linux-kernel - Re: [PATCH 3/4] KEYS: CA link restriction

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Message-ID: <e2dd58cd6074ae692256333b43b5ecde70bcdbdd.camel@linux.ibm.com>
Date:   Mon, 07 Mar 2022 18:01:43 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>,
        Stefan Berger <stefanb@...ux.ibm.com>
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        "nayna@...ux.ibm.com" <nayna@...ux.ibm.com>,
        "mic@...ux.microsoft.com" <mic@...ux.microsoft.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 3/4] KEYS: CA link restriction

On Mon, 2022-03-07 at 18:06 +0000, Eric Snowberg wrote:
> 
> >> diff --git a/crypto/asymmetric_keys/restrict.c b/crypto/asymmetric_keys/restrict.c
> >> index 6b1ac5f5896a..49bb2ea7f609 100644
> >> --- a/crypto/asymmetric_keys/restrict.c
> >> +++ b/crypto/asymmetric_keys/restrict.c
> >> @@ -108,6 +108,49 @@ int restrict_link_by_signature(struct key *dest_keyring,
> >>  	return ret;
> >>  }
> >>  +/**
> >> + * restrict_link_by_ca - Restrict additions to a ring of CA keys
> >> + * @dest_keyring: Keyring being linked to.
> >> + * @type: The type of key being added.
> >> + * @payload: The payload of the new key.
> >> + * @trust_keyring: Unused.
> >> + *
> >> + * Check if the new certificate is a CA. If it is a CA, then mark the new
> >> + * certificate as being ok to link.
> > 
> > CA = root CA here, right?
> 
> Yes, I’ll update the comment

Updating the comment is not enough.  There's an existing function named
"x509_check_for_self_signed()" which determines whether the certificate
is self-signed.

thanks,

Mimi