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
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/************************************************************************
* IRC - Internet Relay Chat, random.c
* (C) 2004-2010 Bram Matthys (Syzop) and the UnrealIRCd Team
*
* See file AUTHORS in IRC package for additional names of
* the programmers.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "channel.h"
#include "version.h"
#include <time.h>
#ifdef _WIN32
#include <sys/timeb.h>
#endif
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#endif
#include <fcntl.h>
#include "h.h"
/*
* Based on Arc4 random number generator for FreeBSD/OpenBSD.
* Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
*
* Modification and redistribution in source and binary forms is
* permitted provided that due credit is given to the author and the
* OpenBSD project (for instance by leaving this copyright notice
* intact).
*
* This code is derived from section 17.1 of Applied Cryptography, second edition.
*
* *BSD code modified by Syzop to suit our needs (unreal'ized, windows, etc)
*/
struct arc4_stream {
u_char i;
u_char j;
u_char s[256];
};
static struct arc4_stream rs;
static void arc4_init(void)
{
int n;
for (n = 0; n < 256; n++)
rs.s[n] = n;
rs.i = 0;
rs.j = 0;
}
static inline void arc4_doaddrandom(u_char *dat, int datlen)
{
int n;
u_char si;
#ifdef DEBUGMODE
int i;
char outbuf[512], *p = outbuf;
*p = '\0';
for (i=0; i < datlen; i++)
{
sprintf(p, "%.2X/", dat[i]);
p += 3;
if (p > outbuf + 500)
{
strcpy(p, "....");
break;
}
}
if (strlen(outbuf) > 0)
outbuf[strlen(outbuf)-1] = '\0';
Debug((DEBUG_DEBUG, "arc4_addrandom() called, datlen=%d, data dump: %s", datlen, outbuf));
#endif
rs.i--;
for (n = 0; n < 256; n++) {
rs.i = (rs.i + 1);
si = rs.s[rs.i];
rs.j = (rs.j + si + dat[n % datlen]);
rs.s[rs.i] = rs.s[rs.j];
rs.s[rs.j] = si;
}
}
static inline void arc4_addrandom(void *dat, int datlen)
{
arc4_doaddrandom((unsigned char *)dat, datlen);
return;
}
u_char getrandom8()
{
u_char si, sj;
rs.i = (rs.i + 1);
si = rs.s[rs.i];
rs.j = (rs.j + si);
sj = rs.s[rs.j];
rs.s[rs.i] = sj;
rs.s[rs.j] = si;
return (rs.s[(si + sj) & 0xff]);
}
u_int16_t getrandom16()
{
u_int16_t val;
val = getrandom8(rs) << 8;
val |= getrandom8(rs);
return val;
}
u_int32_t getrandom32()
{
u_int32_t val;
val = getrandom8(rs) << 24;
val |= getrandom8(rs) << 16;
val |= getrandom8(rs) << 8;
val |= getrandom8(rs);
return val;
}
void add_entropy_configfile(struct stat st, char *buf)
{
unsigned char mdbuf[16];
arc4_addrandom(&st.st_size, sizeof(st.st_size));
arc4_addrandom(&st.st_mtime, sizeof(st.st_mtime));
DoMD5(mdbuf, buf, strlen(buf));
arc4_addrandom(&mdbuf, sizeof(mdbuf));
}
/*
* init_random, written by Syzop.
* This function tries to initialize the arc4 random number generator securely.
*/
void init_random()
{
struct {
#ifdef USE_SSL
char egd[32]; /* from EGD */
#endif
#ifndef _WIN32
struct timeval nowt; /* time */
char rnd[32]; /* /dev/urandom */
#else
MEMORYSTATUS mstat; /* memory status */
struct _timeb nowt; /* time */
#endif
} rdat;
int n;
#ifndef _WIN32
int fd;
#else
MEMORYSTATUS mstat;
#endif
arc4_init();
/* Grab non-OS specific "random" data */
#ifdef USE_SSL
#if OPENSSL_VERSION_NUMBER >= 0x000907000 && defined(HAVE_RAND_EGD)
if (EGD_PATH) {
n = RAND_query_egd_bytes(EGD_PATH, rdat.egd, sizeof(rdat.egd));
}
#endif
#endif
/* Grab OS specific "random" data */
#ifndef _WIN32
gettimeofday(&rdat.nowt, NULL);
fd = open("/dev/urandom", O_RDONLY);
if (fd) {
n = read(fd, &rdat.rnd, sizeof(rdat.rnd));
Debug((DEBUG_INFO, "init_random: read from /dev/urandom returned %d", n));
close(fd);
}
/* TODO: more!?? */
#else
_ftime(&rdat.nowt);
GlobalMemoryStatus (&rdat.mstat);
#endif
arc4_addrandom(&rdat, sizeof(rdat));
/* NOTE: addtional entropy is added by add_entropy_* function(s) */
}
|
