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Merge pull request #5840 from kareem-wolfssl/dynSessCache2

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Add dynamic session cache which allocates sessions from the heap.
This commit is contained in:
Sean Parkinson
2023-02-22 15:14:38 +10:00
committed by GitHub
parent 74bad76707 8de2eba9ab
commit b81759173a
2 changed files with 122 additions and 19 deletions
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135
src/ssl.c
View File

@ -191,6 +191,12 @@
* ClientCache by default for backwards compatibility. This define will
* make wolfSSL_get_session return a reference to ssl->session. The returned
* pointer will be freed with the related WOLFSSL object.
* SESSION_CACHE_DYNAMIC_MEM:
* Dynamically allocate sessions for the session cache from the heap, as
* opposed to the default which allocates from the stack. Allocates
* memory only when a session is added to the cache, frees memory after the
* session is no longer being used. Recommended for memory-constrained
* systems.
* WOLFSSL_SYS_CA_CERTS
* Enables ability to load system CA certs from the OS via
* wolfSSL_CTX_load_system_CA_certs.
@ -6196,7 +6202,12 @@ int AddCA(WOLFSSL_CERT_MANAGER* cm, DerBuffer** pDer, int type, int verify)
typedef struct SessionRow {
int nextIdx; /* where to place next one */
int totalCount; /* sessions ever on this row */
#ifdef SESSION_CACHE_DYNAMIC_MEM
WOLFSSL_SESSION* Sessions[SESSIONS_PER_ROW];
void* heap;
#else
WOLFSSL_SESSION Sessions[SESSIONS_PER_ROW];
#endif
#ifdef ENABLE_SESSION_CACHE_ROW_LOCK
/* not included in import/export */
@ -11475,7 +11486,13 @@ int wolfSSL_SetServerID(WOLFSSL* ssl, const byte* id, int len, int newSession)
#endif /* !NO_CLIENT_CACHE */
#if defined(PERSIST_SESSION_CACHE)
/* TODO: Add SESSION_CACHE_DYNAMIC_MEM support for PERSIST_SESSION_CACHE.
* Need a count of current sessions to get an accurate memsize (totalCount is
* not decremented when sessions are removed).
* Need to determine ideal layout for mem/filesave.
* Also need mem/filesave checking to ensure not restoring non DYNAMIC_MEM cache.
*/
#if defined(PERSIST_SESSION_CACHE) && !defined(SESSION_CACHE_DYNAMIC_MEM)
/* for persistence, if changes to layout need to increment and modify
save_session_cache() and restore_session_cache and memory versions too */
@ -11499,7 +11516,6 @@ typedef struct {
PERSISTENT_SESSION_CACHE functions
*/
/* get how big the the session cache save buffer needs to be */
int wolfSSL_get_session_cache_memsize(void)
{
@ -11804,7 +11820,7 @@ int wolfSSL_restore_session_cache(const char *fname)
}
#endif /* !NO_FILESYSTEM */
#endif /* PERSIST_SESSION_CACHE */
#endif /* PERSIST_SESSION_CACHE && !SESSION_CACHE_DYNAMIC_MEM */
#endif /* NO_SESSION_CACHE */
@ -14128,8 +14144,12 @@ int wolfSSL_Cleanup(void)
{
int ret = WOLFSSL_SUCCESS; /* Only the first error will be returned */
int release = 0;
#if !defined(NO_SESSION_CACHE) && defined(ENABLE_SESSION_CACHE_ROW_LOCK)
#if !defined(NO_SESSION_CACHE) && (defined(ENABLE_SESSION_CACHE_ROW_LOCK) || \
defined(SESSION_CACHE_DYNAMIC_MEM))
int i;
#ifdef SESSION_CACHE_DYNAMIC_MEM
int j;
#endif
#endif
WOLFSSL_ENTER("wolfSSL_Cleanup");
@ -14177,6 +14197,17 @@ int wolfSSL_Cleanup(void)
}
session_lock_valid = 0;
#endif
#ifdef SESSION_CACHE_DYNAMIC_MEM
for (i = 0; i < SESSION_ROWS; i++) {
for (j = 0; j < SESSIONS_PER_ROW; j++) {
if (SessionCache[i].Sessions[j]) {
XFREE(SessionCache[i].Sessions[j], SessionCache[i].heap,
DYNAMIC_TYPE_SESSION);
SessionCache[i].Sessions[j] = NULL;
}
}
}
#endif
#ifndef NO_CLIENT_CACHE
if ((clisession_mutex_valid == 1) &&
(wc_FreeMutex(&clisession_mutex) != 0)) {
@ -14401,8 +14432,12 @@ WOLFSSL_SESSION* wolfSSL_GetSessionClient(WOLFSSL* ssl, const byte* id, int len)
break;
}
#ifdef SESSION_CACHE_DYNAMIC_MEM
current = sessRow->Sessions[clSess[idx].serverIdx];
#else
current = &sessRow->Sessions[clSess[idx].serverIdx];
if (XMEMCMP(current->serverID, id, len) == 0) {
#endif
if (current && XMEMCMP(current->serverID, id, len) == 0) {
WOLFSSL_MSG("Found a serverid match for client");
if (LowResTimer() < (current->bornOn + current->timeout)) {
WOLFSSL_MSG("Session valid");
@ -14513,8 +14548,12 @@ int TlsSessionCacheGetAndLock(const byte *id, WOLFSSL_SESSION **sess,
idx = SESSIONS_PER_ROW - 1; /* if back to front, the previous was end */
}
for (; count > 0; --count) {
#ifdef SESSION_CACHE_DYNAMIC_MEM
s = sessRow->Sessions[idx];
#else
s = &sessRow->Sessions[idx];
if (XMEMCMP(s->sessionID, id, ID_LEN) == 0) {
#endif
if (s && XMEMCMP(s->sessionID, id, ID_LEN) == 0) {
*sess = s;
break;
}
@ -15086,8 +15125,12 @@ WOLFSSL_SESSION* ClientSessionToSession(const WOLFSSL_SESSION* session)
}
}
if (error == 0) {
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[clientSession->serverIdx];
#else
cacheSession = &sessRow->Sessions[clientSession->serverIdx];
if (cacheSession->sessionIDSz == 0) {
#endif
if (cacheSession && cacheSession->sessionIDSz == 0) {
cacheSession = NULL;
WOLFSSL_MSG("Session cache entry not set");
error = -1;
@ -15227,9 +15270,14 @@ int AddSessionToCache(WOLFSSL_CTX* ctx, WOLFSSL_SESSION* addSession,
}
for (i = 0; i < SESSIONS_PER_ROW && i < sessRow->totalCount; i++) {
if (XMEMCMP(id,
sessRow->Sessions[i].sessionID, ID_LEN) == 0 &&
sessRow->Sessions[i].side == side) {
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[i];
#else
cacheSession = &sessRow->Sessions[i];
#endif
if (cacheSession && XMEMCMP(id,
cacheSession->sessionID, ID_LEN) == 0 &&
cacheSession->side == side) {
WOLFSSL_MSG("Session already exists. Overwriting.");
overwrite = 1;
idx = i;
@ -15243,7 +15291,23 @@ int AddSessionToCache(WOLFSSL_CTX* ctx, WOLFSSL_SESSION* addSession,
if (sessionIndex != NULL)
*sessionIndex = (row << SESSIDX_ROW_SHIFT) | idx;
#endif
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[idx];
if (cacheSession) {
XFREE(cacheSession, sessRow->heap, DYNAMIC_TYPE_SESSION);
cacheSession = NULL;
}
cacheSession = (WOLFSSL_SESSION*) XMALLOC(sizeof(WOLFSSL_SESSION), sessRow->heap,
DYNAMIC_TYPE_SESSION);
if (cacheSession == NULL) {
return MEMORY_E;
}
XMEMSET(cacheSession, 0, sizeof(WOLFSSL_SESSION));
sessRow->Sessions[idx] = cacheSession;
#else
cacheSession = &sessRow->Sessions[idx];
#endif
#ifdef HAVE_EX_DATA
if (cacheSession->ownExData) {
@ -15561,6 +15625,7 @@ int wolfSSL_GetSessionAtIndex(int idx, WOLFSSL_SESSION* session)
{
int row, col, result = WOLFSSL_FAILURE;
SessionRow* sessRow;
WOLFSSL_SESSION* cacheSession;
WOLFSSL_ENTER("wolfSSL_GetSessionAtIndex");
@ -15579,8 +15644,18 @@ int wolfSSL_GetSessionAtIndex(int idx, WOLFSSL_SESSION* session)
return BAD_MUTEX_E;
}
XMEMCPY(session, &sessRow->Sessions[col], sizeof(WOLFSSL_SESSION));
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[col];
#else
cacheSession = &sessRow->Sessions[col];
#endif
if (cacheSession) {
XMEMCPY(session, cacheSession, sizeof(WOLFSSL_SESSION));
result = WOLFSSL_SUCCESS;
}
else {
result = WOLFSSL_FAILURE;
}
SESSION_ROW_UNLOCK(sessRow);
@ -15679,8 +15754,15 @@ static int get_locked_session_stats(word32* active, word32* total, word32* peak)
for (; count > 0; --count) {
/* if not expired then good */
#ifdef SESSION_CACHE_DYNAMIC_MEM
if (row->Sessions[idx] &&
ticks < (row->Sessions[idx]->bornOn +
row->Sessions[idx]->timeout) )
#else
if (ticks < (row->Sessions[idx].bornOn +
row->Sessions[idx].timeout) ) {
row->Sessions[idx].timeout) )
#endif
{
now++;
}
@ -32510,6 +32592,7 @@ static void SESSION_ex_data_cache_update(WOLFSSL_SESSION* session, int idx,
int i;
int error = 0;
SessionRow* sessRow = NULL;
WOLFSSL_SESSION* cacheSession = NULL;
const byte* id;
byte foundCache = 0;
@ -32539,20 +32622,26 @@ static void SESSION_ex_data_cache_update(WOLFSSL_SESSION* session, int idx,
}
for (i = 0; i < SESSIONS_PER_ROW && i < sessRow->totalCount; i++) {
if (XMEMCMP(id, sessRow->Sessions[i].sessionID, ID_LEN) == 0
&& session->side == sessRow->Sessions[i].side
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[i];
#else
cacheSession = &sessRow->Sessions[i];
#endif
if (cacheSession &&
XMEMCMP(id, cacheSession->sessionID, ID_LEN) == 0
&& session->side == cacheSession->side
#if defined(WOLFSSL_TLS13) && defined(HAVE_SESSION_TICKET)
&& (IsAtLeastTLSv1_3(session->version) ==
IsAtLeastTLSv1_3(sessRow->Sessions[i].version))
IsAtLeastTLSv1_3(cacheSession->version))
#endif
) {
if (get) {
*getRet = wolfSSL_CRYPTO_get_ex_data(
&sessRow->Sessions[i].ex_data, idx);
&cacheSession->ex_data, idx);
}
else {
*setRet = wolfSSL_CRYPTO_set_ex_data(
&sessRow->Sessions[i].ex_data, idx, data);
&cacheSession->ex_data, idx, data);
}
foundCache = 1;
break;
@ -34390,8 +34479,13 @@ int wolfSSL_SSL_CTX_remove_session(WOLFSSL_CTX *ctx, WOLFSSL_SESSION *s)
}
for (i = 0; i < SESSIONS_PER_ROW && i < sessRow->totalCount; i++) {
#ifdef SESSION_CACHE_DYNAMIC_MEM
cacheSession = sessRow->Sessions[i];
#else
cacheSession = &sessRow->Sessions[i];
if (XMEMCMP(id, cacheSession->sessionID, ID_LEN) == 0) {
#endif
if (cacheSession &&
XMEMCMP(id, cacheSession->sessionID, ID_LEN) == 0) {
if (ctx->method->side != cacheSession->side)
continue;
cacheSession->timeout = 0;
@ -34405,6 +34499,11 @@ int wolfSSL_SSL_CTX_remove_session(WOLFSSL_CTX *ctx, WOLFSSL_SESSION *s)
cacheSession->ownExData = 0; /* We clear below */
s->ownExData = 1;
#endif
#ifdef SESSION_CACHE_DYNAMIC_MEM
XFREE(cacheSession, sessRow->heap, DYNAMIC_TYPE_SESSION);
sessRow->Sessions[i] = NULL;
#endif
break;
}
}

4
wolfssl/wolfcrypt/settings.h
View File

@ -2940,6 +2940,10 @@ extern void uITRON4_free(void *p) ;
#endif
#endif /* WOLFSSL_SYS_CA_CERTS */
#if defined(SESSION_CACHE_DYNAMIC_MEM) && defined(PERSIST_SESSION_CACHE)
#error "Dynamic session cache currently does not support persistent session cache."
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif