1 /*
2 * smallapp/unbound-checkconf.c - config file checker for unbound.conf file.
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
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 /**
37 * \file
38 *
39 * The config checker checks for syntax and other errors in the unbound.conf
40 * file, and can be used to check for errors before the server is started
41 * or sigHUPped.
42 * Exit status 1 means an error.
43 */
44
45 #include "config.h"
46 #include <ctype.h>
47 #include "util/log.h"
48 #include "util/config_file.h"
49 #include "util/module.h"
50 #include "util/net_help.h"
51 #include "util/regional.h"
52 #include "iterator/iterator.h"
53 #include "iterator/iter_fwd.h"
54 #include "iterator/iter_hints.h"
55 #include "validator/validator.h"
56 #include "services/localzone.h"
57 #include "services/listen_dnsport.h"
58 #include "services/view.h"
59 #include "services/authzone.h"
60 #include "respip/respip.h"
61 #include "sldns/sbuffer.h"
62 #include "sldns/str2wire.h"
63 #ifdef HAVE_GETOPT_H
64 #include <getopt.h>
65 #endif
66 #ifdef HAVE_PWD_H
67 #include <pwd.h>
68 #endif
69 #ifdef HAVE_SYS_STAT_H
70 #include <sys/stat.h>
71 #endif
72 #ifdef HAVE_GLOB_H
73 #include <glob.h>
74 #endif
75 #ifdef WITH_PYTHONMODULE
76 #include "pythonmod/pythonmod.h"
77 #endif
78 #ifdef CLIENT_SUBNET
79 #include "edns-subnet/subnet-whitelist.h"
80 #endif
81
82 /** Give checkconf usage, and exit (1). */
83 static void
usage(void)84 usage(void)
85 {
86 printf("Usage: unbound-checkconf [file]\n");
87 printf(" Checks unbound configuration file for errors.\n");
88 printf("file if omitted %s is used.\n", CONFIGFILE);
89 printf("-o option print value of option to stdout.\n");
90 printf("-f output full pathname with chroot applied, eg. with -o pidfile.\n");
91 printf("-h show this usage help.\n");
92 printf("Version %s\n", PACKAGE_VERSION);
93 printf("BSD licensed, see LICENSE in source package for details.\n");
94 printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
95 exit(1);
96 }
97
98 /**
99 * Print given option to stdout
100 * @param cfg: config
101 * @param opt: option name without trailing :.
102 * This is different from config_set_option.
103 * @param final: if final pathname with chroot applied has to be printed.
104 */
105 static void
print_option(struct config_file * cfg,const char * opt,int final)106 print_option(struct config_file* cfg, const char* opt, int final)
107 {
108 if(strcmp(opt, "pidfile") == 0 && final) {
109 char *p = fname_after_chroot(cfg->pidfile, cfg, 1);
110 if(!p) fatal_exit("out of memory");
111 printf("%s\n", p);
112 free(p);
113 return;
114 }
115 if(strcmp(opt, "auto-trust-anchor-file") == 0 && final) {
116 struct config_strlist* s = cfg->auto_trust_anchor_file_list;
117 for(; s; s=s->next) {
118 char *p = fname_after_chroot(s->str, cfg, 1);
119 if(!p) fatal_exit("out of memory");
120 printf("%s\n", p);
121 free(p);
122 }
123 return;
124 }
125 if(!config_get_option(cfg, opt, config_print_func, stdout))
126 fatal_exit("cannot print option '%s'", opt);
127 }
128
129 /** check if module works with config */
130 static void
check_mod(struct config_file * cfg,struct module_func_block * fb)131 check_mod(struct config_file* cfg, struct module_func_block* fb)
132 {
133 struct module_env env;
134 memset(&env, 0, sizeof(env));
135 env.cfg = cfg;
136 env.scratch = regional_create();
137 env.scratch_buffer = sldns_buffer_new(BUFSIZ);
138 if(!env.scratch || !env.scratch_buffer)
139 fatal_exit("out of memory");
140 if(!edns_known_options_init(&env))
141 fatal_exit("out of memory");
142 if(!(*fb->init)(&env, 0)) {
143 fatal_exit("bad config for %s module", fb->name);
144 }
145 (*fb->deinit)(&env, 0);
146 sldns_buffer_free(env.scratch_buffer);
147 regional_destroy(env.scratch);
148 edns_known_options_delete(&env);
149 }
150
151 /** true if addr is a localhost address, 127.0.0.1 or ::1 (with maybe "@port"
152 * after it) */
153 static int
str_addr_is_localhost(const char * a)154 str_addr_is_localhost(const char* a)
155 {
156 if(strncmp(a, "127.", 4) == 0) return 1;
157 if(strncmp(a, "::1", 3) == 0) return 1;
158 return 0;
159 }
160
161 /** check do-not-query-localhost */
162 static void
donotquerylocalhostcheck(struct config_file * cfg)163 donotquerylocalhostcheck(struct config_file* cfg)
164 {
165 if(cfg->donotquery_localhost) {
166 struct config_stub* p;
167 struct config_strlist* s;
168 for(p=cfg->forwards; p; p=p->next) {
169 for(s=p->addrs; s; s=s->next) {
170 if(str_addr_is_localhost(s->str)) {
171 fprintf(stderr, "unbound-checkconf: warning: forward-addr: '%s' is specified for forward-zone: '%s', but do-not-query-localhost: yes means that the address will not be used for lookups.\n",
172 s->str, p->name);
173 }
174 }
175 }
176 for(p=cfg->stubs; p; p=p->next) {
177 for(s=p->addrs; s; s=s->next) {
178 if(str_addr_is_localhost(s->str)) {
179 fprintf(stderr, "unbound-checkconf: warning: stub-addr: '%s' is specified for stub-zone: '%s', but do-not-query-localhost: yes means that the address will not be used for lookups.\n",
180 s->str, p->name);
181 }
182 }
183 }
184 }
185 }
186
187 /** check localzones */
188 static void
localzonechecks(struct config_file * cfg)189 localzonechecks(struct config_file* cfg)
190 {
191 struct local_zones* zs;
192 if(!(zs = local_zones_create()))
193 fatal_exit("out of memory");
194 if(!local_zones_apply_cfg(zs, cfg))
195 fatal_exit("failed local-zone, local-data configuration");
196 local_zones_delete(zs);
197 }
198
199 /** checks for acl and views */
200 static void
acl_view_tag_checks(struct config_file * cfg,struct views * views)201 acl_view_tag_checks(struct config_file* cfg, struct views* views)
202 {
203 int d;
204 struct sockaddr_storage a;
205 socklen_t alen;
206 struct config_str2list* acl;
207 struct config_str3list* s3;
208 struct config_strbytelist* sb;
209
210 /* acl_view */
211 for(acl=cfg->acl_view; acl; acl = acl->next) {
212 struct view* v;
213 if(!netblockstrtoaddr(acl->str, UNBOUND_DNS_PORT, &a, &alen,
214 &d)) {
215 fatal_exit("cannot parse access-control-view "
216 "address %s %s", acl->str, acl->str2);
217 }
218 v = views_find_view(views, acl->str2, 0);
219 if(!v) {
220 fatal_exit("cannot find view for "
221 "access-control-view: %s %s",
222 acl->str, acl->str2);
223 }
224 lock_rw_unlock(&v->lock);
225 }
226
227 /* acl_tags */
228 for(sb=cfg->acl_tags; sb; sb = sb->next) {
229 if(!netblockstrtoaddr(sb->str, UNBOUND_DNS_PORT, &a, &alen,
230 &d)) {
231 fatal_exit("cannot parse access-control-tags "
232 "address %s", sb->str);
233 }
234 }
235
236 /* acl_tag_actions */
237 for(s3=cfg->acl_tag_actions; s3; s3 = s3->next) {
238 enum localzone_type t;
239 if(!netblockstrtoaddr(s3->str, UNBOUND_DNS_PORT, &a, &alen,
240 &d)) {
241 fatal_exit("cannot parse access-control-tag-actions "
242 "address %s %s %s",
243 s3->str, s3->str2, s3->str3);
244 }
245 if(find_tag_id(cfg, s3->str2) == -1) {
246 fatal_exit("cannot parse tag %s (define-tag it), "
247 "for access-control-tag-actions: %s %s %s",
248 s3->str2, s3->str, s3->str2, s3->str3);
249 }
250 if(!local_zone_str2type(s3->str3, &t)) {
251 fatal_exit("cannot parse access control action type %s"
252 " for access-control-tag-actions: %s %s %s",
253 s3->str3, s3->str, s3->str2, s3->str3);
254 }
255 }
256
257 /* acl_tag_datas */
258 for(s3=cfg->acl_tag_datas; s3; s3 = s3->next) {
259 char buf[65536];
260 uint8_t rr[LDNS_RR_BUF_SIZE];
261 size_t len = sizeof(rr);
262 int res;
263 if(!netblockstrtoaddr(s3->str, UNBOUND_DNS_PORT, &a, &alen,
264 &d)) {
265 fatal_exit("cannot parse access-control-tag-datas address %s %s '%s'",
266 s3->str, s3->str2, s3->str3);
267 }
268 if(find_tag_id(cfg, s3->str2) == -1) {
269 fatal_exit("cannot parse tag %s (define-tag it), "
270 "for access-control-tag-datas: %s %s '%s'",
271 s3->str2, s3->str, s3->str2, s3->str3);
272 }
273 /* '.' is sufficient for validation, and it makes the call to
274 * sldns_wirerr_get_type() simpler below. */
275 snprintf(buf, sizeof(buf), "%s %s", ".", s3->str3);
276 res = sldns_str2wire_rr_buf(buf, rr, &len, NULL, 3600, NULL,
277 0, NULL, 0);
278 if(res != 0) {
279 fatal_exit("cannot parse rr data [char %d] parse error %s, for access-control-tag-datas: %s %s '%s'",
280 (int)LDNS_WIREPARSE_OFFSET(res)-2,
281 sldns_get_errorstr_parse(res),
282 s3->str, s3->str2, s3->str3);
283 }
284 }
285 }
286
287 /** check view and response-ip configuration */
288 static void
view_and_respipchecks(struct config_file * cfg)289 view_and_respipchecks(struct config_file* cfg)
290 {
291 struct views* views = NULL;
292 struct respip_set* respip = NULL;
293 int ignored = 0;
294 if(!(views = views_create()))
295 fatal_exit("Could not create views: out of memory");
296 if(!(respip = respip_set_create()))
297 fatal_exit("Could not create respip set: out of memory");
298 if(!views_apply_cfg(views, cfg))
299 fatal_exit("Could not set up views");
300 if(!respip_global_apply_cfg(respip, cfg))
301 fatal_exit("Could not setup respip set");
302 if(!respip_views_apply_cfg(views, cfg, &ignored))
303 fatal_exit("Could not setup per-view respip sets");
304 acl_view_tag_checks(cfg, views);
305 views_delete(views);
306 respip_set_delete(respip);
307 }
308
309 /** emit warnings for IP in hosts */
310 static void
warn_hosts(const char * typ,struct config_stub * list)311 warn_hosts(const char* typ, struct config_stub* list)
312 {
313 struct sockaddr_storage a;
314 socklen_t alen;
315 struct config_stub* s;
316 struct config_strlist* h;
317 for(s=list; s; s=s->next) {
318 for(h=s->hosts; h; h=h->next) {
319 if(extstrtoaddr(h->str, &a, &alen, UNBOUND_DNS_PORT)) {
320 fprintf(stderr, "unbound-checkconf: warning:"
321 " %s %s: \"%s\" is an IP%s address, "
322 "and when looked up as a host name "
323 "during use may not resolve.\n",
324 s->name, typ, h->str,
325 addr_is_ip6(&a, alen)?"6":"4");
326 }
327 }
328 }
329 }
330
331 /** check interface strings */
332 static void
interfacechecks(struct config_file * cfg)333 interfacechecks(struct config_file* cfg)
334 {
335 int d;
336 struct sockaddr_storage a;
337 socklen_t alen;
338 int i, j, i2, j2;
339 char*** resif = NULL;
340 int* num_resif = NULL;
341 char portbuf[32];
342 snprintf(portbuf, sizeof(portbuf), "%d", cfg->port);
343
344 if(cfg->num_ifs != 0) {
345 resif = (char***)calloc(cfg->num_ifs, sizeof(char**));
346 if(!resif) fatal_exit("malloc failure");
347 num_resif = (int*)calloc(cfg->num_ifs, sizeof(int));
348 if(!num_resif) fatal_exit("malloc failure");
349 }
350 for(i=0; i<cfg->num_ifs; i++) {
351 /* search for duplicates in IP or ifname arguments */
352 for(i2=0; i2<i; i2++) {
353 if(strcmp(cfg->ifs[i], cfg->ifs[i2]) == 0) {
354 fatal_exit("interface: %s present twice, "
355 "cannot bind same ports twice.",
356 cfg->ifs[i]);
357 }
358 }
359 if(!resolve_interface_names(&cfg->ifs[i], 1, NULL, &resif[i],
360 &num_resif[i])) {
361 fatal_exit("could not resolve interface names, for %s",
362 cfg->ifs[i]);
363 }
364 /* check for port combinations that are not supported */
365 if(if_is_pp2(resif[i][0], portbuf, cfg->proxy_protocol_port)) {
366 if(if_is_dnscrypt(resif[i][0], portbuf,
367 cfg->dnscrypt_port)) {
368 fatal_exit("PROXYv2 and DNSCrypt combination not "
369 "supported!");
370 } else if(if_is_https(resif[i][0], portbuf,
371 cfg->https_port)) {
372 fatal_exit("PROXYv2 and DoH combination not "
373 "supported!");
374 }
375 }
376 /* search for duplicates in the returned addresses */
377 for(j=0; j<num_resif[i]; j++) {
378 if(!extstrtoaddr(resif[i][j], &a, &alen, cfg->port)) {
379 if(strcmp(cfg->ifs[i], resif[i][j]) != 0)
380 fatal_exit("cannot parse interface address '%s' from the interface specified as '%s'",
381 resif[i][j], cfg->ifs[i]);
382 else
383 fatal_exit("cannot parse interface specified as '%s'",
384 cfg->ifs[i]);
385 }
386 for(i2=0; i2<i; i2++) {
387 for(j2=0; j2<num_resif[i2]; j2++) {
388 if(strcmp(resif[i][j], resif[i2][j2])
389 == 0) {
390 char info1[1024], info2[1024];
391 if(strcmp(cfg->ifs[i], resif[i][j]) != 0)
392 snprintf(info1, sizeof(info1), "address %s from interface: %s", resif[i][j], cfg->ifs[i]);
393 else snprintf(info1, sizeof(info1), "interface: %s", cfg->ifs[i]);
394 if(strcmp(cfg->ifs[i2], resif[i2][j2]) != 0)
395 snprintf(info2, sizeof(info2), "address %s from interface: %s", resif[i2][j2], cfg->ifs[i2]);
396 else snprintf(info2, sizeof(info2), "interface: %s", cfg->ifs[i2]);
397 fatal_exit("%s present twice, cannot bind the same ports twice. The first entry is %s and the second is %s", resif[i][j], info2, info1);
398 }
399 }
400 }
401 }
402 }
403
404 for(i=0; i<cfg->num_ifs; i++) {
405 config_del_strarray(resif[i], num_resif[i]);
406 }
407 free(resif);
408 free(num_resif);
409
410 for(i=0; i<cfg->num_out_ifs; i++) {
411 if(!ipstrtoaddr(cfg->out_ifs[i], UNBOUND_DNS_PORT, &a, &alen) &&
412 !netblockstrtoaddr(cfg->out_ifs[i], UNBOUND_DNS_PORT, &a, &alen, &d)) {
413 fatal_exit("cannot parse outgoing-interface "
414 "specified as '%s'", cfg->out_ifs[i]);
415 }
416 for(j=0; j<cfg->num_out_ifs; j++) {
417 if(i!=j && strcmp(cfg->out_ifs[i], cfg->out_ifs[j])==0)
418 fatal_exit("outgoing-interface: %s present "
419 "twice, cannot bind same ports twice.",
420 cfg->out_ifs[i]);
421 }
422 }
423 }
424
425 /** check interface-automatic-ports */
426 static void
ifautomaticportschecks(char * ifautomaticports)427 ifautomaticportschecks(char* ifautomaticports)
428 {
429 char* now = ifautomaticports;
430 while(now && *now) {
431 char* after;
432 int extraport;
433 while(isspace((unsigned char)*now))
434 now++;
435 if(!*now)
436 break;
437 after = now;
438 extraport = (int)strtol(now, &after, 10);
439 if(extraport < 0 || extraport > 65535)
440 fatal_exit("interface-automatic-ports: port out of range at position %d in '%s'", (int)(now-ifautomaticports)+1, ifautomaticports);
441 if(extraport == 0 && now == after)
442 fatal_exit("interface-automatic-ports: parse error at position %d in '%s'", (int)(now-ifautomaticports)+1, ifautomaticports);
443 now = after;
444 }
445 }
446
447 /** check acl ips */
448 static void
aclchecks(struct config_file * cfg)449 aclchecks(struct config_file* cfg)
450 {
451 int d;
452 struct sockaddr_storage a;
453 socklen_t alen;
454 struct config_str2list* acl;
455 for(acl=cfg->acls; acl; acl = acl->next) {
456 if(!netblockstrtoaddr(acl->str, UNBOUND_DNS_PORT, &a, &alen,
457 &d)) {
458 fatal_exit("cannot parse access control address %s %s",
459 acl->str, acl->str2);
460 }
461 }
462 }
463
464 /** check tcp connection limit ips */
465 static void
tcpconnlimitchecks(struct config_file * cfg)466 tcpconnlimitchecks(struct config_file* cfg)
467 {
468 int d;
469 struct sockaddr_storage a;
470 socklen_t alen;
471 struct config_str2list* tcl;
472 for(tcl=cfg->tcp_connection_limits; tcl; tcl = tcl->next) {
473 if(!netblockstrtoaddr(tcl->str, UNBOUND_DNS_PORT, &a, &alen,
474 &d)) {
475 fatal_exit("cannot parse tcp connection limit address %s %s",
476 tcl->str, tcl->str2);
477 }
478 }
479 }
480
481 /** true if fname is a file */
482 static int
is_file(const char * fname)483 is_file(const char* fname)
484 {
485 struct stat buf;
486 if(stat(fname, &buf) < 0) {
487 if(errno==EACCES) {
488 printf("warning: no search permission for one of the directories in path: %s\n", fname);
489 return 1;
490 }
491 perror(fname);
492 return 0;
493 }
494 if(S_ISDIR(buf.st_mode)) {
495 printf("%s is not a file\n", fname);
496 return 0;
497 }
498 return 1;
499 }
500
501 /** true if fname is a directory */
502 static int
is_dir(const char * fname)503 is_dir(const char* fname)
504 {
505 struct stat buf;
506 if(stat(fname, &buf) < 0) {
507 if(errno==EACCES) {
508 printf("warning: no search permission for one of the directories in path: %s\n", fname);
509 return 1;
510 }
511 perror(fname);
512 return 0;
513 }
514 if(!(S_ISDIR(buf.st_mode))) {
515 printf("%s is not a directory\n", fname);
516 return 0;
517 }
518 return 1;
519 }
520
521 /** get base dir of a fname */
522 static char*
basedir(char * fname)523 basedir(char* fname)
524 {
525 char* rev;
526 if(!fname) fatal_exit("out of memory");
527 rev = strrchr(fname, '/');
528 if(!rev) return NULL;
529 if(fname == rev) return NULL;
530 rev[0] = 0;
531 return fname;
532 }
533
534 /** check chroot for a file string */
535 static void
check_chroot_string(const char * desc,char ** ss,const char * chrootdir,struct config_file * cfg)536 check_chroot_string(const char* desc, char** ss,
537 const char* chrootdir, struct config_file* cfg)
538 {
539 char* str = *ss;
540 if(str && str[0]) {
541 *ss = fname_after_chroot(str, cfg, 1);
542 if(!*ss) fatal_exit("out of memory");
543 if(!is_file(*ss)) {
544 if(chrootdir && chrootdir[0])
545 fatal_exit("%s: \"%s\" does not exist in "
546 "chrootdir %s", desc, str, chrootdir);
547 else
548 fatal_exit("%s: \"%s\" does not exist",
549 desc, str);
550 }
551 /* put in a new full path for continued checking */
552 free(str);
553 }
554 }
555
556 /** check file list, every file must be inside the chroot location */
557 static void
check_chroot_filelist(const char * desc,struct config_strlist * list,const char * chrootdir,struct config_file * cfg)558 check_chroot_filelist(const char* desc, struct config_strlist* list,
559 const char* chrootdir, struct config_file* cfg)
560 {
561 struct config_strlist* p;
562 for(p=list; p; p=p->next) {
563 check_chroot_string(desc, &p->str, chrootdir, cfg);
564 }
565 }
566
567 /** check file list, with wildcard processing */
568 static void
check_chroot_filelist_wild(const char * desc,struct config_strlist * list,const char * chrootdir,struct config_file * cfg)569 check_chroot_filelist_wild(const char* desc, struct config_strlist* list,
570 const char* chrootdir, struct config_file* cfg)
571 {
572 struct config_strlist* p;
573 for(p=list; p; p=p->next) {
574 #ifdef HAVE_GLOB
575 if(strchr(p->str, '*') || strchr(p->str, '[') ||
576 strchr(p->str, '?') || strchr(p->str, '{') ||
577 strchr(p->str, '~')) {
578 char* s = p->str;
579 /* adjust whole pattern for chroot and check later */
580 p->str = fname_after_chroot(p->str, cfg, 1);
581 free(s);
582 } else
583 #endif /* HAVE_GLOB */
584 check_chroot_string(desc, &p->str, chrootdir, cfg);
585 }
586 }
587
588 #ifdef CLIENT_SUBNET
589 /** check ECS configuration */
590 static void
ecs_conf_checks(struct config_file * cfg)591 ecs_conf_checks(struct config_file* cfg)
592 {
593 struct ecs_whitelist* whitelist = NULL;
594 if(!(whitelist = ecs_whitelist_create()))
595 fatal_exit("Could not create ednssubnet whitelist: out of memory");
596 if(!ecs_whitelist_apply_cfg(whitelist, cfg))
597 fatal_exit("Could not setup ednssubnet whitelist");
598 ecs_whitelist_delete(whitelist);
599 }
600 #endif /* CLIENT_SUBNET */
601
602 /** check that the modules exist, are compiled in */
603 static void
check_modules_exist(const char * module_conf)604 check_modules_exist(const char* module_conf)
605 {
606 const char** names = module_list_avail();
607 const char* s = module_conf;
608 while(*s) {
609 int i = 0;
610 int is_ok = 0;
611 while(*s && isspace((unsigned char)*s))
612 s++;
613 if(!*s) break;
614 while(names[i]) {
615 if(strncmp(names[i], s, strlen(names[i])) == 0) {
616 is_ok = 1;
617 break;
618 }
619 i++;
620 }
621 if(is_ok == 0) {
622 char n[64];
623 size_t j;
624 n[0]=0;
625 n[sizeof(n)-1]=0;
626 for(j=0; j<sizeof(n)-1; j++) {
627 if(!s[j] || isspace((unsigned char)s[j])) {
628 n[j] = 0;
629 break;
630 }
631 n[j] = s[j];
632 }
633 fatal_exit("module_conf lists module '%s' but that "
634 "module is not available.", n);
635 }
636 s += strlen(names[i]);
637 }
638 }
639
640 /** check configuration for errors */
641 static void
morechecks(struct config_file * cfg)642 morechecks(struct config_file* cfg)
643 {
644 warn_hosts("stub-host", cfg->stubs);
645 warn_hosts("forward-host", cfg->forwards);
646 interfacechecks(cfg);
647 ifautomaticportschecks(cfg->if_automatic_ports);
648 aclchecks(cfg);
649 tcpconnlimitchecks(cfg);
650
651 if(cfg->verbosity < 0)
652 fatal_exit("verbosity value < 0");
653 if(cfg->num_threads <= 0 || cfg->num_threads > 10000)
654 fatal_exit("num_threads value weird");
655 if(!cfg->do_ip4 && !cfg->do_ip6)
656 fatal_exit("ip4 and ip6 are both disabled, pointless");
657 if(!cfg->do_ip4 && cfg->prefer_ip4)
658 fatal_exit("cannot prefer and disable ip4, pointless");
659 if(!cfg->do_ip6 && cfg->prefer_ip6)
660 fatal_exit("cannot prefer and disable ip6, pointless");
661 if(!cfg->do_udp && !cfg->do_tcp)
662 fatal_exit("udp and tcp are both disabled, pointless");
663 if(cfg->edns_buffer_size > cfg->msg_buffer_size)
664 fatal_exit("edns-buffer-size larger than msg-buffer-size, "
665 "answers will not fit in processing buffer");
666 #ifdef UB_ON_WINDOWS
667 w_config_adjust_directory(cfg);
668 #endif
669 if(cfg->chrootdir && cfg->chrootdir[0] &&
670 cfg->chrootdir[strlen(cfg->chrootdir)-1] == '/')
671 fatal_exit("chootdir %s has trailing slash '/' please remove.",
672 cfg->chrootdir);
673 if(cfg->chrootdir && cfg->chrootdir[0] &&
674 !is_dir(cfg->chrootdir)) {
675 fatal_exit("bad chroot directory");
676 }
677 if(cfg->directory && cfg->directory[0]) {
678 char* ad = fname_after_chroot(cfg->directory, cfg, 0);
679 if(!ad) fatal_exit("out of memory");
680 if(!is_dir(ad)) fatal_exit("bad chdir directory");
681 free(ad);
682 }
683 if( (cfg->chrootdir && cfg->chrootdir[0]) ||
684 (cfg->directory && cfg->directory[0])) {
685 if(cfg->pidfile && cfg->pidfile[0]) {
686 char* ad = (cfg->pidfile[0]=='/')?strdup(cfg->pidfile):
687 fname_after_chroot(cfg->pidfile, cfg, 1);
688 char* bd = basedir(ad);
689 if(bd && !is_dir(bd))
690 fatal_exit("pidfile directory does not exist");
691 free(ad);
692 }
693 if(cfg->logfile && cfg->logfile[0]) {
694 char* ad = fname_after_chroot(cfg->logfile, cfg, 1);
695 char* bd = basedir(ad);
696 if(bd && !is_dir(bd))
697 fatal_exit("logfile directory does not exist");
698 free(ad);
699 }
700 }
701
702 check_chroot_filelist("file with root-hints",
703 cfg->root_hints, cfg->chrootdir, cfg);
704 check_chroot_filelist("trust-anchor-file",
705 cfg->trust_anchor_file_list, cfg->chrootdir, cfg);
706 check_chroot_filelist("auto-trust-anchor-file",
707 cfg->auto_trust_anchor_file_list, cfg->chrootdir, cfg);
708 check_chroot_filelist_wild("trusted-keys-file",
709 cfg->trusted_keys_file_list, cfg->chrootdir, cfg);
710 if(cfg->disable_edns_do && strstr(cfg->module_conf, "validator")
711 && (cfg->trust_anchor_file_list
712 || cfg->trust_anchor_list
713 || cfg->auto_trust_anchor_file_list
714 || cfg->trusted_keys_file_list)) {
715 char* key = NULL;
716 if(cfg->auto_trust_anchor_file_list)
717 key = cfg->auto_trust_anchor_file_list->str;
718 if(!key && cfg->trust_anchor_file_list)
719 key = cfg->trust_anchor_file_list->str;
720 if(!key && cfg->trust_anchor_list)
721 key = cfg->trust_anchor_list->str;
722 if(!key && cfg->trusted_keys_file_list)
723 key = cfg->trusted_keys_file_list->str;
724 if(!key) key = "";
725 fatal_exit("disable-edns-do does not allow DNSSEC to work, but the validator module uses a trust anchor %s, turn off disable-edns-do or disable validation", key);
726 }
727 #ifdef USE_IPSECMOD
728 if(cfg->ipsecmod_enabled && strstr(cfg->module_conf, "ipsecmod")) {
729 /* only check hook if enabled */
730 check_chroot_string("ipsecmod-hook", &cfg->ipsecmod_hook,
731 cfg->chrootdir, cfg);
732 }
733 #endif
734 /* remove chroot setting so that modules are not stripping pathnames */
735 free(cfg->chrootdir);
736 cfg->chrootdir = NULL;
737
738 /* check that the modules listed in module_conf exist */
739 check_modules_exist(cfg->module_conf);
740
741 /* Respip is known to *not* work with dns64. */
742 if(strcmp(cfg->module_conf, "iterator") != 0
743 && strcmp(cfg->module_conf, "validator iterator") != 0
744 && strcmp(cfg->module_conf, "dns64 validator iterator") != 0
745 && strcmp(cfg->module_conf, "dns64 iterator") != 0
746 && strcmp(cfg->module_conf, "respip iterator") != 0
747 && strcmp(cfg->module_conf, "respip validator iterator") != 0
748 && strcmp(cfg->module_conf, "respip dns64 validator iterator") != 0
749 && strcmp(cfg->module_conf, "respip dns64 iterator") != 0
750 #ifdef WITH_PYTHONMODULE
751 && strcmp(cfg->module_conf, "python iterator") != 0
752 && strcmp(cfg->module_conf, "python respip iterator") != 0
753 && strcmp(cfg->module_conf, "python validator iterator") != 0
754 && strcmp(cfg->module_conf, "python respip validator iterator") != 0
755 && strcmp(cfg->module_conf, "validator python iterator") != 0
756 && strcmp(cfg->module_conf, "dns64 python iterator") != 0
757 && strcmp(cfg->module_conf, "dns64 python validator iterator") != 0
758 && strcmp(cfg->module_conf, "dns64 validator python iterator") != 0
759 && strcmp(cfg->module_conf, "python dns64 iterator") != 0
760 && strcmp(cfg->module_conf, "python dns64 validator iterator") != 0
761 #endif
762 #ifdef WITH_DYNLIBMODULE
763 && strcmp(cfg->module_conf, "dynlib iterator") != 0
764 && strcmp(cfg->module_conf, "dynlib dynlib iterator") != 0
765 && strcmp(cfg->module_conf, "dynlib dynlib dynlib iterator") != 0
766 && strcmp(cfg->module_conf, "python dynlib iterator") != 0
767 && strcmp(cfg->module_conf, "python dynlib dynlib iterator") != 0
768 && strcmp(cfg->module_conf, "python dynlib dynlib dynlib iterator") != 0
769 && strcmp(cfg->module_conf, "dynlib respip iterator") != 0
770 && strcmp(cfg->module_conf, "dynlib validator iterator") != 0
771 && strcmp(cfg->module_conf, "dynlib dynlib validator iterator") != 0
772 && strcmp(cfg->module_conf, "dynlib dynlib dynlib validator iterator") != 0
773 && strcmp(cfg->module_conf, "python dynlib validator iterator") != 0
774 && strcmp(cfg->module_conf, "python dynlib dynlib validator iterator") != 0
775 && strcmp(cfg->module_conf, "python dynlib dynlib dynlib validator iterator") != 0
776 && strcmp(cfg->module_conf, "dynlib respip validator iterator") != 0
777 && strcmp(cfg->module_conf, "validator dynlib iterator") != 0
778 && strcmp(cfg->module_conf, "dns64 dynlib iterator") != 0
779 && strcmp(cfg->module_conf, "dns64 dynlib validator iterator") != 0
780 && strcmp(cfg->module_conf, "dns64 validator dynlib iterator") != 0
781 && strcmp(cfg->module_conf, "dynlib dns64 iterator") != 0
782 && strcmp(cfg->module_conf, "dynlib dns64 validator iterator") != 0
783 && strcmp(cfg->module_conf, "dynlib dns64 cachedb iterator") != 0
784 && strcmp(cfg->module_conf, "dynlib dns64 validator cachedb iterator") != 0
785 && strcmp(cfg->module_conf, "dns64 dynlib cachedb iterator") != 0
786 && strcmp(cfg->module_conf, "dns64 dynlib validator cachedb iterator") != 0
787 && strcmp(cfg->module_conf, "dynlib cachedb iterator") != 0
788 && strcmp(cfg->module_conf, "dynlib respip cachedb iterator") != 0
789 && strcmp(cfg->module_conf, "dynlib validator cachedb iterator") != 0
790 && strcmp(cfg->module_conf, "dynlib respip validator cachedb iterator") != 0
791 && strcmp(cfg->module_conf, "cachedb dynlib iterator") != 0
792 && strcmp(cfg->module_conf, "respip cachedb dynlib iterator") != 0
793 && strcmp(cfg->module_conf, "validator cachedb dynlib iterator") != 0
794 && strcmp(cfg->module_conf, "respip validator cachedb dynlib iterator") != 0
795 && strcmp(cfg->module_conf, "validator dynlib cachedb iterator") != 0
796 && strcmp(cfg->module_conf, "respip validator dynlib cachedb iterator") != 0
797 && strcmp(cfg->module_conf, "dynlib subnetcache iterator") != 0
798 && strcmp(cfg->module_conf, "dynlib respip subnetcache iterator") != 0
799 && strcmp(cfg->module_conf, "subnetcache dynlib iterator") != 0
800 && strcmp(cfg->module_conf, "respip subnetcache dynlib iterator") != 0
801 && strcmp(cfg->module_conf, "dynlib subnetcache validator iterator") != 0
802 && strcmp(cfg->module_conf, "dynlib respip subnetcache validator iterator") != 0
803 && strcmp(cfg->module_conf, "subnetcache dynlib validator iterator") != 0
804 && strcmp(cfg->module_conf, "respip subnetcache dynlib validator iterator") != 0
805 && strcmp(cfg->module_conf, "subnetcache validator dynlib iterator") != 0
806 && strcmp(cfg->module_conf, "respip subnetcache validator dynlib iterator") != 0
807 && strcmp(cfg->module_conf, "dynlib ipsecmod iterator") != 0
808 && strcmp(cfg->module_conf, "dynlib ipsecmod respip iterator") != 0
809 && strcmp(cfg->module_conf, "ipsecmod dynlib iterator") != 0
810 && strcmp(cfg->module_conf, "ipsecmod dynlib respip iterator") != 0
811 && strcmp(cfg->module_conf, "ipsecmod validator iterator") != 0
812 && strcmp(cfg->module_conf, "ipsecmod respip validator iterator") != 0
813 && strcmp(cfg->module_conf, "dynlib ipsecmod validator iterator") != 0
814 && strcmp(cfg->module_conf, "dynlib ipsecmod respip validator iterator") != 0
815 && strcmp(cfg->module_conf, "ipsecmod dynlib validator iterator") != 0
816 && strcmp(cfg->module_conf, "ipsecmod dynlib respip validator iterator") != 0
817 && strcmp(cfg->module_conf, "ipsecmod validator dynlib iterator") != 0
818 && strcmp(cfg->module_conf, "ipsecmod respip validator dynlib iterator") != 0
819 #endif
820 #ifdef USE_CACHEDB
821 && strcmp(cfg->module_conf, "validator cachedb iterator") != 0
822 && strcmp(cfg->module_conf, "respip validator cachedb iterator") != 0
823 && strcmp(cfg->module_conf, "cachedb iterator") != 0
824 && strcmp(cfg->module_conf, "respip cachedb iterator") != 0
825 && strcmp(cfg->module_conf, "dns64 validator cachedb iterator") != 0
826 && strcmp(cfg->module_conf, "dns64 cachedb iterator") != 0
827 #endif
828 #if defined(WITH_PYTHONMODULE) && defined(USE_CACHEDB)
829 && strcmp(cfg->module_conf, "python dns64 cachedb iterator") != 0
830 && strcmp(cfg->module_conf, "python dns64 validator cachedb iterator") != 0
831 && strcmp(cfg->module_conf, "dns64 python cachedb iterator") != 0
832 && strcmp(cfg->module_conf, "dns64 python validator cachedb iterator") != 0
833 && strcmp(cfg->module_conf, "python cachedb iterator") != 0
834 && strcmp(cfg->module_conf, "python respip cachedb iterator") != 0
835 && strcmp(cfg->module_conf, "python validator cachedb iterator") != 0
836 && strcmp(cfg->module_conf, "python respip validator cachedb iterator") != 0
837 && strcmp(cfg->module_conf, "cachedb python iterator") != 0
838 && strcmp(cfg->module_conf, "respip cachedb python iterator") != 0
839 && strcmp(cfg->module_conf, "validator cachedb python iterator") != 0
840 && strcmp(cfg->module_conf, "respip validator cachedb python iterator") != 0
841 && strcmp(cfg->module_conf, "validator python cachedb iterator") != 0
842 && strcmp(cfg->module_conf, "respip validator python cachedb iterator") != 0
843 #endif
844 #if defined(CLIENT_SUBNET) && defined(USE_CACHEDB)
845 && strcmp(cfg->module_conf, "respip subnetcache validator cachedb iterator") != 0
846 && strcmp(cfg->module_conf, "subnetcache validator cachedb iterator") != 0
847 #endif
848 #ifdef CLIENT_SUBNET
849 && strcmp(cfg->module_conf, "subnetcache iterator") != 0
850 && strcmp(cfg->module_conf, "respip subnetcache iterator") != 0
851 && strcmp(cfg->module_conf, "subnetcache validator iterator") != 0
852 && strcmp(cfg->module_conf, "respip subnetcache validator iterator") != 0
853 && strcmp(cfg->module_conf, "dns64 subnetcache iterator") != 0
854 && strcmp(cfg->module_conf, "dns64 subnetcache validator iterator") != 0
855 && strcmp(cfg->module_conf, "dns64 subnetcache respip iterator") != 0
856 && strcmp(cfg->module_conf, "dns64 subnetcache respip validator iterator") != 0
857 #endif
858 #if defined(WITH_PYTHONMODULE) && defined(CLIENT_SUBNET)
859 && strcmp(cfg->module_conf, "python subnetcache iterator") != 0
860 && strcmp(cfg->module_conf, "python respip subnetcache iterator") != 0
861 && strcmp(cfg->module_conf, "subnetcache python iterator") != 0
862 && strcmp(cfg->module_conf, "respip subnetcache python iterator") != 0
863 && strcmp(cfg->module_conf, "python subnetcache validator iterator") != 0
864 && strcmp(cfg->module_conf, "python respip subnetcache validator iterator") != 0
865 && strcmp(cfg->module_conf, "subnetcache python validator iterator") != 0
866 && strcmp(cfg->module_conf, "respip subnetcache python validator iterator") != 0
867 && strcmp(cfg->module_conf, "subnetcache validator python iterator") != 0
868 && strcmp(cfg->module_conf, "respip subnetcache validator python iterator") != 0
869 #endif
870 #ifdef USE_IPSECMOD
871 && strcmp(cfg->module_conf, "ipsecmod iterator") != 0
872 && strcmp(cfg->module_conf, "ipsecmod respip iterator") != 0
873 && strcmp(cfg->module_conf, "ipsecmod validator iterator") != 0
874 && strcmp(cfg->module_conf, "ipsecmod respip validator iterator") != 0
875 #endif
876 #if defined(WITH_PYTHONMODULE) && defined(USE_IPSECMOD)
877 && strcmp(cfg->module_conf, "python ipsecmod iterator") != 0
878 && strcmp(cfg->module_conf, "python ipsecmod respip iterator") != 0
879 && strcmp(cfg->module_conf, "ipsecmod python iterator") != 0
880 && strcmp(cfg->module_conf, "ipsecmod python respip iterator") != 0
881 && strcmp(cfg->module_conf, "ipsecmod validator iterator") != 0
882 && strcmp(cfg->module_conf, "ipsecmod respip validator iterator") != 0
883 && strcmp(cfg->module_conf, "python ipsecmod validator iterator") != 0
884 && strcmp(cfg->module_conf, "python ipsecmod respip validator iterator") != 0
885 && strcmp(cfg->module_conf, "ipsecmod python validator iterator") != 0
886 && strcmp(cfg->module_conf, "ipsecmod python respip validator iterator") != 0
887 && strcmp(cfg->module_conf, "ipsecmod validator python iterator") != 0
888 && strcmp(cfg->module_conf, "ipsecmod respip validator python iterator") != 0
889 #endif
890 #ifdef USE_IPSET
891 && strcmp(cfg->module_conf, "validator ipset iterator") != 0
892 && strcmp(cfg->module_conf, "validator ipset respip iterator") != 0
893 && strcmp(cfg->module_conf, "ipset iterator") != 0
894 && strcmp(cfg->module_conf, "ipset respip iterator") != 0
895 #endif
896 ) {
897 fatal_exit("module conf '%s' is not known to work",
898 cfg->module_conf);
899 }
900
901 #ifdef HAVE_GETPWNAM
902 if(cfg->username && cfg->username[0]) {
903 if(getpwnam(cfg->username) == NULL)
904 fatal_exit("user '%s' does not exist.", cfg->username);
905 # ifdef HAVE_ENDPWENT
906 endpwent();
907 # endif
908 }
909
910 if (pledge("stdio rpath", NULL) == -1)
911 fatal_exit("Could not pledge");
912
913 #endif
914 if(cfg->remote_control_enable && options_remote_is_address(cfg)
915 && cfg->control_use_cert) {
916 check_chroot_string("server-key-file", &cfg->server_key_file,
917 cfg->chrootdir, cfg);
918 check_chroot_string("server-cert-file", &cfg->server_cert_file,
919 cfg->chrootdir, cfg);
920 if(!is_file(cfg->control_key_file))
921 fatal_exit("control-key-file: \"%s\" does not exist",
922 cfg->control_key_file);
923 if(!is_file(cfg->control_cert_file))
924 fatal_exit("control-cert-file: \"%s\" does not exist",
925 cfg->control_cert_file);
926 }
927
928 donotquerylocalhostcheck(cfg);
929 localzonechecks(cfg);
930 view_and_respipchecks(cfg);
931 #ifdef CLIENT_SUBNET
932 ecs_conf_checks(cfg);
933 #endif
934 }
935
936 /** check forwards */
937 static void
check_fwd(struct config_file * cfg)938 check_fwd(struct config_file* cfg)
939 {
940 struct iter_forwards* fwd = forwards_create();
941 if(!fwd || !forwards_apply_cfg(fwd, cfg)) {
942 fatal_exit("Could not set forward zones");
943 }
944 forwards_delete(fwd);
945 }
946
947 /** check hints */
948 static void
check_hints(struct config_file * cfg)949 check_hints(struct config_file* cfg)
950 {
951 struct iter_hints* hints = hints_create();
952 if(!hints || !hints_apply_cfg(hints, cfg)) {
953 fatal_exit("Could not set root or stub hints");
954 }
955 hints_delete(hints);
956 }
957
958 /** check auth zones */
959 static void
check_auth(struct config_file * cfg)960 check_auth(struct config_file* cfg)
961 {
962 int is_rpz = 0;
963 struct auth_zones* az = auth_zones_create();
964 if(!az || !auth_zones_apply_cfg(az, cfg, 0, &is_rpz, NULL, NULL)) {
965 fatal_exit("Could not setup authority zones");
966 }
967 auth_zones_delete(az);
968 }
969
970 /** check config file */
971 static void
checkconf(const char * cfgfile,const char * opt,int final)972 checkconf(const char* cfgfile, const char* opt, int final)
973 {
974 char oldwd[4096];
975 struct config_file* cfg = config_create();
976 if(!cfg)
977 fatal_exit("out of memory");
978 oldwd[0] = 0;
979 if(!getcwd(oldwd, sizeof(oldwd))) {
980 log_err("cannot getcwd: %s", strerror(errno));
981 oldwd[0] = 0;
982 }
983 if(!config_read(cfg, cfgfile, NULL)) {
984 /* config_read prints messages to stderr */
985 config_delete(cfg);
986 exit(1);
987 }
988 if(oldwd[0] && chdir(oldwd) == -1)
989 log_err("cannot chdir(%s): %s", oldwd, strerror(errno));
990 if(opt) {
991 print_option(cfg, opt, final);
992 config_delete(cfg);
993 return;
994 }
995 morechecks(cfg);
996 check_mod(cfg, iter_get_funcblock());
997 check_mod(cfg, val_get_funcblock());
998 #ifdef WITH_PYTHONMODULE
999 if(strstr(cfg->module_conf, "python"))
1000 check_mod(cfg, pythonmod_get_funcblock());
1001 #endif
1002 check_fwd(cfg);
1003 check_hints(cfg);
1004 check_auth(cfg);
1005 printf("unbound-checkconf: no errors in %s\n", cfgfile);
1006 config_delete(cfg);
1007 }
1008
1009 /** getopt global, in case header files fail to declare it. */
1010 extern int optind;
1011 /** getopt global, in case header files fail to declare it. */
1012 extern char* optarg;
1013
1014 /** Main routine for checkconf */
main(int argc,char * argv[])1015 int main(int argc, char* argv[])
1016 {
1017 int c;
1018 int final = 0;
1019 const char* f;
1020 const char* opt = NULL;
1021 const char* cfgfile = CONFIGFILE;
1022 checklock_start();
1023 log_ident_set("unbound-checkconf");
1024 log_init(NULL, 0, NULL);
1025 #ifdef USE_WINSOCK
1026 /* use registry config file in preference to compiletime location */
1027 if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
1028 cfgfile = CONFIGFILE;
1029 #endif /* USE_WINSOCK */
1030 /* parse the options */
1031 while( (c=getopt(argc, argv, "fho:")) != -1) {
1032 switch(c) {
1033 case 'f':
1034 final = 1;
1035 break;
1036 case 'o':
1037 opt = optarg;
1038 break;
1039 case '?':
1040 case 'h':
1041 default:
1042 usage();
1043 }
1044 }
1045 argc -= optind;
1046 argv += optind;
1047 if(argc != 0 && argc != 1)
1048 usage();
1049 if(argc == 1)
1050 f = argv[0];
1051 else f = cfgfile;
1052
1053 if (pledge("stdio rpath dns getpw", NULL) == -1)
1054 fatal_exit("Could not pledge");
1055
1056 checkconf(f, opt, final);
1057 checklock_stop();
1058 return 0;
1059 }
1060