[package] cyassl: add a patch to better check legacy SSLv2 client hello records

If junk data is received during SSL_accept(), cyassl will treat it as legacy SSLv2
record without performing further plausibility checks. Change the legacy code path
to return UNKNOWN_HANDSHAKE_TYPE if the value of the third byte isn't 0x01 the
hello message type.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33675 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 13 insertions, 0 deletions

diff --git a/package/libs/cyassl/patches/200-SSL_accept-handle-hello-garbage.patch b/package/libs/cyassl/patches/200-SSL_accept-handle-hello-garbage.patch
new file mode 100644
index 0000000000..4a6b8da67e
--- /dev/null
+++ b/package/libs/cyassl/patches/200-SSL_accept-handle-hello-garbage.patch
@@ -0,0 +1,13 @@
+--- a/src/cyassl_int.c
++++ b/src/cyassl_int.c
+@@ -1588,6 +1588,10 @@
+                 b1 =
+                 ssl->buffers.inputBuffer.buffer[ssl->buffers.inputBuffer.idx++];
+                 ssl->curSize = ((b0 & 0x7f) << 8) | b1;
++
++                /* does not appear to a be a SSLv2 client hello */
++                if ( ssl->buffers.inputBuffer.buffer[ssl->buffers.inputBuffer.idx] != 1 )
++                    return UNKNOWN_HANDSHAKE_TYPE;
+             }
+             else {
+                 ssl->options.processReply = getRecordLayerHeader;