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     int code;
 109
 110     if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
 111         if (principal->name.name_string.len != 1) {
 112             ret = KRB5_PARSE_MALFORMED;
 113             krb5_set_error_message(context, ret, "malformed principal: "
 114                                    "enterprise name with %d name components",
 115                                    principal->name.name_string.len);
 116             return ret;
 117         }
 118         ret = krb5_parse_name(context, principal->name.name_string.val[0],
 119                               &enterprise_principal);
 120         if (ret)
 121             return ret;
 122         principal = enterprise_principal;
 123     }
 124
 125     hdb_principal2key(context, principal, &key);
 126     if (enterprise_principal)
 127         krb5_free_principal(context, enterprise_principal);
 128     code = db->hdb__get(context, db, key, &value);
 129     krb5_data_free(&key);
 130     if(code)
 131         return code;
 132     code = hdb_value2entry(context, &value, &entry->entry);
 133     if (code == ASN1_BAD_ID && (flags & HDB_F_CANON) == 0) {
 134         krb5_data_free(&value);
 135         return HDB_ERR_NOENTRY;
 136     } else if (code == ASN1_BAD_ID) {
 137         hdb_entry_alias alias;
 138
 139         code = hdb_value2entry_alias(context, &value, &alias);
 140         if (code) {
 141             krb5_data_free(&value);
 142             return code;
 143         }
 144         hdb_principal2key(context, alias.principal, &key);
 145         krb5_data_free(&value);
 146         free_hdb_entry_alias(&alias);
 147
 148         code = db->hdb__get(context, db, key, &value);
 149         krb5_data_free(&key);
 150         if (code)
 151             return code;
 152         code = hdb_value2entry(context, &value, &entry->entry);
 153         if (code) {
 154             krb5_data_free(&value);
 155             return code;
 156         }
 157     }
 158     krb5_data_free(&value);
 159     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 160         code = hdb_unseal_keys (context, db, &entry->entry);
 161         if (code)
 162             hdb_free_entry(context, entry);
 163     }
 164     return code;
 165 }
 166
 167 static krb5_error_code
 168 hdb_remove_aliases(krb5_context context, HDB *db, krb5_data *key)
 169 {
 170     const HDB_Ext_Aliases *aliases;
 171     krb5_error_code code;
 172     hdb_entry oldentry;
 173     krb5_data value;
 174     size_t i;
 175
 176     code = db->hdb__get(context, db, *key, &value);
 177     if (code == HDB_ERR_NOENTRY)
 178         return 0;
 179     else if (code)
 180         return code;
 181
 182     code = hdb_value2entry(context, &value, &oldentry);
 183     krb5_data_free(&value);
 184     if (code)
 185         return code;
 186
 187     code = hdb_entry_get_aliases(&oldentry, &aliases);
 188     if (code || aliases == NULL) {
 189         free_hdb_entry(&oldentry);
 190         return code;
 191     }
 192     for (i = 0; i < aliases->aliases.len; i++) {
 193         krb5_data akey;
 194
 195         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 196         code = db->hdb__del(context, db, akey);
 197         krb5_data_free(&akey);
 198         if (code) {
 199             free_hdb_entry(&oldentry);
 200             return code;
 201         }
 202     }
 203     free_hdb_entry(&oldentry);
 204     return 0;
 205 }
 206
 207 static krb5_error_code
 208 hdb_add_aliases(krb5_context context, HDB *db,
 209                 unsigned flags, hdb_entry_ex *entry)
 210 {
 211     const HDB_Ext_Aliases *aliases;
 212     krb5_error_code code;
 213     krb5_data key, value;
 214     size_t i;
 215
 216     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 217     if (code || aliases == NULL)
 218         return code;
 219
 220     for (i = 0; i < aliases->aliases.len; i++) {
 221         hdb_entry_alias entryalias;
 222         entryalias.principal = entry->entry.principal;
 223
 224         hdb_principal2key(context, &aliases->aliases.val[i], &key);
 225         code = hdb_entry_alias2value(context, &entryalias, &value);
 226         if (code) {
 227             krb5_data_free(&key);
 228             return code;
 229         }
 230         code = db->hdb__put(context, db, flags, key, value);
 231         krb5_data_free(&key);
 232         krb5_data_free(&value);
 233         if (code)
 234             return code;
 235     }
 236     return 0;
 237 }
 238
 239 static krb5_error_code
 240 hdb_check_aliases(krb5_context context, HDB *db, hdb_entry_ex *entry)
 241 {
 242     const HDB_Ext_Aliases *aliases;
 243     int code;
 244     size_t i;
 245
 246     /* check if new aliases already is used */
 247
 248     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 249     if (code)
 250         return code;
 251
 252     for (i = 0; aliases && i < aliases->aliases.len; i++) {
 253         hdb_entry_alias alias;
 254         krb5_data akey, value;
 255
 256         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 257         code = db->hdb__get(context, db, akey, &value);
 258         krb5_data_free(&akey);
 259         if (code == HDB_ERR_NOENTRY)
 260             continue;
 261         else if (code)
 262             return code;
 263
 264         code = hdb_value2entry_alias(context, &value, &alias);
 265         krb5_data_free(&value);
 266
 267         if (code == ASN1_BAD_ID)
 268             return HDB_ERR_EXISTS;
 269         else if (code)
 270             return code;
 271
 272         code = krb5_principal_compare(context, alias.principal,
 273                                       entry->entry.principal);
 274         free_hdb_entry_alias(&alias);
 275         if (code == 0)
 276             return HDB_ERR_EXISTS;
 277     }
 278     return 0;
 279 }
 280
 281 krb5_error_code
 282 _hdb_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 283 {
 284     krb5_data key, value;
 285     int code;
 286
 287     /* check if new aliases already is used */
 288     code = hdb_check_aliases(context, db, entry);
 289     if (code)
 290         return code;
 291
 292     if(entry->entry.generation == NULL) {
 293         struct timeval t;
 294         entry->entry.generation = malloc(sizeof(*entry->entry.generation));
 295         if(entry->entry.generation == NULL) {
 296             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 297             return ENOMEM;
 298         }
 299         gettimeofday(&t, NULL);
 300         entry->entry.generation->time = t.tv_sec;
 301         entry->entry.generation->usec = t.tv_usec;
 302         entry->entry.generation->gen = 0;
 303     } else
 304         entry->entry.generation->gen++;
 305
 306     code = hdb_seal_keys(context, db, &entry->entry);
 307     if (code)
 308         return code;
 309
 310     hdb_principal2key(context, entry->entry.principal, &key);
 311
 312     /* remove aliases */
 313     code = hdb_remove_aliases(context, db, &key);
 314     if (code) {
 315         krb5_data_free(&key);
 316         return code;
 317     }
 318     hdb_entry2value(context, &entry->entry, &value);
 319     code = db->hdb__put(context, db, flags & HDB_F_REPLACE, key, value);
 320     krb5_data_free(&value);
 321     krb5_data_free(&key);
 322     if (code)
 323         return code;
 324
 325     code = hdb_add_aliases(context, db, flags, entry);
 326
 327     return code;
 328 }
 329
 330 krb5_error_code
 331 _hdb_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 332 {
 333     krb5_data key;
 334     int code;
 335
 336     hdb_principal2key(context, principal, &key);
 337
 338     code = hdb_remove_aliases(context, db, &key);
 339     if (code) {
 340         krb5_data_free(&key);
 341         return code;
 342     }
 343     code = db->hdb__del(context, db, key);
 344     krb5_data_free(&key);
 345     return code;
 346 }
 347