/* $NetBSD: db3.c,v 1.2 2017/01/28 21:31:48 christos Exp $ */
/*
* Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "hdb_locl.h"
#include <fcntl.h>
#if HAVE_DB3
#ifdef HAVE_DBHEADER
#include <db.h>
#elif HAVE_DB6_DB_H
#include <db6/db.h>
#elif HAVE_DB5_DB_H
#include <db5/db.h>
#elif HAVE_DB4_DB_H
#include <db4/db.h>
#elif HAVE_DB3_DB_H
#include <db3/db.h>
#else
#include <db.h>
#endif
typedef struct {
HDB hdb; /* generic members */
int lock_fd; /* DB3-specific */
} DB3_HDB;
static krb5_error_code
DB_close(krb5_context context, HDB *db)
{
DB3_HDB *db3 = (DB3_HDB *)db;
DB *d = (DB*)db->hdb_db;
DBC *dbcp = (DBC*)db->hdb_dbc;
heim_assert(d != 0, "Closing already closed HDB");
if (dbcp != NULL)
dbcp->c_close(dbcp);
if (d != NULL)
d->close(d, 0);
if (db3->lock_fd >= 0)
close(db3->lock_fd);
db3->lock_fd = -1;
db->hdb_dbc = 0;
db->hdb_db = 0;
return 0;
}
static krb5_error_code
DB_destroy(krb5_context context, HDB *db)
{
krb5_error_code ret;
ret = hdb_clear_master_key (context, db);
free(db->hdb_name);
free(db);
return ret;
}
static krb5_error_code
DB_lock(krb5_context context, HDB *db, int operation)
{
return 0;
}
static krb5_error_code
DB_unlock(krb5_context context, HDB *db)
{
return 0;
}
static krb5_error_code
DB_seq(krb5_context context, HDB *db,
unsigned flags, hdb_entry_ex *entry, int flag)
{
DBT key, value;
DBC *dbcp = db->hdb_dbc;
krb5_data key_data, data;
int code;
memset(&key, 0, sizeof(DBT));
memset(&value, 0, sizeof(DBT));
code = (*dbcp->c_get)(dbcp, &key, &value, flag);
if (code == DB_NOTFOUND)
return HDB_ERR_NOENTRY;
if (code)
return code;
key_data.data = key.data;
key_data.length = key.size;
data.data = value.data;
data.length = value.size;
memset(entry, 0, sizeof(*entry));
if (hdb_value2entry(context, &data, &entry->entry))
return DB_seq(context, db, flags, entry, DB_NEXT);
if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
code = hdb_unseal_keys (context, db, &entry->entry);
if (code)
hdb_free_entry (context, entry);
}
if (entry->entry.principal == NULL) {
entry->entry.principal = malloc(sizeof(*entry->entry.principal));
if (entry->entry.principal == NULL) {
hdb_free_entry (context, entry);
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
} else {
hdb_key2principal(context, &key_data, entry->entry.principal);
}
}
return 0;
}
static krb5_error_code
DB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
{
return DB_seq(context, db, flags, entry, DB_FIRST);
}
static krb5_error_code
DB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
{
return DB_seq(context, db, flags, entry, DB_NEXT);
}
static krb5_error_code
DB_rename(krb5_context context, HDB *db, const char *new_name)
{
int ret;
char *old, *new;
if (strncmp(new_name, "db:", sizeof("db:") - 1) == 0)
new_name += sizeof("db:") - 1;
else if (strncmp(new_name, "db3:", sizeof("db3:") - 1) == 0)
new_name += sizeof("db3:") - 1;
ret = asprintf(&old, "%s.db", db->hdb_name);
if (ret == -1)
return ENOMEM;
ret = asprintf(&new, "%s.db", new_name);
if (ret == -1) {
free(old);
return ENOMEM;
}
ret = rename(old, new);
free(old);
if(ret) {
free(new);
return errno;
}
free(db->hdb_name);
new[strlen(new) - 3] = '\0';
db->hdb_name = new;
return 0;
}
static krb5_error_code
DB__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
{
DB *d = (DB*)db->hdb_db;
DBT k, v;
int code;
memset(&k, 0, sizeof(DBT));
memset(&v, 0, sizeof(DBT));
k.data = key.data;
k.size = key.length;
k.flags = 0;
code = (*d->get)(d, NULL, &k, &v, 0);
if(code == DB_NOTFOUND)
return HDB_ERR_NOENTRY;
if(code)
return code;
krb5_data_copy(reply, v.data, v.size);
return 0;
}
static krb5_error_code
DB__put(krb5_context context, HDB *db, int replace,
krb5_data key, krb5_data value)
{
DB *d = (DB*)db->hdb_db;
DBT k, v;
int code;
memset(&k, 0, sizeof(DBT));
memset(&v, 0, sizeof(DBT));
k.data = key.data;
k.size = key.length;
k.flags = 0;
v.data = value.data;
v.size = value.length;
v.flags = 0;
code = (*d->put)(d, NULL, &k, &v, replace ? 0 : DB_NOOVERWRITE);
if(code == DB_KEYEXIST)
return HDB_ERR_EXISTS;
if (code) {
/*
* Berkeley DB 3 and up have a terrible error reporting
* interface...
*
* DB->err() doesn't output a string.
* DB->set_errcall()'s callback function doesn't have a void *
* argument that can be used to place the error somewhere.
*
* The only thing we could do is fopen()/fdopen() a file, set it
* with DB->set_errfile(), then call DB->err(), then read the
* message from the file, unset it with DB->set_errfile(), close
* it and delete it. That's a lot of work... so we don't do it.
*/
if (code == EACCES || code == ENOSPC || code == EINVAL) {
krb5_set_error_message(context, code,
"Database %s put error: %s",
db->hdb_name, strerror(code));
} else {
code = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, code,
"Database %s put error: unknown (%d)",
db->hdb_name, code);
}
return code;
}
code = (*d->sync)(d, 0);
if (code) {
if (code == EACCES || code == ENOSPC || code == EINVAL) {
krb5_set_error_message(context, code,
"Database %s put sync error: %s",
db->hdb_name, strerror(code));
} else {
code = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, code,
"Database %s put sync error: unknown (%d)",
db->hdb_name, code);
}
return code;
}
return 0;
}
static krb5_error_code
DB__del(krb5_context context, HDB *db, krb5_data key)
{
DB *d = (DB*)db->hdb_db;
DBT k;
krb5_error_code code;
memset(&k, 0, sizeof(DBT));
k.data = key.data;
k.size = key.length;
k.flags = 0;
code = (*d->del)(d, NULL, &k, 0);
if(code == DB_NOTFOUND)
return HDB_ERR_NOENTRY;
if (code) {
if (code == EACCES || code == ENOSPC || code == EINVAL) {
krb5_set_error_message(context, code,
"Database %s del error: %s",
db->hdb_name, strerror(code));
} else {
code = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, code,
"Database %s del error: unknown (%d)",
db->hdb_name, code);
}
return code;
}
code = (*d->sync)(d, 0);
if (code) {
if (code == EACCES || code == ENOSPC || code == EINVAL) {
krb5_set_error_message(context, code,
"Database %s del sync error: %s",
db->hdb_name, strerror(code));
} else {
code = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, code,
"Database %s del sync error: unknown (%d)",
db->hdb_name, code);
}
return code;
}
return 0;
}
#define RD_CACHE_SZ 0x8000 /* Minimal read cache size */
#define WR_CACHE_SZ 0x8000 /* Minimal write cache size */
static int
_open_db(DB *d, char *fn, int myflags, int flags, mode_t mode, int *fd)
{
int ret;
int cache_size = (myflags & DB_RDONLY) ? RD_CACHE_SZ : WR_CACHE_SZ;
*fd = open(fn, flags, mode);
if (*fd == -1)
return errno;
/*
* Without DB_FCNTL_LOCKING, the DB library complains when initializing
* a database in an empty file. Since the database is our lock file,
* we create it before Berkeley DB does, so a new DB always starts empty.
*/
myflags |= DB_FCNTL_LOCKING;
ret = flock(*fd, (myflags&DB_RDONLY) ? LOCK_SH : LOCK_EX);
if (ret == -1) {
ret = errno;
close(*fd);
*fd = -1;
return ret;
}
d->set_cachesize(d, 0, cache_size, 0);
#if (DB_VERSION_MAJOR > 4) || ((DB_VERSION_MAJOR == 4) && (DB_VERSION_MINOR >= 1))
ret = (*d->open)(d, NULL, fn, NULL, DB_BTREE, myflags, mode);
#else
ret = (*d->open)(d, fn, NULL, DB_BTREE, myflags, mode);
#endif
if (ret != 0) {
close(*fd);
*fd = -1;
}
return ret;
}
static krb5_error_code
DB_open(krb5_context context, HDB *db, int flags, mode_t mode)
{
DB3_HDB *db3 = (DB3_HDB *)db;
DBC *dbc = NULL;
char *fn;
krb5_error_code ret;
DB *d;
int myflags = 0;
int aret;
heim_assert(db->hdb_db == 0, "Opening already open HDB");
if (flags & O_CREAT)
myflags |= DB_CREATE;
if (flags & O_EXCL)
myflags |= DB_EXCL;
if((flags & O_ACCMODE) == O_RDONLY)
myflags |= DB_RDONLY;
if (flags & O_TRUNC)
myflags |= DB_TRUNCATE;
aret = asprintf(&fn, "%s.db", db->hdb_name);
if (aret == -1) {
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
if (db_create(&d, NULL, 0) != 0) {
free(fn);
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
db->hdb_db = d;
/* From here on out always DB_close() before returning on error */
ret = _open_db(d, fn, myflags, flags, mode, &db3->lock_fd);
free(fn);
if (ret == ENOENT) {
/* try to open without .db extension */
ret = _open_db(d, db->hdb_name, myflags, flags, mode, &db3->lock_fd);
}
if (ret) {
DB_close(context, db);
krb5_set_error_message(context, ret, "opening %s: %s",
db->hdb_name, strerror(ret));
return ret;
}
#ifndef DB_CURSOR_BULK
# define DB_CURSOR_BULK 0 /* Missing with DB < 4.8 */
#endif
ret = (*d->cursor)(d, NULL, &dbc, DB_CURSOR_BULK);
if (ret) {
DB_close(context, db);
krb5_set_error_message(context, ret, "d->cursor: %s", strerror(ret));
return ret;
}
db->hdb_dbc = dbc;
if((flags & O_ACCMODE) == O_RDONLY)
ret = hdb_check_db_format(context, db);
else
ret = hdb_init_db(context, db);
if(ret == HDB_ERR_NOENTRY)
return 0;
if (ret) {
DB_close(context, db);
krb5_set_error_message(context, ret, "hdb_open: failed %s database %s",
(flags & O_ACCMODE) == O_RDONLY ?
"checking format of" : "initialize",
db->hdb_name);
}
return ret;
}
krb5_error_code
hdb_db3_create(krb5_context context, HDB **db,
const char *filename)
{
DB3_HDB **db3 = (DB3_HDB **)db;
*db3 = calloc(1, sizeof(**db3)); /* Allocate space for the larger db3 */
if (*db == NULL) {
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
(*db)->hdb_db = NULL;
(*db)->hdb_name = strdup(filename);
if ((*db)->hdb_name == NULL) {
free(*db);
*db = NULL;
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
(*db)->hdb_master_key_set = 0;
(*db)->hdb_openp = 0;
(*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
(*db)->hdb_open = DB_open;
(*db)->hdb_close = DB_close;
(*db)->hdb_fetch_kvno = _hdb_fetch_kvno;
(*db)->hdb_store = _hdb_store;
(*db)->hdb_remove = _hdb_remove;
(*db)->hdb_firstkey = DB_firstkey;
(*db)->hdb_nextkey= DB_nextkey;
(*db)->hdb_lock = DB_lock;
(*db)->hdb_unlock = DB_unlock;
(*db)->hdb_rename = DB_rename;
(*db)->hdb__get = DB__get;
(*db)->hdb__put = DB__put;
(*db)->hdb__del = DB__del;
(*db)->hdb_destroy = DB_destroy;
(*db3)->lock_fd = -1;
return 0;
}
#endif /* HAVE_DB3 */