Jamie Strandboge <jamie@xxxxxxxxxxxxx> writes:
> On Thu, 14 Nov 2019, Cole Robinson wrote:
>
>> On 10/24/19 4:57 AM, Arnaud Patard wrote:
>> > When emulating smartcard with host certificates, qemu needs to
>> > be able to read the certificates files, which is denied by apparmor.
>> > Add necessary code to add the smartcard certificates related directory
>> > to the apparmor profile.
>> >
>> > This code supports only this case smartcard 'host' and 'passthrough'
>> > settings are not supported, as I can't test them.
>> >
>> > Signed-off-by: Arnaud Patard <apatard@xxxxxxxxxxxxx>
>> > Index: libvirt-5.0.0/src/security/virt-aa-helper.c
>> > ===================================================================
>> > --- libvirt-5.0.0.orig/src/security/virt-aa-helper.c
>> > +++ libvirt-5.0.0/src/security/virt-aa-helper.c
>> > @@ -1251,6 +1251,26 @@ get_files(vahControl * ctl)
>> > }
>> > }
>> >
>> > + for (i = 0; i < ctl->def->nsmartcards; i++) {
>> > + virDomainSmartcardDefPtr sc = ctl->def->smartcards[i];
>> > + virDomainSmartcardType sc_type = sc->type;
>> > + char *sc_db = (char *)VIR_DOMAIN_SMARTCARD_DEFAULT_DATABASE;
>> > + if (sc->data.cert.database)
>> > + sc_db = sc->data.cert.database;
>> > + switch(sc_type) {
>>
>> Add a space after 'switch'. 'make syntax-check' will catch this. libvirt
>> style is typically to not indent the 'case' keyword either, but this
>> file is inconsistent on that front. With those fixed:
>>
>> Reviewed-by: Cole Robinson <crobinso@xxxxxxxxxx>
>>
>> This matches what is done for the selinux driver AFAICT
>>
>> CCing apparmor maintainers, I'll defer to them to commit
>>
>> - Cole
>>
>> > + case VIR_DOMAIN_SMARTCARD_TYPE_HOST:
>> > + break;
>> > + case VIR_DOMAIN_SMARTCARD_TYPE_HOST_CERTIFICATES:
>> > + virBufferAsprintf(&buf, " \"%s/\" rk,\n", sc_db);
>> > + virBufferAsprintf(&buf, " \"%s/*\" rk,\n", sc_db);
>> > + break;
>
> I'll let other comment on the code changes, but these rules look ok. I
> might suggest using this one line instead:
>
> virBufferAsprintf(&buf, " \"%s/{,*}" rk,\n", sc_db);
>
Ok, will update my patch to use this.
> Is it possible that the certificates might be in a lower directory? Ie,
> is '**' warranted?
>
In the case of host certificates, the database parameter corresponds to
a NSS db directory, for instance:
$ ls <database directory>/
cert9.db key4.db pkcs11.txt
The certificate are in the db files and the name given in the xml are
the names of the certificates in the db:
$ certutil -L -d sql:<database directory>
Certificate Nickname Trust
Attributes
SSL,S/MIME,JAR/XPI
cert1 CTu,Cu,Cu
cert2 CTu,Cu,Cu
cert3 CTu,Cu,Cu
This means only the database directory is interesting.
>> > + case VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH:
>> > + break;
>> > + case VIR_DOMAIN_SMARTCARD_TYPE_LAST:
>> > + break;
>> > + }
>> > + }
>
> It probably makes sense to add a code comment on why
> VIR_DOMAIN_SMARTCARD_TYPE_HOST, VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH
> and VIR_DOMAIN_SMARTCARD_TYPE_LAST aren't supported and ignored.
ok, will add a comment about not being able to test theses cases.
Arnaud.
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