server/internal-encryption.cpp

   1 /*
   2  *  Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License
  15  */
  16 #include <set>
  17
  18 #include <signal.h>
  19 #include <unistd.h>
  20 #include <sys/mount.h>
  21 #include <sys/reboot.h>
  22
  23 #include <vconf.h>
  24 #include <klay/process.h>
  25 #include <klay/file-user.h>
  26 #include <klay/filesystem.h>
  27 #include <klay/dbus/connection.h>
  28 #include <klay/audit/logger.h>
  29
  30 #include "engine/dmcrypt-engine.h"
  31 #include "key-manager/key-manager.h"
  32
  33 #include "rmi/internal-encryption.h"
  34
  35 #define INTERNAL_STORAGE_PATH   "/opt/usr"
  36 #define INTERNAL_STORAGE_VCONF_KEY VCONFKEY_ODE_CRYPTO_STATE
  37
  38 namespace ode {
  39
  40 namespace {
  41
  42 DMCryptEngine engine("/dev/mmcblk0p25", INTERNAL_STORAGE_PATH);
  43
  44 void stopDependedSystemdServices()
  45 {
  46         dbus::Connection& systemDBus = dbus::Connection::getSystem();
  47         std::set<std::string> servicesToStop;
  48
  49         for (pid_t pid : runtime::FileUser::getList(INTERNAL_STORAGE_PATH, true)) {
  50                 try {
  51                         char *service;
  52                         systemDBus.methodcall("org.freedesktop.systemd1",
  53                                                                         "/org/freedesktop/systemd1",
  54                                                                         "org.freedesktop.systemd1.Manager",
  55                                                                         "GetUnitByPID",
  56                                                                         -1, "(o)", "(u)", (unsigned int)pid)
  57                                                                                 .get("(o)", &service);
  58                         servicesToStop.insert(service);
  59                 } catch (runtime::Exception &e) {
  60                         INFO("Close process - " + std::to_string(pid));
  61                         ::kill(pid, SIGKILL);
  62                 }
  63         }
  64
  65         for (const std::string& service : servicesToStop) {
  66                 INFO("Close service - " + service);
  67                 systemDBus.methodcall("org.freedesktop.systemd1",
  68                                                                 service,
  69                                                                 "org.freedesktop.systemd1.Unit",
  70                                                                 "Stop",
  71                                                                 -1, "", "(s)", "flush");
  72         }
  73 }
  74
  75 void showProgressUI(const std::string type) {
  76         std::vector<std::string> args = {
  77                 "ode-gui", "progress", type, "Internal storage encryption"
  78         };
  79
  80         runtime::Process proc("/usr/bin/ode-gui", args);
  81         proc.execute();
  82 }
  83
  84 }
  85
  86 InternalEncryption::InternalEncryption(ODEControlContext& ctx) :
  87         context(ctx)
  88 {
  89         context.registerParametricMethod(this, "", (int)(InternalEncryption::mount)(std::string));
  90         context.registerNonparametricMethod(this, "", (int)(InternalEncryption::umount));
  91         context.registerParametricMethod(this, "", (int)(InternalEncryption::encrypt)(std::string));
  92         context.registerParametricMethod(this, "", (int)(InternalEncryption::decrypt)(std::string));
  93         context.registerParametricMethod(this, "", (int)(InternalEncryption::changePassword)(std::string, std::string));
  94         context.registerNonparametricMethod(this, "", (int)(InternalEncryption::getState));
  95 }
  96
  97 InternalEncryption::~InternalEncryption()
  98 {
  99 }
 100
 101 int InternalEncryption::mount(const std::string& password)
 102 {
 103         if (getState() != State::Encrypted) {
 104                 return -1;
 105         }
 106
 107         KeyManager::data pwData(password.begin(), password.end());
 108         KeyManager keyManager(engine.getKeyMeta());
 109
 110         if (!keyManager.verifyPassword(pwData)) {
 111                 return -2;
 112         }
 113
 114         engine.mount(keyManager.getMasterKey(pwData));
 115         return 0;
 116 }
 117
 118 int InternalEncryption::umount()
 119 {
 120         if (getState() != State::Encrypted) {
 121                 return -1;
 122         }
 123
 124         INFO("Close all processes using internal storage...");
 125         stopDependedSystemdServices();
 126         INFO("Umount internal storage...");
 127         engine.umount();
 128
 129         return 0;
 130 }
 131
 132 int InternalEncryption::encrypt(const std::string& password)
 133 {
 134         if (getState() != State::Unencrypted) {
 135                 return -1;
 136         }
 137
 138         KeyManager::data pwData(password.begin(), password.end());
 139         KeyManager keyManager;
 140
 141         keyManager.initPassword(pwData);
 142         engine.setKeyMeta(keyManager.serialize());
 143
 144         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 145         auto encryptWorker = [MasterKey, this]() {
 146                 showProgressUI("Encrypting");
 147
 148                 INFO("Close all processes using internal storage...");
 149                 stopDependedSystemdServices();
 150                 INFO("Umount internal storage...");
 151                 while (::umount(INTERNAL_STORAGE_PATH) == -1) {
 152                         if (errno != EBUSY) {
 153                                 break;
 154                         }
 155                 }
 156
 157                 INFO("Encryption started...");
 158                 ::vconf_set_str(INTERNAL_STORAGE_VCONF_KEY, "error_partially_encrypted");
 159                 engine.encrypt(MasterKey);
 160                 INFO("Sync disk...");
 161                 sync();
 162                 INFO("Encryption completed");
 163
 164                 ::vconf_set_str(INTERNAL_STORAGE_VCONF_KEY, "encrypted");
 165                 ::reboot(RB_AUTOBOOT);
 166         };
 167
 168         std::thread asyncWork(encryptWorker);
 169         asyncWork.detach();
 170
 171         return 0;
 172 }
 173
 174 int InternalEncryption::decrypt(const std::string& password)
 175 {
 176         if (getState() != State::Encrypted) {
 177                 return -1;
 178         }
 179
 180         KeyManager::data pwData(password.begin(), password.end());
 181         KeyManager keyManager(engine.getKeyMeta());
 182
 183         if (!keyManager.verifyPassword(pwData)) {
 184                 return -2;
 185         }
 186
 187         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 188         auto decryptWorker = [MasterKey, this]() {
 189                 showProgressUI("Decrypting");
 190
 191                 INFO("Close all processes using internal storage...");
 192                 stopDependedSystemdServices();
 193                 INFO("Umount internal storage...");
 194                 try {
 195                         engine.umount();
 196                 } catch (runtime::Exception& e) {}
 197
 198                 INFO("Decryption started...");
 199                 ::vconf_set_str(INTERNAL_STORAGE_VCONF_KEY, "error_partially_encrypted");
 200                 engine.decrypt(MasterKey);
 201                 INFO("Sync disk...");
 202                 sync();
 203                 INFO("Decryption completed");
 204
 205                 ::vconf_set_str(INTERNAL_STORAGE_VCONF_KEY, "unencrypted");
 206                 ::reboot(RB_AUTOBOOT);
 207         };
 208
 209         std::thread asyncWork(decryptWorker);
 210         asyncWork.detach();
 211
 212         return 0;
 213 }
 214
 215 int InternalEncryption::changePassword(const std::string& oldPassword,
 216                                                                                 const std::string& newPassword)
 217 {
 218         KeyManager::data oldPwData(oldPassword.begin(), oldPassword.end());
 219         KeyManager::data newPwData(newPassword.begin(), newPassword.end());
 220         KeyManager keyManager(engine.getKeyMeta());
 221
 222         if (!keyManager.verifyPassword(oldPwData)) {
 223                 return -2;
 224         }
 225
 226         keyManager.changePassword(oldPwData, newPwData);
 227         engine.setKeyMeta(keyManager.serialize());
 228
 229         return 0;
 230 }
 231
 232 int InternalEncryption::getState()
 233 {
 234         char *value = ::vconf_get_str(INTERNAL_STORAGE_VCONF_KEY);
 235         if (value == NULL) {
 236                 throw runtime::Exception("Failed to get vconf value");
 237         }
 238
 239         std::string valueStr(value);
 240         free(value);
 241
 242         if (valueStr == "encrypted") {
 243                 return State::Encrypted;
 244         } else if (valueStr == "unencrypted") {
 245                 return State::Unencrypted;
 246         } else {
 247                 return State::Corrupted;
 248         }
 249
 250         return 0;
 251 }
 252
 253 } // namespace ode