providers/fips/self_test.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 <string.h>
  11 #include <openssl/evp.h>
  12 #include <openssl/params.h>
  13 #include <openssl/crypto.h>
  14 #include <openssl/fipskey.h>
  15 #include <openssl/err.h>
  16 #include "e_os.h"
  17 #include "prov/providercommonerr.h"
  18 #include "prov/providercommon.h"
  19
  20 /*
  21  * We're cheating here. Normally we don't allow RUN_ONCE usage inside the FIPS
  22  * module because all such initialisation should be associated with an
  23  * individual OSSL_LIB_CTX. That doesn't work with the self test though because
  24  * it should be run once regardless of the number of OSSL_LIB_CTXs we have.
  25  */
  26 #define ALLOW_RUN_ONCE_IN_FIPS
  27 #include <internal/thread_once.h>
  28 #include "self_test.h"
  29
  30 #define FIPS_STATE_INIT     0
  31 #define FIPS_STATE_SELFTEST 1
  32 #define FIPS_STATE_RUNNING  2
  33 #define FIPS_STATE_ERROR    3
  34
  35 /*
  36  * The number of times the module will report it is in the error state
  37  * before going quiet.
  38  */
  39 #define FIPS_ERROR_REPORTING_RATE_LIMIT     10
  40
  41 /* The size of a temp buffer used to read in data */
  42 #define INTEGRITY_BUF_SIZE (4096)
  43 #define MAX_MD_SIZE 64
  44 #define MAC_NAME    "HMAC"
  45 #define DIGEST_NAME "SHA256"
  46
  47 static int FIPS_conditional_error_check = 1;
  48 static int FIPS_state = FIPS_STATE_INIT;
  49 static CRYPTO_RWLOCK *self_test_lock = NULL;
  50 static CRYPTO_RWLOCK *fips_state_lock = NULL;
  51 static unsigned char fixed_key[32] = { FIPS_KEY_ELEMENTS };
  52
  53 static CRYPTO_ONCE fips_self_test_init = CRYPTO_ONCE_STATIC_INIT;
  54 DEFINE_RUN_ONCE_STATIC(do_fips_self_test_init)
  55 {
  56     /*
  57      * These locks get freed in platform specific ways that may occur after we
  58      * do mem leak checking. If we don't know how to free it for a particular
  59      * platform then we just leak it deliberately.
  60      */
  61     self_test_lock = CRYPTO_THREAD_lock_new();
  62     fips_state_lock = CRYPTO_THREAD_lock_new();
  63     return self_test_lock != NULL;
  64 }
  65
  66 #define DEP_DECLARE()                                                          \
  67 void init(void);                                                               \
  68 void cleanup(void);
  69
  70 /*
  71  * This is the Default Entry Point (DEP) code. Every platform must have a DEP.
  72  * See FIPS 140-2 IG 9.10
  73  *
  74  * If we're run on a platform where we don't know how to define the DEP then
  75  * the self-tests will never get triggered (FIPS_state never moves to
  76  * FIPS_STATE_SELFTEST). This will be detected as an error when SELF_TEST_post()
  77  * is called from OSSL_provider_init(), and so the fips module will be unusable
  78  * on those platforms.
  79  */
  80 #if defined(_WIN32) || defined(__CYGWIN__)
  81 # ifdef __CYGWIN__
  82 /* pick DLL_[PROCESS|THREAD]_[ATTACH|DETACH] definitions */
  83 #  include <windows.h>
  84 /*
  85  * this has side-effect of _WIN32 getting defined, which otherwise is
  86  * mutually exclusive with __CYGWIN__...
  87  */
  88 # endif
  89
  90 DEP_DECLARE()
  91 # define DEP_INIT_ATTRIBUTE
  92 # define DEP_FINI_ATTRIBUTE
  93 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
  94 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  95 {
  96     switch (fdwReason) {
  97     case DLL_PROCESS_ATTACH:
  98         init();
  99         break;
 100     case DLL_PROCESS_DETACH:
 101         cleanup();
 102         break;
 103     default:
 104         break;
 105     }
 106     return TRUE;
 107 }
 108 #elif defined(__sun) || defined(_AIX)
 109
 110 DEP_DECLARE() /* must be declared before pragma */
 111 # define DEP_INIT_ATTRIBUTE
 112 # define DEP_FINI_ATTRIBUTE
 113 # pragma init(init)
 114 # pragma fini(cleanup)
 115
 116 #elif defined(__hpux)
 117
 118 DEP_DECLARE()
 119 # define DEP_INIT_ATTRIBUTE
 120 # define DEP_FINI_ATTRIBUTE
 121 # pragma init "init"
 122 # pragma fini "cleanup"
 123
 124 #elif defined(__GNUC__)
 125 # define DEP_INIT_ATTRIBUTE static __attribute__((constructor))
 126 # define DEP_FINI_ATTRIBUTE static __attribute__((destructor))
 127
 128 #elif defined(__TANDEM)
 129 DEP_DECLARE() /* must be declared before calling init() or cleanup() */
 130 # define DEP_INIT_ATTRIBUTE
 131 # define DEP_FINI_ATTRIBUTE
 132
 133 /* Method automatically called by the NonStop OS when the DLL loads */
 134 void __INIT__init(void) {
 135     init();
 136 }
 137
 138 /* Method automatically called by the NonStop OS prior to unloading the DLL */
 139 void __TERM__cleanup(void) {
 140     cleanup();
 141 }
 142
 143 #endif
 144
 145 #if defined(DEP_INIT_ATTRIBUTE) && defined(DEP_FINI_ATTRIBUTE)
 146 DEP_INIT_ATTRIBUTE void init(void)
 147 {
 148     FIPS_state = FIPS_STATE_SELFTEST;
 149 }
 150
 151 DEP_FINI_ATTRIBUTE void cleanup(void)
 152 {
 153     CRYPTO_THREAD_lock_free(self_test_lock);
 154     CRYPTO_THREAD_lock_free(fips_state_lock);
 155 }
 156 #endif
 157
 158 /*
 159  * Calculate the HMAC SHA256 of data read using a BIO and read_cb, and verify
 160  * the result matches the expected value.
 161  * Return 1 if verified, or 0 if it fails.
 162  */
 163 static int verify_integrity(OSSL_CORE_BIO *bio, OSSL_FUNC_BIO_read_ex_fn read_ex_cb,
 164                             unsigned char *expected, size_t expected_len,
 165                             OSSL_LIB_CTX *libctx, OSSL_SELF_TEST *ev,
 166                             const char *event_type)
 167 {
 168     int ret = 0, status;
 169     unsigned char out[MAX_MD_SIZE];
 170     unsigned char buf[INTEGRITY_BUF_SIZE];
 171     size_t bytes_read = 0, out_len = 0;
 172     EVP_MAC *mac = NULL;
 173     EVP_MAC_CTX *ctx = NULL;
 174     OSSL_PARAM params[3], *p = params;
 175
 176     OSSL_SELF_TEST_onbegin(ev, event_type, OSSL_SELF_TEST_DESC_INTEGRITY_HMAC);
 177
 178     mac = EVP_MAC_fetch(libctx, MAC_NAME, NULL);
 179     if (mac == NULL)
 180         goto err;
 181     ctx = EVP_MAC_CTX_new(mac);
 182     if (ctx == NULL)
 183         goto err;
 184
 185     *p++ = OSSL_PARAM_construct_utf8_string("digest", DIGEST_NAME,
 186                                             strlen(DIGEST_NAME) + 1);
 187     *p++ = OSSL_PARAM_construct_octet_string("key", fixed_key,
 188                                              sizeof(fixed_key));
 189     *p = OSSL_PARAM_construct_end();
 190
 191     if (EVP_MAC_CTX_set_params(ctx, params) <= 0
 192         || !EVP_MAC_init(ctx))
 193         goto err;
 194
 195     while (1) {
 196         status = read_ex_cb(bio, buf, sizeof(buf), &bytes_read);
 197         if (status != 1)
 198             break;
 199         if (!EVP_MAC_update(ctx, buf, bytes_read))
 200             goto err;
 201     }
 202     if (!EVP_MAC_final(ctx, out, &out_len, sizeof(out)))
 203         goto err;
 204
 205     OSSL_SELF_TEST_oncorrupt_byte(ev, out);
 206     if (expected_len != out_len
 207             || memcmp(expected, out, out_len) != 0)
 208         goto err;
 209     ret = 1;
 210 err:
 211     OSSL_SELF_TEST_onend(ev, ret);
 212     EVP_MAC_CTX_free(ctx);
 213     EVP_MAC_free(mac);
 214     return ret;
 215 }
 216
 217 static void set_fips_state(int state)
 218 {
 219     CRYPTO_THREAD_write_lock(fips_state_lock);
 220     FIPS_state = state;
 221     CRYPTO_THREAD_unlock(fips_state_lock);
 222 }
 223
 224 /* This API is triggered either on loading of the FIPS module or on demand */
 225 int SELF_TEST_post(SELF_TEST_POST_PARAMS *st, int on_demand_test)
 226 {
 227     int ok = 0;
 228     int kats_already_passed = 0;
 229     long checksum_len;
 230     OSSL_CORE_BIO *bio_module = NULL, *bio_indicator = NULL;
 231     unsigned char *module_checksum = NULL;
 232     unsigned char *indicator_checksum = NULL;
 233     int loclstate;
 234     OSSL_SELF_TEST *ev = NULL;
 235
 236     if (!RUN_ONCE(&fips_self_test_init, do_fips_self_test_init))
 237         return 0;
 238
 239     CRYPTO_THREAD_read_lock(fips_state_lock);
 240     loclstate = FIPS_state;
 241     CRYPTO_THREAD_unlock(fips_state_lock);
 242
 243     if (loclstate == FIPS_STATE_RUNNING) {
 244         if (!on_demand_test)
 245             return 1;
 246     } else if (loclstate != FIPS_STATE_SELFTEST) {
 247         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_STATE);
 248         return 0;
 249     }
 250
 251     CRYPTO_THREAD_write_lock(self_test_lock);
 252     CRYPTO_THREAD_read_lock(fips_state_lock);
 253     if (FIPS_state == FIPS_STATE_RUNNING) {
 254         CRYPTO_THREAD_unlock(fips_state_lock);
 255         if (!on_demand_test) {
 256             CRYPTO_THREAD_unlock(self_test_lock);
 257             return 1;
 258         }
 259         set_fips_state(FIPS_STATE_SELFTEST);
 260     } else if (FIPS_state != FIPS_STATE_SELFTEST) {
 261         CRYPTO_THREAD_unlock(fips_state_lock);
 262         CRYPTO_THREAD_unlock(self_test_lock);
 263         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_STATE);
 264         return 0;
 265     } else {
 266         CRYPTO_THREAD_unlock(fips_state_lock);
 267     }
 268
 269     if (st == NULL
 270             || st->module_checksum_data == NULL) {
 271         ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_CONFIG_DATA);
 272         goto end;
 273     }
 274
 275     ev = OSSL_SELF_TEST_new(st->cb, st->cb_arg);
 276     if (ev == NULL)
 277         goto end;
 278
 279     module_checksum = OPENSSL_hexstr2buf(st->module_checksum_data,
 280                                          &checksum_len);
 281     if (module_checksum == NULL) {
 282         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CONFIG_DATA);
 283         goto end;
 284     }
 285     bio_module = (*st->bio_new_file_cb)(st->module_filename, "rb");
 286
 287     /* Always check the integrity of the fips module */
 288     if (bio_module == NULL
 289             || !verify_integrity(bio_module, st->bio_read_ex_cb,
 290                                  module_checksum, checksum_len, st->libctx,
 291                                  ev, OSSL_SELF_TEST_TYPE_MODULE_INTEGRITY)) {
 292         ERR_raise(ERR_LIB_PROV, PROV_R_MODULE_INTEGRITY_FAILURE);
 293         goto end;
 294     }
 295
 296     /* This will be NULL during installation - so the self test KATS will run */
 297     if (st->indicator_data != NULL) {
 298         /*
 299          * If the kats have already passed indicator is set - then check the
 300          * integrity of the indicator.
 301          */
 302         if (st->indicator_checksum_data == NULL) {
 303             ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_CONFIG_DATA);
 304             goto end;
 305         }
 306         indicator_checksum = OPENSSL_hexstr2buf(st->indicator_checksum_data,
 307                                                 &checksum_len);
 308         if (indicator_checksum == NULL) {
 309             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CONFIG_DATA);
 310             goto end;
 311         }
 312
 313         bio_indicator =
 314             (*st->bio_new_buffer_cb)(st->indicator_data,
 315                                      strlen(st->indicator_data));
 316         if (bio_indicator == NULL
 317                 || !verify_integrity(bio_indicator, st->bio_read_ex_cb,
 318                                      indicator_checksum, checksum_len,
 319                                      st->libctx, ev,
 320                                      OSSL_SELF_TEST_TYPE_INSTALL_INTEGRITY)) {
 321             ERR_raise(ERR_LIB_PROV, PROV_R_INDICATOR_INTEGRITY_FAILURE);
 322             goto end;
 323         } else {
 324             kats_already_passed = 1;
 325         }
 326     }
 327
 328     /* Only runs the KAT's during installation OR on_demand() */
 329     if (on_demand_test || kats_already_passed == 0) {
 330         if (!SELF_TEST_kats(ev, st->libctx)) {
 331             ERR_raise(ERR_LIB_PROV, PROV_R_SELF_TEST_KAT_FAILURE);
 332             goto end;
 333         }
 334     }
 335     ok = 1;
 336 end:
 337     OSSL_SELF_TEST_free(ev);
 338     OPENSSL_free(module_checksum);
 339     OPENSSL_free(indicator_checksum);
 340
 341     if (st != NULL) {
 342         (*st->bio_free_cb)(bio_indicator);
 343         (*st->bio_free_cb)(bio_module);
 344     }
 345     if (ok)
 346         set_fips_state(FIPS_STATE_RUNNING);
 347     else
 348         ossl_set_error_state(OSSL_SELF_TEST_TYPE_NONE);
 349     CRYPTO_THREAD_unlock(self_test_lock);
 350
 351     return ok;
 352 }
 353
 354 void SELF_TEST_disable_conditional_error_state(void)
 355 {
 356     FIPS_conditional_error_check = 0;
 357 }
 358
 359 void ossl_set_error_state(const char *type)
 360 {
 361     int cond_test = (type != NULL && strcmp(type, OSSL_SELF_TEST_TYPE_PCT) == 0);
 362
 363     if (!cond_test || (FIPS_conditional_error_check == 1)) {
 364         set_fips_state(FIPS_STATE_ERROR);
 365         ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_ENTERING_ERROR_STATE);
 366     } else {
 367         ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_CONDITIONAL_ERROR);
 368     }
 369 }
 370
 371 int ossl_prov_is_running(void)
 372 {
 373     int res;
 374     static unsigned int rate_limit = 0;
 375
 376     if (!CRYPTO_THREAD_read_lock(fips_state_lock))
 377         return 0;
 378     res = FIPS_state == FIPS_STATE_RUNNING
 379                         || FIPS_state == FIPS_STATE_SELFTEST;
 380     if (FIPS_state == FIPS_STATE_ERROR) {
 381         CRYPTO_THREAD_unlock(fips_state_lock);
 382         if (!CRYPTO_THREAD_write_lock(fips_state_lock))
 383             return 0;
 384         if (rate_limit++ < FIPS_ERROR_REPORTING_RATE_LIMIT)
 385             ERR_raise(ERR_LIB_PROV, PROV_R_FIPS_MODULE_IN_ERROR_STATE);
 386     }
 387     CRYPTO_THREAD_unlock(fips_state_lock);
 388     return res;
 389 }