]>
Commit | Line | Data |
---|---|---|
55d86984 DB |
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 | |
036a80cd | 9 | * version 2.1 of the License, or (at your option) any later version. |
55d86984 DB |
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" | |
45b1f68c | 23 | #include "trace.h" |
55d86984 DB |
24 | #include "qemu/error-report.h" |
25 | #include "qemu/main-loop.h" | |
0b8fa32f | 26 | #include "qemu/module.h" |
55d86984 DB |
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) { | |
8e26ae7b MA |
76 | error_setg(errp, "File '%s' must contain a JSON object", |
77 | fauthz->filename); | |
55d86984 DB |
78 | goto cleanup; |
79 | } | |
80 | ||
81 | v = qobject_input_visitor_new(obj); | |
82 | ||
83 | ret = (QAuthZ *)user_creatable_add_type(TYPE_QAUTHZ_LIST, | |
84 | NULL, pdict, v, errp); | |
85 | ||
86 | cleanup: | |
87 | visit_free(v); | |
88 | qobject_unref(obj); | |
89 | if (err) { | |
90 | g_error_free(err); | |
91 | } | |
92 | g_free(content); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | ||
97 | static void | |
b4682a63 | 98 | qauthz_list_file_event(int64_t wd G_GNUC_UNUSED, |
55d86984 DB |
99 | QFileMonitorEvent ev G_GNUC_UNUSED, |
100 | const char *name G_GNUC_UNUSED, | |
101 | void *opaque) | |
102 | { | |
103 | QAuthZListFile *fauthz = opaque; | |
104 | Error *err = NULL; | |
105 | ||
106 | if (ev != QFILE_MONITOR_EVENT_MODIFIED && | |
107 | ev != QFILE_MONITOR_EVENT_CREATED) { | |
108 | return; | |
109 | } | |
110 | ||
111 | object_unref(OBJECT(fauthz->list)); | |
112 | fauthz->list = qauthz_list_file_load(fauthz, &err); | |
113 | trace_qauthz_list_file_refresh(fauthz, | |
114 | fauthz->filename, fauthz->list ? 1 : 0); | |
115 | if (!fauthz->list) { | |
116 | error_report_err(err); | |
117 | } | |
118 | } | |
119 | ||
120 | static void | |
121 | qauthz_list_file_complete(UserCreatable *uc, Error **errp) | |
122 | { | |
123 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(uc); | |
124 | gchar *dir = NULL, *file = NULL; | |
125 | ||
14b39485 EH |
126 | if (!fauthz->filename) { |
127 | error_setg(errp, "filename not provided"); | |
128 | return; | |
129 | } | |
130 | ||
55d86984 | 131 | fauthz->list = qauthz_list_file_load(fauthz, errp); |
2b37e9f8 MA |
132 | if (!fauthz->list) { |
133 | return; | |
134 | } | |
55d86984 DB |
135 | |
136 | if (!fauthz->refresh) { | |
137 | return; | |
138 | } | |
139 | ||
140 | fauthz->file_monitor = qemu_file_monitor_new(errp); | |
141 | if (!fauthz->file_monitor) { | |
142 | return; | |
143 | } | |
144 | ||
145 | dir = g_path_get_dirname(fauthz->filename); | |
146 | if (g_str_equal(dir, ".")) { | |
147 | error_setg(errp, "Filename must be an absolute path"); | |
148 | goto cleanup; | |
149 | } | |
150 | file = g_path_get_basename(fauthz->filename); | |
151 | if (g_str_equal(file, ".")) { | |
152 | error_setg(errp, "Path has no trailing filename component"); | |
153 | goto cleanup; | |
154 | } | |
155 | ||
156 | fauthz->file_watch = qemu_file_monitor_add_watch( | |
157 | fauthz->file_monitor, dir, file, | |
158 | qauthz_list_file_event, fauthz, errp); | |
159 | if (fauthz->file_watch < 0) { | |
160 | goto cleanup; | |
161 | } | |
162 | ||
163 | cleanup: | |
164 | g_free(file); | |
165 | g_free(dir); | |
166 | } | |
167 | ||
168 | ||
169 | static void | |
170 | qauthz_list_file_prop_set_filename(Object *obj, | |
171 | const char *value, | |
172 | Error **errp G_GNUC_UNUSED) | |
173 | { | |
174 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); | |
175 | ||
176 | g_free(fauthz->filename); | |
177 | fauthz->filename = g_strdup(value); | |
178 | } | |
179 | ||
180 | ||
181 | static char * | |
182 | qauthz_list_file_prop_get_filename(Object *obj, | |
183 | Error **errp G_GNUC_UNUSED) | |
184 | { | |
185 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); | |
186 | ||
187 | return g_strdup(fauthz->filename); | |
188 | } | |
189 | ||
190 | ||
191 | static void | |
192 | qauthz_list_file_prop_set_refresh(Object *obj, | |
193 | bool value, | |
194 | Error **errp G_GNUC_UNUSED) | |
195 | { | |
196 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); | |
197 | ||
198 | fauthz->refresh = value; | |
199 | } | |
200 | ||
201 | ||
202 | static bool | |
203 | qauthz_list_file_prop_get_refresh(Object *obj, | |
204 | Error **errp G_GNUC_UNUSED) | |
205 | { | |
206 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); | |
207 | ||
208 | return fauthz->refresh; | |
209 | } | |
210 | ||
211 | ||
212 | static void | |
213 | qauthz_list_file_finalize(Object *obj) | |
214 | { | |
215 | QAuthZListFile *fauthz = QAUTHZ_LIST_FILE(obj); | |
216 | ||
217 | object_unref(OBJECT(fauthz->list)); | |
218 | g_free(fauthz->filename); | |
219 | qemu_file_monitor_free(fauthz->file_monitor); | |
220 | } | |
221 | ||
222 | ||
223 | static void | |
224 | qauthz_list_file_class_init(ObjectClass *oc, void *data) | |
225 | { | |
226 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); | |
227 | QAuthZClass *authz = QAUTHZ_CLASS(oc); | |
228 | ||
229 | ucc->complete = qauthz_list_file_complete; | |
230 | ||
231 | object_class_property_add_str(oc, "filename", | |
232 | qauthz_list_file_prop_get_filename, | |
d2623129 | 233 | qauthz_list_file_prop_set_filename); |
55d86984 DB |
234 | object_class_property_add_bool(oc, "refresh", |
235 | qauthz_list_file_prop_get_refresh, | |
d2623129 | 236 | qauthz_list_file_prop_set_refresh); |
55d86984 DB |
237 | |
238 | authz->is_allowed = qauthz_list_file_is_allowed; | |
239 | } | |
240 | ||
241 | ||
242 | static void | |
243 | qauthz_list_file_init(Object *obj) | |
244 | { | |
245 | QAuthZListFile *authz = QAUTHZ_LIST_FILE(obj); | |
246 | ||
247 | authz->file_watch = -1; | |
248 | #ifdef CONFIG_INOTIFY1 | |
834e8bf1 | 249 | authz->refresh = true; |
55d86984 DB |
250 | #endif |
251 | } | |
252 | ||
253 | ||
254 | QAuthZListFile *qauthz_list_file_new(const char *id, | |
255 | const char *filename, | |
256 | bool refresh, | |
257 | Error **errp) | |
258 | { | |
259 | return QAUTHZ_LIST_FILE( | |
260 | object_new_with_props(TYPE_QAUTHZ_LIST_FILE, | |
261 | object_get_objects_root(), | |
262 | id, errp, | |
263 | "filename", filename, | |
264 | "refresh", refresh ? "yes" : "no", | |
265 | NULL)); | |
266 | } | |
267 | ||
268 | ||
269 | static const TypeInfo qauthz_list_file_info = { | |
270 | .parent = TYPE_QAUTHZ, | |
271 | .name = TYPE_QAUTHZ_LIST_FILE, | |
272 | .instance_init = qauthz_list_file_init, | |
273 | .instance_size = sizeof(QAuthZListFile), | |
274 | .instance_finalize = qauthz_list_file_finalize, | |
55d86984 DB |
275 | .class_init = qauthz_list_file_class_init, |
276 | .interfaces = (InterfaceInfo[]) { | |
277 | { TYPE_USER_CREATABLE }, | |
278 | { } | |
279 | } | |
280 | }; | |
281 | ||
282 | ||
283 | static void | |
284 | qauthz_list_file_register_types(void) | |
285 | { | |
286 | type_register_static(&qauthz_list_file_info); | |
287 | } | |
288 | ||
289 | ||
290 | type_init(qauthz_list_file_register_types); |