dnssectool.c revision 1.9 1 /* $NetBSD: dnssectool.c,v 1.9 2024/02/21 22:51:03 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * SPDX-License-Identifier: MPL-2.0
7 *
8 * This Source Code Form is subject to the terms of the Mozilla Public
9 * License, v. 2.0. If a copy of the MPL was not distributed with this
10 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
11 *
12 * See the COPYRIGHT file distributed with this work for additional
13 * information regarding copyright ownership.
14 */
15
16 /*! \file */
17
18 /*%
19 * DNSSEC Support Routines.
20 */
21
22 #include <inttypes.h>
23 #include <stdbool.h>
24 #include <stdlib.h>
25
26 #include <isc/base32.h>
27 #include <isc/buffer.h>
28 #include <isc/commandline.h>
29 #include <isc/dir.h>
30 #include <isc/file.h>
31 #include <isc/heap.h>
32 #include <isc/list.h>
33 #include <isc/mem.h>
34 #include <isc/print.h>
35 #include <isc/result.h>
36 #include <isc/string.h>
37 #include <isc/time.h>
38 #include <isc/tm.h>
39 #include <isc/util.h>
40
41 #include <dns/db.h>
42 #include <dns/dbiterator.h>
43 #include <dns/dnssec.h>
44 #include <dns/fixedname.h>
45 #include <dns/keyvalues.h>
46 #include <dns/log.h>
47 #include <dns/name.h>
48 #include <dns/nsec.h>
49 #include <dns/nsec3.h>
50 #include <dns/rdataclass.h>
51 #include <dns/rdataset.h>
52 #include <dns/rdatasetiter.h>
53 #include <dns/rdatastruct.h>
54 #include <dns/rdatatype.h>
55 #include <dns/secalg.h>
56 #include <dns/time.h>
57
58 #include "dnssectool.h"
59
60 #define KEYSTATES_NVALUES 4
61 static const char *keystates[KEYSTATES_NVALUES] = {
62 "hidden",
63 "rumoured",
64 "omnipresent",
65 "unretentive",
66 };
67
68 int verbose = 0;
69 bool quiet = false;
70 dns_dsdigest_t dtype[8];
71
72 static fatalcallback_t *fatalcallback = NULL;
73
74 void
75 fatal(const char *format, ...) {
76 va_list args;
77
78 fprintf(stderr, "%s: fatal: ", program);
79 va_start(args, format);
80 vfprintf(stderr, format, args);
81 va_end(args);
82 fprintf(stderr, "\n");
83 if (fatalcallback != NULL) {
84 (*fatalcallback)();
85 }
86 exit(1);
87 }
88
89 void
90 setfatalcallback(fatalcallback_t *callback) {
91 fatalcallback = callback;
92 }
93
94 void
95 check_result(isc_result_t result, const char *message) {
96 if (result != ISC_R_SUCCESS) {
97 fatal("%s: %s", message, isc_result_totext(result));
98 }
99 }
100
101 void
102 vbprintf(int level, const char *fmt, ...) {
103 va_list ap;
104 if (level > verbose) {
105 return;
106 }
107 va_start(ap, fmt);
108 fprintf(stderr, "%s: ", program);
109 vfprintf(stderr, fmt, ap);
110 va_end(ap);
111 }
112
113 void
114 version(const char *name) {
115 fprintf(stderr, "%s %s\n", name, PACKAGE_VERSION);
116 exit(0);
117 }
118
119 void
120 sig_format(dns_rdata_rrsig_t *sig, char *cp, unsigned int size) {
121 char namestr[DNS_NAME_FORMATSIZE];
122 char algstr[DNS_NAME_FORMATSIZE];
123
124 dns_name_format(&sig->signer, namestr, sizeof(namestr));
125 dns_secalg_format(sig->algorithm, algstr, sizeof(algstr));
126 snprintf(cp, size, "%s/%s/%d", namestr, algstr, sig->keyid);
127 }
128
129 void
130 setup_logging(isc_mem_t *mctx, isc_log_t **logp) {
131 isc_logdestination_t destination;
132 isc_logconfig_t *logconfig = NULL;
133 isc_log_t *log = NULL;
134 int level;
135
136 if (verbose < 0) {
137 verbose = 0;
138 }
139 switch (verbose) {
140 case 0:
141 /*
142 * We want to see warnings about things like out-of-zone
143 * data in the master file even when not verbose.
144 */
145 level = ISC_LOG_WARNING;
146 break;
147 case 1:
148 level = ISC_LOG_INFO;
149 break;
150 default:
151 level = ISC_LOG_DEBUG(verbose - 2 + 1);
152 break;
153 }
154
155 isc_log_create(mctx, &log, &logconfig);
156 isc_log_setcontext(log);
157 dns_log_init(log);
158 dns_log_setcontext(log);
159 isc_log_settag(logconfig, program);
160
161 /*
162 * Set up a channel similar to default_stderr except:
163 * - the logging level is passed in
164 * - the program name and logging level are printed
165 * - no time stamp is printed
166 */
167 destination.file.stream = stderr;
168 destination.file.name = NULL;
169 destination.file.versions = ISC_LOG_ROLLNEVER;
170 destination.file.maximum_size = 0;
171 isc_log_createchannel(logconfig, "stderr", ISC_LOG_TOFILEDESC, level,
172 &destination,
173 ISC_LOG_PRINTTAG | ISC_LOG_PRINTLEVEL);
174
175 RUNTIME_CHECK(isc_log_usechannel(logconfig, "stderr", NULL, NULL) ==
176 ISC_R_SUCCESS);
177
178 *logp = log;
179 }
180
181 void
182 cleanup_logging(isc_log_t **logp) {
183 isc_log_t *log;
184
185 REQUIRE(logp != NULL);
186
187 log = *logp;
188 *logp = NULL;
189
190 if (log == NULL) {
191 return;
192 }
193
194 isc_log_destroy(&log);
195 isc_log_setcontext(NULL);
196 dns_log_setcontext(NULL);
197 }
198
199 static isc_stdtime_t
200 time_units(isc_stdtime_t offset, char *suffix, const char *str) {
201 switch (suffix[0]) {
202 case 'Y':
203 case 'y':
204 return (offset * (365 * 24 * 3600));
205 case 'M':
206 case 'm':
207 switch (suffix[1]) {
208 case 'O':
209 case 'o':
210 return (offset * (30 * 24 * 3600));
211 case 'I':
212 case 'i':
213 return (offset * 60);
214 case '\0':
215 fatal("'%s' ambiguous: use 'mi' for minutes "
216 "or 'mo' for months",
217 str);
218 default:
219 fatal("time value %s is invalid", str);
220 }
221 UNREACHABLE();
222 break;
223 case 'W':
224 case 'w':
225 return (offset * (7 * 24 * 3600));
226 case 'D':
227 case 'd':
228 return (offset * (24 * 3600));
229 case 'H':
230 case 'h':
231 return (offset * 3600);
232 case 'S':
233 case 's':
234 case '\0':
235 return (offset);
236 default:
237 fatal("time value %s is invalid", str);
238 }
239 UNREACHABLE();
240 return (0); /* silence compiler warning */
241 }
242
243 static bool
244 isnone(const char *str) {
245 return ((strcasecmp(str, "none") == 0) ||
246 (strcasecmp(str, "never") == 0) ||
247 (strcasecmp(str, "unset") == 0));
248 }
249
250 dns_ttl_t
251 strtottl(const char *str) {
252 const char *orig = str;
253 dns_ttl_t ttl;
254 char *endp;
255
256 if (isnone(str)) {
257 return ((dns_ttl_t)0);
258 }
259
260 ttl = strtol(str, &endp, 0);
261 if (ttl == 0 && endp == str) {
262 fatal("TTL must be numeric");
263 }
264 ttl = time_units(ttl, endp, orig);
265 return (ttl);
266 }
267
268 dst_key_state_t
269 strtokeystate(const char *str) {
270 if (isnone(str)) {
271 return (DST_KEY_STATE_NA);
272 }
273
274 for (int i = 0; i < KEYSTATES_NVALUES; i++) {
275 if (keystates[i] != NULL && strcasecmp(str, keystates[i]) == 0)
276 {
277 return ((dst_key_state_t)i);
278 }
279 }
280 fatal("unknown key state %s", str);
281 }
282
283 isc_stdtime_t
284 strtotime(const char *str, int64_t now, int64_t base, bool *setp) {
285 int64_t val, offset;
286 isc_result_t result;
287 const char *orig = str;
288 char *endp;
289 size_t n;
290 struct tm tm;
291
292 if (isnone(str)) {
293 if (setp != NULL) {
294 *setp = false;
295 }
296 return ((isc_stdtime_t)0);
297 }
298
299 if (setp != NULL) {
300 *setp = true;
301 }
302
303 if ((str[0] == '0' || str[0] == '-') && str[1] == '\0') {
304 return ((isc_stdtime_t)0);
305 }
306
307 /*
308 * We accept times in the following formats:
309 * now([+-]offset)
310 * YYYYMMDD([+-]offset)
311 * YYYYMMDDhhmmss([+-]offset)
312 * Day Mon DD HH:MM:SS YYYY([+-]offset)
313 * 1234567890([+-]offset)
314 * [+-]offset
315 */
316 n = strspn(str, "0123456789");
317 if ((n == 8u || n == 14u) &&
318 (str[n] == '\0' || str[n] == '-' || str[n] == '+'))
319 {
320 char timestr[15];
321
322 strlcpy(timestr, str, sizeof(timestr));
323 timestr[n] = 0;
324 if (n == 8u) {
325 strlcat(timestr, "000000", sizeof(timestr));
326 }
327 result = dns_time64_fromtext(timestr, &val);
328 if (result != ISC_R_SUCCESS) {
329 fatal("time value %s is invalid: %s", orig,
330 isc_result_totext(result));
331 }
332 base = val;
333 str += n;
334 } else if (n == 10u &&
335 (str[n] == '\0' || str[n] == '-' || str[n] == '+'))
336 {
337 base = strtoll(str, &endp, 0);
338 str += 10;
339 } else if (strncmp(str, "now", 3) == 0) {
340 base = now;
341 str += 3;
342 } else if (str[0] >= 'A' && str[0] <= 'Z') {
343 /* parse ctime() format as written by `dnssec-settime -p` */
344 endp = isc_tm_strptime(str, "%a %b %d %H:%M:%S %Y", &tm);
345 if (endp != str + 24) {
346 fatal("time value %s is invalid", orig);
347 }
348 base = mktime(&tm);
349 str += 24;
350 }
351
352 if (str[0] == '\0') {
353 return ((isc_stdtime_t)base);
354 } else if (str[0] == '+') {
355 offset = strtol(str + 1, &endp, 0);
356 offset = time_units((isc_stdtime_t)offset, endp, orig);
357 val = base + offset;
358 } else if (str[0] == '-') {
359 offset = strtol(str + 1, &endp, 0);
360 offset = time_units((isc_stdtime_t)offset, endp, orig);
361 val = base - offset;
362 } else {
363 fatal("time value %s is invalid", orig);
364 }
365
366 return ((isc_stdtime_t)val);
367 }
368
369 dns_rdataclass_t
370 strtoclass(const char *str) {
371 isc_textregion_t r;
372 dns_rdataclass_t rdclass;
373 isc_result_t result;
374
375 if (str == NULL) {
376 return (dns_rdataclass_in);
377 }
378 DE_CONST(str, r.base);
379 r.length = strlen(str);
380 result = dns_rdataclass_fromtext(&rdclass, &r);
381 if (result != ISC_R_SUCCESS) {
382 fatal("unknown class %s", str);
383 }
384 return (rdclass);
385 }
386
387 unsigned int
388 strtodsdigest(const char *str) {
389 isc_textregion_t r;
390 dns_dsdigest_t alg;
391 isc_result_t result;
392
393 DE_CONST(str, r.base);
394 r.length = strlen(str);
395 result = dns_dsdigest_fromtext(&alg, &r);
396 if (result != ISC_R_SUCCESS) {
397 fatal("unknown DS algorithm %s", str);
398 }
399 return (alg);
400 }
401
402 static int
403 cmp_dtype(const void *ap, const void *bp) {
404 int a = *(const uint8_t *)ap;
405 int b = *(const uint8_t *)bp;
406 return (a - b);
407 }
408
409 void
410 add_dtype(unsigned int dt) {
411 unsigned i, n;
412
413 /* ensure there is space for a zero terminator */
414 n = sizeof(dtype) / sizeof(dtype[0]) - 1;
415 for (i = 0; i < n; i++) {
416 if (dtype[i] == dt) {
417 return;
418 }
419 if (dtype[i] == 0) {
420 dtype[i] = dt;
421 qsort(dtype, i + 1, 1, cmp_dtype);
422 return;
423 }
424 }
425 fatal("too many -a digest type arguments");
426 }
427
428 isc_result_t
429 try_dir(const char *dirname) {
430 isc_result_t result;
431 isc_dir_t d;
432
433 isc_dir_init(&d);
434 result = isc_dir_open(&d, dirname);
435 if (result == ISC_R_SUCCESS) {
436 isc_dir_close(&d);
437 }
438 return (result);
439 }
440
441 /*
442 * Check private key version compatibility.
443 */
444 void
445 check_keyversion(dst_key_t *key, char *keystr) {
446 int major, minor;
447 dst_key_getprivateformat(key, &major, &minor);
448 INSIST(major <= DST_MAJOR_VERSION); /* invalid private key */
449
450 if (major < DST_MAJOR_VERSION || minor < DST_MINOR_VERSION) {
451 fatal("Key %s has incompatible format version %d.%d, "
452 "use -f to force upgrade to new version.",
453 keystr, major, minor);
454 }
455 if (minor > DST_MINOR_VERSION) {
456 fatal("Key %s has incompatible format version %d.%d, "
457 "use -f to force downgrade to current version.",
458 keystr, major, minor);
459 }
460 }
461
462 void
463 set_keyversion(dst_key_t *key) {
464 int major, minor;
465 dst_key_getprivateformat(key, &major, &minor);
466 INSIST(major <= DST_MAJOR_VERSION);
467
468 if (major != DST_MAJOR_VERSION || minor != DST_MINOR_VERSION) {
469 dst_key_setprivateformat(key, DST_MAJOR_VERSION,
470 DST_MINOR_VERSION);
471 }
472
473 /*
474 * If the key is from a version older than 1.3, set
475 * set the creation date
476 */
477 if (major < 1 || (major == 1 && minor <= 2)) {
478 isc_stdtime_t now;
479 isc_stdtime_get(&now);
480 dst_key_settime(key, DST_TIME_CREATED, now);
481 }
482 }
483
484 bool
485 key_collision(dst_key_t *dstkey, dns_name_t *name, const char *dir,
486 isc_mem_t *mctx, bool *exact) {
487 isc_result_t result;
488 bool conflict = false;
489 dns_dnsseckeylist_t matchkeys;
490 dns_dnsseckey_t *key = NULL;
491 uint16_t id, oldid;
492 uint32_t rid, roldid;
493 dns_secalg_t alg;
494 char filename[NAME_MAX];
495 isc_buffer_t fileb;
496 isc_stdtime_t now;
497
498 if (exact != NULL) {
499 *exact = false;
500 }
501
502 id = dst_key_id(dstkey);
503 rid = dst_key_rid(dstkey);
504 alg = dst_key_alg(dstkey);
505
506 /*
507 * For Diffie Hellman just check if there is a direct collision as
508 * they can't be revoked. Additionally dns_dnssec_findmatchingkeys
509 * only handles DNSKEY which is not used for HMAC.
510 */
511 if (alg == DST_ALG_DH) {
512 isc_buffer_init(&fileb, filename, sizeof(filename));
513 result = dst_key_buildfilename(dstkey, DST_TYPE_PRIVATE, dir,
514 &fileb);
515 if (result != ISC_R_SUCCESS) {
516 return (true);
517 }
518 return (isc_file_exists(filename));
519 }
520
521 ISC_LIST_INIT(matchkeys);
522 isc_stdtime_get(&now);
523 result = dns_dnssec_findmatchingkeys(name, dir, now, mctx, &matchkeys);
524 if (result == ISC_R_NOTFOUND) {
525 return (false);
526 }
527
528 while (!ISC_LIST_EMPTY(matchkeys) && !conflict) {
529 key = ISC_LIST_HEAD(matchkeys);
530 if (dst_key_alg(key->key) != alg) {
531 goto next;
532 }
533
534 oldid = dst_key_id(key->key);
535 roldid = dst_key_rid(key->key);
536
537 if (oldid == rid || roldid == id || id == oldid) {
538 conflict = true;
539 if (id != oldid) {
540 if (verbose > 1) {
541 fprintf(stderr,
542 "Key ID %d could "
543 "collide with %d\n",
544 id, oldid);
545 }
546 } else {
547 if (exact != NULL) {
548 *exact = true;
549 }
550 if (verbose > 1) {
551 fprintf(stderr, "Key ID %d exists\n",
552 id);
553 }
554 }
555 }
556
557 next:
558 ISC_LIST_UNLINK(matchkeys, key, link);
559 dns_dnsseckey_destroy(mctx, &key);
560 }
561
562 /* Finish freeing the list */
563 while (!ISC_LIST_EMPTY(matchkeys)) {
564 key = ISC_LIST_HEAD(matchkeys);
565 ISC_LIST_UNLINK(matchkeys, key, link);
566 dns_dnsseckey_destroy(mctx, &key);
567 }
568
569 return (conflict);
570 }
571
572 bool
573 isoptarg(const char *arg, char **argv, void (*usage)(void)) {
574 if (!strcasecmp(isc_commandline_argument, arg)) {
575 if (argv[isc_commandline_index] == NULL) {
576 fprintf(stderr, "%s: missing argument -%c %s\n",
577 program, isc_commandline_option,
578 isc_commandline_argument);
579 usage();
580 }
581 isc_commandline_argument = argv[isc_commandline_index];
582 /* skip to next argument */
583 isc_commandline_index++;
584 return (true);
585 }
586 return (false);
587 }
588