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-rw-r--r--examples/cred.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/examples/cred.c b/examples/cred.c
new file mode 100644
index 0000000..5a2a27f
--- /dev/null
+++ b/examples/cred.c
@@ -0,0 +1,331 @@
+/*
+ * Copyright (c) 2018-2023 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] [-c cred_protect] [-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, int cred_protect, 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);
+
+ /* credProt */
+ if (cred_protect != 0 && (r = fido_cred_set_prot(cred,
+ cred_protect)) != FIDO_OK)
+ errx(1, "fido_cred_set_prot: %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;
+ long long cred_protect = 0;
+
+ if ((cred = fido_cred_new()) == NULL)
+ errx(1, "fido_cred_new");
+
+ while ((ch = getopt(argc, argv, "P:T:b:e:hi:k:rt:uvc:")) != -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 'c':
+ if (base10(optarg, &cred_protect) < 0)
+ errx(1, "base10: %s", optarg);
+ if (cred_protect <= 0 || cred_protect > 3)
+ errx(1, "-c: %s must be in (1,3)", optarg);
+ ext |= FIDO_EXT_CRED_PROTECT;
+ 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);
+
+ /* credProt */
+ if (cred_protect != 0 && (r = fido_cred_set_prot(cred,
+ (int)cred_protect)) != FIDO_OK)
+ errx(1, "fido_cred_set_prot: %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, fido_cred_prot(cred),
+ 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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