[libvirt] [PATCH v3 2/5] security, apparmor: add (Set|Restore)InputLabel

[Jamie Strandboge]

On Wed, 2018-03-21 at 15:53 +0100, Christian Ehrhardt wrote:
> d8116b5a "security: Introduce functions for input device hot(un)plug"
> implemented the code (Set|Restore)InputLabel for several security
> modules,
> this patch adds an AppArmor implementation for it as well.
> 
> That fixes hot-plugging event input devices by generating a rule for
> the
> path that needs to be accessed.
> 
> Example hot adding:
>   <input type='passthrough' bus='virtio'>
>      <source evdev='/dev/input/event0' />
>   </input>
> Creates now:
>   "/dev/input/event0" rwk,
> 
> Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1755153
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
> ---
>  src/security/security_apparmor.c | 48
> ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/src/security/security_apparmor.c
> b/src/security/security_apparmor.c
> index 18908c8..92acc9e 100644
> --- a/src/security/security_apparmor.c
> +++ b/src/security/security_apparmor.c
> @@ -761,6 +761,51 @@ AppArmorRestoreMemoryLabel(virSecurityManagerPtr
> mgr,
>  
>  /* Called when hotplugging */
>  static int
> +AppArmorSetInputLabel(virSecurityManagerPtr mgr,
> +                      virDomainDefPtr def,
> +                      virDomainInputDefPtr input)
> +{
> +    if (input == NULL)
> +        return 0;
> +
> +    switch ((virDomainInputType) input->type) {
> +    case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
> +        if (input->source.evdev == NULL) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR,
> +                           _("%s: passthrough input device has no
> source"),
> +                           __func__);
> +            return -1;
> +        }
> +        if (!virFileExists(input->source.evdev)) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR,
> +                           _("%s: \'%s\' does not exist"),
> +                           __func__, input->source.evdev);
> +            return -1;
> +        }
> +        return reload_profile(mgr, def, input->source.evdev, true);
> +        break;
> +
> +    case VIR_DOMAIN_INPUT_TYPE_MOUSE:
> +    case VIR_DOMAIN_INPUT_TYPE_TABLET:
> +    case VIR_DOMAIN_INPUT_TYPE_KBD:
> +    case VIR_DOMAIN_INPUT_TYPE_LAST:
> +        break;
> +    }
> +
> +    return 0;
> +}
> +
> +
> +static int
> +AppArmorRestoreInputLabel(virSecurityManagerPtr mgr,
> +                          virDomainDefPtr def,
> +                          virDomainInputDefPtr input
> ATTRIBUTE_UNUSED)
> +{
> +    return reload_profile(mgr, def, NULL, false);
> +}
> +
> +/* Called when hotplugging */
> +static int
>  AppArmorSetSecurityImageLabel(virSecurityManagerPtr mgr,
>                                virDomainDefPtr def,
>                                virStorageSourcePtr src)
> @@ -1161,6 +1206,9 @@ virSecurityDriver virAppArmorSecurityDriver = {
>      .domainSetSecurityMemoryLabel       = AppArmorSetMemoryLabel,
>      .domainRestoreSecurityMemoryLabel   =
> AppArmorRestoreMemoryLabel,
>  
> +    .domainSetSecurityInputLabel        = AppArmorSetInputLabel,
> +    .domainRestoreSecurityInputLabel    = AppArmorRestoreInputLabel,
> +
>      .domainSetSecurityDaemonSocketLabel =
> AppArmorSetSecurityDaemonSocketLabel,
>      .domainSetSecuritySocketLabel       =
> AppArmorSetSecuritySocketLabel,
>      .domainClearSecuritySocketLabel     =
> AppArmorClearSecuritySocketLabel,

+1 to apply

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