590 lines
24 KiB
Java
590 lines
24 KiB
Java
// SPDX-FileCopyrightText: 2020 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.key.util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.List;
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import java.util.NoSuchElementException;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import org.bouncycastle.bcpg.S2K;
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import org.bouncycastle.bcpg.SecretKeyPacket;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPKeyRing;
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import org.bouncycastle.openpgp.PGPPrivateKey;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
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import org.bouncycastle.openpgp.PGPSecretKey;
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import org.bouncycastle.openpgp.PGPSecretKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.bouncycastle.openpgp.PGPUserAttributeSubpacketVector;
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import org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor;
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import org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor;
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import org.bouncycastle.util.Strings;
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import org.pgpainless.PGPainless;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.key.protection.SecretKeyRingProtector;
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import org.pgpainless.key.protection.UnlockSecretKey;
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import org.pgpainless.key.protection.fixes.S2KUsageFix;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public final class KeyRingUtils {
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private KeyRingUtils() {
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}
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private static final Logger LOGGER = LoggerFactory.getLogger(KeyRingUtils.class);
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/**
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* Return the primary {@link PGPSecretKey} from the provided {@link PGPSecretKeyRing}.
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* If it has no primary secret key, throw a {@link NoSuchElementException}.
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*
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* @param secretKeys secret keys
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* @return primary secret key
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*/
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@Nonnull
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public static PGPSecretKey requirePrimarySecretKeyFrom(@Nonnull PGPSecretKeyRing secretKeys) {
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PGPSecretKey primarySecretKey = getPrimarySecretKeyFrom(secretKeys);
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if (primarySecretKey == null) {
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throw new NoSuchElementException("Provided PGPSecretKeyRing has no primary secret key.");
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}
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return primarySecretKey;
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}
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/**
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* Return the primary {@link PGPSecretKey} from the provided {@link PGPSecretKeyRing} or null if it has none.
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*
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* @param secretKeys secret key ring
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* @return primary secret key
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*/
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@Nullable
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public static PGPSecretKey getPrimarySecretKeyFrom(@Nonnull PGPSecretKeyRing secretKeys) {
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PGPSecretKey secretKey = secretKeys.getSecretKey();
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if (secretKey.isMasterKey()) {
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return secretKey;
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}
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return null;
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}
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/**
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* Return the primary {@link PGPPublicKey} from the provided key ring.
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* Throws a {@link NoSuchElementException} if the key ring has no primary public key.
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*
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* @param keyRing key ring
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* @return primary public key
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*/
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@Nonnull
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public static PGPPublicKey requirePrimaryPublicKeyFrom(@Nonnull PGPKeyRing keyRing) {
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PGPPublicKey primaryPublicKey = getPrimaryPublicKeyFrom(keyRing);
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if (primaryPublicKey == null) {
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throw new NoSuchElementException("Provided PGPKeyRing has no primary public key.");
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}
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return primaryPublicKey;
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}
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/**
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* Return the primary {@link PGPPublicKey} from the provided key ring or null if it has none.
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*
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* @param keyRing key ring
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* @return primary public key
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*/
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@Nullable
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public static PGPPublicKey getPrimaryPublicKeyFrom(@Nonnull PGPKeyRing keyRing) {
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PGPPublicKey primaryPublicKey = keyRing.getPublicKey();
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if (primaryPublicKey.isMasterKey()) {
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return primaryPublicKey;
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}
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return null;
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}
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/**
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* Return the public key with the given subKeyId from the keyRing.
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* If no such subkey exists, return null.
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* @param keyRing key ring
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* @param subKeyId subkey id
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* @return subkey or null
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*/
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@Nullable
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public static PGPPublicKey getPublicKeyFrom(@Nonnull PGPKeyRing keyRing, long subKeyId) {
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return keyRing.getPublicKey(subKeyId);
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}
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/**
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* Require the public key with the given subKeyId from the keyRing.
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* If no such subkey exists, throw an {@link NoSuchElementException}.
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*
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* @param keyRing key ring
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* @param subKeyId subkey id
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* @return subkey
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*/
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@Nonnull
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public static PGPPublicKey requirePublicKeyFrom(@Nonnull PGPKeyRing keyRing, long subKeyId) {
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PGPPublicKey publicKey = getPublicKeyFrom(keyRing, subKeyId);
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if (publicKey == null) {
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throw new NoSuchElementException("KeyRing does not contain public key with keyID " + Long.toHexString(subKeyId));
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}
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return publicKey;
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}
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/**
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* Require the secret key with the given secret subKeyId from the secret keyRing.
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* If no such subkey exists, throw an {@link NoSuchElementException}.
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*
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* @param keyRing secret key ring
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* @param subKeyId subkey id
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* @return secret subkey
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*/
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@Nonnull
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public static PGPSecretKey requireSecretKeyFrom(@Nonnull PGPSecretKeyRing keyRing, long subKeyId) {
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PGPSecretKey secretKey = keyRing.getSecretKey(subKeyId);
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if (secretKey == null) {
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throw new NoSuchElementException("KeyRing does not contain secret key with keyID " + Long.toHexString(subKeyId));
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}
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return secretKey;
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}
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@Nonnull
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public static PGPPublicKeyRing publicKeys(@Nonnull PGPKeyRing keys) {
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if (keys instanceof PGPPublicKeyRing) {
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return (PGPPublicKeyRing) keys;
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} else if (keys instanceof PGPSecretKeyRing) {
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return publicKeyRingFrom((PGPSecretKeyRing) keys);
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} else {
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throw new IllegalArgumentException("Unknown keys class: " + keys.getClass().getName());
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}
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}
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/**
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* Extract a {@link PGPPublicKeyRing} containing all public keys from the provided {@link PGPSecretKeyRing}.
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*
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* @param secretKeys secret key ring
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* @return public key ring
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*/
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@Nonnull
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public static PGPPublicKeyRing publicKeyRingFrom(@Nonnull PGPSecretKeyRing secretKeys) {
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List<PGPPublicKey> publicKeyList = new ArrayList<>();
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Iterator<PGPPublicKey> publicKeyIterator = secretKeys.getPublicKeys();
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while (publicKeyIterator.hasNext()) {
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publicKeyList.add(publicKeyIterator.next());
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}
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PGPPublicKeyRing publicKeyRing = new PGPPublicKeyRing(publicKeyList);
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return publicKeyRing;
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}
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/**
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* Extract {@link PGPPublicKeyRing PGPPublicKeyRings} from all {@link PGPSecretKeyRing PGPSecretKeyRings} in
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* the given {@link PGPSecretKeyRingCollection} and return them as a {@link PGPPublicKeyRingCollection}.
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*
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* @param secretKeyRings secret key ring collection
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* @return public key ring collection
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*/
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@Nonnull
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public static PGPPublicKeyRingCollection publicKeyRingCollectionFrom(@Nonnull PGPSecretKeyRingCollection secretKeyRings) {
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List<PGPPublicKeyRing> certificates = new ArrayList<>();
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for (PGPSecretKeyRing secretKey : secretKeyRings) {
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certificates.add(PGPainless.extractCertificate(secretKey));
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}
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return new PGPPublicKeyRingCollection(certificates);
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}
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/**
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* Unlock a {@link PGPSecretKey} and return the resulting {@link PGPPrivateKey}.
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*
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* @param secretKey secret key
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* @param protector protector to unlock the secret key
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* @return private key
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*
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* @throws PGPException if something goes wrong (e.g. wrong passphrase)
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*/
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@Nonnull
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public static PGPPrivateKey unlockSecretKey(@Nonnull PGPSecretKey secretKey, @Nonnull SecretKeyRingProtector protector)
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throws PGPException {
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return UnlockSecretKey.unlockSecretKey(secretKey, protector);
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}
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/**
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* Create a new {@link PGPPublicKeyRingCollection} from an array of {@link PGPPublicKeyRing PGPPublicKeyRings}.
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*
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* @param rings array of public key rings
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* @return key ring collection
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*/
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@Nonnull
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public static PGPPublicKeyRingCollection keyRingsToKeyRingCollection(@Nonnull PGPPublicKeyRing... rings) {
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return new PGPPublicKeyRingCollection(Arrays.asList(rings));
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}
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/**
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* Create a new {@link PGPSecretKeyRingCollection} from an array of {@link PGPSecretKeyRing PGPSecretKeyRings}.
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*
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* @param rings array of secret key rings
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* @return secret key ring collection
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*/
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@Nonnull
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public static PGPSecretKeyRingCollection keyRingsToKeyRingCollection(@Nonnull PGPSecretKeyRing... rings) {
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return new PGPSecretKeyRingCollection(Arrays.asList(rings));
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}
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/**
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* Return true, if the given {@link PGPPublicKeyRing} contains a {@link PGPPublicKey} for the given key id.
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*
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* @param ring public key ring
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* @param keyId id of the key in question
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* @return true if ring contains said key, false otherwise
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*/
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public static boolean keyRingContainsKeyWithId(@Nonnull PGPPublicKeyRing ring,
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long keyId) {
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return ring.getPublicKey(keyId) != null;
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}
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/**
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* Inject a key certification for the primary key into the given key ring.
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*
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* @param keyRing key ring
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* @param certification key signature
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* @return key ring with injected signature
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* @param <T> either {@link PGPPublicKeyRing} or {@link PGPSecretKeyRing}
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*/
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@Nonnull
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public static <T extends PGPKeyRing> T injectCertification(@Nonnull T keyRing,
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@Nonnull PGPSignature certification) {
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return injectCertification(keyRing, keyRing.getPublicKey(), certification);
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}
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/**
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* Inject a key certification for the given key into the given key ring.
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*
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* @param keyRing key ring
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* @param certifiedKey signed public key
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* @param certification key signature
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* @param <T> either {@link PGPPublicKeyRing} or {@link PGPSecretKeyRing}
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* @return key ring with injected signature
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*
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* @throws NoSuchElementException in case that the signed key is not part of the key ring
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*/
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@Nonnull
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public static <T extends PGPKeyRing> T injectCertification(@Nonnull T keyRing,
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@Nonnull PGPPublicKey certifiedKey,
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@Nonnull PGPSignature certification) {
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PGPSecretKeyRing secretKeys = null;
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PGPPublicKeyRing publicKeys;
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if (keyRing instanceof PGPSecretKeyRing) {
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secretKeys = (PGPSecretKeyRing) keyRing;
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publicKeys = PGPainless.extractCertificate(secretKeys);
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} else {
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publicKeys = (PGPPublicKeyRing) keyRing;
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}
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certifiedKey = PGPPublicKey.addCertification(certifiedKey, certification);
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List<PGPPublicKey> publicKeyList = new ArrayList<>();
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Iterator<PGPPublicKey> publicKeyIterator = publicKeys.iterator();
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boolean added = false;
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while (publicKeyIterator.hasNext()) {
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PGPPublicKey key = publicKeyIterator.next();
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if (key.getKeyID() == certifiedKey.getKeyID()) {
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added = true;
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publicKeyList.add(certifiedKey);
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} else {
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publicKeyList.add(key);
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}
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}
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if (!added) {
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throw new NoSuchElementException("Cannot find public key with id " + Long.toHexString(certifiedKey.getKeyID()) + " in the provided key ring.");
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}
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publicKeys = new PGPPublicKeyRing(publicKeyList);
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if (secretKeys == null) {
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return (T) publicKeys;
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} else {
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secretKeys = PGPSecretKeyRing.replacePublicKeys(secretKeys, publicKeys);
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return (T) secretKeys;
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}
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}
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/**
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* Inject a user-id certification into the given key ring.
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*
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* @param keyRing key ring
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* @param userId signed user-id
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* @param certification signature
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* @param <T> either {@link PGPPublicKeyRing} or {@link PGPSecretKeyRing}
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* @return key ring with injected certification
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*/
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@Nonnull
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public static <T extends PGPKeyRing> T injectCertification(@Nonnull T keyRing,
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@Nonnull String userId,
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@Nonnull PGPSignature certification) {
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PGPSecretKeyRing secretKeys = null;
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PGPPublicKeyRing publicKeys;
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if (keyRing instanceof PGPSecretKeyRing) {
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secretKeys = (PGPSecretKeyRing) keyRing;
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publicKeys = PGPainless.extractCertificate(secretKeys);
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} else {
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publicKeys = (PGPPublicKeyRing) keyRing;
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}
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Iterator<PGPPublicKey> publicKeyIterator = publicKeys.iterator();
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PGPPublicKey primaryKey = publicKeyIterator.next();
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primaryKey = PGPPublicKey.addCertification(primaryKey, userId, certification);
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List<PGPPublicKey> publicKeyList = new ArrayList<>();
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publicKeyList.add(primaryKey);
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while (publicKeyIterator.hasNext()) {
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publicKeyList.add(publicKeyIterator.next());
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}
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publicKeys = new PGPPublicKeyRing(publicKeyList);
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if (secretKeys == null) {
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return (T) publicKeys;
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} else {
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secretKeys = PGPSecretKeyRing.replacePublicKeys(secretKeys, publicKeys);
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return (T) secretKeys;
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}
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}
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/**
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* Inject a user-attribute vector certification into the given key ring.
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*
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* @param keyRing key ring
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* @param userAttributes certified user attributes
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* @param certification certification signature
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* @param <T> either {@link PGPPublicKeyRing} or {@link PGPSecretKeyRing}
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* @return key ring with injected user-attribute certification
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*/
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@Nonnull
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public static <T extends PGPKeyRing> T injectCertification(@Nonnull T keyRing,
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@Nonnull PGPUserAttributeSubpacketVector userAttributes,
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@Nonnull PGPSignature certification) {
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PGPSecretKeyRing secretKeys = null;
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PGPPublicKeyRing publicKeys;
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if (keyRing instanceof PGPSecretKeyRing) {
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secretKeys = (PGPSecretKeyRing) keyRing;
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publicKeys = PGPainless.extractCertificate(secretKeys);
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} else {
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publicKeys = (PGPPublicKeyRing) keyRing;
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}
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Iterator<PGPPublicKey> publicKeyIterator = publicKeys.iterator();
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PGPPublicKey primaryKey = publicKeyIterator.next();
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primaryKey = PGPPublicKey.addCertification(primaryKey, userAttributes, certification);
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List<PGPPublicKey> publicKeyList = new ArrayList<>();
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publicKeyList.add(primaryKey);
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while (publicKeyIterator.hasNext()) {
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publicKeyList.add(publicKeyIterator.next());
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}
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publicKeys = new PGPPublicKeyRing(publicKeyList);
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if (secretKeys == null) {
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return (T) publicKeys;
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} else {
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secretKeys = PGPSecretKeyRing.replacePublicKeys(secretKeys, publicKeys);
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return (T) secretKeys;
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}
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}
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/**
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* Inject a {@link PGPPublicKey} into the given key ring.
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*
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* @param keyRing key ring
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* @param publicKey public key
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* @param <T> either {@link PGPPublicKeyRing} or {@link PGPSecretKeyRing}
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* @return key ring with injected public key
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*/
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@Nonnull
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public static <T extends PGPKeyRing> T keysPlusPublicKey(@Nonnull T keyRing,
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@Nonnull PGPPublicKey publicKey) {
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PGPSecretKeyRing secretKeys = null;
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PGPPublicKeyRing publicKeys;
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if (keyRing instanceof PGPSecretKeyRing) {
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secretKeys = (PGPSecretKeyRing) keyRing;
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publicKeys = PGPainless.extractCertificate(secretKeys);
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} else {
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publicKeys = (PGPPublicKeyRing) keyRing;
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}
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publicKeys = PGPPublicKeyRing.insertPublicKey(publicKeys, publicKey);
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if (secretKeys == null) {
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return (T) publicKeys;
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} else {
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secretKeys = PGPSecretKeyRing.insertOrReplacePublicKey(secretKeys, publicKey);
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return (T) secretKeys;
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}
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}
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/**
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* Inject a {@link PGPSecretKey} into a {@link PGPSecretKeyRing}.
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*
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* @param secretKeys secret key ring
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* @param secretKey secret key
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* @return secret key ring with injected secret key
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*/
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@Nonnull
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public static PGPSecretKeyRing keysPlusSecretKey(@Nonnull PGPSecretKeyRing secretKeys,
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@Nonnull PGPSecretKey secretKey) {
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return PGPSecretKeyRing.insertSecretKey(secretKeys, secretKey);
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}
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/**
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* Inject the given signature into the public part of the given secret key.
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* @param secretKey secret key
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* @param signature signature
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* @return secret key with the signature injected in its public key
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*/
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@Nonnull
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public static PGPSecretKey secretKeyPlusSignature(@Nonnull PGPSecretKey secretKey,
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@Nonnull PGPSignature signature) {
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PGPPublicKey publicKey = secretKey.getPublicKey();
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publicKey = PGPPublicKey.addCertification(publicKey, signature);
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PGPSecretKey newSecretKey = PGPSecretKey.replacePublicKey(secretKey, publicKey);
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return newSecretKey;
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}
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/**
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* Remove the secret key of the subkey identified by the given secret key id from the key ring.
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* The public part stays attached to the key ring, so that it can still be used for encryption / verification of signatures.
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*
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* This method is intended to be used to remove secret primary keys from live keys when those are kept in offline storage.
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*
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* @param secretKeys secret key ring
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* @param secretKeyId id of the secret key to remove
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* @return secret key ring with removed secret key
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*
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* @throws IOException in case of an error during serialization / deserialization of the key
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* @throws PGPException in case of a broken key
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*/
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@Nonnull
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public static PGPSecretKeyRing stripSecretKey(@Nonnull PGPSecretKeyRing secretKeys,
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long secretKeyId)
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throws IOException, PGPException {
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if (secretKeys.getPublicKey().getKeyID() == secretKeyId) {
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throw new IllegalArgumentException("Bouncy Castle currently cannot deal with stripped secret primary keys.");
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}
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if (secretKeys.getSecretKey(secretKeyId) == null) {
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throw new NoSuchElementException("PGPSecretKeyRing does not contain secret key " + Long.toHexString(secretKeyId));
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}
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// Since BCs constructors for secret key rings are mostly private, we need to encode the key ring how we want it
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// and then parse it again.
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ByteArrayOutputStream encoded = new ByteArrayOutputStream();
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for (PGPSecretKey secretKey : secretKeys) {
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if (secretKey.getKeyID() == secretKeyId) {
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// only encode the public part of the target key
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secretKey.getPublicKey().encode(encoded);
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} else {
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// otherwise, encode secret + public key
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secretKey.encode(encoded);
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}
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}
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for (Iterator<PGPPublicKey> it = secretKeys.getExtraPublicKeys(); it.hasNext(); ) {
|
|
PGPPublicKey extra = it.next();
|
|
extra.encode(encoded);
|
|
}
|
|
// Parse the key back into an object
|
|
return new PGPSecretKeyRing(encoded.toByteArray(), ImplementationFactory.getInstance().getKeyFingerprintCalculator());
|
|
}
|
|
|
|
/**
|
|
* Strip all user-ids, user-attributes and signatures from the given public key.
|
|
*
|
|
* @param bloatedKey public key
|
|
* @return stripped public key
|
|
* @throws PGPException if the packet is faulty or the required calculations fail
|
|
*/
|
|
public static PGPPublicKey getStrippedDownPublicKey(PGPPublicKey bloatedKey) throws PGPException {
|
|
return new PGPPublicKey(bloatedKey.getPublicKeyPacket(), ImplementationFactory.getInstance().getKeyFingerprintCalculator());
|
|
}
|
|
|
|
public static List<String> getUserIdsIgnoringInvalidUTF8(PGPPublicKey key) {
|
|
List<String> userIds = new ArrayList<>();
|
|
Iterator<byte[]> it = key.getRawUserIDs();
|
|
while (it.hasNext()) {
|
|
byte[] rawUserId = it.next();
|
|
try {
|
|
userIds.add(Strings.fromUTF8ByteArray(rawUserId));
|
|
} catch (IllegalArgumentException e) {
|
|
LOGGER.warn("Invalid UTF-8 user-ID encountered: " + new String(rawUserId));
|
|
}
|
|
}
|
|
return userIds;
|
|
}
|
|
|
|
public static PGPSecretKeyRing changePassphrase(Long keyId,
|
|
PGPSecretKeyRing secretKeys,
|
|
SecretKeyRingProtector oldProtector,
|
|
SecretKeyRingProtector newProtector)
|
|
throws PGPException {
|
|
List<PGPSecretKey> secretKeyList = new ArrayList<>();
|
|
if (keyId == null) {
|
|
// change passphrase of whole key ring
|
|
Iterator<PGPSecretKey> secretKeyIterator = secretKeys.getSecretKeys();
|
|
while (secretKeyIterator.hasNext()) {
|
|
PGPSecretKey secretKey = secretKeyIterator.next();
|
|
secretKey = KeyRingUtils.reencryptPrivateKey(secretKey, oldProtector, newProtector);
|
|
secretKeyList.add(secretKey);
|
|
}
|
|
} else {
|
|
// change passphrase of selected subkey only
|
|
Iterator<PGPSecretKey> secretKeyIterator = secretKeys.getSecretKeys();
|
|
while (secretKeyIterator.hasNext()) {
|
|
PGPSecretKey secretKey = secretKeyIterator.next();
|
|
if (secretKey.getPublicKey().getKeyID() == keyId) {
|
|
// Re-encrypt only the selected subkey
|
|
secretKey = KeyRingUtils.reencryptPrivateKey(secretKey, oldProtector, newProtector);
|
|
}
|
|
secretKeyList.add(secretKey);
|
|
}
|
|
}
|
|
|
|
PGPSecretKeyRing newRing = new PGPSecretKeyRing(secretKeyList);
|
|
newRing = s2kUsageFixIfNecessary(newRing, newProtector);
|
|
return newRing;
|
|
}
|
|
|
|
|
|
public static PGPSecretKey reencryptPrivateKey(
|
|
PGPSecretKey secretKey,
|
|
SecretKeyRingProtector oldProtector,
|
|
SecretKeyRingProtector newProtector)
|
|
throws PGPException {
|
|
S2K s2k = secretKey.getS2K();
|
|
// If the key uses GNU_DUMMY_S2K, we leave it as is and skip this block
|
|
if (s2k == null || s2k.getType() != S2K.GNU_DUMMY_S2K) {
|
|
long secretKeyId = secretKey.getKeyID();
|
|
PBESecretKeyDecryptor decryptor = oldProtector.getDecryptor(secretKeyId);
|
|
PBESecretKeyEncryptor encryptor = newProtector.getEncryptor(secretKeyId);
|
|
secretKey = PGPSecretKey.copyWithNewPassword(secretKey, decryptor, encryptor);
|
|
}
|
|
return secretKey;
|
|
}
|
|
|
|
|
|
public static PGPSecretKeyRing s2kUsageFixIfNecessary(PGPSecretKeyRing secretKeys, SecretKeyRingProtector protector)
|
|
throws PGPException {
|
|
boolean hasS2KUsageChecksum = false;
|
|
for (PGPSecretKey secKey : secretKeys) {
|
|
if (secKey.getS2KUsage() == SecretKeyPacket.USAGE_CHECKSUM) {
|
|
hasS2KUsageChecksum = true;
|
|
break;
|
|
}
|
|
}
|
|
if (hasS2KUsageChecksum) {
|
|
secretKeys = S2KUsageFix.replaceUsageChecksumWithUsageSha1(
|
|
secretKeys, protector, true);
|
|
}
|
|
return secretKeys;
|
|
}
|
|
}
|