freebsd-dev/lib/libc/gen/arc4random-compat.c

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Update userland arc4random() with OpenBSD's Chacha20 based arc4random(). ObsoleteFiles.inc: Remove manual pages for arc4random_addrandom(3) and arc4random_stir(3). contrib/ntp/lib/isc/random.c: contrib/ntp/sntp/libevent/evutil_rand.c: Eliminate in-tree usage of arc4random_addrandom(). crypto/heimdal/lib/roken/rand.c: crypto/openssh/config.h: Eliminate in-tree usage of arc4random_stir(). include/stdlib.h: Remove arc4random_stir() and arc4random_addrandom() prototypes, provide temporary shims for transistion period. lib/libc/gen/Makefile.inc: Hook arc4random-compat.c to build, add hint for Chacha20 source for kernel, and remove arc4random_addrandom(3) and arc4random_stir(3) links. lib/libc/gen/arc4random.c: Adopt OpenBSD arc4random.c,v 1.54 with bare minimum changes, use the sys/crypto/chacha20 implementation of keystream. lib/libc/gen/Symbol.map: Remove arc4random_stir and arc4random_addrandom interfaces. lib/libc/gen/arc4random.h: Adopt OpenBSD arc4random.h,v 1.4 but provide _ARC4_LOCK of our own. lib/libc/gen/arc4random.3: Adopt OpenBSD arc4random.3,v 1.35 but keep FreeBSD r114444 and r118247. lib/libc/gen/arc4random-compat.c: Compatibility shims for arc4random_stir and arc4random_addrandom functions to preserve ABI. Log once when called but do nothing otherwise. lib/libc/gen/getentropy.c: lib/libc/include/libc_private.h: Fold __arc4_sysctl into getentropy.c (renamed to arnd_sysctl). Remove from libc_private.h as a result. sys/crypto/chacha20/chacha.c: sys/crypto/chacha20/chacha.h: Make it possible to use the kernel implementation in libc. PR: 182610 Reviewed by: cem, markm Obtained from: OpenBSD Relnotes: yes Differential Revision: https://reviews.freebsd.org/D16760
2018-08-19 17:40:50 +00:00
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Google LLC
* All rights reserved.
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <stdbool.h>
#include <syslog.h>
/*
* The following functions were removed from OpenBSD for good reasons:
*
* - arc4random_stir()
* - arc4random_addrandom()
*
* On FreeBSD, for backward ABI compatibility, we provide two wrapper which
* logs this event and returns.
*/
void __arc4random_stir_fbsd11(void);
void __arc4random_addrandom_fbsd11(u_char *, int);
void
__arc4random_stir_fbsd11(void)
{
static bool warned = false;
if (!warned)
syslog(LOG_DEBUG, "Deprecated function arc4random_stir() called");
warned = true;
}
void
__arc4random_addrandom_fbsd11(u_char * dummy1 __unused, int dummy2 __unused)
{
static bool warned = false;
if (!warned)
syslog(LOG_DEBUG, "Deprecated function arc4random_addrandom() called");
warned = true;
}
__sym_compat(arc4random_stir, __arc4random_stir_fbsd11, FBSD_1.0);
__sym_compat(arc4random_addrandom, __arc4random_addrandom_fbsd11, FBSD_1.0);