Import QEMU upstream snapshot d2e570c

Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

authz/listfile.c

@@ -0,0 +1,289 @@
+/*
+ * QEMU access control list file 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/listfile.h"
+#include "trace.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "qemu/sockets.h"
+#include "qemu/filemonitor.h"
+#include "qom/object_interfaces.h"
+#include "qapi/qapi-visit-authz.h"
+#include "qobject/qjson.h"
+#include "qobject/qobject.h"
+#include "qapi/qobject-input-visitor.h"
+
+
+static bool
+qauthz_list_file_is_allowed(QAuthZ *authz,
+                            const char *identity,
+                            Error **errp)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(authz);
+    if (fauthz->list) {
+        return qauthz_is_allowed(fauthz->list, identity, errp);
+    }
+
+    return false;
+}
+
+
+static QAuthZ *
+qauthz_list_file_load(QAuthZListFile *fauthz, Error **errp)
+{
+    GError *err = NULL;
+    gchar *content = NULL;
+    gsize len;
+    QObject *obj = NULL;
+    QDict *pdict;
+    Visitor *v = NULL;
+    QAuthZ *ret = NULL;
+
+    trace_qauthz_list_file_load(fauthz, fauthz->filename);
+    if (!g_file_get_contents(fauthz->filename, &content, &len, &err)) {
+        error_setg(errp, "Unable to read '%s': %s",
+                   fauthz->filename, err->message);
+        goto cleanup;
+    }
+
+    obj = qobject_from_json(content, errp);
+    if (!obj) {
+        goto cleanup;
+    }
+
+    pdict = qobject_to(QDict, obj);
+    if (!pdict) {
+        error_setg(errp, "File '%s' must contain a JSON object",
+                   fauthz->filename);
+        goto cleanup;
+    }
+
+    v = qobject_input_visitor_new(obj);
+
+    ret = QAUTHZ(object_new_with_props_from_qdict_parentless(
+                     TYPE_QAUTHZ_LIST, pdict, v, errp));
+
+ cleanup:
+    visit_free(v);
+    qobject_unref(obj);
+    if (err) {
+        g_error_free(err);
+    }
+    g_free(content);
+    return ret;
+}
+
+
+static void
+qauthz_list_file_event(int64_t wd G_GNUC_UNUSED,
+                       QFileMonitorEvent ev G_GNUC_UNUSED,
+                       const char *name G_GNUC_UNUSED,
+                       void *opaque)
+{
+    QAuthZListFile *fauthz = opaque;
+    Error *err = NULL;
+
+    if (ev != QFILE_MONITOR_EVENT_MODIFIED &&
+        ev != QFILE_MONITOR_EVENT_CREATED) {
+        return;
+    }
+
+    object_unref(OBJECT(fauthz->list));
+    fauthz->list = qauthz_list_file_load(fauthz, &err);
+    trace_qauthz_list_file_refresh(fauthz,
+                                   fauthz->filename, fauthz->list ? 1 : 0);
+    if (!fauthz->list) {
+        error_report_err(err);
+    }
+}
+
+static void
+qauthz_list_file_complete(UserCreatable *uc, Error **errp)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(uc);
+    gchar *dir = NULL, *file = NULL;
+
+    if (!fauthz->filename) {
+        error_setg(errp, "filename not provided");
+        return;
+    }
+
+    fauthz->list = qauthz_list_file_load(fauthz, errp);
+    if (!fauthz->list) {
+        return;
+    }
+
+    if (!fauthz->refresh) {
+        return;
+    }
+
+    fauthz->file_monitor = qemu_file_monitor_new(errp);
+    if (!fauthz->file_monitor) {
+        return;
+    }
+
+    dir = g_path_get_dirname(fauthz->filename);
+    if (g_str_equal(dir, ".")) {
+        error_setg(errp, "Filename must be an absolute path");
+        goto cleanup;
+    }
+    file = g_path_get_basename(fauthz->filename);
+    if (g_str_equal(file, ".")) {
+        error_setg(errp, "Path has no trailing filename component");
+        goto cleanup;
+    }
+
+    fauthz->file_watch = qemu_file_monitor_add_watch(
+        fauthz->file_monitor, dir, file,
+        qauthz_list_file_event, fauthz, errp);
+    if (fauthz->file_watch < 0) {
+        goto cleanup;
+    }
+
+ cleanup:
+    g_free(file);
+    g_free(dir);
+}
+
+
+static void
+qauthz_list_file_prop_set_filename(Object *obj,
+                                   const char *value,
+                                   Error **errp G_GNUC_UNUSED)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj);
+
+    g_free(fauthz->filename);
+    fauthz->filename = g_strdup(value);
+}
+
+
+static char *
+qauthz_list_file_prop_get_filename(Object *obj,
+                                   Error **errp G_GNUC_UNUSED)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj);
+
+    return g_strdup(fauthz->filename);
+}
+
+
+static void
+qauthz_list_file_prop_set_refresh(Object *obj,
+                                  bool value,
+                                  Error **errp G_GNUC_UNUSED)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj);
+
+    fauthz->refresh = value;
+}
+
+
+static bool
+qauthz_list_file_prop_get_refresh(Object *obj,
+                                  Error **errp G_GNUC_UNUSED)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj);
+
+    return fauthz->refresh;
+}
+
+
+static void
+qauthz_list_file_finalize(Object *obj)
+{
+    QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj);
+
+    object_unref(OBJECT(fauthz->list));
+    g_free(fauthz->filename);
+    qemu_file_monitor_free(fauthz->file_monitor);
+}
+
+
+static void
+qauthz_list_file_class_init(ObjectClass *oc, const void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+    QAuthZClass *authz = QAUTHZ_CLASS(oc);
+
+    ucc->complete = qauthz_list_file_complete;
+
+    object_class_property_add_str(oc, "filename",
+                                  qauthz_list_file_prop_get_filename,
+                                  qauthz_list_file_prop_set_filename);
+    object_class_property_add_bool(oc, "refresh",
+                                   qauthz_list_file_prop_get_refresh,
+                                   qauthz_list_file_prop_set_refresh);
+
+    authz->is_allowed = qauthz_list_file_is_allowed;
+}
+
+
+static void
+qauthz_list_file_init(Object *obj)
+{
+    QAuthZListFile *authz = QAUTHZ_LIST_FILE(obj);
+
+    authz->file_watch = -1;
+#ifdef CONFIG_INOTIFY1
+    authz->refresh = true;
+#endif
+}
+
+
+QAuthZListFile *qauthz_list_file_new(const char *id,
+                                     const char *filename,
+                                     bool refresh,
+                                     Error **errp)
+{
+    return QAUTHZ_LIST_FILE(
+        object_new_with_props(TYPE_QAUTHZ_LIST_FILE,
+                              object_get_objects_root(),
+                              id, errp,
+                              "filename", filename,
+                              "refresh", refresh ? "yes" : "no",
+                              NULL));
+}
+
+
+static const TypeInfo qauthz_list_file_info = {
+    .parent = TYPE_QAUTHZ,
+    .name = TYPE_QAUTHZ_LIST_FILE,
+    .instance_init = qauthz_list_file_init,
+    .instance_size = sizeof(QAuthZListFile),
+    .instance_finalize = qauthz_list_file_finalize,
+    .class_init = qauthz_list_file_class_init,
+    .interfaces = (const InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+
+static void
+qauthz_list_file_register_types(void)
+{
+    type_register_static(&qauthz_list_file_info);
+}
+
+
+type_init(qauthz_list_file_register_types);