-                signedCertTimestamps=signedCertTimestamps):
++                signedCertTimestamps=signedCertTimestamps,
++                fallbackSCSV=fallbackSCSV):
              pass
  
  
-@@ -1030,7 +1032,8 @@ class TLSConnection(TLSRecordLayer):
-                              certChain=None, privateKey=None, reqCert=False,
-                              sessionCache=None, settings=None, checker=None,
-                              reqCAs=None, tlsIntolerant=0,
--                             signedCertTimestamps=None):
+@@ -1068,7 +1075,8 @@ class TLSConnection(TLSRecordLayer):
+                              tacks=None, activationFlags=0,
+                              nextProtos=None, anon=False,
+                              tlsIntolerant=None,
+-                             signedCertTimestamps=None
 +                             signedCertTimestamps=None,
-+                             fallbackSCSV=False):
++                             fallbackSCSV=False
+                              ):
          """Start a server handshake operation on the TLS connection.
  
-         This function returns a generator which behaves similarly to
-@@ -1049,7 +1052,8 @@ class TLSConnection(TLSRecordLayer):
-             sessionCache=sessionCache, settings=settings,
-             reqCAs=reqCAs,
+@@ -1089,7 +1097,8 @@ class TLSConnection(TLSRecordLayer):
+             tacks=tacks, activationFlags=activationFlags, 
+             nextProtos=nextProtos, anon=anon,
              tlsIntolerant=tlsIntolerant,
 -            signedCertTimestamps=signedCertTimestamps)
 +            signedCertTimestamps=signedCertTimestamps,
 +            fallbackSCSV=fallbackSCSV)
          for result in self._handshakeWrapperAsync(handshaker, checker):
              yield result
  
-@@ -1057,7 +1061,8 @@ class TLSConnection(TLSRecordLayer):
-     def _handshakeServerAsyncHelper(self, sharedKeyDB, verifierDB,
-                                     certChain, privateKey, reqCert,
-                                     sessionCache, settings, reqCAs,
--                                    tlsIntolerant, signedCertTimestamps):
-+                                    tlsIntolerant, signedCertTimestamps,
-+                                    fallbackSCSV):
+@@ -1099,7 +1108,7 @@ class TLSConnection(TLSRecordLayer):
+                              settings, reqCAs, 
+                              tacks, activationFlags, 
+                              nextProtos, anon,
+-                             tlsIntolerant, signedCertTimestamps):
++                             tlsIntolerant, signedCertTimestamps, fallbackSCSV):
  
          self._handshakeStart(client=False)
  
-@@ -1141,12 +1146,18 @@ class TLSConnection(TLSRecordLayer):
-                 yield result
+@@ -1134,7 +1143,7 @@ class TLSConnection(TLSRecordLayer):
+         # Handle ClientHello and resumption
+         for result in self._serverGetClientHello(settings, certChain,\
+                                             verifierDB, sessionCache,
+-                                            anon, tlsIntolerant):
++                                            anon, tlsIntolerant, fallbackSCSV):
+             if result in (0,1): yield result
+             elif result == None:
+                 self._handshakeDone(resumed=True)                
+@@ -1234,7 +1243,7 @@ class TLSConnection(TLSRecordLayer):
  
-         #If client's version is too high, propose my highest version
--        elif clientHello.client_version > settings.maxVersion:
-+        if clientHello.client_version > settings.maxVersion:
+ 
+     def _serverGetClientHello(self, settings, certChain, verifierDB,
+-                                sessionCache, anon, tlsIntolerant):
++                                sessionCache, anon, tlsIntolerant, fallbackSCSV):
+         #Initialize acceptable cipher suites
+         cipherSuites = []
+         if verifierDB:
+@@ -1280,6 +1289,13 @@ class TLSConnection(TLSRecordLayer):
+         elif clientHello.client_version > settings.maxVersion:
              self.version = settings.maxVersion
--
+ 
++        #Detect if the client performed an inappropriate fallback.
++        elif fallbackSCSV and clientHello.client_version < settings.maxVersion:
++            if CipherSuite.TLS_FALLBACK_SCSV in clientHello.cipher_suites:
++                for result in self._sendError(\
++                        AlertDescription.inappropriate_fallback):
++                    yield result
++
          else:
              #Set the version to the client's version
-             self.version = clientHello.client_version
-+            if (fallbackSCSV and
-+                clientHello.client_version < settings.maxVersion):
-+                for cipherSuite in clientHello.cipher_suites:
-+                    if cipherSuite == 0x5600:
-+                        for result in self._sendError(\
-+                                AlertDescription.inappropriate_fallback):
-+                            yield result
- 
-         #Get the client nonce; create server nonce
-         clientRandom = clientHello.random
-diff --git a/third_party/tlslite/tlslite/constants.py b/third_party/tlslite/tlslite/constants.py
-index b5a345a..23e3dcb 100644
---- a/third_party/tlslite/tlslite/constants.py
-+++ b/third_party/tlslite/tlslite/constants.py
-@@ -91,6 +91,7 @@ class AlertDescription:
-     protocol_version = 70
-     insufficient_security = 71
-     internal_error = 80
-+    inappropriate_fallback = 86
-     user_canceled = 90
-     no_renegotiation = 100
-     unknown_srp_username = 120
-diff --git a/third_party/tlslite/tlslite/errors.py b/third_party/tlslite/tlslite/errors.py
-index c7f7ba8..45087e6 100644
---- a/third_party/tlslite/tlslite/errors.py
-+++ b/third_party/tlslite/tlslite/errors.py
-@@ -48,6 +48,7 @@ class TLSAlert(TLSError):
-         AlertDescription.protocol_version: "protocol_version",\
-         AlertDescription.insufficient_security: "insufficient_security",\
-         AlertDescription.internal_error: "internal_error",\
-+        AlertDescription.inappropriate_fallback: "inappropriate_fallback",\
-         AlertDescription.user_canceled: "user_canceled",\
-         AlertDescription.no_renegotiation: "no_renegotiation",\
-         AlertDescription.unknown_srp_username: "unknown_srp_username",\
+             self.version = clientHello.client_version