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Diffstat (limited to '')
| -rw-r--r-- | tools/cred_make.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/tools/cred_make.c b/tools/cred_make.c new file mode 100644 index 0000000..a6239ec --- /dev/null +++ b/tools/cred_make.c @@ -0,0 +1,247 @@ +/* + * Copyright (c) 2018 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 <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_cred_t * +prepare_cred(FILE *in_f, int type, int flags) +{ + fido_cred_t *cred = NULL; + struct blob cdh; + struct blob uid; + char *rpid = NULL; + char *uname = NULL; + int r; + + memset(&cdh, 0, sizeof(cdh)); + memset(&uid, 0, sizeof(uid)); + + r = base64_read(in_f, &cdh); + r |= string_read(in_f, &rpid); + r |= string_read(in_f, &uname); + r |= base64_read(in_f, &uid); + 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, "user name: %s\n", uname); + fprintf(stderr, "user id:\n"); + xxd(uid.ptr, uid.len); + } + + if ((cred = fido_cred_new()) == NULL) + errx(1, "fido_cred_new"); + + if ((r = fido_cred_set_type(cred, type)) != FIDO_OK || + (r = fido_cred_set_clientdata_hash(cred, cdh.ptr, + cdh.len)) != FIDO_OK || + (r = fido_cred_set_rp(cred, rpid, NULL)) != FIDO_OK || + (r = fido_cred_set_user(cred, uid.ptr, uid.len, uname, NULL, + NULL)) != FIDO_OK) + errx(1, "fido_cred_set: %s", fido_strerr(r)); + + if (flags & FLAG_RK) { + if ((r = fido_cred_set_rk(cred, FIDO_OPT_TRUE)) != FIDO_OK) + errx(1, "fido_cred_set_rk: %s", fido_strerr(r)); + } + if (flags & FLAG_UV) { + if ((r = fido_cred_set_uv(cred, FIDO_OPT_TRUE)) != FIDO_OK) + errx(1, "fido_cred_set_uv: %s", fido_strerr(r)); + } + if (flags & FLAG_HMAC) { + if ((r = fido_cred_set_extensions(cred, + FIDO_EXT_HMAC_SECRET)) != FIDO_OK) + errx(1, "fido_cred_set_extensions: %s", fido_strerr(r)); + } + if (flags & FLAG_LARGEBLOB) { + if ((r = fido_cred_set_extensions(cred, + FIDO_EXT_LARGEBLOB_KEY)) != FIDO_OK) + errx(1, "fido_cred_set_extensions: %s", fido_strerr(r)); + } + + free(cdh.ptr); + free(uid.ptr); + free(rpid); + free(uname); + + return (cred); +} + +static void +print_attcred(FILE *out_f, const fido_cred_t *cred) +{ + char *cdh = NULL; + char *authdata = NULL; + char *id = NULL; + char *sig = NULL; + char *x5c = NULL; + char *key = NULL; + int r; + + r = base64_encode(fido_cred_clientdata_hash_ptr(cred), + fido_cred_clientdata_hash_len(cred), &cdh); + r |= base64_encode(fido_cred_authdata_ptr(cred), + fido_cred_authdata_len(cred), &authdata); + r |= base64_encode(fido_cred_id_ptr(cred), fido_cred_id_len(cred), + &id); + r |= base64_encode(fido_cred_sig_ptr(cred), fido_cred_sig_len(cred), + &sig); + if (fido_cred_x5c_ptr(cred) != NULL) + r |= base64_encode(fido_cred_x5c_ptr(cred), + fido_cred_x5c_len(cred), &x5c); + if (fido_cred_largeblob_key_ptr(cred) != NULL) + r |= base64_encode(fido_cred_largeblob_key_ptr(cred), + fido_cred_largeblob_key_len(cred), &key); + if (r < 0) + errx(1, "output error"); + + fprintf(out_f, "%s\n", cdh); + fprintf(out_f, "%s\n", fido_cred_rp_id(cred)); + fprintf(out_f, "%s\n", fido_cred_fmt(cred)); + fprintf(out_f, "%s\n", authdata); + fprintf(out_f, "%s\n", id); + fprintf(out_f, "%s\n", sig); + if (x5c != NULL) + fprintf(out_f, "%s\n", x5c); + if (key != NULL) { + fprintf(out_f, "%s\n", key); + explicit_bzero(key, strlen(key)); + } + + free(cdh); + free(authdata); + free(id); + free(sig); + free(x5c); + free(key); +} + +int +cred_make(int argc, char **argv) +{ + fido_dev_t *dev = NULL; + fido_cred_t *cred = NULL; + char prompt[1024]; + char pin[128]; + char *in_path = NULL; + char *out_path = NULL; + FILE *in_f = NULL; + FILE *out_f = NULL; + int type = COSE_ES256; + int flags = 0; + int cred_protect = -1; + int ch; + int r; + + while ((ch = getopt(argc, argv, "bc:dhi:o:qruv")) != -1) { + switch (ch) { + case 'b': + flags |= FLAG_LARGEBLOB; + break; + case 'c': + if ((cred_protect = base10(optarg)) < 0) + errx(1, "-c: invalid argument '%s'", optarg); + break; + case 'd': + flags |= FLAG_DEBUG; + break; + case 'h': + flags |= FLAG_HMAC; + break; + case 'i': + in_path = optarg; + break; + case 'o': + out_path = optarg; + break; + case 'q': + flags |= FLAG_QUIET; + break; + case 'r': + flags |= FLAG_RK; + break; + case 'u': + flags |= FLAG_U2F; + 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); + out_f = open_write(out_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); + + cred = prepare_cred(in_f, type, flags); + + dev = open_dev(argv[0]); + if (flags & FLAG_U2F) + fido_dev_force_u2f(dev); + + if (cred_protect > 0) { + r = fido_cred_set_prot(cred, cred_protect); + if (r != FIDO_OK) { + errx(1, "fido_cred_set_prot: %s", fido_strerr(r)); + } + } + + r = fido_dev_make_cred(dev, cred, NULL); + if (r == FIDO_ERR_PIN_REQUIRED && !(flags & FLAG_QUIET)) { + r = snprintf(prompt, sizeof(prompt), "Enter PIN for %s: ", + argv[0]); + if (r < 0 || (size_t)r >= sizeof(prompt)) + errx(1, "snprintf"); + if (!readpassphrase(prompt, pin, sizeof(pin), RPP_ECHO_OFF)) + errx(1, "readpassphrase"); + if (strlen(pin) < 4 || strlen(pin) > 63) { + explicit_bzero(pin, sizeof(pin)); + errx(1, "invalid PIN length"); + } + r = fido_dev_make_cred(dev, cred, pin); + } + + explicit_bzero(pin, sizeof(pin)); + if (r != FIDO_OK) + errx(1, "fido_dev_make_cred: %s", fido_strerr(r)); + print_attcred(out_f, cred); + + fido_dev_close(dev); + fido_dev_free(&dev); + fido_cred_free(&cred); + + fclose(in_f); + fclose(out_f); + in_f = NULL; + out_f = NULL; + + exit(0); +} |