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_DB4_DB_H
  39 #include <db4/db.h>
  40 #elif defined(HAVE_DB3_DB_H)
  41 #include <db3/db.h>
  42 #else
  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->hdb_db;
  50     DBC *dbcp = (DBC*)db->hdb_dbc;
  51
  52     (*dbcp->c_close)(dbcp);
  53     db->hdb_dbc = 0;
  54     (*d->close)(d, 0);
  55     return 0;
  56 }
  57
  58 static krb5_error_code
  59 DB_destroy(krb5_context context, HDB *db)
  60 {
  61     krb5_error_code ret;
  62
  63     ret = hdb_clear_master_key (context, db);
  64     free(db->hdb_name);
  65     free(db);
  66     return ret;
  67 }
  68
  69 static krb5_error_code
  70 DB_lock(krb5_context context, HDB *db, int operation)
  71 {
  72     DB *d = (DB*)db->hdb_db;
  73     int fd;
  74     if ((*d->fd)(d, &fd))
  75         return HDB_ERR_CANT_LOCK_DB;
  76     return hdb_lock(fd, operation);
  77 }
  78
  79 static krb5_error_code
  80 DB_unlock(krb5_context context, HDB *db)
  81 {
  82     DB *d = (DB*)db->hdb_db;
  83     int fd;
  84     if ((*d->fd)(d, &fd))
  85         return HDB_ERR_CANT_LOCK_DB;
  86     return hdb_unlock(fd);
  87 }
  88
  89
  90 static krb5_error_code
  91 DB_seq(krb5_context context, HDB *db,
  92        unsigned flags, hdb_entry_ex *entry, int flag)
  93 {
  94     DBT key, value;
  95     DBC *dbcp = db->hdb_dbc;
  96     krb5_data key_data, data;
  97     int code;
  98
  99     memset(&key, 0, sizeof(DBT));
 100     memset(&value, 0, sizeof(DBT));
 101     if ((*db->hdb_lock)(context, db, HDB_RLOCK))
 102         return HDB_ERR_DB_INUSE;
 103     code = (*dbcp->c_get)(dbcp, &key, &value, flag);
 104     (*db->hdb_unlock)(context, db); /* XXX check value */
 105     if (code == DB_NOTFOUND)
 106         return HDB_ERR_NOENTRY;
 107     if (code)
 108         return code;
 109
 110     key_data.data = key.data;
 111     key_data.length = key.size;
 112     data.data = value.data;
 113     data.length = value.size;
 114     memset(entry, 0, sizeof(*entry));
 115     if (hdb_value2entry(context, &data, &entry->entry))
 116         return DB_seq(context, db, flags, entry, DB_NEXT);
 117     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 118         code = hdb_unseal_keys (context, db, &entry->entry);
 119         if (code)
 120             hdb_free_entry (context, entry);
 121     }
 122     if (entry->entry.principal == NULL) {
 123         entry->entry.principal = malloc(sizeof(*entry->entry.principal));
 124         if (entry->entry.principal == NULL) {
 125             hdb_free_entry (context, entry);
 126             krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 127             return ENOMEM;
 128         } else {
 129             hdb_key2principal(context, &key_data, entry->entry.principal);
 130         }
 131     }
 132     return 0;
 133 }
 134
 135
 136 static krb5_error_code
 137 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 138 {
 139     return DB_seq(context, db, flags, entry, DB_FIRST);
 140 }
 141
 142
 143 static krb5_error_code
 144 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 145 {
 146     return DB_seq(context, db, flags, entry, DB_NEXT);
 147 }
 148
 149 static krb5_error_code
 150 DB_rename(krb5_context context, HDB *db, const char *new_name)
 151 {
 152     int ret;
 153     char *old, *new;
 154
 155     asprintf(&old, "%s.db", db->hdb_name);
 156     asprintf(&new, "%s.db", new_name);
 157     ret = rename(old, new);
 158     free(old);
 159     free(new);
 160     if(ret)
 161         return errno;
 162
 163     free(db->hdb_name);
 164     db->hdb_name = strdup(new_name);
 165     return 0;
 166 }
 167
 168 static krb5_error_code
 169 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 170 {
 171     DB *d = (DB*)db->hdb_db;
 172     DBT k, v;
 173     int code;
 174
 175     memset(&k, 0, sizeof(DBT));
 176     memset(&v, 0, sizeof(DBT));
 177     k.data = key.data;
 178     k.size = key.length;
 179     k.flags = 0;
 180     if ((code = (*db->hdb_lock)(context, db, HDB_RLOCK)))
 181         return code;
 182     code = (*d->get)(d, NULL, &k, &v, 0);
 183     (*db->hdb_unlock)(context, db);
 184     if(code == DB_NOTFOUND)
 185         return HDB_ERR_NOENTRY;
 186     if(code)
 187         return code;
 188
 189     krb5_data_copy(reply, v.data, v.size);
 190     return 0;
 191 }
 192
 193 static krb5_error_code
 194 DB__put(krb5_context context, HDB *db, int replace,
 195         krb5_data key, krb5_data value)
 196 {
 197     DB *d = (DB*)db->hdb_db;
 198     DBT k, v;
 199     int code;
 200
 201     memset(&k, 0, sizeof(DBT));
 202     memset(&v, 0, sizeof(DBT));
 203     k.data = key.data;
 204     k.size = key.length;
 205     k.flags = 0;
 206     v.data = value.data;
 207     v.size = value.length;
 208     v.flags = 0;
 209     if ((code = (*db->hdb_lock)(context, db, HDB_WLOCK)))
 210         return code;
 211     code = (*d->put)(d, NULL, &k, &v, replace ? 0 : DB_NOOVERWRITE);
 212     (*db->hdb_unlock)(context, db);
 213     if(code == DB_KEYEXIST)
 214         return HDB_ERR_EXISTS;
 215     if(code)
 216         return errno;
 217     return 0;
 218 }
 219
 220 static krb5_error_code
 221 DB__del(krb5_context context, HDB *db, krb5_data key)
 222 {
 223     DB *d = (DB*)db->hdb_db;
 224     DBT k;
 225     krb5_error_code code;
 226     memset(&k, 0, sizeof(DBT));
 227     k.data = key.data;
 228     k.size = key.length;
 229     k.flags = 0;
 230     code = (*db->hdb_lock)(context, db, HDB_WLOCK);
 231     if(code)
 232         return code;
 233     code = (*d->del)(d, NULL, &k, 0);
 234     (*db->hdb_unlock)(context, db);
 235     if(code == DB_NOTFOUND)
 236         return HDB_ERR_NOENTRY;
 237     if(code)
 238         return code;
 239     return 0;
 240 }
 241
 242 static krb5_error_code
 243 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 244 {
 245     DBC *dbc = NULL;
 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_message(context, ENOMEM, "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,
 281                          myflags, mode);
 282 #else
 283         ret = (*d->open)(db->hdb_db, db->hdb_name, NULL, DB_BTREE,
 284                          myflags, mode);
 285 #endif
 286     }
 287
 288     if (ret) {
 289         free(fn);
 290         krb5_set_error_message(context, ret, "opening %s: %s",
 291                               db->hdb_name, strerror(ret));
 292         return ret;
 293     }
 294     free(fn);
 295
 296     ret = (*d->cursor)(d, NULL, &dbc, 0);
 297     if (ret) {
 298         krb5_set_error_message(context, ret, "d->cursor: %s", strerror(ret));
 299         return ret;
 300     }
 301     db->hdb_dbc = dbc;
 302
 303     if((flags & O_ACCMODE) == O_RDONLY)
 304         ret = hdb_check_db_format(context, db);
 305     else
 306         ret = hdb_init_db(context, db);
 307     if(ret == HDB_ERR_NOENTRY)
 308         return 0;
 309     if (ret) {
 310         DB_close(context, db);
 311         krb5_set_error_message(context, ret, "hdb_open: failed %s database %s",
 312                                (flags & O_ACCMODE) == O_RDONLY ?
 313                                "checking format of" : "initialize",
 314                                db->hdb_name);
 315     }
 316
 317     return ret;
 318 }
 319
 320 krb5_error_code
 321 hdb_db_create(krb5_context context, HDB **db,
 322               const char *filename)
 323 {
 324     *db = calloc(1, sizeof(**db));
 325     if (*db == NULL) {
 326         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 327         return ENOMEM;
 328     }
 329
 330     (*db)->hdb_db = NULL;
 331     (*db)->hdb_name = strdup(filename);
 332     if ((*db)->hdb_name == NULL) {
 333         free(*db);
 334         *db = NULL;
 335         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 336         return ENOMEM;
 337     }
 338     (*db)->hdb_master_key_set = 0;
 339     (*db)->hdb_openp = 0;
 340     (*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
 341     (*db)->hdb_open  = DB_open;
 342     (*db)->hdb_close = DB_close;
 343     (*db)->hdb_fetch = _hdb_fetch;
 344     (*db)->hdb_store = _hdb_store;
 345     (*db)->hdb_remove = _hdb_remove;
 346     (*db)->hdb_firstkey = DB_firstkey;
 347     (*db)->hdb_nextkey= DB_nextkey;
 348     (*db)->hdb_lock = DB_lock;
 349     (*db)->hdb_unlock = DB_unlock;
 350     (*db)->hdb_rename = DB_rename;
 351     (*db)->hdb__get = DB__get;
 352     (*db)->hdb__put = DB__put;
 353     (*db)->hdb__del = DB__del;
 354     (*db)->hdb_destroy = DB_destroy;
 355     return 0;
 356 }
 357 #endif /* HAVE_DB3 */