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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 <errno.h>
#include <fido.h>
#include <stdbool.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 const unsigned char cd[32] = {
0xf9, 0x64, 0x57, 0xe7, 0x2d, 0x97, 0xf6, 0xbb,
0xdd, 0xd7, 0xfb, 0x06, 0x37, 0x62, 0xea, 0x26,
0x20, 0x44, 0x8e, 0x69, 0x7c, 0x03, 0xf2, 0x31,
0x2f, 0x99, 0xdc, 0xaf, 0x3e, 0x8a, 0x91, 0x6b,
};
static const unsigned char user_id[32] = {
0x78, 0x1c, 0x78, 0x60, 0xad, 0x88, 0xd2, 0x63,
0x32, 0x62, 0x2a, 0xf1, 0x74, 0x5d, 0xed, 0xb2,
0xe7, 0xa4, 0x2b, 0x44, 0x89, 0x29, 0x39, 0xc5,
0x56, 0x64, 0x01, 0x27, 0x0d, 0xbb, 0xc4, 0x49,
};
static void
usage(void)
{
fprintf(stderr, "usage: cred [-t es256|es384|rs256|eddsa] [-k pubkey] "
"[-ei cred_id] [-P pin] [-T seconds] [-b blobkey] [-hruv] "
"<device>\n");
exit(EXIT_FAILURE);
}
static void
verify_cred(int type, const char *fmt, const unsigned char *authdata_ptr,
size_t authdata_len, const unsigned char *attstmt_ptr, size_t attstmt_len,
bool rk, bool uv, int ext, const char *key_out, const char *id_out)
{
fido_cred_t *cred;
int r;
if ((cred = fido_cred_new()) == NULL)
errx(1, "fido_cred_new");
/* type */
r = fido_cred_set_type(cred, type);
if (r != FIDO_OK)
errx(1, "fido_cred_set_type: %s (0x%x)", fido_strerr(r), r);
/* client data */
r = fido_cred_set_clientdata(cred, cd, sizeof(cd));
if (r != FIDO_OK)
errx(1, "fido_cred_set_clientdata: %s (0x%x)", fido_strerr(r), r);
/* relying party */
r = fido_cred_set_rp(cred, "localhost", "sweet home localhost");
if (r != FIDO_OK)
errx(1, "fido_cred_set_rp: %s (0x%x)", fido_strerr(r), r);
/* authdata */
r = fido_cred_set_authdata(cred, authdata_ptr, authdata_len);
if (r != FIDO_OK)
errx(1, "fido_cred_set_authdata: %s (0x%x)", fido_strerr(r), r);
/* extensions */
r = fido_cred_set_extensions(cred, ext);
if (r != FIDO_OK)
errx(1, "fido_cred_set_extensions: %s (0x%x)", fido_strerr(r), r);
/* resident key */
if (rk && (r = fido_cred_set_rk(cred, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_cred_set_rk: %s (0x%x)", fido_strerr(r), r);
/* user verification */
if (uv && (r = fido_cred_set_uv(cred, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_cred_set_uv: %s (0x%x)", fido_strerr(r), r);
/* fmt */
r = fido_cred_set_fmt(cred, fmt);
if (r != FIDO_OK)
errx(1, "fido_cred_set_fmt: %s (0x%x)", fido_strerr(r), r);
if (!strcmp(fido_cred_fmt(cred), "none")) {
warnx("no attestation data, skipping credential verification");
goto out;
}
/* attestation statement */
r = fido_cred_set_attstmt(cred, attstmt_ptr, attstmt_len);
if (r != FIDO_OK)
errx(1, "fido_cred_set_attstmt: %s (0x%x)", fido_strerr(r), r);
r = fido_cred_verify(cred);
if (r != FIDO_OK)
errx(1, "fido_cred_verify: %s (0x%x)", fido_strerr(r), r);
out:
if (key_out != NULL) {
/* extract the credential pubkey */
if (type == COSE_ES256) {
if (write_es256_pubkey(key_out,
fido_cred_pubkey_ptr(cred),
fido_cred_pubkey_len(cred)) < 0)
errx(1, "write_es256_pubkey");
} else if (type == COSE_ES384) {
if (write_es384_pubkey(key_out,
fido_cred_pubkey_ptr(cred),
fido_cred_pubkey_len(cred)) < 0)
errx(1, "write_es384_pubkey");
} else if (type == COSE_RS256) {
if (write_rs256_pubkey(key_out,
fido_cred_pubkey_ptr(cred),
fido_cred_pubkey_len(cred)) < 0)
errx(1, "write_rs256_pubkey");
} else if (type == COSE_EDDSA) {
if (write_eddsa_pubkey(key_out,
fido_cred_pubkey_ptr(cred),
fido_cred_pubkey_len(cred)) < 0)
errx(1, "write_eddsa_pubkey");
}
}
if (id_out != NULL) {
/* extract the credential id */
if (write_blob(id_out, fido_cred_id_ptr(cred),
fido_cred_id_len(cred)) < 0)
errx(1, "write_blob");
}
fido_cred_free(&cred);
}
int
main(int argc, char **argv)
{
bool rk = false;
bool uv = false;
bool u2f = false;
fido_dev_t *dev;
fido_cred_t *cred = NULL;
const char *pin = NULL;
const char *blobkey_out = NULL;
const char *key_out = NULL;
const char *id_out = NULL;
unsigned char *body = NULL;
long long ms = 0;
size_t len;
int type = COSE_ES256;
int ext = 0;
int ch;
int r;
if ((cred = fido_cred_new()) == NULL)
errx(1, "fido_cred_new");
while ((ch = getopt(argc, argv, "P:T:b:e:hi:k:rt:uv")) != -1) {
switch (ch) {
case 'P':
pin = optarg;
break;
case 'T':
if (base10(optarg, &ms) < 0)
errx(1, "base10: %s", optarg);
if (ms <= 0 || ms > 30)
errx(1, "-T: %s must be in (0,30]", optarg);
ms *= 1000; /* seconds to milliseconds */
break;
case 'b':
ext |= FIDO_EXT_LARGEBLOB_KEY;
blobkey_out = optarg;
break;
case 'e':
if (read_blob(optarg, &body, &len) < 0)
errx(1, "read_blob: %s", optarg);
r = fido_cred_exclude(cred, body, len);
if (r != FIDO_OK)
errx(1, "fido_cred_exclude: %s (0x%x)",
fido_strerr(r), r);
free(body);
body = NULL;
break;
case 'h':
ext |= FIDO_EXT_HMAC_SECRET;
break;
case 'i':
id_out = optarg;
break;
case 'k':
key_out = optarg;
break;
case 'r':
rk = true;
break;
case 't':
if (strcmp(optarg, "es256") == 0)
type = COSE_ES256;
else if (strcmp(optarg, "es384") == 0)
type = COSE_ES384;
else if (strcmp(optarg, "rs256") == 0)
type = COSE_RS256;
else if (strcmp(optarg, "eddsa") == 0)
type = COSE_EDDSA;
else
errx(1, "unknown type %s", optarg);
break;
case 'u':
u2f = true;
break;
case 'v':
uv = true;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
fido_init(0);
if ((dev = fido_dev_new()) == NULL)
errx(1, "fido_dev_new");
r = fido_dev_open(dev, argv[0]);
if (r != FIDO_OK)
errx(1, "fido_dev_open: %s (0x%x)", fido_strerr(r), r);
if (u2f)
fido_dev_force_u2f(dev);
/* type */
r = fido_cred_set_type(cred, type);
if (r != FIDO_OK)
errx(1, "fido_cred_set_type: %s (0x%x)", fido_strerr(r), r);
/* client data */
r = fido_cred_set_clientdata(cred, cd, sizeof(cd));
if (r != FIDO_OK)
errx(1, "fido_cred_set_clientdata: %s (0x%x)", fido_strerr(r), r);
/* relying party */
r = fido_cred_set_rp(cred, "localhost", "sweet home localhost");
if (r != FIDO_OK)
errx(1, "fido_cred_set_rp: %s (0x%x)", fido_strerr(r), r);
/* user */
r = fido_cred_set_user(cred, user_id, sizeof(user_id), "john smith",
"jsmith", NULL);
if (r != FIDO_OK)
errx(1, "fido_cred_set_user: %s (0x%x)", fido_strerr(r), r);
/* extensions */
r = fido_cred_set_extensions(cred, ext);
if (r != FIDO_OK)
errx(1, "fido_cred_set_extensions: %s (0x%x)", fido_strerr(r), r);
/* resident key */
if (rk && (r = fido_cred_set_rk(cred, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_cred_set_rk: %s (0x%x)", fido_strerr(r), r);
/* user verification */
if (uv && (r = fido_cred_set_uv(cred, FIDO_OPT_TRUE)) != FIDO_OK)
errx(1, "fido_cred_set_uv: %s (0x%x)", fido_strerr(r), r);
/* timeout */
if (ms != 0 && (r = fido_dev_set_timeout(dev, (int)ms)) != FIDO_OK)
errx(1, "fido_dev_set_timeout: %s (0x%x)", fido_strerr(r), r);
if ((r = fido_dev_make_cred(dev, cred, pin)) != FIDO_OK) {
fido_dev_cancel(dev);
errx(1, "fido_makecred: %s (0x%x)", fido_strerr(r), r);
}
r = fido_dev_close(dev);
if (r != FIDO_OK)
errx(1, "fido_dev_close: %s (0x%x)", fido_strerr(r), r);
fido_dev_free(&dev);
/* when verifying, pin implies uv */
if (pin)
uv = true;
verify_cred(type, fido_cred_fmt(cred), fido_cred_authdata_ptr(cred),
fido_cred_authdata_len(cred), fido_cred_attstmt_ptr(cred),
fido_cred_attstmt_len(cred), rk, uv, ext, key_out, id_out);
if (blobkey_out != NULL) {
/* extract the "largeBlob" key */
if (write_blob(blobkey_out, fido_cred_largeblob_key_ptr(cred),
fido_cred_largeblob_key_len(cred)) < 0)
errx(1, "write_blob");
}
fido_cred_free(&cred);
exit(0);
}
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