mirror of
https://github.com/moparisthebest/k-9
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Eliminate DomainNameChecker
There's no need to maintain our own implementation when comparable classes already exist in the Android API. StrictHostnameVerifier is used instead.
This commit is contained in:
Joe Steele
parent
6f14294164
commit
7dfbd906c9
@ -1,280 +0,0 @@
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/*
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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 android.net.http.SslCertificate;
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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.List;
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import java.util.Locale;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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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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private static Pattern QUICK_IP_PATTERN;
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static {
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try {
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QUICK_IP_PATTERN = Pattern.compile("^[a-f0-9\\.:]+$");
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} catch (PatternSyntaxException e) {
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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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if ((certificate == null) || (thisDomain == null)
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|| thisDomain.isEmpty()) {
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return false;
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}
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thisDomain = thisDomain.toLowerCase(Locale.US);
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if (!isIpAddress(thisDomain)) {
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return matchDns(certificate, thisDomain);
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} else {
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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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if ((domain == null) || domain.isEmpty()) {
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return false;
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}
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boolean rval;
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try {
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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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rval = domain.equals(InetAddress.getByName(domain)
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.getHostAddress());
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}
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} catch (UnknownHostException e) {
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String errorMessage = e.getMessage();
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if (errorMessage == null) {
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errorMessage = "unknown host exception";
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}
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if (K9.DEBUG) {
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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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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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if (K9.DEBUG) {
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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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Collection<List<?>> subjectAltNames = certificate.getSubjectAlternativeNames();
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if (subjectAltNames != null) {
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for (List<?> altNameEntry : subjectAltNames) {
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if ((altNameEntry != null) && (2 <= altNameEntry.size())) {
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Integer altNameType = (Integer)(altNameEntry.get(0));
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if (altNameType != null && altNameType.intValue() == ALT_IPA_NAME) {
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String altName = (String)(altNameEntry.get(1));
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if (altName != null) {
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if (K9.DEBUG) {
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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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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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} catch (CertificateParsingException e) {
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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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boolean hasDns = false;
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try {
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Collection<List<?>> subjectAltNames = certificate.getSubjectAlternativeNames();
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if (subjectAltNames != null) {
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for (List<?> altNameEntry : subjectAltNames) {
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if ((altNameEntry != null) && (2 <= altNameEntry.size())) {
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Integer altNameType = (Integer)(altNameEntry.get(0));
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if (altNameType != null && altNameType.intValue() == ALT_DNS_NAME) {
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hasDns = true;
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String altName = (String)(altNameEntry.get(1));
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if (altName != null && matchDns(thisDomain, altName)) {
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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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} catch (CertificateParsingException e) {
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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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String errorMessage = e.getMessage();
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if (errorMessage == null) {
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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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SslCertificate sslCertificate = new SslCertificate(certificate);
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return matchDns(thisDomain, sslCertificate.getIssuedTo().getCName());
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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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if (K9.DEBUG) {
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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.isEmpty()
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|| (thatDomain == null) || thatDomain.isEmpty()) {
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return false;
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}
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thatDomain = thatDomain.toLowerCase(Locale.US);
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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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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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for (int i = thatDomainTokensNum - 1; i >= 0; --i) {
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rval = thisDomainTokens[i].equals(thatDomainTokens[i]);
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if (!rval) {
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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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rval = thatDomainTokens[0].equals("*");
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if (!rval) {
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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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if ((thisDomainToken != null) && (thatDomainToken != null)) {
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int starIndex = thatDomainToken.indexOf('*');
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if (starIndex >= 0) {
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if (thatDomainToken.length() - 1 <= thisDomainToken.length()) {
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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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@ -3,12 +3,15 @@ package com.fsck.k9.net.ssl;
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import android.util.Log;
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import com.fsck.k9.helper.DomainNameChecker;
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import com.fsck.k9.mail.CertificateChainException;
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import com.fsck.k9.security.LocalKeyStore;
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import javax.net.ssl.SSLException;
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import javax.net.ssl.TrustManager;
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import javax.net.ssl.X509TrustManager;
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import org.apache.http.conn.ssl.StrictHostnameVerifier;
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import java.security.KeyStore;
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import java.security.KeyStoreException;
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import java.security.NoSuchAlgorithmException;
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@ -58,31 +61,25 @@ public final class TrustManagerFactory {
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public void checkServerTrusted(X509Certificate[] chain, String authType)
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throws CertificateException {
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String message = null;
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boolean foundInGlobalKeyStore = false;
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X509Certificate certificate = chain[0];
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try {
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defaultTrustManager.checkServerTrusted(chain, authType);
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foundInGlobalKeyStore = true;
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new StrictHostnameVerifier().verify(mHost, certificate);
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return;
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} catch (CertificateException e) {
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// cert. chain can't be validated
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message = e.getMessage();
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} catch (SSLException e) {
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// host name doesn't match certificate
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message = e.getMessage();
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}
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X509Certificate certificate = chain[0];
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// Check the local key store if we couldn't verify the certificate using the global
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// key store or if the host name doesn't match the certificate name
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if (foundInGlobalKeyStore
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&& DomainNameChecker.match(certificate, mHost)
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|| keyStore.isValidCertificate(certificate, mHost, mPort)) {
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return;
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if (!keyStore.isValidCertificate(certificate, mHost, mPort)) {
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throw new CertificateChainException(message, chain);
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}
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if (message == null) {
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message = (foundInGlobalKeyStore) ?
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"Certificate domain name does not match " + mHost :
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"Couldn't find certificate in local key store";
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}
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throw new CertificateChainException(message, chain);
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}
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public X509Certificate[] getAcceptedIssuers() {
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