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;
  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;
  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;
  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(krb5_context context, HDB *db, krb5_const_principal principal,
 103            unsigned flags, hdb_entry_ex *entry)
 104 {
 105     krb5_principal enterprise_principal = NULL;
 106     krb5_data key, value;
 107     int code;
 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, principal);
 127     code = db->hdb__get(context, db, key, &value);
 128     krb5_data_free(&key);
 129     if(code)
 130         return code;
 131     code = hdb_value2entry(context, &value, &entry->entry);
 132     if (code == ASN1_BAD_ID && (flags & HDB_F_CANON) == 0) {
 133         krb5_data_free(&value);
 134         return HDB_ERR_NOENTRY;
 135     } else if (code == ASN1_BAD_ID) {
 136         hdb_entry_alias alias;
 137
 138         code = hdb_value2entry_alias(context, &value, &alias);
 139         if (code) {
 140             krb5_data_free(&value);
 141             return code;
 142         }
 143         hdb_principal2key(context, alias.principal, &key);
 144         krb5_data_free(&value);
 145         free_hdb_entry_alias(&alias);
 146
 147         code = db->hdb__get(context, db, key, &value);
 148         krb5_data_free(&key);
 149         if (code)
 150             return code;
 151         code = hdb_value2entry(context, &value, &entry->entry);
 152         if (code) {
 153             krb5_data_free(&value);
 154             return code;
 155         }
 156     }
 157     krb5_data_free(&value);
 158     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 159         code = hdb_unseal_keys (context, db, &entry->entry);
 160         if (code)
 161             hdb_free_entry(context, entry);
 162     }
 163     return code;
 164 }
 165
 166 static krb5_error_code
 167 hdb_remove_aliases(krb5_context context, HDB *db, krb5_data *key)
 168 {
 169     const HDB_Ext_Aliases *aliases;
 170     krb5_error_code code;
 171     hdb_entry oldentry;
 172     krb5_data value;
 173     int i;
 174
 175     code = db->hdb__get(context, db, *key, &value);
 176     if (code == HDB_ERR_NOENTRY)
 177         return 0;
 178     else if (code)
 179         return code;
 180
 181     code = hdb_value2entry(context, &value, &oldentry);
 182     krb5_data_free(&value);
 183     if (code)
 184         return code;
 185
 186     code = hdb_entry_get_aliases(&oldentry, &aliases);
 187     if (code || aliases == NULL) {
 188         free_hdb_entry(&oldentry);
 189         return code;
 190     }
 191     for (i = 0; i < aliases->aliases.len; i++) {
 192         krb5_data akey;
 193
 194         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 195         code = db->hdb__del(context, db, akey);
 196         krb5_data_free(&akey);
 197         if (code) {
 198             free_hdb_entry(&oldentry);
 199             return code;
 200         }
 201     }
 202     free_hdb_entry(&oldentry);
 203     return 0;
 204 }
 205
 206 static krb5_error_code
 207 hdb_add_aliases(krb5_context context, HDB *db,
 208                 unsigned flags, hdb_entry_ex *entry)
 209 {
 210     const HDB_Ext_Aliases *aliases;
 211     krb5_error_code code;
 212     krb5_data key, value;
 213     int i;
 214
 215     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 216     if (code || aliases == NULL)
 217         return code;
 218
 219     for (i = 0; i < aliases->aliases.len; i++) {
 220         hdb_entry_alias entryalias;
 221         entryalias.principal = entry->entry.principal;
 222
 223         hdb_principal2key(context, &aliases->aliases.val[i], &key);
 224         code = hdb_entry_alias2value(context, &entryalias, &value);
 225         if (code) {
 226             krb5_data_free(&key);
 227             return code;
 228         }
 229         code = db->hdb__put(context, db, flags, key, value);
 230         krb5_data_free(&key);
 231         krb5_data_free(&value);
 232         if (code)
 233             return code;
 234     }
 235     return 0;
 236 }
 237
 238 static krb5_error_code
 239 hdb_check_aliases(krb5_context context, HDB *db, hdb_entry_ex *entry)
 240 {
 241     const HDB_Ext_Aliases *aliases;
 242     int code, i;
 243
 244     /* check if new aliases already is used */
 245
 246     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 247     if (code)
 248         return code;
 249
 250     for (i = 0; aliases && i < aliases->aliases.len; i++) {
 251         hdb_entry_alias alias;
 252         krb5_data akey, value;
 253
 254         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 255         code = db->hdb__get(context, db, akey, &value);
 256         krb5_data_free(&akey);
 257         if (code == HDB_ERR_NOENTRY)
 258             continue;
 259         else if (code)
 260             return code;
 261
 262         code = hdb_value2entry_alias(context, &value, &alias);
 263         krb5_data_free(&value);
 264
 265         if (code == ASN1_BAD_ID)
 266             return HDB_ERR_EXISTS;
 267         else if (code)
 268             return code;
 269
 270         code = krb5_principal_compare(context, alias.principal,
 271                                       entry->entry.principal);
 272         free_hdb_entry_alias(&alias);
 273         if (code == 0)
 274             return HDB_ERR_EXISTS;
 275     }
 276     return 0;
 277 }
 278
 279 krb5_error_code
 280 _hdb_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 281 {
 282     krb5_data key, value;
 283     int code;
 284
 285     /* check if new aliases already is used */
 286     code = hdb_check_aliases(context, db, entry);
 287     if (code)
 288         return code;
 289
 290     if(entry->entry.generation == NULL) {
 291         struct timeval t;
 292         entry->entry.generation = malloc(sizeof(*entry->entry.generation));
 293         if(entry->entry.generation == NULL) {
 294             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 295             return ENOMEM;
 296         }
 297         gettimeofday(&t, NULL);
 298         entry->entry.generation->time = t.tv_sec;
 299         entry->entry.generation->usec = t.tv_usec;
 300         entry->entry.generation->gen = 0;
 301     } else
 302         entry->entry.generation->gen++;
 303
 304     code = hdb_seal_keys(context, db, &entry->entry);
 305     if (code)
 306         return code;
 307
 308     hdb_principal2key(context, entry->entry.principal, &key);
 309
 310     /* remove aliases */
 311     code = hdb_remove_aliases(context, db, &key);
 312     if (code) {
 313         krb5_data_free(&key);
 314         return code;
 315     }
 316     hdb_entry2value(context, &entry->entry, &value);
 317     code = db->hdb__put(context, db, flags & HDB_F_REPLACE, key, value);
 318     krb5_data_free(&value);
 319     krb5_data_free(&key);
 320     if (code)
 321         return code;
 322
 323     code = hdb_add_aliases(context, db, flags, entry);
 324
 325     return code;
 326 }
 327
 328 krb5_error_code
 329 _hdb_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 330 {
 331     krb5_data key;
 332     int code;
 333
 334     hdb_principal2key(context, principal, &key);
 335
 336     code = hdb_remove_aliases(context, db, &key);
 337     if (code) {
 338         krb5_data_free(&key);
 339         return code;
 340     }
 341     code = db->hdb__del(context, db, key);
 342     krb5_data_free(&key);
 343     return code;
 344 }
 345