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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.internal.tls
import okhttp3.internal.canParseAsIpAddress
import okhttp3.internal.toCanonicalHost
import okio.utf8Size
import java.security.cert.CertificateParsingException
import java.security.cert.X509Certificate
import java.util.Locale
import javax.net.ssl.HostnameVerifier
import javax.net.ssl.SSLException
import javax.net.ssl.SSLSession
import okhttp3.internal.lowercase
/**
* A HostnameVerifier consistent with [RFC 2818][rfc_2818].
*
* [rfc_2818]: http://www.ietf.org/rfc/rfc2818.txt
*/
@Suppress("NAME_SHADOWING")
object OkHostnameVerifier : HostnameVerifier {
private const val ALT_DNS_NAME = 2
private const val ALT_IPA_NAME = 7
override fun verify(host: String, session: SSLSession): Boolean {
return if (!host.isAscii()) {
false
} else {
try {
verify(host, session.peerCertificates[0] as X509Certificate)
} catch (_: SSLException) {
false
}
}
}
fun verify(host: String, certificate: X509Certificate): Boolean {
return when {
host.canParseAsIpAddress() -> verifyIpAddress(host, certificate)
else -> verifyHostname(host, certificate)
}
}
/** Returns true if [certificate] matches [ipAddress]. */
private fun verifyIpAddress(ipAddress: String, certificate: X509Certificate): Boolean {
val canonicalIpAddress = ipAddress.toCanonicalHost()
return getSubjectAltNames(certificate, ALT_IPA_NAME).any {
canonicalIpAddress == it.toCanonicalHost()
}
}
/** Returns true if [certificate] matches [hostname]. */
private fun verifyHostname(hostname: String, certificate: X509Certificate): Boolean {
val hostname = hostname.asciiToLowercase()
return getSubjectAltNames(certificate, ALT_DNS_NAME).any {
verifyHostname(hostname, it)
}
}
/**
* This is like [toLowerCase] except that it does nothing if this contains any non-ASCII
* characters. We want to avoid lower casing special chars like U+212A (Kelvin symbol) because
* they can return ASCII characters that match real hostnames.
*/
private fun String.asciiToLowercase(): String {
return when {
isAscii() -> lowercase(Locale.US) // This is an ASCII string.
else -> this
}
}
/** Returns true if the [String] is ASCII encoded (0-127). */
private fun String.isAscii() = length == utf8Size().toInt()
/**
* Returns true if [hostname] matches the domain name [pattern].
*
* @param hostname lower-case host name.
* @param pattern domain name pattern from certificate. May be a wildcard pattern such as
* `*.android.com`.
*/
private fun verifyHostname(hostname: String?, pattern: String?): Boolean {
var hostname = hostname
var pattern = pattern
// Basic sanity checks
if (hostname.isNullOrEmpty() ||
hostname.startsWith(".") ||
hostname.endsWith("..")) {
// Invalid domain name
return false
}
if (pattern.isNullOrEmpty() ||
pattern.startsWith(".") ||
pattern.endsWith("..")) {
// Invalid pattern/domain name
return false
}
// Normalize hostname and pattern by turning them into absolute domain names if they are not
// yet absolute. This is needed because server certificates do not normally contain absolute
// names or patterns, but they should be treated as absolute. At the same time, any hostname
// presented to this method should also be treated as absolute for the purposes of matching
// to the server certificate.
// www.android.com matches www.android.com
// www.android.com matches www.android.com.
// www.android.com. matches www.android.com.
// www.android.com. matches www.android.com
if (!hostname.endsWith(".")) {
hostname += "."
}
if (!pattern.endsWith(".")) {
pattern += "."
}
// Hostname and pattern are now absolute domain names.
pattern = pattern.asciiToLowercase()
// Hostname and pattern are now in lower case -- domain names are case-insensitive.
if ("*" !in pattern) {
// Not a wildcard pattern -- hostname and pattern must match exactly.
return hostname == pattern
}
// Wildcard pattern
// WILDCARD PATTERN RULES:
// 1. Asterisk (*) is only permitted in the left-most domain name label and must be the
// only character in that label (i.e., must match the whole left-most label).
// For example, *.example.com is permitted, while *a.example.com, a*.example.com,
// a*b.example.com, a.*.example.com are not permitted.
// 2. Asterisk (*) cannot match across domain name labels.
// For example, *.example.com matches test.example.com but does not match
// sub.test.example.com.
// 3. Wildcard patterns for single-label domain names are not permitted.
if (!pattern.startsWith("*.") || pattern.indexOf('*', 1) != -1) {
// Asterisk (*) is only permitted in the left-most domain name label and must be the only
// character in that label
return false
}
// Optimization: check whether hostname is too short to match the pattern. hostName must be at
// least as long as the pattern because asterisk must match the whole left-most label and
// hostname starts with a non-empty label. Thus, asterisk has to match one or more characters.
if (hostname.length < pattern.length) {
return false // Hostname too short to match the pattern.
}
if ("*." == pattern) {
return false // Wildcard pattern for single-label domain name -- not permitted.
}
// Hostname must end with the region of pattern following the asterisk.
val suffix = pattern.substring(1)
if (!hostname.endsWith(suffix)) {
return false // Hostname does not end with the suffix.
}
// Check that asterisk did not match across domain name labels.
val suffixStartIndexInHostname = hostname.length - suffix.length
if (suffixStartIndexInHostname > 0 &&
hostname.lastIndexOf('.', suffixStartIndexInHostname - 1) != -1) {
return false // Asterisk is matching across domain name labels -- not permitted.
}
// Hostname matches pattern.
return true
}
fun allSubjectAltNames(certificate: X509Certificate): List {
val altIpaNames = getSubjectAltNames(certificate, ALT_IPA_NAME)
val altDnsNames = getSubjectAltNames(certificate, ALT_DNS_NAME)
return altIpaNames + altDnsNames
}
private fun getSubjectAltNames(certificate: X509Certificate, type: Int): List {
try {
val subjectAltNames = certificate.subjectAlternativeNames ?: return emptyList()
val result = mutableListOf()
for (subjectAltName in subjectAltNames) {
if (subjectAltName == null || subjectAltName.size < 2) continue
if (subjectAltName[0] != type) continue
val altName = subjectAltName[1] ?: continue
result.add(altName as String)
}
return result
} catch (_: CertificateParsingException) {
return emptyList()
}
}
}
