2021-10-01 23:52:55 +00:00
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/*
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2023-04-26 16:37:20 +00:00
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* Copyright (c) 2018-2021 Yubico AB. All rights reserved.
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2021-10-01 23:52:55 +00:00
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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 <errno.h>
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#include <fido.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "../openbsd-compat/openbsd-compat.h"
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#include "extern.h"
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2023-04-26 16:37:20 +00:00
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static const unsigned char cd[32] = {
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2021-10-01 23:52:55 +00:00
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0xf9, 0x64, 0x57, 0xe7, 0x2d, 0x97, 0xf6, 0xbb,
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0xdd, 0xd7, 0xfb, 0x06, 0x37, 0x62, 0xea, 0x26,
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0x20, 0x44, 0x8e, 0x69, 0x7c, 0x03, 0xf2, 0x31,
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0x2f, 0x99, 0xdc, 0xaf, 0x3e, 0x8a, 0x91, 0x6b,
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};
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static const unsigned char user_id[32] = {
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0x78, 0x1c, 0x78, 0x60, 0xad, 0x88, 0xd2, 0x63,
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0x32, 0x62, 0x2a, 0xf1, 0x74, 0x5d, 0xed, 0xb2,
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0xe7, 0xa4, 0x2b, 0x44, 0x89, 0x29, 0x39, 0xc5,
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0x56, 0x64, 0x01, 0x27, 0x0d, 0xbb, 0xc4, 0x49,
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};
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static void
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usage(void)
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{
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fprintf(stderr, "usage: cred [-t ecdsa|rsa|eddsa] [-k pubkey] "
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"[-ei cred_id] [-P pin] [-T seconds] [-b blobkey] [-hruv] "
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"<device>\n");
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exit(EXIT_FAILURE);
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}
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static void
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verify_cred(int type, const char *fmt, const unsigned char *authdata_ptr,
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2023-04-26 16:37:20 +00:00
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size_t authdata_len, const unsigned char *attstmt_ptr, size_t attstmt_len,
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bool rk, bool uv, int ext, const char *key_out, const char *id_out)
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2021-10-01 23:52:55 +00:00
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{
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fido_cred_t *cred;
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int r;
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if ((cred = fido_cred_new()) == NULL)
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errx(1, "fido_cred_new");
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/* type */
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r = fido_cred_set_type(cred, type);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_type: %s (0x%x)", fido_strerr(r), r);
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2023-04-26 16:37:20 +00:00
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/* client data */
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r = fido_cred_set_clientdata(cred, cd, sizeof(cd));
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2021-10-01 23:52:55 +00:00
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if (r != FIDO_OK)
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2023-04-26 16:37:20 +00:00
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errx(1, "fido_cred_set_clientdata: %s (0x%x)", fido_strerr(r), r);
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2021-10-01 23:52:55 +00:00
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/* relying party */
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r = fido_cred_set_rp(cred, "localhost", "sweet home localhost");
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_rp: %s (0x%x)", fido_strerr(r), r);
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/* authdata */
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r = fido_cred_set_authdata(cred, authdata_ptr, authdata_len);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_authdata: %s (0x%x)", fido_strerr(r), r);
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/* extensions */
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r = fido_cred_set_extensions(cred, ext);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_extensions: %s (0x%x)", fido_strerr(r), r);
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/* resident key */
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if (rk && (r = fido_cred_set_rk(cred, FIDO_OPT_TRUE)) != FIDO_OK)
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errx(1, "fido_cred_set_rk: %s (0x%x)", fido_strerr(r), r);
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/* user verification */
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if (uv && (r = fido_cred_set_uv(cred, FIDO_OPT_TRUE)) != FIDO_OK)
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errx(1, "fido_cred_set_uv: %s (0x%x)", fido_strerr(r), r);
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/* fmt */
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r = fido_cred_set_fmt(cred, fmt);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_fmt: %s (0x%x)", fido_strerr(r), r);
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if (!strcmp(fido_cred_fmt(cred), "none")) {
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warnx("no attestation data, skipping credential verification");
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goto out;
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}
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2023-04-26 16:37:20 +00:00
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/* attestation statement */
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r = fido_cred_set_attstmt(cred, attstmt_ptr, attstmt_len);
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2021-10-01 23:52:55 +00:00
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if (r != FIDO_OK)
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2023-04-26 16:37:20 +00:00
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errx(1, "fido_cred_set_attstmt: %s (0x%x)", fido_strerr(r), r);
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2021-10-01 23:52:55 +00:00
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r = fido_cred_verify(cred);
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if (r != FIDO_OK)
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errx(1, "fido_cred_verify: %s (0x%x)", fido_strerr(r), r);
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out:
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if (key_out != NULL) {
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/* extract the credential pubkey */
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if (type == COSE_ES256) {
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if (write_ec_pubkey(key_out, fido_cred_pubkey_ptr(cred),
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fido_cred_pubkey_len(cred)) < 0)
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errx(1, "write_ec_pubkey");
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} else if (type == COSE_RS256) {
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if (write_rsa_pubkey(key_out, fido_cred_pubkey_ptr(cred),
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fido_cred_pubkey_len(cred)) < 0)
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errx(1, "write_rsa_pubkey");
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} else if (type == COSE_EDDSA) {
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if (write_eddsa_pubkey(key_out, fido_cred_pubkey_ptr(cred),
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fido_cred_pubkey_len(cred)) < 0)
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errx(1, "write_eddsa_pubkey");
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}
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}
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if (id_out != NULL) {
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/* extract the credential id */
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if (write_blob(id_out, fido_cred_id_ptr(cred),
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fido_cred_id_len(cred)) < 0)
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errx(1, "write_blob");
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}
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fido_cred_free(&cred);
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}
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int
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main(int argc, char **argv)
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{
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bool rk = false;
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bool uv = false;
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bool u2f = false;
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fido_dev_t *dev;
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fido_cred_t *cred = NULL;
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const char *pin = NULL;
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const char *blobkey_out = NULL;
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const char *key_out = NULL;
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const char *id_out = NULL;
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unsigned char *body = NULL;
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2023-04-26 16:37:20 +00:00
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long long ms = 0;
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2021-10-01 23:52:55 +00:00
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size_t len;
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int type = COSE_ES256;
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int ext = 0;
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int ch;
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int r;
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if ((cred = fido_cred_new()) == NULL)
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errx(1, "fido_cred_new");
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while ((ch = getopt(argc, argv, "P:T:b:e:hi:k:rt:uv")) != -1) {
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switch (ch) {
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case 'P':
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pin = optarg;
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break;
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case 'T':
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2023-04-26 16:37:20 +00:00
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if (base10(optarg, &ms) < 0)
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2021-10-01 23:52:55 +00:00
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errx(1, "base10: %s", optarg);
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2023-04-26 16:37:20 +00:00
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if (ms <= 0 || ms > 30)
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2021-10-01 23:52:55 +00:00
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errx(1, "-T: %s must be in (0,30]", optarg);
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2023-04-26 16:37:20 +00:00
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ms *= 1000; /* seconds to milliseconds */
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2021-10-01 23:52:55 +00:00
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break;
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case 'b':
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ext |= FIDO_EXT_LARGEBLOB_KEY;
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blobkey_out = optarg;
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break;
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case 'e':
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if (read_blob(optarg, &body, &len) < 0)
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errx(1, "read_blob: %s", optarg);
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r = fido_cred_exclude(cred, body, len);
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if (r != FIDO_OK)
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errx(1, "fido_cred_exclude: %s (0x%x)",
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fido_strerr(r), r);
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free(body);
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body = NULL;
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break;
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case 'h':
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ext |= FIDO_EXT_HMAC_SECRET;
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break;
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case 'i':
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id_out = optarg;
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break;
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case 'k':
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key_out = optarg;
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break;
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case 'r':
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rk = true;
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break;
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case 't':
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if (strcmp(optarg, "ecdsa") == 0)
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type = COSE_ES256;
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else if (strcmp(optarg, "rsa") == 0)
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type = COSE_RS256;
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else if (strcmp(optarg, "eddsa") == 0)
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type = COSE_EDDSA;
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else
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errx(1, "unknown type %s", optarg);
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break;
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case 'u':
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u2f = true;
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break;
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case 'v':
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uv = true;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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2023-04-26 16:37:20 +00:00
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if (argc != 1)
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2021-10-01 23:52:55 +00:00
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usage();
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2023-04-26 16:37:20 +00:00
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fido_init(0);
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if ((dev = fido_dev_new()) == NULL)
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errx(1, "fido_dev_new");
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2021-10-01 23:52:55 +00:00
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2023-04-26 16:37:20 +00:00
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r = fido_dev_open(dev, argv[0]);
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if (r != FIDO_OK)
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errx(1, "fido_dev_open: %s (0x%x)", fido_strerr(r), r);
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2021-10-01 23:52:55 +00:00
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if (u2f)
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fido_dev_force_u2f(dev);
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/* type */
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r = fido_cred_set_type(cred, type);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_type: %s (0x%x)", fido_strerr(r), r);
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2023-04-26 16:37:20 +00:00
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/* client data */
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r = fido_cred_set_clientdata(cred, cd, sizeof(cd));
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2021-10-01 23:52:55 +00:00
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if (r != FIDO_OK)
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2023-04-26 16:37:20 +00:00
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errx(1, "fido_cred_set_clientdata: %s (0x%x)", fido_strerr(r), r);
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2021-10-01 23:52:55 +00:00
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/* relying party */
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r = fido_cred_set_rp(cred, "localhost", "sweet home localhost");
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_rp: %s (0x%x)", fido_strerr(r), r);
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/* user */
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r = fido_cred_set_user(cred, user_id, sizeof(user_id), "john smith",
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"jsmith", NULL);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_user: %s (0x%x)", fido_strerr(r), r);
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/* extensions */
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r = fido_cred_set_extensions(cred, ext);
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if (r != FIDO_OK)
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errx(1, "fido_cred_set_extensions: %s (0x%x)", fido_strerr(r), r);
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/* resident key */
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if (rk && (r = fido_cred_set_rk(cred, FIDO_OPT_TRUE)) != FIDO_OK)
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errx(1, "fido_cred_set_rk: %s (0x%x)", fido_strerr(r), r);
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/* user verification */
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if (uv && (r = fido_cred_set_uv(cred, FIDO_OPT_TRUE)) != FIDO_OK)
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errx(1, "fido_cred_set_uv: %s (0x%x)", fido_strerr(r), r);
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2023-04-26 16:37:20 +00:00
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/* timeout */
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if (ms != 0 && (r = fido_dev_set_timeout(dev, (int)ms)) != FIDO_OK)
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errx(1, "fido_dev_set_timeout: %s (0x%x)", fido_strerr(r), r);
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2021-10-01 23:52:55 +00:00
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2023-04-26 16:37:20 +00:00
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if ((r = fido_dev_make_cred(dev, cred, pin)) != FIDO_OK) {
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fido_dev_cancel(dev);
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2021-10-01 23:52:55 +00:00
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errx(1, "fido_makecred: %s (0x%x)", fido_strerr(r), r);
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}
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r = fido_dev_close(dev);
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if (r != FIDO_OK)
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errx(1, "fido_dev_close: %s (0x%x)", fido_strerr(r), r);
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fido_dev_free(&dev);
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/* when verifying, pin implies uv */
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if (pin)
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uv = true;
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verify_cred(type, fido_cred_fmt(cred), fido_cred_authdata_ptr(cred),
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2023-04-26 16:37:20 +00:00
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fido_cred_authdata_len(cred), fido_cred_attstmt_ptr(cred),
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fido_cred_attstmt_len(cred), rk, uv, ext, key_out, id_out);
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2021-10-01 23:52:55 +00:00
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if (blobkey_out != NULL) {
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/* extract the "largeBlob" key */
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if (write_blob(blobkey_out, fido_cred_largeblob_key_ptr(cred),
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fido_cred_largeblob_key_len(cred)) < 0)
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errx(1, "write_blob");
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}
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fido_cred_free(&cred);
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exit(0);
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}
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