Viewing file:  CheckUserPrivileges.php (11.58 KB) -rw-r--r--
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Get user's global privileges and some db-specific privileges
*
* @package PhpMyAdmin
*/
namespace PhpMyAdmin;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Util;
/**
* PhpMyAdmin\CheckUserPrivileges class
*
* @package PhpMyAdmin
*/
class CheckUserPrivileges
{
/**
* @var DatabaseInterface
*/
private $dbi;
/**
* Constructor
*
* @param DatabaseInterface $dbi DatabaseInterface object
*/
public function __construct(DatabaseInterface $dbi)
{
$this->dbi = $dbi;
}
/**
* Extracts details from a result row of a SHOW GRANT query
*
* @param string $row grant row
*
* @return array
*/
public function getItemsFromShowGrantsRow($row)
{
$db_name_offset = mb_strpos($row, ' ON ') + 4;
$tblname_end_offset = mb_strpos($row, ' TO ');
$tblname_start_offset = false;
if ($__tblname_start_offset = mb_strpos($row, '`.', $db_name_offset)) {
if ($__tblname_start_offset < $tblname_end_offset) {
$tblname_start_offset = $__tblname_start_offset + 1;
}
}
if (!$tblname_start_offset) {
$tblname_start_offset = mb_strpos($row, '.', $db_name_offset);
}
$show_grants_dbname = mb_substr(
$row,
$db_name_offset,
$tblname_start_offset - $db_name_offset
);
$show_grants_dbname = Util::unQuote($show_grants_dbname, '`');
$show_grants_str = mb_substr(
$row,
6,
(mb_strpos($row, ' ON ') - 6)
);
$show_grants_tblname = mb_substr(
$row,
$tblname_start_offset + 1,
$tblname_end_offset - $tblname_start_offset - 1
);
$show_grants_tblname = Util::unQuote($show_grants_tblname, '`');
return array(
$show_grants_str,
$show_grants_dbname,
$show_grants_tblname
);
}
/**
* Check if user has required privileges for
* performing 'Adjust privileges' operations
*
* @param string $show_grants_str string containing grants for user
* @param string $show_grants_dbname name of db extracted from grant string
* @param string $show_grants_tblname name of table extracted from grant string
*
* @return void
*/
public function checkRequiredPrivilegesForAdjust(
$show_grants_str,
$show_grants_dbname,
$show_grants_tblname
) {
// '... ALL PRIVILEGES ON *.* ...' OR '... ALL PRIVILEGES ON `mysql`.* ..'
// OR
// SELECT, INSERT, UPDATE, DELETE .... ON *.* OR `mysql`.*
if ($show_grants_str == 'ALL'
|| $show_grants_str == 'ALL PRIVILEGES'
|| (mb_strpos(
$show_grants_str, 'SELECT, INSERT, UPDATE, DELETE'
) !== false)
) {
if ($show_grants_dbname == '*'
&& $show_grants_tblname == '*'
) {
$GLOBALS['col_priv'] = true;
$GLOBALS['db_priv'] = true;
$GLOBALS['proc_priv'] = true;
$GLOBALS['table_priv'] = true;
if ($show_grants_str == 'ALL PRIVILEGES'
|| $show_grants_str == 'ALL'
) {
$GLOBALS['is_reload_priv'] = true;
}
}
// check for specific tables in `mysql` db
// Ex. '... ALL PRIVILEGES on `mysql`.`columns_priv` .. '
if ($show_grants_dbname == 'mysql') {
switch ($show_grants_tblname) {
case "columns_priv":
$GLOBALS['col_priv'] = true;
break;
case "db":
$GLOBALS['db_priv'] = true;
break;
case "procs_priv":
$GLOBALS['proc_priv'] = true;
break;
case "tables_priv":
$GLOBALS['table_priv'] = true;
break;
case "*":
$GLOBALS['col_priv'] = true;
$GLOBALS['db_priv'] = true;
$GLOBALS['proc_priv'] = true;
$GLOBALS['table_priv'] = true;
break;
default:
}
}
}
}
/**
* sets privilege information extracted from SHOW GRANTS result
*
* Detection for some CREATE privilege.
*
* Since MySQL 4.1.2, we can easily detect current user's grants using $userlink
* (no control user needed) and we don't have to try any other method for
* detection
*
* @todo fix to get really all privileges, not only explicitly defined for this user
* from MySQL manual: (https://dev.mysql.com/doc/refman/5.0/en/show-grants.html)
* SHOW GRANTS displays only the privileges granted explicitly to the named
* account. Other privileges might be available to the account, but they are not
* displayed. For example, if an anonymous account exists, the named account
* might be able to use its privileges, but SHOW GRANTS will not display them.
*
* @return void
*/
public function analyseShowGrant()
{
if (Util::cacheExists('is_create_db_priv')) {
$GLOBALS['is_create_db_priv'] = Util::cacheGet(
'is_create_db_priv'
);
$GLOBALS['is_reload_priv'] = Util::cacheGet(
'is_reload_priv'
);
$GLOBALS['db_to_create'] = Util::cacheGet(
'db_to_create'
);
$GLOBALS['dbs_where_create_table_allowed'] = Util::cacheGet(
'dbs_where_create_table_allowed'
);
$GLOBALS['dbs_to_test'] = Util::cacheGet(
'dbs_to_test'
);
$GLOBALS['db_priv'] = Util::cacheGet(
'db_priv'
);
$GLOBALS['col_priv'] = Util::cacheGet(
'col_priv'
);
$GLOBALS['table_priv'] = Util::cacheGet(
'table_priv'
);
$GLOBALS['proc_priv'] = Util::cacheGet(
'proc_priv'
);
return;
}
// defaults
$GLOBALS['is_create_db_priv'] = false;
$GLOBALS['is_reload_priv'] = false;
$GLOBALS['db_to_create'] = '';
$GLOBALS['dbs_where_create_table_allowed'] = array();
$GLOBALS['dbs_to_test'] = $this->dbi->getSystemSchemas();
$GLOBALS['proc_priv'] = false;
$GLOBALS['db_priv'] = false;
$GLOBALS['col_priv'] = false;
$GLOBALS['table_priv'] = false;
$rs_usr = $this->dbi->tryQuery('SHOW GRANTS');
if (! $rs_usr) {
return;
}
$re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
$re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
while ($row = $this->dbi->fetchRow($rs_usr)) {
list(
$show_grants_str,
$show_grants_dbname,
$show_grants_tblname
) = $this->getItemsFromShowGrantsRow($row[0]);
if ($show_grants_dbname == '*') {
if ($show_grants_str != 'USAGE') {
$GLOBALS['dbs_to_test'] = false;
}
} elseif ($GLOBALS['dbs_to_test'] !== false) {
$GLOBALS['dbs_to_test'][] = $show_grants_dbname;
}
if (
mb_strpos($show_grants_str,'RELOAD') !== false
) {
$GLOBALS['is_reload_priv'] = true;
}
// check for the required privileges for adjust
$this->checkRequiredPrivilegesForAdjust(
$show_grants_str,
$show_grants_dbname,
$show_grants_tblname
);
/**
* @todo if we find CREATE VIEW but not CREATE, do not offer
* the create database dialog box
*/
if ($show_grants_str == 'ALL'
|| $show_grants_str == 'ALL PRIVILEGES'
|| $show_grants_str == 'CREATE'
|| strpos($show_grants_str, 'CREATE,') !== false
) {
if ($show_grants_dbname == '*') {
// a global CREATE privilege
$GLOBALS['is_create_db_priv'] = true;
$GLOBALS['is_reload_priv'] = true;
$GLOBALS['db_to_create'] = '';
$GLOBALS['dbs_where_create_table_allowed'][] = '*';
// @todo we should not break here, cause GRANT ALL *.*
// could be revoked by a later rule like GRANT SELECT ON db.*
break;
} else {
// this array may contain wildcards
$GLOBALS['dbs_where_create_table_allowed'][] = $show_grants_dbname;
$dbname_to_test = Util::backquote($show_grants_dbname);
if ($GLOBALS['is_create_db_priv']) {
// no need for any more tests if we already know this
continue;
}
// does this db exist?
if ((preg_match('/' . $re0 . '%|_/', $show_grants_dbname)
&& ! preg_match('/\\\\%|\\\\_/', $show_grants_dbname))
|| (! $this->dbi->tryQuery(
'USE ' . preg_replace(
'/' . $re1 . '(%|_)/', '\\1\\3', $dbname_to_test
)
)
&& mb_substr($this->dbi->getError(), 1, 4) != 1044)
) {
/**
* Do not handle the underscore wildcard
* (this case must be rare anyway)
*/
$GLOBALS['db_to_create'] = preg_replace(
'/' . $re0 . '%/', '\\1',
$show_grants_dbname
);
$GLOBALS['db_to_create'] = preg_replace(
'/' . $re1 . '(%|_)/', '\\1\\3',
$GLOBALS['db_to_create']
);
$GLOBALS['is_create_db_priv'] = true;
/**
* @todo collect $GLOBALS['db_to_create'] into an array,
* to display a drop-down in the "Create database" dialog
*/
// we don't break, we want all possible databases
//break;
} // end if
} // end elseif
} // end if
} // end while
$this->dbi->freeResult($rs_usr);
// must also cacheUnset() them in
// PhpMyAdmin\Plugins\Auth\AuthenticationCookie
Util::cacheSet('is_create_db_priv', $GLOBALS['is_create_db_priv']);
Util::cacheSet('is_reload_priv', $GLOBALS['is_reload_priv']);
Util::cacheSet('db_to_create', $GLOBALS['db_to_create']);
Util::cacheSet(
'dbs_where_create_table_allowed',
$GLOBALS['dbs_where_create_table_allowed']
);
Util::cacheSet('dbs_to_test', $GLOBALS['dbs_to_test']);
Util::cacheSet('proc_priv', $GLOBALS['proc_priv']);
Util::cacheSet('table_priv', $GLOBALS['table_priv']);
Util::cacheSet('col_priv', $GLOBALS['col_priv']);
Util::cacheSet('db_priv', $GLOBALS['db_priv']);
} // end function
}
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