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239
fuzz/fuzz_hid.c
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239
fuzz/fuzz_hid.c
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/*
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* Copyright (c) 2020-2021 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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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "../openbsd-compat/openbsd-compat.h"
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#include "mutator_aux.h"
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#include "dummy.h"
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extern int fido_hid_get_usage(const uint8_t *, size_t, uint32_t *);
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extern int fido_hid_get_report_len(const uint8_t *, size_t, size_t *, size_t *);
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extern void set_udev_parameters(const char *, const struct blob *);
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struct param {
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int seed;
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char uevent[MAXSTR];
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struct blob report_descriptor;
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struct blob netlink_wiredata;
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};
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/*
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* Sample HID report descriptor from the FIDO HID interface of a YubiKey 5.
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*/
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static const uint8_t dummy_report_descriptor[] = {
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0x06, 0xd0, 0xf1, 0x09, 0x01, 0xa1, 0x01, 0x09,
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0x20, 0x15, 0x00, 0x26, 0xff, 0x00, 0x75, 0x08,
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0x95, 0x40, 0x81, 0x02, 0x09, 0x21, 0x15, 0x00,
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0x26, 0xff, 0x00, 0x75, 0x08, 0x95, 0x40, 0x91,
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0x02, 0xc0
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};
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/*
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* Sample uevent file from a Yubico Security Key.
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*/
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static const char dummy_uevent[] =
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"DRIVER=hid-generic\n"
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"HID_ID=0003:00001050:00000120\n"
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"HID_NAME=Yubico Security Key by Yubico\n"
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"HID_PHYS=usb-0000:00:14.0-3/input0\n"
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"HID_UNIQ=\n"
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"MODALIAS=hid:b0003g0001v00001050p00000120\n";
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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) != 4 ||
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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->uevent) < 0 ||
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unpack_blob(v[2], &p->report_descriptor) < 0 ||
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unpack_blob(v[3], &p->netlink_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[4], *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(4)) == NULL ||
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(argv[0] = pack_int(p->seed)) == NULL ||
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(argv[1] = pack_string(p->uevent)) == NULL ||
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(argv[2] = pack_blob(&p->report_descriptor)) == NULL ||
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(argv[3] = pack_blob(&p->netlink_wiredata)) == NULL)
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goto fail;
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for (size_t i = 0; i < 4; 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)) == 0 || cbor_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 < 4; 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[MAXCORPUS];
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size_t blob_len;
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memset(&dummy, 0, sizeof(dummy));
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dummy.report_descriptor.len = sizeof(dummy_report_descriptor);
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strlcpy(dummy.uevent, dummy_uevent, sizeof(dummy.uevent));
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memcpy(&dummy.report_descriptor.body, &dummy_report_descriptor,
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dummy.report_descriptor.len);
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dummy.netlink_wiredata.len = sizeof(dummy_netlink_wiredata);
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memcpy(&dummy.netlink_wiredata.body, &dummy_netlink_wiredata,
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dummy.netlink_wiredata.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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blob_len = len;
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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 void
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get_usage(const struct param *p)
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{
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uint32_t usage_page = 0;
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fido_hid_get_usage(p->report_descriptor.body, p->report_descriptor.len,
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&usage_page);
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consume(&usage_page, sizeof(usage_page));
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}
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static void
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get_report_len(const struct param *p)
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{
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size_t report_in_len = 0;
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size_t report_out_len = 0;
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fido_hid_get_report_len(p->report_descriptor.body,
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p->report_descriptor.len, &report_in_len, &report_out_len);
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consume(&report_in_len, sizeof(report_in_len));
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consume(&report_out_len, sizeof(report_out_len));
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}
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static void
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manifest(const struct param *p)
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{
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size_t ndevs, nfound;
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fido_dev_info_t *devlist = NULL, *devlist_set = NULL;
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int16_t vendor_id, product_id;
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fido_dev_io_t io;
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fido_dev_transport_t t;
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memset(&io, 0, sizeof(io));
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memset(&t, 0, sizeof(t));
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set_netlink_io_functions(fd_read, fd_write);
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set_wire_data(p->netlink_wiredata.body, p->netlink_wiredata.len);
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set_udev_parameters(p->uevent, &p->report_descriptor);
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ndevs = uniform_random(64);
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if ((devlist = fido_dev_info_new(ndevs)) == NULL ||
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(devlist_set = fido_dev_info_new(1)) == NULL ||
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fido_dev_info_manifest(devlist, ndevs, &nfound) != FIDO_OK)
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goto out;
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for (size_t i = 0; i < nfound; i++) {
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const fido_dev_info_t *di = fido_dev_info_ptr(devlist, i);
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consume_str(fido_dev_info_path(di));
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consume_str(fido_dev_info_manufacturer_string(di));
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consume_str(fido_dev_info_product_string(di));
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vendor_id = fido_dev_info_vendor(di);
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product_id = fido_dev_info_product(di);
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consume(&vendor_id, sizeof(vendor_id));
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consume(&product_id, sizeof(product_id));
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fido_dev_info_set(devlist_set, 0, fido_dev_info_path(di),
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fido_dev_info_manufacturer_string(di),
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fido_dev_info_product_string(di), &io, &t);
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}
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out:
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fido_dev_info_free(&devlist, ndevs);
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fido_dev_info_free(&devlist_set, 1);
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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_usage(p);
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get_report_len(p);
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manifest(p);
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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->report_descriptor);
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mutate_string(p->uevent);
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}
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if (flags & MUTATE_WIREDATA)
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mutate_blob(&p->netlink_wiredata);
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}
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