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/*
* Copyright (c) 2018-2022 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <fido.h>
#include <fido/es256.h>
#include <fido/es384.h>
#include <fido/rs256.h>
#include <fido/eddsa.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "../openbsd-compat/openbsd-compat.h"
#include "extern.h"
static fido_assert_t *
prepare_assert(FILE *in_f, int flags)
{
fido_assert_t *assert = NULL;
struct blob cdh;
struct blob authdata;
struct blob sig;
char *rpid = NULL;
int r;
memset(&cdh, 0, sizeof(cdh));
memset(&authdata, 0, sizeof(authdata));
memset(&sig, 0, sizeof(sig));
r = base64_read(in_f, &cdh);
r |= string_read(in_f, &rpid);
r |= base64_read(in_f, &authdata);
r |= base64_read(in_f, &sig);
if (r < 0)
errx(1, "input error");
if (flags & FLAG_DEBUG) {
fprintf(stderr, "client data hash:\n");
xxd(cdh.ptr, cdh.len);
fprintf(stderr, "relying party id: %s\n", rpid);
fprintf(stderr, "authenticator data:\n");
xxd(authdata.ptr, authdata.len);
fprintf(stderr, "signature:\n");
xxd(sig.ptr, sig.len);
}
if ((assert = fido_assert_new()) == NULL)
errx(1, "fido_assert_new");
if ((r = fido_assert_set_count(assert, 1)) != FIDO_OK)
errx(1, "fido_assert_count: %s", fido_strerr(r));
if ((r = fido_assert_set_clientdata_hash(assert, cdh.ptr,
cdh.len)) != FIDO_OK ||
(r = fido_assert_set_rp(assert, rpid)) != FIDO_OK ||
(r = fido_assert_set_authdata(assert, 0, authdata.ptr,
authdata.len)) != FIDO_OK ||
(r = fido_assert_set_sig(assert, 0, sig.ptr, sig.len)) != FIDO_OK)
errx(1, "fido_assert_set: %s", fido_strerr(r));
if (flags & FLAG_UP) {
if ((r = fido_assert_set_up(assert, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_assert_set_up: %s", fido_strerr(r));
}
if (flags & FLAG_UV) {
if ((r = fido_assert_set_uv(assert, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_assert_set_uv: %s", fido_strerr(r));
}
if (flags & FLAG_HMAC) {
if ((r = fido_assert_set_extensions(assert,
FIDO_EXT_HMAC_SECRET)) != FIDO_OK)
errx(1, "fido_assert_set_extensions: %s",
fido_strerr(r));
}
free(cdh.ptr);
free(authdata.ptr);
free(sig.ptr);
free(rpid);
return (assert);
}
static void *
load_pubkey(int type, const char *file)
{
EC_KEY *ec = NULL;
RSA *rsa = NULL;
EVP_PKEY *eddsa = NULL;
es256_pk_t *es256_pk = NULL;
es384_pk_t *es384_pk = NULL;
rs256_pk_t *rs256_pk = NULL;
eddsa_pk_t *eddsa_pk = NULL;
void *pk = NULL;
switch (type) {
case COSE_ES256:
if ((ec = read_ec_pubkey(file)) == NULL)
errx(1, "read_ec_pubkey");
if ((es256_pk = es256_pk_new()) == NULL)
errx(1, "es256_pk_new");
if (es256_pk_from_EC_KEY(es256_pk, ec) != FIDO_OK)
errx(1, "es256_pk_from_EC_KEY");
pk = es256_pk;
EC_KEY_free(ec);
break;
case COSE_ES384:
if ((ec = read_ec_pubkey(file)) == NULL)
errx(1, "read_ec_pubkey");
if ((es384_pk = es384_pk_new()) == NULL)
errx(1, "es384_pk_new");
if (es384_pk_from_EC_KEY(es384_pk, ec) != FIDO_OK)
errx(1, "es384_pk_from_EC_KEY");
pk = es384_pk;
EC_KEY_free(ec);
break;
case COSE_RS256:
if ((rsa = read_rsa_pubkey(file)) == NULL)
errx(1, "read_rsa_pubkey");
if ((rs256_pk = rs256_pk_new()) == NULL)
errx(1, "rs256_pk_new");
if (rs256_pk_from_RSA(rs256_pk, rsa) != FIDO_OK)
errx(1, "rs256_pk_from_RSA");
pk = rs256_pk;
RSA_free(rsa);
break;
case COSE_EDDSA:
if ((eddsa = read_eddsa_pubkey(file)) == NULL)
errx(1, "read_eddsa_pubkey");
if ((eddsa_pk = eddsa_pk_new()) == NULL)
errx(1, "eddsa_pk_new");
if (eddsa_pk_from_EVP_PKEY(eddsa_pk, eddsa) != FIDO_OK)
errx(1, "eddsa_pk_from_EVP_PKEY");
pk = eddsa_pk;
EVP_PKEY_free(eddsa);
break;
default:
errx(1, "invalid type %d", type);
}
return (pk);
}
int
assert_verify(int argc, char **argv)
{
fido_assert_t *assert = NULL;
void *pk = NULL;
char *in_path = NULL;
FILE *in_f = NULL;
int type = COSE_ES256;
int flags = 0;
int ch;
int r;
while ((ch = getopt(argc, argv, "dhi:pv")) != -1) {
switch (ch) {
case 'd':
flags |= FLAG_DEBUG;
break;
case 'h':
flags |= FLAG_HMAC;
break;
case 'i':
in_path = optarg;
break;
case 'p':
flags |= FLAG_UP;
break;
case 'v':
flags |= FLAG_UV;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 1 || argc > 2)
usage();
in_f = open_read(in_path);
if (argc > 1 && cose_type(argv[1], &type) < 0)
errx(1, "unknown type %s", argv[1]);
fido_init((flags & FLAG_DEBUG) ? FIDO_DEBUG : 0);
pk = load_pubkey(type, argv[0]);
assert = prepare_assert(in_f, flags);
if ((r = fido_assert_verify(assert, 0, type, pk)) != FIDO_OK)
errx(1, "fido_assert_verify: %s", fido_strerr(r));
fido_assert_free(&assert);
fclose(in_f);
in_f = NULL;
exit(0);
}
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