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     if (map == NULL)
  35         return 0;
  36
  37     while (map->algorithm_name != NULL) {
  38         const OSSL_ALGORITHM *thismap = map++;
  39         void *method = NULL;
  40
  41         if ((method = data->mcm->construct(thismap->algorithm_name,
  42                                            thismap->implementation, provider,
  43                                            data->mcm_data)) == NULL)
  44             continue;
  45
  46         /*
  47          * Note regarding putting the method in stores:
  48          *
  49          * we don't need to care if it actually got in or not here.
  50          * If it didn't get in, it will simply not be available when
  51          * ossl_method_construct() tries to get it from the store.
  52          *
  53          * It is *expected* that the put function increments the refcnt
  54          * of the passed method.
  55          */
  56
  57         if (data->force_store || !no_store) {
  58             /*
  59              * If we haven't been told not to store,
  60              * add to the global store
  61              */
  62             data->mcm->put(data->libctx, NULL, method, data->operation_id,
  63                            thismap->algorithm_name,
  64                            thismap->property_definition, data->mcm_data);
  65         }
  66
  67         data->mcm->put(data->libctx, data->store, method, data->operation_id,
  68                        thismap->algorithm_name, thismap->property_definition,
  69                        data->mcm_data);
  70
  71         /* refcnt-- because we're dropping the reference */
  72         data->mcm->destruct(method, data->mcm_data);
  73     }
  74
  75     return 1;
  76 }
  77
  78 void *ossl_method_construct(OPENSSL_CTX *libctx, int operation_id,
  79                             const char *name, const char *propquery,
  80                             int force_store,
  81                             OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
  82 {
  83     void *method = NULL;
  84
  85     if ((method =
  86          mcm->get(libctx, NULL, operation_id, name, propquery, mcm_data))
  87         == NULL) {
  88         struct construct_data_st cbdata;
  89
  90         /*
  91          * We have a temporary store to be able to easily search among new
  92          * items, or items that should find themselves in the global store.
  93          */
  94         if ((cbdata.store = mcm->alloc_tmp_store(libctx)) == NULL)
  95             goto fin;
  96
  97         cbdata.libctx = libctx;
  98         cbdata.operation_id = operation_id;
  99         cbdata.force_store = force_store;
 100         cbdata.mcm = mcm;
 101         cbdata.mcm_data = mcm_data;
 102         ossl_provider_forall_loaded(libctx, ossl_method_construct_this,
 103                                     &cbdata);
 104
 105         method = mcm->get(libctx, cbdata.store, operation_id, name,
 106                           propquery, mcm_data);
 107         mcm->dealloc_tmp_store(cbdata.store);
 108     }
 109
 110  fin:
 111     return method;
 112 }