crypto/heimdal-0.6.3/lib/kadm5/set_keys.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kadm5_locl.h"
  35
  36 RCSID("$Id: set_keys.c,v 1.25 2001/08/13 15:12:16 joda Exp $");
  37
  38 /*
  39  * the known and used DES enctypes
  40  */
  41
  42 static krb5_enctype des_types[] = { ETYPE_DES_CBC_CRC,
  43                                     ETYPE_DES_CBC_MD4,
  44                                     ETYPE_DES_CBC_MD5 };
  45 static unsigned n_des_types = sizeof(des_types) / sizeof(des_types[0]);
  46
  47 static krb5_error_code
  48 make_keys(krb5_context context, krb5_principal principal, const char *password,
  49           Key **keys_ret, size_t *num_keys_ret)
  50 {
  51     krb5_enctype all_etypes[] = { ETYPE_DES3_CBC_SHA1,
  52                                   ETYPE_DES_CBC_MD5,
  53                                   ETYPE_DES_CBC_MD4,
  54                                   ETYPE_DES_CBC_CRC };
  55
  56
  57     krb5_enctype e;
  58
  59     krb5_error_code ret = 0;
  60     char **ktypes, **kp;
  61
  62     Key *keys = NULL, *tmp;
  63     int num_keys = 0;
  64     Key key;
  65
  66     int i;
  67     char *v4_ktypes[] = {"des3:pw-salt", "v4", NULL};
  68
  69     ktypes = krb5_config_get_strings(context, NULL, "kadmin",
  70                                      "default_keys", NULL);
  71
  72     /* for each entry in `default_keys' try to parse it as a sequence
  73        of etype:salttype:salt, syntax of this if something like:
  74        [(des|des3|etype):](pw|afs3)[:string], if etype is omitted it
  75        means all etypes, and if string is omitted is means the default
  76        string (for that principal). Additional special values:
  77        v5 == pw-salt, and
  78        v4 == des:pw-salt:
  79        afs or afs3 == des:afs3-salt
  80     */
  81
  82     if (ktypes == NULL
  83         && krb5_config_get_bool (context, NULL, "kadmin",
  84                                  "use_v4_salt", NULL))
  85         ktypes = v4_ktypes;
  86
  87     for(kp = ktypes; kp && *kp; kp++) {
  88         krb5_enctype *etypes;
  89         int num_etypes;
  90         krb5_salt salt;
  91         krb5_boolean salt_set;
  92
  93         const char *p;
  94         char buf[3][256];
  95         int num_buf = 0;
  96
  97         p = *kp;
  98         if(strcmp(p, "v5") == 0)
  99             p = "pw-salt";
 100         else if(strcmp(p, "v4") == 0)
 101             p = "des:pw-salt:";
 102         else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
 103             p = "des:afs3-salt";
 104
 105         /* split p in a list of :-separated strings */
 106         for(num_buf = 0; num_buf < 3; num_buf++)
 107             if(strsep_copy(&p, ":", buf[num_buf], sizeof(buf[num_buf])) == -1)
 108                 break;
 109
 110         etypes = NULL;
 111         num_etypes = 0;
 112         memset(&salt, 0, sizeof(salt));
 113         salt_set = FALSE;
 114
 115         for(i = 0; i < num_buf; i++) {
 116             if(etypes == NULL) {
 117                 /* this might be a etype specifier */
 118                 /* XXX there should be a string_to_etypes handling
 119                    special cases like `des' and `all' */
 120                 if(strcmp(buf[i], "des") == 0) {
 121                     etypes = all_etypes + 1;
 122                     num_etypes = 3;
 123                     continue;
 124                 } else if(strcmp(buf[i], "des3") == 0) {
 125                     e = ETYPE_DES3_CBC_SHA1;
 126                     etypes = &e;
 127                     num_etypes = 1;
 128                     continue;
 129                 } else {
 130                     ret = krb5_string_to_enctype(context, buf[i], &e);
 131                     if(ret == 0) {
 132                         etypes = &e;
 133                         num_etypes = 1;
 134                         continue;
 135                     }
 136                 }
 137             }
 138             if(salt.salttype == 0) {
 139                 /* interpret string as a salt specifier, if no etype
 140                    is set, this sets default values */
 141                 /* XXX should perhaps use string_to_salttype, but that
 142                    interface sucks */
 143                 if(strcmp(buf[i], "pw-salt") == 0) {
 144                     if(etypes == NULL) {
 145                         etypes = all_etypes;
 146                         num_etypes = 4;
 147                     }
 148                     salt.salttype = KRB5_PW_SALT;
 149                 } else if(strcmp(buf[i], "afs3-salt") == 0) {
 150                     if(etypes == NULL) {
 151                         etypes = all_etypes + 1;
 152                         num_etypes = 3;
 153                     }
 154                     salt.salttype = KRB5_AFS3_SALT;
 155                 }
 156             } else {
 157                 /* if there is a final string, use it as the string to
 158                    salt with, this is mostly useful with null salt for
 159                    v4 compat, and a cell name for afs compat */
 160                 salt.saltvalue.data = buf[i];
 161                 salt.saltvalue.length = strlen(buf[i]);
 162                 salt_set = TRUE;
 163             }
 164         }
 165
 166         if(etypes == NULL || salt.salttype == 0) {
 167             krb5_warnx(context, "bad value for default_keys `%s'", *kp);
 168             continue;
 169         }
 170
 171         if(!salt_set) {
 172             /* make up default salt */
 173             if(salt.salttype == KRB5_PW_SALT)
 174                 ret = krb5_get_pw_salt(context, principal, &salt);
 175             else if(salt.salttype == KRB5_AFS3_SALT) {
 176                 krb5_realm *realm = krb5_princ_realm(context, principal);
 177                 salt.saltvalue.data = strdup(*realm);
 178                 if(salt.saltvalue.data == NULL) {
 179                     krb5_set_error_string(context, "out of memory while "
 180                                           "parsinig salt specifiers");
 181                     ret = ENOMEM;
 182                     goto out;
 183                 }
 184                 strlwr(salt.saltvalue.data);
 185                 salt.saltvalue.length = strlen(*realm);
 186                 salt_set = 1;
 187             }
 188         }
 189         memset(&key, 0, sizeof(key));
 190         for(i = 0; i < num_etypes; i++) {
 191             Key *k;
 192             for(k = keys; k < keys + num_keys; k++) {
 193                 if(k->key.keytype == etypes[i] &&
 194                    ((k->salt != NULL &&
 195                      k->salt->type == salt.salttype &&
 196                      k->salt->salt.length == salt.saltvalue.length &&
 197                      memcmp(k->salt->salt.data, salt.saltvalue.data,
 198                             salt.saltvalue.length) == 0) ||
 199                     (k->salt == NULL &&
 200                      salt.salttype == KRB5_PW_SALT &&
 201                      !salt_set)))
 202                     goto next_etype;
 203             }
 204
 205             ret = krb5_string_to_key_salt (context,
 206                                            etypes[i],
 207                                            password,
 208                                            salt,
 209                                            &key.key);
 210
 211             if(ret)
 212                 goto out;
 213
 214             if (salt.salttype != KRB5_PW_SALT || salt_set) {
 215                 key.salt = malloc (sizeof(*key.salt));
 216                 if (key.salt == NULL) {
 217                     free_Key(&key);
 218                     ret = ENOMEM;
 219                     goto out;
 220                 }
 221                 key.salt->type = salt.salttype;
 222                 krb5_data_zero (&key.salt->salt);
 223
 224                 /* is the salt has not been set explicitly, it will be
 225                    the default salt, so there's no need to explicitly
 226                    copy it */
 227                 if (salt_set) {
 228                     ret = krb5_data_copy(&key.salt->salt,
 229                                          salt.saltvalue.data,
 230                                          salt.saltvalue.length);
 231                     if (ret) {
 232                         free_Key(&key);
 233                         goto out;
 234                     }
 235                 }
 236             }
 237             tmp = realloc(keys, (num_keys + 1) * sizeof(*keys));
 238             if(tmp == NULL) {
 239                 free_Key(&key);
 240                 ret = ENOMEM;
 241                 goto out;
 242             }
 243             keys = tmp;
 244             keys[num_keys++] = key;
 245           next_etype:;
 246         }
 247     }
 248
 249     if(num_keys == 0) {
 250         /* if we didn't manage to find a single valid key, create a
 251            default set */
 252         /* XXX only do this is there is no `default_keys'? */
 253         krb5_salt v5_salt;
 254         tmp = realloc(keys, (num_keys + 4) * sizeof(*keys));
 255         if(tmp == NULL) {
 256             ret = ENOMEM;
 257             goto out;
 258         }
 259         keys = tmp;
 260         ret = krb5_get_pw_salt(context, principal, &v5_salt);
 261         if(ret)
 262             goto out;
 263         for(i = 0; i < 4; i++) {
 264             memset(&key, 0, sizeof(key));
 265             ret = krb5_string_to_key_salt(context, all_etypes[i], password,
 266                                           v5_salt, &key.key);
 267             if(ret) {
 268                 krb5_free_salt(context, v5_salt);
 269                 goto out;
 270             }
 271             keys[num_keys++] = key;
 272         }
 273         krb5_free_salt(context, v5_salt);
 274     }
 275
 276   out:
 277     if(ret == 0) {
 278         *keys_ret = keys;
 279         *num_keys_ret = num_keys;
 280     } else {
 281         for(i = 0; i < num_keys; i++) {
 282             free_Key(&keys[i]);
 283         }
 284         free(keys);
 285     }
 286     return ret;
 287 }
 288
 289 /*
 290  * Set the keys of `ent' to the string-to-key of `password'
 291  */
 292
 293 kadm5_ret_t
 294 _kadm5_set_keys(kadm5_server_context *context,
 295                 hdb_entry *ent,
 296                 const char *password)
 297 {
 298     kadm5_ret_t ret;
 299     Key *keys;
 300     size_t num_keys;
 301
 302     ret = make_keys(context->context, ent->principal, password,
 303                     &keys, &num_keys);
 304
 305     if(ret)
 306         return ret;
 307
 308     _kadm5_free_keys (context, ent->keys.len, ent->keys.val);
 309     ent->keys.val = keys;
 310     ent->keys.len = num_keys;
 311     ent->kvno++;
 312     return 0;
 313 }
 314
 315 /*
 316  * Set the keys of `ent' to (`n_key_data', `key_data')
 317  */
 318
 319 kadm5_ret_t
 320 _kadm5_set_keys2(kadm5_server_context *context,
 321                  hdb_entry *ent,
 322                  int16_t n_key_data,
 323                  krb5_key_data *key_data)
 324 {
 325     krb5_error_code ret;
 326     int i;
 327     unsigned len;
 328     Key *keys;
 329
 330     len  = n_key_data;
 331     keys = malloc (len * sizeof(*keys));
 332     if (keys == NULL)
 333         return ENOMEM;
 334
 335     _kadm5_init_keys (keys, len);
 336
 337     for(i = 0; i < n_key_data; i++) {
 338         keys[i].mkvno = NULL;
 339         keys[i].key.keytype = key_data[i].key_data_type[0];
 340         ret = krb5_data_copy(&keys[i].key.keyvalue,
 341                              key_data[i].key_data_contents[0],
 342                              key_data[i].key_data_length[0]);
 343         if(ret)
 344             goto out;
 345         if(key_data[i].key_data_ver == 2) {
 346             Salt *salt;
 347
 348             salt = malloc(sizeof(*salt));
 349             if(salt == NULL) {
 350                 ret = ENOMEM;
 351                 goto out;
 352             }
 353             keys[i].salt = salt;
 354             salt->type = key_data[i].key_data_type[1];
 355             krb5_data_copy(&salt->salt,
 356                            key_data[i].key_data_contents[1],
 357                            key_data[i].key_data_length[1]);
 358         } else
 359             keys[i].salt = NULL;
 360     }
 361     _kadm5_free_keys (context, ent->keys.len, ent->keys.val);
 362     ent->keys.len = len;
 363     ent->keys.val = keys;
 364     ent->kvno++;
 365     return 0;
 366  out:
 367     _kadm5_free_keys (context, len, keys);
 368     return ret;
 369 }
 370
 371 /*
 372  * Set the keys of `ent' to `n_keys, keys'
 373  */
 374
 375 kadm5_ret_t
 376 _kadm5_set_keys3(kadm5_server_context *context,
 377                  hdb_entry *ent,
 378                  int n_keys,
 379                  krb5_keyblock *keyblocks)
 380 {
 381     krb5_error_code ret;
 382     int i;
 383     unsigned len;
 384     Key *keys;
 385
 386     len  = n_keys;
 387     keys = malloc (len * sizeof(*keys));
 388     if (keys == NULL)
 389         return ENOMEM;
 390
 391     _kadm5_init_keys (keys, len);
 392
 393     for(i = 0; i < n_keys; i++) {
 394         keys[i].mkvno = NULL;
 395         ret = krb5_copy_keyblock_contents (context->context,
 396                                            &keyblocks[i],
 397                                            &keys[i].key);
 398         if(ret)
 399             goto out;
 400         keys[i].salt = NULL;
 401     }
 402     _kadm5_free_keys (context, ent->keys.len, ent->keys.val);
 403     ent->keys.len = len;
 404     ent->keys.val = keys;
 405     ent->kvno++;
 406     return 0;
 407  out:
 408     _kadm5_free_keys (context, len, keys);
 409     return ret;
 410 }
 411
 412 /*
 413  * Set the keys of `ent' to random keys and return them in `n_keys'
 414  * and `new_keys'.
 415  */
 416
 417 kadm5_ret_t
 418 _kadm5_set_keys_randomly (kadm5_server_context *context,
 419                           hdb_entry *ent,
 420                           krb5_keyblock **new_keys,
 421                           int *n_keys)
 422 {
 423     kadm5_ret_t ret = 0;
 424     int i;
 425     unsigned len;
 426     krb5_keyblock *keys;
 427     Key *hkeys;
 428
 429     len  = n_des_types + 1;
 430     keys = malloc (len * sizeof(*keys));
 431     if (keys == NULL)
 432         return ENOMEM;
 433
 434     for (i = 0; i < len; ++i) {
 435         keys[i].keyvalue.length = 0;
 436         keys[i].keyvalue.data   = NULL;
 437     }
 438
 439     hkeys = malloc (len * sizeof(*hkeys));
 440     if (hkeys == NULL) {
 441         free (keys);
 442         return ENOMEM;
 443     }
 444
 445     _kadm5_init_keys (hkeys, len);
 446
 447     ret = krb5_generate_random_keyblock (context->context,
 448                                          des_types[0],
 449                                          &keys[0]);
 450     if (ret)
 451         goto out;
 452
 453     ret = krb5_copy_keyblock_contents (context->context,
 454                                        &keys[0],
 455                                        &hkeys[0].key);
 456     if (ret)
 457         goto out;
 458
 459     for (i = 1; i < n_des_types; ++i) {
 460         ret = krb5_copy_keyblock_contents (context->context,
 461                                            &keys[0],
 462                                            &keys[i]);
 463         if (ret)
 464             goto out;
 465         keys[i].keytype = des_types[i];
 466         ret = krb5_copy_keyblock_contents (context->context,
 467                                            &keys[0],
 468                                            &hkeys[i].key);
 469         if (ret)
 470             goto out;
 471         hkeys[i].key.keytype = des_types[i];
 472     }
 473
 474     ret = krb5_generate_random_keyblock (context->context,
 475                                          ETYPE_DES3_CBC_SHA1,
 476                                          &keys[n_des_types]);
 477     if (ret)
 478         goto out;
 479
 480     ret = krb5_copy_keyblock_contents (context->context,
 481                                        &keys[n_des_types],
 482                                        &hkeys[n_des_types].key);
 483     if (ret)
 484         goto out;
 485
 486     _kadm5_free_keys (context, ent->keys.len, ent->keys.val);
 487     ent->keys.len = len;
 488     ent->keys.val = hkeys;
 489     ent->kvno++;
 490     *new_keys     = keys;
 491     *n_keys       = len;
 492     return ret;
 493 out:
 494     for (i = 0; i < len; ++i)
 495         krb5_free_keyblock_contents (context->context, &keys[i]);
 496     free (keys);
 497     _kadm5_free_keys (context, len, hkeys);
 498     return ret;
 499 }