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/* $OpenBSD: tls_bio_cb.c,v 1.2 2016/09/04 12:54:33 jsing 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 <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "tls.h"
#include "tls_internal.h"
#include <openssl/bio.h>
static int write_cb(BIO *b, const char *buf, int num);
static int read_cb(BIO *b, char *buf, int size);
static int puts_cb(BIO *b, const char *str);
static long ctrl_cb(BIO *b, int cmd, long num, void *ptr);
static int new_cb(BIO *b);
static int free_cb(BIO *data);
struct bio_cb_st {
int (*write_cb)(BIO *h, const char *buf, int num, void *cb_arg);
int (*read_cb)(BIO *h, char *buf, int size, void *cb_arg);
void *cb_arg;
};
static BIO_METHOD cb_method = {
.type = BIO_TYPE_MEM,
.name = "libtls_callbacks",
.bwrite = write_cb,
.bread = read_cb,
.bputs = puts_cb,
.ctrl = ctrl_cb,
.create = new_cb,
.destroy = free_cb
};
static BIO_METHOD *
bio_s_cb(void)
{
return (&cb_method);
}
static int
bio_set_write_cb(BIO *bi,
int (*write_cb)(BIO *h, const char *buf, int num, void *cb_arg))
{
struct bio_cb_st *b;
b = (struct bio_cb_st *)bi->ptr;
b->write_cb = write_cb;
return (0);
}
static int
bio_set_read_cb(BIO *bi,
int (*read_cb)(BIO *h, char *buf, int size, void *cb_arg))
{
struct bio_cb_st *b;
b = (struct bio_cb_st *)bi->ptr;
b->read_cb = read_cb;
return (0);
}
static int
bio_set_cb_arg(BIO *bi, void *cb_arg)
{
struct bio_cb_st *b;
b = (struct bio_cb_st *)bi->ptr;
b->cb_arg = cb_arg;
return (0);
}
static int
new_cb(BIO *bi)
{
struct bio_cb_st *bcb;
bcb = calloc(1, sizeof(struct bio_cb_st));
if (bcb == NULL)
return (0);
bi->shutdown = 1;
bi->init = 1;
bi->num = -1;
bi->ptr = (char *)bcb;
return (1);
}
static int
free_cb(BIO *bi)
{
if (bi == NULL)
return (0);
if (bi->shutdown) {
if ((bi->init) && (bi->ptr != NULL)) {
struct bio_cb_st *b;
b = (struct bio_cb_st *)bi->ptr;
free(b);
bi->ptr = NULL;
}
}
return (1);
}
static int
read_cb(BIO *b, char *buf, int size)
{
struct bio_cb_st *bcb = b->ptr;
return (bcb->read_cb(b, buf, size, bcb->cb_arg));
}
static int
write_cb(BIO *b, const char *buf, int num)
{
struct bio_cb_st *bcb = b->ptr;
return (bcb->write_cb(b, buf, num, bcb->cb_arg));
}
static int
puts_cb(BIO *b, const char *str)
{
int n;
n = strlen(str);
return (write_cb(b, str, n));
}
static long
ctrl_cb(BIO *b, int cmd, long num, void *ptr)
{
long ret = 1;
switch (cmd) {
case BIO_CTRL_GET_CLOSE:
ret = (long)b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_DUP:
break;
case BIO_CTRL_INFO:
case BIO_CTRL_GET:
case BIO_CTRL_SET:
default:
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
}
return (ret);
}
static int
tls_bio_write_cb(BIO *h, const char *buf, int num, void *cb_arg)
{
struct tls *ctx = cb_arg;
return (ctx->write_cb)(ctx, buf, num, ctx->cb_arg);
}
static int
tls_bio_read_cb(BIO *h, char *buf, int size, void *cb_arg)
{
struct tls *ctx = cb_arg;
return (ctx->read_cb)(ctx, buf, size, ctx->cb_arg);
}
static BIO *
tls_get_new_cb_bio(struct tls *ctx)
{
BIO *bcb;
if (ctx->read_cb == NULL || ctx->write_cb == NULL)
tls_set_errorx(ctx, "no callbacks registered");
bcb = BIO_new(bio_s_cb());
if (bcb == NULL) {
tls_set_errorx(ctx, "failed to create callback i/o");
return (NULL);
}
bio_set_write_cb(bcb, tls_bio_write_cb);
bio_set_read_cb(bcb, tls_bio_read_cb);
bio_set_cb_arg(bcb, ctx);
return (bcb);
}
int
tls_set_cbs(struct tls *ctx, tls_read_cb read_cb, tls_write_cb write_cb,
void *cb_arg)
{
int rv = -1;
BIO *bcb;
ctx->read_cb = read_cb;
ctx->write_cb = write_cb;
ctx->cb_arg = cb_arg;
bcb = tls_get_new_cb_bio(ctx);
if (bcb == NULL) {
tls_set_errorx(ctx, "failed to create callback i/o");
goto err;
}
SSL_set_bio(ctx->ssl_conn, bcb, bcb);
rv = 0;
err:
return (rv);
}
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