Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 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 |
Chetan Pant | 036a80c | 2020-10-14 13:49:02 +0000 | [diff] [blame] | 9 | * version 2.1 of the License, or (at your option) any later version. |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 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" |
Markus Armbruster | 45b1f68 | 2019-03-15 15:51:17 +0100 | [diff] [blame] | 23 | #include "trace.h" |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 24 | #include "qemu/error-report.h" |
| 25 | #include "qemu/main-loop.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 26 | #include "qemu/module.h" |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 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" |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 33 | #include "qapi/qobject-input-visitor.h" |
| 34 | |
| 35 | |
| 36 | static bool |
| 37 | qauthz_list_file_is_allowed(QAuthZ *authz, |
| 38 | const char *identity, |
| 39 | Error **errp) |
| 40 | { |
| 41 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(authz); |
| 42 | if (fauthz->list) { |
| 43 | return qauthz_is_allowed(fauthz->list, identity, errp); |
| 44 | } |
| 45 | |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | |
| 50 | static QAuthZ * |
| 51 | qauthz_list_file_load(QAuthZListFile *fauthz, Error **errp) |
| 52 | { |
| 53 | GError *err = NULL; |
| 54 | gchar *content = NULL; |
| 55 | gsize len; |
| 56 | QObject *obj = NULL; |
| 57 | QDict *pdict; |
| 58 | Visitor *v = NULL; |
| 59 | QAuthZ *ret = NULL; |
| 60 | |
| 61 | trace_qauthz_list_file_load(fauthz, fauthz->filename); |
| 62 | if (!g_file_get_contents(fauthz->filename, &content, &len, &err)) { |
| 63 | error_setg(errp, "Unable to read '%s': %s", |
| 64 | fauthz->filename, err->message); |
| 65 | goto cleanup; |
| 66 | } |
| 67 | |
| 68 | obj = qobject_from_json(content, errp); |
| 69 | if (!obj) { |
| 70 | goto cleanup; |
| 71 | } |
| 72 | |
| 73 | pdict = qobject_to(QDict, obj); |
| 74 | if (!pdict) { |
Markus Armbruster | 8e26ae7 | 2020-11-13 07:23:58 +0100 | [diff] [blame] | 75 | error_setg(errp, "File '%s' must contain a JSON object", |
| 76 | fauthz->filename); |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 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 |
Daniel P. Berrangé | b4682a6 | 2019-03-19 15:47:47 +0000 | [diff] [blame] | 97 | qauthz_list_file_event(int64_t wd G_GNUC_UNUSED, |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 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 | |
Eduardo Habkost | 14b3948 | 2020-10-08 16:27:11 -0400 | [diff] [blame] | 125 | if (!fauthz->filename) { |
| 126 | error_setg(errp, "filename not provided"); |
| 127 | return; |
| 128 | } |
| 129 | |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 130 | fauthz->list = qauthz_list_file_load(fauthz, errp); |
Markus Armbruster | 2b37e9f | 2020-11-13 07:23:57 +0100 | [diff] [blame] | 131 | if (!fauthz->list) { |
| 132 | return; |
| 133 | } |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 134 | |
| 135 | if (!fauthz->refresh) { |
| 136 | return; |
| 137 | } |
| 138 | |
| 139 | fauthz->file_monitor = qemu_file_monitor_new(errp); |
| 140 | if (!fauthz->file_monitor) { |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | dir = g_path_get_dirname(fauthz->filename); |
| 145 | if (g_str_equal(dir, ".")) { |
| 146 | error_setg(errp, "Filename must be an absolute path"); |
| 147 | goto cleanup; |
| 148 | } |
| 149 | file = g_path_get_basename(fauthz->filename); |
| 150 | if (g_str_equal(file, ".")) { |
| 151 | error_setg(errp, "Path has no trailing filename component"); |
| 152 | goto cleanup; |
| 153 | } |
| 154 | |
| 155 | fauthz->file_watch = qemu_file_monitor_add_watch( |
| 156 | fauthz->file_monitor, dir, file, |
| 157 | qauthz_list_file_event, fauthz, errp); |
| 158 | if (fauthz->file_watch < 0) { |
| 159 | goto cleanup; |
| 160 | } |
| 161 | |
| 162 | cleanup: |
| 163 | g_free(file); |
| 164 | g_free(dir); |
| 165 | } |
| 166 | |
| 167 | |
| 168 | static void |
| 169 | qauthz_list_file_prop_set_filename(Object *obj, |
| 170 | const char *value, |
| 171 | Error **errp G_GNUC_UNUSED) |
| 172 | { |
| 173 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); |
| 174 | |
| 175 | g_free(fauthz->filename); |
| 176 | fauthz->filename = g_strdup(value); |
| 177 | } |
| 178 | |
| 179 | |
| 180 | static char * |
| 181 | qauthz_list_file_prop_get_filename(Object *obj, |
| 182 | Error **errp G_GNUC_UNUSED) |
| 183 | { |
| 184 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); |
| 185 | |
| 186 | return g_strdup(fauthz->filename); |
| 187 | } |
| 188 | |
| 189 | |
| 190 | static void |
| 191 | qauthz_list_file_prop_set_refresh(Object *obj, |
| 192 | bool value, |
| 193 | Error **errp G_GNUC_UNUSED) |
| 194 | { |
| 195 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); |
| 196 | |
| 197 | fauthz->refresh = value; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | static bool |
| 202 | qauthz_list_file_prop_get_refresh(Object *obj, |
| 203 | Error **errp G_GNUC_UNUSED) |
| 204 | { |
| 205 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); |
| 206 | |
| 207 | return fauthz->refresh; |
| 208 | } |
| 209 | |
| 210 | |
| 211 | static void |
| 212 | qauthz_list_file_finalize(Object *obj) |
| 213 | { |
| 214 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); |
| 215 | |
| 216 | object_unref(OBJECT(fauthz->list)); |
| 217 | g_free(fauthz->filename); |
| 218 | qemu_file_monitor_free(fauthz->file_monitor); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | static void |
| 223 | qauthz_list_file_class_init(ObjectClass *oc, void *data) |
| 224 | { |
| 225 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); |
| 226 | QAuthZClass *authz = QAUTHZ_CLASS(oc); |
| 227 | |
| 228 | ucc->complete = qauthz_list_file_complete; |
| 229 | |
| 230 | object_class_property_add_str(oc, "filename", |
| 231 | qauthz_list_file_prop_get_filename, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 232 | qauthz_list_file_prop_set_filename); |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 233 | object_class_property_add_bool(oc, "refresh", |
| 234 | qauthz_list_file_prop_get_refresh, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 235 | qauthz_list_file_prop_set_refresh); |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 236 | |
| 237 | authz->is_allowed = qauthz_list_file_is_allowed; |
| 238 | } |
| 239 | |
| 240 | |
| 241 | static void |
| 242 | qauthz_list_file_init(Object *obj) |
| 243 | { |
| 244 | QAuthZListFile *authz = QAUTHZ_LIST_FILE(obj); |
| 245 | |
| 246 | authz->file_watch = -1; |
| 247 | #ifdef CONFIG_INOTIFY1 |
Jafar Abdi | 834e8bf | 2019-03-23 17:26:34 +0300 | [diff] [blame] | 248 | authz->refresh = true; |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 249 | #endif |
| 250 | } |
| 251 | |
| 252 | |
| 253 | QAuthZListFile *qauthz_list_file_new(const char *id, |
| 254 | const char *filename, |
| 255 | bool refresh, |
| 256 | Error **errp) |
| 257 | { |
| 258 | return QAUTHZ_LIST_FILE( |
| 259 | object_new_with_props(TYPE_QAUTHZ_LIST_FILE, |
| 260 | object_get_objects_root(), |
| 261 | id, errp, |
| 262 | "filename", filename, |
| 263 | "refresh", refresh ? "yes" : "no", |
| 264 | NULL)); |
| 265 | } |
| 266 | |
| 267 | |
| 268 | static const TypeInfo qauthz_list_file_info = { |
| 269 | .parent = TYPE_QAUTHZ, |
| 270 | .name = TYPE_QAUTHZ_LIST_FILE, |
| 271 | .instance_init = qauthz_list_file_init, |
| 272 | .instance_size = sizeof(QAuthZListFile), |
| 273 | .instance_finalize = qauthz_list_file_finalize, |
Daniel P. Berrangé | 55d8698 | 2018-05-11 12:19:59 +0100 | [diff] [blame] | 274 | .class_init = qauthz_list_file_class_init, |
| 275 | .interfaces = (InterfaceInfo[]) { |
| 276 | { TYPE_USER_CREATABLE }, |
| 277 | { } |
| 278 | } |
| 279 | }; |
| 280 | |
| 281 | |
| 282 | static void |
| 283 | qauthz_list_file_register_types(void) |
| 284 | { |
| 285 | type_register_static(&qauthz_list_file_info); |
| 286 | } |
| 287 | |
| 288 | |
| 289 | type_init(qauthz_list_file_register_types); |