1 /* 2 * QEMU access control list file authorization driver 3 * 4 * Copyright (c) 2018 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "qemu/osdep.h" 22 #include "authz/listfile.h" 23 #include "trace.h" 24 #include "qemu/error-report.h" 25 #include "qemu/main-loop.h" 26 #include "qemu/module.h" 27 #include "qemu/sockets.h" 28 #include "qemu/filemonitor.h" 29 #include "qom/object_interfaces.h" 30 #include "qapi/qapi-visit-authz.h" 31 #include "qapi/qmp/qjson.h" 32 #include "qapi/qmp/qobject.h" 33 #include "qapi/qmp/qerror.h" 34 #include "qapi/qobject-input-visitor.h" 35 36 37 static bool 38 qauthz_list_file_is_allowed(QAuthZ *authz, 39 const char *identity, 40 Error **errp) 41 { 42 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(authz); 43 if (fauthz->list) { 44 return qauthz_is_allowed(fauthz->list, identity, errp); 45 } 46 47 return false; 48 } 49 50 51 static QAuthZ * 52 qauthz_list_file_load(QAuthZListFile *fauthz, Error **errp) 53 { 54 GError *err = NULL; 55 gchar *content = NULL; 56 gsize len; 57 QObject *obj = NULL; 58 QDict *pdict; 59 Visitor *v = NULL; 60 QAuthZ *ret = NULL; 61 62 trace_qauthz_list_file_load(fauthz, fauthz->filename); 63 if (!g_file_get_contents(fauthz->filename, &content, &len, &err)) { 64 error_setg(errp, "Unable to read '%s': %s", 65 fauthz->filename, err->message); 66 goto cleanup; 67 } 68 69 obj = qobject_from_json(content, errp); 70 if (!obj) { 71 goto cleanup; 72 } 73 74 pdict = qobject_to(QDict, obj); 75 if (!pdict) { 76 error_setg(errp, QERR_INVALID_PARAMETER_TYPE, "obj", "dict"); 77 goto cleanup; 78 } 79 80 v = qobject_input_visitor_new(obj); 81 82 ret = (QAuthZ *)user_creatable_add_type(TYPE_QAUTHZ_LIST, 83 NULL, pdict, v, errp); 84 85 cleanup: 86 visit_free(v); 87 qobject_unref(obj); 88 if (err) { 89 g_error_free(err); 90 } 91 g_free(content); 92 return ret; 93 } 94 95 96 static void 97 qauthz_list_file_event(int64_t wd G_GNUC_UNUSED, 98 QFileMonitorEvent ev G_GNUC_UNUSED, 99 const char *name G_GNUC_UNUSED, 100 void *opaque) 101 { 102 QAuthZListFile *fauthz = opaque; 103 Error *err = NULL; 104 105 if (ev != QFILE_MONITOR_EVENT_MODIFIED && 106 ev != QFILE_MONITOR_EVENT_CREATED) { 107 return; 108 } 109 110 object_unref(OBJECT(fauthz->list)); 111 fauthz->list = qauthz_list_file_load(fauthz, &err); 112 trace_qauthz_list_file_refresh(fauthz, 113 fauthz->filename, fauthz->list ? 1 : 0); 114 if (!fauthz->list) { 115 error_report_err(err); 116 } 117 } 118 119 static void 120 qauthz_list_file_complete(UserCreatable *uc, Error **errp) 121 { 122 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(uc); 123 gchar *dir = NULL, *file = NULL; 124 125 if (!fauthz->filename) { 126 error_setg(errp, "filename not provided"); 127 return; 128 } 129 130 fauthz->list = qauthz_list_file_load(fauthz, errp); 131 132 if (!fauthz->refresh) { 133 return; 134 } 135 136 fauthz->file_monitor = qemu_file_monitor_new(errp); 137 if (!fauthz->file_monitor) { 138 return; 139 } 140 141 dir = g_path_get_dirname(fauthz->filename); 142 if (g_str_equal(dir, ".")) { 143 error_setg(errp, "Filename must be an absolute path"); 144 goto cleanup; 145 } 146 file = g_path_get_basename(fauthz->filename); 147 if (g_str_equal(file, ".")) { 148 error_setg(errp, "Path has no trailing filename component"); 149 goto cleanup; 150 } 151 152 fauthz->file_watch = qemu_file_monitor_add_watch( 153 fauthz->file_monitor, dir, file, 154 qauthz_list_file_event, fauthz, errp); 155 if (fauthz->file_watch < 0) { 156 goto cleanup; 157 } 158 159 cleanup: 160 g_free(file); 161 g_free(dir); 162 } 163 164 165 static void 166 qauthz_list_file_prop_set_filename(Object *obj, 167 const char *value, 168 Error **errp G_GNUC_UNUSED) 169 { 170 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); 171 172 g_free(fauthz->filename); 173 fauthz->filename = g_strdup(value); 174 } 175 176 177 static char * 178 qauthz_list_file_prop_get_filename(Object *obj, 179 Error **errp G_GNUC_UNUSED) 180 { 181 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); 182 183 return g_strdup(fauthz->filename); 184 } 185 186 187 static void 188 qauthz_list_file_prop_set_refresh(Object *obj, 189 bool value, 190 Error **errp G_GNUC_UNUSED) 191 { 192 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); 193 194 fauthz->refresh = value; 195 } 196 197 198 static bool 199 qauthz_list_file_prop_get_refresh(Object *obj, 200 Error **errp G_GNUC_UNUSED) 201 { 202 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); 203 204 return fauthz->refresh; 205 } 206 207 208 static void 209 qauthz_list_file_finalize(Object *obj) 210 { 211 QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); 212 213 object_unref(OBJECT(fauthz->list)); 214 g_free(fauthz->filename); 215 qemu_file_monitor_free(fauthz->file_monitor); 216 } 217 218 219 static void 220 qauthz_list_file_class_init(ObjectClass *oc, void *data) 221 { 222 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 223 QAuthZClass *authz = QAUTHZ_CLASS(oc); 224 225 ucc->complete = qauthz_list_file_complete; 226 227 object_class_property_add_str(oc, "filename", 228 qauthz_list_file_prop_get_filename, 229 qauthz_list_file_prop_set_filename); 230 object_class_property_add_bool(oc, "refresh", 231 qauthz_list_file_prop_get_refresh, 232 qauthz_list_file_prop_set_refresh); 233 234 authz->is_allowed = qauthz_list_file_is_allowed; 235 } 236 237 238 static void 239 qauthz_list_file_init(Object *obj) 240 { 241 QAuthZListFile *authz = QAUTHZ_LIST_FILE(obj); 242 243 authz->file_watch = -1; 244 #ifdef CONFIG_INOTIFY1 245 authz->refresh = true; 246 #endif 247 } 248 249 250 QAuthZListFile *qauthz_list_file_new(const char *id, 251 const char *filename, 252 bool refresh, 253 Error **errp) 254 { 255 return QAUTHZ_LIST_FILE( 256 object_new_with_props(TYPE_QAUTHZ_LIST_FILE, 257 object_get_objects_root(), 258 id, errp, 259 "filename", filename, 260 "refresh", refresh ? "yes" : "no", 261 NULL)); 262 } 263 264 265 static const TypeInfo qauthz_list_file_info = { 266 .parent = TYPE_QAUTHZ, 267 .name = TYPE_QAUTHZ_LIST_FILE, 268 .instance_init = qauthz_list_file_init, 269 .instance_size = sizeof(QAuthZListFile), 270 .instance_finalize = qauthz_list_file_finalize, 271 .class_init = qauthz_list_file_class_init, 272 .interfaces = (InterfaceInfo[]) { 273 { TYPE_USER_CREATABLE }, 274 { } 275 } 276 }; 277 278 279 static void 280 qauthz_list_file_register_types(void) 281 { 282 type_register_static(&qauthz_list_file_info); 283 } 284 285 286 type_init(qauthz_list_file_register_types); 287