[libvirt] [PATCH 2/4] security, apparmor: add (Set|Restore)InputLabel

[Christian Ehrhardt]

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,

Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
---
 src/security/security_apparmor.c | 51 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/src/security/security_apparmor.c b/src/security/security_apparmor.c
index 4ae1e3d..7924b9a 100644
--- a/src/security/security_apparmor.c
+++ b/src/security/security_apparmor.c
@@ -765,6 +765,54 @@ AppArmorRestoreMemoryLabel(virSecurityManagerPtr mgr,
 
 /* Called when hotplugging */
 static int
+AppArmorSetInputLabel(virSecurityManagerPtr mgr,
+                      virDomainDefPtr def,
+                      virDomainInputDefPtr input)
+{
+    virSecurityLabelDefPtr secdef;
+
+    secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_APPARMOR_NAME);
+    if (!secdef || !secdef->relabel)
+        return 0;
+
+    switch ((virDomainInputType) input->type) {
+    case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
+        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)
+{
+    virSecurityLabelDefPtr secdef =
+        virDomainDefGetSecurityLabelDef(def, SECURITY_APPARMOR_NAME);
+
+    if (!secdef || !secdef->relabel)
+        return 0;
+
+    return reload_profile(mgr, def, NULL, false);
+}
+
+/* Called when hotplugging */
+static int
 AppArmorSetSecurityImageLabel(virSecurityManagerPtr mgr,
                               virDomainDefPtr def,
                               virStorageSourcePtr src)
@@ -1165,6 +1213,9 @@ virSecurityDriver virAppArmorSecurityDriver = {
     .domainSetSecurityMemoryLabel       = AppArmorSetMemoryLabel,
     .domainRestoreSecurityMemoryLabel   = AppArmorRestoreMemoryLabel,
 
+    .domainSetSecurityInputLabel        = AppArmorSetInputLabel,
+    .domainRestoreSecurityInputLabel    = AppArmorRestoreInputLabel,
+
     .domainSetSecurityDaemonSocketLabel = AppArmorSetSecurityDaemonSocketLabel,
     .domainSetSecuritySocketLabel       = AppArmorSetSecuritySocketLabel,
     .domainClearSecuritySocketLabel     = AppArmorClearSecuritySocketLabel,
-- 
2.7.4