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openssl/ssl/packet_locl.h
Emilia Kasper b698174493 constify PACKET 
PACKET contents should be read-only. To achieve this, also
- constify two user callbacks
- constify BUF_reverse.

Reviewed-by: Rich Salz <rsalz@openssl.org>
2016-02-01 16:21:57 +01:00

545 lines
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/*
* Written by Matt Caswell for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2015 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#ifndef HEADER_PACKET_LOCL_H
# define HEADER_PACKET_LOCL_H
# include <string.h>
# include <openssl/bn.h>
# include <openssl/buffer.h>
# include <openssl/crypto.h>
# include <openssl/e_os2.h>
# include "internal/numbers.h"
# ifdef __cplusplus
extern "C" {
# endif
typedef struct {
/* Pointer to where we are currently reading from */
const unsigned char *curr;
/* Number of bytes remaining */
size_t remaining;
} PACKET;
/* Internal unchecked shorthand; don't use outside this file. */
static ossl_inline void packet_forward(PACKET *pkt, size_t len)
{
pkt->curr += len;
pkt->remaining -= len;
}
/*
* Returns the number of bytes remaining to be read in the PACKET
*/
static ossl_inline size_t PACKET_remaining(const PACKET *pkt)
{
return pkt->remaining;
}
/*
* Returns a pointer to the PACKET's current position.
* For use in non-PACKETized APIs.
*/
static ossl_inline const unsigned char *PACKET_data(const PACKET *pkt)
{
return pkt->curr;
}
/*
* Initialise a PACKET with |len| bytes held in |buf|. This does not make a
* copy of the data so |buf| must be present for the whole time that the PACKET
* is being used.
*/
__owur static ossl_inline int PACKET_buf_init(PACKET *pkt,
const unsigned char *buf,
size_t len)
{
/* Sanity check for negative values. */
if (len > (size_t)(SIZE_MAX / 2))
return 0;
pkt->curr = buf;
pkt->remaining = len;
return 1;
}
/* Initialize a PACKET to hold zero bytes. */
static ossl_inline void PACKET_null_init(PACKET *pkt)
{
pkt->curr = NULL;
pkt->remaining = 0;
}
/*
* Returns 1 if the packet has length |num| and its contents equal the |num|
* bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal).
* If lengths are equal, performs the comparison in constant time.
*/
__owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr,
size_t num)
{
if (PACKET_remaining(pkt) != num)
return 0;
return CRYPTO_memcmp(pkt->curr, ptr, num) == 0;
}
/*
* Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|.
* Data is not copied: the |subpkt| packet will share its underlying buffer with
* the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
*/
__owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt,
PACKET *subpkt,
size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
return PACKET_buf_init(subpkt, pkt->curr, len);
}
/*
* Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not
* copied: the |subpkt| packet will share its underlying buffer with the
* original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
*/
__owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt,
PACKET *subpkt,
size_t len)
{
if (!PACKET_peek_sub_packet(pkt, subpkt, len))
return 0;
packet_forward(pkt, len);
return 1;
}
/*
* Peek ahead at 2 bytes in network order from |pkt| and store the value in
* |*data|
*/
__owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt,
unsigned int *data)
{
if (PACKET_remaining(pkt) < 2)
return 0;
*data = ((unsigned int)(*pkt->curr)) << 8;
*data |= *(pkt->curr + 1);
return 1;
}
/* Equivalent of n2s */
/* Get 2 bytes in network order from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_get_net_2(PACKET *pkt,
unsigned int *data)
{
if (!PACKET_peek_net_2(pkt, data))
return 0;
packet_forward(pkt, 2);
return 1;
}
/*
* Peek ahead at 3 bytes in network order from |pkt| and store the value in
* |*data|
*/
__owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt,
unsigned long *data)
{
if (PACKET_remaining(pkt) < 3)
return 0;
*data = ((unsigned long)(*pkt->curr)) << 16;
*data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
*data |= *(pkt->curr + 2);
return 1;
}
/* Equivalent of n2l3 */
/* Get 3 bytes in network order from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_get_net_3(PACKET *pkt,
unsigned long *data)
{
if (!PACKET_peek_net_3(pkt, data))
return 0;
packet_forward(pkt, 3);
return 1;
}
/*
* Peek ahead at 4 bytes in network order from |pkt| and store the value in
* |*data|
*/
__owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt,
unsigned long *data)
{
if (PACKET_remaining(pkt) < 4)
return 0;
*data = ((unsigned long)(*pkt->curr)) << 24;
*data |= ((unsigned long)(*(pkt->curr + 1))) << 16;
*data |= ((unsigned long)(*(pkt->curr + 2))) << 8;
*data |= *(pkt->curr + 3);
return 1;
}
/* Equivalent of n2l */
/* Get 4 bytes in network order from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_get_net_4(PACKET *pkt,
unsigned long *data)
{
if (!PACKET_peek_net_4(pkt, data))
return 0;
packet_forward(pkt, 4);
return 1;
}
/* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_peek_1(const PACKET *pkt,
unsigned int *data)
{
if (!PACKET_remaining(pkt))
return 0;
*data = *pkt->curr;
return 1;
}
/* Get 1 byte from |pkt| and store the value in |*data| */
__owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data)
{
if (!PACKET_peek_1(pkt, data))
return 0;
packet_forward(pkt, 1);
return 1;
}
/*
* Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
* in |*data|
*/
__owur static ossl_inline int PACKET_peek_4(const PACKET *pkt,
unsigned long *data)
{
if (PACKET_remaining(pkt) < 4)
return 0;
*data = *pkt->curr;
*data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
*data |= ((unsigned long)(*(pkt->curr + 2))) << 16;
*data |= ((unsigned long)(*(pkt->curr + 3))) << 24;
return 1;
}
/* Equivalent of c2l */
/*
* Get 4 bytes in reverse network order from |pkt| and store the value in
* |*data|
*/
__owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data)
{
if (!PACKET_peek_4(pkt, data))
return 0;
packet_forward(pkt, 4);
return 1;
}
/*
* Peek ahead at |len| bytes from the |pkt| and store a pointer to them in
* |*data|. This just points at the underlying buffer that |pkt| is using. The
* caller should not free this data directly (it will be freed when the
* underlying buffer gets freed
*/
__owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt,
const unsigned char **data,
size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
*data = pkt->curr;
return 1;
}
/*
* Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This
* just points at the underlying buffer that |pkt| is using. The caller should
* not free this data directly (it will be freed when the underlying buffer gets
* freed
*/
__owur static ossl_inline int PACKET_get_bytes(PACKET *pkt,
const unsigned char **data,
size_t len)
{
if (!PACKET_peek_bytes(pkt, data, len))
return 0;
packet_forward(pkt, len);
return 1;
}
/* Peek ahead at |len| bytes from |pkt| and copy them to |data| */
__owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt,
unsigned char *data,
size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
memcpy(data, pkt->curr, len);
return 1;
}
/*
* Read |len| bytes from |pkt| and copy them to |data|.
* The caller is responsible for ensuring that |data| can hold |len| bytes.
*/
__owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt,
unsigned char *data,
size_t len)
{
if (!PACKET_peek_copy_bytes(pkt, data, len))
return 0;
packet_forward(pkt, len);
return 1;
}
/*
* Copy packet data to |dest|, and set |len| to the number of copied bytes.
* If the packet has more than |dest_len| bytes, nothing is copied.
* Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise.
* Does not forward PACKET position (because it is typically the last thing
* done with a given PACKET).
*/
__owur static ossl_inline int PACKET_copy_all(const PACKET *pkt,
unsigned char *dest,
size_t dest_len, size_t *len)
{
if (PACKET_remaining(pkt) > dest_len) {
*len = 0;
return 0;
}
*len = pkt->remaining;
memcpy(dest, pkt->curr, pkt->remaining);
return 1;
}
/*
* Copy |pkt| bytes to a newly allocated buffer and store a pointer to the
* result in |*data|, and the length in |len|.
* If |*data| is not NULL, the old data is OPENSSL_free'd.
* If the packet is empty, or malloc fails, |*data| will be set to NULL.
* Returns 1 if the malloc succeeds and 0 otherwise.
* Does not forward PACKET position (because it is typically the last thing
* done with a given PACKET).
*/
__owur static ossl_inline int PACKET_memdup(const PACKET *pkt,
unsigned char **data, size_t *len)
{
size_t length;
OPENSSL_free(*data);
*data = NULL;
*len = 0;
length = PACKET_remaining(pkt);
if (length == 0)
return 1;
*data = OPENSSL_memdup(pkt->curr, length);
if (*data == NULL)
return 0;
*len = length;
return 1;
}
/*
* Read a C string from |pkt| and copy to a newly allocated, NUL-terminated
* buffer. Store a pointer to the result in |*data|.
* If |*data| is not NULL, the old data is OPENSSL_free'd.
* If the data in |pkt| does not contain a NUL-byte, the entire data is
* copied and NUL-terminated.
* Returns 1 if the malloc succeeds and 0 otherwise.
* Does not forward PACKET position (because it is typically the last thing done
* with a given PACKET).
*/
__owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data)
{
OPENSSL_free(*data);
/* This will succeed on an empty packet, unless pkt->curr == NULL. */
*data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt));
return (*data != NULL);
}
/* Move the current reading position forward |len| bytes */
__owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
packet_forward(pkt, len);
return 1;
}
/*
* Reads a variable-length vector prefixed with a one-byte length, and stores
* the contents in |subpkt|. |pkt| can equal |subpkt|.
* Data is not copied: the |subpkt| packet will share its underlying buffer with
* the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
* Upon failure, the original |pkt| and |subpkt| are not modified.
*/
__owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt,
PACKET *subpkt)
{
unsigned int length;
const unsigned char *data;
PACKET tmp = *pkt;
if (!PACKET_get_1(&tmp, &length) ||
!PACKET_get_bytes(&tmp, &data, (size_t)length)) {
return 0;
}
*pkt = tmp;
subpkt->curr = data;
subpkt->remaining = length;
return 1;
}
/*
* Reads a variable-length vector prefixed with a two-byte length, and stores
* the contents in |subpkt|. |pkt| can equal |subpkt|.
* Data is not copied: the |subpkt| packet will share its underlying buffer with
* the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
* Upon failure, the original |pkt| and |subpkt| are not modified.
*/
__owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt,
PACKET *subpkt)
{
unsigned int length;
const unsigned char *data;
PACKET tmp = *pkt;
if (!PACKET_get_net_2(&tmp, &length) ||
!PACKET_get_bytes(&tmp, &data, (size_t)length)) {
return 0;
}
*pkt = tmp;
subpkt->curr = data;
subpkt->remaining = length;
return 1;
}
/*
* Reads a variable-length vector prefixed with a three-byte length, and stores
* the contents in |subpkt|. |pkt| can equal |subpkt|.
* Data is not copied: the |subpkt| packet will share its underlying buffer with
* the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
* Upon failure, the original |pkt| and |subpkt| are not modified.
*/
__owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt,
PACKET *subpkt)
{
unsigned long length;
const unsigned char *data;
PACKET tmp = *pkt;
if (!PACKET_get_net_3(&tmp, &length) ||
!PACKET_get_bytes(&tmp, &data, (size_t)length)) {
return 0;
}
*pkt = tmp;
subpkt->curr = data;
subpkt->remaining = length;
return 1;
}
# ifdef __cplusplus
}
# endif
#endif /* HEADER_PACKET_LOCL_H */
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