646041a89a
if desired. Retire randomdev_none.c and introduce random_infra.c for resident infrastructure. Completely stub out random(4) calls in the "without DEV_RANDOM" case. Add RANDOM_LOADABLE option to allow loadable Yarrow/Fortuna/LocallyWritten algorithm. Add a skeleton "other" algorithm framework for folks to add their own processing code. NIST, anyone? Retire the RANDOM_DUMMY option. Build modules for Yarrow, Fortuna and "other". Use atomics for the live entropy rate-tracking. Convert ints to bools for the 'seeded' logic. Move _write() function from the algorithm-specific areas to randomdev.c Get rid of reseed() function - it is unused. Tidy up the opt_*.h includes. Update documentation for random(4) modules. Fix test program (reviewers, please leave this). Differential Revision: https://reviews.freebsd.org/D3354 Reviewed by: wblock,delphij,jmg,bjk Approved by: so (/dev/random blanket)
130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*-
|
|
* Copyright (c) 2000-2015 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
|
|
#define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/* This header contains only those definitions that are global
|
|
* and non algorithm-specific for the entropy processor
|
|
*/
|
|
|
|
#ifdef SYSCTL_DECL /* from sysctl.h */
|
|
SYSCTL_DECL(_kern_random);
|
|
|
|
#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)); \
|
|
}
|
|
#endif /* SYSCTL_DECL */
|
|
|
|
MALLOC_DECLARE(M_ENTROPY);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
struct harvest_event;
|
|
|
|
typedef void random_alg_init_t(void *);
|
|
typedef void random_alg_deinit_t(void *);
|
|
typedef void random_alg_pre_read_t(void);
|
|
typedef void random_alg_read_t(uint8_t *, u_int);
|
|
typedef bool random_alg_seeded_t(void);
|
|
typedef void random_alg_reseed_t(void);
|
|
typedef void random_alg_eventprocessor_t(struct harvest_event *);
|
|
|
|
typedef u_int random_source_read_t(void *, u_int);
|
|
|
|
/*
|
|
* Random Algorithm is a processor of randomness for the kernel
|
|
* and for userland.
|
|
*/
|
|
struct random_algorithm {
|
|
const char *ra_ident;
|
|
u_int ra_poolcount;
|
|
void (*ra_init_alg)(void *);
|
|
void (*ra_deinit_alg)(void *);
|
|
random_alg_pre_read_t *ra_pre_read;
|
|
random_alg_read_t *ra_read;
|
|
random_alg_seeded_t *ra_seeded;
|
|
random_alg_eventprocessor_t *ra_event_processor;
|
|
};
|
|
|
|
extern struct random_algorithm random_alg_context, *p_random_alg_context;
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/*
|
|
* Random Source is a source of entropy that can provide
|
|
* specified or approximate amount of entropy immediately
|
|
* upon request.
|
|
*/
|
|
struct random_source {
|
|
const char *rs_ident;
|
|
enum random_entropy_source rs_source;
|
|
random_source_read_t *rs_read;
|
|
};
|
|
|
|
struct random_sources {
|
|
LIST_ENTRY(random_sources) rrs_entries;
|
|
struct random_source *rrs_source;
|
|
};
|
|
|
|
LIST_HEAD(sources_head, random_sources);
|
|
extern struct sources_head source_list;
|
|
|
|
void random_source_register(struct random_source *);
|
|
void random_source_deregister(struct random_source *);
|
|
|
|
#if defined(RANDOM_LOADABLE)
|
|
extern struct sx randomdev_config_lock;
|
|
#define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock")
|
|
#define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock)
|
|
#define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock)
|
|
#define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock)
|
|
#define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock)
|
|
#define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock)
|
|
void random_infra_init(int (*)(struct uio *, bool), u_int (*)(void *, u_int));
|
|
void random_infra_uninit(void);
|
|
#endif
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
void randomdev_unblock(void);
|
|
|
|
#endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */
|