crypto/core_fetch.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 <stddef.h>
  11
  12 #include <openssl/core.h>
  13 #include "internal/cryptlib.h"
  14 #include "internal/core.h"
  15 #include "internal/property.h"
  16 #include "internal/provider.h"
  17
  18 struct construct_data_st {
  19     OPENSSL_CTX *libctx;
  20     OSSL_METHOD_STORE *store;
  21     int operation_id;
  22     int force_store;
  23     OSSL_METHOD_CONSTRUCT_METHOD *mcm;
  24     void *mcm_data;
  25 };
  26
  27 static int ossl_method_construct_this(OSSL_PROVIDER *provider, void *cbdata)
  28 {
  29     struct construct_data_st *data = cbdata;
  30     int no_store = 0;    /* Assume caching is ok */
  31     const OSSL_ALGORITHM *map =
  32         ossl_provider_query_operation(provider, data->operation_id, &no_store);
  33
  34     while (map->algorithm_name != NULL) {
  35         const OSSL_ALGORITHM *thismap = map++;
  36         void *method = NULL;
  37
  38         if ((method = data->mcm->construct(thismap->implementation, provider,
  39                                             data->mcm_data)) == NULL)
  40             continue;
  41
  42         if (data->force_store || !no_store) {
  43             /*
  44              * If we haven't been told not to store,
  45              * add to the global store
  46              */
  47             if (!data->mcm->put(data->libctx, NULL,
  48                                 thismap->property_definition,
  49                                 method, data->mcm_data)) {
  50                 data->mcm->destruct(method, data->mcm_data);
  51                 continue;
  52             }
  53         }
  54
  55         if (!data->mcm->put(data->libctx, data->store,
  56                             thismap->property_definition,
  57                             method, data->mcm_data)) {
  58             data->mcm->destruct(method, data->mcm_data);
  59             continue;
  60         }
  61     }
  62
  63     return 1;
  64 }
  65
  66 void *ossl_method_construct(OPENSSL_CTX *libctx, int operation_id,
  67                             const char *name, const char *propquery,
  68                             int force_store,
  69                             OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
  70 {
  71     void *method = NULL;
  72
  73     if ((method = mcm->get(libctx, NULL, propquery, mcm_data)) == NULL) {
  74         struct construct_data_st cbdata;
  75
  76         /*
  77          * We have a temporary store to be able to easily search among new
  78          * items, or items that should find themselves in the global store.
  79          */
  80         if ((cbdata.store = mcm->alloc_tmp_store()) == NULL)
  81             goto fin;
  82
  83         cbdata.libctx = libctx;
  84         cbdata.operation_id = operation_id;
  85         cbdata.force_store = force_store;
  86         cbdata.mcm = mcm;
  87         cbdata.mcm_data = mcm_data;
  88         ossl_provider_forall_loaded(libctx, ossl_method_construct_this,
  89                                     &cbdata);
  90
  91         method = mcm->get(libctx, cbdata.store, propquery, mcm_data);
  92         mcm->dealloc_tmp_store(cbdata.store);
  93     }
  94
  95  fin:
  96     return method;
  97 }