Dianne Hackborn | be7c50e | 2014-06-30 14:43:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 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 | |
| 17 | package com.android.server; |
| 18 | |
| 19 | import android.content.pm.FeatureInfo; |
| 20 | import android.os.*; |
| 21 | import android.os.Process; |
| 22 | import android.util.ArrayMap; |
| 23 | import android.util.ArraySet; |
| 24 | import android.util.Slog; |
| 25 | import android.util.SparseArray; |
| 26 | import android.util.Xml; |
| 27 | import com.android.internal.util.XmlUtils; |
| 28 | import org.xmlpull.v1.XmlPullParser; |
| 29 | import org.xmlpull.v1.XmlPullParserException; |
| 30 | |
| 31 | import java.io.File; |
| 32 | import java.io.FileNotFoundException; |
| 33 | import java.io.FileReader; |
| 34 | import java.io.IOException; |
| 35 | import java.util.HashMap; |
| 36 | import java.util.HashSet; |
| 37 | |
| 38 | import static com.android.internal.util.ArrayUtils.appendInt; |
| 39 | |
| 40 | /** |
| 41 | * Loads global system configuration info. |
| 42 | */ |
| 43 | public class SystemConfig { |
| 44 | static final String TAG = "SystemConfig"; |
| 45 | |
| 46 | static SystemConfig sInstance; |
| 47 | |
| 48 | // Group-ids that are given to all packages as read from etc/permissions/*.xml. |
| 49 | int[] mGlobalGids; |
| 50 | |
| 51 | // These are the built-in uid -> permission mappings that were read from the |
| 52 | // system configuration files. |
| 53 | final SparseArray<HashSet<String>> mSystemPermissions = |
| 54 | new SparseArray<HashSet<String>>(); |
| 55 | |
| 56 | // These are the built-in shared libraries that were read from the |
| 57 | // system configuration files. Keys are the library names; strings are the |
| 58 | // paths to the libraries. |
| 59 | final ArrayMap<String, String> mSharedLibraries |
| 60 | = new ArrayMap<String, String>(); |
| 61 | |
| 62 | // These are the features this devices supports that were read from the |
| 63 | // system configuration files. |
| 64 | final HashMap<String, FeatureInfo> mAvailableFeatures = |
| 65 | new HashMap<String, FeatureInfo>(); |
| 66 | |
| 67 | public static final class PermissionEntry { |
| 68 | public final String name; |
| 69 | public int[] gids; |
| 70 | |
| 71 | PermissionEntry(String _name) { |
| 72 | name = _name; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | // These are the permission -> gid mappings that were read from the |
| 77 | // system configuration files. |
| 78 | final ArrayMap<String, PermissionEntry> mPermissions = |
| 79 | new ArrayMap<String, PermissionEntry>(); |
| 80 | |
| 81 | // These are the packages that are white-listed to be able to run in the |
| 82 | // background while in power save mode, as read from the configuration files. |
| 83 | final ArraySet<String> mAllowInPowerSave = new ArraySet<String>(); |
| 84 | |
| 85 | public static SystemConfig getInstance() { |
| 86 | synchronized (SystemConfig.class) { |
| 87 | if (sInstance == null) { |
| 88 | sInstance = new SystemConfig(); |
| 89 | } |
| 90 | return sInstance; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | public int[] getGlobalGids() { |
| 95 | return mGlobalGids; |
| 96 | } |
| 97 | |
| 98 | public SparseArray<HashSet<String>> getSystemPermissions() { |
| 99 | return mSystemPermissions; |
| 100 | } |
| 101 | |
| 102 | public ArrayMap<String, String> getSharedLibraries() { |
| 103 | return mSharedLibraries; |
| 104 | } |
| 105 | |
| 106 | public HashMap<String, FeatureInfo> getAvailableFeatures() { |
| 107 | return mAvailableFeatures; |
| 108 | } |
| 109 | |
| 110 | public ArrayMap<String, PermissionEntry> getPermissions() { |
| 111 | return mPermissions; |
| 112 | } |
| 113 | |
| 114 | public ArraySet<String> getAllowInPowerSave() { |
| 115 | return mAllowInPowerSave; |
| 116 | } |
| 117 | |
| 118 | SystemConfig() { |
| 119 | // Read configuration from system |
| 120 | readPermissions(Environment.buildPath( |
| 121 | Environment.getRootDirectory(), "etc", "sysconfig"), false); |
| 122 | // Read configuration from the old permissions dir |
| 123 | readPermissions(Environment.buildPath( |
| 124 | Environment.getRootDirectory(), "etc", "permissions"), false); |
| 125 | // Only read features from OEM config |
| 126 | readPermissions(Environment.buildPath( |
| 127 | Environment.getOemDirectory(), "etc", "sysconfig"), true); |
| 128 | readPermissions(Environment.buildPath( |
| 129 | Environment.getOemDirectory(), "etc", "permissions"), true); |
| 130 | } |
| 131 | |
| 132 | void readPermissions(File libraryDir, boolean onlyFeatures) { |
| 133 | // Read permissions from given directory. |
| 134 | if (!libraryDir.exists() || !libraryDir.isDirectory()) { |
| 135 | if (!onlyFeatures) { |
| 136 | Slog.w(TAG, "No directory " + libraryDir + ", skipping"); |
| 137 | } |
| 138 | return; |
| 139 | } |
| 140 | if (!libraryDir.canRead()) { |
| 141 | Slog.w(TAG, "Directory " + libraryDir + " cannot be read"); |
| 142 | return; |
| 143 | } |
| 144 | |
| 145 | // Iterate over the files in the directory and scan .xml files |
| 146 | for (File f : libraryDir.listFiles()) { |
| 147 | // We'll read platform.xml last |
| 148 | if (f.getPath().endsWith("etc/permissions/platform.xml")) { |
| 149 | continue; |
| 150 | } |
| 151 | |
| 152 | if (!f.getPath().endsWith(".xml")) { |
| 153 | Slog.i(TAG, "Non-xml file " + f + " in " + libraryDir + " directory, ignoring"); |
| 154 | continue; |
| 155 | } |
| 156 | if (!f.canRead()) { |
| 157 | Slog.w(TAG, "Permissions library file " + f + " cannot be read"); |
| 158 | continue; |
| 159 | } |
| 160 | |
| 161 | readPermissionsFromXml(f, onlyFeatures); |
| 162 | } |
| 163 | |
| 164 | // Read permissions from .../etc/permissions/platform.xml last so it will take precedence |
| 165 | final File permFile = new File(Environment.getRootDirectory(), |
| 166 | "etc/permissions/platform.xml"); |
| 167 | readPermissionsFromXml(permFile, onlyFeatures); |
| 168 | } |
| 169 | |
| 170 | private void readPermissionsFromXml(File permFile, boolean onlyFeatures) { |
| 171 | FileReader permReader = null; |
| 172 | try { |
| 173 | permReader = new FileReader(permFile); |
| 174 | } catch (FileNotFoundException e) { |
| 175 | Slog.w(TAG, "Couldn't find or open permissions file " + permFile); |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | try { |
| 180 | XmlPullParser parser = Xml.newPullParser(); |
| 181 | parser.setInput(permReader); |
| 182 | |
| 183 | int type; |
| 184 | while ((type=parser.next()) != parser.START_TAG |
| 185 | && type != parser.END_DOCUMENT) { |
| 186 | ; |
| 187 | } |
| 188 | |
| 189 | if (type != parser.START_TAG) { |
| 190 | throw new XmlPullParserException("No start tag found"); |
| 191 | } |
| 192 | |
| 193 | if (!parser.getName().equals("permissions") && !parser.getName().equals("config")) { |
| 194 | throw new XmlPullParserException("Unexpected start tag: found " + parser.getName() + |
| 195 | ", expected 'permissions' or 'config'"); |
| 196 | } |
| 197 | |
| 198 | while (true) { |
| 199 | XmlUtils.nextElement(parser); |
| 200 | if (parser.getEventType() == XmlPullParser.END_DOCUMENT) { |
| 201 | break; |
| 202 | } |
| 203 | |
| 204 | String name = parser.getName(); |
| 205 | if ("group".equals(name) && !onlyFeatures) { |
| 206 | String gidStr = parser.getAttributeValue(null, "gid"); |
| 207 | if (gidStr != null) { |
| 208 | int gid = android.os.Process.getGidForName(gidStr); |
| 209 | mGlobalGids = appendInt(mGlobalGids, gid); |
| 210 | } else { |
| 211 | Slog.w(TAG, "<group> without gid at " |
| 212 | + parser.getPositionDescription()); |
| 213 | } |
| 214 | |
| 215 | XmlUtils.skipCurrentTag(parser); |
| 216 | continue; |
| 217 | } else if ("permission".equals(name) && !onlyFeatures) { |
| 218 | String perm = parser.getAttributeValue(null, "name"); |
| 219 | if (perm == null) { |
| 220 | Slog.w(TAG, "<permission> without name at " |
| 221 | + parser.getPositionDescription()); |
| 222 | XmlUtils.skipCurrentTag(parser); |
| 223 | continue; |
| 224 | } |
| 225 | perm = perm.intern(); |
| 226 | readPermission(parser, perm); |
| 227 | |
| 228 | } else if ("assign-permission".equals(name) && !onlyFeatures) { |
| 229 | String perm = parser.getAttributeValue(null, "name"); |
| 230 | if (perm == null) { |
| 231 | Slog.w(TAG, "<assign-permission> without name at " |
| 232 | + parser.getPositionDescription()); |
| 233 | XmlUtils.skipCurrentTag(parser); |
| 234 | continue; |
| 235 | } |
| 236 | String uidStr = parser.getAttributeValue(null, "uid"); |
| 237 | if (uidStr == null) { |
| 238 | Slog.w(TAG, "<assign-permission> without uid at " |
| 239 | + parser.getPositionDescription()); |
| 240 | XmlUtils.skipCurrentTag(parser); |
| 241 | continue; |
| 242 | } |
| 243 | int uid = Process.getUidForName(uidStr); |
| 244 | if (uid < 0) { |
| 245 | Slog.w(TAG, "<assign-permission> with unknown uid \"" |
| 246 | + uidStr + "\" at " |
| 247 | + parser.getPositionDescription()); |
| 248 | XmlUtils.skipCurrentTag(parser); |
| 249 | continue; |
| 250 | } |
| 251 | perm = perm.intern(); |
| 252 | HashSet<String> perms = mSystemPermissions.get(uid); |
| 253 | if (perms == null) { |
| 254 | perms = new HashSet<String>(); |
| 255 | mSystemPermissions.put(uid, perms); |
| 256 | } |
| 257 | perms.add(perm); |
| 258 | XmlUtils.skipCurrentTag(parser); |
| 259 | |
| 260 | } else if ("library".equals(name) && !onlyFeatures) { |
| 261 | String lname = parser.getAttributeValue(null, "name"); |
| 262 | String lfile = parser.getAttributeValue(null, "file"); |
| 263 | if (lname == null) { |
| 264 | Slog.w(TAG, "<library> without name at " |
| 265 | + parser.getPositionDescription()); |
| 266 | } else if (lfile == null) { |
| 267 | Slog.w(TAG, "<library> without file at " |
| 268 | + parser.getPositionDescription()); |
| 269 | } else { |
| 270 | //Log.i(TAG, "Got library " + lname + " in " + lfile); |
| 271 | mSharedLibraries.put(lname, lfile); |
| 272 | } |
| 273 | XmlUtils.skipCurrentTag(parser); |
| 274 | continue; |
| 275 | |
| 276 | } else if ("feature".equals(name)) { |
| 277 | String fname = parser.getAttributeValue(null, "name"); |
| 278 | if (fname == null) { |
| 279 | Slog.w(TAG, "<feature> without name at " |
| 280 | + parser.getPositionDescription()); |
| 281 | } else { |
| 282 | //Log.i(TAG, "Got feature " + fname); |
| 283 | FeatureInfo fi = new FeatureInfo(); |
| 284 | fi.name = fname; |
| 285 | mAvailableFeatures.put(fname, fi); |
| 286 | } |
| 287 | XmlUtils.skipCurrentTag(parser); |
| 288 | continue; |
| 289 | |
| 290 | } else if ("allow-in-power-save".equals(name)) { |
| 291 | String pkgname = parser.getAttributeValue(null, "package"); |
| 292 | if (pkgname == null) { |
| 293 | Slog.w(TAG, "<allow-in-power-save> without package at " |
| 294 | + parser.getPositionDescription()); |
| 295 | } else { |
| 296 | mAllowInPowerSave.add(pkgname); |
| 297 | } |
| 298 | XmlUtils.skipCurrentTag(parser); |
| 299 | continue; |
| 300 | |
| 301 | } else { |
| 302 | XmlUtils.skipCurrentTag(parser); |
| 303 | continue; |
| 304 | } |
| 305 | |
| 306 | } |
| 307 | permReader.close(); |
| 308 | } catch (XmlPullParserException e) { |
| 309 | Slog.w(TAG, "Got execption parsing permissions.", e); |
| 310 | } catch (IOException e) { |
| 311 | Slog.w(TAG, "Got execption parsing permissions.", e); |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | void readPermission(XmlPullParser parser, String name) |
| 316 | throws IOException, XmlPullParserException { |
| 317 | |
| 318 | name = name.intern(); |
| 319 | |
| 320 | PermissionEntry perm = mPermissions.get(name); |
| 321 | if (perm == null) { |
| 322 | perm = new PermissionEntry(name); |
| 323 | mPermissions.put(name, perm); |
| 324 | } |
| 325 | int outerDepth = parser.getDepth(); |
| 326 | int type; |
| 327 | while ((type=parser.next()) != XmlPullParser.END_DOCUMENT |
| 328 | && (type != XmlPullParser.END_TAG |
| 329 | || parser.getDepth() > outerDepth)) { |
| 330 | if (type == XmlPullParser.END_TAG |
| 331 | || type == XmlPullParser.TEXT) { |
| 332 | continue; |
| 333 | } |
| 334 | |
| 335 | String tagName = parser.getName(); |
| 336 | if ("group".equals(tagName)) { |
| 337 | String gidStr = parser.getAttributeValue(null, "gid"); |
| 338 | if (gidStr != null) { |
| 339 | int gid = Process.getGidForName(gidStr); |
| 340 | perm.gids = appendInt(perm.gids, gid); |
| 341 | } else { |
| 342 | Slog.w(TAG, "<group> without gid at " |
| 343 | + parser.getPositionDescription()); |
| 344 | } |
| 345 | } |
| 346 | XmlUtils.skipCurrentTag(parser); |
| 347 | } |
| 348 | } |
| 349 | } |