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POwhats wrong with this php mysql_real_escape_string
 

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  1. POwhats wrong with this php mysql_real_escape_string
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    <p><pre></p> <br /> Atomic Number Latin English Abbreviation <p>* check the variables for content */</p> <code>/*** a list of filters ***/ $filters = array( 'searchtext' =&gt; array( 'filter' =&gt; FILTER_CALLBACK, 'options' =&gt; 'mysql_real_escape_string'), 'fieldname' =&gt; array( 'filter' =&gt; FILTER_CALLBACK, 'options' =&gt; 'mysql_real_escape_string') ); /*** escape all POST variables ***/ $input = filter_input_array(INPUT_POST, $filters); /*** check the values are not empty ***/ if(empty($input['fieldname']) || empty($input['searchtext'])) { echo 'Invalid search'; } else { /*** mysql hostname ***/ $hostname = 'localhost'; /*** mysql username ***/ $username = 'username'; /*** mysql password ***/ $password = 'password'; /*** mysql database name ***/ $dbname = 'periodic_table'; /*** connect to the database ***/ $link = @mysql_connect($hostname, $username, $password); /*** check if the link is a valid resource ***/ if(is_resource($link)) { /*** select the database we wish to use ***/ if(mysql_select_db($dbname, $link) === TRUE) { /*** sql to SELECT information***/ $sql = sprintf("SELECT * FROM elements WHERE %s = '%s'", $input['fieldname'], $input['searchtext']); /*** echo the sql query ***/ echo '&lt;h3&gt;'.$sql.'&lt;/h3&gt;'; /*** run the query ***/ $result = mysql_query($sql); /*** check if the result is a valid resource ***/ if(is_resource($result)) { /*** check if we have more than zero rows ***/ if(mysql_num_rows($result) !== 0) { echo '&lt;table&gt;'; while($row=mysql_fetch_array($result)) { echo '&lt;tr&gt; &lt;td&gt;'.$row['atomicnumber'].'&lt;/td&gt; &lt;td&gt;'.$row['latin'].'&lt;/td&gt; &lt;td&gt;'.$row['english'].'&lt;/td&gt; &lt;td&gt;'.$row['abbr'].'&lt;/td&gt; &lt;/tr&gt;'; } echo '&lt;/table&gt;'; } else { /*** if zero results are found.. ***/ echo 'Zero results found'; } } else { /*** if the resource is not valid ***/ 'No valid resource found'; } } /*** if we are unable to select the database show an error ****/ else { echo 'Unable to select database '.$dbname; } /*** close the connection ***/ mysql_close($link); } else { /*** if we fail to connect ***/ echo 'Unable to connect'; } } } </code></pre> <p>else { echo 'Please Choose An Element'; } ?> </p> <p>I got this code from phppro.org tutorials site and i tried to run it. It gives Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: A link to the server could not be established. .... Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: Access denied for user 'ODBC'@'localhost' (using password: NO)....</p> <p>I went to php.net and look it up "Note: A MySQL connection is required before using mysql_real_escape_string() otherwise an error of level E_WARNING is generated, and FALSE is returned. If link_identifier isn't defined, the last MySQL connection is used."</p> <p>My questions are: 1-why they put single quotation around mysql_real_escape_string ? 2-They should establish a connection first, then use the $filter array statement with mysql_real_escape_string ?</p>
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    1. COSQL injection detected
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      1. USYour Common Sense
    2. CO@Col.Shrapnel: Nope, the whole filter\_input\_array() thingy is supposed to invoke real\_escape\_string on each element of \_POST and store the result in $input. _If_ it worked as intended there would be no sql injection vulnerability.
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    3. CO@VolkerK So what? real_escape_string is not a magic spell that makes you "safe".
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