org.apache.sshd.common.keyprovider.KeyPairProvider Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.sshd.common.keyprovider;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Objects;
import java.util.stream.Collectors;
import org.apache.sshd.common.cipher.ECCurves;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;
/**
* Provider for key pairs. This provider is used on the server side to provide the host key, or on the client side to
* provide the user key.
*
* @author Apache MINA SSHD Project
*/
public interface KeyPairProvider extends KeyIdentityProvider {
/**
* SSH identifier for RSA keys
*/
String SSH_RSA = "ssh-rsa";
/**
* SSH identifier for DSA keys
*/
String SSH_DSS = "ssh-dss";
/**
* SSH identifier for ED25519 elliptic curve keys
*/
String SSH_ED25519 = "ssh-ed25519";
/**
* SSH identifier for EC keys in NIST curve P-256
*/
String ECDSA_SHA2_NISTP256 = ECCurves.nistp256.getKeyType();
/**
* SSH identifier for EC keys in NIST curve P-384
*/
String ECDSA_SHA2_NISTP384 = ECCurves.nistp384.getKeyType();
/**
* SSH identifier for EC keys in NIST curve P-521
*/
String ECDSA_SHA2_NISTP521 = ECCurves.nistp521.getKeyType();
/**
* SSH identifier for openssh cert keys
*/
String SSH_RSA_CERT = "[email protected]";
String SSH_DSS_CERT = "[email protected]";
String SSH_ED25519_CERT = "[email protected]";
String SSH_ECDSA_SHA2_NISTP256_CERT = "[email protected]";
String SSH_ECDSA_SHA2_NISTP384_CERT = "[email protected]";
String SSH_ECDSA_SHA2_NISTP521_CERT = "[email protected]";
/**
* A {@link KeyPairProvider} that has no keys
*/
KeyPairProvider EMPTY_KEYPAIR_PROVIDER = new KeyPairProvider() {
@Override
public KeyPair loadKey(SessionContext session, String type) {
return null;
}
@Override
public Iterable getKeyTypes(SessionContext session) {
return Collections.emptySet();
}
@Override
public Iterable loadKeys(SessionContext session) {
return Collections.emptyList();
}
@Override
public String toString() {
return "EMPTY_KEYPAIR_PROVIDER";
}
};
/**
* Load a key of the specified type which can be "ssh-rsa", "ssh-dss", or
* "ecdsa-sha2-nistp{256,384,521}". If there is no key of this type, return {@code null}
*
* @param session The {@link SessionContext} for invoking this load command - may be {@code null}
* if not invoked within a session context (e.g., offline tool).
* @param type the type of key to load
* @return a valid key pair or {@code null} if this type of key is not available
* @throws IOException If failed to read/parse the keys data
* @throws GeneralSecurityException If failed to generate the keys
*/
default KeyPair loadKey(SessionContext session, String type)
throws IOException, GeneralSecurityException {
ValidateUtils.checkNotNullAndNotEmpty(type, "No key type to load");
return GenericUtils.stream(loadKeys(session))
.filter(key -> type.equals(KeyUtils.getKeyType(key)))
.findFirst()
.orElse(null);
}
/**
* @param session The {@link SessionContext} for invoking this load command - may be {@code null}
* if not invoked within a session context (e.g., offline tool).
* @return The available {@link Iterable} key types - never {@code null}
* @throws IOException If failed to read/parse the keys data
* @throws GeneralSecurityException If failed to generate the keys
*/
default Iterable getKeyTypes(SessionContext session)
throws IOException, GeneralSecurityException {
return GenericUtils.stream(loadKeys(session))
.map(KeyUtils::getKeyType)
.filter(GenericUtils::isNotEmpty)
.collect(Collectors.toSet());
}
/**
* Wrap the provided {@link KeyPair}s into a {@link KeyPairProvider}
*
* @param pairs The available pairs - ignored if {@code null}/empty (i.e., returns {@link #EMPTY_KEYPAIR_PROVIDER})
* @return The provider wrapper
* @see #wrap(Iterable)
*/
static KeyPairProvider wrap(KeyPair... pairs) {
return GenericUtils.isEmpty(pairs) ? EMPTY_KEYPAIR_PROVIDER : wrap(Arrays.asList(pairs));
}
/**
* Wrap the provided {@link KeyPair}s into a {@link KeyPairProvider}
*
* @param pairs The available pairs {@link Iterable} - ignored if {@code null} (i.e., returns
* {@link #EMPTY_KEYPAIR_PROVIDER})
* @return The provider wrapper
*/
static KeyPairProvider wrap(Iterable pairs) {
return (pairs == null) ? EMPTY_KEYPAIR_PROVIDER : new KeyPairProvider() {
@Override
public Iterable loadKeys(SessionContext session) {
return pairs;
}
@Override
public KeyPair loadKey(SessionContext session, String type) {
for (KeyPair kp : pairs) {
String t = KeyUtils.getKeyType(kp);
if (Objects.equals(type, t)) {
return kp;
}
}
return null;
}
@Override
public Iterable getKeyTypes(SessionContext session) {
// use a LinkedHashSet so as to preserve the order but avoid duplicates
Collection types = new LinkedHashSet<>();
for (KeyPair kp : pairs) {
String t = KeyUtils.getKeyType(kp);
if (GenericUtils.isEmpty(t)) {
continue; // avoid unknown key types
}
if (!types.add(t)) {
continue; // debug breakpoint
}
}
return types;
}
};
}
}
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