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/* $OpenBSD: util.c,v 1.48 2020/10/15 04:12:43 deraadt Exp $ */
/*
* Copyright (c) 1998 Per Fogelstrom, Opsycon AB
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <syslog.h>
#include "archdep.h"
#include "resolve.h"
#define KEYSTREAM_ONLY
#include "chacha_private.h"
#ifndef _RET_PROTECTOR
/*
* Stack protector dummies.
* Ideally, a scheme to compile these stubs from libc should be used, but
* this would end up dragging too much code from libc here.
*/
long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata")));
void __stack_smash_handler(char [], int);
void
__stack_smash_handler(char func[], int damaged)
{
char message[256];
/* <10> indicates LOG_CRIT */
_dl_strlcpy(message, "<10>ld.so:", sizeof message);
_dl_strlcat(message, __progname, sizeof message);
if (_dl_strlen(message) > sizeof(message)/2)
_dl_strlcpy(message + sizeof(message)/2, "...",
sizeof(message) - sizeof(message)/2);
_dl_strlcat(message, " stack overflow in function ", sizeof message);
_dl_strlcat(message, func, sizeof message);
_dl_sendsyslog(message, _dl_strlen(message), LOG_CONS);
_dl_diedie();
}
#endif /* _RET_PROTECTOR */
char *
_dl_strdup(const char *orig)
{
char *newstr;
size_t len;
len = _dl_strlen(orig)+1;
newstr = _dl_malloc(len);
if (newstr != NULL)
_dl_strlcpy(newstr, orig, len);
return (newstr);
}
#define KEYSZ 32
#define IVSZ 8
#define REKEY_AFTER_BYTES (1 << 31)
static chacha_ctx chacha;
static size_t chacha_bytes;
void
_dl_arc4randombuf(void *buf, size_t buflen)
{
if (chacha_bytes == 0) {
char bytes[KEYSZ + IVSZ];
if (_dl_getentropy(bytes, KEYSZ + IVSZ) != 0)
_dl_die("no entropy");
chacha_keysetup(&chacha, bytes, KEYSZ * 8);
chacha_ivsetup(&chacha, bytes + KEYSZ);
if (_dl_getentropy(bytes, KEYSZ + IVSZ) != 0)
_dl_die("could not clobber rng key");
}
chacha_encrypt_bytes(&chacha, buf, buf, buflen);
if (REKEY_AFTER_BYTES - chacha_bytes < buflen)
chacha_bytes = 0;
else
chacha_bytes += buflen;
}
u_int32_t
_dl_arc4random(void)
{
u_int32_t rnd;
_dl_arc4randombuf(&rnd, sizeof(rnd));
return (rnd);
}
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