lib/hdb/db3.c

   1 /*
   2  * Copyright (c) 1997 - 2005 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 #if HAVE_DB3
  39
  40 #ifdef HAVE_DB4_DB_H
  41 #include <db4/db.h>
  42 #elif defined(HAVE_DB3_DB_H)
  43 #include <db3/db.h>
  44 #else
  45 #include <db.h>
  46 #endif
  47
  48 static krb5_error_code
  49 DB_close(krb5_context context, HDB *db)
  50 {
  51     DB *d = (DB*)db->hdb_db;
  52     DBC *dbcp = (DBC*)db->hdb_dbc;
  53
  54     dbcp->c_close(dbcp);
  55     db->hdb_dbc = 0;
  56     d->close(d, 0);
  57     return 0;
  58 }
  59
  60 static krb5_error_code
  61 DB_destroy(krb5_context context, HDB *db)
  62 {
  63     krb5_error_code ret;
  64
  65     ret = hdb_clear_master_key (context, db);
  66     free(db->hdb_name);
  67     free(db);
  68     return ret;
  69 }
  70
  71 static krb5_error_code
  72 DB_lock(krb5_context context, HDB *db, int operation)
  73 {
  74     DB *d = (DB*)db->hdb_db;
  75     int fd;
  76     if ((*d->fd)(d, &fd))
  77         return HDB_ERR_CANT_LOCK_DB;
  78     return hdb_lock(fd, operation);
  79 }
  80
  81 static krb5_error_code
  82 DB_unlock(krb5_context context, HDB *db)
  83 {
  84     DB *d = (DB*)db->hdb_db;
  85     int fd;
  86     if ((*d->fd)(d, &fd))
  87         return HDB_ERR_CANT_LOCK_DB;
  88     return hdb_unlock(fd);
  89 }
  90
  91
  92 static krb5_error_code
  93 DB_seq(krb5_context context, HDB *db,
  94        unsigned flags, hdb_entry *entry, int flag)
  95 {
  96     DBT key, value;
  97     DBC *dbcp = db->hdb_dbc;
  98     krb5_data key_data, data;
  99     int code;
 100
 101     memset(&key, 0, sizeof(DBT));
 102     memset(&value, 0, sizeof(DBT));
 103     if (db->hdb_lock(context, db, HDB_RLOCK))
 104         return HDB_ERR_DB_INUSE;
 105     code = dbcp->c_get(dbcp, &key, &value, flag);
 106     db->hdb_unlock(context, db); /* XXX check value */
 107     if (code == DB_NOTFOUND)
 108         return HDB_ERR_NOENTRY;
 109     if (code)
 110         return code;
 111
 112     key_data.data = key.data;
 113     key_data.length = key.size;
 114     data.data = value.data;
 115     data.length = value.size;
 116     if (hdb_value2entry(context, &data, entry))
 117         return DB_seq(context, db, flags, entry, DB_NEXT);
 118     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 119         code = hdb_unseal_keys (context, db, entry);
 120         if (code)
 121             hdb_free_entry (context, entry);
 122     }
 123     if (entry->principal == NULL) {
 124         entry->principal = malloc(sizeof(*entry->principal));
 125         if (entry->principal == NULL) {
 126             hdb_free_entry (context, entry);
 127             krb5_set_error_string(context, "malloc: out of memory");
 128             return ENOMEM;
 129         } else {
 130             hdb_key2principal(context, &key_data, entry->principal);
 131         }
 132     }
 133     return 0;
 134 }
 135
 136
 137 static krb5_error_code
 138 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 139 {
 140     return DB_seq(context, db, flags, entry, DB_FIRST);
 141 }
 142
 143
 144 static krb5_error_code
 145 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
 146 {
 147     return DB_seq(context, db, flags, entry, DB_NEXT);
 148 }
 149
 150 static krb5_error_code
 151 DB_rename(krb5_context context, HDB *db, const char *new_name)
 152 {
 153     int ret;
 154     char *old, *new;
 155
 156     asprintf(&old, "%s.db", db->hdb_name);
 157     asprintf(&new, "%s.db", new_name);
 158     ret = rename(old, new);
 159     free(old);
 160     free(new);
 161     if(ret)
 162         return errno;
 163
 164     free(db->hdb_name);
 165     db->hdb_name = strdup(new_name);
 166     return 0;
 167 }
 168
 169 static krb5_error_code
 170 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 171 {
 172     DB *d = (DB*)db->hdb_db;
 173     DBT k, v;
 174     int code;
 175
 176     memset(&k, 0, sizeof(DBT));
 177     memset(&v, 0, sizeof(DBT));
 178     k.data = key.data;
 179     k.size = key.length;
 180     k.flags = 0;
 181     if ((code = db->hdb_lock(context, db, HDB_RLOCK)))
 182         return code;
 183     code = d->get(d, NULL, &k, &v, 0);
 184     db->hdb_unlock(context, db);
 185     if(code == DB_NOTFOUND)
 186         return HDB_ERR_NOENTRY;
 187     if(code)
 188         return code;
 189
 190     krb5_data_copy(reply, v.data, v.size);
 191     return 0;
 192 }
 193
 194 static krb5_error_code
 195 DB__put(krb5_context context, HDB *db, int replace,
 196         krb5_data key, krb5_data value)
 197 {
 198     DB *d = (DB*)db->hdb_db;
 199     DBT k, v;
 200     int code;
 201
 202     memset(&k, 0, sizeof(DBT));
 203     memset(&v, 0, sizeof(DBT));
 204     k.data = key.data;
 205     k.size = key.length;
 206     k.flags = 0;
 207     v.data = value.data;
 208     v.size = value.length;
 209     v.flags = 0;
 210     if ((code = db->hdb_lock(context, db, HDB_WLOCK)))
 211         return code;
 212     code = d->put(d, NULL, &k, &v, replace ? 0 : DB_NOOVERWRITE);
 213     db->hdb_unlock(context, db);
 214     if(code == DB_KEYEXIST)
 215         return HDB_ERR_EXISTS;
 216     if(code)
 217         return errno;
 218     return 0;
 219 }
 220
 221 static krb5_error_code
 222 DB__del(krb5_context context, HDB *db, krb5_data key)
 223 {
 224     DB *d = (DB*)db->hdb_db;
 225     DBT k;
 226     krb5_error_code code;
 227     memset(&k, 0, sizeof(DBT));
 228     k.data = key.data;
 229     k.size = key.length;
 230     k.flags = 0;
 231     code = db->hdb_lock(context, db, HDB_WLOCK);
 232     if(code)
 233         return code;
 234     code = d->del(d, NULL, &k, 0);
 235     db->hdb_unlock(context, db);
 236     if(code == DB_NOTFOUND)
 237         return HDB_ERR_NOENTRY;
 238     if(code)
 239         return code;
 240     return 0;
 241 }
 242
 243 static krb5_error_code
 244 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 245 {
 246     char *fn;
 247     krb5_error_code ret;
 248     DB *d;
 249     int myflags = 0;
 250
 251     if (flags & O_CREAT)
 252       myflags |= DB_CREATE;
 253
 254     if (flags & O_EXCL)
 255       myflags |= DB_EXCL;
 256
 257     if((flags & O_ACCMODE) == O_RDONLY)
 258       myflags |= DB_RDONLY;
 259
 260     if (flags & O_TRUNC)
 261       myflags |= DB_TRUNCATE;
 262
 263     asprintf(&fn, "%s.db", db->hdb_name);
 264     if (fn == NULL) {
 265         krb5_set_error_string(context, "malloc: out of memory");
 266         return ENOMEM;
 267     }
 268     db_create(&d, NULL, 0);
 269     db->hdb_db = d;
 270
 271 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 272     ret = d->open(db->hdb_db, NULL, fn, NULL, DB_BTREE, myflags, mode);
 273 #else
 274     ret = d->open(db->hdb_db, fn, NULL, DB_BTREE, myflags, mode);
 275 #endif
 276
 277     if (ret == ENOENT) {
 278         /* try to open without .db extension */
 279 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 280         ret = d->open(db->hdb_db, NULL, db->hdb_name, NULL, DB_BTREE, myflags, mode);
 281 #else
 282         ret = d->open(db->hdb_db, db->hdb_name, NULL, DB_BTREE, myflags, mode);
 283 #endif
 284     }
 285
 286     if (ret) {
 287         free(fn);
 288         krb5_set_error_string(context, "opening %s: %s",
 289                               db->hdb_name, strerror(ret));
 290         return ret;
 291     }
 292     free(fn);
 293
 294     ret = d->cursor(d, NULL, (DBC **)&db->hdb_dbc, 0);
 295     if (ret) {
 296         krb5_set_error_string(context, "d->cursor: %s", strerror(ret));
 297         return ret;
 298     }
 299
 300     if((flags & O_ACCMODE) == O_RDONLY)
 301         ret = hdb_check_db_format(context, db);
 302     else
 303         ret = hdb_init_db(context, db);
 304     if(ret == HDB_ERR_NOENTRY)
 305         return 0;
 306     if (ret) {
 307         DB_close(context, db);
 308         krb5_set_error_string(context, "hdb_open: failed %s database %s",
 309                               (flags & O_ACCMODE) == O_RDONLY ?
 310                               "checking format of" : "initialize",
 311                               db->hdb_name);
 312     }
 313
 314     return ret;
 315 }
 316
 317 krb5_error_code
 318 hdb_db_create(krb5_context context, HDB **db,
 319               const char *filename)
 320 {
 321     *db = malloc(sizeof(**db));
 322     if (*db == NULL) {
 323         krb5_set_error_string(context, "malloc: out of memory");
 324         return ENOMEM;
 325     }
 326
 327     (*db)->hdb_db = NULL;
 328     (*db)->hdb_name = strdup(filename);
 329     if ((*db)->hdb_name == NULL) {
 330         krb5_set_error_string(context, "malloc: out of memory");
 331         free(*db);
 332         *db = NULL;
 333         return ENOMEM;
 334     }
 335     (*db)->hdb_master_key_set = 0;
 336     (*db)->hdb_openp = 0;
 337     (*db)->hdb_open  = DB_open;
 338     (*db)->hdb_close = DB_close;
 339     (*db)->hdb_fetch = _hdb_fetch;
 340     (*db)->hdb_store = _hdb_store;
 341     (*db)->hdb_remove = _hdb_remove;
 342     (*db)->hdb_firstkey = DB_firstkey;
 343     (*db)->hdb_nextkey= DB_nextkey;
 344     (*db)->hdb_lock = DB_lock;
 345     (*db)->hdb_unlock = DB_unlock;
 346     (*db)->hdb_rename = DB_rename;
 347     (*db)->hdb__get = DB__get;
 348     (*db)->hdb__put = DB__put;
 349     (*db)->hdb__del = DB__del;
 350     (*db)->hdb_destroy = DB_destroy;
 351     return 0;
 352 }
 353 #endif /* HAVE_DB3 */