[libvirt] [PATCH 3/4] virt-aa-helper: allow spaces in vm names

[Jamie Strandboge]

On Wed, 2017-09-20 at 16:59 +0200, Christian Ehrhardt wrote:
> libvirt allows spaces in vm names, there were issues in the past but
> it
> seems not removed so the assumption has to be that spaces are
> continuing
> to be allowed.
> 
> Therefore virt-aa-helper should not reject spaces in vm names anymore
> if
> it is goign to be refused causing issues then the parser or xml
> schema
> should do so.
> Apparmor rules are in quotes, so a space in a path based on the name
> works.
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
> ---
>  src/security/virt-aa-helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-
> helper.c
> index d1518ea..5f4519d 100644
> --- a/src/security/virt-aa-helper.c
> +++ b/src/security/virt-aa-helper.c
> @@ -449,7 +449,7 @@ valid_name(const char *name)
>  {
>      /* just try to filter out any dangerous characters in the name
> that can be
>       * used to subvert the profile */
> -    const char *bad = " /[]*";
> +    const char *bad = "/[]*";
>  
>      if (strlen(name) == 0)
>          return -1;

Your justification seems reasonable. It does mean that we'll need
always quote rules that use def->name and looking at virt-aa-helper.c,
that seems to be the case.

All that said, I was surprised that tests/virt-aa-helper-test didn't
need to be updated, but, indeed, this is a testing gap.

+1 as is, but perhaps in a follow-up patch you could expand bad to be:

  const char *bad = "/[]{}?^,\"*";

'{', '}', '?', '^', ',' and '"' are characters used in AARE (see
'Globbing' in 'man apparmor.d') and add tests to tests/virt-aa-helper-
test for this.

Thanks!

-- 
Jamie Strandboge             | http://www.canonical.com
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