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_STATE_VCONF_KEY VCONFKEY_ODE_CRYPTO_STATE
  37 #define INTERNAL_OPTION_ONLY_USED_REGION_VCONF_KEY VCONFKEY_ODE_FAST_ENCRYPTION
  38
  39 namespace ode {
  40
  41 namespace {
  42
  43 VConfBackend vconfBackend(VCONFKEY_ODE_ENCRYPT_PROGRESS);
  44 ProgressBar progressBar(std::bind(&VConfBackend::update, &vconfBackend, std::placeholders::_1));
  45
  46 DMCryptEngine engine("/dev/mmcblk0p25", INTERNAL_STORAGE_PATH, progressBar);
  47
  48 void stopDependedSystemdServices()
  49 {
  50         dbus::Connection& systemDBus = dbus::Connection::getSystem();
  51         std::set<std::string> servicesToStop;
  52
  53         for (pid_t pid : runtime::FileUser::getList(INTERNAL_STORAGE_PATH, true)) {
  54                 try {
  55                         char *service;
  56                         systemDBus.methodcall("org.freedesktop.systemd1",
  57                                                                         "/org/freedesktop/systemd1",
  58                                                                         "org.freedesktop.systemd1.Manager",
  59                                                                         "GetUnitByPID",
  60                                                                         -1, "(o)", "(u)", (unsigned int)pid)
  61                                                                                 .get("(o)", &service);
  62                         servicesToStop.insert(service);
  63                 } catch (runtime::Exception &e) {
  64                         INFO("Close process - " + std::to_string(pid));
  65                         ::kill(pid, SIGKILL);
  66                 }
  67         }
  68
  69         for (const std::string& service : servicesToStop) {
  70                 INFO("Close service - " + service);
  71                 systemDBus.methodcall("org.freedesktop.systemd1",
  72                                                                 service,
  73                                                                 "org.freedesktop.systemd1.Unit",
  74                                                                 "Stop",
  75                                                                 -1, "", "(s)", "flush");
  76         }
  77 }
  78
  79 void showProgressUI(const std::string type) {
  80         std::vector<std::string> args = {
  81                 "ode", "progress", type, "Internal"
  82         };
  83
  84         runtime::Process proc("/usr/bin/ode", args);
  85         proc.execute();
  86 }
  87
  88 unsigned int getOptions()
  89 {
  90         unsigned int result = 0;
  91         int value;
  92
  93         value = 0;
  94         ::vconf_get_bool(INTERNAL_OPTION_ONLY_USED_REGION_VCONF_KEY, &value);
  95         if (value) {
  96                 result |= InternalEncryption::Option::IncludeUnusedRegion;
  97         }
  98
  99         return result;
 100 }
 101
 102 void setOptions(unsigned int options)
 103 {
 104         bool value;
 105
 106         if (options & InternalEncryption::Option::IncludeUnusedRegion) {
 107                 value = true;
 108         } else {
 109                 value = false;
 110         }
 111         ::vconf_set_bool(INTERNAL_OPTION_ONLY_USED_REGION_VCONF_KEY, value);
 112 }
 113
 114 }
 115
 116 InternalEncryption::InternalEncryption(ODEControlContext& ctx) :
 117         context(ctx)
 118 {
 119         context.registerNonparametricMethod(this, "", (int)(InternalEncryption::getState));
 120         context.registerNonparametricMethod(this, "", (unsigned int)(InternalEncryption::getSupportedOptions));
 121         context.registerParametricMethod(this, "", (int)(InternalEncryption::mount)(std::string));
 122         context.registerNonparametricMethod(this, "", (int)(InternalEncryption::umount));
 123         context.registerParametricMethod(this, "", (int)(InternalEncryption::encrypt)(std::string, unsigned int));
 124         context.registerParametricMethod(this, "", (int)(InternalEncryption::decrypt)(std::string));
 125         context.registerParametricMethod(this, "", (int)(InternalEncryption::changePassword)(std::string, std::string));
 126 }
 127
 128 InternalEncryption::~InternalEncryption()
 129 {
 130 }
 131
 132 int InternalEncryption::mount(const std::string& password)
 133 {
 134         if (getState() != State::Encrypted) {
 135                 return -1;
 136         }
 137
 138         KeyManager::data pwData(password.begin(), password.end());
 139         KeyManager keyManager(engine.getKeyMeta());
 140
 141         if (!keyManager.verifyPassword(pwData)) {
 142                 return -2;
 143         }
 144
 145         engine.mount(keyManager.getMasterKey(pwData), getOptions());
 146         return 0;
 147 }
 148
 149 int InternalEncryption::umount()
 150 {
 151         if (getState() != State::Encrypted) {
 152                 return -1;
 153         }
 154
 155         INFO("Close all processes using internal storage...");
 156         stopDependedSystemdServices();
 157         INFO("Umount internal storage...");
 158         engine.umount();
 159
 160         return 0;
 161 }
 162
 163 int InternalEncryption::encrypt(const std::string& password, unsigned int options)
 164 {
 165         if (getState() != State::Unencrypted) {
 166                 return -1;
 167         }
 168
 169         KeyManager::data pwData(password.begin(), password.end());
 170         KeyManager keyManager;
 171
 172         keyManager.initPassword(pwData);
 173         engine.setKeyMeta(keyManager.serialize());
 174
 175         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 176         auto encryptWorker = [&MasterKey, options, this]() {
 177                 showProgressUI("Encrypting");
 178
 179                 INFO("Close all processes using internal storage...");
 180                 stopDependedSystemdServices();
 181                 INFO("Umount internal storage...");
 182                 while (::umount(INTERNAL_STORAGE_PATH) == -1) {
 183                         if (errno != EBUSY) {
 184                                 break;
 185                         }
 186                 }
 187
 188                 INFO("Encryption started...");
 189                 ::vconf_set_str(INTERNAL_STATE_VCONF_KEY, "error_partially_encrypted");
 190                 engine.encrypt(MasterKey, options);
 191                 setOptions(options & getSupportedOptions());
 192                 INFO("Sync disk...");
 193                 sync();
 194                 INFO("Encryption completed");
 195
 196                 ::vconf_set_str(INTERNAL_STATE_VCONF_KEY, "encrypted");
 197                 ::reboot(RB_AUTOBOOT);
 198         };
 199
 200         std::thread asyncWork(encryptWorker);
 201         asyncWork.detach();
 202
 203         return 0;
 204 }
 205
 206 int InternalEncryption::decrypt(const std::string& password)
 207 {
 208         if (getState() != State::Encrypted) {
 209                 return -1;
 210         }
 211
 212         KeyManager::data pwData(password.begin(), password.end());
 213         KeyManager keyManager(engine.getKeyMeta());
 214
 215         if (!keyManager.verifyPassword(pwData)) {
 216                 return -2;
 217         }
 218
 219         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 220         auto decryptWorker = [MasterKey, this]() {
 221                 showProgressUI("Decrypting");
 222
 223                 INFO("Close all processes using internal storage...");
 224                 stopDependedSystemdServices();
 225                 INFO("Umount internal storage...");
 226                 try {
 227                         engine.umount();
 228                 } catch (runtime::Exception& e) {}
 229
 230                 INFO("Decryption started...");
 231                 ::vconf_set_str(INTERNAL_STATE_VCONF_KEY, "error_partially_encrypted");
 232                 engine.decrypt(MasterKey, getOptions());
 233                 INFO("Sync disk...");
 234                 sync();
 235                 INFO("Decryption completed");
 236
 237                 ::vconf_set_str(INTERNAL_STATE_VCONF_KEY, "unencrypted");
 238                 ::reboot(RB_AUTOBOOT);
 239         };
 240
 241         std::thread asyncWork(decryptWorker);
 242         asyncWork.detach();
 243
 244         return 0;
 245 }
 246
 247 int InternalEncryption::changePassword(const std::string& oldPassword,
 248                                                                                 const std::string& newPassword)
 249 {
 250         KeyManager::data oldPwData(oldPassword.begin(), oldPassword.end());
 251         KeyManager::data newPwData(newPassword.begin(), newPassword.end());
 252         KeyManager keyManager(engine.getKeyMeta());
 253
 254         if (!keyManager.verifyPassword(oldPwData)) {
 255                 return -2;
 256         }
 257
 258         keyManager.changePassword(oldPwData, newPwData);
 259         engine.setKeyMeta(keyManager.serialize());
 260
 261         return 0;
 262 }
 263
 264 int InternalEncryption::getState()
 265 {
 266         char *value = ::vconf_get_str(INTERNAL_STATE_VCONF_KEY);
 267         if (value == NULL) {
 268                 throw runtime::Exception("Failed to get vconf value");
 269         }
 270
 271         std::string valueStr(value);
 272         free(value);
 273
 274         if (valueStr == "encrypted") {
 275                 return State::Encrypted;
 276         } else if (valueStr == "unencrypted") {
 277                 return State::Unencrypted;
 278         } else {
 279                 return State::Corrupted;
 280         }
 281
 282         return 0;
 283 }
 284
 285 unsigned int InternalEncryption::getSupportedOptions()
 286 {
 287         return engine.getSupportedOptions();
 288 }
 289
 290 } // namespace ode