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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.conscrypt;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.security.cert.CertPath;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.conscrypt.OpenSSLX509CertificateFactory.ParsingException;
/**
* An implementation of {@link CertPath} based on BoringSSL.
*/
final class OpenSSLX509CertPath extends CertPath {
private static final long serialVersionUID = -3249106005255170761L;
private static final byte[] PKCS7_MARKER = new byte[] {
'-', '-', '-', '-', '-', 'B', 'E', 'G', 'I', 'N', ' ', 'P', 'K', 'C', 'S', '7'
};
private static final int PUSHBACK_SIZE = 64;
/**
* Supported encoding types for CerthPath. Used by the various APIs that
* encode this into bytes such as {@link #getEncoded()}.
*/
private enum Encoding {
PKI_PATH("PkiPath"),
PKCS7("PKCS7");
private final String apiName;
Encoding(String apiName) {
this.apiName = apiName;
}
static Encoding findByApiName(String apiName) throws CertificateEncodingException {
for (Encoding element : values()) {
if (element.apiName.equals(apiName)) {
return element;
}
}
return null;
}
}
/** Unmodifiable list of encodings for the API. */
private static final List ALL_ENCODINGS = Collections.unmodifiableList(Arrays
.asList(new String[] {
Encoding.PKI_PATH.apiName,
Encoding.PKCS7.apiName,
}));
private static final Encoding DEFAULT_ENCODING = Encoding.PKI_PATH;
private final List mCertificates;
static Iterator getEncodingsIterator() {
return ALL_ENCODINGS.iterator();
}
OpenSSLX509CertPath(List certificates) {
super("X.509");
mCertificates = certificates;
}
@Override
public List getCertificates() {
return Collections.unmodifiableList(mCertificates);
}
private byte[] getEncoded(Encoding encoding) throws CertificateEncodingException {
final OpenSSLX509Certificate[] certs = new OpenSSLX509Certificate[mCertificates.size()];
final long[] certRefs = new long[certs.length];
for (int i = 0, j = certs.length - 1; j >= 0; i++, j--) {
final X509Certificate cert = mCertificates.get(i);
if (cert instanceof OpenSSLX509Certificate) {
certs[j] = (OpenSSLX509Certificate) cert;
} else {
certs[j] = OpenSSLX509Certificate.fromX509Der(cert.getEncoded());
}
certRefs[j] = certs[j].getContext();
}
switch (encoding) {
case PKI_PATH:
return NativeCrypto.ASN1_seq_pack_X509(certRefs);
case PKCS7:
return NativeCrypto.i2d_PKCS7(certRefs);
default:
throw new CertificateEncodingException("Unknown encoding");
}
}
@Override
public byte[] getEncoded() throws CertificateEncodingException {
return getEncoded(DEFAULT_ENCODING);
}
@Override
public byte[] getEncoded(String encoding) throws CertificateEncodingException {
Encoding enc = Encoding.findByApiName(encoding);
if (enc == null) {
throw new CertificateEncodingException("Invalid encoding: " + encoding);
}
return getEncoded(enc);
}
@Override
public Iterator getEncodings() {
return getEncodingsIterator();
}
private static CertPath fromPkiPathEncoding(InputStream inStream) throws CertificateException {
OpenSSLBIOInputStream bis = new OpenSSLBIOInputStream(inStream, true);
final boolean markable = inStream.markSupported();
if (markable) {
inStream.mark(PUSHBACK_SIZE);
}
final long[] certRefs;
try {
certRefs = NativeCrypto.ASN1_seq_unpack_X509_bio(bis.getBioContext());
} catch (Exception e) {
if (markable) {
try {
inStream.reset();
} catch (IOException ignored) {
}
}
throw new CertificateException(e);
} finally {
bis.release();
}
if (certRefs == null) {
return new OpenSSLX509CertPath(Collections. emptyList());
}
final List certs =
new ArrayList(certRefs.length);
for (int i = certRefs.length - 1; i >= 0; i--) {
if (certRefs[i] == 0) {
continue;
}
try {
certs.add(new OpenSSLX509Certificate(certRefs[i]));
} catch (ParsingException e) {
throw new CertificateParsingException(e);
}
}
return new OpenSSLX509CertPath(certs);
}
private static CertPath fromPkcs7Encoding(InputStream inStream) throws CertificateException {
try {
if (inStream == null || inStream.available() == 0) {
return new OpenSSLX509CertPath(Collections. emptyList());
}
} catch (IOException e) {
throw new CertificateException("Problem reading input stream", e);
}
final boolean markable = inStream.markSupported();
if (markable) {
inStream.mark(PUSHBACK_SIZE);
}
/* Attempt to see if this is a PKCS#7 bag. */
final PushbackInputStream pbis = new PushbackInputStream(inStream, PUSHBACK_SIZE);
try {
final byte[] buffer = new byte[PKCS7_MARKER.length];
final int len = pbis.read(buffer);
if (len < 0) {
/* No need to reset here. The stream was empty or EOF. */
throw new ParsingException("inStream is empty");
}
pbis.unread(buffer, 0, len);
if (len == PKCS7_MARKER.length && Arrays.equals(PKCS7_MARKER, buffer)) {
return new OpenSSLX509CertPath(OpenSSLX509Certificate.fromPkcs7PemInputStream(pbis));
}
return new OpenSSLX509CertPath(OpenSSLX509Certificate.fromPkcs7DerInputStream(pbis));
} catch (Exception e) {
if (markable) {
try {
inStream.reset();
} catch (IOException ignored) {
}
}
throw new CertificateException(e);
}
}
private static CertPath fromEncoding(InputStream inStream, Encoding encoding)
throws CertificateException {
switch (encoding) {
case PKI_PATH:
return fromPkiPathEncoding(inStream);
case PKCS7:
return fromPkcs7Encoding(inStream);
default:
throw new CertificateEncodingException("Unknown encoding");
}
}
static CertPath fromEncoding(InputStream inStream, String encoding)
throws CertificateException {
if (inStream == null) {
throw new CertificateException("inStream == null");
}
Encoding enc = Encoding.findByApiName(encoding);
if (enc == null) {
throw new CertificateException("Invalid encoding: " + encoding);
}
return fromEncoding(inStream, enc);
}
static CertPath fromEncoding(InputStream inStream) throws CertificateException {
if (inStream == null) {
throw new CertificateException("inStream == null");
}
return fromEncoding(inStream, DEFAULT_ENCODING);
}
}
