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1 /* crypto/rand/randfile.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 /* We need to define this to get macros like S_IFBLK and S_IFCHR */ | |
60 #if !defined(OPENSSL_SYS_VXWORKS) | |
61 #define _XOPEN_SOURCE 500 | |
62 #endif | |
63 | |
64 #include <errno.h> | |
65 #include <stdio.h> | |
66 #include <stdlib.h> | |
67 #include <string.h> | |
68 | |
69 #include "e_os.h" | |
70 #include <openssl/crypto.h> | |
71 #include <openssl/rand.h> | |
72 #include <openssl/buffer.h> | |
73 | |
74 #ifdef OPENSSL_SYS_VMS | |
75 #include <unixio.h> | |
76 #endif | |
77 #ifndef NO_SYS_TYPES_H | |
78 # include <sys/types.h> | |
79 #endif | |
80 #ifndef OPENSSL_NO_POSIX_IO | |
81 # include <sys/stat.h> | |
82 #endif | |
83 | |
84 #ifdef _WIN32 | |
85 #define stat _stat | |
86 #define chmod _chmod | |
87 #define open _open | |
88 #define fdopen _fdopen | |
89 #endif | |
90 | |
91 #undef BUFSIZE | |
92 #define BUFSIZE 1024 | |
93 #define RAND_DATA 1024 | |
94 | |
95 #ifdef OPENSSL_SYS_VMS | |
96 /* This declaration is a nasty hack to get around vms' extension to fopen | |
97 * for passing in sharing options being disabled by our /STANDARD=ANSI89 */ | |
98 static FILE *(*const vms_fopen)(const char *, const char *, ...) = | |
99 (FILE *(*)(const char *, const char *, ...))fopen; | |
100 #define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none",
"mrs=0" | |
101 #endif | |
102 | |
103 /* #define RFILE ".rnd" - defined in ../../e_os.h */ | |
104 | |
105 /* Note that these functions are intended for seed files only. | |
106 * Entropy devices and EGD sockets are handled in rand_unix.c */ | |
107 | |
108 int RAND_load_file(const char *file, long bytes) | |
109 { | |
110 /* If bytes >= 0, read up to 'bytes' bytes. | |
111 * if bytes == -1, read complete file. */ | |
112 | |
113 MS_STATIC unsigned char buf[BUFSIZE]; | |
114 #ifndef OPENSSL_NO_POSIX_IO | |
115 struct stat sb; | |
116 #endif | |
117 int i,ret=0,n; | |
118 FILE *in; | |
119 | |
120 if (file == NULL) return(0); | |
121 | |
122 #ifndef OPENSSL_NO_POSIX_IO | |
123 #ifdef PURIFY | |
124 /* struct stat can have padding and unused fields that may not be | |
125 * initialized in the call to stat(). We need to clear the entire | |
126 * structure before calling RAND_add() to avoid complaints from | |
127 * applications such as Valgrind. | |
128 */ | |
129 memset(&sb, 0, sizeof(sb)); | |
130 #endif | |
131 if (stat(file,&sb) < 0) return(0); | |
132 RAND_add(&sb,sizeof(sb),0.0); | |
133 #endif | |
134 if (bytes == 0) return(ret); | |
135 | |
136 #ifdef OPENSSL_SYS_VMS | |
137 in=vms_fopen(file,"rb",VMS_OPEN_ATTRS); | |
138 #else | |
139 in=fopen(file,"rb"); | |
140 #endif | |
141 if (in == NULL) goto err; | |
142 #if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPENSSL_NO_POSIX_IO) | |
143 if (sb.st_mode & (S_IFBLK | S_IFCHR)) { | |
144 /* this file is a device. we don't want read an infinite number | |
145 * of bytes from a random device, nor do we want to use buffered | |
146 * I/O because we will waste system entropy. | |
147 */ | |
148 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */ | |
149 #ifndef OPENSSL_NO_SETVBUF_IONBF | |
150 setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */ | |
151 #endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ | |
152 } | |
153 #endif | |
154 for (;;) | |
155 { | |
156 if (bytes > 0) | |
157 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE; | |
158 else | |
159 n = BUFSIZE; | |
160 i=fread(buf,1,n,in); | |
161 if (i <= 0) break; | |
162 #ifdef PURIFY | |
163 RAND_add(buf,i,(double)i); | |
164 #else | |
165 /* even if n != i, use the full array */ | |
166 RAND_add(buf,n,(double)i); | |
167 #endif | |
168 ret+=i; | |
169 if (bytes > 0) | |
170 { | |
171 bytes-=n; | |
172 if (bytes <= 0) break; | |
173 } | |
174 } | |
175 fclose(in); | |
176 OPENSSL_cleanse(buf,BUFSIZE); | |
177 err: | |
178 return(ret); | |
179 } | |
180 | |
181 int RAND_write_file(const char *file) | |
182 { | |
183 unsigned char buf[BUFSIZE]; | |
184 int i,ret=0,rand_err=0; | |
185 FILE *out = NULL; | |
186 int n; | |
187 #ifndef OPENSSL_NO_POSIX_IO | |
188 struct stat sb; | |
189 | |
190 i=stat(file,&sb); | |
191 if (i != -1) { | |
192 #if defined(S_ISBLK) && defined(S_ISCHR) | |
193 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { | |
194 /* this file is a device. we don't write back to it. | |
195 * we "succeed" on the assumption this is some sort | |
196 * of random device. Otherwise attempting to write to | |
197 * and chmod the device causes problems. | |
198 */ | |
199 return(1); | |
200 } | |
201 #endif | |
202 } | |
203 #endif | |
204 | |
205 #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VM
S) | |
206 { | |
207 #ifndef O_BINARY | |
208 #define O_BINARY 0 | |
209 #endif | |
210 /* chmod(..., 0600) is too late to protect the file, | |
211 * permissions should be restrictive from the start */ | |
212 int fd = open(file, O_WRONLY|O_CREAT|O_BINARY, 0600); | |
213 if (fd != -1) | |
214 out = fdopen(fd, "wb"); | |
215 } | |
216 #endif | |
217 | |
218 #ifdef OPENSSL_SYS_VMS | |
219 /* VMS NOTE: Prior versions of this routine created a _new_ | |
220 * version of the rand file for each call into this routine, then | |
221 * deleted all existing versions named ;-1, and finally renamed | |
222 * the current version as ';1'. Under concurrent usage, this | |
223 * resulted in an RMS race condition in rename() which could | |
224 * orphan files (see vms message help for RMS$_REENT). With the | |
225 * fopen() calls below, openssl/VMS now shares the top-level | |
226 * version of the rand file. Note that there may still be | |
227 * conditions where the top-level rand file is locked. If so, this | |
228 * code will then create a new version of the rand file. Without | |
229 * the delete and rename code, this can result in ascending file | |
230 * versions that stop at version 32767, and this routine will then | |
231 * return an error. The remedy for this is to recode the calling | |
232 * application to avoid concurrent use of the rand file, or | |
233 * synchronize usage at the application level. Also consider | |
234 * whether or not you NEED a persistent rand file in a concurrent | |
235 * use situation. | |
236 */ | |
237 | |
238 out = vms_fopen(file,"rb+",VMS_OPEN_ATTRS); | |
239 if (out == NULL) | |
240 out = vms_fopen(file,"wb",VMS_OPEN_ATTRS); | |
241 #else | |
242 if (out == NULL) | |
243 out = fopen(file,"wb"); | |
244 #endif | |
245 if (out == NULL) goto err; | |
246 | |
247 #ifndef NO_CHMOD | |
248 chmod(file,0600); | |
249 #endif | |
250 n=RAND_DATA; | |
251 for (;;) | |
252 { | |
253 i=(n > BUFSIZE)?BUFSIZE:n; | |
254 n-=BUFSIZE; | |
255 if (RAND_bytes(buf,i) <= 0) | |
256 rand_err=1; | |
257 i=fwrite(buf,1,i,out); | |
258 if (i <= 0) | |
259 { | |
260 ret=0; | |
261 break; | |
262 } | |
263 ret+=i; | |
264 if (n <= 0) break; | |
265 } | |
266 | |
267 fclose(out); | |
268 OPENSSL_cleanse(buf,BUFSIZE); | |
269 err: | |
270 return (rand_err ? -1 : ret); | |
271 } | |
272 | |
273 const char *RAND_file_name(char *buf, size_t size) | |
274 { | |
275 char *s=NULL; | |
276 #ifdef __OpenBSD__ | |
277 struct stat sb; | |
278 #endif | |
279 | |
280 if (OPENSSL_issetugid() == 0) | |
281 s=getenv("RANDFILE"); | |
282 if (s != NULL && *s && strlen(s) + 1 < size) | |
283 { | |
284 if (BUF_strlcpy(buf,s,size) >= size) | |
285 return NULL; | |
286 } | |
287 else | |
288 { | |
289 if (OPENSSL_issetugid() == 0) | |
290 s=getenv("HOME"); | |
291 #ifdef DEFAULT_HOME | |
292 if (s == NULL) | |
293 { | |
294 s = DEFAULT_HOME; | |
295 } | |
296 #endif | |
297 if (s && *s && strlen(s)+strlen(RFILE)+2 < size) | |
298 { | |
299 BUF_strlcpy(buf,s,size); | |
300 #ifndef OPENSSL_SYS_VMS | |
301 BUF_strlcat(buf,"/",size); | |
302 #endif | |
303 BUF_strlcat(buf,RFILE,size); | |
304 } | |
305 else | |
306 buf[0] = '\0'; /* no file name */ | |
307 } | |
308 | |
309 #ifdef __OpenBSD__ | |
310 /* given that all random loads just fail if the file can't be | |
311 * seen on a stat, we stat the file we're returning, if it | |
312 * fails, use /dev/arandom instead. this allows the user to | |
313 * use their own source for good random data, but defaults | |
314 * to something hopefully decent if that isn't available. | |
315 */ | |
316 | |
317 if (!buf[0]) | |
318 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) { | |
319 return(NULL); | |
320 } | |
321 if (stat(buf,&sb) == -1) | |
322 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) { | |
323 return(NULL); | |
324 } | |
325 | |
326 #endif | |
327 return(buf); | |
328 } | |
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