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JSch is a pure Java implementation of SSH2
/*
* Copyright (c) 2012 ymnk, JCraft,Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided with
* the distribution.
*
* 3. The names of the authors may not be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcraft.jsch;
import java.util.Vector;
class AgentProxy {
private static final byte SSH_AGENTC_REQUEST_RSA_IDENTITIES = 1;
private static final byte SSH_AGENT_RSA_IDENTITIES_ANSWER = 2;
private static final byte SSH_AGENTC_RSA_CHALLENGE = 3;
private static final byte SSH_AGENT_RSA_RESPONSE = 4;
private static final byte SSH_AGENT_FAILURE = 5;
private static final byte SSH_AGENT_SUCCESS = 6;
private static final byte SSH_AGENTC_ADD_RSA_IDENTITY = 7;
private static final byte SSH_AGENTC_REMOVE_RSA_IDENTITY = 8;
private static final byte SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES = 9;
private static final byte SSH2_AGENTC_REQUEST_IDENTITIES = 11;
private static final byte SSH2_AGENT_IDENTITIES_ANSWER = 12;
private static final byte SSH2_AGENTC_SIGN_REQUEST = 13;
private static final byte SSH2_AGENT_SIGN_RESPONSE = 14;
private static final byte SSH2_AGENTC_ADD_IDENTITY = 17;
private static final byte SSH2_AGENTC_REMOVE_IDENTITY = 18;
private static final byte SSH2_AGENTC_REMOVE_ALL_IDENTITIES = 19;
private static final byte SSH_AGENTC_ADD_SMARTCARD_KEY = 20;
private static final byte SSH_AGENTC_REMOVE_SMARTCARD_KEY = 21;
private static final byte SSH_AGENTC_LOCK = 22;
private static final byte SSH_AGENTC_UNLOCK = 23;
private static final byte SSH_AGENTC_ADD_RSA_ID_CONSTRAINED = 24;
private static final byte SSH2_AGENTC_ADD_ID_CONSTRAINED = 25;
private static final byte SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED = 26;
private static final byte SSH_AGENT_CONSTRAIN_LIFETIME = 1;
private static final byte SSH_AGENT_CONSTRAIN_CONFIRM = 2;
private static final byte SSH2_AGENT_FAILURE = 30;
private static final byte SSH_COM_AGENT2_FAILURE = 102;
// private static final byte SSH_AGENT_OLD_SIGNATURE = 0x1;
private static final int SSH_AGENT_RSA_SHA2_256 = 0x2;
private static final int SSH_AGENT_RSA_SHA2_512 = 0x4;
private static final int MAX_AGENT_IDENTITIES = 2048;
private final byte[] buf = new byte[1024];
private final Buffer buffer = new Buffer(buf);
private AgentConnector connector;
AgentProxy(AgentConnector connector) {
this.connector = connector;
}
synchronized Vector getIdentities() {
Vector identities = new Vector<>();
int required_size = 1 + 4;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_REQUEST_IDENTITIES);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
buffer.rewind();
buffer.putByte(SSH_AGENT_FAILURE);
return identities;
}
int rcode = buffer.getByte();
// System.out.println(rcode == SSH2_AGENT_IDENTITIES_ANSWER);
if (rcode != SSH2_AGENT_IDENTITIES_ANSWER) {
return identities;
}
int count = buffer.getInt();
// System.out.println(count);
if (count <= 0 || count > MAX_AGENT_IDENTITIES) {
return identities;
}
for (int i = 0; i < count; i++) {
byte[] blob = buffer.getString();
String comment = Util.byte2str(buffer.getString());
identities.add(new AgentIdentity(this, blob, comment));
}
return identities;
}
synchronized byte[] sign(byte[] blob, byte[] data, String alg) {
int flags = 0x0;
if (alg != null) {
if (alg.equals("rsa-sha2-256")) {
flags = SSH_AGENT_RSA_SHA2_256;
} else if (alg.equals("rsa-sha2-512")) {
flags = SSH_AGENT_RSA_SHA2_512;
}
}
int required_size = 1 + 4 * 4 + blob.length + data.length;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_SIGN_REQUEST);
buffer.putString(blob);
buffer.putString(data);
buffer.putInt(flags);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
buffer.rewind();
buffer.putByte(SSH_AGENT_FAILURE);
}
int rcode = buffer.getByte();
// System.out.println(rcode == SSH2_AGENT_SIGN_RESPONSE);
if (rcode != SSH2_AGENT_SIGN_RESPONSE) {
return null;
}
return buffer.getString();
}
synchronized boolean removeIdentity(byte[] blob) {
int required_size = 1 + 4 * 2 + blob.length;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_REMOVE_IDENTITY);
buffer.putString(blob);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
buffer.rewind();
buffer.putByte(SSH_AGENT_FAILURE);
}
int rcode = buffer.getByte();
// System.out.println(rcode == SSH_AGENT_SUCCESS);
return rcode == SSH_AGENT_SUCCESS;
}
synchronized void removeAllIdentities() {
int required_size = 1 + 4;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_REMOVE_ALL_IDENTITIES);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
buffer.rewind();
buffer.putByte(SSH_AGENT_FAILURE);
}
// int rcode = buffer.getByte();
// System.out.println(rcode == SSH_AGENT_SUCCESS);
}
synchronized boolean addIdentity(byte[] identity) {
int required_size = 1 + 4 + identity.length;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_ADD_IDENTITY);
buffer.putByte(identity);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
buffer.rewind();
buffer.putByte(SSH_AGENT_FAILURE);
}
int rcode = buffer.getByte();
// System.out.println(rcode == SSH_AGENT_SUCCESS);
return rcode == SSH_AGENT_SUCCESS;
}
synchronized boolean isRunning() {
int required_size = 1 + 4;
buffer.reset();
buffer.checkFreeSize(required_size);
buffer.putInt(required_size - 4);
buffer.putByte(SSH2_AGENTC_REQUEST_IDENTITIES);
try {
connector.query(buffer);
} catch (AgentProxyException e) {
return false;
}
int rcode = buffer.getByte();
// System.out.println(rcode == SSH2_AGENT_IDENTITIES_ANSWER);
return rcode == SSH2_AGENT_IDENTITIES_ANSWER;
}
synchronized AgentConnector getConnector() {
return connector;
}
}