Re: [PATCH] Passing a domain XML to a polkit rule engine

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On Thu, Jan 09, 2025 at 12:03:58AM -0500, Takuya Nakaike wrote:
> This patch is a draft implementation to pass a domain
> XML to a polkit access driver. With this new feature, a polkit rule can
> verify the domain XML to be deployed on a host, and thus protect deploying a
> malicious VM.
> 
> There is a discussion about this new feature in the following issue.
> 
> https://gitlab.com/libvirt/libvirt/-/issues/719
> 
> Any question, comment, and suggestion are welcome. Thanks,

Lets keep discussion on that issue. My comments there express why I think
this is a bad approach that should not be merged.

> diff --git a/src/access/viraccessdriverpolkit.c b/src/access/viraccessdriverpolkit.c
> index 83381183a5..56457010e0 100644
> --- a/src/access/viraccessdriverpolkit.c
> +++ b/src/access/viraccessdriverpolkit.c
> @@ -177,10 +177,12 @@ virAccessDriverPolkitCheckDomain(virAccessManager *manager,
>                                   virAccessPermDomain perm)
>  {
>      char uuidstr[VIR_UUID_STRING_BUFLEN];
> +    char *xml = virAccessManagerGetXMLDesc(domain);
>      const char *attrs[] = {
>          "connect_driver", driverName,
>          "domain_name", domain->name,
>          "domain_uuid", uuidstr,
> +        "xml", xml != NULL ? xml : "",
>          NULL,
>      };

NB, that's a memory leak


With regards,
Daniel
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