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720a3741cf
entropy estimation, but causes an immediate reseed after the input (read in sizeof(u_int64_t) chunks) is "harvested". This will be used in the reboot "reseeder", coming in another commit. This can be used very effectively at any time you think your randomness is compromised; something like # (ps -gauxwww; netstat -an; dmesg; vmstat -c10 1) > /dev/random will give the attacker something to think about.
155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/*-
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* Copyright (c) 2000 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/random.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <crypto/blowfish/blowfish.h>
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#include <dev/randomdev/yarrow.h>
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static d_read_t random_read;
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static d_write_t random_write;
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#define CDEV_MAJOR 2
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#define RANDOM_MINOR 3
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#define URANDOM_MINOR 4
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static struct cdevsw random_cdevsw = {
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/* open */ (d_open_t *)nullop,
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/* close */ (d_close_t *)nullop,
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/* read */ random_read,
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/* write */ random_write,
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/* ioctl */ noioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "random",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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/* bmaj */ -1
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};
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/* For use with make_dev(9)/destroy_dev(9). */
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static dev_t random_dev;
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static dev_t urandom_dev;
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SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator");
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SYSCTL_NODE(_kern_random, OID_AUTO, yarrow, CTLFLAG_RW, 0, "Yarrow Parameters");
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SYSCTL_INT(_kern_random_yarrow, OID_AUTO, gengateinterval, CTLFLAG_RW,
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&random_state.gengateinterval, 10, "Generator Gate Interval");
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SYSCTL_INT(_kern_random_yarrow, OID_AUTO, bins, CTLFLAG_RW,
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&random_state.bins, 10, "Execution time tuner");
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SYSCTL_INT(_kern_random_yarrow, OID_AUTO, fastthresh, CTLFLAG_RW,
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&random_state.pool[0].thresh, 100, "Fast pool reseed threshhold");
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SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowthresh, CTLFLAG_RW,
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&random_state.pool[1].thresh, 100, "Slow pool reseed threshhold");
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SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowoverthresh, CTLFLAG_RW,
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&random_state.slowoverthresh, 2, "Slow pool over-threshhold reseed");
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static int
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random_read(dev_t dev, struct uio *uio, int flag)
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{
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u_int c, ret;
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int error = 0;
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void *random_buf;
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c = min(uio->uio_resid, PAGE_SIZE);
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random_buf = (void *)malloc(c, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0 && error == 0) {
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ret = read_random(random_buf, c);
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error = uiomove(random_buf, ret, uio);
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}
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free(random_buf, M_TEMP);
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return error;
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}
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static int
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random_write(dev_t dev, struct uio *uio, int flag)
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{
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u_int c;
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int error = 0;
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void *random_buf;
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random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0) {
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c = min(uio->uio_resid, PAGE_SIZE);
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error = uiomove(random_buf, c, uio);
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if (error)
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break;
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write_random(random_buf, c);
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}
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free(random_buf, M_TEMP);
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return error;
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}
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static int
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random_modevent(module_t mod, int type, void *data)
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{
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switch(type) {
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case MOD_LOAD:
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if (bootverbose)
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printf("random: <entropy source>\n");
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random_dev = make_dev(&random_cdevsw, RANDOM_MINOR, UID_ROOT,
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GID_WHEEL, 0666, "random");
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urandom_dev = make_dev(&random_cdevsw, URANDOM_MINOR, UID_ROOT,
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GID_WHEEL, 0666, "urandom");
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random_init();
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return 0;
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case MOD_UNLOAD:
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random_deinit();
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destroy_dev(random_dev);
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destroy_dev(urandom_dev);
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return 0;
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case MOD_SHUTDOWN:
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return 0;
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default:
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return EOPNOTSUPP;
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}
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}
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DEV_MODULE(random, random_modevent, NULL);
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