278 lines
10 KiB
C++
278 lines
10 KiB
C++
/*
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* Copyright (C) 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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#define LOG_TAG "gatekeeperd"
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#include "IGateKeeperService.h"
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#include <errno.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cutils/log.h>
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#include <utils/Log.h>
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#include <binder/IPCThreadState.h>
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#include <binder/IServiceManager.h>
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#include <binder/PermissionCache.h>
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#include <utils/String16.h>
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#include <keystore/IKeystoreService.h>
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#include <keystore/keystore.h> // For error code
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#include <gatekeeper/password_handle.h> // for password_handle_t
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#include <hardware/gatekeeper.h>
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#include <hardware/hw_auth_token.h>
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#include "SoftGateKeeperDevice.h"
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namespace android {
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static const String16 KEYGUARD_PERMISSION("android.permission.ACCESS_KEYGUARD_SECURE_STORAGE");
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static const String16 DUMP_PERMISSION("android.permission.DUMP");
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class GateKeeperProxy : public BnGateKeeperService {
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public:
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GateKeeperProxy() {
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int ret = hw_get_module_by_class(GATEKEEPER_HARDWARE_MODULE_ID, NULL, &module);
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if (ret < 0) {
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ALOGW("falling back to software GateKeeper");
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soft_device.reset(new SoftGateKeeperDevice());
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} else {
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ret = gatekeeper_open(module, &device);
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if (ret < 0)
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LOG_ALWAYS_FATAL_IF(ret < 0, "Unable to open GateKeeper HAL");
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}
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}
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virtual ~GateKeeperProxy() {
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if (device) gatekeeper_close(device);
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}
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void store_sid(uint32_t uid, uint64_t sid) {
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char filename[21];
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sprintf(filename, "%u", uid);
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int fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IWUSR);
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if (fd < 0) {
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ALOGE("could not open file: %s: %s", filename, strerror(errno));
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return;
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}
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write(fd, &sid, sizeof(sid));
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close(fd);
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}
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void maybe_store_sid(uint32_t uid, uint64_t sid) {
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char filename[21];
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sprintf(filename, "%u", uid);
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if (access(filename, F_OK) == -1) {
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store_sid(uid, sid);
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}
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}
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uint64_t read_sid(uint32_t uid) {
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char filename[21];
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uint64_t sid;
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sprintf(filename, "%u", uid);
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int fd = open(filename, O_RDONLY);
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if (fd < 0) return 0;
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read(fd, &sid, sizeof(sid));
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return sid;
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}
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void clear_sid(uint32_t uid) {
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char filename[21];
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sprintf(filename, "%u", uid);
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if (remove(filename) < 0) {
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ALOGE("%s: could not remove file [%s], attempting 0 write", __func__, strerror(errno));
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store_sid(uid, 0);
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}
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}
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virtual int enroll(uint32_t uid,
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const uint8_t *current_password_handle, uint32_t current_password_handle_length,
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const uint8_t *current_password, uint32_t current_password_length,
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const uint8_t *desired_password, uint32_t desired_password_length,
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uint8_t **enrolled_password_handle, uint32_t *enrolled_password_handle_length) {
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IPCThreadState* ipc = IPCThreadState::self();
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const int calling_pid = ipc->getCallingPid();
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const int calling_uid = ipc->getCallingUid();
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if (!PermissionCache::checkPermission(KEYGUARD_PERMISSION, calling_pid, calling_uid)) {
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return PERMISSION_DENIED;
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}
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// need a desired password to enroll
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if (desired_password_length == 0) return -EINVAL;
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int ret;
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if (device) {
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ret = device->enroll(device, uid,
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current_password_handle, current_password_handle_length,
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current_password, current_password_length,
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desired_password, desired_password_length,
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enrolled_password_handle, enrolled_password_handle_length);
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} else {
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ret = soft_device->enroll(uid,
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current_password_handle, current_password_handle_length,
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current_password, current_password_length,
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desired_password, desired_password_length,
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enrolled_password_handle, enrolled_password_handle_length);
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}
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if (ret == 0) {
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gatekeeper::password_handle_t *handle =
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reinterpret_cast<gatekeeper::password_handle_t *>(*enrolled_password_handle);
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store_sid(uid, handle->user_id);
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bool rr;
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// immediately verify this password so we don't ask the user to enter it again
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// if they just created it.
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verify(uid, *enrolled_password_handle, sizeof(password_handle_t), desired_password,
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desired_password_length, &rr);
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}
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return ret;
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}
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virtual int verify(uint32_t uid,
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const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
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const uint8_t *provided_password, uint32_t provided_password_length, bool *request_reenroll) {
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uint8_t *auth_token;
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uint32_t auth_token_length;
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return verifyChallenge(uid, 0, enrolled_password_handle, enrolled_password_handle_length,
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provided_password, provided_password_length,
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&auth_token, &auth_token_length, request_reenroll);
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}
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virtual int verifyChallenge(uint32_t uid, uint64_t challenge,
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const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
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const uint8_t *provided_password, uint32_t provided_password_length,
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uint8_t **auth_token, uint32_t *auth_token_length, bool *request_reenroll) {
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IPCThreadState* ipc = IPCThreadState::self();
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const int calling_pid = ipc->getCallingPid();
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const int calling_uid = ipc->getCallingUid();
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if (!PermissionCache::checkPermission(KEYGUARD_PERMISSION, calling_pid, calling_uid)) {
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return PERMISSION_DENIED;
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}
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// can't verify if we're missing either param
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if ((enrolled_password_handle_length | provided_password_length) == 0)
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return -EINVAL;
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int ret;
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if (device) {
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ret = device->verify(device, uid, challenge,
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enrolled_password_handle, enrolled_password_handle_length,
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provided_password, provided_password_length, auth_token, auth_token_length,
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request_reenroll);
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} else {
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ret = soft_device->verify(uid, challenge,
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enrolled_password_handle, enrolled_password_handle_length,
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provided_password, provided_password_length, auth_token, auth_token_length,
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request_reenroll);
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}
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if (ret == 0 && *auth_token != NULL && *auth_token_length > 0) {
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// TODO: cache service?
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sp<IServiceManager> sm = defaultServiceManager();
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sp<IBinder> binder = sm->getService(String16("android.security.keystore"));
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sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
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if (service != NULL) {
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status_t ret = service->addAuthToken(*auth_token, *auth_token_length);
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if (ret != ResponseCode::NO_ERROR) {
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ALOGE("Falure sending auth token to KeyStore: %d", ret);
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}
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} else {
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ALOGE("Unable to communicate with KeyStore");
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}
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}
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if (ret == 0) {
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maybe_store_sid(uid, reinterpret_cast<const gatekeeper::password_handle_t *>(
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enrolled_password_handle)->user_id);
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}
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return ret;
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}
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virtual uint64_t getSecureUserId(uint32_t uid) {
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return read_sid(uid);
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}
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virtual void clearSecureUserId(uint32_t uid) {
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IPCThreadState* ipc = IPCThreadState::self();
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const int calling_pid = ipc->getCallingPid();
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const int calling_uid = ipc->getCallingUid();
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if (!PermissionCache::checkPermission(KEYGUARD_PERMISSION, calling_pid, calling_uid)) {
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ALOGE("%s: permission denied for [%d:%d]", __func__, calling_pid, calling_uid);
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return;
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}
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clear_sid(uid);
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}
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virtual status_t dump(int fd, const Vector<String16> &) {
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IPCThreadState* ipc = IPCThreadState::self();
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const int pid = ipc->getCallingPid();
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const int uid = ipc->getCallingUid();
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if (!PermissionCache::checkPermission(DUMP_PERMISSION, pid, uid)) {
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return PERMISSION_DENIED;
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}
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if (device == NULL) {
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const char *result = "Device not available";
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write(fd, result, strlen(result) + 1);
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} else {
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const char *result = "OK";
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write(fd, result, strlen(result) + 1);
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}
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return NO_ERROR;
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}
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private:
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gatekeeper_device_t *device;
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UniquePtr<SoftGateKeeperDevice> soft_device;
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const hw_module_t *module;
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};
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}// namespace android
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int main(int argc, char* argv[]) {
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ALOGI("Starting gatekeeperd...");
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if (argc < 2) {
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ALOGE("A directory must be specified!");
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return 1;
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}
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if (chdir(argv[1]) == -1) {
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ALOGE("chdir: %s: %s", argv[1], strerror(errno));
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return 1;
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}
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android::sp<android::IServiceManager> sm = android::defaultServiceManager();
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android::sp<android::GateKeeperProxy> proxy = new android::GateKeeperProxy();
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android::status_t ret = sm->addService(
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android::String16("android.service.gatekeeper.IGateKeeperService"), proxy);
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if (ret != android::OK) {
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ALOGE("Couldn't register binder service!");
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return -1;
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}
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/*
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* We're the only thread in existence, so we're just going to process
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* Binder transaction as a single-threaded program.
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*/
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android::IPCThreadState::self()->joinThreadPool();
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return 0;
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}
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