crypto/serializer/serializer_meth.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 <openssl/core.h>
  11 #include <openssl/core_numbers.h>
  12 #include <openssl/serializer.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/serializer.h"
  19 #include "serializer_local.h"
  20
  21 /*
  22  * Serializer 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_SERIALIZER *ossl_serializer_new(void)
  28 {
  29     OSSL_SERIALIZER *ser = NULL;
  30
  31     if ((ser = OPENSSL_zalloc(sizeof(*ser))) == NULL
  32         || (ser->lock = CRYPTO_THREAD_lock_new()) == NULL) {
  33         OSSL_SERIALIZER_free(ser);
  34         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_MALLOC_FAILURE);
  35         return NULL;
  36     }
  37
  38     ser->refcnt = 1;
  39
  40     return ser;
  41 }
  42
  43 int OSSL_SERIALIZER_up_ref(OSSL_SERIALIZER *ser)
  44 {
  45     int ref = 0;
  46
  47     CRYPTO_UP_REF(&ser->refcnt, &ref, ser->lock);
  48     return 1;
  49 }
  50
  51 void OSSL_SERIALIZER_free(OSSL_SERIALIZER *ser)
  52 {
  53     int ref = 0;
  54
  55     if (ser == NULL)
  56         return;
  57
  58     CRYPTO_DOWN_REF(&ser->refcnt, &ref, ser->lock);
  59     if (ref > 0)
  60         return;
  61     ossl_provider_free(ser->prov);
  62     CRYPTO_THREAD_lock_free(ser->lock);
  63     OPENSSL_free(ser);
  64 }
  65
  66 /* Permanent serializer method store, constructor and destructor */
  67 static void serializer_store_free(void *vstore)
  68 {
  69     ossl_method_store_free(vstore);
  70 }
  71
  72 static void *serializer_store_new(OPENSSL_CTX *ctx)
  73 {
  74     return ossl_method_store_new(ctx);
  75 }
  76
  77
  78 static const OPENSSL_CTX_METHOD serializer_store_method = {
  79     serializer_store_new,
  80     serializer_store_free,
  81 };
  82
  83 /* Data to be passed through ossl_method_construct() */
  84 struct serializer_data_st {
  85     OPENSSL_CTX *libctx;
  86     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
  87     int id;                      /* For get_serializer_from_store() */
  88     const char *names;           /* For get_serializer_from_store() */
  89     const char *propquery;       /* For get_serializer_from_store() */
  90 };
  91
  92 /*
  93  * Generic routines to fetch / create SERIALIZER methods with
  94  * ossl_method_construct()
  95  */
  96
  97 /* Temporary serializer method store, constructor and destructor */
  98 static void *alloc_tmp_serializer_store(OPENSSL_CTX *ctx)
  99 {
 100     return ossl_method_store_new(ctx);
 101 }
 102
 103  static void dealloc_tmp_serializer_store(void *store)
 104 {
 105     if (store != NULL)
 106         ossl_method_store_free(store);
 107 }
 108
 109 /* Get the permanent serializer store */
 110 static OSSL_METHOD_STORE *get_serializer_store(OPENSSL_CTX *libctx)
 111 {
 112     return openssl_ctx_get_data(libctx, OPENSSL_CTX_SERIALIZER_STORE_INDEX,
 113                                 &serializer_store_method);
 114 }
 115
 116 /* Get serializer methods from a store, or put one in */
 117 static void *get_serializer_from_store(OPENSSL_CTX *libctx, void *store,
 118                                        void *data)
 119 {
 120     struct serializer_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_serializer_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_serializer_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_serializer_store(libctx)) == NULL)
 152         return 0;
 153
 154     return ossl_method_store_add(store, prov, id, propdef, method,
 155                                  (int (*)(void *))OSSL_SERIALIZER_up_ref,
 156                                  (void (*)(void *))OSSL_SERIALIZER_free);
 157 }
 158
 159 /* Create and populate a serializer method */
 160 static void *serializer_from_dispatch(int id, const OSSL_ALGORITHM *algodef,
 161                                       OSSL_PROVIDER *prov)
 162 {
 163     OSSL_SERIALIZER *ser = NULL;
 164     const OSSL_DISPATCH *fns = algodef->implementation;
 165
 166     if ((ser = ossl_serializer_new()) == NULL)
 167         return NULL;
 168     ser->id = id;
 169     ser->propdef = algodef->property_definition;
 170
 171     for (; fns->function_id != 0; fns++) {
 172         switch (fns->function_id) {
 173         case OSSL_FUNC_SERIALIZER_NEWCTX:
 174             if (ser->newctx == NULL)
 175                 ser->newctx =
 176                     OSSL_get_OP_serializer_newctx(fns);
 177             break;
 178         case OSSL_FUNC_SERIALIZER_FREECTX:
 179             if (ser->freectx == NULL)
 180                 ser->freectx =
 181                     OSSL_get_OP_serializer_freectx(fns);
 182             break;
 183         case OSSL_FUNC_SERIALIZER_SET_CTX_PARAMS:
 184             if (ser->set_ctx_params == NULL)
 185                 ser->set_ctx_params =
 186                     OSSL_get_OP_serializer_set_ctx_params(fns);
 187             break;
 188         case OSSL_FUNC_SERIALIZER_SETTABLE_CTX_PARAMS:
 189             if (ser->settable_ctx_params == NULL)
 190                 ser->settable_ctx_params =
 191                     OSSL_get_OP_serializer_settable_ctx_params(fns);
 192             break;
 193         case OSSL_FUNC_SERIALIZER_SERIALIZE_DATA:
 194             if (ser->serialize_data == NULL)
 195                 ser->serialize_data =
 196                     OSSL_get_OP_serializer_serialize_data(fns);
 197             break;
 198         case OSSL_FUNC_SERIALIZER_SERIALIZE_OBJECT:
 199             if (ser->serialize_object == NULL)
 200                 ser->serialize_object =
 201                     OSSL_get_OP_serializer_serialize_object(fns);
 202             break;
 203         }
 204     }
 205     /*
 206      * Try to check that the method is sensible.
 207      * If you have a constructor, you must have a destructor and vice versa.
 208      * You must have at least one of the serializing driver functions.
 209      */
 210     if (!((ser->newctx == NULL && ser->freectx == NULL)
 211           || (ser->newctx != NULL && ser->freectx != NULL))
 212         || (ser->serialize_data == NULL && ser->serialize_object == NULL)) {
 213         OSSL_SERIALIZER_free(ser);
 214         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_INVALID_PROVIDER_FUNCTIONS);
 215         return NULL;
 216     }
 217
 218     if (prov != NULL && !ossl_provider_up_ref(prov)) {
 219         OSSL_SERIALIZER_free(ser);
 220         return NULL;
 221     }
 222
 223     ser->prov = prov;
 224     return ser;
 225 }
 226
 227
 228 /*
 229  * The core fetching functionality passes the names of the implementation.
 230  * This function is responsible to getting an identity number for them,
 231  * then call serializer_from_dispatch() with that identity number.
 232  */
 233 static void *construct_serializer(const OSSL_ALGORITHM *algodef,
 234                                   OSSL_PROVIDER *prov, void *unused)
 235 {
 236     /*
 237      * This function is only called if get_serializer_from_store() returned
 238      * NULL, so it's safe to say that of all the spots to create a new
 239      * namemap entry, this is it.  Should the name already exist there, we
 240      * know that ossl_namemap_add() will return its corresponding number.
 241      */
 242     OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
 243     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 244     const char *names = algodef->algorithm_names;
 245     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 246     void *method = NULL;
 247
 248     if (id != 0)
 249         method = serializer_from_dispatch(id, algodef, prov);
 250
 251     return method;
 252 }
 253
 254 /* Intermediary function to avoid ugly casts, used below */
 255 static void destruct_serializer(void *method, void *data)
 256 {
 257     OSSL_SERIALIZER_free(method);
 258 }
 259
 260 static int up_ref_serializer(void *method)
 261 {
 262     return OSSL_SERIALIZER_up_ref(method);
 263 }
 264
 265 static void free_serializer(void *method)
 266 {
 267     OSSL_SERIALIZER_free(method);
 268 }
 269
 270 /* Fetching support.  Can fetch by numeric identity or by name */
 271 static OSSL_SERIALIZER *inner_ossl_serializer_fetch(OPENSSL_CTX *libctx,
 272                                                     int id, const char *name,
 273                                                     const char *properties)
 274 {
 275     OSSL_METHOD_STORE *store = get_serializer_store(libctx);
 276     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 277     void *method = NULL;
 278
 279     if (store == NULL || namemap == NULL)
 280         return NULL;
 281
 282     /*
 283      * If we have been passed neither a name_id or a name, we have an
 284      * internal programming error.
 285      */
 286     if (!ossl_assert(id != 0 || name != NULL))
 287         return NULL;
 288
 289     if (id == 0)
 290         id = ossl_namemap_name2num(namemap, name);
 291
 292     if (id == 0
 293         || !ossl_method_store_cache_get(store, id, properties, &method)) {
 294         OSSL_METHOD_CONSTRUCT_METHOD mcm = {
 295             alloc_tmp_serializer_store,
 296             dealloc_tmp_serializer_store,
 297             get_serializer_from_store,
 298             put_serializer_in_store,
 299             construct_serializer,
 300             destruct_serializer
 301         };
 302         struct serializer_data_st mcmdata;
 303
 304         mcmdata.libctx = libctx;
 305         mcmdata.mcm = &mcm;
 306         mcmdata.id = id;
 307         mcmdata.names = name;
 308         mcmdata.propquery = properties;
 309         if ((method = ossl_method_construct(libctx, OSSL_OP_SERIALIZER,
 310                                             0 /* !force_cache */,
 311                                             &mcm, &mcmdata)) != NULL) {
 312             /*
 313              * If construction did create a method for us, we know that
 314              * there is a correct name_id and meth_id, since those have
 315              * already been calculated in get_serializer_from_store() and
 316              * put_serializer_in_store() above.
 317              */
 318             if (id == 0)
 319                 id = ossl_namemap_name2num(namemap, name);
 320             ossl_method_store_cache_set(store, id, properties, method,
 321                                         up_ref_serializer, free_serializer);
 322         }
 323     }
 324
 325     return method;
 326 }
 327
 328 OSSL_SERIALIZER *OSSL_SERIALIZER_fetch(OPENSSL_CTX *libctx, const char *name,
 329                                        const char *properties)
 330 {
 331     return inner_ossl_serializer_fetch(libctx, 0, name, properties);
 332 }
 333
 334 OSSL_SERIALIZER *ossl_serializer_fetch_by_number(OPENSSL_CTX *libctx, int id,
 335                                                  const char *properties)
 336 {
 337     return inner_ossl_serializer_fetch(libctx, id, NULL, properties);
 338 }
 339
 340 /*
 341  * Library of basic method functions
 342  */
 343
 344 const OSSL_PROVIDER *OSSL_SERIALIZER_provider(const OSSL_SERIALIZER *ser)
 345 {
 346     if (!ossl_assert(ser != NULL)) {
 347         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_PASSED_NULL_PARAMETER);
 348         return 0;
 349     }
 350
 351     return ser->prov;
 352 }
 353
 354 const char *OSSL_SERIALIZER_properties(const OSSL_SERIALIZER *ser)
 355 {
 356     if (!ossl_assert(ser != NULL)) {
 357         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_PASSED_NULL_PARAMETER);
 358         return 0;
 359     }
 360
 361     return ser->propdef;
 362 }
 363
 364 int OSSL_SERIALIZER_number(const OSSL_SERIALIZER *ser)
 365 {
 366     if (!ossl_assert(ser != NULL)) {
 367         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_PASSED_NULL_PARAMETER);
 368         return 0;
 369     }
 370
 371     return ser->id;
 372 }
 373
 374 int OSSL_SERIALIZER_is_a(const OSSL_SERIALIZER *ser, const char *name)
 375 {
 376     if (ser->prov != NULL) {
 377         OPENSSL_CTX *libctx = ossl_provider_library_context(ser->prov);
 378         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 379
 380         return ossl_namemap_name2num(namemap, name) == ser->id;
 381     }
 382     return 0;
 383 }
 384
 385 struct serializer_do_all_data_st {
 386     void (*user_fn)(void *method, void *arg);
 387     void *user_arg;
 388 };
 389
 390 static void serializer_do_one(OSSL_PROVIDER *provider,
 391                               const OSSL_ALGORITHM *algodef,
 392                               int no_store, void *vdata)
 393 {
 394     struct serializer_do_all_data_st *data = vdata;
 395     OPENSSL_CTX *libctx = ossl_provider_library_context(provider);
 396     OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 397     const char *names = algodef->algorithm_names;
 398     int id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
 399     void *method = NULL;
 400
 401     if (id != 0)
 402         method =
 403             serializer_from_dispatch(id, algodef, provider);
 404
 405     if (method != NULL) {
 406         data->user_fn(method, data->user_arg);
 407         OSSL_SERIALIZER_free(method);
 408     }
 409 }
 410
 411 void OSSL_SERIALIZER_do_all_provided(OPENSSL_CTX *libctx,
 412                                      void (*fn)(OSSL_SERIALIZER *ser,
 413                                                 void *arg),
 414                                      void *arg)
 415 {
 416     struct serializer_do_all_data_st data;
 417
 418     data.user_fn = (void (*)(void *, void *))fn;
 419     data.user_arg = arg;
 420
 421     /*
 422      * No pre- or post-condition for this call, as this only creates methods
 423      * temporarly and then promptly destroys them.
 424      */
 425     ossl_algorithm_do_all(libctx, OSSL_OP_SERIALIZER, NULL, NULL,
 426                           serializer_do_one, NULL, &data);
 427 }
 428
 429 void OSSL_SERIALIZER_names_do_all(const OSSL_SERIALIZER *ser,
 430                                   void (*fn)(const char *name, void *data),
 431                                   void *data)
 432 {
 433     if (ser == NULL)
 434         return;
 435
 436     if (ser->prov != NULL) {
 437         OPENSSL_CTX *libctx = ossl_provider_library_context(ser->prov);
 438         OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
 439
 440         ossl_namemap_doall_names(namemap, ser->id, fn, data);
 441     }
 442 }
 443
 444 const OSSL_PARAM *OSSL_SERIALIZER_settable_ctx_params(OSSL_SERIALIZER *ser)
 445 {
 446     if (ser != NULL && ser->settable_ctx_params != NULL)
 447         return ser->settable_ctx_params();
 448     return NULL;
 449 }
 450
 451 /*
 452  * Serializer context support
 453  */
 454
 455 /*
 456  * |ser| value NULL is valid, and signifies that there is no serializer.
 457  * This is useful to provide fallback mechanisms.
 458  *  Functions that want to verify if there is a serializer can do so with
 459  * OSSL_SERIALIZER_CTX_get_serializer()
 460  */
 461 OSSL_SERIALIZER_CTX *OSSL_SERIALIZER_CTX_new(OSSL_SERIALIZER *ser)
 462 {
 463     OSSL_SERIALIZER_CTX *ctx;
 464
 465     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 466         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_MALLOC_FAILURE);
 467         return NULL;
 468     }
 469
 470     ctx->ser = ser;
 471     if (ser != NULL && ser->newctx != NULL) {
 472         const OSSL_PROVIDER *prov = OSSL_SERIALIZER_provider(ser);
 473         void *provctx = ossl_provider_ctx(prov);
 474
 475         if (OSSL_SERIALIZER_up_ref(ser)) {
 476             ctx->serctx = ser->newctx(provctx);
 477         } else {
 478             OSSL_SERIALIZER_free(ser);
 479             OPENSSL_free(ctx);
 480             ctx = NULL;
 481         }
 482     }
 483
 484     return ctx;
 485 }
 486
 487 const OSSL_SERIALIZER *
 488 OSSL_SERIALIZER_CTX_get_serializer(OSSL_SERIALIZER_CTX *ctx)
 489 {
 490     if (!ossl_assert(ctx != NULL)) {
 491         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_PASSED_NULL_PARAMETER);
 492         return 0;
 493     }
 494
 495     return ctx->ser;
 496 }
 497
 498
 499 int OSSL_SERIALIZER_CTX_set_params(OSSL_SERIALIZER_CTX *ctx,
 500                                    const OSSL_PARAM params[])
 501 {
 502     if (!ossl_assert(ctx != NULL)) {
 503         ERR_raise(ERR_LIB_OSSL_SERIALIZER, ERR_R_PASSED_NULL_PARAMETER);
 504         return 0;
 505     }
 506
 507     if (ctx->ser != NULL && ctx->ser->set_ctx_params != NULL)
 508         return ctx->ser->set_ctx_params(ctx->serctx, params);
 509     return 0;
 510 }
 511
 512 void OSSL_SERIALIZER_CTX_free(OSSL_SERIALIZER_CTX *ctx)
 513 {
 514     if (ctx != NULL) {
 515         if (ctx->ser != NULL && ctx->ser->freectx != NULL)
 516             ctx->ser->freectx(ctx->serctx);
 517         OSSL_SERIALIZER_free(ctx->ser);
 518         UI_destroy_method(ctx->allocated_ui_method);
 519         OPENSSL_free(ctx);
 520     }
 521 }