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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.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.security.PublicKey;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.apache.sshd.common.config.keys.OpenSshCertificate;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.apache.sshd.common.util.io.ModifiableFileWatcher;
import org.eclipse.jgit.util.IO;
/**
* An implementation of an OpenSSH key revocation list (KRL), either a binary
* KRL or a simple list of public keys.
*/
class OpenSshKrl extends ModifiableFileWatcher {
private static record State(Set<String> keys, OpenSshBinaryKrl krl) {
// Empty
}
private State state;
public OpenSshKrl(Path path) {
super(path);
state = new State(Set.of(), null);
}
public boolean isRevoked(PublicKey key) throws IOException {
State current = refresh();
return isRevoked(current, key);
}
private boolean isRevoked(State current, PublicKey key) {
if (key instanceof OpenSshCertificate cert) {
OpenSshBinaryKrl krl = current.krl();
if (krl != null && krl.isRevoked(cert)) {
return true;
}
if (isRevoked(current, cert.getCaPubKey())
|| isRevoked(current, cert.getCertPubKey())) {
return true;
}
return false;
}
OpenSshBinaryKrl krl = current.krl();
if (krl != null) {
return krl.isRevoked(key);
}
return current.keys().contains(PublicKeyEntry.toString(key));
}
private synchronized State refresh() throws IOException {
if (checkReloadRequired()) {
updateReloadAttributes();
try {
state = reload(getPath());
} catch (NoSuchFileException e) {
// File disappeared
resetReloadAttributes();
state = new State(Set.of(), null);
}
}
return state;
}
private static State reload(Path path) throws IOException {
try (BufferedInputStream in = new BufferedInputStream(
Files.newInputStream(path))) {
byte[] magic = new byte[OpenSshBinaryKrl.MAGIC.length];
in.mark(magic.length);
IO.readFully(in, magic);
if (Arrays.equals(magic, OpenSshBinaryKrl.MAGIC)) {
return new State(null, OpenSshBinaryKrl.load(in, true));
}
// Otherwise try reading it textually
in.reset();
return loadTextKrl(in);
}
}
private static State loadTextKrl(InputStream in) throws IOException {
Set<String> keys = new HashSet<>();
try (BufferedReader r = new BufferedReader(
new InputStreamReader(in, StandardCharsets.UTF_8))) {
String line;
for (;;) {
line = r.readLine();
if (line == null) {
break;
}
line = line.strip();
if (line.isEmpty() || line.charAt(0) == '#') {
continue;
}
keys.add(AllowedSigners.parsePublicKey(line, 0));
}
}
return new State(keys, null);
}
}
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