app_rand.c 8.4 KB

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  1. /* apps/app_rand.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. * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
  60. *
  61. * Redistribution and use in source and binary forms, with or without
  62. * modification, are permitted provided that the following conditions
  63. * are met:
  64. *
  65. * 1. Redistributions of source code must retain the above copyright
  66. * notice, this list of conditions and the following disclaimer.
  67. *
  68. * 2. Redistributions in binary form must reproduce the above copyright
  69. * notice, this list of conditions and the following disclaimer in
  70. * the documentation and/or other materials provided with the
  71. * distribution.
  72. *
  73. * 3. All advertising materials mentioning features or use of this
  74. * software must display the following acknowledgment:
  75. * "This product includes software developed by the OpenSSL Project
  76. * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77. *
  78. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79. * endorse or promote products derived from this software without
  80. * prior written permission. For written permission, please contact
  81. * openssl-core@openssl.org.
  82. *
  83. * 5. Products derived from this software may not be called "OpenSSL"
  84. * nor may "OpenSSL" appear in their names without prior written
  85. * permission of the OpenSSL Project.
  86. *
  87. * 6. Redistributions of any form whatsoever must retain the following
  88. * acknowledgment:
  89. * "This product includes software developed by the OpenSSL Project
  90. * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91. *
  92. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  100. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  101. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  102. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  103. * OF THE POSSIBILITY OF SUCH DAMAGE.
  104. * ====================================================================
  105. *
  106. * This product includes cryptographic software written by Eric Young
  107. * (eay@cryptsoft.com). This product includes software written by Tim
  108. * Hudson (tjh@cryptsoft.com).
  109. *
  110. */
  111. #define NON_MAIN
  112. #include "apps.h"
  113. #undef NON_MAIN
  114. #include <openssl/bio.h>
  115. #include <openssl/rand.h>
  116. static int seeded = 0;
  117. static int egdsocket = 0;
  118. int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
  119. {
  120. int consider_randfile = (file == NULL);
  121. char buffer[200];
  122. #ifdef OPENSSL_SYS_WINDOWS
  123. RAND_screen();
  124. #endif
  125. if (file == NULL)
  126. file = RAND_file_name(buffer, sizeof buffer);
  127. else if (RAND_egd(file) > 0) {
  128. /*
  129. * we try if the given filename is an EGD socket. if it is, we don't
  130. * write anything back to the file.
  131. */
  132. egdsocket = 1;
  133. return 1;
  134. }
  135. if (file == NULL || !RAND_load_file(file, -1)) {
  136. if (RAND_status() == 0) {
  137. if (!dont_warn) {
  138. BIO_printf(bio_e, "unable to load 'random state'\n");
  139. BIO_printf(bio_e,
  140. "This means that the random number generator has not been seeded\n");
  141. BIO_printf(bio_e, "with much random data.\n");
  142. if (consider_randfile) { /* explanation does not apply when a
  143. * file is explicitly named */
  144. BIO_printf(bio_e,
  145. "Consider setting the RANDFILE environment variable to point at a file that\n");
  146. BIO_printf(bio_e,
  147. "'random' data can be kept in (the file will be overwritten).\n");
  148. }
  149. }
  150. return 0;
  151. }
  152. }
  153. seeded = 1;
  154. return 1;
  155. }
  156. long app_RAND_load_files(char *name)
  157. {
  158. char *p, *n;
  159. int last;
  160. long tot = 0;
  161. int egd;
  162. for (;;) {
  163. last = 0;
  164. for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
  165. if (*p == '\0')
  166. last = 1;
  167. *p = '\0';
  168. n = name;
  169. name = p + 1;
  170. if (*n == '\0')
  171. break;
  172. egd = RAND_egd(n);
  173. if (egd > 0)
  174. tot += egd;
  175. else
  176. tot += RAND_load_file(n, -1);
  177. if (last)
  178. break;
  179. }
  180. if (tot > 512)
  181. app_RAND_allow_write_file();
  182. return (tot);
  183. }
  184. int app_RAND_write_file(const char *file, BIO *bio_e)
  185. {
  186. char buffer[200];
  187. if (egdsocket || !seeded)
  188. /*
  189. * If we did not manage to read the seed file, we should not write a
  190. * low-entropy seed file back -- it would suppress a crucial warning
  191. * the next time we want to use it.
  192. */
  193. return 0;
  194. if (file == NULL)
  195. file = RAND_file_name(buffer, sizeof buffer);
  196. if (file == NULL || !RAND_write_file(file)) {
  197. BIO_printf(bio_e, "unable to write 'random state'\n");
  198. return 0;
  199. }
  200. return 1;
  201. }
  202. void app_RAND_allow_write_file(void)
  203. {
  204. seeded = 1;
  205. }