fips/fips.c

   1 /* ====================================================================
   2  * Copyright (c) 2011 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 #define OPENSSL_FIPSAPI
  51
  52 #include <openssl/crypto.h>
  53 #include <openssl/rand.h>
  54 #include <openssl/fips_rand.h>
  55 #include <openssl/err.h>
  56 #include <openssl/bio.h>
  57 #include <openssl/hmac.h>
  58 #include <openssl/rsa.h>
  59 #include <openssl/dsa.h>
  60 #include <openssl/ecdsa.h>
  61 #include <string.h>
  62 #include <limits.h>
  63 #include "fips_locl.h"
  64
  65 #ifdef OPENSSL_FIPS
  66
  67 #include <openssl/fips.h>
  68
  69 #ifndef PATH_MAX
  70 #define PATH_MAX 1024
  71 #endif
  72
  73 static int fips_selftest_fail = 0;
  74 static int fips_mode = 0;
  75 static int fips_started = 0;
  76
  77 static int fips_is_owning_thread(void);
  78 static int fips_set_owning_thread(void);
  79 static int fips_clear_owning_thread(void);
  80 static unsigned char *fips_signature_witness(void);
  81
  82 #define fips_w_lock()   CRYPTO_w_lock(CRYPTO_LOCK_FIPS)
  83 #define fips_w_unlock() CRYPTO_w_unlock(CRYPTO_LOCK_FIPS)
  84 #define fips_r_lock()   CRYPTO_r_lock(CRYPTO_LOCK_FIPS)
  85 #define fips_r_unlock() CRYPTO_r_unlock(CRYPTO_LOCK_FIPS)
  86
  87 static void fips_set_mode(int onoff)
  88         {
  89         int owning_thread = fips_is_owning_thread();
  90
  91         if (fips_started)
  92                 {
  93                 if (!owning_thread) fips_w_lock();
  94                 fips_mode = onoff;
  95                 if (!owning_thread) fips_w_unlock();
  96                 }
  97         }
  98
  99 int FIPS_module_mode(void)
 100         {
 101         int ret = 0;
 102         int owning_thread = fips_is_owning_thread();
 103
 104         if (fips_started)
 105                 {
 106                 if (!owning_thread) fips_r_lock();
 107                 ret = fips_mode;
 108                 if (!owning_thread) fips_r_unlock();
 109                 }
 110         return ret;
 111         }
 112
 113 int FIPS_selftest_failed(void)
 114     {
 115     int ret = 0;
 116     if (fips_started)
 117         {
 118         int owning_thread = fips_is_owning_thread();
 119
 120         if (!owning_thread) fips_r_lock();
 121         ret = fips_selftest_fail;
 122         if (!owning_thread) fips_r_unlock();
 123         }
 124     return ret;
 125     }
 126
 127 /* Selftest failure fatal exit routine. This will be called
 128  * during *any* cryptographic operation. It has the minimum
 129  * overhead possible to avoid too big a performance hit.
 130  */
 131
 132 void FIPS_selftest_check(void)
 133     {
 134     if (fips_selftest_fail)
 135         {
 136         OpenSSLDie(__FILE__,__LINE__, "FATAL FIPS SELFTEST FAILURE");
 137         }
 138     }
 139
 140 void fips_set_selftest_fail(void)
 141     {
 142     fips_selftest_fail = 1;
 143     }
 144
 145 extern const void         *FIPS_text_start(),  *FIPS_text_end();
 146 extern const unsigned char FIPS_rodata_start[], FIPS_rodata_end[];
 147 unsigned char              FIPS_signature [20] = { 0 };
 148 static const char          FIPS_hmac_key[]="etaonrishdlcupfm";
 149
 150 unsigned int FIPS_incore_fingerprint(unsigned char *sig,unsigned int len)
 151     {
 152     const unsigned char *p1 = FIPS_text_start();
 153     const unsigned char *p2 = FIPS_text_end();
 154     const unsigned char *p3 = FIPS_rodata_start;
 155     const unsigned char *p4 = FIPS_rodata_end;
 156     HMAC_CTX c;
 157
 158     HMAC_CTX_init(&c);
 159     HMAC_Init(&c,FIPS_hmac_key,strlen(FIPS_hmac_key),EVP_sha1());
 160
 161     /* detect overlapping regions */
 162     if (p1<=p3 && p2>=p3)
 163         p3=p1, p4=p2>p4?p2:p4, p1=NULL, p2=NULL;
 164     else if (p3<=p1 && p4>=p1)
 165         p3=p3, p4=p2>p4?p2:p4, p1=NULL, p2=NULL;
 166
 167     if (p1)
 168         HMAC_Update(&c,p1,(size_t)p2-(size_t)p1);
 169
 170     if (FIPS_signature>=p3 && FIPS_signature<p4)
 171         {
 172         /* "punch" hole */
 173         HMAC_Update(&c,p3,(size_t)FIPS_signature-(size_t)p3);
 174         p3 = FIPS_signature+sizeof(FIPS_signature);
 175         if (p3<p4)
 176             HMAC_Update(&c,p3,(size_t)p4-(size_t)p3);
 177         }
 178     else
 179         HMAC_Update(&c,p3,(size_t)p4-(size_t)p3);
 180
 181     if (!fips_post_corrupt(FIPS_TEST_INTEGRITY, 0, NULL))
 182         HMAC_Update(&c, (unsigned char *)FIPS_hmac_key, 1);
 183
 184     HMAC_Final(&c,sig,&len);
 185     HMAC_CTX_cleanup(&c);
 186
 187     return len;
 188     }
 189
 190 int FIPS_check_incore_fingerprint(void)
 191     {
 192     unsigned char sig[EVP_MAX_MD_SIZE];
 193     unsigned int len;
 194     int rv = 0;
 195 #if defined(__sgi) && (defined(__mips) || defined(mips))
 196     extern int __dso_displacement[];
 197 #else
 198     extern int OPENSSL_NONPIC_relocated;
 199 #endif
 200
 201     if (!fips_post_started(FIPS_TEST_INTEGRITY, 0, NULL))
 202         return 1;
 203
 204     if (FIPS_text_start()==NULL)
 205         {
 206         FIPSerr(FIPS_F_FIPS_CHECK_INCORE_FINGERPRINT,FIPS_R_UNSUPPORTED_PLATFORM);
 207         goto err;
 208         }
 209
 210     len=FIPS_incore_fingerprint(sig,sizeof(sig));
 211
 212     if (len!=sizeof(FIPS_signature) ||
 213         memcmp(FIPS_signature,sig,sizeof(FIPS_signature)))
 214         {
 215         if (FIPS_signature>=FIPS_rodata_start && FIPS_signature<FIPS_rodata_end)
 216             FIPSerr(FIPS_F_FIPS_CHECK_INCORE_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH_SEGMENT_ALIASING);
 217 #if defined(__sgi) && (defined(__mips) || defined(mips))
 218         else if (__dso_displacement!=NULL)
 219 #else
 220         else if (OPENSSL_NONPIC_relocated)
 221 #endif
 222             FIPSerr(FIPS_F_FIPS_CHECK_INCORE_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH_NONPIC_RELOCATED);
 223         else
 224             FIPSerr(FIPS_F_FIPS_CHECK_INCORE_FINGERPRINT,FIPS_R_FINGERPRINT_DOES_NOT_MATCH);
 225 #ifdef OPENSSL_FIPS_DEBUGGER
 226         rv = 1;
 227 #endif
 228         goto err;
 229         }
 230     rv = 1;
 231     err:
 232     if (rv == 0)
 233         fips_post_failed(FIPS_TEST_INTEGRITY, 0, NULL);
 234     else
 235         if (!fips_post_success(FIPS_TEST_INTEGRITY, 0, NULL))
 236                 return 0;
 237     return rv;
 238     }
 239
 240 int FIPS_module_mode_set(int onoff)
 241     {
 242     int fips_set_owning_thread();
 243     int fips_clear_owning_thread();
 244     int ret = 0;
 245
 246     fips_w_lock();
 247     fips_started = 1;
 248     fips_set_owning_thread();
 249
 250     if(onoff)
 251         {
 252
 253         fips_selftest_fail = 0;
 254
 255         /* Don't go into FIPS mode twice, just so we can do automagic
 256            seeding */
 257         if(FIPS_module_mode())
 258             {
 259             FIPSerr(FIPS_F_FIPS_MODE_SET,FIPS_R_FIPS_MODE_ALREADY_SET);
 260             fips_selftest_fail = 1;
 261             ret = 0;
 262             goto end;
 263             }
 264
 265 #ifdef OPENSSL_IA32_SSE2
 266         if ((OPENSSL_ia32cap & (1<<25|1<<26)) != (1<<25|1<<26))
 267             {
 268             FIPSerr(FIPS_F_FIPS_MODE_SET,FIPS_R_UNSUPPORTED_PLATFORM);
 269             fips_selftest_fail = 1;
 270             ret = 0;
 271             goto end;
 272             }
 273 #endif
 274
 275         if(fips_signature_witness() != FIPS_signature)
 276             {
 277             FIPSerr(FIPS_F_FIPS_MODE_SET,FIPS_R_CONTRADICTING_EVIDENCE);
 278             fips_selftest_fail = 1;
 279             ret = 0;
 280             goto end;
 281             }
 282
 283         if(FIPS_selftest())
 284             fips_set_mode(onoff);
 285         else
 286             {
 287             fips_selftest_fail = 1;
 288             ret = 0;
 289             goto end;
 290             }
 291         ret = 1;
 292         goto end;
 293         }
 294     fips_set_mode(0);
 295     fips_selftest_fail = 0;
 296     ret = 1;
 297 end:
 298     fips_clear_owning_thread();
 299     fips_w_unlock();
 300     return ret;
 301     }
 302
 303 static CRYPTO_THREADID fips_thread;
 304 static int fips_thread_set = 0;
 305
 306 static int fips_is_owning_thread(void)
 307         {
 308         int ret = 0;
 309
 310         if (fips_started)
 311                 {
 312                 CRYPTO_r_lock(CRYPTO_LOCK_FIPS2);
 313                 if (fips_thread_set)
 314                         {
 315                         CRYPTO_THREADID cur;
 316                         CRYPTO_THREADID_current(&cur);
 317                         if (!CRYPTO_THREADID_cmp(&cur, &fips_thread))
 318                                 ret = 1;
 319                         }
 320                 CRYPTO_r_unlock(CRYPTO_LOCK_FIPS2);
 321                 }
 322         return ret;
 323         }
 324
 325 int fips_set_owning_thread(void)
 326         {
 327         int ret = 0;
 328
 329         if (fips_started)
 330                 {
 331                 CRYPTO_w_lock(CRYPTO_LOCK_FIPS2);
 332                 if (!fips_thread_set)
 333                         {
 334                         CRYPTO_THREADID_current(&fips_thread);
 335                         ret = 1;
 336                         fips_thread_set = 1;
 337                         }
 338                 CRYPTO_w_unlock(CRYPTO_LOCK_FIPS2);
 339                 }
 340         return ret;
 341         }
 342
 343 int fips_clear_owning_thread(void)
 344         {
 345         int ret = 0;
 346
 347         if (fips_started)
 348                 {
 349                 CRYPTO_w_lock(CRYPTO_LOCK_FIPS2);
 350                 if (fips_thread_set)
 351                         {
 352                         CRYPTO_THREADID cur;
 353                         CRYPTO_THREADID_current(&cur);
 354                         if (!CRYPTO_THREADID_cmp(&cur, &fips_thread))
 355                                 fips_thread_set = 0;
 356                         }
 357                 CRYPTO_w_unlock(CRYPTO_LOCK_FIPS2);
 358                 }
 359         return ret;
 360         }
 361
 362 unsigned char *fips_signature_witness(void)
 363         {
 364         extern unsigned char FIPS_signature[];
 365         return FIPS_signature;
 366         }
 367
 368 #if 0
 369 /* The purpose of this is to ensure the error code exists and the function
 370  * name is to keep the error checking script quiet
 371  */
 372 void hash_final(void)
 373         {
 374         FIPSerr(FIPS_F_HASH_FINAL,FIPS_R_NON_FIPS_METHOD);
 375         }
 376 #endif
 377
 378
 379 #endif