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TLS 1.3, plaintext alert: ignore when expecting encrypted
In TLS 1.3, ignore valid unencrypted alerts that appear after encryption has started. Only ignore WOLFSSL_ALERT_COUNT_MAX-1 alerts.
1 parent 5512c2d commit bfc90a4

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5 files changed

+286
-37
lines changed

5 files changed

+286
-37
lines changed

.github/workflows/os-check.yml

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -63,6 +63,8 @@ jobs:
6363
'--enable-coding=no',
6464
'--enable-dtls --enable-dtls13 --enable-ocspstapling --enable-ocspstapling2
6565
--enable-cert-setup-cb --enable-sessioncerts',
66+
'--enable-dtls --enable-dtls13 --enable-tls13
67+
CFLAGS=-DWOLFSSL_TLS13_IGNORE_PT_ALERT_ON_ENC',
6668
'--disable-sni --disable-ecc --disable-tls13 --disable-secure-renegotiation-info',
6769
'CPPFLAGS=-DWOLFSSL_BLIND_PRIVATE_KEY',
6870
'--enable-all --enable-certgencache',

.wolfssl_known_macro_extras

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -900,6 +900,7 @@ WOLFSSL_TICKET_ENC_HMAC_SHA512
900900
WOLFSSL_TI_CURRTIME
901901
WOLFSSL_TLS13_DRAFT
902902
WOLFSSL_TLS13_IGNORE_AEAD_LIMITS
903+
WOLFSSL_TLS13_IGNORE_PT_ALERT_ON_ENC
903904
WOLFSSL_TLS13_SHA512
904905
WOLFSSL_TLS13_TICKET_BEFORE_FINISHED
905906
WOLFSSL_TLSX_PQC_MLKEM_STORE_PRIV_KEY

src/internal.c

Lines changed: 58 additions & 35 deletions
Original file line numberDiff line numberDiff line change
@@ -21685,20 +21685,20 @@ static int DoAlert(WOLFSSL* ssl, byte* input, word32* inOutIdx, int* type)
2168521685
byte code;
2168621686
word32 dataSz = (word32)ssl->curSize;
2168721687

21688-
#if defined(WOLFSSL_CALLBACKS) || defined(OPENSSL_EXTRA)
21689-
if (ssl->hsInfoOn)
21690-
AddPacketName(ssl, "Alert");
21691-
if (ssl->toInfoOn) {
21692-
/* add record header back on to info + alert bytes level/code */
21693-
int ret = AddPacketInfo(ssl, "Alert", alert, input + *inOutIdx,
21694-
ALERT_SIZE, READ_PROTO, RECORD_HEADER_SZ, ssl->heap);
21695-
if (ret != 0)
21696-
return ret;
21697-
#ifdef WOLFSSL_CALLBACKS
21698-
AddLateRecordHeader(&ssl->curRL, &ssl->timeoutInfo);
21699-
#endif
21700-
}
21701-
#endif
21688+
#if defined(WOLFSSL_CALLBACKS) || defined(OPENSSL_EXTRA)
21689+
if (ssl->hsInfoOn)
21690+
AddPacketName(ssl, "Alert");
21691+
if (ssl->toInfoOn) {
21692+
/* add record header back on to info + alert bytes level/code */
21693+
int ret = AddPacketInfo(ssl, "Alert", alert, input + *inOutIdx,
21694+
ALERT_SIZE, READ_PROTO, RECORD_HEADER_SZ, ssl->heap);
21695+
if (ret != 0)
21696+
return ret;
21697+
#ifdef WOLFSSL_CALLBACKS
21698+
AddLateRecordHeader(&ssl->curRL, &ssl->timeoutInfo);
21699+
#endif
21700+
}
21701+
#endif
2170221702

2170321703
if (IsEncryptionOn(ssl, 0))
2170421704
dataSz -= ssl->keys.padSz;
@@ -21713,11 +21713,18 @@ static int DoAlert(WOLFSSL* ssl, byte* input, word32* inOutIdx, int* type)
2171321713

2171421714
level = input[(*inOutIdx)++];
2171521715
code = input[(*inOutIdx)++];
21716-
ssl->alert_history.last_rx.code = code;
21717-
ssl->alert_history.last_rx.level = level;
2171821716
*type = code;
21719-
if (level == alert_fatal) {
21720-
ssl->options.isClosed = 1; /* Don't send close_notify */
21717+
#ifdef WOLFSSL_TLS13_IGNORE_PT_ALERT_ON_ENC
21718+
/* Don't process alert when TLS 1.3 and encrypting but plaintext alert. */
21719+
if (!IsAtLeastTLSv1_3(ssl->version) || !IsEncryptionOn(ssl, 0) ||
21720+
ssl->keys.decryptedCur)
21721+
#endif
21722+
{
21723+
ssl->alert_history.last_rx.code = code;
21724+
ssl->alert_history.last_rx.level = level;
21725+
if (level == alert_fatal) {
21726+
ssl->options.isClosed = 1; /* Don't send close_notify */
21727+
}
2172121728
}
2172221729

2172321730
if (++ssl->options.alertCount >= WOLFSSL_ALERT_COUNT_MAX) {
@@ -21731,20 +21738,35 @@ static int DoAlert(WOLFSSL* ssl, byte* input, word32* inOutIdx, int* type)
2173121738
}
2173221739

2173321740
LogAlert(*type);
21734-
if (*type == close_notify) {
21735-
ssl->options.closeNotify = 1;
21741+
if (IsAtLeastTLSv1_3(ssl->version) && IsEncryptionOn(ssl, 0) &&
21742+
!ssl->keys.decryptedCur)
21743+
{
21744+
#ifdef WOLFSSL_TLS13_IGNORE_PT_ALERT_ON_ENC
21745+
/* Ignore alert if TLS 1.3 and encrypting but was plaintext alert. */
21746+
*type = invalid_alert;
21747+
level = alert_none;
21748+
21749+
#else
21750+
/* Unexpected message when encryption is on and alert not encrypted. */
21751+
SendAlert(ssl, alert_fatal, unexpected_message);
21752+
WOLFSSL_ERROR_VERBOSE(PARSE_ERROR);
21753+
return PARSE_ERROR;
21754+
#endif
2173621755
}
2173721756
else {
21738-
/*
21739-
* A close_notify alert doesn't mean there's been an error, so we only
21740-
* add other types of alerts to the error queue
21741-
*/
21742-
WOLFSSL_ERROR(*type);
21757+
if (*type == close_notify) {
21758+
ssl->options.closeNotify = 1;
21759+
}
21760+
else {
21761+
/*
21762+
* A close_notify alert doesn't mean there's been an error, so we
21763+
* only add other types of alerts to the error queue
21764+
*/
21765+
WOLFSSL_ERROR(*type);
21766+
}
2174321767
}
21744-
21745-
if (IsEncryptionOn(ssl, 0)) {
21768+
if (IsEncryptionOn(ssl, 0))
2174621769
*inOutIdx += ssl->keys.padSz;
21747-
}
2174821770

2174921771
return level;
2175021772
}
@@ -22495,7 +22517,8 @@ static int DoProcessReplyEx(WOLFSSL* ssl, int allowSocketErr)
2249522517
#ifdef WOLFSSL_TLS13
2249622518
if (IsAtLeastTLSv1_3(ssl->version) && IsEncryptionOn(ssl, 0) &&
2249722519
ssl->curRL.type != application_data &&
22498-
ssl->curRL.type != change_cipher_spec) {
22520+
ssl->curRL.type != change_cipher_spec &&
22521+
ssl->curRL.type != alert) {
2249922522
SendAlert(ssl, alert_fatal, unexpected_message);
2250022523
WOLFSSL_ERROR_VERBOSE(PARSE_ERROR);
2250122524
return PARSE_ERROR;
@@ -22603,9 +22626,9 @@ static int DoProcessReplyEx(WOLFSSL* ssl, int allowSocketErr)
2260322626
case decryptMessage:
2260422627

2260522628
if (IsEncryptionOn(ssl, 0) && ssl->keys.decryptedCur == 0 &&
22606-
(!IsAtLeastTLSv1_3(ssl->version) ||
22607-
ssl->curRL.type != change_cipher_spec))
22608-
{
22629+
(!IsAtLeastTLSv1_3(ssl->version) ||
22630+
(ssl->curRL.type != change_cipher_spec &&
22631+
ssl->curRL.type != alert))) {
2260922632
ret = DoDecrypt(ssl);
2261022633
#ifdef WOLFSSL_ASYNC_CRYPT
2261122634
if (ret == WC_NO_ERR_TRACE(WC_PENDING_E))
@@ -22682,9 +22705,9 @@ static int DoProcessReplyEx(WOLFSSL* ssl, int allowSocketErr)
2268222705
case verifyMessage:
2268322706

2268422707
if (IsEncryptionOn(ssl, 0) && ssl->keys.decryptedCur == 0 &&
22685-
(!IsAtLeastTLSv1_3(ssl->version) ||
22686-
ssl->curRL.type != change_cipher_spec))
22687-
{
22708+
(!IsAtLeastTLSv1_3(ssl->version) ||
22709+
(ssl->curRL.type != change_cipher_spec &&
22710+
ssl->curRL.type != alert))) {
2268822711
if (!atomicUser
2268922712
#if defined(HAVE_ENCRYPT_THEN_MAC) && !defined(WOLFSSL_AEAD_ONLY)
2269022713
&& !ssl->options.startedETMRead

tests/api/test_tls13.c

Lines changed: 222 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2339,7 +2339,6 @@ static int MERecv(WOLFSSL* ssl, char* buf, int sz, void* ctx)
23392339
int len = (int)msg->length;
23402340

23412341
(void)ssl;
2342-
(void)sz;
23432342

23442343
/* Pass back as much of message as will fit in buffer. */
23452344
if (len > sz)
@@ -2483,3 +2482,225 @@ int test_tls13_ks_missing(void)
24832482
#endif
24842483
return EXPECT_RESULT();
24852484
}
2485+
2486+
2487+
#if defined(WOLFSSL_TLS13) && !defined(NO_RSA) && defined(HAVE_ECC) && \
2488+
defined(HAVE_AESGCM) && !defined(NO_WOLFSSL_SERVER)
2489+
/* Called when writing. */
2490+
static int Tls13PTASend(WOLFSSL* ssl, char* buf, int sz, void* ctx)
2491+
{
2492+
(void)ssl;
2493+
(void)buf;
2494+
(void)ctx;
2495+
2496+
return sz;
2497+
}
2498+
/* Called when reading. */
2499+
static int Tls13PTARecv(WOLFSSL* ssl, char* buf, int sz, void* ctx)
2500+
{
2501+
WOLFSSL_BUFFER_INFO* msg = (WOLFSSL_BUFFER_INFO*)ctx;
2502+
int len;
2503+
2504+
(void)ssl;
2505+
2506+
if (msg->length == 0) {
2507+
/* Only do as many alerts as required to get to max alert count. */
2508+
msg->buffer[0]--;
2509+
if (msg->buffer[0] > 0) {
2510+
msg->buffer -= 7;
2511+
msg->length += 7;
2512+
}
2513+
else {
2514+
return -1;
2515+
}
2516+
}
2517+
2518+
len = (int)msg->length;
2519+
/* Pass back as much of message as will fit in buffer. */
2520+
if (len > sz)
2521+
len = sz;
2522+
XMEMCPY(buf, msg->buffer, len);
2523+
/* Move over returned data. */
2524+
msg->buffer += len;
2525+
msg->length -= len;
2526+
2527+
/* Amount actually copied. */
2528+
return len;
2529+
}
2530+
#endif
2531+
2532+
int test_tls13_plaintext_alert(void)
2533+
{
2534+
EXPECT_DECLS;
2535+
2536+
#if defined(WOLFSSL_TLS13) && !defined(NO_RSA) && defined(HAVE_ECC) && \
2537+
defined(HAVE_AESGCM) && !defined(NO_WOLFSSL_SERVER)
2538+
byte clientMsgs[] = {
2539+
/* Client Hello */
2540+
0x16, 0x03, 0x03, 0x01, 0x9b, 0x01, 0x00, 0x01,
2541+
0x97, 0x03, 0x03, 0xf4, 0x65, 0xbd, 0x22, 0xfe,
2542+
0x6e, 0xab, 0x66, 0xdd, 0xcf, 0xe9, 0x65, 0x55,
2543+
0xe8, 0xdf, 0xc3, 0x8e, 0x4b, 0x00, 0xbc, 0xf8,
2544+
0x23, 0x57, 0x1b, 0xa0, 0xc8, 0xa9, 0xe2, 0x8c,
2545+
0x91, 0x6e, 0xf9, 0x20, 0xf7, 0x5c, 0xc5, 0x5b,
2546+
0x75, 0x8c, 0x47, 0x0a, 0x0e, 0xc4, 0x1a, 0xda,
2547+
0xef, 0x75, 0xe5, 0x21, 0x00, 0x00, 0x00, 0x00,
2548+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
2549+
0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x13, 0x01,
2550+
0x13, 0x02, 0x01, 0x00, 0x01, 0x4a, 0x00, 0x2d,
2551+
0x00, 0x03, 0x02, 0x00, 0x01, 0x00, 0x33, 0x00,
2552+
0x47, 0x00, 0x45, 0x00, 0x17, 0x00, 0x41, 0x04,
2553+
0x90, 0xfc, 0xe2, 0x97, 0x05, 0x7c, 0xb5, 0x23,
2554+
0x5d, 0x5f, 0x5b, 0xcd, 0x0c, 0x1e, 0xe0, 0xe9,
2555+
0xab, 0x38, 0x6b, 0x1e, 0x20, 0x5c, 0x1c, 0x90,
2556+
0x2a, 0x9e, 0x68, 0x8e, 0x70, 0x05, 0x10, 0xa8,
2557+
0x02, 0x1b, 0xf9, 0x5c, 0xef, 0xc9, 0xaf, 0xca,
2558+
0x1a, 0x3b, 0x16, 0x8b, 0xe4, 0x1b, 0x3c, 0x15,
2559+
0xb8, 0x0d, 0xbd, 0xaf, 0x62, 0x8d, 0xa7, 0x13,
2560+
0xa0, 0x7c, 0xe0, 0x59, 0x0c, 0x4f, 0x8a, 0x6d,
2561+
0x00, 0x2b, 0x00, 0x03, 0x02, 0x03, 0x04, 0x00,
2562+
0x0d, 0x00, 0x20, 0x00, 0x1e, 0x06, 0x03, 0x05,
2563+
0x03, 0x04, 0x03, 0x02, 0x03, 0x08, 0x06, 0x08,
2564+
0x0b, 0x08, 0x05, 0x08, 0x0a, 0x08, 0x04, 0x08,
2565+
0x09, 0x06, 0x01, 0x05, 0x01, 0x04, 0x01, 0x03,
2566+
0x01, 0x02, 0x01, 0x00, 0x0a, 0x00, 0x04, 0x00,
2567+
0x02, 0x00, 0x17, 0x00, 0x16, 0x00, 0x00, 0x00,
2568+
0x23, 0x00, 0x00, 0x00, 0x29, 0x00, 0xb9, 0x00,
2569+
0x94, 0x00, 0x8e, 0x0f, 0x12, 0xfa, 0x84, 0x1f,
2570+
0x76, 0x94, 0xd7, 0x09, 0x5e, 0xad, 0x08, 0x51,
2571+
0xb6, 0x80, 0x28, 0x31, 0x8b, 0xfd, 0xc6, 0xbd,
2572+
0x9e, 0xf5, 0x3b, 0x4d, 0x02, 0xbe, 0x1d, 0x73,
2573+
0xea, 0x13, 0x68, 0x00, 0x4c, 0xfd, 0x3d, 0x48,
2574+
0x51, 0xf9, 0x06, 0xbb, 0x92, 0xed, 0x42, 0x9f,
2575+
0x7f, 0x2c, 0x73, 0x9f, 0xd9, 0xb4, 0xef, 0x05,
2576+
0x26, 0x5b, 0x60, 0x5c, 0x0a, 0xfc, 0xa3, 0xbd,
2577+
0x2d, 0x2d, 0x8b, 0xf9, 0xaa, 0x5c, 0x96, 0x3a,
2578+
0xf2, 0xec, 0xfa, 0xe5, 0x57, 0x2e, 0x87, 0xbe,
2579+
0x27, 0xc5, 0x3d, 0x4f, 0x5d, 0xdd, 0xde, 0x1c,
2580+
0x1b, 0xb3, 0xcc, 0x27, 0x27, 0x57, 0x5a, 0xd9,
2581+
0xea, 0x99, 0x27, 0x23, 0xa6, 0x0e, 0xea, 0x9c,
2582+
0x0d, 0x85, 0xcb, 0x72, 0xeb, 0xd7, 0x93, 0xe3,
2583+
0xfe, 0xf7, 0x5c, 0xc5, 0x5b, 0x75, 0x8c, 0x47,
2584+
0x0a, 0x0e, 0xc4, 0x1a, 0xda, 0xef, 0x75, 0xe5,
2585+
0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
2586+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
2587+
0x00, 0xfb, 0x92, 0xce, 0xaa, 0x00, 0x21, 0x20,
2588+
0xcb, 0x73, 0x25, 0x80, 0x46, 0x78, 0x4f, 0xe5,
2589+
0x34, 0xf6, 0x91, 0x13, 0x7f, 0xc8, 0x8d, 0xdc,
2590+
0x81, 0x04, 0xb7, 0x0d, 0x49, 0x85, 0x2e, 0x12,
2591+
0x7a, 0x07, 0x23, 0xe9, 0x13, 0xa4, 0x6d, 0x8c,
2592+
0x15, 0x03, 0x03, 0x00, 0x02, 0x01, 0x00, 0x00
2593+
};
2594+
2595+
WOLFSSL_CTX* ctx = NULL;
2596+
WOLFSSL* ssl = NULL;
2597+
WOLFSSL_BUFFER_INFO msg;
2598+
2599+
#ifdef WOLFSSL_TLS13_IGNORE_PT_ALERT_ON_ENC
2600+
/* We fail on WOLFSSL_ALERT_COUNT_MAX alerts. */
2601+
2602+
/* Set up wolfSSL context. */
2603+
ExpectNotNull(ctx = wolfSSL_CTX_new(wolfTLSv1_3_server_method()));
2604+
ExpectTrue(wolfSSL_CTX_use_certificate_file(ctx, svrCertFile,
2605+
CERT_FILETYPE));
2606+
ExpectTrue(wolfSSL_CTX_use_PrivateKey_file(ctx, svrKeyFile,
2607+
CERT_FILETYPE));
2608+
if (EXPECT_SUCCESS()) {
2609+
wolfSSL_CTX_set_verify(ctx, WOLFSSL_VERIFY_NONE, NULL);
2610+
}
2611+
/* Read from 'msg'. */
2612+
wolfSSL_SetIORecv(ctx, Tls13PTARecv);
2613+
/* No where to send to - dummy sender. */
2614+
wolfSSL_SetIOSend(ctx, Tls13PTASend);
2615+
2616+
ExpectNotNull(ssl = wolfSSL_new(ctx));
2617+
msg.buffer = clientMsgs;
2618+
msg.length = (unsigned int)sizeof(clientMsgs) - 1;
2619+
clientMsgs[sizeof(clientMsgs) - 1] = WOLFSSL_ALERT_COUNT_MAX;
2620+
if (EXPECT_SUCCESS()) {
2621+
wolfSSL_SetIOReadCtx(ssl, &msg);
2622+
}
2623+
/* Alert will be ignored until too many. */
2624+
/* Read all message include CertificateVerify with invalid signature
2625+
* algorithm. */
2626+
ExpectIntEQ(wolfSSL_accept(ssl), WC_NO_ERR_TRACE(WOLFSSL_FATAL_ERROR));
2627+
/* Expect an invalid parameter error. */
2628+
ExpectIntEQ(wolfSSL_get_error(ssl, WOLFSSL_FATAL_ERROR),
2629+
WC_NO_ERR_TRACE(ALERT_COUNT_E));
2630+
2631+
wolfSSL_free(ssl);
2632+
ssl = NULL;
2633+
wolfSSL_CTX_free(ctx);
2634+
ctx = NULL;
2635+
2636+
/* Set up wolfSSL context. */
2637+
ExpectNotNull(ctx = wolfSSL_CTX_new(wolfTLSv1_3_server_method()));
2638+
ExpectTrue(wolfSSL_CTX_use_certificate_file(ctx, svrCertFile,
2639+
CERT_FILETYPE));
2640+
ExpectTrue(wolfSSL_CTX_use_PrivateKey_file(ctx, svrKeyFile,
2641+
CERT_FILETYPE));
2642+
if (EXPECT_SUCCESS()) {
2643+
wolfSSL_CTX_set_verify(ctx, WOLFSSL_VERIFY_NONE, NULL);
2644+
}
2645+
/* Read from 'msg'. */
2646+
wolfSSL_SetIORecv(ctx, Tls13PTARecv);
2647+
/* No where to send to - dummy sender. */
2648+
wolfSSL_SetIOSend(ctx, Tls13PTASend);
2649+
2650+
ExpectNotNull(ssl = wolfSSL_new(ctx));
2651+
msg.buffer = clientMsgs;
2652+
msg.length = (unsigned int)sizeof(clientMsgs) - 1;
2653+
clientMsgs[sizeof(clientMsgs) - 1] = WOLFSSL_ALERT_COUNT_MAX - 1;
2654+
if (EXPECT_SUCCESS()) {
2655+
wolfSSL_SetIOReadCtx(ssl, &msg);
2656+
}
2657+
/* Alert will be ignored until too many. */
2658+
/* Read all message include CertificateVerify with invalid signature
2659+
* algorithm. */
2660+
ExpectIntEQ(wolfSSL_accept(ssl), WC_NO_ERR_TRACE(WOLFSSL_FATAL_ERROR));
2661+
/* Expect an invalid parameter error. */
2662+
ExpectIntEQ(wolfSSL_get_error(ssl, WOLFSSL_FATAL_ERROR),
2663+
WC_NO_ERR_TRACE(SOCKET_ERROR_E));
2664+
2665+
wolfSSL_free(ssl);
2666+
wolfSSL_CTX_free(ctx);
2667+
#else
2668+
/* Fail on plaintext alert when encryption keys on. */
2669+
2670+
/* Set up wolfSSL context. */
2671+
ExpectNotNull(ctx = wolfSSL_CTX_new(wolfTLSv1_3_server_method()));
2672+
ExpectTrue(wolfSSL_CTX_use_certificate_file(ctx, svrCertFile,
2673+
CERT_FILETYPE));
2674+
ExpectTrue(wolfSSL_CTX_use_PrivateKey_file(ctx, svrKeyFile,
2675+
CERT_FILETYPE));
2676+
if (EXPECT_SUCCESS()) {
2677+
wolfSSL_CTX_set_verify(ctx, WOLFSSL_VERIFY_NONE, NULL);
2678+
}
2679+
/* Read from 'msg'. */
2680+
wolfSSL_SetIORecv(ctx, Tls13PTARecv);
2681+
/* No where to send to - dummy sender. */
2682+
wolfSSL_SetIOSend(ctx, Tls13PTASend);
2683+
2684+
ExpectNotNull(ssl = wolfSSL_new(ctx));
2685+
msg.buffer = clientMsgs;
2686+
msg.length = (unsigned int)sizeof(clientMsgs) - 1;
2687+
clientMsgs[sizeof(clientMsgs) - 1] = 1;
2688+
if (EXPECT_SUCCESS()) {
2689+
wolfSSL_SetIOReadCtx(ssl, &msg);
2690+
}
2691+
/* Alert will be ignored until too many. */
2692+
/* Read all message include CertificateVerify with invalid signature
2693+
* algorithm. */
2694+
ExpectIntEQ(wolfSSL_accept(ssl), WC_NO_ERR_TRACE(WOLFSSL_FATAL_ERROR));
2695+
/* Expect an invalid parameter error. */
2696+
ExpectIntEQ(wolfSSL_get_error(ssl, WOLFSSL_FATAL_ERROR),
2697+
WC_NO_ERR_TRACE(PARSE_ERROR));
2698+
2699+
wolfSSL_free(ssl);
2700+
wolfSSL_CTX_free(ctx);
2701+
#endif
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#endif
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return EXPECT_RESULT();
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}
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