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)
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*-
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* Copyright (c) 2015 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/random.h>
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#include <sys/sysctl.h>
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#if defined(RANDOM_LOADABLE)
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#include <sys/lock.h>
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#include <sys/sx.h>
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#endif
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#include <dev/random/randomdev.h>
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/* Set up the sysctl root node for the entropy device */
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SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Cryptographically Secure Random Number Generator");
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MALLOC_DEFINE(M_ENTROPY, "entropy", "Entropy harvesting buffers and data structures");
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struct sources_head source_list = LIST_HEAD_INITIALIZER(source_list);
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#if defined(RANDOM_LOADABLE)
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struct random_algorithm *p_random_alg_context = NULL;
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#else /* !defined(RANDOM_LOADABLE) */
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struct random_algorithm *p_random_alg_context = &random_alg_context;
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#endif /* defined(RANDOM_LOADABLE) */
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#if defined(RANDOM_LOADABLE)
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struct random_readers {
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int (*read_random_uio)(struct uio *, bool);
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u_int (*read_random)(void *, u_int);
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} random_reader_context = {
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(int (*)(struct uio *, bool))nullop,
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(u_int (*)(void *, u_int))nullop,
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};
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struct sx randomdev_config_lock;
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static void
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random_infra_sysinit(void *dummy __unused)
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{
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RANDOM_CONFIG_INIT_LOCK();
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}
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SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysinit, NULL);
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void
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random_infra_init(int (*p_random_read_uio)(struct uio *, bool), u_int (*p_random_read)(void *, u_int))
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{
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RANDOM_CONFIG_X_LOCK();
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random_reader_context.read_random_uio = p_random_read_uio;
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random_reader_context.read_random = p_random_read;
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RANDOM_CONFIG_X_UNLOCK();
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}
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void
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random_infra_uninit(void)
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{
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RANDOM_CONFIG_X_LOCK();
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random_reader_context.read_random_uio = (int (*)(struct uio *, bool))nullop;
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random_reader_context.read_random = (u_int (*)(void *, u_int))nullop;
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RANDOM_CONFIG_X_UNLOCK();
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}
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static void
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random_infra_sysuninit(void *dummy __unused)
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{
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RANDOM_CONFIG_DEINIT_LOCK();
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}
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SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysuninit, NULL);
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int
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read_random_uio(struct uio *uio, bool nonblock)
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{
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int retval;
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RANDOM_CONFIG_S_LOCK();
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retval = random_reader_context.read_random_uio(uio, nonblock);
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RANDOM_CONFIG_S_UNLOCK();
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return (retval);
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}
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u_int
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read_random(void *buf, u_int len)
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{
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u_int retval;
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RANDOM_CONFIG_S_LOCK();
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retval = random_reader_context.read_random(buf, len);
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RANDOM_CONFIG_S_UNLOCK();
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return (retval);
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}
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#endif /* defined(RANDOM_LOADABLE) */
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