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/* $OpenBSD: tls_bio_cb.c,v 1.20 2022/01/10 23:39:48 tb Exp $ */
/*
* Copyright (c) 2016 Tobias Pape <tobias@netshed.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/bio.h>
#include <tls.h>
#include "tls_internal.h"
static int bio_cb_write(BIO *bio, const char *buf, int num);
static int bio_cb_read(BIO *bio, char *buf, int size);
static int bio_cb_puts(BIO *bio, const char *str);
static long bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr);
static BIO_METHOD *bio_cb_method;
static pthread_mutex_t bio_cb_method_lock = PTHREAD_MUTEX_INITIALIZER;
static void
bio_cb_method_init(void)
{
BIO_METHOD *bio_method;
if (bio_cb_method != NULL)
return;
bio_method = BIO_meth_new(BIO_TYPE_MEM, "libtls_callbacks");
if (bio_method == NULL)
return;
BIO_meth_set_write(bio_method, bio_cb_write);
BIO_meth_set_read(bio_method, bio_cb_read);
BIO_meth_set_puts(bio_method, bio_cb_puts);
BIO_meth_set_ctrl(bio_method, bio_cb_ctrl);
bio_cb_method = bio_method;
}
static BIO_METHOD *
bio_s_cb(void)
{
if (bio_cb_method != NULL)
return (bio_cb_method);
pthread_mutex_lock(&bio_cb_method_lock);
bio_cb_method_init();
pthread_mutex_unlock(&bio_cb_method_lock);
return (bio_cb_method);
}
static int
bio_cb_puts(BIO *bio, const char *str)
{
return (bio_cb_write(bio, str, strlen(str)));
}
static long
bio_cb_ctrl(BIO *bio, int cmd, long num, void *ptr)
{
long ret = 1;
switch (cmd) {
case BIO_CTRL_GET_CLOSE:
ret = (long)BIO_get_shutdown(bio);
break;
case BIO_CTRL_SET_CLOSE:
BIO_set_shutdown(bio, (int)num);
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
break;
case BIO_CTRL_INFO:
case BIO_CTRL_GET:
case BIO_CTRL_SET:
default:
ret = BIO_ctrl(BIO_next(bio), cmd, num, ptr);
}
return (ret);
}
static int
bio_cb_write(BIO *bio, const char *buf, int num)
{
struct tls *ctx = BIO_get_data(bio);
int rv;
BIO_clear_retry_flags(bio);
rv = (ctx->write_cb)(ctx, buf, num, ctx->cb_arg);
if (rv == TLS_WANT_POLLIN) {
BIO_set_retry_read(bio);
rv = -1;
} else if (rv == TLS_WANT_POLLOUT) {
BIO_set_retry_write(bio);
rv = -1;
}
return (rv);
}
static int
bio_cb_read(BIO *bio, char *buf, int size)
{
struct tls *ctx = BIO_get_data(bio);
int rv;
BIO_clear_retry_flags(bio);
rv = (ctx->read_cb)(ctx, buf, size, ctx->cb_arg);
if (rv == TLS_WANT_POLLIN) {
BIO_set_retry_read(bio);
rv = -1;
} else if (rv == TLS_WANT_POLLOUT) {
BIO_set_retry_write(bio);
rv = -1;
}
return (rv);
}
int
tls_set_cbs(struct tls *ctx, tls_read_cb read_cb, tls_write_cb write_cb,
void *cb_arg)
{
const BIO_METHOD *bio_cb;
BIO *bio;
int rv = -1;
if (read_cb == NULL || write_cb == NULL) {
tls_set_errorx(ctx, "no callbacks provided");
goto err;
}
ctx->read_cb = read_cb;
ctx->write_cb = write_cb;
ctx->cb_arg = cb_arg;
if ((bio_cb = bio_s_cb()) == NULL) {
tls_set_errorx(ctx, "failed to create callback method");
goto err;
}
if ((bio = BIO_new(bio_cb)) == NULL) {
tls_set_errorx(ctx, "failed to create callback i/o");
goto err;
}
BIO_set_data(bio, ctx);
BIO_set_init(bio, 1);
SSL_set_bio(ctx->ssl_conn, bio, bio);
rv = 0;
err:
return (rv);
}
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