1 | /*
|
---|
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
|
---|
3 | *
|
---|
4 | * Licensed under the OpenSSL license (the "License"). You may not use
|
---|
5 | * this file except in compliance with the License. You can obtain a copy
|
---|
6 | * in the file LICENSE in the source distribution or at
|
---|
7 | * https://www.openssl.org/source/license.html
|
---|
8 | */
|
---|
9 |
|
---|
10 | #include "internal/cryptlib.h"
|
---|
11 |
|
---|
12 | #include <errno.h>
|
---|
13 | #include <stdio.h>
|
---|
14 | #include <stdlib.h>
|
---|
15 | #include <string.h>
|
---|
16 |
|
---|
17 | #include <openssl/crypto.h>
|
---|
18 | #include <openssl/rand.h>
|
---|
19 | #include <openssl/buffer.h>
|
---|
20 |
|
---|
21 | #ifdef OPENSSL_SYS_VMS
|
---|
22 | # include <unixio.h>
|
---|
23 | #endif
|
---|
24 | #ifndef NO_SYS_TYPES_H
|
---|
25 | # include <sys/types.h>
|
---|
26 | #endif
|
---|
27 | #ifndef OPENSSL_NO_POSIX_IO
|
---|
28 | # include <sys/stat.h>
|
---|
29 | # include <fcntl.h>
|
---|
30 | /*
|
---|
31 | * Following should not be needed, and we could have been stricter
|
---|
32 | * and demand S_IS*. But some systems just don't comply... Formally
|
---|
33 | * below macros are "anatomically incorrect", because normally they
|
---|
34 | * would look like ((m) & MASK == TYPE), but since MASK availability
|
---|
35 | * is as questionable, we settle for this poor-man fallback...
|
---|
36 | */
|
---|
37 | # if !defined(S_ISBLK)
|
---|
38 | # if defined(_S_IFBLK)
|
---|
39 | # define S_ISBLK(m) ((m) & _S_IFBLK)
|
---|
40 | # elif defined(S_IFBLK)
|
---|
41 | # define S_ISBLK(m) ((m) & S_IFBLK)
|
---|
42 | # elif defined(_WIN32)
|
---|
43 | # define S_ISBLK(m) 0 /* no concept of block devices on Windows */
|
---|
44 | # endif
|
---|
45 | # endif
|
---|
46 | # if !defined(S_ISCHR)
|
---|
47 | # if defined(_S_IFCHR)
|
---|
48 | # define S_ISCHR(m) ((m) & _S_IFCHR)
|
---|
49 | # elif defined(S_IFCHR)
|
---|
50 | # define S_ISCHR(m) ((m) & S_IFCHR)
|
---|
51 | # endif
|
---|
52 | # endif
|
---|
53 | #endif
|
---|
54 |
|
---|
55 | #ifdef _WIN32
|
---|
56 | # define stat _stat
|
---|
57 | # define chmod _chmod
|
---|
58 | # define open _open
|
---|
59 | # define fdopen _fdopen
|
---|
60 | # define fstat _fstat
|
---|
61 | # define fileno _fileno
|
---|
62 | #endif
|
---|
63 |
|
---|
64 | #undef BUFSIZE
|
---|
65 | #define BUFSIZE 1024
|
---|
66 | #define RAND_DATA 1024
|
---|
67 |
|
---|
68 | #ifdef OPENSSL_SYS_VMS
|
---|
69 | /*
|
---|
70 | * Misc hacks needed for specific cases.
|
---|
71 | *
|
---|
72 | * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
|
---|
73 | * to make sure the FILE* is a 32-bit pointer no matter what. We know that
|
---|
74 | * stdio function return this type (a study of stdio.h proves it).
|
---|
75 | * Additionally, we create a similar char pointer type for the sake of
|
---|
76 | * vms_setbuf below.
|
---|
77 | */
|
---|
78 | # if __INITIAL_POINTER_SIZE == 64
|
---|
79 | # pragma pointer_size save
|
---|
80 | # pragma pointer_size 32
|
---|
81 | typedef char *char_ptr32;
|
---|
82 | # pragma pointer_size restore
|
---|
83 | /*
|
---|
84 | * On VMS, setbuf() will only take 32-bit pointers, and a compilation
|
---|
85 | * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
|
---|
86 | * Since we know that the FILE* really is a 32-bit pointer expanded to
|
---|
87 | * 64 bits, we also know it's safe to convert it back to a 32-bit pointer.
|
---|
88 | * As for the buffer parameter, we only use NULL here, so that passes as
|
---|
89 | * well...
|
---|
90 | */
|
---|
91 | # define setbuf(fp,buf) (setbuf)((__FILE_ptr32)(fp), (char_ptr32)(buf))
|
---|
92 | # endif
|
---|
93 |
|
---|
94 | /*
|
---|
95 | * This declaration is a nasty hack to get around vms' extension to fopen for
|
---|
96 | * passing in sharing options being disabled by /STANDARD=ANSI89
|
---|
97 | */
|
---|
98 | static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
|
---|
99 | (__FILE_ptr32 (*)(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 |
|
---|
102 | # define openssl_fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
|
---|
103 | #endif
|
---|
104 |
|
---|
105 | #define RFILE ".rnd"
|
---|
106 |
|
---|
107 | /*
|
---|
108 | * Note that these functions are intended for seed files only. Entropy
|
---|
109 | * devices and EGD sockets are handled in rand_unix.c
|
---|
110 | */
|
---|
111 |
|
---|
112 | int RAND_load_file(const char *file, long bytes)
|
---|
113 | {
|
---|
114 | /*-
|
---|
115 | * If bytes >= 0, read up to 'bytes' bytes.
|
---|
116 | * if bytes == -1, read complete file.
|
---|
117 | */
|
---|
118 |
|
---|
119 | unsigned char buf[BUFSIZE];
|
---|
120 | #ifndef OPENSSL_NO_POSIX_IO
|
---|
121 | struct stat sb;
|
---|
122 | #endif
|
---|
123 | int i, ret = 0, n;
|
---|
124 | FILE *in = NULL;
|
---|
125 |
|
---|
126 | if (file == NULL)
|
---|
127 | return 0;
|
---|
128 |
|
---|
129 | if (bytes == 0)
|
---|
130 | return ret;
|
---|
131 |
|
---|
132 | in = openssl_fopen(file, "rb");
|
---|
133 | if (in == NULL)
|
---|
134 | goto err;
|
---|
135 |
|
---|
136 | #ifndef OPENSSL_NO_POSIX_IO
|
---|
137 | /*
|
---|
138 | * struct stat can have padding and unused fields that may not be
|
---|
139 | * initialized in the call to stat(). We need to clear the entire
|
---|
140 | * structure before calling RAND_add() to avoid complaints from
|
---|
141 | * applications such as Valgrind.
|
---|
142 | */
|
---|
143 | memset(&sb, 0, sizeof(sb));
|
---|
144 | if (fstat(fileno(in), &sb) < 0)
|
---|
145 | goto err;
|
---|
146 | RAND_add(&sb, sizeof(sb), 0.0);
|
---|
147 |
|
---|
148 | # if defined(S_ISBLK) && defined(S_ISCHR)
|
---|
149 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
|
---|
150 | /*
|
---|
151 | * this file is a device. we don't want read an infinite number of
|
---|
152 | * bytes from a random device, nor do we want to use buffered I/O
|
---|
153 | * because we will waste system entropy.
|
---|
154 | */
|
---|
155 | bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
|
---|
156 | setbuf(in, NULL); /* don't do buffered reads */
|
---|
157 | }
|
---|
158 | # endif
|
---|
159 | #endif
|
---|
160 | for (;;) {
|
---|
161 | if (bytes > 0)
|
---|
162 | n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
|
---|
163 | else
|
---|
164 | n = BUFSIZE;
|
---|
165 | i = fread(buf, 1, n, in);
|
---|
166 | if (i <= 0)
|
---|
167 | break;
|
---|
168 |
|
---|
169 | RAND_add(buf, i, (double)i);
|
---|
170 | ret += i;
|
---|
171 | if (bytes > 0) {
|
---|
172 | bytes -= n;
|
---|
173 | if (bytes <= 0)
|
---|
174 | break;
|
---|
175 | }
|
---|
176 | }
|
---|
177 | OPENSSL_cleanse(buf, BUFSIZE);
|
---|
178 | err:
|
---|
179 | if (in != NULL)
|
---|
180 | fclose(in);
|
---|
181 | return ret;
|
---|
182 | }
|
---|
183 |
|
---|
184 | int RAND_write_file(const char *file)
|
---|
185 | {
|
---|
186 | unsigned char buf[BUFSIZE];
|
---|
187 | int i, ret = 0, rand_err = 0;
|
---|
188 | FILE *out = NULL;
|
---|
189 | int n;
|
---|
190 | #ifndef OPENSSL_NO_POSIX_IO
|
---|
191 | struct stat sb;
|
---|
192 |
|
---|
193 | # if defined(S_ISBLK) && defined(S_ISCHR)
|
---|
194 | # ifdef _WIN32
|
---|
195 | /*
|
---|
196 | * Check for |file| being a driver as "ASCII-safe" on Windows,
|
---|
197 | * because driver paths are always ASCII.
|
---|
198 | */
|
---|
199 | # endif
|
---|
200 | i = stat(file, &sb);
|
---|
201 | if (i != -1) {
|
---|
202 | if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
|
---|
203 | /*
|
---|
204 | * this file is a device. we don't write back to it. we
|
---|
205 | * "succeed" on the assumption this is some sort of random
|
---|
206 | * device. Otherwise attempting to write to and chmod the device
|
---|
207 | * causes problems.
|
---|
208 | */
|
---|
209 | return 1;
|
---|
210 | }
|
---|
211 | }
|
---|
212 | # endif
|
---|
213 | #endif
|
---|
214 |
|
---|
215 | #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
|
---|
216 | !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
|
---|
217 | {
|
---|
218 | # ifndef O_BINARY
|
---|
219 | # define O_BINARY 0
|
---|
220 | # endif
|
---|
221 | /*
|
---|
222 | * chmod(..., 0600) is too late to protect the file, permissions
|
---|
223 | * should be restrictive from the start
|
---|
224 | */
|
---|
225 | int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
|
---|
226 | if (fd != -1)
|
---|
227 | out = fdopen(fd, "wb");
|
---|
228 | }
|
---|
229 | #endif
|
---|
230 |
|
---|
231 | #ifdef OPENSSL_SYS_VMS
|
---|
232 | /*
|
---|
233 | * VMS NOTE: Prior versions of this routine created a _new_ version of
|
---|
234 | * the rand file for each call into this routine, then deleted all
|
---|
235 | * existing versions named ;-1, and finally renamed the current version
|
---|
236 | * as ';1'. Under concurrent usage, this resulted in an RMS race
|
---|
237 | * condition in rename() which could orphan files (see vms message help
|
---|
238 | * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
|
---|
239 | * the top-level version of the rand file. Note that there may still be
|
---|
240 | * conditions where the top-level rand file is locked. If so, this code
|
---|
241 | * will then create a new version of the rand file. Without the delete
|
---|
242 | * and rename code, this can result in ascending file versions that stop
|
---|
243 | * at version 32767, and this routine will then return an error. The
|
---|
244 | * remedy for this is to recode the calling application to avoid
|
---|
245 | * concurrent use of the rand file, or synchronize usage at the
|
---|
246 | * application level. Also consider whether or not you NEED a persistent
|
---|
247 | * rand file in a concurrent use situation.
|
---|
248 | */
|
---|
249 |
|
---|
250 | out = openssl_fopen(file, "rb+");
|
---|
251 | #endif
|
---|
252 | if (out == NULL)
|
---|
253 | out = openssl_fopen(file, "wb");
|
---|
254 | if (out == NULL)
|
---|
255 | goto err;
|
---|
256 |
|
---|
257 | #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
|
---|
258 | chmod(file, 0600);
|
---|
259 | #endif
|
---|
260 | n = RAND_DATA;
|
---|
261 | for (;;) {
|
---|
262 | i = (n > BUFSIZE) ? BUFSIZE : n;
|
---|
263 | n -= BUFSIZE;
|
---|
264 | if (RAND_bytes(buf, i) <= 0)
|
---|
265 | rand_err = 1;
|
---|
266 | i = fwrite(buf, 1, i, out);
|
---|
267 | if (i <= 0) {
|
---|
268 | ret = 0;
|
---|
269 | break;
|
---|
270 | }
|
---|
271 | ret += i;
|
---|
272 | if (n <= 0)
|
---|
273 | break;
|
---|
274 | }
|
---|
275 |
|
---|
276 | fclose(out);
|
---|
277 | OPENSSL_cleanse(buf, BUFSIZE);
|
---|
278 | err:
|
---|
279 | return (rand_err ? -1 : ret);
|
---|
280 | }
|
---|
281 |
|
---|
282 | const char *RAND_file_name(char *buf, size_t size)
|
---|
283 | {
|
---|
284 | char *s = NULL;
|
---|
285 | int use_randfile = 1;
|
---|
286 | #ifdef __OpenBSD__
|
---|
287 | struct stat sb;
|
---|
288 | #endif
|
---|
289 |
|
---|
290 | #if defined(_WIN32) && defined(CP_UTF8)
|
---|
291 | DWORD len;
|
---|
292 | WCHAR *var, *val;
|
---|
293 |
|
---|
294 | if ((var = L"RANDFILE",
|
---|
295 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0
|
---|
296 | && (var = L"HOME", use_randfile = 0,
|
---|
297 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0
|
---|
298 | && (var = L"USERPROFILE",
|
---|
299 | len = GetEnvironmentVariableW(var, NULL, 0)) == 0) {
|
---|
300 | var = L"SYSTEMROOT",
|
---|
301 | len = GetEnvironmentVariableW(var, NULL, 0);
|
---|
302 | }
|
---|
303 |
|
---|
304 | if (len != 0) {
|
---|
305 | int sz;
|
---|
306 |
|
---|
307 | val = _alloca(len * sizeof(WCHAR));
|
---|
308 |
|
---|
309 | if (GetEnvironmentVariableW(var, val, len) < len
|
---|
310 | && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
|
---|
311 | NULL, NULL)) != 0) {
|
---|
312 | s = _alloca(sz);
|
---|
313 | if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz,
|
---|
314 | NULL, NULL) == 0)
|
---|
315 | s = NULL;
|
---|
316 | }
|
---|
317 | }
|
---|
318 | #else
|
---|
319 | if (OPENSSL_issetugid() != 0) {
|
---|
320 | use_randfile = 0;
|
---|
321 | } else {
|
---|
322 | s = getenv("RANDFILE");
|
---|
323 | if (s == NULL || *s == '\0') {
|
---|
324 | use_randfile = 0;
|
---|
325 | s = getenv("HOME");
|
---|
326 | }
|
---|
327 | }
|
---|
328 | #endif
|
---|
329 | #ifdef DEFAULT_HOME
|
---|
330 | if (!use_randfile && s == NULL) {
|
---|
331 | s = DEFAULT_HOME;
|
---|
332 | }
|
---|
333 | #endif
|
---|
334 | if (s != NULL && *s) {
|
---|
335 | size_t len = strlen(s);
|
---|
336 |
|
---|
337 | if (use_randfile && len + 1 < size) {
|
---|
338 | if (OPENSSL_strlcpy(buf, s, size) >= size)
|
---|
339 | return NULL;
|
---|
340 | } else if (len + strlen(RFILE) + 2 < size) {
|
---|
341 | OPENSSL_strlcpy(buf, s, size);
|
---|
342 | #ifndef OPENSSL_SYS_VMS
|
---|
343 | OPENSSL_strlcat(buf, "/", size);
|
---|
344 | #endif
|
---|
345 | OPENSSL_strlcat(buf, RFILE, size);
|
---|
346 | }
|
---|
347 | } else {
|
---|
348 | buf[0] = '\0'; /* no file name */
|
---|
349 | }
|
---|
350 |
|
---|
351 | #ifdef __OpenBSD__
|
---|
352 | /*
|
---|
353 | * given that all random loads just fail if the file can't be seen on a
|
---|
354 | * stat, we stat the file we're returning, if it fails, use /dev/arandom
|
---|
355 | * instead. this allows the user to use their own source for good random
|
---|
356 | * data, but defaults to something hopefully decent if that isn't
|
---|
357 | * available.
|
---|
358 | */
|
---|
359 |
|
---|
360 | if (!buf[0] || stat(buf, &sb) == -1)
|
---|
361 | if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
|
---|
362 | return NULL;
|
---|
363 | }
|
---|
364 | #endif
|
---|
365 | return buf[0] ? buf : NULL;
|
---|
366 | }
|
---|