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/* $OpenBSD: sshbuf-misc.c,v 1.13 2020/01/25 23:28:06 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <resolv.h>
#include <ctype.h>
#include "ssherr.h"
#define SSHBUF_INTERNAL
#include "sshbuf.h"
void
sshbuf_dump_data(const void *s, size_t len, FILE *f)
{
size_t i, j;
const u_char *p = (const u_char *)s;
for (i = 0; i < len; i += 16) {
fprintf(f, "%.4zu: ", i);
for (j = i; j < i + 16; j++) {
if (j < len)
fprintf(f, "%02x ", p[j]);
else
fprintf(f, " ");
}
fprintf(f, " ");
for (j = i; j < i + 16; j++) {
if (j < len) {
if (isascii(p[j]) && isprint(p[j]))
fprintf(f, "%c", p[j]);
else
fprintf(f, ".");
}
}
fprintf(f, "\n");
}
}
void
sshbuf_dump(struct sshbuf *buf, FILE *f)
{
fprintf(f, "buffer %p len = %zu\n", buf, sshbuf_len(buf));
sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
}
char *
sshbuf_dtob16(struct sshbuf *buf)
{
size_t i, j, len = sshbuf_len(buf);
const u_char *p = sshbuf_ptr(buf);
char *ret;
const char hex[] = "0123456789abcdef";
if (len == 0)
return strdup("");
if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
return NULL;
for (i = j = 0; i < len; i++) {
ret[j++] = hex[(p[i] >> 4) & 0xf];
ret[j++] = hex[p[i] & 0xf];
}
ret[j] = '\0';
return ret;
}
int
sshbuf_dtob64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
{
size_t i, slen = 0;
char *s = NULL;
int r;
if (d == NULL || b64 == NULL || sshbuf_len(d) >= SIZE_MAX / 2)
return SSH_ERR_INVALID_ARGUMENT;
if (sshbuf_len(d) == 0)
return 0;
slen = ((sshbuf_len(d) + 2) / 3) * 4 + 1;
if ((s = malloc(slen)) == NULL)
return SSH_ERR_ALLOC_FAIL;
if (b64_ntop(sshbuf_ptr(d), sshbuf_len(d), s, slen) == -1) {
r = SSH_ERR_INTERNAL_ERROR;
goto fail;
}
if (wrap) {
for (i = 0; s[i] != '\0'; i++) {
if ((r = sshbuf_put_u8(b64, s[i])) != 0)
goto fail;
if (i % 70 == 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
goto fail;
}
if ((i - 1) % 70 != 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
goto fail;
} else {
if ((r = sshbuf_put(b64, s, strlen(s))) != 0)
goto fail;
}
/* Success */
r = 0;
fail:
freezero(s, slen);
return r;
}
char *
sshbuf_dtob64_string(const struct sshbuf *buf, int wrap)
{
struct sshbuf *tmp;
char *ret;
if ((tmp = sshbuf_new()) == NULL)
return NULL;
if (sshbuf_dtob64(buf, tmp, wrap) != 0) {
sshbuf_free(tmp);
return NULL;
}
ret = sshbuf_dup_string(tmp);
sshbuf_free(tmp);
return ret;
}
int
sshbuf_b64tod(struct sshbuf *buf, const char *b64)
{
size_t plen = strlen(b64);
int nlen, r;
u_char *p;
if (plen == 0)
return 0;
if ((p = malloc(plen)) == NULL)
return SSH_ERR_ALLOC_FAIL;
if ((nlen = b64_pton(b64, p, plen)) < 0) {
explicit_bzero(p, plen);
free(p);
return SSH_ERR_INVALID_FORMAT;
}
if ((r = sshbuf_put(buf, p, nlen)) < 0) {
explicit_bzero(p, plen);
free(p);
return r;
}
explicit_bzero(p, plen);
free(p);
return 0;
}
char *
sshbuf_dup_string(struct sshbuf *buf)
{
const u_char *p = NULL, *s = sshbuf_ptr(buf);
size_t l = sshbuf_len(buf);
char *r;
if (s == NULL || l > SIZE_MAX)
return NULL;
/* accept a nul only as the last character in the buffer */
if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
if (p != s + l - 1)
return NULL;
l--; /* the nul is put back below */
}
if ((r = malloc(l + 1)) == NULL)
return NULL;
if (l > 0)
memcpy(r, s, l);
r[l] = '\0';
return r;
}
int
sshbuf_cmp(const struct sshbuf *b, size_t offset,
const void *s, size_t len)
{
if (sshbuf_ptr(b) == NULL)
return SSH_ERR_INTERNAL_ERROR;
if (offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
return SSH_ERR_INVALID_ARGUMENT;
if (offset + len > sshbuf_len(b))
return SSH_ERR_MESSAGE_INCOMPLETE;
if (timingsafe_bcmp(sshbuf_ptr(b) + offset, s, len) != 0)
return SSH_ERR_INVALID_FORMAT;
return 0;
}
int
sshbuf_find(const struct sshbuf *b, size_t start_offset,
const void *s, size_t len, size_t *offsetp)
{
void *p;
if (offsetp != NULL)
*offsetp = 0;
if (sshbuf_ptr(b) == NULL)
return SSH_ERR_INTERNAL_ERROR;
if (start_offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
return SSH_ERR_INVALID_ARGUMENT;
if (start_offset > sshbuf_len(b) || start_offset + len > sshbuf_len(b))
return SSH_ERR_MESSAGE_INCOMPLETE;
if ((p = memmem(sshbuf_ptr(b) + start_offset,
sshbuf_len(b) - start_offset, s, len)) == NULL)
return SSH_ERR_INVALID_FORMAT;
if (offsetp != NULL)
*offsetp = (const u_char *)p - sshbuf_ptr(b);
return 0;
}
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