1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*-
* Copyright (c) 2000 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/select.h>
#include <sys/random.h>
#include <sys/vnode.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/sysctl.h>
#include <crypto/blowfish/blowfish.h>
#include <dev/random/hash.h>
#include <dev/random/yarrow.h>
static d_open_t random_open;
static d_read_t random_read;
static d_write_t random_write;
static d_ioctl_t random_ioctl;
static d_poll_t random_poll;
#define CDEV_MAJOR 2
#define RANDOM_MINOR 3
#define URANDOM_MINOR 4
static struct cdevsw random_cdevsw = {
/* open */ random_open,
/* close */ (d_close_t *)nullop,
/* read */ random_read,
/* write */ random_write,
/* ioctl */ random_ioctl,
/* poll */ random_poll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "random",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
/* For use with make_dev(9)/destroy_dev(9). */
static dev_t random_dev;
static dev_t urandom_dev; /* XXX Temporary */
SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator");
SYSCTL_NODE(_kern_random, OID_AUTO, yarrow, CTLFLAG_RW, 0, "Yarrow Parameters");
SYSCTL_INT(_kern_random_yarrow, OID_AUTO, gengateinterval, CTLFLAG_RW,
&random_state.gengateinterval, 10, "Generator Gate Interval");
SYSCTL_INT(_kern_random_yarrow, OID_AUTO, bins, CTLFLAG_RW,
&random_state.bins, 10, "Execution time tuner");
SYSCTL_INT(_kern_random_yarrow, OID_AUTO, fastthresh, CTLFLAG_RW,
&random_state.pool[0].thresh, 100, "Fast pool reseed threshhold");
SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowthresh, CTLFLAG_RW,
&random_state.pool[1].thresh, 160, "Slow pool reseed threshhold");
SYSCTL_INT(_kern_random_yarrow, OID_AUTO, slowoverthresh, CTLFLAG_RW,
&random_state.slowoverthresh, 2, "Slow pool over-threshhold reseed");
static int
random_open(dev_t dev, int flags, int fmt, struct proc *p)
{
if ((flags & FWRITE) && (securelevel > 0 || suser(p)))
return EPERM;
else
return 0;
}
static int
random_read(dev_t dev, struct uio *uio, int flag)
{
u_int c, ret;
int error = 0;
void *random_buf;
while (!random_state.seeded) {
if (flag & IO_NDELAY)
error = EWOULDBLOCK;
else
error = tsleep(&random_state, PUSER|PCATCH, "rndblk", 0);
if (error != 0)
return error;
}
c = min(uio->uio_resid, PAGE_SIZE);
random_buf = (void *)malloc(c, M_TEMP, M_WAITOK);
while (uio->uio_resid > 0 && error == 0) {
ret = read_random_real(random_buf, c);
error = uiomove(random_buf, ret, uio);
}
free(random_buf, M_TEMP);
return error;
}
static int
random_write(dev_t dev, struct uio *uio, int flag)
{
u_int c;
int error = 0;
void *random_buf;
random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
while (uio->uio_resid > 0) {
c = min(uio->uio_resid, PAGE_SIZE);
error = uiomove(random_buf, c, uio);
if (error)
break;
write_random(random_buf, c);
}
free(random_buf, M_TEMP);
return error;
}
static int
random_ioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
{
return ENOTTY;
}
static int
random_poll(dev_t dev, int events, struct proc *p)
{
int revents;
revents = 0;
if (events & (POLLIN | POLLRDNORM)) {
if (random_state.seeded)
revents = events & (POLLIN | POLLRDNORM);
else
selrecord(p, &random_state.rsel);
}
return revents;
}
static int
random_modevent(module_t mod, int type, void *data)
{
int error;
switch(type) {
case MOD_LOAD:
error = random_init();
if (error != 0)
return error;
if (bootverbose)
printf("random: <entropy source>\n");
random_dev = make_dev(&random_cdevsw, RANDOM_MINOR, UID_ROOT,
GID_WHEEL, 0666, "random");
urandom_dev = make_dev(&random_cdevsw, URANDOM_MINOR, UID_ROOT,
GID_WHEEL, 0666, "urandom"); /* XXX Temporary */
return 0;
case MOD_UNLOAD:
random_deinit();
destroy_dev(random_dev);
destroy_dev(urandom_dev); /* XXX Temporary */
return 0;
case MOD_SHUTDOWN:
return 0;
default:
return EOPNOTSUPP;
}
}
DEV_MODULE(random, random_modevent, NULL);
|
