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1/* crypto/rand/rand_unix.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#define USE_SOCKETS
113#include "e_os.h"
114#include "cryptlib.h"
115#include <openssl/rand.h>
116#include "rand_lcl.h"
117
118#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS))
119
120#include <sys/types.h>
121#include <sys/time.h>
122#include <sys/times.h>
123#include <sys/stat.h>
124#include <fcntl.h>
125#include <unistd.h>
126#include <time.h>
127
128#ifdef __OpenBSD__
129int RAND_poll(void)
130{
131 u_int32_t rnd = 0, i;
132 unsigned char buf[ENTROPY_NEEDED];
133
134 for (i = 0; i < sizeof(buf); i++) {
135 if (i % 4 == 0)
136 rnd = arc4random();
137 buf[i] = rnd;
138 rnd >>= 8;
139 }
140 RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
141 memset(buf, 0, sizeof(buf));
142
143 return 1;
144}
145#else
146int RAND_poll(void)
147{
148 unsigned long l;
149 pid_t curr_pid = getpid();
150#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
151 unsigned char tmpbuf[ENTROPY_NEEDED];
152 int n = 0;
153#endif
154#ifdef DEVRANDOM
155 static const char *randomfiles[] = { DEVRANDOM };
156 struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])];
157 int fd,i;
158#endif
159#ifdef DEVRANDOM_EGD
160 static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
161 const char **egdsocket = NULL;
162#endif
163
164#ifdef DEVRANDOM
165 memset(randomstats,0,sizeof(randomstats));
166 /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
167 * have this. Use /dev/urandom if you can as /dev/random may block
168 * if it runs out of random entries. */
169
170 for (i=0; i<sizeof(randomfiles)/sizeof(randomfiles[0]) && n < ENTROPY_NEEDED; i++)
171 {
172 if ((fd = open(randomfiles[i], O_RDONLY
173#ifdef O_NONBLOCK
174 |O_NONBLOCK
175#endif
176#ifdef O_BINARY
177 |O_BINARY
178#endif
179#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
180 our controlling tty */
181 |O_NOCTTY
182#endif
183 )) >= 0)
184 {
185 struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
186 each file. */
187 int r,j;
188 fd_set fset;
189 struct stat *st=&randomstats[i];
190
191 /* Avoid using same input... Used to be O_NOFOLLOW
192 * above, but it's not universally appropriate... */
193 if (fstat(fd,st) != 0) { close(fd); continue; }
194 for (j=0;j<i;j++)
195 {
196 if (randomstats[j].st_ino==st->st_ino &&
197 randomstats[j].st_dev==st->st_dev)
198 break;
199 }
200 if (j<i) { close(fd); continue; }
201
202 do
203 {
204 FD_ZERO(&fset);
205 FD_SET(fd, &fset);
206 r = -1;
207
208 if (select(fd+1,&fset,NULL,NULL,&t) < 0)
209 t.tv_usec=0;
210 else if (FD_ISSET(fd, &fset))
211 {
212 r=read(fd,(unsigned char *)tmpbuf+n,
213 ENTROPY_NEEDED-n);
214 if (r > 0)
215 n += r;
216 }
217
218 /* Some Unixen will update t, some
219 won't. For those who won't, give
220 up here, otherwise, we will do
221 this once again for the remaining
222 time. */
223 if (t.tv_usec == 10*1000)
224 t.tv_usec=0;
225 }
226 while ((r > 0 || (errno == EINTR || errno == EAGAIN))
227 && t.tv_usec != 0 && n < ENTROPY_NEEDED);
228
229 close(fd);
230 }
231 }
232#endif
233
234#ifdef DEVRANDOM_EGD
235 /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
236 * collecting daemon. */
237
238 for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
239 {
240 int r;
241
242 r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
243 ENTROPY_NEEDED-n);
244 if (r > 0)
245 n += r;
246 }
247#endif
248
249#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
250 if (n > 0)
251 {
252 RAND_add(tmpbuf,sizeof tmpbuf,n);
253 OPENSSL_cleanse(tmpbuf,n);
254 }
255#endif
256
257 /* put in some default random data, we need more than just this */
258 l=curr_pid;
259 RAND_add(&l,sizeof(l),0);
260 l=getuid();
261 RAND_add(&l,sizeof(l),0);
262
263 l=time(NULL);
264 RAND_add(&l,sizeof(l),0);
265
266#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
267 return 1;
268#else
269 return 0;
270#endif
271}
272
273#endif
274#endif
275
276#if defined(OPENSSL_SYS_VXWORKS)
277int RAND_poll(void)
278{
279 return 0;
280}
281#endif