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385 lines
10 KiB
385 lines
10 KiB
// Copyright 2014 Google Inc. All rights reserved.
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//
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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 or at
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// https://developers.google.com/open-source/licenses/bsd
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// U2F register / sign compliance test.
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <iostream>
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#include <iomanip>
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#ifdef __OS_WIN
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#include <winsock2.h> // ntohl, htonl
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#else
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#include <arpa/inet.h> // ntohl, htonl
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#endif
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#include "u2f.h"
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#include "u2f_util.h"
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#include "dsa_sig.h"
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#include "p256.h"
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#include "p256_ecdsa.h"
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#include "sha256.h"
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using namespace std;
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int arg_Verbose = 0; // default
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bool arg_Pause = false; // default
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bool arg_Abort = true; // default
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static
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void pause(const string& prompt) {
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printf("\n%s", prompt.c_str());
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getchar();
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printf("\n");
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}
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static
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void checkPause(const string& prompt) {
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if (arg_Pause) pause(prompt);
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}
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static
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void AbortOrNot() {
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checkPause("Hit enter to continue..");
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if (arg_Abort) exit(3);
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cerr << "(continuing -a)" << endl;
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}
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void WaitForUserPresence(struct U2Fob* device, bool hasButton) {
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int touched = DEV_touch(device);
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U2Fob_close(device);
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if (!touched) {
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pause(string(hasButton ? "Touch" : "Re-insert") + " device and hit enter..");
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}
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CHECK_EQ(0, U2Fob_reopen(device));
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CHECK_EQ(0, U2Fob_init(device));
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}
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struct U2Fob* device;
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U2F_REGISTER_REQ regReq;
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U2F_REGISTER_RESP regRsp;
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U2F_AUTHENTICATE_REQ authReq;
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void test_Version() {
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string rsp;
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int res = U2Fob_apdu(device, 0, U2F_INS_VERSION, 0, 0, "", &rsp);
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if (res == 0x9000) {
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CHECK_EQ(rsp, "U2F_V2");
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return;
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}
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// Non-ISO 7816-4 compliant U2F_INS_VERSION "APDU" that includes Lc value 0,
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// for compatibility with older devices.
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uint8_t buf[4 + 3 + 2];
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buf[0] = 0; // CLA
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buf[1] = U2F_INS_VERSION; // INS
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buf[2] = 0; // P1
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buf[3] = 0; // P2
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buf[4] = 0; // extended length
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buf[5] = 0; // Lc = 0 (Not ISO 7816-4 compliant)
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buf[6] = 0; // Lc = 0 (Not ISO 7816-4 compliant)
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buf[7] = 0; // Le = 0
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buf[8] = 0; // Le = 0
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CHECK_EQ(0x9000, U2Fob_exchange_apdu_buffer(device, buf, sizeof(buf), &rsp));
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CHECK_EQ(rsp, "U2F_V2");
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}
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void test_UnknownINS() {
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string rsp;
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CHECK_EQ(0x6D00, U2Fob_apdu(device, 0, 0 /* not U2F INS */,
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0, 0, "", &rsp));
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CHECK_EQ(rsp.empty(), true);
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}
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void test_BadCLA() {
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string rsp;
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CHECK_EQ(0x6E00, U2Fob_apdu(device, 1 /* not U2F CLA, 0x00 */,
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U2F_INS_VERSION, 0, 0, "abc", &rsp));
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CHECK_EQ(rsp.empty(), true);
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}
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void test_WrongLength_U2F_VERSION() {
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string rsp;
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// U2F_VERSION does not take any input.
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CHECK_EQ(0x6700, U2Fob_apdu(device, 0, U2F_INS_VERSION, 0, 0, "abc", &rsp));
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CHECK_EQ(rsp.empty(), true);
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}
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void test_WrongLength_U2F_REGISTER() {
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string rsp;
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// U2F_REGISTER does expect input.
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CHECK_EQ(0x6700, U2Fob_apdu(device, 0, U2F_INS_REGISTER, 0, 0, "abc", &rsp));
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CHECK_EQ(rsp.empty(), true);
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}
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void test_Enroll(int expectedSW12 = 0x9000) {
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uint64_t t = 0; U2Fob_deltaTime(&t);
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string rsp;
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CHECK_EQ(expectedSW12,
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U2Fob_apdu(device, 0, U2F_INS_REGISTER, U2F_AUTH_ENFORCE, 0,
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string(reinterpret_cast<char*>(®Req),
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sizeof(regReq)),
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&rsp));
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if (expectedSW12 != 0x9000) {
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CHECK_EQ(true, rsp.empty());
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return;
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}
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CHECK_NE(rsp.empty(), true);
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CHECK_LE(rsp.size(), sizeof(U2F_REGISTER_RESP));
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memcpy(®Rsp, rsp.data(), rsp.size());
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CHECK_EQ(regRsp.registerId, U2F_REGISTER_ID);
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CHECK_EQ(regRsp.pubKey.format, UNCOMPRESSED_POINT);
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INFO << "Enroll: " << rsp.size() << " bytes in "
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<< U2Fob_deltaTime(&t) << "s";
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// Check crypto of enroll response.
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string cert;
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CHECK_EQ(getCertificate(regRsp, &cert), true);
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INFO << "cert: " << b2a(cert);
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string pk;
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CHECK_EQ(getSubjectPublicKey(cert, &pk), true);
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INFO << "pk : " << b2a(pk);
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string sig;
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CHECK_EQ(getSignature(regRsp, &sig), true);
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INFO << "sig : " << b2a(sig);
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// Parse signature into two integers.
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p256_int sig_r, sig_s;
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CHECK_EQ(1, dsa_sig_unpack((uint8_t*) (sig.data()), sig.size(),
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&sig_r, &sig_s));
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// Compute hash as integer.
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p256_int h;
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SHA256_CTX sha;
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SHA256_init(&sha);
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uint8_t rfu = 0;
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SHA256_update(&sha, &rfu, sizeof(rfu)); // 0x00
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SHA256_update(&sha, regReq.appId, sizeof(regReq.appId)); // O
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SHA256_update(&sha, regReq.nonce, sizeof(regReq.nonce)); // d
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SHA256_update(&sha, regRsp.keyHandleCertSig, regRsp.keyHandleLen); // hk
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SHA256_update(&sha, ®Rsp.pubKey, sizeof(regRsp.pubKey)); // pk
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p256_from_bin(SHA256_final(&sha), &h);
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// Parse subject public key into two integers.
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CHECK_EQ(pk.size(), P256_POINT_SIZE);
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p256_int pk_x, pk_y;
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p256_from_bin((uint8_t*) pk.data() + 1, &pk_x);
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p256_from_bin((uint8_t*) pk.data() + 1 + P256_SCALAR_SIZE, &pk_y);
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// Verify signature.
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CHECK_EQ(1, p256_ecdsa_verify(&pk_x, &pk_y, &h, &sig_r, &sig_s));
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#if 0
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// Check for standard U2F self-signed certificate.
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// Implementations without batch attestation should use this minimalist
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// self-signed certificate for enroll.
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// Conforming to a standard self-signed certficate format and attributes
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// bins all such fobs into a single large batch, which helps privacy.
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string selfSigned = a2b(
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"3081B3A003020102020101300A06082A8648CE3D040302300E310C300A060355040A0C035532463022180F32303030303130313030303030305A180F32303939313233313233353935395A300E310C300A060355040313035532463059301306072A8648CE3D020106082A8648CE3D030107034200") + pk;
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SHA256_init(&sha);
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SHA256_update(&sha, selfSigned.data(), selfSigned.size());
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p256_from_bin(SHA256_final(&sha), &h);
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string certSig;
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CHECK_EQ(getCertSignature(cert, &certSig), true);
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INFO << "certSig : " << b2a(certSig);
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CHECK_EQ(1, dsa_sig_unpack((uint8_t*) (certSig.data()), certSig.size(),
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&sig_r, &sig_s));
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// Verify cert signature.
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CHECK_EQ(1, p256_ecdsa_verify(&pk_x, &pk_y, &h, &sig_r, &sig_s));
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#endif
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}
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// returns ctr
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uint32_t test_Sign(int expectedSW12 = 0x9000, bool checkOnly = false) {
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memcpy(authReq.appId, regReq.appId, sizeof(authReq.appId));
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authReq.keyHandleLen = regRsp.keyHandleLen;
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memcpy(authReq.keyHandle, regRsp.keyHandleCertSig, authReq.keyHandleLen);
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uint64_t t = 0; U2Fob_deltaTime(&t);
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string rsp;
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CHECK_EQ(expectedSW12,
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U2Fob_apdu(device, 0, U2F_INS_AUTHENTICATE,
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checkOnly ? U2F_AUTH_CHECK_ONLY : U2F_AUTH_ENFORCE, 0,
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string(reinterpret_cast<char*>(&authReq),
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U2F_NONCE_SIZE + U2F_APPID_SIZE + 1 +
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authReq.keyHandleLen),
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&rsp));
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if (expectedSW12 != 0x9000) {
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CHECK_EQ(true, rsp.empty());
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return 0;
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}
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CHECK_NE(rsp.empty(), true);
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CHECK_LE(rsp.size(), sizeof(U2F_AUTHENTICATE_RESP));
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U2F_AUTHENTICATE_RESP resp;
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memcpy(&resp, rsp.data(), rsp.size());
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CHECK_EQ(resp.flags, 0x01);
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INFO << "Sign: " << rsp.size() << " bytes in "
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<< U2Fob_deltaTime(&t) << "s";
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// Parse signature from authenticate response.
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p256_int sig_r, sig_s;
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CHECK_EQ(1, dsa_sig_unpack(resp.sig,
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rsp.size() - sizeof(resp.flags) - sizeof(resp.ctr),
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&sig_r, &sig_s));
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// Compute hash as integer.
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p256_int h;
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SHA256_CTX sha;
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SHA256_init(&sha);
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SHA256_update(&sha, regReq.appId, sizeof(regReq.appId)); // O
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SHA256_update(&sha, &resp.flags, sizeof(resp.flags)); // T
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SHA256_update(&sha, &resp.ctr, sizeof(resp.ctr)); // CTR
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SHA256_update(&sha, authReq.nonce, sizeof(authReq.nonce)); // d
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p256_from_bin(SHA256_final(&sha), &h);
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// Parse public key from registration response.
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p256_int pk_x, pk_y;
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p256_from_bin(regRsp.pubKey.x, &pk_x);
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p256_from_bin(regRsp.pubKey.y, &pk_y);
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// Verify signature.
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CHECK_EQ(1, p256_ecdsa_verify(&pk_x, &pk_y, &h, &sig_r, &sig_s));
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return ntohl(resp.ctr);
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}
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void check_Compilation() {
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// Couple of sanity checks.
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CHECK_EQ(sizeof(P256_POINT), 65);
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CHECK_EQ(sizeof(U2F_REGISTER_REQ), 64);
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}
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int main(int argc, char* argv[]) {
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if (argc < 2) {
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cerr << "Usage: " << argv[0]
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<< " <device-path> [-a] [-v] [-V] [-p] [-b]" << endl;
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return -1;
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}
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device = U2Fob_create();
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char* arg_DeviceName = argv[1];
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bool arg_hasButton = true; // fob has button
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while (--argc > 1) {
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if (!strncmp(argv[argc], "-v", 2)) {
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// Log INFO.
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arg_Verbose |= 1;
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}
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if (!strncmp(argv[argc], "-V", 2)) {
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// Log everything.
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arg_Verbose |= 2;
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U2Fob_setLog(device, stdout, -1);
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}
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if (!strncmp(argv[argc], "-a", 2)) {
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// Don't abort, try continue;
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arg_Abort = false;
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}
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if (!strncmp(argv[argc], "-p", 2)) {
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// Pause at abort
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arg_Pause = true;
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}
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if (!strncmp(argv[argc], "-b", 2)) {
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// Fob does not have button
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arg_hasButton = false;
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}
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}
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srand((unsigned int) time(NULL));
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CHECK_EQ(0, U2Fob_open(device, arg_DeviceName));
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CHECK_EQ(0, U2Fob_init(device));
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PASS(check_Compilation());
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PASS(test_Version());
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PASS(test_UnknownINS());
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PASS(test_WrongLength_U2F_VERSION());
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PASS(test_WrongLength_U2F_REGISTER());
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PASS(test_BadCLA());
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// pick random origin and challenge.
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for (size_t i = 0; i < sizeof(regReq.nonce); ++i)
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regReq.nonce[i] = rand();
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for (size_t i = 0; i < sizeof(regReq.appId); ++i)
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regReq.appId[i] = rand();
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// Fob with button should need touch.
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if (arg_hasButton) PASS(test_Enroll(0x6985));
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WaitForUserPresence(device, arg_hasButton);
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PASS(test_Enroll(0x9000));
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// pick random challenge and use registered appId.
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for (size_t i = 0; i < sizeof(authReq.nonce); ++i)
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authReq.nonce[i] = rand();
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// Fob with button should have consumed touch.
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if (arg_hasButton) PASS(test_Sign(0x6985));
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// Sign with check only should not produce signature.
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PASS(test_Sign(0x6985, true));
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// Sign with wrong hk.
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regRsp.keyHandleCertSig[0] ^= 0x55;
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PASS(test_Sign(0x6a80));
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regRsp.keyHandleCertSig[0] ^= 0x55;
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// Sign with wrong appid.
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regReq.appId[0] ^= 0xaa;
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PASS(test_Sign(0x6a80));
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regReq.appId[0] ^= 0xaa;
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WaitForUserPresence(device, arg_hasButton);
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// Sign with check only should not produce signature.
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PASS(test_Sign(0x6985, true));
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uint32_t ctr1;
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PASS(ctr1 = test_Sign(0x9000));
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PASS(test_Sign(0x6985));
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WaitForUserPresence(device, arg_hasButton);
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uint32_t ctr2;
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PASS(ctr2 = test_Sign(0x9000));
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// Ctr should have incremented by 1.
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CHECK_EQ(ctr2, ctr1 + 1);
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regRsp.keyHandleLen -= 8; // perturb keyhandle length
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PASS(test_Sign(0x6a80, false));
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U2Fob_destroy(device);
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return 0;
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}
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