crypto/encode_decode/decoder_meth.c

   1 /*
   2  * Copyright 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/decoder.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/decoder.h"
  19 #include "encoder_local.h"
  20
  21 /*
  22  * Decoder 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_DECODER *ossl_decoder_new(void)
  28 {
  29     OSSL_DECODER *decoder = NULL;
  30
  31     if ((decoder = OPENSSL_zalloc(sizeof(*decoder))) == NULL
  32         || (decoder->base.lock = CRYPTO_THREAD_lock_new()) == NULL) {
  33         OSSL_DECODER_free(decoder);
  34         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
  35         return NULL;
  36     }
  37
  38     decoder->base.refcnt = 1;
  39
  40     return decoder;
  41 }
  42
  43 int OSSL_DECODER_up_ref(OSSL_DECODER *decoder)
  44 {
  45     int ref = 0;
  46
  47     CRYPTO_UP_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
  48     return 1;
  49 }
  50
  51 void OSSL_DECODER_free(OSSL_DECODER *decoder)
  52 {
  53     int ref = 0;
  54
  55     if (decoder == NULL)
  56         return;
  57
  58     CRYPTO_DOWN_REF(&decoder->base.refcnt, &ref, decoder->base.lock);
  59     if (ref > 0)
  60         return;
  61     ossl_provider_free(decoder->base.prov);
  62     CRYPTO_THREAD_lock_free(decoder->base.lock);
  63     OPENSSL_free(decoder);
  64 }
  65
  66 /* Permanent decoder method store, constructor and destructor */
  67 static void decoder_store_free(void *vstore)
  68 {
  69     ossl_method_store_free(vstore);
  70 }
  71
  72 static void *decoder_store_new(OPENSSL_CTX *ctx)
  73 {
  74     return ossl_method_store_new(ctx);
  75 }
  76
  77
  78 static const OPENSSL_CTX_METHOD decoder_store_method = {
  79     decoder_store_new,
  80     decoder_store_free,
  81 };
  82
  83 /* Data to be passed through ossl_method_construct() */
  84 struct decoder_data_st {
  85     OPENSSL_CTX *libctx;
  86     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
  87     int id;                      /* For get_decoder_from_store() */
  88     const char *names;           /* For get_decoder_from_store() */
  89     const char *propquery;       /* For get_decoder_from_store() */
  90 };
  91
  92 /*
  93  * Generic routines to fetch / create DECODER methods with
  94  * ossl_method_construct()
  95  */
  96
  97 /* Temporary decoder method store, constructor and destructor */
  98 static void *alloc_tmp_decoder_store(OPENSSL_CTX *ctx)
  99 {
 100     return ossl_method_store_new(ctx);
 101 }
 102
 103 static void dealloc_tmp_decoder_store(void *store)
 104 {
 105     if (store != NULL)
 106         ossl_method_store_free(store);
 107 }
 108
 109 /* Get the permanent decoder store */
 110 static OSSL_METHOD_STORE *get_decoder_store(OPENSSL_CTX *libctx)
 111 {
 112     return openssl_ctx_get_data(libctx, OPENSSL_CTX_DECODER_STORE_INDEX,
 113                                 &decoder_store_method);
 114 }
 115
 116 /* Get decoder methods from a store, or put one in */
 117 static void *get_decoder_from_store(OPENSSL_CTX *libctx, void *store,
 118                                     void *data)
 119 {
 120     struct decoder_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_decoder_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_decoder_in_store(OPENSSL_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_decoder_store(libctx)) == NULL)
 152         return 0;
 153
 154     return ossl_method_store_add(store, prov, id, propdef, method,
 155                                  (int (*)(void *))OSSL_DECODER_up_ref,
 156                                  (void (*)(void *))OSSL_DECODER_free);
 157 }
 158
 159 /* Create and populate a decoder method */
 160 void *ossl_decoder_from_dispatch(int id, const OSSL_ALGORITHM *algodef,
 161                                  OSSL_PROVIDER *prov)
 162 {
 163     OSSL_DECODER *decoder = NULL;
 164     const OSSL_DISPATCH *fns = algodef->implementation;
 165
 166     if ((decoder = ossl_decoder_new()) == NULL)
 167         return NULL;
 168     decoder->base.id = id;
 169     decoder->base.propdef = algodef->property_definition;
 170
 171     for (; fns->function_id != 0; fns++) {
 172         switch (fns->function_id) {
 173         case OSSL_FUNC_DECODER_NEWCTX:
 174             if (decoder->newctx == NULL)
 175                 decoder->newctx = OSSL_FUNC_decoder_newctx(fns);
 176             break;
 177         case OSSL_FUNC_DECODER_FREECTX:
 178             if (decoder->freectx == NULL)
 179                 decoder->freectx = OSSL_FUNC_decoder_freectx(fns);
 180             break;
 181         case OSSL_FUNC_DECODER_GET_PARAMS:
 182             if (decoder->get_params == NULL)
 183                 decoder->get_params =
 184                     OSSL_FUNC_decoder_get_params(fns);
 185             break;
 186         case OSSL_FUNC_DECODER_GETTABLE_PARAMS:
 187             if (decoder->gettable_params == NULL)
 188                 decoder->gettable_params =
 189                     OSSL_FUNC_decoder_gettable_params(fns);
 190             break;
 191         case OSSL_FUNC_DECODER_SET_CTX_PARAMS:
 192             if (decoder->set_ctx_params == NULL)
 193                 decoder->set_ctx_params =
 194                     OSSL_FUNC_decoder_set_ctx_params(fns);
 195             break;
 196         case OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS:
 197             if (decoder->settable_ctx_params == NULL)
 198                 decoder->settable_ctx_params =
 199                     OSSL_FUNC_decoder_settable_ctx_params(fns);
 200             break;
 201         case OSSL_FUNC_DECODER_DECODE:
 202             if (decoder->decode == NULL)
 203                 decoder->decode = OSSL_FUNC_decoder_decode(fns);
 204             break;
 205         case OSSL_FUNC_DECODER_EXPORT_OBJECT:
 206             if (decoder->export_object == NULL)
 207                 decoder->export_object = OSSL_FUNC_decoder_export_object(fns);
 208             break;
 209         }
 210     }
 211     /*
 212      * Try to check that the method is sensible.
 213      * If you have a constructor, you must have a destructor and vice versa.
 214      * You must have at least one of the encoding driver functions.
 215      */
 216     if (!((decoder->newctx == NULL && decoder->freectx == NULL)
 217           || (decoder->newctx != NULL && decoder->freectx != NULL))
 218         || decoder->decode == NULL) {
 219         OSSL_DECODER_free(decoder);
 220         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 221         return NULL;
 222     }
 223
 224     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 225         OSSL_DECODER_free(decoder);
 226         return NULL;
 227     }
 228
 229     decoder->base.prov = prov;
 230     return decoder;
 231 }
 232
 233
 234 /*
 235  * The core fetching functionality passes the names of the implementation.
 236  * This function is responsible to getting an identity number for them,
 237  * then call ossl_decoder_from_dispatch() with that identity number.
 238  */
 239 static void *construct_decoder(const OSSL_ALGORITHM *algodef,
 240                                OSSL_PROVIDER *prov, void *unused)
 241 {
 242     /*
 243      * This function is only called if get_decoder_from_store() returned
 244      * NULL, so it's safe to say that of all the spots to create a new
 245      * namemap entry, this is it.  Should the name already exist there, we
 246      * know that ossl_namemap_add() will return its corresponding number.
 247      */
 248     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
 249     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 250     const char *names = algodef->algorithm_names;
 251     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 252     void *method = NULL;
 253
 254     if (id != 0)
 255         method = ossl_decoder_from_dispatch(id, algodef, prov);
 256
 257     return method;
 258 }
 259
 260 /* Intermediary function to avoid ugly casts, used below */
 261 static void destruct_decoder(void *method, void *data)
 262 {
 263     OSSL_DECODER_free(method);
 264 }
 265
 266 static int up_ref_decoder(void *method)
 267 {
 268     return OSSL_DECODER_up_ref(method);
 269 }
 270
 271 static void free_decoder(void *method)
 272 {
 273     OSSL_DECODER_free(method);
 274 }
 275
 276 /* Fetching support.  Can fetch by numeric identity or by name */
 277 static OSSL_DECODER *inner_ossl_decoder_fetch(OPENSSL_CTX *libctx, int id,
 278                                               const char *name,
 279                                               const char *properties)
 280 {
 281     OSSL_METHOD_STORE *store = get_decoder_store(libctx);
 282     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 283     void *method = NULL;
 284
 285     if (store == NULL || namemap == NULL)
 286         return NULL;
 287
 288     /*
 289      * If we have been passed neither a name_id or a name, we have an
 290      * internal programming error.
 291      */
 292     if (!ossl_assert(id != 0 || name != NULL))
 293         return NULL;
 294
 295     if (id == 0)
 296         id = ossl_namemap_name2num(namemap, name);
 297
 298     if (id == 0
 299         || !ossl_method_store_cache_get(store, id, properties, &method)) {
 300         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 301             alloc_tmp_decoder_store,
 302             dealloc_tmp_decoder_store,
 303             get_decoder_from_store,
 304             put_decoder_in_store,
 305             construct_decoder,
 306             destruct_decoder
 307         };
 308         struct decoder_data_st mcmdata;
 309
 310         mcmdata.libctx = libctx;
 311         mcmdata.mcm = &mcm;
 312         mcmdata.id = id;
 313         mcmdata.names = name;
 314         mcmdata.propquery = properties;
 315         if ((method = ossl_method_construct(libctx, OSSL_OP_DECODER,
 316                                             0 /* !force_cache */,
 317                                             &mcm, &mcmdata)) != NULL) {
 318             /*
 319              * If construction did create a method for us, we know that
 320              * there is a correct name_id and meth_id, since those have
 321              * already been calculated in get_decoder_from_store() and
 322              * put_decoder_in_store() above.
 323              */
 324             if (id == 0)
 325                 id = ossl_namemap_name2num(namemap, name);
 326             ossl_method_store_cache_set(store, id, properties, method,
 327                                         up_ref_decoder, free_decoder);
 328         }
 329     }
 330
 331     return method;
 332 }
 333
 334 OSSL_DECODER *OSSL_DECODER_fetch(OPENSSL_CTX *libctx, const char *name,
 335                                  const char *properties)
 336 {
 337     return inner_ossl_decoder_fetch(libctx, 0, name, properties);
 338 }
 339
 340 OSSL_DECODER *ossl_decoder_fetch_by_number(OPENSSL_CTX *libctx, int id,
 341                                            const char *properties)
 342 {
 343     return inner_ossl_decoder_fetch(libctx, id, NULL, properties);
 344 }
 345
 346 /*
 347  * Library of basic method functions
 348  */
 349
 350 const OSSL_PROVIDER *OSSL_DECODER_provider(const OSSL_DECODER *decoder)
 351 {
 352     if (!ossl_assert(decoder != NULL)) {
 353         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 354         return 0;
 355     }
 356
 357     return decoder->base.prov;
 358 }
 359
 360 const char *OSSL_DECODER_properties(const OSSL_DECODER *decoder)
 361 {
 362     if (!ossl_assert(decoder != NULL)) {
 363         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 364         return 0;
 365     }
 366
 367     return decoder->base.propdef;
 368 }
 369
 370 int OSSL_DECODER_number(const OSSL_DECODER *decoder)
 371 {
 372     if (!ossl_assert(decoder != NULL)) {
 373         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 374         return 0;
 375     }
 376
 377     return decoder->base.id;
 378 }
 379
 380 int OSSL_DECODER_is_a(const OSSL_DECODER *decoder, const char *name)
 381 {
 382     if (decoder->base.prov != NULL) {
 383         OPENSSL_CTX *libctx = ossl_provider_library_context(decoder->base.prov);
 384         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 385
 386         return ossl_namemap_name2num(namemap, name) == decoder->base.id;
 387     }
 388     return 0;
 389 }
 390
 391 struct decoder_do_all_data_st {
 392     void (*user_fn)(void *method, void *arg);
 393     void *user_arg;
 394 };
 395
 396 static void decoder_do_one(OSSL_PROVIDER *provider,
 397                            const OSSL_ALGORITHM *algodef,
 398                            int no_store, void *vdata)
 399 {
 400     struct decoder_do_all_data_st *data = vdata;
 401     OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
 402     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 403     const char *names = algodef->algorithm_names;
 404     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 405     void *method = NULL;
 406
 407     if (id != 0)
 408         method = ossl_decoder_from_dispatch(id, algodef, provider);
 409
 410     if (method != NULL) {
 411         data->user_fn(method, data->user_arg);
 412         OSSL_DECODER_free(method);
 413     }
 414 }
 415
 416 void OSSL_DECODER_do_all_provided(OPENSSL_CTX *libctx,
 417                                   void (*fn)(OSSL_DECODER *decoder, void *arg),
 418                                   void *arg)
 419 {
 420     struct decoder_do_all_data_st data;
 421
 422     data.user_fn = (void (*)(void *, void *))fn;
 423     data.user_arg = arg;
 424     ossl_algorithm_do_all(libctx, OSSL_OP_DECODER, NULL,
 425                           NULL, decoder_do_one, NULL,
 426                           &data);
 427 }
 428
 429 void OSSL_DECODER_names_do_all(const OSSL_DECODER *decoder,
 430                                void (*fn)(const char *name, void *data),
 431                                void *data)
 432 {
 433     if (decoder == NULL)
 434         return;
 435
 436     if (decoder->base.prov != NULL) {
 437         OPENSSL_CTX *libctx = ossl_provider_library_context(decoder->base.prov);
 438         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 439
 440         ossl_namemap_doall_names(namemap, decoder->base.id, fn, data);
 441     }
 442 }
 443
 444 const OSSL_PARAM *
 445 OSSL_DECODER_gettable_params(OSSL_DECODER *decoder)
 446 {
 447     if (decoder != NULL && decoder->gettable_params != NULL) {
 448         void *provctx = ossl_provider_ctx(OSSL_DECODER_provider(decoder));
 449
 450         return decoder->gettable_params(provctx);
 451     }
 452     return NULL;
 453 }
 454
 455 int OSSL_DECODER_get_params(OSSL_DECODER *decoder, OSSL_PARAM params[])
 456 {
 457     if (decoder != NULL && decoder->get_params != NULL)
 458         return decoder->get_params(params);
 459     return 0;
 460 }
 461
 462 const OSSL_PARAM *
 463 OSSL_DECODER_settable_ctx_params(OSSL_DECODER *decoder)
 464 {
 465     if (decoder != NULL && decoder->settable_ctx_params != NULL) {
 466         void *provctx = ossl_provider_ctx(OSSL_DECODER_provider(decoder));
 467
 468         return decoder->settable_ctx_params(provctx);
 469     }
 470     return NULL;
 471 }
 472
 473 /*
 474  * Decoder context support
 475  */
 476
 477 /*
 478  * |encoder| value NULL is valid, and signifies that there is no decoder.
 479  * This is useful to provide fallback mechanisms.
 480  *  Functions that want to verify if there is a decoder can do so with
 481  * OSSL_DECODER_CTX_get_decoder()
 482  */
 483 OSSL_DECODER_CTX *OSSL_DECODER_CTX_new(void)
 484 {
 485     OSSL_DECODER_CTX *ctx;
 486
 487     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
 488         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
 489
 490     return ctx;
 491 }
 492
 493 int OSSL_DECODER_CTX_set_params(OSSL_DECODER_CTX *ctx,
 494                                 const OSSL_PARAM params[])
 495 {
 496     size_t i;
 497     size_t l;
 498
 499     if (!ossl_assert(ctx != NULL)) {
 500         ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_PASSED_NULL_PARAMETER);
 501         return 0;
 502     }
 503
 504     if (ctx->decoder_insts == NULL)
 505         return 1;
 506
 507     l = OSSL_DECODER_CTX_get_num_decoders(ctx);
 508     for (i = 0; i < l; i++) {
 509         OSSL_DECODER_INSTANCE *decoder_inst =
 510             sk_OSSL_DECODER_INSTANCE_value(ctx->decoder_insts, i);
 511         OSSL_DECODER *decoder =
 512             OSSL_DECODER_INSTANCE_get_decoder(decoder_inst);
 513         OSSL_DECODER *decoderctx =
 514             OSSL_DECODER_INSTANCE_get_decoder_ctx(decoder_inst);
 515
 516         if (decoderctx == NULL || decoder->set_ctx_params == NULL)
 517             continue;
 518         if (!decoder->set_ctx_params(decoderctx, params))
 519             return 0;
 520     }
 521     return 1;
 522 }
 523
 524 void OSSL_DECODER_CTX_free(OSSL_DECODER_CTX *ctx)
 525 {
 526     if (ctx != NULL) {
 527         if (ctx->cleanup != NULL)
 528             ctx->cleanup(ctx->construct_data);
 529         sk_OSSL_DECODER_INSTANCE_pop_free(ctx->decoder_insts,
 530                                           ossl_decoder_instance_free);
 531         ossl_pw_clear_passphrase_data(&ctx->pwdata);
 532         OPENSSL_free(ctx);
 533     }
 534 }