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Merge pull request #6929 from julek-wolfssl/dtls13-early-data-server-side 

dtls 1.3: allow to skip cookie exchange on resumption
This commit is contained in:
JacobBarthelmeh 2023-11-06 13:30:21 -07:00 committed by GitHub
parent 8ac291bbe1 8c87920903
commit c5e2f414ea
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 188 additions and 75 deletions
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9
.github/workflows/os-check.yml vendored
View File

@ -16,11 +16,14 @@ jobs:
'--enable-all --enable-asn=original',
'--enable-harden-tls',
'--enable-tls13 --enable-session-ticket --enable-dtls --enable-dtls13
--enable-opensslextra --enable-sessioncerts
CPPFLAGS=''-DWOLFSSL_DTLS_NO_HVR_ON_RESUME -DHAVE_EXT_CACHE
-DWOLFSSL_TICKET_HAVE_ID -DHAVE_EX_DATA -DSESSION_CACHE_DYNAMIC_MEM'' ',
--enable-opensslextra --enable-sessioncerts
CPPFLAGS=''-DWOLFSSL_DTLS_NO_HVR_ON_RESUME -DHAVE_EXT_CACHE
-DWOLFSSL_TICKET_HAVE_ID -DHAVE_EX_DATA -DSESSION_CACHE_DYNAMIC_MEM'' ',
'--enable-all --enable-secure-renegotiation',
'--enable-all --enable-haproxy --enable-quic',
'--enable-dtls --enable-dtls13 --enable-earlydata
--enable-session-ticket --enable-psk
CPPFLAGS=''-DWOLFSSL_DTLS13_NO_HRR_ON_RESUME'' ',
]
name: make check
runs-on: ${{ matrix.os }}

20
examples/client/client.c
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@ -466,26 +466,6 @@ static void EarlyData(WOLFSSL_CTX* ctx, WOLFSSL* ssl, const char* msg,
wolfSSL_CTX_free(ctx); ctx = NULL;
err_sys("SSL_write_early_data failed");
}
do {
err = 0; /* reset error */
ret = wolfSSL_write_early_data(ssl, msg, msgSz, &msgSz);
if (ret <= 0) {
err = wolfSSL_get_error(ssl, 0);
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {
ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
if (ret < 0) break;
}
#endif
}
} while (err == WC_PENDING_E);
if (ret != msgSz) {
LOG_ERROR("SSL_write_early_data msg error %d, %s\n", err,
wolfSSL_ERR_error_string(err, buffer));
wolfSSL_free(ssl);
wolfSSL_CTX_free(ctx);
err_sys("SSL_write_early_data failed");
}
}
#endif

2
examples/server/server.c
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@ -3358,7 +3358,7 @@ THREAD_RETURN WOLFSSL_THREAD server_test(void* args)
err = 0; /* reset error */
ret = wolfSSL_read_early_data(ssl, input, sizeof(input)-1,
&len);
if (ret != WOLFSSL_SUCCESS) {
if (ret <= 0) {
err = SSL_get_error(ssl, 0);
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {

21
src/dtls.c
View File

@ -21,11 +21,13 @@
/*
* WOLFSSL_DTLS_NO_HVR_ON_RESUME
* WOLFSSL_DTLS13_NO_HRR_ON_RESUME
* If defined, a DTLS server will not do a cookie exchange on successful
* client resumption: the resumption will be faster (one RTT less) and
* will consume less bandwidth (one ClientHello and one HelloVerifyRequest
* less). On the other hand, if a valid SessionID is collected, forged
* clientHello messages will consume resources on the server.
* will consume less bandwidth (one ClientHello and one
* HelloVerifyRequest/HelloRetryRequest less). On the other hand, if a valid
* SessionID/ticket/psk is collected, forged clientHello messages will
* consume resources on the server.
* WOLFSSL_DTLS_CH_FRAG
* Allow a server to process a fragmented second/verified (one containing a
* valid cookie response) ClientHello message. The first/unverified (one
@ -769,6 +771,15 @@ static int SendStatelessReplyDtls13(const WOLFSSL* ssl, WolfSSL_CH* ch)
}
}
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
if (ssl->options.dtls13NoHrrOnResume && usePSK && pskInfo.isValid &&
!cs.doHelloRetry) {
/* Skip HRR on resumption */
((WOLFSSL*)ssl)->options.dtlsStateful = 1;
goto dtls13_cleanup;
}
#endif
#ifdef HAVE_SUPPORTED_CURVES
if (cs.doHelloRetry) {
ret = TLSX_KeyShare_SetSupported(ssl, &parsedExts);
@ -949,7 +960,7 @@ int DoClientHelloStateless(WOLFSSL* ssl, const byte* input, word32 helloSz,
ret = COOKIE_ERROR;
else
#endif
ret = SendStatelessReply((WOLFSSL*)ssl, &ch, isTls13);
ret = SendStatelessReply(ssl, &ch, isTls13);
}
else {
byte cookieGood;
@ -970,7 +981,7 @@ int DoClientHelloStateless(WOLFSSL* ssl, const byte* input, word32 helloSz,
ret = COOKIE_ERROR;
else
#endif
ret = SendStatelessReply((WOLFSSL*)ssl, &ch, isTls13);
ret = SendStatelessReply(ssl, &ch, isTls13);
}
else {
ssl->options.dtlsStateful = 1;

10
src/dtls13.c
View File

@ -2844,5 +2844,15 @@ int wolfSSL_dtls13_allow_ch_frag(WOLFSSL *ssl, int enabled)
}
#endif
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
int wolfSSL_dtls13_no_hrr_on_resume(WOLFSSL *ssl, int enabled)
{
if (ssl->options.side == WOLFSSL_CLIENT_END) {
return WOLFSSL_FAILURE;
}
ssl->options.dtls13NoHrrOnResume = !!enabled;
return WOLFSSL_SUCCESS;
}
#endif
#endif /* WOLFSSL_DTLS13 */

19
src/internal.c
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@ -20185,20 +20185,8 @@ static int DtlsShouldDrop(WOLFSSL* ssl, int retcode)
#ifndef NO_WOLFSSL_SERVER
if (ssl->options.side == WOLFSSL_SERVER_END
&& ssl->curRL.type != handshake && !IsSCR(ssl)) {
int beforeCookieVerified = 0;
if (!IsAtLeastTLSv1_3(ssl->version)) {
beforeCookieVerified =
ssl->options.acceptState < ACCEPT_FIRST_REPLY_DONE;
}
#ifdef WOLFSSL_DTLS13
else {
beforeCookieVerified =
ssl->options.acceptState < TLS13_ACCEPT_SECOND_REPLY_DONE;
}
#endif /* WOLFSSL_DTLS13 */
if (beforeCookieVerified) {
WOLFSSL_MSG("Drop non-handshake record before handshake");
if (!ssl->options.dtlsStateful) {
WOLFSSL_MSG("Drop non-handshake record when not stateful");
return 1;
}
}
@ -34441,6 +34429,9 @@ static int DoSessionTicket(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
#if defined(WOLFSSL_TLS13) && defined(HAVE_SUPPORTED_CURVES)
if (cs.doHelloRetry) {
/* Make sure we don't send HRR twice */
if (ssl->options.serverState == SERVER_HELLO_RETRY_REQUEST_COMPLETE)
return INVALID_PARAMETER;
ssl->options.serverState = SERVER_HELLO_RETRY_REQUEST_COMPLETE;
return TLSX_KeyShare_SetSupported(ssl, &ssl->extensions);
}

11
src/ssl.c
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@ -16793,11 +16793,13 @@ cleanup:
#endif /* OPENSSL_EXTRA || WOLFSSL_EXTRA || WOLFSSL_WPAS_SMALL */
/* return true if connection established */
int wolfSSL_is_init_finished(WOLFSSL* ssl)
int wolfSSL_is_init_finished(const WOLFSSL* ssl)
{
if (ssl == NULL)
return 0;
/* Can't use ssl->options.connectState and ssl->options.acceptState because
* they differ in meaning for TLS <=1.2 and 1.3 */
if (ssl->options.handShakeState == HANDSHAKE_DONE)
return 1;
@ -31970,12 +31972,7 @@ int wolfSSL_SSL_in_init(WOLFSSL *ssl)
{
WOLFSSL_ENTER("wolfSSL_SSL_in_init");
if (ssl == NULL)
return WOLFSSL_FAILURE;
/* Can't use ssl->options.connectState and ssl->options.acceptState because
* they differ in meaning for TLS <=1.2 and 1.3 */
return ssl->options.handShakeState != HANDSHAKE_DONE;
return !wolfSSL_is_init_finished(ssl);
}
int wolfSSL_SSL_in_connect_init(WOLFSSL* ssl)

78
src/tls13.c
View File

@ -6204,6 +6204,8 @@ static int CheckPreSharedKeys(WOLFSSL* ssl, const byte* input, word32 helloSz,
if ((ret = SetKeysSide(ssl, DECRYPT_SIDE_ONLY)) != 0)
return ret;
ssl->keys.encryptionOn = 1;
#ifdef WOLFSSL_DTLS13
if (ssl->options.dtls) {
ret = Dtls13NewEpoch(ssl,
@ -6916,7 +6918,11 @@ int DoTls13ClientHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
}
}
else {
ERROR_OUT(HRR_COOKIE_ERROR, exit_dch);
#if defined(WOLFSSL_DTLS13) && defined(WOLFSSL_DTLS13_NO_HRR_ON_RESUME)
/* Don't error out as we may be resuming. We confirm this later. */
if (!ssl->options.dtls)
#endif
ERROR_OUT(HRR_COOKIE_ERROR, exit_dch);
}
}
#endif
@ -6982,7 +6988,6 @@ int DoTls13ClientHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
goto exit_dch;
}
}
else
#endif
#ifdef HAVE_SUPPORTED_CURVES
if (args->usingPSK == 2) {
@ -6990,6 +6995,9 @@ int DoTls13ClientHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
int doHelloRetry = 0;
ret = TLSX_KeyShare_Establish(ssl, &doHelloRetry);
if (doHelloRetry) {
/* Make sure we don't send HRR twice */
if (ssl->options.serverState == SERVER_HELLO_RETRY_REQUEST_COMPLETE)
ERROR_OUT(INVALID_PARAMETER, exit_dch);
ssl->options.serverState = SERVER_HELLO_RETRY_REQUEST_COMPLETE;
if (ret != WC_PENDING_E)
ret = 0; /* for hello_retry return 0 */
@ -7082,32 +7090,58 @@ int DoTls13ClientHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
ret = INPUT_CASE_ERROR;
} /* switch (ssl->options.asyncState) */
#if defined(WOLFSSL_SEND_HRR_COOKIE)
if (ret == 0 && ssl->options.sendCookie && ssl->options.cookieGood &&
(ssl->options.serverState == SERVER_HELLO_RETRY_REQUEST_COMPLETE
#ifdef WOLFSSL_DTLS13
/* DTLS cookie exchange should be done in stateless code in
* DoClientHelloStateless. If we verified the cookie then
* always advance the state. */
|| ssl->options.dtls
#endif
))
ssl->options.serverState = SERVER_HELLO_COMPLETE;
#endif
#ifdef WOLFSSL_SEND_HRR_COOKIE
if (ret == 0 && ssl->options.sendCookie) {
if (ssl->options.cookieGood &&
ssl->options.acceptState == TLS13_ACCEPT_FIRST_REPLY_DONE) {
/* Processing second ClientHello. Clear HRR state. */
ssl->options.serverState = NULL_STATE;
}
#if defined(WOLFSSL_DTLS13) && defined(WOLFSSL_SEND_HRR_COOKIE)
if (ret == 0 && ssl->options.dtls && ssl->options.sendCookie &&
ssl->options.serverState <= SERVER_HELLO_RETRY_REQUEST_COMPLETE) {
/* Cookie and key share negotiation should be handled in
* DoClientHelloStateless. If we enter here then something went wrong
* in our logic. */
ERROR_OUT(BAD_HELLO, exit_dch);
if (ssl->options.cookieGood &&
ssl->options.serverState == SERVER_HELLO_RETRY_REQUEST_COMPLETE) {
/* If we already verified the peer with a cookie then we can't
* do another HRR for cipher negotiation. Send alert and restart
* the entire handshake. */
ERROR_OUT(INVALID_PARAMETER, exit_dch);
}
#ifdef WOLFSSL_DTLS13
if (ssl->options.dtls &&
ssl->options.serverState == SERVER_HELLO_RETRY_REQUEST_COMPLETE) {
/* Cookie and key share negotiation should be handled in
* DoClientHelloStateless. If we enter here then something went
* wrong in our logic. */
ERROR_OUT(BAD_HELLO, exit_dch);
}
#endif
/* Send a cookie */
if (!ssl->options.cookieGood &&
ssl->options.serverState != SERVER_HELLO_RETRY_REQUEST_COMPLETE) {
#ifdef WOLFSSL_DTLS13
if (ssl->options.dtls) {
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
/* We can skip cookie on resumption */
if (!ssl->options.dtls || !ssl->options.dtls13NoHrrOnResume ||
!args->usingPSK)
#endif
ERROR_OUT(BAD_HELLO, exit_dch);
}
else
#endif
{
/* Need to remove the keyshare ext if we found a common group
* and are not doing curve negotiation. */
TLSX_Remove(&ssl->extensions, TLSX_KEY_SHARE, ssl->heap);
ssl->options.serverState = SERVER_HELLO_RETRY_REQUEST_COMPLETE;
}
}
}
#endif /* WOLFSSL_DTLS13 */
#ifdef WOLFSSL_DTLS_CID
/* do not modify CID state if we are sending an HRR */
if (ssl->options.useDtlsCID &&
if (ret == 0 && ssl->options.dtls && ssl->options.useDtlsCID &&
ssl->options.serverState != SERVER_HELLO_RETRY_REQUEST_COMPLETE)
DtlsCIDOnExtensionsParsed(ssl);
#endif /* WOLFSSL_DTLS_CID */

85
tests/api.c
View File

@ -67135,7 +67135,7 @@ static int test_dtls_empty_keyshare_with_cookie(void)
return EXPECT_RESULT();
}
#if defined(HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES) && defined(WOLFSSL_TLS13) && \
#if defined(HAVE_IO_TESTS_DEPENDENCIES) && defined(WOLFSSL_TLS13) && \
defined(HAVE_LIBOQS)
static void test_tls13_pq_groups_ctx_ready(WOLFSSL_CTX* ctx)
{
@ -67152,7 +67152,7 @@ static void test_tls13_pq_groups_on_result(WOLFSSL* ssl)
static int test_tls13_pq_groups(void)
{
EXPECT_DECLS;
#if defined(HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES) && defined(WOLFSSL_TLS13) && \
#if defined(HAVE_IO_TESTS_DEPENDENCIES) && defined(WOLFSSL_TLS13) && \
defined(HAVE_LIBOQS)
callback_functions func_cb_client;
callback_functions func_cb_server;
@ -67174,6 +67174,86 @@ static int test_tls13_pq_groups(void)
return EXPECT_RESULT();
}
static int test_dtls13_early_data(void)
{
EXPECT_DECLS;
#if defined(HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES) && defined(WOLFSSL_DTLS13) && \
defined(WOLFSSL_EARLY_DATA) && defined(HAVE_SESSION_TICKET)
struct test_memio_ctx test_ctx;
WOLFSSL_CTX *ctx_c = NULL, *ctx_s = NULL;
WOLFSSL *ssl_c = NULL, *ssl_s = NULL;
WOLFSSL_SESSION *sess = NULL;
int written = 0;
int read = 0;
char msg[] = "This is early data";
char msg2[] = "This is client data";
char msg3[] = "This is server data";
char msgBuf[50];
XMEMSET(&test_ctx, 0, sizeof(test_ctx));
ExpectIntEQ(test_memio_setup(&test_ctx, &ctx_c, &ctx_s, &ssl_c, &ssl_s,
wolfDTLSv1_3_client_method, wolfDTLSv1_3_server_method), 0);
/* Get a ticket so that we can do 0-RTT on the next connection */
ExpectIntEQ(test_memio_do_handshake(ssl_c, ssl_s, 10, NULL), 0);
ExpectNotNull(sess = wolfSSL_get1_session(ssl_c));
wolfSSL_free(ssl_c);
ssl_c = NULL;
wolfSSL_free(ssl_s);
ssl_s = NULL;
XMEMSET(&test_ctx, 0, sizeof(test_ctx));
ExpectIntEQ(test_memio_setup(&test_ctx, &ctx_c, &ctx_s, &ssl_c, &ssl_s,
wolfDTLSv1_3_client_method, wolfDTLSv1_3_server_method), 0);
ExpectIntEQ(wolfSSL_set_session(ssl_c, sess), WOLFSSL_SUCCESS);
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
ExpectIntEQ(wolfSSL_dtls13_no_hrr_on_resume(ssl_s, 1), WOLFSSL_SUCCESS);
#else
/* Let's test this but we generally don't recommend turning off the
* cookie exchange */
ExpectIntEQ(wolfSSL_disable_hrr_cookie(ssl_s), WOLFSSL_SUCCESS);
#endif
ExpectIntEQ(wolfSSL_write_early_data(ssl_c, msg, sizeof(msg),
&written), sizeof(msg));
ExpectIntEQ(written, sizeof(msg));
ExpectIntEQ(wolfSSL_read_early_data(ssl_s, msgBuf, sizeof(msgBuf),
&read), sizeof(msg));
ExpectIntEQ(read, sizeof(msg));
ExpectStrEQ(msg, msgBuf);
/* Complete handshake */
ExpectIntEQ(wolfSSL_connect(ssl_c), -1);
ExpectIntEQ(wolfSSL_get_error(ssl_c, -1), WOLFSSL_ERROR_WANT_READ);
/* Use wolfSSL_is_init_finished to check if handshake is complete. Normally
* a user would loop until it is true but here we control both sides so we
* just assert the expected value. wolfSSL_read_early_data does not provide
* handshake status to us with non-blocking IO and we can't use
* wolfSSL_accept as TLS layer may return ZERO_RETURN due to early data
* parsing logic. */
ExpectFalse(wolfSSL_is_init_finished(ssl_s));
ExpectIntEQ(wolfSSL_read_early_data(ssl_s, msgBuf, sizeof(msgBuf),
&read), WOLFSSL_FAILURE);
ExpectTrue(wolfSSL_is_init_finished(ssl_s));
ExpectIntEQ(wolfSSL_connect(ssl_c), WOLFSSL_SUCCESS);
/* Test bi-directional write */
ExpectIntEQ(wolfSSL_write(ssl_c, msg2, sizeof(msg2)), sizeof(msg2));
ExpectIntEQ(wolfSSL_read(ssl_s, msgBuf, sizeof(msgBuf)), sizeof(msg2));
ExpectStrEQ(msg2, msgBuf);
ExpectIntEQ(wolfSSL_write(ssl_s, msg3, sizeof(msg3)), sizeof(msg3));
ExpectIntEQ(wolfSSL_read(ssl_c, msgBuf, sizeof(msgBuf)), sizeof(msg3));
ExpectStrEQ(msg3, msgBuf);
ExpectTrue(wolfSSL_session_reused(ssl_c));
ExpectTrue(wolfSSL_session_reused(ssl_s));
#endif
return EXPECT_RESULT();
}
/*----------------------------------------------------------------------------*
| Main
*----------------------------------------------------------------------------*/
@ -68456,6 +68536,7 @@ TEST_CASE testCases[] = {
TEST_DECL(test_dtls13_frag_ch_pq),
TEST_DECL(test_dtls_empty_keyshare_with_cookie),
TEST_DECL(test_tls13_pq_groups),
TEST_DECL(test_dtls13_early_data),
/* This test needs to stay at the end to clean up any caches allocated. */
TEST_DECL(test_wolfSSL_Cleanup)
};

3
wolfssl/internal.h
View File

@ -4732,6 +4732,9 @@ struct Options {
#ifdef WOLFSSL_DTLS13
word16 dtls13SendMoreAcks:1; /* Send more acks during the
* handshake process */
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
word16 dtls13NoHrrOnResume:1;
#endif
#ifdef WOLFSSL_DTLS_CH_FRAG
word16 dtls13ChFrag:1;
#endif

5
wolfssl/ssl.h
View File

@ -1657,7 +1657,7 @@ WOLFSSL_API int wolfSSL_CTX_add_session(WOLFSSL_CTX* ctx,
WOLFSSL_SESSION* session);
WOLFSSL_API int wolfSSL_SESSION_set_cipher(WOLFSSL_SESSION* session,
const WOLFSSL_CIPHER* cipher);
WOLFSSL_API int wolfSSL_is_init_finished(WOLFSSL* ssl);
WOLFSSL_API int wolfSSL_is_init_finished(const WOLFSSL* ssl);
WOLFSSL_API const char* wolfSSL_get_version(const WOLFSSL* ssl);
WOLFSSL_API int wolfSSL_get_current_cipher_suite(WOLFSSL* ssl);
@ -5227,6 +5227,9 @@ WOLFSSL_API int wolfSSL_dtls_cid_get_tx(WOLFSSL* ssl, unsigned char* buffer,
#ifdef WOLFSSL_DTLS_CH_FRAG
WOLFSSL_API int wolfSSL_dtls13_allow_ch_frag(WOLFSSL *ssl, int enabled);
#endif
#ifdef WOLFSSL_DTLS13_NO_HRR_ON_RESUME
WOLFSSL_API int wolfSSL_dtls13_no_hrr_on_resume(WOLFSSL *ssl, int enabled);
#endif
/* */
#define SSL2_VERSION 0x0002