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 typedef struct {
  45     HDB hdb;            /* generic members */
  46     int lock_fd;        /* DB-specific */
  47 } DB1_HDB;
  48
  49 static krb5_error_code
  50 DB_close(krb5_context context, HDB *db)
  51 {
  52     DB1_HDB *db1 = (DB1_HDB *)db;
  53     DB *d = (DB*)db->hdb_db;
  54
  55     heim_assert(d != 0, "Closing already closed HDB");
  56
  57     (*d->close)(d);
  58     db->hdb_db = 0;
  59
  60     if (db1->lock_fd >= 0) {
  61         close(db1->lock_fd);
  62         db1->lock_fd = -1;
  63     }
  64
  65     return 0;
  66 }
  67
  68 static krb5_error_code
  69 DB_destroy(krb5_context context, HDB *db)
  70 {
  71     krb5_error_code ret;
  72
  73     ret = hdb_clear_master_key (context, db);
  74     free(db->hdb_name);
  75     free(db);
  76     return ret;
  77 }
  78
  79 static krb5_error_code
  80 DB_lock(krb5_context context, HDB *db, int operation)
  81 {
  82
  83     return 0;
  84 }
  85
  86 static krb5_error_code
  87 DB_unlock(krb5_context context, HDB *db)
  88 {
  89
  90     return 0;
  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     DB *d = (DB*)db->hdb_db;
  99     DBT key, value;
 100     krb5_data key_data, data;
 101     int code;
 102
 103     code = (*d->seq)(d, &key, &value, flag);
 104     if(code == -1) {
 105         code = errno;
 106         krb5_set_error_message(context, code, "Database %s seq error: %s",
 107                                db->hdb_name, strerror(code));
 108         return code;
 109     }
 110     if(code == 1) {
 111         krb5_clear_error_message(context);
 112         return HDB_ERR_NOENTRY;
 113     }
 114
 115     key_data.data = key.data;
 116     key_data.length = key.size;
 117     data.data = value.data;
 118     data.length = value.size;
 119     memset(entry, 0, sizeof(*entry));
 120     if (hdb_value2entry(context, &data, &entry->entry))
 121         return DB_seq(context, db, flags, entry, R_NEXT);
 122     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
 123         code = hdb_unseal_keys (context, db, &entry->entry);
 124         if (code)
 125             hdb_free_entry (context, entry);
 126     }
 127     if (code == 0 && entry->entry.principal == NULL) {
 128         entry->entry.principal = malloc(sizeof(*entry->entry.principal));
 129         if (entry->entry.principal == NULL) {
 130             code = ENOMEM;
 131             krb5_set_error_message(context, code, "malloc: out of memory");
 132             hdb_free_entry (context, entry);
 133         } else {
 134             hdb_key2principal(context, &key_data, entry->entry.principal);
 135         }
 136     }
 137     return code;
 138 }
 139
 140
 141 static krb5_error_code
 142 DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 143 {
 144     return DB_seq(context, db, flags, entry, R_FIRST);
 145 }
 146
 147
 148 static krb5_error_code
 149 DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
 150 {
 151     return DB_seq(context, db, flags, entry, R_NEXT);
 152 }
 153
 154 static krb5_error_code
 155 DB_rename(krb5_context context, HDB *db, const char *new_name)
 156 {
 157     int ret;
 158     char *old, *new;
 159
 160     asprintf(&old, "%s.db", db->hdb_name);
 161     asprintf(&new, "%s.db", new_name);
 162     ret = rename(old, new);
 163     free(old);
 164     free(new);
 165     if(ret)
 166         return errno;
 167
 168     free(db->hdb_name);
 169     db->hdb_name = strdup(new_name);
 170     return 0;
 171 }
 172
 173 static krb5_error_code
 174 DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
 175 {
 176     DB *d = (DB*)db->hdb_db;
 177     DBT k, v;
 178     int code;
 179
 180     k.data = key.data;
 181     k.size = key.length;
 182     code = (*d->get)(d, &k, &v, 0);
 183     if(code < 0) {
 184         code = errno;
 185         krb5_set_error_message(context, code, "Database %s get error: %s",
 186                                db->hdb_name, strerror(code));
 187         return code;
 188     }
 189     if(code == 1) {
 190         krb5_clear_error_message(context);
 191         return HDB_ERR_NOENTRY;
 192     }
 193
 194     krb5_data_copy(reply, v.data, v.size);
 195     return 0;
 196 }
 197
 198 static krb5_error_code
 199 DB__put(krb5_context context, HDB *db, int replace,
 200         krb5_data key, krb5_data value)
 201 {
 202     DB *d = (DB*)db->hdb_db;
 203     DBT k, v;
 204     int code;
 205
 206     k.data = key.data;
 207     k.size = key.length;
 208     v.data = value.data;
 209     v.size = value.length;
 210     code = (*d->put)(d, &k, &v, replace ? 0 : R_NOOVERWRITE);
 211     if(code < 0) {
 212         code = errno;
 213         krb5_set_error_message(context, code, "Database %s put error: %s",
 214                                db->hdb_name, strerror(code));
 215         return code;
 216     }
 217     if(code == 1) {
 218         krb5_clear_error_message(context);
 219         return HDB_ERR_EXISTS;
 220     }
 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     k.data = key.data;
 231     k.size = key.length;
 232     code = (*d->del)(d, &k, 0);
 233     if(code == 1) {
 234         code = errno;
 235         krb5_set_error_message(context, code, "Database %s put error: %s",
 236                                db->hdb_name, strerror(code));
 237         return code;
 238     }
 239     if(code < 0)
 240         return errno;
 241     return 0;
 242 }
 243
 244 static DB *
 245 _open_db(char *fn, int flags, int mode, int *fd)
 246 {
 247 #ifndef O_EXLOCK
 248     int op;
 249     int ret;
 250
 251     *fd = open(fn, flags, mode);
 252     if (*fd == -1)
 253         return NULL;
 254
 255     if ((flags & O_ACCMODE) == O_RDONLY)
 256         op = LOCK_SH;
 257     else
 258         op = LOCK_EX;
 259
 260     ret = flock(*fd, op);
 261     if (ret == -1) {
 262         int saved_errno;
 263
 264         saved_errno = errno;
 265         close(*fd);
 266         errno = saved_errno;
 267         return NULL;
 268     }
 269 #else
 270     if ((flags & O_ACCMODE) == O_RDONLY)
 271         flags |= O_SHLOCK;
 272     else
 273         flags |= O_EXLOCK;
 274 #endif
 275
 276     return dbopen(fn, flags, mode, DB_BTREE, NULL);
 277 }
 278
 279 static krb5_error_code
 280 DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
 281 {
 282     DB1_HDB *db1 = (DB1_HDB *)db;
 283     char *fn;
 284     krb5_error_code ret;
 285
 286     asprintf(&fn, "%s.db", db->hdb_name);
 287     if (fn == NULL) {
 288         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 289         return ENOMEM;
 290     }
 291     db->hdb_db = _open_db(fn, flags, mode, &db1->lock_fd);
 292     free(fn);
 293     /* try to open without .db extension */
 294     if(db->hdb_db == NULL && errno == ENOENT)
 295         db->hdb_db = _open_db(db->hdb_name, flags, mode, &db1->lock_fd);
 296     if(db->hdb_db == NULL) {
 297         krb5_set_error_message(context, errno, "dbopen (%s): %s",
 298                               db->hdb_name, strerror(errno));
 299         return errno;
 300     }
 301     if((flags & O_ACCMODE) == O_RDONLY)
 302         ret = hdb_check_db_format(context, db);
 303     else
 304         ret = hdb_init_db(context, db);
 305     if(ret == HDB_ERR_NOENTRY) {
 306         krb5_clear_error_message(context);
 307         return 0;
 308     }
 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     return ret;
 317 }
 318
 319 krb5_error_code
 320 hdb_db_create(krb5_context context, HDB **db,
 321               const char *filename)
 322 {
 323     DB1_HDB **db1 = (DB1_HDB **)db;
 324     *db = calloc(1, sizeof(**db1));     /* Allocate space for the larger db1 */
 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_kvno = _hdb_fetch_kvno;
 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
 356     (*db1)->lock_fd = -1;
 357     return 0;
 358 }
 359
 360 #endif /* HAVE_DB1 */