dnssec-dsfromkey.c revision 1.8 1 /* $NetBSD: dnssec-dsfromkey.c,v 1.8 2020/05/24 19:46:11 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * This Source Code Form is subject to the terms of the Mozilla Public
7 * License, v. 2.0. If a copy of the MPL was not distributed with this
8 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 *
10 * See the COPYRIGHT file distributed with this work for additional
11 * information regarding copyright ownership.
12 */
13
14 /*! \file */
15
16 #include <inttypes.h>
17 #include <stdbool.h>
18 #include <stdlib.h>
19
20 #include <isc/buffer.h>
21 #include <isc/commandline.h>
22 #include <isc/hash.h>
23 #include <isc/mem.h>
24 #include <isc/print.h>
25 #include <isc/string.h>
26 #include <isc/util.h>
27
28 #include <dns/callbacks.h>
29 #include <dns/db.h>
30 #include <dns/dbiterator.h>
31 #include <dns/ds.h>
32 #include <dns/fixedname.h>
33 #include <dns/keyvalues.h>
34 #include <dns/log.h>
35 #include <dns/master.h>
36 #include <dns/name.h>
37 #include <dns/rdata.h>
38 #include <dns/rdataclass.h>
39 #include <dns/rdataset.h>
40 #include <dns/rdatasetiter.h>
41 #include <dns/rdatatype.h>
42 #include <dns/result.h>
43
44 #include <dst/dst.h>
45
46 #if USE_PKCS11
47 #include <pk11/result.h>
48 #endif /* if USE_PKCS11 */
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
61 static isc_result_t
62 initname(char *setname) {
63 isc_result_t result;
64 isc_buffer_t buf;
65
66 name = dns_fixedname_initname(&fixed);
67
68 isc_buffer_init(&buf, setname, strlen(setname));
69 isc_buffer_add(&buf, strlen(setname));
70 result = dns_name_fromtext(name, &buf, dns_rootname, 0, NULL);
71 return (result);
72 }
73
74 static void
75 db_load_from_stream(dns_db_t *db, FILE *fp) {
76 isc_result_t result;
77 dns_rdatacallbacks_t callbacks;
78
79 dns_rdatacallbacks_init(&callbacks);
80 result = dns_db_beginload(db, &callbacks);
81 if (result != ISC_R_SUCCESS) {
82 fatal("dns_db_beginload failed: %s", isc_result_totext(result));
83 }
84
85 result = dns_master_loadstream(fp, name, name, rdclass, 0, &callbacks,
86 mctx);
87 if (result != ISC_R_SUCCESS) {
88 fatal("can't load from input: %s", isc_result_totext(result));
89 }
90
91 result = dns_db_endload(db, &callbacks);
92 if (result != ISC_R_SUCCESS) {
93 fatal("dns_db_endload failed: %s", isc_result_totext(result));
94 }
95 }
96
97 static isc_result_t
98 loadset(const char *filename, dns_rdataset_t *rdataset) {
99 isc_result_t result;
100 dns_db_t *db = NULL;
101 dns_dbnode_t *node = NULL;
102 char setname[DNS_NAME_FORMATSIZE];
103
104 dns_name_format(name, setname, sizeof(setname));
105
106 result = dns_db_create(mctx, "rbt", name, dns_dbtype_zone, rdclass, 0,
107 NULL, &db);
108 if (result != ISC_R_SUCCESS) {
109 fatal("can't create database");
110 }
111
112 if (strcmp(filename, "-") == 0) {
113 db_load_from_stream(db, stdin);
114 filename = "input";
115 } else {
116 result = dns_db_load(db, filename, dns_masterformat_text, 0);
117 if (result != ISC_R_SUCCESS && result != DNS_R_SEENINCLUDE) {
118 fatal("can't load %s: %s", filename,
119 isc_result_totext(result));
120 }
121 }
122
123 result = dns_db_findnode(db, name, false, &node);
124 if (result != ISC_R_SUCCESS) {
125 fatal("can't find %s node in %s", setname, filename);
126 }
127
128 result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_dnskey, 0, 0,
129 rdataset, NULL);
130
131 if (result == ISC_R_NOTFOUND) {
132 fatal("no DNSKEY RR for %s in %s", setname, filename);
133 } else if (result != ISC_R_SUCCESS) {
134 fatal("dns_db_findrdataset");
135 }
136
137 if (node != NULL) {
138 dns_db_detachnode(db, &node);
139 }
140 if (db != NULL) {
141 dns_db_detach(&db);
142 }
143 return (result);
144 }
145
146 static isc_result_t
147 loadkeyset(char *dirname, dns_rdataset_t *rdataset) {
148 isc_result_t result;
149 char filename[PATH_MAX + 1];
150 isc_buffer_t buf;
151
152 dns_rdataset_init(rdataset);
153
154 isc_buffer_init(&buf, filename, sizeof(filename));
155 if (dirname != NULL) {
156 /* allow room for a trailing slash */
157 if (strlen(dirname) >= isc_buffer_availablelength(&buf)) {
158 return (ISC_R_NOSPACE);
159 }
160 isc_buffer_putstr(&buf, dirname);
161 if (dirname[strlen(dirname) - 1] != '/') {
162 isc_buffer_putstr(&buf, "/");
163 }
164 }
165
166 if (isc_buffer_availablelength(&buf) < 7) {
167 return (ISC_R_NOSPACE);
168 }
169 isc_buffer_putstr(&buf, "keyset-");
170
171 result = dns_name_tofilenametext(name, false, &buf);
172 check_result(result, "dns_name_tofilenametext()");
173 if (isc_buffer_availablelength(&buf) == 0) {
174 return (ISC_R_NOSPACE);
175 }
176 isc_buffer_putuint8(&buf, 0);
177
178 return (loadset(filename, rdataset));
179 }
180
181 static void
182 loadkey(char *filename, unsigned char *key_buf, unsigned int key_buf_size,
183 dns_rdata_t *rdata) {
184 isc_result_t result;
185 dst_key_t *key = NULL;
186 isc_buffer_t keyb;
187 isc_region_t r;
188
189 dns_rdata_init(rdata);
190
191 isc_buffer_init(&keyb, key_buf, key_buf_size);
192
193 result = dst_key_fromnamedfile(filename, NULL, DST_TYPE_PUBLIC, mctx,
194 &key);
195 if (result != ISC_R_SUCCESS) {
196 fatal("can't load %s.key: %s", filename,
197 isc_result_totext(result));
198 }
199
200 if (verbose > 2) {
201 char keystr[DST_KEY_FORMATSIZE];
202
203 dst_key_format(key, keystr, sizeof(keystr));
204 fprintf(stderr, "%s: %s\n", program, keystr);
205 }
206
207 result = dst_key_todns(key, &keyb);
208 if (result != ISC_R_SUCCESS) {
209 fatal("can't decode key");
210 }
211
212 isc_buffer_usedregion(&keyb, &r);
213 dns_rdata_fromregion(rdata, dst_key_class(key), dns_rdatatype_dnskey,
214 &r);
215
216 rdclass = dst_key_class(key);
217
218 name = dns_fixedname_initname(&fixed);
219 dns_name_copynf(dst_key_name(key), name);
220
221 dst_key_free(&key);
222 }
223
224 static void
225 logkey(dns_rdata_t *rdata) {
226 isc_result_t result;
227 dst_key_t *key = NULL;
228 isc_buffer_t buf;
229 char keystr[DST_KEY_FORMATSIZE];
230
231 isc_buffer_init(&buf, rdata->data, rdata->length);
232 isc_buffer_add(&buf, rdata->length);
233 result = dst_key_fromdns(name, rdclass, &buf, mctx, &key);
234 if (result != ISC_R_SUCCESS) {
235 return;
236 }
237
238 dst_key_format(key, keystr, sizeof(keystr));
239 fprintf(stderr, "%s: %s\n", program, keystr);
240
241 dst_key_free(&key);
242 }
243
244 static void
245 emit(dns_dsdigest_t dt, bool showall, bool cds, dns_rdata_t *rdata) {
246 isc_result_t result;
247 unsigned char buf[DNS_DS_BUFFERSIZE];
248 char text_buf[DST_KEY_MAXTEXTSIZE];
249 char name_buf[DNS_NAME_MAXWIRE];
250 char class_buf[10];
251 isc_buffer_t textb, nameb, classb;
252 isc_region_t r;
253 dns_rdata_t ds;
254 dns_rdata_dnskey_t dnskey;
255
256 isc_buffer_init(&textb, text_buf, sizeof(text_buf));
257 isc_buffer_init(&nameb, name_buf, sizeof(name_buf));
258 isc_buffer_init(&classb, class_buf, sizeof(class_buf));
259
260 dns_rdata_init(&ds);
261
262 result = dns_rdata_tostruct(rdata, &dnskey, NULL);
263 if (result != ISC_R_SUCCESS) {
264 fatal("can't convert DNSKEY");
265 }
266
267 if ((dnskey.flags & DNS_KEYFLAG_KSK) == 0 && !showall) {
268 return;
269 }
270
271 result = dns_ds_buildrdata(name, rdata, dt, buf, &ds);
272 if (result != ISC_R_SUCCESS) {
273 fatal("can't build record");
274 }
275
276 result = dns_name_totext(name, false, &nameb);
277 if (result != ISC_R_SUCCESS) {
278 fatal("can't print name");
279 }
280
281 result = dns_rdata_tofmttext(&ds, (dns_name_t *)NULL, 0, 0, 0, "",
282 &textb);
283
284 if (result != ISC_R_SUCCESS) {
285 fatal("can't print rdata");
286 }
287
288 result = dns_rdataclass_totext(rdclass, &classb);
289 if (result != ISC_R_SUCCESS) {
290 fatal("can't print class");
291 }
292
293 isc_buffer_usedregion(&nameb, &r);
294 printf("%.*s ", (int)r.length, r.base);
295
296 if (emitttl) {
297 printf("%u ", ttl);
298 }
299
300 isc_buffer_usedregion(&classb, &r);
301 printf("%.*s", (int)r.length, r.base);
302
303 if (cds) {
304 printf(" CDS ");
305 } else {
306 printf(" DS ");
307 }
308
309 isc_buffer_usedregion(&textb, &r);
310 printf("%.*s\n", (int)r.length, r.base);
311 }
312
313 static void
314 emits(bool showall, bool cds, dns_rdata_t *rdata) {
315 unsigned i, n;
316
317 n = sizeof(dtype) / sizeof(dtype[0]);
318 for (i = 0; i < n; i++) {
319 if (dtype[i] != 0) {
320 emit(dtype[i], showall, cds, rdata);
321 }
322 }
323 }
324
325 ISC_PLATFORM_NORETURN_PRE static void
326 usage(void) ISC_PLATFORM_NORETURN_POST;
327
328 static void
329 usage(void) {
330 fprintf(stderr, "Usage:\n");
331 fprintf(stderr, " %s [options] keyfile\n\n", program);
332 fprintf(stderr, " %s [options] -f zonefile [zonename]\n\n", program);
333 fprintf(stderr, " %s [options] -s dnsname\n\n", program);
334 fprintf(stderr, " %s [-h|-V]\n\n", program);
335 fprintf(stderr, "Version: %s\n", VERSION);
336 fprintf(stderr, "Options:\n"
337 " -1: digest algorithm SHA-1\n"
338 " -2: digest algorithm SHA-256\n"
339 " -a algorithm: digest algorithm (SHA-1, SHA-256 or "
340 "SHA-384)\n"
341 " -A: include all keys in DS set, not just KSKs (-f "
342 "only)\n"
343 " -c class: rdata class for DS set (default IN) (-f "
344 "or -s only)\n"
345 " -C: print CDS records\n"
346 " -f zonefile: read keys from a zone file\n"
347 " -h: print help information\n"
348 " -K directory: where to find key or keyset files\n"
349 " -s: read keys from keyset-<dnsname> file\n"
350 " -T: TTL of output records (omitted by default)\n"
351 " -v level: verbosity\n"
352 " -V: print version information\n");
353 fprintf(stderr, "Output: DS or CDS RRs\n");
354
355 exit(-1);
356 }
357
358 int
359 main(int argc, char **argv) {
360 char *classname = NULL;
361 char *filename = NULL, *dir = NULL, *namestr;
362 char *endp, *arg1;
363 int ch;
364 bool cds = false;
365 bool usekeyset = false;
366 bool showall = false;
367 isc_result_t result;
368 isc_log_t *log = NULL;
369 dns_rdataset_t rdataset;
370 dns_rdata_t rdata;
371
372 dns_rdata_init(&rdata);
373
374 if (argc == 1) {
375 usage();
376 }
377
378 isc_mem_create(&mctx);
379
380 #if USE_PKCS11
381 pk11_result_register();
382 #endif /* if USE_PKCS11 */
383 dns_result_register();
384
385 isc_commandline_errprint = false;
386
387 #define OPTIONS "12Aa:Cc:d:Ff:K:l:sT:v:hV"
388 while ((ch = isc_commandline_parse(argc, argv, OPTIONS)) != -1) {
389 switch (ch) {
390 case '1':
391 add_dtype(DNS_DSDIGEST_SHA1);
392 break;
393 case '2':
394 add_dtype(DNS_DSDIGEST_SHA256);
395 break;
396 case 'A':
397 showall = true;
398 break;
399 case 'a':
400 add_dtype(strtodsdigest(isc_commandline_argument));
401 break;
402 case 'C':
403 cds = true;
404 break;
405 case 'c':
406 classname = isc_commandline_argument;
407 break;
408 case 'd':
409 fprintf(stderr,
410 "%s: the -d option is deprecated; "
411 "use -K\n",
412 program);
413 /* fall through */
414 case 'K':
415 dir = isc_commandline_argument;
416 if (strlen(dir) == 0U) {
417 fatal("directory must be non-empty string");
418 }
419 break;
420 case 'f':
421 filename = isc_commandline_argument;
422 break;
423 case 'l':
424 fatal("-l option (DLV lookaside) is obsolete");
425 break;
426 case 's':
427 usekeyset = true;
428 break;
429 case 'T':
430 emitttl = true;
431 ttl = strtottl(isc_commandline_argument);
432 break;
433 case 'v':
434 verbose = strtol(isc_commandline_argument, &endp, 0);
435 if (*endp != '\0') {
436 fatal("-v must be followed by a number");
437 }
438 break;
439 case 'F':
440 /* Reserved for FIPS mode */
441 /* FALLTHROUGH */
442 case '?':
443 if (isc_commandline_option != '?') {
444 fprintf(stderr, "%s: invalid argument -%c\n",
445 program, isc_commandline_option);
446 }
447 /* FALLTHROUGH */
448 case 'h':
449 /* Does not return. */
450 usage();
451
452 case 'V':
453 /* Does not return. */
454 version(program);
455
456 default:
457 fprintf(stderr, "%s: unhandled option -%c\n", program,
458 isc_commandline_option);
459 exit(1);
460 }
461 }
462
463 rdclass = strtoclass(classname);
464
465 if (usekeyset && filename != NULL) {
466 fatal("cannot use both -s and -f");
467 }
468
469 /* When not using -f, -A is implicit */
470 if (filename == NULL) {
471 showall = true;
472 }
473
474 /* Default digest type if none specified. */
475 if (dtype[0] == 0) {
476 dtype[0] = DNS_DSDIGEST_SHA256;
477 }
478
479 /*
480 * Use local variable arg1 so that clang can correctly analyse
481 * reachable paths rather than 'argc < isc_commandline_index + 1'.
482 */
483 arg1 = argv[isc_commandline_index];
484 if (arg1 == NULL && filename == NULL) {
485 fatal("the key file name was not specified");
486 }
487 if (arg1 != NULL && argv[isc_commandline_index + 1] != NULL) {
488 fatal("extraneous arguments");
489 }
490
491 result = dst_lib_init(mctx, NULL);
492 if (result != ISC_R_SUCCESS) {
493 fatal("could not initialize dst: %s",
494 isc_result_totext(result));
495 }
496
497 setup_logging(mctx, &log);
498
499 dns_rdataset_init(&rdataset);
500
501 if (usekeyset || filename != NULL) {
502 if (arg1 == NULL) {
503 /* using file name as the zone name */
504 namestr = filename;
505 } else {
506 namestr = arg1;
507 }
508
509 result = initname(namestr);
510 if (result != ISC_R_SUCCESS) {
511 fatal("could not initialize name %s", namestr);
512 }
513
514 if (usekeyset) {
515 result = loadkeyset(dir, &rdataset);
516 } else {
517 INSIST(filename != NULL);
518 result = loadset(filename, &rdataset);
519 }
520
521 if (result != ISC_R_SUCCESS) {
522 fatal("could not load DNSKEY set: %s\n",
523 isc_result_totext(result));
524 }
525
526 for (result = dns_rdataset_first(&rdataset);
527 result == ISC_R_SUCCESS;
528 result = dns_rdataset_next(&rdataset))
529 {
530 dns_rdata_init(&rdata);
531 dns_rdataset_current(&rdataset, &rdata);
532
533 if (verbose > 2) {
534 logkey(&rdata);
535 }
536
537 emits(showall, cds, &rdata);
538 }
539 } else {
540 unsigned char key_buf[DST_KEY_MAXSIZE];
541
542 loadkey(arg1, key_buf, DST_KEY_MAXSIZE, &rdata);
543
544 emits(showall, cds, &rdata);
545 }
546
547 if (dns_rdataset_isassociated(&rdataset)) {
548 dns_rdataset_disassociate(&rdataset);
549 }
550 cleanup_logging(&log);
551 dst_lib_destroy();
552 if (verbose > 10) {
553 isc_mem_stats(mctx, stdout);
554 }
555 isc_mem_destroy(&mctx);
556
557 fflush(stdout);
558 if (ferror(stdout)) {
559 fprintf(stderr, "write error\n");
560 return (1);
561 } else {
562 return (0);
563 }
564 }
565