crypto/encode_decode/encoder_meth.c

   1 /*
   2  * Copyright 2019-2020 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 <openssl/core.h>
  11 #include <openssl/core_dispatch.h>
  12 #include <openssl/encoder.h>
  13 #include <openssl/ui.h>
  14 #include "internal/core.h"
  15 #include "internal/namemap.h"
  16 #include "internal/property.h"
  17 #include "internal/provider.h"
  18 #include "crypto/encoder.h"
  19 #include "encoder_local.h"
  20
  21 /*
  22  * Encoder can have multiple names, separated with colons in a name string
  23  */
  24 #define NAME_SEPARATOR ':'
  25
  26 /* Simple method structure constructor and destructor */
  27 static OSSL_ENCODER *ossl_encoder_new(void)
  28 {
  29     OSSL_ENCODER *encoder = NULL;
  30
  31     if ((encoder = OPENSSL_zalloc(sizeof(*encoder))) == NULL
  32         || (encoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
  33         OSSL_ENCODER_free(encoder);
  34         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
  35         return NULL;
  36     }
  37
  38     encoder->base.refcnt = 1;
  39
  40     return encoder;
  41 }
  42
  43 int OSSL_ENCODER_up_ref(OSSL_ENCODER *encoder)
  44 {
  45     int ref = 0;
  46
  47     CRYPTO_UP_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
  48     return 1;
  49 }
  50
  51 void OSSL_ENCODER_free(OSSL_ENCODER *encoder)
  52 {
  53     int ref = 0;
  54
  55     if (encoder == NULL)
  56         return;
  57
  58     CRYPTO_DOWN_REF(&encoder->base.refcnt, &ref, encoder->base.lock);
  59     if (ref > 0)
  60         return;
  61     ossl_provider_free(encoder->base.prov);
  62     CRYPTO_THREAD_lock_free(encoder->base.lock);
  63     OPENSSL_free(encoder);
  64 }
  65
  66 /* Permanent encoder method store, constructor and destructor */
  67 static void encoder_store_free(void *vstore)
  68 {
  69     ossl_method_store_free(vstore);
  70 }
  71
  72 static void *encoder_store_new(OSSL_LIB_CTX *ctx)
  73 {
  74     return ossl_method_store_new(ctx);
  75 }
  76
  77
  78 static const OSSL_LIB_CTX_METHOD encoder_store_method = {
  79     encoder_store_new,
  80     encoder_store_free,
  81 };
  82
  83 /* Data to be passed through ossl_method_construct() */
  84 struct encoder_data_st {
  85     OSSL_LIB_CTX *libctx;
  86     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
  87     int id;                      /* For get_encoder_from_store() */
  88     const char *names;           /* For get_encoder_from_store() */
  89     const char *propquery;       /* For get_encoder_from_store() */
  90 };
  91
  92 /*
  93  * Generic routines to fetch / create ENCODER methods with
  94  * ossl_method_construct()
  95  */
  96
  97 /* Temporary encoder method store, constructor and destructor */
  98 static void *alloc_tmp_encoder_store(OSSL_LIB_CTX *ctx)
  99 {
 100     return ossl_method_store_new(ctx);
 101 }
 102
 103 static void dealloc_tmp_encoder_store(void *store)
 104 {
 105     if (store != NULL)
 106         ossl_method_store_free(store);
 107 }
 108
 109 /* Get the permanent encoder store */
 110 static OSSL_METHOD_STORE *get_encoder_store(OSSL_LIB_CTX *libctx)
 111 {
 112     return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_ENCODER_STORE_INDEX,
 113                                  &encoder_store_method);
 114 }
 115
 116 /* Get encoder methods from a store, or put one in */
 117 static void *get_encoder_from_store(OSSL_LIB_CTX *libctx, void *store,
 118                                     void *data)
 119 {
 120     struct encoder_data_st *methdata = data;
 121     void *method = NULL;
 122     int id;
 123
 124     if ((id = methdata->id) == 0) {
 125         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 126
 127         id = ossl_namemap_name2num(namemap, methdata->names);
 128     }
 129
 130     if (store == NULL
 131         && (store = get_encoder_store(libctx)) == NULL)
 132         return NULL;
 133
 134     if (!ossl_method_store_fetch(store, id, methdata->propquery, &method))
 135         return NULL;
 136     return method;
 137 }
 138
 139 static int put_encoder_in_store(OSSL_LIB_CTX *libctx, void *store,
 140                                 void *method, const OSSL_PROVIDER *prov,
 141                                 int operation_id, const char *names,
 142                                 const char *propdef, void *unused)
 143 {
 144     OSSL_NAMEMAP *namemap;
 145     int id;
 146
 147     if ((namemap = ossl_namemap_stored(libctx)) == NULL
 148         || (id = ossl_namemap_name2num(namemap, names)) == 0)
 149         return 0;
 150
 151     if (store == NULL && (store = get_encoder_store(libctx)) == NULL)
 152         return 0;
 153
 154     return ossl_method_store_add(store, prov, id, propdef, method,
 155                                  (int (*)(void *))OSSL_ENCODER_up_ref,
 156                                  (void (*)(void *))OSSL_ENCODER_free);
 157 }
 158
 159 /* Create and populate a encoder method */
 160 static void *encoder_from_dispatch(int id, const OSSL_ALGORITHM *algodef,
 161                                    OSSL_PROVIDER *prov)
 162 {
 163     OSSL_ENCODER *encoder = NULL;
 164     const OSSL_DISPATCH *fns = algodef->implementation;
 165
 166     if ((encoder = ossl_encoder_new()) == NULL)
 167         return NULL;
 168     encoder->base.id = id;
 169     encoder->base.propdef = algodef->property_definition;
 170
 171     for (; fns->function_id != 0; fns++) {
 172         switch (fns->function_id) {
 173         case OSSL_FUNC_ENCODER_NEWCTX:
 174             if (encoder->newctx == NULL)
 175                 encoder->newctx =
 176                     OSSL_FUNC_encoder_newctx(fns);
 177             break;
 178         case OSSL_FUNC_ENCODER_FREECTX:
 179             if (encoder->freectx == NULL)
 180                 encoder->freectx =
 181                     OSSL_FUNC_encoder_freectx(fns);
 182             break;
 183         case OSSL_FUNC_ENCODER_GET_PARAMS:
 184             if (encoder->get_params == NULL)
 185                 encoder->get_params =
 186                     OSSL_FUNC_encoder_get_params(fns);
 187             break;
 188         case OSSL_FUNC_ENCODER_GETTABLE_PARAMS:
 189             if (encoder->gettable_params == NULL)
 190                 encoder->gettable_params =
 191                     OSSL_FUNC_encoder_gettable_params(fns);
 192             break;
 193         case OSSL_FUNC_ENCODER_SET_CTX_PARAMS:
 194             if (encoder->set_ctx_params == NULL)
 195                 encoder->set_ctx_params =
 196                     OSSL_FUNC_encoder_set_ctx_params(fns);
 197             break;
 198         case OSSL_FUNC_ENCODER_SETTABLE_CTX_PARAMS:
 199             if (encoder->settable_ctx_params == NULL)
 200                 encoder->settable_ctx_params =
 201                     OSSL_FUNC_encoder_settable_ctx_params(fns);
 202             break;
 203         case OSSL_FUNC_ENCODER_ENCODE:
 204             if (encoder->encode == NULL)
 205                 encoder->encode = OSSL_FUNC_encoder_encode(fns);
 206             break;
 207         case OSSL_FUNC_ENCODER_IMPORT_OBJECT:
 208             if (encoder->import_object == NULL)
 209                 encoder->import_object =
 210                     OSSL_FUNC_encoder_import_object(fns);
 211             break;
 212         case OSSL_FUNC_ENCODER_FREE_OBJECT:
 213             if (encoder->free_object == NULL)
 214                 encoder->free_object =
 215                     OSSL_FUNC_encoder_free_object(fns);
 216             break;
 217         }
 218     }
 219     /*
 220      * Try to check that the method is sensible.
 221      * If you have a constructor, you must have a destructor and vice versa.
 222      * You must have the encoding driver functions.
 223      */
 224     if (!((encoder->newctx == NULL && encoder->freectx == NULL)
 225           || (encoder->newctx != NULL && encoder->freectx != NULL)
 226           || (encoder->import_object != NULL && encoder->free_object != NULL)
 227           || (encoder->import_object == NULL && encoder->free_object == NULL))
 228         || encoder->encode == NULL
 229         || encoder->gettable_params == NULL
 230         || encoder->get_params == NULL) {
 231         OSSL_ENCODER_free(encoder);
 232         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 233         return NULL;
 234     }
 235
 236     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 237         OSSL_ENCODER_free(encoder);
 238         return NULL;
 239     }
 240
 241     encoder->base.prov = prov;
 242     return encoder;
 243 }
 244
 245
 246 /*
 247  * The core fetching functionality passes the names of the implementation.
 248  * This function is responsible to getting an identity number for them,
 249  * then call encoder_from_dispatch() with that identity number.
 250  */
 251 static void *construct_encoder(const OSSL_ALGORITHM *algodef,
 252                                OSSL_PROVIDER *prov, void *unused)
 253 {
 254     /*
 255      * This function is only called if get_encoder_from_store() returned
 256      * NULL, so it's safe to say that of all the spots to create a new
 257      * namemap entry, this is it.  Should the name already exist there, we
 258      * know that ossl_namemap_add() will return its corresponding number.
 259      */
 260     OSSL_LIB_CTX *libctx = ossl_provider_library_context(prov);
 261     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 262     const char *names = algodef->algorithm_names;
 263     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 264     void *method = NULL;
 265
 266     if (id != 0)
 267         method = encoder_from_dispatch(id, algodef, prov);
 268
 269     return method;
 270 }
 271
 272 /* Intermediary function to avoid ugly casts, used below */
 273 static void destruct_encoder(void *method, void *data)
 274 {
 275     OSSL_ENCODER_free(method);
 276 }
 277
 278 static int up_ref_encoder(void *method)
 279 {
 280     return OSSL_ENCODER_up_ref(method);
 281 }
 282
 283 static void free_encoder(void *method)
 284 {
 285     OSSL_ENCODER_free(method);
 286 }
 287
 288 /* Fetching support.  Can fetch by numeric identity or by name */
 289 static OSSL_ENCODER *inner_ossl_encoder_fetch(OSSL_LIB_CTX *libctx,
 290                                               int id, const char *name,
 291                                               const char *properties)
 292 {
 293     OSSL_METHOD_STORE *store = get_encoder_store(libctx);
 294     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 295     void *method = NULL;
 296
 297     if (store == NULL || namemap == NULL)
 298         return NULL;
 299
 300     /*
 301      * If we have been passed neither a name_id or a name, we have an
 302      * internal programming error.
 303      */
 304     if (!ossl_assert(id != 0 || name != NULL))
 305         return NULL;
 306
 307     if (id == 0)
 308         id = ossl_namemap_name2num(namemap, name);
 309
 310     if (id == 0
 311         || !ossl_method_store_cache_get(store, id, properties, &method)) {
 312         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 313             alloc_tmp_encoder_store,
 314             dealloc_tmp_encoder_store,
 315             get_encoder_from_store,
 316             put_encoder_in_store,
 317             construct_encoder,
 318             destruct_encoder
 319         };
 320         struct encoder_data_st mcmdata;
 321
 322         mcmdata.libctx = libctx;
 323         mcmdata.mcm = &mcm;
 324         mcmdata.id = id;
 325         mcmdata.names = name;
 326         mcmdata.propquery = properties;
 327         if ((method = ossl_method_construct(libctx, OSSL_OP_ENCODER,
 328                                             0 /* !force_cache */,
 329                                             &mcm, &mcmdata)) != NULL) {
 330             /*
 331              * If construction did create a method for us, we know that
 332              * there is a correct name_id and meth_id, since those have
 333              * already been calculated in get_encoder_from_store() and
 334              * put_encoder_in_store() above.
 335              */
 336             if (id == 0)
 337                 id = ossl_namemap_name2num(namemap, name);
 338             ossl_method_store_cache_set(store, id, properties, method,
 339                                         up_ref_encoder, free_encoder);
 340         }
 341     }
 342
 343     return method;
 344 }
 345
 346 OSSL_ENCODER *OSSL_ENCODER_fetch(OSSL_LIB_CTX *libctx, const char *name,
 347                                  const char *properties)
 348 {
 349     return inner_ossl_encoder_fetch(libctx, 0, name, properties);
 350 }
 351
 352 OSSL_ENCODER *ossl_encoder_fetch_by_number(OSSL_LIB_CTX *libctx, int id,
 353                                            const char *properties)
 354 {
 355     return inner_ossl_encoder_fetch(libctx, id, NULL, properties);
 356 }
 357
 358 /*
 359  * Library of basic method functions
 360  */
 361
 362 const OSSL_PROVIDER *OSSL_ENCODER_provider(const OSSL_ENCODER *encoder)
 363 {
 364     if (!ossl_assert(encoder != NULL)) {
 365         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 366         return 0;
 367     }
 368
 369     return encoder->base.prov;
 370 }
 371
 372 const char *OSSL_ENCODER_properties(const OSSL_ENCODER *encoder)
 373 {
 374     if (!ossl_assert(encoder != NULL)) {
 375         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 376         return 0;
 377     }
 378
 379     return encoder->base.propdef;
 380 }
 381
 382 int OSSL_ENCODER_number(const OSSL_ENCODER *encoder)
 383 {
 384     if (!ossl_assert(encoder != NULL)) {
 385         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 386         return 0;
 387     }
 388
 389     return encoder->base.id;
 390 }
 391
 392 int OSSL_ENCODER_is_a(const OSSL_ENCODER *encoder, const char *name)
 393 {
 394     if (encoder->base.prov != NULL) {
 395         OSSL_LIB_CTX *libctx = ossl_provider_library_context(encoder->base.prov);
 396         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 397
 398         return ossl_namemap_name2num(namemap, name) == encoder->base.id;
 399     }
 400     return 0;
 401 }
 402
 403 struct encoder_do_all_data_st {
 404     void (*user_fn)(void *method, void *arg);
 405     void *user_arg;
 406 };
 407
 408 static void encoder_do_one(OSSL_PROVIDER *provider,
 409                            const OSSL_ALGORITHM *algodef,
 410                            int no_store, void *vdata)
 411 {
 412     struct encoder_do_all_data_st *data = vdata;
 413     OSSL_LIB_CTX *libctx = ossl_provider_library_context(provider);
 414     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 415     const char *names = algodef->algorithm_names;
 416     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 417     void *method = NULL;
 418
 419     if (id != 0)
 420         method =
 421             encoder_from_dispatch(id, algodef, provider);
 422
 423     if (method != NULL) {
 424         data->user_fn(method, data->user_arg);
 425         OSSL_ENCODER_free(method);
 426     }
 427 }
 428
 429 void OSSL_ENCODER_do_all_provided(OSSL_LIB_CTX *libctx,
 430                                   void (*fn)(OSSL_ENCODER *encoder, void *arg),
 431                                   void *arg)
 432 {
 433     struct encoder_do_all_data_st data;
 434
 435     data.user_fn = (void (*)(void *, void *))fn;
 436     data.user_arg = arg;
 437
 438     /*
 439      * No pre- or post-condition for this call, as this only creates methods
 440      * temporarly and then promptly destroys them.
 441      */
 442     ossl_algorithm_do_all(libctx, OSSL_OP_ENCODER, NULL, NULL,
 443                           encoder_do_one, NULL, &data);
 444 }
 445
 446 void OSSL_ENCODER_names_do_all(const OSSL_ENCODER *encoder,
 447                                void (*fn)(const char *name, void *data),
 448                                void *data)
 449 {
 450     if (encoder == NULL)
 451         return;
 452
 453     if (encoder->base.prov != NULL) {
 454         OSSL_LIB_CTX *libctx = ossl_provider_library_context(encoder->base.prov);
 455         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 456
 457         ossl_namemap_doall_names(namemap, encoder->base.id, fn, data);
 458     }
 459 }
 460
 461 const OSSL_PARAM *
 462 OSSL_ENCODER_gettable_params(OSSL_ENCODER *encoder)
 463 {
 464     if (encoder != NULL && encoder->gettable_params != NULL) {
 465         void *provctx = ossl_provider_ctx(OSSL_ENCODER_provider(encoder));
 466
 467         return encoder->gettable_params(provctx);
 468     }
 469     return NULL;
 470 }
 471
 472 int OSSL_ENCODER_get_params(OSSL_ENCODER *encoder, OSSL_PARAM params[])
 473 {
 474     if (encoder != NULL && encoder->get_params != NULL)
 475         return encoder->get_params(params);
 476     return 0;
 477 }
 478
 479 const OSSL_PARAM *OSSL_ENCODER_settable_ctx_params(OSSL_ENCODER *encoder)
 480 {
 481     if (encoder != NULL && encoder->settable_ctx_params != NULL) {
 482         void *provctx = ossl_provider_ctx(OSSL_ENCODER_provider(encoder));
 483
 484         return encoder->settable_ctx_params(provctx);
 485     }
 486     return NULL;
 487 }
 488
 489 /*
 490  * Encoder context support
 491  */
 492
 493 OSSL_ENCODER_CTX *OSSL_ENCODER_CTX_new(void)
 494 {
 495     OSSL_ENCODER_CTX *ctx;
 496
 497     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
 498         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_MALLOC_FAILURE);
 499
 500     return ctx;
 501 }
 502
 503 int OSSL_ENCODER_CTX_set_params(OSSL_ENCODER_CTX *ctx,
 504                                 const OSSL_PARAM params[])
 505 {
 506     size_t i;
 507     size_t l;
 508
 509     if (!ossl_assert(ctx != NULL)) {
 510         ERR_raise(ERR_LIB_OSSL_ENCODER, ERR_R_PASSED_NULL_PARAMETER);
 511         return 0;
 512     }
 513
 514     if (ctx->encoder_insts == NULL)
 515         return 1;
 516
 517     l = OSSL_ENCODER_CTX_get_num_encoders(ctx);
 518     for (i = 0; i < l; i++) {
 519         OSSL_ENCODER_INSTANCE *encoder_inst =
 520             sk_OSSL_ENCODER_INSTANCE_value(ctx->encoder_insts, i);
 521         OSSL_ENCODER *encoder = OSSL_ENCODER_INSTANCE_get_encoder(encoder_inst);
 522         void *encoderctx = OSSL_ENCODER_INSTANCE_get_encoder_ctx(encoder_inst);
 523
 524         if (encoderctx == NULL || encoder->set_ctx_params == NULL)
 525             continue;
 526         if (!encoder->set_ctx_params(encoderctx, params))
 527             return 0;
 528     }
 529     return 1;
 530 }
 531
 532 void OSSL_ENCODER_CTX_free(OSSL_ENCODER_CTX *ctx)
 533 {
 534     if (ctx != NULL) {
 535         sk_OSSL_ENCODER_INSTANCE_pop_free(ctx->encoder_insts,
 536                                           ossl_encoder_instance_free);
 537         OPENSSL_free(ctx->construct_data);
 538         ossl_pw_clear_passphrase_data(&ctx->pwdata);
 539         OPENSSL_free(ctx);
 540     }
 541 }