如果有人需要答案，我在google 2天后终于找到了答案。基本上我们需要使用自定义的 TrustManager 来信任 KeyStore 中的 CA，这是因为在 Android 2.3.x 中，没有正确使用密钥库。归功于 CustomTrustManager 的 https://github.com/delgurth。
请参考：https://github.com/ikust/hello-pinnedcerts/issues/2
KeyPinStore.java
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
public class KeyPinStore {
private static final String[] certificates = {"certificate1.crt", "certificate2.crt", "certificate3.crt", "certificate4.crt"};
private static KeyPinStore instance = null;
private SSLContext sslContext = SSLContext.getInstance("TLS");
public static synchronized KeyPinStore getInstance() throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
if (instance == null) {
instance = new KeyPinStore();
}
return instance;
}
private KeyPinStore() throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
for (int i = 0; i < certificates.length; i++) {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
InputStream caInput = new BufferedInputStream(Application.context.getAssets().open("certificate/" + certificates[i]));
Certificate ca;
try {
ca = cf.generateCertificate(caInput);
System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());
} finally {
caInput.close();
}
// Create a KeyStore containing our trusted CAs
keyStore.setCertificateEntry("ca" + i, ca);
}
// Use custom trust manager to trusts the CAs in our KeyStore
TrustManager[] trustManagers = {new CustomTrustManager(keyStore)};
// Create an SSLContext that uses our TrustManager
// SSLContext context = SSLContext.getInstance("TLS");
sslContext.init(null, trustManagers, null);
}
public SSLContext getContext() {
return sslContext;
}
}
CustomTrustManager.java
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.Principal;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.List;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
/**
* A custom X509TrustManager implementation that trusts a specified server certificate in addition
* to those that are in the system TrustStore.
* Also handles an out-of-order certificate chain, as is often produced by Apache's mod_ssl
*/
public class CustomTrustManager implements X509TrustManager {
private final TrustManager[] originalTrustManagers;
private final KeyStore trustStore;
/**
* @param trustStore A KeyStore containing the server certificate that should be trusted
* @throws NoSuchAlgorithmException
* @throws KeyStoreException
*/
public CustomTrustManager(KeyStore trustStore) throws NoSuchAlgorithmException, KeyStoreException {
this.trustStore = trustStore;
final TrustManagerFactory originalTrustManagerFactory = TrustManagerFactory.getInstance("X509");
originalTrustManagerFactory.init(trustStore);
originalTrustManagers = originalTrustManagerFactory.getTrustManagers();
}
/**
* No-op. Never invoked by client, only used in server-side implementations
* @return
*/
public X509Certificate[] getAcceptedIssuers() {
return new X509Certificate[0];
}
/**
* No-op. Never invoked by client, only used in server-side implementations
* @return
*/
public void checkClientTrusted(X509Certificate[] chain, String authType) throws java.security.cert.CertificateException {
}
/**
* Given the partial or complete certificate chain provided by the peer,
* build a certificate path to a trusted root and return if it can be validated and is trusted
* for client SSL authentication based on the authentication type. The authentication type is
* determined by the actual certificate used. For instance, if RSAPublicKey is used, the authType should be "RSA".
* Checking is case-sensitive.
* Defers to the default trust manager first, checks the cert supplied in the ctor if that fails.
* @param chain the server's certificate chain
* @param authType the authentication type based on the client certificate
* @throws java.security.cert.CertificateException
*/
public void checkServerTrusted(X509Certificate[] chain, String authType) throws java.security.cert.CertificateException {
try {
for (TrustManager originalTrustManager : originalTrustManagers) {
((X509TrustManager) originalTrustManager).checkServerTrusted(chain, authType);
}
} catch(CertificateException originalException) {
try {
// Ordering issue?
X509Certificate[] reorderedChain = reorderCertificateChain(chain);
if (! Arrays.equals(chain, reorderedChain)) {
checkServerTrusted(reorderedChain, authType);
return;
}
for (int i = 0; i < chain.length; i++) {
if (validateCert(reorderedChain[i])) {
return;
}
}
throw originalException;
} catch(Exception ex) {
ex.printStackTrace();
throw originalException;
}
}
}
/**
* Checks if we have added the certificate in the trustStore, if that's the case we trust the certificate
* @param x509Certificate the certificate to check
* @return true if we know the certificate, false otherwise
* @throws KeyStoreException on problems accessing the key store
*/
private boolean validateCert(final X509Certificate x509Certificate) throws KeyStoreException {
return trustStore.getCertificateAlias(x509Certificate) != null;
}
/**
* Puts the certificate chain in the proper order, to deal with out-of-order
* certificate chains as are sometimes produced by Apache's mod_ssl
* @param chain the certificate chain, possibly with bad ordering
* @return the re-ordered certificate chain
*/
private X509Certificate[] reorderCertificateChain(X509Certificate[] chain) {
X509Certificate[] reorderedChain = new X509Certificate[chain.length];
List<X509Certificate> certificates = Arrays.asList(chain);
int position = chain.length - 1;
X509Certificate rootCert = findRootCert(certificates);
reorderedChain[position] = rootCert;
X509Certificate cert = rootCert;
while((cert = findSignedCert(cert, certificates)) != null && position > 0) {
reorderedChain[--position] = cert;
}
return reorderedChain;
}
/**
* A helper method for certificate re-ordering.
* Finds the root certificate in a possibly out-of-order certificate chain.
* @param certificates the certificate change, possibly out-of-order
* @return the root certificate, if any, that was found in the list of certificates
*/
private X509Certificate findRootCert(List<X509Certificate> certificates) {
X509Certificate rootCert = null;
for(X509Certificate cert : certificates) {
X509Certificate signer = findSigner(cert, certificates);
if(signer == null || signer.equals(cert)) { // no signer present, or self-signed
rootCert = cert;
break;
}
}
return rootCert;
}
/**
* A helper method for certificate re-ordering.
* Finds the first certificate in the list of certificates that is signed by the sigingCert.
*/
private X509Certificate findSignedCert(X509Certificate signingCert, List<X509Certificate> certificates) {
X509Certificate signed = null;
for(X509Certificate cert : certificates) {
Principal signingCertSubjectDN = signingCert.getSubjectDN();
Principal certIssuerDN = cert.getIssuerDN();
if(certIssuerDN.equals(signingCertSubjectDN) && !cert.equals(signingCert)) {
signed = cert;
break;
}
}
return signed;
}
/**
* A helper method for certificate re-ordering.
* Finds the certificate in the list of certificates that signed the signedCert.
*/
private X509Certificate findSigner(X509Certificate signedCert, List<X509Certificate> certificates) {
X509Certificate signer = null;
for(X509Certificate cert : certificates) {
Principal certSubjectDN = cert.getSubjectDN();
Principal issuerDN = signedCert.getIssuerDN();
if(certSubjectDN.equals(issuerDN)) {
signer = cert;
break;
}
}
return signer;
}
}
要使用它，只需获取 SSLSocketFactory 并应用它，例如：
使用 HttpsURLConnection
KeyPinStore keystore = KeyPinStore.getInstance();
SSLSocketFactory sslSF = keystore.getContext().getSocketFactory();
URL url = new URL("https://certs.cac.washington.edu/CAtest/");
HttpsURLConnection urlConnection = (HttpsURLConnection)url.openConnection();
urlConnection.setSSLSocketFactory(sslSF);
InputStream in = urlConnection.getInputStream();
copyInputStreamToOutputStream(in, System.out);
齐射
KeyPinStore keystore = KeyPinStore.getInstance();
SSLSocketFactory sslSF = keystore.getContext().getSocketFactory();
RequestQueue mRequestQueue = Volley.newRequestQueue(context, new HurlStack(null, sslSF));