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freebsd-dev/contrib/libfido2/fuzz/fuzz_cred.c
Ed Maste f540a43052 libfido2: update to 1.9.0 
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
2023-05-05 19:11:52 -04:00

479 lines
13 KiB
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.
*/
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mutator_aux.h"
#include "wiredata_fido2.h"
#include "wiredata_u2f.h"
#include "dummy.h"
#include "../openbsd-compat/openbsd-compat.h"
/* Parameter set defining a FIDO2 make credential operation. */
struct param {
char pin[MAXSTR];
char rp_id[MAXSTR];
char rp_name[MAXSTR];
char user_icon[MAXSTR];
char user_name[MAXSTR];
char user_nick[MAXSTR];
int ext;
int seed;
struct blob cdh;
struct blob excl_cred;
struct blob user_id;
struct blob wire_data;
uint8_t excl_count;
uint8_t rk;
uint8_t type;
uint8_t opt;
uint8_t uv;
};
/*
* Collection of HID reports from an authenticator issued with a FIDO2
* make credential using the example parameters above.
*/
static const uint8_t dummy_wire_data_fido[] = {
WIREDATA_CTAP_INIT,
WIREDATA_CTAP_CBOR_INFO,
WIREDATA_CTAP_CBOR_AUTHKEY,
WIREDATA_CTAP_CBOR_PINTOKEN,
WIREDATA_CTAP_KEEPALIVE,
WIREDATA_CTAP_KEEPALIVE,
WIREDATA_CTAP_KEEPALIVE,
WIREDATA_CTAP_CBOR_CRED,
};
/*
* Collection of HID reports from an authenticator issued with a U2F
* registration using the example parameters above.
*/
static const uint8_t dummy_wire_data_u2f[] = {
WIREDATA_CTAP_INIT,
WIREDATA_CTAP_U2F_6985,
WIREDATA_CTAP_U2F_6985,
WIREDATA_CTAP_U2F_6985,
WIREDATA_CTAP_U2F_6985,
WIREDATA_CTAP_U2F_6985,
WIREDATA_CTAP_U2F_REGISTER,
};
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) != 17 ||
(v = cbor_array_handle(item)) == NULL)
goto fail;
if (unpack_byte(v[0], &p->rk) < 0 ||
unpack_byte(v[1], &p->type) < 0 ||
unpack_byte(v[2], &p->opt) < 0 ||
unpack_byte(v[3], &p->uv) < 0 ||
unpack_byte(v[4], &p->excl_count) < 0 ||
unpack_int(v[5], &p->ext) < 0 ||
unpack_int(v[6], &p->seed) < 0 ||
unpack_string(v[7], p->pin) < 0 ||
unpack_string(v[8], p->rp_id) < 0 ||
unpack_string(v[9], p->rp_name) < 0 ||
unpack_string(v[10], p->user_icon) < 0 ||
unpack_string(v[11], p->user_name) < 0 ||
unpack_string(v[12], p->user_nick) < 0 ||
unpack_blob(v[13], &p->cdh) < 0 ||
unpack_blob(v[14], &p->user_id) < 0 ||
unpack_blob(v[15], &p->wire_data) < 0 ||
unpack_blob(v[16], &p->excl_cred) < 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[17], *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(17)) == NULL ||
(argv[0] = pack_byte(p->rk)) == NULL ||
(argv[1] = pack_byte(p->type)) == NULL ||
(argv[2] = pack_byte(p->opt)) == NULL ||
(argv[3] = pack_byte(p->uv)) == NULL ||
(argv[4] = pack_byte(p->excl_count)) == NULL ||
(argv[5] = pack_int(p->ext)) == NULL ||
(argv[6] = pack_int(p->seed)) == NULL ||
(argv[7] = pack_string(p->pin)) == NULL ||
(argv[8] = pack_string(p->rp_id)) == NULL ||
(argv[9] = pack_string(p->rp_name)) == NULL ||
(argv[10] = pack_string(p->user_icon)) == NULL ||
(argv[11] = pack_string(p->user_name)) == NULL ||
(argv[12] = pack_string(p->user_nick)) == NULL ||
(argv[13] = pack_blob(&p->cdh)) == NULL ||
(argv[14] = pack_blob(&p->user_id)) == NULL ||
(argv[15] = pack_blob(&p->wire_data)) == NULL ||
(argv[16] = pack_blob(&p->excl_cred)) == NULL)
goto fail;
for (size_t i = 0; i < 17; i++)
if (cbor_array_push(array, argv[i]) == false)
goto fail;
if ((cbor_len = cbor_serialize_alloc(array, &cbor,
&cbor_alloc_len)) > len) {
cbor_len = 0;
goto fail;
}
memcpy(ptr, cbor, cbor_len);
fail:
for (size_t i = 0; i < 17; 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[4096];
size_t blob_len;
memset(&dummy, 0, sizeof(dummy));
dummy.type = 1;
dummy.ext = FIDO_EXT_HMAC_SECRET;
strlcpy(dummy.pin, dummy_pin, sizeof(dummy.pin));
strlcpy(dummy.rp_id, dummy_rp_id, sizeof(dummy.rp_id));
strlcpy(dummy.rp_name, dummy_rp_name, sizeof(dummy.rp_name));
strlcpy(dummy.user_icon, dummy_user_icon, sizeof(dummy.user_icon));
strlcpy(dummy.user_name, dummy_user_name, sizeof(dummy.user_name));
strlcpy(dummy.user_nick, dummy_user_nick, sizeof(dummy.user_nick));
dummy.cdh.len = sizeof(dummy_cdh);
dummy.user_id.len = sizeof(dummy_user_id);
dummy.wire_data.len = sizeof(dummy_wire_data_fido);
memcpy(&dummy.cdh.body, &dummy_cdh, dummy.cdh.len);
memcpy(&dummy.user_id.body, &dummy_user_id, dummy.user_id.len);
memcpy(&dummy.wire_data.body, &dummy_wire_data_fido,
dummy.wire_data.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 void
make_cred(fido_cred_t *cred, uint8_t opt, int type, const struct blob *cdh,
const char *rp_id, const char *rp_name, const struct blob *user_id,
const char *user_name, const char *user_nick, const char *user_icon,
int ext, uint8_t rk, uint8_t uv, const char *pin, uint8_t excl_count,
const struct blob *excl_cred)
{
fido_dev_t *dev;
if ((dev = open_dev(opt & 2)) == NULL)
return;
if (opt & 1)
fido_dev_force_u2f(dev);
for (uint8_t i = 0; i < excl_count; i++)
fido_cred_exclude(cred, excl_cred->body, excl_cred->len);
fido_cred_set_type(cred, type);
fido_cred_set_clientdata_hash(cred, cdh->body, cdh->len);
fido_cred_set_rp(cred, rp_id, rp_name);
fido_cred_set_user(cred, user_id->body, user_id->len, user_name,
user_nick, user_icon);
if (ext & FIDO_EXT_HMAC_SECRET)
fido_cred_set_extensions(cred, FIDO_EXT_HMAC_SECRET);
if (ext & FIDO_EXT_CRED_BLOB)
fido_cred_set_blob(cred, user_id->body, user_id->len);
if (ext & FIDO_EXT_LARGEBLOB_KEY)
fido_cred_set_extensions(cred, FIDO_EXT_LARGEBLOB_KEY);
if (ext & FIDO_EXT_MINPINLEN)
fido_cred_set_pin_minlen(cred, strlen(pin));
if (rk & 1)
fido_cred_set_rk(cred, FIDO_OPT_TRUE);
if (uv & 1)
fido_cred_set_uv(cred, FIDO_OPT_TRUE);
if (user_id->len)
fido_cred_set_prot(cred, user_id->body[0] & 0x03);
/* repeat memory operations to trigger reallocation paths */
fido_cred_set_type(cred, type);
fido_cred_set_clientdata_hash(cred, cdh->body, cdh->len);
fido_cred_set_rp(cred, rp_id, rp_name);
fido_cred_set_user(cred, user_id->body, user_id->len, user_name,
user_nick, user_icon);
if (strlen(pin) == 0)
pin = NULL;
fido_dev_make_cred(dev, cred, (opt & 1) ? NULL : pin);
fido_dev_cancel(dev);
fido_dev_close(dev);
fido_dev_free(&dev);
}
static void
verify_cred(int type, const unsigned char *cdh_ptr, size_t cdh_len,
const char *rp_id, const char *rp_name, const unsigned char *authdata_ptr,
size_t authdata_len, const unsigned char *authdata_raw_ptr,
size_t authdata_raw_len, int ext, uint8_t rk, uint8_t uv,
const unsigned char *x5c_ptr, size_t x5c_len, const unsigned char *sig_ptr,
size_t sig_len, const unsigned char *attstmt_ptr, size_t attstmt_len,
const char *fmt, int prot, size_t minpinlen)
{
fido_cred_t *cred;
uint8_t flags;
uint32_t sigcount;
int r;
if ((cred = fido_cred_new()) == NULL)
return;
fido_cred_set_type(cred, type);
fido_cred_set_clientdata_hash(cred, cdh_ptr, cdh_len);
fido_cred_set_rp(cred, rp_id, rp_name);
consume(authdata_ptr, authdata_len);
consume(authdata_raw_ptr, authdata_raw_len);
consume(x5c_ptr, x5c_len);
consume(sig_ptr, sig_len);
consume(attstmt_ptr, attstmt_len);
if (fido_cred_set_authdata(cred, authdata_ptr, authdata_len) != FIDO_OK)
fido_cred_set_authdata_raw(cred, authdata_raw_ptr,
authdata_raw_len);
fido_cred_set_extensions(cred, ext);
if (fido_cred_set_attstmt(cred, attstmt_ptr, attstmt_len) != FIDO_OK) {
fido_cred_set_x509(cred, x5c_ptr, x5c_len);
fido_cred_set_sig(cred, sig_ptr, sig_len);
}
fido_cred_set_prot(cred, prot);
fido_cred_set_pin_minlen(cred, minpinlen);
if (rk & 1)
fido_cred_set_rk(cred, FIDO_OPT_TRUE);
if (uv & 1)
fido_cred_set_uv(cred, FIDO_OPT_TRUE);
if (fmt)
fido_cred_set_fmt(cred, fmt);
/* repeat memory operations to trigger reallocation paths */
if (fido_cred_set_authdata(cred, authdata_ptr, authdata_len) != FIDO_OK)
fido_cred_set_authdata_raw(cred, authdata_raw_ptr,
authdata_raw_len);
if (fido_cred_set_attstmt(cred, attstmt_ptr, attstmt_len) != FIDO_OK) {
fido_cred_set_x509(cred, x5c_ptr, x5c_len);
fido_cred_set_sig(cred, sig_ptr, sig_len);
}
fido_cred_set_x509(cred, x5c_ptr, x5c_len);
fido_cred_set_sig(cred, sig_ptr, sig_len);
r = fido_cred_verify(cred);
consume(&r, sizeof(r));
r = fido_cred_verify_self(cred);
consume(&r, sizeof(r));
consume(fido_cred_pubkey_ptr(cred), fido_cred_pubkey_len(cred));
consume(fido_cred_id_ptr(cred), fido_cred_id_len(cred));
consume(fido_cred_aaguid_ptr(cred), fido_cred_aaguid_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));
consume(fido_cred_largeblob_key_ptr(cred),
fido_cred_largeblob_key_len(cred));
flags = fido_cred_flags(cred);
consume(&flags, sizeof(flags));
sigcount = fido_cred_sigcount(cred);
consume(&sigcount, sizeof(sigcount));
type = fido_cred_type(cred);
consume(&type, sizeof(type));
minpinlen = fido_cred_pin_minlen(cred);
consume(&minpinlen, sizeof(minpinlen));
fido_cred_free(&cred);
}
static void
test_cred(const struct param *p)
{
fido_cred_t *cred = NULL;
int cose_alg = 0;
if ((cred = fido_cred_new()) == NULL)
return;
switch (p->type & 3) {
case 0:
cose_alg = COSE_ES256;
break;
case 1:
cose_alg = COSE_RS256;
break;
default:
cose_alg = COSE_EDDSA;
break;
}
set_wire_data(p->wire_data.body, p->wire_data.len);
make_cred(cred, p->opt, cose_alg, &p->cdh, p->rp_id, p->rp_name,
&p->user_id, p->user_name, p->user_nick, p->user_icon, p->ext,
p->rk, p->uv, p->pin, p->excl_count, &p->excl_cred);
verify_cred(cose_alg,
fido_cred_clientdata_hash_ptr(cred),
fido_cred_clientdata_hash_len(cred), fido_cred_rp_id(cred),
fido_cred_rp_name(cred), fido_cred_authdata_ptr(cred),
fido_cred_authdata_len(cred), fido_cred_authdata_raw_ptr(cred),
fido_cred_authdata_raw_len(cred), p->ext, p->rk, p->uv,
fido_cred_x5c_ptr(cred), fido_cred_x5c_len(cred),
fido_cred_sig_ptr(cred), fido_cred_sig_len(cred),
fido_cred_attstmt_ptr(cred), fido_cred_attstmt_len(cred),
fido_cred_fmt(cred), fido_cred_prot(cred),
fido_cred_pin_minlen(cred));
fido_cred_free(&cred);
}
static void
test_touch(const struct param *p)
{
fido_dev_t *dev;
int r;
int touched;
set_wire_data(p->wire_data.body, p->wire_data.len);
if ((dev = open_dev(p->opt & 2)) == NULL)
return;
if (p->opt & 1)
fido_dev_force_u2f(dev);
r = fido_dev_get_touch_begin(dev);
consume_str(fido_strerr(r));
r = fido_dev_get_touch_status(dev, &touched, -1);
consume_str(fido_strerr(r));
consume(&touched, sizeof(touched));
fido_dev_cancel(dev);
fido_dev_close(dev);
fido_dev_free(&dev);
}
static void
test_misc(const struct param *p)
{
fido_cred_t *cred = NULL;
if ((cred = fido_cred_new()) == NULL)
return;
/* reuse user id as credential id */
fido_cred_set_id(cred, p->user_id.body, p->user_id.len);
consume(fido_cred_id_ptr(cred), fido_cred_id_len(cred));
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);
test_cred(p);
test_touch(p);
test_misc(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_byte(&p->rk);
mutate_byte(&p->type);
mutate_byte(&p->opt);
mutate_byte(&p->uv);
mutate_byte(&p->excl_count);
mutate_int(&p->ext);
mutate_blob(&p->cdh);
mutate_blob(&p->user_id);
mutate_blob(&p->excl_cred);
mutate_string(p->pin);
mutate_string(p->user_icon);
mutate_string(p->user_name);
mutate_string(p->user_nick);
mutate_string(p->rp_id);
mutate_string(p->rp_name);
}
if (flags & MUTATE_WIREDATA) {
if (p->opt & 1) {
p->wire_data.len = sizeof(dummy_wire_data_u2f);
memcpy(&p->wire_data.body, &dummy_wire_data_u2f,
p->wire_data.len);
} else {
p->wire_data.len = sizeof(dummy_wire_data_fido);
memcpy(&p->wire_data.body, &dummy_wire_data_fido,
p->wire_data.len);
}
mutate_blob(&p->wire_data);
}
}
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