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How to use SSL with cloudhopper-smpp

The purpose of this document is to provide a summary of how to configuration SSL for ch-smpp servers and clients. The internal implementation uses Java Secure Sockets Extension (JSSE).

Configuring a SMPP server with SSL transport

Example:

// Configure the server as you normally would:
SmppServerConfiguration configuration = new SmppServerConfiguration();
configuration.setPort(2776);
...

// Then create a SSL configuration:
SslConfiguration sslConfig = new SslConfiguration();
sslConfig.setKeyStorePath("path/to/keystore");
sslConfig.setKeyStorePassword("changeit");
sslConfig.setKeyManagerPassword("changeit");
sslConfig.setTrustStorePath("path/to/keystore");
sslConfig.setTrustStorePassword("changeit");
...

// And add it to the server configuration:
configuration.setUseSsl(true);
configuration.setSslConfiguration(sslConfig);

Require client auth

sslConfig.setNeedClientAuth(true);

Configuring a SMPP client with SSL transport

Example:

// Configure the server as you normally would:
SmppSessionConfiguration configuration = new SmppSessionConfiguration();
configuration.setType(SmppBindType.TRANSCEIVER);
configuration.setHost("127.0.0.1");
configuration.setPort(2776);
...

// Then create a SSL configuration:
SslConfiguration sslConfig = new SslConfiguration();
// Which trusts all certs by default. You can turn this off with
// sslConfig.setTrustAll(false);
...

// And add it to the server configuration:
configuration.setSslConfiguration(sslConfig);
configuration.setUseSsl(true);

Validate certificates

sslConfig.setValidateCerts(true);
sslConfig.setValidatePeerCerts(true);

Generating key pairs and certificates

Generating Keys and Certificates with the JDK's keytool

keytool -keystore keystore -alias smpp -genkey -keyalg RSA

Generating Keys and Certificates with OpenSSL

openssl genrsa -des3 -out smpp.key
openssl req -new -x509 -key smpp.key -out smpp.crt

Requesting a trusted certificate

Generating a CSR from keytool

keytool -certreq -alias smpp -keystore keystore -file smpp.csr

Generating a CSR from OpenSSL

openssl req -new -key smpp.key -out smpp.csr

Loading keys and certificates

Loading Certificates with keytool

The following command loads a PEM encoded certificate in the smpp.crt file into a JSSE keystore:

keytool -keystore keystore -import -alias smpp -file smpp.crt -trustcacerts

Loading Keys and Certificates via PKCS12

If you have a key and certificate in separate files, you need to combine them into a PKCS12 format file to load into a new keystore. The certificate can be one you generated yourself or one returned from a CA in response to your CSR.

The following OpenSSL command combines the keys in smpp.key and the certificate in the smpp.crt file into the smpp.pkcs12 file.

openssl pkcs12 -inkey smpp.key -in smpp.crt -export -out smpp.pkcs12
keytool -importkeystore -srckeystore smpp.pkcs12 -srcstoretype PKCS12 -destkeystore keystore

Appendix

Interop with stunnel

This library has been tested with stunnel4 wrapping both client and servers. There is a sample stunnel.conf in src/test/resources that works with make server and make ssl-client. The SSL implementation should be compatible with other TLS/SSL encryption wrappers, assuming the JDK you are using supports the same cryptographic algorithms as the encryption wrapper.

Known issues