Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 153 insertions, 0 deletions

diff --git a/authz/pamacct.c b/authz/pamacct.c
new file mode 100644
index 000000000..c862d9ff3
--- /dev/null
+++ b/authz/pamacct.c
@@ -0,0 +1,153 @@
+/*
+ * QEMU PAM authorization driver
+ *
+ * Copyright (c) 2018 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "authz/pamacct.h"
+#include "trace.h"
+#include "qemu/module.h"
+#include "qom/object_interfaces.h"
+
+#include <security/pam_appl.h>
+
+
+static bool qauthz_pam_is_allowed(QAuthZ *authz,
+                                  const char *identity,
+                                  Error **errp)
+{
+    QAuthZPAM *pauthz = QAUTHZ_PAM(authz);
+    const struct pam_conv pam_conversation = { 0 };
+    pam_handle_t *pamh = NULL;
+    int ret;
+
+    trace_qauthz_pam_check(authz, identity, pauthz->service);
+    ret = pam_start(pauthz->service,
+                    identity,
+                    &pam_conversation,
+                    &pamh);
+    if (ret != PAM_SUCCESS) {
+        error_setg(errp, "Unable to start PAM transaction: %s",
+                   pam_strerror(NULL, ret));
+        return false;
+    }
+
+    ret = pam_acct_mgmt(pamh, PAM_SILENT);
+    pam_end(pamh, ret);
+    if (ret != PAM_SUCCESS) {
+        error_setg(errp, "Unable to authorize user '%s': %s",
+                   identity, pam_strerror(pamh, ret));
+        return false;
+    }
+
+    return true;
+}
+
+
+static void
+qauthz_pam_prop_set_service(Object *obj,
+                            const char *service,
+                            Error **errp G_GNUC_UNUSED)
+{
+    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
+
+    g_free(pauthz->service);
+    pauthz->service = g_strdup(service);
+}
+
+
+static char *
+qauthz_pam_prop_get_service(Object *obj,
+                            Error **errp G_GNUC_UNUSED)
+{
+    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
+
+    return g_strdup(pauthz->service);
+}
+
+
+static void
+qauthz_pam_complete(UserCreatable *uc, Error **errp)
+{
+    QAuthZPAM *pauthz = QAUTHZ_PAM(uc);
+
+    if (!pauthz->service) {
+        error_setg(errp, "The 'service' property must be set");
+        return;
+    }
+}
+
+
+static void
+qauthz_pam_finalize(Object *obj)
+{
+    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
+
+    g_free(pauthz->service);
+}
+
+
+static void
+qauthz_pam_class_init(ObjectClass *oc, void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+    QAuthZClass *authz = QAUTHZ_CLASS(oc);
+
+    ucc->complete = qauthz_pam_complete;
+    authz->is_allowed = qauthz_pam_is_allowed;
+
+    object_class_property_add_str(oc, "service",
+                                  qauthz_pam_prop_get_service,
+                                  qauthz_pam_prop_set_service);
+}
+
+
+QAuthZPAM *qauthz_pam_new(const char *id,
+                          const char *service,
+                          Error **errp)
+{
+    return QAUTHZ_PAM(
+        object_new_with_props(TYPE_QAUTHZ_PAM,
+                              object_get_objects_root(),
+                              id, errp,
+                              "service", service,
+                              NULL));
+}
+
+
+static const TypeInfo qauthz_pam_info = {
+    .parent = TYPE_QAUTHZ,
+    .name = TYPE_QAUTHZ_PAM,
+    .instance_size = sizeof(QAuthZPAM),
+    .instance_finalize = qauthz_pam_finalize,
+    .class_init = qauthz_pam_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+
+static void
+qauthz_pam_register_types(void)
+{
+    type_register_static(&qauthz_pam_info);
+}
+
+
+type_init(qauthz_pam_register_types);