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Free HS data on rehandshake 

When we call _Rehandshake before we receive application data and the receive application data during the renegotiation process then it is possible for the send queue to be preemptively deleted
pull/3671/head
Juliusz Sosinowicz 2021-01-15 12:49:11 +01:00
parent 57b06f700d
commit 774fdc9fd6
1 changed files with 26 additions and 0 deletions
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26
src/internal.c
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@ -6559,6 +6559,7 @@ void SSL_ResourceFree(WOLFSSL* ssl)
/* Free any handshake resources no longer needed */
void FreeHandshakeResources(WOLFSSL* ssl)
{
WOLFSSL_ENTER("FreeHandshakeResources");
#ifdef WOLFSSL_DTLS
/* DTLS_POOL */
@ -6929,6 +6930,7 @@ void WriteSEQ(WOLFSSL* ssl, int verifyOrder, byte* out)
DtlsMsg* DtlsMsgNew(word32 sz, void* heap)
{
DtlsMsg* msg;
WOLFSSL_ENTER("DtlsMsgNew()");
(void)heap;
msg = (DtlsMsg*)XMALLOC(sizeof(DtlsMsg), heap, DYNAMIC_TYPE_DTLS_MSG);
@ -6954,6 +6956,7 @@ DtlsMsg* DtlsMsgNew(word32 sz, void* heap)
void DtlsMsgDelete(DtlsMsg* item, void* heap)
{
(void)heap;
WOLFSSL_ENTER("DtlsMsgDelete()");
if (item != NULL) {
DtlsFrag* cur = item->fragList;
@ -6972,6 +6975,7 @@ void DtlsMsgDelete(DtlsMsg* item, void* heap)
void DtlsMsgListDelete(DtlsMsg* head, void* heap)
{
DtlsMsg* next;
WOLFSSL_ENTER("DtlsMsgListDelete()");
while (head) {
next = head->next;
DtlsMsgDelete(head, heap);
@ -6986,6 +6990,7 @@ void DtlsTxMsgListClean(WOLFSSL* ssl)
{
DtlsMsg* head = ssl->dtls_tx_msg_list;
DtlsMsg* next;
WOLFSSL_ENTER("DtlsTxMsgListClean()");
while (head) {
next = head->next;
if (VerifyForTxDtlsMsgDelete(ssl, head))
@ -7009,6 +7014,8 @@ static DtlsFrag* CreateFragment(word32* begin, word32 end, const byte* data,
DtlsFrag* newFrag;
word32 added = end - *begin + 1;
WOLFSSL_ENTER("CreateFragment()");
(void)heap;
newFrag = (DtlsFrag*)XMALLOC(sizeof(DtlsFrag), heap,
DYNAMIC_TYPE_DTLS_FRAG);
@ -7029,6 +7036,7 @@ static DtlsFrag* CreateFragment(word32* begin, word32 end, const byte* data,
int DtlsMsgSet(DtlsMsg* msg, word32 seq, word16 epoch, const byte* data, byte type,
word32 fragOffset, word32 fragSz, void* heap)
{
WOLFSSL_ENTER("DtlsMsgSet()");
if (msg != NULL && data != NULL && msg->fragSz <= msg->sz &&
(fragOffset + fragSz) <= msg->sz) {
DtlsFrag* cur = msg->fragList;
@ -7130,6 +7138,7 @@ int DtlsMsgSet(DtlsMsg* msg, word32 seq, word16 epoch, const byte* data, byte ty
DtlsMsg* DtlsMsgFind(DtlsMsg* head, word32 epoch, word32 seq)
{
WOLFSSL_ENTER("DtlsMsgFind()");
while (head != NULL && !(head->epoch == epoch && head->seq == seq)) {
head = head->next;
}
@ -7158,6 +7167,7 @@ void DtlsMsgStore(WOLFSSL* ssl, word32 epoch, word32 seq, const byte* data,
*/
DtlsMsg* head = ssl->dtls_rx_msg_list;
WOLFSSL_ENTER("DtlsMsgStore()");
if (head != NULL) {
DtlsMsg* cur = DtlsMsgFind(head, epoch, seq);
@ -7199,6 +7209,7 @@ void DtlsMsgStore(WOLFSSL* ssl, word32 epoch, word32 seq, const byte* data,
/* DtlsMsgInsert() is an in-order insert. */
DtlsMsg* DtlsMsgInsert(DtlsMsg* head, DtlsMsg* item)
{
WOLFSSL_ENTER("DtlsMsgInsert()");
if (head == NULL || (item->epoch <= head->epoch &&
item->seq < head->seq)) {
item->next = head;
@ -7279,6 +7290,7 @@ int DtlsMsgPoolSave(WOLFSSL* ssl, const byte* data, word32 dataSz,
int DtlsMsgPoolTimeout(WOLFSSL* ssl)
{
int result = -1;
WOLFSSL_ENTER("DtlsMsgPoolTimeout()");
if (ssl->dtls_timeout < ssl->dtls_timeout_max) {
ssl->dtls_timeout *= DTLS_TIMEOUT_MULTIPLIER;
result = 0;
@ -7326,6 +7338,7 @@ int VerifyForDtlsMsgPoolSend(WOLFSSL* ssl, byte type, word32 fragOffset)
*/
int VerifyForTxDtlsMsgDelete(WOLFSSL* ssl, DtlsMsg* item)
{
WOLFSSL_ENTER("VerifyForTxDtlsMsgDelete()");
if (item->epoch < ssl->keys.dtls_epoch - 1)
/* Messages not from current or previous epoch can be deleted */
return 1;
@ -15882,8 +15895,21 @@ int ProcessReply(WOLFSSL* ssl)
WOLFSSL_MSG("got app DATA");
#ifdef WOLFSSL_DTLS
if (ssl->options.dtls && ssl->options.dtlsHsRetain) {
#ifdef HAVE_SECURE_RENEGOTIATION
/*
* Only free HS resources when not in the process of a
* secure renegotiation and we have received APP DATA
* from the current epoch
*/
if (!IsSCR(ssl) && (DtlsUseSCRKeys(ssl)
|| !DtlsSCRKeysSet(ssl))) {
FreeHandshakeResources(ssl);
ssl->options.dtlsHsRetain = 0;
}
#else
FreeHandshakeResources(ssl);
ssl->options.dtlsHsRetain = 0;
#endif
}
#endif
#ifdef WOLFSSL_TLS13