Some highlights from NEWS: ** Added OpenSSL 3.0 compatibility. ** Removed OpenSSL 1.0 compatibility. ** Support for FIDO 2.1 "minPinLength" extension. ** Support for COSE_EDDSA, COSE_ES256, and COSE_RS1 attestation. ** Support for TPM 2.0 attestation. ** Support for device timeouts; see fido_dev_set_timeout(). ** New API calls: - es256_pk_from_EVP_PKEY; - fido_cred_attstmt_len; - fido_cred_attstmt_ptr; - fido_cred_pin_minlen; - fido_cred_set_attstmt; - fido_cred_set_pin_minlen; - fido_dev_set_pin_minlen_rpid; - fido_dev_set_timeout; - rs256_pk_from_EVP_PKEY. ** Reliability and portability fixes. ** Better handling of HID devices without identification strings; gh#381. Relnotes: Yes Sponsored by: The FreeBSD Foundation
272 lines
5.7 KiB
C
272 lines
5.7 KiB
C
/*
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* Copyright (c) 2020 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 <assert.h>
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#include <stdint.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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#include "mutator_aux.h"
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#include "wiredata_fido2.h"
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#include "dummy.h"
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#include "../openbsd-compat/openbsd-compat.h"
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/* Parameter set defining a FIDO2 "large blob" operation. */
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struct param {
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char pin[MAXSTR];
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int seed;
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struct blob key;
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struct blob get_wiredata;
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struct blob set_wiredata;
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};
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/*
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* Collection of HID reports from an authenticator issued with a FIDO2
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* 'authenticatorLargeBlobs' 'get' command.
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*/
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static const uint8_t dummy_get_wiredata[] = {
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WIREDATA_CTAP_INIT,
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WIREDATA_CTAP_CBOR_INFO,
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WIREDATA_CTAP_CBOR_LARGEBLOB_GET_ARRAY
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};
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/*
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* Collection of HID reports from an authenticator issued with a FIDO2
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* 'authenticatorLargeBlobs' 'set' command.
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*/
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static const uint8_t dummy_set_wiredata[] = {
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WIREDATA_CTAP_INIT,
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WIREDATA_CTAP_CBOR_INFO,
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WIREDATA_CTAP_CBOR_LARGEBLOB_GET_ARRAY,
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WIREDATA_CTAP_CBOR_AUTHKEY,
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WIREDATA_CTAP_CBOR_PINTOKEN,
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WIREDATA_CTAP_CBOR_STATUS
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};
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/*
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* XXX this needs to match the encrypted blob embedded in
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* WIREDATA_CTAP_CBOR_LARGEBLOB_GET_ARRAY.
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*/
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static const uint8_t dummy_key[] = {
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0xa9, 0x1b, 0xc4, 0xdd, 0xfc, 0x9a, 0x93, 0x79,
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0x75, 0xba, 0xf7, 0x7f, 0x4d, 0x57, 0xfc, 0xa6,
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0xe1, 0xf8, 0x06, 0x43, 0x23, 0x99, 0x51, 0x32,
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0xce, 0x6e, 0x19, 0x84, 0x50, 0x13, 0x2d, 0x7b
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};
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struct param *
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unpack(const uint8_t *ptr, size_t len)
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{
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cbor_item_t *item = NULL, **v;
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struct cbor_load_result cbor;
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struct param *p;
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int ok = -1;
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if ((p = calloc(1, sizeof(*p))) == NULL ||
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(item = cbor_load(ptr, len, &cbor)) == NULL ||
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cbor.read != len ||
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cbor_isa_array(item) == false ||
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cbor_array_is_definite(item) == false ||
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cbor_array_size(item) != 5 ||
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(v = cbor_array_handle(item)) == NULL)
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goto fail;
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if (unpack_int(v[0], &p->seed) < 0 ||
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unpack_string(v[1], p->pin) < 0 ||
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unpack_blob(v[2], &p->key) < 0 ||
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unpack_blob(v[3], &p->get_wiredata) < 0 ||
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unpack_blob(v[4], &p->set_wiredata) < 0)
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goto fail;
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ok = 0;
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fail:
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if (ok < 0) {
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free(p);
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p = NULL;
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}
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if (item)
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cbor_decref(&item);
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return p;
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}
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size_t
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pack(uint8_t *ptr, size_t len, const struct param *p)
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{
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cbor_item_t *argv[5], *array = NULL;
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size_t cbor_alloc_len, cbor_len = 0;
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unsigned char *cbor = NULL;
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memset(argv, 0, sizeof(argv));
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if ((array = cbor_new_definite_array(5)) == NULL ||
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(argv[0] = pack_int(p->seed)) == NULL ||
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(argv[1] = pack_string(p->pin)) == NULL ||
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(argv[2] = pack_blob(&p->key)) == NULL ||
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(argv[3] = pack_blob(&p->get_wiredata)) == NULL ||
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(argv[4] = pack_blob(&p->set_wiredata)) == NULL)
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goto fail;
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for (size_t i = 0; i < 5; i++)
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if (cbor_array_push(array, argv[i]) == false)
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goto fail;
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if ((cbor_len = cbor_serialize_alloc(array, &cbor,
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&cbor_alloc_len)) > len) {
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cbor_len = 0;
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goto fail;
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}
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memcpy(ptr, cbor, cbor_len);
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fail:
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for (size_t i = 0; i < 5; i++)
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if (argv[i])
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cbor_decref(&argv[i]);
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if (array)
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cbor_decref(&array);
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free(cbor);
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return cbor_len;
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}
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size_t
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pack_dummy(uint8_t *ptr, size_t len)
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{
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struct param dummy;
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uint8_t blob[4096];
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size_t blob_len;
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memset(&dummy, 0, sizeof(dummy));
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strlcpy(dummy.pin, dummy_pin, sizeof(dummy.pin));
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dummy.get_wiredata.len = sizeof(dummy_get_wiredata);
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dummy.set_wiredata.len = sizeof(dummy_set_wiredata);
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dummy.key.len = sizeof(dummy_key);
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memcpy(&dummy.get_wiredata.body, &dummy_get_wiredata,
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dummy.get_wiredata.len);
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memcpy(&dummy.set_wiredata.body, &dummy_set_wiredata,
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dummy.set_wiredata.len);
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memcpy(&dummy.key.body, &dummy_key, dummy.key.len);
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assert((blob_len = pack(blob, sizeof(blob), &dummy)) != 0);
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if (blob_len > len) {
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memcpy(ptr, blob, len);
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return len;
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}
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memcpy(ptr, blob, blob_len);
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return blob_len;
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}
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static fido_dev_t *
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prepare_dev(void)
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{
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fido_dev_t *dev;
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if ((dev = open_dev(0)) == NULL)
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return NULL;
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return dev;
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}
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static void
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get_blob(const struct param *p, int array)
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{
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fido_dev_t *dev;
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u_char *ptr = NULL;
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size_t len = 0;
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set_wire_data(p->get_wiredata.body, p->get_wiredata.len);
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if ((dev = prepare_dev()) == NULL)
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return;
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if (array)
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fido_dev_largeblob_get_array(dev, &ptr, &len);
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else
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fido_dev_largeblob_get(dev, p->key.body, p->key.len, &ptr, &len);
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consume(ptr, len);
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free(ptr);
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fido_dev_close(dev);
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fido_dev_free(&dev);
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}
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static void
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set_blob(const struct param *p, int op)
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{
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fido_dev_t *dev;
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const char *pin;
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set_wire_data(p->set_wiredata.body, p->set_wiredata.len);
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if ((dev = prepare_dev()) == NULL)
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return;
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pin = p->pin;
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if (strlen(pin) == 0)
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pin = NULL;
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switch (op) {
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case 0:
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fido_dev_largeblob_remove(dev, p->key.body, p->key.len, pin);
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break;
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case 1:
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/* XXX reuse p->get_wiredata as the blob to be set */
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fido_dev_largeblob_set(dev, p->key.body, p->key.len,
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p->get_wiredata.body, p->get_wiredata.len, pin);
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break;
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case 2:
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/* XXX reuse p->get_wiredata as the body of the cbor array */
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fido_dev_largeblob_set_array(dev, p->get_wiredata.body,
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p->get_wiredata.len, pin);
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}
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fido_dev_close(dev);
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fido_dev_free(&dev);
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}
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void
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test(const struct param *p)
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{
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prng_init((unsigned int)p->seed);
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fuzz_clock_reset();
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fido_init(FIDO_DEBUG);
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fido_set_log_handler(consume_str);
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get_blob(p, 0);
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get_blob(p, 1);
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set_blob(p, 0);
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set_blob(p, 1);
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set_blob(p, 2);
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}
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void
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mutate(struct param *p, unsigned int seed, unsigned int flags) NO_MSAN
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{
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if (flags & MUTATE_SEED)
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p->seed = (int)seed;
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if (flags & MUTATE_PARAM) {
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mutate_blob(&p->key);
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mutate_string(p->pin);
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}
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if (flags & MUTATE_WIREDATA) {
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mutate_blob(&p->get_wiredata);
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mutate_blob(&p->set_wiredata);
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}
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}
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