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