1 /* 2 * Copyright (C) 2011 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.internal.telephony; 18 19 import android.compat.annotation.UnsupportedAppUsage; 20 import android.content.ContentResolver; 21 import android.content.Context; 22 import android.content.pm.ApplicationInfo; 23 import android.content.pm.PackageManager.NameNotFoundException; 24 import android.content.res.XmlResourceParser; 25 import android.database.ContentObserver; 26 import android.os.Binder; 27 import android.os.Handler; 28 import android.os.Process; 29 import android.os.UserHandle; 30 import android.provider.Settings; 31 import android.telephony.PhoneNumberUtils; 32 import android.telephony.SmsManager; 33 import android.util.AtomicFile; 34 import android.util.Xml; 35 36 import com.android.internal.telephony.util.XmlUtils; 37 import com.android.internal.util.FastXmlSerializer; 38 import com.android.telephony.Rlog; 39 40 import org.xmlpull.v1.XmlPullParser; 41 import org.xmlpull.v1.XmlPullParserException; 42 import org.xmlpull.v1.XmlSerializer; 43 44 import java.io.File; 45 import java.io.FileInputStream; 46 import java.io.FileNotFoundException; 47 import java.io.FileOutputStream; 48 import java.io.FileReader; 49 import java.io.IOException; 50 import java.nio.charset.StandardCharsets; 51 import java.util.ArrayList; 52 import java.util.HashMap; 53 import java.util.Iterator; 54 import java.util.Map; 55 import java.util.concurrent.atomic.AtomicBoolean; 56 import java.util.regex.Pattern; 57 58 /** 59 * Implement the per-application based SMS control, which limits the number of 60 * SMS/MMS messages an app can send in the checking period. 61 * 62 * This code was formerly part of {@link SMSDispatcher}, and has been moved 63 * into a separate class to support instantiation of multiple SMSDispatchers on 64 * dual-mode devices that require support for both 3GPP and 3GPP2 format messages. 65 */ 66 public class SmsUsageMonitor { 67 private static final String TAG = "SmsUsageMonitor"; 68 private static final boolean DBG = false; 69 private static final boolean VDBG = false; 70 71 private static final String SHORT_CODE_PATH = "/data/misc/sms/codes"; 72 73 /** Default checking period for SMS sent without user permission. */ 74 private static final int DEFAULT_SMS_CHECK_PERIOD = 60000; // 1 minute 75 76 /** Default number of SMS sent in checking period without user permission. */ 77 private static final int DEFAULT_SMS_MAX_COUNT = 30; 78 79 /** @hide */ mergeShortCodeCategories(int type1, int type2)80 public static int mergeShortCodeCategories(int type1, int type2) { 81 if (type1 > type2) return type1; 82 return type2; 83 } 84 85 /** Premium SMS permission for a new package (ask user when first premium SMS sent). */ 86 public static final int PREMIUM_SMS_PERMISSION_UNKNOWN = 0; 87 88 /** Default premium SMS permission (ask user for each premium SMS sent). */ 89 public static final int PREMIUM_SMS_PERMISSION_ASK_USER = 1; 90 91 /** Premium SMS permission when the owner has denied the app from sending premium SMS. */ 92 public static final int PREMIUM_SMS_PERMISSION_NEVER_ALLOW = 2; 93 94 /** Premium SMS permission when the owner has allowed the app to send premium SMS. */ 95 public static final int PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW = 3; 96 97 private final int mCheckPeriod; 98 private final int mMaxAllowed; 99 100 private final HashMap<String, ArrayList<Long>> mSmsStamp = 101 new HashMap<String, ArrayList<Long>>(); 102 103 /** Context for retrieving regexes from XML resource. */ 104 private final Context mContext; 105 106 /** Country code for the cached short code pattern matcher. */ 107 private String mCurrentCountry; 108 109 /** Cached short code pattern matcher for {@link #mCurrentCountry}. */ 110 private ShortCodePatternMatcher mCurrentPatternMatcher; 111 112 /** Notice when the enabled setting changes - can be changed through gservices */ 113 private final AtomicBoolean mCheckEnabled = new AtomicBoolean(true); 114 115 /** Handler for responding to content observer updates. */ 116 private final SettingsObserverHandler mSettingsObserverHandler; 117 118 /** File holding the patterns */ 119 private final File mPatternFile = new File(SHORT_CODE_PATH); 120 121 /** Last modified time for pattern file */ 122 private long mPatternFileLastModified = 0; 123 124 /** Directory for per-app SMS permission XML file. */ 125 private static final String SMS_POLICY_FILE_DIRECTORY = "/data/misc/sms"; 126 127 /** Per-app SMS permission XML filename. */ 128 private static final String SMS_POLICY_FILE_NAME = "premium_sms_policy.xml"; 129 130 /** XML tag for root element. */ 131 private static final String TAG_SHORTCODES = "shortcodes"; 132 133 /** XML tag for short code patterns for a specific country. */ 134 private static final String TAG_SHORTCODE = "shortcode"; 135 136 /** XML attribute for the country code. */ 137 private static final String ATTR_COUNTRY = "country"; 138 139 /** XML attribute for the short code regex pattern. */ 140 private static final String ATTR_PATTERN = "pattern"; 141 142 /** XML attribute for the premium short code regex pattern. */ 143 private static final String ATTR_PREMIUM = "premium"; 144 145 /** XML attribute for the free short code regex pattern. */ 146 private static final String ATTR_FREE = "free"; 147 148 /** XML attribute for the standard rate short code regex pattern. */ 149 private static final String ATTR_STANDARD = "standard"; 150 151 /** Stored copy of premium SMS package permissions. */ 152 private AtomicFile mPolicyFile; 153 154 /** Loaded copy of premium SMS package permissions. */ 155 private final HashMap<String, Integer> mPremiumSmsPolicy = new HashMap<String, Integer>(); 156 157 /** XML tag for root element of premium SMS permissions. */ 158 private static final String TAG_SMS_POLICY_BODY = "premium-sms-policy"; 159 160 /** XML tag for a package. */ 161 private static final String TAG_PACKAGE = "package"; 162 163 /** XML attribute for the package name. */ 164 private static final String ATTR_PACKAGE_NAME = "name"; 165 166 /** XML attribute for the package's premium SMS permission (integer type). */ 167 private static final String ATTR_PACKAGE_SMS_POLICY = "sms-policy"; 168 169 /** 170 * SMS short code regex pattern matcher for a specific country. 171 */ 172 private static final class ShortCodePatternMatcher { 173 private final Pattern mShortCodePattern; 174 private final Pattern mPremiumShortCodePattern; 175 private final Pattern mFreeShortCodePattern; 176 private final Pattern mStandardShortCodePattern; 177 ShortCodePatternMatcher(String shortCodeRegex, String premiumShortCodeRegex, String freeShortCodeRegex, String standardShortCodeRegex)178 ShortCodePatternMatcher(String shortCodeRegex, String premiumShortCodeRegex, 179 String freeShortCodeRegex, String standardShortCodeRegex) { 180 mShortCodePattern = (shortCodeRegex != null ? Pattern.compile(shortCodeRegex) : null); 181 mPremiumShortCodePattern = (premiumShortCodeRegex != null ? 182 Pattern.compile(premiumShortCodeRegex) : null); 183 mFreeShortCodePattern = (freeShortCodeRegex != null ? 184 Pattern.compile(freeShortCodeRegex) : null); 185 mStandardShortCodePattern = (standardShortCodeRegex != null ? 186 Pattern.compile(standardShortCodeRegex) : null); 187 } 188 getNumberCategory(String phoneNumber)189 int getNumberCategory(String phoneNumber) { 190 if (mFreeShortCodePattern != null && mFreeShortCodePattern.matcher(phoneNumber) 191 .matches()) { 192 return SmsManager.SMS_CATEGORY_FREE_SHORT_CODE; 193 } 194 if (mStandardShortCodePattern != null && mStandardShortCodePattern.matcher(phoneNumber) 195 .matches()) { 196 return SmsManager.SMS_CATEGORY_STANDARD_SHORT_CODE; 197 } 198 if (mPremiumShortCodePattern != null && mPremiumShortCodePattern.matcher(phoneNumber) 199 .matches()) { 200 return SmsManager.SMS_CATEGORY_PREMIUM_SHORT_CODE; 201 } 202 if (mShortCodePattern != null && mShortCodePattern.matcher(phoneNumber).matches()) { 203 return SmsManager.SMS_CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE; 204 } 205 return SmsManager.SMS_CATEGORY_NOT_SHORT_CODE; 206 } 207 } 208 209 /** 210 * Observe the secure setting for enable flag 211 */ 212 private static class SettingsObserver extends ContentObserver { 213 private final Context mContext; 214 private final AtomicBoolean mEnabled; 215 SettingsObserver(Handler handler, Context context, AtomicBoolean enabled)216 SettingsObserver(Handler handler, Context context, AtomicBoolean enabled) { 217 super(handler); 218 mContext = context; 219 mEnabled = enabled; 220 onChange(false); 221 } 222 223 @Override onChange(boolean selfChange)224 public void onChange(boolean selfChange) { 225 mEnabled.set(Settings.Global.getInt(mContext.getContentResolver(), 226 Settings.Global.SMS_SHORT_CODE_CONFIRMATION, 1) != 0); 227 } 228 } 229 230 private static class SettingsObserverHandler extends Handler { SettingsObserverHandler(Context context, AtomicBoolean enabled)231 SettingsObserverHandler(Context context, AtomicBoolean enabled) { 232 ContentResolver resolver = context.getContentResolver(); 233 ContentObserver globalObserver = new SettingsObserver(this, context, enabled); 234 resolver.registerContentObserver(Settings.Global.getUriFor( 235 Settings.Global.SMS_SHORT_CODE_CONFIRMATION), false, globalObserver); 236 } 237 } 238 239 /** 240 * Create SMS usage monitor. 241 * @param context the context to use to load resources and get TelephonyManager service 242 */ 243 @UnsupportedAppUsage SmsUsageMonitor(Context context)244 public SmsUsageMonitor(Context context) { 245 mContext = context; 246 ContentResolver resolver = context.getContentResolver(); 247 248 mMaxAllowed = Settings.Global.getInt(resolver, 249 Settings.Global.SMS_OUTGOING_CHECK_MAX_COUNT, 250 DEFAULT_SMS_MAX_COUNT); 251 252 mCheckPeriod = Settings.Global.getInt(resolver, 253 Settings.Global.SMS_OUTGOING_CHECK_INTERVAL_MS, 254 DEFAULT_SMS_CHECK_PERIOD); 255 256 mSettingsObserverHandler = new SettingsObserverHandler(mContext, mCheckEnabled); 257 258 loadPremiumSmsPolicyDb(); 259 } 260 261 /** 262 * Return a pattern matcher object for the specified country. 263 * @param country the country to search for 264 * @return a {@link ShortCodePatternMatcher} for the specified country, or null if not found 265 */ getPatternMatcherFromFile(String country)266 private ShortCodePatternMatcher getPatternMatcherFromFile(String country) { 267 FileReader patternReader = null; 268 XmlPullParser parser = null; 269 try { 270 patternReader = new FileReader(mPatternFile); 271 parser = Xml.newPullParser(); 272 parser.setInput(patternReader); 273 return getPatternMatcherFromXmlParser(parser, country); 274 } catch (FileNotFoundException e) { 275 Rlog.e(TAG, "Short Code Pattern File not found"); 276 } catch (XmlPullParserException e) { 277 Rlog.e(TAG, "XML parser exception reading short code pattern file", e); 278 } finally { 279 mPatternFileLastModified = mPatternFile.lastModified(); 280 if (patternReader != null) { 281 try { 282 patternReader.close(); 283 } catch (IOException e) {} 284 } 285 } 286 return null; 287 } 288 getPatternMatcherFromResource(String country)289 private ShortCodePatternMatcher getPatternMatcherFromResource(String country) { 290 int id = com.android.internal.R.xml.sms_short_codes; 291 XmlResourceParser parser = null; 292 try { 293 parser = mContext.getResources().getXml(id); 294 return getPatternMatcherFromXmlParser(parser, country); 295 } finally { 296 if (parser != null) parser.close(); 297 } 298 } 299 getPatternMatcherFromXmlParser(XmlPullParser parser, String country)300 private ShortCodePatternMatcher getPatternMatcherFromXmlParser(XmlPullParser parser, 301 String country) { 302 try { 303 XmlUtils.beginDocument(parser, TAG_SHORTCODES); 304 305 while (true) { 306 XmlUtils.nextElement(parser); 307 String element = parser.getName(); 308 if (element == null) { 309 Rlog.e(TAG, "Parsing pattern data found null"); 310 break; 311 } 312 313 if (element.equals(TAG_SHORTCODE)) { 314 String currentCountry = parser.getAttributeValue(null, ATTR_COUNTRY); 315 if (VDBG) Rlog.d(TAG, "Found country " + currentCountry); 316 if (country.equals(currentCountry)) { 317 String pattern = parser.getAttributeValue(null, ATTR_PATTERN); 318 String premium = parser.getAttributeValue(null, ATTR_PREMIUM); 319 String free = parser.getAttributeValue(null, ATTR_FREE); 320 String standard = parser.getAttributeValue(null, ATTR_STANDARD); 321 return new ShortCodePatternMatcher(pattern, premium, free, standard); 322 } 323 } else { 324 Rlog.e(TAG, "Error: skipping unknown XML tag " + element); 325 } 326 } 327 } catch (XmlPullParserException e) { 328 Rlog.e(TAG, "XML parser exception reading short code patterns", e); 329 } catch (IOException e) { 330 Rlog.e(TAG, "I/O exception reading short code patterns", e); 331 } 332 if (DBG) Rlog.d(TAG, "Country (" + country + ") not found"); 333 return null; // country not found 334 } 335 336 /** Clear the SMS application list for disposal. */ dispose()337 void dispose() { 338 mSmsStamp.clear(); 339 } 340 341 /** 342 * Check to see if an application is allowed to send new SMS messages, and confirm with 343 * user if the send limit was reached or if a non-system app is potentially sending to a 344 * premium SMS short code or number. 345 * 346 * @param appName the package name of the app requesting to send an SMS 347 * @param smsWaiting the number of new messages desired to send 348 * @return true if application is allowed to send the requested number 349 * of new sms messages 350 */ 351 @UnsupportedAppUsage check(String appName, int smsWaiting)352 public boolean check(String appName, int smsWaiting) { 353 synchronized (mSmsStamp) { 354 removeExpiredTimestamps(); 355 356 ArrayList<Long> sentList = mSmsStamp.get(appName); 357 if (sentList == null) { 358 sentList = new ArrayList<Long>(); 359 mSmsStamp.put(appName, sentList); 360 } 361 362 return isUnderLimit(sentList, smsWaiting); 363 } 364 } 365 366 /** 367 * Check if the destination is a possible premium short code. 368 * NOTE: the caller is expected to strip non-digits from the destination number with 369 * {@link PhoneNumberUtils#extractNetworkPortion} before calling this method. 370 * This happens in {@link SMSDispatcher#sendRawPdu} so that we use the same phone number 371 * for testing and in the user confirmation dialog if the user needs to confirm the number. 372 * This makes it difficult for malware to fool the user or the short code pattern matcher 373 * by using non-ASCII characters to make the number appear to be different from the real 374 * destination phone number. 375 * 376 * @param destAddress the destination address to test for possible short code 377 * @return {@link SmsManager#SMS_CATEGORY_FREE_SHORT_CODE}, 378 * {@link SmsManager#SMS_CATEGORY_NOT_SHORT_CODE}, 379 * {@link SmsManager#SMS_CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE}, 380 * {@link SmsManager#SMS_CATEGORY_STANDARD_SHORT_CODE}, or 381 * {@link SmsManager#SMS_CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE} 382 */ checkDestination(String destAddress, String countryIso)383 public int checkDestination(String destAddress, String countryIso) { 384 synchronized (mSettingsObserverHandler) { 385 // always allow emergency numbers 386 if (PhoneNumberUtils.isEmergencyNumber(destAddress, countryIso)) { 387 if (DBG) Rlog.d(TAG, "isEmergencyNumber"); 388 return SmsManager.SMS_CATEGORY_NOT_SHORT_CODE; 389 } 390 // always allow if the feature is disabled 391 if (!mCheckEnabled.get()) { 392 if (DBG) Rlog.e(TAG, "check disabled"); 393 return SmsManager.SMS_CATEGORY_NOT_SHORT_CODE; 394 } 395 396 if (countryIso != null) { 397 if (mCurrentCountry == null || !countryIso.equals(mCurrentCountry) || 398 mPatternFile.lastModified() != mPatternFileLastModified) { 399 if (mPatternFile.exists()) { 400 if (DBG) Rlog.d(TAG, "Loading SMS Short Code patterns from file"); 401 mCurrentPatternMatcher = getPatternMatcherFromFile(countryIso); 402 } else { 403 if (DBG) Rlog.d(TAG, "Loading SMS Short Code patterns from resource"); 404 mCurrentPatternMatcher = getPatternMatcherFromResource(countryIso); 405 } 406 mCurrentCountry = countryIso; 407 } 408 } 409 410 if (mCurrentPatternMatcher != null) { 411 return mCurrentPatternMatcher.getNumberCategory(destAddress); 412 } else { 413 // Generic rule: numbers of 5 digits or less are considered potential short codes 414 Rlog.e(TAG, "No patterns for \"" + countryIso + "\": using generic short code rule"); 415 if (destAddress.length() <= 5) { 416 return SmsManager.SMS_CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE; 417 } else { 418 return SmsManager.SMS_CATEGORY_NOT_SHORT_CODE; 419 } 420 } 421 } 422 } 423 424 /** 425 * Load the premium SMS policy from an XML file. 426 * Based on code from NotificationManagerService. 427 */ loadPremiumSmsPolicyDb()428 private void loadPremiumSmsPolicyDb() { 429 synchronized (mPremiumSmsPolicy) { 430 if (mPolicyFile == null) { 431 File dir = new File(SMS_POLICY_FILE_DIRECTORY); 432 mPolicyFile = new AtomicFile(new File(dir, SMS_POLICY_FILE_NAME)); 433 434 mPremiumSmsPolicy.clear(); 435 436 FileInputStream infile = null; 437 try { 438 infile = mPolicyFile.openRead(); 439 final XmlPullParser parser = Xml.newPullParser(); 440 parser.setInput(infile, StandardCharsets.UTF_8.name()); 441 442 XmlUtils.beginDocument(parser, TAG_SMS_POLICY_BODY); 443 444 while (true) { 445 XmlUtils.nextElement(parser); 446 447 String element = parser.getName(); 448 if (element == null) break; 449 450 if (element.equals(TAG_PACKAGE)) { 451 String packageName = parser.getAttributeValue(null, ATTR_PACKAGE_NAME); 452 String policy = parser.getAttributeValue(null, ATTR_PACKAGE_SMS_POLICY); 453 if (packageName == null) { 454 Rlog.e(TAG, "Error: missing package name attribute"); 455 } else if (policy == null) { 456 Rlog.e(TAG, "Error: missing package policy attribute"); 457 } else try { 458 mPremiumSmsPolicy.put(packageName, Integer.parseInt(policy)); 459 } catch (NumberFormatException e) { 460 Rlog.e(TAG, "Error: non-numeric policy type " + policy); 461 } 462 } else { 463 Rlog.e(TAG, "Error: skipping unknown XML tag " + element); 464 } 465 } 466 } catch (FileNotFoundException e) { 467 // No data yet 468 } catch (IOException e) { 469 Rlog.e(TAG, "Unable to read premium SMS policy database", e); 470 } catch (NumberFormatException e) { 471 Rlog.e(TAG, "Unable to parse premium SMS policy database", e); 472 } catch (XmlPullParserException e) { 473 Rlog.e(TAG, "Unable to parse premium SMS policy database", e); 474 } finally { 475 if (infile != null) { 476 try { 477 infile.close(); 478 } catch (IOException ignored) { 479 } 480 } 481 } 482 } 483 } 484 } 485 486 /** 487 * Persist the premium SMS policy to an XML file. 488 * Based on code from NotificationManagerService. 489 */ writePremiumSmsPolicyDb()490 private void writePremiumSmsPolicyDb() { 491 synchronized (mPremiumSmsPolicy) { 492 FileOutputStream outfile = null; 493 try { 494 outfile = mPolicyFile.startWrite(); 495 496 XmlSerializer out = new FastXmlSerializer(); 497 out.setOutput(outfile, StandardCharsets.UTF_8.name()); 498 499 out.startDocument(null, true); 500 501 out.startTag(null, TAG_SMS_POLICY_BODY); 502 503 for (Map.Entry<String, Integer> policy : mPremiumSmsPolicy.entrySet()) { 504 out.startTag(null, TAG_PACKAGE); 505 out.attribute(null, ATTR_PACKAGE_NAME, policy.getKey()); 506 out.attribute(null, ATTR_PACKAGE_SMS_POLICY, policy.getValue().toString()); 507 out.endTag(null, TAG_PACKAGE); 508 } 509 510 out.endTag(null, TAG_SMS_POLICY_BODY); 511 out.endDocument(); 512 513 mPolicyFile.finishWrite(outfile); 514 } catch (IOException e) { 515 Rlog.e(TAG, "Unable to write premium SMS policy database", e); 516 if (outfile != null) { 517 mPolicyFile.failWrite(outfile); 518 } 519 } 520 } 521 } 522 523 /** 524 * Returns the premium SMS permission for the specified package. If the package has never 525 * been seen before, the default {@link #PREMIUM_SMS_PERMISSION_ASK_USER} 526 * will be returned. 527 * @param packageName the name of the package to query permission 528 * @return one of {@link #PREMIUM_SMS_PERMISSION_UNKNOWN}, 529 * {@link #PREMIUM_SMS_PERMISSION_ASK_USER}, 530 * {@link #PREMIUM_SMS_PERMISSION_NEVER_ALLOW}, or 531 * {@link #PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW} 532 * @throws SecurityException if the caller is not a system process 533 */ getPremiumSmsPermission(String packageName)534 public int getPremiumSmsPermission(String packageName) { 535 checkCallerIsSystemOrPhoneOrSameApp(packageName); 536 synchronized (mPremiumSmsPolicy) { 537 Integer policy = mPremiumSmsPolicy.get(packageName); 538 if (policy == null) { 539 return PREMIUM_SMS_PERMISSION_UNKNOWN; 540 } else { 541 return policy; 542 } 543 } 544 } 545 546 /** 547 * Sets the premium SMS permission for the specified package and save the value asynchronously 548 * to persistent storage. 549 * @param packageName the name of the package to set permission 550 * @param permission one of {@link #PREMIUM_SMS_PERMISSION_ASK_USER}, 551 * {@link #PREMIUM_SMS_PERMISSION_NEVER_ALLOW}, or 552 * {@link #PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW} 553 * @throws SecurityException if the caller is not a system process 554 */ setPremiumSmsPermission(String packageName, int permission)555 public void setPremiumSmsPermission(String packageName, int permission) { 556 checkCallerIsSystemOrPhoneApp(); 557 if (permission < PREMIUM_SMS_PERMISSION_ASK_USER 558 || permission > PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW) { 559 throw new IllegalArgumentException("invalid SMS permission type " + permission); 560 } 561 synchronized (mPremiumSmsPolicy) { 562 mPremiumSmsPolicy.put(packageName, permission); 563 } 564 // write policy file in the background 565 new Thread(new Runnable() { 566 @Override 567 public void run() { 568 writePremiumSmsPolicyDb(); 569 } 570 }).start(); 571 } 572 checkCallerIsSystemOrPhoneOrSameApp(String pkg)573 private void checkCallerIsSystemOrPhoneOrSameApp(String pkg) { 574 int uid = Binder.getCallingUid(); 575 int appId = UserHandle.getAppId(uid); 576 if (appId == Process.SYSTEM_UID || appId == Process.PHONE_UID || uid == 0) { 577 return; 578 } 579 try { 580 ApplicationInfo ai = mContext.getPackageManager().getApplicationInfoAsUser( 581 pkg, 0, UserHandle.getUserHandleForUid(uid)); 582 583 if (UserHandle.getAppId(ai.uid) != UserHandle.getAppId(uid)) { 584 throw new SecurityException("Calling uid " + uid + " gave package" 585 + pkg + " which is owned by uid " + ai.uid); 586 } 587 } catch (NameNotFoundException ex) { 588 throw new SecurityException("Unknown package " + pkg + "\n" + ex); 589 } 590 } 591 checkCallerIsSystemOrPhoneApp()592 private static void checkCallerIsSystemOrPhoneApp() { 593 int uid = Binder.getCallingUid(); 594 int appId = UserHandle.getAppId(uid); 595 if (appId == Process.SYSTEM_UID || appId == Process.PHONE_UID || uid == 0) { 596 return; 597 } 598 throw new SecurityException("Disallowed call for uid " + uid); 599 } 600 601 /** 602 * Remove keys containing only old timestamps. This can happen if an SMS app is used 603 * to send messages and then uninstalled. 604 */ removeExpiredTimestamps()605 private void removeExpiredTimestamps() { 606 long beginCheckPeriod = System.currentTimeMillis() - mCheckPeriod; 607 608 synchronized (mSmsStamp) { 609 Iterator<Map.Entry<String, ArrayList<Long>>> iter = mSmsStamp.entrySet().iterator(); 610 while (iter.hasNext()) { 611 Map.Entry<String, ArrayList<Long>> entry = iter.next(); 612 ArrayList<Long> oldList = entry.getValue(); 613 if (oldList.isEmpty() || oldList.get(oldList.size() - 1) < beginCheckPeriod) { 614 iter.remove(); 615 } 616 } 617 } 618 } 619 isUnderLimit(ArrayList<Long> sent, int smsWaiting)620 private boolean isUnderLimit(ArrayList<Long> sent, int smsWaiting) { 621 Long ct = System.currentTimeMillis(); 622 long beginCheckPeriod = ct - mCheckPeriod; 623 624 if (VDBG) log("SMS send size=" + sent.size() + " time=" + ct); 625 626 while (!sent.isEmpty() && sent.get(0) < beginCheckPeriod) { 627 sent.remove(0); 628 } 629 630 if ((sent.size() + smsWaiting) <= mMaxAllowed) { 631 for (int i = 0; i < smsWaiting; i++ ) { 632 sent.add(ct); 633 } 634 return true; 635 } 636 return false; 637 } 638 log(String msg)639 private static void log(String msg) { 640 Rlog.d(TAG, msg); 641 } 642 } 643