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Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead of .ima_mok [ver #2]

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On 16-03-08 16:07:00, David Howells wrote:
> Petko Manolov <petkan@mip-labs.com> wrote:
> 
> > > How about I change it to a choice-type item, with the following options:
> > > 
> > >  (1) No addition.
> > > 
> > >  (2) Addition restricted by built-in keyring.
> > > 
> > >  (3) Addition restricted by secondary keyring + built-in keyring.
> > > 
> > > where the second and third options then depend on the appropriate keyrings 
> > > being enabled.
> > 
> > I would suggest leaving (1) and (3).  Since secondary keyring only accepts
> > keys signed by certificate in the system keyring I think (2) is redundant.
> > It adds extra complexity (Kconfig is vague enough already) while it doesn't
> > increase the overall security by much.
> 
> If I remove option (2), that would mean that if you want to allow keys to be 
> added to .ima if they're signed by the built-in keyring, then you also allow 
> keys to be added to .ima if they're signed by the secondary keyring if 
> enabled.

Exactly.  The primary difference between the built-in and secondary keyring is 
that the latter is R/W.  Chances are the user want either no addition or need 
dynamic key add/remove.

I don't have strong opinions against (2).  This is more of a discussion whether 
we should sacrifice in favor of simplicity or flexibility.

> Remember - these keyrings aren't necessarily restricted to IMA.

I am well aware of that.  At some point (perhaps not now) i'd like to discuss 
allowing kernel module loading based on keys in the secondary keyring.  It is a 
niche feature for those machines that have uptime measured in years.  I 
certainly don't expect it to be something the regular desktop or embedded users 
need.

Another issue that we left unresolved is the system-wide blacklist keyring.  It 
is at the same hierarchy level as the secondary keyring and serves a similar 
purpose although in opposite direction.


		Petko

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[RFC PATCH 00/12] KEYS: Restrict additions to 'trusted' keyrings  [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 04/12] KEYS: Move x509_request_asymmetric_key() to  asymmetric_type.c [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead  of .ima_mok [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
    Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 03:30 +0100
      Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead of .ima_mok [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 14:10 +0100
        Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Petko Manolov <petkan@mip-labs.com> - 2016-03-08 15:20 +0100
          Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 15:40 +0100
          Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead of .ima_mok [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 15:50 +0100
            Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Petko Manolov <petkan@mip-labs.com> - 2016-03-08 16:50 +0100
          Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead of .ima_mok [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 17:10 +0100
            Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Petko Manolov <petkan@mip-labs.com> - 2016-03-08 17:40 +0100
              Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 23:10 +0100
        Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings  instead of .ima_mok [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 15:20 +0100
  [RFC PATCH 07/12] X.509: Move the trust validation code out to its  own file [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 11/12] certs: Add a secondary system keyring that can be  added to dynamically [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
    Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that  can be added to dynamically [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 03:10 +0100
      Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that can be added to dynamically [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 14:20 +0100
        Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that can  be added to dynamically [ver #2] Petko Manolov <petkan@mip-labs.com> - 2016-03-08 15:20 +0100
        Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that  can be added to dynamically [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 15:40 +0100
          Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that can be added to dynamically [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 15:50 +0100
            Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that  can be added to dynamically [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 16:10 +0100
              Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that can be added to dynamically [ver #2] David Howells <dhowells@redhat.com> - 2016-03-08 16:40 +0100
                Re: [RFC PATCH 11/12] certs: Add a secondary system keyring that  can be added to dynamically [ver #2] Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-03-08 17:20 +0100
  [RFC PATCH 05/12] KEYS: Generalise x509_request_asymmetric_key()  [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 09/12] KEYS: Move the point of trust determination to  __key_link() [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 02/12] PKCS#7: Make trust determination dependent on  contents of trust keyring [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 06/12] X.509: Use verify_signature() if we have a struct  key * to use [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100
  [RFC PATCH 10/12] KEYS: Remove KEY_FLAG_TRUSTED and  KEY_ALLOC_TRUSTED [ver #2] David Howells <dhowells@redhat.com> - 2016-03-04 16:10 +0100

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