security - TLS to secure external client server application -


is possible use transaction layer security (tls) secure external client/server application without modifying code of application itself?

say client application on machine connects several servers on several machines on unsecured connection. want encrypt connection using openssl/tls, can't modify neither client nor servers, machine configurations (linux os running underneath). found stunnel seems supports 1:1 connection.

thanks in advance.

if have finite (and reasonably small) number of servers , can configure port number on client each connection, run stunnel on multiple ports, each 1 corresponding different destination.

however, sounds setting vpn between these machines better option. vpn implementations rely on tls, i'm not sure best choice here. might want investigate other methods, such ipsec too.


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