[libvirt] [libvirt-sandbox PATCH v2] Only set SELinux seclabel if supported by the host.

[Cédric Bosdonnat]

This code depends on new API in libvirt-gconfig to extract the
secmodels handled by the host.
---

 Diff to v1:
  * Adapted the naming change from libvirt-gconfig

 libvirt-sandbox/libvirt-sandbox-builder.c | 68 ++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 23 deletions(-)

diff --git a/libvirt-sandbox/libvirt-sandbox-builder.c b/libvirt-sandbox/libvirt-sandbox-builder.c
index 48b3acc..327f144 100644
--- a/libvirt-sandbox/libvirt-sandbox-builder.c
+++ b/libvirt-sandbox/libvirt-sandbox-builder.c
@@ -323,38 +323,60 @@ static gboolean gvir_sandbox_builder_construct_devices(GVirSandboxBuilder *build
 }
 
 
-static gboolean gvir_sandbox_builder_construct_security(GVirSandboxBuilder *builder G_GNUC_UNUSED,
+static gboolean gvir_sandbox_builder_construct_security(GVirSandboxBuilder *builder,
                                                         GVirSandboxConfig *config G_GNUC_UNUSED,
                                                         const gchar *statedir G_GNUC_UNUSED,
                                                         GVirConfigDomain *domain,
-                                                        GError **error G_GNUC_UNUSED)
+                                                        GError **error)
 {
     GVirConfigDomainSeclabel *sec = gvir_config_domain_seclabel_new();
     const char *label = gvir_sandbox_config_get_security_label(config);
+    GVirConnection *connection = gvir_sandbox_builder_get_connection(builder);
+    GVirConfigCapabilities *configCapabilities;
+    GVirConfigCapabilitiesHost *hostCapabilities;
+    GList *secmodels, *iter;
+    gboolean supportsSelinux = FALSE;
+
+    /* What security models are available on the host? */
+    if (!(configCapabilities = gvir_connection_get_capabilities(connection, error))) {
+        g_object_unref(sec);
+        return FALSE;
+    }
+
+    hostCapabilities = gvir_config_capabilities_get_host(configCapabilities);
 
-    gvir_config_domain_seclabel_set_model(sec, "selinux");
-    if (gvir_sandbox_config_get_security_dynamic(config)) {
-        gvir_config_domain_seclabel_set_type(sec,
-                                             GVIR_CONFIG_DOMAIN_SECLABEL_DYNAMIC);
-        if (label)
-            gvir_config_domain_seclabel_set_baselabel(sec, label);
-        else if (gvir_config_domain_get_virt_type(domain) ==
-                 GVIR_CONFIG_DOMAIN_VIRT_LXC)
-            gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_lxc_net_t:s0");
-        else if (gvir_config_domain_get_virt_type(domain) ==
-                 GVIR_CONFIG_DOMAIN_VIRT_QEMU)
-            gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_tcg_t:s0");
-        else if (gvir_config_domain_get_virt_type(domain) ==
-                 GVIR_CONFIG_DOMAIN_VIRT_KVM)
-            gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_t:s0");
-    } else {
-        gvir_config_domain_seclabel_set_type(sec,
-                                             GVIR_CONFIG_DOMAIN_SECLABEL_STATIC);
-        if (label)
-            gvir_config_domain_seclabel_set_label(sec, label);
+    secmodels = gvir_config_capabilities_host_get_secmodels(hostCapabilities);
+    for (iter = secmodels; iter != NULL; iter = iter->next) {
+        supportsSelinux = g_str_equal(gvir_config_capabilities_host_secmodel_get_model(
+                GVIR_CONFIG_CAPABILITIES_HOST_SECMODEL(iter->data)), "selinux");
+        g_object_unref(iter->data);
     }
 
-    gvir_config_domain_set_seclabel(domain, sec);
+    if (supportsSelinux) {
+        gvir_config_domain_seclabel_set_model(sec, "selinux");
+        if (gvir_sandbox_config_get_security_dynamic(config)) {
+            gvir_config_domain_seclabel_set_type(sec,
+                                                 GVIR_CONFIG_DOMAIN_SECLABEL_DYNAMIC);
+            if (label)
+                gvir_config_domain_seclabel_set_baselabel(sec, label);
+            else if (gvir_config_domain_get_virt_type(domain) ==
+                     GVIR_CONFIG_DOMAIN_VIRT_LXC)
+                gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_lxc_net_t:s0");
+            else if (gvir_config_domain_get_virt_type(domain) ==
+                     GVIR_CONFIG_DOMAIN_VIRT_QEMU)
+                gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_tcg_t:s0");
+            else if (gvir_config_domain_get_virt_type(domain) ==
+                     GVIR_CONFIG_DOMAIN_VIRT_KVM)
+                gvir_config_domain_seclabel_set_baselabel(sec, "system_u:system_r:svirt_t:s0");
+        } else {
+            gvir_config_domain_seclabel_set_type(sec,
+                                                 GVIR_CONFIG_DOMAIN_SECLABEL_STATIC);
+            if (label)
+                gvir_config_domain_seclabel_set_label(sec, label);
+        }
+
+        gvir_config_domain_set_seclabel(domain, sec);
+    }
     g_object_unref(sec);
 
     return TRUE;
-- 
1.8.4.5