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 #if HAVE_DB3
  37
  38 #ifdef HAVE_DBHEADER
  39 #include <db.h>
  40 #elif HAVE_DB5_DB_H
  41 #include <db5/db.h>
  42 #elif HAVE_DB4_DB_H
  43 #include <db4/db.h>
  44 #elif HAVE_DB3_DB_H
  45 #include <db3/db.h>
  46 #else
  47 #include <db.h>
  48 #endif
  49
  50 static krb5_error_code
  51 DB_close(krb5_context context, HDB *db)
  52 {
  53     DB *d = (DB*)db->hdb_db;
  54     DBC *dbcp = (DBC*)db->hdb_dbc;
  55
  56     (*dbcp->c_close)(dbcp);
  57     db->hdb_dbc = 0;
  58     (*d->close)(d, 0);
  59     return 0;
  60 }
  61
  62 static krb5_error_code
  63 DB_destroy(krb5_context context, HDB *db)
  64 {
  65     krb5_error_code ret;
  66
  67     ret = hdb_clear_master_key (context, db);
  68     free(db->hdb_name);
  69     free(db);
  70     return ret;
  71 }
  72
  73 static krb5_error_code
  74 DB_lock(krb5_context context, HDB *db, int operation)
  75 {
  76     DB *d = (DB*)db->hdb_db;
  77     int fd;
  78     if ((*d->fd)(d, &fd))
  79         return HDB_ERR_CANT_LOCK_DB;
  80     return hdb_lock(fd, operation);
  81 }
  82
  83 static krb5_error_code
  84 DB_unlock(krb5_context context, HDB *db)
  85 {
  86     DB *d = (DB*)db->hdb_db;
  87     int fd;
  88     if ((*d->fd)(d, &fd))
  89         return HDB_ERR_CANT_LOCK_DB;
  90     return hdb_unlock(fd);
  91 }
  92
  93
  94 static krb5_error_code
  95 DB_seq(krb5_context context, HDB *db,
  96        unsigned flags, hdb_entry_ex *entry, int flag)
  97 {
  98     DBT key, value;
  99     DBC *dbcp = db->hdb_dbc;
 100     krb5_data key_data, data;
 101     int code;
 102
 103     memset(&key, 0, sizeof(DBT));
 104     memset(&value, 0, sizeof(DBT));
 105     if ((*db->hdb_lock)(context, db, HDB_RLOCK))
 106         return HDB_ERR_DB_INUSE;
 107     code = (*dbcp->c_get)(dbcp, &key, &value, flag);
 108     (*db->hdb_unlock)(context, db); /* XXX check value */
 109     if (code == DB_NOTFOUND)
 110         return HDB_ERR_NOENTRY;
 111     if (code)
 112         return code;
 113
 114     key_data.data = key.data;
 115     key_data.length = key.size;
 116     data.data = value.data;
 117     data.length = value.size;
 118     memset(entry, 0, sizeof(*entry));
 119     if (hdb_value2entry(context, &data, &entry->entry))
 120         return DB_seq(context, db, flags, entry, DB_NEXT);
 121     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 122         code = hdb_unseal_keys (context, db, &entry->entry);
 123         if (code)
 124             hdb_free_entry (context, entry);
 125     }
 126     if (entry->entry.principal == NULL) {
 127         entry->entry.principal = malloc(sizeof(*entry->entry.principal));
 128         if (entry->entry.principal == NULL) {
 129             hdb_free_entry (context, entry);
 130             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 131             return ENOMEM;
 132         } else {
 133             hdb_key2principal(context, &key_data, entry->entry.principal);
 134         }
 135     }
 136     return 0;
 137 }
 138
 139
 140 static krb5_error_code
 141 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 142 {
 143     return DB_seq(context, db, flags, entry, DB_FIRST);
 144 }
 145
 146
 147 static krb5_error_code
 148 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 149 {
 150     return DB_seq(context, db, flags, entry, DB_NEXT);
 151 }
 152
 153 static krb5_error_code
 154 DB_rename(krb5_context context, HDB *db, const char *new_name)
 155 {
 156     int ret;
 157     char *old, *new;
 158
 159     asprintf(&old, "%s.db", db->hdb_name);
 160     asprintf(&new, "%s.db", new_name);
 161     ret = rename(old, new);
 162     free(old);
 163     free(new);
 164     if(ret)
 165         return errno;
 166
 167     free(db->hdb_name);
 168     db->hdb_name = strdup(new_name);
 169     return 0;
 170 }
 171
 172 static krb5_error_code
 173 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 174 {
 175     DB *d = (DB*)db->hdb_db;
 176     DBT k, v;
 177     int code;
 178
 179     memset(&k, 0, sizeof(DBT));
 180     memset(&v, 0, sizeof(DBT));
 181     k.data = key.data;
 182     k.size = key.length;
 183     k.flags = 0;
 184     if ((code = (*db->hdb_lock)(context, db, HDB_RLOCK)))
 185         return code;
 186     code = (*d->get)(d, NULL, &k, &v, 0);
 187     (*db->hdb_unlock)(context, db);
 188     if(code == DB_NOTFOUND)
 189         return HDB_ERR_NOENTRY;
 190     if(code)
 191         return code;
 192
 193     krb5_data_copy(reply, v.data, v.size);
 194     return 0;
 195 }
 196
 197 static krb5_error_code
 198 DB__put(krb5_context context, HDB *db, int replace,
 199         krb5_data key, krb5_data value)
 200 {
 201     DB *d = (DB*)db->hdb_db;
 202     DBT k, v;
 203     int code;
 204
 205     memset(&k, 0, sizeof(DBT));
 206     memset(&v, 0, sizeof(DBT));
 207     k.data = key.data;
 208     k.size = key.length;
 209     k.flags = 0;
 210     v.data = value.data;
 211     v.size = value.length;
 212     v.flags = 0;
 213     if ((code = (*db->hdb_lock)(context, db, HDB_WLOCK)))
 214         return code;
 215     code = (*d->put)(d, NULL, &k, &v, replace ? 0 : DB_NOOVERWRITE);
 216     (*db->hdb_unlock)(context, db);
 217     if(code == DB_KEYEXIST)
 218         return HDB_ERR_EXISTS;
 219     if(code)
 220         return errno;
 221     return 0;
 222 }
 223
 224 static krb5_error_code
 225 DB__del(krb5_context context, HDB *db, krb5_data key)
 226 {
 227     DB *d = (DB*)db->hdb_db;
 228     DBT k;
 229     krb5_error_code code;
 230     memset(&k, 0, sizeof(DBT));
 231     k.data = key.data;
 232     k.size = key.length;
 233     k.flags = 0;
 234     code = (*db->hdb_lock)(context, db, HDB_WLOCK);
 235     if(code)
 236         return code;
 237     code = (*d->del)(d, NULL, &k, 0);
 238     (*db->hdb_unlock)(context, db);
 239     if(code == DB_NOTFOUND)
 240         return HDB_ERR_NOENTRY;
 241     if(code)
 242         return code;
 243     return 0;
 244 }
 245
 246 static krb5_error_code
 247 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 248 {
 249     DBC *dbc = NULL;
 250     char *fn;
 251     krb5_error_code ret;
 252     DB *d;
 253     int myflags = 0;
 254
 255     if (flags & O_CREAT)
 256       myflags |= DB_CREATE;
 257
 258     if (flags & O_EXCL)
 259       myflags |= DB_EXCL;
 260
 261     if((flags & O_ACCMODE) == O_RDONLY)
 262       myflags |= DB_RDONLY;
 263
 264     if (flags & O_TRUNC)
 265       myflags |= DB_TRUNCATE;
 266
 267     asprintf(&fn, "%s.db", db->hdb_name);
 268     if (fn == NULL) {
 269         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 270         return ENOMEM;
 271     }
 272     db_create(&d, NULL, 0);
 273     db->hdb_db = d;
 274
 275 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 276     ret = (*d->open)(db->hdb_db, NULL, fn, NULL, DB_BTREE, myflags, mode);
 277 #else
 278     ret = (*d->open)(db->hdb_db, fn, NULL, DB_BTREE, myflags, mode);
 279 #endif
 280
 281     if (ret == ENOENT) {
 282         /* try to open without .db extension */
 283 #if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 1)
 284         ret = (*d->open)(db->hdb_db, NULL, db->hdb_name, NULL, DB_BTREE,
 285                          myflags, mode);
 286 #else
 287         ret = (*d->open)(db->hdb_db, db->hdb_name, NULL, DB_BTREE,
 288                          myflags, mode);
 289 #endif
 290     }
 291
 292     if (ret) {
 293         free(fn);
 294         krb5_set_error_message(context, ret, "opening %s: %s",
 295                               db->hdb_name, strerror(ret));
 296         return ret;
 297     }
 298     free(fn);
 299
 300     ret = (*d->cursor)(d, NULL, &dbc, 0);
 301     if (ret) {
 302         krb5_set_error_message(context, ret, "d->cursor: %s", strerror(ret));
 303         return ret;
 304     }
 305     db->hdb_dbc = dbc;
 306
 307     if((flags & O_ACCMODE) == O_RDONLY)
 308         ret = hdb_check_db_format(context, db);
 309     else
 310         ret = hdb_init_db(context, db);
 311     if(ret == HDB_ERR_NOENTRY)
 312         return 0;
 313     if (ret) {
 314         DB_close(context, db);
 315         krb5_set_error_message(context, ret, "hdb_open: failed %s database %s",
 316                                (flags & O_ACCMODE) == O_RDONLY ?
 317                                "checking format of" : "initialize",
 318                                db->hdb_name);
 319     }
 320
 321     return ret;
 322 }
 323
 324 krb5_error_code
 325 hdb_db_create(krb5_context context, HDB **db,
 326               const char *filename)
 327 {
 328     *db = calloc(1, sizeof(**db));
 329     if (*db == NULL) {
 330         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 331         return ENOMEM;
 332     }
 333
 334     (*db)->hdb_db = NULL;
 335     (*db)->hdb_name = strdup(filename);
 336     if ((*db)->hdb_name == NULL) {
 337         free(*db);
 338         *db = NULL;
 339         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 340         return ENOMEM;
 341     }
 342     (*db)->hdb_master_key_set = 0;
 343     (*db)->hdb_openp = 0;
 344     (*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
 345     (*db)->hdb_open  = DB_open;
 346     (*db)->hdb_close = DB_close;
 347     (*db)->hdb_fetch = _hdb_fetch;
 348     (*db)->hdb_store = _hdb_store;
 349     (*db)->hdb_remove = _hdb_remove;
 350     (*db)->hdb_firstkey = DB_firstkey;
 351     (*db)->hdb_nextkey= DB_nextkey;
 352     (*db)->hdb_lock = DB_lock;
 353     (*db)->hdb_unlock = DB_unlock;
 354     (*db)->hdb_rename = DB_rename;
 355     (*db)->hdb__get = DB__get;
 356     (*db)->hdb__put = DB__put;
 357     (*db)->hdb__del = DB__del;
 358     (*db)->hdb_destroy = DB_destroy;
 359     return 0;
 360 }
 361 #endif /* HAVE_DB3 */