0afa8e065e
git-subtree-dir: contrib/libfido2 git-subtree-mainline:d586c978b9
git-subtree-split:a58dee945a
317 lines
7.1 KiB
C
317 lines
7.1 KiB
C
/*
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* Copyright (c) 2018 Yubico AB. All rights reserved.
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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 <fido.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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struct toggle {
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fido_opt_t up;
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fido_opt_t uv;
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fido_opt_t pin;
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};
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static const char *
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opt2str(fido_opt_t v)
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{
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switch (v) {
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case FIDO_OPT_OMIT:
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return "omit";
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case FIDO_OPT_TRUE:
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return "true";
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case FIDO_OPT_FALSE:
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return "false";
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default:
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return "unknown";
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}
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}
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static void
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parse_toggle(const char *str, struct toggle *opt)
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{
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fido_opt_t *k;
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fido_opt_t v;
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char *assignment;
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char *key;
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char *val;
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if ((assignment = strdup(str)) == NULL)
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err(1, "strdup");
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if ((val = strchr(assignment, '=')) == NULL)
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errx(1, "invalid assignment '%s'", assignment);
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key = assignment;
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*val++ = '\0';
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if (!strcmp(val, "true"))
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v = FIDO_OPT_TRUE;
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else if (!strcmp(val, "false"))
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v = FIDO_OPT_FALSE;
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else
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errx(1, "unknown value '%s'", val);
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if (!strcmp(key, "up"))
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k = &opt->up;
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else if (!strcmp(key, "uv"))
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k = &opt->uv;
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else if (!strcmp(key, "pin"))
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k = &opt->pin;
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else
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errx(1, "unknown key '%s'", key);
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free(assignment);
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*k = v;
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}
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static fido_assert_t *
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prepare_assert(FILE *in_f, int flags, const struct toggle *opt)
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{
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fido_assert_t *assert = NULL;
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struct blob cdh;
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struct blob id;
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struct blob hmac_salt;
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char *rpid = NULL;
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int r;
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memset(&cdh, 0, sizeof(cdh));
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memset(&id, 0, sizeof(id));
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memset(&hmac_salt, 0, sizeof(hmac_salt));
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r = base64_read(in_f, &cdh);
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r |= string_read(in_f, &rpid);
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if ((flags & FLAG_RK) == 0)
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r |= base64_read(in_f, &id);
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if (flags & FLAG_HMAC)
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r |= base64_read(in_f, &hmac_salt);
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if (r < 0)
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errx(1, "input error");
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if (flags & FLAG_DEBUG) {
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fprintf(stderr, "client data hash:\n");
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xxd(cdh.ptr, cdh.len);
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fprintf(stderr, "relying party id: %s\n", rpid);
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if ((flags & FLAG_RK) == 0) {
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fprintf(stderr, "credential id:\n");
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xxd(id.ptr, id.len);
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}
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fprintf(stderr, "up=%s\n", opt2str(opt->up));
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fprintf(stderr, "uv=%s\n", opt2str(opt->uv));
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fprintf(stderr, "pin=%s\n", opt2str(opt->pin));
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}
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if ((assert = fido_assert_new()) == NULL)
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errx(1, "fido_assert_new");
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if ((r = fido_assert_set_clientdata_hash(assert, cdh.ptr,
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cdh.len)) != FIDO_OK ||
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(r = fido_assert_set_rp(assert, rpid)) != FIDO_OK)
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errx(1, "fido_assert_set: %s", fido_strerr(r));
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if ((r = fido_assert_set_up(assert, opt->up)) != FIDO_OK)
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errx(1, "fido_assert_set_up: %s", fido_strerr(r));
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if ((r = fido_assert_set_uv(assert, opt->uv)) != FIDO_OK)
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errx(1, "fido_assert_set_uv: %s", fido_strerr(r));
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if (flags & FLAG_HMAC) {
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if ((r = fido_assert_set_extensions(assert,
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FIDO_EXT_HMAC_SECRET)) != FIDO_OK)
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errx(1, "fido_assert_set_extensions: %s",
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fido_strerr(r));
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if ((r = fido_assert_set_hmac_salt(assert, hmac_salt.ptr,
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hmac_salt.len)) != FIDO_OK)
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errx(1, "fido_assert_set_hmac_salt: %s",
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fido_strerr(r));
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}
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if (flags & FLAG_LARGEBLOB) {
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if ((r = fido_assert_set_extensions(assert,
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FIDO_EXT_LARGEBLOB_KEY)) != FIDO_OK)
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errx(1, "fido_assert_set_extensions: %s", fido_strerr(r));
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}
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if ((flags & FLAG_RK) == 0) {
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if ((r = fido_assert_allow_cred(assert, id.ptr,
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id.len)) != FIDO_OK)
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errx(1, "fido_assert_allow_cred: %s", fido_strerr(r));
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}
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free(hmac_salt.ptr);
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free(cdh.ptr);
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free(id.ptr);
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free(rpid);
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return (assert);
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}
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static void
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print_assert(FILE *out_f, const fido_assert_t *assert, size_t idx, int flags)
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{
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char *cdh = NULL;
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char *authdata = NULL;
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char *sig = NULL;
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char *user_id = NULL;
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char *hmac_secret = NULL;
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char *key = NULL;
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int r;
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r = base64_encode(fido_assert_clientdata_hash_ptr(assert),
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fido_assert_clientdata_hash_len(assert), &cdh);
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r |= base64_encode(fido_assert_authdata_ptr(assert, idx),
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fido_assert_authdata_len(assert, 0), &authdata);
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r |= base64_encode(fido_assert_sig_ptr(assert, idx),
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fido_assert_sig_len(assert, idx), &sig);
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if (flags & FLAG_RK)
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r |= base64_encode(fido_assert_user_id_ptr(assert, idx),
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fido_assert_user_id_len(assert, idx), &user_id);
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if (flags & FLAG_HMAC)
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r |= base64_encode(fido_assert_hmac_secret_ptr(assert, idx),
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fido_assert_hmac_secret_len(assert, idx), &hmac_secret);
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if (flags & FLAG_LARGEBLOB)
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r |= base64_encode(fido_assert_largeblob_key_ptr(assert, idx),
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fido_assert_largeblob_key_len(assert, idx), &key);
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if (r < 0)
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errx(1, "output error");
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fprintf(out_f, "%s\n", cdh);
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fprintf(out_f, "%s\n", fido_assert_rp_id(assert));
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fprintf(out_f, "%s\n", authdata);
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fprintf(out_f, "%s\n", sig);
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if (flags & FLAG_RK)
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fprintf(out_f, "%s\n", user_id);
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if (hmac_secret) {
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fprintf(out_f, "%s\n", hmac_secret);
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explicit_bzero(hmac_secret, strlen(hmac_secret));
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}
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if (key) {
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fprintf(out_f, "%s\n", key);
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explicit_bzero(key, strlen(key));
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}
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free(key);
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free(hmac_secret);
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free(cdh);
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free(authdata);
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free(sig);
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free(user_id);
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}
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int
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assert_get(int argc, char **argv)
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{
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fido_dev_t *dev = NULL;
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fido_assert_t *assert = NULL;
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struct toggle opt;
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char pin[1024];
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char prompt[1024];
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char *in_path = NULL;
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char *out_path = NULL;
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FILE *in_f = NULL;
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FILE *out_f = NULL;
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int flags = 0;
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int ch;
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int r;
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opt.up = opt.uv = opt.pin = FIDO_OPT_OMIT;
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while ((ch = getopt(argc, argv, "bdhi:o:prt:uv")) != -1) {
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switch (ch) {
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case 'b':
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flags |= FLAG_LARGEBLOB;
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break;
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case 'd':
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flags |= FLAG_DEBUG;
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break;
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case 'h':
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flags |= FLAG_HMAC;
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break;
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case 'i':
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in_path = optarg;
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break;
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case 'o':
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out_path = optarg;
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break;
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case 'p':
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opt.up = FIDO_OPT_TRUE;
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break;
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case 'r':
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flags |= FLAG_RK;
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break;
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case 't' :
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parse_toggle(optarg, &opt);
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break;
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case 'u':
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flags |= FLAG_U2F;
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break;
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case 'v':
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/* -v implies both pin and uv for historical reasons */
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opt.pin = FIDO_OPT_TRUE;
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opt.uv = FIDO_OPT_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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if (argc < 1)
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usage();
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in_f = open_read(in_path);
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out_f = open_write(out_path);
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fido_init((flags & FLAG_DEBUG) ? FIDO_DEBUG : 0);
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assert = prepare_assert(in_f, flags, &opt);
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dev = open_dev(argv[0]);
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if (flags & FLAG_U2F)
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fido_dev_force_u2f(dev);
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if (opt.pin == FIDO_OPT_TRUE) {
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r = snprintf(prompt, sizeof(prompt), "Enter PIN for %s: ",
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argv[0]);
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if (r < 0 || (size_t)r >= sizeof(prompt))
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errx(1, "snprintf");
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if (!readpassphrase(prompt, pin, sizeof(pin), RPP_ECHO_OFF))
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errx(1, "readpassphrase");
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r = fido_dev_get_assert(dev, assert, pin);
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} else
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r = fido_dev_get_assert(dev, assert, NULL);
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explicit_bzero(pin, sizeof(pin));
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if (r != FIDO_OK)
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errx(1, "fido_dev_get_assert: %s", fido_strerr(r));
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if (flags & FLAG_RK) {
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for (size_t idx = 0; idx < fido_assert_count(assert); idx++)
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print_assert(out_f, assert, idx, flags);
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} else {
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if (fido_assert_count(assert) != 1)
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errx(1, "fido_assert_count: %zu",
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fido_assert_count(assert));
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print_assert(out_f, assert, 0, flags);
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}
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fido_dev_close(dev);
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fido_dev_free(&dev);
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fido_assert_free(&assert);
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fclose(in_f);
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fclose(out_f);
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in_f = NULL;
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out_f = NULL;
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exit(0);
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}
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