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openssl/ssl/bio_ssl.c

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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openssl/crypto.h>
#include "internal/bio.h"
#include <openssl/err.h>
#include "ssl_local.h"
static int ssl_write(BIO *h, const char *buf, size_t size, size_t *written);
static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes);
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;
size_t byte_count;
unsigned long renegotiate_timeout;
unsigned long last_time;
} BIO_SSL;
static const BIO_METHOD methods_sslp = {
BIO_TYPE_SSL,
"ssl",
ssl_write,
NULL, /* ssl_write_old, */
ssl_read,
NULL, /* ssl_read_old, */
ssl_puts,
NULL, /* ssl_gets, */
ssl_ctrl,
ssl_new,
ssl_free,
ssl_callback_ctrl,
};
const BIO_METHOD *BIO_f_ssl(void)
{
return &methods_sslp;
}
static int ssl_new(BIO *bi)
{
BIO_SSL *bs = OPENSSL_zalloc(sizeof(*bs));
if (bs == NULL) {
BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
BIO_set_init(bi, 0);
BIO_set_data(bi, bs);
/* Clear all flags */
BIO_clear_flags(bi, ~0);
return 1;
}
static int ssl_free(BIO *a)
{
BIO_SSL *bs;
if (a == NULL)
return 0;
bs = BIO_get_data(a);
if (BIO_get_shutdown(a)) {
if (bs->ssl != NULL)
SSL_shutdown(bs->ssl);
if (BIO_get_init(a))
SSL_free(bs->ssl);
BIO_clear_flags(a, ~0); /* Clear all flags */
BIO_set_init(a, 0);
}
OPENSSL_free(bs);
return 1;
}
static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes)
{
int ret = 1;
BIO_SSL *sb;
SSL *ssl;
int retry_reason = 0;
int r = 0;
if (buf == NULL)
return 0;
sb = BIO_get_data(b);
ssl = sb->ssl;
BIO_clear_retry_flags(b);
ret = ssl_read_internal(ssl, buf, size, readbytes);
switch (SSL_get_error(ssl, ret)) {
case SSL_ERROR_NONE:
if (sb->renegotiate_count > 0) {
sb->byte_count += *readbytes;
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;
}
BIO_set_retry_reason(b, retry_reason);
return ret;
}
static int ssl_write(BIO *b, const char *buf, size_t size, size_t *written)
{
int ret, r = 0;
int retry_reason = 0;
SSL *ssl;
BIO_SSL *bs;
if (buf == NULL)
return 0;
bs = BIO_get_data(b);
ssl = bs->ssl;
BIO_clear_retry_flags(b);
ret = ssl_write_internal(ssl, buf, size, written);
switch (SSL_get_error(ssl, ret)) {
case SSL_ERROR_NONE:
if (bs->renegotiate_count > 0) {
bs->byte_count += *written;
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;
}
BIO_set_retry_reason(b, retry_reason);
return ret;
}
static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
{
SSL **sslp, *ssl;
BIO_SSL *bs, *dbs;
BIO *dbio, *bio;
long ret = 1;
BIO *next;
bs = BIO_get_data(b);
next = BIO_next(b);
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);
if (!SSL_clear(ssl)) {
ret = 0;
break;
}
if (next != NULL)
ret = BIO_ctrl(next, 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;
bs = BIO_get_data(b);
}
BIO_set_shutdown(b, num);
ssl = (SSL *)ptr;
bs->ssl = ssl;
bio = SSL_get_rbio(ssl);
if (bio != NULL) {
if (next != NULL)
BIO_push(bio, next);
BIO_set_next(b, bio);
BIO_up_ref(bio);
}
BIO_set_init(b, 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 = BIO_get_shutdown(b);
break;
case BIO_CTRL_SET_CLOSE:
BIO_set_shutdown(b, (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 ((next != NULL) && (next != ssl->rbio)) {
/*
* We are going to pass ownership of next to the SSL object...but
* we don't own a reference to pass yet - so up ref
*/
BIO_up_ref(next);
SSL_set_bio(ssl, next, next);
}
break;
case BIO_CTRL_POP:
/* Only detach if we are the BIO explicitly being popped */
if (b == ptr) {
/* This will clear the reference we obtained during push */
SSL_set_bio(ssl, NULL, NULL);
}
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
BIO_set_retry_reason(b, 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);
BIO_set_retry_reason(b, BIO_get_retry_reason(next));
break;
case SSL_ERROR_WANT_X509_LOOKUP:
BIO_set_retry_special(b);
BIO_set_retry_reason(b, BIO_RR_SSL_X509_LOOKUP);
break;
default:
break;
}
break;
case BIO_CTRL_DUP:
dbio = (BIO *)ptr;
dbs = BIO_get_data(dbio);
SSL_free(dbs->ssl);
dbs->ssl = SSL_dup(ssl);
dbs->num_renegotiates = bs->num_renegotiates;
dbs->renegotiate_count = bs->renegotiate_count;
dbs->byte_count = bs->byte_count;
dbs->renegotiate_timeout = bs->renegotiate_timeout;
dbs->last_time = bs->last_time;
ret = (dbs->ssl != NULL);
break;
case BIO_C_GET_FD:
ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
break;
case BIO_CTRL_SET_CALLBACK:
ret = 0; /* use callback ctrl */
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_get_data(b);
ssl = bs->ssl;
switch (cmd) {
case BIO_CTRL_SET_CALLBACK:
ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
break;
default:
ret = 0;
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:
BIO_free(buf);
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:
BIO_free(ssl);
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)
{
BIO_SSL *tdata, *fdata;
t = BIO_find_type(t, BIO_TYPE_SSL);
f = BIO_find_type(f, BIO_TYPE_SSL);
if ((t == NULL) || (f == NULL))
return 0;
tdata = BIO_get_data(t);
fdata = BIO_get_data(f);
if ((tdata->ssl == NULL) || (fdata->ssl == NULL))
return 0;
if (!SSL_copy_session_id(tdata->ssl, (fdata->ssl)))
return 0;
return 1;
}
void BIO_ssl_shutdown(BIO *b)
{
BIO_SSL *bdata;
for (; b != NULL; b = BIO_next(b)) {
if (BIO_method_type(b) != BIO_TYPE_SSL)
continue;
bdata = BIO_get_data(b);
if (bdata != NULL && bdata->ssl != NULL)
SSL_shutdown(bdata->ssl);
}
}
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