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upload android base code part6

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August 2018-08-08 17:48:24 +08:00
parent 421e214c7d
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45
android/device/generic/goldfish/gatekeeper/Android.mk Normal file
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#
# Copyright (C) 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_VENDOR_MODULE := true
LOCAL_MODULE := gatekeeper.ranchu
LOCAL_MODULE_RELATIVE_PATH := hw
LOCAL_CFLAGS := -Wall -Wextra -Werror -Wunused
LOCAL_SRC_FILES := \
module.cpp \
SoftGateKeeperDevice.cpp
LOCAL_SHARED_LIBRARIES := \
libbinder \
libgatekeeper \
liblog \
libhardware \
libbase \
libutils \
libcrypto \
libhidlbase \
libhidltransport \
libhwbinder \
android.hardware.gatekeeper@1.0 \
LOCAL_STATIC_LIBRARIES := libscrypt_static
LOCAL_C_INCLUDES := external/scrypt/lib/crypto
include $(BUILD_SHARED_LIBRARY)

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android/device/generic/goldfish/gatekeeper/SoftGateKeeper.h Normal file
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/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef SOFT_GATEKEEPER_H_
#define SOFT_GATEKEEPER_H_
extern "C" {
#include <openssl/rand.h>
#include <openssl/sha.h>
#include <crypto_scrypt.h>
}
#include <android-base/memory.h>
#include <gatekeeper/gatekeeper.h>
#include <iostream>
#include <unordered_map>
#include <memory>
namespace gatekeeper {
struct fast_hash_t {
uint64_t salt;
uint8_t digest[SHA256_DIGEST_LENGTH];
};
class SoftGateKeeper : public GateKeeper {
public:
static const uint32_t SIGNATURE_LENGTH_BYTES = 32;
// scrypt params
static const uint64_t N = 16384;
static const uint32_t r = 8;
static const uint32_t p = 1;
static const int MAX_UINT_32_CHARS = 11;
SoftGateKeeper() {
key_.reset(new uint8_t[SIGNATURE_LENGTH_BYTES]);
memset(key_.get(), 0, SIGNATURE_LENGTH_BYTES);
}
virtual ~SoftGateKeeper() {
}
virtual bool GetAuthTokenKey(const uint8_t **auth_token_key,
uint32_t *length) const {
if (auth_token_key == NULL || length == NULL) return false;
uint8_t *auth_token_key_copy = new uint8_t[SIGNATURE_LENGTH_BYTES];
memcpy(auth_token_key_copy, key_.get(), SIGNATURE_LENGTH_BYTES);
*auth_token_key = auth_token_key_copy;
*length = SIGNATURE_LENGTH_BYTES;
return true;
}
virtual void GetPasswordKey(const uint8_t **password_key, uint32_t *length) {
if (password_key == NULL || length == NULL) return;
uint8_t *password_key_copy = new uint8_t[SIGNATURE_LENGTH_BYTES];
memcpy(password_key_copy, key_.get(), SIGNATURE_LENGTH_BYTES);
*password_key = password_key_copy;
*length = SIGNATURE_LENGTH_BYTES;
}
virtual void ComputePasswordSignature(uint8_t *signature, uint32_t signature_length,
const uint8_t *, uint32_t, const uint8_t *password,
uint32_t password_length, salt_t salt) const {
if (signature == NULL) return;
crypto_scrypt(password, password_length, reinterpret_cast<uint8_t *>(&salt),
sizeof(salt), N, r, p, signature, signature_length);
}
virtual void GetRandom(void *random, uint32_t requested_length) const {
if (random == NULL) return;
RAND_pseudo_bytes((uint8_t *) random, requested_length);
}
virtual void ComputeSignature(uint8_t *signature, uint32_t signature_length,
const uint8_t *, uint32_t, const uint8_t *, const uint32_t) const {
if (signature == NULL) return;
memset(signature, 0, signature_length);
}
virtual uint64_t GetMillisecondsSinceBoot() const {
struct timespec time;
int res = clock_gettime(CLOCK_BOOTTIME, &time);
if (res < 0) return 0;
return (time.tv_sec * 1000) + (time.tv_nsec / 1000 / 1000);
}
virtual bool IsHardwareBacked() const {
return false;
}
virtual bool GetFailureRecord(uint32_t uid, secure_id_t user_id, failure_record_t *record,
bool /* secure */) {
failure_record_t *stored = &failure_map_[uid];
if (user_id != stored->secure_user_id) {
stored->secure_user_id = user_id;
stored->last_checked_timestamp = 0;
stored->failure_counter = 0;
}
memcpy(record, stored, sizeof(*record));
return true;
}
virtual bool ClearFailureRecord(uint32_t uid, secure_id_t user_id, bool /* secure */) {
failure_record_t *stored = &failure_map_[uid];
stored->secure_user_id = user_id;
stored->last_checked_timestamp = 0;
stored->failure_counter = 0;
return true;
}
virtual bool WriteFailureRecord(uint32_t uid, failure_record_t *record, bool /* secure */) {
failure_map_[uid] = *record;
return true;
}
fast_hash_t ComputeFastHash(const SizedBuffer &password, uint64_t salt) {
fast_hash_t fast_hash;
size_t digest_size = password.length + sizeof(salt);
std::unique_ptr<uint8_t[]> digest(new uint8_t[digest_size]);
memcpy(digest.get(), &salt, sizeof(salt));
memcpy(digest.get() + sizeof(salt), password.buffer.get(), password.length);
SHA256(digest.get(), digest_size, (uint8_t *) &fast_hash.digest);
fast_hash.salt = salt;
return fast_hash;
}
bool VerifyFast(const fast_hash_t &fast_hash, const SizedBuffer &password) {
fast_hash_t computed = ComputeFastHash(password, fast_hash.salt);
return memcmp(computed.digest, fast_hash.digest, SHA256_DIGEST_LENGTH) == 0;
}
bool DoVerify(const password_handle_t *expected_handle, const SizedBuffer &password) {
uint64_t user_id = android::base::get_unaligned<secure_id_t>(&expected_handle->user_id);
FastHashMap::const_iterator it = fast_hash_map_.find(user_id);
if (it != fast_hash_map_.end() && VerifyFast(it->second, password)) {
return true;
} else {
if (GateKeeper::DoVerify(expected_handle, password)) {
uint64_t salt;
GetRandom(&salt, sizeof(salt));
fast_hash_map_[user_id] = ComputeFastHash(password, salt);
return true;
}
}
return false;
}
private:
typedef std::unordered_map<uint32_t, failure_record_t> FailureRecordMap;
typedef std::unordered_map<uint64_t, fast_hash_t> FastHashMap;
std::unique_ptr<uint8_t[]> key_;
FailureRecordMap failure_map_;
FastHashMap fast_hash_map_;
};
}
#endif // SOFT_GATEKEEPER_H_

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android/device/generic/goldfish/gatekeeper/SoftGateKeeperDevice.cpp Normal file
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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SoftGateKeeper.h"
#include "SoftGateKeeperDevice.h"
namespace goldfish {
int SoftGateKeeperDevice::enroll(uint32_t uid,
const uint8_t *current_password_handle, uint32_t current_password_handle_length,
const uint8_t *current_password, uint32_t current_password_length,
const uint8_t *desired_password, uint32_t desired_password_length,
uint8_t **enrolled_password_handle, uint32_t *enrolled_password_handle_length) {
if (enrolled_password_handle == NULL || enrolled_password_handle_length == NULL ||
desired_password == NULL || desired_password_length == 0)
return -EINVAL;
// Current password and current password handle go together
if (current_password_handle == NULL || current_password_handle_length == 0 ||
current_password == NULL || current_password_length == 0) {
current_password_handle = NULL;
current_password_handle_length = 0;
current_password = NULL;
current_password_length = 0;
}
SizedBuffer desired_password_buffer(desired_password_length);
memcpy(desired_password_buffer.buffer.get(), desired_password, desired_password_length);
SizedBuffer current_password_handle_buffer(current_password_handle_length);
if (current_password_handle) {
memcpy(current_password_handle_buffer.buffer.get(), current_password_handle,
current_password_handle_length);
}
SizedBuffer current_password_buffer(current_password_length);
if (current_password) {
memcpy(current_password_buffer.buffer.get(), current_password, current_password_length);
}
EnrollRequest request(uid, &current_password_handle_buffer, &desired_password_buffer,
&current_password_buffer);
EnrollResponse response;
impl_->Enroll(request, &response);
if (response.error == ERROR_RETRY) {
return response.retry_timeout;
} else if (response.error != ERROR_NONE) {
return -EINVAL;
}
*enrolled_password_handle = response.enrolled_password_handle.buffer.release();
gatekeeper::password_handle_t *handle =
reinterpret_cast<gatekeeper::password_handle_t *>(*enrolled_password_handle);
//FIXIT: We need to move this module to host with gatekeeper pipe
handle->hardware_backed = true;
*enrolled_password_handle_length = response.enrolled_password_handle.length;
return 0;
}
int SoftGateKeeperDevice::verify(uint32_t uid,
uint64_t challenge, const uint8_t *enrolled_password_handle,
uint32_t enrolled_password_handle_length, const uint8_t *provided_password,
uint32_t provided_password_length, uint8_t **auth_token, uint32_t *auth_token_length,
bool *request_reenroll) {
if (enrolled_password_handle == NULL ||
provided_password == NULL) {
return -EINVAL;
}
SizedBuffer password_handle_buffer(enrolled_password_handle_length);
memcpy(password_handle_buffer.buffer.get(), enrolled_password_handle,
enrolled_password_handle_length);
SizedBuffer provided_password_buffer(provided_password_length);
memcpy(provided_password_buffer.buffer.get(), provided_password, provided_password_length);
VerifyRequest request(uid, challenge, &password_handle_buffer, &provided_password_buffer);
VerifyResponse response;
impl_->Verify(request, &response);
if (response.error == ERROR_RETRY) {
return response.retry_timeout;
} else if (response.error != ERROR_NONE) {
return -EINVAL;
}
if (auth_token != NULL && auth_token_length != NULL) {
*auth_token = response.auth_token.buffer.release();
*auth_token_length = response.auth_token.length;
}
if (request_reenroll != NULL) {
*request_reenroll = response.request_reenroll;
}
return 0;
}
} // namespace goldfish

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android/device/generic/goldfish/gatekeeper/SoftGateKeeperDevice.h Normal file
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/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SOFT_GATEKEEPER_DEVICE_H_
#define SOFT_GATEKEEPER_DEVICE_H_
#include "SoftGateKeeper.h"
#include <memory>
using namespace gatekeeper;
namespace goldfish {
/**
* Software based GateKeeper implementation
*/
class SoftGateKeeperDevice {
public:
SoftGateKeeperDevice() {
impl_.reset(new SoftGateKeeper());
}
// Wrappers to translate the gatekeeper HAL API to the Kegyuard Messages API.
/**
* Enrolls password_payload, which should be derived from a user selected pin or password,
* with the authentication factor private key used only for enrolling authentication
* factor data.
*
* Returns: 0 on success or an error code less than 0 on error.
* On error, enrolled_password_handle will not be allocated.
*/
int enroll(uint32_t uid,
const uint8_t *current_password_handle, uint32_t current_password_handle_length,
const uint8_t *current_password, uint32_t current_password_length,
const uint8_t *desired_password, uint32_t desired_password_length,
uint8_t **enrolled_password_handle, uint32_t *enrolled_password_handle_length);
/**
* Verifies provided_password matches enrolled_password_handle.
*
* Implementations of this module may retain the result of this call
* to attest to the recency of authentication.
*
* On success, writes the address of a verification token to auth_token,
* usable to attest password verification to other trusted services. Clients
* may pass NULL for this value.
*
* Returns: 0 on success or an error code less than 0 on error
* On error, verification token will not be allocated
*/
int verify(uint32_t uid, uint64_t challenge,
const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
const uint8_t *provided_password, uint32_t provided_password_length,
uint8_t **auth_token, uint32_t *auth_token_length, bool *request_reenroll);
private:
std::unique_ptr<SoftGateKeeper> impl_;
};
} // namespace gatekeeper
#endif //SOFT_GATEKEEPER_DEVICE_H_

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android/device/generic/goldfish/gatekeeper/module.cpp Normal file
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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hardware/hardware.h>
#include <hardware/gatekeeper.h>
#define LOG_TAG "GoldfishGatekeeper"
#include <cutils/log.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "SoftGateKeeper.h"
#include "SoftGateKeeperDevice.h"
using goldfish::SoftGateKeeperDevice;
struct goldfish_gatekeeper_device {
gatekeeper_device device;
SoftGateKeeperDevice *s_gatekeeper;
};
static goldfish_gatekeeper_device s_device;
static int enroll(const struct gatekeeper_device *dev __unused, uint32_t uid,
const uint8_t *current_password_handle, uint32_t current_password_handle_length,
const uint8_t *current_password, uint32_t current_password_length,
const uint8_t *desired_password, uint32_t desired_password_length,
uint8_t **enrolled_password_handle, uint32_t *enrolled_password_handle_length) {
SoftGateKeeperDevice *s_gatekeeper = ((goldfish_gatekeeper_device*)(dev))->s_gatekeeper;
ALOGE("called %s with gate keeper %p device %p\n", __func__, s_gatekeeper, dev);
if (s_gatekeeper == nullptr) {
abort();
return -EINVAL;
}
return s_gatekeeper->enroll(uid,
current_password_handle, current_password_handle_length,
current_password, current_password_length,
desired_password, desired_password_length,
enrolled_password_handle, enrolled_password_handle_length);
}
static int verify(const struct gatekeeper_device *dev __unused, uint32_t uid, uint64_t challenge,
const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
const uint8_t *provided_password, uint32_t provided_password_length,
uint8_t **auth_token, uint32_t *auth_token_length, bool *request_reenroll) {
SoftGateKeeperDevice *s_gatekeeper = ((goldfish_gatekeeper_device*)(dev))->s_gatekeeper;
ALOGE("called %s with gate keeper %p device %p\n", __func__, s_gatekeeper, dev);
if (s_gatekeeper == nullptr) return -EINVAL;
return s_gatekeeper->verify(uid, challenge,
enrolled_password_handle, enrolled_password_handle_length,
provided_password, provided_password_length,
auth_token, auth_token_length, request_reenroll);
}
static int close_device(hw_device_t* dev __unused) {
SoftGateKeeperDevice *s_gatekeeper = ((goldfish_gatekeeper_device*)(dev))->s_gatekeeper;
if (s_gatekeeper == nullptr) return 0;
delete s_gatekeeper;
s_gatekeeper = nullptr;
ALOGE("called %s with gate keeper %p device %p\n", __func__, s_gatekeeper, dev);
return 0;
}
static int goldfish_gatekeeper_open(const hw_module_t *module, const char *name,
hw_device_t **device) {
if (strcmp(name, HARDWARE_GATEKEEPER) != 0) {
abort();
return -EINVAL;
}
memset(&s_device, 0, sizeof(s_device));
SoftGateKeeperDevice *s_gatekeeper = new SoftGateKeeperDevice();
if (s_gatekeeper == nullptr) return -ENOMEM;
s_device.s_gatekeeper = s_gatekeeper;
s_device.device.common.tag = HARDWARE_DEVICE_TAG;
s_device.device.common.version = 1;
s_device.device.common.module = const_cast<hw_module_t *>(module);
s_device.device.common.close = close_device;
s_device.device.enroll = enroll;
s_device.device.verify = verify;
s_device.device.delete_user = nullptr;
s_device.device.delete_all_users = nullptr;
*device = &s_device.device.common;
ALOGE("called %s with gate keeper %p device %p\n", __func__, s_gatekeeper, *device);
return 0;
}
static struct hw_module_methods_t gatekeeper_module_methods = {
.open = goldfish_gatekeeper_open,
};
struct gatekeeper_module HAL_MODULE_INFO_SYM __attribute__((visibility("default"))) = {
.common = {
.tag = HARDWARE_MODULE_TAG,
.module_api_version = GATEKEEPER_MODULE_API_VERSION_0_1,
.hal_api_version = HARDWARE_HAL_API_VERSION,
.id = GATEKEEPER_HARDWARE_MODULE_ID,
.name = "Goldfish GateKeeper HAL",
.author = "The Android Open Source Project",
.methods = &gatekeeper_module_methods,
.dso = 0,
.reserved = {}
},
};