lib/hdb/ext.c

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