1 /* 2 * Copyright (c) 2004 - 2005 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 "hdb_locl.h" 35 #include <der.h> 36 37 krb5_error_code 38 hdb_entry_check_mandatory(krb5_context context, const hdb_entry *ent) 39 { 40 size_t i; 41 42 if (ent->extensions == NULL) 43 return 0; 44 45 /* 46 * check for unknown extensions and if they where tagged mandatory 47 */ 48 49 for (i = 0; i < ent->extensions->len; i++) { 50 if (ent->extensions->val[i].data.element != 51 choice_HDB_extension_data_asn1_ellipsis) 52 continue; 53 if (ent->extensions->val[i].mandatory) { 54 krb5_set_error_message(context, HDB_ERR_MANDATORY_OPTION, 55 "Principal have unknown " 56 "mandatory extension"); 57 return HDB_ERR_MANDATORY_OPTION; 58 } 59 } 60 return 0; 61 } 62 63 HDB_extension * 64 hdb_find_extension(const hdb_entry *entry, int type) 65 { 66 size_t i; 67 68 if (entry->extensions == NULL) 69 return NULL; 70 71 for (i = 0; i < entry->extensions->len; i++) 72 if (entry->extensions->val[i].data.element == (unsigned)type) 73 return &entry->extensions->val[i]; 74 return NULL; 75 } 76 77 /* 78 * Replace the extension `ext' in `entry'. Make a copy of the 79 * extension, so the caller must still free `ext' on both success and 80 * failure. Returns 0 or error code. 81 */ 82 83 krb5_error_code 84 hdb_replace_extension(krb5_context context, 85 hdb_entry *entry, 86 const HDB_extension *ext) 87 { 88 HDB_extension *ext2; 89 HDB_extension *es; 90 int ret; 91 92 ext2 = NULL; 93 94 if (entry->extensions == NULL) { 95 entry->extensions = calloc(1, sizeof(*entry->extensions)); 96 if (entry->extensions == NULL) { 97 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 98 return ENOMEM; 99 } 100 } else if (ext->data.element != choice_HDB_extension_data_asn1_ellipsis) { 101 ext2 = hdb_find_extension(entry, ext->data.element); 102 } else { 103 /* 104 * This is an unknown extention, and we are asked to replace a 105 * possible entry in `entry' that is of the same type. This 106 * might seem impossible, but ASN.1 CHOICE comes to our 107 * rescue. The first tag in each branch in the CHOICE is 108 * unique, so just find the element in the list that have the 109 * same tag was we are putting into the list. 110 */ 111 Der_class replace_class, list_class; 112 Der_type replace_type, list_type; 113 unsigned int replace_tag, list_tag; 114 size_t size; 115 size_t i; 116 117 ret = der_get_tag(ext->data.u.asn1_ellipsis.data, 118 ext->data.u.asn1_ellipsis.length, 119 &replace_class, &replace_type, &replace_tag, 120 &size); 121 if (ret) { 122 krb5_set_error_message(context, ret, "hdb: failed to decode " 123 "replacement hdb extention"); 124 return ret; 125 } 126 127 for (i = 0; i < entry->extensions->len; i++) { 128 HDB_extension *ext3 = &entry->extensions->val[i]; 129 130 if (ext3->data.element != choice_HDB_extension_data_asn1_ellipsis) 131 continue; 132 133 ret = der_get_tag(ext3->data.u.asn1_ellipsis.data, 134 ext3->data.u.asn1_ellipsis.length, 135 &list_class, &list_type, &list_tag, 136 &size); 137 if (ret) { 138 krb5_set_error_message(context, ret, "hdb: failed to decode " 139 "present hdb extention"); 140 return ret; 141 } 142 143 if (MAKE_TAG(replace_class,replace_type,replace_type) == 144 MAKE_TAG(list_class,list_type,list_type)) { 145 ext2 = ext3; 146 break; 147 } 148 } 149 } 150 151 if (ext2) { 152 free_HDB_extension(ext2); 153 ret = copy_HDB_extension(ext, ext2); 154 if (ret) 155 krb5_set_error_message(context, ret, "hdb: failed to copy replacement " 156 "hdb extention"); 157 return ret; 158 } 159 160 es = realloc(entry->extensions->val, 161 (entry->extensions->len+1)*sizeof(entry->extensions->val[0])); 162 if (es == NULL) { 163 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 164 return ENOMEM; 165 } 166 entry->extensions->val = es; 167 168 ret = copy_HDB_extension(ext, 169 &entry->extensions->val[entry->extensions->len]); 170 if (ret == 0) 171 entry->extensions->len++; 172 else 173 krb5_set_error_message(context, ret, "hdb: failed to copy new extension"); 174 175 return ret; 176 } 177 178 krb5_error_code 179 hdb_clear_extension(krb5_context context, 180 hdb_entry *entry, 181 int type) 182 { 183 size_t i; 184 185 if (entry->extensions == NULL) 186 return 0; 187 188 for (i = 0; i < entry->extensions->len; i++) { 189 if (entry->extensions->val[i].data.element == (unsigned)type) { 190 free_HDB_extension(&entry->extensions->val[i]); 191 memmove(&entry->extensions->val[i], 192 &entry->extensions->val[i + 1], 193 sizeof(entry->extensions->val[i]) * (entry->extensions->len - i - 1)); 194 entry->extensions->len--; 195 } 196 } 197 if (entry->extensions->len == 0) { 198 free(entry->extensions->val); 199 free(entry->extensions); 200 entry->extensions = NULL; 201 } 202 203 return 0; 204 } 205 206 207 krb5_error_code 208 hdb_entry_get_pkinit_acl(const hdb_entry *entry, const HDB_Ext_PKINIT_acl **a) 209 { 210 const HDB_extension *ext; 211 212 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_acl); 213 if (ext) 214 *a = &ext->data.u.pkinit_acl; 215 else 216 *a = NULL; 217 218 return 0; 219 } 220 221 krb5_error_code 222 hdb_entry_get_pkinit_hash(const hdb_entry *entry, const HDB_Ext_PKINIT_hash **a) 223 { 224 const HDB_extension *ext; 225 226 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert_hash); 227 if (ext) 228 *a = &ext->data.u.pkinit_cert_hash; 229 else 230 *a = NULL; 231 232 return 0; 233 } 234 235 krb5_error_code 236 hdb_entry_get_pkinit_cert(const hdb_entry *entry, const HDB_Ext_PKINIT_cert **a) 237 { 238 const HDB_extension *ext; 239 240 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert); 241 if (ext) 242 *a = &ext->data.u.pkinit_cert; 243 else 244 *a = NULL; 245 246 return 0; 247 } 248 249 krb5_error_code 250 hdb_entry_get_pw_change_time(const hdb_entry *entry, time_t *t) 251 { 252 const HDB_extension *ext; 253 254 ext = hdb_find_extension(entry, choice_HDB_extension_data_last_pw_change); 255 if (ext) 256 *t = ext->data.u.last_pw_change; 257 else 258 *t = 0; 259 260 return 0; 261 } 262 263 krb5_error_code 264 hdb_entry_set_pw_change_time(krb5_context context, 265 hdb_entry *entry, 266 time_t t) 267 { 268 HDB_extension ext; 269 270 ext.mandatory = FALSE; 271 ext.data.element = choice_HDB_extension_data_last_pw_change; 272 if (t == 0) 273 t = time(NULL); 274 ext.data.u.last_pw_change = t; 275 276 return hdb_replace_extension(context, entry, &ext); 277 } 278 279 int 280 hdb_entry_get_password(krb5_context context, HDB *db, 281 const hdb_entry *entry, char **p) 282 { 283 HDB_extension *ext; 284 char *str; 285 int ret; 286 287 ext = hdb_find_extension(entry, choice_HDB_extension_data_password); 288 if (ext) { 289 heim_utf8_string xstr; 290 heim_octet_string pw; 291 292 if (db->hdb_master_key_set && ext->data.u.password.mkvno) { 293 hdb_master_key key; 294 295 key = _hdb_find_master_key(ext->data.u.password.mkvno, 296 db->hdb_master_key); 297 298 if (key == NULL) { 299 krb5_set_error_message(context, HDB_ERR_NO_MKEY, 300 "master key %d missing", 301 *ext->data.u.password.mkvno); 302 return HDB_ERR_NO_MKEY; 303 } 304 305 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY, 306 ext->data.u.password.password.data, 307 ext->data.u.password.password.length, 308 &pw); 309 } else { 310 ret = der_copy_octet_string(&ext->data.u.password.password, &pw); 311 } 312 if (ret) { 313 krb5_clear_error_message(context); 314 return ret; 315 } 316 317 xstr = pw.data; 318 if (xstr[pw.length - 1] != '\0') { 319 krb5_set_error_message(context, EINVAL, "malformed password"); 320 return EINVAL; 321 } 322 323 *p = strdup(xstr); 324 325 der_free_octet_string(&pw); 326 if (*p == NULL) { 327 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 328 return ENOMEM; 329 } 330 return 0; 331 } 332 333 ret = krb5_unparse_name(context, entry->principal, &str); 334 if (ret == 0) { 335 krb5_set_error_message(context, ENOENT, 336 "no password attribute for %s", str); 337 free(str); 338 } else 339 krb5_clear_error_message(context); 340 341 return ENOENT; 342 } 343 344 int 345 hdb_entry_set_password(krb5_context context, HDB *db, 346 hdb_entry *entry, const char *p) 347 { 348 HDB_extension ext; 349 hdb_master_key key; 350 int ret; 351 352 ext.mandatory = FALSE; 353 ext.data.element = choice_HDB_extension_data_password; 354 355 if (db->hdb_master_key_set) { 356 357 key = _hdb_find_master_key(NULL, db->hdb_master_key); 358 if (key == NULL) { 359 krb5_set_error_message(context, HDB_ERR_NO_MKEY, 360 "hdb_entry_set_password: " 361 "failed to find masterkey"); 362 return HDB_ERR_NO_MKEY; 363 } 364 365 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY, 366 p, strlen(p) + 1, 367 &ext.data.u.password.password); 368 if (ret) 369 return ret; 370 371 ext.data.u.password.mkvno = 372 malloc(sizeof(*ext.data.u.password.mkvno)); 373 if (ext.data.u.password.mkvno == NULL) { 374 free_HDB_extension(&ext); 375 krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); 376 return ENOMEM; 377 } 378 *ext.data.u.password.mkvno = _hdb_mkey_version(key); 379 380 } else { 381 ext.data.u.password.mkvno = NULL; 382 383 ret = krb5_data_copy(&ext.data.u.password.password, 384 p, strlen(p) + 1); 385 if (ret) { 386 krb5_set_error_message(context, ret, "malloc: out of memory"); 387 free_HDB_extension(&ext); 388 return ret; 389 } 390 } 391 392 ret = hdb_replace_extension(context, entry, &ext); 393 394 free_HDB_extension(&ext); 395 396 return ret; 397 } 398 399 int 400 hdb_entry_clear_password(krb5_context context, hdb_entry *entry) 401 { 402 return hdb_clear_extension(context, entry, 403 choice_HDB_extension_data_password); 404 } 405 406 krb5_error_code 407 hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry, 408 const HDB_Ext_Constrained_delegation_acl **a) 409 { 410 const HDB_extension *ext; 411 412 ext = hdb_find_extension(entry, 413 choice_HDB_extension_data_allowed_to_delegate_to); 414 if (ext) 415 *a = &ext->data.u.allowed_to_delegate_to; 416 else 417 *a = NULL; 418 419 return 0; 420 } 421 422 krb5_error_code 423 hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a) 424 { 425 const HDB_extension *ext; 426 427 ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases); 428 if (ext) 429 *a = &ext->data.u.aliases; 430 else 431 *a = NULL; 432 433 return 0; 434 } 435