diff options
Diffstat (limited to 'fuzz/fuzz_credman.c')
| -rw-r--r-- | fuzz/fuzz_credman.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/fuzz/fuzz_credman.c b/fuzz/fuzz_credman.c new file mode 100644 index 0000000..ef21475 --- /dev/null +++ b/fuzz/fuzz_credman.c @@ -0,0 +1,407 @@ +/* + * 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); + } +} |