providers/fips/fipsprov.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 <string.h>
  11 #include <stdio.h>
  12 #include <openssl/core.h>
  13 #include <openssl/core_numbers.h>
  14 #include <openssl/core_names.h>
  15 #include <openssl/params.h>
  16 #include <openssl/err.h>
  17 #include <openssl/evp.h>
  18
  19 /* TODO(3.0): Needed for dummy_evp_call(). To be removed */
  20 #include <openssl/sha.h>
  21 #include <openssl/rand_drbg.h>
  22
  23 #include "internal/cryptlib.h"
  24 #include "internal/property.h"
  25 #include "internal/evp_int.h"
  26 #include "internal/provider_algs.h"
  27 #include "internal/provider_ctx.h"
  28 #include "internal/providercommon.h"
  29
  30 /*
  31  * TODO(3.0): Should these be stored in the provider side provctx? Could they
  32  * ever be different from one init to the next? Unfortunately we can't do this
  33  * at the moment because c_put_error/c_add_error_vdata do not provide us with
  34  * the OPENSSL_CTX as a parameter.
  35  */
  36 /* Functions provided by the core */
  37 static OSSL_core_get_param_types_fn *c_get_param_types = NULL;
  38 static OSSL_core_get_params_fn *c_get_params = NULL;
  39 extern OSSL_core_thread_start_fn *c_thread_start;
  40 OSSL_core_thread_start_fn *c_thread_start = NULL;
  41 static OSSL_core_put_error_fn *c_put_error = NULL;
  42 static OSSL_core_add_error_vdata_fn *c_add_error_vdata = NULL;
  43
  44 typedef struct fips_global_st {
  45     const OSSL_PROVIDER *prov;
  46 } FIPS_GLOBAL;
  47
  48 static void *fips_prov_ossl_ctx_new(OPENSSL_CTX *libctx)
  49 {
  50     FIPS_GLOBAL *fgbl = OPENSSL_zalloc(sizeof(*fgbl));
  51
  52     return fgbl;
  53 }
  54
  55 static void fips_prov_ossl_ctx_free(void *fgbl)
  56 {
  57     OPENSSL_free(fgbl);
  58 }
  59
  60 static const OPENSSL_CTX_METHOD fips_prov_ossl_ctx_method = {
  61     fips_prov_ossl_ctx_new,
  62     fips_prov_ossl_ctx_free,
  63 };
  64
  65
  66 /* Parameters we provide to the core */
  67 static const OSSL_ITEM fips_param_types[] = {
  68     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_NAME },
  69     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_VERSION },
  70     { OSSL_PARAM_UTF8_PTR, OSSL_PROV_PARAM_BUILDINFO },
  71     { 0, NULL }
  72 };
  73
  74 /* TODO(3.0): To be removed */
  75 static int dummy_evp_call(void *provctx)
  76 {
  77     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
  78     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
  79     EVP_MD *sha256 = EVP_MD_fetch(libctx, "SHA256", NULL);
  80     char msg[] = "Hello World!";
  81     const unsigned char exptd[] = {
  82         0x7f, 0x83, 0xb1, 0x65, 0x7f, 0xf1, 0xfc, 0x53, 0xb9, 0x2d, 0xc1, 0x81,
  83         0x48, 0xa1, 0xd6, 0x5d, 0xfc, 0x2d, 0x4b, 0x1f, 0xa3, 0xd6, 0x77, 0x28,
  84         0x4a, 0xdd, 0xd2, 0x00, 0x12, 0x6d, 0x90, 0x69
  85     };
  86     unsigned int dgstlen = 0;
  87     unsigned char dgst[SHA256_DIGEST_LENGTH];
  88     int ret = 0;
  89     BN_CTX *bnctx = NULL;
  90     BIGNUM *a = NULL, *b = NULL;
  91     unsigned char randbuf[128];
  92     RAND_DRBG *drbg = OPENSSL_CTX_get0_public_drbg(libctx);
  93
  94     if (ctx == NULL || sha256 == NULL || drbg == NULL)
  95         goto err;
  96
  97     if (!EVP_DigestInit_ex(ctx, sha256, NULL))
  98         goto err;
  99     if (!EVP_DigestUpdate(ctx, msg, sizeof(msg) - 1))
 100         goto err;
 101     if (!EVP_DigestFinal(ctx, dgst, &dgstlen))
 102         goto err;
 103     if (dgstlen != sizeof(exptd) || memcmp(dgst, exptd, sizeof(exptd)) != 0)
 104         goto err;
 105
 106     bnctx = BN_CTX_new_ex(libctx);
 107     if (bnctx == NULL)
 108         goto err;
 109     BN_CTX_start(bnctx);
 110     a = BN_CTX_get(bnctx);
 111     b = BN_CTX_get(bnctx);
 112     if (b == NULL)
 113         goto err;
 114     BN_zero(a);
 115     if (!BN_one(b)
 116         || !BN_add(a, a, b)
 117         || BN_cmp(a, b) != 0)
 118         goto err;
 119
 120     if (RAND_DRBG_bytes(drbg, randbuf, sizeof(randbuf)) <= 0)
 121         goto err;
 122
 123     ret = 1;
 124  err:
 125     BN_CTX_end(bnctx);
 126     BN_CTX_free(bnctx);
 127
 128     EVP_MD_CTX_free(ctx);
 129     EVP_MD_meth_free(sha256);
 130     return ret;
 131 }
 132
 133 static const OSSL_ITEM *fips_get_param_types(const OSSL_PROVIDER *prov)
 134 {
 135     return fips_param_types;
 136 }
 137
 138 static int fips_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[])
 139 {
 140     OSSL_PARAM *p;
 141
 142     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_NAME);
 143     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "OpenSSL FIPS Provider"))
 144         return 0;
 145     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_VERSION);
 146     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR))
 147         return 0;
 148     p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_BUILDINFO);
 149     if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, OPENSSL_FULL_VERSION_STR))
 150         return 0;
 151
 152     return 1;
 153 }
 154
 155 /* FIPS specific version of the function of the same name in provlib.c */
 156 const char *ossl_prov_util_nid_to_name(int nid)
 157 {
 158     /* We don't have OBJ_nid2n() in FIPS_MODE so we have an explicit list */
 159
 160     switch (nid) {
 161     /* Digests */
 162     case NID_sha1:
 163         return "SHA224";
 164     case NID_sha224:
 165         return "SHA224";
 166     case NID_sha256:
 167         return "SHA256";
 168     case NID_sha384:
 169         return "SHA384";
 170     case NID_sha512:
 171         return "SHA512";
 172     case NID_sha512_224:
 173         return "SHA512-224";
 174     case NID_sha512_256:
 175         return "SHA512-256";
 176     case NID_sha3_224:
 177         return "SHA3-224";
 178     case NID_sha3_256:
 179         return "SHA3-256";
 180     case NID_sha3_384:
 181         return "SHA3-384";
 182     case NID_sha3_512:
 183         return "SHA3-512";
 184
 185     /* Ciphers */
 186     case NID_aes_256_ecb:
 187         return "AES-256-ECB";
 188     case NID_aes_192_ecb:
 189         return "AES-192-ECB";
 190     case NID_aes_128_ecb:
 191         return "AES-128-ECB";
 192     case NID_aes_256_cbc:
 193         return "AES-256-CBC";
 194     case NID_aes_192_cbc:
 195         return "AES-192-CBC";
 196     case NID_aes_128_cbc:
 197         return "AES-128-CBC";
 198     case NID_aes_256_ctr:
 199         return "AES-256-CTR";
 200     case NID_aes_192_ctr:
 201         return "AES-192-CTR";
 202     case NID_aes_128_ctr:
 203         return "AES-128-CTR";
 204     }
 205
 206     return NULL;
 207 }
 208
 209 static const OSSL_ALGORITHM fips_digests[] = {
 210     { "SHA1", "fips=yes", sha1_functions },
 211     { "SHA224", "fips=yes", sha224_functions },
 212     { "SHA256", "fips=yes", sha256_functions },
 213     { "SHA384", "fips=yes", sha384_functions },
 214     { "SHA512", "fips=yes", sha512_functions },
 215     { "SHA512-224", "fips=yes", sha512_224_functions },
 216     { "SHA512-256", "fips=yes", sha512_256_functions },
 217     { "SHA3-224", "fips=yes", sha3_224_functions },
 218     { "SHA3-256", "fips=yes", sha3_256_functions },
 219     { "SHA3-384", "fips=yes", sha3_384_functions },
 220     { "SHA3-512", "fips=yes", sha3_512_functions },
 221     { "KMAC128", "fips=yes", keccak_kmac_128_functions },
 222     { "KMAC256", "fips=yes", keccak_kmac_256_functions },
 223
 224     { NULL, NULL, NULL }
 225 };
 226
 227 static const OSSL_ALGORITHM fips_ciphers[] = {
 228     { "AES-256-ECB", "fips=yes", aes256ecb_functions },
 229     { "AES-192-ECB", "fips=yes", aes192ecb_functions },
 230     { "AES-128-ECB", "fips=yes", aes128ecb_functions },
 231     { "AES-256-CBC", "fips=yes", aes256cbc_functions },
 232     { "AES-192-CBC", "fips=yes", aes192cbc_functions },
 233     { "AES-128-CBC", "fips=yes", aes128cbc_functions },
 234     { "AES-256-CTR", "fips=yes", aes256ctr_functions },
 235     { "AES-192-CTR", "fips=yes", aes192ctr_functions },
 236     { "AES-128-CTR", "fips=yes", aes128ctr_functions },
 237     { NULL, NULL, NULL }
 238 };
 239
 240 static const OSSL_ALGORITHM *fips_query(OSSL_PROVIDER *prov,
 241                                          int operation_id,
 242                                          int *no_cache)
 243 {
 244     *no_cache = 0;
 245     switch (operation_id) {
 246     case OSSL_OP_DIGEST:
 247         return fips_digests;
 248     case OSSL_OP_CIPHER:
 249         return fips_ciphers;
 250     }
 251     return NULL;
 252 }
 253
 254 /* Functions we provide to the core */
 255 static const OSSL_DISPATCH fips_dispatch_table[] = {
 256     /*
 257      * To release our resources we just need to free the OPENSSL_CTX so we just
 258      * use OPENSSL_CTX_free directly as our teardown function
 259      */
 260     { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))OPENSSL_CTX_free },
 261     { OSSL_FUNC_PROVIDER_GET_PARAM_TYPES, (void (*)(void))fips_get_param_types },
 262     { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))fips_get_params },
 263     { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))fips_query },
 264     { 0, NULL }
 265 };
 266
 267 /* Functions we provide to ourself */
 268 static const OSSL_DISPATCH intern_dispatch_table[] = {
 269     { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))fips_query },
 270     { 0, NULL }
 271 };
 272
 273
 274 int OSSL_provider_init(const OSSL_PROVIDER *provider,
 275                        const OSSL_DISPATCH *in,
 276                        const OSSL_DISPATCH **out,
 277                        void **provctx)
 278 {
 279     FIPS_GLOBAL *fgbl;
 280     OPENSSL_CTX *ctx;
 281
 282     for (; in->function_id != 0; in++) {
 283         switch (in->function_id) {
 284         case OSSL_FUNC_CORE_GET_PARAM_TYPES:
 285             c_get_param_types = OSSL_get_core_get_param_types(in);
 286             break;
 287         case OSSL_FUNC_CORE_GET_PARAMS:
 288             c_get_params = OSSL_get_core_get_params(in);
 289             break;
 290         case OSSL_FUNC_CORE_THREAD_START:
 291             c_thread_start = OSSL_get_core_thread_start(in);
 292             break;
 293         case OSSL_FUNC_CORE_PUT_ERROR:
 294             c_put_error = OSSL_get_core_put_error(in);
 295             break;
 296         case OSSL_FUNC_CORE_ADD_ERROR_VDATA:
 297             c_add_error_vdata = OSSL_get_core_add_error_vdata(in);
 298             break;
 299         /* Just ignore anything we don't understand */
 300         default:
 301             break;
 302         }
 303     }
 304
 305     ctx = OPENSSL_CTX_new();
 306     if (ctx == NULL)
 307         return 0;
 308
 309     fgbl = openssl_ctx_get_data(ctx, OPENSSL_CTX_FIPS_PROV_INDEX,
 310                                 &fips_prov_ossl_ctx_method);
 311
 312     if (fgbl == NULL)
 313         goto err;
 314
 315     fgbl->prov = provider;
 316
 317     *out = fips_dispatch_table;
 318     *provctx = ctx;
 319
 320     /*
 321      * TODO(3.0): Remove me. This is just a dummy call to demonstrate making
 322      * EVP calls from within the FIPS module.
 323      */
 324     if (!dummy_evp_call(*provctx)) {
 325         OPENSSL_CTX_free(*provctx);
 326         *provctx = NULL;
 327         return 0;
 328     }
 329
 330     return 1;
 331
 332  err:
 333     OPENSSL_CTX_free(ctx);
 334     return 0;
 335 }
 336
 337 /*
 338  * The internal init function used when the FIPS module uses EVP to call
 339  * another algorithm also in the FIPS module. This is a recursive call that has
 340  * been made from within the FIPS module itself. To make this work, we populate
 341  * the provider context of this inner instance with the same library context
 342  * that was used in the EVP call that initiated this recursive call.
 343  */
 344 OSSL_provider_init_fn fips_intern_provider_init;
 345 int fips_intern_provider_init(const OSSL_PROVIDER *provider,
 346                               const OSSL_DISPATCH *in,
 347                               const OSSL_DISPATCH **out,
 348                               void **provctx)
 349 {
 350     OSSL_core_get_library_context_fn *c_get_libctx = NULL;
 351
 352     for (; in->function_id != 0; in++) {
 353         switch (in->function_id) {
 354         case OSSL_FUNC_CORE_GET_LIBRARY_CONTEXT:
 355             c_get_libctx = OSSL_get_core_get_library_context(in);
 356             break;
 357         default:
 358             break;
 359         }
 360     }
 361
 362     if (c_get_libctx == NULL)
 363         return 0;
 364
 365     *provctx = c_get_libctx(provider);
 366
 367     /*
 368      * Safety measure...  we should get the library context that was
 369      * created up in OSSL_provider_init().
 370      */
 371     if (*provctx == NULL)
 372         return 0;
 373
 374     *out = intern_dispatch_table;
 375     return 1;
 376 }
 377
 378 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
 379 {
 380     /*
 381      * TODO(3.0) the first argument is currently NULL but is expected to
 382      * be passed something else in the future, either an OSSL_PROVIDER or
 383      * a OPENSSL_CTX pointer.
 384      */
 385     c_put_error(NULL, ERR_PACK(lib, func, reason), file, line);
 386     ERR_add_error_data(1, "(in the FIPS module)");
 387 }
 388
 389 void ERR_add_error_data(int num, ...)
 390 {
 391     va_list args;
 392
 393     va_start(args, num);
 394     ERR_add_error_vdata(num, args);
 395     va_end(args);
 396 }
 397
 398 void ERR_add_error_vdata(int num, va_list args)
 399 {
 400     c_add_error_vdata(NULL, num, args);
 401 }
 402
 403 const OSSL_PROVIDER *FIPS_get_provider(OPENSSL_CTX *ctx)
 404 {
 405     FIPS_GLOBAL *fgbl = openssl_ctx_get_data(ctx, OPENSSL_CTX_FIPS_PROV_INDEX,
 406                                              &fips_prov_ossl_ctx_method);
 407
 408     if (fgbl == NULL)
 409         return NULL;
 410
 411     return fgbl->prov;
 412 }