OpenSSL::PKey::RSA.new without password results in terminal input failure

[djberg96]

Environment

JRuby 9.2.5.0 on a Mac via rbenv:

jruby 9.2.5.0 (2.5.0) 2018-12-06 6d5a228 Java HotSpot(TM) 64-Bit Server VM 9.0.4+11 on 9.0.4+11 +jit [darwin-x86_64]

Darwin Daniels-iMac.attlocal.net 18.2.0 Darwin Kernel Version 18.2.0: Mon Nov 12 20:24:46 PST 2018; root:xnu-4903.231.4~2/RELEASE_X86_64 x86_64

I've also seen the same behavior on Linux, and with previous versions of JRuby.

Expected Behavior

When providing a key without a password, it should prompt the user to enter one with "Enter PEM pass phrase". This it does. The user should then be able to type in a password without characters appearing on the screen, and be accepted once the user presses the Enter key.

Actual Behavior

It has two problems. First, when typing, the text is visible. Second, it doesn't appear to accept an "Enter" key, instead I see "^M" characters.

You can reproduce this like so:

require 'openssl'
key = File.join(Dir.home, '.ssh', 'gem-private_key.pem')
OpenSSL::PKey::RSA.new(File.read(key))

At that point you'll be prompted to enter your password and you will see the behavior.

[djberg96]

@headius Any thoughts on this?

[djberg96]

Still happening as of 9.2.12.0 9.3.4.0

[djberg96]

Still happening as of 9.3.8.0.

[headius]

Poking at this a bit today. Not sure where this prompt is coming from but it's not in any of the JRuby or related library sources.

[headius]

Oops found it!

https://github.com/jruby/jruby-openssl/blob/a7994b3ba17db9a49f0ef4b64bfc8df2a88e7bc9/src/main/java/org/jruby/ext/openssl/PKey.java#L404-L406

My guess is that this is not using the right kind of logic to receive the password, being that it is quite old. Digging further.

[headius]

Ok, so the C extension uses OpenSSL's EVP_read_pw_string_min function to prompt for the password:

https://man.openbsd.org/EVP_read_pw_string_min.3

We can use something similar via io/console getpass, but that would introduce a dependency from jruby-openssl to io-console:

https://www.devdungeon.com/content/get-password-console-ruby

And we have our logic implemented in Java, so this would additionally require a call-out to Ruby. I'm looking for a JDK-only solution

[headius]

I pushed jruby/jruby-openssl#270 to use java.io.Console to prompt for password. Seems to work locally, doing a mvn package in jruby-openssl and then installing pkg/jruby-openssl-xxxxx.gem and running your script.

cc @kares

[djberg96]

Thanks!