net: don't add padding extension for SSLv3.

net/third_party/nss/patches/paddingextension.patch

 diff --git a/nss/lib/ssl/ssl3con.c b/nss/lib/ssl/ssl3con.c
-index 8b8b758..567d481 100644
+index 567d481..8eb3ab5 100644
 --- a/nss/lib/ssl/ssl3con.c
 +++ b/nss/lib/ssl/ssl3con.c
-@@ -4975,6 +4975,7 @@ ssl3_SendClientHello(sslSocket *ss, PRBool resending)
+@@ -4975,7 +4975,7 @@ ssl3_SendClientHello(sslSocket *ss, PRBool resending)
      PRBool           isTLS = PR_FALSE;
      PRBool           requestingResume = PR_FALSE;
      PRInt32          total_exten_len = 0;
-+    unsigned         paddingExtensionLen;
+-    unsigned         paddingExtensionLen;
++    PRInt32          paddingExtensionLen;
      unsigned         numCompressionMethods;
      PRInt32          flags;
  
-@@ -5241,6 +5242,20 @@ ssl3_SendClientHello(sslSocket *ss, PRBool resending)
-        length += 1 + ss->ssl3.hs.cookieLen;
-     }
- 
-+    /* A padding extension may be included to ensure that the record containing
-+     * the ClientHello doesn't have a length between 256 and 511 bytes
-+     * (inclusive). Initial, ClientHello records with such lengths trigger bugs
-+     * in F5 devices.
-+     *
-+     * This is not done for DTLS nor for renegotiation. */
-+    if (!IS_DTLS(ss) && !ss->firstHsDone) {
-+        paddingExtensionLen = ssl3_CalculatePaddingExtensionLength(length);
-+        total_exten_len += paddingExtensionLen;
-+        length += paddingExtensionLen;
-+    } else {
-+        paddingExtensionLen = 0;
-+    }
-+
-     rv = ssl3_AppendHandshakeHeader(ss, client_hello, length);
-     if (rv != SECSuccess) {
-        return rv;      /* err set by ssl3_AppendHandshake* */
-@@ -5360,6 +5375,13 @@ ssl3_SendClientHello(sslSocket *ss, PRBool resending)
-            return SECFailure;
-        }
-        maxBytes -= extLen;
-+
-+       extLen = ssl3_AppendPaddingExtension(ss, paddingExtensionLen, maxBytes);
-+       if (extLen < 0) {
-+           return SECFailure;
-+       }
-+       maxBytes -= extLen;
-+
-        PORT_Assert(!maxBytes);
-     } 
-     if (ss->ssl3.hs.sendingSCSV) {
+@@ -5248,7 +5248,7 @@ ssl3_SendClientHello(sslSocket *ss, PRBool resending)
+      * in F5 devices.
+      *
+      * This is not done for DTLS nor for renegotiation. */
+-    if (!IS_DTLS(ss) && !ss->firstHsDone) {
++    if (!IS_DTLS(ss) && isTLS && !ss->firstHsDone) {
+         paddingExtensionLen = ssl3_CalculatePaddingExtensionLength(length);
+         total_exten_len += paddingExtensionLen;
+         length += paddingExtensionLen;
 diff --git a/nss/lib/ssl/ssl3ext.c b/nss/lib/ssl/ssl3ext.c
-index 0415770..8be042e 100644
+index 8be042e..ea2cf7a 100644
 --- a/nss/lib/ssl/ssl3ext.c
 +++ b/nss/lib/ssl/ssl3ext.c
-@@ -2297,3 +2297,56 @@ ssl3_ClientSendSigAlgsXtn(sslSocket * ss, PRBool append, PRUint32 maxBytes)
- loser:
+@@ -2298,7 +2298,7 @@ loser:
      return -1;
  }
-+
-+unsigned int
-+ssl3_CalculatePaddingExtensionLength(unsigned int clientHelloLength)
-+{
-+    unsigned int recordLength = 1 /* handshake message type */ +
-+                               3 /* handshake message length */ +
-+                               clientHelloLength;
-+    unsigned int extensionLength;
-+
-+    if (recordLength < 256 || recordLength >= 512) {
-+       return 0;
-+    }
-+
-+     extensionLength = 512 - recordLength;
-+     /* Extensions take at least four bytes to encode. */
-+     if (extensionLength < 4) {
-+        extensionLength = 4;
-+     }
-+
-+     return extensionLength;
-+}
-+
-+/* ssl3_AppendPaddingExtension possibly adds an extension which ensures that a
-+ * ClientHello record is either < 256 bytes or is >= 512 bytes. This ensures
-+ * that we don't trigger bugs in F5 products. */
-+unsigned int
-+ssl3_AppendPaddingExtension(sslSocket *ss, unsigned int extensionLen,
-+                           PRUint32 maxBytes)
-+{
-+    unsigned int paddingLen = extensionLen - 4;
-+    unsigned char padding[256];
-+
-+    if (extensionLen == 0) {
-+       return 0;
-+    }
-+
-+    if (extensionLen < 4 ||
-+       extensionLen > maxBytes ||
-+       paddingLen > sizeof(padding)) {
-+       PORT_Assert(0);
-+       return 0;
-+    }
-+
-+    if (SECSuccess != ssl3_AppendHandshakeNumber(ss, ssl_padding_xtn, 2))
-+       return -1;
-+    if (SECSuccess != ssl3_AppendHandshakeNumber(ss, paddingLen, 2))
-+       return -1;
-+    memset(padding, ' ', paddingLen);
-+    if (SECSuccess != ssl3_AppendHandshake(ss, padding, paddingLen))
-+       return -1;
-+
-+    return extensionLen;
-+}
+ 
+-unsigned int
++PRInt32
+ ssl3_CalculatePaddingExtensionLength(unsigned int clientHelloLength)
+ {
+     unsigned int recordLength = 1 /* handshake message type */ +
 diff --git a/nss/lib/ssl/sslimpl.h b/nss/lib/ssl/sslimpl.h
-index 614eed1..621f25e 100644
+index 621f25e..fdf5b8f 100644
 --- a/nss/lib/ssl/sslimpl.h
 +++ b/nss/lib/ssl/sslimpl.h
-@@ -237,6 +237,13 @@ extern PRInt32
+@@ -237,7 +237,7 @@ extern PRInt32
  ssl3_CallHelloExtensionSenders(sslSocket *ss, PRBool append, PRUint32 maxBytes,
                                 const ssl3HelloExtensionSender *sender);
  
-+extern unsigned int
-+ssl3_CalculatePaddingExtensionLength(unsigned int clientHelloLength);
-+
-+extern unsigned int
-+ssl3_AppendPaddingExtension(sslSocket *ss, unsigned int extensionLen,
-+                           PRUint32 maxBytes);
-+
- /* Socket ops */
- struct sslSocketOpsStr {
-     int         (*connect) (sslSocket *, const PRNetAddr *);
-diff --git a/nss/lib/ssl/sslt.h b/nss/lib/ssl/sslt.h
-index a8007d8..e4d188f 100644
---- a/nss/lib/ssl/sslt.h
-+++ b/nss/lib/ssl/sslt.h
-@@ -205,9 +205,10 @@ typedef enum {
-     ssl_session_ticket_xtn           = 35,
-     ssl_next_proto_nego_xtn          = 13172,
-     ssl_channel_id_xtn               = 30031,
-+    ssl_padding_xtn                  = 35655,
-     ssl_renegotiation_info_xtn       = 0xff01  /* experimental number */
- } SSLExtensionType;
+-extern unsigned int
++extern PRInt32
+ ssl3_CalculatePaddingExtensionLength(unsigned int clientHelloLength);
  
--#define SSL_MAX_EXTENSIONS             11
-+#define SSL_MAX_EXTENSIONS             11 /* doesn't include ssl_padding_xtn. */
- 
- #endif /* __sslt_h_ */
+ extern unsigned int