127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
/*
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* Copyright 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef SOFT_GATEKEEPER_H_
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#define SOFT_GATEKEEPER_H_
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extern "C" {
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#include <openssl/rand.h>
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#include <crypto_scrypt.h>
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}
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#include <UniquePtr.h>
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#include <gatekeeper/gatekeeper.h>
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#include <iostream>
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#include <unordered_map>
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namespace gatekeeper {
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class SoftGateKeeper : public GateKeeper {
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public:
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static const uint32_t SIGNATURE_LENGTH_BYTES = 32;
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// scrypt params
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static const uint64_t N = 16384;
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static const uint32_t r = 8;
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static const uint32_t p = 1;
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static const int MAX_UINT_32_CHARS = 11;
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SoftGateKeeper() {
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key_.reset(new uint8_t[SIGNATURE_LENGTH_BYTES]);
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memset(key_.get(), 0, SIGNATURE_LENGTH_BYTES);
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}
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virtual ~SoftGateKeeper() {
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}
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virtual bool GetAuthTokenKey(const uint8_t **auth_token_key,
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uint32_t *length) const {
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if (auth_token_key == NULL || length == NULL) return false;
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*auth_token_key = const_cast<const uint8_t *>(key_.get());
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*length = SIGNATURE_LENGTH_BYTES;
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return true;
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}
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virtual void GetPasswordKey(const uint8_t **password_key, uint32_t *length) {
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if (password_key == NULL || length == NULL) return;
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*password_key = const_cast<const uint8_t *>(key_.get());
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*length = SIGNATURE_LENGTH_BYTES;
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}
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virtual void ComputePasswordSignature(uint8_t *signature, uint32_t signature_length,
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const uint8_t *, uint32_t, const uint8_t *password,
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uint32_t password_length, salt_t salt) const {
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if (signature == NULL) return;
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crypto_scrypt(password, password_length, reinterpret_cast<uint8_t *>(&salt),
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sizeof(salt), N, r, p, signature, signature_length);
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}
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virtual void GetRandom(void *random, uint32_t requested_length) const {
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if (random == NULL) return;
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RAND_pseudo_bytes((uint8_t *) random, requested_length);
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}
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virtual void ComputeSignature(uint8_t *signature, uint32_t signature_length,
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const uint8_t *, uint32_t, const uint8_t *, const uint32_t) const {
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if (signature == NULL) return;
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memset(signature, 0, signature_length);
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}
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virtual uint64_t GetMillisecondsSinceBoot() const {
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struct timespec time;
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int res = clock_gettime(CLOCK_BOOTTIME, &time);
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if (res < 0) return 0;
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return (time.tv_sec * 1000) + (time.tv_nsec / 1000 / 1000);
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}
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virtual bool IsHardwareBacked() const {
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return false;
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}
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virtual bool GetFailureRecord(uint32_t uid, secure_id_t user_id, failure_record_t *record) {
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failure_record_t *stored = &failure_map_[uid];
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if (user_id != stored->secure_user_id) {
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stored->secure_user_id = user_id;
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stored->last_checked_timestamp = 0;
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stored->failure_counter = 0;
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}
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memcpy(record, stored, sizeof(*record));
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return true;
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}
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virtual void ClearFailureRecord(uint32_t uid, secure_id_t user_id) {
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failure_record_t *stored = &failure_map_[uid];
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stored->secure_user_id = user_id;
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stored->last_checked_timestamp = 0;
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stored->failure_counter = 0;
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}
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virtual bool WriteFailureRecord(uint32_t uid, failure_record_t *record) {
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failure_map_[uid] = *record;
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return true;
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}
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private:
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UniquePtr<uint8_t> key_;
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std::unordered_map<uint32_t, failure_record_t> failure_map_;
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};
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}
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#endif // SOFT_GATEKEEPER_H_
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