fips-1.0/fips.c

   1 /* ====================================================================
   2  * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@openssl.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  *
  48  */
  49
  50 #include <openssl/fips.h>
  51 #include <openssl/rand.h>
  52 #include <openssl/fips_rand.h>
  53 #include <openssl/err.h>
  54 #include <openssl/bio.h>
  55 #include <openssl/hmac.h>
  56 #include <openssl/rsa.h>
  57 #include <string.h>
  58 #include <limits.h>
  59 #include "fips_locl.h"
  60
  61 #ifdef OPENSSL_FIPS
  62
  63 #ifndef PATH_MAX
  64 #define PATH_MAX 1024
  65 #endif
  66
  67 static int fips_selftest_fail;
  68 static int fips_mode;
  69 static const void *fips_rand_check;
  70
  71 static void fips_set_mode(int onoff)
  72         {
  73         int owning_thread = fips_is_owning_thread();
  74
  75         if (fips_is_started())
  76                 {
  77                 if (!owning_thread) fips_w_lock();
  78                 fips_mode = onoff;
  79                 if (!owning_thread) fips_w_unlock();
  80                 }
  81         }
  82
  83 static void fips_set_rand_check(const void *rand_check)
  84         {
  85         int owning_thread = fips_is_owning_thread();
  86
  87         if (fips_is_started())
  88                 {
  89                 if (!owning_thread) fips_w_lock();
  90                 fips_rand_check = rand_check;
  91                 if (!owning_thread) fips_w_unlock();
  92                 }
  93         }
  94
  95 int FIPS_mode(void)
  96         {
  97         int ret = 0;
  98         int owning_thread = fips_is_owning_thread();
  99
 100         if (fips_is_started())
 101                 {
 102                 if (!owning_thread) fips_r_lock();
 103                 ret = fips_mode;
 104                 if (!owning_thread) fips_r_unlock();
 105                 }
 106         return ret;
 107         }
 108
 109 const void *FIPS_rand_check(void)
 110         {
 111         const void *ret = 0;
 112         int owning_thread = fips_is_owning_thread();
 113
 114         if (fips_is_started())
 115                 {
 116                 if (!owning_thread) fips_r_lock();
 117                 ret = fips_rand_check;
 118                 if (!owning_thread) fips_r_unlock();
 119                 }
 120         return ret;
 121         }
 122
 123 int FIPS_selftest_failed(void)
 124     {
 125     int ret = 0;
 126     if (fips_is_started())
 127         {
 128         int owning_thread = fips_is_owning_thread();
 129
 130         if (!owning_thread) fips_r_lock();
 131         ret = fips_selftest_fail;
 132         if (!owning_thread) fips_r_unlock();
 133         }
 134     return ret;
 135     }
 136
 137 /* Selftest failure fatal exit routine. This will be called
 138  * during *any* cryptographic operation. It has the minimum
 139  * overhead possible to avoid too big a performance hit.
 140  */
 141
 142 void FIPS_selftest_check(void)
 143     {
 144     if (fips_selftest_fail)
 145         {
 146         OpenSSLDie(__FILE__,__LINE__, "FATAL FIPS SELFTEST FAILURE");
 147         }
 148     }
 149
 150 int FIPS_selftest()
 151     {
 152
 153     return FIPS_selftest_sha1()
 154         && FIPS_selftest_hmac()
 155         && FIPS_selftest_aes()
 156         && FIPS_selftest_des()
 157         && FIPS_selftest_rsa()
 158         && FIPS_selftest_dsa();
 159     }
 160
 161 extern const void         *FIPS_text_start(),  *FIPS_text_end();
 162 extern const unsigned char FIPS_rodata_start[], FIPS_rodata_end[];
 163 unsigned char              FIPS_signature [20] = { 0 };
 164 static const char          FIPS_hmac_key[]="etaonrishdlcupfm";
 165
 166 unsigned int FIPS_incore_fingerprint(unsigned char *sig,unsigned int len)
 167     {
 168     const unsigned char *p1 = FIPS_text_start();
 169     const unsigned char *p2 = FIPS_text_end();
 170     const unsigned char *p3 = FIPS_rodata_start;
 171     const unsigned char *p4 = FIPS_rodata_end;
 172     HMAC_CTX c;
 173
 174     HMAC_CTX_init(&c);
 175     HMAC_Init(&c,FIPS_hmac_key,strlen(FIPS_hmac_key),EVP_sha1());
 176
 177     /* detect overlapping regions */
 178     if (p1<=p3 && p2>=p3)
 179         p3=p1, p4=p2>p4?p2:p4, p1=NULL, p2=NULL;
 180     else if (p3<=p1 && p4>=p1)
 181         p3=p3, p4=p2>p4?p2:p4, p1=NULL, p2=NULL;
 182
 183     if (p1)
 184         HMAC_Update(&c,p1,(size_t)p2-(size_t)p1);
 185
 186     if (FIPS_signature>=p3 && FIPS_signature<p4)
 187         {
 188         /* "punch" hole */
 189         HMAC_Update(&c,p3,(size_t)FIPS_signature-(size_t)p3);
 190         p3 = FIPS_signature+sizeof(FIPS_signature);
 191         if (p3<p4)
 192             HMAC_Update(&c,p3,(size_t)p4-(size_t)p3);
 193         }
 194     else
 195         HMAC_Update(&c,p3,(size_t)p4-(size_t)p3);
 196
 197     HMAC_Final(&c,sig,&len);
 198     HMAC_CTX_cleanup(&c);
 199
 200     return len;
 201     }
 202
 203 int FIPS_check_incore_fingerprint(void)
 204     {
 205     unsigned char sig[EVP_MAX_MD_SIZE];
 206     unsigned int len;
 207     extern int OPENSSL_NONPIC_relocated;
 208
 209     if (FIPS_text_start()==NULL)
 210         {
 211         FIPSerr(FIPS_F_FIPS_CHECK_FINGERPRINT,FIPS_R_UNSUPPORTED_PLATFORM);
 212         return 0;
 213         }
 214
 215     len=FIPS_incore_fingerprint (sig,sizeof(sig));
 216
 217     if (len!=sizeof(FIPS_signature) ||
 218         memcmp(FIPS_signature,sig,sizeof(FIPS_signature)))
 219         {
 220         if (FIPS_signature>=FIPS_rodata_start && FIPS_signature<FIPS_rodata_end)
 221             FIPSerr(FIPS_F_FIPS_CHECK_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH_SEGMENT_ALIASING);
 222         else if (OPENSSL_NONPIC_relocated)
 223             FIPSerr(FIPS_F_FIPS_CHECK_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH_NONPIC_RELOCATED);
 224         else
 225             FIPSerr(FIPS_F_FIPS_CHECK_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH);
 226         return 0;
 227         }
 228
 229     return 1;
 230     }
 231
 232 int FIPS_mode_set(int onoff)
 233     {
 234     int fips_set_owning_thread();
 235     int fips_clear_owning_thread();
 236     int ret = 0;
 237
 238     fips_w_lock();
 239     fips_set_started();
 240     fips_set_owning_thread();
 241
 242     if(onoff)
 243         {
 244         unsigned char buf[48];
 245
 246         fips_selftest_fail = 0;
 247
 248         /* Don't go into FIPS mode twice, just so we can do automagic
 249            seeding */
 250         if(FIPS_mode())
 251             {
 252             FIPSerr(FIPS_F_FIPS_MODE_SET,FIPS_R_FIPS_MODE_ALREADY_SET);
 253             fips_selftest_fail = 1;
 254             ret = 0;
 255             goto end;
 256             }
 257
 258         if(fips_signature_witness() != FIPS_signature)
 259             {
 260             FIPSerr(FIPS_F_FIPS_MODE_SET,FIPS_R_CONTRADICTING_EVIDENCE);
 261             fips_selftest_fail = 1;
 262             ret = 0;
 263             goto end;
 264             }
 265
 266         if(!FIPS_check_incore_fingerprint())
 267             {
 268             fips_selftest_fail = 1;
 269             ret = 0;
 270             goto end;
 271             }
 272
 273         /* Perform RNG KAT before seeding */
 274         if (!FIPS_selftest_rng())
 275             {
 276             fips_selftest_fail = 1;
 277             ret = 0;
 278             goto end;
 279             }
 280
 281         /* automagically seed PRNG if not already seeded */
 282         if(!FIPS_rand_status())
 283             {
 284             if(RAND_bytes(buf,sizeof buf) <= 0)
 285                 {
 286                 fips_selftest_fail = 1;
 287                 ret = 0;
 288                 goto end;
 289                 }
 290             FIPS_rand_set_key(buf,32);
 291             FIPS_rand_seed(buf+32,16);
 292             }
 293
 294         /* now switch into FIPS mode */
 295         fips_set_rand_check(FIPS_rand_method());
 296         RAND_set_rand_method(FIPS_rand_method());
 297         if(FIPS_selftest())
 298             fips_set_mode(1);
 299         else
 300             {
 301             fips_selftest_fail = 1;
 302             ret = 0;
 303             goto end;
 304             }
 305         ret = 1;
 306         goto end;
 307         }
 308     fips_set_mode(0);
 309     fips_selftest_fail = 0;
 310     ret = 1;
 311 end:
 312     fips_clear_owning_thread();
 313     fips_w_unlock();
 314     return ret;
 315     }
 316
 317 #if 0
 318 /* here just to cause error codes to exist */
 319 static void dummy()
 320     {
 321     FIPSerr(FIPS_F_HASH_FINAL,FIPS_F_NON_FIPS_METHOD);
 322     FIPSerr(FIPS_F_HASH_FINAL,FIPS_R_FIPS_SELFTEST_FAILED);
 323     }
 324 #endif
 325
 326 void fips_w_lock(void)          { CRYPTO_w_lock(CRYPTO_LOCK_FIPS); }
 327 void fips_w_unlock(void)        { CRYPTO_w_unlock(CRYPTO_LOCK_FIPS); }
 328 void fips_r_lock(void)          { CRYPTO_r_lock(CRYPTO_LOCK_FIPS); }
 329 void fips_r_unlock(void)        { CRYPTO_r_unlock(CRYPTO_LOCK_FIPS); }
 330
 331 static int fips_started = 0;
 332 static unsigned long fips_thread = 0;
 333
 334 void fips_set_started(void)
 335         {
 336         fips_started = 1;
 337         }
 338
 339 int fips_is_started(void)
 340         {
 341         return fips_started;
 342         }
 343
 344 int fips_is_owning_thread(void)
 345         {
 346         int ret = 0;
 347
 348         if (fips_is_started())
 349                 {
 350                 CRYPTO_r_lock(CRYPTO_LOCK_FIPS2);
 351                 if (fips_thread != 0 && fips_thread == CRYPTO_thread_id())
 352                         ret = 1;
 353                 CRYPTO_r_unlock(CRYPTO_LOCK_FIPS2);
 354                 }
 355         return ret;
 356         }
 357
 358 int fips_set_owning_thread(void)
 359         {
 360         int ret = 0;
 361
 362         if (fips_is_started())
 363                 {
 364                 CRYPTO_w_lock(CRYPTO_LOCK_FIPS2);
 365                 if (fips_thread == 0)
 366                         {
 367                         fips_thread = CRYPTO_thread_id();
 368                         ret = 1;
 369                         }
 370                 CRYPTO_w_unlock(CRYPTO_LOCK_FIPS2);
 371                 }
 372         return ret;
 373         }
 374
 375 int fips_clear_owning_thread(void)
 376         {
 377         int ret = 0;
 378
 379         if (fips_is_started())
 380                 {
 381                 CRYPTO_w_lock(CRYPTO_LOCK_FIPS2);
 382                 if (fips_thread == CRYPTO_thread_id())
 383                         {
 384                         fips_thread = 0;
 385                         ret = 1;
 386                         }
 387                 CRYPTO_w_unlock(CRYPTO_LOCK_FIPS2);
 388                 }
 389         return ret;
 390         }
 391
 392 unsigned char *fips_signature_witness(void)
 393         {
 394         extern unsigned char FIPS_signature[];
 395         return FIPS_signature;
 396         }
 397
 398 /* Generalized public key test routine. Signs and verifies the data
 399  * supplied in tbs using mesage digest md and setting option digest
 400  * flags md_flags. If the 'kat' parameter is not NULL it will
 401  * additionally check the signature matches it: a known answer test
 402  * The string "fail_str" is used for identification purposes in case
 403  * of failure.
 404  */
 405
 406 int fips_pkey_signature_test(EVP_PKEY *pkey,
 407                         const unsigned char *tbs, int tbslen,
 408                         const unsigned char *kat, unsigned int katlen,
 409                         const EVP_MD *digest, unsigned int md_flags,
 410                         const char *fail_str)
 411         {
 412         int ret = 0;
 413         unsigned char sigtmp[256], *sig = sigtmp;
 414         unsigned int siglen;
 415         EVP_MD_CTX mctx;
 416         EVP_MD_CTX_init(&mctx);
 417
 418         if ((pkey->type == EVP_PKEY_RSA)
 419                 && (RSA_size(pkey->pkey.rsa) > sizeof(sigtmp)))
 420                 {
 421                 sig = OPENSSL_malloc(RSA_size(pkey->pkey.rsa));
 422                 if (!sig)
 423                         {
 424                         FIPSerr(FIPS_F_FIPS_CHECK_PK_SIG,ERR_R_MALLOC_FAILURE);
 425                         return 0;
 426                         }
 427                 }
 428
 429         if (tbslen == -1)
 430                 tbslen = strlen((char *)tbs);
 431
 432         if (md_flags)
 433                 M_EVP_MD_CTX_set_flags(&mctx, md_flags);
 434
 435         if (!EVP_SignInit_ex(&mctx, digest, NULL))
 436                 goto error;
 437         if (!EVP_SignUpdate(&mctx, tbs, tbslen))
 438                 goto error;
 439         if (!EVP_SignFinal(&mctx, sig, &siglen, pkey))
 440                 goto error;
 441
 442         if (kat && ((siglen != katlen) || memcmp(kat, sig, katlen)))
 443                 goto error;
 444
 445         if (!EVP_VerifyInit_ex(&mctx, digest, NULL))
 446                 goto error;
 447         if (!EVP_VerifyUpdate(&mctx, tbs, tbslen))
 448                 goto error;
 449         ret = EVP_VerifyFinal(&mctx, sig, siglen, pkey);
 450
 451         error:
 452         if (sig != sigtmp)
 453                 OPENSSL_free(sig);
 454         EVP_MD_CTX_cleanup(&mctx);
 455         if (ret != 1)
 456                 {
 457                 FIPSerr(FIPS_F_FIPS_PKEY_SIGNATURE_TEST,FIPS_R_TEST_FAILURE);
 458                 if (fail_str)
 459                         ERR_add_error_data(2, "Type=", fail_str);
 460                 return 0;
 461                 }
 462         return 1;
 463         }
 464
 465 #endif