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  */
  34 function PMA_analyseShowGrant()
  35 {
  36     if (PMA_cacheExists('is_create_db_priv', true)) {
  37         $GLOBALS['is_create_db_priv']  = PMA_cacheGet('is_create_db_priv', true);
  38         $GLOBALS['is_process_priv']    = PMA_cacheGet('is_process_priv', true);
  39         $GLOBALS['is_reload_priv']     = PMA_cacheGet('is_reload_priv', true);
  40         $GLOBALS['db_to_create']       = PMA_cacheGet('db_to_create', true);
  41         $GLOBALS['dbs_where_create_table_allowed']
  42             = PMA_cacheGet('dbs_where_create_table_allowed', true);
  43         return;
  44     }
  45
  46     // defaults
  47     $GLOBALS['is_create_db_priv']  = false;
  48     $GLOBALS['is_process_priv']    = true;
  49     $GLOBALS['is_reload_priv']     = false;
  50     $GLOBALS['db_to_create']       = '';
  51     $GLOBALS['dbs_where_create_table_allowed'] = array();
  52
  53     $rs_usr = PMA_DBI_try_query('SHOW GRANTS');
  54
  55     if (! $rs_usr) {
  56         return;
  57     }
  58
  59     $re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
  60     $re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
  61
  62     while ($row = PMA_DBI_fetch_row($rs_usr)) {
  63         // extract db from GRANT ... ON *.* or GRANT ... ON db.*
  64         $db_name_offset = strpos($row[0], ' ON ') + 4;
  65         $show_grants_dbname = substr($row[0],
  66             $db_name_offset,
  67             strpos($row[0], '.', $db_name_offset) - $db_name_offset);
  68         $show_grants_dbname = PMA_unQuote($show_grants_dbname, '`');
  69
  70         $show_grants_str    = substr($row[0], 6, (strpos($row[0], ' ON ') - 6));
  71         if ($show_grants_str == 'RELOAD') {
  72             $GLOBALS['is_reload_priv'] = true;
  73         }
  74
  75         /**
  76          * @todo if we find CREATE VIEW but not CREATE, do not offer
  77          * the create database dialog box
  78          */
  79         if ($show_grants_str == 'ALL'
  80          || $show_grants_str == 'ALL PRIVILEGES'
  81          || $show_grants_str == 'CREATE'
  82          || strpos($show_grants_str, 'CREATE,') !== false) {
  83             if ($show_grants_dbname == '*') {
  84                 // a global CREATE privilege
  85                 $GLOBALS['is_create_db_priv'] = true;
  86                 $GLOBALS['is_reload_priv'] = true;
  87                 $GLOBALS['db_to_create']   = '';
  88                 $GLOBALS['dbs_where_create_table_allowed'][] = '*';
  89                 // @todo we should not break here, cause GRANT ALL *.*
  90                 // could be revoked by a later rule like GRANT SELECT ON db.*
  91                 break;
  92             } else {
  93                 // this array may contain wildcards
  94                 $GLOBALS['dbs_where_create_table_allowed'][] = $show_grants_dbname;
  95
  96                 $dbname_to_test = PMA_backquote($show_grants_dbname);
  97
  98                 if ($GLOBALS['is_create_db_priv']) {
  99                     // no need for any more tests if we already know this
 100                     continue;
 101                 }
 102
 103                 if ((preg_match('/' . $re0 . '%|_/', $show_grants_dbname)
 104                   && ! preg_match('/\\\\%|\\\\_/', $show_grants_dbname))
 105                  // does this db exist?
 106                  || (! PMA_DBI_try_query('USE ' .  preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $dbname_to_test))
 107                   && substr(PMA_DBI_getError(), 1, 4) != 1044)
 108                 ) {
 109                     if ($GLOBALS['cfg']['SuggestDBName']) {
 110                         /**
 111                          * Do not handle the underscore wildcard
 112                          * (this case must be rare anyway)
 113                          */
 114                         $GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '%/',     '\\1...', $show_grants_dbname);
 115                         $GLOBALS['db_to_create'] = preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $GLOBALS['db_to_create']);
 116                     }
 117                     $GLOBALS['is_create_db_priv'] = true;
 118
 119                     /**
 120                      * @todo collect $GLOBALS['db_to_create'] into an array, to display a
 121                      * drop-down in the "Create database" dialog
 122                      */
 123                      // we don't break, we want all possible databases
 124                      //break;
 125                 } // end if
 126             } // end elseif
 127         } // end if
 128     } // end while
 129
 130     PMA_DBI_free_result($rs_usr);
 131
 132     // must also PMA_cacheUnset() them in libraries/auth/cookie.auth.lib.php
 133     PMA_cacheSet('is_create_db_priv', $GLOBALS['is_create_db_priv'], true);
 134     PMA_cacheSet('is_process_priv', $GLOBALS['is_process_priv'], true);
 135     PMA_cacheSet('is_reload_priv', $GLOBALS['is_reload_priv'], true);
 136     PMA_cacheSet('db_to_create', $GLOBALS['db_to_create'], true);
 137     PMA_cacheSet('dbs_where_create_table_allowed', $GLOBALS['dbs_where_create_table_allowed'], true);
 138 } // end function
 139
 140 if (!PMA_DRIZZLE) {
 141     PMA_analyseShowGrant();
 142 } else {
 143     // todo: for simple_user_policy only database with user's login can be created (unless logged in as root)
 144     $GLOBALS['is_create_db_priv'] = $GLOBALS['is_superuser'];
 145     $GLOBALS['is_process_priv']   = false;
 146     $GLOBALS['is_reload_priv']    = false;
 147     $GLOBALS['db_to_create']      = '';
 148     $GLOBALS['dbs_where_create_table_allowed'] = array('*');
 149 }
 150
 151 ?>