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Merge "Revert "[core][trusty] add gatekeeper module""

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Andres Morales 2015-09-16 22:54:14 +00:00 committed by Gerrit Code Review
commit 2b71daefb2
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50
trusty/gatekeeper/Android.mk
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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.
#
# WARNING: Everything listed here will be built on ALL platforms,
# including x86, the emulator, and the SDK. Modules must be uniquely
# named (liblights.panda), and must build everywhere, or limit themselves
# to only building on ARM if they include assembly. Individual makefiles
# are responsible for having their own logic, for fine-grained control.
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := gatekeeper.trusty
LOCAL_MODULE_RELATIVE_PATH := hw
LOCAL_SRC_FILES := \
module.cpp \
trusty_gatekeeper_ipc.c \
trusty_gatekeeper.cpp
LOCAL_CLFAGS = -fvisibility=hidden -Wall -Werror
LOCAL_SHARED_LIBRARIES := \
libgatekeeper \
liblog \
libcutils \
libtrusty
LOCAL_MODULE_TAGS := optional
# Symlink gatekeeper.trusty.so -> gatekeeper.<device>.so so libhardware can find it.
LOCAL_POST_INSTALL_CMD = \
$(hide) ln -sf $(notdir $(LOCAL_INSTALLED_MODULE)) $(dir $(LOCAL_INSTALLED_MODULE))gatekeeper.$(TARGET_DEVICE).so
include $(BUILD_SHARED_LIBRARY)

40
trusty/gatekeeper/gatekeeper_ipc.h
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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.
*/
#pragma once
#define GATEKEEPER_PORT "com.android.trusty.gatekeeper"
#define GATEKEEPER_MAX_BUFFER_LENGTH 1024
enum gatekeeper_command {
GK_REQ_SHIFT = 1,
GK_RESP_BIT = 1,
GK_ENROLL = (0 << GK_REQ_SHIFT),
GK_VERIFY = (1 << GK_REQ_SHIFT),
};
/**
* gatekeeper_message - Serial header for communicating with GK server
* @cmd: the command, one of ENROLL, VERIFY. Payload must be a serialized
* buffer of the corresponding request object.
* @payload: start of the serialized command specific payload
*/
struct gatekeeper_message {
uint32_t cmd;
uint8_t payload[0];
};

57
trusty/gatekeeper/module.cpp
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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 <string.h>
#include <errno.h>
#include <stdlib.h>
#include "trusty_gatekeeper.h"
using gatekeeper::TrustyGateKeeperDevice;
static int trusty_gatekeeper_open(const hw_module_t *module, const char *name,
hw_device_t **device) {
if (strcmp(name, HARDWARE_GATEKEEPER) != 0) {
return -EINVAL;
}
TrustyGateKeeperDevice *gatekeeper = new TrustyGateKeeperDevice(module);
if (gatekeeper == NULL) return -ENOMEM;
*device = gatekeeper->hw_device();
return 0;
}
static struct hw_module_methods_t gatekeeper_module_methods = {
.open = trusty_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 = "Trusty GateKeeper HAL",
.author = "The Android Open Source Project",
.methods = &gatekeeper_module_methods,
.dso = 0,
.reserved = {}
},
};

230
trusty/gatekeeper/trusty_gatekeeper.cpp
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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 <errno.h>
#include <stdio.h>
#include <assert.h>
#include <type_traits>
#include "trusty_gatekeeper.h"
#include "trusty_gatekeeper_ipc.h"
#include "gatekeeper_ipc.h"
#define LOG_TAG "TrustyGateKeeper"
#include <cutils/log.h>
namespace gatekeeper {
const uint32_t SEND_BUF_SIZE = 8192;
const uint32_t RECV_BUF_SIZE = 8192;
TrustyGateKeeperDevice::TrustyGateKeeperDevice(const hw_module_t *module) {
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
static_assert(std::is_standard_layout<TrustyGateKeeperDevice>::value,
"TrustyGateKeeperDevice must be standard layout");
static_assert(offsetof(TrustyGateKeeperDevice, device_) == 0,
"device_ must be the first member of TrustyGateKeeperDevice");
static_assert(offsetof(TrustyGateKeeperDevice, device_.common) == 0,
"common must be the first member of gatekeeper_device");
#else
assert(reinterpret_cast<gatekeeper_device_t *>(this) == &device_);
assert(reinterpret_cast<hw_device_t *>(this) == &(device_.common));
#endif
memset(&device_, 0, sizeof(device_));
device_.common.tag = HARDWARE_DEVICE_TAG;
device_.common.version = 1;
device_.common.module = const_cast<hw_module_t *>(module);
device_.common.close = close_device;
device_.enroll = enroll;
device_.verify = verify;
device_.delete_user = nullptr;
device_.delete_all_users = nullptr;
int rc = trusty_gatekeeper_connect();
if (rc < 0) {
ALOGE("Error initializing trusty session: %d", rc);
}
error_ = rc;
}
hw_device_t* TrustyGateKeeperDevice::hw_device() {
return &device_.common;
}
int TrustyGateKeeperDevice::close_device(hw_device_t* dev) {
delete reinterpret_cast<TrustyGateKeeperDevice *>(dev);
return 0;
}
TrustyGateKeeperDevice::~TrustyGateKeeperDevice() {
trusty_gatekeeper_disconnect();
}
int TrustyGateKeeperDevice::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 (error_ != 0) {
return error_;
}
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;
gatekeeper_error_t error = Send(request, &response);
if (error == ERROR_RETRY) {
return response.retry_timeout;
} else if (error != ERROR_NONE) {
return -EINVAL;
}
*enrolled_password_handle = response.enrolled_password_handle.buffer.release();
*enrolled_password_handle_length = response.enrolled_password_handle.length;
return 0;
}
int TrustyGateKeeperDevice::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 (error_ != 0) {
return error_;
}
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;
gatekeeper_error_t error = Send(request, &response);
if (error == ERROR_RETRY) {
return response.retry_timeout;
} else if (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;
}
gatekeeper_error_t TrustyGateKeeperDevice::Send(uint32_t command, const GateKeeperMessage& request,
GateKeeperMessage *response) {
uint32_t request_size = request.GetSerializedSize();
if (request_size > SEND_BUF_SIZE)
return ERROR_INVALID;
uint8_t send_buf[SEND_BUF_SIZE];
request.Serialize(send_buf, send_buf + request_size);
// Send it
uint8_t recv_buf[RECV_BUF_SIZE];
uint32_t response_size = RECV_BUF_SIZE;
int rc = trusty_gatekeeper_call(command, send_buf, request_size, recv_buf, &response_size);
if (rc < 0) {
ALOGE("error (%d) calling gatekeeper TA", rc);
return ERROR_INVALID;
}
const gatekeeper_message *msg = reinterpret_cast<gatekeeper_message *>(recv_buf);
const uint8_t *payload = msg->payload;
return response->Deserialize(payload, payload + response_size);
}
static inline TrustyGateKeeperDevice *convert_device(const gatekeeper_device *dev) {
return reinterpret_cast<TrustyGateKeeperDevice *>(const_cast<gatekeeper_device *>(dev));
}
/* static */
int TrustyGateKeeperDevice::enroll(const struct gatekeeper_device *dev, 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 (dev == NULL ||
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;
}
return convert_device(dev)->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 TrustyGateKeeperDevice::verify(const struct gatekeeper_device *dev, 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 (dev == NULL || enrolled_password_handle == NULL ||
provided_password == NULL) {
return -EINVAL;
}
return convert_device(dev)->Verify(uid, challenge, enrolled_password_handle,
enrolled_password_handle_length, provided_password, provided_password_length,
auth_token, auth_token_length, request_reenroll);
}
};

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trusty/gatekeeper/trusty_gatekeeper.h
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/*
* Copyright (C) 2014 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 TRUSTY_GATEKEEPER_H
#define TRUSTY_GATEKEEPER_H
#include <hardware/gatekeeper.h>
#include <gatekeeper/gatekeeper_messages.h>
#include "gatekeeper_ipc.h"
namespace gatekeeper {
class TrustyGateKeeperDevice {
public:
TrustyGateKeeperDevice(const hw_module_t* module);
~TrustyGateKeeperDevice();
hw_device_t* hw_device();
/**
* 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 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 expected_password after enrolling
* with the authentication factor private key.
*
* 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 verification_token,
*
* 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:
gatekeeper_error_t Send(uint32_t command, const GateKeeperMessage& request,
GateKeeperMessage* response);
gatekeeper_error_t Send(const EnrollRequest& request, EnrollResponse *response) {
return Send(GK_ENROLL, request, response);
}
gatekeeper_error_t Send(const VerifyRequest& request, VerifyResponse *response) {
return Send(GK_VERIFY, request, response);
}
// Static methods interfacing the HAL API with the TrustyGateKeeper device
/**
* Enrolls desired_password, which should be derived from a user selected pin or password,
* with the authentication factor private key used only for enrolling authentication
* factor data.
*
* If there was already a password enrolled, it should be provided in
* current_password_handle, along with the current password in current_password
* that should validate against current_password_handle.
*
* Returns: 0 on success or an error code less than 0 on error.
* On error, enrolled_password_handle will not be allocated.
*/
static int enroll(const struct gatekeeper_device *dev, 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
*/
static int verify(const struct gatekeeper_device *dev, 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);
static int close_device(hw_device_t* dev);
gatekeeper_device device_;
int error_;
};
}
#endif

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trusty/gatekeeper/trusty_gatekeeper_ipc.c
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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 <errno.h>
#include <stdlib.h>
#include <string.h>
#define LOG_TAG "TrustyGateKeeper"
#include <cutils/log.h>
#include <trusty/tipc.h>
#include "trusty_gatekeeper_ipc.h"
#include "gatekeeper_ipc.h"
#define TRUSTY_DEVICE_NAME "/dev/trusty-ipc-dev0"
static int handle_ = 0;
int trusty_gatekeeper_connect() {
int rc = tipc_connect(TRUSTY_DEVICE_NAME, GATEKEEPER_PORT);
if (rc < 0) {
return rc;
}
handle_ = rc;
return 0;
}
int trusty_gatekeeper_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
uint32_t *out_size) {
if (handle_ == 0) {
ALOGE("not connected\n");
return -EINVAL;
}
size_t msg_size = in_size + sizeof(struct gatekeeper_message);
struct gatekeeper_message *msg = malloc(msg_size);
msg->cmd = cmd;
memcpy(msg->payload, in, in_size);
ssize_t rc = write(handle_, msg, msg_size);
free(msg);
if (rc < 0) {
ALOGE("failed to send cmd (%d) to %s: %s\n", cmd,
GATEKEEPER_PORT, strerror(errno));
return -errno;
}
rc = read(handle_, out, *out_size);
if (rc < 0) {
ALOGE("failed to retrieve response for cmd (%d) to %s: %s\n",
cmd, GATEKEEPER_PORT, strerror(errno));
return -errno;
}
if ((size_t) rc < sizeof(struct gatekeeper_message)) {
ALOGE("invalid response size (%d)\n", (int) rc);
return -EINVAL;
}
msg = (struct gatekeeper_message *) out;
if ((cmd | GK_RESP_BIT) != msg->cmd) {
ALOGE("invalid command (%d)\n", msg->cmd);
return -EINVAL;
}
*out_size = ((size_t) rc) - sizeof(struct gatekeeper_message);
return rc;
}
void trusty_gatekeeper_disconnect() {
if (handle_ != 0) {
tipc_close(handle_);
}
}

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trusty/gatekeeper/trusty_gatekeeper_ipc.h
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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.
*/
__BEGIN_DECLS
int trusty_gatekeeper_connect();
int trusty_gatekeeper_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
uint32_t *out_size);
void trusty_gatekeeper_disconnect();
__END_DECLS