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3b924da0f0
evp_keymgmt_util_get_deflt_digest_name() is a refactor of the provider side key part of EVP_PKEY_get_default_digest_name(), that takes EVP_KEYMGMT and provider keydata pointers instead of an EVP_PKEY pointer. We also ensure that it uses SN_undef as the default name if the provider implementation gave us an empty string, since this is what EVP_PKEY_get_default_digest_name() responds when getting the digest name via a EVP_PKEY_ASN1_METHOD ctrl call that returns NID_undef. Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/11576)
463 lines
14 KiB
C
463 lines
14 KiB
C
/*
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* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/core_names.h>
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#include "internal/cryptlib.h"
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#include "internal/nelem.h"
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#include "crypto/evp.h"
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#include "crypto/asn1.h"
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#include "internal/core.h"
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#include "internal/provider.h"
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#include "evp_local.h"
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/*
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* match_type() checks if two EVP_KEYMGMT are matching key types. This
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* function assumes that the caller has made all the necessary NULL checks.
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*/
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static int match_type(const EVP_KEYMGMT *keymgmt1, const EVP_KEYMGMT *keymgmt2)
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{
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const OSSL_PROVIDER *prov2 = EVP_KEYMGMT_provider(keymgmt2);
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const char *name2 = evp_first_name(prov2, EVP_KEYMGMT_number(keymgmt2));
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return EVP_KEYMGMT_is_a(keymgmt1, name2);
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}
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struct import_data_st {
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EVP_KEYMGMT *keymgmt;
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void *keydata;
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int selection;
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};
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static int try_import(const OSSL_PARAM params[], void *arg)
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{
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struct import_data_st *data = arg;
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/*
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* It's fine if there was no data to transfer, we just end up with an
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* empty destination key.
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*/
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if (params[0].key == NULL)
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return 1;
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/* Just in time creation of keydata, if needed */
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if (data->keydata == NULL
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&& (data->keydata = evp_keymgmt_newdata(data->keymgmt)) == NULL) {
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ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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return evp_keymgmt_import(data->keymgmt, data->keydata, data->selection,
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params);
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}
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void *evp_keymgmt_util_export_to_provider(EVP_PKEY *pk, EVP_KEYMGMT *keymgmt)
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{
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struct import_data_st import_data;
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size_t i = 0;
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/* Export to where? */
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if (keymgmt == NULL)
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return NULL;
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/* If we have an unassigned key, give up */
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if (pk->keydata == NULL)
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return NULL;
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/* If |keymgmt| matches the "origin" |keymgmt|, no more to do */
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if (pk->keymgmt == keymgmt)
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return pk->keydata;
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/* If this key is already exported to |keymgmt|, no more to do */
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i = evp_keymgmt_util_find_operation_cache_index(pk, keymgmt);
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if (i < OSSL_NELEM(pk->operation_cache)
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&& pk->operation_cache[i].keymgmt != NULL)
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return pk->operation_cache[i].keydata;
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/* If the "origin" |keymgmt| doesn't support exporting, give up */
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/*
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* TODO(3.0) consider an evp_keymgmt_export() return value that indicates
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* that the method is unsupported.
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*/
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if (pk->keymgmt->export == NULL)
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return NULL;
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/* Check that we have found an empty slot in the export cache */
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/*
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* TODO(3.0) Right now, we assume we have ample space. We will have to
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* think about a cache aging scheme, though, if |i| indexes outside the
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* array.
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*/
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if (!ossl_assert(i < OSSL_NELEM(pk->operation_cache)))
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return NULL;
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/*
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* Make sure that the type of the keymgmt to export to matches the type
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* of the "origin"
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*/
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if (!ossl_assert(match_type(pk->keymgmt, keymgmt)))
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return NULL;
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/*
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* We look at the already cached provider keys, and import from the
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* first that supports it (i.e. use its export function), and export
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* the imported data to the new provider.
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*/
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/* Setup for the export callback */
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import_data.keydata = NULL; /* try_import will create it */
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import_data.keymgmt = keymgmt;
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import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
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/*
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* The export function calls the callback (try_import), which does the
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* import for us. If successful, we're done.
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*/
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if (!evp_keymgmt_export(pk->keymgmt, pk->keydata, OSSL_KEYMGMT_SELECT_ALL,
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&try_import, &import_data)) {
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/* If there was an error, bail out */
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evp_keymgmt_freedata(keymgmt, import_data.keydata);
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return NULL;
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}
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/* Add the new export to the operation cache */
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if (!evp_keymgmt_util_cache_keydata(pk, i, keymgmt, import_data.keydata)) {
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evp_keymgmt_freedata(keymgmt, import_data.keydata);
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return NULL;
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}
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return import_data.keydata;
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}
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void evp_keymgmt_util_clear_operation_cache(EVP_PKEY *pk)
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{
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size_t i, end = OSSL_NELEM(pk->operation_cache);
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if (pk != NULL) {
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for (i = 0; i < end && pk->operation_cache[i].keymgmt != NULL; i++) {
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EVP_KEYMGMT *keymgmt = pk->operation_cache[i].keymgmt;
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void *keydata = pk->operation_cache[i].keydata;
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pk->operation_cache[i].keymgmt = NULL;
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pk->operation_cache[i].keydata = NULL;
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evp_keymgmt_freedata(keymgmt, keydata);
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EVP_KEYMGMT_free(keymgmt);
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}
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}
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}
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size_t evp_keymgmt_util_find_operation_cache_index(EVP_PKEY *pk,
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EVP_KEYMGMT *keymgmt)
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{
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size_t i, end = OSSL_NELEM(pk->operation_cache);
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for (i = 0; i < end && pk->operation_cache[i].keymgmt != NULL; i++) {
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if (keymgmt == pk->operation_cache[i].keymgmt)
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break;
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}
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return i;
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}
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int evp_keymgmt_util_cache_keydata(EVP_PKEY *pk, size_t index,
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EVP_KEYMGMT *keymgmt, void *keydata)
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{
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if (keydata != NULL) {
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if (!EVP_KEYMGMT_up_ref(keymgmt))
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return 0;
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pk->operation_cache[index].keydata = keydata;
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pk->operation_cache[index].keymgmt = keymgmt;
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}
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return 1;
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}
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void evp_keymgmt_util_cache_keyinfo(EVP_PKEY *pk)
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{
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/*
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* Cache information about the provider "origin" key.
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*
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* This services functions like EVP_PKEY_size, EVP_PKEY_bits, etc
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*/
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if (pk->keydata != NULL) {
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int bits = 0;
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int security_bits = 0;
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int size = 0;
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OSSL_PARAM params[4];
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params[0] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_BITS, &bits);
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params[1] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_SECURITY_BITS,
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&security_bits);
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params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_MAX_SIZE, &size);
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params[3] = OSSL_PARAM_construct_end();
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if (evp_keymgmt_get_params(pk->keymgmt, pk->keydata, params)) {
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pk->cache.size = size;
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pk->cache.bits = bits;
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pk->cache.security_bits = security_bits;
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}
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}
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}
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void *evp_keymgmt_util_fromdata(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
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int selection, const OSSL_PARAM params[])
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{
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void *keydata = NULL;
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if ((keydata = evp_keymgmt_newdata(keymgmt)) == NULL
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|| !evp_keymgmt_import(keymgmt, keydata, selection, params)
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|| !EVP_PKEY_set_type_by_keymgmt(target, keymgmt)) {
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evp_keymgmt_freedata(keymgmt, keydata);
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keydata = NULL;
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}
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if (keydata != NULL) {
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target->keydata = keydata;
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evp_keymgmt_util_cache_keyinfo(target);
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}
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return keydata;
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}
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int evp_keymgmt_util_has(EVP_PKEY *pk, int selection)
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{
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/* Check if key is even assigned */
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if (pk->keymgmt == NULL)
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return 0;
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return evp_keymgmt_has(pk->keymgmt, pk->keydata, selection);
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}
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/*
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* evp_keymgmt_util_match() doesn't just look at the provider side "origin",
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* but also in the operation cache to see if there's any common keymgmt that
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* supplies OP_keymgmt_match.
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*
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* evp_keymgmt_util_match() adheres to the return values that EVP_PKEY_cmp()
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* and EVP_PKEY_cmp_parameters() return, i.e.:
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*
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* 1 same key
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* 0 not same key
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* -1 not same key type
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* -2 unsupported operation
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*/
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int evp_keymgmt_util_match(EVP_PKEY *pk1, EVP_PKEY *pk2, int selection)
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{
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EVP_KEYMGMT *keymgmt1 = NULL, *keymgmt2 = NULL;
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void *keydata1 = NULL, *keydata2 = NULL;
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if (pk1 == NULL || pk2 == NULL) {
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if (pk1 == NULL && pk2 == NULL)
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return 1;
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return 0;
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}
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keymgmt1 = pk1->keymgmt;
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keydata1 = pk1->keydata;
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keymgmt2 = pk2->keymgmt;
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keydata2 = pk2->keydata;
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if (keymgmt1 != keymgmt2) {
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/*
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* The condition for a successful cross export is that the
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* keydata to be exported is NULL (typed, but otherwise empty
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* EVP_PKEY), or that it was possible to export it with
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* evp_keymgmt_util_export_to_provider().
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*
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* We use |ok| to determine if it's ok to cross export one way,
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* but also to determine if we should attempt a cross export
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* the other way. There's no point doing it both ways.
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*/
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int ok = 1;
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/* Complex case, where the keymgmt differ */
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if (keymgmt1 != NULL
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&& keymgmt2 != NULL
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&& !match_type(keymgmt1, keymgmt2)) {
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ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
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return -1; /* Not the same type */
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}
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/*
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* The key types are determined to match, so we try cross export,
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* but only to keymgmt's that supply a matching function.
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*/
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if (keymgmt2 != NULL
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&& keymgmt2->match != NULL) {
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void *tmp_keydata = NULL;
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ok = 1;
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if (keydata1 != NULL) {
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tmp_keydata =
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evp_keymgmt_util_export_to_provider(pk1, keymgmt2);
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ok = (tmp_keydata != NULL);
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}
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if (ok) {
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keymgmt1 = keymgmt2;
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keydata1 = tmp_keydata;
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}
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}
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/*
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* If we've successfully cross exported one way, there's no point
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* doing it the other way, hence the |!ok| check.
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*/
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if (!ok
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&& keymgmt1 != NULL
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&& keymgmt1->match != NULL) {
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void *tmp_keydata = NULL;
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ok = 1;
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if (keydata2 != NULL) {
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tmp_keydata =
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evp_keymgmt_util_export_to_provider(pk2, keymgmt1);
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ok = (tmp_keydata != NULL);
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}
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if (ok) {
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keymgmt2 = keymgmt1;
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keydata2 = tmp_keydata;
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}
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}
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}
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/* If we still don't have matching keymgmt implementations, we give up */
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if (keymgmt1 != keymgmt2)
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return -2;
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/* If both keydata are NULL, then they're the same key */
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if (keydata1 == NULL && keydata2 == NULL)
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return 1;
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/* If only one of the keydata is NULL, then they're different keys */
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if (keydata1 == NULL || keydata2 == NULL)
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return 0;
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/* If both keydata are non-NULL, we let the backend decide */
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return evp_keymgmt_match(keymgmt1, keydata1, keydata2, selection);
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}
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int evp_keymgmt_util_copy(EVP_PKEY *to, EVP_PKEY *from, int selection)
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{
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/* Save copies of pointers we want to play with without affecting |to| */
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EVP_KEYMGMT *to_keymgmt = to->keymgmt;
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void *to_keydata = to->keydata, *alloc_keydata = NULL;
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/* An unassigned key can't be copied */
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if (from == NULL || from->keydata == NULL)
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return 0;
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if (to_keymgmt == from->keymgmt && to_keymgmt->copy != NULL) {
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/* Make sure there's somewhere to copy to */
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if (to_keydata == NULL
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&& (to_keydata = evp_keymgmt_newdata(to_keymgmt)) == NULL) {
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ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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/*
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* |to| and |from| have the same keymgmt, and the copy function is
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* implemented, so just copy and be done
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*/
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if (!evp_keymgmt_copy(to_keymgmt, to_keydata, from->keydata,
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selection))
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return 0;
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} else if (match_type(to_keymgmt, from->keymgmt)) {
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struct import_data_st import_data;
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import_data.keymgmt = to_keymgmt;
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import_data.keydata = to_keydata;
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import_data.selection = selection;
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if (!evp_keymgmt_export(from->keymgmt, from->keydata, selection,
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&try_import, &import_data)) {
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evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
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return 0;
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}
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/*
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* In this case to_keydata was previously unallocated, try_import()
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* may have created it for us.
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*/
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to_keydata = import_data.keydata;
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} else {
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ERR_raise(ERR_LIB_EVP, EVP_R_DIFFERENT_KEY_TYPES);
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return 0;
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}
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if (to->keymgmt == NULL
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&& !EVP_PKEY_set_type_by_keymgmt(to, to_keymgmt)) {
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evp_keymgmt_freedata(to_keymgmt, alloc_keydata);
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return 0;
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}
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to->keydata = to_keydata;
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evp_keymgmt_util_cache_keyinfo(to);
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return 1;
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}
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void *evp_keymgmt_util_gen(EVP_PKEY *target, EVP_KEYMGMT *keymgmt,
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void *genctx, OSSL_CALLBACK *cb, void *cbarg)
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{
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void *keydata = NULL;
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if ((keydata = evp_keymgmt_gen(keymgmt, genctx, cb, cbarg)) == NULL
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|| !EVP_PKEY_set_type_by_keymgmt(target, keymgmt)) {
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evp_keymgmt_freedata(keymgmt, keydata);
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keydata = NULL;
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}
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if (keydata != NULL) {
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target->keydata = keydata;
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evp_keymgmt_util_cache_keyinfo(target);
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}
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return keydata;
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}
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/*
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* Returns the same numbers as EVP_PKEY_get_default_digest_name()
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* When the string from the EVP_KEYMGMT implementation is "", we use
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* SN_undef, since that corresponds to what EVP_PKEY_get_default_nid()
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* returns for no digest.
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*/
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int evp_keymgmt_util_get_deflt_digest_name(EVP_KEYMGMT *keymgmt,
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void *keydata,
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char *mdname, size_t mdname_sz)
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{
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OSSL_PARAM params[3];
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char mddefault[100] = "";
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char mdmandatory[100] = "";
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char *result = NULL;
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int rv = -2;
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params[0] =
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OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST,
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mddefault, sizeof(mddefault));
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params[0].return_size = sizeof(mddefault) + 1;
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params[1] =
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OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_MANDATORY_DIGEST,
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mdmandatory,
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sizeof(mdmandatory));
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params[1].return_size = sizeof(mdmandatory) + 1;
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params[2] = OSSL_PARAM_construct_end();
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if (!evp_keymgmt_get_params(keymgmt, keydata, params))
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return 0;
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if (params[1].return_size != sizeof(mdmandatory) + 1) {
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if (params[1].return_size == 1) /* Only a NUL byte */
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result = SN_undef;
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else
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result = mdmandatory;
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rv = 2;
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} else if (params[0].return_size != sizeof(mddefault) + 1) {
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if (params[0].return_size == 1) /* Only a NUL byte */
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result = SN_undef;
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else
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result = mddefault;
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rv = 1;
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}
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if (rv > 0)
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OPENSSL_strlcpy(mdname, result, mdname_sz);
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return rv;
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}
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