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/*
* Copyright (C) 2024, Thomas Wolf <twolf@apache.org> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.signing.ssh;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.security.PublicKey;
import java.time.Instant;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import org.eclipse.jgit.annotations.NonNull;
import org.eclipse.jgit.lib.GpgConfig;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.signing.ssh.CachingSigningKeyDatabase;
import org.eclipse.jgit.signing.ssh.VerificationException;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.StringUtils;
/**
* A {@link CachingSigningKeyDatabase} using the OpenSSH allowed signers file
* and the OpenSSH key revocation list.
*/
public class OpenSshSigningKeyDatabase implements CachingSigningKeyDatabase {
// Keep caches of allowed signers and KRLs. Cache by canonical path.
private static final int DEFAULT_CACHE_SIZE = 5;
private AtomicInteger cacheSize = new AtomicInteger(DEFAULT_CACHE_SIZE);
private class LRU<K, V> extends LinkedHashMap<K, V> {
private static final long serialVersionUID = 1L;
LRU() {
super(DEFAULT_CACHE_SIZE, 0.75f, true);
}
@Override
protected boolean removeEldestEntry(java.util.Map.Entry<K, V> eldest) {
return size() > cacheSize.get();
}
}
private final HashMap<Path, AllowedSigners> allowedSigners = new LRU<>();
private final HashMap<Path, OpenSshKrl> revocations = new LRU<>();
@Override
public boolean isRevoked(Repository repository, GpgConfig config,
PublicKey key) throws IOException {
String fileName = config.getSshRevocationFile();
if (StringUtils.isEmptyOrNull(fileName)) {
return false;
}
File file = getFile(repository, fileName);
OpenSshKrl revocationList;
synchronized (revocations) {
revocationList = revocations.computeIfAbsent(file.toPath(),
OpenSshKrl::new);
}
return revocationList.isRevoked(key);
}
@Override
public String isAllowed(Repository repository, GpgConfig config,
PublicKey key, String namespace, PersonIdent ident)
throws IOException, VerificationException {
String fileName = config.getSshAllowedSignersFile();
if (StringUtils.isEmptyOrNull(fileName)) {
// No file configured. Git would error out.
return null;
}
File file = getFile(repository, fileName);
AllowedSigners allowed;
synchronized (allowedSigners) {
allowed = allowedSigners.computeIfAbsent(file.toPath(),
AllowedSigners::new);
}
Instant gitTime = null;
if (ident != null) {
gitTime = ident.getWhenAsInstant();
}
return allowed.isAllowed(key, namespace, null, gitTime);
}
private File getFile(@NonNull Repository repository, String fileName)
throws IOException {
File file;
if (fileName.startsWith("~/") //$NON-NLS-1$
|| fileName.startsWith('~' + File.separator)) {
file = FS.DETECTED.resolve(FS.DETECTED.userHome(),
fileName.substring(2));
} else {
file = new File(fileName);
if (!file.isAbsolute()) {
file = new File(repository.getWorkTree(), fileName);
}
}
return file.getCanonicalFile();
}
@Override
public int getCacheSize() {
return cacheSize.get();
}
@Override
public void setCacheSize(int size) {
if (size > 0) {
cacheSize.set(size);
pruneCache(size);
}
}
private void pruneCache(int size) {
prune(allowedSigners, size);
prune(revocations, size);
}
private void prune(HashMap<?, ?> map, int size) {
synchronized (map) {
if (map.size() <= size) {
return;
}
Iterator<?> iter = map.entrySet().iterator();
int i = 0;
while (iter.hasNext() && i < size) {
iter.next();
i++;
}
while (iter.hasNext()) {
iter.next();
iter.remove();
}
}
}
@Override
public void clearCache() {
synchronized (allowedSigners) {
allowedSigners.clear();
}
synchronized (revocations) {
revocations.clear();
}
}
}
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