/*
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL licenses, (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 "../ssl/packet_locl.h"
#include "ssltestlib.h"
/* Should we fragment records or not? 0 = no, !0 = yes*/
static int fragment = 0;
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()
{
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 = -1;
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 = -1;
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))
abort();
while (PACKET_remaining(&pkt) > 0) {
PACKET payload;
unsigned int contenttype, versionhi, versionlo, data;
if ( !PACKET_get_1(&pkt, &contenttype)
|| !PACKET_get_1(&pkt, &versionhi)
|| !PACKET_get_1(&pkt, &versionlo)
|| !PACKET_get_length_prefixed_2(&pkt, &payload))
abort();
/* Pretend we wrote out the record header */
written += SSL3_RT_HEADER_LENGTH;
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)
abort();
written++;
}
/*
* We can't fragment anything after the CCS, otherwise we
* get a bad record MAC
*/
if (contenttype == SSL3_RT_CHANGE_CIPHER_SPEC) {
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
int main(int argc, char *argv[])
{
SSL_CTX *serverctx = NULL, *clientctx = NULL;
SSL *serverssl = NULL, *clientssl = NULL;
BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
int test, err = 1, ret;
size_t i, j;
const char testdata[] = "Test data";
char buf[sizeof(testdata)];
CRYPTO_set_mem_debug(1);
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
if (argc != 3) {
printf("Invalid argument count\n");
goto end;
}
if (!create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
&serverctx, &clientctx, argv[1], argv[2])) {
printf("Failed to create SSL_CTX pair\n");
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)
*/
for (test = 1; test < 3; test++) {
if (test == 2)
fragment = 1;
s_to_c_fbio = BIO_new(bio_f_async_filter());
c_to_s_fbio = BIO_new(bio_f_async_filter());
if (s_to_c_fbio == NULL || c_to_s_fbio == NULL) {
printf("Failed to create filter BIOs\n");
BIO_free(s_to_c_fbio);
BIO_free(c_to_s_fbio);
goto end;
}
/* BIOs get freed on error */
if (!create_ssl_objects(serverctx, clientctx, &serverssl, &clientssl,
s_to_c_fbio, c_to_s_fbio)) {
printf("Test %d failed: Create SSL objects failed\n", test);
goto end;
}
if (!create_ssl_connection(serverssl, clientssl)) {
printf("Test %d failed: Create SSL connection failed\n", test);
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 (ssl_error == SSL_ERROR_SYSCALL ||
ssl_error == SSL_ERROR_SSL) {
printf("Test %d failed: Failed to write app data\n", test);
err = -1;
goto end;
}
}
}
if (len != sizeof(testdata)) {
err = -1;
printf("Test %d failed: Failed to write all app data\n", test);
goto end;
}
/*
* Now read the test data. It may take more attemps 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 (ssl_error == SSL_ERROR_SYSCALL ||
ssl_error == SSL_ERROR_SSL) {
printf("Test %d failed: Failed to read app data\n", test);
err = -1;
goto end;
}
}
}
if (len != sizeof(testdata)
|| memcmp(buf, testdata, sizeof(testdata)) != 0) {
err = -1;
printf("Test %d failed: Unexpected app data received\n", test);
goto end;
}
}
/* Also frees the BIOs */
SSL_free(clientssl);
SSL_free(serverssl);
clientssl = serverssl = NULL;
}
printf("Test success\n");
err = 0;
end:
if (err)
ERR_print_errors_fp(stderr);
SSL_free(clientssl);
SSL_free(serverssl);
SSL_CTX_free(clientctx);
SSL_CTX_free(serverctx);
# ifndef OPENSSL_NO_CRYPTO_MDEBUG
CRYPTO_mem_leaks_fp(stderr);
# endif
return err;
}
