2 * Copyright (c) 2016 Brocade Communication Systems and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.netconf.callhome.mount;
10 import java.io.ByteArrayOutputStream;
11 import java.io.DataOutputStream;
12 import java.io.IOException;
13 import java.math.BigInteger;
14 import java.nio.charset.StandardCharsets;
15 import java.security.GeneralSecurityException;
16 import java.security.KeyFactory;
17 import java.security.PublicKey;
18 import java.security.interfaces.DSAParams;
19 import java.security.interfaces.DSAPublicKey;
20 import java.security.interfaces.RSAPublicKey;
21 import java.security.spec.DSAPublicKeySpec;
22 import java.security.spec.ECPoint;
23 import java.security.spec.ECPublicKeySpec;
24 import java.security.spec.RSAPublicKeySpec;
25 import java.util.Arrays;
26 import java.util.Base64;
27 import java.util.HashMap;
29 import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
30 import org.bouncycastle.jce.ECNamedCurveTable;
31 import org.bouncycastle.jce.ECPointUtil;
32 import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
33 import org.bouncycastle.jce.spec.ECNamedCurveSpec;
34 import org.opendaylight.netconf.shaded.sshd.common.util.security.SecurityUtils;
37 * FIXME: This should be probably located at AAA library.
39 public class AuthorizedKeysDecoder {
41 private static final String KEY_FACTORY_TYPE_RSA = "RSA";
42 private static final String KEY_FACTORY_TYPE_DSA = "DSA";
43 private static final String KEY_FACTORY_TYPE_ECDSA = "EC";
45 private static final Map<String, String> ECDSA_CURVES = new HashMap<>();
48 ECDSA_CURVES.put("nistp256", "secp256r1");
49 ECDSA_CURVES.put("nistp384", "secp384r1");
50 ECDSA_CURVES.put("nistp512", "secp512r1");
53 private static final String ECDSA_SUPPORTED_CURVE_NAME = "nistp256";
54 private static final String ECDSA_SUPPORTED_CURVE_NAME_SPEC = ECDSA_CURVES.get(ECDSA_SUPPORTED_CURVE_NAME);
56 private static final String KEY_TYPE_RSA = "ssh-rsa";
57 private static final String KEY_TYPE_DSA = "ssh-dss";
58 private static final String KEY_TYPE_ECDSA = "ecdsa-sha2-" + ECDSA_SUPPORTED_CURVE_NAME;
60 private byte[] bytes = new byte[0];
63 public PublicKey decodePublicKey(final String keyLine) throws GeneralSecurityException {
65 // look for the Base64 encoded part of the line to decode
66 // both ssh-rsa and ssh-dss begin with "AAAA" due to the length bytes
67 bytes = Base64.getDecoder().decode(keyLine.getBytes(StandardCharsets.UTF_8));
68 if (bytes.length == 0) {
69 throw new IllegalArgumentException("No Base64 part to decode in " + keyLine);
74 String type = decodeType();
75 if (type.equals(KEY_TYPE_RSA)) {
79 if (type.equals(KEY_TYPE_DSA)) {
83 if (type.equals(KEY_TYPE_ECDSA)) {
84 return decodeAsEcDSA();
87 throw new IllegalArgumentException("Unknown decode key type " + type + " in " + keyLine);
90 private PublicKey decodeAsEcDSA() throws GeneralSecurityException {
91 KeyFactory ecdsaFactory = SecurityUtils.getKeyFactory(KEY_FACTORY_TYPE_ECDSA);
93 ECNamedCurveParameterSpec spec256r1 = ECNamedCurveTable.getParameterSpec(ECDSA_SUPPORTED_CURVE_NAME_SPEC);
94 ECNamedCurveSpec params256r1 = new ECNamedCurveSpec(
95 ECDSA_SUPPORTED_CURVE_NAME_SPEC, spec256r1.getCurve(), spec256r1.getG(), spec256r1.getN());
96 // copy last 65 bytes from ssh key.
97 ECPoint point = ECPointUtil.decodePoint(params256r1.getCurve(), Arrays.copyOfRange(bytes, 39, bytes.length));
98 ECPublicKeySpec pubKeySpec = new ECPublicKeySpec(point, params256r1);
100 return ecdsaFactory.generatePublic(pubKeySpec);
103 private PublicKey decodeAsDSA() throws GeneralSecurityException {
104 KeyFactory dsaFactory = SecurityUtils.getKeyFactory(KEY_FACTORY_TYPE_DSA);
105 BigInteger prime = decodeBigInt();
106 BigInteger subPrime = decodeBigInt();
107 BigInteger base = decodeBigInt();
108 BigInteger publicKey = decodeBigInt();
109 DSAPublicKeySpec spec = new DSAPublicKeySpec(publicKey, prime, subPrime, base);
111 return dsaFactory.generatePublic(spec);
114 private PublicKey decodeAsRSA() throws GeneralSecurityException {
115 KeyFactory rsaFactory = SecurityUtils.getKeyFactory(KEY_FACTORY_TYPE_RSA);
116 BigInteger exponent = decodeBigInt();
117 BigInteger modulus = decodeBigInt();
118 RSAPublicKeySpec spec = new RSAPublicKeySpec(modulus, exponent);
120 return rsaFactory.generatePublic(spec);
123 private String decodeType() {
124 int len = decodeInt();
125 String type = new String(bytes, pos, len, StandardCharsets.UTF_8);
130 private int decodeInt() {
131 return (bytes[pos++] & 0xFF) << 24 | (bytes[pos++] & 0xFF) << 16
132 | (bytes[pos++] & 0xFF) << 8 | bytes[pos++] & 0xFF;
135 private BigInteger decodeBigInt() {
136 int len = decodeInt();
137 byte[] bigIntBytes = new byte[len];
138 System.arraycopy(bytes, pos, bigIntBytes, 0, len);
140 return new BigInteger(bigIntBytes);
143 public static String encodePublicKey(final PublicKey publicKey) throws IOException {
144 ByteArrayOutputStream byteOs = new ByteArrayOutputStream();
145 if (publicKey.getAlgorithm().equals(KEY_FACTORY_TYPE_RSA) && publicKey instanceof RSAPublicKey) {
146 RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
147 DataOutputStream dout = new DataOutputStream(byteOs);
148 dout.writeInt(KEY_TYPE_RSA.getBytes(StandardCharsets.UTF_8).length);
149 dout.write(KEY_TYPE_RSA.getBytes(StandardCharsets.UTF_8));
150 dout.writeInt(rsaPublicKey.getPublicExponent().toByteArray().length);
151 dout.write(rsaPublicKey.getPublicExponent().toByteArray());
152 dout.writeInt(rsaPublicKey.getModulus().toByteArray().length);
153 dout.write(rsaPublicKey.getModulus().toByteArray());
154 } else if (publicKey.getAlgorithm().equals(KEY_FACTORY_TYPE_DSA) && publicKey instanceof DSAPublicKey) {
155 DSAPublicKey dsaPublicKey = (DSAPublicKey) publicKey;
156 DSAParams dsaParams = dsaPublicKey.getParams();
157 DataOutputStream dout = new DataOutputStream(byteOs);
158 dout.writeInt(KEY_TYPE_DSA.getBytes(StandardCharsets.UTF_8).length);
159 dout.write(KEY_TYPE_DSA.getBytes(StandardCharsets.UTF_8));
160 dout.writeInt(dsaParams.getP().toByteArray().length);
161 dout.write(dsaParams.getP().toByteArray());
162 dout.writeInt(dsaParams.getQ().toByteArray().length);
163 dout.write(dsaParams.getQ().toByteArray());
164 dout.writeInt(dsaParams.getG().toByteArray().length);
165 dout.write(dsaParams.getG().toByteArray());
166 dout.writeInt(dsaPublicKey.getY().toByteArray().length);
167 dout.write(dsaPublicKey.getY().toByteArray());
168 } else if (publicKey.getAlgorithm().equals(KEY_FACTORY_TYPE_ECDSA) && publicKey instanceof BCECPublicKey) {
169 BCECPublicKey ecPublicKey = (BCECPublicKey) publicKey;
170 DataOutputStream dout = new DataOutputStream(byteOs);
171 dout.writeInt(KEY_TYPE_ECDSA.getBytes(StandardCharsets.UTF_8).length);
172 dout.write(KEY_TYPE_ECDSA.getBytes(StandardCharsets.UTF_8));
173 dout.writeInt(ECDSA_SUPPORTED_CURVE_NAME.getBytes(StandardCharsets.UTF_8).length);
174 dout.write(ECDSA_SUPPORTED_CURVE_NAME.getBytes(StandardCharsets.UTF_8));
176 byte[] coordX = ecPublicKey.getQ().getAffineXCoord().getEncoded();
177 byte[] coordY = ecPublicKey.getQ().getAffineYCoord().getEncoded();
178 dout.writeInt(coordX.length + coordY.length + 1);
179 dout.writeByte(0x04);
183 throw new IllegalArgumentException("Unknown public key encoding: " + publicKey.getAlgorithm());
185 return Base64.getEncoder().encodeToString(byteOs.toByteArray());