Coverage Report

Created: 2020-09-01 07:05

/libfido2/src/eddsa.c
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Source (jump to first uncovered line)
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/*
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 * Copyright (c) 2019 Yubico AB. All rights reserved.
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 * Use of this source code is governed by a BSD-style
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 * license that can be found in the LICENSE file.
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 */
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#include <openssl/bn.h>
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#include <openssl/ec.h>
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#include <openssl/evp.h>
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#include <openssl/obj_mac.h>
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#include <string.h>
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#include "fido.h"
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#include "fido/eddsa.h"
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#if defined(LIBRESSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x10101000L
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EVP_PKEY *
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EVP_PKEY_new_raw_public_key(int type, ENGINE *e, const unsigned char *key,
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    size_t keylen)
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{
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        (void)type;
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        (void)e;
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        (void)key;
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        (void)keylen;
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        fido_log_debug("%s: unimplemented", __func__);
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        return (NULL);
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}
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int
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EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub,
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    size_t *len)
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{
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        (void)pkey;
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        (void)pub;
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        (void)len;
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        fido_log_debug("%s: unimplemented", __func__);
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        return (0);
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}
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int
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EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, size_t siglen,
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    const unsigned char *tbs, size_t tbslen)
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{
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        (void)ctx;
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        (void)sigret;
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        (void)siglen;
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        (void)tbs;
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        (void)tbslen;
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        fido_log_debug("%s: unimplemented", __func__);
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        return (0);
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}
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#endif /* LIBRESSL_VERSION_NUMBER || OPENSSL_VERSION_NUMBER < 0x10101000L */
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_MD_CTX *
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EVP_MD_CTX_new(void)
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{
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        fido_log_debug("%s: unimplemented", __func__);
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        return (NULL);
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}
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void
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EVP_MD_CTX_free(EVP_MD_CTX *ctx)
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{
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        (void)ctx;
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}
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#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
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static int
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decode_coord(const cbor_item_t *item, void *xy, size_t xy_len)
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{
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        if (cbor_isa_bytestring(item) == false ||
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            cbor_bytestring_is_definite(item) == false ||
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            cbor_bytestring_length(item) != xy_len) {
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                fido_log_debug("%s: cbor type", __func__);
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                return (-1);
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        }
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        memcpy(xy, cbor_bytestring_handle(item), xy_len);
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        return (0);
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}
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static int
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decode_pubkey_point(const cbor_item_t *key, const cbor_item_t *val, void *arg)
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{
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        eddsa_pk_t *k = arg;
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        if (cbor_isa_negint(key) == false ||
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            cbor_int_get_width(key) != CBOR_INT_8)
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                return (0); /* ignore */
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        switch (cbor_get_uint8(key)) {
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        case 1: /* x coordinate */
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                return (decode_coord(val, &k->x, sizeof(k->x)));
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        }
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        return (0); /* ignore */
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}
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int
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eddsa_pk_decode(const cbor_item_t *item, eddsa_pk_t *k)
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{
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        if (cbor_isa_map(item) == false ||
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            cbor_map_is_definite(item) == false ||
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            cbor_map_iter(item, k, decode_pubkey_point) < 0) {
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                fido_log_debug("%s: cbor type", __func__);
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                return (-1);
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        }
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        return (0);
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}
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eddsa_pk_t *
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eddsa_pk_new(void)
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1.09k
{
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1.09k
        return (calloc(1, sizeof(eddsa_pk_t)));
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}
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void
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eddsa_pk_free(eddsa_pk_t **pkp)
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2.00k
{
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2.00k
        eddsa_pk_t *pk;
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2.00k
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        if (pkp == NULL || (pk = *pkp) == NULL)
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                return;
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1.08k
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1.08k
        explicit_bzero(pk, sizeof(*pk));
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1.08k
        free(pk);
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1.08k
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        *pkp = NULL;
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}
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int
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eddsa_pk_from_ptr(eddsa_pk_t *pk, const void *ptr, size_t len)
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{
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        if (len < sizeof(*pk))
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                return (FIDO_ERR_INVALID_ARGUMENT);
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        memcpy(pk, ptr, sizeof(*pk));
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        return (FIDO_OK);
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}
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EVP_PKEY *
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eddsa_pk_to_EVP_PKEY(const eddsa_pk_t *k)
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{
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        EVP_PKEY *pkey = NULL;
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        if ((pkey = EVP_PKEY_new_raw_public_key(EVP_PKEY_ED25519, NULL, k->x,
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            sizeof(k->x))) == NULL)
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                fido_log_debug("%s: EVP_PKEY_new_raw_public_key", __func__);
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        return (pkey);
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}
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int
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eddsa_pk_from_EVP_PKEY(eddsa_pk_t *pk, const EVP_PKEY *pkey)
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{
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        size_t len = 0;
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        if (EVP_PKEY_get_raw_public_key(pkey, NULL, &len) != 1 ||
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            len != sizeof(pk->x))
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                return (FIDO_ERR_INTERNAL);
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        if (EVP_PKEY_get_raw_public_key(pkey, pk->x, &len) != 1 ||
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            len != sizeof(pk->x))
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                return (FIDO_ERR_INTERNAL);
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        return (FIDO_OK);
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}