mirror of
https://github.com/opnsense/src.git
synced 2026-03-16 23:55:19 -04:00
f02e47dc1e
Contains: * Refactor the hardware RNG CPU instruction sources to feed into the software mixer. This is unfinished. The actual harvesting needs to be sorted out. Modified by me (see below). * Remove 'frac' parameter from random_harvest(). This was never used and adds extra code for no good reason. * Remove device write entropy harvesting. This provided a weak attack vector, was not very good at bootstrapping the device. To follow will be a replacement explicit reseed knob. * Separate out all the RANDOM_PURE sources into separate harvest entities. This adds some secuity in the case where more than one is present. * Review all the code and fix anything obviously messy or inconsistent. Address som review concerns while I'm here, like rename the pseudo-rng to 'dummy'. Submitted by: Arthur Mesh <arthurmesh@gmail.com> (the first item)
83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/*-
|
|
* Copyright (c) 2000-2013 Mark R V Murray
|
|
* 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
|
|
* in this position and unchanged.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/* This header contains only those definitions that are global
|
|
* and harvester-specific for the entropy processor
|
|
*/
|
|
|
|
/* #define ENTROPYSOURCE nn entropy sources (actually classes)
|
|
* This is properly defined in
|
|
* an enum in sys/random.h
|
|
*/
|
|
|
|
/* The ring size _MUST_ be a power of 2 */
|
|
#define HARVEST_RING_SIZE 1024 /* harvest ring buffer size */
|
|
#define HARVEST_RING_MASK (HARVEST_RING_SIZE - 1)
|
|
|
|
#define HARVESTSIZE 16 /* max size of each harvested entropy unit */
|
|
|
|
MALLOC_DECLARE(M_ENTROPY);
|
|
|
|
/* These are used to queue harvested packets of entropy. The entropy
|
|
* buffer size is pretty arbitrary.
|
|
*/
|
|
struct harvest {
|
|
uintmax_t somecounter; /* fast counter for clock jitter */
|
|
uint8_t entropy[HARVESTSIZE]; /* the harvested entropy */
|
|
u_int size, bits; /* stats about the entropy */
|
|
enum esource source; /* origin of the entropy */
|
|
STAILQ_ENTRY(harvest) next; /* next item on the list */
|
|
};
|
|
|
|
void randomdev_init(void);
|
|
void randomdev_deinit(void);
|
|
|
|
void randomdev_init_harvester(void (*)(u_int64_t, const void *, u_int,
|
|
u_int, enum esource), int (*)(void *, int));
|
|
void randomdev_deinit_harvester(void);
|
|
|
|
void random_set_wakeup_exit(void *);
|
|
void random_process_event(struct harvest *event);
|
|
void randomdev_unblock(void);
|
|
|
|
extern struct mtx random_reseed_mtx;
|
|
|
|
/* If this was C++, the macro below would be a template */
|
|
#define RANDOM_CHECK_UINT(name, min, max) \
|
|
static int \
|
|
random_check_uint_##name(SYSCTL_HANDLER_ARGS) \
|
|
{ \
|
|
if (oidp->oid_arg1 != NULL) { \
|
|
if (*(u_int *)(oidp->oid_arg1) <= (min)) \
|
|
*(u_int *)(oidp->oid_arg1) = (min); \
|
|
else if (*(u_int *)(oidp->oid_arg1) > (max)) \
|
|
*(u_int *)(oidp->oid_arg1) = (max); \
|
|
} \
|
|
return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \
|
|
req)); \
|
|
}
|