1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.security.net.config;
18
19import android.util.ArraySet;
20import java.security.KeyStore;
21import java.security.KeyStoreException;
22import java.security.cert.Certificate;
23import java.security.cert.X509Certificate;
24import java.util.Collections;
25import java.util.Enumeration;
26import java.util.Set;
27
28import com.android.org.conscrypt.TrustedCertificateIndex;
29
30/**
31 * {@link CertificateSource} which provides certificates from trusted certificate entries of a
32 * {@link KeyStore}.
33 */
34class KeyStoreCertificateSource implements CertificateSource {
35    private final Object mLock = new Object();
36    private final KeyStore mKeyStore;
37    private TrustedCertificateIndex mIndex;
38    private Set<X509Certificate> mCertificates;
39
40    public KeyStoreCertificateSource(KeyStore ks) {
41        mKeyStore = ks;
42    }
43
44    @Override
45    public Set<X509Certificate> getCertificates() {
46        ensureInitialized();
47        return mCertificates;
48    }
49
50    private void ensureInitialized() {
51        synchronized (mLock) {
52            if (mCertificates != null) {
53                return;
54            }
55
56            try {
57                TrustedCertificateIndex localIndex = new TrustedCertificateIndex();
58                Set<X509Certificate> certificates = new ArraySet<>(mKeyStore.size());
59                for (Enumeration<String> en = mKeyStore.aliases(); en.hasMoreElements();) {
60                    String alias = en.nextElement();
61                    X509Certificate cert = (X509Certificate) mKeyStore.getCertificate(alias);
62                    if (cert != null) {
63                        certificates.add(cert);
64                        localIndex.index(cert);
65                    }
66                }
67                mIndex = localIndex;
68                mCertificates = certificates;
69            } catch (KeyStoreException e) {
70                throw new RuntimeException("Failed to load certificates from KeyStore", e);
71            }
72        }
73    }
74
75    @Override
76    public X509Certificate findBySubjectAndPublicKey(X509Certificate cert) {
77        ensureInitialized();
78        java.security.cert.TrustAnchor anchor = mIndex.findBySubjectAndPublicKey(cert);
79        if (anchor == null) {
80            return null;
81        }
82        return anchor.getTrustedCert();
83    }
84
85    @Override
86    public X509Certificate findByIssuerAndSignature(X509Certificate cert) {
87        ensureInitialized();
88        java.security.cert.TrustAnchor anchor = mIndex.findByIssuerAndSignature(cert);
89        if (anchor == null) {
90            return null;
91        }
92        return anchor.getTrustedCert();
93    }
94
95    @Override
96    public Set<X509Certificate> findAllByIssuerAndSignature(X509Certificate cert) {
97        ensureInitialized();
98        Set<java.security.cert.TrustAnchor> anchors = mIndex.findAllByIssuerAndSignature(cert);
99        if (anchors.isEmpty()) {
100            return Collections.<X509Certificate>emptySet();
101        }
102        Set<X509Certificate> certs = new ArraySet<X509Certificate>(anchors.size());
103        for (java.security.cert.TrustAnchor anchor : anchors) {
104            certs.add(anchor.getTrustedCert());
105        }
106        return certs;
107    }
108
109    @Override
110    public void handleTrustStorageUpdate() {
111        // Nothing to do.
112    }
113}
114