About Securing Connections
IG is often deployed to replay credentials or other security information. In a real world deployment, that information must be communicated over a secure connection using HTTPS, meaning in effect HTTP over encrypted Transport Layer Security (TLS). Never send real credentials, bearer tokens, or other security information unprotected over HTTP.
When IG is running in web container mode, and acting as a server, the TLS connection is configured in the container. When IG is running in standalone mode, and acting as a server, the TLS connection is configured in admin.json.
When IG is acting as a client, the TLS connection is configured in the ReverseProxyHandler. For details, see "Configuring IG For HTTPS (Client-Side)" and "ReverseProxyHandler".
TLS depends on the use of digital certificates (public keys). In typical use of TLS, the client authenticates the server by its X.509 digital certificate as the first step to establishing communication. Once trust is established, then the client and server can set up a symmetric key to encrypt communications.
In order for the client to trust the server certificate, the client needs first to trust the certificate of the party who signed the server's certificate. This means that either the client has a trusted copy of the signer's certificate, or the client has a trusted copy of the certificate of the party who signed the signer's certificate.
Certificate Authorities (CAs) are trusted signers with well-known certificates. Browsers generally ship with many well-known CA certificates. Java distributions also ship with many well-known CA certificates. Getting a certificate signed by a well-known CA is often expensive.
It is also possible for you to self-sign certificates. The trade-off is that although there is no monetary expense, the certificate is not trusted by any clients until they have a copy. Whereas it is often enough to install a certificate signed by a well-known CA in the server keystore as the basis of trust for HTTPS connections, self-signed certificates must also be installed in all clients.
Like self-signed certificates, the signing certificates of less well-known CAs are also unlikely to be found in the default truststore. You might therefore need to install those signing certificates on the client-side as well.
This guide describes how to install self-signed certificates, that are suitable for trying out the software, or for deployments where you manage all clients that access IG. For information about how to use well-known CA-signed certificates, see the documentation for the Java Virtual Machine (JVM).
After certificates are properly installed to allow client-server trust, consider the cipher suites configured for use. The cipher suite determines the security settings for the communication. Initial TLS negotiations bring the client and server to agreement on which cipher suite to use. Basically the client and server share their preferred cipher suites to compare and to choose. If you therefore have a preference concerning the cipher suites to use, you must set up your deployment to use only your preferred cipher suites. IG inherits the list of cipher suites from the underlying Java environment.
The Java Secure Socket Extension (JSSE), part of the Java environment, provides security services that IG uses to secure connections. You can set security and system properties to configure the JSSE. For a list of properties you can use to customize the JSSE in Oracle Java, see the Customization section of the JSSE Reference Guide.