Viewing file:  check_user_privileges.lib.php (8.51 KB) -rw-r--r--
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<?php
/* $Id: check_user_privileges.lib.php,v 1.12 2006/01/17 17:02:30 cybot_tm Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:
// Get user's global privileges and some db-specific privileges
// ($controllink and $userlink are links to MySQL defined in the "common.lib.php" library)
// Note: if no controluser is defined, $controllink contains $userlink
/**
* returns true (int > 0) if current user is superuser
* otherwise 0
*
* @return integer $is_superuser
*/
function PMA_isSuperuser() {
return PMA_DBI_try_query( 'SELECT COUNT(*) FROM mysql.user',
$GLOBALS['userlink'], PMA_DBI_QUERY_STORE );
}
$is_create_db_priv = false;
$is_process_priv = true;
$is_reload_priv = false;
$db_to_create = '';
$dbs_where_create_table_allowed = array();
// We were trying to find if user if superuser with 'USE mysql'
// but users with the global priv CREATE TEMPORARY TABLES or LOCK TABLES
// can do a 'USE mysql' (even if they cannot see the tables)
$is_superuser = PMA_isSuperuser();
function PMA_analyseShowGrant($rs_usr, &$is_create_db_priv, &$db_to_create, &$is_reload_priv, &$dbs_where_create_table_allowed) {
$re0 = '(^|(\\\\\\\\)+|[^\])'; // non-escaped wildcards
$re1 = '(^|[^\])(\\\)+'; // escaped wildcards
while ($row = PMA_DBI_fetch_row($rs_usr)) {
$show_grants_dbname = substr($row[0], strpos($row[0], ' ON ') + 4, (strpos($row[0], '.', strpos($row[0], ' ON ')) - strpos($row[0], ' ON ') - 4));
$show_grants_dbname = ereg_replace('^`(.*)`', '\\1', $show_grants_dbname);
$show_grants_str = substr($row[0], 6, (strpos($row[0], ' ON ') - 6));
if ($show_grants_str == 'RELOAD') {
$is_reload_priv = true;
}
if (($show_grants_str == 'ALL') || ($show_grants_str == 'ALL PRIVILEGES') || ($show_grants_str == 'CREATE') || strpos($show_grants_str, 'CREATE')) {
if ($show_grants_dbname == '*') {
// a global CREATE privilege
$is_create_db_priv = true;
$is_reload_priv = true;
$db_to_create = '';
$dbs_where_create_table_allowed[] = '*';
break;
} else {
// this array may contain wildcards
$dbs_where_create_table_allowed[] = $show_grants_dbname;
// before MySQL 4.1.0, we cannot use backquotes around a dbname
// for the USE command, so the USE will fail if the dbname contains
// a "-" and we cannot detect if such a db already exists;
// since 4.1.0, we need to use backquotes if the dbname contains a "-"
// in a USE command
if (PMA_MYSQL_INT_VERSION > 40100) {
$dbname_to_test = PMA_backquote($show_grants_dbname);
} else {
$dbname_to_test = $show_grants_dbname;
}
if ( (ereg($re0 . '%|_', $show_grants_dbname)
&& !ereg('\\\\%|\\\\_', $show_grants_dbname))
// does this db exist?
|| (!PMA_DBI_try_query('USE ' . ereg_replace($re1 .'(%|_)', '\\1\\3', $dbname_to_test), null, PMA_DBI_QUERY_STORE) && substr(PMA_DBI_getError(), 1, 4) != 1044)
) {
$db_to_create = ereg_replace($re0 . '%', '\\1...', ereg_replace($re0 . '_', '\\1?', $show_grants_dbname));
$db_to_create = ereg_replace($re1 . '(%|_)', '\\1\\3', $db_to_create);
$is_create_db_priv = true;
// TODO: collect $db_to_create into an array, to display a drop-down
// in the "Create new database" dialog
//
// we don't break, we want all possible databases
//break;
} // end if
} // end elseif
} // end if
} // end while
} // end function
// 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
if (PMA_MYSQL_INT_VERSION >= 40102) {
$rs_usr = PMA_DBI_try_query('SHOW GRANTS', $userlink, PMA_DBI_QUERY_STORE);
if ($rs_usr) {
PMA_analyseShowGrant($rs_usr, $is_create_db_priv, $db_to_create, $is_reload_priv, $dbs_where_create_table_allowed);
PMA_DBI_free_result($rs_usr);
unset($rs_usr);
}
} else {
// Before MySQL 4.1.2, we first try to find a priv in mysql.user. Hopefuly
// the controluser is correctly defined; but here, $controllink could contain
// $userlink so maybe the SELECT will fail
if (!$is_create_db_priv) {
$res = PMA_DBI_query('SELECT USER();', null, PMA_DBI_QUERY_STORE);
list($mysql_cur_user_and_host) = PMA_DBI_fetch_row($res);
$mysql_cur_user = substr($mysql_cur_user_and_host, 0, strrpos($mysql_cur_user_and_host, '@'));
$local_query = 'SELECT Create_priv, Reload_priv FROM mysql.user WHERE ' . PMA_convert_using('User') . ' = ' . PMA_convert_using(PMA_sqlAddslashes($mysql_cur_user), 'quoted') . ' OR ' . PMA_convert_using('User') . ' = ' . PMA_convert_using('', 'quoted') . ';';
$rs_usr = PMA_DBI_try_query($local_query, $controllink, PMA_DBI_QUERY_STORE); // Debug: or PMA_mysqlDie('', $local_query, false);
if ($rs_usr) {
while ($result_usr = PMA_DBI_fetch_assoc($rs_usr)) {
if (!$is_create_db_priv) {
$is_create_db_priv = ($result_usr['Create_priv'] == 'Y');
}
if (!$is_reload_priv) {
$is_reload_priv = ($result_usr['Reload_priv'] == 'Y');
}
} // end while
PMA_DBI_free_result($rs_usr);
unset($rs_usr, $result_usr);
if ($is_create_db_priv) {
$dbs_where_create_table_allowed[] = '*';
}
} // end if
} // end if
// If the user has Create priv on a inexistant db, show him in the dialog
// the first inexistant db name that we find, in most cases it's probably
// the one he just dropped :)
if (!$is_create_db_priv) {
$local_query = 'SELECT DISTINCT Db FROM mysql.db WHERE ' . PMA_convert_using('Create_priv') . ' = ' . PMA_convert_using('Y', 'quoted') . ' AND (' . PMA_convert_using('User') . ' = ' .PMA_convert_using(PMA_sqlAddslashes($mysql_cur_user), 'quoted') . ' OR ' . PMA_convert_using('User') . ' = ' . PMA_convert_using('', 'quoted') . ');';
$rs_usr = PMA_DBI_try_query($local_query, $controllink, PMA_DBI_QUERY_STORE);
if ($rs_usr) {
$re0 = '(^|(\\\\\\\\)+|[^\])'; // non-escaped wildcards
$re1 = '(^|[^\])(\\\)+'; // escaped wildcards
while ($row = PMA_DBI_fetch_assoc($rs_usr)) {
$dbs_where_create_table_allowed[] = $row['Db'];
if (ereg($re0 . '(%|_)', $row['Db'])
|| (!PMA_DBI_try_query('USE ' . ereg_replace($re1 . '(%|_)', '\\1\\3', $row['Db'])) && substr(PMA_DBI_getError(), 1, 4) != 1044)) {
$db_to_create = ereg_replace($re0 . '%', '\\1...', ereg_replace($re0 . '_', '\\1?', $row['Db']));
$db_to_create = ereg_replace($re1 . '(%|_)', '\\1\\3', $db_to_create);
$is_create_db_priv = true;
break;
} // end if
} // end while
PMA_DBI_free_result($rs_usr);
unset($rs_usr, $row, $re0, $re1);
} else {
// Finally, let's try to get the user's privileges by using SHOW
// GRANTS...
// Maybe we'll find a little CREATE priv there :)
$rs_usr = PMA_DBI_try_query('SHOW GRANTS FOR ' . $mysql_cur_user_and_host . ';', $controllink, PMA_DBI_QUERY_STORE);
if (!$rs_usr) {
// OK, now we'd have to guess the user's hostname, but we
// only try out the 'username'@'%' case.
$rs_usr = PMA_DBI_try_query('SHOW GRANTS FOR ' . PMA_convert_using(PMA_sqlAddslashes($mysql_cur_user), 'quoted') . ';', $controllink, PMA_DBI_QUERY_STORE);
}
unset($local_query);
if ($rs_usr) {
PMA_analyseShowGrant($rs_usr, $is_create_db_priv, $db_to_create, $is_reload_priv, $dbs_where_create_table_allowed);
PMA_DBI_free_result($rs_usr);
unset($rs_usr);
} // end if
} // end elseif
} // end if
} // end else (MySQL < 4.1.2)
// If disabled, don't show it
if (!$cfg['SuggestDBName']) {
$db_to_create = '';
}
?>
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