Issue #9177: Calling read() or write() now raises ValueError, not AttributeError, on a closed SSL socket.

Patch by Senko Rasic.

Lib/ssl.py

@@ -402,6 +402,8 @@ class SSLSocket(socket):
         Return zero-length string on EOF."""
 
         self._checkClosed()
+        if not self._sslobj:
+            raise ValueError("Read on closed or unwrapped SSL socket.")
         try:
             if buffer is not None:
                 v = self._sslobj.read(len, buffer)
@@ -422,6 +424,8 @@ class SSLSocket(socket):
         number of bytes of DATA actually transmitted."""
 
         self._checkClosed()
+        if not self._sslobj:
+            raise ValueError("Write on closed or unwrapped SSL socket.")
         return self._sslobj.write(data)
 
     def getpeercert(self, binary_form=False):

Lib/test/test_ssl.py

@@ -2311,6 +2311,21 @@ else:
             self.assertEqual(cm.exception.reason, 'TLSV1_ALERT_INTERNAL_ERROR')
             self.assertIn("TypeError", stderr.getvalue())
 
+        def test_read_write_after_close_raises_valuerror(self):
+            context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
+            context.verify_mode = ssl.CERT_REQUIRED
+            context.load_verify_locations(CERTFILE)
+            context.load_cert_chain(CERTFILE)
+            server = ThreadedEchoServer(context=context, chatty=False)
+
+            with server:
+                s = context.wrap_socket(socket.socket())
+                s.connect((HOST, server.port))
+                s.close()
+
+                self.assertRaises(ValueError, s.read, 1024)
+                self.assertRaises(ValueError, s.write, 'hello')
+
 
 def test_main(verbose=False):
     if support.verbose:

Misc/ACKS

@@ -1021,6 +1021,7 @@ Jérôme Radix
 Burton Radons
 Jeff Ramnani
 Brodie Rao
+Senko Rasic
 Antti Rasinen
 Sridhar Ratnakumar
 Ysj Ray

Misc/NEWS

@@ -159,6 +159,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #9177: Calling read() or write() now raises ValueError, not
+  AttributeError, on a closed SSL socket.  Patch by Senko Rasic.
+
 - Issue #18513: Fix behaviour of cmath.rect w.r.t. signed zeros on OS X 10.8 +
   gcc.