security/tlswrapper 20230101 NetBSD

tlswrapper is an TLS encryption wrapper between remote client and local program prog. Systemd.socket/inetd/tcpserver/... creates the server connection, tlswrapper encrypts/decrypts data stream and reads/writes data from/to the program prog as follows:

Internet <--> systemd.socket/inetd/tcpserver/... <--> tlswrapper <--> prog

By running separate instance of tlswrapper for each TLS connection, a vulnerability in the code (e.g. bug in the TLS library) can't be used to compromise the memory of another connection.

To protect against secret-information leaks to the network connection (such Heartbleed) tlswrapper runs two independent processes for every TLS connection. One process holds secret-keys and runs secret-keys operations and second talks to the network. Processes communicate with each other through UNIX pipes.