/* * Copyright (c) 2019 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 #include #include #include #include #include "mutator_aux.h" #include "fido.h" #include "../openbsd-compat/openbsd-compat.h" #define TAG_U2F 0x01 #define TAG_TYPE 0x02 #define TAG_CDH 0x03 #define TAG_RP_ID 0x04 #define TAG_RP_NAME 0x05 #define TAG_USER_ID 0x06 #define TAG_USER_NAME 0x07 #define TAG_USER_NICK 0x08 #define TAG_USER_ICON 0x09 #define TAG_EXT 0x0a #define TAG_SEED 0x0b #define TAG_RK 0x0c #define TAG_UV 0x0d #define TAG_PIN 0x0e #define TAG_WIRE_DATA 0x0f #define TAG_EXCL_COUNT 0x10 #define TAG_EXCL_CRED 0x11 /* 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 u2f; uint8_t uv; }; /* Example parameters. */ static const char dummy_rp_id[] = "localhost"; static const char dummy_rp_name[] = "sweet home localhost"; static const char dummy_pin[] = "9}4gT:8d=A37Dh}U"; static const char dummy_user_icon[] = "an icon"; static const char dummy_user_name[] = "john smith"; static const char dummy_user_nick[] = "jsmith"; static const uint8_t dummy_cdh[] = { 0xf9, 0x64, 0x57, 0xe7, 0x2d, 0x97, 0xf6, 0xbb, 0xdd, 0xd7, 0xfb, 0x06, 0x37, 0x62, 0xea, 0x26, 0x20, 0x44, 0x8e, 0x69, 0x7c, 0x03, 0xf2, 0x31, 0x2f, 0x99, 0xdc, 0xaf, 0x3e, 0x8a, 0x91, 0x6b, }; static const uint8_t dummy_user_id[] = { 0x78, 0x1c, 0x78, 0x60, 0xad, 0x88, 0xd2, 0x63, 0x32, 0x62, 0x2a, 0xf1, 0x74, 0x5d, 0xed, 0xb2, 0xe7, 0xa4, 0x2b, 0x44, 0x89, 0x29, 0x39, 0xc5, 0x56, 0x64, 0x01, 0x27, 0x0d, 0xbb, 0xc4, 0x49, }; /* * Collection of HID reports from an authenticator issued with a FIDO2 * make credential using the example parameters above. */ static const 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HID reports from an authenticator issued with a U2F * registration using the example parameters above. */ static const uint8_t dummy_wire_data_u2f[] = { 0xff, 0xff, 0xff, 0xff, 0x86, 0x00, 0x11, 0x8e, 0x80, 0xd0, 0xe2, 0x3b, 0x24, 0x93, 0xea, 0x00, 0x00, 0x99, 0x01, 0x02, 0x01, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x99, 0x01, 0x83, 0x00, 0x02, 0x69, 0x85, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x99, 0x01, 0x83, 0x00, 0x02, 0x69, 0x85, 0x00, 0x00, 0x00, 0x00, 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0x00, 0x00, 0x00, 0x00, 0x00 }; int LLVMFuzzerTestOneInput(const uint8_t *, size_t); size_t LLVMFuzzerCustomMutator(uint8_t *, size_t, size_t, unsigned int); static int unpack(const uint8_t *ptr, size_t len, struct param *p) NO_MSAN { uint8_t **pp = (void *)&ptr; if (unpack_byte(TAG_RK, pp, &len, &p->rk) < 0 || unpack_byte(TAG_TYPE, pp, &len, &p->type) < 0 || unpack_byte(TAG_U2F, pp, &len, &p->u2f) < 0 || unpack_byte(TAG_UV, pp, &len, &p->uv) < 0 || unpack_byte(TAG_EXCL_COUNT, pp, &len, &p->excl_count) < 0 || unpack_string(TAG_PIN, pp, &len, p->pin) < 0 || unpack_string(TAG_RP_ID, pp, &len, p->rp_id) < 0 || unpack_string(TAG_RP_NAME, pp, &len, p->rp_name) < 0 || unpack_string(TAG_USER_ICON, pp, &len, p->user_icon) < 0 || unpack_string(TAG_USER_NAME, pp, &len, p->user_name) < 0 || unpack_string(TAG_USER_NICK, pp, &len, p->user_nick) < 0 || unpack_int(TAG_EXT, pp, &len, &p->ext) < 0 || unpack_int(TAG_SEED, pp, &len, &p->seed) < 0 || unpack_blob(TAG_CDH, pp, &len, &p->cdh) < 0 || unpack_blob(TAG_USER_ID, pp, &len, &p->user_id) < 0 || unpack_blob(TAG_WIRE_DATA, pp, &len, &p->wire_data) < 0 || unpack_blob(TAG_EXCL_CRED, pp, &len, &p->excl_cred) < 0) return (-1); return (0); } static size_t pack(uint8_t *ptr, size_t len, const struct param *p) { const size_t max = len; if (pack_byte(TAG_RK, &ptr, &len, p->rk) < 0 || pack_byte(TAG_TYPE, &ptr, &len, p->type) < 0 || pack_byte(TAG_U2F, &ptr, &len, p->u2f) < 0 || pack_byte(TAG_UV, &ptr, &len, p->uv) < 0 || pack_byte(TAG_EXCL_COUNT, &ptr, &len, p->excl_count) < 0 || pack_string(TAG_PIN, &ptr, &len, p->pin) < 0 || pack_string(TAG_RP_ID, &ptr, &len, p->rp_id) < 0 || pack_string(TAG_RP_NAME, &ptr, &len, p->rp_name) < 0 || pack_string(TAG_USER_ICON, &ptr, &len, p->user_icon) < 0 || pack_string(TAG_USER_NAME, &ptr, &len, p->user_name) < 0 || pack_string(TAG_USER_NICK, &ptr, &len, p->user_nick) < 0 || pack_int(TAG_EXT, &ptr, &len, p->ext) < 0 || pack_int(TAG_SEED, &ptr, &len, p->seed) < 0 || pack_blob(TAG_CDH, &ptr, &len, &p->cdh) < 0 || pack_blob(TAG_USER_ID, &ptr, &len, &p->user_id) < 0 || pack_blob(TAG_WIRE_DATA, &ptr, &len, &p->wire_data) < 0 || pack_blob(TAG_EXCL_CRED, &ptr, &len, &p->excl_cred) < 0) return (0); return (max - len); } static void make_cred(fido_cred_t *cred, uint8_t u2f, int type, const struct blob *cdh, const char *rp_id, const char *rp_name, 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, struct blob *excl_cred) { fido_dev_t *dev; fido_dev_io_t io; io.open = dev_open; io.close = dev_close; io.read = dev_read; io.write = dev_write; if ((dev = fido_dev_new()) == NULL || fido_dev_set_io_functions(dev, &io) != FIDO_OK || fido_dev_open(dev, "nodev") != FIDO_OK) { fido_dev_free(&dev); return; } if (u2f & 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); fido_cred_set_extensions(cred, ext); if (rk & 1) fido_cred_set_rk(cred, FIDO_OPT_TRUE); if (uv & 1) fido_cred_set_uv(cred, FIDO_OPT_TRUE); fido_dev_make_cred(dev, cred, u2f & 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, 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 char *fmt) { fido_cred_t *cred; uint8_t flags; if ((cred = fido_cred_new()) == NULL) { warnx("%s: fido_cred_new", __func__); 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); if (fido_cred_set_authdata(cred, authdata_ptr, authdata_len) != FIDO_OK) fido_cred_set_authdata_raw(cred, authdata_ptr, authdata_len); fido_cred_set_extensions(cred, ext); fido_cred_set_x509(cred, x5c_ptr, x5c_len); fido_cred_set_sig(cred, sig_ptr, sig_len); 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); fido_cred_verify(cred); fido_cred_verify_self(cred); 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_user_id_ptr(cred), fido_cred_user_id_len(cred)); consume(fido_cred_user_name(cred), xstrlen(fido_cred_user_name(cred))); consume(fido_cred_display_name(cred), xstrlen(fido_cred_display_name(cred))); flags = fido_cred_flags(cred); consume(&flags, sizeof(flags)); type = fido_cred_type(cred); consume(&type, sizeof(type)); fido_cred_free(&cred); } int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { struct param p; fido_cred_t *cred = NULL; int cose_alg = 0; memset(&p, 0, sizeof(p)); if (unpack(data, size, &p) < 0) return (0); srandom((unsigned int)p.seed); fido_init(0); if ((cred = fido_cred_new()) == NULL) return (0); set_wire_data(p.wire_data.body, p.wire_data.len); switch (p.type & 3) { case 0: cose_alg = COSE_ES256; break; case 1: cose_alg = COSE_RS256; break; default: cose_alg = COSE_EDDSA; break; } make_cred(cred, p.u2f, 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), 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_fmt(cred)); fido_cred_free(&cred); return (0); } static size_t pack_dummy(uint8_t *ptr, size_t len) { struct param dummy; uint8_t blob[16384]; 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); blob_len = pack(blob, sizeof(blob), &dummy); assert(blob_len != 0); if (blob_len > len) { memcpy(ptr, blob, len); return (len); } memcpy(ptr, blob, blob_len); return (blob_len); } size_t LLVMFuzzerCustomMutator(uint8_t *data, size_t size, size_t maxsize, unsigned int seed) NO_MSAN { struct param p; uint8_t blob[16384]; size_t blob_len; memset(&p, 0, sizeof(p)); if (unpack(data, size, &p) < 0) return (pack_dummy(data, maxsize)); mutate_byte(&p.rk); mutate_byte(&p.type); mutate_byte(&p.u2f); mutate_byte(&p.uv); mutate_byte(&p.excl_count); mutate_int(&p.ext); p.seed = (int)seed; mutate_blob(&p.cdh); mutate_blob(&p.user_id); if (p.u2f & 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); 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); blob_len = pack(blob, sizeof(blob), &p); if (blob_len == 0 || blob_len > maxsize) return (0); memcpy(data, blob, blob_len); return (blob_len); }