406 lines
14 KiB
Java
406 lines
14 KiB
Java
// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package pgp.cert_d;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileFilter;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import pgp.certificate_store.Key;
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import pgp.certificate_store.KeyMaterial;
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import pgp.certificate_store.KeyMerger;
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import pgp.certificate_store.KeyReaderBackend;
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import pgp.certificate_store.exception.BadDataException;
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import pgp.certificate_store.exception.BadNameException;
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import pgp.certificate_store.exception.NotAStoreException;
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import pgp.certificate_store.Certificate;
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import pgp.certificate_store.CertificateMerger;
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public class SharedPGPCertificateDirectoryImpl implements SharedPGPCertificateDirectory {
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private final FilenameResolver resolver;
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private final LockingMechanism writeLock;
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private final KeyReaderBackend keyReaderBackend;
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public SharedPGPCertificateDirectoryImpl(BackendProvider backendProvider)
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throws NotAStoreException {
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this(backendProvider.provideKeyReaderBackend());
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}
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public SharedPGPCertificateDirectoryImpl(KeyReaderBackend keyReaderBackend)
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throws NotAStoreException {
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this(
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BaseDirectoryProvider.getDefaultBaseDir(),
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keyReaderBackend);
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}
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public SharedPGPCertificateDirectoryImpl(File baseDirectory,
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KeyReaderBackend keyReaderBackend)
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throws NotAStoreException {
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this(
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keyReaderBackend,
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new FilenameResolver(baseDirectory),
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FileLockingMechanism.defaultDirectoryFileLock(baseDirectory));
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}
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public SharedPGPCertificateDirectoryImpl(
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KeyReaderBackend keyReaderBackend,
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FilenameResolver filenameResolver,
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LockingMechanism writeLock)
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throws NotAStoreException {
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this.keyReaderBackend = keyReaderBackend;
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this.resolver = filenameResolver;
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this.writeLock = writeLock;
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File baseDirectory = resolver.getBaseDirectory();
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if (!baseDirectory.exists()) {
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if (!baseDirectory.mkdirs()) {
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throw new NotAStoreException("Cannot create base directory '" + resolver.getBaseDirectory().getAbsolutePath() + "'");
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}
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} else {
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if (baseDirectory.isFile()) {
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throw new NotAStoreException("Base directory '" + resolver.getBaseDirectory().getAbsolutePath() + "' appears to be a file.");
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}
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}
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}
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@Override
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public LockingMechanism getLock() {
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return writeLock;
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}
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@Override
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public Certificate getByFingerprint(String fingerprint)
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throws IOException, BadNameException, BadDataException {
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File certFile = resolver.getCertFileByFingerprint(fingerprint);
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if (!certFile.exists()) {
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return null;
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}
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FileInputStream fileIn = new FileInputStream(certFile);
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BufferedInputStream bufferedIn = new BufferedInputStream(fileIn);
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Certificate certificate = readCertificate(bufferedIn);
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if (!certificate.getFingerprint().equals(fingerprint)) {
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// TODO: Figure out more suitable exception
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throw new BadDataException();
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}
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return certificate;
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}
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private Certificate readCertificate(InputStream inputStream) throws BadDataException, IOException {
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KeyMaterial record = keyReaderBackend.read(inputStream);
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Certificate certificate = null;
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if (record instanceof Certificate) {
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certificate = (Certificate) record;
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} else if (record instanceof Key) {
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Key key = (Key) record;
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certificate = key.getCertificate();
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} else {
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throw new BadDataException();
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}
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return certificate;
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}
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private Key readKey(InputStream inputStream) throws BadDataException, IOException {
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KeyMaterial record = keyReaderBackend.read(inputStream);
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if (record instanceof Key) {
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return (Key) record;
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}
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throw new BadDataException();
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}
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@Override
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public Certificate getBySpecialName(String specialName)
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throws IOException, BadNameException, BadDataException {
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File certFile = resolver.getCertFileBySpecialName(specialName);
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if (!certFile.exists()) {
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return null;
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}
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FileInputStream fileIn = new FileInputStream(certFile);
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BufferedInputStream bufferedIn = new BufferedInputStream(fileIn);
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Certificate certificate = readCertificate(bufferedIn);
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return certificate;
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}
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@Override
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public Certificate getByFingerprintIfChanged(String fingerprint, String tag)
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throws IOException, BadNameException, BadDataException {
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Certificate certificate = getByFingerprint(fingerprint);
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if (certificate.getTag().equals(tag)) {
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return null;
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}
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return certificate;
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}
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@Override
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public Certificate getBySpecialNameIfChanged(String specialName, String tag)
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throws IOException, BadNameException, BadDataException {
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Certificate certificate = getBySpecialName(specialName);
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if (certificate.getTag().equals(tag)) {
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return null;
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}
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return certificate;
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}
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@Override
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public Key getTrustRoot() throws IOException, BadDataException {
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File keyFile;
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try {
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keyFile = resolver.getKeyFileBySpecialName(SpecialNames.TRUST_ROOT);
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} catch (BadNameException e) {
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throw new RuntimeException("trust-root MUST be a known special name", e);
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}
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if (!keyFile.exists()) {
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return null;
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}
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FileInputStream fileIn = new FileInputStream(keyFile);
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BufferedInputStream bufferedInputStream = new BufferedInputStream(fileIn);
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Key key = readKey(bufferedInputStream);
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return key;
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}
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@Override
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public Key getTrustRootIfChanged(String tag) throws IOException, BadDataException {
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// TODO: The tag is likely intended for performance improvements,
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// so really we should look it up somewhere without the need to parse the whole key.
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Key key = getTrustRoot();
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if (key.getTag().equals(tag)) {
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return null;
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}
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return key;
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}
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@Override
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public Certificate insert(InputStream data, CertificateMerger merge)
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throws IOException, BadDataException, InterruptedException {
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writeLock.lockDirectory();
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Certificate certificate = _insert(data, merge);
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writeLock.releaseDirectory();
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return certificate;
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}
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@Override
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public Certificate tryInsert(InputStream data, CertificateMerger merge)
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throws IOException, BadDataException {
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if (!writeLock.tryLockDirectory()) {
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return null;
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}
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Certificate certificate = _insert(data, merge);
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writeLock.releaseDirectory();
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return certificate;
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}
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private Certificate _insert(InputStream data, CertificateMerger merge)
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throws IOException, BadDataException {
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Certificate newCertificate = readCertificate(data);
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Certificate existingCertificate;
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File certFile;
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try {
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existingCertificate = getByFingerprint(newCertificate.getFingerprint());
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certFile = resolver.getCertFileByFingerprint(newCertificate.getFingerprint());
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} catch (BadNameException e) {
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throw new BadDataException();
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}
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if (existingCertificate != null && !existingCertificate.getTag().equals(newCertificate.getTag())) {
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newCertificate = merge.merge(newCertificate, existingCertificate);
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}
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writeToFile(newCertificate.getInputStream(), certFile);
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return newCertificate;
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}
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private Key _insertTrustRoot(InputStream data, KeyMerger merge)
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throws IOException, BadDataException {
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Key newKey = readKey(data);
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Key existingKey;
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File keyFile;
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try {
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existingKey = getTrustRoot();
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keyFile = resolver.getKeyFileBySpecialName(SpecialNames.TRUST_ROOT);
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} catch (BadNameException e) {
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throw new RuntimeException(String.format("trust-root MUST be known special name.", e));
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}
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if (existingKey != null && !existingKey.getTag().equals(newKey.getTag())) {
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newKey = merge.merge(newKey, existingKey);
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}
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writeToFile(newKey.getInputStream(), keyFile);
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return newKey;
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}
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@Override
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public Key insertTrustRoot(InputStream data, KeyMerger merge) throws IOException, BadDataException, InterruptedException {
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writeLock.lockDirectory();
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Key key = _insertTrustRoot(data, merge);
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writeLock.releaseDirectory();
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return key;
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}
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@Override
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public Key tryInsertTrustRoot(InputStream data, KeyMerger merge) throws IOException, BadDataException {
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return null;
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}
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private void writeToFile(InputStream inputStream, File certFile)
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throws IOException {
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certFile.getParentFile().mkdirs();
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if (!certFile.exists() && !certFile.createNewFile()) {
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throw new IOException("Could not create cert file " + certFile.getAbsolutePath());
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}
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FileOutputStream fileOut = new FileOutputStream(certFile);
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byte[] buffer = new byte[4096];
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int read;
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while ((read = inputStream.read(buffer)) != -1) {
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fileOut.write(buffer, 0, read);
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}
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inputStream.close();
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fileOut.close();
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}
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@Override
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public Certificate insertWithSpecialName(String specialName, InputStream data, CertificateMerger merge)
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throws IOException, BadNameException, BadDataException, InterruptedException {
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writeLock.lockDirectory();
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Certificate certificate = _insertSpecial(specialName, data, merge);
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writeLock.releaseDirectory();
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return certificate;
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}
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@Override
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public Certificate tryInsertWithSpecialName(String specialName, InputStream data, CertificateMerger merge)
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throws IOException, BadNameException, BadDataException {
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if (!writeLock.tryLockDirectory()) {
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return null;
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}
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Certificate certificate = _insertSpecial(specialName, data, merge);
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writeLock.releaseDirectory();
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return certificate;
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}
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private Certificate _insertSpecial(String specialName, InputStream data, CertificateMerger merge)
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throws IOException, BadNameException, BadDataException {
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Certificate newCertificate = readCertificate(data);
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Certificate existingCertificate = getBySpecialName(specialName);
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File certFile = resolver.getCertFileBySpecialName(specialName);
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if (existingCertificate != null && !existingCertificate.getTag().equals(newCertificate.getTag())) {
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newCertificate = merge.merge(newCertificate, existingCertificate);
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}
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writeToFile(newCertificate.getInputStream(), certFile);
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return newCertificate;
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}
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@Override
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public Iterator<Certificate> items() {
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return new Iterator<Certificate>() {
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private final List<Lazy<Certificate>> certificateQueue = Collections.synchronizedList(new ArrayList<>());
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// Constructor... wtf.
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{
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File[] subdirectories = resolver.getBaseDirectory().listFiles(new FileFilter() {
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@Override
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public boolean accept(File file) {
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return file.isDirectory() && file.getName().matches("^[a-f0-9]{2}$");
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}
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});
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for (File subdirectory : subdirectories) {
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File[] files = subdirectory.listFiles(new FileFilter() {
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@Override
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public boolean accept(File file) {
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return file.isFile() && file.getName().matches("^[a-f0-9]{38}$");
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}
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});
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for (File certFile : files) {
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certificateQueue.add(new Lazy<Certificate>() {
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@Override
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Certificate get() throws BadDataException {
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try {
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Certificate certificate = readCertificate(new FileInputStream(certFile));
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if (!(subdirectory.getName() + certFile.getName()).equals(certificate.getFingerprint())) {
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throw new BadDataException();
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}
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return certificate;
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} catch (IOException e) {
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throw new AssertionError("File got deleted.");
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}
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}
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});
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}
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}
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}
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@Override
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public boolean hasNext() {
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return !certificateQueue.isEmpty();
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}
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@Override
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public Certificate next() {
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try {
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return certificateQueue.remove(0).get();
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} catch (BadDataException e) {
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throw new AssertionError("Could not retrieve item: " + e.getMessage());
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}
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}
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};
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}
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private abstract static class Lazy<E> {
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abstract E get() throws BadDataException;
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}
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@Override
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public Iterator<String> fingerprints() {
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Iterator<Certificate> certificates = items();
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return new Iterator<String>() {
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@Override
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public boolean hasNext() {
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return certificates.hasNext();
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}
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@Override
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public String next() {
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return certificates.next().getFingerprint();
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}
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};
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}
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}
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