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      1 /*
      2  * Copyright 1995-2023 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 "internal/e_os.h" /* LIST_SEPARATOR_CHAR */
     11 #include "apps.h"
     12 #include <openssl/bio.h>
     13 #include <openssl/err.h>
     14 #include <openssl/rand.h>
     15 #include <openssl/conf.h>
     16 
     17 static char *save_rand_file;
     18 static STACK_OF(OPENSSL_STRING) *randfiles;
     19 
     20 void app_RAND_load_conf(CONF *c, const char *section)
     21 {
     22     const char *randfile = app_conf_try_string(c, section, "RANDFILE");
     23 
     24     if (randfile == NULL)
     25         return;
     26     if (RAND_load_file(randfile, -1) < 0) {
     27         BIO_printf(bio_err, "Can't load %s into RNG\n", randfile);
     28         ERR_print_errors(bio_err);
     29     }
     30     if (save_rand_file == NULL) {
     31         save_rand_file = OPENSSL_strdup(randfile);
     32         /* If some internal memory errors have occurred */
     33         if (save_rand_file == NULL) {
     34             BIO_printf(bio_err, "Can't duplicate %s\n", randfile);
     35             ERR_print_errors(bio_err);
     36         }
     37     }
     38 }
     39 
     40 static int loadfiles(char *name)
     41 {
     42     char *p;
     43     int last, ret = 1;
     44 
     45     for (;;) {
     46         last = 0;
     47         for (p = name; *p != '\0' && *p != LIST_SEPARATOR_CHAR; p++)
     48             continue;
     49         if (*p == '\0')
     50             last = 1;
     51         *p = '\0';
     52         if (RAND_load_file(name, -1) < 0) {
     53             BIO_printf(bio_err, "Can't load %s into RNG\n", name);
     54             ERR_print_errors(bio_err);
     55             ret = 0;
     56         }
     57         if (last)
     58             break;
     59         name = p + 1;
     60         if (*name == '\0')
     61             break;
     62     }
     63     return ret;
     64 }
     65 
     66 int app_RAND_load(void)
     67 {
     68     char *p;
     69     int i, ret = 1;
     70 
     71     for (i = 0; i < sk_OPENSSL_STRING_num(randfiles); i++) {
     72         p = sk_OPENSSL_STRING_value(randfiles, i);
     73         if (!loadfiles(p))
     74             ret = 0;
     75     }
     76     sk_OPENSSL_STRING_free(randfiles);
     77     return ret;
     78 }
     79 
     80 int app_RAND_write(void)
     81 {
     82     int ret = 1;
     83 
     84     if (save_rand_file == NULL)
     85         return 1;
     86     if (RAND_write_file(save_rand_file) == -1) {
     87         BIO_printf(bio_err, "Cannot write random bytes:\n");
     88         ERR_print_errors(bio_err);
     89         ret = 0;
     90     }
     91     OPENSSL_free(save_rand_file);
     92     save_rand_file = NULL;
     93     return ret;
     94 }
     95 
     96 /*
     97  * See comments in opt_verify for explanation of this.
     98  */
     99 enum r_range { OPT_R_ENUM };
    100 
    101 int opt_rand(int opt)
    102 {
    103     switch ((enum r_range)opt) {
    104     case OPT_R__FIRST:
    105     case OPT_R__LAST:
    106         break;
    107     case OPT_R_RAND:
    108         if (randfiles == NULL
    109             && (randfiles = sk_OPENSSL_STRING_new_null()) == NULL)
    110             return 0;
    111         if (!sk_OPENSSL_STRING_push(randfiles, opt_arg()))
    112             return 0;
    113         break;
    114     case OPT_R_WRITERAND:
    115         OPENSSL_free(save_rand_file);
    116         save_rand_file = OPENSSL_strdup(opt_arg());
    117         if (save_rand_file == NULL)
    118             return 0;
    119         break;
    120     }
    121     return 1;
    122 }
    123