get_loaded_extensions
Re: php at kaiundina dot de (03-Feb-2005 02:18)
1. magic_quotes_gpc=on/off and magic_quotes_sybase=on/off
I made test and your function worked right.
These were the <input ... /> names I used:
name="a"
name="b.b b\b"
name="c[c.1]"
name="c[c 2]"
name="c[c\3]"
name="c.c c[c.' 4]"
name="c ' c[c"4]"
name="d"[d"1]"
(I used " because I don't know other way to put " into the name)
and the user-input value:
a ' " \ \' \" \\ a
2. > 17) The chars '.', ' ' are always replaced by '_' when used in keys.
This is true only for the top-level keys, such as "b.b b\b", "c.c c" and "c ' c" above. The second-level key "[c.' 4]" was not changed to [c_'_4] but was escaped acording to how magic_quites_XXX are set.
Tested on PHP 4.4.0.
These magic_quotes are really black magic :(
It'll be good to make test against $_SESSION, but I can't do it today.
get_magic_quotes_gpc
(PHP 4, PHP 5)
get_magic_quotes_gpc — Gets the current configuration setting of magic quotes gpc
Description
int get_magic_quotes_gpc ( void )Returns the current configuration setting of magic_quotes_gpc
Keep in mind that the setting magic_quotes_gpc will not work at runtime.
For more information about magic_quotes, see this security section.
Return Values
Returns 0 if magic quotes gpc are off, 1 otherwise.
Examples
Example 1795. get_magic_quotes_gpc() example
<?php
echo get_magic_quotes_gpc(); // 1
echo $_POST['lastname']; // O\'reilly
echo addslashes($_POST['lastname']); // O\\\'reilly
if (!get_magic_quotes_gpc()) {
$lastname = addslashes($_POST['lastname']);
} else {
$lastname = $_POST['lastname'];
}
echo $lastname; // O\'reilly
$sql = "INSERT INTO lastnames (lastname) VALUES ('$lastname')";
?>
Notes
Note: If the directive magic_quotes_sybase is ON it will completely override magic_quotes_gpc. So even when get_magic_quotes_gpc() returns TRUE neither double quotes, backslashes or NUL's will be escaped. Only single quotes will be escaped. In this case they'll look like: ''
See Also
| addslashes() |
| stripslashes() |
| get_magic_quotes_runtime() |
| ini_get() |
add a note
User Contributed Notesget_magic_quotes_gpc
slonmron_no_spam_please_ at yahoo dot com
06-Dec-2006 02:32
06-Dec-2006 02:32
venimus at gmail dot com
11-Jul-2006 01:14
11-Jul-2006 01:14
When you work with forms and databases you should use this concept:
1.When inserting the user input in DB escape $_POST/$_GET with add_slashes() or similar (to match the speciffic database escape rules)
$query='INSERT INTO users SET fullname="'.add_slashes($_POST['fullname']).'"';
insert_into_db($query);
2.When reading a previously submitted input from DB use html_special_chars to display an escaped result!
read_db_row('SELECT fullname FROM users');
echo '<input type="text" name="fullname" value="'.html_special_chars($db_row['fullname']).'" />
this way you safely store and work with the original(unescaped) data.
07-Feb-2006 12:56
All the code listed on this page is not necessary if you use the php_flag directive in a .htaccess file. This allows you to disable magic quotes completely, without the need to adjust your php.ini file or (re)process the user's input.
Just take a look at http://www.php.net/manual/en/security.magicquotes.php#55935
Gist of his note: in the .htaccess file, add a line
php_flag magic_quotes_gpc off
That's it. Thank you very much, richard dot spindler :) !
php at kaiundina dot de
03-Feb-2005 12:18
03-Feb-2005 12:18
Escaping of key-strings in GPC-arrays behave different to the escaping of their values.
First I expected that keys in submitted gpc-arrays are never escaped.
Anyway. After I saw escaped keys, I assumed they're escaped according to the settings of magic quotes.
... it's even worse...
It took me over 2 days of testing to figure out the exact behavior and creating two functions (one for each php-version) that strips slashes reliably from any array submitted to a script. Hope this saves someones time and nerves.
The following is true for $_GET- and $_POST-arrays. I hope other arrays affected by magic quotes behave equally.
I did not test the behavior for cases where magic_quotes_sybase is set.
== legend for possible case combinations ==
Px = php version we're using
P4 = php 4.3.9
P5 = php 5.0.2
MQ = MagicQuotes GPC
+MQ = magic quotes enabled
-MQ = magic quotes disabled
TL = TopLevel key
+TL = key is on top level (i.e. $_GET['myKey'])
-TL = key is nested within another array (i.e. $_GET['myList']['myKey'])
AK = ArrayKey
+AK = the value of the key is another array (i.e. is_array($_GET['myKey']) == true)
-AK = the value is a normal string (i.e. is_string($_GET['myKey']) == true)
== legend for possible results ==
KE = KeyEscaping
+KE = control chars are prefixed with a backslash
-KE = key is returned as submitted and needn't to be stripped
VE = ValueEscaping (doesn't apply for array as value)
+VE = control chars are prefixed with a backslash
-VE = value is returned as submitted and needn't to be stripped
== here we go - the following rules apply ==
1) P4 +MQ +AK +TL --> -KE
2) P4 +MQ +AK -TL --> +KE
3) P4 +MQ -AK +TL --> -KE +VE
4) P4 +MQ -AK -TL --> +KE +VE
5) P4 -MQ +AK +TL --> -KE
6) P4 -MQ +AK -TL --> -KE
7) P4 -MQ -AK +TL --> -KE -VE
8) P4 -MQ -AK -TL --> -KE -VE
9) P5 +MQ +AK +TL --> -KE
10) P5 +MQ +AK -TL --> +KE
11) P5 +MQ -AK +TL --> +KE +VE
12) P5 +MQ -AK -TL --> +KE +VE
13) P5 -MQ +AK +TL --> -KE
14) P5 -MQ +AK -TL --> -KE
15) P5 -MQ -AK +TL --> +KE -VE
16) P5 -MQ -AK -TL --> +KE -VE
17) The chars '.', ' ' are always replaced by '_' when used in keys.
Example (rule 15):
When running under php 5.0.2 having magic quotes disabled, gpc-keys on top level containing strings are escaped while their associated values are not.
== The following function will strip GPC-arrays for php 4.3.9 ==
function transcribe($aList, $aIsTopLevel = true) {
$gpcList = array();
$isMagic = get_magic_quotes_gpc();
foreach ($aList as $key => $value) {
$decodedKey = ($isMagic && !$aIsTopLevel)?stripslashes($key):$key;
if (is_array($value)) {
$decodedValue = transcribe($value, false);
} else {
$decodedValue = ($isMagic)?stripslashes($value):$value;
}
$gpcList[$decodedKey] = $decodedValue;
}
return $gpcList;
}
== The following function will strip GPC-arrays for php 5.0.2 ==
function transcribe($aList, $aIsTopLevel = true) {
$gpcList = array();
$isMagic = get_magic_quotes_gpc();
foreach ($aList as $key => $value) {
if (is_array($value)) {
$decodedKey = ($isMagic && !$aIsTopLevel)?stripslashes($key):$key;
$decodedValue = transcribe($value, false);
} else {
$decodedKey = stripslashes($key);
$decodedValue = ($isMagic)?stripslashes($value):$value;
}
$gpcList[$decodedKey] = $decodedValue;
}
return $gpcList;
}
Usage:
$unstrippedGET = transcribe($_GET);
$unstrippedPOST = transcribe($_POST);
Maybe someone is willing to test those combinations for other php-versions and with magic_quotes_sybase set to 'on' - let me know.
Sorry for this huge amount of text, but its complete. I was unable to compress the the decision table more than this.
stpierre-at-spamsucks.nebrwesleyan.edu
14-Jan-2005 04:51
14-Jan-2005 04:51
I've found that, when working with Oracle (9i at least), you'll want to turn on magic_quotes_sybase. I've read elsewhere that others have had the same experience.
eltehaem at poczta dot onet dot pl
26-Nov-2004 10:58
26-Nov-2004 10:58
Please note, that when magic_quotes_gpc is set not only $_POST, $_GET, $_REQUEST, $_COOKIE arrays values are slashed. Actually every string value in $GLOBALS array is slashed, ie. $GLOBALS['_SERVER']['PATH_INFO'] (or $_SERVER['PATH_INFO']).