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git.ipfire.org Git - thirdparty/openssl.git/blob - ssl/packet_locl.h
2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #ifndef HEADER_PACKET_LOCL_H
11 # define HEADER_PACKET_LOCL_H
14 # include <openssl/bn.h>
15 # include <openssl/buffer.h>
16 # include <openssl/crypto.h>
17 # include <openssl/e_os2.h>
19 # include "internal/numbers.h"
26 /* Pointer to where we are currently reading from */
27 const unsigned char *curr
;
28 /* Number of bytes remaining */
32 /* Internal unchecked shorthand; don't use outside this file. */
33 static ossl_inline
void packet_forward(PACKET
*pkt
, size_t len
)
36 pkt
->remaining
-= len
;
40 * Returns the number of bytes remaining to be read in the PACKET
42 static ossl_inline
size_t PACKET_remaining(const PACKET
*pkt
)
44 return pkt
->remaining
;
48 * Returns a pointer to the first byte after the packet data.
49 * Useful for integrating with non-PACKET parsing code.
50 * Specifically, we use PACKET_end() to verify that a d2i_... call
51 * has consumed the entire packet contents.
53 static ossl_inline
const unsigned char *PACKET_end(const PACKET
*pkt
)
55 return pkt
->curr
+ pkt
->remaining
;
59 * Returns a pointer to the PACKET's current position.
60 * For use in non-PACKETized APIs.
62 static ossl_inline
const unsigned char *PACKET_data(const PACKET
*pkt
)
68 * Initialise a PACKET with |len| bytes held in |buf|. This does not make a
69 * copy of the data so |buf| must be present for the whole time that the PACKET
72 __owur
static ossl_inline
int PACKET_buf_init(PACKET
*pkt
,
73 const unsigned char *buf
,
76 /* Sanity check for negative values. */
77 if (len
> (size_t)(SIZE_MAX
/ 2))
85 /* Initialize a PACKET to hold zero bytes. */
86 static ossl_inline
void PACKET_null_init(PACKET
*pkt
)
93 * Returns 1 if the packet has length |num| and its contents equal the |num|
94 * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal).
95 * If lengths are equal, performs the comparison in constant time.
97 __owur
static ossl_inline
int PACKET_equal(const PACKET
*pkt
, const void *ptr
,
100 if (PACKET_remaining(pkt
) != num
)
102 return CRYPTO_memcmp(pkt
->curr
, ptr
, num
) == 0;
106 * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|.
107 * Data is not copied: the |subpkt| packet will share its underlying buffer with
108 * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
110 __owur
static ossl_inline
int PACKET_peek_sub_packet(const PACKET
*pkt
,
111 PACKET
*subpkt
, size_t len
)
113 if (PACKET_remaining(pkt
) < len
)
116 return PACKET_buf_init(subpkt
, pkt
->curr
, len
);
120 * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not
121 * copied: the |subpkt| packet will share its underlying buffer with the
122 * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
124 __owur
static ossl_inline
int PACKET_get_sub_packet(PACKET
*pkt
,
125 PACKET
*subpkt
, size_t len
)
127 if (!PACKET_peek_sub_packet(pkt
, subpkt
, len
))
130 packet_forward(pkt
, len
);
136 * Peek ahead at 2 bytes in network order from |pkt| and store the value in
139 __owur
static ossl_inline
int PACKET_peek_net_2(const PACKET
*pkt
,
142 if (PACKET_remaining(pkt
) < 2)
145 *data
= ((unsigned int)(*pkt
->curr
)) << 8;
146 *data
|= *(pkt
->curr
+ 1);
151 /* Equivalent of n2s */
152 /* Get 2 bytes in network order from |pkt| and store the value in |*data| */
153 __owur
static ossl_inline
int PACKET_get_net_2(PACKET
*pkt
, unsigned int *data
)
155 if (!PACKET_peek_net_2(pkt
, data
))
158 packet_forward(pkt
, 2);
164 * Peek ahead at 3 bytes in network order from |pkt| and store the value in
167 __owur
static ossl_inline
int PACKET_peek_net_3(const PACKET
*pkt
,
170 if (PACKET_remaining(pkt
) < 3)
173 *data
= ((unsigned long)(*pkt
->curr
)) << 16;
174 *data
|= ((unsigned long)(*(pkt
->curr
+ 1))) << 8;
175 *data
|= *(pkt
->curr
+ 2);
180 /* Equivalent of n2l3 */
181 /* Get 3 bytes in network order from |pkt| and store the value in |*data| */
182 __owur
static ossl_inline
int PACKET_get_net_3(PACKET
*pkt
, unsigned long *data
)
184 if (!PACKET_peek_net_3(pkt
, data
))
187 packet_forward(pkt
, 3);
193 * Peek ahead at 4 bytes in network order from |pkt| and store the value in
196 __owur
static ossl_inline
int PACKET_peek_net_4(const PACKET
*pkt
,
199 if (PACKET_remaining(pkt
) < 4)
202 *data
= ((unsigned long)(*pkt
->curr
)) << 24;
203 *data
|= ((unsigned long)(*(pkt
->curr
+ 1))) << 16;
204 *data
|= ((unsigned long)(*(pkt
->curr
+ 2))) << 8;
205 *data
|= *(pkt
->curr
+ 3);
210 /* Equivalent of n2l */
211 /* Get 4 bytes in network order from |pkt| and store the value in |*data| */
212 __owur
static ossl_inline
int PACKET_get_net_4(PACKET
*pkt
, unsigned long *data
)
214 if (!PACKET_peek_net_4(pkt
, data
))
217 packet_forward(pkt
, 4);
222 /* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
223 __owur
static ossl_inline
int PACKET_peek_1(const PACKET
*pkt
,
226 if (!PACKET_remaining(pkt
))
234 /* Get 1 byte from |pkt| and store the value in |*data| */
235 __owur
static ossl_inline
int PACKET_get_1(PACKET
*pkt
, unsigned int *data
)
237 if (!PACKET_peek_1(pkt
, data
))
240 packet_forward(pkt
, 1);
246 * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
249 __owur
static ossl_inline
int PACKET_peek_4(const PACKET
*pkt
,
252 if (PACKET_remaining(pkt
) < 4)
256 *data
|= ((unsigned long)(*(pkt
->curr
+ 1))) << 8;
257 *data
|= ((unsigned long)(*(pkt
->curr
+ 2))) << 16;
258 *data
|= ((unsigned long)(*(pkt
->curr
+ 3))) << 24;
263 /* Equivalent of c2l */
265 * Get 4 bytes in reverse network order from |pkt| and store the value in
268 __owur
static ossl_inline
int PACKET_get_4(PACKET
*pkt
, unsigned long *data
)
270 if (!PACKET_peek_4(pkt
, data
))
273 packet_forward(pkt
, 4);
279 * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in
280 * |*data|. This just points at the underlying buffer that |pkt| is using. The
281 * caller should not free this data directly (it will be freed when the
282 * underlying buffer gets freed
284 __owur
static ossl_inline
int PACKET_peek_bytes(const PACKET
*pkt
,
285 const unsigned char **data
,
288 if (PACKET_remaining(pkt
) < len
)
297 * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This
298 * just points at the underlying buffer that |pkt| is using. The caller should
299 * not free this data directly (it will be freed when the underlying buffer gets
302 __owur
static ossl_inline
int PACKET_get_bytes(PACKET
*pkt
,
303 const unsigned char **data
,
306 if (!PACKET_peek_bytes(pkt
, data
, len
))
309 packet_forward(pkt
, len
);
314 /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */
315 __owur
static ossl_inline
int PACKET_peek_copy_bytes(const PACKET
*pkt
,
319 if (PACKET_remaining(pkt
) < len
)
322 memcpy(data
, pkt
->curr
, len
);
328 * Read |len| bytes from |pkt| and copy them to |data|.
329 * The caller is responsible for ensuring that |data| can hold |len| bytes.
331 __owur
static ossl_inline
int PACKET_copy_bytes(PACKET
*pkt
,
332 unsigned char *data
, size_t len
)
334 if (!PACKET_peek_copy_bytes(pkt
, data
, len
))
337 packet_forward(pkt
, len
);
343 * Copy packet data to |dest|, and set |len| to the number of copied bytes.
344 * If the packet has more than |dest_len| bytes, nothing is copied.
345 * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise.
346 * Does not forward PACKET position (because it is typically the last thing
347 * done with a given PACKET).
349 __owur
static ossl_inline
int PACKET_copy_all(const PACKET
*pkt
,
351 size_t dest_len
, size_t *len
)
353 if (PACKET_remaining(pkt
) > dest_len
) {
357 *len
= pkt
->remaining
;
358 memcpy(dest
, pkt
->curr
, pkt
->remaining
);
363 * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the
364 * result in |*data|, and the length in |len|.
365 * If |*data| is not NULL, the old data is OPENSSL_free'd.
366 * If the packet is empty, or malloc fails, |*data| will be set to NULL.
367 * Returns 1 if the malloc succeeds and 0 otherwise.
368 * Does not forward PACKET position (because it is typically the last thing
369 * done with a given PACKET).
371 __owur
static ossl_inline
int PACKET_memdup(const PACKET
*pkt
,
372 unsigned char **data
, size_t *len
)
380 length
= PACKET_remaining(pkt
);
385 *data
= OPENSSL_memdup(pkt
->curr
, length
);
394 * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated
395 * buffer. Store a pointer to the result in |*data|.
396 * If |*data| is not NULL, the old data is OPENSSL_free'd.
397 * If the data in |pkt| does not contain a NUL-byte, the entire data is
398 * copied and NUL-terminated.
399 * Returns 1 if the malloc succeeds and 0 otherwise.
400 * Does not forward PACKET position (because it is typically the last thing done
401 * with a given PACKET).
403 __owur
static ossl_inline
int PACKET_strndup(const PACKET
*pkt
, char **data
)
407 /* This will succeed on an empty packet, unless pkt->curr == NULL. */
408 *data
= OPENSSL_strndup((const char *)pkt
->curr
, PACKET_remaining(pkt
));
409 return (*data
!= NULL
);
412 /* Returns 1 if |pkt| contains at least one 0-byte, 0 otherwise. */
413 static ossl_inline
int PACKET_contains_zero_byte(const PACKET
*pkt
)
415 return memchr(pkt
->curr
, 0, pkt
->remaining
) != NULL
;
418 /* Move the current reading position forward |len| bytes */
419 __owur
static ossl_inline
int PACKET_forward(PACKET
*pkt
, size_t len
)
421 if (PACKET_remaining(pkt
) < len
)
424 packet_forward(pkt
, len
);
430 * Reads a variable-length vector prefixed with a one-byte length, and stores
431 * the contents in |subpkt|. |pkt| can equal |subpkt|.
432 * Data is not copied: the |subpkt| packet will share its underlying buffer with
433 * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
434 * Upon failure, the original |pkt| and |subpkt| are not modified.
436 __owur
static ossl_inline
int PACKET_get_length_prefixed_1(PACKET
*pkt
,
440 const unsigned char *data
;
442 if (!PACKET_get_1(&tmp
, &length
) ||
443 !PACKET_get_bytes(&tmp
, &data
, (size_t)length
)) {
449 subpkt
->remaining
= length
;
455 * Like PACKET_get_length_prefixed_1, but additionally, fails when there are
456 * leftover bytes in |pkt|.
458 __owur
static ossl_inline
int PACKET_as_length_prefixed_1(PACKET
*pkt
,
462 const unsigned char *data
;
464 if (!PACKET_get_1(&tmp
, &length
) ||
465 !PACKET_get_bytes(&tmp
, &data
, (size_t)length
) ||
466 PACKET_remaining(&tmp
) != 0) {
472 subpkt
->remaining
= length
;
478 * Reads a variable-length vector prefixed with a two-byte length, and stores
479 * the contents in |subpkt|. |pkt| can equal |subpkt|.
480 * Data is not copied: the |subpkt| packet will share its underlying buffer with
481 * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
482 * Upon failure, the original |pkt| and |subpkt| are not modified.
484 __owur
static ossl_inline
int PACKET_get_length_prefixed_2(PACKET
*pkt
,
488 const unsigned char *data
;
491 if (!PACKET_get_net_2(&tmp
, &length
) ||
492 !PACKET_get_bytes(&tmp
, &data
, (size_t)length
)) {
498 subpkt
->remaining
= length
;
504 * Like PACKET_get_length_prefixed_2, but additionally, fails when there are
505 * leftover bytes in |pkt|.
507 __owur
static ossl_inline
int PACKET_as_length_prefixed_2(PACKET
*pkt
,
511 const unsigned char *data
;
514 if (!PACKET_get_net_2(&tmp
, &length
) ||
515 !PACKET_get_bytes(&tmp
, &data
, (size_t)length
) ||
516 PACKET_remaining(&tmp
) != 0) {
522 subpkt
->remaining
= length
;
528 * Reads a variable-length vector prefixed with a three-byte length, and stores
529 * the contents in |subpkt|. |pkt| can equal |subpkt|.
530 * Data is not copied: the |subpkt| packet will share its underlying buffer with
531 * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
532 * Upon failure, the original |pkt| and |subpkt| are not modified.
534 __owur
static ossl_inline
int PACKET_get_length_prefixed_3(PACKET
*pkt
,
537 unsigned long length
;
538 const unsigned char *data
;
540 if (!PACKET_get_net_3(&tmp
, &length
) ||
541 !PACKET_get_bytes(&tmp
, &data
, (size_t)length
)) {
547 subpkt
->remaining
= length
;
552 /* Writeable packets */
554 typedef struct wpacket_sub WPACKET_SUB
;
556 /* The parent WPACKET_SUB if we have one or NULL otherwise */
560 * Offset into the buffer where the length of this WPACKET goes. We use an
561 * offset in case the buffer grows and gets reallocated.
565 /* Number of bytes in the packet_len or 0 if we don't write the length */
568 /* Number of bytes written to the buf prior to this packet starting */
571 /* Flags for this sub-packet */
575 typedef struct wpacket_st WPACKET
;
577 /* The buffer where we store the output data */
581 * Offset into the buffer where we are currently writing. We use an offset
582 * in case the buffer grows and gets reallocated.
586 /* Number of bytes written so far */
589 /* Maximum number of bytes we will allow to be written to this WPACKET */
592 /* Our sub-packets (always at least one if not finished) */
599 #define WPACKET_FLAGS_NONE 0
601 /* Error on WPACKET_close() if no data written to the WPACKET */
602 #define WPACKET_FLAGS_NON_ZERO_LENGTH 1
605 * Abandon all changes on WPACKET_close() if no data written to the WPACKET,
606 * i.e. this does not write out a zero packet length
608 #define WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH 2
612 * Initialise a WPACKET with the buffer in |buf|. The buffer must exist
613 * for the whole time that the WPACKET is being used. Additionally |lenbytes| of
614 * data is preallocated at the start of the buffer to store the length of the
615 * WPACKET once we know it.
617 int WPACKET_init_len(WPACKET
*pkt
, BUF_MEM
*buf
, size_t lenbytes
);
620 * Same as WPACKET_init_len except there is no preallocation of the WPACKET
623 int WPACKET_init(WPACKET
*pkt
, BUF_MEM
*buf
);
626 * Set the flags to be applied to the current sub-packet
628 int WPACKET_set_flags(WPACKET
*pkt
, unsigned int flags
);
631 * Closes the most recent sub-packet. It also writes out the length of the
632 * packet to the required location (normally the start of the WPACKET) if
633 * appropriate. The top level WPACKET should be closed using WPACKET_finish()
634 * instead of this function.
636 int WPACKET_close(WPACKET
*pkt
);
639 * The same as WPACKET_close() but only for the top most WPACKET. Additionally
640 * frees memory resources for this WPACKET.
642 int WPACKET_finish(WPACKET
*pkt
);
645 * Initialise a new sub-packet. Additionally |lenbytes| of data is preallocated
646 * at the start of the sub-packet to store its length once we know it. Don't
647 * call this directly. Use the convenience macros below instead.
649 int WPACKET_start_sub_packet_len__(WPACKET
*pkt
, size_t lenbytes
);
652 * Convenience macros for calling WPACKET_start_sub_packet_len with different
655 #define WPACKET_start_sub_packet_u8(pkt) \
656 WPACKET_start_sub_packet_len__((pkt), 1)
657 #define WPACKET_start_sub_packet_u16(pkt) \
658 WPACKET_start_sub_packet_len__((pkt), 2)
659 #define WPACKET_start_sub_packet_u24(pkt) \
660 WPACKET_start_sub_packet_len__((pkt), 3)
661 #define WPACKET_start_sub_packet_u32(pkt) \
662 WPACKET_start_sub_packet_len__((pkt), 4)
665 * Same as WPACKET_start_sub_packet_len__() except no bytes are pre-allocated
666 * for the sub-packet length.
668 int WPACKET_start_sub_packet(WPACKET
*pkt
);
671 * Allocate bytes in the WPACKET for the output. This reserves the bytes
672 * and counts them as "written", but doesn't actually do the writing. A pointer
673 * to the allocated bytes is stored in |*allocbytes|.
675 int WPACKET_allocate_bytes(WPACKET
*pkt
, size_t bytes
,
676 unsigned char **allocbytes
);
679 * The same as WPACKET_allocate_bytes() except additionally a new sub-packet is
680 * started for the allocated bytes, and then closed immediately afterwards. The
681 * number of length bytes for the sub-packet is in |lenbytes|. Don't call this
682 * directly. Use the convenience macros below instead.
684 int WPACKET_sub_allocate_bytes__(WPACKET
*pkt
, size_t len
,
685 unsigned char **allocbytes
, size_t lenbytes
);
688 * Convenience macros for calling WPACKET_sub_allocate_bytes with different
691 #define WPACKET_sub_allocate_bytes_u8(pkt, len, bytes) \
692 WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 1)
693 #define WPACKET_sub_allocate_bytes_u16(pkt, len, bytes) \
694 WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 2)
695 #define WPACKET_sub_allocate_bytes_u24(pkt, len, bytes) \
696 WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 3)
697 #define WPACKET_sub_allocate_bytes_u32(pkt, len, bytes) \
698 WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 4)
701 * Write the value stored in |val| into the WPACKET. The value will consume
702 * |bytes| amount of storage. An error will occur if |val| cannot be
703 * accommodated in |bytes| storage, e.g. attempting to write the value 256 into
706 int WPACKET_put_bytes(WPACKET
*pkt
, unsigned int val
, size_t bytes
);
708 /* Set a maximum size that we will not allow the WPACKET to grow beyond */
709 int WPACKET_set_max_size(WPACKET
*pkt
, size_t maxsize
);
711 /* Copy |len| bytes of data from |*src| into the WPACKET. */
712 int WPACKET_memcpy(WPACKET
*pkt
, const void *src
, size_t len
);
715 * Copy |len| bytes of data from |*src| into the WPACKET and prefix with its
716 * length (consuming |lenbytes| of data for the length). Don't call this
717 * directly. Use the convenience macros below instead.
719 int WPACKET_sub_memcpy__(WPACKET
*pkt
, const void *src
, size_t len
,
722 /* Convenience macros for calling WPACKET_sub_memcpy with different lengths */
723 #define WPACKET_sub_memcpy_u8(pkt, src, len) \
724 WPACKET_sub_memcpy__((pkt), (src), (len), 1)
725 #define WPACKET_sub_memcpy_u16(pkt, src, len) \
726 WPACKET_sub_memcpy__((pkt), (src), (len), 2)
727 #define WPACKET_sub_memcpy_bytes_u24(pkt, src, len) \
728 WPACKET_sub_memcpy__((pkt), (src), (len), 3)
729 #define WPACKET_sub_memcpy_bytes_u32(pkt, src, len) \
730 WPACKET_sub_memcpy__((pkt), (src), (len), 4)
733 * Return the total number of bytes written so far to the underlying buffer
734 * including any storage allocated for length bytes
736 int WPACKET_get_total_written(WPACKET
*pkt
, size_t *written
);
739 * Returns the length of the current sub-packet. This excludes any bytes
740 * allocated for the length itself.
742 int WPACKET_get_length(WPACKET
*pkt
, size_t *len
);
744 /* Release resources in a WPACKET if a failure has occurred. */
745 void WPACKET_cleanup(WPACKET
*pkt
);
751 #endif /* HEADER_PACKET_LOCL_H */