Android平台实现https信任所有证书的方法
Android平台上经常有使用https的需求,对于https服务器使用的根证书是受信任的证书的话,实现https是非常简单的,直接用httpclient库就行了,与使用http几乎没有区别。但是在大多数情况下,服务器所使用的根证书是自签名的,或者签名机构不在设备的信任证书列表中,这样使用httpclient进行https连接就会失败。解决这个问题的办法有两种,一是在发起https连接之前将服务器证书加到httpclient的信任证书列表中,这个相对来说比较复杂一些,很容易出错;另一种办法是让httpclient信任所有的服务器证书,这种办法相对来说简单很多,但安全性则差一些,但在某些场合下有一定的应用场景。这里要举例说明的就是后一种方法:实例化HttpClinet对象时要进行一些处理主要是绑定https连接所使用的端口号,这里绑定了443和8443:
- SchemeRegistry
schemeRegistry = new SchemeRegistry(); - schemeRegistry.register(new
Scheme("https", -
new EasySSLSocketFactory(), 443)); - schemeRegistry.register(new
Scheme("https", -
new EasySSLSocketFactory(), 8443)); - ClientConnectionManager
connManager = new ThreadSafeClientConnMana ger(params, schemeRegistry); - HttpClient
httpClient = new DefaultHttpClient(connManager, params);
上面的EasySSLSocketFactory类是我们自定义的,主要目的就是让httpclient接受所有的服务器证书,能够正常的进行https数据读取。相关代码如下:
- public
class EasySSLSocketFactory implements SocketFactory, -
LayeredSocketFactory { -
-
private SSLContext sslcontext = null; -
-
private static SSLContext createEasySSLContext() throws IOException { -
try { -
SSLContext context = SSLContext.getInstance("TLS"); -
context.init(null, new TrustManager[] { new EasyX509TrustManager( -
null) }, null); -
return context; -
} catch (Exception e) { -
throw new IOException(e.getMessage()); -
} -
} -
-
private SSLContext getSSLContext() throws IOException { -
if (this.sslcontext == null) { -
this.sslcontext = createEasySSLContext(); -
} -
return this.sslcontext; -
} -
-
-
public Socket connectSocket(Socket sock, String host, int port, -
InetAddress localAddress, int localPort, HttpParams params) -
throws IOException, UnknownHostException, ConnectTimeoutException { -
int connTimeout = HttpConnectionParams.getConnectionTimeout(params); -
int soTimeout = HttpConnectionParams.getSoTimeout(params); -
-
InetSocketAddress remoteAddress = new InetSocketAddress(host, port); -
SSLSocket sslsock = (SSLSocket) ((sock != null) ? sock : createSocket()); -
-
if ((localAddress != null) || (localPort > 0)) { -
// we need to bind explicitly -
if (localPort < 0) { -
localPort = 0; // indicates "any" -
} -
InetSocketAddress isa = new InetSocketAddress(localAddress, -
localPort); -
sslsock.bind(isa); -
} -
-
sslsock.connect(remoteAddress, connTimeout); -
sslsock.setSoTimeout(soTimeout); -
return sslsock; -
-
} -
-
-
public Socket createSocket() throws IOException { -
return getSSLContext().getSocketFactory().createSocket(); -
} -
-
-
public boolean isSecure(Socket socket) throws IllegalArgumentException { -
return true; -
} -
-
-
public Socket createSocket(Socket socket, String host, int port, -
boolean autoClose) throws IOException, UnknownHostException { -
return getSSLContext().getSocketFactory().createSocket(socket, host, -
port, autoClose); -
} -
-
// ------------------------------------------------------------------- -
// javadoc in org.apache.http.conn.scheme.SocketFactory says : -
// Both Object.equals() and Object.hashCode() must be overridden -
// for the correct operation of some connection managers -
// ------------------------------------------------------------------- -
-
public boolean equals(Object obj) { -
return ((obj != null) && obj.getClass().equals( -
EasySSLSocketFactory.class)); -
} -
-
public int hashCode() { -
return EasySSLSocketFactory.class.hashCode(); -
} - }
-
- public
class EasyX509TrustManager implements X509TrustManager { -
-
private X509TrustManager standardTrustManager = null; -
-
-
public EasyX509TrustManager(KeyStore keystore) -
throws NoSuchAlgorithmException , KeyStoreException { -
super(); -
TrustManagerFactory factory = TrustManagerFactory -
.getInstance(TrustManagerFactory.getDefaultAlgorithm()); -
factory.init(keystore); -
TrustManager[] trustmanagers = factory.getTrustManagers(); -
if (trustmanagers.length == 0) { -
throw new NoSuchAlgorithmException ("no trust manager found"); -
} -
this.standardTrustManager = (X509TrustManager) trustmanagers[0]; -
} -
-
-
public void checkClientTrusted(X509Certificate[] certificates, -
String authType) throws CertificateException { -
standardTrustManager.checkClientTrusted(certificates, authType); -
} -
-
-
public void checkServerTrusted(X509Certificate[] certificates, -
String authType) throws CertificateException { -
if ((certificates != null) && (certificates.length == 1)) { -
certificates[0].checkValidity(); -
} else { -
standardTrustManager.checkServerTrusted(certificates, authType); -
} -
} -
-
-
public X509Certificate[] getAcceptedIssuers() { -
return this.standardTrustManager.getAcceptedIssuers(); -
} - }