463 lines
9.2 KiB
C
463 lines
9.2 KiB
C
/* $OpenBSD: sshbuf-getput-basic.c,v 1.5 2015/10/20 23:24:25 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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#define SSHBUF_INTERNAL
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#include "includes.h"
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "ssherr.h"
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#include "sshbuf.h"
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int
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sshbuf_get(struct sshbuf *buf, void *v, size_t len)
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{
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const u_char *p = sshbuf_ptr(buf);
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int r;
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if ((r = sshbuf_consume(buf, len)) < 0)
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return r;
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if (v != NULL && len != 0)
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memcpy(v, p, len);
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return 0;
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}
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int
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sshbuf_get_u64(struct sshbuf *buf, u_int64_t *valp)
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{
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const u_char *p = sshbuf_ptr(buf);
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int r;
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if ((r = sshbuf_consume(buf, 8)) < 0)
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return r;
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if (valp != NULL)
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*valp = PEEK_U64(p);
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return 0;
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}
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int
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sshbuf_get_u32(struct sshbuf *buf, u_int32_t *valp)
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{
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const u_char *p = sshbuf_ptr(buf);
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int r;
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if ((r = sshbuf_consume(buf, 4)) < 0)
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return r;
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if (valp != NULL)
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*valp = PEEK_U32(p);
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return 0;
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}
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int
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sshbuf_get_u16(struct sshbuf *buf, u_int16_t *valp)
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{
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const u_char *p = sshbuf_ptr(buf);
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int r;
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if ((r = sshbuf_consume(buf, 2)) < 0)
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return r;
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if (valp != NULL)
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*valp = PEEK_U16(p);
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return 0;
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}
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int
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sshbuf_get_u8(struct sshbuf *buf, u_char *valp)
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{
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const u_char *p = sshbuf_ptr(buf);
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int r;
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if ((r = sshbuf_consume(buf, 1)) < 0)
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return r;
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if (valp != NULL)
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*valp = (u_int8_t)*p;
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return 0;
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}
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int
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sshbuf_get_string(struct sshbuf *buf, u_char **valp, size_t *lenp)
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{
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const u_char *val;
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size_t len;
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int r;
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if (valp != NULL)
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*valp = NULL;
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if (lenp != NULL)
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*lenp = 0;
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if ((r = sshbuf_get_string_direct(buf, &val, &len)) < 0)
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return r;
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if (valp != NULL) {
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if ((*valp = malloc(len + 1)) == NULL) {
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SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
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return SSH_ERR_ALLOC_FAIL;
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}
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if (len != 0)
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memcpy(*valp, val, len);
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(*valp)[len] = '\0';
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}
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if (lenp != NULL)
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*lenp = len;
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return 0;
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}
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int
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sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp, size_t *lenp)
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{
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size_t len;
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const u_char *p;
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int r;
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if (valp != NULL)
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*valp = NULL;
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if (lenp != NULL)
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*lenp = 0;
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if ((r = sshbuf_peek_string_direct(buf, &p, &len)) < 0)
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return r;
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if (valp != NULL)
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*valp = p;
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if (lenp != NULL)
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*lenp = len;
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if (sshbuf_consume(buf, len + 4) != 0) {
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/* Shouldn't happen */
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SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
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SSHBUF_ABORT();
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return SSH_ERR_INTERNAL_ERROR;
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}
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return 0;
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}
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int
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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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u_int32_t len;
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const u_char *p = sshbuf_ptr(buf);
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if (valp != NULL)
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*valp = NULL;
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if (lenp != NULL)
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*lenp = 0;
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if (sshbuf_len(buf) < 4) {
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SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
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return SSH_ERR_MESSAGE_INCOMPLETE;
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}
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len = PEEK_U32(p);
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if (len > SSHBUF_SIZE_MAX - 4) {
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SSHBUF_DBG(("SSH_ERR_STRING_TOO_LARGE"));
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return SSH_ERR_STRING_TOO_LARGE;
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}
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if (sshbuf_len(buf) - 4 < len) {
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SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
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return SSH_ERR_MESSAGE_INCOMPLETE;
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}
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if (valp != NULL)
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*valp = p + 4;
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if (lenp != NULL)
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*lenp = len;
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return 0;
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}
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int
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sshbuf_get_cstring(struct sshbuf *buf, char **valp, size_t *lenp)
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{
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size_t len;
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const u_char *p, *z;
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int r;
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if (valp != NULL)
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*valp = NULL;
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if (lenp != NULL)
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*lenp = 0;
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if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
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return r;
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/* Allow a \0 only at the end of the string */
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if (len > 0 &&
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(z = memchr(p , '\0', len)) != NULL && z < p + len - 1) {
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SSHBUF_DBG(("SSH_ERR_INVALID_FORMAT"));
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return SSH_ERR_INVALID_FORMAT;
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}
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if ((r = sshbuf_skip_string(buf)) != 0)
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return -1;
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if (valp != NULL) {
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if ((*valp = malloc(len + 1)) == NULL) {
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SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
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return SSH_ERR_ALLOC_FAIL;
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}
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if (len != 0)
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memcpy(*valp, p, len);
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(*valp)[len] = '\0';
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}
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if (lenp != NULL)
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*lenp = (size_t)len;
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return 0;
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}
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int
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sshbuf_get_stringb(struct sshbuf *buf, struct sshbuf *v)
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{
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u_int32_t len;
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u_char *p;
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int r;
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/*
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* Use sshbuf_peek_string_direct() to figure out if there is
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* a complete string in 'buf' and copy the string directly
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* into 'v'.
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*/
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if ((r = sshbuf_peek_string_direct(buf, NULL, NULL)) != 0 ||
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(r = sshbuf_get_u32(buf, &len)) != 0 ||
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(r = sshbuf_reserve(v, len, &p)) != 0 ||
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(r = sshbuf_get(buf, p, len)) != 0)
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return r;
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return 0;
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}
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int
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sshbuf_put(struct sshbuf *buf, const void *v, size_t len)
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{
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u_char *p;
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int r;
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if ((r = sshbuf_reserve(buf, len, &p)) < 0)
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return r;
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if (len != 0)
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memcpy(p, v, len);
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return 0;
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}
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int
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sshbuf_putb(struct sshbuf *buf, const struct sshbuf *v)
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{
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return sshbuf_put(buf, sshbuf_ptr(v), sshbuf_len(v));
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}
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int
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sshbuf_putf(struct sshbuf *buf, const char *fmt, ...)
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{
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va_list ap;
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int r;
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va_start(ap, fmt);
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r = sshbuf_putfv(buf, fmt, ap);
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va_end(ap);
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return r;
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}
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int
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sshbuf_putfv(struct sshbuf *buf, const char *fmt, va_list ap)
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{
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va_list ap2;
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int r, len;
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u_char *p;
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va_copy(ap2, ap);
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if ((len = vsnprintf(NULL, 0, fmt, ap2)) < 0) {
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r = SSH_ERR_INVALID_ARGUMENT;
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goto out;
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}
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if (len == 0) {
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r = 0;
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goto out; /* Nothing to do */
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}
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va_end(ap2);
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va_copy(ap2, ap);
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if ((r = sshbuf_reserve(buf, (size_t)len + 1, &p)) < 0)
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goto out;
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if ((r = vsnprintf((char *)p, len + 1, fmt, ap2)) != len) {
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r = SSH_ERR_INTERNAL_ERROR;
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goto out; /* Shouldn't happen */
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}
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/* Consume terminating \0 */
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if ((r = sshbuf_consume_end(buf, 1)) != 0)
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goto out;
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r = 0;
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out:
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va_end(ap2);
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return r;
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}
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int
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sshbuf_put_u64(struct sshbuf *buf, u_int64_t val)
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{
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u_char *p;
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int r;
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if ((r = sshbuf_reserve(buf, 8, &p)) < 0)
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return r;
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POKE_U64(p, val);
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return 0;
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}
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int
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sshbuf_put_u32(struct sshbuf *buf, u_int32_t val)
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{
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u_char *p;
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int r;
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if ((r = sshbuf_reserve(buf, 4, &p)) < 0)
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return r;
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POKE_U32(p, val);
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return 0;
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}
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int
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sshbuf_put_u16(struct sshbuf *buf, u_int16_t val)
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{
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u_char *p;
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int r;
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if ((r = sshbuf_reserve(buf, 2, &p)) < 0)
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return r;
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POKE_U16(p, val);
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return 0;
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}
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int
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sshbuf_put_u8(struct sshbuf *buf, u_char val)
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{
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u_char *p;
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int r;
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if ((r = sshbuf_reserve(buf, 1, &p)) < 0)
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return r;
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p[0] = val;
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return 0;
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}
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int
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sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len)
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{
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u_char *d;
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int r;
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if (len > SSHBUF_SIZE_MAX - 4) {
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SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
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return SSH_ERR_NO_BUFFER_SPACE;
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}
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if ((r = sshbuf_reserve(buf, len + 4, &d)) < 0)
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return r;
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POKE_U32(d, len);
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if (len != 0)
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memcpy(d + 4, v, len);
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return 0;
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}
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int
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sshbuf_put_cstring(struct sshbuf *buf, const char *v)
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{
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return sshbuf_put_string(buf, (u_char *)v, v == NULL ? 0 : strlen(v));
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}
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int
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sshbuf_put_stringb(struct sshbuf *buf, const struct sshbuf *v)
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{
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return sshbuf_put_string(buf, sshbuf_ptr(v), sshbuf_len(v));
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}
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int
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sshbuf_froms(struct sshbuf *buf, struct sshbuf **bufp)
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{
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const u_char *p;
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size_t len;
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struct sshbuf *ret;
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int r;
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if (buf == NULL || bufp == NULL)
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return SSH_ERR_INVALID_ARGUMENT;
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*bufp = NULL;
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if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
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return r;
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if ((ret = sshbuf_from(p, len)) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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if ((r = sshbuf_consume(buf, len + 4)) != 0 || /* Shouldn't happen */
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(r = sshbuf_set_parent(ret, buf)) != 0) {
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sshbuf_free(ret);
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return r;
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}
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*bufp = ret;
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return 0;
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}
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int
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sshbuf_put_bignum2_bytes(struct sshbuf *buf, const void *v, size_t len)
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{
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u_char *d;
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const u_char *s = (const u_char *)v;
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int r, prepend;
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if (len > SSHBUF_SIZE_MAX - 5) {
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SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
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return SSH_ERR_NO_BUFFER_SPACE;
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}
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/* Skip leading zero bytes */
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for (; len > 0 && *s == 0; len--, s++)
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;
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/*
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* If most significant bit is set then prepend a zero byte to
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* avoid interpretation as a negative number.
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*/
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prepend = len > 0 && (s[0] & 0x80) != 0;
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if ((r = sshbuf_reserve(buf, len + 4 + prepend, &d)) < 0)
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return r;
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POKE_U32(d, len + prepend);
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if (prepend)
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d[4] = 0;
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if (len != 0)
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memcpy(d + 4 + prepend, s, len);
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return 0;
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}
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int
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sshbuf_get_bignum2_bytes_direct(struct sshbuf *buf,
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const u_char **valp, size_t *lenp)
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{
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const u_char *d;
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size_t len, olen;
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int r;
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if ((r = sshbuf_peek_string_direct(buf, &d, &olen)) < 0)
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return r;
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len = olen;
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/* Refuse negative (MSB set) bignums */
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if ((len != 0 && (*d & 0x80) != 0))
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return SSH_ERR_BIGNUM_IS_NEGATIVE;
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/* Refuse overlong bignums, allow prepended \0 to avoid MSB set */
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if (len > SSHBUF_MAX_BIGNUM + 1 ||
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(len == SSHBUF_MAX_BIGNUM + 1 && *d != 0))
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return SSH_ERR_BIGNUM_TOO_LARGE;
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/* Trim leading zeros */
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while (len > 0 && *d == 0x00) {
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d++;
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len--;
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}
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if (valp != NULL)
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*valp = d;
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if (lenp != NULL)
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*lenp = len;
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if (sshbuf_consume(buf, olen + 4) != 0) {
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/* Shouldn't happen */
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SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
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SSHBUF_ABORT();
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return SSH_ERR_INTERNAL_ERROR;
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}
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return 0;
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}
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