lib/hdb/common.c

   1 /*
   2  * Copyright (c) 1997-2002 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
  36 int
  37 hdb_principal2key(krb5_context context, krb5_const_principal p, krb5_data *key)
  38 {
  39     Principal new;
  40     size_t len = 0;
  41     int ret;
  42
  43     ret = copy_Principal(p, &new);
  44     if(ret)
  45         return ret;
  46     new.name.name_type = 0;
  47
  48     ASN1_MALLOC_ENCODE(Principal, key->data, key->length, &new, &len, ret);
  49     if (ret == 0 && key->length != len)
  50         krb5_abortx(context, "internal asn.1 encoder error");
  51     free_Principal(&new);
  52     return ret;
  53 }
  54
  55 int
  56 hdb_key2principal(krb5_context context, krb5_data *key, krb5_principal p)
  57 {
  58     return decode_Principal(key->data, key->length, p, NULL);
  59 }
  60
  61 int
  62 hdb_entry2value(krb5_context context, const hdb_entry *ent, krb5_data *value)
  63 {
  64     size_t len = 0;
  65     int ret;
  66
  67     ASN1_MALLOC_ENCODE(hdb_entry, value->data, value->length, ent, &len, ret);
  68     if (ret == 0 && value->length != len)
  69         krb5_abortx(context, "internal asn.1 encoder error");
  70     return ret;
  71 }
  72
  73 int
  74 hdb_value2entry(krb5_context context, krb5_data *value, hdb_entry *ent)
  75 {
  76     return decode_hdb_entry(value->data, value->length, ent, NULL);
  77 }
  78
  79 int
  80 hdb_entry_alias2value(krb5_context context,
  81                       const hdb_entry_alias *alias,
  82                       krb5_data *value)
  83 {
  84     size_t len = 0;
  85     int ret;
  86
  87     ASN1_MALLOC_ENCODE(hdb_entry_alias, value->data, value->length,
  88                        alias, &len, ret);
  89     if (ret == 0 && value->length != len)
  90         krb5_abortx(context, "internal asn.1 encoder error");
  91     return ret;
  92 }
  93
  94 int
  95 hdb_value2entry_alias(krb5_context context, krb5_data *value,
  96                       hdb_entry_alias *ent)
  97 {
  98     return decode_hdb_entry_alias(value->data, value->length, ent, NULL);
  99 }
 100
 101 krb5_error_code
 102 _hdb_fetch_kvno(krb5_context context, HDB *db, krb5_const_principal principal,
 103                 unsigned flags, krb5_kvno kvno, hdb_entry_ex *entry)
 104 {
 105     krb5_principal enterprise_principal = NULL;
 106     krb5_data key, value;
 107     krb5_error_code ret;
 108
 109     if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
 110         if (principal->name.name_string.len != 1) {
 111             ret = KRB5_PARSE_MALFORMED;
 112             krb5_set_error_message(context, ret, "malformed principal: "
 113                                    "enterprise name with %d name components",
 114                                    principal->name.name_string.len);
 115             return ret;
 116         }
 117         ret = krb5_parse_name(context, principal->name.name_string.val[0],
 118                               &enterprise_principal);
 119         if (ret)
 120             return ret;
 121         principal = enterprise_principal;
 122     }
 123
 124     hdb_principal2key(context, principal, &key);
 125     if (enterprise_principal)
 126         krb5_free_principal(context, enterprise_principal);
 127     ret = db->hdb__get(context, db, key, &value);
 128     krb5_data_free(&key);
 129     if(ret)
 130         return ret;
 131     ret = hdb_value2entry(context, &value, &entry->entry);
 132     if (ret == ASN1_BAD_ID && (flags & HDB_F_CANON) == 0) {
 133         krb5_data_free(&value);
 134         return HDB_ERR_NOENTRY;
 135     } else if (ret == ASN1_BAD_ID) {
 136         hdb_entry_alias alias;
 137
 138         ret = hdb_value2entry_alias(context, &value, &alias);
 139         if (ret) {
 140             krb5_data_free(&value);
 141             return ret;
 142         }
 143         hdb_principal2key(context, alias.principal, &key);
 144         krb5_data_free(&value);
 145         free_hdb_entry_alias(&alias);
 146
 147         ret = db->hdb__get(context, db, key, &value);
 148         krb5_data_free(&key);
 149         if (ret)
 150             return ret;
 151         ret = hdb_value2entry(context, &value, &entry->entry);
 152         if (ret) {
 153             krb5_data_free(&value);
 154             return ret;
 155         }
 156     }
 157     krb5_data_free(&value);
 158     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 159         if ((flags & HDB_F_KVNO_SPECIFIED) == 0 &&
 160             (flags & HDB_F_CURRENT_KVNO) == 0) {
 161
 162             /*
 163              * Decrypt all the old keys too, since we don't know which
 164              * the caller will need.
 165              */
 166             ret = hdb_unseal_keys_kvno(context, db, 0, &entry->entry);
 167             if (ret) {
 168                 hdb_free_entry(context, entry);
 169                 return ret;
 170             }
 171         } else if ((flags & HDB_F_KVNO_SPECIFIED) != 0 &&
 172             kvno != entry->entry.kvno &&
 173             kvno < entry->entry.kvno &&
 174             kvno > 0) {
 175
 176             /* Decrypt the keys we were asked for, if not the current ones */
 177             ret = hdb_unseal_keys_kvno(context, db, kvno, &entry->entry);
 178             if (ret) {
 179                 hdb_free_entry(context, entry);
 180                 return ret;
 181             }
 182         }
 183
 184         /* Always decrypt the current keys too */
 185         ret = hdb_unseal_keys(context, db, &entry->entry);
 186         if (ret) {
 187             hdb_free_entry(context, entry);
 188             return ret;
 189         }
 190     }
 191
 192     return ret;
 193 }
 194
 195 static krb5_error_code
 196 hdb_remove_aliases(krb5_context context, HDB *db, krb5_data *key)
 197 {
 198     const HDB_Ext_Aliases *aliases;
 199     krb5_error_code code;
 200     hdb_entry oldentry;
 201     krb5_data value;
 202     size_t i;
 203
 204     code = db->hdb__get(context, db, *key, &value);
 205     if (code == HDB_ERR_NOENTRY)
 206         return 0;
 207     else if (code)
 208         return code;
 209
 210     code = hdb_value2entry(context, &value, &oldentry);
 211     krb5_data_free(&value);
 212     if (code)
 213         return code;
 214
 215     code = hdb_entry_get_aliases(&oldentry, &aliases);
 216     if (code || aliases == NULL) {
 217         free_hdb_entry(&oldentry);
 218         return code;
 219     }
 220     for (i = 0; i < aliases->aliases.len; i++) {
 221         krb5_data akey;
 222
 223         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 224         code = db->hdb__del(context, db, akey);
 225         krb5_data_free(&akey);
 226         if (code) {
 227             free_hdb_entry(&oldentry);
 228             return code;
 229         }
 230     }
 231     free_hdb_entry(&oldentry);
 232     return 0;
 233 }
 234
 235 static krb5_error_code
 236 hdb_add_aliases(krb5_context context, HDB *db,
 237                 unsigned flags, hdb_entry_ex *entry)
 238 {
 239     const HDB_Ext_Aliases *aliases;
 240     krb5_error_code code;
 241     krb5_data key, value;
 242     size_t i;
 243
 244     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 245     if (code || aliases == NULL)
 246         return code;
 247
 248     for (i = 0; i < aliases->aliases.len; i++) {
 249         hdb_entry_alias entryalias;
 250         entryalias.principal = entry->entry.principal;
 251
 252         hdb_principal2key(context, &aliases->aliases.val[i], &key);
 253         code = hdb_entry_alias2value(context, &entryalias, &value);
 254         if (code) {
 255             krb5_data_free(&key);
 256             return code;
 257         }
 258         code = db->hdb__put(context, db, flags, key, value);
 259         krb5_data_free(&key);
 260         krb5_data_free(&value);
 261         if (code)
 262             return code;
 263     }
 264     return 0;
 265 }
 266
 267 static krb5_error_code
 268 hdb_check_aliases(krb5_context context, HDB *db, hdb_entry_ex *entry)
 269 {
 270     const HDB_Ext_Aliases *aliases;
 271     int code;
 272     size_t i;
 273
 274     /* check if new aliases already is used */
 275
 276     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 277     if (code)
 278         return code;
 279
 280     for (i = 0; aliases && i < aliases->aliases.len; i++) {
 281         hdb_entry_alias alias;
 282         krb5_data akey, value;
 283
 284         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 285         code = db->hdb__get(context, db, akey, &value);
 286         krb5_data_free(&akey);
 287         if (code == HDB_ERR_NOENTRY)
 288             continue;
 289         else if (code)
 290             return code;
 291
 292         code = hdb_value2entry_alias(context, &value, &alias);
 293         krb5_data_free(&value);
 294
 295         if (code == ASN1_BAD_ID)
 296             return HDB_ERR_EXISTS;
 297         else if (code)
 298             return code;
 299
 300         code = krb5_principal_compare(context, alias.principal,
 301                                       entry->entry.principal);
 302         free_hdb_entry_alias(&alias);
 303         if (code == 0)
 304             return HDB_ERR_EXISTS;
 305     }
 306     return 0;
 307 }
 308
 309 krb5_error_code
 310 _hdb_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 311 {
 312     krb5_data key, value;
 313     int code;
 314
 315     /* check if new aliases already is used */
 316     code = hdb_check_aliases(context, db, entry);
 317     if (code)
 318         return code;
 319
 320     if(entry->entry.generation == NULL) {
 321         struct timeval t;
 322         entry->entry.generation = malloc(sizeof(*entry->entry.generation));
 323         if(entry->entry.generation == NULL) {
 324             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 325             return ENOMEM;
 326         }
 327         gettimeofday(&t, NULL);
 328         entry->entry.generation->time = t.tv_sec;
 329         entry->entry.generation->usec = t.tv_usec;
 330         entry->entry.generation->gen = 0;
 331     } else
 332         entry->entry.generation->gen++;
 333
 334     code = hdb_seal_keys(context, db, &entry->entry);
 335     if (code)
 336         return code;
 337
 338     hdb_principal2key(context, entry->entry.principal, &key);
 339
 340     /* remove aliases */
 341     code = hdb_remove_aliases(context, db, &key);
 342     if (code) {
 343         krb5_data_free(&key);
 344         return code;
 345     }
 346     hdb_entry2value(context, &entry->entry, &value);
 347     code = db->hdb__put(context, db, flags & HDB_F_REPLACE, key, value);
 348     krb5_data_free(&value);
 349     krb5_data_free(&key);
 350     if (code)
 351         return code;
 352
 353     code = hdb_add_aliases(context, db, flags, entry);
 354
 355     return code;
 356 }
 357
 358 krb5_error_code
 359 _hdb_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 360 {
 361     krb5_data key;
 362     int code;
 363
 364     hdb_principal2key(context, principal, &key);
 365
 366     code = hdb_remove_aliases(context, db, &key);
 367     if (code) {
 368         krb5_data_free(&key);
 369         return code;
 370     }
 371     code = db->hdb__del(context, db, key);
 372     krb5_data_free(&key);
 373     return code;
 374 }
 375