On 7.4.2016 12:13, Christian Heimes wrote:
On 2016-04-07 11:09, Petr Spacek wrote:
On 7.4.2016 08:43, Fraser Tweedale wrote:
Hi team,

I updated the Sub-CAs design page with more detail for the key
replication[1].  This part of the design is nearly complete (a large
patchset is in review over at pki-devel@) but there are various
options about how to authenticate to Custodia.

[1] http://www.freeipa.org/page/V4/Sub-CAs#Key_replication

In brief, the options are:

1) authenticate as host principal; install binary setuid
    root:pkiuser to read host keytab and custodia keys.

Huh, I really do not like this. Host keytab on IPA master is one of the most
sensitive keys we have.

Maybe gssproxy can be used somehow, but I think it would be better to use
separate key.

2) authenticate as host principal; copy host keytab and custodia
    keys to location readable by pkiuser.

No, really, do not copy host keytab anywhere.

3) create new principal for pkiuser to use, along with custodia keys
    and keytab in location readable by pkiuser.

I prefer option (1) for reasons outlined in the design page.  The
design page goes into quite a bit more detail so please review the
section linked above and get back to me with your thoughts.

The only downside of (3) using new keys is:
... This approach requires the creation of new principals, and Kerberos
keytabs and Custodia keys for those principals, as part of the
installation/upgrade process.

Compared with additional SUID binary this seems as safer and easier way to go.
FreeIPA installers already create quite a lot of principals and keytabs so
this is well understood task.

I would do (3).

+1 for (3)

A SUID binary feels like a dangerous hack.


Jan Cholasta

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