crypto/evp/keymgmt_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/crypto.h>
  11 #include <openssl/core_numbers.h>
  12 #include <openssl/evp.h>
  13 #include <openssl/err.h>
  14 #include "internal/provider.h"
  15 #include "internal/refcount.h"
  16 #include "crypto/evp.h"
  17 #include "evp_local.h"
  18
  19
  20 static void *keymgmt_new(void)
  21 {
  22     EVP_KEYMGMT *keymgmt = NULL;
  23
  24     if ((keymgmt = OPENSSL_zalloc(sizeof(*keymgmt))) == NULL
  25         || (keymgmt->lock = CRYPTO_THREAD_lock_new()) == NULL) {
  26         EVP_KEYMGMT_free(keymgmt);
  27         EVPerr(0, ERR_R_MALLOC_FAILURE);
  28         return NULL;
  29     }
  30
  31     keymgmt->refcnt = 1;
  32
  33     return keymgmt;
  34 }
  35
  36 static void *keymgmt_from_dispatch(int name_id,
  37                                    const OSSL_DISPATCH *fns,
  38                                    OSSL_PROVIDER *prov,
  39                                    void *unused)
  40 {
  41     EVP_KEYMGMT *keymgmt = NULL;
  42
  43     if ((keymgmt = keymgmt_new()) == NULL) {
  44         EVP_KEYMGMT_free(keymgmt);
  45         return NULL;
  46     }
  47     keymgmt->name_id = name_id;
  48
  49     for (; fns->function_id != 0; fns++) {
  50         switch (fns->function_id) {
  51         case OSSL_FUNC_KEYMGMT_IMPORTDOMPARAMS:
  52             if (keymgmt->importdomparams != NULL)
  53                 break;
  54             keymgmt->importdomparams =
  55                 OSSL_get_OP_keymgmt_importdomparams(fns);
  56             break;
  57         case OSSL_FUNC_KEYMGMT_GENDOMPARAMS:
  58             if (keymgmt->gendomparams != NULL)
  59                 break;
  60             keymgmt->gendomparams = OSSL_get_OP_keymgmt_gendomparams(fns);
  61             break;
  62         case OSSL_FUNC_KEYMGMT_FREEDOMPARAMS:
  63             if (keymgmt->freedomparams != NULL)
  64                 break;
  65             keymgmt->freedomparams = OSSL_get_OP_keymgmt_freedomparams(fns);
  66             break;
  67         case OSSL_FUNC_KEYMGMT_EXPORTDOMPARAMS:
  68             if (keymgmt->exportdomparams != NULL)
  69                 break;
  70             keymgmt->exportdomparams =
  71                 OSSL_get_OP_keymgmt_exportdomparams(fns);
  72             break;
  73         case OSSL_FUNC_KEYMGMT_IMPORTDOMPARAM_TYPES:
  74             if (keymgmt->importdomparam_types != NULL)
  75                 break;
  76             keymgmt->importdomparam_types =
  77                 OSSL_get_OP_keymgmt_importdomparam_types(fns);
  78             break;
  79         case OSSL_FUNC_KEYMGMT_EXPORTDOMPARAM_TYPES:
  80             if (keymgmt->exportdomparam_types != NULL)
  81                 break;
  82             keymgmt->exportdomparam_types =
  83                 OSSL_get_OP_keymgmt_exportdomparam_types(fns);
  84             break;
  85         case OSSL_FUNC_KEYMGMT_IMPORTKEY:
  86             if (keymgmt->importkey != NULL)
  87                 break;
  88             keymgmt->importkey = OSSL_get_OP_keymgmt_importkey(fns);
  89             break;
  90         case OSSL_FUNC_KEYMGMT_GENKEY:
  91             if (keymgmt->genkey != NULL)
  92                 break;
  93             keymgmt->genkey = OSSL_get_OP_keymgmt_genkey(fns);
  94             break;
  95         case OSSL_FUNC_KEYMGMT_LOADKEY:
  96             if (keymgmt->loadkey != NULL)
  97                 break;
  98             keymgmt->loadkey = OSSL_get_OP_keymgmt_loadkey(fns);
  99             break;
 100         case OSSL_FUNC_KEYMGMT_FREEKEY:
 101             if (keymgmt->freekey != NULL)
 102                 break;
 103             keymgmt->freekey = OSSL_get_OP_keymgmt_freekey(fns);
 104             break;
 105         case OSSL_FUNC_KEYMGMT_EXPORTKEY:
 106             if (keymgmt->exportkey != NULL)
 107                 break;
 108             keymgmt->exportkey = OSSL_get_OP_keymgmt_exportkey(fns);
 109             break;
 110         case OSSL_FUNC_KEYMGMT_IMPORTKEY_TYPES:
 111             if (keymgmt->importkey_types != NULL)
 112                 break;
 113             keymgmt->importkey_types =
 114                 OSSL_get_OP_keymgmt_importkey_types(fns);
 115             break;
 116         case OSSL_FUNC_KEYMGMT_EXPORTKEY_TYPES:
 117             if (keymgmt->exportkey_types != NULL)
 118                 break;
 119             keymgmt->exportkey_types =
 120                 OSSL_get_OP_keymgmt_exportkey_types(fns);
 121             break;
 122         }
 123     }
 124     /*
 125      * Try to check that the method is sensible.
 126      * It makes no sense being able to free stuff if you can't create it.
 127      * It makes no sense providing OSSL_PARAM descriptors for import and
 128      * export if you can't import or export.
 129      */
 130     if ((keymgmt->freedomparams != NULL
 131          && (keymgmt->importdomparams == NULL
 132              && keymgmt->gendomparams == NULL))
 133         || (keymgmt->freekey != NULL
 134             && (keymgmt->importkey == NULL
 135                 && keymgmt->genkey == NULL
 136                 && keymgmt->loadkey == NULL))
 137         || (keymgmt->importdomparam_types != NULL
 138             && keymgmt->importdomparams == NULL)
 139         || (keymgmt->exportdomparam_types != NULL
 140             && keymgmt->exportdomparams == NULL)
 141         || (keymgmt->importkey_types != NULL
 142             && keymgmt->importkey == NULL)
 143         || (keymgmt->exportkey_types != NULL
 144             && keymgmt->exportkey == NULL)) {
 145         EVP_KEYMGMT_free(keymgmt);
 146         EVPerr(0, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 147         return NULL;
 148     }
 149     keymgmt->prov = prov;
 150     if (prov != NULL)
 151         ossl_provider_up_ref(prov);
 152
 153     return keymgmt;
 154 }
 155
 156 EVP_KEYMGMT *evp_keymgmt_fetch_by_number(OPENSSL_CTX *ctx, int name_id,
 157                                          const char *properties)
 158 {
 159     return evp_generic_fetch_by_number(ctx,
 160                                        OSSL_OP_KEYMGMT, name_id, properties,
 161                                        keymgmt_from_dispatch, NULL,
 162                                        (int (*)(void *))EVP_KEYMGMT_up_ref,
 163                                        (void (*)(void *))EVP_KEYMGMT_free);
 164 }
 165
 166 EVP_KEYMGMT *EVP_KEYMGMT_fetch(OPENSSL_CTX *ctx, const char *algorithm,
 167                                const char *properties)
 168 {
 169     return evp_generic_fetch(ctx, OSSL_OP_KEYMGMT, algorithm, properties,
 170                              keymgmt_from_dispatch, NULL,
 171                              (int (*)(void *))EVP_KEYMGMT_up_ref,
 172                              (void (*)(void *))EVP_KEYMGMT_free);
 173 }
 174
 175 int EVP_KEYMGMT_up_ref(EVP_KEYMGMT *keymgmt)
 176 {
 177     int ref = 0;
 178
 179     CRYPTO_UP_REF(&keymgmt->refcnt, &ref, keymgmt->lock);
 180     return 1;
 181 }
 182
 183 void EVP_KEYMGMT_free(EVP_KEYMGMT *keymgmt)
 184 {
 185     int ref = 0;
 186
 187     if (keymgmt == NULL)
 188         return;
 189
 190     CRYPTO_DOWN_REF(&keymgmt->refcnt, &ref, keymgmt->lock);
 191     if (ref > 0)
 192         return;
 193     ossl_provider_free(keymgmt->prov);
 194     CRYPTO_THREAD_lock_free(keymgmt->lock);
 195     OPENSSL_free(keymgmt);
 196 }
 197
 198 const OSSL_PROVIDER *EVP_KEYMGMT_provider(const EVP_KEYMGMT *keymgmt)
 199 {
 200     return keymgmt->prov;
 201 }
 202