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Merge pull request #1959 from SparkiDev/tls13_ems_down

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Send EMS extension in ClientHello when downgradable from TLSv1.3
This commit is contained in:
toddouska
2018-12-06 07:42:55 -08:00
committed by GitHub
parent d6ebd2d832 1d5b99eecc
commit 6dfc723961
1 changed files with 4 additions and 2 deletions
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6
src/tls.c
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@@ -9382,7 +9382,7 @@ int TLSX_GetRequestSize(WOLFSSL* ssl, byte msgType, word16* pLength)
#ifdef HAVE_EXTENDED_MASTER
if (msgType == client_hello && ssl->options.haveEMS &&
!IsAtLeastTLSv1_3(ssl->version)) {
(!IsAtLeastTLSv1_3(ssl->version) || ssl->options.downgrade)) {
length += HELLO_EXT_SZ;
}
#endif
@@ -9483,7 +9483,8 @@ int TLSX_WriteRequest(WOLFSSL* ssl, byte* output, byte msgType, word16* pOffset)
#ifdef HAVE_EXTENDED_MASTER
if (msgType == client_hello && ssl->options.haveEMS &&
!IsAtLeastTLSv1_3(ssl->version)) {
(!IsAtLeastTLSv1_3(ssl->version) || ssl->options.downgrade)) {
WOLFSSL_MSG("EMS extension to write");
c16toa(HELLO_EXT_EXTMS, output + offset);
offset += HELLO_EXT_TYPE_SZ;
c16toa(0, output + offset);
@@ -9728,6 +9729,7 @@ int TLSX_WriteResponse(WOLFSSL *ssl, byte* output, byte msgType, word16* pOffset
#ifdef HAVE_EXTENDED_MASTER
if (ssl->options.haveEMS && msgType == server_hello &&
!IsAtLeastTLSv1_3(ssl->version)) {
WOLFSSL_MSG("EMS extension to write");
c16toa(HELLO_EXT_EXTMS, output + offset);
offset += HELLO_EXT_TYPE_SZ;
c16toa(0, output + offset);