Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2020 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 | package com.android.server.blob; |
| 17 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 18 | import static android.app.blob.BlobStoreManager.COMMIT_RESULT_ERROR; |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 19 | import static android.app.blob.XmlTags.ATTR_CREATION_TIME_MS; |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 20 | import static android.app.blob.XmlTags.ATTR_ID; |
| 21 | import static android.app.blob.XmlTags.ATTR_PACKAGE; |
| 22 | import static android.app.blob.XmlTags.ATTR_UID; |
| 23 | import static android.app.blob.XmlTags.TAG_ACCESS_MODE; |
| 24 | import static android.app.blob.XmlTags.TAG_BLOB_HANDLE; |
Sudheer Shanka | d4ea5e1 | 2020-02-04 16:42:17 -0800 | [diff] [blame] | 25 | import static android.os.Trace.TRACE_TAG_SYSTEM_SERVER; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 26 | import static android.system.OsConstants.O_CREAT; |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 27 | import static android.system.OsConstants.O_RDONLY; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 28 | import static android.system.OsConstants.O_RDWR; |
| 29 | import static android.system.OsConstants.SEEK_SET; |
Sudheer Shanka | 7535154 | 2020-06-05 22:42:56 -0700 | [diff] [blame] | 30 | import static android.text.format.Formatter.FLAG_IEC_UNITS; |
| 31 | import static android.text.format.Formatter.formatFileSize; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 32 | |
| 33 | import static com.android.server.blob.BlobStoreConfig.TAG; |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 34 | import static com.android.server.blob.BlobStoreConfig.XML_VERSION_ADD_SESSION_CREATION_TIME; |
Sudheer Shanka | 07717c9 | 2020-06-23 14:06:47 -0700 | [diff] [blame] | 35 | import static com.android.server.blob.BlobStoreConfig.getMaxPermittedPackages; |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 36 | import static com.android.server.blob.BlobStoreConfig.hasSessionExpired; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 37 | |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 38 | import android.annotation.BytesLong; |
| 39 | import android.annotation.NonNull; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 40 | import android.annotation.Nullable; |
| 41 | import android.app.blob.BlobHandle; |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 42 | import android.app.blob.IBlobCommitCallback; |
| 43 | import android.app.blob.IBlobStoreSession; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 44 | import android.content.Context; |
| 45 | import android.os.Binder; |
| 46 | import android.os.FileUtils; |
Sudheer Shanka | 07717c9 | 2020-06-23 14:06:47 -0700 | [diff] [blame] | 47 | import android.os.LimitExceededException; |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 48 | import android.os.ParcelFileDescriptor; |
Sudheer Shanka | 07717c9 | 2020-06-23 14:06:47 -0700 | [diff] [blame] | 49 | import android.os.ParcelableException; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 50 | import android.os.RemoteException; |
| 51 | import android.os.RevocableFileDescriptor; |
Sudheer Shanka | d4ea5e1 | 2020-02-04 16:42:17 -0800 | [diff] [blame] | 52 | import android.os.Trace; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 53 | import android.os.storage.StorageManager; |
| 54 | import android.system.ErrnoException; |
| 55 | import android.system.Os; |
| 56 | import android.util.ExceptionUtils; |
| 57 | import android.util.Slog; |
| 58 | |
| 59 | import com.android.internal.annotations.GuardedBy; |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 60 | import com.android.internal.annotations.VisibleForTesting; |
Michael Wachenschwanz | 1a7f7ab | 2020-06-09 20:16:27 -0700 | [diff] [blame] | 61 | import com.android.internal.util.FrameworkStatsLog; |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 62 | import com.android.internal.util.IndentingPrintWriter; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 63 | import com.android.internal.util.Preconditions; |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 64 | import com.android.internal.util.XmlUtils; |
Sudheer Shanka | 5caeed5 | 2020-02-01 12:54:33 -0800 | [diff] [blame] | 65 | import com.android.server.blob.BlobStoreManagerService.DumpArgs; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 66 | import com.android.server.blob.BlobStoreManagerService.SessionStateChangeListener; |
| 67 | |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 68 | import libcore.io.IoUtils; |
| 69 | |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 70 | import org.xmlpull.v1.XmlPullParser; |
| 71 | import org.xmlpull.v1.XmlPullParserException; |
| 72 | import org.xmlpull.v1.XmlSerializer; |
| 73 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 74 | import java.io.File; |
| 75 | import java.io.FileDescriptor; |
| 76 | import java.io.IOException; |
| 77 | import java.security.NoSuchAlgorithmException; |
| 78 | import java.util.ArrayList; |
| 79 | import java.util.Arrays; |
Sudheer Shanka | 4824e3d | 2020-01-29 23:50:24 -0800 | [diff] [blame] | 80 | import java.util.Objects; |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 81 | |
Sudheer Shanka | 07717c9 | 2020-06-23 14:06:47 -0700 | [diff] [blame] | 82 | /** |
| 83 | * Class to represent the state corresponding to an ongoing |
| 84 | * {@link android.app.blob.BlobStoreManager.Session} |
| 85 | */ |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 86 | @VisibleForTesting |
| 87 | class BlobStoreSession extends IBlobStoreSession.Stub { |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 88 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 89 | static final int STATE_OPENED = 1; |
| 90 | static final int STATE_CLOSED = 0; |
| 91 | static final int STATE_ABANDONED = 2; |
| 92 | static final int STATE_COMMITTED = 3; |
| 93 | static final int STATE_VERIFIED_VALID = 4; |
| 94 | static final int STATE_VERIFIED_INVALID = 5; |
| 95 | |
| 96 | private final Object mSessionLock = new Object(); |
| 97 | |
| 98 | private final Context mContext; |
| 99 | private final SessionStateChangeListener mListener; |
| 100 | |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 101 | private final BlobHandle mBlobHandle; |
| 102 | private final long mSessionId; |
| 103 | private final int mOwnerUid; |
| 104 | private final String mOwnerPackageName; |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 105 | private final long mCreationTimeMs; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 106 | |
| 107 | // Do not access this directly, instead use getSessionFile(). |
| 108 | private File mSessionFile; |
| 109 | |
| 110 | @GuardedBy("mRevocableFds") |
Sudheer Shanka | 36b25a1 | 2020-06-13 22:27:28 -0700 | [diff] [blame] | 111 | private final ArrayList<RevocableFileDescriptor> mRevocableFds = new ArrayList<>(); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 112 | |
Sudheer Shanka | b76f766 | 2020-02-27 15:17:43 -0800 | [diff] [blame] | 113 | // This will be accessed from only one thread at any point of time, so no need to grab |
| 114 | // a lock for this. |
| 115 | private byte[] mDataDigest; |
| 116 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 117 | @GuardedBy("mSessionLock") |
| 118 | private int mState = STATE_CLOSED; |
| 119 | |
| 120 | @GuardedBy("mSessionLock") |
| 121 | private final BlobAccessMode mBlobAccessMode = new BlobAccessMode(); |
| 122 | |
| 123 | @GuardedBy("mSessionLock") |
| 124 | private IBlobCommitCallback mBlobCommitCallback; |
| 125 | |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 126 | private BlobStoreSession(Context context, long sessionId, BlobHandle blobHandle, |
| 127 | int ownerUid, String ownerPackageName, long creationTimeMs, |
| 128 | SessionStateChangeListener listener) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 129 | this.mContext = context; |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 130 | this.mBlobHandle = blobHandle; |
| 131 | this.mSessionId = sessionId; |
| 132 | this.mOwnerUid = ownerUid; |
| 133 | this.mOwnerPackageName = ownerPackageName; |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 134 | this.mCreationTimeMs = creationTimeMs; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 135 | this.mListener = listener; |
| 136 | } |
| 137 | |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 138 | BlobStoreSession(Context context, long sessionId, BlobHandle blobHandle, |
| 139 | int ownerUid, String ownerPackageName, SessionStateChangeListener listener) { |
| 140 | this(context, sessionId, blobHandle, ownerUid, ownerPackageName, |
| 141 | System.currentTimeMillis(), listener); |
| 142 | } |
| 143 | |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 144 | public BlobHandle getBlobHandle() { |
| 145 | return mBlobHandle; |
| 146 | } |
| 147 | |
| 148 | public long getSessionId() { |
| 149 | return mSessionId; |
| 150 | } |
| 151 | |
| 152 | public int getOwnerUid() { |
| 153 | return mOwnerUid; |
| 154 | } |
| 155 | |
| 156 | public String getOwnerPackageName() { |
| 157 | return mOwnerPackageName; |
| 158 | } |
| 159 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 160 | boolean hasAccess(int callingUid, String callingPackageName) { |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 161 | return mOwnerUid == callingUid && mOwnerPackageName.equals(callingPackageName); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | void open() { |
| 165 | synchronized (mSessionLock) { |
| 166 | if (isFinalized()) { |
| 167 | throw new IllegalStateException("Not allowed to open session with state: " |
| 168 | + stateToString(mState)); |
| 169 | } |
| 170 | mState = STATE_OPENED; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | int getState() { |
| 175 | synchronized (mSessionLock) { |
| 176 | return mState; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | void sendCommitCallbackResult(int result) { |
| 181 | synchronized (mSessionLock) { |
| 182 | try { |
| 183 | mBlobCommitCallback.onResult(result); |
| 184 | } catch (RemoteException e) { |
| 185 | Slog.d(TAG, "Error sending the callback result", e); |
| 186 | } |
| 187 | mBlobCommitCallback = null; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | BlobAccessMode getBlobAccessMode() { |
| 192 | synchronized (mSessionLock) { |
| 193 | return mBlobAccessMode; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | boolean isFinalized() { |
| 198 | synchronized (mSessionLock) { |
| 199 | return mState == STATE_COMMITTED || mState == STATE_ABANDONED; |
| 200 | } |
| 201 | } |
| 202 | |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 203 | boolean isExpired() { |
| 204 | final long lastModifiedTimeMs = getSessionFile().lastModified(); |
| 205 | return hasSessionExpired(lastModifiedTimeMs == 0 |
| 206 | ? mCreationTimeMs : lastModifiedTimeMs); |
| 207 | } |
| 208 | |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 209 | @Override |
| 210 | @NonNull |
| 211 | public ParcelFileDescriptor openWrite(@BytesLong long offsetBytes, |
| 212 | @BytesLong long lengthBytes) { |
Sudheer Shanka | 4824e3d | 2020-01-29 23:50:24 -0800 | [diff] [blame] | 213 | Preconditions.checkArgumentNonnegative(offsetBytes, "offsetBytes must not be negative"); |
| 214 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 215 | assertCallerIsOwner(); |
| 216 | synchronized (mSessionLock) { |
| 217 | if (mState != STATE_OPENED) { |
| 218 | throw new IllegalStateException("Not allowed to write in state: " |
| 219 | + stateToString(mState)); |
| 220 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 221 | } |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 222 | |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 223 | FileDescriptor fd = null; |
| 224 | try { |
| 225 | fd = openWriteInternal(offsetBytes, lengthBytes); |
| 226 | final RevocableFileDescriptor revocableFd = new RevocableFileDescriptor(mContext, fd); |
| 227 | synchronized (mSessionLock) { |
| 228 | if (mState != STATE_OPENED) { |
| 229 | IoUtils.closeQuietly(fd); |
| 230 | throw new IllegalStateException("Not allowed to write in state: " |
| 231 | + stateToString(mState)); |
| 232 | } |
| 233 | trackRevocableFdLocked(revocableFd); |
| 234 | return revocableFd.getRevocableFileDescriptor(); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 235 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 236 | } catch (IOException e) { |
| 237 | IoUtils.closeQuietly(fd); |
| 238 | throw ExceptionUtils.wrap(e); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 239 | } |
| 240 | } |
| 241 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 242 | @NonNull |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 243 | private FileDescriptor openWriteInternal(@BytesLong long offsetBytes, |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 244 | @BytesLong long lengthBytes) throws IOException { |
| 245 | // TODO: Add limit on active open sessions/writes/reads |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 246 | try { |
| 247 | final File sessionFile = getSessionFile(); |
| 248 | if (sessionFile == null) { |
| 249 | throw new IllegalStateException("Couldn't get the file for this session"); |
| 250 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 251 | final FileDescriptor fd = Os.open(sessionFile.getPath(), O_CREAT | O_RDWR, 0600); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 252 | if (offsetBytes > 0) { |
| 253 | final long curOffset = Os.lseek(fd, offsetBytes, SEEK_SET); |
| 254 | if (curOffset != offsetBytes) { |
| 255 | throw new IllegalStateException("Failed to seek " + offsetBytes |
| 256 | + "; curOffset=" + offsetBytes); |
| 257 | } |
| 258 | } |
| 259 | if (lengthBytes > 0) { |
| 260 | mContext.getSystemService(StorageManager.class).allocateBytes(fd, lengthBytes); |
| 261 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 262 | return fd; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 263 | } catch (ErrnoException e) { |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 264 | throw e.rethrowAsIOException(); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 265 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | @Override |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 269 | @NonNull |
| 270 | public ParcelFileDescriptor openRead() { |
| 271 | assertCallerIsOwner(); |
| 272 | synchronized (mSessionLock) { |
| 273 | if (mState != STATE_OPENED) { |
| 274 | throw new IllegalStateException("Not allowed to read in state: " |
| 275 | + stateToString(mState)); |
| 276 | } |
Sudheer Shanka | d6f4794 | 2020-06-18 16:46:36 -0700 | [diff] [blame] | 277 | if (!BlobStoreConfig.shouldUseRevocableFdForReads()) { |
| 278 | try { |
| 279 | return new ParcelFileDescriptor(openReadInternal()); |
| 280 | } catch (IOException e) { |
| 281 | throw ExceptionUtils.wrap(e); |
| 282 | } |
| 283 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 284 | } |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 285 | |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 286 | FileDescriptor fd = null; |
| 287 | try { |
| 288 | fd = openReadInternal(); |
| 289 | final RevocableFileDescriptor revocableFd = new RevocableFileDescriptor(mContext, fd); |
| 290 | synchronized (mSessionLock) { |
| 291 | if (mState != STATE_OPENED) { |
| 292 | IoUtils.closeQuietly(fd); |
| 293 | throw new IllegalStateException("Not allowed to read in state: " |
| 294 | + stateToString(mState)); |
| 295 | } |
| 296 | trackRevocableFdLocked(revocableFd); |
| 297 | return revocableFd.getRevocableFileDescriptor(); |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 298 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 299 | } catch (IOException e) { |
| 300 | IoUtils.closeQuietly(fd); |
| 301 | throw ExceptionUtils.wrap(e); |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 302 | } |
| 303 | } |
| 304 | |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 305 | @NonNull |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 306 | private FileDescriptor openReadInternal() throws IOException { |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 307 | try { |
| 308 | final File sessionFile = getSessionFile(); |
| 309 | if (sessionFile == null) { |
| 310 | throw new IllegalStateException("Couldn't get the file for this session"); |
| 311 | } |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 312 | final FileDescriptor fd = Os.open(sessionFile.getPath(), O_RDONLY, 0); |
| 313 | return fd; |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 314 | } catch (ErrnoException e) { |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 315 | throw e.rethrowAsIOException(); |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 316 | } |
Sudheer Shanka | db483fa | 2020-01-22 12:31:33 -0800 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | @Override |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 320 | @BytesLong |
| 321 | public long getSize() { |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 322 | return getSessionFile().length(); |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | @Override |
| 326 | public void allowPackageAccess(@NonNull String packageName, |
| 327 | @NonNull byte[] certificate) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 328 | assertCallerIsOwner(); |
Sudheer Shanka | 4824e3d | 2020-01-29 23:50:24 -0800 | [diff] [blame] | 329 | Objects.requireNonNull(packageName, "packageName must not be null"); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 330 | synchronized (mSessionLock) { |
| 331 | if (mState != STATE_OPENED) { |
| 332 | throw new IllegalStateException("Not allowed to change access type in state: " |
| 333 | + stateToString(mState)); |
| 334 | } |
Sudheer Shanka | 07717c9 | 2020-06-23 14:06:47 -0700 | [diff] [blame] | 335 | if (mBlobAccessMode.getNumWhitelistedPackages() >= getMaxPermittedPackages()) { |
| 336 | throw new ParcelableException(new LimitExceededException( |
| 337 | "Too many packages permitted to access the blob: " |
| 338 | + mBlobAccessMode.getNumWhitelistedPackages())); |
| 339 | } |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 340 | mBlobAccessMode.allowPackageAccess(packageName, certificate); |
| 341 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | @Override |
| 345 | public void allowSameSignatureAccess() { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 346 | assertCallerIsOwner(); |
| 347 | synchronized (mSessionLock) { |
| 348 | if (mState != STATE_OPENED) { |
| 349 | throw new IllegalStateException("Not allowed to change access type in state: " |
| 350 | + stateToString(mState)); |
| 351 | } |
| 352 | mBlobAccessMode.allowSameSignatureAccess(); |
| 353 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | @Override |
| 357 | public void allowPublicAccess() { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 358 | assertCallerIsOwner(); |
| 359 | synchronized (mSessionLock) { |
| 360 | if (mState != STATE_OPENED) { |
| 361 | throw new IllegalStateException("Not allowed to change access type in state: " |
| 362 | + stateToString(mState)); |
| 363 | } |
| 364 | mBlobAccessMode.allowPublicAccess(); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | @Override |
| 369 | public boolean isPackageAccessAllowed(@NonNull String packageName, |
| 370 | @NonNull byte[] certificate) { |
| 371 | assertCallerIsOwner(); |
Sudheer Shanka | 4824e3d | 2020-01-29 23:50:24 -0800 | [diff] [blame] | 372 | Objects.requireNonNull(packageName, "packageName must not be null"); |
| 373 | Preconditions.checkByteArrayNotEmpty(certificate, "certificate"); |
| 374 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 375 | synchronized (mSessionLock) { |
| 376 | if (mState != STATE_OPENED) { |
| 377 | throw new IllegalStateException("Not allowed to get access type in state: " |
| 378 | + stateToString(mState)); |
| 379 | } |
| 380 | return mBlobAccessMode.isPackageAccessAllowed(packageName, certificate); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | @Override |
| 385 | public boolean isSameSignatureAccessAllowed() { |
| 386 | assertCallerIsOwner(); |
| 387 | synchronized (mSessionLock) { |
| 388 | if (mState != STATE_OPENED) { |
| 389 | throw new IllegalStateException("Not allowed to get access type in state: " |
| 390 | + stateToString(mState)); |
| 391 | } |
| 392 | return mBlobAccessMode.isSameSignatureAccessAllowed(); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | @Override |
| 397 | public boolean isPublicAccessAllowed() { |
| 398 | assertCallerIsOwner(); |
| 399 | synchronized (mSessionLock) { |
| 400 | if (mState != STATE_OPENED) { |
| 401 | throw new IllegalStateException("Not allowed to get access type in state: " |
| 402 | + stateToString(mState)); |
| 403 | } |
| 404 | return mBlobAccessMode.isPublicAccessAllowed(); |
| 405 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | @Override |
| 409 | public void close() { |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 410 | closeSession(STATE_CLOSED, false /* sendCallback */); |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | @Override |
| 414 | public void abandon() { |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 415 | closeSession(STATE_ABANDONED, true /* sendCallback */); |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | @Override |
| 419 | public void commit(IBlobCommitCallback callback) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 420 | synchronized (mSessionLock) { |
| 421 | mBlobCommitCallback = callback; |
| 422 | |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 423 | closeSession(STATE_COMMITTED, true /* sendCallback */); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 424 | } |
| 425 | } |
| 426 | |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 427 | private void closeSession(int state, boolean sendCallback) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 428 | assertCallerIsOwner(); |
| 429 | synchronized (mSessionLock) { |
| 430 | if (mState != STATE_OPENED) { |
| 431 | if (state == STATE_CLOSED) { |
| 432 | // Just trying to close the session which is already deleted or abandoned, |
| 433 | // ignore. |
| 434 | return; |
| 435 | } else { |
| 436 | throw new IllegalStateException("Not allowed to delete or abandon a session" |
| 437 | + " with state: " + stateToString(mState)); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | mState = state; |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 442 | revokeAllFds(); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 443 | |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 444 | if (sendCallback) { |
| 445 | mListener.onStateChanged(this); |
| 446 | } |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 447 | } |
| 448 | } |
| 449 | |
Sudheer Shanka | b76f766 | 2020-02-27 15:17:43 -0800 | [diff] [blame] | 450 | void computeDigest() { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 451 | try { |
Sudheer Shanka | d4ea5e1 | 2020-02-04 16:42:17 -0800 | [diff] [blame] | 452 | Trace.traceBegin(TRACE_TAG_SYSTEM_SERVER, |
| 453 | "computeBlobDigest-i" + mSessionId + "-l" + getSessionFile().length()); |
Sudheer Shanka | b76f766 | 2020-02-27 15:17:43 -0800 | [diff] [blame] | 454 | mDataDigest = FileUtils.digest(getSessionFile(), mBlobHandle.algorithm); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 455 | } catch (IOException | NoSuchAlgorithmException e) { |
| 456 | Slog.e(TAG, "Error computing the digest", e); |
Sudheer Shanka | d4ea5e1 | 2020-02-04 16:42:17 -0800 | [diff] [blame] | 457 | } finally { |
| 458 | Trace.traceEnd(TRACE_TAG_SYSTEM_SERVER); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 459 | } |
Sudheer Shanka | b76f766 | 2020-02-27 15:17:43 -0800 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | void verifyBlobData() { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 463 | synchronized (mSessionLock) { |
Sudheer Shanka | b76f766 | 2020-02-27 15:17:43 -0800 | [diff] [blame] | 464 | if (mDataDigest != null && Arrays.equals(mDataDigest, mBlobHandle.digest)) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 465 | mState = STATE_VERIFIED_VALID; |
| 466 | // Commit callback will be sent once the data is persisted. |
| 467 | } else { |
Sudheer Shanka | 1680642 | 2020-06-05 15:36:37 -0700 | [diff] [blame] | 468 | Slog.d(TAG, "Digest of the data (" |
| 469 | + (mDataDigest == null ? "null" : BlobHandle.safeDigest(mDataDigest)) |
| 470 | + ") didn't match the given BlobHandle.digest (" |
| 471 | + BlobHandle.safeDigest(mBlobHandle.digest) + ")"); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 472 | mState = STATE_VERIFIED_INVALID; |
Michael Wachenschwanz | 1a7f7ab | 2020-06-09 20:16:27 -0700 | [diff] [blame] | 473 | |
| 474 | FrameworkStatsLog.write(FrameworkStatsLog.BLOB_COMMITTED, getOwnerUid(), mSessionId, |
| 475 | getSize(), FrameworkStatsLog.BLOB_COMMITTED__RESULT__DIGEST_MISMATCH); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 476 | sendCommitCallbackResult(COMMIT_RESULT_ERROR); |
| 477 | } |
| 478 | mListener.onStateChanged(this); |
| 479 | } |
| 480 | } |
| 481 | |
Sudheer Shanka | 9ed7249 | 2020-06-24 13:33:18 -0700 | [diff] [blame] | 482 | void destroy() { |
| 483 | revokeAllFds(); |
| 484 | getSessionFile().delete(); |
| 485 | } |
| 486 | |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 487 | private void revokeAllFds() { |
| 488 | synchronized (mRevocableFds) { |
| 489 | for (int i = mRevocableFds.size() - 1; i >= 0; --i) { |
| 490 | mRevocableFds.get(i).revoke(); |
| 491 | } |
| 492 | mRevocableFds.clear(); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 493 | } |
| 494 | } |
| 495 | |
| 496 | @GuardedBy("mSessionLock") |
Sudheer Shanka | 300d9cb | 2020-06-04 23:33:13 -0700 | [diff] [blame] | 497 | private void trackRevocableFdLocked(RevocableFileDescriptor revocableFd) { |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 498 | synchronized (mRevocableFds) { |
| 499 | mRevocableFds.add(revocableFd); |
| 500 | } |
| 501 | revocableFd.addOnCloseListener((e) -> { |
| 502 | synchronized (mRevocableFds) { |
| 503 | mRevocableFds.remove(revocableFd); |
| 504 | } |
| 505 | }); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | @Nullable |
| 509 | File getSessionFile() { |
| 510 | if (mSessionFile == null) { |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 511 | mSessionFile = BlobStoreConfig.prepareBlobFile(mSessionId); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 512 | } |
| 513 | return mSessionFile; |
| 514 | } |
| 515 | |
| 516 | @NonNull |
| 517 | static String stateToString(int state) { |
| 518 | switch (state) { |
| 519 | case STATE_OPENED: |
| 520 | return "<opened>"; |
| 521 | case STATE_CLOSED: |
| 522 | return "<closed>"; |
| 523 | case STATE_ABANDONED: |
| 524 | return "<abandoned>"; |
| 525 | case STATE_COMMITTED: |
| 526 | return "<committed>"; |
Sudheer Shanka | b5239e4 | 2020-03-04 23:23:54 -0800 | [diff] [blame] | 527 | case STATE_VERIFIED_VALID: |
| 528 | return "<verified_valid>"; |
| 529 | case STATE_VERIFIED_INVALID: |
| 530 | return "<verified_invalid>"; |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 531 | default: |
| 532 | Slog.wtf(TAG, "Unknown state: " + state); |
| 533 | return "<unknown>"; |
| 534 | } |
| 535 | } |
| 536 | |
Sudheer Shanka | e53e1ed | 2020-02-03 17:15:24 -0800 | [diff] [blame] | 537 | @Override |
| 538 | public String toString() { |
| 539 | return "BlobStoreSession {" |
| 540 | + "id:" + mSessionId |
| 541 | + ",handle:" + mBlobHandle |
| 542 | + ",uid:" + mOwnerUid |
| 543 | + ",pkg:" + mOwnerPackageName |
| 544 | + "}"; |
| 545 | } |
| 546 | |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 547 | private void assertCallerIsOwner() { |
| 548 | final int callingUid = Binder.getCallingUid(); |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 549 | if (callingUid != mOwnerUid) { |
| 550 | throw new SecurityException(mOwnerUid + " is not the session owner"); |
Sudheer Shanka | ab1d416 | 2020-01-07 10:37:50 -0800 | [diff] [blame] | 551 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 552 | } |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 553 | |
Sudheer Shanka | 5caeed5 | 2020-02-01 12:54:33 -0800 | [diff] [blame] | 554 | void dump(IndentingPrintWriter fout, DumpArgs dumpArgs) { |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 555 | synchronized (mSessionLock) { |
| 556 | fout.println("state: " + stateToString(mState)); |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 557 | fout.println("ownerUid: " + mOwnerUid); |
| 558 | fout.println("ownerPkg: " + mOwnerPackageName); |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 559 | fout.println("creation time: " + BlobStoreUtils.formatTime(mCreationTimeMs)); |
Sudheer Shanka | 7535154 | 2020-06-05 22:42:56 -0700 | [diff] [blame] | 560 | fout.println("size: " + formatFileSize(mContext, getSize(), FLAG_IEC_UNITS)); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 561 | |
| 562 | fout.println("blobHandle:"); |
| 563 | fout.increaseIndent(); |
Sudheer Shanka | 5caeed5 | 2020-02-01 12:54:33 -0800 | [diff] [blame] | 564 | mBlobHandle.dump(fout, dumpArgs.shouldDumpFull()); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 565 | fout.decreaseIndent(); |
| 566 | |
| 567 | fout.println("accessMode:"); |
| 568 | fout.increaseIndent(); |
| 569 | mBlobAccessMode.dump(fout); |
| 570 | fout.decreaseIndent(); |
| 571 | |
| 572 | fout.println("Open fds: #" + mRevocableFds.size()); |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | void writeToXml(@NonNull XmlSerializer out) throws IOException { |
| 577 | synchronized (mSessionLock) { |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 578 | XmlUtils.writeLongAttribute(out, ATTR_ID, mSessionId); |
| 579 | XmlUtils.writeStringAttribute(out, ATTR_PACKAGE, mOwnerPackageName); |
| 580 | XmlUtils.writeIntAttribute(out, ATTR_UID, mOwnerUid); |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 581 | XmlUtils.writeLongAttribute(out, ATTR_CREATION_TIME_MS, mCreationTimeMs); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 582 | |
| 583 | out.startTag(null, TAG_BLOB_HANDLE); |
Sudheer Shanka | bda89c1 | 2020-01-30 15:19:24 -0800 | [diff] [blame] | 584 | mBlobHandle.writeToXml(out); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 585 | out.endTag(null, TAG_BLOB_HANDLE); |
| 586 | |
| 587 | out.startTag(null, TAG_ACCESS_MODE); |
| 588 | mBlobAccessMode.writeToXml(out); |
| 589 | out.endTag(null, TAG_ACCESS_MODE); |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | @Nullable |
Sudheer Shanka | 1406bc8 | 2020-02-03 12:27:24 -0800 | [diff] [blame] | 594 | static BlobStoreSession createFromXml(@NonNull XmlPullParser in, int version, |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 595 | @NonNull Context context, @NonNull SessionStateChangeListener stateChangeListener) |
| 596 | throws IOException, XmlPullParserException { |
Sudheer Shanka | 34c24fb | 2020-02-18 14:50:40 -0800 | [diff] [blame] | 597 | final long sessionId = XmlUtils.readLongAttribute(in, ATTR_ID); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 598 | final String ownerPackageName = XmlUtils.readStringAttribute(in, ATTR_PACKAGE); |
| 599 | final int ownerUid = XmlUtils.readIntAttribute(in, ATTR_UID); |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 600 | final long creationTimeMs = version >= XML_VERSION_ADD_SESSION_CREATION_TIME |
| 601 | ? XmlUtils.readLongAttribute(in, ATTR_CREATION_TIME_MS) |
| 602 | : System.currentTimeMillis(); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 603 | |
| 604 | final int depth = in.getDepth(); |
| 605 | BlobHandle blobHandle = null; |
| 606 | BlobAccessMode blobAccessMode = null; |
| 607 | while (XmlUtils.nextElementWithin(in, depth)) { |
| 608 | if (TAG_BLOB_HANDLE.equals(in.getName())) { |
| 609 | blobHandle = BlobHandle.createFromXml(in); |
| 610 | } else if (TAG_ACCESS_MODE.equals(in.getName())) { |
| 611 | blobAccessMode = BlobAccessMode.createFromXml(in); |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | if (blobHandle == null) { |
| 616 | Slog.wtf(TAG, "blobHandle should be available"); |
| 617 | return null; |
| 618 | } |
| 619 | if (blobAccessMode == null) { |
| 620 | Slog.wtf(TAG, "blobAccessMode should be available"); |
| 621 | return null; |
| 622 | } |
| 623 | |
| 624 | final BlobStoreSession blobStoreSession = new BlobStoreSession(context, sessionId, |
Sudheer Shanka | b2a17b7 | 2020-05-28 01:14:10 -0700 | [diff] [blame] | 625 | blobHandle, ownerUid, ownerPackageName, creationTimeMs, stateChangeListener); |
Sudheer Shanka | f6e23b9 | 2020-01-15 01:51:15 -0800 | [diff] [blame] | 626 | blobStoreSession.mBlobAccessMode.allow(blobAccessMode); |
| 627 | return blobStoreSession; |
| 628 | } |
Sudheer Shanka | d2da067 | 2019-12-20 15:51:20 -0800 | [diff] [blame] | 629 | } |