I searched for an answer but i did not find any. I am programming a FTP Synchronization tool for Android, i want to provide the following server types: - FTP -> Works - SFTP -> Works - FTPS -> Does not work anymore
I use the apache commons net library, at the beginning in version 2.2 now i checked 3.0.1 and also 3.1 snapshopt but the problem is not gone.
The Error message:
W/System.err( 433): javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x2672b0: Failure in SSL library, usually a protocol error
W/System.err( 433): error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol (external/openssl/ssl/s23_srvr.c:589 0xad12959f:0x00000000)
W/System.err( 433): at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
W/System.err( 433): at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:474)
W/System.err( 433): at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:328)
W/System.err( 433): at org.apache.commons.net.ftp.FTPSClient.sslNegotiation(FTPSClient.java:259)
W/System.err( 433): at org.apache.commons.net.ftp.FTPSClient._connectAction_(FTPSClient.java:200)
W/System.err( 433): at org.apache.commons.net.SocketClient.connect(SocketClient.java:169)
W/System.err( 433): at org.apache.commons.net.SocketClient.connect(SocketClient.java:189)
W/System.err( 433): at com.syncoorp.FTPSyncX_Pro.server.FTPSServer.remoteConnect(FTPSServer.java:87)
i dont know what i can do now, to solve this problem and i do not want to tell my customer that they can only use FTPS on android < 2.3
my code to connect is:
client = new FTPSClient(implictSSL);
KeyManagerFactory kmf = KeyManagerFactory.getInstance("X509");
kmf.init(KeyStore.getInstance("BKS"), "wshr.ut".toCharArray());
client.setTrustManager(new X509TrustManager() {
public X509Certificate[] getAcceptedIssuers() { return null; }
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { }
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { }
});
client.setKeyManager(kmf.getKeyManagers()[0]);
client.setNeedClientAuth(false);
client.setUseClientMode(false);
if(timeout > 0) {
client.setConnectTimeout(timeout);
client.setDataTimeout(timeout);
client.setDefaultTimeout(timeout);
}
client.connect(values.host, values.port);
Does anybody know something how to fix it or have a workaround?
best regards, PrDatur
