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      1 /*
      2  * Copyright (C) 2012 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.server.updates;
     18 
     19 import com.android.internal.util.HexDump;
     20 
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.test.AndroidTestCase;
     24 import android.provider.Settings;
     25 import android.util.Base64;
     26 import android.util.Log;
     27 
     28 import java.io.ByteArrayInputStream;
     29 import java.io.File;
     30 import java.io.FileInputStream;
     31 import java.io.FileOutputStream;
     32 import java.io.FileWriter;
     33 import java.io.IOException;
     34 import java.io.InputStream;
     35 import java.security.cert.CertificateFactory;
     36 import java.security.cert.Certificate;
     37 import java.security.cert.X509Certificate;
     38 import java.security.MessageDigest;
     39 import java.security.NoSuchAlgorithmException;
     40 import java.security.PrivateKey;
     41 import java.security.Signature;
     42 import java.security.spec.PKCS8EncodedKeySpec;
     43 import java.security.KeyFactory;
     44 import java.util.HashSet;
     45 import java.io.*;
     46 import libcore.io.IoUtils;
     47 
     48 /**
     49  * Tests for {@link com.android.server.CertPinInstallReceiver}
     50  */
     51 public class CertPinInstallReceiverTest extends AndroidTestCase {
     52 
     53     private static final String TAG = "CertPinInstallReceiverTest";
     54 
     55     private static final String PINLIST_ROOT = System.getenv("ANDROID_DATA") + "/misc/keychain/";
     56 
     57     public static final String PINLIST_CONTENT_PATH = PINLIST_ROOT + "pins";
     58     public static final String PINLIST_METADATA_PATH = PINLIST_CONTENT_PATH + "metadata";
     59 
     60     public static final String PINLIST_CONTENT_URL_KEY = "pinlist_content_url";
     61     public static final String PINLIST_METADATA_URL_KEY = "pinlist_metadata_url";
     62     public static final String PINLIST_CERTIFICATE_KEY = "config_update_certificate";
     63     public static final String PINLIST_VERSION_KEY = "pinlist_version";
     64 
     65     private static final String EXTRA_CONTENT_PATH = "CONTENT_PATH";
     66     private static final String EXTRA_REQUIRED_HASH = "REQUIRED_HASH";
     67     private static final String EXTRA_SIGNATURE = "SIGNATURE";
     68     private static final String EXTRA_VERSION_NUMBER = "VERSION";
     69 
     70     public static final String TEST_CERT = "" +
     71                     "MIIDsjCCAxugAwIBAgIJAPLf2gS0zYGUMA0GCSqGSIb3DQEBBQUAMIGYMQswCQYDVQQGEwJVUzET" +
     72                     "MBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEPMA0GA1UEChMGR29v" +
     73                     "Z2xlMRAwDgYDVQQLEwd0ZXN0aW5nMRYwFAYDVQQDEw1HZXJlbXkgQ29uZHJhMSEwHwYJKoZIhvcN" +
     74                     "AQkBFhJnY29uZHJhQGdvb2dsZS5jb20wHhcNMTIwNzE0MTc1MjIxWhcNMTIwODEzMTc1MjIxWjCB" +
     75                     "mDELMAkGA1UEBhMCVVMxEzARBgNVBAgTCkNhbGlmb3JuaWExFjAUBgNVBAcTDU1vdW50YWluIFZp" +
     76                     "ZXcxDzANBgNVBAoTBkdvb2dsZTEQMA4GA1UECxMHdGVzdGluZzEWMBQGA1UEAxMNR2VyZW15IENv" +
     77                     "bmRyYTEhMB8GCSqGSIb3DQEJARYSZ2NvbmRyYUBnb29nbGUuY29tMIGfMA0GCSqGSIb3DQEBAQUA" +
     78                     "A4GNADCBiQKBgQCjGGHATBYlmas+0sEECkno8LZ1KPglb/mfe6VpCT3GhSr+7br7NG/ZwGZnEhLq" +
     79                     "E7YIH4fxltHmQC3Tz+jM1YN+kMaQgRRjo/LBCJdOKaMwUbkVynAH6OYsKevjrOPk8lfM5SFQzJMG" +
     80                     "sA9+Tfopr5xg0BwZ1vA/+E3mE7Tr3M2UvwIDAQABo4IBADCB/TAdBgNVHQ4EFgQUhzkS9E6G+x8W" +
     81                     "L4EsmRjDxu28tHUwgc0GA1UdIwSBxTCBwoAUhzkS9E6G+x8WL4EsmRjDxu28tHWhgZ6kgZswgZgx" +
     82                     "CzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRYwFAYDVQQHEw1Nb3VudGFpbiBWaWV3" +
     83                     "MQ8wDQYDVQQKEwZHb29nbGUxEDAOBgNVBAsTB3Rlc3RpbmcxFjAUBgNVBAMTDUdlcmVteSBDb25k" +
     84                     "cmExITAfBgkqhkiG9w0BCQEWEmdjb25kcmFAZ29vZ2xlLmNvbYIJAPLf2gS0zYGUMAwGA1UdEwQF" +
     85                     "MAMBAf8wDQYJKoZIhvcNAQEFBQADgYEAYiugFDmbDOQ2U/+mqNt7o8ftlEo9SJrns6O8uTtK6AvR" +
     86                     "orDrR1AXTXkuxwLSbmVfedMGOZy7Awh7iZa8hw5x9XmUudfNxvmrKVEwGQY2DZ9PXbrnta/dwbhK" +
     87                     "mWfoepESVbo7CKIhJp8gRW0h1Z55ETXD57aGJRvQS4pxkP8ANhM=";
     88 
     89 
     90     public static final String TEST_KEY = "" +
     91                     "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAKMYYcBMFiWZqz7SwQQKSejwtnUo" +
     92                     "+CVv+Z97pWkJPcaFKv7tuvs0b9nAZmcSEuoTtggfh/GW0eZALdPP6MzVg36QxpCBFGOj8sEIl04p" +
     93                     "ozBRuRXKcAfo5iwp6+Os4+TyV8zlIVDMkwawD35N+imvnGDQHBnW8D/4TeYTtOvczZS/AgMBAAEC" +
     94                     "gYBxwFalNSwZK3WJipq+g6KLCiBn1JxGGDQlLKrweFaSuFyFky9fd3IvkIabirqQchD612sMb+GT" +
     95                     "0t1jptW6z4w2w6++IW0A3apDOCwoD+uvDBXrbFqI0VbyAWUNqHVdaFFIRk2IHGEE6463mGRdmILX" +
     96                     "IlCd/85RTHReg4rl/GFqWQJBANgLAIR4pWbl5Gm+DtY18wp6Q3pJAAMkmP/lISCBIidu1zcqYIKt" +
     97                     "PoDW4Knq9xnhxPbXrXKv4YzZWHBK8GkKhQ0CQQDBQnXufQcMew+PwiS0oJvS+eQ6YJwynuqG2ejg" +
     98                     "WE+T7489jKtscRATpUXpZUYmDLGg9bLt7L62hFvFSj2LO2X7AkBcdrD9AWnBFWlh/G77LVHczSEu" +
     99                     "KCoyLiqxcs5vy/TjLaQ8vw1ZQG580/qJnr+tOxyCjSJ18GK3VppsTRaBznfNAkB3nuCKNp9HTWCL" +
    100                     "dfrsRsFMrFpk++mSt6SoxXaMbn0LL2u1CD4PCEiQMGt+lK3/3TmRTKNs+23sYS7Ahjxj0udDAkEA" +
    101                     "p57Nj65WNaWeYiOfTwKXkLj8l29H5NbaGWxPT0XkWr4PvBOFZVH/wj0/qc3CMVGnv11+DyO+QUCN" +
    102                     "SqBB5aRe8g==";
    103 
    104     private void overrideSettings(String key, String value) throws Exception {
    105         assertTrue(Settings.Secure.putString(mContext.getContentResolver(), key, value));
    106         Thread.sleep(1000);
    107     }
    108 
    109     private void overrideCert(String value) throws Exception {
    110         overrideSettings(PINLIST_CERTIFICATE_KEY, value);
    111     }
    112 
    113     private String readPins() throws Exception {
    114         return IoUtils.readFileAsString(PINLIST_CONTENT_PATH);
    115     }
    116 
    117     private String readCurrentVersion() throws Exception {
    118         return IoUtils.readFileAsString("/data/misc/keychain/metadata/version");
    119     }
    120 
    121     private String getNextVersion() throws Exception {
    122         int currentVersion = Integer.parseInt(readCurrentVersion());
    123         return Integer.toString(currentVersion + 1);
    124     }
    125 
    126     private static String getCurrentHash(String content) throws Exception {
    127         if (content == null) {
    128             return "0";
    129         }
    130         MessageDigest dgst = MessageDigest.getInstance("SHA512");
    131         byte[] encoded = content.getBytes();
    132         byte[] fingerprint = dgst.digest(encoded);
    133         return HexDump.toHexString(fingerprint, false);
    134     }
    135 
    136     private static String getHashOfCurrentContent() throws Exception {
    137         String content = IoUtils.readFileAsString("/data/misc/keychain/pins");
    138         return getCurrentHash(content);
    139     }
    140 
    141     private PrivateKey createKey() throws Exception {
    142         byte[] derKey = Base64.decode(TEST_KEY.getBytes(), Base64.DEFAULT);
    143         PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(derKey);
    144         KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    145         return (PrivateKey) keyFactory.generatePrivate(keySpec);
    146     }
    147 
    148     private X509Certificate createCertificate() throws Exception {
    149         byte[] derCert = Base64.decode(TEST_CERT.getBytes(), Base64.DEFAULT);
    150         InputStream istream = new ByteArrayInputStream(derCert);
    151         CertificateFactory cf = CertificateFactory.getInstance("X.509");
    152         return (X509Certificate) cf.generateCertificate(istream);
    153     }
    154 
    155     private String makeTemporaryContentFile(String content) throws Exception {
    156         FileOutputStream fw = mContext.openFileOutput("content.txt", mContext.MODE_WORLD_READABLE);
    157         fw.write(content.getBytes(), 0, content.length());
    158         fw.close();
    159         return mContext.getFilesDir() + "/content.txt";
    160     }
    161 
    162     private String createSignature(String content, String version, String requiredHash)
    163                                    throws Exception {
    164         Signature signer = Signature.getInstance("SHA512withRSA");
    165         signer.initSign(createKey());
    166         signer.update(content.trim().getBytes());
    167         signer.update(version.trim().getBytes());
    168         signer.update(requiredHash.getBytes());
    169         String sig = new String(Base64.encode(signer.sign(), Base64.DEFAULT));
    170         assertEquals(true,
    171                      verifySignature(content, version, requiredHash, sig, createCertificate()));
    172         return sig;
    173     }
    174 
    175     public boolean verifySignature(String content, String version, String requiredPrevious,
    176                                    String signature, X509Certificate cert) throws Exception {
    177         Signature signer = Signature.getInstance("SHA512withRSA");
    178         signer.initVerify(cert);
    179         signer.update(content.trim().getBytes());
    180         signer.update(version.trim().getBytes());
    181         signer.update(requiredPrevious.trim().getBytes());
    182         return signer.verify(Base64.decode(signature.getBytes(), Base64.DEFAULT));
    183     }
    184 
    185     private void sendIntent(String contentPath, String version, String required, String sig) {
    186         Intent i = new Intent();
    187         i.setAction("android.intent.action.UPDATE_PINS");
    188         i.putExtra(EXTRA_CONTENT_PATH, contentPath);
    189         i.putExtra(EXTRA_VERSION_NUMBER, version);
    190         i.putExtra(EXTRA_REQUIRED_HASH, required);
    191         i.putExtra(EXTRA_SIGNATURE, sig);
    192         mContext.sendBroadcast(i);
    193     }
    194 
    195     private String runTest(String cert, String content, String version, String required, String sig)
    196                            throws Exception {
    197         Log.e(TAG, "started test");
    198         overrideCert(cert);
    199         String contentPath = makeTemporaryContentFile(content);
    200         sendIntent(contentPath, version, required, sig);
    201         Thread.sleep(1000);
    202         return readPins();
    203     }
    204 
    205     private String runTestWithoutSig(String cert, String content, String version, String required)
    206                                      throws Exception {
    207         String sig = createSignature(content, version, required);
    208         return runTest(cert, content, version, required, sig);
    209     }
    210 
    211     public void testOverwritePinlist() throws Exception {
    212         Log.e(TAG, "started testOverwritePinList");
    213         assertEquals("abcde", runTestWithoutSig(TEST_CERT, "abcde", getNextVersion(), getHashOfCurrentContent()));
    214         Log.e(TAG, "started testOverwritePinList");
    215     }
    216 
    217    public void testBadSignatureFails() throws Exception {
    218         Log.e(TAG, "started testOverwritePinList");
    219         String text = "blahblah";
    220         runTestWithoutSig(TEST_CERT, text, getNextVersion(), getHashOfCurrentContent());
    221         assertEquals(text, runTest(TEST_CERT, "bcdef", getNextVersion(), getCurrentHash(text), ""));
    222         Log.e(TAG, "started testOverwritePinList");
    223     }
    224 
    225     public void testBadRequiredHashFails() throws Exception {
    226         runTestWithoutSig(TEST_CERT, "blahblahblah", getNextVersion(), getHashOfCurrentContent());
    227         assertEquals("blahblahblah", runTestWithoutSig(TEST_CERT, "cdefg", getNextVersion(), "0"));
    228         Log.e(TAG, "started testOverwritePinList");
    229     }
    230 
    231     public void testBadVersionFails() throws Exception {
    232         String text = "blahblahblahblah";
    233         String version = getNextVersion();
    234         runTestWithoutSig(TEST_CERT, text, version, getHashOfCurrentContent());
    235         assertEquals(text, runTestWithoutSig(TEST_CERT, "defgh", version, getCurrentHash(text)));
    236         Log.e(TAG, "started testOverwritePinList");
    237     }
    238 
    239     public void testOverrideRequiredHash() throws Exception {
    240         runTestWithoutSig(TEST_CERT, "blahblahblah", getNextVersion(), getHashOfCurrentContent());
    241         assertEquals("blahblahblah", runTestWithoutSig(TEST_CERT, "cdefg", "NONE", "0"));
    242         Log.e(TAG, "started testOverwritePinList");
    243     }
    244 
    245 }
    246