providers/implementations/keymgmt/rsa_kmgmt.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 /*
  11  * RSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/core_numbers.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/bn.h>
  19 #include <openssl/err.h>
  20 #include <openssl/rsa.h>
  21 #include <openssl/evp.h>
  22 #include <openssl/params.h>
  23 #include <openssl/types.h>
  24 #include "internal/param_build.h"
  25 #include "prov/implementations.h"
  26 #include "prov/providercommon.h"
  27 #include "prov/provider_ctx.h"
  28 #include "crypto/rsa.h"
  29
  30 static OSSL_OP_keymgmt_new_fn rsa_newdata;
  31 static OSSL_OP_keymgmt_gen_init_fn rsa_gen_init;
  32 static OSSL_OP_keymgmt_gen_set_params_fn rsa_gen_set_params;
  33 static OSSL_OP_keymgmt_gen_settable_params_fn rsa_gen_settable_params;
  34 static OSSL_OP_keymgmt_gen_fn rsa_gen;
  35 static OSSL_OP_keymgmt_gen_cleanup_fn rsa_gen_cleanup;
  36 static OSSL_OP_keymgmt_free_fn rsa_freedata;
  37 static OSSL_OP_keymgmt_get_params_fn rsa_get_params;
  38 static OSSL_OP_keymgmt_gettable_params_fn rsa_gettable_params;
  39 static OSSL_OP_keymgmt_has_fn rsa_has;
  40 static OSSL_OP_keymgmt_match_fn rsa_match;
  41 static OSSL_OP_keymgmt_validate_fn rsa_validate;
  42 static OSSL_OP_keymgmt_import_fn rsa_import;
  43 static OSSL_OP_keymgmt_import_types_fn rsa_import_types;
  44 static OSSL_OP_keymgmt_export_fn rsa_export;
  45 static OSSL_OP_keymgmt_export_types_fn rsa_export_types;
  46
  47 #define RSA_DEFAULT_MD "SHA256"
  48 #define RSA_POSSIBLE_SELECTIONS                 \
  49     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS)
  50
  51 DEFINE_STACK_OF(BIGNUM)
  52 DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
  53
  54 static int export_numbers(OSSL_PARAM_BLD *tmpl, const char *key,
  55                           STACK_OF(BIGNUM_const) *numbers)
  56 {
  57     int i, nnum;
  58
  59     if (numbers == NULL)
  60         return 0;
  61
  62     nnum = sk_BIGNUM_const_num(numbers);
  63
  64     for (i = 0; i < nnum; i++) {
  65         if (!ossl_param_bld_push_BN(tmpl, key,
  66                                     sk_BIGNUM_const_value(numbers, i)))
  67             return 0;
  68     }
  69
  70     return 1;
  71 }
  72
  73 static int key_to_params(RSA *rsa, OSSL_PARAM_BLD *tmpl)
  74 {
  75     int ret = 0;
  76     const BIGNUM *rsa_d = NULL, *rsa_n = NULL, *rsa_e = NULL;
  77     STACK_OF(BIGNUM_const) *factors = sk_BIGNUM_const_new_null();
  78     STACK_OF(BIGNUM_const) *exps = sk_BIGNUM_const_new_null();
  79     STACK_OF(BIGNUM_const) *coeffs = sk_BIGNUM_const_new_null();
  80
  81     if (rsa == NULL || factors == NULL || exps == NULL || coeffs == NULL)
  82         goto err;
  83
  84     RSA_get0_key(rsa, &rsa_n, &rsa_e, &rsa_d);
  85     rsa_get0_all_params(rsa, factors, exps, coeffs);
  86
  87     if (rsa_n != NULL
  88         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_N, rsa_n))
  89         goto err;
  90     if (rsa_e != NULL
  91         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_E, rsa_e))
  92         goto err;
  93     if (rsa_d != NULL
  94         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_RSA_D, rsa_d))
  95         goto err;
  96
  97     if (!export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_FACTOR, factors)
  98         || !export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_EXPONENT, exps)
  99         || !export_numbers(tmpl, OSSL_PKEY_PARAM_RSA_COEFFICIENT, coeffs))
 100         goto err;
 101
 102     ret = 1;
 103  err:
 104     sk_BIGNUM_const_free(factors);
 105     sk_BIGNUM_const_free(exps);
 106     sk_BIGNUM_const_free(coeffs);
 107     return ret;
 108 }
 109
 110 static void *rsa_newdata(void *provctx)
 111 {
 112     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 113
 114     return rsa_new_with_ctx(libctx);
 115 }
 116
 117 static void rsa_freedata(void *keydata)
 118 {
 119     RSA_free(keydata);
 120 }
 121
 122 static int rsa_has(void *keydata, int selection)
 123 {
 124     RSA *rsa = keydata;
 125     int ok = 0;
 126
 127     if (rsa != NULL) {
 128         if ((selection & RSA_POSSIBLE_SELECTIONS) != 0)
 129             ok = 1;
 130
 131         if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 132             ok = ok && 0;     /* This will change with PSS and OAEP */
 133         if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 134             ok = ok && (RSA_get0_e(rsa) != NULL);
 135         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 136             ok = ok && (RSA_get0_n(rsa) != NULL);
 137         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 138             ok = ok && (RSA_get0_d(rsa) != NULL);
 139     }
 140     return ok;
 141 }
 142
 143 static int rsa_match(const void *keydata1, const void *keydata2, int selection)
 144 {
 145     const RSA *rsa1 = keydata1;
 146     const RSA *rsa2 = keydata2;
 147     int ok = 1;
 148
 149     /* There is always an |e| */
 150     ok = ok && BN_cmp(RSA_get0_e(rsa1), RSA_get0_e(rsa2)) == 0;
 151     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 152         ok = ok && BN_cmp(RSA_get0_n(rsa1), RSA_get0_n(rsa2)) == 0;
 153     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 154         ok = ok && BN_cmp(RSA_get0_d(rsa1), RSA_get0_d(rsa2)) == 0;
 155     return ok;
 156 }
 157
 158 static int rsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 159 {
 160     RSA *rsa = keydata;
 161     int ok = 1;
 162
 163     if (rsa == NULL)
 164         return 0;
 165
 166     /* TODO(3.0) PSS and OAEP should bring on parameters */
 167
 168     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 169         ok = ok && rsa_fromdata(rsa, params);
 170
 171     return ok;
 172 }
 173
 174 static int rsa_export(void *keydata, int selection,
 175                       OSSL_CALLBACK *param_callback, void *cbarg)
 176 {
 177     RSA *rsa = keydata;
 178     OSSL_PARAM_BLD tmpl;
 179     OSSL_PARAM *params = NULL;
 180     int ok = 1;
 181
 182     if (rsa == NULL)
 183         return 0;
 184
 185     /* TODO(3.0) PSS and OAEP should bring on parameters */
 186
 187     ossl_param_bld_init(&tmpl);
 188
 189     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 190         ok = ok && key_to_params(rsa, &tmpl);
 191
 192     if (!ok
 193         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 194         return 0;
 195
 196     ok = param_callback(params, cbarg);
 197     ossl_param_bld_free(params);
 198     return ok;
 199 }
 200
 201 /*
 202  * This provider can export everything in an RSA key, so we use the exact
 203  * same type description for export as for import.  Other providers might
 204  * choose to import full keys, but only export the public parts, and will
 205  * therefore have the importkey_types and importkey_types functions return
 206  * different arrays.
 207  */
 208 static const OSSL_PARAM rsa_key_types[] = {
 209     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_N, NULL, 0),
 210     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0),
 211     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_D, NULL, 0),
 212     /* We tolerate up to 10 factors... */
 213     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 214     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 215     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 216     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 217     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 218     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 219     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 220     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 221     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 222     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_FACTOR, NULL, 0),
 223     /* ..., up to 10 CRT exponents... */
 224     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 225     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 226     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 227     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 228     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 229     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 230     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 231     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 232     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 233     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_EXPONENT, NULL, 0),
 234     /* ..., and up to 9 CRT coefficients */
 235     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 236     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 237     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 238     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 239     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 240     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 241     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 242     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 243     OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_COEFFICIENT, NULL, 0),
 244 };
 245 /*
 246  * We lied about the amount of factors, exponents and coefficients, the
 247  * export and import functions can really deal with an infinite amount
 248  * of these numbers.  However, RSA keys with too many primes are futile,
 249  * so we at least pretend to have some limits.
 250  */
 251
 252 static const OSSL_PARAM *rsa_imexport_types(int selection)
 253 {
 254     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 255         return rsa_key_types;
 256     return NULL;
 257 }
 258
 259 static const OSSL_PARAM *rsa_import_types(int selection)
 260 {
 261     return rsa_imexport_types(selection);
 262 }
 263
 264
 265 static const OSSL_PARAM *rsa_export_types(int selection)
 266 {
 267     return rsa_imexport_types(selection);
 268 }
 269
 270 static int rsa_get_params(void *key, OSSL_PARAM params[])
 271 {
 272     RSA *rsa = key;
 273     OSSL_PARAM *p;
 274
 275     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 276         && !OSSL_PARAM_set_int(p, RSA_bits(rsa)))
 277         return 0;
 278     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 279         && !OSSL_PARAM_set_int(p, RSA_security_bits(rsa)))
 280         return 0;
 281     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 282         && !OSSL_PARAM_set_int(p, RSA_size(rsa)))
 283         return 0;
 284
 285 # if 0  /* TODO(3.0): PSS support pending */
 286     if ((p = OSSL_PARAM_locate(params,
 287                                OSSL_PKEY_PARAM_MANDATORY_DIGEST)) != NULL
 288         && RSA_get0_pss_params(rsa) != NULL) {
 289         const EVP_MD *md, *mgf1md;
 290         int min_saltlen;
 291
 292         if (!rsa_pss_get_param(RSA_get0_pss_params(rsa),
 293                                &md, &mgf1md, &min_saltlen)) {
 294             ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
 295             return 0;
 296         }
 297         if (!OSSL_PARAM_set_utf8_string(p, EVP_MD_name(md)))
 298             return 0;
 299     }
 300 #endif
 301     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 302 /* TODO(3.0): PSS support pending */
 303 #if 0
 304             && RSA_get0_pss_params(rsa) == NULL
 305 #endif
 306             ) {
 307         if (!OSSL_PARAM_set_utf8_string(p, RSA_DEFAULT_MD))
 308             return 0;
 309     }
 310
 311     return 1;
 312 }
 313
 314 static const OSSL_PARAM rsa_params[] = {
 315     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 316     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 317     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 318     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 319     OSSL_PARAM_END
 320 };
 321
 322 static const OSSL_PARAM *rsa_gettable_params(void)
 323 {
 324     return rsa_params;
 325 }
 326
 327 static int rsa_validate(void *keydata, int selection)
 328 {
 329     RSA *rsa = keydata;
 330     int ok = 0;
 331
 332     if ((selection & RSA_POSSIBLE_SELECTIONS) != 0)
 333         ok = 1;
 334
 335     /* If the whole key is selected, we do a pairwise validation */
 336     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 337         == OSSL_KEYMGMT_SELECT_KEYPAIR) {
 338         ok = ok && rsa_validate_pairwise(rsa);
 339     } else {
 340         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 341             ok = ok && rsa_validate_private(rsa);
 342         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 343             ok = ok && rsa_validate_public(rsa);
 344     }
 345     return ok;
 346 }
 347
 348 struct rsa_gen_ctx {
 349     OPENSSL_CTX *libctx;
 350
 351     size_t nbits;
 352     BIGNUM *pub_exp;
 353     size_t primes;
 354
 355     /* For generation callback */
 356     OSSL_CALLBACK *cb;
 357     void *cbarg;
 358 };
 359
 360 static int rsa_gencb(int p, int n, BN_GENCB *cb)
 361 {
 362     struct rsa_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 363     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 364
 365     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 366     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 367
 368     return gctx->cb(params, gctx->cbarg);
 369 }
 370
 371 static void *rsa_gen_init(void *provctx, int selection)
 372 {
 373     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 374     struct rsa_gen_ctx *gctx = NULL;
 375
 376     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
 377         return NULL;
 378
 379     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 380         gctx->libctx = libctx;
 381         if ((gctx->pub_exp = BN_new()) == NULL
 382             || !BN_set_word(gctx->pub_exp, RSA_F4)) {
 383             BN_free(gctx->pub_exp);
 384             gctx = NULL;
 385         } else {
 386             gctx->nbits = 2048;
 387             gctx->primes = RSA_DEFAULT_PRIME_NUM;
 388         }
 389     }
 390     return gctx;
 391 }
 392
 393 static int rsa_gen_set_params(void *genctx, const OSSL_PARAM params[])
 394 {
 395     struct rsa_gen_ctx *gctx = genctx;
 396     const OSSL_PARAM *p;
 397
 398     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_BITS)) != NULL
 399         && !OSSL_PARAM_get_size_t(p, &gctx->nbits))
 400         return 0;
 401     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_PRIMES)) != NULL
 402         && !OSSL_PARAM_get_size_t(p, &gctx->primes))
 403         return 0;
 404     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E)) != NULL
 405         && !OSSL_PARAM_get_BN(p, &gctx->pub_exp))
 406         return 0;
 407     return 1;
 408 }
 409
 410 static const OSSL_PARAM *rsa_gen_settable_params(void *provctx)
 411 {
 412     static OSSL_PARAM settable[] = {
 413         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_BITS, NULL),
 414         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_RSA_PRIMES, NULL),
 415         OSSL_PARAM_BN(OSSL_PKEY_PARAM_RSA_E, NULL, 0),
 416         OSSL_PARAM_END
 417     };
 418
 419     return settable;
 420 }
 421
 422 static void *rsa_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 423 {
 424     struct rsa_gen_ctx *gctx = genctx;
 425     RSA *rsa = NULL;
 426     BN_GENCB *gencb = NULL;
 427
 428     if (gctx == NULL
 429         || (rsa = rsa_new_with_ctx(gctx->libctx)) == NULL)
 430         return NULL;
 431
 432     gctx->cb = osslcb;
 433     gctx->cbarg = cbarg;
 434     gencb = BN_GENCB_new();
 435     if (gencb != NULL)
 436         BN_GENCB_set(gencb, rsa_gencb, genctx);
 437
 438     if (!RSA_generate_multi_prime_key(rsa, (int)gctx->nbits, (int)gctx->primes,
 439                                       gctx->pub_exp, gencb)) {
 440         RSA_free(rsa);
 441         rsa = NULL;
 442     }
 443
 444     BN_GENCB_free(gencb);
 445
 446     return rsa;
 447 }
 448
 449 static void rsa_gen_cleanup(void *genctx)
 450 {
 451     struct rsa_gen_ctx *gctx = genctx;
 452
 453     if (gctx == NULL)
 454         return;
 455
 456     BN_clear_free(gctx->pub_exp);
 457     OPENSSL_free(gctx);
 458 }
 459
 460 const OSSL_DISPATCH rsa_keymgmt_functions[] = {
 461     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))rsa_newdata },
 462     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))rsa_gen_init },
 463     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS,
 464       (void (*)(void))rsa_gen_set_params },
 465     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 466       (void (*)(void))rsa_gen_settable_params },
 467     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))rsa_gen },
 468     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))rsa_gen_cleanup },
 469     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))rsa_freedata },
 470     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))rsa_get_params },
 471     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))rsa_gettable_params },
 472     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))rsa_has },
 473     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))rsa_match },
 474     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))rsa_validate },
 475     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))rsa_import },
 476     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))rsa_import_types },
 477     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))rsa_export },
 478     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))rsa_export_types },
 479     { 0, NULL }
 480 };