001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.io;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.io.ByteArrayInputStream;
007import java.io.IOException;
008import java.io.InputStream;
009import java.nio.file.Files;
010import java.nio.file.Path;
011import java.nio.file.Paths;
012import java.security.GeneralSecurityException;
013import java.security.InvalidAlgorithmParameterException;
014import java.security.KeyStore;
015import java.security.KeyStoreException;
016import java.security.MessageDigest;
017import java.security.NoSuchAlgorithmException;
018import java.security.cert.CertificateEncodingException;
019import java.security.cert.CertificateException;
020import java.security.cert.CertificateFactory;
021import java.security.cert.PKIXParameters;
022import java.security.cert.TrustAnchor;
023import java.security.cert.X509Certificate;
024import java.util.Objects;
025
026import javax.net.ssl.SSLContext;
027import javax.net.ssl.TrustManagerFactory;
028
029import org.openstreetmap.josm.Main;
030import org.openstreetmap.josm.spi.preferences.Config;
031import org.openstreetmap.josm.tools.Logging;
032import org.openstreetmap.josm.tools.Utils;
033
034/**
035 * Class to add missing root certificates to the list of trusted certificates
036 * for TLS connections.
037 *
038 * The added certificates are deemed trustworthy by the main web browsers and
039 * operating systems, but not included in some distributions of Java.
040 *
041 * The certificates are added in-memory at each start, nothing is written to disk.
042 * @since 9995
043 */
044public final class CertificateAmendment {
045
046    /**
047     * A certificate amendment.
048     * @since 11943
049     */
050    public static class CertAmend {
051        private final String filename;
052        private final String sha256;
053
054        protected CertAmend(String filename, String sha256) {
055            this.filename = Objects.requireNonNull(filename);
056            this.sha256 = Objects.requireNonNull(sha256);
057        }
058
059        /**
060         * Returns the certificate filename.
061         * @return filename for both JOSM embedded certificate and Unix platform certificate
062         * @since 12241
063         */
064        public final String getFilename() {
065            return filename;
066        }
067
068        /**
069         * Returns the SHA-256 hash.
070         * @return the SHA-256 hash, in hexadecimal
071         */
072        public final String getSha256() {
073            return sha256;
074        }
075    }
076
077    /**
078     * An embedded certificate amendment.
079     * @since 13450
080     */
081    public static class EmbeddedCertAmend extends CertAmend {
082        private final String url;
083
084        EmbeddedCertAmend(String url, String filename, String sha256) {
085            super(filename, sha256);
086            this.url = Objects.requireNonNull(url);
087        }
088
089        /**
090         * Returns the embedded URL in JOSM jar.
091         * @return path for JOSM embedded certificate
092         */
093        public final String getUrl() {
094            return url;
095        }
096
097        @Override
098        public String toString() {
099            return url;
100        }
101    }
102
103    /**
104     * A certificate amendment relying on native platform certificate store.
105     * @since 13450
106     */
107    public static class NativeCertAmend extends CertAmend {
108        private final String winAlias;
109        private final String macAlias;
110        private final String httpsWebSite;
111
112        NativeCertAmend(String winAlias, String macAlias, String filename, String sha256, String httpsWebSite) {
113            super(filename, sha256);
114            this.winAlias = Objects.requireNonNull(winAlias);
115            this.macAlias = Objects.requireNonNull(macAlias);
116            this.httpsWebSite = Objects.requireNonNull(httpsWebSite);
117        }
118
119        /**
120         * Returns the Windows alias in System Root Certificates keystore.
121         * @return the Windows alias in System Root Certificates keystore
122         */
123        public final String getWinAlias() {
124            return winAlias;
125        }
126
127        /**
128         * Returns the macOS alias in System Root Certificates keychain.
129         * @return the macOS alias in System Root Certificates keychain
130         */
131        public final String getMacAlias() {
132            return macAlias;
133        }
134
135        /**
136         * Returns the https website we need to call to notify Windows we need its root certificate.
137         * @return the https website signed with this root CA
138         * @since 13451
139         */
140        public String getWebSite() {
141            return httpsWebSite;
142        }
143
144        @Override
145        public String toString() {
146            String result = winAlias;
147            if (!winAlias.equals(macAlias)) {
148                result += " / " + macAlias;
149            }
150            return result;
151        }
152    }
153
154    /**
155     * Certificates embedded in JOSM
156     */
157    private static final EmbeddedCertAmend[] CERT_AMEND = {
158    };
159
160    /**
161     * Certificates looked into platform native keystore and not embedded in JOSM.
162     * Identifiers must match Windows/macOS keystore aliases and Unix filenames for efficient search.
163     */
164    private static final NativeCertAmend[] PLATFORM_CERT_AMEND = {
165        // Let's Encrypt - should be included in JDK, but problems with Ubuntu 18.04, see #15851
166        new NativeCertAmend("DST Root CA X3", "DST Root CA X3",
167                "DST_Root_CA_X3.pem",
168                "0687260331a72403d909f105e69bcf0d32e1bd2493ffc6d9206d11bcd6770739",
169                "https://acme-v02.api.letsencrypt.org"),
170        // Government of Netherlands
171        new NativeCertAmend("Staat der Nederlanden Root CA - G2", "Staat der Nederlanden Root CA - G2",
172                "Staat_der_Nederlanden_Root_CA_-_G2.crt",
173                "668c83947da63b724bece1743c31a0e6aed0db8ec5b31be377bb784f91b6716f",
174                "https://roottest-g2.pkioverheid.nl"),
175        // Government of Netherlands
176        new NativeCertAmend("Government of Netherlands G3", "Staat der Nederlanden Root CA - G3",
177                "Staat_der_Nederlanden_Root_CA_-_G3.crt",
178                "3c4fb0b95ab8b30032f432b86f535fe172c185d0fd39865837cf36187fa6f428",
179                "https://roottest-g3.pkioverheid.nl"),
180        // Trusted and used by French Government - https://www.certigna.fr/autorites/index.xhtml?ac=Racine#lracine
181        new NativeCertAmend("Certigna", "Certigna", "Certigna.crt",
182                "e3b6a2db2ed7ce48842f7ac53241c7b71d54144bfb40c11f3f1d0b42f5eea12d",
183                "https://www.certigna.fr"),
184    };
185
186    private CertificateAmendment() {
187        // Hide default constructor for utility classes
188    }
189
190    /**
191     * Add missing root certificates to the list of trusted certificates for TLS connections.
192     * @throws IOException if an I/O error occurs
193     * @throws GeneralSecurityException if a security error occurs
194     */
195    public static void addMissingCertificates() throws IOException, GeneralSecurityException {
196        if (!Config.getPref().getBoolean("tls.add-missing-certificates", true))
197            return;
198        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
199        Path cacertsPath = Paths.get(Utils.getSystemProperty("java.home"), "lib", "security", "cacerts");
200        try (InputStream is = Files.newInputStream(cacertsPath)) {
201            keyStore.load(is, "changeit".toCharArray());
202        } catch (SecurityException e) {
203            Logging.log(Logging.LEVEL_ERROR, "Unable to load keystore", e);
204            return;
205        }
206
207        MessageDigest md = MessageDigest.getInstance("SHA-256");
208        CertificateFactory cf = CertificateFactory.getInstance("X.509");
209        boolean certificateAdded = false;
210        // Add embedded certificates. Exit in case of error
211        for (EmbeddedCertAmend certAmend : CERT_AMEND) {
212            try (CachedFile certCF = new CachedFile(certAmend.url)) {
213                X509Certificate cert = (X509Certificate) cf.generateCertificate(
214                        new ByteArrayInputStream(certCF.getByteContent()));
215                if (checkAndAddCertificate(md, cert, certAmend, keyStore)) {
216                    certificateAdded = true;
217                }
218            }
219        }
220
221        try {
222            // Try to add platform certificates. Do not exit in case of error (embedded certificates may be OK)
223            for (NativeCertAmend certAmend : PLATFORM_CERT_AMEND) {
224                X509Certificate cert = Main.platform.getX509Certificate(certAmend);
225                if (checkAndAddCertificate(md, cert, certAmend, keyStore)) {
226                    certificateAdded = true;
227                }
228            }
229        } catch (KeyStoreException | NoSuchAlgorithmException | CertificateException | IOException | IllegalStateException e) {
230            Logging.error(e);
231        }
232
233        if (certificateAdded) {
234            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
235            tmf.init(keyStore);
236            SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
237            sslContext.init(null, tmf.getTrustManagers(), null);
238            SSLContext.setDefault(sslContext);
239        }
240    }
241
242    private static boolean checkAndAddCertificate(MessageDigest md, X509Certificate cert, CertAmend certAmend, KeyStore keyStore)
243            throws CertificateEncodingException, KeyStoreException, InvalidAlgorithmParameterException {
244        if (cert != null) {
245            String sha256 = Utils.toHexString(md.digest(cert.getEncoded()));
246            if (!certAmend.sha256.equals(sha256)) {
247                throw new IllegalStateException(
248                        tr("Error adding certificate {0} - certificate fingerprint mismatch. Expected {1}, was {2}",
249                            certAmend, certAmend.sha256, sha256));
250            }
251            if (certificateIsMissing(keyStore, cert)) {
252                if (Logging.isDebugEnabled()) {
253                    Logging.debug(tr("Adding certificate for TLS connections: {0}", cert.getSubjectX500Principal().getName()));
254                }
255                String alias = "josm:" + certAmend.filename;
256                keyStore.setCertificateEntry(alias, cert);
257                return true;
258            }
259        }
260        return false;
261    }
262
263    /**
264     * Check if the certificate is missing and needs to be added to the keystore.
265     * @param keyStore the keystore
266     * @param crt the certificate
267     * @return true, if the certificate is not contained in the keystore
268     * @throws InvalidAlgorithmParameterException if the keystore does not contain at least one trusted certificate entry
269     * @throws KeyStoreException if the keystore has not been initialized
270     */
271    private static boolean certificateIsMissing(KeyStore keyStore, X509Certificate crt)
272            throws KeyStoreException, InvalidAlgorithmParameterException {
273        PKIXParameters params = new PKIXParameters(keyStore);
274        String id = crt.getSubjectX500Principal().getName();
275        for (TrustAnchor ta : params.getTrustAnchors()) {
276            X509Certificate cert = ta.getTrustedCert();
277            if (Objects.equals(id, cert.getSubjectX500Principal().getName()))
278                return false;
279        }
280        return true;
281    }
282}