问题
Our Java application exposes a lot of different interfaces (SMTP, FTP, HTTP), secured by SSL/TLS. The goal now is to limit cipher suites allowed on these interfaces to include only "strong" ones. I already have a list and it's clear how to make it working for a particular socket
socket.setEnabledCipherSuites(ENABLED_SECURE_CIPHER_SUITES);
or for Tomcat connector
<Connector port="443" ciphers="..."/>
The problem is that there are already 5 places in the application where I should apply this limitation manualy. Common SocketFactory does not seem to help, as it's not always feasible to supply custom SocketFactory to third-party API or framework. Is it possible to somehow introduce this limitation on JRE level, e.g. with JCE providers configuration or policy file?
JRE: Oracle JRE 1.7.0_17
回答1:
Well, I managed to get that working. Thanks to EJP for pointing in the right direction. Since Java 1.7 there are two additional properties in $JRE_HOME/lib/security/java.security:
jdk.certpath.disabledAlgorithms=MD2
Controls algorithms for certification path building and validation.
jdk.tls.disabledAlgorithms=MD5, SHA1, RC4, RSA keySize < 1024
JVM-wide algorithm restrictions for SSL/TLS processing, the one I was looking for. Notation is quite obvious here; it's possible to disallow certain algorithms or limit key sizes. Both properties are supported in Oracle JRE 7, Open JRE 7 and (surprisingly) IBM Java v7
来源：https://stackoverflow.com/questions/18589761/restrict-cipher-suites-on-jre-level