1 /* crypto/rand/rand_egd.c */
2 /* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
3 /* ====================================================================
4 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * 3. All advertising materials mentioning features or use of this
19 * software must display the following acknowledgment:
20 * "This product includes software developed by the OpenSSL Project
21 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 *
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 * endorse or promote products derived from this software without
25 * prior written permission. For written permission, please contact
26 * openssl-core@openssl.org.
27 *
28 * 5. Products derived from this software may not be called "OpenSSL"
29 * nor may "OpenSSL" appear in their names without prior written
30 * permission of the OpenSSL Project.
31 *
32 * 6. Redistributions of any form whatsoever must retain the following
33 * acknowledgment:
34 * "This product includes software developed by the OpenSSL Project
35 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This product includes cryptographic software written by Eric Young
52 * (eay@cryptsoft.com). This product includes software written by Tim
53 * Hudson (tjh@cryptsoft.com).
54 *
55 */
56
57 #include <openssl/e_os2.h>
58 #include <openssl/rand.h>
59 #include <openssl/buffer.h>
60
61 /*
62 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
63 *
64 * This module supplies three routines:
65 *
66 * RAND_query_egd_bytes(path, buf, bytes)
67 * will actually query "bytes" bytes of entropy form the egd-socket located
68 * at path and will write them to buf (if supplied) or will directly feed
69 * it to RAND_seed() if buf==NULL.
70 * The number of bytes is not limited by the maximum chunk size of EGD,
71 * which is 255 bytes. If more than 255 bytes are wanted, several chunks
72 * of entropy bytes are requested. The connection is left open until the
73 * query is competed.
74 * RAND_query_egd_bytes() returns with
75 * -1 if an error occured during connection or communication.
76 * num the number of bytes read from the EGD socket. This number is either
77 * the number of bytes requested or smaller, if the EGD pool is
78 * drained and the daemon signals that the pool is empty.
79 * This routine does not touch any RAND_status(). This is necessary, since
80 * PRNG functions may call it during initialization.
81 *
82 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
83 * used to seed the PRNG.
84 * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
85 * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
86 * seed status so that the return value can reflect the seed state:
87 * -1 if an error occured during connection or communication _or_
88 * if the PRNG has still not received the required seeding.
89 * num the number of bytes read from the EGD socket. This number is either
90 * the number of bytes requested or smaller, if the EGD pool is
91 * drained and the daemon signals that the pool is empty.
92 *
93 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
94 * the PRNG.
95 * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
96 */
97
98 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_BEOS)
99 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
100 {
101 return(-1);
102 }
103 int RAND_egd(const char *path)
104 {
105 return(-1);
106 }
107
108 int RAND_egd_bytes(const char *path,int bytes)
109 {
110 return(-1);
111 }
112 #else
113 #include <openssl/opensslconf.h>
114 #include OPENSSL_UNISTD
115 #include <sys/types.h>
116 #include <sys/socket.h>
117 #ifndef NO_SYS_UN_H
118 # ifdef OPENSSL_SYS_VXWORKS
119 # include <streams/un.h>
120 # else
121 # include <sys/un.h>
122 # endif
123 #else
124 struct sockaddr_un {
125 short sun_family; /* AF_UNIX */
126 char sun_path[108]; /* path name (gag) */
127 };
128 #endif /* NO_SYS_UN_H */
129 #include <string.h>
130 #include <errno.h>
131
132 #ifndef offsetof
133 # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
134 #endif
135
136 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
137 {
138 int ret = 0;
139 struct sockaddr_un addr;
140 int len, num, numbytes;
141 int fd = -1;
142 int success;
143 unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
144
145 memset(&addr, 0, sizeof(addr));
146 addr.sun_family = AF_UNIX;
147 if (strlen(path) >= sizeof(addr.sun_path))
148 return (-1);
149 BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
150 len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
151 fd = socket(AF_UNIX, SOCK_STREAM, 0);
152 if (fd == -1) return (-1);
153 success = 0;
154 while (!success)
155 {
156 if (connect(fd, (struct sockaddr *)&addr, len) == 0)
157 success = 1;
158 else
159 {
160 switch (errno)
161 {
162 #ifdef EINTR
163 case EINTR:
164 #endif
165 #ifdef EAGAIN
166 case EAGAIN:
167 #endif
168 #ifdef EINPROGRESS
169 case EINPROGRESS:
170 #endif
171 #ifdef EALREADY
172 case EALREADY:
173 #endif
174 /* No error, try again */
175 break;
176 #ifdef EISCONN
177 case EISCONN:
178 success = 1;
179 break;
180 #endif
181 default:
182 goto err; /* failure */
183 }
184 }
185 }
186
187 while(bytes > 0)
188 {
189 egdbuf[0] = 1;
190 egdbuf[1] = bytes < 255 ? bytes : 255;
191 numbytes = 0;
192 while (numbytes != 2)
193 {
194 num = write(fd, egdbuf + numbytes, 2 - numbytes);
195 if (num >= 0)
196 numbytes += num;
197 else
198 {
199 switch (errno)
200 {
201 #ifdef EINTR
202 case EINTR:
203 #endif
204 #ifdef EAGAIN
205 case EAGAIN:
206 #endif
207 /* No error, try again */
208 break;
209 default:
210 ret = -1;
211 goto err; /* failure */
212 }
213 }
214 }
215 numbytes = 0;
216 while (numbytes != 1)
217 {
218 num = read(fd, egdbuf, 1);
219 if (num == 0)
220 goto err; /* descriptor closed */
221 else if (num > 0)
222 numbytes += num;
223 else
224 {
225 switch (errno)
226 {
227 #ifdef EINTR
228 case EINTR:
229 #endif
230 #ifdef EAGAIN
231 case EAGAIN:
232 #endif
233 /* No error, try again */
234 break;
235 default:
236 ret = -1;
237 goto err; /* failure */
238 }
239 }
240 }
241 if(egdbuf[0] == 0)
242 goto err;
243 if (buf)
244 retrievebuf = buf + ret;
245 else
246 retrievebuf = tempbuf;
247 numbytes = 0;
248 while (numbytes != egdbuf[0])
249 {
250 num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
251 if (num == 0)
252 goto err; /* descriptor closed */
253 else if (num > 0)
254 numbytes += num;
255 else
256 {
257 switch (errno)
258 {
259 #ifdef EINTR
260 case EINTR:
261 #endif
262 #ifdef EAGAIN
263 case EAGAIN:
264 #endif
265 /* No error, try again */
266 break;
267 default:
268 ret = -1;
269 goto err; /* failure */
270 }
271 }
272 }
273 ret += egdbuf[0];
274 bytes -= egdbuf[0];
275 if (!buf)
276 RAND_seed(tempbuf, egdbuf[0]);
277 }
278 err:
279 if (fd != -1) close(fd);
280 return(ret);
281 }
282
283
284 int RAND_egd_bytes(const char *path, int bytes)
285 {
286 int num, ret = 0;
287
288 num = RAND_query_egd_bytes(path, NULL, bytes);
289 if (num < 1) goto err;
290 if (RAND_status() == 1)
291 ret = num;
292 err:
293 return(ret);
294 }
295
296
297 int RAND_egd(const char *path)
298 {
299 return (RAND_egd_bytes(path, 255));
300 }
301
302
303 #endif