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 ((flags & HDB_F_DECRYPT) && (flags & HDB_F_ALL_KVNOS)) {
 159         /* Decrypt the current keys */
 160         ret = hdb_unseal_keys(context, db, &entry->entry);
 161         if (ret) {
 162             hdb_free_entry(context, entry);
 163             return ret;
 164         }
 165         /* Decrypt the key history too */
 166         ret = hdb_unseal_keys_kvno(context, db, 0, flags, &entry->entry);
 167         if (ret) {
 168             hdb_free_entry(context, entry);
 169             return ret;
 170         }
 171     } else if ((flags & HDB_F_DECRYPT)) {
 172         if ((flags & HDB_F_KVNO_SPECIFIED) == 0 || kvno == entry->entry.kvno) {
 173             /* Decrypt the current keys */
 174             ret = hdb_unseal_keys(context, db, &entry->entry);
 175             if (ret) {
 176                 hdb_free_entry(context, entry);
 177                 return ret;
 178             }
 179         } else {
 180             if ((flags & HDB_F_ALL_KVNOS))
 181                 kvno = 0;
 182             /*
 183              * Find and decrypt the keys from the history that we want,
 184              * and swap them with the current keys
 185              */
 186             ret = hdb_unseal_keys_kvno(context, db, kvno, flags, &entry->entry);
 187             if (ret) {
 188                 hdb_free_entry(context, entry);
 189                 return ret;
 190             }
 191         }
 192     }
 193
 194     return 0;
 195 }
 196
 197 static krb5_error_code
 198 hdb_remove_aliases(krb5_context context, HDB *db, krb5_data *key)
 199 {
 200     const HDB_Ext_Aliases *aliases;
 201     krb5_error_code code;
 202     hdb_entry oldentry;
 203     krb5_data value;
 204     size_t i;
 205
 206     code = db->hdb__get(context, db, *key, &value);
 207     if (code == HDB_ERR_NOENTRY)
 208         return 0;
 209     else if (code)
 210         return code;
 211
 212     code = hdb_value2entry(context, &value, &oldentry);
 213     krb5_data_free(&value);
 214     if (code)
 215         return code;
 216
 217     code = hdb_entry_get_aliases(&oldentry, &aliases);
 218     if (code || aliases == NULL) {
 219         free_hdb_entry(&oldentry);
 220         return code;
 221     }
 222     for (i = 0; i < aliases->aliases.len; i++) {
 223         krb5_data akey;
 224
 225         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 226         code = db->hdb__del(context, db, akey);
 227         krb5_data_free(&akey);
 228         if (code) {
 229             free_hdb_entry(&oldentry);
 230             return code;
 231         }
 232     }
 233     free_hdb_entry(&oldentry);
 234     return 0;
 235 }
 236
 237 static krb5_error_code
 238 hdb_add_aliases(krb5_context context, HDB *db,
 239                 unsigned flags, hdb_entry_ex *entry)
 240 {
 241     const HDB_Ext_Aliases *aliases;
 242     krb5_error_code code;
 243     krb5_data key, value;
 244     size_t i;
 245
 246     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 247     if (code || aliases == NULL)
 248         return code;
 249
 250     for (i = 0; i < aliases->aliases.len; i++) {
 251         hdb_entry_alias entryalias;
 252         entryalias.principal = entry->entry.principal;
 253
 254         hdb_principal2key(context, &aliases->aliases.val[i], &key);
 255         code = hdb_entry_alias2value(context, &entryalias, &value);
 256         if (code) {
 257             krb5_data_free(&key);
 258             return code;
 259         }
 260         code = db->hdb__put(context, db, flags, key, value);
 261         krb5_data_free(&key);
 262         krb5_data_free(&value);
 263         if (code)
 264             return code;
 265     }
 266     return 0;
 267 }
 268
 269 static krb5_error_code
 270 hdb_check_aliases(krb5_context context, HDB *db, hdb_entry_ex *entry)
 271 {
 272     const HDB_Ext_Aliases *aliases;
 273     int code;
 274     size_t i;
 275
 276     /* check if new aliases already is used */
 277
 278     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 279     if (code)
 280         return code;
 281
 282     for (i = 0; aliases && i < aliases->aliases.len; i++) {
 283         hdb_entry_alias alias;
 284         krb5_data akey, value;
 285
 286         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 287         code = db->hdb__get(context, db, akey, &value);
 288         krb5_data_free(&akey);
 289         if (code == HDB_ERR_NOENTRY)
 290             continue;
 291         else if (code)
 292             return code;
 293
 294         code = hdb_value2entry_alias(context, &value, &alias);
 295         krb5_data_free(&value);
 296
 297         if (code == ASN1_BAD_ID)
 298             return HDB_ERR_EXISTS;
 299         else if (code)
 300             return code;
 301
 302         code = krb5_principal_compare(context, alias.principal,
 303                                       entry->entry.principal);
 304         free_hdb_entry_alias(&alias);
 305         if (code == 0)
 306             return HDB_ERR_EXISTS;
 307     }
 308     return 0;
 309 }
 310
 311 krb5_error_code
 312 _hdb_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 313 {
 314     krb5_data key, value;
 315     int code;
 316
 317     if (entry->entry.flags.do_not_store)
 318         return HDB_ERR_MISUSE;
 319     /* check if new aliases already is used */
 320     code = hdb_check_aliases(context, db, entry);
 321     if (code)
 322         return code;
 323
 324     if(entry->entry.generation == NULL) {
 325         struct timeval t;
 326         entry->entry.generation = malloc(sizeof(*entry->entry.generation));
 327         if(entry->entry.generation == NULL) {
 328             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 329             return ENOMEM;
 330         }
 331         gettimeofday(&t, NULL);
 332         entry->entry.generation->time = t.tv_sec;
 333         entry->entry.generation->usec = t.tv_usec;
 334         entry->entry.generation->gen = 0;
 335     } else
 336         entry->entry.generation->gen++;
 337
 338     code = hdb_seal_keys(context, db, &entry->entry);
 339     if (code)
 340         return code;
 341
 342     hdb_principal2key(context, entry->entry.principal, &key);
 343
 344     /* remove aliases */
 345     code = hdb_remove_aliases(context, db, &key);
 346     if (code) {
 347         krb5_data_free(&key);
 348         return code;
 349     }
 350     hdb_entry2value(context, &entry->entry, &value);
 351     code = db->hdb__put(context, db, flags & HDB_F_REPLACE, key, value);
 352     krb5_data_free(&value);
 353     krb5_data_free(&key);
 354     if (code)
 355         return code;
 356
 357     code = hdb_add_aliases(context, db, flags, entry);
 358
 359     return code;
 360 }
 361
 362 krb5_error_code
 363 _hdb_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 364 {
 365     krb5_data key;
 366     int code;
 367
 368     hdb_principal2key(context, principal, &key);
 369
 370     code = hdb_remove_aliases(context, db, &key);
 371     if (code) {
 372         krb5_data_free(&key);
 373         return code;
 374     }
 375     code = db->hdb__del(context, db, key);
 376     krb5_data_free(&key);
 377     return code;
 378 }
 379