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Merge pull request #2934 from SparkiDev/tls13_cookie_ks

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TLS13: Prepend the SupportedVersions extension to list
This commit is contained in:
toddouska
2020-04-30 14:58:11 -07:00
committed by GitHub
parent a1489d981c 7879d3762a
commit df9dd3012f
1 changed files with 43 additions and 2 deletions
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45
src/tls.c
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@ -1374,6 +1374,43 @@ static int TLSX_Push(TLSX** list, TLSX_Type type, void* data, void* heap)
return 0;
}
#ifdef WOLFSSL_TLS13
/**
* Creates a new extension and prepend it to the provided list.
* Checks for duplicate extensions, keeps the newest.
*/
static int TLSX_Prepend(TLSX** list, TLSX_Type type, void* data, void* heap)
{
TLSX* extension = TLSX_New(type, data, heap);
TLSX* curr = *list;
if (extension == NULL)
return MEMORY_E;
/* remove duplicate extensions, there should be only one of each type. */
while (curr && curr->next) {
if (curr->next->type == type) {
TLSX *next = curr->next;
curr->next = next->next;
next->next = NULL;
TLSX_FreeAll(next, heap);
}
curr = curr->next;
}
if (curr)
curr->next = extension;
else
*list = extension;
return 0;
}
#endif /* WOLFSSL_TLS13 */
#ifndef NO_WOLFSSL_CLIENT
int TLSX_CheckUnsupportedExtension(WOLFSSL* ssl, TLSX_Type type);
@ -5997,6 +6034,7 @@ static int TLSX_SupportedVersions_Parse(WOLFSSL* ssl, byte* input,
byte major, minor;
int newMinor = 0;
int set = 0;
int ret;
if (msgType == client_hello) {
/* Must contain a length and at least one version. */
@ -6049,8 +6087,11 @@ static int TLSX_SupportedVersions_Parse(WOLFSSL* ssl, byte* input,
if (minor >= TLSv1_3_MINOR) {
if (!ssl->options.tls1_3) {
ssl->options.tls1_3 = 1;
TLSX_Push(&ssl->extensions, TLSX_SUPPORTED_VERSIONS, ssl,
ssl->heap);
ret = TLSX_Prepend(&ssl->extensions,
TLSX_SUPPORTED_VERSIONS, ssl, ssl->heap);
if (ret != 0) {
return ret;
}
#ifndef WOLFSSL_TLS13_DRAFT_18
TLSX_SetResponse(ssl, TLSX_SUPPORTED_VERSIONS);
#endif