lib/hdb/db3.c

   1 /*
   2  * Copyright (c) 1997 - 2006 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_ex *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     memset(entry, 0, sizeof(*entry));
 117     if (hdb_value2entry(context, &data, &entry->entry))
 118         return DB_seq(context, db, flags, entry, DB_NEXT);
 119     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 120         code = hdb_unseal_keys (context, db, &entry->entry);
 121         if (code)
 122             hdb_free_entry (context, entry);
 123     }
 124     if (entry->entry.principal == NULL) {
 125         entry->entry.principal = malloc(sizeof(*entry->entry.principal));
 126         if (entry->entry.principal == NULL) {
 127             hdb_free_entry (context, entry);
 128             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 129             return ENOMEM;
 130         } else {
 131             hdb_key2principal(context, &key_data, entry->entry.principal);
 132         }
 133     }
 134     return 0;
 135 }
 136
 137
 138 static krb5_error_code
 139 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 140 {
 141     return DB_seq(context, db, flags, entry, DB_FIRST);
 142 }
 143
 144
 145 static krb5_error_code
 146 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 147 {
 148     return DB_seq(context, db, flags, entry, DB_NEXT);
 149 }
 150
 151 static krb5_error_code
 152 DB_rename(krb5_context context, HDB *db, const char *new_name)
 153 {
 154     int ret;
 155     char *old, *new;
 156
 157     asprintf(&old, "%s.db", db->hdb_name);
 158     asprintf(&new, "%s.db", new_name);
 159     ret = rename(old, new);
 160     free(old);
 161     free(new);
 162     if(ret)
 163         return errno;
 164
 165     free(db->hdb_name);
 166     db->hdb_name = strdup(new_name);
 167     return 0;
 168 }
 169
 170 static krb5_error_code
 171 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 172 {
 173     DB *d = (DB*)db->hdb_db;
 174     DBT k, v;
 175     int code;
 176
 177     memset(&k, 0, sizeof(DBT));
 178     memset(&v, 0, sizeof(DBT));
 179     k.data = key.data;
 180     k.size = key.length;
 181     k.flags = 0;
 182     if ((code = (*db->hdb_lock)(context, db, HDB_RLOCK)))
 183         return code;
 184     code = (*d->get)(d, NULL, &k, &v, 0);
 185     (*db->hdb_unlock)(context, db);
 186     if(code == DB_NOTFOUND)
 187         return HDB_ERR_NOENTRY;
 188     if(code)
 189         return code;
 190
 191     krb5_data_copy(reply, v.data, v.size);
 192     return 0;
 193 }
 194
 195 static krb5_error_code
 196 DB__put(krb5_context context, HDB *db, int replace,
 197         krb5_data key, krb5_data value)
 198 {
 199     DB *d = (DB*)db->hdb_db;
 200     DBT k, v;
 201     int code;
 202
 203     memset(&k, 0, sizeof(DBT));
 204     memset(&v, 0, sizeof(DBT));
 205     k.data = key.data;
 206     k.size = key.length;
 207     k.flags = 0;
 208     v.data = value.data;
 209     v.size = value.length;
 210     v.flags = 0;
 211     if ((code = (*db->hdb_lock)(context, db, HDB_WLOCK)))
 212         return code;
 213     code = (*d->put)(d, NULL, &k, &v, replace ? 0 : DB_NOOVERWRITE);
 214     (*db->hdb_unlock)(context, db);
 215     if(code == DB_KEYEXIST)
 216         return HDB_ERR_EXISTS;
 217     if(code)
 218         return errno;
 219     return 0;
 220 }
 221
 222 static krb5_error_code
 223 DB__del(krb5_context context, HDB *db, krb5_data key)
 224 {
 225     DB *d = (DB*)db->hdb_db;
 226     DBT k;
 227     krb5_error_code code;
 228     memset(&k, 0, sizeof(DBT));
 229     k.data = key.data;
 230     k.size = key.length;
 231     k.flags = 0;
 232     code = (*db->hdb_lock)(context, db, HDB_WLOCK);
 233     if(code)
 234         return code;
 235     code = (*d->del)(d, NULL, &k, 0);
 236     (*db->hdb_unlock)(context, db);
 237     if(code == DB_NOTFOUND)
 238         return HDB_ERR_NOENTRY;
 239     if(code)
 240         return code;
 241     return 0;
 242 }
 243
 244 static krb5_error_code
 245 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 246 {
 247     DBC *dbc = NULL;
 248     char *fn;
 249     krb5_error_code ret;
 250     DB *d;
 251     int myflags = 0;
 252
 253     if (flags & O_CREAT)
 254       myflags |= DB_CREATE;
 255
 256     if (flags & O_EXCL)
 257       myflags |= DB_EXCL;
 258
 259     if((flags & O_ACCMODE) == O_RDONLY)
 260       myflags |= DB_RDONLY;
 261
 262     if (flags & O_TRUNC)
 263       myflags |= DB_TRUNCATE;
 264
 265     asprintf(&fn, "%s.db", db->hdb_name);
 266     if (fn == NULL) {
 267         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 268         return ENOMEM;
 269     }
 270     db_create(&d, NULL, 0);
 271     db->hdb_db = d;
 272
 273 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 274     ret = (*d->open)(db->hdb_db, NULL, fn, NULL, DB_BTREE, myflags, mode);
 275 #else
 276     ret = (*d->open)(db->hdb_db, fn, NULL, DB_BTREE, myflags, mode);
 277 #endif
 278
 279     if (ret == ENOENT) {
 280         /* try to open without .db extension */
 281 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 282         ret = (*d->open)(db->hdb_db, NULL, db->hdb_name, NULL, DB_BTREE,
 283                          myflags, mode);
 284 #else
 285         ret = (*d->open)(db->hdb_db, db->hdb_name, NULL, DB_BTREE,
 286                          myflags, mode);
 287 #endif
 288     }
 289
 290     if (ret) {
 291         free(fn);
 292         krb5_set_error_message(context, ret, "opening %s: %s",
 293                               db->hdb_name, strerror(ret));
 294         return ret;
 295     }
 296     free(fn);
 297
 298     ret = (*d->cursor)(d, NULL, &dbc, 0);
 299     if (ret) {
 300         krb5_set_error_message(context, ret, "d->cursor: %s", strerror(ret));
 301         return ret;
 302     }
 303     db->hdb_dbc = dbc;
 304
 305     if((flags & O_ACCMODE) == O_RDONLY)
 306         ret = hdb_check_db_format(context, db);
 307     else
 308         ret = hdb_init_db(context, db);
 309     if(ret == HDB_ERR_NOENTRY)
 310         return 0;
 311     if (ret) {
 312         DB_close(context, db);
 313         krb5_set_error_message(context, ret, "hdb_open: failed %s database %s",
 314                                (flags & O_ACCMODE) == O_RDONLY ?
 315                                "checking format of" : "initialize",
 316                                db->hdb_name);
 317     }
 318
 319     return ret;
 320 }
 321
 322 krb5_error_code
 323 hdb_db_create(krb5_context context, HDB **db,
 324               const char *filename)
 325 {
 326     *db = calloc(1, sizeof(**db));
 327     if (*db == NULL) {
 328         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 329         return ENOMEM;
 330     }
 331
 332     (*db)->hdb_db = NULL;
 333     (*db)->hdb_name = strdup(filename);
 334     if ((*db)->hdb_name == NULL) {
 335         free(*db);
 336         *db = NULL;
 337         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 338         return ENOMEM;
 339     }
 340     (*db)->hdb_master_key_set = 0;
 341     (*db)->hdb_openp = 0;
 342     (*db)->hdb_capability_flags = 0;
 343     (*db)->hdb_open  = DB_open;
 344     (*db)->hdb_close = DB_close;
 345     (*db)->hdb_fetch = _hdb_fetch;
 346     (*db)->hdb_store = _hdb_store;
 347     (*db)->hdb_remove = _hdb_remove;
 348     (*db)->hdb_firstkey = DB_firstkey;
 349     (*db)->hdb_nextkey= DB_nextkey;
 350     (*db)->hdb_lock = DB_lock;
 351     (*db)->hdb_unlock = DB_unlock;
 352     (*db)->hdb_rename = DB_rename;
 353     (*db)->hdb__get = DB__get;
 354     (*db)->hdb__put = DB__put;
 355     (*db)->hdb__del = DB__del;
 356     (*db)->hdb_destroy = DB_destroy;
 357     return 0;
 358 }
 359 #endif /* HAVE_DB3 */