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d02b48c6 | 1 | /* crypto/rand/randfile.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
de02ec27 | 59 | /* We need to define this to get macros like S_IFBLK and S_IFCHR */ |
fe8bf956 | 60 | #define _XOPEN_SOURCE 500 |
de02ec27 | 61 | |
7d7d2cbc | 62 | #include <errno.h> |
d02b48c6 | 63 | #include <stdio.h> |
a224de3f BL |
64 | #include <stdlib.h> |
65 | #include <string.h> | |
17e3dd1c | 66 | |
a2cf08cc | 67 | #include "e_os.h" |
4981372d RL |
68 | #include <openssl/crypto.h> |
69 | #include <openssl/rand.h> | |
de02ec27 | 70 | #include <openssl/buffer.h> |
4981372d | 71 | |
bc36ee62 | 72 | #ifdef OPENSSL_SYS_VMS |
668ba7d6 RL |
73 | #include <unixio.h> |
74 | #endif | |
17f389bb AP |
75 | #ifndef NO_SYS_TYPES_H |
76 | # include <sys/types.h> | |
77 | #endif | |
49e3c9d8 | 78 | #ifndef OPENSSL_NO_POSIX_IO |
17f389bb AP |
79 | # include <sys/stat.h> |
80 | #endif | |
81 | ||
e527201f AP |
82 | #ifdef _WIN32 |
83 | #define stat _stat | |
84 | #define chmod _chmod | |
85 | #define open _open | |
86 | #define fdopen _fdopen | |
87 | #endif | |
88 | ||
d02b48c6 RE |
89 | #undef BUFSIZE |
90 | #define BUFSIZE 1024 | |
91 | #define RAND_DATA 1024 | |
92 | ||
e6b45785 AP |
93 | #ifdef OPENSSL_SYS_VMS |
94 | /* This declaration is a nasty hack to get around vms' extension to fopen | |
95 | * for passing in sharing options being disabled by our /STANDARD=ANSI89 */ | |
96 | static FILE *(*const vms_fopen)(const char *, const char *, ...) = | |
97 | (FILE *(*)(const char *, const char *, ...))fopen; | |
98 | #define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0" | |
99 | #endif | |
100 | ||
a31011e8 | 101 | /* #define RFILE ".rnd" - defined in ../../e_os.h */ |
d02b48c6 | 102 | |
928cc3a6 UM |
103 | /* Note that these functions are intended for seed files only. |
104 | * Entropy devices and EGD sockets are handled in rand_unix.c */ | |
105 | ||
6b691a5c | 106 | int RAND_load_file(const char *file, long bytes) |
d02b48c6 | 107 | { |
05ccd698 BM |
108 | /* If bytes >= 0, read up to 'bytes' bytes. |
109 | * if bytes == -1, read complete file. */ | |
110 | ||
d02b48c6 | 111 | MS_STATIC unsigned char buf[BUFSIZE]; |
49e3c9d8 | 112 | #ifndef OPENSSL_NO_POSIX_IO |
d02b48c6 | 113 | struct stat sb; |
49e3c9d8 | 114 | #endif |
6343829a | 115 | int i,ret=0,n; |
d02b48c6 RE |
116 | FILE *in; |
117 | ||
118 | if (file == NULL) return(0); | |
119 | ||
49e3c9d8 | 120 | #ifndef OPENSSL_NO_POSIX_IO |
1bfdbd8e DSH |
121 | #ifdef PURIFY |
122 | /* struct stat can have padding and unused fields that may not be | |
123 | * initialized in the call to stat(). We need to clear the entire | |
124 | * structure before calling RAND_add() to avoid complaints from | |
125 | * applications such as Valgrind. | |
126 | */ | |
127 | memset(&sb, 0, sizeof(sb)); | |
128 | #endif | |
c9fb4e2c | 129 | if (stat(file,&sb) < 0) return(0); |
a481b4b5 | 130 | RAND_add(&sb,sizeof(sb),0.0); |
49e3c9d8 | 131 | #endif |
05ccd698 | 132 | if (bytes == 0) return(ret); |
d02b48c6 | 133 | |
e6b45785 AP |
134 | #ifdef OPENSSL_SYS_VMS |
135 | in=vms_fopen(file,"rb",VMS_OPEN_ATTRS); | |
136 | #else | |
41c62a8e | 137 | in=fopen(file,"rb"); |
e6b45785 | 138 | #endif |
d02b48c6 | 139 | if (in == NULL) goto err; |
49e3c9d8 | 140 | #if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPNESSL_NO_POSIX_IO) |
de02ec27 RL |
141 | if (sb.st_mode & (S_IFBLK | S_IFCHR)) { |
142 | /* this file is a device. we don't want read an infinite number | |
143 | * of bytes from a random device, nor do we want to use buffered | |
144 | * I/O because we will waste system entropy. | |
145 | */ | |
146 | bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */ | |
147 | setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */ | |
148 | } | |
4de65cbc | 149 | #endif |
d02b48c6 RE |
150 | for (;;) |
151 | { | |
05ccd698 BM |
152 | if (bytes > 0) |
153 | n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE; | |
154 | else | |
155 | n = BUFSIZE; | |
d02b48c6 RE |
156 | i=fread(buf,1,n,in); |
157 | if (i <= 0) break; | |
8b99c79f LJ |
158 | #ifdef PURIFY |
159 | RAND_add(buf,i,(double)i); | |
160 | #else | |
3de5a774 | 161 | /* even if n != i, use the full array */ |
a481b4b5 | 162 | RAND_add(buf,n,(double)i); |
8b99c79f | 163 | #endif |
d02b48c6 | 164 | ret+=i; |
05ccd698 BM |
165 | if (bytes > 0) |
166 | { | |
167 | bytes-=n; | |
a71b5abf | 168 | if (bytes <= 0) break; |
05ccd698 | 169 | } |
d02b48c6 RE |
170 | } |
171 | fclose(in); | |
4579924b | 172 | OPENSSL_cleanse(buf,BUFSIZE); |
d02b48c6 RE |
173 | err: |
174 | return(ret); | |
175 | } | |
176 | ||
6b691a5c | 177 | int RAND_write_file(const char *file) |
d02b48c6 RE |
178 | { |
179 | unsigned char buf[BUFSIZE]; | |
6343829a | 180 | int i,ret=0,rand_err=0; |
a31011e8 | 181 | FILE *out = NULL; |
d02b48c6 | 182 | int n; |
49e3c9d8 | 183 | #ifndef OPENSSL_NO_POSIX_IO |
de02ec27 | 184 | struct stat sb; |
a6aa71ff | 185 | |
de02ec27 RL |
186 | i=stat(file,&sb); |
187 | if (i != -1) { | |
21b25ed4 DSH |
188 | #if defined(S_ISBLK) && defined(S_ISCHR) |
189 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { | |
de02ec27 RL |
190 | /* this file is a device. we don't write back to it. |
191 | * we "succeed" on the assumption this is some sort | |
192 | * of random device. Otherwise attempting to write to | |
193 | * and chmod the device causes problems. | |
194 | */ | |
195 | return(1); | |
196 | } | |
4de65cbc | 197 | #endif |
de02ec27 | 198 | } |
49e3c9d8 | 199 | #endif |
de02ec27 | 200 | |
e6b45785 | 201 | #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS) |
fd9fa844 | 202 | { |
e6b45785 AP |
203 | #ifndef O_BINARY |
204 | #define O_BINARY 0 | |
205 | #endif | |
50e4e928 BM |
206 | /* chmod(..., 0600) is too late to protect the file, |
207 | * permissions should be restrictive from the start */ | |
e6b45785 | 208 | int fd = open(file, O_WRONLY|O_CREAT|O_BINARY, 0600); |
50e4e928 BM |
209 | if (fd != -1) |
210 | out = fdopen(fd, "wb"); | |
fd9fa844 | 211 | } |
17f389bb | 212 | #endif |
e6b45785 AP |
213 | |
214 | #ifdef OPENSSL_SYS_VMS | |
215 | /* VMS NOTE: Prior versions of this routine created a _new_ | |
216 | * version of the rand file for each call into this routine, then | |
217 | * deleted all existing versions named ;-1, and finally renamed | |
218 | * the current version as ';1'. Under concurrent usage, this | |
219 | * resulted in an RMS race condition in rename() which could | |
220 | * orphan files (see vms message help for RMS$_REENT). With the | |
221 | * fopen() calls below, openssl/VMS now shares the top-level | |
222 | * version of the rand file. Note that there may still be | |
223 | * conditions where the top-level rand file is locked. If so, this | |
224 | * code will then create a new version of the rand file. Without | |
225 | * the delete and rename code, this can result in ascending file | |
226 | * versions that stop at version 32767, and this routine will then | |
227 | * return an error. The remedy for this is to recode the calling | |
228 | * application to avoid concurrent use of the rand file, or | |
229 | * synchronize usage at the application level. Also consider | |
230 | * whether or not you NEED a persistent rand file in a concurrent | |
231 | * use situation. | |
232 | */ | |
233 | ||
234 | out = vms_fopen(file,"rb+",VMS_OPEN_ATTRS); | |
235 | if (out == NULL) | |
236 | out = vms_fopen(file,"wb",VMS_OPEN_ATTRS); | |
237 | #else | |
50e4e928 BM |
238 | if (out == NULL) |
239 | out = fopen(file,"wb"); | |
e6b45785 | 240 | #endif |
50e4e928 | 241 | if (out == NULL) goto err; |
e84c2d26 | 242 | |
17f389bb | 243 | #ifndef NO_CHMOD |
6343829a | 244 | chmod(file,0600); |
17f389bb | 245 | #endif |
d02b48c6 RE |
246 | n=RAND_DATA; |
247 | for (;;) | |
248 | { | |
249 | i=(n > BUFSIZE)?BUFSIZE:n; | |
250 | n-=BUFSIZE; | |
e7f97e2d | 251 | if (RAND_bytes(buf,i) <= 0) |
4ee1eb7b | 252 | rand_err=1; |
d02b48c6 | 253 | i=fwrite(buf,1,i,out); |
6343829a | 254 | if (i <= 0) |
d02b48c6 RE |
255 | { |
256 | ret=0; | |
257 | break; | |
258 | } | |
259 | ret+=i; | |
260 | if (n <= 0) break; | |
a6aa71ff | 261 | } |
ce052b6c | 262 | |
d02b48c6 | 263 | fclose(out); |
4579924b | 264 | OPENSSL_cleanse(buf,BUFSIZE); |
d02b48c6 | 265 | err: |
4ee1eb7b | 266 | return (rand_err ? -1 : ret); |
d02b48c6 RE |
267 | } |
268 | ||
627774fd | 269 | const char *RAND_file_name(char *buf, size_t size) |
d02b48c6 | 270 | { |
36fafffa | 271 | char *s=NULL; |
de02ec27 RL |
272 | #ifdef __OpenBSD__ |
273 | struct stat sb; | |
274 | #endif | |
d02b48c6 | 275 | |
36fafffa UM |
276 | if (OPENSSL_issetugid() == 0) |
277 | s=getenv("RANDFILE"); | |
de02ec27 | 278 | if (s != NULL && *s && strlen(s) + 1 < size) |
d02b48c6 | 279 | { |
de02ec27 | 280 | if (BUF_strlcpy(buf,s,size) >= size) |
54a656ef | 281 | return NULL; |
d02b48c6 RE |
282 | } |
283 | else | |
284 | { | |
36fafffa UM |
285 | if (OPENSSL_issetugid() == 0) |
286 | s=getenv("HOME"); | |
f0b54fef RL |
287 | #ifdef DEFAULT_HOME |
288 | if (s == NULL) | |
289 | { | |
290 | s = DEFAULT_HOME; | |
291 | } | |
292 | #endif | |
de02ec27 | 293 | if (s && *s && strlen(s)+strlen(RFILE)+2 < size) |
36fafffa | 294 | { |
de02ec27 | 295 | BUF_strlcpy(buf,s,size); |
bc36ee62 | 296 | #ifndef OPENSSL_SYS_VMS |
de02ec27 | 297 | BUF_strlcat(buf,"/",size); |
7d7d2cbc | 298 | #endif |
de02ec27 | 299 | BUF_strlcat(buf,RFILE,size); |
36fafffa | 300 | } |
f0b54fef | 301 | else |
36fafffa | 302 | buf[0] = '\0'; /* no file name */ |
d02b48c6 | 303 | } |
de02ec27 RL |
304 | |
305 | #ifdef __OpenBSD__ | |
306 | /* given that all random loads just fail if the file can't be | |
307 | * seen on a stat, we stat the file we're returning, if it | |
308 | * fails, use /dev/arandom instead. this allows the user to | |
309 | * use their own source for good random data, but defaults | |
310 | * to something hopefully decent if that isn't available. | |
311 | */ | |
312 | ||
313 | if (!ok) | |
314 | if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) { | |
315 | return(NULL); | |
316 | } | |
317 | if (stat(buf,&sb) == -1) | |
318 | if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) { | |
319 | return(NULL); | |
320 | } | |
321 | ||
322 | #endif | |
323 | return(buf); | |
d02b48c6 | 324 | } |