342 lines
11 KiB
C
342 lines
11 KiB
C
/* $OpenBSD: sshbuf.h,v 1.6 2015/12/10 07:01:35 mmcc Exp $ */
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/*
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* Copyright (c) 2011 Damien Miller
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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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#ifndef _SSHBUF_H
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#define _SSHBUF_H
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#include <sys/types.h>
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#include <stdarg.h>
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#include <stdio.h>
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#ifdef WITH_OPENSSL
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# include <openssl/bn.h>
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# ifdef OPENSSL_HAS_ECC
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# include <openssl/ec.h>
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# endif /* OPENSSL_HAS_ECC */
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#endif /* WITH_OPENSSL */
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#define SSHBUF_SIZE_MAX 0x8000000 /* Hard maximum size */
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#define SSHBUF_REFS_MAX 0x100000 /* Max child buffers */
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#define SSHBUF_MAX_BIGNUM (16384 / 8) /* Max bignum *bytes* */
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#define SSHBUF_MAX_ECPOINT ((528 * 2 / 8) + 1) /* Max EC point *bytes* */
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/*
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* NB. do not depend on the internals of this. It will be made opaque
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* one day.
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*/
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struct sshbuf {
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u_char *d; /* Data */
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const u_char *cd; /* Const data */
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size_t off; /* First available byte is buf->d + buf->off */
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size_t size; /* Last byte is buf->d + buf->size - 1 */
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size_t max_size; /* Maximum size of buffer */
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size_t alloc; /* Total bytes allocated to buf->d */
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int readonly; /* Refers to external, const data */
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int dont_free; /* Kludge to support sshbuf_init */
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u_int refcount; /* Tracks self and number of child buffers */
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struct sshbuf *parent; /* If child, pointer to parent */
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};
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#ifndef SSHBUF_NO_DEPREACTED
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/*
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* NB. Please do not use sshbuf_init() in new code. Please use sshbuf_new()
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* instead. sshbuf_init() is deprectated and will go away soon (it is
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* only included to allow compat with buffer_* in OpenSSH)
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*/
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void sshbuf_init(struct sshbuf *buf);
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#endif
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/*
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* Create a new sshbuf buffer.
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* Returns pointer to buffer on success, or NULL on allocation failure.
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*/
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struct sshbuf *sshbuf_new(void);
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/*
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* Create a new, read-only sshbuf buffer from existing data.
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* Returns pointer to buffer on success, or NULL on allocation failure.
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*/
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struct sshbuf *sshbuf_from(const void *blob, size_t len);
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/*
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* Create a new, read-only sshbuf buffer from the contents of an existing
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* buffer. The contents of "buf" must not change in the lifetime of the
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* resultant buffer.
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* Returns pointer to buffer on success, or NULL on allocation failure.
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*/
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struct sshbuf *sshbuf_fromb(struct sshbuf *buf);
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/*
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* Create a new, read-only sshbuf buffer from the contents of a string in
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* an existing buffer (the string is consumed in the process).
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* The contents of "buf" must not change in the lifetime of the resultant
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* buffer.
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* Returns pointer to buffer on success, or NULL on allocation failure.
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*/
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int sshbuf_froms(struct sshbuf *buf, struct sshbuf **bufp);
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/*
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* Clear and free buf
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*/
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void sshbuf_free(struct sshbuf *buf);
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/*
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* Reset buf, clearing its contents. NB. max_size is preserved.
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*/
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void sshbuf_reset(struct sshbuf *buf);
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/*
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* Return the maximum size of buf
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*/
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size_t sshbuf_max_size(const struct sshbuf *buf);
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/*
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* Set the maximum size of buf
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* Returns 0 on success, or a negative SSH_ERR_* error code on failure.
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*/
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int sshbuf_set_max_size(struct sshbuf *buf, size_t max_size);
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/*
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* Returns the length of data in buf
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*/
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size_t sshbuf_len(const struct sshbuf *buf);
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/*
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* Returns number of bytes left in buffer before hitting max_size.
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*/
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size_t sshbuf_avail(const struct sshbuf *buf);
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/*
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* Returns a read-only pointer to the start of the data in buf
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*/
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const u_char *sshbuf_ptr(const struct sshbuf *buf);
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/*
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* Returns a mutable pointer to the start of the data in buf, or
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* NULL if the buffer is read-only.
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*/
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u_char *sshbuf_mutable_ptr(const struct sshbuf *buf);
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/*
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* Check whether a reservation of size len will succeed in buf
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* Safer to use than direct comparisons again sshbuf_avail as it copes
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* with unsigned overflows correctly.
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* Returns 0 on success, or a negative SSH_ERR_* error code on failure.
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*/
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int sshbuf_check_reserve(const struct sshbuf *buf, size_t len);
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/*
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* Reserve len bytes in buf.
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* Returns 0 on success and a pointer to the first reserved byte via the
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* optional dpp parameter or a negative * SSH_ERR_* error code on failure.
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*/
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int sshbuf_reserve(struct sshbuf *buf, size_t len, u_char **dpp);
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/*
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* Consume len bytes from the start of buf
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* Returns 0 on success, or a negative SSH_ERR_* error code on failure.
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*/
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int sshbuf_consume(struct sshbuf *buf, size_t len);
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/*
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* Consume len bytes from the end of buf
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* Returns 0 on success, or a negative SSH_ERR_* error code on failure.
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*/
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int sshbuf_consume_end(struct sshbuf *buf, size_t len);
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/* Extract or deposit some bytes */
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int sshbuf_get(struct sshbuf *buf, void *v, size_t len);
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int sshbuf_put(struct sshbuf *buf, const void *v, size_t len);
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int sshbuf_putb(struct sshbuf *buf, const struct sshbuf *v);
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/* Append using a printf(3) format */
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int sshbuf_putf(struct sshbuf *buf, const char *fmt, ...)
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__attribute__((format(printf, 2, 3)));
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int sshbuf_putfv(struct sshbuf *buf, const char *fmt, va_list ap);
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/* Functions to extract or store big-endian words of various sizes */
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int sshbuf_get_u64(struct sshbuf *buf, u_int64_t *valp);
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int sshbuf_get_u32(struct sshbuf *buf, u_int32_t *valp);
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int sshbuf_get_u16(struct sshbuf *buf, u_int16_t *valp);
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int sshbuf_get_u8(struct sshbuf *buf, u_char *valp);
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int sshbuf_put_u64(struct sshbuf *buf, u_int64_t val);
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int sshbuf_put_u32(struct sshbuf *buf, u_int32_t val);
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int sshbuf_put_u16(struct sshbuf *buf, u_int16_t val);
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int sshbuf_put_u8(struct sshbuf *buf, u_char val);
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/*
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* Functions to extract or store SSH wire encoded strings (u32 len || data)
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* The "cstring" variants admit no \0 characters in the string contents.
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* Caller must free *valp.
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*/
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int sshbuf_get_string(struct sshbuf *buf, u_char **valp, size_t *lenp);
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int sshbuf_get_cstring(struct sshbuf *buf, char **valp, size_t *lenp);
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int sshbuf_get_stringb(struct sshbuf *buf, struct sshbuf *v);
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int sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len);
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int sshbuf_put_cstring(struct sshbuf *buf, const char *v);
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int sshbuf_put_stringb(struct sshbuf *buf, const struct sshbuf *v);
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/*
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* "Direct" variant of sshbuf_get_string, returns pointer into the sshbuf to
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* avoid an malloc+memcpy. The pointer is guaranteed to be valid until the
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* next sshbuf-modifying function call. Caller does not free.
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*/
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int sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp,
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size_t *lenp);
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/* Skip past a string */
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#define sshbuf_skip_string(buf) sshbuf_get_string_direct(buf, NULL, NULL)
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/* Another variant: "peeks" into the buffer without modifying it */
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int sshbuf_peek_string_direct(const struct sshbuf *buf, const u_char **valp,
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size_t *lenp);
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/*
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* Functions to extract or store SSH wire encoded bignums and elliptic
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* curve points.
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*/
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int sshbuf_put_bignum2_bytes(struct sshbuf *buf, const void *v, size_t len);
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int sshbuf_get_bignum2_bytes_direct(struct sshbuf *buf,
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const u_char **valp, size_t *lenp);
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#ifdef WITH_OPENSSL
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int sshbuf_get_bignum2(struct sshbuf *buf, BIGNUM *v);
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int sshbuf_get_bignum1(struct sshbuf *buf, BIGNUM *v);
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int sshbuf_put_bignum2(struct sshbuf *buf, const BIGNUM *v);
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int sshbuf_put_bignum1(struct sshbuf *buf, const BIGNUM *v);
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# ifdef OPENSSL_HAS_ECC
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int sshbuf_get_ec(struct sshbuf *buf, EC_POINT *v, const EC_GROUP *g);
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int sshbuf_get_eckey(struct sshbuf *buf, EC_KEY *v);
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int sshbuf_put_ec(struct sshbuf *buf, const EC_POINT *v, const EC_GROUP *g);
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int sshbuf_put_eckey(struct sshbuf *buf, const EC_KEY *v);
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# endif /* OPENSSL_HAS_ECC */
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#endif /* WITH_OPENSSL */
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/* Dump the contents of the buffer in a human-readable format */
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void sshbuf_dump(struct sshbuf *buf, FILE *f);
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/* Dump specified memory in a human-readable format */
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void sshbuf_dump_data(const void *s, size_t len, FILE *f);
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/* Return the hexadecimal representation of the contents of the buffer */
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char *sshbuf_dtob16(struct sshbuf *buf);
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/* Encode the contents of the buffer as base64 */
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char *sshbuf_dtob64(struct sshbuf *buf);
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/* Decode base64 data and append it to the buffer */
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int sshbuf_b64tod(struct sshbuf *buf, const char *b64);
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/* Macros for decoding/encoding integers */
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#define PEEK_U64(p) \
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(((u_int64_t)(((const u_char *)(p))[0]) << 56) | \
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((u_int64_t)(((const u_char *)(p))[1]) << 48) | \
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((u_int64_t)(((const u_char *)(p))[2]) << 40) | \
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((u_int64_t)(((const u_char *)(p))[3]) << 32) | \
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((u_int64_t)(((const u_char *)(p))[4]) << 24) | \
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((u_int64_t)(((const u_char *)(p))[5]) << 16) | \
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((u_int64_t)(((const u_char *)(p))[6]) << 8) | \
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(u_int64_t)(((const u_char *)(p))[7]))
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#define PEEK_U32(p) \
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(((u_int32_t)(((const u_char *)(p))[0]) << 24) | \
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((u_int32_t)(((const u_char *)(p))[1]) << 16) | \
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((u_int32_t)(((const u_char *)(p))[2]) << 8) | \
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(u_int32_t)(((const u_char *)(p))[3]))
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#define PEEK_U16(p) \
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(((u_int16_t)(((const u_char *)(p))[0]) << 8) | \
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(u_int16_t)(((const u_char *)(p))[1]))
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#define POKE_U64(p, v) \
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do { \
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const u_int64_t __v = (v); \
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((u_char *)(p))[0] = (__v >> 56) & 0xff; \
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((u_char *)(p))[1] = (__v >> 48) & 0xff; \
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((u_char *)(p))[2] = (__v >> 40) & 0xff; \
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((u_char *)(p))[3] = (__v >> 32) & 0xff; \
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((u_char *)(p))[4] = (__v >> 24) & 0xff; \
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((u_char *)(p))[5] = (__v >> 16) & 0xff; \
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((u_char *)(p))[6] = (__v >> 8) & 0xff; \
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((u_char *)(p))[7] = __v & 0xff; \
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} while (0)
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#define POKE_U32(p, v) \
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do { \
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const u_int32_t __v = (v); \
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((u_char *)(p))[0] = (__v >> 24) & 0xff; \
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((u_char *)(p))[1] = (__v >> 16) & 0xff; \
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((u_char *)(p))[2] = (__v >> 8) & 0xff; \
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((u_char *)(p))[3] = __v & 0xff; \
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} while (0)
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#define POKE_U16(p, v) \
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do { \
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const u_int16_t __v = (v); \
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((u_char *)(p))[0] = (__v >> 8) & 0xff; \
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((u_char *)(p))[1] = __v & 0xff; \
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} while (0)
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/* Internal definitions follow. Exposed for regress tests */
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#ifdef SSHBUF_INTERNAL
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/*
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* Return the allocation size of buf
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*/
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size_t sshbuf_alloc(const struct sshbuf *buf);
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/*
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* Increment the reference count of buf.
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*/
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int sshbuf_set_parent(struct sshbuf *child, struct sshbuf *parent);
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/*
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* Return the parent buffer of buf, or NULL if it has no parent.
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*/
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const struct sshbuf *sshbuf_parent(const struct sshbuf *buf);
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/*
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* Return the reference count of buf
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*/
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u_int sshbuf_refcount(const struct sshbuf *buf);
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# define SSHBUF_SIZE_INIT 256 /* Initial allocation */
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# define SSHBUF_SIZE_INC 256 /* Preferred increment length */
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# define SSHBUF_PACK_MIN 8192 /* Minimim packable offset */
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/* # define SSHBUF_ABORT abort */
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/* # define SSHBUF_DEBUG */
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# ifndef SSHBUF_ABORT
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# define SSHBUF_ABORT()
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# endif
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# ifdef SSHBUF_DEBUG
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# define SSHBUF_TELL(what) do { \
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printf("%s:%d %s: %s size %zu alloc %zu off %zu max %zu\n", \
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__FILE__, __LINE__, __func__, what, \
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buf->size, buf->alloc, buf->off, buf->max_size); \
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fflush(stdout); \
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} while (0)
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# define SSHBUF_DBG(x) do { \
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printf("%s:%d %s: ", __FILE__, __LINE__, __func__); \
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printf x; \
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printf("\n"); \
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fflush(stdout); \
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} while (0)
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# else
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# define SSHBUF_TELL(what)
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# define SSHBUF_DBG(x)
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# endif
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#endif /* SSHBUF_INTERNAL */
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#endif /* _SSHBUF_H */
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