165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/* $OpenBSD: tls_content.c,v 1.2 2022/11/11 17:15:27 jsing Exp $ */
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/*
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* Copyright (c) 2020 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "tls_content.h"
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/* Content from a TLS record. */
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struct tls_content {
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uint8_t type;
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uint16_t epoch;
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const uint8_t *data;
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size_t data_len;
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CBS cbs;
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};
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struct tls_content *
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tls_content_new(void)
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{
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return calloc(1, sizeof(struct tls_content));
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}
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void
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tls_content_clear(struct tls_content *content)
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{
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freezero((void *)content->data, content->data_len);
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memset(content, 0, sizeof(*content));
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}
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void
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tls_content_free(struct tls_content *content)
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{
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if (content == NULL)
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return;
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tls_content_clear(content);
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freezero(content, sizeof(struct tls_content));
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}
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CBS *
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tls_content_cbs(struct tls_content *content)
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{
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return &content->cbs;
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}
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int
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tls_content_equal(struct tls_content *content, const uint8_t *buf, size_t n)
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{
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return CBS_mem_equal(&content->cbs, buf, n);
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}
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size_t
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tls_content_remaining(struct tls_content *content)
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{
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return CBS_len(&content->cbs);
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}
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uint8_t
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tls_content_type(struct tls_content *content)
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{
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return content->type;
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}
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int
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tls_content_dup_data(struct tls_content *content, uint8_t type,
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const uint8_t *data, size_t data_len)
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{
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uint8_t *dup;
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if ((dup = calloc(1, data_len)) == NULL)
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return 0;
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memcpy(dup, data, data_len);
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tls_content_set_data(content, type, dup, data_len);
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return 1;
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}
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uint16_t
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tls_content_epoch(struct tls_content *content)
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{
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return content->epoch;
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}
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void
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tls_content_set_epoch(struct tls_content *content, uint16_t epoch)
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{
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content->epoch = epoch;
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}
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void
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tls_content_set_data(struct tls_content *content, uint8_t type,
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const uint8_t *data, size_t data_len)
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{
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tls_content_clear(content);
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content->type = type;
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content->data = data;
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content->data_len = data_len;
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CBS_init(&content->cbs, content->data, content->data_len);
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}
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int
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tls_content_set_bounds(struct tls_content *content, size_t offset, size_t len)
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{
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size_t content_len;
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content_len = offset + len;
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if (content_len < len)
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return 0;
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if (content_len > content->data_len)
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return 0;
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CBS_init(&content->cbs, content->data, content_len);
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return CBS_skip(&content->cbs, offset);
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}
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static ssize_t
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tls_content_read_internal(struct tls_content *content, uint8_t *buf, size_t n,
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int peek)
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{
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if (n > CBS_len(&content->cbs))
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n = CBS_len(&content->cbs);
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/* XXX - CBS_memcpy? CBS_copy_bytes? */
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memcpy(buf, CBS_data(&content->cbs), n);
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if (!peek) {
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if (!CBS_skip(&content->cbs, n))
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return -1;
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}
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return n;
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}
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ssize_t
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tls_content_peek(struct tls_content *content, uint8_t *buf, size_t n)
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{
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return tls_content_read_internal(content, buf, n, 1);
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}
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ssize_t
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tls_content_read(struct tls_content *content, uint8_t *buf, size_t n)
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{
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return tls_content_read_internal(content, buf, n, 0);
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}
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