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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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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master