IABSD.fr/src/lib/libssl/tls_content.c

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• Author : jsing
  Date : 2022-11-11 17:15:26
  Hash : ee4250f6
  Message : Convert the legacy TLS stack to tls_content. This converts the legacy TLS stack to tls_content - records are now opened into a tls_content structure, rather than being written back into the same buffer that the sealed record was read into. This will allow for further clean up of the legacy record layer. ok tb@

• lib/libssl/tls_content.c

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