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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" | |
55d86984 DB |
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) { | |
8e26ae7b MA |
75 | error_setg(errp, "File '%s' must contain a JSON object", |
76 | fauthz->filename); | |
55d86984 DB |
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 | |
b4682a63 | 97 | qauthz_list_file_event(int64_t wd G_GNUC_UNUSED, |
55d86984 DB |
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 | ||
14b39485 EH |
125 | if (!fauthz->filename) { |
126 | error_setg(errp, "filename not provided"); | |
127 | return; | |
128 | } | |
129 | ||
55d86984 | 130 | fauthz->list = qauthz_list_file_load(fauthz, errp); |
2b37e9f8 MA |
131 | if (!fauthz->list) { |
132 | return; | |
133 | } | |
55d86984 DB |
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, | |
d2623129 | 232 | qauthz_list_file_prop_set_filename); |
55d86984 DB |
233 | object_class_property_add_bool(oc, "refresh", |
234 | qauthz_list_file_prop_get_refresh, | |
d2623129 | 235 | qauthz_list_file_prop_set_refresh); |
55d86984 DB |
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 | |
834e8bf1 | 248 | authz->refresh = true; |
55d86984 DB |
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, | |
55d86984 DB |
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); |