ServiceUtilities.cpp revision 617575b17de9b22247eb59948f134939641bd1bd
144deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten/* 244deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * Copyright (C) 2012 The Android Open Source Project 344deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * 444deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * Licensed under the Apache License, Version 2.0 (the "License"); 544deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * you may not use this file except in compliance with the License. 644deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * You may obtain a copy of the License at 744deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * 844deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * http://www.apache.org/licenses/LICENSE-2.0 944deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * 1044deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * Unless required by applicable law or agreed to in writing, software 1144deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * distributed under the License is distributed on an "AS IS" BASIS, 1244deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1344deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * See the License for the specific language governing permissions and 1444deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten * limitations under the License. 1544deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten */ 1644deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 17be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov#include <binder/AppOpsManager.h> 1844deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten#include <binder/IPCThreadState.h> 1944deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten#include <binder/IServiceManager.h> 2044deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten#include <binder/PermissionCache.h> 2144deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten#include "ServiceUtilities.h" 2244deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 23be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov/* When performing permission checks we do not use permission cache for 24be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov * runtime permissions (protection level dangerous) as they may change at 25be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov * runtime. All other permissions (protection level normal and dangerous) 26be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov * can be cached as they never change. Of course all permission checked 27be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov * here are platform defined. 28be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov */ 29be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 3044deb053252a3bd2f57a007ab9560f4924f62394Glenn Kastennamespace android { 3144deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 32949a926cadbc961fbb649c91d76d7aee8ea4d7bdGlenn Kasten// Not valid until initialized by AudioFlinger constructor. It would have to be 33949a926cadbc961fbb649c91d76d7aee8ea4d7bdGlenn Kasten// re-initialized if the process containing AudioFlinger service forks (which it doesn't). 34949a926cadbc961fbb649c91d76d7aee8ea4d7bdGlenn Kastenpid_t getpid_cached; 3544deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 36be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganovbool recordingAllowed(const String16& opPackageName) { 37be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // Note: We are getting the UID from the calling IPC thread state because all 38be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // clients that perform recording create AudioRecord in their own processes 39be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // and the system does not create AudioRecord objects on behalf of apps. This 40be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // differs from playback where in some situations the system recreates AudioTrack 41be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // instances associated with a client's MediaPlayer on behalf of this client. 42be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // In the latter case we have to store the client UID and pass in along for 43be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // security checks. 44be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 4544deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true; 4644deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten static const String16 sRecordAudio("android.permission.RECORD_AUDIO"); 47be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 48be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Don't use PermissionCache - a runtime permission and may change. 49be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov const bool ok = checkCallingPermission(sRecordAudio); 50be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov if (!ok) { 51be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov ALOGE("Request requires android.permission.RECORD_AUDIO"); 52be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov return false; 53be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov } 54be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 55be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov const uid_t uid = IPCThreadState::self()->getCallingUid(); 56be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov String16 checkedOpPackageName = opPackageName; 57be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 58be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // In some cases the calling code has no access to the package it runs under. 59be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // For example, code using the wilhelm framework's OpenSL-ES APIs. In this 60be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // case we will get the packages for the calling UID and pick the first one 61be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // for attributing the app op. This will work correctly for runtime permissions 62be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // as for legacy apps we will toggle the app op for all packages in the UID. 63be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // The caveat is that the operation may be attributed to the wrong package and 64be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // stats based on app ops may be slightly off. 65be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov if (checkedOpPackageName.size() <= 0) { 66be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov sp<IServiceManager> sm = defaultServiceManager(); 67be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov sp<IBinder> binder = sm->getService(String16("permission")); 68be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov if (binder == 0) { 69be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov ALOGE("Cannot get permission service"); 70be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov return false; 71be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov } 72be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 73be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov sp<IPermissionController> permCtrl = interface_cast<IPermissionController>(binder); 74be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov Vector<String16> packages; 75be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 76be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov permCtrl->getPackagesForUid(uid, packages); 77be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 78be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov if (packages.isEmpty()) { 79be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov ALOGE("No packages for calling UID"); 80be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov return false; 81be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov } 82be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov checkedOpPackageName = packages[0]; 83be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov } 84be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 85be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov AppOpsManager appOps; 86617575b17de9b22247eb59948f134939641bd1bdEric Laurent if (appOps.noteOp(AppOpsManager::OP_RECORD_AUDIO, uid, checkedOpPackageName) 87be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov != AppOpsManager::MODE_ALLOWED) { 88be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov ALOGE("Request denied by app op OP_RECORD_AUDIO"); 89be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov return false; 90be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov } 91be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov 92be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov return true; 9344deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten} 9444deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 95893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brownbool captureAudioOutputAllowed() { 96893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true; 97893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown static const String16 sCaptureAudioOutput("android.permission.CAPTURE_AUDIO_OUTPUT"); 98be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Use PermissionCache - not a runtime permission and may not change. 99be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov bool ok = PermissionCache::checkCallingPermission(sCaptureAudioOutput); 100893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown if (!ok) ALOGE("Request requires android.permission.CAPTURE_AUDIO_OUTPUT"); 101893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown return ok; 102893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown} 103893a5642871114fca3b2a00c6ff8e5699ce3e3edJeff Brown 1049a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurentbool captureHotwordAllowed() { 1059a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurent static const String16 sCaptureHotwordAllowed("android.permission.CAPTURE_AUDIO_HOTWORD"); 106be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Use PermissionCache - not a runtime permission and may not change. 107be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov bool ok = PermissionCache::checkCallingPermission(sCaptureHotwordAllowed); 1089a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurent if (!ok) ALOGE("android.permission.CAPTURE_AUDIO_HOTWORD"); 1099a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurent return ok; 1109a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurent} 1119a54bc27876acd5d8be5b1fc3dc46701fe76fbb3Eric Laurent 11244deb053252a3bd2f57a007ab9560f4924f62394Glenn Kastenbool settingsAllowed() { 11344deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true; 11444deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten static const String16 sAudioSettings("android.permission.MODIFY_AUDIO_SETTINGS"); 115be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Use PermissionCache - not a runtime permission and may not change. 116be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov bool ok = PermissionCache::checkCallingPermission(sAudioSettings); 11744deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten if (!ok) ALOGE("Request requires android.permission.MODIFY_AUDIO_SETTINGS"); 11844deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten return ok; 11944deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten} 12044deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 1215284ed53c14cd4d15bd793000ede7166d143e69aEric Laurentbool modifyAudioRoutingAllowed() { 1225284ed53c14cd4d15bd793000ede7166d143e69aEric Laurent static const String16 sModifyAudioRoutingAllowed("android.permission.MODIFY_AUDIO_ROUTING"); 123be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Use PermissionCache - not a runtime permission and may not change. 124be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov bool ok = PermissionCache::checkCallingPermission(sModifyAudioRoutingAllowed); 1255284ed53c14cd4d15bd793000ede7166d143e69aEric Laurent if (!ok) ALOGE("android.permission.MODIFY_AUDIO_ROUTING"); 1265284ed53c14cd4d15bd793000ede7166d143e69aEric Laurent return ok; 1275284ed53c14cd4d15bd793000ede7166d143e69aEric Laurent} 1285284ed53c14cd4d15bd793000ede7166d143e69aEric Laurent 12944deb053252a3bd2f57a007ab9560f4924f62394Glenn Kastenbool dumpAllowed() { 13044deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten // don't optimize for same pid, since mediaserver never dumps itself 13144deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten static const String16 sDump("android.permission.DUMP"); 132be71aa29a3c86d2e01cd17839d2a72ab09a1bce5Svet Ganov // IMPORTANT: Use PermissionCache - not a runtime permission and may not change. 13344deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten bool ok = PermissionCache::checkCallingPermission(sDump); 13444deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten // convention is for caller to dump an error message to fd instead of logging here 13544deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten //if (!ok) ALOGE("Request requires android.permission.DUMP"); 13644deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten return ok; 13744deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten} 13844deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten 13944deb053252a3bd2f57a007ab9560f4924f62394Glenn Kasten} // namespace android 140