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I am a Java developer that is building an app where it needs to call a C# process from within. In my situation, the Java app is calling this C# program https://github.com/nddipiazza/SharepointOnlineCookieFetcher.

This C# program requires a password. It accepts a stdin password (masked using SecureInput) or it can take password as an environment variable.

I am wondering... in this situation... what is more secure and why?

1) Sending the password using the stdin?

or

2) Set the environment variable SPPWD=thepassword and call the program?

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Neither. Both ways of providing the password can be bypassed (rather trivially) in the same way (replacing the target executable with your own or checking the child process state at runtime).

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