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 #if HAVE_DB1
  37
  38 #if defined(HAVE_DB_185_H)
  39 #include <db_185.h>
  40 #elif defined(HAVE_DB_H)
  41 #include <db.h>
  42 #endif
  43
  44 static krb5_error_code
  45 DB_close(krb5_context context, HDB *db)
  46 {
  47     DB *d = (DB*)db->hdb_db;
  48     (*d->close)(d);
  49     return 0;
  50 }
  51
  52 static krb5_error_code
  53 DB_destroy(krb5_context context, HDB *db)
  54 {
  55     krb5_error_code ret;
  56
  57     ret = hdb_clear_master_key (context, db);
  58     free(db->hdb_name);
  59     free(db);
  60     return ret;
  61 }
  62
  63 static krb5_error_code
  64 DB_lock(krb5_context context, HDB *db, int operation)
  65 {
  66     DB *d = (DB*)db->hdb_db;
  67     int fd = (*d->fd)(d);
  68     if(fd < 0) {
  69         krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
  70                                "Can't lock database: %s", db->hdb_name);
  71         return HDB_ERR_CANT_LOCK_DB;
  72     }
  73     return hdb_lock(fd, operation);
  74 }
  75
  76 static krb5_error_code
  77 DB_unlock(krb5_context context, HDB *db)
  78 {
  79     DB *d = (DB*)db->hdb_db;
  80     int fd = (*d->fd)(d);
  81     if(fd < 0) {
  82         krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
  83                                "Can't unlock database: %s", db->hdb_name);
  84         return HDB_ERR_CANT_LOCK_DB;
  85     }
  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     DB *d = (DB*)db->hdb_db;
  95     DBT key, value;
  96     krb5_data key_data, data;
  97     int code;
  98
  99     code = db->hdb_lock(context, db, HDB_RLOCK);
 100     if(code == -1) {
 101         krb5_set_error_message(context, HDB_ERR_DB_INUSE, "Database %s in use", db->hdb_name);
 102         return HDB_ERR_DB_INUSE;
 103     }
 104     code = (*d->seq)(d, &key, &value, flag);
 105     db->hdb_unlock(context, db); /* XXX check value */
 106     if(code == -1) {
 107         code = errno;
 108         krb5_set_error_message(context, code, "Database %s seq error: %s",
 109                                db->hdb_name, strerror(code));
 110         return code;
 111     }
 112     if(code == 1) {
 113         krb5_clear_error_message(context);
 114         return HDB_ERR_NOENTRY;
 115     }
 116
 117     key_data.data = key.data;
 118     key_data.length = key.size;
 119     data.data = value.data;
 120     data.length = value.size;
 121     memset(entry, 0, sizeof(*entry));
 122     if (hdb_value2entry(context, &data, &entry->entry))
 123         return DB_seq(context, db, flags, entry, R_NEXT);
 124     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 125         code = hdb_unseal_keys (context, db, &entry->entry);
 126         if (code)
 127             hdb_free_entry (context, entry);
 128     }
 129     if (code == 0 && entry->entry.principal == NULL) {
 130         entry->entry.principal = malloc(sizeof(*entry->entry.principal));
 131         if (entry->entry.principal == NULL) {
 132             code = ENOMEM;
 133             krb5_set_error_message(context, code, "malloc: out of memory");
 134             hdb_free_entry (context, entry);
 135         } else {
 136             hdb_key2principal(context, &key_data, entry->entry.principal);
 137         }
 138     }
 139     return code;
 140 }
 141
 142
 143 static krb5_error_code
 144 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 145 {
 146     return DB_seq(context, db, flags, entry, R_FIRST);
 147 }
 148
 149
 150 static krb5_error_code
 151 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 152 {
 153     return DB_seq(context, db, flags, entry, R_NEXT);
 154 }
 155
 156 static krb5_error_code
 157 DB_rename(krb5_context context, HDB *db, const char *new_name)
 158 {
 159     int ret;
 160     char *old, *new;
 161
 162     asprintf(&old, "%s.db", db->hdb_name);
 163     asprintf(&new, "%s.db", new_name);
 164     ret = rename(old, new);
 165     free(old);
 166     free(new);
 167     if(ret)
 168         return errno;
 169
 170     free(db->hdb_name);
 171     db->hdb_name = strdup(new_name);
 172     return 0;
 173 }
 174
 175 static krb5_error_code
 176 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 177 {
 178     DB *d = (DB*)db->hdb_db;
 179     DBT k, v;
 180     int code;
 181
 182     k.data = key.data;
 183     k.size = key.length;
 184     code = db->hdb_lock(context, db, HDB_RLOCK);
 185     if(code)
 186         return code;
 187     code = (*d->get)(d, &k, &v, 0);
 188     db->hdb_unlock(context, db);
 189     if(code < 0) {
 190         code = errno;
 191         krb5_set_error_message(context, code, "Database %s get error: %s",
 192                                db->hdb_name, strerror(code));
 193         return code;
 194     }
 195     if(code == 1) {
 196         krb5_clear_error_message(context);
 197         return HDB_ERR_NOENTRY;
 198     }
 199
 200     krb5_data_copy(reply, v.data, v.size);
 201     return 0;
 202 }
 203
 204 static krb5_error_code
 205 DB__put(krb5_context context, HDB *db, int replace,
 206         krb5_data key, krb5_data value)
 207 {
 208     DB *d = (DB*)db->hdb_db;
 209     DBT k, v;
 210     int code;
 211
 212     k.data = key.data;
 213     k.size = key.length;
 214     v.data = value.data;
 215     v.size = value.length;
 216     code = db->hdb_lock(context, db, HDB_WLOCK);
 217     if(code)
 218         return code;
 219     code = (*d->put)(d, &k, &v, replace ? 0 : R_NOOVERWRITE);
 220     db->hdb_unlock(context, db);
 221     if(code < 0) {
 222         code = errno;
 223         krb5_set_error_message(context, code, "Database %s put error: %s",
 224                                db->hdb_name, strerror(code));
 225         return code;
 226     }
 227     if(code == 1) {
 228         krb5_clear_error_message(context);
 229         return HDB_ERR_EXISTS;
 230     }
 231     return 0;
 232 }
 233
 234 static krb5_error_code
 235 DB__del(krb5_context context, HDB *db, krb5_data key)
 236 {
 237     DB *d = (DB*)db->hdb_db;
 238     DBT k;
 239     krb5_error_code code;
 240     k.data = key.data;
 241     k.size = key.length;
 242     code = db->hdb_lock(context, db, HDB_WLOCK);
 243     if(code)
 244         return code;
 245     code = (*d->del)(d, &k, 0);
 246     db->hdb_unlock(context, db);
 247     if(code == 1) {
 248         code = errno;
 249         krb5_set_error_message(context, code, "Database %s put error: %s",
 250                                db->hdb_name, strerror(code));
 251         return code;
 252     }
 253     if(code < 0)
 254         return errno;
 255     return 0;
 256 }
 257
 258 static krb5_error_code
 259 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 260 {
 261     char *fn;
 262     krb5_error_code ret;
 263
 264     asprintf(&fn, "%s.db", db->hdb_name);
 265     if (fn == NULL) {
 266         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 267         return ENOMEM;
 268     }
 269     db->hdb_db = dbopen(fn, flags, mode, DB_BTREE, NULL);
 270     free(fn);
 271     /* try to open without .db extension */
 272     if(db->hdb_db == NULL && errno == ENOENT)
 273         db->hdb_db = dbopen(db->hdb_name, flags, mode, DB_BTREE, NULL);
 274     if(db->hdb_db == NULL) {
 275         ret = errno;
 276         krb5_set_error_message(context, ret, "dbopen (%s): %s",
 277                               db->hdb_name, strerror(ret));
 278         return ret;
 279     }
 280     if((flags & O_ACCMODE) == O_RDONLY)
 281         ret = hdb_check_db_format(context, db);
 282     else
 283         ret = hdb_init_db(context, db);
 284     if(ret == HDB_ERR_NOENTRY) {
 285         krb5_clear_error_message(context);
 286         return 0;
 287     }
 288     if (ret) {
 289         DB_close(context, db);
 290         krb5_set_error_message(context, ret, "hdb_open: failed %s database %s",
 291                               (flags & O_ACCMODE) == O_RDONLY ?
 292                               "checking format of" : "initialize",
 293                               db->hdb_name);
 294     }
 295     return ret;
 296 }
 297
 298 krb5_error_code
 299 hdb_db_create(krb5_context context, HDB **db,
 300               const char *filename)
 301 {
 302     *db = calloc(1, sizeof(**db));
 303     if (*db == NULL) {
 304         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 305         return ENOMEM;
 306     }
 307
 308     (*db)->hdb_db = NULL;
 309     (*db)->hdb_name = strdup(filename);
 310     if ((*db)->hdb_name == NULL) {
 311         free(*db);
 312         *db = NULL;
 313         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 314         return ENOMEM;
 315     }
 316     (*db)->hdb_master_key_set = 0;
 317     (*db)->hdb_openp = 0;
 318     (*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
 319     (*db)->hdb_open = DB_open;
 320     (*db)->hdb_close = DB_close;
 321     (*db)->hdb_fetch = _hdb_fetch;
 322     (*db)->hdb_store = _hdb_store;
 323     (*db)->hdb_remove = _hdb_remove;
 324     (*db)->hdb_firstkey = DB_firstkey;
 325     (*db)->hdb_nextkey= DB_nextkey;
 326     (*db)->hdb_lock = DB_lock;
 327     (*db)->hdb_unlock = DB_unlock;
 328     (*db)->hdb_rename = DB_rename;
 329     (*db)->hdb__get = DB__get;
 330     (*db)->hdb__put = DB__put;
 331     (*db)->hdb__del = DB__del;
 332     (*db)->hdb_destroy = DB_destroy;
 333     return 0;
 334 }
 335
 336 #endif /* HAVE_DB1 */