StackOverflow2013

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plurals

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19214855
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2013-10-06T22:44:08.027
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2013-10-08T04:32:12.617
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2013-10-08T04:32:12.617
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1301487
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19214710
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2
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text
Body
It is so important that new programmers learn to do username/password authentication properly I felt it necessary to write this longer post. Firstly, as eicto pointed out, the mysql extension is both deprecated and should really not even be used ever. So to the metal. visit php.net and learn about <a href="http://ca1.php.net/pdo" rel="nofollow">PDO</a> Never store unencoded passwords. here is what you should do: set up PDO: <pre><code>// you need to store $link somewhere. in a class preferrably function InitPDO(&$link) { // havet the database handle all strings as UTF-8. $options = array('PDO::MYSQL_ATTR_INIT_COMMAND' => 'set names utf8'); $link = new PDO ( 'mysql:host='.$config['dsn_host'].';dbname='.$config['dsn_db'], $config['username'], $config['password'], $options ) ; // If there is an error executing database queries, have PDO to throw an exception. $link->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $link->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); } </code></pre> upon registration of user. <pre><code>function RegisterUser($username, $password, $company) { // hash the pwd $hpwd = hash('sha256',$password); $q ='insert into users values(username, password, company) values(?,?,?)'; $stmt = $link->prepare($q); $stmt->execute(array( $username, $hpwd, $company)); } </code></pre> // validate user and return the company if successfull <pre><code>function ValidateUser($username, $password, &$company) { $hpwd = hash('sha256',$password); $q ='select company from users where username=? AND password=?'; $stmt = $link->prepare($q); $stmt->execute(array( $username, $hpwd)); if( ($company = $stmt->fetch(PDO::FETCH_COLUMN)) === false ) { $company = 'invalid'; // because user auth failed'; } //else all is good } </code></pre> example test usage. <pre><code>// assumes there is a 'login.php' and a 'invalid.php' file $link = null; InitPDO( $link ); RegisterUser('tester','password','login'); VerifyUser('tester','password', $redir ); if( file_exists( $redir . '.php' ) ) { header( 'Location: '. $redir . '.php' ); exit; } echo 'error. no valid page found to fullfill query'; </code></pre>
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1. This table or related slice is empty.
PostParentId
1. POUsing a variable to direct traffic
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PostTypePostTypeId
1. PTAnswer
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1. USSassafras_wot
UserOwnerUserId
1. USSassafras_wot
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. This table or related slice is empty.
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