Alex Johnston | 011f5c6 | 2019-12-18 17:05:57 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2019 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 android.app.admin; |
| 18 | |
| 19 | import static org.xmlpull.v1.XmlPullParser.END_DOCUMENT; |
| 20 | import static org.xmlpull.v1.XmlPullParser.END_TAG; |
| 21 | import static org.xmlpull.v1.XmlPullParser.TEXT; |
| 22 | |
| 23 | import android.annotation.NonNull; |
| 24 | import android.annotation.Nullable; |
| 25 | import android.content.ComponentName; |
| 26 | import android.os.Parcel; |
| 27 | import android.os.Parcelable; |
| 28 | import android.util.Log; |
| 29 | |
| 30 | import org.xmlpull.v1.XmlPullParser; |
| 31 | import org.xmlpull.v1.XmlPullParserException; |
| 32 | import org.xmlpull.v1.XmlSerializer; |
| 33 | |
| 34 | import java.io.IOException; |
| 35 | import java.util.ArrayList; |
| 36 | import java.util.List; |
| 37 | |
| 38 | /** |
| 39 | * The factory reset protection policy determines which accounts can unlock a device that |
| 40 | * has gone through untrusted factory reset. |
| 41 | * <p> |
| 42 | * Only a device owner or profile owner of an organization-owned device can set a factory |
| 43 | * reset protection policy for the device by calling the {@code DevicePolicyManager} method |
| 44 | * {@link DevicePolicyManager#setFactoryResetProtectionPolicy(ComponentName, |
| 45 | * FactoryResetProtectionPolicy)}}. |
| 46 | * |
| 47 | * @see DevicePolicyManager#setFactoryResetProtectionPolicy |
| 48 | * @see DevicePolicyManager#getFactoryResetProtectionPolicy |
| 49 | */ |
| 50 | public final class FactoryResetProtectionPolicy implements Parcelable { |
| 51 | |
| 52 | private static final String LOG_TAG = "FactoryResetProtectionPolicy"; |
| 53 | |
| 54 | private static final String KEY_FACTORY_RESET_PROTECTION_ACCOUNT = |
| 55 | "factory_reset_protection_account"; |
| 56 | private static final String KEY_FACTORY_RESET_PROTECTION_DISABLED = |
| 57 | "factory_reset_protection_disabled"; |
| 58 | private static final String ATTR_VALUE = "value"; |
| 59 | |
| 60 | private final List<String> mFactoryResetProtectionAccounts; |
| 61 | private final boolean mFactoryResetProtectionDisabled; |
| 62 | |
| 63 | private FactoryResetProtectionPolicy(List<String> factoryResetProtectionAccounts, |
| 64 | boolean factoryResetProtectionDisabled) { |
| 65 | mFactoryResetProtectionAccounts = factoryResetProtectionAccounts; |
| 66 | mFactoryResetProtectionDisabled = factoryResetProtectionDisabled; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Get the list of accounts that can provision a device which has been factory reset. |
| 71 | */ |
| 72 | public @NonNull List<String> getFactoryResetProtectionAccounts() { |
| 73 | return mFactoryResetProtectionAccounts; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Return whether factory reset protection for the device is disabled or not. |
| 78 | */ |
| 79 | public boolean isFactoryResetProtectionDisabled() { |
| 80 | return mFactoryResetProtectionDisabled; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Builder class for {@link FactoryResetProtectionPolicy} objects. |
| 85 | */ |
| 86 | public static class Builder { |
| 87 | private List<String> mFactoryResetProtectionAccounts; |
| 88 | private boolean mFactoryResetProtectionDisabled; |
| 89 | |
| 90 | /** |
| 91 | * Initialize a new Builder to construct a {@link FactoryResetProtectionPolicy}. |
| 92 | */ |
| 93 | public Builder() { |
| 94 | }; |
| 95 | |
| 96 | /** |
| 97 | * Sets which accounts can unlock a device that has been factory reset. |
| 98 | * <p> |
| 99 | * Once set, the consumer unlock flow will be disabled and only accounts in this list |
| 100 | * can unlock factory reset protection after untrusted factory reset. |
| 101 | * <p> |
| 102 | * It's up to the FRP management agent to interpret the {@code String} as account it |
| 103 | * supports. Please consult their relevant documentation for details. |
| 104 | * |
| 105 | * @param factoryResetProtectionAccounts list of accounts. |
| 106 | * @return the same Builder instance. |
| 107 | */ |
| 108 | @NonNull |
| 109 | public Builder setFactoryResetProtectionAccounts( |
| 110 | @NonNull List<String> factoryResetProtectionAccounts) { |
| 111 | mFactoryResetProtectionAccounts = new ArrayList<>(factoryResetProtectionAccounts); |
| 112 | return this; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Sets whether factory reset protection is disabled or not. |
| 117 | * <p> |
| 118 | * Once disabled, factory reset protection will not kick in all together when the device |
| 119 | * goes through untrusted factory reset. This applies to both the consumer unlock flow and |
| 120 | * the admin account overrides via {@link #setFactoryResetProtectionAccounts} |
| 121 | * |
| 122 | * @param factoryResetProtectionDisabled Whether the policy is disabled or not. |
| 123 | * @return the same Builder instance. |
| 124 | */ |
| 125 | @NonNull |
| 126 | public Builder setFactoryResetProtectionDisabled(boolean factoryResetProtectionDisabled) { |
| 127 | mFactoryResetProtectionDisabled = factoryResetProtectionDisabled; |
| 128 | return this; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Combines all of the attributes that have been set on this {@code Builder} |
| 133 | * |
| 134 | * @return a new {@link FactoryResetProtectionPolicy} object. |
| 135 | */ |
| 136 | @NonNull |
| 137 | public FactoryResetProtectionPolicy build() { |
| 138 | return new FactoryResetProtectionPolicy(mFactoryResetProtectionAccounts, |
| 139 | mFactoryResetProtectionDisabled); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | public String toString() { |
| 145 | return "FactoryResetProtectionPolicy{" |
| 146 | + "mFactoryResetProtectionAccounts=" + mFactoryResetProtectionAccounts |
| 147 | + ", mFactoryResetProtectionDisabled=" + mFactoryResetProtectionDisabled |
| 148 | + '}'; |
| 149 | } |
| 150 | |
| 151 | @Override |
| 152 | public void writeToParcel(@NonNull Parcel dest, @Nullable int flags) { |
| 153 | int accountsCount = mFactoryResetProtectionAccounts.size(); |
| 154 | dest.writeInt(accountsCount); |
| 155 | for (String account: mFactoryResetProtectionAccounts) { |
| 156 | dest.writeString(account); |
| 157 | } |
| 158 | dest.writeBoolean(mFactoryResetProtectionDisabled); |
| 159 | } |
| 160 | |
| 161 | @Override |
| 162 | public int describeContents() { |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | public static final @NonNull Creator<FactoryResetProtectionPolicy> CREATOR = |
| 167 | new Creator<FactoryResetProtectionPolicy>() { |
| 168 | |
| 169 | @Override |
| 170 | public FactoryResetProtectionPolicy createFromParcel(Parcel in) { |
| 171 | List<String> factoryResetProtectionAccounts = new ArrayList<>(); |
| 172 | int accountsCount = in.readInt(); |
| 173 | for (int i = 0; i < accountsCount; i++) { |
| 174 | factoryResetProtectionAccounts.add(in.readString()); |
| 175 | } |
| 176 | boolean factoryResetProtectionDisabled = in.readBoolean(); |
| 177 | |
| 178 | return new FactoryResetProtectionPolicy(factoryResetProtectionAccounts, |
| 179 | factoryResetProtectionDisabled); |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public FactoryResetProtectionPolicy[] newArray(int size) { |
| 184 | return new FactoryResetProtectionPolicy[size]; |
| 185 | } |
| 186 | }; |
| 187 | |
| 188 | /** |
| 189 | * Restore a previously saved FactoryResetProtectionPolicy from XML. |
| 190 | * <p> |
| 191 | * No validation is required on the reconstructed policy since the XML was previously |
| 192 | * created by the system server from a validated policy. |
| 193 | * @hide |
| 194 | */ |
| 195 | @Nullable |
| 196 | public static FactoryResetProtectionPolicy readFromXml(@NonNull XmlPullParser parser) { |
| 197 | try { |
| 198 | boolean factoryResetProtectionDisabled = Boolean.parseBoolean( |
| 199 | parser.getAttributeValue(null, KEY_FACTORY_RESET_PROTECTION_DISABLED)); |
| 200 | |
| 201 | List<String> factoryResetProtectionAccounts = new ArrayList<>(); |
| 202 | int outerDepth = parser.getDepth(); |
| 203 | int type; |
| 204 | while ((type = parser.next()) != END_DOCUMENT |
| 205 | && (type != END_TAG || parser.getDepth() > outerDepth)) { |
| 206 | if (type == END_TAG || type == TEXT) { |
| 207 | continue; |
| 208 | } |
| 209 | if (!parser.getName().equals(KEY_FACTORY_RESET_PROTECTION_ACCOUNT)) { |
| 210 | continue; |
| 211 | } |
| 212 | factoryResetProtectionAccounts.add( |
| 213 | parser.getAttributeValue(null, ATTR_VALUE)); |
| 214 | } |
| 215 | |
| 216 | return new FactoryResetProtectionPolicy(factoryResetProtectionAccounts, |
| 217 | factoryResetProtectionDisabled); |
| 218 | } catch (XmlPullParserException | IOException e) { |
| 219 | Log.w(LOG_TAG, "Reading from xml failed", e); |
| 220 | } |
| 221 | return null; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * @hide |
| 226 | */ |
| 227 | public void writeToXml(@NonNull XmlSerializer out) throws IOException { |
| 228 | out.attribute(null, KEY_FACTORY_RESET_PROTECTION_DISABLED, |
| 229 | Boolean.toString(mFactoryResetProtectionDisabled)); |
| 230 | for (String account : mFactoryResetProtectionAccounts) { |
| 231 | out.startTag(null, KEY_FACTORY_RESET_PROTECTION_ACCOUNT); |
| 232 | out.attribute(null, ATTR_VALUE, account); |
| 233 | out.endTag(null, KEY_FACTORY_RESET_PROTECTION_ACCOUNT); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | } |