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         /*
  43          * Note regarding putting the method in stores:
  44          *
  45          * we don't need to care if it actually got in or not here.
  46          * If it didn't get in, it will simply not be available when
  47          * ossl_method_construct() tries to get it from the store.
  48          *
  49          * It is *expected* that the put function increments the refcnt
  50          * of the passed method.
  51          */
  52
  53         if (data->force_store || !no_store) {
  54             /*
  55              * If we haven't been told not to store,
  56              * add to the global store
  57              */
  58             data->mcm->put(data->libctx, NULL,
  59                            thismap->property_definition,
  60                            method, data->mcm_data);
  61         }
  62
  63         data->mcm->put(data->libctx, data->store,
  64                        thismap->property_definition,
  65                        method, data->mcm_data);
  66
  67         /* refcnt-- because we're dropping the reference */
  68         data->mcm->destruct(method, data->mcm_data);
  69     }
  70
  71     return 1;
  72 }
  73
  74 void *ossl_method_construct(OPENSSL_CTX *libctx, int operation_id,
  75                             const char *name, const char *propquery,
  76                             int force_store,
  77                             OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
  78 {
  79     void *method = NULL;
  80
  81     if ((method = mcm->get(libctx, NULL, propquery, mcm_data)) == NULL) {
  82         struct construct_data_st cbdata;
  83
  84         /*
  85          * We have a temporary store to be able to easily search among new
  86          * items, or items that should find themselves in the global store.
  87          */
  88         if ((cbdata.store = mcm->alloc_tmp_store()) == NULL)
  89             goto fin;
  90
  91         cbdata.libctx = libctx;
  92         cbdata.operation_id = operation_id;
  93         cbdata.force_store = force_store;
  94         cbdata.mcm = mcm;
  95         cbdata.mcm_data = mcm_data;
  96         ossl_provider_forall_loaded(libctx, ossl_method_construct_this,
  97                                     &cbdata);
  98
  99         method = mcm->get(libctx, cbdata.store, propquery, mcm_data);
 100         mcm->dealloc_tmp_store(cbdata.store);
 101     }
 102
 103  fin:
 104     return method;
 105 }