crypto/info.c

   1 /*
   2  * Copyright 2019-2020 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 <openssl/crypto.h>
  11 #include "crypto/rand.h"
  12 #include "crypto/dso_conf.h"
  13 #include "internal/thread_once.h"
  14 #include "internal/cryptlib.h"
  15 #include "e_os.h"
  16 #include "buildinf.h"
  17
  18 #if defined(__arm__) || defined(__arm) || defined(__aarch64__)
  19 # include "arm_arch.h"
  20 #endif
  21
  22 /* extern declaration to avoid warning */
  23 extern char ossl_cpu_info_str[];
  24
  25 static char *seed_sources = NULL;
  26
  27 char ossl_cpu_info_str[128] = "";
  28 #define CPUINFO_PREFIX "CPUINFO: "
  29
  30 static CRYPTO_ONCE init_info = CRYPTO_ONCE_STATIC_INIT;
  31
  32 DEFINE_RUN_ONCE_STATIC(init_info_strings)
  33 {
  34 #if defined(OPENSSL_CPUID_OBJ)
  35 # if defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
  36      defined(__x86_64) || defined(__x86_64__) || \
  37      defined(_M_AMD64) || defined(_M_X64)
  38     const char *env;
  39
  40     BIO_snprintf(ossl_cpu_info_str, sizeof(ossl_cpu_info_str),
  41                  CPUINFO_PREFIX "OPENSSL_ia32cap=0x%llx:0x%llx",
  42                  (long long)OPENSSL_ia32cap_P[0] |
  43                  (long long)OPENSSL_ia32cap_P[1] << 32,
  44                  (long long)OPENSSL_ia32cap_P[2] |
  45                  (long long)OPENSSL_ia32cap_P[3] << 32);
  46     if ((env = getenv("OPENSSL_ia32cap")) != NULL)
  47         BIO_snprintf(ossl_cpu_info_str + strlen(ossl_cpu_info_str),
  48                      sizeof(ossl_cpu_info_str) - strlen(ossl_cpu_info_str),
  49                      " env:%s", env);
  50 # elif defined(__arm__) || defined(__arm) || defined(__aarch64__)
  51     const char *env;
  52
  53     BIO_snprintf(ossl_cpu_info_str, sizeof(ossl_cpu_info_str),
  54                  CPUINFO_PREFIX "OPENSSL_armcap=0x%x", OPENSSL_armcap_P);
  55     if ((env = getenv("OPENSSL_armcap")) != NULL)
  56         BIO_snprintf(ossl_cpu_info_str + strlen(ossl_cpu_info_str),
  57                      sizeof(ossl_cpu_info_str) - strlen(ossl_cpu_info_str),
  58                      " env:%s", env);
  59 # endif
  60 #endif
  61
  62     {
  63         static char seeds[512] = "";
  64
  65 #define add_seeds_string(str)                                           \
  66         do {                                                            \
  67             if (seeds[0] != '\0')                                       \
  68                 OPENSSL_strlcat(seeds, " ", sizeof(seeds));             \
  69             OPENSSL_strlcat(seeds, str, sizeof(seeds));                 \
  70         } while (0)
  71 #define add_seeds_stringlist(label, strlist)                            \
  72         do {                                                            \
  73             add_seeds_string(label "(");                                \
  74             {                                                           \
  75                 const char *dev[] =  { strlist, NULL };                 \
  76                 const char **p;                                         \
  77                 int first = 1;                                          \
  78                                                                         \
  79                 for (p = dev; *p != NULL; p++) {                        \
  80                     if (!first)                                         \
  81                         OPENSSL_strlcat(seeds, " ", sizeof(seeds));     \
  82                     first = 0;                                          \
  83                     OPENSSL_strlcat(seeds, *p, sizeof(seeds));          \
  84                 }                                                       \
  85             }                                                           \
  86             OPENSSL_strlcat(seeds, ")", sizeof(seeds));                 \
  87         } while (0)
  88
  89 #ifdef OPENSSL_RAND_SEED_NONE
  90         add_seeds_string("none");
  91 #endif
  92 #ifdef OPENSSL_RAND_SEED_RTDSC
  93         add_seeds_string("stdsc");
  94 #endif
  95 #ifdef OPENSSL_RAND_SEED_RDCPU
  96         add_seeds_string("rdrand ( rdseed rdrand )");
  97 #endif
  98 #ifdef OPENSSL_RAND_SEED_LIBRANDOM
  99         add_seeds_string("C-library-random");
 100 #endif
 101 #ifdef OPENSSL_RAND_SEED_GETRANDOM
 102         add_seeds_string("getrandom-syscall");
 103 #endif
 104 #ifdef OPENSSL_RAND_SEED_DEVRANDOM
 105         add_seeds_stringlist("random-device", DEVRANDOM);
 106 #endif
 107 #ifdef OPENSSL_RAND_SEED_EGD
 108         add_seeds_stringlist("EGD", DEVRANDOM_EGD);
 109 #endif
 110 #ifdef OPENSSL_RAND_SEED_OS
 111         add_seeds_string("os-specific");
 112 #endif
 113         seed_sources = seeds;
 114     }
 115     return 1;
 116 }
 117
 118 const char *OPENSSL_info(int t)
 119 {
 120     /*
 121      * We don't care about the result.  Worst case scenario, the strings
 122      * won't be initialised, i.e. remain NULL, which means that the info
 123      * isn't available anyway...
 124      */
 125     (void)RUN_ONCE(&init_info, init_info_strings);
 126
 127     switch (t) {
 128     case OPENSSL_INFO_CONFIG_DIR:
 129         return OPENSSLDIR;
 130     case OPENSSL_INFO_ENGINES_DIR:
 131         return ENGINESDIR;
 132     case OPENSSL_INFO_MODULES_DIR:
 133         return MODULESDIR;
 134     case OPENSSL_INFO_DSO_EXTENSION:
 135         return DSO_EXTENSION;
 136     case OPENSSL_INFO_DIR_FILENAME_SEPARATOR:
 137 #if defined(_WIN32)
 138         return "\\";
 139 #elif defined(__VMS)
 140         return "";
 141 #else  /* Assume POSIX */
 142         return "/";
 143 #endif
 144     case OPENSSL_INFO_LIST_SEPARATOR:
 145         {
 146             static const char list_sep[] = { LIST_SEPARATOR_CHAR, '\0' };
 147             return list_sep;
 148         }
 149     case OPENSSL_INFO_SEED_SOURCE:
 150         return seed_sources;
 151     case OPENSSL_INFO_CPU_SETTINGS:
 152         /*
 153          * If successfully initialized, ossl_cpu_info_str will start
 154          * with CPUINFO_PREFIX, if failed it will be an empty string.
 155          * Strip away the CPUINFO_PREFIX which we don't need here.
 156          */
 157         if (ossl_cpu_info_str[0] != '\0')
 158             return ossl_cpu_info_str + strlen(CPUINFO_PREFIX);
 159         break;
 160     default:
 161         break;
 162     }
 163     /* Not an error */
 164     return NULL;
 165 }