mirror of
https://github.com/openssl/openssl.git
synced 2024-12-18 22:43:41 +08:00
362 lines
8.3 KiB
C
362 lines
8.3 KiB
C
/*
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* Copyright 2015-2016 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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#include <assert.h>
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#include "packet_locl.h"
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#define DEFAULT_BUF_SIZE 256
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int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
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{
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if (!WPACKET_reserve_bytes(pkt, len, allocbytes))
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return 0;
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pkt->written += len;
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pkt->curr += len;
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return 1;
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}
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int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
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unsigned char **allocbytes, size_t lenbytes)
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{
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if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
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|| !WPACKET_allocate_bytes(pkt, len, allocbytes)
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|| !WPACKET_close(pkt))
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return 0;
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return 1;
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}
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int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
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{
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/* Internal API, so should not fail */
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assert(pkt->subs != NULL && len != 0);
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if (pkt->subs == NULL || len == 0)
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return 0;
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if (pkt->maxsize - pkt->written < len)
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return 0;
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if (pkt->buf->length - pkt->written < len) {
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size_t newlen;
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size_t reflen;
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reflen = (len > pkt->buf->length) ? len : pkt->buf->length;
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if (reflen > SIZE_MAX / 2) {
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newlen = SIZE_MAX;
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} else {
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newlen = reflen * 2;
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if (newlen < DEFAULT_BUF_SIZE)
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newlen = DEFAULT_BUF_SIZE;
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}
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if (BUF_MEM_grow(pkt->buf, newlen) == 0)
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return 0;
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}
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*allocbytes = (unsigned char *)pkt->buf->data + pkt->curr;
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return 1;
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}
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int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
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unsigned char **allocbytes, size_t lenbytes)
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{
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if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes))
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return 0;
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*allocbytes += lenbytes;
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return 1;
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}
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static size_t maxmaxsize(size_t lenbytes)
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{
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if (lenbytes >= sizeof(size_t) || lenbytes == 0)
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return SIZE_MAX;
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return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes;
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}
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int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes)
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{
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unsigned char *lenchars;
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/* Internal API, so should not fail */
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assert(buf != NULL);
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if (buf == NULL)
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return 0;
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pkt->buf = buf;
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pkt->curr = 0;
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pkt->written = 0;
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pkt->maxsize = maxmaxsize(lenbytes);
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pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs));
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if (pkt->subs == NULL)
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return 0;
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if (lenbytes == 0)
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return 1;
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pkt->subs->pwritten = lenbytes;
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pkt->subs->lenbytes = lenbytes;
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if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) {
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OPENSSL_free(pkt->subs);
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pkt->subs = NULL;
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return 0;
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}
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pkt->subs->packet_len = lenchars - (unsigned char *)pkt->buf->data;
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return 1;
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}
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int WPACKET_init(WPACKET *pkt, BUF_MEM *buf)
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{
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return WPACKET_init_len(pkt, buf, 0);
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}
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int WPACKET_set_flags(WPACKET *pkt, unsigned int flags)
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{
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/* Internal API, so should not fail */
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assert(pkt->subs != NULL);
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if (pkt->subs == NULL)
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return 0;
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pkt->subs->flags = flags;
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return 1;
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}
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/* Store the |value| of length |len| at location |data| */
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static int put_value(unsigned char *data, size_t value, size_t len)
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{
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for (data += len - 1; len > 0; len--) {
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*data = (unsigned char)(value & 0xff);
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data--;
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value >>= 8;
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}
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/* Check whether we could fit the value in the assigned number of bytes */
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if (value > 0)
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return 0;
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return 1;
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}
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/*
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* Internal helper function used by WPACKET_close() and WPACKET_finish() to
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* close a sub-packet and write out its length if necessary.
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*/
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static int wpacket_intern_close(WPACKET *pkt)
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{
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WPACKET_SUB *sub = pkt->subs;
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size_t packlen = pkt->written - sub->pwritten;
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if (packlen == 0
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&& (sub->flags & WPACKET_FLAGS_NON_ZERO_LENGTH) != 0)
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return 0;
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if (packlen == 0
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&& sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) {
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/* Deallocate any bytes allocated for the length of the WPACKET */
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if ((pkt->curr - sub->lenbytes) == sub->packet_len) {
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pkt->written -= sub->lenbytes;
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pkt->curr -= sub->lenbytes;
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}
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/* Don't write out the packet length */
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sub->packet_len = 0;
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sub->lenbytes = 0;
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}
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/* Write out the WPACKET length if needed */
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if (sub->lenbytes > 0
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&& !put_value((unsigned char *)&pkt->buf->data[sub->packet_len],
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packlen, sub->lenbytes))
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return 0;
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pkt->subs = sub->parent;
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OPENSSL_free(sub);
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return 1;
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}
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int WPACKET_close(WPACKET *pkt)
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{
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/*
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* Internal API, so should not fail - but we do negative testing of this
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* so no assert (otherwise the tests fail)
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*/
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if (pkt->subs == NULL || pkt->subs->parent == NULL)
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return 0;
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return wpacket_intern_close(pkt);
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}
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int WPACKET_finish(WPACKET *pkt)
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{
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int ret;
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/*
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* Internal API, so should not fail - but we do negative testing of this
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* so no assert (otherwise the tests fail)
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*/
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if (pkt->subs == NULL || pkt->subs->parent != NULL)
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return 0;
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ret = wpacket_intern_close(pkt);
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if (ret) {
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OPENSSL_free(pkt->subs);
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pkt->subs = NULL;
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}
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return ret;
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}
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int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes)
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{
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WPACKET_SUB *sub;
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unsigned char *lenchars;
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/* Internal API, so should not fail */
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assert(pkt->subs != NULL);
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if (pkt->subs == NULL)
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return 0;
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sub = OPENSSL_zalloc(sizeof(*sub));
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if (sub == NULL)
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return 0;
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sub->parent = pkt->subs;
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pkt->subs = sub;
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sub->pwritten = pkt->written + lenbytes;
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sub->lenbytes = lenbytes;
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if (lenbytes == 0) {
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sub->packet_len = 0;
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return 1;
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}
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if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars))
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return 0;
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/* Convert to an offset in case the underlying BUF_MEM gets realloc'd */
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sub->packet_len = lenchars - (unsigned char *)pkt->buf->data;
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return 1;
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}
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int WPACKET_start_sub_packet(WPACKET *pkt)
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{
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return WPACKET_start_sub_packet_len__(pkt, 0);
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}
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int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size)
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{
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unsigned char *data;
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/* Internal API, so should not fail */
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assert(size <= sizeof(unsigned int));
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if (size > sizeof(unsigned int)
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|| !WPACKET_allocate_bytes(pkt, size, &data)
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|| !put_value(data, val, size))
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return 0;
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return 1;
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}
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int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize)
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{
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WPACKET_SUB *sub;
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size_t lenbytes;
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/* Internal API, so should not fail */
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assert(pkt->subs != NULL);
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if (pkt->subs == NULL)
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return 0;
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/* Find the WPACKET_SUB for the top level */
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for (sub = pkt->subs; sub->parent != NULL; sub = sub->parent)
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continue;
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lenbytes = sub->lenbytes;
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if (lenbytes == 0)
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lenbytes = sizeof(pkt->maxsize);
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if (maxmaxsize(lenbytes) < maxsize || maxsize < pkt->written)
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return 0;
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pkt->maxsize = maxsize;
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return 1;
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}
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int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len)
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{
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unsigned char *dest;
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if (len == 0)
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return 1;
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if (!WPACKET_allocate_bytes(pkt, len, &dest))
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return 0;
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memcpy(dest, src, len);
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return 1;
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}
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int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len,
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size_t lenbytes)
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{
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if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
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|| !WPACKET_memcpy(pkt, src, len)
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|| !WPACKET_close(pkt))
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return 0;
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return 1;
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}
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int WPACKET_get_total_written(WPACKET *pkt, size_t *written)
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{
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/* Internal API, so should not fail */
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assert(written != NULL);
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if (written == NULL)
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return 0;
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*written = pkt->written;
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return 1;
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}
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int WPACKET_get_length(WPACKET *pkt, size_t *len)
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{
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/* Internal API, so should not fail */
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assert(pkt->subs != NULL && len != NULL);
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if (pkt->subs == NULL || len == NULL)
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return 0;
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*len = pkt->written - pkt->subs->pwritten;
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return 1;
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}
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void WPACKET_cleanup(WPACKET *pkt)
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{
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WPACKET_SUB *sub, *parent;
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for (sub = pkt->subs; sub != NULL; sub = parent) {
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parent = sub->parent;
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OPENSSL_free(sub);
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}
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pkt->subs = NULL;
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}
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