contrib/bind-9.3/bin/dnssec/dnssec-keygen.c

   1 /*
   2  * Portions Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Portions Copyright (C) 2000-2003  Internet Software Consortium.
   4  * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
  11  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
  13  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  16  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 /* $Id: dnssec-keygen.c,v 1.48.2.1.10.11 2004/06/11 01:17:34 marka Exp $ */
  20
  21 #include <config.h>
  22
  23 #include <stdlib.h>
  24
  25 #include <isc/buffer.h>
  26 #include <isc/commandline.h>
  27 #include <isc/entropy.h>
  28 #include <isc/mem.h>
  29 #include <isc/region.h>
  30 #include <isc/string.h>
  31 #include <isc/util.h>
  32
  33 #include <dns/fixedname.h>
  34 #include <dns/keyvalues.h>
  35 #include <dns/log.h>
  36 #include <dns/name.h>
  37 #include <dns/rdataclass.h>
  38 #include <dns/result.h>
  39 #include <dns/secalg.h>
  40
  41 #include <dst/dst.h>
  42
  43 #include "dnssectool.h"
  44
  45 #define MAX_RSA 4096 /* should be long enough... */
  46
  47 const char *program = "dnssec-keygen";
  48 int verbose;
  49
  50 static const char *algs = "RSA | RSAMD5 | DH | DSA | RSASHA1 | HMAC-MD5";
  51
  52 static isc_boolean_t
  53 dsa_size_ok(int size) {
  54         return (ISC_TF(size >= 512 && size <= 1024 && size % 64 == 0));
  55 }
  56
  57 static void
  58 usage(void) {
  59         fprintf(stderr, "Usage:\n");
  60         fprintf(stderr, "    %s -a alg -b bits -n type [options] name\n\n",
  61                 program);
  62         fprintf(stderr, "Version: %s\n", VERSION);
  63         fprintf(stderr, "Required options:\n");
  64         fprintf(stderr, "    -a algorithm: %s\n", algs);
  65         fprintf(stderr, "    -b key size, in bits:\n");
  66         fprintf(stderr, "        RSAMD5:\t\t[512..%d]\n", MAX_RSA);
  67         fprintf(stderr, "        RSASHA1:\t\t[512..%d]\n", MAX_RSA);
  68         fprintf(stderr, "        DH:\t\t[128..4096]\n");
  69         fprintf(stderr, "        DSA:\t\t[512..1024] and divisible by 64\n");
  70         fprintf(stderr, "        HMAC-MD5:\t[1..512]\n");
  71         fprintf(stderr, "    -n nametype: ZONE | HOST | ENTITY | USER | OTHER\n");
  72         fprintf(stderr, "    name: owner of the key\n");
  73         fprintf(stderr, "Other options:\n");
  74         fprintf(stderr, "    -c <class> (default: IN)\n");
  75         fprintf(stderr, "    -e use large exponent (RSAMD5/RSASHA1 only)\n");
  76         fprintf(stderr, "    -f keyflag: KSK\n");
  77         fprintf(stderr, "    -g <generator> use specified generator "
  78                 "(DH only)\n");
  79         fprintf(stderr, "    -t <type>: "
  80                 "AUTHCONF | NOAUTHCONF | NOAUTH | NOCONF "
  81                 "(default: AUTHCONF)\n");
  82         fprintf(stderr, "    -p <protocol>: "
  83                "default: 3 [dnssec]\n");
  84         fprintf(stderr, "    -s <strength> strength value this key signs DNS "
  85                 "records with (default: 0)\n");
  86         fprintf(stderr, "    -r <randomdev>: a file containing random data\n");
  87         fprintf(stderr, "    -v <verbose level>\n");
  88         fprintf(stderr, "    -k : generate a TYPE=KEY key\n");
  89         fprintf(stderr, "Output:\n");
  90         fprintf(stderr, "     K<name>+<alg>+<id>.key, "
  91                 "K<name>+<alg>+<id>.private\n");
  92
  93         exit (-1);
  94 }
  95
  96 int
  97 main(int argc, char **argv) {
  98         char            *algname = NULL, *nametype = NULL, *type = NULL;
  99         char            *classname = NULL;
 100         char            *endp;
 101         dst_key_t       *key = NULL, *oldkey;
 102         dns_fixedname_t fname;
 103         dns_name_t      *name;
 104         isc_uint16_t    flags = 0, ksk = 0;
 105         dns_secalg_t    alg;
 106         isc_boolean_t   conflict = ISC_FALSE, null_key = ISC_FALSE;
 107         isc_mem_t       *mctx = NULL;
 108         int             ch, rsa_exp = 0, generator = 0, param = 0;
 109         int             protocol = -1, size = -1, signatory = 0;
 110         isc_result_t    ret;
 111         isc_textregion_t r;
 112         char            filename[255];
 113         isc_buffer_t    buf;
 114         isc_log_t       *log = NULL;
 115         isc_entropy_t   *ectx = NULL;
 116         dns_rdataclass_t rdclass;
 117         int             options = DST_TYPE_PRIVATE | DST_TYPE_PUBLIC;
 118
 119         if (argc == 1)
 120                 usage();
 121
 122         RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
 123
 124         dns_result_register();
 125
 126         while ((ch = isc_commandline_parse(argc, argv,
 127                                            "a:b:c:ef:g:kn:t:p:s:r:v:h")) != -1)
 128         {
 129             switch (ch) {
 130                 case 'a':
 131                         algname = isc_commandline_argument;
 132                         break;
 133                 case 'b':
 134                         size = strtol(isc_commandline_argument, &endp, 10);
 135                         if (*endp != '\0' || size < 0)
 136                                 fatal("-b requires a non-negative number");
 137                         break;
 138                 case 'c':
 139                         classname = isc_commandline_argument;
 140                         break;
 141                 case 'e':
 142                         rsa_exp = 1;
 143                         break;
 144                 case 'f':
 145                         if (strcasecmp(isc_commandline_argument, "KSK") == 0)
 146                                 ksk = DNS_KEYFLAG_KSK;
 147                         else
 148                                 fatal("unknown flag '%s'",
 149                                       isc_commandline_argument);
 150                         break;
 151                 case 'g':
 152                         generator = strtol(isc_commandline_argument,
 153                                            &endp, 10);
 154                         if (*endp != '\0' || generator <= 0)
 155                                 fatal("-g requires a positive number");
 156                         break;
 157                 case 'k':
 158                         options |= DST_TYPE_KEY;
 159                         break;
 160                 case 'n':
 161                         nametype = isc_commandline_argument;
 162                         break;
 163                 case 't':
 164                         type = isc_commandline_argument;
 165                         break;
 166                 case 'p':
 167                         protocol = strtol(isc_commandline_argument, &endp, 10);
 168                         if (*endp != '\0' || protocol < 0 || protocol > 255)
 169                                 fatal("-p must be followed by a number "
 170                                       "[0..255]");
 171                         break;
 172                 case 's':
 173                         signatory = strtol(isc_commandline_argument,
 174                                            &endp, 10);
 175                         if (*endp != '\0' || signatory < 0 || signatory > 15)
 176                                 fatal("-s must be followed by a number "
 177                                       "[0..15]");
 178                         break;
 179                 case 'r':
 180                         setup_entropy(mctx, isc_commandline_argument, &ectx);
 181                         break;
 182                 case 'v':
 183                         endp = NULL;
 184                         verbose = strtol(isc_commandline_argument, &endp, 0);
 185                         if (*endp != '\0')
 186                                 fatal("-v must be followed by a number");
 187                         break;
 188
 189                 case 'h':
 190                         usage();
 191                 default:
 192                         fprintf(stderr, "%s: invalid argument -%c\n",
 193                                 program, ch);
 194                         usage();
 195                 }
 196         }
 197
 198         if (ectx == NULL)
 199                 setup_entropy(mctx, NULL, &ectx);
 200         ret = dst_lib_init(mctx, ectx,
 201                            ISC_ENTROPY_BLOCKING | ISC_ENTROPY_GOODONLY);
 202         if (ret != ISC_R_SUCCESS)
 203                 fatal("could not initialize dst");
 204
 205         setup_logging(verbose, mctx, &log);
 206
 207         if (argc < isc_commandline_index + 1)
 208                 fatal("the key name was not specified");
 209         if (argc > isc_commandline_index + 1)
 210                 fatal("extraneous arguments");
 211
 212         if (algname == NULL)
 213                 fatal("no algorithm was specified");
 214         if (strcasecmp(algname, "HMAC-MD5") == 0) {
 215                 options |= DST_TYPE_KEY;
 216                 alg = DST_ALG_HMACMD5;
 217         } else {
 218                 r.base = algname;
 219                 r.length = strlen(algname);
 220                 ret = dns_secalg_fromtext(&alg, &r);
 221                 if (ret != ISC_R_SUCCESS)
 222                         fatal("unknown algorithm %s", algname);
 223                 if (alg == DST_ALG_DH)
 224                         options |= DST_TYPE_KEY;
 225         }
 226
 227         if (type != NULL && (options & DST_TYPE_KEY) != 0) {
 228                 if (strcasecmp(type, "NOAUTH") == 0)
 229                         flags |= DNS_KEYTYPE_NOAUTH;
 230                 else if (strcasecmp(type, "NOCONF") == 0)
 231                         flags |= DNS_KEYTYPE_NOCONF;
 232                 else if (strcasecmp(type, "NOAUTHCONF") == 0) {
 233                         flags |= (DNS_KEYTYPE_NOAUTH | DNS_KEYTYPE_NOCONF);
 234                         if (size < 0)
 235                                 size = 0;
 236                 }
 237                 else if (strcasecmp(type, "AUTHCONF") == 0)
 238                         /* nothing */;
 239                 else
 240                         fatal("invalid type %s", type);
 241         }
 242
 243         if (size < 0)
 244                 fatal("key size not specified (-b option)");
 245
 246         switch (alg) {
 247         case DNS_KEYALG_RSAMD5:
 248         case DNS_KEYALG_RSASHA1:
 249                 if (size != 0 && (size < 512 || size > MAX_RSA))
 250                         fatal("RSA key size %d out of range", size);
 251                 break;
 252         case DNS_KEYALG_DH:
 253                 if (size != 0 && (size < 128 || size > 4096))
 254                         fatal("DH key size %d out of range", size);
 255                 break;
 256         case DNS_KEYALG_DSA:
 257                 if (size != 0 && !dsa_size_ok(size))
 258                         fatal("invalid DSS key size: %d", size);
 259                 break;
 260         case DST_ALG_HMACMD5:
 261                 if (size < 1 || size > 512)
 262                         fatal("HMAC-MD5 key size %d out of range", size);
 263                 break;
 264         }
 265
 266         if (!(alg == DNS_KEYALG_RSAMD5 || alg == DNS_KEYALG_RSASHA1) &&
 267             rsa_exp != 0)
 268                 fatal("specified RSA exponent for a non-RSA key");
 269
 270         if (alg != DNS_KEYALG_DH && generator != 0)
 271                 fatal("specified DH generator for a non-DH key");
 272
 273         if (nametype == NULL)
 274                 fatal("no nametype specified");
 275         if (strcasecmp(nametype, "zone") == 0)
 276                 flags |= DNS_KEYOWNER_ZONE;
 277         else if ((options & DST_TYPE_KEY) != 0) { /* KEY */
 278                 if (strcasecmp(nametype, "host") == 0 ||
 279                          strcasecmp(nametype, "entity") == 0)
 280                         flags |= DNS_KEYOWNER_ENTITY;
 281                 else if (strcasecmp(nametype, "user") == 0)
 282                         flags |= DNS_KEYOWNER_USER;
 283                 else
 284                         fatal("invalid KEY nametype %s", nametype);
 285         } else if (strcasecmp(nametype, "other") != 0) /* DNSKEY */
 286                 fatal("invalid DNSKEY nametype %s", nametype);
 287
 288         rdclass = strtoclass(classname);
 289
 290         if ((options & DST_TYPE_KEY) != 0)  /* KEY */
 291                 flags |= signatory;
 292         else if ((flags & DNS_KEYOWNER_ZONE) != 0) /* DNSKEY */
 293                 flags |= ksk;
 294
 295         if (protocol == -1)
 296                 protocol = DNS_KEYPROTO_DNSSEC;
 297         else if ((options & DST_TYPE_KEY) == 0 &&
 298                  protocol != DNS_KEYPROTO_DNSSEC)
 299                 fatal("invalid DNSKEY protocol: %d", protocol);
 300
 301         if ((flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY) {
 302                 if (size > 0)
 303                         fatal("specified null key with non-zero size");
 304                 if ((flags & DNS_KEYFLAG_SIGNATORYMASK) != 0)
 305                         fatal("specified null key with signing authority");
 306         }
 307
 308         if ((flags & DNS_KEYFLAG_OWNERMASK) == DNS_KEYOWNER_ZONE &&
 309             (alg == DNS_KEYALG_DH || alg == DST_ALG_HMACMD5))
 310                 fatal("a key with algorithm '%s' cannot be a zone key",
 311                       algname);
 312
 313         dns_fixedname_init(&fname);
 314         name = dns_fixedname_name(&fname);
 315         isc_buffer_init(&buf, argv[isc_commandline_index],
 316                         strlen(argv[isc_commandline_index]));
 317         isc_buffer_add(&buf, strlen(argv[isc_commandline_index]));
 318         ret = dns_name_fromtext(name, &buf, dns_rootname, ISC_FALSE, NULL);
 319         if (ret != ISC_R_SUCCESS)
 320                 fatal("invalid key name %s: %s", argv[isc_commandline_index],
 321                       isc_result_totext(ret));
 322
 323         switch(alg) {
 324         case DNS_KEYALG_RSAMD5:
 325         case DNS_KEYALG_RSASHA1:
 326                 param = rsa_exp;
 327                 break;
 328         case DNS_KEYALG_DH:
 329                 param = generator;
 330                 break;
 331         case DNS_KEYALG_DSA:
 332         case DST_ALG_HMACMD5:
 333                 param = 0;
 334                 break;
 335         }
 336
 337         if ((flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY)
 338                 null_key = ISC_TRUE;
 339
 340         isc_buffer_init(&buf, filename, sizeof(filename) - 1);
 341
 342         do {
 343                 conflict = ISC_FALSE;
 344                 oldkey = NULL;
 345
 346                 /* generate the key */
 347                 ret = dst_key_generate(name, alg, size, param, flags, protocol,
 348                                        rdclass, mctx, &key);
 349                 isc_entropy_stopcallbacksources(ectx);
 350
 351                 if (ret != ISC_R_SUCCESS) {
 352                         char namestr[DNS_NAME_FORMATSIZE];
 353                         char algstr[ALG_FORMATSIZE];
 354                         dns_name_format(name, namestr, sizeof(namestr));
 355                         alg_format(alg, algstr, sizeof(algstr));
 356                         fatal("failed to generate key %s/%s: %s\n",
 357                               namestr, algstr, isc_result_totext(ret));
 358                         exit(-1);
 359                 }
 360
 361                 /*
 362                  * Try to read a key with the same name, alg and id from disk.
 363                  * If there is one we must continue generating a new one
 364                  * unless we were asked to generate a null key, in which
 365                  * case we return failure.
 366                  */
 367                 ret = dst_key_fromfile(name, dst_key_id(key), alg,
 368                                        DST_TYPE_PRIVATE, NULL, mctx, &oldkey);
 369                 /* do not overwrite an existing key  */
 370                 if (ret == ISC_R_SUCCESS) {
 371                         dst_key_free(&oldkey);
 372                         conflict = ISC_TRUE;
 373                         if (null_key)
 374                                 break;
 375                 }
 376                 if (conflict == ISC_TRUE) {
 377                         if (verbose > 0) {
 378                                 isc_buffer_clear(&buf);
 379                                 ret = dst_key_buildfilename(key, 0, NULL, &buf);
 380                                 fprintf(stderr,
 381                                         "%s: %s already exists, "
 382                                         "generating a new key\n",
 383                                         program, filename);
 384                         }
 385                         dst_key_free(&key);
 386                 }
 387
 388         } while (conflict == ISC_TRUE);
 389
 390         if (conflict)
 391                 fatal("cannot generate a null key when a key with id 0 "
 392                       "already exists");
 393
 394         ret = dst_key_tofile(key, options, NULL);
 395         if (ret != ISC_R_SUCCESS) {
 396                 char keystr[KEY_FORMATSIZE];
 397                 key_format(key, keystr, sizeof(keystr));
 398                 fatal("failed to write key %s: %s\n", keystr,
 399                       isc_result_totext(ret));
 400         }
 401
 402         isc_buffer_clear(&buf);
 403         ret = dst_key_buildfilename(key, 0, NULL, &buf);
 404         printf("%s\n", filename);
 405         dst_key_free(&key);
 406
 407         cleanup_logging(&log);
 408         cleanup_entropy(&ectx);
 409         dst_lib_destroy();
 410         if (verbose > 10)
 411                 isc_mem_stats(mctx, stdout);
 412         isc_mem_destroy(&mctx);
 413
 414         return (0);
 415 }