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