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 RCSID("$Id$");
  37
  38 int
  39 hdb_principal2key(krb5_context context, krb5_const_principal p, krb5_data *key)
  40 {
  41     Principal new;
  42     size_t len;
  43     int ret;
  44
  45     ret = copy_Principal(p, &new);
  46     if(ret)
  47         return ret;
  48     new.name.name_type = 0;
  49
  50     ASN1_MALLOC_ENCODE(Principal, key->data, key->length, &new, &len, ret);
  51     if (ret == 0 && key->length != len)
  52         krb5_abortx(context, "internal asn.1 encoder error");
  53     free_Principal(&new);
  54     return ret;
  55 }
  56
  57 int
  58 hdb_key2principal(krb5_context context, krb5_data *key, krb5_principal p)
  59 {
  60     return decode_Principal(key->data, key->length, p, NULL);
  61 }
  62
  63 int
  64 hdb_entry2value(krb5_context context, const hdb_entry *ent, krb5_data *value)
  65 {
  66     size_t len;
  67     int ret;
  68
  69     ASN1_MALLOC_ENCODE(hdb_entry, value->data, value->length, ent, &len, ret);
  70     if (ret == 0 && value->length != len)
  71         krb5_abortx(context, "internal asn.1 encoder error");
  72     return ret;
  73 }
  74
  75 int
  76 hdb_value2entry(krb5_context context, krb5_data *value, hdb_entry *ent)
  77 {
  78     return decode_hdb_entry(value->data, value->length, ent, NULL);
  79 }
  80
  81 int
  82 hdb_entry_alias2value(krb5_context context,
  83                       const hdb_entry_alias *alias,
  84                       krb5_data *value)
  85 {
  86     size_t len;
  87     int ret;
  88
  89     ASN1_MALLOC_ENCODE(hdb_entry_alias, value->data, value->length,
  90                        alias, &len, ret);
  91     if (ret == 0 && value->length != len)
  92         krb5_abortx(context, "internal asn.1 encoder error");
  93     return ret;
  94 }
  95
  96 int
  97 hdb_value2entry_alias(krb5_context context, krb5_data *value,
  98                       hdb_entry_alias *ent)
  99 {
 100     return decode_hdb_entry_alias(value->data, value->length, ent, NULL);
 101 }
 102
 103 krb5_error_code
 104 _hdb_fetch(krb5_context context, HDB *db, krb5_const_principal principal,
 105            unsigned flags, hdb_entry_ex *entry)
 106 {
 107     krb5_data key, value;
 108     int code;
 109
 110     hdb_principal2key(context, principal, &key);
 111     code = db->hdb__get(context, db, key, &value);
 112     krb5_data_free(&key);
 113     if(code)
 114         return code;
 115     code = hdb_value2entry(context, &value, &entry->entry);
 116     if (code == ASN1_BAD_ID && (flags & HDB_F_CANON) == 0) {
 117         krb5_data_free(&value);
 118         return HDB_ERR_NOENTRY;
 119     } else if (code == ASN1_BAD_ID) {
 120         hdb_entry_alias alias;
 121
 122         code = hdb_value2entry_alias(context, &value, &alias);
 123         if (code) {
 124             krb5_data_free(&value);
 125             return code;
 126         }
 127         hdb_principal2key(context, alias.principal, &key);
 128         krb5_data_free(&value);
 129         free_hdb_entry_alias(&alias);
 130
 131         code = db->hdb__get(context, db, key, &value);
 132         krb5_data_free(&key);
 133         if (code)
 134             return code;
 135         code = hdb_value2entry(context, &value, &entry->entry);
 136         if (code) {
 137             krb5_data_free(&value);
 138             return code;
 139         }
 140     }
 141     krb5_data_free(&value);
 142     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 143         code = hdb_unseal_keys (context, db, &entry->entry);
 144         if (code)
 145             hdb_free_entry(context, entry);
 146     }
 147     return code;
 148 }
 149
 150 static krb5_error_code
 151 hdb_remove_aliases(krb5_context context, HDB *db, krb5_data *key)
 152 {
 153     const HDB_Ext_Aliases *aliases;
 154     krb5_error_code code;
 155     hdb_entry oldentry;
 156     krb5_data value;
 157     int i;
 158
 159     code = db->hdb__get(context, db, *key, &value);
 160     if (code == HDB_ERR_NOENTRY)
 161         return 0;
 162     else if (code)
 163         return code;
 164
 165     code = hdb_value2entry(context, &value, &oldentry);
 166     krb5_data_free(&value);
 167     if (code)
 168         return code;
 169
 170     code = hdb_entry_get_aliases(&oldentry, &aliases);
 171     if (code || aliases == NULL) {
 172         free_hdb_entry(&oldentry);
 173         return code;
 174     }
 175     for (i = 0; i < aliases->aliases.len; i++) {
 176         krb5_data akey;
 177
 178         hdb_principal2key(context, &aliases->aliases.val[i], &akey);
 179         code = db->hdb__del(context, db, akey);
 180         krb5_data_free(&akey);
 181         if (code) {
 182             free_hdb_entry(&oldentry);
 183             return code;
 184         }
 185     }
 186     free_hdb_entry(&oldentry);
 187     return 0;
 188 }
 189
 190 static krb5_error_code
 191 hdb_add_aliases(krb5_context context, HDB *db,
 192                 unsigned flags, hdb_entry_ex *entry)
 193 {
 194     const HDB_Ext_Aliases *aliases;
 195     krb5_error_code code;
 196     krb5_data key, value;
 197     int i;
 198
 199     code = hdb_entry_get_aliases(&entry->entry, &aliases);
 200     if (code || aliases == NULL)
 201         return code;
 202
 203     for (i = 0; i < aliases->aliases.len; i++) {
 204         hdb_entry_alias entryalias;
 205         entryalias.principal = entry->entry.principal;
 206
 207         hdb_principal2key(context, &aliases->aliases.val[i], &key);
 208         code = hdb_entry_alias2value(context, &entryalias, &value);
 209         if (code) {
 210             krb5_data_free(&key);
 211             return code;
 212         }
 213         code = db->hdb__put(context, db, flags, key, value);
 214         krb5_data_free(&key);
 215         krb5_data_free(&value);
 216         if (code)
 217             return code;
 218     }
 219     return 0;
 220 }
 221
 222 krb5_error_code
 223 _hdb_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 224 {
 225     krb5_data key, value;
 226     int code;
 227
 228     if(entry->entry.generation == NULL) {
 229         struct timeval t;
 230         entry->entry.generation = malloc(sizeof(*entry->entry.generation));
 231         if(entry->entry.generation == NULL) {
 232             krb5_set_error_string(context, "malloc: out of memory");
 233             return ENOMEM;
 234         }
 235         gettimeofday(&t, NULL);
 236         entry->entry.generation->time = t.tv_sec;
 237         entry->entry.generation->usec = t.tv_usec;
 238         entry->entry.generation->gen = 0;
 239     } else
 240         entry->entry.generation->gen++;
 241     hdb_principal2key(context, entry->entry.principal, &key);
 242     code = hdb_seal_keys(context, db, &entry->entry);
 243     if (code) {
 244         krb5_data_free(&key);
 245         return code;
 246     }
 247
 248     /* remove aliases */
 249     code = hdb_remove_aliases(context, db, &key);
 250     if (code) {
 251         krb5_data_free(&key);
 252         return code;
 253     }
 254     hdb_entry2value(context, &entry->entry, &value);
 255     code = db->hdb__put(context, db, flags & HDB_F_REPLACE, key, value);
 256     krb5_data_free(&value);
 257     krb5_data_free(&key);
 258     if (code)
 259         return code;
 260
 261     code = hdb_add_aliases(context, db, flags, entry);
 262
 263     return code;
 264 }
 265
 266 krb5_error_code
 267 _hdb_remove(krb5_context context, HDB *db, krb5_const_principal principal)
 268 {
 269     krb5_data key;
 270     int code;
 271
 272     hdb_principal2key(context, principal, &key);
 273
 274     code = hdb_remove_aliases(context, db, &key);
 275     if (code) {
 276         krb5_data_free(&key);
 277         return code;
 278     }
 279     code = db->hdb__del(context, db, key);
 280     krb5_data_free(&key);
 281     return code;
 282 }
 283