1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/ssl/AbstractVerifier.java $ 3 * $Revision: 653041 $ 4 * $Date: 2008-05-03 03:39:28 -0700 (Sat, 03 May 2008) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.conn.ssl; 33 34 import java.util.regex.Pattern; 35 36 import java.io.IOException; 37 import java.security.cert.Certificate; 38 import java.security.cert.CertificateParsingException; 39 import java.security.cert.X509Certificate; 40 import java.util.Arrays; 41 import java.util.Collection; 42 import java.util.Iterator; 43 import java.util.LinkedList; 44 import java.util.List; 45 import java.util.Locale; 46 import java.util.logging.Logger; 47 import java.util.logging.Level; 48 49 import javax.net.ssl.SSLException; 50 import javax.net.ssl.SSLSession; 51 import javax.net.ssl.SSLSocket; 52 53 /** 54 * Abstract base class for all standard {@link X509HostnameVerifier} 55 * implementations. 56 * 57 * @author Julius Davies 58 * 59 * @deprecated Please use {@link java.net.URL#openConnection} instead. 60 * Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a> 61 * for further details. 62 */ 63 @Deprecated 64 public abstract class AbstractVerifier implements X509HostnameVerifier { 65 66 private static final Pattern IPV4_PATTERN = Pattern.compile( 67 "^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$"); 68 69 /** 70 * This contains a list of 2nd-level domains that aren't allowed to 71 * have wildcards when combined with country-codes. 72 * For example: [*.co.uk]. 73 * <p/> 74 * The [*.co.uk] problem is an interesting one. Should we just hope 75 * that CA's would never foolishly allow such a certificate to happen? 76 * Looks like we're the only implementation guarding against this. 77 * Firefox, Curl, Sun Java 1.4, 5, 6 don't bother with this check. 78 */ 79 private final static String[] BAD_COUNTRY_2LDS = 80 { "ac", "co", "com", "ed", "edu", "go", "gouv", "gov", "info", 81 "lg", "ne", "net", "or", "org" }; 82 83 static { 84 // Just in case developer forgot to manually sort the array. :-) 85 Arrays.sort(BAD_COUNTRY_2LDS); 86 } 87 88 public AbstractVerifier() { 89 super(); 90 } 91 92 public final void verify(String host, SSLSocket ssl) 93 throws IOException { 94 if(host == null) { 95 throw new NullPointerException("host to verify is null"); 96 } 97 98 SSLSession session = ssl.getSession(); 99 Certificate[] certs = session.getPeerCertificates(); 100 X509Certificate x509 = (X509Certificate) certs[0]; 101 verify(host, x509); 102 } 103 104 public final boolean verify(String host, SSLSession session) { 105 try { 106 Certificate[] certs = session.getPeerCertificates(); 107 X509Certificate x509 = (X509Certificate) certs[0]; 108 verify(host, x509); 109 return true; 110 } 111 catch(SSLException e) { 112 return false; 113 } 114 } 115 116 public final void verify(String host, X509Certificate cert) 117 throws SSLException { 118 String[] cns = getCNs(cert); 119 String[] subjectAlts = getDNSSubjectAlts(cert); 120 verify(host, cns, subjectAlts); 121 } 122 123 public final void verify(final String host, final String[] cns, 124 final String[] subjectAlts, 125 final boolean strictWithSubDomains) 126 throws SSLException { 127 128 // Build the list of names we're going to check. Our DEFAULT and 129 // STRICT implementations of the HostnameVerifier only use the 130 // first CN provided. All other CNs are ignored. 131 // (Firefox, wget, curl, Sun Java 1.4, 5, 6 all work this way). 132 LinkedList<String> names = new LinkedList<String>(); 133 if(cns != null && cns.length > 0 && cns[0] != null) { 134 names.add(cns[0]); 135 } 136 if(subjectAlts != null) { 137 for (String subjectAlt : subjectAlts) { 138 if (subjectAlt != null) { 139 names.add(subjectAlt); 140 } 141 } 142 } 143 144 if(names.isEmpty()) { 145 String msg = "Certificate for <" + host + "> doesn't contain CN or DNS subjectAlt"; 146 throw new SSLException(msg); 147 } 148 149 // StringBuffer for building the error message. 150 StringBuffer buf = new StringBuffer(); 151 152 // We're can be case-insensitive when comparing the host we used to 153 // establish the socket to the hostname in the certificate. 154 String hostName = host.trim().toLowerCase(Locale.ENGLISH); 155 boolean match = false; 156 for(Iterator<String> it = names.iterator(); it.hasNext();) { 157 // Don't trim the CN, though! 158 String cn = it.next(); 159 cn = cn.toLowerCase(Locale.ENGLISH); 160 // Store CN in StringBuffer in case we need to report an error. 161 buf.append(" <"); 162 buf.append(cn); 163 buf.append('>'); 164 if(it.hasNext()) { 165 buf.append(" OR"); 166 } 167 168 // The CN better have at least two dots if it wants wildcard 169 // action. It also can't be [*.co.uk] or [*.co.jp] or 170 // [*.org.uk], etc... 171 boolean doWildcard = cn.startsWith("*.") && 172 cn.indexOf('.', 2) != -1 && 173 acceptableCountryWildcard(cn) && 174 !isIPv4Address(host); 175 176 if(doWildcard) { 177 match = hostName.endsWith(cn.substring(1)); 178 if(match && strictWithSubDomains) { 179 // If we're in strict mode, then [*.foo.com] is not 180 // allowed to match [a.b.foo.com] 181 match = countDots(hostName) == countDots(cn); 182 } 183 } else { 184 match = hostName.equals(cn); 185 } 186 if(match) { 187 break; 188 } 189 } 190 if(!match) { 191 throw new SSLException("hostname in certificate didn't match: <" + host + "> !=" + buf); 192 } 193 } 194 195 public static boolean acceptableCountryWildcard(String cn) { 196 int cnLen = cn.length(); 197 if(cnLen >= 7 && cnLen <= 9) { 198 // Look for the '.' in the 3rd-last position: 199 if(cn.charAt(cnLen - 3) == '.') { 200 // Trim off the [*.] and the [.XX]. 201 String s = cn.substring(2, cnLen - 3); 202 // And test against the sorted array of bad 2lds: 203 int x = Arrays.binarySearch(BAD_COUNTRY_2LDS, s); 204 return x < 0; 205 } 206 } 207 return true; 208 } 209 210 public static String[] getCNs(X509Certificate cert) { 211 AndroidDistinguishedNameParser dnParser = 212 new AndroidDistinguishedNameParser(cert.getSubjectX500Principal()); 213 List<String> cnList = dnParser.getAllMostSpecificFirst("cn"); 214 215 if(!cnList.isEmpty()) { 216 String[] cns = new String[cnList.size()]; 217 cnList.toArray(cns); 218 return cns; 219 } else { 220 return null; 221 } 222 } 223 224 225 /** 226 * Extracts the array of SubjectAlt DNS names from an X509Certificate. 227 * Returns null if there aren't any. 228 * <p/> 229 * Note: Java doesn't appear able to extract international characters 230 * from the SubjectAlts. It can only extract international characters 231 * from the CN field. 232 * <p/> 233 * (Or maybe the version of OpenSSL I'm using to test isn't storing the 234 * international characters correctly in the SubjectAlts?). 235 * 236 * @param cert X509Certificate 237 * @return Array of SubjectALT DNS names stored in the certificate. 238 */ 239 public static String[] getDNSSubjectAlts(X509Certificate cert) { 240 LinkedList<String> subjectAltList = new LinkedList<String>(); 241 Collection<List<?>> c = null; 242 try { 243 c = cert.getSubjectAlternativeNames(); 244 } 245 catch(CertificateParsingException cpe) { 246 Logger.getLogger(AbstractVerifier.class.getName()) 247 .log(Level.FINE, "Error parsing certificate.", cpe); 248 } 249 if(c != null) { 250 for (List<?> aC : c) { 251 List<?> list = aC; 252 int type = ((Integer) list.get(0)).intValue(); 253 // If type is 2, then we've got a dNSName 254 if (type == 2) { 255 String s = (String) list.get(1); 256 subjectAltList.add(s); 257 } 258 } 259 } 260 if(!subjectAltList.isEmpty()) { 261 String[] subjectAlts = new String[subjectAltList.size()]; 262 subjectAltList.toArray(subjectAlts); 263 return subjectAlts; 264 } else { 265 return null; 266 } 267 } 268 269 /** 270 * Counts the number of dots "." in a string. 271 * @param s string to count dots from 272 * @return number of dots 273 */ 274 public static int countDots(final String s) { 275 int count = 0; 276 for(int i = 0; i < s.length(); i++) { 277 if(s.charAt(i) == '.') { 278 count++; 279 } 280 } 281 return count; 282 } 283 284 private static boolean isIPv4Address(final String input) { 285 return IPV4_PATTERN.matcher(input).matches(); 286 } 287 } 288
