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/*
* Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.security.ssl;
import java.math.BigInteger;
import java.util.*;
import java.util.regex.Pattern;
import javax.net.ssl.*;
import sun.net.util.IPAddressUtil;
import sun.security.action.GetPropertyAction;
/**
* A utility class to share the static methods.
*/
final class Utilities {
private static final String indent = " ";
private static final Pattern lineBreakPatern =
Pattern.compile("\\r\\n|\\n|\\r");
private static final HexFormat HEX_FORMATTER =
HexFormat.of().withUpperCase();
/**
* Puts {@code hostname} into the {@code serverNames} list.
*
* If the {@code serverNames} does not look like a legal FQDN, it will
* not be put into the returned list.
*
* Note that the returned list does not allow duplicated name type.
*
* @return a list of {@link SNIServerName}
*/
static List addToSNIServerNameList(
List serverNames, String hostname) {
SNIHostName sniHostName = rawToSNIHostName(hostname);
if (sniHostName == null) {
return serverNames;
}
int size = serverNames.size();
List sniList = (size != 0) ?
new ArrayList<>(serverNames) :
new ArrayList<>(1);
boolean reset = false;
for (int i = 0; i < size; i++) {
SNIServerName serverName = sniList.get(i);
if (serverName.getType() == StandardConstants.SNI_HOST_NAME) {
sniList.set(i, sniHostName);
if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
SSLLogger.fine(
"the previous server name in SNI (" + serverName +
") was replaced with (" + sniHostName + ")");
}
reset = true;
break;
}
}
if (!reset) {
sniList.add(sniHostName);
}
return Collections.unmodifiableList(sniList);
}
/**
* Converts string hostname to {@code SNIHostName}.
*
* Note that to check whether a hostname is a valid domain name, we cannot
* use the hostname resolved from name services. For virtual hosting,
* multiple hostnames may be bound to the same IP address, so the hostname
* resolved from name services is not always reliable.
*
* @param hostname
* the raw hostname
* @return an instance of {@link SNIHostName}, or null if the hostname does
* not look like a FQDN
*/
private static SNIHostName rawToSNIHostName(String hostname) {
SNIHostName sniHostName = null;
if (hostname != null && hostname.indexOf('.') > 0 &&
!hostname.endsWith(".") &&
!IPAddressUtil.isIPv4LiteralAddress(hostname) &&
!IPAddressUtil.isIPv6LiteralAddress(hostname)) {
try {
sniHostName = new SNIHostName(hostname);
} catch (IllegalArgumentException iae) {
// don't bother to handle illegal host_name
if (SSLLogger.isOn && SSLLogger.isOn("ssl")) {
SSLLogger.fine(hostname + "\" " +
"is not a legal HostName for server name indication");
}
}
}
return sniHostName;
}
/**
* Return the value of the boolean System property propName.
*
* Note use of privileged action. Do NOT make accessible to applications.
*/
static boolean getBooleanProperty(String propName, boolean defaultValue) {
// if set, require value of either true or false
String b = GetPropertyAction.privilegedGetProperty(propName);
if (b == null) {
return defaultValue;
} else if (b.equalsIgnoreCase("false")) {
return false;
} else if (b.equalsIgnoreCase("true")) {
return true;
} else {
throw new RuntimeException("Value of " + propName
+ " must either be 'true' or 'false'");
}
}
static String indent(String source) {
return Utilities.indent(source, indent);
}
static String indent(String source, String prefix) {
StringBuilder builder = new StringBuilder();
if (source == null) {
builder.append("\n").append(prefix).append("");
} else {
String[] lines = lineBreakPatern.split(source);
boolean isFirst = true;
for (String line : lines) {
if (isFirst) {
isFirst = false;
} else {
builder.append("\n");
}
builder.append(prefix).append(line);
}
}
return builder.toString();
}
static String byte16HexString(int id) {
return "0x" + HEX_FORMATTER.toHexDigits((short)id);
}
static String toHexString(byte[] bytes) {
if (bytes == null || bytes.length == 0) {
return "";
}
return HEX_FORMATTER.formatHex(bytes);
}
static String toHexString(long lv) {
StringBuilder builder = new StringBuilder(128);
boolean isFirst = true;
do {
if (isFirst) {
isFirst = false;
} else {
builder.append(' ');
}
HEX_FORMATTER.toHexDigits(builder, (byte)lv);
lv >>>= 8;
} while (lv != 0);
builder.reverse();
return builder.toString();
}
/**
* Utility method to convert a BigInteger to a byte array in unsigned
* format as needed in the handshake messages. BigInteger uses
* 2's complement format, i.e. it prepends an extra zero if the MSB
* is set. We remove that.
*/
static byte[] toByteArray(BigInteger bi) {
byte[] b = bi.toByteArray();
if ((b.length > 1) && (b[0] == 0)) {
int n = b.length - 1;
byte[] newarray = new byte[n];
System.arraycopy(b, 1, newarray, 0, n);
b = newarray;
}
return b;
}
static void reverseBytes(byte[] arr) {
int i = 0;
int j = arr.length - 1;
while (i < j) {
swap(arr, i, j);
i++;
j--;
}
}
private static void swap(byte[] arr, int i, int j) {
byte tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
}