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/*
* JBoss, Home of Professional Open Source.
* Copyright 2015 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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 org.wildfly.security.pem;
import static org.wildfly.security.x500.cert._private.ElytronMessages.log;
import java.io.IOException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.function.BiFunction;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.sshd.common.config.keys.FilePasswordProvider;
import org.apache.sshd.common.config.keys.loader.openssh.OpenSSHKeyPairResourceParser;
import org.wildfly.common.Assert;
import org.wildfly.common.bytes.ByteStringBuilder;
import org.wildfly.common.iteration.ByteIterator;
import org.wildfly.common.iteration.CodePointIterator;
import org.wildfly.security.asn1.ASN1;
import org.wildfly.security.asn1.DERDecoder;
import org.wildfly.security.x500.cert.PKCS10CertificateSigningRequest;
/**
* A class containing utilities which can handle the PEM format. See RFC 7468
* for more information.
*
* @author David M. Lloyd
*/
public final class Pem {
private static final Pattern VALID_LABEL = Pattern.compile("[^ -~&&[^-]]");
private static final String PUBLIC_KEY_FORMAT = "PUBLIC KEY";
private static final String CERTIFICATE_FORMAT = "CERTIFICATE";
private static final String PRIVATE_KEY_FORMAT = "PRIVATE KEY";
private static final String RSA_PRIVATE_KEY_FORMAT = "RSA PRIVATE KEY";
private static final String CERTIFICATE_REQUEST_FORMAT = "CERTIFICATE REQUEST";
public static final String OPENSSH_PRIVATE_KEY_FORMAT = "OPENSSH PRIVATE KEY";
/**
* Parse arbitrary PEM content. The given function is used to parse the content of the PEM representation and produce
* some result. The PEM type string is passed to the function. If the function throws an exception, that exception
* is propagated to the caller of this method. If the PEM content is malformed, an exception is thrown. If the
* trailing PEM content is found to be invalid after the function returns, the function result is discarded and an
* exception is thrown.
*
* @param pemContent the content to parse (must not be {@code null})
* @param contentFunction a function to consume the PEM content and produce a result (must not be {@code null})
* @param the value return type
* @return the return value of the function or {@code null} if there is no PEM content to parse
* @throws IllegalArgumentException if there is a problem with processing the content of the PEM data
*/
public static R parsePemContent(CodePointIterator pemContent, BiFunction contentFunction) throws IllegalArgumentException {
Assert.checkNotNullParam("pemContent", pemContent);
Assert.checkNotNullParam("contentFunction", contentFunction);
long matchIdx = -1;
while (pemContent.hasNext()) {
int cp = pemContent.next();
if (cp == '-') {
long idx = pemContent.getIndex();
if (pemContent.limitedTo(10).contentEquals("----BEGIN ")) {
String type = pemContent.delimitedBy('-').drainToString();
final Matcher matcher = VALID_LABEL.matcher(type);
if (!matcher.find() && pemContent.limitedTo(5).contentEquals("-----")) {
matchIdx = idx;
break;
} else {
while (pemContent.getIndex() > idx) pemContent.previous();
}
} else {
while (pemContent.getIndex() > idx) pemContent.previous();
}
}
}
if (matchIdx == -1) return null;
while (pemContent.getIndex() > matchIdx) pemContent.previous();
if (! pemContent.limitedTo(10).contentEquals("----BEGIN ")) {
throw log.malformedPemContent(pemContent.getIndex());
}
String type = pemContent.delimitedBy('-').drainToString();
final Matcher matcher = VALID_LABEL.matcher(type);
if (matcher.find()) {
// BEGIN string is 11 chars long
throw log.malformedPemContent(matcher.start() + 11);
}
if (! pemContent.limitedTo(5).contentEquals("-----")) {
throw log.malformedPemContent(pemContent.getIndex());
}
CodePointIterator delimitedIterator = pemContent.delimitedBy('-').skip(Character::isWhitespace).skipCrLf();
final ByteIterator byteIterator = delimitedIterator.base64Decode();
final R result = contentFunction.apply(type, byteIterator);
delimitedIterator.skipAll(); // skip until '-'
if (! pemContent.limitedTo(9).contentEquals("-----END ")) {
throw log.malformedPemContent(pemContent.getIndex());
}
if (! pemContent.limitedTo(type.length()).contentEquals(type)) {
throw log.malformedPemContent(pemContent.getIndex());
}
if (! pemContent.limitedTo(5).contentEquals("-----")) {
throw log.malformedPemContent(pemContent.getIndex());
}
return result;
}
/**
* Iterate over the contents of a PEM file, returning each entry in sequence.
*
* @param pemContent the code point iterator over the content (must not be {@code null})
* @return the iterator (not {@code null})
*/
public static Iterator> parsePemContent(CodePointIterator pemContent) {
return new Iterator>() {
private PemEntry next;
public boolean hasNext() {
if (next == null) {
if (! pemContent.hasNext()) {
return false;
}
next = parsePemContent(pemContent, (type, byteIterator) -> {
switch (type) {
case CERTIFICATE_FORMAT: {
final X509Certificate x509Certificate = parsePemX509CertificateContent(type, byteIterator);
return new PemEntry<>(x509Certificate);
}
case PUBLIC_KEY_FORMAT: {
final PublicKey publicKey = parsePemPublicKey(type, byteIterator);
return new PemEntry<>(publicKey);
}
case PRIVATE_KEY_FORMAT: {
final PrivateKey privateKey = parsePemPrivateKey(type, byteIterator);
return new PemEntry<>(privateKey);
}
case RSA_PRIVATE_KEY_FORMAT: {
final PrivateKey privateKey = parsePemRsaPrivateKey(type, byteIterator);
return new PemEntry<>(privateKey);
}
default: {
throw log.malformedPemContent(pemContent.getIndex());
}
}
});
if (next == null) {
return false;
}
}
return true;
}
public PemEntry next() {
if (! hasNext()) {
throw new NoSuchElementException();
}
try {
return next;
} finally {
next = null;
}
}
};
}
/**
* Iterate over the contents of a key file in OpenSSH format, returning each entry in sequence.
*
* @param pemContent the code point iterator over the content (must not be {@code null})
* @param passphraseProvider provides the passphrase used to decrypt the private key(may be {@code null})
* @return the iterator (not {@code null})
* @throws IllegalArgumentException if there is a problem with the data or the key
*/
public static Iterator> parsePemOpenSSHContent(CodePointIterator pemContent, FilePasswordProvider passphraseProvider) throws IllegalArgumentException {
return new Iterator>() {
private PemEntry next;
public boolean hasNext() {
if (next == null) {
if (! pemContent.hasNext()) {
return false;
}
next = parsePemContent(pemContent, (type, byteIterator) -> {
switch (type) {
case OPENSSH_PRIVATE_KEY_FORMAT: {
final KeyPair keyPair = parseOpenSSHKeys(byteIterator, passphraseProvider);
return new PemEntry<>(keyPair);
}
default: {
throw log.malformedPemContent(pemContent.getIndex());
}
}
});
if (next == null) {
return false;
}
}
return true;
}
public PemEntry next() {
if (! hasNext()) {
throw new NoSuchElementException();
}
try {
return next;
} finally {
next = null;
}
}
};
}
/**
* Generate PEM content to the given byte string builder. The appropriate header and footer surrounds the base-64
* encoded value.
*
* @param target the target byte string builder (must not be {@code null})
* @param type the content type (must not be {@code null})
* @param content the content iterator (must not be {@code null})
* @throws IllegalArgumentException if there is a problem with the data or the type
*/
public static void generatePemContent(ByteStringBuilder target, String type, ByteIterator content) throws IllegalArgumentException {
Assert.checkNotNullParam("target", target);
Assert.checkNotNullParam("type", type);
Assert.checkNotNullParam("content", content);
final Matcher matcher = VALID_LABEL.matcher(type);
if (matcher.find()) {
throw log.invalidPemType("", type);
}
target.append("-----BEGIN ").append(type).append("-----");
target.append(content.base64Encode().drainToString(System.lineSeparator(), 64)); // insert the line separator before every 64 code points
target.append(System.lineSeparator()).append("-----END ").append(type).append("-----").append(System.lineSeparator());
}
/**
* Extracts the DER content from the given pemContent.
*
* @param pemContent a {@link CodePointIterator} with the PEM content
* @return a byte array with the DER content
*/
public static byte[] extractDerContent(CodePointIterator pemContent) {
return parsePemContent(pemContent, (type, byteIterator) -> byteIterator.drain());
}
private static X509Certificate parsePemX509CertificateContent(String type, ByteIterator byteIterator) throws IllegalArgumentException {
if (! type.equals(CERTIFICATE_FORMAT)) {
throw log.invalidPemType(CERTIFICATE_FORMAT, type);
}
try {
final CertificateFactory instance = CertificateFactory.getInstance("X.509");
return (X509Certificate) instance.generateCertificate(byteIterator.asInputStream());
} catch (CertificateException e) {
throw log.certificateParseError(e);
}
}
private static PublicKey parsePemPublicKey(String type, ByteIterator byteIterator) throws IllegalArgumentException {
if (! type.equals(PUBLIC_KEY_FORMAT)) {
throw log.invalidPemType(PUBLIC_KEY_FORMAT, type);
}
try {
byte[] der = byteIterator.drain();
DERDecoder derDecoder = new DERDecoder(der);
derDecoder.startSequence();
switch (derDecoder.peekType()) {
case ASN1.SEQUENCE_TYPE:
derDecoder.startSequence();
String algorithm = derDecoder.decodeObjectIdentifierAsKeyAlgorithm();
if (algorithm != null) {
return KeyFactory.getInstance(algorithm).generatePublic(new X509EncodedKeySpec(der));
}
throw log.asnUnrecognisedAlgorithm(algorithm);
default:
throw log.asnUnexpectedTag();
}
} catch (Exception cause) {
throw log.publicKeyParseError(cause);
}
}
private static PrivateKey parsePemPrivateKey(String type, ByteIterator byteIterator) throws IllegalArgumentException {
if (! type.equals(PRIVATE_KEY_FORMAT)) {
throw log.invalidPemType(PRIVATE_KEY_FORMAT, type);
}
try {
byte[] der = byteIterator.drain();
DERDecoder derDecoder = new DERDecoder(der);
derDecoder.startSequence();
// Version
if (derDecoder.peekType() != ASN1.INTEGER_TYPE) throw log.asnUnexpectedTag();
derDecoder.skipElement();
// AlgorithmIdentifier
derDecoder.startSequence();
String algorithm = derDecoder.decodeObjectIdentifierAsKeyAlgorithm();
if (algorithm != null) {
return KeyFactory.getInstance(algorithm).generatePrivate(new PKCS8EncodedKeySpec(der));
}
throw log.asnUnrecognisedAlgorithm(algorithm);
} catch (Exception cause) {
throw log.privateKeyParseError(cause);
}
}
private static PrivateKey parsePemRsaPrivateKey(String type, ByteIterator byteIterator) throws IllegalArgumentException {
if (! type.equals(RSA_PRIVATE_KEY_FORMAT)) {
throw log.invalidPemType(RSA_PRIVATE_KEY_FORMAT, type);
}
try {
byte[] der = byteIterator.drain();
DERDecoder derDecoder = new DERDecoder(der);
derDecoder.startSequence();
// Version
if (derDecoder.peekType() != ASN1.INTEGER_TYPE) throw log.asnUnexpectedTag();
derDecoder.skipElement();
BigInteger modulus = derDecoder.decodeInteger();
BigInteger publicExp = derDecoder.decodeInteger();
BigInteger privateExp = derDecoder.decodeInteger();
BigInteger prime1 = derDecoder.decodeInteger();
BigInteger prime2 = derDecoder.decodeInteger();
BigInteger exp1 = derDecoder.decodeInteger();
BigInteger exp2 = derDecoder.decodeInteger();
BigInteger crtCoef = derDecoder.decodeInteger();
RSAPrivateCrtKeySpec keySpec = new RSAPrivateCrtKeySpec(
modulus, publicExp, privateExp, prime1, prime2,
exp1, exp2, crtCoef);
return KeyFactory.getInstance("RSA").generatePrivate(keySpec);
} catch (Exception cause) {
throw log.privateKeyParseError(cause);
}
}
private static KeyPair parseOpenSSHKeys(ByteIterator byteIterator, FilePasswordProvider passphraseProvider) throws IllegalArgumentException {
OpenSSHKeyPairResourceParser resourceParser = new OpenSSHKeyPairResourceParser();
byte[] stream = byteIterator.drain();
try {
return resourceParser.extractKeyPairs(null, null,
OpenSSHKeyPairResourceParser.BEGIN_MARKER, OpenSSHKeyPairResourceParser.END_MARKER,
passphraseProvider, stream, null).iterator().next();
} catch (IOException e) {
throw log.openSshParseError(e.getMessage());
} catch (GeneralSecurityException e) {
throw log.openSshGeneratingError(e.getMessage());
}
}
/**
* Parse an X.509 certificate in PEM format.
*
* @param pemContent the PEM content (must not be {@code null})
* @return the certificate (not {@code null})
* @throws IllegalArgumentException if the certificate could not be parsed for some reason
*/
public static X509Certificate parsePemX509Certificate(CodePointIterator pemContent) throws IllegalArgumentException {
Assert.checkNotNullParam("pemContent", pemContent);
return parsePemContent(pemContent, Pem::parsePemX509CertificateContent);
}
/**
* Parse a {@link PublicKey} in PEM format.
*
* @param pemContent the PEM content (must not be {@code null})
* @return the public key (not {@code null})
* @throws IllegalArgumentException if the public key could not be parsed for some reason
*/
public static PublicKey parsePemPublicKey(CodePointIterator pemContent) throws IllegalArgumentException {
Assert.checkNotNullParam("pemContent", pemContent);
return parsePemContent(pemContent, Pem::parsePemPublicKey);
}
/**
* Generate PEM content containing an X.509 certificate.
*
* @param target the target byte string builder (must not be {@code null})
* @param certificate the X.509 certificate (must not be {@code null})
*/
public static void generatePemX509Certificate(ByteStringBuilder target, X509Certificate certificate) {
Assert.checkNotNullParam("target", target);
Assert.checkNotNullParam("certificate", certificate);
try {
generatePemContent(target, CERTIFICATE_FORMAT, ByteIterator.ofBytes(certificate.getEncoded()));
} catch (CertificateEncodingException e) {
throw log.certificateParseError(e);
}
}
/**
* Generate PEM content containing a {@link PublicKey}.
*
* @param target the target byte string builder (must not be {@code null})
* @param publicKey the {@link PublicKey} (must not be {@code null})
*/
public static void generatePemPublicKey(ByteStringBuilder target, PublicKey publicKey) {
Assert.checkNotNullParam("target", target);
Assert.checkNotNullParam("publicKey", publicKey);
try {
KeyFactory instance = KeyFactory.getInstance(publicKey.getAlgorithm());
X509EncodedKeySpec keySpec = instance.getKeySpec(publicKey, X509EncodedKeySpec.class);
generatePemContent(target, PUBLIC_KEY_FORMAT, ByteIterator.ofBytes(keySpec.getEncoded()));
} catch (Exception e) {
throw log.publicKeyParseError(e);
}
}
/**
* Generate PEM content containing a PKCS #10 certificate signing request.
*
* @param target the target byte string builder (must not be {@code null})
* @param certificateSigningRequest the PKCS #10 certificate signing request (must not be {@code null})
* @since 1.2.0
*/
public static void generatePemPKCS10CertificateSigningRequest(ByteStringBuilder target, PKCS10CertificateSigningRequest certificateSigningRequest) {
Assert.checkNotNullParam("target", target);
Assert.checkNotNullParam("certificateSigningRequest", certificateSigningRequest);
generatePemContent(target, CERTIFICATE_REQUEST_FORMAT, ByteIterator.ofBytes(certificateSigningRequest.getEncoded()));
}
}
