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808 lines
19 KiB
C
808 lines
19 KiB
C
/*
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* Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* Special method for a BIO where the other endpoint is also a BIO of this
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* kind, handled by the same thread (i.e. the "peer" is actually ourselves,
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* wearing a different hat). Such "BIO pairs" are mainly for using the SSL
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* library with I/O interfaces for which no specific BIO method is available.
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* See ssl/ssltest.c for some hints on how this can be used.
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*/
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#include "e_os.h"
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bio_lcl.h"
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#include <openssl/err.h>
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#include <openssl/crypto.h>
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static int bio_new(BIO *bio);
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static int bio_free(BIO *bio);
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static int bio_read(BIO *bio, char *buf, int size);
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static int bio_write(BIO *bio, const char *buf, int num);
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static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);
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static int bio_puts(BIO *bio, const char *str);
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static int bio_make_pair(BIO *bio1, BIO *bio2);
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static void bio_destroy_pair(BIO *bio);
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static const BIO_METHOD methods_biop = {
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BIO_TYPE_BIO,
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"BIO pair",
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/* TODO: Convert to new style write function */
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bwrite_conv,
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bio_write,
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/* TODO: Convert to new style read function */
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bread_conv,
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bio_read,
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bio_puts,
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NULL /* no bio_gets */ ,
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bio_ctrl,
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bio_new,
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bio_free,
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NULL /* no bio_callback_ctrl */
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};
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const BIO_METHOD *BIO_s_bio(void)
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{
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return &methods_biop;
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}
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struct bio_bio_st {
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BIO *peer; /* NULL if buf == NULL. If peer != NULL, then
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* peer->ptr is also a bio_bio_st, and its
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* "peer" member points back to us. peer !=
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* NULL iff init != 0 in the BIO. */
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/* This is for what we write (i.e. reading uses peer's struct): */
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int closed; /* valid iff peer != NULL */
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size_t len; /* valid iff buf != NULL; 0 if peer == NULL */
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size_t offset; /* valid iff buf != NULL; 0 if len == 0 */
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size_t size;
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char *buf; /* "size" elements (if != NULL) */
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size_t request; /* valid iff peer != NULL; 0 if len != 0,
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* otherwise set by peer to number of bytes
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* it (unsuccessfully) tried to read, never
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* more than buffer space (size-len)
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* warrants. */
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};
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static int bio_new(BIO *bio)
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{
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struct bio_bio_st *b = OPENSSL_zalloc(sizeof(*b));
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if (b == NULL)
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return 0;
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/* enough for one TLS record (just a default) */
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b->size = 17 * 1024;
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bio->ptr = b;
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return 1;
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}
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static int bio_free(BIO *bio)
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{
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struct bio_bio_st *b;
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if (bio == NULL)
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return 0;
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b = bio->ptr;
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assert(b != NULL);
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if (b->peer)
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bio_destroy_pair(bio);
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OPENSSL_free(b->buf);
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OPENSSL_free(b);
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return 1;
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}
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static int bio_read(BIO *bio, char *buf, int size_)
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{
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size_t size = size_;
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size_t rest;
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struct bio_bio_st *b, *peer_b;
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BIO_clear_retry_flags(bio);
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if (!bio->init)
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return 0;
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b = bio->ptr;
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assert(b != NULL);
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assert(b->peer != NULL);
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peer_b = b->peer->ptr;
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assert(peer_b != NULL);
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assert(peer_b->buf != NULL);
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peer_b->request = 0; /* will be set in "retry_read" situation */
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if (buf == NULL || size == 0)
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return 0;
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if (peer_b->len == 0) {
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if (peer_b->closed)
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return 0; /* writer has closed, and no data is left */
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else {
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BIO_set_retry_read(bio); /* buffer is empty */
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if (size <= peer_b->size)
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peer_b->request = size;
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else
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/*
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* don't ask for more than the peer can deliver in one write
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*/
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peer_b->request = peer_b->size;
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return -1;
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}
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}
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/* we can read */
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if (peer_b->len < size)
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size = peer_b->len;
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/* now read "size" bytes */
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rest = size;
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assert(rest > 0);
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do { /* one or two iterations */
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size_t chunk;
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assert(rest <= peer_b->len);
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if (peer_b->offset + rest <= peer_b->size)
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chunk = rest;
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else
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/* wrap around ring buffer */
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chunk = peer_b->size - peer_b->offset;
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assert(peer_b->offset + chunk <= peer_b->size);
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memcpy(buf, peer_b->buf + peer_b->offset, chunk);
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peer_b->len -= chunk;
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if (peer_b->len) {
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peer_b->offset += chunk;
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assert(peer_b->offset <= peer_b->size);
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if (peer_b->offset == peer_b->size)
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peer_b->offset = 0;
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buf += chunk;
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} else {
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/* buffer now empty, no need to advance "buf" */
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assert(chunk == rest);
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peer_b->offset = 0;
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}
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rest -= chunk;
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}
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while (rest);
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return size;
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}
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/*-
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* non-copying interface: provide pointer to available data in buffer
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* bio_nread0: return number of available bytes
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* bio_nread: also advance index
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* (example usage: bio_nread0(), read from buffer, bio_nread()
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* or just bio_nread(), read from buffer)
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*/
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/*
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* WARNING: The non-copying interface is largely untested as of yet and may
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* contain bugs.
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*/
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static ossl_ssize_t bio_nread0(BIO *bio, char **buf)
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{
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struct bio_bio_st *b, *peer_b;
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ossl_ssize_t num;
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BIO_clear_retry_flags(bio);
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if (!bio->init)
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return 0;
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b = bio->ptr;
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assert(b != NULL);
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assert(b->peer != NULL);
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peer_b = b->peer->ptr;
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assert(peer_b != NULL);
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assert(peer_b->buf != NULL);
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peer_b->request = 0;
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if (peer_b->len == 0) {
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char dummy;
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/* avoid code duplication -- nothing available for reading */
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return bio_read(bio, &dummy, 1); /* returns 0 or -1 */
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}
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num = peer_b->len;
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if (peer_b->size < peer_b->offset + num)
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/* no ring buffer wrap-around for non-copying interface */
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num = peer_b->size - peer_b->offset;
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assert(num > 0);
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if (buf != NULL)
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*buf = peer_b->buf + peer_b->offset;
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return num;
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}
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static ossl_ssize_t bio_nread(BIO *bio, char **buf, size_t num_)
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{
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struct bio_bio_st *b, *peer_b;
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ossl_ssize_t num, available;
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if (num_ > OSSL_SSIZE_MAX)
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num = OSSL_SSIZE_MAX;
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else
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num = (ossl_ssize_t) num_;
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available = bio_nread0(bio, buf);
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if (num > available)
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num = available;
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if (num <= 0)
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return num;
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b = bio->ptr;
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peer_b = b->peer->ptr;
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peer_b->len -= num;
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if (peer_b->len) {
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peer_b->offset += num;
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assert(peer_b->offset <= peer_b->size);
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if (peer_b->offset == peer_b->size)
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peer_b->offset = 0;
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} else
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peer_b->offset = 0;
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return num;
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}
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static int bio_write(BIO *bio, const char *buf, int num_)
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{
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size_t num = num_;
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size_t rest;
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struct bio_bio_st *b;
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BIO_clear_retry_flags(bio);
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if (!bio->init || buf == NULL || num == 0)
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return 0;
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b = bio->ptr;
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assert(b != NULL);
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assert(b->peer != NULL);
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assert(b->buf != NULL);
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b->request = 0;
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if (b->closed) {
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/* we already closed */
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BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE);
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return -1;
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}
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assert(b->len <= b->size);
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if (b->len == b->size) {
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BIO_set_retry_write(bio); /* buffer is full */
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return -1;
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}
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/* we can write */
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if (num > b->size - b->len)
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num = b->size - b->len;
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/* now write "num" bytes */
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rest = num;
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assert(rest > 0);
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do { /* one or two iterations */
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size_t write_offset;
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size_t chunk;
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assert(b->len + rest <= b->size);
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write_offset = b->offset + b->len;
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if (write_offset >= b->size)
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write_offset -= b->size;
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/* b->buf[write_offset] is the first byte we can write to. */
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if (write_offset + rest <= b->size)
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chunk = rest;
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else
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/* wrap around ring buffer */
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chunk = b->size - write_offset;
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memcpy(b->buf + write_offset, buf, chunk);
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b->len += chunk;
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assert(b->len <= b->size);
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rest -= chunk;
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buf += chunk;
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}
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while (rest);
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return num;
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}
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/*-
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* non-copying interface: provide pointer to region to write to
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* bio_nwrite0: check how much space is available
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* bio_nwrite: also increase length
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* (example usage: bio_nwrite0(), write to buffer, bio_nwrite()
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* or just bio_nwrite(), write to buffer)
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*/
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static ossl_ssize_t bio_nwrite0(BIO *bio, char **buf)
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{
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struct bio_bio_st *b;
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size_t num;
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size_t write_offset;
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BIO_clear_retry_flags(bio);
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if (!bio->init)
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return 0;
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b = bio->ptr;
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assert(b != NULL);
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assert(b->peer != NULL);
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assert(b->buf != NULL);
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b->request = 0;
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if (b->closed) {
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BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);
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return -1;
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}
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assert(b->len <= b->size);
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if (b->len == b->size) {
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BIO_set_retry_write(bio);
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return -1;
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}
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num = b->size - b->len;
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write_offset = b->offset + b->len;
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if (write_offset >= b->size)
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write_offset -= b->size;
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if (write_offset + num > b->size)
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/*
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* no ring buffer wrap-around for non-copying interface (to fulfil
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* the promise by BIO_ctrl_get_write_guarantee, BIO_nwrite may have
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* to be called twice)
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*/
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num = b->size - write_offset;
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if (buf != NULL)
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*buf = b->buf + write_offset;
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assert(write_offset + num <= b->size);
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return num;
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}
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static ossl_ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_)
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{
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struct bio_bio_st *b;
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ossl_ssize_t num, space;
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if (num_ > OSSL_SSIZE_MAX)
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num = OSSL_SSIZE_MAX;
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else
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num = (ossl_ssize_t) num_;
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space = bio_nwrite0(bio, buf);
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if (num > space)
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num = space;
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if (num <= 0)
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return num;
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b = bio->ptr;
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assert(b != NULL);
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b->len += num;
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assert(b->len <= b->size);
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return num;
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}
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static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)
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{
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long ret;
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struct bio_bio_st *b = bio->ptr;
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assert(b != NULL);
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switch (cmd) {
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/* specific CTRL codes */
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case BIO_C_SET_WRITE_BUF_SIZE:
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if (b->peer) {
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BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE);
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ret = 0;
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} else if (num == 0) {
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BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT);
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ret = 0;
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} else {
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size_t new_size = num;
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if (b->size != new_size) {
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OPENSSL_free(b->buf);
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b->buf = NULL;
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b->size = new_size;
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}
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ret = 1;
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}
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break;
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case BIO_C_GET_WRITE_BUF_SIZE:
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ret = (long)b->size;
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break;
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case BIO_C_MAKE_BIO_PAIR:
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{
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BIO *other_bio = ptr;
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if (bio_make_pair(bio, other_bio))
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ret = 1;
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else
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ret = 0;
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}
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break;
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case BIO_C_DESTROY_BIO_PAIR:
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/*
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* Affects both BIOs in the pair -- call just once! Or let
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* BIO_free(bio1); BIO_free(bio2); do the job.
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*/
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bio_destroy_pair(bio);
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ret = 1;
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break;
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case BIO_C_GET_WRITE_GUARANTEE:
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/*
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* How many bytes can the caller feed to the next write without
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* having to keep any?
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*/
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if (b->peer == NULL || b->closed)
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ret = 0;
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else
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ret = (long)b->size - b->len;
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break;
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case BIO_C_GET_READ_REQUEST:
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/*
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* If the peer unsuccessfully tried to read, how many bytes were
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* requested? (As with BIO_CTRL_PENDING, that number can usually be
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* treated as boolean.)
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*/
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ret = (long)b->request;
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break;
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case BIO_C_RESET_READ_REQUEST:
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/*
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* Reset request. (Can be useful after read attempts at the other
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* side that are meant to be non-blocking, e.g. when probing SSL_read
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* to see if any data is available.)
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*/
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b->request = 0;
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ret = 1;
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break;
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case BIO_C_SHUTDOWN_WR:
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/* similar to shutdown(..., SHUT_WR) */
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b->closed = 1;
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ret = 1;
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break;
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case BIO_C_NREAD0:
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/* prepare for non-copying read */
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ret = (long)bio_nread0(bio, ptr);
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break;
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case BIO_C_NREAD:
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/* non-copying read */
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ret = (long)bio_nread(bio, ptr, (size_t)num);
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break;
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case BIO_C_NWRITE0:
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/* prepare for non-copying write */
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ret = (long)bio_nwrite0(bio, ptr);
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break;
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case BIO_C_NWRITE:
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/* non-copying write */
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ret = (long)bio_nwrite(bio, ptr, (size_t)num);
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break;
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/* standard CTRL codes follow */
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case BIO_CTRL_RESET:
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if (b->buf != NULL) {
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b->len = 0;
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b->offset = 0;
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}
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ret = 0;
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break;
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case BIO_CTRL_GET_CLOSE:
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ret = bio->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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bio->shutdown = (int)num;
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ret = 1;
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break;
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case BIO_CTRL_PENDING:
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if (b->peer != NULL) {
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struct bio_bio_st *peer_b = b->peer->ptr;
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ret = (long)peer_b->len;
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} else
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ret = 0;
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break;
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case BIO_CTRL_WPENDING:
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if (b->buf != NULL)
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ret = (long)b->len;
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else
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ret = 0;
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break;
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case BIO_CTRL_DUP:
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/* See BIO_dup_chain for circumstances we have to expect. */
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{
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BIO *other_bio = ptr;
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struct bio_bio_st *other_b;
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assert(other_bio != NULL);
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other_b = other_bio->ptr;
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assert(other_b != NULL);
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|
|
assert(other_b->buf == NULL); /* other_bio is always fresh */
|
|
|
|
other_b->size = b->size;
|
|
}
|
|
|
|
ret = 1;
|
|
break;
|
|
|
|
case BIO_CTRL_FLUSH:
|
|
ret = 1;
|
|
break;
|
|
|
|
case BIO_CTRL_EOF:
|
|
if (b->peer != NULL) {
|
|
struct bio_bio_st *peer_b = b->peer->ptr;
|
|
|
|
if (peer_b->len == 0 && peer_b->closed)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
} else {
|
|
ret = 1;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int bio_puts(BIO *bio, const char *str)
|
|
{
|
|
return bio_write(bio, str, strlen(str));
|
|
}
|
|
|
|
static int bio_make_pair(BIO *bio1, BIO *bio2)
|
|
{
|
|
struct bio_bio_st *b1, *b2;
|
|
|
|
assert(bio1 != NULL);
|
|
assert(bio2 != NULL);
|
|
|
|
b1 = bio1->ptr;
|
|
b2 = bio2->ptr;
|
|
|
|
if (b1->peer != NULL || b2->peer != NULL) {
|
|
BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);
|
|
return 0;
|
|
}
|
|
|
|
if (b1->buf == NULL) {
|
|
b1->buf = OPENSSL_malloc(b1->size);
|
|
if (b1->buf == NULL) {
|
|
BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
b1->len = 0;
|
|
b1->offset = 0;
|
|
}
|
|
|
|
if (b2->buf == NULL) {
|
|
b2->buf = OPENSSL_malloc(b2->size);
|
|
if (b2->buf == NULL) {
|
|
BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
b2->len = 0;
|
|
b2->offset = 0;
|
|
}
|
|
|
|
b1->peer = bio2;
|
|
b1->closed = 0;
|
|
b1->request = 0;
|
|
b2->peer = bio1;
|
|
b2->closed = 0;
|
|
b2->request = 0;
|
|
|
|
bio1->init = 1;
|
|
bio2->init = 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void bio_destroy_pair(BIO *bio)
|
|
{
|
|
struct bio_bio_st *b = bio->ptr;
|
|
|
|
if (b != NULL) {
|
|
BIO *peer_bio = b->peer;
|
|
|
|
if (peer_bio != NULL) {
|
|
struct bio_bio_st *peer_b = peer_bio->ptr;
|
|
|
|
assert(peer_b != NULL);
|
|
assert(peer_b->peer == bio);
|
|
|
|
peer_b->peer = NULL;
|
|
peer_bio->init = 0;
|
|
assert(peer_b->buf != NULL);
|
|
peer_b->len = 0;
|
|
peer_b->offset = 0;
|
|
|
|
b->peer = NULL;
|
|
bio->init = 0;
|
|
assert(b->buf != NULL);
|
|
b->len = 0;
|
|
b->offset = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Exported convenience functions */
|
|
int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1,
|
|
BIO **bio2_p, size_t writebuf2)
|
|
{
|
|
BIO *bio1 = NULL, *bio2 = NULL;
|
|
long r;
|
|
int ret = 0;
|
|
|
|
bio1 = BIO_new(BIO_s_bio());
|
|
if (bio1 == NULL)
|
|
goto err;
|
|
bio2 = BIO_new(BIO_s_bio());
|
|
if (bio2 == NULL)
|
|
goto err;
|
|
|
|
if (writebuf1) {
|
|
r = BIO_set_write_buf_size(bio1, writebuf1);
|
|
if (!r)
|
|
goto err;
|
|
}
|
|
if (writebuf2) {
|
|
r = BIO_set_write_buf_size(bio2, writebuf2);
|
|
if (!r)
|
|
goto err;
|
|
}
|
|
|
|
r = BIO_make_bio_pair(bio1, bio2);
|
|
if (!r)
|
|
goto err;
|
|
ret = 1;
|
|
|
|
err:
|
|
if (ret == 0) {
|
|
BIO_free(bio1);
|
|
bio1 = NULL;
|
|
BIO_free(bio2);
|
|
bio2 = NULL;
|
|
}
|
|
|
|
*bio1_p = bio1;
|
|
*bio2_p = bio2;
|
|
return ret;
|
|
}
|
|
|
|
size_t BIO_ctrl_get_write_guarantee(BIO *bio)
|
|
{
|
|
return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);
|
|
}
|
|
|
|
size_t BIO_ctrl_get_read_request(BIO *bio)
|
|
{
|
|
return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);
|
|
}
|
|
|
|
int BIO_ctrl_reset_read_request(BIO *bio)
|
|
{
|
|
return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0);
|
|
}
|
|
|
|
/*
|
|
* BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now
|
|
* (conceivably some other BIOs could allow non-copying reads and writes
|
|
* too.)
|
|
*/
|
|
int BIO_nread0(BIO *bio, char **buf)
|
|
{
|
|
long ret;
|
|
|
|
if (!bio->init) {
|
|
BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED);
|
|
return -2;
|
|
}
|
|
|
|
ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf);
|
|
if (ret > INT_MAX)
|
|
return INT_MAX;
|
|
else
|
|
return (int)ret;
|
|
}
|
|
|
|
int BIO_nread(BIO *bio, char **buf, int num)
|
|
{
|
|
int ret;
|
|
|
|
if (!bio->init) {
|
|
BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED);
|
|
return -2;
|
|
}
|
|
|
|
ret = (int)BIO_ctrl(bio, BIO_C_NREAD, num, buf);
|
|
if (ret > 0)
|
|
bio->num_read += ret;
|
|
return ret;
|
|
}
|
|
|
|
int BIO_nwrite0(BIO *bio, char **buf)
|
|
{
|
|
long ret;
|
|
|
|
if (!bio->init) {
|
|
BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED);
|
|
return -2;
|
|
}
|
|
|
|
ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf);
|
|
if (ret > INT_MAX)
|
|
return INT_MAX;
|
|
else
|
|
return (int)ret;
|
|
}
|
|
|
|
int BIO_nwrite(BIO *bio, char **buf, int num)
|
|
{
|
|
int ret;
|
|
|
|
if (!bio->init) {
|
|
BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED);
|
|
return -2;
|
|
}
|
|
|
|
ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf);
|
|
if (ret > 0)
|
|
bio->num_write += ret;
|
|
return ret;
|
|
}
|