Re: How to add additional blacklist entries?

From	David Howells <dhowells@redhat.com>
Newsgroups	linux.kernel
Subject	Re: How to add additional blacklist entries?
Date	2016-02-09 11:50 +0100
Message-ID	<r0e1S-2PZ-47@gated-at.bofh.it> (permalink)
References	(7 earlier) <qY7xw-3G4-7@gated-at.bofh.it> <qZUwa-63L-17@gated-at.bofh.it> <qZWok-7it-59@gated-at.bofh.it> <qZXaH-7Ql-59@gated-at.bofh.it> <qZZFw-1eh-5@gated-at.bofh.it>
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Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:

> > You can link from any key you have LINK permission on.  Further, add_key()
> > can add directly.
> 
> Oh, for some reason I thought the system blacklist keyring was limited
> to the new key type with just a description.   I was able to add, but
> also remove a key from the system blacklist.   I guess the KEY_FLAG_KEEP
> is not set on the system blacklist.

With patch 18 you can.  Prior to that it's not possible to modify it from
userspace at all.

> The keys being added to the IMA keyring are signed x509 certs (eg.
> openssl ca -ss_cert).  It would be nice to be able to include the skid
> in the description, without a payload, and sign that.  I have no idea if
> that Is possible or if it makes sense.  I'm open to suggestions.

I think we need a new keyctl or syscall for this.

We need to run through the X.509 parser, but we don't actually want to keep
any of the payload - and, in fact, we don't even necessarily want to create an
asymmetric-type key, though it's not a complete loss if we do that and create
one with a blacklist subtype.  The blacklist subtype would just return an
error from all operation points, but would otherwise be handled as normal.

David

Thread

Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] David Howells <dhowells@redhat.com> - 2016-02-03 16:30 +0100
  Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-08 14:40 +0100
    Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] David Howells <dhowells@redhat.com> - 2016-02-08 15:00 +0100
      Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-08 16:10 +0100
        How to add additional blacklist entries? David Howells <dhowells@redhat.com> - 2016-02-08 17:00 +0100
          Re: How to add additional blacklist entries? Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-08 17:40 +0100
            Re: How to add additional blacklist entries? David Howells <dhowells@redhat.com> - 2016-02-08 17:50 +0100
              Re: How to add additional blacklist entries? Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-08 20:30 +0100
                Re: How to add additional blacklist entries? David Howells <dhowells@redhat.com> - 2016-02-09 11:50 +0100
                Re: How to add additional blacklist entries? Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-10 15:10 +0100
    Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] David Howells <dhowells@redhat.com> - 2016-02-08 16:00 +0100
      Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-02-08 17:50 +0100
        Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2] David Howells <dhowells@redhat.com> - 2016-02-19 12:50 +0100

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