X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fpacket_locl.h;h=67b49994f7d27c911a6adfd72c0b74a5e9b37c43;hp=daef69e30e8dd1078e9947ebebb363e0b8ff982d;hb=1f5b44e943d911c3d0bf1445a6dab60798a66408;hpb=de451856f08364ad6c6659b6eacbe820edc2aab9 diff --git a/ssl/packet_locl.h b/ssl/packet_locl.h index daef69e30e..67b49994f7 100644 --- a/ssl/packet_locl.h +++ b/ssl/packet_locl.h @@ -160,6 +160,18 @@ __owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data) return 1; } +/* Same as PACKET_get_net_2() but for a size_t */ +__owur static ossl_inline int PACKET_get_net_2_len(PACKET *pkt, size_t *data) +{ + unsigned int i; + int ret = PACKET_get_net_2(pkt, &i); + + if (ret) + *data = (size_t)i; + + return ret; +} + /* * Peek ahead at 3 bytes in network order from |pkt| and store the value in * |*data| @@ -189,6 +201,18 @@ __owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data) return 1; } +/* Same as PACKET_get_net_3() but for a size_t */ +__owur static ossl_inline int PACKET_get_net_3_len(PACKET *pkt, size_t *data) +{ + unsigned long i; + int ret = PACKET_get_net_3(pkt, &i); + + if (ret) + *data = (size_t)i; + + return ret; +} + /* * Peek ahead at 4 bytes in network order from |pkt| and store the value in * |*data| @@ -219,6 +243,18 @@ __owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data) return 1; } +/* Same as PACKET_get_net_4() but for a size_t */ +__owur static ossl_inline int PACKET_get_net_4_len(PACKET *pkt, size_t *data) +{ + unsigned long i; + int ret = PACKET_get_net_4(pkt, &i); + + if (ret) + *data = (size_t)i; + + return ret; +} + /* 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) @@ -242,6 +278,18 @@ __owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data) return 1; } +/* Same as PACKET_get_1() but for a size_t */ +__owur static ossl_inline int PACKET_get_1_len(PACKET *pkt, size_t *data) +{ + unsigned int i; + int ret = PACKET_get_1(pkt, &i); + + if (ret) + *data = (size_t)i; + + return ret; +} + /* * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value * in |*data| @@ -577,6 +625,9 @@ struct wpacket_st { /* The buffer where we store the output data */ BUF_MEM *buf; + /* Fixed sized buffer which can be used as an alternative to buf */ + unsigned char *staticbuf; + /* * Offset into the buffer where we are currently writing. We use an offset * in case the buffer grows and gets reallocated. @@ -622,6 +673,13 @@ int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes); */ int WPACKET_init(WPACKET *pkt, BUF_MEM *buf); +/* + * Same as WPACKET_init_len except we do not use a growable BUF_MEM structure. + * A fixed buffer of memory |buf| of size |len| is used instead. A failure will + * occur if you attempt to write beyond the end of the buffer + */ +int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len, + size_t lenbytes); /* * Set the flags to be applied to the current sub-packet */ @@ -641,46 +699,133 @@ int WPACKET_close(WPACKET *pkt); */ int WPACKET_finish(WPACKET *pkt); +/* + * Iterate through all the sub-packets and write out their lengths as if they + * were being closed. The lengths will be overwritten with the final lengths + * when the sub-packets are eventually closed (which may be different if more + * data is added to the WPACKET). This function fails if a sub-packet is of 0 + * length and WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH is set. + */ +int WPACKET_fill_lengths(WPACKET *pkt); + /* * Initialise a new sub-packet. Additionally |lenbytes| of data is preallocated - * at the start of the sub-packet to store its length once we know it. + * at the start of the sub-packet to store its length once we know it. Don't + * call this directly. Use the convenience macros below instead. */ -int WPACKET_start_sub_packet_len(WPACKET *pkt, size_t lenbytes); +int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes); /* * Convenience macros for calling WPACKET_start_sub_packet_len with different * lengths */ #define WPACKET_start_sub_packet_u8(pkt) \ - WPACKET_start_sub_packet_len((pkt), 1) + WPACKET_start_sub_packet_len__((pkt), 1) #define WPACKET_start_sub_packet_u16(pkt) \ - WPACKET_start_sub_packet_len((pkt), 2) + WPACKET_start_sub_packet_len__((pkt), 2) #define WPACKET_start_sub_packet_u24(pkt) \ - WPACKET_start_sub_packet_len((pkt), 3) + WPACKET_start_sub_packet_len__((pkt), 3) #define WPACKET_start_sub_packet_u32(pkt) \ - WPACKET_start_sub_packet_len((pkt), 4) + WPACKET_start_sub_packet_len__((pkt), 4) /* - * Same as WPACKET_start_sub_packet_len() except no bytes are pre-allocated for - * the sub-packet length. + * Same as WPACKET_start_sub_packet_len__() except no bytes are pre-allocated + * for the sub-packet length. */ int WPACKET_start_sub_packet(WPACKET *pkt); /* * Allocate bytes in the WPACKET for the output. This reserves the bytes * and counts them as "written", but doesn't actually do the writing. A pointer - * to the allocated bytes is stored in |*allocbytes|. + * to the allocated bytes is stored in |*allocbytes|. |allocbytes| may be NULL. + * WARNING: the allocated bytes must be filled in immediately, without further + * WPACKET_* calls. If not then the underlying buffer may be realloc'd and + * change its location. */ -int WPACKET_allocate_bytes(WPACKET *pkt, size_t bytes, +int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes); +/* + * The same as WPACKET_allocate_bytes() except additionally a new sub-packet is + * started for the allocated bytes, and then closed immediately afterwards. The + * number of length bytes for the sub-packet is in |lenbytes|. Don't call this + * directly. Use the convenience macros below instead. + */ +int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len, + unsigned char **allocbytes, size_t lenbytes); + +/* + * Convenience macros for calling WPACKET_sub_allocate_bytes with different + * lengths + */ +#define WPACKET_sub_allocate_bytes_u8(pkt, len, bytes) \ + WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 1) +#define WPACKET_sub_allocate_bytes_u16(pkt, len, bytes) \ + WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 2) +#define WPACKET_sub_allocate_bytes_u24(pkt, len, bytes) \ + WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 3) +#define WPACKET_sub_allocate_bytes_u32(pkt, len, bytes) \ + WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 4) + +/* + * The same as WPACKET_allocate_bytes() except the reserved bytes are not + * actually counted as written. Typically this will be for when we don't know + * how big arbitrary data is going to be up front, but we do know what the + * maximum size will be. If this function is used, then it should be immediately + * followed by a WPACKET_allocate_bytes() call before any other WPACKET + * functions are called (unless the write to the allocated bytes is abandoned). + * + * For example: If we are generating a signature, then the size of that + * signature may not be known in advance. We can use WPACKET_reserve_bytes() to + * handle this: + * + * if (!WPACKET_sub_reserve_bytes_u16(&pkt, EVP_PKEY_size(pkey), &sigbytes1) + * || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0 + * || !WPACKET_sub_allocate_bytes_u16(&pkt, siglen, &sigbytes2) + * || sigbytes1 != sigbytes2) + * goto err; + */ +int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes); + +/* + * The "reserve_bytes" equivalent of WPACKET_sub_allocate_bytes__() + */ +int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len, + unsigned char **allocbytes, size_t lenbytes); + +/* + * Convenience macros for WPACKET_sub_reserve_bytes with different lengths + */ +#define WPACKET_sub_reserve_bytes_u8(pkt, len, bytes) \ + WPACKET_reserve_bytes__((pkt), (len), (bytes), 1) +#define WPACKET_sub_reserve_bytes_u16(pkt, len, bytes) \ + WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 2) +#define WPACKET_sub_reserve_bytes_u24(pkt, len, bytes) \ + WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 3) +#define WPACKET_sub_reserve_bytes_u32(pkt, len, bytes) \ + WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 4) + /* * Write the value stored in |val| into the WPACKET. The value will consume * |bytes| amount of storage. An error will occur if |val| cannot be * accommodated in |bytes| storage, e.g. attempting to write the value 256 into - * 1 byte will fail. + * 1 byte will fail. Don't call this directly. Use the convenience macros below + * instead. + */ +int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t bytes); + +/* + * Convenience macros for calling WPACKET_put_bytes with different + * lengths */ -int WPACKET_put_bytes(WPACKET *pkt, unsigned int val, size_t bytes); +#define WPACKET_put_bytes_u8(pkt, val) \ + WPACKET_put_bytes__((pkt), (val), 1) +#define WPACKET_put_bytes_u16(pkt, val) \ + WPACKET_put_bytes__((pkt), (val), 2) +#define WPACKET_put_bytes_u24(pkt, val) \ + WPACKET_put_bytes__((pkt), (val), 3) +#define WPACKET_put_bytes_u32(pkt, val) \ + WPACKET_put_bytes__((pkt), (val), 4) /* Set a maximum size that we will not allow the WPACKET to grow beyond */ int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize); @@ -690,11 +835,22 @@ int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len); /* * Copy |len| bytes of data from |*src| into the WPACKET and prefix with its - * length (consuming |lenbytes| of data for the length) + * length (consuming |lenbytes| of data for the length). Don't call this + * directly. Use the convenience macros below instead. */ -int WPACKET_sub_memcpy(WPACKET *pkt, const void *src, size_t len, +int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len, size_t lenbytes); +/* Convenience macros for calling WPACKET_sub_memcpy with different lengths */ +#define WPACKET_sub_memcpy_u8(pkt, src, len) \ + WPACKET_sub_memcpy__((pkt), (src), (len), 1) +#define WPACKET_sub_memcpy_u16(pkt, src, len) \ + WPACKET_sub_memcpy__((pkt), (src), (len), 2) +#define WPACKET_sub_memcpy_u24(pkt, src, len) \ + WPACKET_sub_memcpy__((pkt), (src), (len), 3) +#define WPACKET_sub_memcpy_u32(pkt, src, len) \ + WPACKET_sub_memcpy__((pkt), (src), (len), 4) + /* * Return the total number of bytes written so far to the underlying buffer * including any storage allocated for length bytes @@ -707,6 +863,12 @@ int WPACKET_get_total_written(WPACKET *pkt, size_t *written); */ int WPACKET_get_length(WPACKET *pkt, size_t *len); +/* + * Returns a pointer to the current write location, but does not allocate any + * bytes. + */ +unsigned char *WPACKET_get_curr(WPACKET *pkt); + /* Release resources in a WPACKET if a failure has occurred. */ void WPACKET_cleanup(WPACKET *pkt);