Line data Source code
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 :
104 : int RAND_egd(const char *path)
105 : {
106 : return (-1);
107 : }
108 :
109 : int RAND_egd_bytes(const char *path, int bytes)
110 : {
111 : return (-1);
112 : }
113 : #else
114 : # include <openssl/opensslconf.h>
115 : # include OPENSSL_UNISTD
116 : # include <stddef.h>
117 : # include <sys/types.h>
118 : # include <sys/socket.h>
119 : # ifndef NO_SYS_UN_H
120 : # ifdef OPENSSL_SYS_VXWORKS
121 : # include <streams/un.h>
122 : # else
123 : # include <sys/un.h>
124 : # endif
125 : # else
126 : struct sockaddr_un {
127 : short sun_family; /* AF_UNIX */
128 : char sun_path[108]; /* path name (gag) */
129 : };
130 : # endif /* NO_SYS_UN_H */
131 : # include <string.h>
132 : # include <errno.h>
133 :
134 : # ifndef offsetof
135 : # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
136 : # endif
137 :
138 0 : int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
139 : {
140 : int ret = 0;
141 : struct sockaddr_un addr;
142 : int len, num, numbytes;
143 : int fd = -1;
144 : int success;
145 : unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
146 :
147 : memset(&addr, 0, sizeof(addr));
148 0 : addr.sun_family = AF_UNIX;
149 0 : if (strlen(path) >= sizeof(addr.sun_path))
150 : return (-1);
151 0 : BUF_strlcpy(addr.sun_path, path, sizeof addr.sun_path);
152 0 : len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
153 0 : fd = socket(AF_UNIX, SOCK_STREAM, 0);
154 0 : if (fd == -1)
155 : return (-1);
156 : success = 0;
157 0 : while (!success) {
158 0 : if (connect(fd, (struct sockaddr *)&addr, len) == 0)
159 : success = 1;
160 : else {
161 0 : switch (errno) {
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 0 : break;
180 : # endif
181 : default:
182 : goto err; /* failure */
183 : }
184 : }
185 : }
186 :
187 0 : while (bytes > 0) {
188 0 : egdbuf[0] = 1;
189 0 : egdbuf[1] = bytes < 255 ? bytes : 255;
190 : numbytes = 0;
191 0 : while (numbytes != 2) {
192 0 : num = write(fd, egdbuf + numbytes, 2 - numbytes);
193 0 : if (num >= 0)
194 0 : numbytes += num;
195 : else {
196 0 : switch (errno) {
197 : # ifdef EINTR
198 : case EINTR:
199 : # endif
200 : # ifdef EAGAIN
201 : case EAGAIN:
202 : # endif
203 : /* No error, try again */
204 : break;
205 : default:
206 : ret = -1;
207 : goto err; /* failure */
208 : }
209 : }
210 : }
211 : numbytes = 0;
212 0 : while (numbytes != 1) {
213 0 : num = read(fd, egdbuf, 1);
214 0 : if (num == 0)
215 : goto err; /* descriptor closed */
216 0 : else if (num > 0)
217 0 : numbytes += num;
218 : else {
219 0 : switch (errno) {
220 : # ifdef EINTR
221 : case EINTR:
222 : # endif
223 : # ifdef EAGAIN
224 : case EAGAIN:
225 : # endif
226 : /* No error, try again */
227 : break;
228 : default:
229 : ret = -1;
230 : goto err; /* failure */
231 : }
232 : }
233 : }
234 0 : if (egdbuf[0] == 0)
235 : goto err;
236 0 : if (buf)
237 0 : retrievebuf = buf + ret;
238 : else
239 : retrievebuf = tempbuf;
240 : numbytes = 0;
241 0 : while (numbytes != egdbuf[0]) {
242 0 : num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
243 0 : if (num == 0)
244 : goto err; /* descriptor closed */
245 0 : else if (num > 0)
246 0 : numbytes += num;
247 : else {
248 0 : switch (errno) {
249 : # ifdef EINTR
250 : case EINTR:
251 : # endif
252 : # ifdef EAGAIN
253 : case EAGAIN:
254 : # endif
255 : /* No error, try again */
256 : break;
257 : default:
258 : ret = -1;
259 : goto err; /* failure */
260 : }
261 : }
262 : }
263 0 : ret += egdbuf[0];
264 0 : bytes -= egdbuf[0];
265 0 : if (!buf)
266 0 : RAND_seed(tempbuf, egdbuf[0]);
267 : }
268 : err:
269 0 : if (fd != -1)
270 0 : close(fd);
271 0 : return (ret);
272 : }
273 :
274 0 : int RAND_egd_bytes(const char *path, int bytes)
275 : {
276 : int num, ret = 0;
277 :
278 0 : num = RAND_query_egd_bytes(path, NULL, bytes);
279 0 : if (num < 1)
280 : goto err;
281 0 : if (RAND_status() == 1)
282 : ret = num;
283 : err:
284 0 : return (ret);
285 : }
286 :
287 0 : int RAND_egd(const char *path)
288 : {
289 0 : return (RAND_egd_bytes(path, 255));
290 : }
291 :
292 : #endif
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