crypto/heimdal-0.6.3/lib/hdb/db.c

   1 /*
   2  * Copyright (c) 1997 - 2001 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: db.c,v 1.30 2001/08/09 08:41:48 assar Exp $");
  37
  38 #if HAVE_DB1
  39
  40 #if defined(HAVE_DB_185_H)
  41 #include <db_185.h>
  42 #elif defined(HAVE_DB_H)
  43 #include <db.h>
  44 #endif
  45
  46 static krb5_error_code
  47 DB_close(krb5_context context, HDB *db)
  48 {
  49     DB *d = (DB*)db->db;
  50     d->close(d);
  51     return 0;
  52 }
  53
  54 static krb5_error_code
  55 DB_destroy(krb5_context context, HDB *db)
  56 {
  57     krb5_error_code ret;
  58
  59     ret = hdb_clear_master_key (context, db);
  60     free(db->name);
  61     free(db);
  62     return ret;
  63 }
  64
  65 static krb5_error_code
  66 DB_lock(krb5_context context, HDB *db, int operation)
  67 {
  68     DB *d = (DB*)db->db;
  69     int fd = (*d->fd)(d);
  70     if(fd < 0)
  71         return HDB_ERR_CANT_LOCK_DB;
  72     return hdb_lock(fd, operation);
  73 }
  74
  75 static krb5_error_code
  76 DB_unlock(krb5_context context, HDB *db)
  77 {
  78     DB *d = (DB*)db->db;
  79     int fd = (*d->fd)(d);
  80     if(fd < 0)
  81         return HDB_ERR_CANT_LOCK_DB;
  82     return hdb_unlock(fd);
  83 }
  84
  85
  86 static krb5_error_code
  87 DB_seq(krb5_context context, HDB *db,
  88        unsigned flags, hdb_entry *entry, int flag)
  89 {
  90     DB *d = (DB*)db->db;
  91     DBT key, value;
  92     krb5_data key_data, data;
  93     int code;
  94
  95     code = db->lock(context, db, HDB_RLOCK);
  96     if(code == -1)
  97         return HDB_ERR_DB_INUSE;
  98     code = d->seq(d, &key, &value, flag);
  99     db->unlock(context, db); /* XXX check value */
 100     if(code == -1)
 101         return errno;
 102     if(code == 1)
 103         return HDB_ERR_NOENTRY;
 104
 105     key_data.data = key.data;
 106     key_data.length = key.size;
 107     data.data = value.data;
 108     data.length = value.size;
 109     if (hdb_value2entry(context, &data, entry))
 110         return DB_seq(context, db, flags, entry, R_NEXT);
 111     if (db->master_key_set && (flags & HDB_F_DECRYPT)) {
 112         code = hdb_unseal_keys (context, db, entry);
 113         if (code)
 114             hdb_free_entry (context, entry);
 115     }
 116     if (code == 0 && entry->principal == NULL) {
 117         entry->principal = malloc(sizeof(*entry->principal));
 118         if (entry->principal == NULL) {
 119             krb5_set_error_string(context, "malloc: out of memory");
 120             code = ENOMEM;
 121             hdb_free_entry (context, entry);
 122         } else {
 123             hdb_key2principal(context, &key_data, entry->principal);
 124         }
 125     }
 126     return code;
 127 }
 128
 129
 130 static krb5_error_code
 131 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 132 {
 133     return DB_seq(context, db, flags, entry, R_FIRST);
 134 }
 135
 136
 137 static krb5_error_code
 138 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 139 {
 140     return DB_seq(context, db, flags, entry, R_NEXT);
 141 }
 142
 143 static krb5_error_code
 144 DB_rename(krb5_context context, HDB *db, const char *new_name)
 145 {
 146     int ret;
 147     char *old, *new;
 148
 149     asprintf(&old, "%s.db", db->name);
 150     asprintf(&new, "%s.db", new_name);
 151     ret = rename(old, new);
 152     free(old);
 153     free(new);
 154     if(ret)
 155         return errno;
 156
 157     free(db->name);
 158     db->name = strdup(new_name);
 159     return 0;
 160 }
 161
 162 static krb5_error_code
 163 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 164 {
 165     DB *d = (DB*)db->db;
 166     DBT k, v;
 167     int code;
 168
 169     k.data = key.data;
 170     k.size = key.length;
 171     code = db->lock(context, db, HDB_RLOCK);
 172     if(code)
 173         return code;
 174     code = d->get(d, &k, &v, 0);
 175     db->unlock(context, db);
 176     if(code < 0)
 177         return errno;
 178     if(code == 1)
 179         return HDB_ERR_NOENTRY;
 180
 181     krb5_data_copy(reply, v.data, v.size);
 182     return 0;
 183 }
 184
 185 static krb5_error_code
 186 DB__put(krb5_context context, HDB *db, int replace,
 187         krb5_data key, krb5_data value)
 188 {
 189     DB *d = (DB*)db->db;
 190     DBT k, v;
 191     int code;
 192
 193     k.data = key.data;
 194     k.size = key.length;
 195     v.data = value.data;
 196     v.size = value.length;
 197     code = db->lock(context, db, HDB_WLOCK);
 198     if(code)
 199         return code;
 200     code = d->put(d, &k, &v, replace ? 0 : R_NOOVERWRITE);
 201     db->unlock(context, db);
 202     if(code < 0)
 203         return errno;
 204     if(code == 1)
 205         return HDB_ERR_EXISTS;
 206     return 0;
 207 }
 208
 209 static krb5_error_code
 210 DB__del(krb5_context context, HDB *db, krb5_data key)
 211 {
 212     DB *d = (DB*)db->db;
 213     DBT k;
 214     krb5_error_code code;
 215     k.data = key.data;
 216     k.size = key.length;
 217     code = db->lock(context, db, HDB_WLOCK);
 218     if(code)
 219         return code;
 220     code = d->del(d, &k, 0);
 221     db->unlock(context, db);
 222     if(code == 1)
 223         return HDB_ERR_NOENTRY;
 224     if(code < 0)
 225         return errno;
 226     return 0;
 227 }
 228
 229 static krb5_error_code
 230 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 231 {
 232     char *fn;
 233     krb5_error_code ret;
 234
 235     asprintf(&fn, "%s.db", db->name);
 236     if (fn == NULL) {
 237         krb5_set_error_string(context, "malloc: out of memory");
 238         return ENOMEM;
 239     }
 240     db->db = dbopen(fn, flags, mode, DB_BTREE, NULL);
 241     free(fn);
 242     /* try to open without .db extension */
 243     if(db->db == NULL && errno == ENOENT)
 244         db->db = dbopen(db->name, flags, mode, DB_BTREE, NULL);
 245     if(db->db == NULL) {
 246         ret = errno;
 247         krb5_set_error_string(context, "dbopen (%s): %s",
 248                               db->name, strerror(ret));
 249         return ret;
 250     }
 251     if((flags & O_ACCMODE) == O_RDONLY)
 252         ret = hdb_check_db_format(context, db);
 253     else
 254         ret = hdb_init_db(context, db);
 255     if(ret == HDB_ERR_NOENTRY) {
 256         krb5_clear_error_string(context);
 257         return 0;
 258     }
 259     return ret;
 260 }
 261
 262 krb5_error_code
 263 hdb_db_create(krb5_context context, HDB **db,
 264               const char *filename)
 265 {
 266     *db = malloc(sizeof(**db));
 267     if (*db == NULL) {
 268         krb5_set_error_string(context, "malloc: out of memory");
 269         return ENOMEM;
 270     }
 271
 272     (*db)->db = NULL;
 273     (*db)->name = strdup(filename);
 274     if ((*db)->name == NULL) {
 275         krb5_set_error_string(context, "malloc: out of memory");
 276         free(*db);
 277         *db = NULL;
 278         return ENOMEM;
 279     }
 280     (*db)->master_key_set = 0;
 281     (*db)->openp = 0;
 282     (*db)->open  = DB_open;
 283     (*db)->close = DB_close;
 284     (*db)->fetch = _hdb_fetch;
 285     (*db)->store = _hdb_store;
 286     (*db)->remove = _hdb_remove;
 287     (*db)->firstkey = DB_firstkey;
 288     (*db)->nextkey= DB_nextkey;
 289     (*db)->lock = DB_lock;
 290     (*db)->unlock = DB_unlock;
 291     (*db)->rename = DB_rename;
 292     (*db)->_get = DB__get;
 293     (*db)->_put = DB__put;
 294     (*db)->_del = DB__del;
 295     (*db)->destroy = DB_destroy;
 296     return 0;
 297 }
 298
 299 #endif /* HAVE_DB1 */