[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include "apps.h"
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| 11 | #include <openssl/bio.h>
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| 12 | #include <openssl/rand.h>
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| 13 |
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| 14 | static int seeded = 0;
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| 15 | static int egdsocket = 0;
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| 16 |
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| 17 | int app_RAND_load_file(const char *file, int dont_warn)
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| 18 | {
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| 19 | int consider_randfile = (file == NULL);
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| 20 | char buffer[200];
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| 21 |
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| 22 | if (file == NULL)
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| 23 | file = RAND_file_name(buffer, sizeof buffer);
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| 24 | #ifndef OPENSSL_NO_EGD
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| 25 | else if (RAND_egd(file) > 0) {
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| 26 | /*
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| 27 | * we try if the given filename is an EGD socket. if it is, we don't
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| 28 | * write anything back to the file.
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| 29 | */
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| 30 | egdsocket = 1;
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| 31 | return 1;
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| 32 | }
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| 33 | #endif
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| 34 | if (file == NULL || !RAND_load_file(file, -1)) {
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| 35 | if (RAND_status() == 0) {
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| 36 | if (!dont_warn) {
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| 37 | BIO_printf(bio_err, "unable to load 'random state'\n");
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| 38 | BIO_printf(bio_err,
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| 39 | "This means that the random number generator has not been seeded\n");
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| 40 | BIO_printf(bio_err, "with much random data.\n");
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| 41 | if (consider_randfile) { /* explanation does not apply when a
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| 42 | * file is explicitly named */
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| 43 | BIO_printf(bio_err,
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| 44 | "Consider setting the RANDFILE environment variable to point at a file that\n");
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| 45 | BIO_printf(bio_err,
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| 46 | "'random' data can be kept in (the file will be overwritten).\n");
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| 47 | }
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| 48 | }
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| 49 | return 0;
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| 50 | }
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| 51 | }
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| 52 | seeded = 1;
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| 53 | return 1;
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| 54 | }
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| 55 |
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| 56 | long app_RAND_load_files(char *name)
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| 57 | {
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| 58 | char *p, *n;
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| 59 | int last;
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| 60 | long tot = 0;
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| 61 | #ifndef OPENSSL_NO_EGD
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| 62 | int egd;
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| 63 | #endif
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| 64 |
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| 65 | for (;;) {
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| 66 | last = 0;
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| 67 | for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
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| 68 | if (*p == '\0')
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| 69 | last = 1;
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| 70 | *p = '\0';
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| 71 | n = name;
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| 72 | name = p + 1;
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| 73 | if (*n == '\0')
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| 74 | break;
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| 75 |
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| 76 | #ifndef OPENSSL_NO_EGD
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| 77 | egd = RAND_egd(n);
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| 78 | if (egd > 0)
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| 79 | tot += egd;
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| 80 | else
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| 81 | #endif
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| 82 | tot += RAND_load_file(n, -1);
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| 83 | if (last)
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| 84 | break;
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| 85 | }
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| 86 | if (tot > 512)
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| 87 | app_RAND_allow_write_file();
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| 88 | return (tot);
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| 89 | }
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| 90 |
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| 91 | int app_RAND_write_file(const char *file)
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| 92 | {
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| 93 | char buffer[200];
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| 94 |
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| 95 | if (egdsocket || !seeded)
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| 96 | /*
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| 97 | * If we did not manage to read the seed file, we should not write a
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| 98 | * low-entropy seed file back -- it would suppress a crucial warning
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| 99 | * the next time we want to use it.
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| 100 | */
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| 101 | return 0;
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| 102 |
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| 103 | if (file == NULL)
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| 104 | file = RAND_file_name(buffer, sizeof buffer);
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| 105 | if (file == NULL || !RAND_write_file(file)) {
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| 106 | BIO_printf(bio_err, "unable to write 'random state'\n");
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| 107 | return 0;
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| 108 | }
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| 109 | return 1;
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| 110 | }
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| 111 |
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| 112 | void app_RAND_allow_write_file(void)
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| 113 | {
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| 114 | seeded = 1;
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| 115 | }
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