openssl1.0/ssl/bio_ssl.c

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2019-08-09 10:00:55 +02:00
/* ssl/bio_ssl.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
static int ssl_write(BIO *h, const char *buf, int num);
static int ssl_read(BIO *h, char *buf, int size);
static int ssl_puts(BIO *h, const char *str);
static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int ssl_new(BIO *h);
static int ssl_free(BIO *data);
static long ssl_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
typedef struct bio_ssl_st {
SSL *ssl; /* The ssl handle :-) */
/* re-negotiate every time the total number of bytes is this size */
int num_renegotiates;
unsigned long renegotiate_count;
unsigned long byte_count;
unsigned long renegotiate_timeout;
unsigned long last_time;
} BIO_SSL;
static BIO_METHOD methods_sslp = {
BIO_TYPE_SSL, "ssl",
ssl_write,
ssl_read,
ssl_puts,
NULL, /* ssl_gets, */
ssl_ctrl,
ssl_new,
ssl_free,
ssl_callback_ctrl,
};
BIO_METHOD *BIO_f_ssl(void)
{
return (&methods_sslp);
}
static int ssl_new(BIO *bi)
{
BIO_SSL *bs;
bs = (BIO_SSL *)OPENSSL_malloc(sizeof(BIO_SSL));
if (bs == NULL) {
BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
return (0);
}
memset(bs, 0, sizeof(BIO_SSL));
bi->init = 0;
bi->ptr = (char *)bs;
bi->flags = 0;
return (1);
}
static int ssl_free(BIO *a)
{
BIO_SSL *bs;
if (a == NULL)
return (0);
bs = (BIO_SSL *)a->ptr;
if (bs->ssl != NULL)
SSL_shutdown(bs->ssl);
if (a->shutdown) {
if (a->init && (bs->ssl != NULL))
SSL_free(bs->ssl);
a->init = 0;
a->flags = 0;
}
if (a->ptr != NULL)
OPENSSL_free(a->ptr);
return (1);
}
static int ssl_read(BIO *b, char *out, int outl)
{
int ret = 1;
BIO_SSL *sb;
SSL *ssl;
int retry_reason = 0;
int r = 0;
if (out == NULL)
return (0);
sb = (BIO_SSL *)b->ptr;
ssl = sb->ssl;
BIO_clear_retry_flags(b);
#if 0
if (!SSL_is_init_finished(ssl)) {
/* ret=SSL_do_handshake(ssl); */
if (ret > 0) {
outflags = (BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
ret = -1;
goto end;
}
}
#endif
/* if (ret > 0) */
ret = SSL_read(ssl, out, outl);
switch (SSL_get_error(ssl, ret)) {
case SSL_ERROR_NONE:
if (ret <= 0)
break;
if (sb->renegotiate_count > 0) {
sb->byte_count += ret;
if (sb->byte_count > sb->renegotiate_count) {
sb->byte_count = 0;
sb->num_renegotiates++;
SSL_renegotiate(ssl);
r = 1;
}
}
if ((sb->renegotiate_timeout > 0) && (!r)) {
unsigned long tm;
tm = (unsigned long)time(NULL);
if (tm > sb->last_time + sb->renegotiate_timeout) {
sb->last_time = tm;
sb->num_renegotiates++;
SSL_renegotiate(ssl);
}
}
break;
case SSL_ERROR_WANT_READ:
BIO_set_retry_read(b);
break;
case SSL_ERROR_WANT_WRITE:
BIO_set_retry_write(b);
break;
case SSL_ERROR_WANT_X509_LOOKUP:
BIO_set_retry_special(b);
retry_reason = BIO_RR_SSL_X509_LOOKUP;
break;
case SSL_ERROR_WANT_ACCEPT:
BIO_set_retry_special(b);
retry_reason = BIO_RR_ACCEPT;
break;
case SSL_ERROR_WANT_CONNECT:
BIO_set_retry_special(b);
retry_reason = BIO_RR_CONNECT;
break;
case SSL_ERROR_SYSCALL:
case SSL_ERROR_SSL:
case SSL_ERROR_ZERO_RETURN:
default:
break;
}
b->retry_reason = retry_reason;
return (ret);
}
static int ssl_write(BIO *b, const char *out, int outl)
{
int ret, r = 0;
int retry_reason = 0;
SSL *ssl;
BIO_SSL *bs;
if (out == NULL)
return (0);
bs = (BIO_SSL *)b->ptr;
ssl = bs->ssl;
BIO_clear_retry_flags(b);
/*
* ret=SSL_do_handshake(ssl); if (ret > 0)
*/
ret = SSL_write(ssl, out, outl);
switch (SSL_get_error(ssl, ret)) {
case SSL_ERROR_NONE:
if (ret <= 0)
break;
if (bs->renegotiate_count > 0) {
bs->byte_count += ret;
if (bs->byte_count > bs->renegotiate_count) {
bs->byte_count = 0;
bs->num_renegotiates++;
SSL_renegotiate(ssl);
r = 1;
}
}
if ((bs->renegotiate_timeout > 0) && (!r)) {
unsigned long tm;
tm = (unsigned long)time(NULL);
if (tm > bs->last_time + bs->renegotiate_timeout) {
bs->last_time = tm;
bs->num_renegotiates++;
SSL_renegotiate(ssl);
}
}
break;
case SSL_ERROR_WANT_WRITE:
BIO_set_retry_write(b);
break;
case SSL_ERROR_WANT_READ:
BIO_set_retry_read(b);
break;
case SSL_ERROR_WANT_X509_LOOKUP:
BIO_set_retry_special(b);
retry_reason = BIO_RR_SSL_X509_LOOKUP;
break;
case SSL_ERROR_WANT_CONNECT:
BIO_set_retry_special(b);
retry_reason = BIO_RR_CONNECT;
case SSL_ERROR_SYSCALL:
case SSL_ERROR_SSL:
default:
break;
}
b->retry_reason = retry_reason;
return (ret);
}
static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
{
SSL **sslp, *ssl;
BIO_SSL *bs;
BIO *dbio, *bio;
long ret = 1;
bs = (BIO_SSL *)b->ptr;
ssl = bs->ssl;
if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))
return (0);
switch (cmd) {
case BIO_CTRL_RESET:
SSL_shutdown(ssl);
if (ssl->handshake_func == ssl->method->ssl_connect)
SSL_set_connect_state(ssl);
else if (ssl->handshake_func == ssl->method->ssl_accept)
SSL_set_accept_state(ssl);
SSL_clear(ssl);
if (b->next_bio != NULL)
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
else if (ssl->rbio != NULL)
ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
else
ret = 1;
break;
case BIO_CTRL_INFO:
ret = 0;
break;
case BIO_C_SSL_MODE:
if (num) /* client mode */
SSL_set_connect_state(ssl);
else
SSL_set_accept_state(ssl);
break;
case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
ret = bs->renegotiate_timeout;
if (num < 60)
num = 5;
bs->renegotiate_timeout = (unsigned long)num;
bs->last_time = (unsigned long)time(NULL);
break;
case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
ret = bs->renegotiate_count;
if ((long)num >= 512)
bs->renegotiate_count = (unsigned long)num;
break;
case BIO_C_GET_SSL_NUM_RENEGOTIATES:
ret = bs->num_renegotiates;
break;
case BIO_C_SET_SSL:
if (ssl != NULL) {
ssl_free(b);
if (!ssl_new(b))
return 0;
}
b->shutdown = (int)num;
ssl = (SSL *)ptr;
((BIO_SSL *)b->ptr)->ssl = ssl;
bio = SSL_get_rbio(ssl);
if (bio != NULL) {
if (b->next_bio != NULL)
BIO_push(bio, b->next_bio);
b->next_bio = bio;
CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO);
}
b->init = 1;
break;
case BIO_C_GET_SSL:
if (ptr != NULL) {
sslp = (SSL **)ptr;
*sslp = ssl;
} else
ret = 0;
break;
case BIO_CTRL_GET_CLOSE:
ret = b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_WPENDING:
ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
break;
case BIO_CTRL_PENDING:
ret = SSL_pending(ssl);
if (ret == 0)
ret = BIO_pending(ssl->rbio);
break;
case BIO_CTRL_FLUSH:
BIO_clear_retry_flags(b);
ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_PUSH:
if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio)) {
SSL_set_bio(ssl, b->next_bio, b->next_bio);
CRYPTO_add(&b->next_bio->references, 1, CRYPTO_LOCK_BIO);
}
break;
case BIO_CTRL_POP:
/* Only detach if we are the BIO explicitly being popped */
if (b == ptr) {
/*
* Shouldn't happen in practice because the rbio and wbio are the
* same when pushed.
*/
if (ssl->rbio != ssl->wbio)
BIO_free_all(ssl->wbio);
if (b->next_bio != NULL)
CRYPTO_add(&b->next_bio->references, -1, CRYPTO_LOCK_BIO);
ssl->wbio = NULL;
ssl->rbio = NULL;
}
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
b->retry_reason = 0;
ret = (int)SSL_do_handshake(ssl);
switch (SSL_get_error(ssl, (int)ret)) {
case SSL_ERROR_WANT_READ:
BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
break;
case SSL_ERROR_WANT_WRITE:
BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
break;
case SSL_ERROR_WANT_CONNECT:
BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
b->retry_reason = b->next_bio->retry_reason;
break;
case SSL_ERROR_WANT_X509_LOOKUP:
BIO_set_retry_special(b);
b->retry_reason = BIO_RR_SSL_X509_LOOKUP;
break;
default:
break;
}
break;
case BIO_CTRL_DUP:
dbio = (BIO *)ptr;
if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
((BIO_SSL *)dbio->ptr)->ssl = SSL_dup(ssl);
((BIO_SSL *)dbio->ptr)->renegotiate_count =
((BIO_SSL *)b->ptr)->renegotiate_count;
((BIO_SSL *)dbio->ptr)->byte_count = ((BIO_SSL *)b->ptr)->byte_count;
((BIO_SSL *)dbio->ptr)->renegotiate_timeout =
((BIO_SSL *)b->ptr)->renegotiate_timeout;
((BIO_SSL *)dbio->ptr)->last_time = ((BIO_SSL *)b->ptr)->last_time;
ret = (((BIO_SSL *)dbio->ptr)->ssl != NULL);
break;
case BIO_C_GET_FD:
ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
break;
case BIO_CTRL_SET_CALLBACK:
{
#if 0 /* FIXME: Should this be used? -- Richard
* Levitte */
SSLerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
ret = -1;
#else
ret = 0;
#endif
}
break;
case BIO_CTRL_GET_CALLBACK:
{
void (**fptr) (const SSL *xssl, int type, int val);
fptr = (void (**)(const SSL *xssl, int type, int val))ptr;
*fptr = SSL_get_info_callback(ssl);
}
break;
default:
ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
break;
}
return (ret);
}
static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
SSL *ssl;
BIO_SSL *bs;
long ret = 1;
bs = (BIO_SSL *)b->ptr;
ssl = bs->ssl;
switch (cmd) {
case BIO_CTRL_SET_CALLBACK:
{
/*
* FIXME: setting this via a completely different prototype seems
* like a crap idea
*/
SSL_set_info_callback(ssl, (void (*)(const SSL *, int, int))fp);
}
break;
default:
ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
break;
}
return (ret);
}
static int ssl_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = BIO_write(bp, str, n);
return (ret);
}
BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
{
#ifndef OPENSSL_NO_SOCK
BIO *ret = NULL, *buf = NULL, *ssl = NULL;
if ((buf = BIO_new(BIO_f_buffer())) == NULL)
return (NULL);
if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)
goto err;
if ((ret = BIO_push(buf, ssl)) == NULL)
goto err;
return (ret);
err:
if (buf != NULL)
BIO_free(buf);
if (ssl != NULL)
BIO_free(ssl);
#endif
return (NULL);
}
BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
{
#ifndef OPENSSL_NO_SOCK
BIO *ret = NULL, *con = NULL, *ssl = NULL;
if ((con = BIO_new(BIO_s_connect())) == NULL)
return (NULL);
if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)
goto err;
if ((ret = BIO_push(ssl, con)) == NULL)
goto err;
return (ret);
err:
if (con != NULL)
BIO_free(con);
#endif
return (NULL);
}
BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
{
BIO *ret;
SSL *ssl;
if ((ret = BIO_new(BIO_f_ssl())) == NULL)
return (NULL);
if ((ssl = SSL_new(ctx)) == NULL) {
BIO_free(ret);
return (NULL);
}
if (client)
SSL_set_connect_state(ssl);
else
SSL_set_accept_state(ssl);
BIO_set_ssl(ret, ssl, BIO_CLOSE);
return (ret);
}
int BIO_ssl_copy_session_id(BIO *t, BIO *f)
{
t = BIO_find_type(t, BIO_TYPE_SSL);
f = BIO_find_type(f, BIO_TYPE_SSL);
if ((t == NULL) || (f == NULL))
return (0);
if ((((BIO_SSL *)t->ptr)->ssl == NULL) ||
(((BIO_SSL *)f->ptr)->ssl == NULL))
return (0);
SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl, ((BIO_SSL *)f->ptr)->ssl);
return (1);
}
void BIO_ssl_shutdown(BIO *b)
{
SSL *s;
while (b != NULL) {
if (b->method->type == BIO_TYPE_SSL) {
s = ((BIO_SSL *)b->ptr)->ssl;
SSL_shutdown(s);
break;
}
b = b->next_bio;
}
}