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