EVP: Implement support for key downgrading in backends
Downgrading EVP_PKEYs from containing provider side internal keys to containing legacy keys demands support in the EVP_PKEY_ASN1_METHOD. This became a bit elaborate because the code would be almost exactly the same as the import functions int EVP_KEYMGMT. Therefore, we end up moving most of the code to common backend support files that can be used both by legacy backend code and by our providers. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11375)master
Richard Levitte
3 years ago
parent
ff7262b4f4
commit
0abae1636d
@ -0,0 +1,56 @@
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/*
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* Copyright 2020 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 "crypto/dh.h"
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/*
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* The intention with the "backend" source file is to offer backend functions
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int dh_key_fromdata(DH *dh, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dh == NULL)
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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/*
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* DH documentation says that a public key must be present if a
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* private key is present.
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* We want to have at least a public key either way, so we end up
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* requiring it unconditionally.
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*/
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if (param_priv_key != NULL && param_pub_key == NULL)
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return 0;
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if ((param_priv_key != NULL
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&& !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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|| (param_pub_key != NULL
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&& !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
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goto err;
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if (!DH_set0_key(dh, pub_key, priv_key))
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goto err;
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return 1;
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err:
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BN_clear_free(priv_key);
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BN_free(pub_key);
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return 0;
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}
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@ -0,0 +1,57 @@
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/*
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* Copyright 2020 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 "crypto/dsa.h"
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/*
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* The intention with the "backend" source file is to offer backend support
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int dsa_key_fromdata(DSA *dsa, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dsa == NULL)
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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/* It's ok if neither half is present */
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if (param_priv_key == NULL && param_pub_key == NULL)
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return 1;
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/*
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* DH documentation says that a public key must be present if a
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* private key is present.
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*/
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if (param_priv_key != NULL && param_pub_key == NULL)
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return 0;
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if (param_pub_key != NULL && !OSSL_PARAM_get_BN(param_pub_key, &pub_key))
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goto err;
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if (param_priv_key != NULL && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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goto err;
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if (!DSA_set0_key(dsa, pub_key, priv_key))
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goto err;
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return 1;
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err:
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BN_clear_free(priv_key);
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BN_free(pub_key);
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return 0;
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}
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@ -0,0 +1,229 @@
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/*
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* Copyright 2020 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 <openssl/objects.h>
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#include <openssl/params.h>
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#include "crypto/bn.h"
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#include "crypto/ec.h"
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/*
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* The intention with the "backend" source file is to offer backend support
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int ec_set_param_ecdh_cofactor_mode(EC_KEY *ec, const OSSL_PARAM *p)
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{
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const EC_GROUP *ecg = EC_KEY_get0_group(ec);
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const BIGNUM *cofactor;
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int mode;
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if (!OSSL_PARAM_get_int(p, &mode))
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return 0;
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/*
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* mode can be only 0 for disable, or 1 for enable here.
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*
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* This is in contrast with the same parameter on an ECDH EVP_PKEY_CTX that
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* also supports mode == -1 with the meaning of "reset to the default for
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* the associated key".
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*/
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if (mode < 0 || mode > 1)
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return 0;
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if ((cofactor = EC_GROUP_get0_cofactor(ecg)) == NULL )
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return 0;
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/* ECDH cofactor mode has no effect if cofactor is 1 */
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if (BN_is_one(cofactor))
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return 1;
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if (mode == 1)
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EC_KEY_set_flags(ec, EC_FLAG_COFACTOR_ECDH);
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else if (mode == 0)
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EC_KEY_clear_flags(ec, EC_FLAG_COFACTOR_ECDH);
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return 1;
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}
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/*
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* Callers of ec_key_fromdata MUST make sure that ec_key_params_fromdata has
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* been called before!
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*
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* This function only gets the bare keypair, domain parameters and other
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* parameters are treated separately, and domain parameters are required to
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* define a keypair.
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*/
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int ec_key_fromdata(EC_KEY *ec, const OSSL_PARAM params[], int include_private)
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BN_CTX *ctx = NULL;
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BIGNUM *priv_key = NULL;
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unsigned char *pub_key = NULL;
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size_t pub_key_len;
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const EC_GROUP *ecg = NULL;
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EC_POINT *pub_point = NULL;
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int ok = 0;
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ecg = EC_KEY_get0_group(ec);
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if (ecg == NULL)
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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ctx = BN_CTX_new_ex(ec_key_get_libctx(ec));
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if (ctx == NULL)
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goto err;
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/*
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* We want to have at least a public key either way, so we end up
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* requiring it unconditionally.
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*/
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if (param_pub_key == NULL
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|| !OSSL_PARAM_get_octet_string(param_pub_key,
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(void **)&pub_key, 0, &pub_key_len)
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|| (pub_point = EC_POINT_new(ecg)) == NULL
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|| !EC_POINT_oct2point(ecg, pub_point,
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pub_key, pub_key_len, ctx))
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goto err;
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if (param_priv_key != NULL && include_private) {
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int fixed_words;
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const BIGNUM *order;
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/*
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* Key import/export should never leak the bit length of the secret
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* scalar in the key.
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*
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* For this reason, on export we use padded BIGNUMs with fixed length.
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*
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* When importing we also should make sure that, even if short lived,
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* the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
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* soon as possible, so that any processing of this BIGNUM might opt for
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* constant time implementations in the backend.
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*
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* Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
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* to preallocate the BIGNUM internal buffer to a fixed public size big
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* enough that operations performed during the processing never trigger
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* a realloc which would leak the size of the scalar through memory
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* accesses.
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*
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* Fixed Length
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* ------------
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*
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* The order of the large prime subgroup of the curve is our choice for
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* a fixed public size, as that is generally the upper bound for
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* generating a private key in EC cryptosystems and should fit all valid
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* secret scalars.
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*
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* For padding on export we just use the bit length of the order
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* converted to bytes (rounding up).
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*
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* For preallocating the BIGNUM storage we look at the number of "words"
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* required for the internal representation of the order, and we
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* preallocate 2 extra "words" in case any of the subsequent processing
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* might temporarily overflow the order length.
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*/
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order = EC_GROUP_get0_order(ecg);
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if (order == NULL || BN_is_zero(order))
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goto err;
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fixed_words = bn_get_top(order) + 2;
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if ((priv_key = BN_secure_new()) == NULL)
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goto err;
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if (bn_wexpand(priv_key, fixed_words) == NULL)
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goto err;
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BN_set_flags(priv_key, BN_FLG_CONSTTIME);
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if (!OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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goto err;
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}
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if (priv_key != NULL
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&& !EC_KEY_set_private_key(ec, priv_key))
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goto err;
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if (!EC_KEY_set_public_key(ec, pub_point))
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goto err;
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ok = 1;
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err:
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BN_CTX_free(ctx);
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BN_clear_free(priv_key);
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OPENSSL_free(pub_key);
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EC_POINT_free(pub_point);
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return ok;
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}
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int ec_key_domparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_ec_name;
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EC_GROUP *ecg = NULL;
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char *curve_name = NULL;
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int ok = 0;
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if (ec == NULL)
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return 0;
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param_ec_name = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_NAME);
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if (param_ec_name == NULL) {
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/* explicit parameters */
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/*
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* TODO(3.0): should we support explicit parameters curves?
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*/
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return 0;
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} else {
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/* named curve */
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int curve_nid;
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if (!OSSL_PARAM_get_utf8_string(param_ec_name, &curve_name, 0)
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|| curve_name == NULL
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|| (curve_nid = ec_curve_name2nid(curve_name)) == NID_undef)
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goto err;
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if ((ecg = EC_GROUP_new_by_curve_name_ex(ec_key_get_libctx(ec),
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curve_nid)) == NULL)
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goto err;
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}
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if (!EC_KEY_set_group(ec, ecg))
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goto err;
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/*
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* TODO(3.0): if the group has changed, should we invalidate the private and
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* public key?
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*/
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ok = 1;
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err:
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OPENSSL_free(curve_name);
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EC_GROUP_free(ecg);
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return ok;
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}
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int ec_key_otherparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *p;
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if (ec == NULL)
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return 0;
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p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
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if (p != NULL && !ec_set_param_ecdh_cofactor_mode(ec, p))
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return 0;
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return 1;
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}
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@ -0,0 +1,62 @@
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/*
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* Copyright 2020 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 <openssl/params.h>
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#include "crypto/ecx.h"
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#include "ecx_backend.h"
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/*
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* The intention with the "backend" source file is to offer backend support
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int ecx_key_fromdata(ECX_KEY *ecx, const OSSL_PARAM params[],
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int include_private)
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{
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size_t privkeylen = 0, pubkeylen;
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const OSSL_PARAM *param_priv_key = NULL, *param_pub_key;
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unsigned char *pubkey;
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if (ecx == NULL)
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return 0;
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param_pub_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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if (include_private)
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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/*
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* If a private key is present then a public key must also be present.
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* Alternatively we've just got a public key.
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*/
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if (param_pub_key == NULL)
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return 0;
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if (param_priv_key != NULL
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&& !OSSL_PARAM_get_octet_string(param_priv_key,
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(void **)&ecx->privkey, ecx->keylen,
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&privkeylen))
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return 0;
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pubkey = ecx->pubkey;
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if (!OSSL_PARAM_get_octet_string(param_pub_key,
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(void **)&pubkey,
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sizeof(ecx->pubkey), &pubkeylen))
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return 0;
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if (pubkeylen != ecx->keylen
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|| (param_priv_key != NULL && privkeylen != ecx->keylen))
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return 0;
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ecx->haspubkey = 1;
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return 1;
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}
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@ -0,0 +1,20 @@
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/*
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* Copyright 2020 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
|
||||
* 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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#define ISX448(id) ((id) == EVP_PKEY_X448)
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#define IS25519(id) ((id) == EVP_PKEY_X25519 || (id) == EVP_PKEY_ED25519)
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#define KEYLENID(id) (IS25519(id) ? X25519_KEYLEN \
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: ((id) == EVP_PKEY_X448 ? X448_KEYLEN \
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: ED448_KEYLEN))
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#define KEYNID2TYPE(id) \
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(IS25519(id) ? ECX_KEY_TYPE_X25519 \
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: ((id) == EVP_PKEY_X448 ? ECX_KEY_TYPE_X448 \
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: ((id) == EVP_PKEY_ED25519 ? ECX_KEY_TYPE_ED25519 \
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: ECX_KEY_TYPE_ED448)))
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#define KEYLEN(p) KEYLENID((p)->ameth->pkey_id)
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@ -1,7 +1,7 @@
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LIBS=../../libcrypto
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$COMMON=ffc_params.c ffc_params_generate.c ffc_key_generate.c\
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ffc_params_validate.c ffc_key_validate.c
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ffc_params_validate.c ffc_key_validate.c ffc_backend.c
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SOURCE[../../libcrypto]=$COMMON
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SOURCE[../../providers/libfips.a]=$COMMON
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@ -0,0 +1,44 @@
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/*
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* Copyright 2020 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
|
||||
* this file except in compliance with the License. You can obtain a copy
|
||||
* in the file LICENSE in the source distribution or at
|
||||
* https://www.openssl.org/source/license.html
|
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*/
|
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|
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#include <openssl/core_names.h>
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#include "internal/ffc.h"
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|
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/*
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* The intention with the "backend" source file is to offer backend support
|
||||
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
|
||||
* implementations alike.
|
||||
*/
|
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|
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int ffc_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_p, *param_q, *param_g;
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BIGNUM *p = NULL, *q = NULL, *g = NULL;
|
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|
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if (ffc == NULL)
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return 0;
|
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|
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param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
|
||||
param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
|
||||
param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
|
||||
|
||||
if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
|
||||
|| (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
|
||||
|| (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
|
||||
goto err;
|
||||
|
||||
ffc_params_set0_pqg(ffc, p, q, g);
|
||||
return 1;
|
||||
|
||||
err:
|
||||
BN_free(p);
|
||||
BN_free(q);
|
||||
BN_free(g);
|
||||
return 0;
|
||||
}
|
||||
@ -0,0 +1,95 @@
|
||||
/*
|
||||
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
|
||||
*
|
||||
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
||||
* this file except in compliance with the License. You can obtain a copy
|
||||
* in the file LICENSE in the source distribution or at
|
||||
* https://www.openssl.org/source/license.html
|
||||
*/
|
||||
|
||||
#include <openssl/core_names.h>
|
||||
#include <openssl/params.h>
|
||||
#include "crypto/rsa.h"
|
||||
|
||||
/*
|
||||
* The intention with the "backend" source file is to offer backend support
|
||||
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
|
||||
* implementations alike.
|
||||
*/
|
||||
|
||||
DEFINE_STACK_OF(BIGNUM)
|
||||
|
||||
static int collect_numbers(STACK_OF(BIGNUM) *numbers,
|
||||
const OSSL_PARAM params[], const char *key)
|
||||
{
|
||||
const OSSL_PARAM *p = NULL;
|
||||
|
||||
if (numbers == NULL)
|
||||
return 0;
|
||||
|
||||
for (p = params; (p = OSSL_PARAM_locate_const(p, key)) != NULL; p++) {
|
||||
BIGNUM *tmp = NULL;
|
||||
|
||||
if (!OSSL_PARAM_get_BN(p, &tmp)
|
||||
|| sk_BIGNUM_push(numbers, tmp) == 0)
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
int rsa_fromdata(RSA *rsa, const OSSL_PARAM params[])
|
||||
{
|
||||
const OSSL_PARAM *param_n, *param_e, *param_d;
|
||||
BIGNUM *n = NULL, *e = NULL, *d = NULL;
|
||||
STACK_OF(BIGNUM) *factors = NULL, *exps = NULL, *coeffs = NULL;
|
||||
int is_private = 0;
|
||||
|
||||
if (rsa == NULL)
|
||||
return 0;
|
||||
|
||||
param_n = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_N);
|
||||
param_e = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_E);
|
||||
param_d = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_RSA_D);
|
||||
|
||||
if ((param_n != NULL && !OSSL_PARAM_get_BN(param_n, &n))
|
||||
|| (param_e != NULL && !OSSL_PARAM_get_BN(param_e, &e))
|
||||
|| (param_d != NULL && !OSSL_PARAM_get_BN(param_d, &d)))
|
||||
goto err;
|
||||
|
||||
is_private = (d != NULL);
|
||||
|
||||
if (!RSA_set0_key(rsa, n, e, d))
|
||||
goto err;
|
||||
n = e = d = NULL;
|
||||
|
||||
if (is_private) {
|
||||
if (!collect_numbers(factors = sk_BIGNUM_new_null(), params,
|
||||
OSSL_PKEY_PARAM_RSA_FACTOR)
|
||||
|| !collect_numbers(exps = sk_BIGNUM_new_null(), params,
|
||||
OSSL_PKEY_PARAM_RSA_EXPONENT)
|
||||
|| !collect_numbers(coeffs = sk_BIGNUM_new_null(), params,
|
||||
OSSL_PKEY_PARAM_RSA_COEFFICIENT))
|
||||
goto err;
|
||||
|
||||
/* It's ok if this private key just has n, e and d */
|
||||
if (sk_BIGNUM_num(factors) != 0
|
||||
&& !rsa_set0_all_params(rsa, factors, exps, coeffs))
|
||||
goto err;
|
||||
}
|
||||
|
||||
sk_BIGNUM_free(factors);
|
||||
sk_BIGNUM_free(exps);
|
||||
sk_BIGNUM_free(coeffs);
|
||||
return 1;
|
||||
|
||||
err:
|
||||
BN_free(n);
|
||||
BN_free(e);
|
||||
BN_free(d);
|
||||
sk_BIGNUM_pop_free(factors, BN_free);
|
||||
sk_BIGNUM_pop_free(exps, BN_free);
|
||||
sk_BIGNUM_pop_free(coeffs, BN_free);
|
||||
return 0;
|
||||
}
|
||||
|
||||