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openssl/test/tls13ccstest.c

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/*
* Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/ssl.h>
#include <string.h>
#include "helpers/ssltestlib.h"
#include "testutil.h"
#include "internal/packet.h"
static char *cert = NULL;
static char *privkey = NULL;
static BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
static int chseen = 0, shseen = 0, sccsseen = 0, ccsaftersh = 0;
static int ccsbeforesh = 0, sappdataseen = 0, cappdataseen = 0, badccs = 0;
static int badvers = 0, badsessid = 0;
static unsigned char chsessid[SSL_MAX_SSL_SESSION_ID_LENGTH];
static size_t chsessidlen = 0;
static int watchccs_new(BIO *bi);
static int watchccs_free(BIO *a);
static int watchccs_read(BIO *b, char *out, int outl);
static int watchccs_write(BIO *b, const char *in, int inl);
static long watchccs_ctrl(BIO *b, int cmd, long num, void *ptr);
static int watchccs_gets(BIO *bp, char *buf, int size);
static int watchccs_puts(BIO *bp, const char *str);
/* Choose a sufficiently large type likely to be unused for this custom BIO */
# define BIO_TYPE_WATCHCCS_FILTER (0x80 | BIO_TYPE_FILTER)
static BIO_METHOD *method_watchccs = NULL;
static const BIO_METHOD *bio_f_watchccs_filter(void)
{
if (method_watchccs == NULL) {
method_watchccs = BIO_meth_new(BIO_TYPE_WATCHCCS_FILTER,
"Watch CCS filter");
if (method_watchccs == NULL
|| !BIO_meth_set_write(method_watchccs, watchccs_write)
|| !BIO_meth_set_read(method_watchccs, watchccs_read)
|| !BIO_meth_set_puts(method_watchccs, watchccs_puts)
|| !BIO_meth_set_gets(method_watchccs, watchccs_gets)
|| !BIO_meth_set_ctrl(method_watchccs, watchccs_ctrl)
|| !BIO_meth_set_create(method_watchccs, watchccs_new)
|| !BIO_meth_set_destroy(method_watchccs, watchccs_free))
return NULL;
}
return method_watchccs;
}
static int watchccs_new(BIO *bio)
{
BIO_set_init(bio, 1);
return 1;
}
static int watchccs_free(BIO *bio)
{
BIO_set_init(bio, 0);
return 1;
}
static int watchccs_read(BIO *bio, char *out, int outl)
{
int ret = 0;
BIO *next = BIO_next(bio);
if (outl <= 0)
return 0;
if (next == NULL)
return 0;
BIO_clear_retry_flags(bio);
ret = BIO_read(next, out, outl);
if (ret <= 0 && BIO_should_read(next))
BIO_set_retry_read(bio);
return ret;
}
static int watchccs_write(BIO *bio, const char *in, int inl)
{
int ret = 0;
BIO *next = BIO_next(bio);
PACKET pkt, msg, msgbody, sessionid;
unsigned int rectype, recvers, msgtype, expectedrecvers;
if (inl <= 0)
return 0;
if (next == NULL)
return 0;
BIO_clear_retry_flags(bio);
if (!PACKET_buf_init(&pkt, (const unsigned char *)in, inl))
return 0;
/* We assume that we always write complete records each time */
while (PACKET_remaining(&pkt)) {
if (!PACKET_get_1(&pkt, &rectype)
|| !PACKET_get_net_2(&pkt, &recvers)
|| !PACKET_get_length_prefixed_2(&pkt, &msg))
return 0;
expectedrecvers = TLS1_2_VERSION;
if (rectype == SSL3_RT_HANDSHAKE) {
if (!PACKET_get_1(&msg, &msgtype)
|| !PACKET_get_length_prefixed_3(&msg, &msgbody))
return 0;
if (msgtype == SSL3_MT_CLIENT_HELLO) {
chseen++;
/*
* Skip legacy_version (2 bytes) and Random (32 bytes) to read
* session_id.
*/
if (!PACKET_forward(&msgbody, 34)
|| !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
return 0;
if (chseen == 1) {
expectedrecvers = TLS1_VERSION;
/* Save the session id for later */
chsessidlen = PACKET_remaining(&sessionid);
if (!PACKET_copy_bytes(&sessionid, chsessid, chsessidlen))
return 0;
} else {
/*
* Check the session id for the second ClientHello is the
* same as the first one.
*/
if (PACKET_remaining(&sessionid) != chsessidlen
|| (chsessidlen > 0
&& memcmp(chsessid, PACKET_data(&sessionid),
chsessidlen) != 0))
badsessid = 1;
}
} else if (msgtype == SSL3_MT_SERVER_HELLO) {
shseen++;
/*
* Skip legacy_version (2 bytes) and Random (32 bytes) to read
* session_id.
*/
if (!PACKET_forward(&msgbody, 34)
|| !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
return 0;
/*
* Check the session id is the same as the one in the
* ClientHello
*/
if (PACKET_remaining(&sessionid) != chsessidlen
|| (chsessidlen > 0
&& memcmp(chsessid, PACKET_data(&sessionid),
chsessidlen) != 0))
badsessid = 1;
}
} else if (rectype == SSL3_RT_CHANGE_CIPHER_SPEC) {
if (bio == s_to_c_fbio) {
/*
* Server writing. We shouldn't have written any app data
* yet, and we should have seen both the ClientHello and the
* ServerHello
*/
if (!sappdataseen
&& chseen == 1
&& shseen == 1
&& !sccsseen)
sccsseen = 1;
else
badccs = 1;
} else if (!cappdataseen) {
/*
* Client writing. We shouldn't have written any app data
* yet, and we should have seen the ClientHello
*/
if (shseen == 1 && !ccsaftersh)
ccsaftersh = 1;
else if (shseen == 0 && !ccsbeforesh)
ccsbeforesh = 1;
else
badccs = 1;
} else {
badccs = 1;
}
} else if (rectype == SSL3_RT_APPLICATION_DATA) {
if (bio == s_to_c_fbio)
sappdataseen = 1;
else
cappdataseen = 1;
}
if (recvers != expectedrecvers)
badvers = 1;
}
ret = BIO_write(next, in, inl);
if (ret <= 0 && BIO_should_write(next))
BIO_set_retry_write(bio);
return ret;
}
static long watchccs_ctrl(BIO *bio, int cmd, long num, void *ptr)
{
long ret;
BIO *next = BIO_next(bio);
if (next == NULL)
return 0;
switch (cmd) {
case BIO_CTRL_DUP:
ret = 0;
break;
default:
ret = BIO_ctrl(next, cmd, num, ptr);
break;
}
return ret;
}
static int watchccs_gets(BIO *bio, char *buf, int size)
{
/* We don't support this - not needed anyway */
return -1;
}
static int watchccs_puts(BIO *bio, const char *str)
{
return watchccs_write(bio, str, strlen(str));
}
static int test_tls13ccs(int tst)
{
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *sssl = NULL, *cssl = NULL;
int ret = 0;
const char msg[] = "Dummy data";
char buf[80];
size_t written, readbytes;
SSL_SESSION *sess = NULL;
chseen = shseen = sccsseen = ccsaftersh = ccsbeforesh = 0;
sappdataseen = cappdataseen = badccs = badvers = badsessid = 0;
chsessidlen = 0;
if (!TEST_true(create_ssl_ctx_pair(NULL, TLS_server_method(),
TLS_client_method(), TLS1_VERSION, 0,
&sctx, &cctx, cert, privkey))
|| !TEST_true(SSL_CTX_set_max_early_data(sctx,
SSL3_RT_MAX_PLAIN_LENGTH)))
goto err;
/*
* Test 0: Simple Handshake
* Test 1: Simple Handshake, client middlebox compat mode disabled
* Test 2: Simple Handshake, server middlebox compat mode disabled
* Test 3: HRR Handshake
* Test 4: HRR Handshake, client middlebox compat mode disabled
* Test 5: HRR Handshake, server middlebox compat mode disabled
* Test 6: Early data handshake
* Test 7: Early data handshake, client middlebox compat mode disabled
* Test 8: Early data handshake, server middlebox compat mode disabled
* Test 9: Early data then HRR
* Test 10: Early data then HRR, client middlebox compat mode disabled
* Test 11: Early data then HRR, server middlebox compat mode disabled
*/
switch (tst) {
case 0:
case 3:
case 6:
case 9:
break;
case 1:
case 4:
case 7:
case 10:
SSL_CTX_clear_options(cctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
break;
case 2:
case 5:
case 8:
case 11:
SSL_CTX_clear_options(sctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
break;
default:
TEST_error("Invalid test value");
goto err;
}
if (tst >= 6) {
/* Get a session suitable for early_data */
if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, NULL, NULL))
|| !TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
goto err;
sess = SSL_get1_session(cssl);
if (!TEST_ptr(sess))
goto err;
SSL_shutdown(cssl);
SSL_shutdown(sssl);
SSL_free(sssl);
SSL_free(cssl);
sssl = cssl = NULL;
}
if ((tst >= 3 && tst <= 5) || tst >= 9) {
/* HRR handshake */
#if defined(OPENSSL_NO_EC)
# if !defined(OPENSSL_NO_DH)
if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "ffdhe3072")))
goto err;
# endif
#else
if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "P-256")))
goto err;
#endif
}
s_to_c_fbio = BIO_new(bio_f_watchccs_filter());
c_to_s_fbio = BIO_new(bio_f_watchccs_filter());
if (!TEST_ptr(s_to_c_fbio)
|| !TEST_ptr(c_to_s_fbio)) {
BIO_free(s_to_c_fbio);
BIO_free(c_to_s_fbio);
goto err;
}
/* BIOs get freed on error */
if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, s_to_c_fbio,
c_to_s_fbio)))
goto err;
if (tst >= 6) {
/* Early data */
if (!TEST_true(SSL_set_session(cssl, sess))
|| !TEST_true(SSL_write_early_data(cssl, msg, strlen(msg),
&written))
|| (tst <= 8
&& !TEST_int_eq(SSL_read_early_data(sssl, buf, sizeof(buf),
&readbytes),
SSL_READ_EARLY_DATA_SUCCESS)))
goto err;
if (tst <= 8) {
if (!TEST_int_gt(SSL_connect(cssl), 0))
goto err;
} else {
if (!TEST_int_le(SSL_connect(cssl), 0))
goto err;
}
if (!TEST_int_eq(SSL_read_early_data(sssl, buf, sizeof(buf),
&readbytes),
SSL_READ_EARLY_DATA_FINISH))
goto err;
}
/* Perform handshake (or complete it if doing early data ) */
if (!TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
goto err;
/*
* Check there were no unexpected CCS messages, all record versions
* were as expected, and that the session ids were reflected by the server
* correctly.
*/
if (!TEST_false(badccs) || !TEST_false(badvers) || !TEST_false(badsessid))
goto err;
switch (tst) {
case 0:
if (!TEST_true(sccsseen)
|| !TEST_true(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 1:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_eq(chsessidlen, 0))
goto err;
break;
case 2:
if (!TEST_false(sccsseen)
|| !TEST_true(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 3:
if (!TEST_true(sccsseen)
|| !TEST_true(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 4:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_eq(chsessidlen, 0))
goto err;
break;
case 5:
if (!TEST_false(sccsseen)
|| !TEST_true(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 6:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_true(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 7:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_eq(chsessidlen, 0))
goto err;
break;
case 8:
if (!TEST_false(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_true(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 9:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_true(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
case 10:
if (!TEST_true(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_false(ccsbeforesh)
|| !TEST_size_t_eq(chsessidlen, 0))
goto err;
break;
case 11:
if (!TEST_false(sccsseen)
|| !TEST_false(ccsaftersh)
|| !TEST_true(ccsbeforesh)
|| !TEST_size_t_gt(chsessidlen, 0))
goto err;
break;
default:
TEST_error("Invalid test value");
goto err;
}
ret = 1;
err:
SSL_SESSION_free(sess);
SSL_free(sssl);
SSL_free(cssl);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return ret;
}
OPT_TEST_DECLARE_USAGE("certfile privkeyfile\n")
int setup_tests(void)
{
if (!test_skip_common_options()) {
TEST_error("Error parsing test options\n");
return 0;
}
if (!TEST_ptr(cert = test_get_argument(0))
|| !TEST_ptr(privkey = test_get_argument(1)))
return 0;
ADD_ALL_TESTS(test_tls13ccs, 12);
return 1;
}
void cleanup_tests(void)
{
BIO_meth_free(method_watchccs);
}
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