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fuzz/fuzz_credman.c

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+/*
+ * Copyright (c) 2019-2021 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 <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mutator_aux.h"
+#include "wiredata_fido2.h"
+#include "dummy.h"
+
+#include "../openbsd-compat/openbsd-compat.h"
+
+/* Parameter set defining a FIDO2 credential management operation. */
+struct param {
+	char pin[MAXSTR];
+	char rp_id[MAXSTR];
+	int seed;
+	struct blob cred_id;
+	struct blob del_wire_data;
+	struct blob meta_wire_data;
+	struct blob rk_wire_data;
+	struct blob rp_wire_data;
+};
+
+/*
+ * Collection of HID reports from an authenticator issued with a FIDO2
+ * 'getCredsMetadata' credential management command.
+ */
+static const uint8_t dummy_meta_wire_data[] = {
+	WIREDATA_CTAP_INIT,
+	WIREDATA_CTAP_CBOR_INFO,
+	WIREDATA_CTAP_CBOR_AUTHKEY,
+	WIREDATA_CTAP_CBOR_PINTOKEN,
+	WIREDATA_CTAP_CBOR_CREDMAN_META,
+};
+
+/*
+ * Collection of HID reports from an authenticator issued with a FIDO2
+ * 'enumerateRPsBegin' credential management command.
+ */
+static const uint8_t dummy_rp_wire_data[] = {
+	WIREDATA_CTAP_INIT,
+	WIREDATA_CTAP_CBOR_INFO,
+	WIREDATA_CTAP_CBOR_AUTHKEY,
+	WIREDATA_CTAP_CBOR_PINTOKEN,
+	WIREDATA_CTAP_CBOR_CREDMAN_RPLIST,
+};
+
+/*
+ * Collection of HID reports from an authenticator issued with a FIDO2
+ * 'enumerateCredentialsBegin' credential management command.
+ */
+static const uint8_t dummy_rk_wire_data[] = {
+	WIREDATA_CTAP_INIT,
+	WIREDATA_CTAP_CBOR_INFO,
+	WIREDATA_CTAP_CBOR_AUTHKEY,
+	WIREDATA_CTAP_CBOR_PINTOKEN,
+	WIREDATA_CTAP_CBOR_CREDMAN_RKLIST,
+};
+
+/*
+ * Collection of HID reports from an authenticator issued with a FIDO2
+ * 'deleteCredential' credential management command.
+ */
+static const uint8_t dummy_del_wire_data[] = {
+	WIREDATA_CTAP_INIT,
+	WIREDATA_CTAP_CBOR_INFO,
+	WIREDATA_CTAP_CBOR_AUTHKEY,
+	WIREDATA_CTAP_CBOR_PINTOKEN,
+	WIREDATA_CTAP_CBOR_STATUS,
+};
+
+struct param *
+unpack(const uint8_t *ptr, size_t len)
+{
+	cbor_item_t *item = NULL, **v;
+	struct cbor_load_result cbor;
+	struct param *p;
+	int ok = -1;
+
+	if ((p = calloc(1, sizeof(*p))) == NULL ||
+	    (item = cbor_load(ptr, len, &cbor)) == NULL ||
+	    cbor.read != len ||
+	    cbor_isa_array(item) == false ||
+	    cbor_array_is_definite(item) == false ||
+	    cbor_array_size(item) != 8 ||
+	    (v = cbor_array_handle(item)) == NULL)
+		goto fail;
+
+	if (unpack_int(v[0], &p->seed) < 0 ||
+	    unpack_string(v[1], p->pin) < 0 ||
+	    unpack_string(v[2], p->rp_id) < 0 ||
+	    unpack_blob(v[3], &p->cred_id) < 0 ||
+	    unpack_blob(v[4], &p->meta_wire_data) < 0 ||
+	    unpack_blob(v[5], &p->rp_wire_data) < 0 ||
+	    unpack_blob(v[6], &p->rk_wire_data) < 0 ||
+	    unpack_blob(v[7], &p->del_wire_data) < 0)
+		goto fail;
+
+	ok = 0;
+fail:
+	if (ok < 0) {
+		free(p);
+		p = NULL;
+	}
+
+	if (item)
+		cbor_decref(&item);
+
+	return p;
+}
+
+size_t
+pack(uint8_t *ptr, size_t len, const struct param *p)
+{
+	cbor_item_t *argv[8], *array = NULL;
+	size_t cbor_alloc_len, cbor_len = 0;
+	unsigned char *cbor = NULL;
+
+	memset(argv, 0, sizeof(argv));
+
+	if ((array = cbor_new_definite_array(8)) == NULL ||
+	    (argv[0] = pack_int(p->seed)) == NULL ||
+	    (argv[1] = pack_string(p->pin)) == NULL ||
+	    (argv[2] = pack_string(p->rp_id)) == NULL ||
+	    (argv[3] = pack_blob(&p->cred_id)) == NULL ||
+	    (argv[4] = pack_blob(&p->meta_wire_data)) == NULL ||
+	    (argv[5] = pack_blob(&p->rp_wire_data)) == NULL ||
+	    (argv[6] = pack_blob(&p->rk_wire_data)) == NULL ||
+	    (argv[7] = pack_blob(&p->del_wire_data)) == NULL)
+		goto fail;
+
+	for (size_t i = 0; i < 8; i++)
+		if (cbor_array_push(array, argv[i]) == false)
+			goto fail;
+
+	if ((cbor_len = cbor_serialize_alloc(array, &cbor,
+	    &cbor_alloc_len)) == 0 || cbor_len > len) {
+		cbor_len = 0;
+		goto fail;
+	}
+
+	memcpy(ptr, cbor, cbor_len);
+fail:
+	for (size_t i = 0; i < 8; i++)
+		if (argv[i])
+			cbor_decref(&argv[i]);
+
+	if (array)
+		cbor_decref(&array);
+
+	free(cbor);
+
+	return cbor_len;
+}
+
+size_t
+pack_dummy(uint8_t *ptr, size_t len)
+{
+	struct param dummy;
+	uint8_t blob[MAXCORPUS];
+	size_t blob_len;
+
+	memset(&dummy, 0, sizeof(dummy));
+
+	strlcpy(dummy.pin, dummy_pin, sizeof(dummy.pin));
+	strlcpy(dummy.rp_id, dummy_rp_id, sizeof(dummy.rp_id));
+
+	dummy.meta_wire_data.len = sizeof(dummy_meta_wire_data);
+	dummy.rp_wire_data.len = sizeof(dummy_rp_wire_data);
+	dummy.rk_wire_data.len = sizeof(dummy_rk_wire_data);
+	dummy.del_wire_data.len = sizeof(dummy_del_wire_data);
+	dummy.cred_id.len = sizeof(dummy_cred_id);
+
+	memcpy(&dummy.meta_wire_data.body, &dummy_meta_wire_data,
+	    dummy.meta_wire_data.len);
+	memcpy(&dummy.rp_wire_data.body, &dummy_rp_wire_data,
+	    dummy.rp_wire_data.len);
+	memcpy(&dummy.rk_wire_data.body, &dummy_rk_wire_data,
+	    dummy.rk_wire_data.len);
+	memcpy(&dummy.del_wire_data.body, &dummy_del_wire_data,
+	    dummy.del_wire_data.len);
+	memcpy(&dummy.cred_id.body, &dummy_cred_id, dummy.cred_id.len);
+
+	assert((blob_len = pack(blob, sizeof(blob), &dummy)) != 0);
+
+	if (blob_len > len) {
+		memcpy(ptr, blob, len);
+		return len;
+	}
+
+	memcpy(ptr, blob, blob_len);
+
+	return blob_len;
+}
+
+static fido_dev_t *
+prepare_dev(void)
+{
+	fido_dev_t *dev;
+	bool x;
+
+	if ((dev = open_dev(0)) == NULL)
+		return NULL;
+
+	x = fido_dev_is_fido2(dev);
+	consume(&x, sizeof(x));
+	x = fido_dev_supports_cred_prot(dev);
+	consume(&x, sizeof(x));
+	x = fido_dev_supports_credman(dev);
+	consume(&x, sizeof(x));
+
+	return dev;
+}
+
+static void
+get_metadata(const struct param *p)
+{
+	fido_dev_t *dev;
+	fido_credman_metadata_t *metadata;
+	uint64_t existing;
+	uint64_t remaining;
+
+	set_wire_data(p->meta_wire_data.body, p->meta_wire_data.len);
+
+	if ((dev = prepare_dev()) == NULL)
+		return;
+
+	if ((metadata = fido_credman_metadata_new()) == NULL) {
+		fido_dev_close(dev);
+		fido_dev_free(&dev);
+		return;
+	}
+
+	fido_credman_get_dev_metadata(dev, metadata, p->pin);
+
+	existing = fido_credman_rk_existing(metadata);
+	remaining = fido_credman_rk_remaining(metadata);
+	consume(&existing, sizeof(existing));
+	consume(&remaining, sizeof(remaining));
+
+	fido_credman_metadata_free(&metadata);
+	fido_dev_close(dev);
+	fido_dev_free(&dev);
+}
+
+static void
+get_rp_list(const struct param *p)
+{
+	fido_dev_t *dev;
+	fido_credman_rp_t *rp;
+
+	set_wire_data(p->rp_wire_data.body, p->rp_wire_data.len);
+
+	if ((dev = prepare_dev()) == NULL)
+		return;
+
+	if ((rp = fido_credman_rp_new()) == NULL) {
+		fido_dev_close(dev);
+		fido_dev_free(&dev);
+		return;
+	}
+
+	fido_credman_get_dev_rp(dev, rp, p->pin);
+
+	/* +1 on purpose */
+	for (size_t i = 0; i < fido_credman_rp_count(rp) + 1; i++) {
+		consume(fido_credman_rp_id_hash_ptr(rp, i),
+		    fido_credman_rp_id_hash_len(rp, i));
+		consume_str(fido_credman_rp_id(rp, i));
+		consume_str(fido_credman_rp_name(rp, i));
+	}
+
+	fido_credman_rp_free(&rp);
+	fido_dev_close(dev);
+	fido_dev_free(&dev);
+}
+
+static void
+get_rk_list(const struct param *p)
+{
+	fido_dev_t *dev;
+	fido_credman_rk_t *rk;
+	const fido_cred_t *cred;
+	int val;
+
+	set_wire_data(p->rk_wire_data.body, p->rk_wire_data.len);
+
+	if ((dev = prepare_dev()) == NULL)
+		return;
+
+	if ((rk = fido_credman_rk_new()) == NULL) {
+		fido_dev_close(dev);
+		fido_dev_free(&dev);
+		return;
+	}
+
+	fido_credman_get_dev_rk(dev, p->rp_id, rk, p->pin);
+
+	/* +1 on purpose */
+	for (size_t i = 0; i < fido_credman_rk_count(rk) + 1; i++) {
+		if ((cred = fido_credman_rk(rk, i)) == NULL) {
+			assert(i >= fido_credman_rk_count(rk));
+			continue;
+		}
+		val = fido_cred_type(cred);
+		consume(&val, sizeof(val));
+		consume(fido_cred_id_ptr(cred), fido_cred_id_len(cred));
+		consume(fido_cred_pubkey_ptr(cred), fido_cred_pubkey_len(cred));
+		consume(fido_cred_user_id_ptr(cred),
+		    fido_cred_user_id_len(cred));
+		consume_str(fido_cred_user_name(cred));
+		consume_str(fido_cred_display_name(cred));
+		val = fido_cred_prot(cred);
+		consume(&val, sizeof(val));
+	}
+
+	fido_credman_rk_free(&rk);
+	fido_dev_close(dev);
+	fido_dev_free(&dev);
+}
+
+static void
+del_rk(const struct param *p)
+{
+	fido_dev_t *dev;
+
+	set_wire_data(p->del_wire_data.body, p->del_wire_data.len);
+
+	if ((dev = prepare_dev()) == NULL)
+		return;
+
+	fido_credman_del_dev_rk(dev, p->cred_id.body, p->cred_id.len, p->pin);
+	fido_dev_close(dev);
+	fido_dev_free(&dev);
+}
+
+static void
+set_rk(const struct param *p)
+{
+	fido_dev_t *dev = NULL;
+	fido_cred_t *cred = NULL;
+	const char *pin = p->pin;
+	int r0, r1, r2;
+
+	set_wire_data(p->del_wire_data.body, p->del_wire_data.len);
+
+	if ((dev = prepare_dev()) == NULL)
+		return;
+	if ((cred = fido_cred_new()) == NULL)
+		goto out;
+	r0 = fido_cred_set_id(cred, p->cred_id.body, p->cred_id.len);
+	r1 = fido_cred_set_user(cred, p->cred_id.body, p->cred_id.len, p->rp_id,
+	    NULL, NULL);
+	if (strlen(pin) == 0)
+		pin = NULL;
+	r2 = fido_credman_set_dev_rk(dev, cred, pin);
+	consume(&r0, sizeof(r0));
+	consume(&r1, sizeof(r1));
+	consume(&r2, sizeof(r2));
+out:
+	fido_dev_close(dev);
+	fido_dev_free(&dev);
+	fido_cred_free(&cred);
+}
+
+void
+test(const struct param *p)
+{
+	prng_init((unsigned int)p->seed);
+	fuzz_clock_reset();
+	fido_init(FIDO_DEBUG);
+	fido_set_log_handler(consume_str);
+
+	get_metadata(p);
+	get_rp_list(p);
+	get_rk_list(p);
+	del_rk(p);
+	set_rk(p);
+}
+
+void
+mutate(struct param *p, unsigned int seed, unsigned int flags) NO_MSAN
+{
+	if (flags & MUTATE_SEED)
+		p->seed = (int)seed;
+
+	if (flags & MUTATE_PARAM) {
+		mutate_blob(&p->cred_id);
+		mutate_string(p->pin);
+		mutate_string(p->rp_id);
+	}
+
+	if (flags & MUTATE_WIREDATA) {
+		mutate_blob(&p->meta_wire_data);
+		mutate_blob(&p->rp_wire_data);
+		mutate_blob(&p->rk_wire_data);
+		mutate_blob(&p->del_wire_data);
+	}
+}