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/*
* Copyright 2016-2020 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 may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
#include <string.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include "internal/packet.h"
#include "helpers/ssltestlib.h"
#include "testutil.h"
/* Should we fragment records or not? 0 = no, !0 = yes*/
static int fragment = 0;
static char *cert = NULL;
static char *privkey = NULL;
static int async_new(BIO *bi);
static int async_free(BIO *a);
static int async_read(BIO *b, char *out, int outl);
static int async_write(BIO *b, const char *in, int inl);
static long async_ctrl(BIO *b, int cmd, long num, void *ptr);
static int async_gets(BIO *bp, char *buf, int size);
static int async_puts(BIO *bp, const char *str);
/* Choose a sufficiently large type likely to be unused for this custom BIO */
# define BIO_TYPE_ASYNC_FILTER (0x80 | BIO_TYPE_FILTER)
static BIO_METHOD *methods_async = NULL;
struct async_ctrs {
unsigned int rctr;
unsigned int wctr;
};
static const BIO_METHOD *bio_f_async_filter(void)
{
if (methods_async == NULL) {
methods_async = BIO_meth_new(BIO_TYPE_ASYNC_FILTER, "Async filter");
if ( methods_async == NULL
|| !BIO_meth_set_write(methods_async, async_write)
|| !BIO_meth_set_read(methods_async, async_read)
|| !BIO_meth_set_puts(methods_async, async_puts)
|| !BIO_meth_set_gets(methods_async, async_gets)
|| !BIO_meth_set_ctrl(methods_async, async_ctrl)
|| !BIO_meth_set_create(methods_async, async_new)
|| !BIO_meth_set_destroy(methods_async, async_free))
return NULL;
}
return methods_async;
}
static int async_new(BIO *bio)
{
struct async_ctrs *ctrs;
ctrs = OPENSSL_zalloc(sizeof(struct async_ctrs));
if (ctrs == NULL)
return 0;
BIO_set_data(bio, ctrs);
BIO_set_init(bio, 1);
return 1;
}
static int async_free(BIO *bio)
{
struct async_ctrs *ctrs;
if (bio == NULL)
return 0;
ctrs = BIO_get_data(bio);
OPENSSL_free(ctrs);
BIO_set_data(bio, NULL);
BIO_set_init(bio, 0);
return 1;
}
static int async_read(BIO *bio, char *out, int outl)
{
struct async_ctrs *ctrs;
int ret = 0;
BIO *next = BIO_next(bio);
if (outl <= 0)
return 0;
if (next == NULL)
return 0;
ctrs = BIO_get_data(bio);
BIO_clear_retry_flags(bio);
if (ctrs->rctr > 0) {
ret = BIO_read(next, out, 1);
if (ret <= 0 && BIO_should_read(next))
BIO_set_retry_read(bio);
ctrs->rctr = 0;
} else {
ctrs->rctr++;
BIO_set_retry_read(bio);
}
return ret;
}
#define MIN_RECORD_LEN 6
#define CONTENTTYPEPOS 0
#define VERSIONHIPOS 1
#define VERSIONLOPOS 2
#define DATAPOS 5
static int async_write(BIO *bio, const char *in, int inl)
{
struct async_ctrs *ctrs;
int ret = 0;
size_t written = 0;
BIO *next = BIO_next(bio);
if (inl <= 0)
return 0;
if (next == NULL)
return 0;
ctrs = BIO_get_data(bio);
BIO_clear_retry_flags(bio);
if (ctrs->wctr > 0) {
ctrs->wctr = 0;
if (fragment) {
PACKET pkt;
if (!PACKET_buf_init(&pkt, (const unsigned char *)in, inl))
return -1;
while (PACKET_remaining(&pkt) > 0) {
PACKET payload, wholebody, sessionid, extensions;
unsigned int contenttype, versionhi, versionlo, data;
unsigned int msgtype = 0, negversion = 0;
if (!PACKET_get_1(&pkt, &contenttype)
|| !PACKET_get_1(&pkt, &versionhi)
|| !PACKET_get_1(&pkt, &versionlo)
|| !PACKET_get_length_prefixed_2(&pkt, &payload))
return -1;
/* Pretend we wrote out the record header */
written += SSL3_RT_HEADER_LENGTH;
wholebody = payload;
if (contenttype == SSL3_RT_HANDSHAKE
&& !PACKET_get_1(&wholebody, &msgtype))
return -1;
if (msgtype == SSL3_MT_SERVER_HELLO) {
if (!PACKET_forward(&wholebody,
SSL3_HM_HEADER_LENGTH - 1)
|| !PACKET_get_net_2(&wholebody, &negversion)
/* Skip random (32 bytes) */
|| !PACKET_forward(&wholebody, 32)
/* Skip session id */
|| !PACKET_get_length_prefixed_1(&wholebody,
&sessionid)
/*
* Skip ciphersuite (2 bytes) and compression
* method (1 byte)
*/
|| !PACKET_forward(&wholebody, 2 + 1)
|| !PACKET_get_length_prefixed_2(&wholebody,
&extensions))
return -1;
/*
* Find the negotiated version in supported_versions
* extension, if present.
*/
while (PACKET_remaining(&extensions)) {
unsigned int type;
PACKET extbody;
if (!PACKET_get_net_2(&extensions, &type)
|| !PACKET_get_length_prefixed_2(&extensions,
&extbody))
return -1;
if (type == TLSEXT_TYPE_supported_versions
&& (!PACKET_get_net_2(&extbody, &negversion)
|| PACKET_remaining(&extbody) != 0))
return -1;
}
}
while (PACKET_get_1(&payload, &data)) {
/* Create a new one byte long record for each byte in the
* record in the input buffer
*/
char smallrec[MIN_RECORD_LEN] = {
0, /* Content type */
0, /* Version hi */
0, /* Version lo */
0, /* Length hi */
1, /* Length lo */
0 /* Data */
};
smallrec[CONTENTTYPEPOS] = contenttype;
smallrec[VERSIONHIPOS] = versionhi;
smallrec[VERSIONLOPOS] = versionlo;
smallrec[DATAPOS] = data;
ret = BIO_write(next, smallrec, MIN_RECORD_LEN);
if (ret <= 0)
return -1;
written++;
}
/*
* We can't fragment anything after the ServerHello (or CCS <=
* TLS1.2), otherwise we get a bad record MAC
*/
if (contenttype == SSL3_RT_CHANGE_CIPHER_SPEC
|| (negversion == TLS1_3_VERSION
&& msgtype == SSL3_MT_SERVER_HELLO)) {
fragment = 0;
break;
}
}
}
/* Write any data we have left after fragmenting */
ret = 0;
if ((int)written < inl) {
ret = BIO_write(next, in + written, inl - written);
}
if (ret <= 0 && BIO_should_write(next))
BIO_set_retry_write(bio);
else
ret += written;
} else {
ctrs->wctr++;
BIO_set_retry_write(bio);
}
return ret;
}
static long async_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 = 0L;
break;
default:
ret = BIO_ctrl(next, cmd, num, ptr);
break;
}
return ret;
}
static int async_gets(BIO *bio, char *buf, int size)
{
/* We don't support this - not needed anyway */
return -1;
}
static int async_puts(BIO *bio, const char *str)
{
return async_write(bio, str, strlen(str));
}
#define MAX_ATTEMPTS 100
static int test_asyncio(int test)
{
SSL_CTX *serverctx = NULL, *clientctx = NULL;
SSL *serverssl = NULL, *clientssl = NULL;
BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
int testresult = 0, ret;
size_t i, j;
const char testdata[] = "Test data";
char buf[sizeof(testdata)];
if (!TEST_true(create_ssl_ctx_pair(NULL, TLS_server_method(),
TLS_client_method(),
TLS1_VERSION, 0,
&serverctx, &clientctx, cert, privkey)))
goto end;
/*
* We do 2 test runs. The first time around we just do a normal handshake
* with lots of async io going on. The second time around we also break up
* all records so that the content is only one byte length (up until the
* CCS)
*/
if (test == 1)
fragment = 1;
s_to_c_fbio = BIO_new(bio_f_async_filter());
c_to_s_fbio = BIO_new(bio_f_async_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 end;
}
/* BIOs get freed on error */
if (!TEST_true(create_ssl_objects(serverctx, clientctx, &serverssl,
&clientssl, s_to_c_fbio, c_to_s_fbio))
|| !TEST_true(create_ssl_connection(serverssl, clientssl,
SSL_ERROR_NONE)))
goto end;
/*
* Send and receive some test data. Do the whole thing twice to ensure
* we hit at least one async event in both reading and writing
*/
for (j = 0; j < 2; j++) {
int len;
/*
* Write some test data. It should never take more than 2 attempts
* (the first one might be a retryable fail).
*/
for (ret = -1, i = 0, len = 0; len != sizeof(testdata) && i < 2;
i++) {
ret = SSL_write(clientssl, testdata + len,
sizeof(testdata) - len);
if (ret > 0) {
len += ret;
} else {
int ssl_error = SSL_get_error(clientssl, ret);
if (!TEST_false(ssl_error == SSL_ERROR_SYSCALL ||
ssl_error == SSL_ERROR_SSL))
goto end;
}
}
if (!TEST_size_t_eq(len, sizeof(testdata)))
goto end;
/*
* Now read the test data. It may take more attempts here because
* it could fail once for each byte read, including all overhead
* bytes from the record header/padding etc.
*/
for (ret = -1, i = 0, len = 0; len != sizeof(testdata) &&
i < MAX_ATTEMPTS; i++) {
ret = SSL_read(serverssl, buf + len, sizeof(buf) - len);
if (ret > 0) {
len += ret;
} else {
int ssl_error = SSL_get_error(serverssl, ret);
if (!TEST_false(ssl_error == SSL_ERROR_SYSCALL ||
ssl_error == SSL_ERROR_SSL))
goto end;
}
}
if (!TEST_mem_eq(testdata, sizeof(testdata), buf, len))
goto end;
}
/* Also frees the BIOs */
SSL_free(clientssl);
SSL_free(serverssl);
clientssl = serverssl = NULL;
testresult = 1;
end:
SSL_free(clientssl);
SSL_free(serverssl);
SSL_CTX_free(clientctx);
SSL_CTX_free(serverctx);
return testresult;
}
OPT_TEST_DECLARE_USAGE("certname privkey\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_asyncio, 2);
return 1;
}
void cleanup_tests(void)
{
BIO_meth_free(methods_async);
}
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