phpmyadmin/libraries/check_user_privileges.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * Get user's global privileges and some db-specific privileges
   5  *
   6  * @package PhpMyAdmin
   7  */
   8 if (! defined('PHPMYADMIN')) {
   9     exit;
  10 }
  11
  12 /**
  13  *
  14  */
  15 $GLOBALS['is_superuser'] = PMA_isSuperuser();
  16
  17 /**
  18  * sets privilege information extracted from SHOW GRANTS result
  19  *
  20  * Detection for some CREATE privilege.
  21  *
  22  * Since MySQL 4.1.2, we can easily detect current user's grants using $userlink
  23  * (no control user needed) and we don't have to try any other method for
  24  * detection
  25  *
  26  * @todo fix to get really all privileges, not only explicitly defined for this user
  27  * from MySQL manual: (http://dev.mysql.com/doc/refman/5.0/en/show-grants.html)
  28  * SHOW GRANTS displays only the privileges granted explicitly to the named
  29  * account. Other privileges might be available to the account, but they are not
  30  * displayed. For example, if an anonymous account exists, the named account
  31  * might be able to use its privileges, but SHOW GRANTS will not display them.
  32  *
  33  * @return void
  34  */
  35 function PMA_analyseShowGrant()
  36 {
  37     if (PMA_Util::cacheExists('is_create_db_priv', true)) {
  38         $GLOBALS['is_create_db_priv']  = PMA_Util::cacheGet('is_create_db_priv', true);
  39         $GLOBALS['is_process_priv']    = PMA_Util::cacheGet('is_process_priv', true);
  40         $GLOBALS['is_reload_priv']     = PMA_Util::cacheGet('is_reload_priv', true);
  41         $GLOBALS['db_to_create']       = PMA_Util::cacheGet('db_to_create', true);
  42         $GLOBALS['dbs_where_create_table_allowed']
  43             = PMA_Util::cacheGet('dbs_where_create_table_allowed', true);
  44         return;
  45     }
  46
  47     // defaults
  48     $GLOBALS['is_create_db_priv']  = false;
  49     $GLOBALS['is_process_priv']    = true;
  50     $GLOBALS['is_reload_priv']     = false;
  51     $GLOBALS['db_to_create']       = '';
  52     $GLOBALS['dbs_where_create_table_allowed'] = array();
  53
  54     $rs_usr = PMA_DBI_try_query('SHOW GRANTS');
  55
  56     if (! $rs_usr) {
  57         return;
  58     }
  59
  60     $re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
  61     $re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
  62
  63     while ($row = PMA_DBI_fetch_row($rs_usr)) {
  64         // extract db from GRANT ... ON *.* or GRANT ... ON db.*
  65         $db_name_offset = strpos($row[0], ' ON ') + 4;
  66         $show_grants_dbname = substr(
  67             $row[0], $db_name_offset,
  68             strpos($row[0], '.', $db_name_offset) - $db_name_offset
  69         );
  70         $show_grants_dbname
  71             = PMA_Util::unQuote($show_grants_dbname, '`');
  72
  73         $show_grants_str    = substr($row[0], 6, (strpos($row[0], ' ON ') - 6));
  74         if ($show_grants_str == 'RELOAD') {
  75             $GLOBALS['is_reload_priv'] = true;
  76         }
  77
  78         /**
  79          * @todo if we find CREATE VIEW but not CREATE, do not offer
  80          * the create database dialog box
  81          */
  82         if ($show_grants_str == 'ALL'
  83             || $show_grants_str == 'ALL PRIVILEGES'
  84             || $show_grants_str == 'CREATE'
  85             || strpos($show_grants_str, 'CREATE,') !== false
  86         ) {
  87             if ($show_grants_dbname == '*') {
  88                 // a global CREATE privilege
  89                 $GLOBALS['is_create_db_priv'] = true;
  90                 $GLOBALS['is_reload_priv'] = true;
  91                 $GLOBALS['db_to_create']   = '';
  92                 $GLOBALS['dbs_where_create_table_allowed'][] = '*';
  93                 // @todo we should not break here, cause GRANT ALL *.*
  94                 // could be revoked by a later rule like GRANT SELECT ON db.*
  95                 break;
  96             } else {
  97                 // this array may contain wildcards
  98                 $GLOBALS['dbs_where_create_table_allowed'][] = $show_grants_dbname;
  99
 100                 $dbname_to_test = PMA_Util::backquote($show_grants_dbname);
 101
 102                 if ($GLOBALS['is_create_db_priv']) {
 103                     // no need for any more tests if we already know this
 104                     continue;
 105                 }
 106
 107                 // does this db exist?
 108                 if ((preg_match('/' . $re0 . '%|_/', $show_grants_dbname)
 109                     && ! preg_match('/\\\\%|\\\\_/', $show_grants_dbname))
 110                     || (! PMA_DBI_try_query('USE ' .  preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $dbname_to_test))
 111                     && substr(PMA_DBI_getError(), 1, 4) != 1044)
 112                 ) {
 113                     /**
 114                      * Do not handle the underscore wildcard
 115                      * (this case must be rare anyway)
 116                      */
 117                     $GLOBALS['db_to_create'] = preg_replace(
 118                         '/' . $re0 . '%/',     '\\1...',
 119                         $show_grants_dbname
 120                     );
 121                     $GLOBALS['db_to_create'] = preg_replace(
 122                         '/' . $re1 . '(%|_)/', '\\1\\3',
 123                         $GLOBALS['db_to_create']
 124                     );
 125                     $GLOBALS['is_create_db_priv'] = true;
 126
 127                     /**
 128                      * @todo collect $GLOBALS['db_to_create'] into an array,
 129                      * to display a drop-down in the "Create database" dialog
 130                      */
 131                      // we don't break, we want all possible databases
 132                      //break;
 133                 } // end if
 134             } // end elseif
 135         } // end if
 136     } // end while
 137
 138     PMA_DBI_free_result($rs_usr);
 139
 140     // must also cacheUnset() them in
 141     // libraries/plugins/auth/AuthenticationCookie.class.php
 142     PMA_Util::cacheSet('is_create_db_priv', $GLOBALS['is_create_db_priv'], true);
 143     PMA_Util::cacheSet('is_process_priv', $GLOBALS['is_process_priv'], true);
 144     PMA_Util::cacheSet('is_reload_priv', $GLOBALS['is_reload_priv'], true);
 145     PMA_Util::cacheSet('db_to_create', $GLOBALS['db_to_create'], true);
 146     PMA_Util::cacheSet(
 147         'dbs_where_create_table_allowed',
 148         $GLOBALS['dbs_where_create_table_allowed'],
 149         true
 150     );
 151 } // end function
 152
 153 if (!PMA_DRIZZLE) {
 154     PMA_analyseShowGrant();
 155 } else {
 156     // todo: for simple_user_policy only database with user's login can be created
 157     // (unless logged in as root)
 158     $GLOBALS['is_create_db_priv'] = $GLOBALS['is_superuser'];
 159     $GLOBALS['is_process_priv']   = false;
 160     $GLOBALS['is_reload_priv']    = false;
 161     $GLOBALS['db_to_create']      = '';
 162     $GLOBALS['dbs_where_create_table_allowed'] = array('*');
 163 }
 164
 165 ?>