1 /* 2 * Copyright (c) 2004 - 2005 Kungliga Tekniska H�gskolan 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 RCSID("$Id: ext.c 21113 2007-06-18 12:59:32Z lha $"); 38 39 krb5_error_code 40 hdb_entry_check_mandatory(krb5_context context, const hdb_entry *ent) 41 { 42 int i; 43 44 if (ent->extensions == NULL) 45 return 0; 46 47 /* 48 * check for unknown extensions and if they where tagged mandatory 49 */ 50 51 for (i = 0; i < ent->extensions->len; i++) { 52 if (ent->extensions->val[i].data.element != 53 choice_HDB_extension_data_asn1_ellipsis) 54 continue; 55 if (ent->extensions->val[i].mandatory) { 56 krb5_set_error_string(context, "Principal have unknown " 57 "mandatory extension"); 58 return HDB_ERR_MANDATORY_OPTION; 59 } 60 } 61 return 0; 62 } 63 64 HDB_extension * 65 hdb_find_extension(const hdb_entry *entry, int type) 66 { 67 int i; 68 69 if (entry->extensions == NULL) 70 return NULL; 71 72 for (i = 0; i < entry->extensions->len; i++) 73 if (entry->extensions->val[i].data.element == type) 74 return &entry->extensions->val[i]; 75 return NULL; 76 } 77 78 /* 79 * Replace the extension `ext' in `entry'. Make a copy of the 80 * extension, so the caller must still free `ext' on both success and 81 * failure. Returns 0 or error code. 82 */ 83 84 krb5_error_code 85 hdb_replace_extension(krb5_context context, 86 hdb_entry *entry, 87 const HDB_extension *ext) 88 { 89 HDB_extension *ext2; 90 HDB_extension *es; 91 int ret; 92 93 ext2 = NULL; 94 95 if (entry->extensions == NULL) { 96 entry->extensions = calloc(1, sizeof(*entry->extensions)); 97 if (entry->extensions == NULL) { 98 krb5_set_error_string(context, "malloc: out of memory"); 99 return ENOMEM; 100 } 101 } else if (ext->data.element != choice_HDB_extension_data_asn1_ellipsis) { 102 ext2 = hdb_find_extension(entry, ext->data.element); 103 } else { 104 /* 105 * This is an unknown extention, and we are asked to replace a 106 * possible entry in `entry' that is of the same type. This 107 * might seem impossible, but ASN.1 CHOICE comes to our 108 * rescue. The first tag in each branch in the CHOICE is 109 * unique, so just find the element in the list that have the 110 * same tag was we are putting into the list. 111 */ 112 Der_class replace_class, list_class; 113 Der_type replace_type, list_type; 114 unsigned int replace_tag, list_tag; 115 size_t size; 116 int i; 117 118 ret = der_get_tag(ext->data.u.asn1_ellipsis.data, 119 ext->data.u.asn1_ellipsis.length, 120 &replace_class, &replace_type, &replace_tag, 121 &size); 122 if (ret) { 123 krb5_set_error_string(context, "hdb: failed to decode " 124 "replacement hdb extention"); 125 return ret; 126 } 127 128 for (i = 0; i < entry->extensions->len; i++) { 129 HDB_extension *ext3 = &entry->extensions->val[i]; 130 131 if (ext3->data.element != choice_HDB_extension_data_asn1_ellipsis) 132 continue; 133 134 ret = der_get_tag(ext3->data.u.asn1_ellipsis.data, 135 ext3->data.u.asn1_ellipsis.length, 136 &list_class, &list_type, &list_tag, 137 &size); 138 if (ret) { 139 krb5_set_error_string(context, "hdb: failed to decode " 140 "present hdb extention"); 141 return ret; 142 } 143 144 if (MAKE_TAG(replace_class,replace_type,replace_type) == 145 MAKE_TAG(list_class,list_type,list_type)) { 146 ext2 = ext3; 147 break; 148 } 149 } 150 } 151 152 if (ext2) { 153 free_HDB_extension(ext2); 154 ret = copy_HDB_extension(ext, ext2); 155 if (ret) 156 krb5_set_error_string(context, "hdb: failed to copy replacement " 157 "hdb extention"); 158 return ret; 159 } 160 161 es = realloc(entry->extensions->val, 162 (entry->extensions->len+1)*sizeof(entry->extensions->val[0])); 163 if (es == NULL) { 164 krb5_set_error_string(context, "malloc: out of memory"); 165 return ENOMEM; 166 } 167 entry->extensions->val = es; 168 169 ret = copy_HDB_extension(ext, 170 &entry->extensions->val[entry->extensions->len]); 171 if (ret == 0) 172 entry->extensions->len++; 173 else 174 krb5_set_error_string(context, "hdb: failed to copy new extension"); 175 176 return ret; 177 } 178 179 krb5_error_code 180 hdb_clear_extension(krb5_context context, 181 hdb_entry *entry, 182 int type) 183 { 184 int i; 185 186 if (entry->extensions == NULL) 187 return 0; 188 189 for (i = 0; i < entry->extensions->len; i++) { 190 if (entry->extensions->val[i].data.element == type) { 191 free_HDB_extension(&entry->extensions->val[i]); 192 memmove(&entry->extensions->val[i], 193 &entry->extensions->val[i + 1], 194 sizeof(entry->extensions->val[i]) * (entry->extensions->len - i - 1)); 195 entry->extensions->len--; 196 } 197 } 198 if (entry->extensions->len == 0) { 199 free(entry->extensions->val); 200 free(entry->extensions); 201 entry->extensions = NULL; 202 } 203 204 return 0; 205 } 206 207 208 krb5_error_code 209 hdb_entry_get_pkinit_acl(const hdb_entry *entry, const HDB_Ext_PKINIT_acl **a) 210 { 211 const HDB_extension *ext; 212 213 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_acl); 214 if (ext) 215 *a = &ext->data.u.pkinit_acl; 216 else 217 *a = NULL; 218 219 return 0; 220 } 221 222 krb5_error_code 223 hdb_entry_get_pkinit_hash(const hdb_entry *entry, const HDB_Ext_PKINIT_hash **a) 224 { 225 const HDB_extension *ext; 226 227 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert_hash); 228 if (ext) 229 *a = &ext->data.u.pkinit_cert_hash; 230 else 231 *a = NULL; 232 233 return 0; 234 } 235 236 krb5_error_code 237 hdb_entry_get_pw_change_time(const hdb_entry *entry, time_t *t) 238 { 239 const HDB_extension *ext; 240 241 ext = hdb_find_extension(entry, choice_HDB_extension_data_last_pw_change); 242 if (ext) 243 *t = ext->data.u.last_pw_change; 244 else 245 *t = 0; 246 247 return 0; 248 } 249 250 krb5_error_code 251 hdb_entry_set_pw_change_time(krb5_context context, 252 hdb_entry *entry, 253 time_t t) 254 { 255 HDB_extension ext; 256 257 ext.mandatory = FALSE; 258 ext.data.element = choice_HDB_extension_data_last_pw_change; 259 if (t == 0) 260 t = time(NULL); 261 ext.data.u.last_pw_change = t; 262 263 return hdb_replace_extension(context, entry, &ext); 264 } 265 266 int 267 hdb_entry_get_password(krb5_context context, HDB *db, 268 const hdb_entry *entry, char **p) 269 { 270 HDB_extension *ext; 271 char *str; 272 int ret; 273 274 ext = hdb_find_extension(entry, choice_HDB_extension_data_password); 275 if (ext) { 276 heim_utf8_string str; 277 heim_octet_string pw; 278 279 if (db->hdb_master_key_set && ext->data.u.password.mkvno) { 280 hdb_master_key key; 281 282 key = _hdb_find_master_key(ext->data.u.password.mkvno, 283 db->hdb_master_key); 284 285 if (key == NULL) { 286 krb5_set_error_string(context, "master key %d missing", 287 *ext->data.u.password.mkvno); 288 return HDB_ERR_NO_MKEY; 289 } 290 291 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY, 292 ext->data.u.password.password.data, 293 ext->data.u.password.password.length, 294 &pw); 295 } else { 296 ret = der_copy_octet_string(&ext->data.u.password.password, &pw); 297 } 298 if (ret) { 299 krb5_clear_error_string(context); 300 return ret; 301 } 302 303 str = pw.data; 304 if (str[pw.length - 1] != '\0') { 305 krb5_set_error_string(context, "password malformated"); 306 return EINVAL; 307 } 308 309 *p = strdup(str); 310 311 der_free_octet_string(&pw); 312 if (*p == NULL) { 313 krb5_set_error_string(context, "malloc: out of memory"); 314 return ENOMEM; 315 } 316 return 0; 317 } 318 319 ret = krb5_unparse_name(context, entry->principal, &str); 320 if (ret == 0) { 321 krb5_set_error_string(context, "no password attributefor %s", str); 322 free(str); 323 } else 324 krb5_clear_error_string(context); 325 326 return ENOENT; 327 } 328 329 int 330 hdb_entry_set_password(krb5_context context, HDB *db, 331 hdb_entry *entry, const char *p) 332 { 333 HDB_extension ext; 334 hdb_master_key key; 335 int ret; 336 337 ext.mandatory = FALSE; 338 ext.data.element = choice_HDB_extension_data_password; 339 340 if (db->hdb_master_key_set) { 341 342 key = _hdb_find_master_key(NULL, db->hdb_master_key); 343 if (key == NULL) { 344 krb5_set_error_string(context, "hdb_entry_set_password: " 345 "failed to find masterkey"); 346 return HDB_ERR_NO_MKEY; 347 } 348 349 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY, 350 p, strlen(p) + 1, 351 &ext.data.u.password.password); 352 if (ret) 353 return ret; 354 355 ext.data.u.password.mkvno = 356 malloc(sizeof(*ext.data.u.password.mkvno)); 357 if (ext.data.u.password.mkvno == NULL) { 358 free_HDB_extension(&ext); 359 krb5_set_error_string(context, "malloc: out of memory"); 360 return ENOMEM; 361 } 362 *ext.data.u.password.mkvno = _hdb_mkey_version(key); 363 364 } else { 365 ext.data.u.password.mkvno = NULL; 366 367 ret = krb5_data_copy(&ext.data.u.password.password, 368 p, strlen(p) + 1); 369 if (ret) { 370 krb5_set_error_string(context, "malloc: out of memory"); 371 free_HDB_extension(&ext); 372 return ret; 373 } 374 } 375 376 ret = hdb_replace_extension(context, entry, &ext); 377 378 free_HDB_extension(&ext); 379 380 return ret; 381 } 382 383 int 384 hdb_entry_clear_password(krb5_context context, hdb_entry *entry) 385 { 386 return hdb_clear_extension(context, entry, 387 choice_HDB_extension_data_password); 388 } 389 390 krb5_error_code 391 hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry, 392 const HDB_Ext_Constrained_delegation_acl **a) 393 { 394 const HDB_extension *ext; 395 396 ext = hdb_find_extension(entry, 397 choice_HDB_extension_data_allowed_to_delegate_to); 398 if (ext) 399 *a = &ext->data.u.allowed_to_delegate_to; 400 else 401 *a = NULL; 402 403 return 0; 404 } 405 406 krb5_error_code 407 hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a) 408 { 409 const HDB_extension *ext; 410 411 ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases); 412 if (ext) 413 *a = &ext->data.u.aliases; 414 else 415 *a = NULL; 416 417 return 0; 418 } 419