PackageSignatures.java revision 420d58a9d867a3ce96fb4ea98bd30ee4d44eab4d
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 17package com.android.server.pm; 18 19import com.android.internal.util.XmlUtils; 20 21import org.xmlpull.v1.XmlPullParser; 22import org.xmlpull.v1.XmlPullParserException; 23import org.xmlpull.v1.XmlSerializer; 24 25import android.content.pm.PackageParser; 26import android.content.pm.PackageParser.SigningDetails.SignatureSchemeVersion; 27import android.content.pm.Signature; 28import android.util.Log; 29 30import java.io.IOException; 31import java.util.ArrayList; 32 33class PackageSignatures { 34 Signature[] mSignatures; 35 @SignatureSchemeVersion int mSignatureSchemeVersion; 36 37 PackageSignatures(PackageSignatures orig) { 38 if (orig != null && orig.mSignatures != null) { 39 mSignatures = orig.mSignatures.clone(); 40 mSignatureSchemeVersion = orig.mSignatureSchemeVersion; 41 } 42 } 43 44 PackageSignatures(PackageParser.SigningDetails signingDetails) { 45 assignSignatures(signingDetails); 46 } 47 48 PackageSignatures() { 49 } 50 51 void writeXml(XmlSerializer serializer, String tagName, 52 ArrayList<Signature> pastSignatures) throws IOException { 53 if (mSignatures == null) { 54 return; 55 } 56 serializer.startTag(null, tagName); 57 serializer.attribute(null, "count", 58 Integer.toString(mSignatures.length)); 59 serializer.attribute(null, "schemeVersion", Integer.toString(mSignatureSchemeVersion)); 60 for (int i=0; i<mSignatures.length; i++) { 61 serializer.startTag(null, "cert"); 62 final Signature sig = mSignatures[i]; 63 final int sigHash = sig.hashCode(); 64 final int numPast = pastSignatures.size(); 65 int j; 66 for (j=0; j<numPast; j++) { 67 Signature pastSig = pastSignatures.get(j); 68 if (pastSig.hashCode() == sigHash && pastSig.equals(sig)) { 69 serializer.attribute(null, "index", Integer.toString(j)); 70 break; 71 } 72 } 73 if (j >= numPast) { 74 pastSignatures.add(sig); 75 serializer.attribute(null, "index", Integer.toString(numPast)); 76 serializer.attribute(null, "key", sig.toCharsString()); 77 } 78 serializer.endTag(null, "cert"); 79 } 80 serializer.endTag(null, tagName); 81 } 82 83 void readXml(XmlPullParser parser, ArrayList<Signature> pastSignatures) 84 throws IOException, XmlPullParserException { 85 String countStr = parser.getAttributeValue(null, "count"); 86 if (countStr == null) { 87 PackageManagerService.reportSettingsProblem(Log.WARN, 88 "Error in package manager settings: <signatures> has" 89 + " no count at " + parser.getPositionDescription()); 90 XmlUtils.skipCurrentTag(parser); 91 } 92 String schemeVersionStr = parser.getAttributeValue(null, "schemeVersion"); 93 if (schemeVersionStr == null) { 94 PackageManagerService.reportSettingsProblem(Log.WARN, 95 "Error in package manager settings: <signatures> has no schemeVersion at " 96 + parser.getPositionDescription()); 97 mSignatureSchemeVersion = SignatureSchemeVersion.UNKNOWN; 98 } else { 99 mSignatureSchemeVersion = Integer.parseInt(countStr); 100 } 101 final int count = Integer.parseInt(countStr); 102 mSignatures = new Signature[count]; 103 int pos = 0; 104 105 int outerDepth = parser.getDepth(); 106 int type; 107 while ((type=parser.next()) != XmlPullParser.END_DOCUMENT 108 && (type != XmlPullParser.END_TAG 109 || parser.getDepth() > outerDepth)) { 110 if (type == XmlPullParser.END_TAG 111 || type == XmlPullParser.TEXT) { 112 continue; 113 } 114 115 String tagName = parser.getName(); 116 if (tagName.equals("cert")) { 117 if (pos < count) { 118 String index = parser.getAttributeValue(null, "index"); 119 if (index != null) { 120 try { 121 int idx = Integer.parseInt(index); 122 String key = parser.getAttributeValue(null, "key"); 123 if (key == null) { 124 if (idx >= 0 && idx < pastSignatures.size()) { 125 Signature sig = pastSignatures.get(idx); 126 if (sig != null) { 127 mSignatures[pos] = pastSignatures.get(idx); 128 pos++; 129 } else { 130 PackageManagerService.reportSettingsProblem(Log.WARN, 131 "Error in package manager settings: <cert> " 132 + "index " + index + " is not defined at " 133 + parser.getPositionDescription()); 134 } 135 } else { 136 PackageManagerService.reportSettingsProblem(Log.WARN, 137 "Error in package manager settings: <cert> " 138 + "index " + index + " is out of bounds at " 139 + parser.getPositionDescription()); 140 } 141 } else { 142 while (pastSignatures.size() <= idx) { 143 pastSignatures.add(null); 144 } 145 Signature sig = new Signature(key); 146 pastSignatures.set(idx, sig); 147 mSignatures[pos] = sig; 148 pos++; 149 } 150 } catch (NumberFormatException e) { 151 PackageManagerService.reportSettingsProblem(Log.WARN, 152 "Error in package manager settings: <cert> " 153 + "index " + index + " is not a number at " 154 + parser.getPositionDescription()); 155 } catch (IllegalArgumentException e) { 156 PackageManagerService.reportSettingsProblem(Log.WARN, 157 "Error in package manager settings: <cert> " 158 + "index " + index + " has an invalid signature at " 159 + parser.getPositionDescription() + ": " 160 + e.getMessage()); 161 } 162 } else { 163 PackageManagerService.reportSettingsProblem(Log.WARN, 164 "Error in package manager settings: <cert> has" 165 + " no index at " + parser.getPositionDescription()); 166 } 167 } else { 168 PackageManagerService.reportSettingsProblem(Log.WARN, 169 "Error in package manager settings: too " 170 + "many <cert> tags, expected " + count 171 + " at " + parser.getPositionDescription()); 172 } 173 } else { 174 PackageManagerService.reportSettingsProblem(Log.WARN, 175 "Unknown element under <cert>: " 176 + parser.getName()); 177 } 178 XmlUtils.skipCurrentTag(parser); 179 } 180 181 if (pos < count) { 182 // Should never happen -- there is an error in the written 183 // settings -- but if it does we don't want to generate 184 // a bad array. 185 Signature[] newSigs = new Signature[pos]; 186 System.arraycopy(mSignatures, 0, newSigs, 0, pos); 187 mSignatures = newSigs; 188 } 189 } 190 191 void assignSignatures(PackageParser.SigningDetails signingDetails) { 192 mSignatureSchemeVersion = signingDetails.signatureSchemeVersion; 193 if (!signingDetails.hasSignatures()) { 194 mSignatures = null; 195 return; 196 } 197 mSignatures = new Signature[signingDetails.signatures.length]; 198 for (int i=0; i<signingDetails.signatures.length; i++) { 199 mSignatures[i] = signingDetails.signatures[i]; 200 } 201 } 202 203 @Override 204 public String toString() { 205 StringBuffer buf = new StringBuffer(128); 206 buf.append("PackageSignatures{"); 207 buf.append(Integer.toHexString(System.identityHashCode(this))); 208 buf.append(" version:"); 209 buf.append(mSignatureSchemeVersion); 210 buf.append(", signatures:["); 211 if (mSignatures != null) { 212 for (int i=0; i<mSignatures.length; i++) { 213 if (i > 0) buf.append(", "); 214 buf.append(Integer.toHexString( 215 mSignatures[i].hashCode())); 216 } 217 } 218 buf.append("]}"); 219 return buf.toString(); 220 } 221}