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  * @uses    $_SESSION['is_create_db_priv'] for caching
  34  * @uses    $_SESSION['is_process_priv'] for caching
  35  * @uses    $_SESSION['is_reload_priv'] for caching
  36  * @uses    $_SESSION['db_to_create'] for caching
  37  * @uses    $_SESSION['dbs_where_create_table_allowed'] for caching
  38  * @uses    $GLOBALS['is_create_db_priv'] to set it
  39  * @uses    $GLOBALS['is_process_priv'] to set it
  40  * @uses    $GLOBALS['is_reload_priv'] to set it
  41  * @uses    $GLOBALS['db_to_create'] to set it
  42  * @uses    $GLOBALS['dbs_where_create_table_allowed'] to set it
  43  * @uses    $GLOBALS['server']
  44  * @uses    PMA_DBI_try_query()
  45  * @uses    PMA_DBI_fetch_row()
  46  * @uses    PMA_DBI_free_result()
  47  * @uses    PMA_DBI_getError()
  48  * @uses    PMA_unQuote()
  49  * @uses    PMA_backquote()
  50  * @uses    preg_match()
  51  * @uses    preg_replace()
  52  * @uses    substr()
  53  * @uses    strpos()
  54  */
  55 function PMA_analyseShowGrant()
  56 {
  57     if (PMA_cacheExists('is_create_db_priv', true)) {
  58         $GLOBALS['is_create_db_priv']  = PMA_cacheGet('is_create_db_priv', true);
  59         $GLOBALS['is_process_priv']    = PMA_cacheGet('is_process_priv', true);
  60         $GLOBALS['is_reload_priv']     = PMA_cacheGet('is_reload_priv', true);
  61         $GLOBALS['db_to_create']       = PMA_cacheGet('db_to_create', true);
  62         $GLOBALS['dbs_where_create_table_allowed']
  63             = PMA_cacheGet('dbs_where_create_table_allowed', true);
  64         return;
  65     }
  66
  67     // defaults
  68     $GLOBALS['is_create_db_priv']  = false;
  69     $GLOBALS['is_process_priv']    = true;
  70     $GLOBALS['is_reload_priv']     = false;
  71     $GLOBALS['db_to_create']       = '';
  72     $GLOBALS['dbs_where_create_table_allowed'] = array();
  73
  74     $rs_usr = PMA_DBI_try_query('SHOW GRANTS');
  75
  76     if (! $rs_usr) {
  77         return;
  78     }
  79
  80     $re0 = '(^|(\\\\\\\\)+|[^\\\\])'; // non-escaped wildcards
  81     $re1 = '(^|[^\\\\])(\\\)+'; // escaped wildcards
  82
  83     while ($row = PMA_DBI_fetch_row($rs_usr)) {
  84         // extract db from GRANT ... ON *.* or GRANT ... ON db.*
  85         $db_name_offset = strpos($row[0], ' ON ') + 4;
  86         $show_grants_dbname = substr($row[0],
  87             $db_name_offset,
  88             strpos($row[0], '.', $db_name_offset) - $db_name_offset);
  89         $show_grants_dbname = PMA_unQuote($show_grants_dbname, '`');
  90
  91         $show_grants_str    = substr($row[0], 6, (strpos($row[0], ' ON ') - 6));
  92         if ($show_grants_str == 'RELOAD') {
  93             $GLOBALS['is_reload_priv'] = true;
  94         }
  95
  96         /**
  97          * @todo if we find CREATE VIEW but not CREATE, do not offer
  98          * the create database dialog box
  99          */
 100         if ($show_grants_str == 'ALL'
 101          || $show_grants_str == 'ALL PRIVILEGES'
 102          || $show_grants_str == 'CREATE'
 103          || strpos($show_grants_str, 'CREATE,') !== false) {
 104             if ($show_grants_dbname == '*') {
 105                 // a global CREATE privilege
 106                 $GLOBALS['is_create_db_priv'] = true;
 107                 $GLOBALS['is_reload_priv'] = true;
 108                 $GLOBALS['db_to_create']   = '';
 109                 $GLOBALS['dbs_where_create_table_allowed'][] = '*';
 110                 // @todo we should not break here, cause GRANT ALL *.*
 111                 // could be revoked by a later rule like GRANT SELECT ON db.*
 112                 break;
 113             } else {
 114                 // this array may contain wildcards
 115                 $GLOBALS['dbs_where_create_table_allowed'][] = $show_grants_dbname;
 116
 117                 $dbname_to_test = PMA_backquote($show_grants_dbname);
 118
 119                 if ($GLOBALS['is_create_db_priv']) {
 120                     // no need for any more tests if we already know this
 121                     continue;
 122                 }
 123
 124                 if ((preg_match('/' . $re0 . '%|_/', $show_grants_dbname)
 125                   && ! preg_match('/\\\\%|\\\\_/', $show_grants_dbname))
 126                  // does this db exist?
 127                  || (! PMA_DBI_try_query('USE ' .  preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $dbname_to_test))
 128                   && substr(PMA_DBI_getError(), 1, 4) != 1044)
 129                 ) {
 130                     if ($GLOBALS['cfg']['SuggestDBName']) {
 131                         $GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '_/',     '\\1?',   $show_grants_dbname);
 132                         $GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '%/',     '\\1...', $GLOBALS['db_to_create']);
 133                         $GLOBALS['db_to_create'] = preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $GLOBALS['db_to_create']);
 134                     }
 135                     $GLOBALS['is_create_db_priv'] = true;
 136
 137                     /**
 138                      * @todo collect $GLOBALS['db_to_create'] into an array, to display a
 139                      * drop-down in the "Create database" dialog
 140                      */
 141                      // we don't break, we want all possible databases
 142                      //break;
 143                 } // end if
 144             } // end elseif
 145         } // end if
 146     } // end while
 147
 148     PMA_DBI_free_result($rs_usr);
 149
 150     // must also PMA_cacheUnset() them in libraries/auth/cookie.auth.lib.php
 151     PMA_cacheSet('is_create_db_priv', $GLOBALS['is_create_db_priv'], true);
 152     PMA_cacheSet('is_process_priv', $GLOBALS['is_process_priv'], true);
 153     PMA_cacheSet('is_reload_priv', $GLOBALS['is_reload_priv'], true);
 154     PMA_cacheSet('db_to_create', $GLOBALS['db_to_create'], true);
 155     PMA_cacheSet('dbs_where_create_table_allowed', $GLOBALS['dbs_where_create_table_allowed'], true);
 156 } // end function
 157
 158 PMA_analyseShowGrant();
 159
 160 ?>