mirror of
https://github.com/moparisthebest/k-9
synced 2024-11-11 20:15:03 -05:00
356 lines
12 KiB
Java
356 lines
12 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.fsck.k9.helper;
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import org.bouncycastle.asn1.x509.X509Name;
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import android.util.Log;
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import com.fsck.k9.K9;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.security.cert.X509Certificate;
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import java.security.cert.CertificateParsingException;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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import java.util.Vector;
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/**
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* Implements basic domain-name validation as specified by RFC2818.
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*/
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public class DomainNameChecker
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{
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private static Pattern QUICK_IP_PATTERN;
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static
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{
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try
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{
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QUICK_IP_PATTERN = Pattern.compile("^[a-f0-9\\.:]+$");
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}
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catch (PatternSyntaxException e)
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{
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}
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}
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private static final int ALT_DNS_NAME = 2;
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private static final int ALT_IPA_NAME = 7;
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/**
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* Checks the site certificate against the domain name of the site being
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* visited
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*
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* @param certificate
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* The certificate to check
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* @param thisDomain
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* The domain name of the site being visited
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* @return True iff if there is a domain match as specified by RFC2818
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*/
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public static boolean match(X509Certificate certificate, String thisDomain)
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{
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if ((certificate == null) || (thisDomain == null)
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|| (thisDomain.length() == 0))
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{
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return false;
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}
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thisDomain = thisDomain.toLowerCase();
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if (!isIpAddress(thisDomain))
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{
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return matchDns(certificate, thisDomain);
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}
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else
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{
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return matchIpAddress(certificate, thisDomain);
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}
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}
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/**
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* @return True iff the domain name is specified as an IP address
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*/
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private static boolean isIpAddress(String domain)
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{
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boolean rval = ((domain != null) && (domain.length() != 0));
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if (rval)
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{
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try
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{
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// do a quick-dirty IP match first to avoid DNS lookup
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rval = QUICK_IP_PATTERN.matcher(domain).matches();
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if (rval)
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{
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rval = domain.equals(InetAddress.getByName(domain)
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.getHostAddress());
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}
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}
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catch (UnknownHostException e)
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{
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String errorMessage = e.getMessage();
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if (errorMessage == null)
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{
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errorMessage = "unknown host exception";
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}
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if (K9.DEBUG)
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{
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Log.v(K9.LOG_TAG, "DomainNameChecker.isIpAddress(): "
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+ errorMessage);
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}
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rval = false;
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}
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}
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return rval;
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}
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/**
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* Checks the site certificate against the IP domain name of the site being
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* visited
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*
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* @param certificate
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* The certificate to check
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* @param thisDomain
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* The DNS domain name of the site being visited
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* @return True iff if there is a domain match as specified by RFC2818
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*/
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private static boolean matchIpAddress(X509Certificate certificate, String thisDomain)
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{
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if (K9.DEBUG)
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{
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Log.v(K9.LOG_TAG, "DomainNameChecker.matchIpAddress(): this domain: " + thisDomain);
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}
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try
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{
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Collection<?> subjectAltNames = certificate.getSubjectAlternativeNames();
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if (subjectAltNames != null)
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{
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Iterator<?> i = subjectAltNames.iterator();
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while (i.hasNext())
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{
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List<?> altNameEntry = (List<?>)(i.next());
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if ((altNameEntry != null) && (2 <= altNameEntry.size()))
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{
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Integer altNameType = (Integer)(altNameEntry.get(0));
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if (altNameType != null)
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{
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if (altNameType.intValue() == ALT_IPA_NAME)
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{
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String altName = (String)(altNameEntry.get(1));
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if (altName != null)
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{
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if (K9.DEBUG)
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{
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Log.v(K9.LOG_TAG, "alternative IP: " + altName);
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}
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if (thisDomain.equalsIgnoreCase(altName))
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{
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return true;
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}
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}
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}
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}
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}
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}
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}
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}
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catch (CertificateParsingException e)
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{
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}
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return false;
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}
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/**
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* Checks the site certificate against the DNS domain name of the site being
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* visited
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*
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* @param certificate
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* The certificate to check
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* @param thisDomain
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* The DNS domain name of the site being visited
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* @return True iff if there is a domain match as specified by RFC2818
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*/
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private static boolean matchDns(X509Certificate certificate, String thisDomain)
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{
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boolean hasDns = false;
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try
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{
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Collection<?> subjectAltNames = certificate.getSubjectAlternativeNames();
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if (subjectAltNames != null)
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{
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Iterator<?> i = subjectAltNames.iterator();
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while (i.hasNext())
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{
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List<?> altNameEntry = (List<?>)(i.next());
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if ((altNameEntry != null) && (2 <= altNameEntry.size()))
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{
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Integer altNameType = (Integer)(altNameEntry.get(0));
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if (altNameType != null)
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{
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if (altNameType.intValue() == ALT_DNS_NAME)
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{
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hasDns = true;
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String altName = (String)(altNameEntry.get(1));
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if (altName != null)
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{
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if (matchDns(thisDomain, altName))
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{
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return true;
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}
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}
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}
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}
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}
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}
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}
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}
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catch (CertificateParsingException e)
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{
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// one way we can get here is if an alternative name starts with
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// '*' character, which is contrary to one interpretation of the
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// spec (a valid DNS name must start with a letter); there is no
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// good way around this, and in order to be compatible we proceed
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// to check the common name (ie, ignore alternative names)
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if (K9.DEBUG)
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{
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String errorMessage = e.getMessage();
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if (errorMessage == null)
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{
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errorMessage = "failed to parse certificate";
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}
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Log.v(K9.LOG_TAG, "DomainNameChecker.matchDns(): "
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+ errorMessage);
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}
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}
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if (!hasDns)
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{
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X509Name xName = new X509Name(certificate.getSubjectDN().getName());
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Vector<?> val = xName.getValues();
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Vector<?> oid = xName.getOIDs();
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for (int i = 0; i < oid.size(); i++)
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{
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if (oid.elementAt(i).equals(X509Name.CN))
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{
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return matchDns(thisDomain, (String)(val.elementAt(i)));
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}
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}
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}
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return false;
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}
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/**
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* @param thisDomain
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* The domain name of the site being visited
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* @param thatDomain
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* The domain name from the certificate
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* @return True iff thisDomain matches thatDomain as specified by RFC2818
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*/
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private static boolean matchDns(String thisDomain, String thatDomain)
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{
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if (K9.DEBUG)
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{
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Log.v(K9.LOG_TAG, "DomainNameChecker.matchDns():"
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+ " this domain: " + thisDomain + " that domain: "
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+ thatDomain);
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}
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if ((thisDomain == null) || (thisDomain.length() == 0)
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|| (thatDomain == null) || (thatDomain.length() == 0))
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{
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return false;
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}
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thatDomain = thatDomain.toLowerCase();
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// (a) domain name strings are equal, ignoring case: X matches X
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boolean rval = thisDomain.equals(thatDomain);
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if (!rval)
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{
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String[] thisDomainTokens = thisDomain.split("\\.");
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String[] thatDomainTokens = thatDomain.split("\\.");
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int thisDomainTokensNum = thisDomainTokens.length;
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int thatDomainTokensNum = thatDomainTokens.length;
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// (b) OR thatHost is a '.'-suffix of thisHost: Z.Y.X matches X
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if (thisDomainTokensNum >= thatDomainTokensNum)
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{
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for (int i = thatDomainTokensNum - 1; i >= 0; --i)
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{
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rval = thisDomainTokens[i].equals(thatDomainTokens[i]);
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if (!rval)
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{
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// (c) OR we have a special *-match:
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// Z.Y.X matches *.Y.X but does not match *.X
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rval = ((i == 0) && (thisDomainTokensNum == thatDomainTokensNum));
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if (rval)
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{
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rval = thatDomainTokens[0].equals("*");
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if (!rval)
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{
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// (d) OR we have a *-component match:
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// f*.com matches foo.com but not bar.com
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rval = domainTokenMatch(thisDomainTokens[0],
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thatDomainTokens[0]);
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}
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}
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break;
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}
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}
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}
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}
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return rval;
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}
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/**
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* @param thisDomainToken
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* The domain token from the current domain name
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* @param thatDomainToken
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* The domain token from the certificate
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* @return True iff thisDomainToken matches thatDomainToken, using the
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* wildcard match as specified by RFC2818-3.1. For example, f*.com
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* must match foo.com but not bar.com
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*/
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private static boolean domainTokenMatch(String thisDomainToken, String thatDomainToken)
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{
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if ((thisDomainToken != null) && (thatDomainToken != null))
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{
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int starIndex = thatDomainToken.indexOf('*');
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if (starIndex >= 0)
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{
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if (thatDomainToken.length() - 1 <= thisDomainToken.length())
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{
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String prefix = thatDomainToken.substring(0, starIndex);
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String suffix = thatDomainToken.substring(starIndex + 1);
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return thisDomainToken.startsWith(prefix)
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&& thisDomainToken.endsWith(suffix);
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}
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}
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}
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return false;
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}
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}
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