dnssec-dsfromkey.c revision 1.1.1.13 1 /* $NetBSD: dnssec-dsfromkey.c,v 1.1.1.13 2026/01/29 18:19:38 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 #include <inttypes.h>
19 #include <stdbool.h>
20 #include <stdlib.h>
21
22 #include <isc/attributes.h>
23 #include <isc/buffer.h>
24 #include <isc/commandline.h>
25 #include <isc/dir.h>
26 #include <isc/hash.h>
27 #include <isc/mem.h>
28 #include <isc/result.h>
29 #include <isc/string.h>
30 #include <isc/urcu.h>
31 #include <isc/util.h>
32
33 #include <dns/callbacks.h>
34 #include <dns/db.h>
35 #include <dns/dbiterator.h>
36 #include <dns/ds.h>
37 #include <dns/fixedname.h>
38 #include <dns/keyvalues.h>
39 #include <dns/log.h>
40 #include <dns/master.h>
41 #include <dns/name.h>
42 #include <dns/rdata.h>
43 #include <dns/rdataclass.h>
44 #include <dns/rdataset.h>
45 #include <dns/rdatasetiter.h>
46 #include <dns/rdatatype.h>
47
48 #include <dst/dst.h>
49
50 #include "dnssectool.h"
51
52 const char *program = "dnssec-dsfromkey";
53
54 static dns_rdataclass_t rdclass;
55 static dns_fixedname_t fixed;
56 static dns_name_t *name = NULL;
57 static isc_mem_t *mctx = NULL;
58 static uint32_t ttl;
59 static bool emitttl = false;
60 static unsigned int split_width = 0;
61
62 static isc_result_t
63 initname(char *setname) {
64 isc_result_t result;
65 isc_buffer_t buf;
66
67 name = dns_fixedname_initname(&fixed);
68
69 isc_buffer_init(&buf, setname, strlen(setname));
70 isc_buffer_add(&buf, strlen(setname));
71 result = dns_name_fromtext(name, &buf, dns_rootname, 0, NULL);
72 return result;
73 }
74
75 static void
76 db_load_from_stream(dns_db_t *db, FILE *fp) {
77 isc_result_t result;
78 dns_rdatacallbacks_t callbacks;
79
80 dns_rdatacallbacks_init(&callbacks);
81 result = dns_db_beginload(db, &callbacks);
82 if (result != ISC_R_SUCCESS) {
83 fatal("dns_db_beginload failed: %s", isc_result_totext(result));
84 }
85
86 result = dns_master_loadstream(fp, name, name, rdclass, 0, &callbacks,
87 mctx);
88 if (result != ISC_R_SUCCESS) {
89 fatal("can't load from input: %s", isc_result_totext(result));
90 }
91
92 result = dns_db_endload(db, &callbacks);
93 if (result != ISC_R_SUCCESS) {
94 fatal("dns_db_endload failed: %s", isc_result_totext(result));
95 }
96 }
97
98 static isc_result_t
99 loadset(const char *filename, dns_rdataset_t *rdataset) {
100 isc_result_t result;
101 dns_db_t *db = NULL;
102 dns_dbnode_t *node = NULL;
103 char setname[DNS_NAME_FORMATSIZE];
104
105 dns_name_format(name, setname, sizeof(setname));
106
107 result = dns_db_create(mctx, ZONEDB_DEFAULT, name, dns_dbtype_zone,
108 rdclass, 0, NULL, &db);
109 if (result != ISC_R_SUCCESS) {
110 fatal("can't create database");
111 }
112
113 if (strcmp(filename, "-") == 0) {
114 db_load_from_stream(db, stdin);
115 filename = "input";
116 } else {
117 result = dns_db_load(db, filename, dns_masterformat_text, 0);
118 if (result != ISC_R_SUCCESS && result != DNS_R_SEENINCLUDE) {
119 fatal("can't load %s: %s", filename,
120 isc_result_totext(result));
121 }
122 }
123
124 result = dns_db_findnode(db, name, false, &node);
125 if (result != ISC_R_SUCCESS) {
126 fatal("can't find %s node in %s", setname, filename);
127 }
128
129 result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_dnskey, 0, 0,
130 rdataset, NULL);
131
132 if (result == ISC_R_NOTFOUND) {
133 fatal("no DNSKEY RR for %s in %s", setname, filename);
134 } else if (result != ISC_R_SUCCESS) {
135 fatal("dns_db_findrdataset");
136 }
137
138 if (node != NULL) {
139 dns_db_detachnode(db, &node);
140 }
141 if (db != NULL) {
142 dns_db_detach(&db);
143 }
144 return result;
145 }
146
147 static isc_result_t
148 loadkeyset(char *dirname, dns_rdataset_t *rdataset) {
149 isc_result_t result;
150 char filename[PATH_MAX + 1];
151 isc_buffer_t buf;
152
153 dns_rdataset_init(rdataset);
154
155 isc_buffer_init(&buf, filename, sizeof(filename));
156 if (dirname != NULL) {
157 /* allow room for a trailing slash */
158 if (strlen(dirname) >= isc_buffer_availablelength(&buf)) {
159 return ISC_R_NOSPACE;
160 }
161 isc_buffer_putstr(&buf, dirname);
162 if (dirname[strlen(dirname) - 1] != '/') {
163 isc_buffer_putstr(&buf, "/");
164 }
165 }
166
167 if (isc_buffer_availablelength(&buf) < 7) {
168 return ISC_R_NOSPACE;
169 }
170 isc_buffer_putstr(&buf, "keyset-");
171
172 result = dns_name_tofilenametext(name, false, &buf);
173 check_result(result, "dns_name_tofilenametext()");
174 if (isc_buffer_availablelength(&buf) == 0) {
175 return ISC_R_NOSPACE;
176 }
177 isc_buffer_putuint8(&buf, 0);
178
179 return loadset(filename, rdataset);
180 }
181
182 static void
183 loadkey(char *filename, unsigned char *key_buf, unsigned int key_buf_size,
184 dns_rdata_t *rdata) {
185 isc_result_t result;
186 dst_key_t *key = NULL;
187 isc_buffer_t keyb;
188 isc_region_t r;
189
190 dns_rdata_init(rdata);
191
192 isc_buffer_init(&keyb, key_buf, key_buf_size);
193
194 result = dst_key_fromnamedfile(filename, NULL, DST_TYPE_PUBLIC, mctx,
195 &key);
196 if (result != ISC_R_SUCCESS) {
197 fatal("can't load %s.key: %s", filename,
198 isc_result_totext(result));
199 }
200
201 if (verbose > 2) {
202 char keystr[DST_KEY_FORMATSIZE];
203
204 dst_key_format(key, keystr, sizeof(keystr));
205 fprintf(stderr, "%s: %s\n", program, keystr);
206 }
207
208 result = dst_key_todns(key, &keyb);
209 if (result != ISC_R_SUCCESS) {
210 fatal("can't decode key");
211 }
212
213 isc_buffer_usedregion(&keyb, &r);
214 dns_rdata_fromregion(rdata, dst_key_class(key), dns_rdatatype_dnskey,
215 &r);
216
217 rdclass = dst_key_class(key);
218
219 name = dns_fixedname_initname(&fixed);
220 dns_name_copy(dst_key_name(key), name);
221
222 dst_key_free(&key);
223 }
224
225 static void
226 logkey(dns_rdata_t *rdata) {
227 isc_result_t result;
228 dst_key_t *key = NULL;
229 isc_buffer_t buf;
230 char keystr[DST_KEY_FORMATSIZE];
231
232 isc_buffer_init(&buf, rdata->data, rdata->length);
233 isc_buffer_add(&buf, rdata->length);
234 result = dst_key_fromdns(name, rdclass, &buf, mctx, &key);
235 if (result != ISC_R_SUCCESS) {
236 return;
237 }
238
239 dst_key_format(key, keystr, sizeof(keystr));
240 fprintf(stderr, "%s: %s\n", program, keystr);
241
242 dst_key_free(&key);
243 }
244
245 static void
246 emit(dns_dsdigest_t dt, bool showall, bool cds, dns_rdata_t *rdata) {
247 isc_result_t result;
248 unsigned char buf[DNS_DS_BUFFERSIZE];
249 char text_buf[DST_KEY_MAXTEXTSIZE];
250 char name_buf[DNS_NAME_MAXWIRE];
251 char class_buf[10];
252 isc_buffer_t textb, nameb, classb;
253 isc_region_t r;
254 dns_rdata_t ds;
255 dns_rdata_dnskey_t dnskey;
256
257 isc_buffer_init(&textb, text_buf, sizeof(text_buf));
258 isc_buffer_init(&nameb, name_buf, sizeof(name_buf));
259 isc_buffer_init(&classb, class_buf, sizeof(class_buf));
260
261 dns_rdata_init(&ds);
262
263 result = dns_rdata_tostruct(rdata, &dnskey, NULL);
264 if (result != ISC_R_SUCCESS) {
265 fatal("can't convert DNSKEY");
266 }
267
268 if ((dnskey.flags & DNS_KEYFLAG_REVOKE) != 0) {
269 return;
270 }
271
272 if ((dnskey.flags & DNS_KEYFLAG_KSK) == 0 && !showall) {
273 return;
274 }
275
276 result = dns_ds_buildrdata(name, rdata, dt, buf, &ds);
277 if (result != ISC_R_SUCCESS) {
278 fatal("can't build record");
279 }
280
281 result = dns_name_totext(name, 0, &nameb);
282 if (result != ISC_R_SUCCESS) {
283 fatal("can't print name");
284 }
285
286 result = dns_rdata_tofmttext(&ds, (dns_name_t *)NULL, 0, 0, split_width,
287 "", &textb);
288
289 if (result != ISC_R_SUCCESS) {
290 fatal("can't print rdata");
291 }
292
293 result = dns_rdataclass_totext(rdclass, &classb);
294 if (result != ISC_R_SUCCESS) {
295 fatal("can't print class");
296 }
297
298 isc_buffer_usedregion(&nameb, &r);
299 printf("%.*s ", (int)r.length, r.base);
300
301 if (emitttl) {
302 printf("%u ", ttl);
303 }
304
305 isc_buffer_usedregion(&classb, &r);
306 printf("%.*s", (int)r.length, r.base);
307
308 if (cds) {
309 printf(" CDS ");
310 } else {
311 printf(" DS ");
312 }
313
314 isc_buffer_usedregion(&textb, &r);
315 printf("%.*s\n", (int)r.length, r.base);
316 }
317
318 static void
319 emits(bool showall, bool cds, dns_rdata_t *rdata) {
320 unsigned int i, n;
321
322 n = sizeof(dtype) / sizeof(dtype[0]);
323 for (i = 0; i < n; i++) {
324 if (dtype[i] == DNS_DSDIGEST_SHA1) {
325 fprintf(stderr,
326 "WARNING: DS digest type %u is deprecated\n",
327 i);
328 }
329 if (dtype[i] != 0) {
330 emit(dtype[i], showall, cds, rdata);
331 }
332 }
333 }
334
335 noreturn static void
336 usage(int ret);
337
338 static void
339 usage(int ret) {
340 fprintf(stderr, "Usage:\n");
341 fprintf(stderr, " %s [options] keyfile\n\n", program);
342 fprintf(stderr, " %s [options] -f zonefile [zonename]\n\n", program);
343 fprintf(stderr, " %s [options] -s dnsname\n\n", program);
344 fprintf(stderr, " %s [-h|-V]\n\n", program);
345 fprintf(stderr, "Version: %s\n", PACKAGE_VERSION);
346 fprintf(stderr, "Options:\n"
347 " -1: digest algorithm SHA-1 (deprecated)\n"
348 " -2: digest algorithm SHA-256\n"
349 " -a algorithm: digest algorithm (SHA-1 "
350 "(deprecated), SHA-256 or SHA-384)\n"
351 " -A: include all keys in DS set, not just KSKs (-f "
352 "only)\n"
353 " -c class: rdata class for DS set (default IN) (-f "
354 "or -s only)\n"
355 " -C: print CDS records\n"
356 " -f zonefile: read keys from a zone file\n"
357 " -h: print help information\n"
358 " -K directory: where to find key or keyset files\n"
359 " -w split base64 rdata text into chunks\n"
360 " -s: read keys from keyset-<dnsname> file\n"
361 " -T: TTL of output records (omitted by default)\n"
362 " -v level: verbosity\n"
363 " -V: print version information\n");
364 fprintf(stderr, "Output: DS or CDS RRs\n");
365
366 exit(ret);
367 }
368
369 int
370 main(int argc, char **argv) {
371 char *classname = NULL;
372 char *filename = NULL, *dir = NULL, *namestr;
373 char *endp, *arg1;
374 int ch;
375 bool cds = false;
376 bool usekeyset = false;
377 bool showall = false;
378 isc_result_t result;
379 isc_log_t *log = NULL;
380 dns_rdataset_t rdataset;
381 dns_rdata_t rdata;
382
383 dns_rdata_init(&rdata);
384
385 if (argc == 1) {
386 usage(EXIT_FAILURE);
387 }
388
389 isc_mem_create(&mctx);
390
391 isc_commandline_errprint = false;
392
393 #define OPTIONS "12Aa:Cc:d:Ff:K:l:sT:v:whV"
394 while ((ch = isc_commandline_parse(argc, argv, OPTIONS)) != -1) {
395 switch (ch) {
396 case '1':
397 add_dtype(DNS_DSDIGEST_SHA1);
398 break;
399 case '2':
400 add_dtype(DNS_DSDIGEST_SHA256);
401 break;
402 case 'A':
403 showall = true;
404 break;
405 case 'a':
406 add_dtype(strtodsdigest(isc_commandline_argument));
407 break;
408 case 'C':
409 cds = true;
410 break;
411 case 'c':
412 classname = isc_commandline_argument;
413 break;
414 case 'd':
415 fprintf(stderr,
416 "%s: the -d option is deprecated; "
417 "use -K\n",
418 program);
419 /* fall through */
420 case 'K':
421 dir = isc_commandline_argument;
422 if (strlen(dir) == 0U) {
423 fatal("directory must be non-empty string");
424 }
425 break;
426 case 'f':
427 filename = isc_commandline_argument;
428 break;
429 case 'l':
430 fatal("-l option (DLV lookaside) is obsolete");
431 break;
432 case 's':
433 usekeyset = true;
434 break;
435 case 'T':
436 emitttl = true;
437 ttl = strtottl(isc_commandline_argument);
438 break;
439 case 'v':
440 verbose = strtol(isc_commandline_argument, &endp, 0);
441 if (*endp != '\0') {
442 fatal("-v must be followed by a number");
443 }
444 break;
445 case 'w':
446 split_width = UINT_MAX;
447 break;
448 case 'F':
449 /* Reserved for FIPS mode */
450 FALLTHROUGH;
451 case '?':
452 if (isc_commandline_option != '?') {
453 fprintf(stderr, "%s: invalid argument -%c\n",
454 program, isc_commandline_option);
455 }
456 /* Does not return. */
457 usage(EXIT_FAILURE);
458
459 case 'h':
460 /* Does not return. */
461 usage(EXIT_SUCCESS);
462
463 case 'V':
464 /* Does not return. */
465 version(program);
466
467 default:
468 fprintf(stderr, "%s: unhandled option -%c\n", program,
469 isc_commandline_option);
470 exit(EXIT_FAILURE);
471 }
472 }
473
474 rdclass = strtoclass(classname);
475
476 if (usekeyset && filename != NULL) {
477 fatal("cannot use both -s and -f");
478 }
479
480 /* When not using -f, -A is implicit */
481 if (filename == NULL) {
482 showall = true;
483 }
484
485 /* Default digest type if none specified. */
486 if (dtype[0] == 0) {
487 dtype[0] = DNS_DSDIGEST_SHA256;
488 }
489
490 /*
491 * Use local variable arg1 so that clang can correctly analyse
492 * reachable paths rather than 'argc < isc_commandline_index + 1'.
493 */
494 arg1 = argv[isc_commandline_index];
495 if (arg1 == NULL && filename == NULL) {
496 fatal("the key file name was not specified");
497 }
498 if (arg1 != NULL && argv[isc_commandline_index + 1] != NULL) {
499 fatal("extraneous arguments");
500 }
501
502 result = dst_lib_init(mctx, NULL);
503 if (result != ISC_R_SUCCESS) {
504 fatal("could not initialize dst: %s",
505 isc_result_totext(result));
506 }
507
508 setup_logging(mctx, &log);
509
510 dns_rdataset_init(&rdataset);
511
512 if (usekeyset || filename != NULL) {
513 if (arg1 == NULL) {
514 /* using file name as the zone name */
515 namestr = filename;
516 } else {
517 namestr = arg1;
518 }
519
520 result = initname(namestr);
521 if (result != ISC_R_SUCCESS) {
522 fatal("could not initialize name %s", namestr);
523 }
524
525 if (usekeyset) {
526 result = loadkeyset(dir, &rdataset);
527 } else {
528 INSIST(filename != NULL);
529 result = loadset(filename, &rdataset);
530 }
531
532 if (result != ISC_R_SUCCESS) {
533 fatal("could not load DNSKEY set: %s\n",
534 isc_result_totext(result));
535 }
536
537 for (result = dns_rdataset_first(&rdataset);
538 result == ISC_R_SUCCESS;
539 result = dns_rdataset_next(&rdataset))
540 {
541 dns_rdata_init(&rdata);
542 dns_rdataset_current(&rdataset, &rdata);
543
544 if (verbose > 2) {
545 logkey(&rdata);
546 }
547
548 emits(showall, cds, &rdata);
549 }
550 } else {
551 unsigned char key_buf[DST_KEY_MAXSIZE];
552
553 loadkey(arg1, key_buf, DST_KEY_MAXSIZE, &rdata);
554
555 emits(showall, cds, &rdata);
556 }
557
558 if (dns_rdataset_isassociated(&rdataset)) {
559 dns_rdataset_disassociate(&rdataset);
560 }
561 cleanup_logging(&log);
562 dst_lib_destroy();
563 if (verbose > 10) {
564 isc_mem_stats(mctx, stdout);
565 }
566 isc_mem_destroy(&mctx);
567
568 rcu_barrier();
569
570 fflush(stdout);
571 if (ferror(stdout)) {
572 fprintf(stderr, "write error\n");
573 return 1;
574 } else {
575 return 0;
576 }
577 }
578