1/*
2 * util/fptr_wlist.c - function pointer whitelists.
3 *
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
5 *
6 * This software is open source.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 *
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36/**
37 * \file
38 *
39 * This file contains functions that check function pointers.
40 * The functions contain a whitelist of known good callback values.
41 * Any other values lead to an error.
42 *
43 * Due to the listing nature, this file violates all the modularization
44 * boundaries in the program.
45 */
46#include "config.h"
47#include "util/fptr_wlist.h"
48#include "util/mini_event.h"
49#include "services/outside_network.h"
50#include "services/mesh.h"
51#include "services/localzone.h"
52#include "services/cache/infra.h"
53#include "services/cache/rrset.h"
54#include "iterator/iterator.h"
55#include "iterator/iter_fwd.h"
56#include "validator/validator.h"
57#include "validator/val_anchor.h"
58#include "validator/val_nsec3.h"
59#include "validator/val_sigcrypt.h"
60#include "validator/val_kentry.h"
61#include "validator/val_neg.h"
62#include "validator/autotrust.h"
63#include "util/data/msgreply.h"
64#include "util/data/packed_rrset.h"
65#include "util/storage/slabhash.h"
66#include "util/storage/dnstree.h"
67#include "util/locks.h"
68#include "libunbound/libworker.h"
69#include "libunbound/context.h"
70#include "libunbound/worker.h"
71#include "util/tube.h"
72#include "util/config_file.h"
73#ifdef UB_ON_WINDOWS
74#include "winrc/win_svc.h"
75#endif
76
77#ifdef WITH_PYTHONMODULE
78#include "pythonmod/pythonmod.h"
79#endif
80
81int
82fptr_whitelist_comm_point(comm_point_callback_t *fptr)
83{
84	if(fptr == &worker_handle_request) return 1;
85	else if(fptr == &outnet_udp_cb) return 1;
86	else if(fptr == &outnet_tcp_cb) return 1;
87	else if(fptr == &tube_handle_listen) return 1;
88	return 0;
89}
90
91int
92fptr_whitelist_comm_point_raw(comm_point_callback_t *fptr)
93{
94	if(fptr == &tube_handle_listen) return 1;
95	else if(fptr == &tube_handle_write) return 1;
96	else if(fptr == &remote_accept_callback) return 1;
97	else if(fptr == &remote_control_callback) return 1;
98	return 0;
99}
100
101int
102fptr_whitelist_comm_timer(void (*fptr)(void*))
103{
104	if(fptr == &pending_udp_timer_cb) return 1;
105	else if(fptr == &outnet_tcptimer) return 1;
106	else if(fptr == &worker_stat_timer_cb) return 1;
107	else if(fptr == &worker_probe_timer_cb) return 1;
108#ifdef UB_ON_WINDOWS
109	else if(fptr == &wsvc_cron_cb) return 1;
110#endif
111	return 0;
112}
113
114int
115fptr_whitelist_comm_signal(void (*fptr)(int, void*))
116{
117	if(fptr == &worker_sighandler) return 1;
118	return 0;
119}
120
121int fptr_whitelist_start_accept(void (*fptr)(void*))
122{
123	if(fptr == &worker_start_accept) return 1;
124	return 0;
125}
126
127int fptr_whitelist_stop_accept(void (*fptr)(void*))
128{
129	if(fptr == &worker_stop_accept) return 1;
130	return 0;
131}
132
133int
134fptr_whitelist_event(void (*fptr)(int, short, void *))
135{
136	if(fptr == &comm_point_udp_callback) return 1;
137	else if(fptr == &comm_point_udp_ancil_callback) return 1;
138	else if(fptr == &comm_point_tcp_accept_callback) return 1;
139	else if(fptr == &comm_point_tcp_handle_callback) return 1;
140	else if(fptr == &comm_timer_callback) return 1;
141	else if(fptr == &comm_signal_callback) return 1;
142	else if(fptr == &comm_point_local_handle_callback) return 1;
143	else if(fptr == &comm_point_raw_handle_callback) return 1;
144	else if(fptr == &tube_handle_signal) return 1;
145	else if(fptr == &comm_base_handle_slow_accept) return 1;
146#ifdef UB_ON_WINDOWS
147	else if(fptr == &worker_win_stop_cb) return 1;
148#endif
149	return 0;
150}
151
152int
153fptr_whitelist_pending_udp(comm_point_callback_t *fptr)
154{
155	if(fptr == &serviced_udp_callback) return 1;
156	else if(fptr == &worker_handle_reply) return 1;
157	else if(fptr == &libworker_handle_reply) return 1;
158	return 0;
159}
160
161int
162fptr_whitelist_pending_tcp(comm_point_callback_t *fptr)
163{
164	if(fptr == &serviced_tcp_callback) return 1;
165	else if(fptr == &worker_handle_reply) return 1;
166	else if(fptr == &libworker_handle_reply) return 1;
167	return 0;
168}
169
170int
171fptr_whitelist_serviced_query(comm_point_callback_t *fptr)
172{
173	if(fptr == &worker_handle_service_reply) return 1;
174	else if(fptr == &libworker_handle_service_reply) return 1;
175	return 0;
176}
177
178int
179fptr_whitelist_rbtree_cmp(int (*fptr) (const void *, const void *))
180{
181	if(fptr == &mesh_state_compare) return 1;
182	else if(fptr == &mesh_state_ref_compare) return 1;
183	else if(fptr == &addr_tree_compare) return 1;
184	else if(fptr == &local_zone_cmp) return 1;
185	else if(fptr == &local_data_cmp) return 1;
186	else if(fptr == &fwd_cmp) return 1;
187	else if(fptr == &pending_cmp) return 1;
188	else if(fptr == &serviced_cmp) return 1;
189	else if(fptr == &name_tree_compare) return 1;
190	else if(fptr == &order_lock_cmp) return 1;
191	else if(fptr == &codeline_cmp) return 1;
192	else if(fptr == &nsec3_hash_cmp) return 1;
193	else if(fptr == &mini_ev_cmp) return 1;
194	else if(fptr == &anchor_cmp) return 1;
195	else if(fptr == &canonical_tree_compare) return 1;
196	else if(fptr == &context_query_cmp) return 1;
197	else if(fptr == &val_neg_data_compare) return 1;
198	else if(fptr == &val_neg_zone_compare) return 1;
199	else if(fptr == &probetree_cmp) return 1;
200	else if(fptr == &replay_var_compare) return 1;
201	return 0;
202}
203
204int
205fptr_whitelist_hash_sizefunc(lruhash_sizefunc_t fptr)
206{
207	if(fptr == &msgreply_sizefunc) return 1;
208	else if(fptr == &ub_rrset_sizefunc) return 1;
209	else if(fptr == &infra_sizefunc) return 1;
210	else if(fptr == &key_entry_sizefunc) return 1;
211	else if(fptr == &test_slabhash_sizefunc) return 1;
212	return 0;
213}
214
215int
216fptr_whitelist_hash_compfunc(lruhash_compfunc_t fptr)
217{
218	if(fptr == &query_info_compare) return 1;
219	else if(fptr == &ub_rrset_compare) return 1;
220	else if(fptr == &infra_compfunc) return 1;
221	else if(fptr == &key_entry_compfunc) return 1;
222	else if(fptr == &test_slabhash_compfunc) return 1;
223	return 0;
224}
225
226int
227fptr_whitelist_hash_delkeyfunc(lruhash_delkeyfunc_t fptr)
228{
229	if(fptr == &query_entry_delete) return 1;
230	else if(fptr == &ub_rrset_key_delete) return 1;
231	else if(fptr == &infra_delkeyfunc) return 1;
232	else if(fptr == &key_entry_delkeyfunc) return 1;
233	else if(fptr == &test_slabhash_delkey) return 1;
234	return 0;
235}
236
237int
238fptr_whitelist_hash_deldatafunc(lruhash_deldatafunc_t fptr)
239{
240	if(fptr == &reply_info_delete) return 1;
241	else if(fptr == &rrset_data_delete) return 1;
242	else if(fptr == &infra_deldatafunc) return 1;
243	else if(fptr == &key_entry_deldatafunc) return 1;
244	else if(fptr == &test_slabhash_deldata) return 1;
245	return 0;
246}
247
248int
249fptr_whitelist_hash_markdelfunc(lruhash_markdelfunc_t fptr)
250{
251	if(fptr == NULL) return 1;
252	else if(fptr == &rrset_markdel) return 1;
253	return 0;
254}
255
256/** whitelist env->send_query callbacks */
257int
258fptr_whitelist_modenv_send_query(struct outbound_entry* (*fptr)(
259        uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
260        uint16_t flags, int dnssec, int want_dnssec,
261	struct sockaddr_storage* addr, socklen_t addrlen,
262	uint8_t* zone, size_t zonelen,
263	struct module_qstate* q))
264{
265	if(fptr == &worker_send_query) return 1;
266	else if(fptr == &libworker_send_query) return 1;
267	return 0;
268}
269
270int
271fptr_whitelist_modenv_detach_subs(void (*fptr)(
272        struct module_qstate* qstate))
273{
274	if(fptr == &mesh_detach_subs) return 1;
275	return 0;
276}
277
278int
279fptr_whitelist_modenv_attach_sub(int (*fptr)(
280        struct module_qstate* qstate, struct query_info* qinfo,
281        uint16_t qflags, int prime, struct module_qstate** newq))
282{
283	if(fptr == &mesh_attach_sub) return 1;
284	return 0;
285}
286
287int
288fptr_whitelist_modenv_kill_sub(void (*fptr)(struct module_qstate* newq))
289{
290	if(fptr == &mesh_state_delete) return 1;
291	return 0;
292}
293
294int
295fptr_whitelist_modenv_detect_cycle(int (*fptr)(
296	struct module_qstate* qstate, struct query_info* qinfo,
297	uint16_t flags, int prime))
298{
299	if(fptr == &mesh_detect_cycle) return 1;
300	return 0;
301}
302
303int
304fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id))
305{
306	if(fptr == &iter_init) return 1;
307	else if(fptr == &val_init) return 1;
308#ifdef WITH_PYTHONMODULE
309	else if(fptr == &pythonmod_init) return 1;
310#endif
311	return 0;
312}
313
314int
315fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id))
316{
317	if(fptr == &iter_deinit) return 1;
318	else if(fptr == &val_deinit) return 1;
319#ifdef WITH_PYTHONMODULE
320	else if(fptr == &pythonmod_deinit) return 1;
321#endif
322	return 0;
323}
324
325int
326fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate,
327        enum module_ev event, int id, struct outbound_entry* outbound))
328{
329	if(fptr == &iter_operate) return 1;
330	else if(fptr == &val_operate) return 1;
331#ifdef WITH_PYTHONMODULE
332	else if(fptr == &pythonmod_operate) return 1;
333#endif
334	return 0;
335}
336
337int
338fptr_whitelist_mod_inform_super(void (*fptr)(
339        struct module_qstate* qstate, int id, struct module_qstate* super))
340{
341	if(fptr == &iter_inform_super) return 1;
342	else if(fptr == &val_inform_super) return 1;
343#ifdef WITH_PYTHONMODULE
344	else if(fptr == &pythonmod_inform_super) return 1;
345#endif
346	return 0;
347}
348
349int
350fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate,
351        int id))
352{
353	if(fptr == &iter_clear) return 1;
354	else if(fptr == &val_clear) return 1;
355#ifdef WITH_PYTHONMODULE
356	else if(fptr == &pythonmod_clear) return 1;
357#endif
358	return 0;
359}
360
361int
362fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id))
363{
364	if(fptr == &iter_get_mem) return 1;
365	else if(fptr == &val_get_mem) return 1;
366#ifdef WITH_PYTHONMODULE
367	else if(fptr == &pythonmod_get_mem) return 1;
368#endif
369	return 0;
370}
371
372int
373fptr_whitelist_alloc_cleanup(void (*fptr)(void*))
374{
375	if(fptr == &worker_alloc_cleanup) return 1;
376	return 0;
377}
378
379int fptr_whitelist_tube_listen(tube_callback_t* fptr)
380{
381	if(fptr == &worker_handle_control_cmd) return 1;
382	else if(fptr == &libworker_handle_control_cmd) return 1;
383	return 0;
384}
385
386int fptr_whitelist_mesh_cb(mesh_cb_func_t fptr)
387{
388	if(fptr == &libworker_fg_done_cb) return 1;
389	else if(fptr == &libworker_bg_done_cb) return 1;
390	else if(fptr == &probe_answer_cb) return 1;
391	return 0;
392}
393
394int fptr_whitelist_print_func(void (*fptr)(char*,void*))
395{
396	if(fptr == &config_print_func) return 1;
397	else if(fptr == &config_collate_func) return 1;
398	else if(fptr == &remote_get_opt_ssl) return 1;
399	return 0;
400}
401