apps/lib/app_rand.c

   1 /*
   2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "apps.h"
  11 #include <openssl/bio.h>
  12 #include <openssl/err.h>
  13 #include <openssl/rand.h>
  14 #include <openssl/conf.h>
  15
  16 static char *save_rand_file;
  17 static STACK_OF(OPENSSL_STRING) *randfiles;
  18
  19 void app_RAND_load_conf(CONF *c, const char *section)
  20 {
  21     const char *randfile = NCONF_get_string(c, section, "RANDFILE");
  22
  23     if (randfile == NULL) {
  24         ERR_clear_error();
  25         return;
  26     }
  27     if (RAND_load_file(randfile, -1) < 0) {
  28         BIO_printf(bio_err, "Can't load %s into RNG\n", randfile);
  29         ERR_print_errors(bio_err);
  30     }
  31     if (save_rand_file == NULL)
  32         save_rand_file = OPENSSL_strdup(randfile);
  33 }
  34
  35 static int loadfiles(char *name)
  36 {
  37     char *p;
  38     int last, ret = 1;
  39
  40     for ( ; ; ) {
  41         last = 0;
  42         for (p = name; *p != '\0' && *p != LIST_SEPARATOR_CHAR; p++)
  43             continue;
  44         if (*p == '\0')
  45             last = 1;
  46         *p = '\0';
  47         if (RAND_load_file(name, -1) < 0) {
  48             BIO_printf(bio_err, "Can't load %s into RNG\n", name);
  49             ERR_print_errors(bio_err);
  50             ret = 0;
  51         }
  52         if (last)
  53             break;
  54         name = p + 1;
  55         if (*name == '\0')
  56             break;
  57     }
  58     return ret;
  59 }
  60
  61 int app_RAND_load(void)
  62 {
  63     char *p;
  64     int i, ret = 1;
  65
  66     for (i = 0; i < sk_OPENSSL_STRING_num(randfiles); i++) {
  67         p = sk_OPENSSL_STRING_value(randfiles, i);
  68         if (!loadfiles(p))
  69             ret = 0;
  70     }
  71     sk_OPENSSL_STRING_free(randfiles);
  72     return ret;
  73 }
  74
  75 int app_RAND_write(void)
  76 {
  77     int ret = 1;
  78
  79     if (save_rand_file == NULL)
  80         return 1;
  81     if (RAND_write_file(save_rand_file) == -1) {
  82         BIO_printf(bio_err, "Cannot write random bytes:\n");
  83         ERR_print_errors(bio_err);
  84         ret = 0;
  85     }
  86     OPENSSL_free(save_rand_file);
  87     save_rand_file =  NULL;
  88     return ret;
  89 }
  90
  91
  92 /*
  93  * See comments in opt_verify for explanation of this.
  94  */
  95 enum r_range { OPT_R_ENUM };
  96
  97 int opt_rand(int opt)
  98 {
  99     switch ((enum r_range)opt) {
 100     case OPT_R__FIRST:
 101     case OPT_R__LAST:
 102         break;
 103     case OPT_R_RAND:
 104         if (randfiles == NULL
 105                 && (randfiles = sk_OPENSSL_STRING_new_null()) == NULL)
 106             return 0;
 107         if (!sk_OPENSSL_STRING_push(randfiles, opt_arg()))
 108             return 0;
 109         break;
 110     case OPT_R_WRITERAND:
 111         OPENSSL_free(save_rand_file);
 112         save_rand_file = OPENSSL_strdup(opt_arg());
 113         break;
 114     }
 115     return 1;
 116 }