crypto/info.c

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