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