linux-kernel - Re: [PATCH v2] crypto: AF_ALG - add support for keys/asymmetric-type

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Date:	Wed, 13 Jan 2016 13:31:22 +0000
From:	David Howells <dhowells@...hat.com>
To:	Tadeusz Struk <tstruk@...il.com>
Cc:	dhowells@...hat.com, herbert@...dor.apana.org.au,
	tadeusz.struk@...el.com, smueller@...onox.de,
	linux-api@...r.kernel.org, marcel@...tmann.org,
	linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
	linux-crypto@...r.kernel.org, zohar@...ux.vnet.ibm.com,
	dwmw2@...radead.org
Subject: Re: [PATCH v2] crypto: AF_ALG - add support for keys/asymmetric-type

Tadeusz Struk <tstruk@...il.com> wrote:

> +	pkey = keyring->payload.data[asym_crypto];
> +	if (!pkey) {
> +		key_put(keyring);
> +		goto out;
> +	}
> +
> +	err = setkey(private, pkey->key, pkey->keylen);
> +	key_put(keyring);

Note that you may not assume that there's data there that you can use in this
manner.  The key might be a pointer to some hardware device such as a TPM.  I
have a TPM asymmetric subtype in progress.

I think this really needs to be driven from a keyctl() because you need to let
the asymmetric subtype decide how it wants to handle this.  I would suggest
adding KEYCTL_{ASYM_GETINFO,SIGN,VERIFY,ENCRYPT,DECRYPT} - the problem is how
to pass sufficient arguments, how to decrypt the private key and what metadata
needs to be passed vs what is inline with the data.

David