Re: [Qemu-devel] [PATCH v5 08/11] authz: add QAuthZList object type for an access control list

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 19/10/2018 14:41, Daniel P. Berrangé wrote:
> On Fri, Oct 19, 2018 at 11:57:45AM +0200, Philippe Mathieu-Daudé wrote:
>> On 09/10/2018 15:04, Daniel P. Berrangé wrote:
>>> From: "Daniel P. Berrange" <berrange@redhat.com>
>>>
>>> Add a QAuthZList object type that implements the QAuthZ interface. This
>>> built-in implementation maintains a trivial access control list with a
>>> sequence of match rules and a final default policy. This replicates the
>>> functionality currently provided by the qemu_acl module.
>>>
>>> To create an instance of this object via the QMP monitor, the syntax
>>> used would be:
>>>
>>>   {
>>>     "execute": "object-add",
>>>     "arguments": {
>>>       "qom-type": "authz-list",
>>>       "id": "authz0",
>>>       "parameters": {
>>>         "rules": [
>>>            { "match": "fred", "policy": "allow", "format": "exact" },
>>>            { "match": "bob", "policy": "allow", "format": "exact" },
>>>            { "match": "danb", "policy": "deny", "format": "glob" },
>>>            { "match": "dan*", "policy": "allow", "format": "exact" },
>>>         ],
>>>         "policy": "deny"
>>>       }
>>>     }
>>>   }
>>>
>>> This sets up an authorization rule that allows 'fred', 'bob' and anyone
>>> whose name starts with 'dan', except for 'danb'. Everyone unmatched is
>>> denied.
>>>
>>> It is not currently possible to create this via -object, since there is
>>> no syntax supported to specify non-scalar properties for objects. This
>>> is likely to be addressed by later support for using JSON with -object,
>>> or an equivalent approach.
>>>
>>> In any case the future "authz-listfile" object can be used from the
>>> CLI and is likely a better choice, as it allows the ACL to be refreshed
>>> automatically on change.
>>> +static void
>>> +qauthz_list_prop_set_policy(Object *obj,
>>> +                            int value,
>>> +                            Error **errp G_GNUC_UNUSED)
>>> +{
>>> +    QAuthZList *bauthz = QAUTHZ_LIST(obj);
>>> +
>>
>> Here:
>>
>>        g_free(bauthz->policy);
> 
> 'policy' is an integer, so I don't think we need g_free(0x1) :-)

Oops :^)

> 
>>
>>> +    bauthz->policy = value;
>>> +}
> 
> Regards,
> Daniel
>