[strongSwan-dev] Read private key with OpenSSL Engine

Ignacio Alamo Corsino

2017-08-09 14:27:21 UTC

Hello,

after some research, I think I can answer my own question in case anyone finds the same problem in the future.

The line that should be added in this case to ipsec.secrets is:

<leftipaddress> : PIN %smartcard:N "1234"

Being N the slot number of the smartcard and "pin1234" the pin code.

More info here: https://wiki.strongswan.org/projects/strongswan/wiki/PinSecret

After this step, I still had problems because when I wrote my engine, I didn't implement a PIN command.

This has to be added to your OpenSSL Engine implementation.

As an example, one can take a look to the implementation of the OpenSSL dynamic engine:

https://github.com/openssl/openssl/blob/master/crypto/engine/eng_dyn.c

Now the key is loaded and everything works fine.

Hope this helps anyone.

Best regards,

Ignacio

________________________________
De: Dev <dev-***@lists.strongswan.org> en nombre de Ignacio Alamo Corsino <***@hotmail.com>
Enviado: lunes, 7 de agosto de 2017 15:55
Para: ***@lists.strongswan.org
Asunto: [strongSwan-dev] Read private key with OpenSSL Engine

Hello,

I have written an OpenSSL engine to communicate with my smartcard (no pkcs#11 involved).

This engine loads some private key information from the smartcard (n,e) and also performs private key operations like signing.

The private key is normally loaded with the ENGINE_load_private_key OpenSSL function.

The problem that I have is that I don't know how to tell strongSwan to load the private key information using my engine in ipsec.secrets,

so I always end up with an "no private key found for 'Cert_XXXXXX'" error.

I am aware that I should use the openssl plugin but I don't know how to apply it to this case.

Thanks for your time.

Regards,

Ignacio