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User Contributed Notes 29 notes
CertaiN ¶
10 years ago
You'd better check $_FILES structure and values throughly.
The following code cannot cause any errors absolutely.
Example:
<?php
header('Content-Type: text/plain; charset=utf-8');
try {
// Undefined | Multiple Files | $_FILES Corruption Attack
// If this request falls under any of them, treat it invalid.
if (
!isset($_FILES['upfile']['error']) ||
is_array($_FILES['upfile']['error'])
) {
throw new RuntimeException('Invalid parameters.');
}
// Check $_FILES['upfile']['error'] value.
switch ($_FILES['upfile']['error']) {
case UPLOAD_ERR_OK:
break;
case UPLOAD_ERR_NO_FILE:
throw new RuntimeException('No file sent.');
case UPLOAD_ERR_INI_SIZE:
case UPLOAD_ERR_FORM_SIZE:
throw new RuntimeException('Exceeded filesize limit.');
default:
throw new RuntimeException('Unknown errors.');
}
// You should also check filesize here.
if ($_FILES['upfile']['size'] > 1000000) {
throw new RuntimeException('Exceeded filesize limit.');
}
// DO NOT TRUST $_FILES['upfile']['mime'] VALUE !!
// Check MIME Type by yourself.
$finfo = new finfo(FILEINFO_MIME_TYPE);
if (false === $ext = array_search(
$finfo->file($_FILES['upfile']['tmp_name']),
array(
'jpg' => 'image/jpeg',
'png' => 'image/png',
'gif' => 'image/gif',
),
true
)) {
throw new RuntimeException('Invalid file format.');
}
// You should name it uniquely.
// DO NOT USE $_FILES['upfile']['name'] WITHOUT ANY VALIDATION !!
// On this example, obtain safe unique name from its binary data.
if (!move_uploaded_file(
$_FILES['upfile']['tmp_name'],
sprintf('./uploads/%s.%s',
sha1_file($_FILES['upfile']['tmp_name']),
$ext
)
)) {
throw new RuntimeException('Failed to move uploaded file.');
}
echo 'File is uploaded successfully.';
} catch (RuntimeException $e) {
echo $e->getMessage();
}
?>
steve dot criddle at crd-sector dot com ¶
20 years ago
IE on the Mac is a bit troublesome. If you are uploading a file with an unknown file suffix, IE uploads the file with a mime type of "application/x-macbinary". The resulting file includes the resource fork wrapped around the file. Not terribly useful.
The following code assumes that the mime type is in $type, and that you have loaded the file's contents into $content. If the file is in MacBinary format, it delves into the resource fork header, gets the length of the data fork (bytes 83-86) and uses that to get rid of the resource fork.
(There is probably a better way to do it, but this solved my problem):
<?php
if ($type == 'application/x-macbinary') {
if (strlen($content) < 128) die('File too small');
$length = 0;
for ($i=83; $i<=86; $i++) {
$length = ($length * 256) + ord(substr($content,$i,1));
}
$content = substr($content,128,$length);
}
?>
~caetin~ ( at ) ~hotpop~ ( dot ) ~com~ ¶
20 years ago
From the manual:
If no file is selected for upload in your form, PHP will return $_FILES['userfile']['size'] as 0, and $_FILES['userfile']['tmp_name'] as none.
As of PHP 4.2.0, the "none" is no longer a reliable determinant of no file uploaded. It's documented if you click on the "error codes" link, but you need to look at the $_FILES['your_file']['error']. If it's 4, then no file was selected.
am at netactor dot NO_SPAN dot com ¶
22 years ago
Your binary files may be uploaded incorrectly if you use modules what recode characters. For example, for Russian Apache, you should use
<Files ScriptThatReceivesUploads.php>
CharsetDisable On
</Files>
jan at lanteraudio dot nl ¶
11 years ago
Also stumbled on the max_file_size problem, in particular getting no response, no error whatsoever when uploading a file bigger than the set upload_max_filesize.
I found that it's not the upload_max_filesize setting, but instead the post_max_size setting causing this no response issue. So if you set post_max_size way larger than upload_max_filesize, at least you are likely to get an error response when filesize exceeds upload_max_filesize but is still within the limits of post_max_size.
Hope this helps anyone.
myko AT blue needle DOT com ¶
19 years ago
Just a quick note that there's an issue with Apache, the MAX_FILE_SIZE hidden form field, and zlib.output_compression = On. Seems that the browser continues to post up the entire file, even though PHP throws the MAX_FILE_SIZE error properly. Turning zlib compression to OFF seems to solve the issue. Don't have time to dig in and see who's at fault, but wanted to save others the hassle of banging their head on this one.
ceo at l-i-e dot com ¶
19 years ago
Using /var/www/uploads in the example code is just criminal, imnsho.
One should *NOT* upload untrusted files into your web tree, on any server.
Nor should any directory within your web tree have permissions sufficient for an upload to succeed, on a shared server. Any other user on that shared server could write a PHP script to dump anything they want in there!
The $_FILES['userfile']['type'] is essentially USELESS.
A. Browsers aren't consistent in their mime-types, so you'll never catch all the possible combinations of types for any given file format.
B. It can be forged, so it's crappy security anyway.
One's code should INSPECT the actual file to see if it looks kosher.
For example, images can quickly and easily be run through imagegetsize and you at least know the first N bytes LOOK like an image. That doesn't guarantee it's a valid image, but it makes it much less likely to be a workable security breaching file.
For Un*x based servers, one could use exec and 'file' command to see if the Operating System thinks the internal contents seem consistent with the data type you expect.
I've had trouble in the past with reading the '/tmp' file in a file upload. It would be nice if PHP let me read that file BEFORE I tried to move_uploaded_file on it, but PHP won't, presumably under the assumption that I'd be doing something dangerous to read an untrusted file. Fine. One should move the uploaded file to some staging directory. Then you check out its contents as thoroughly as you can. THEN, if it seems kosher, move it into a directory outside your web tree. Any access to that file should be through a PHP script which reads the file. Putting it into your web tree, even with all the checks you can think of, is just too dangerous, imnsho.
There are more than a few User Contributed notes here with naive (bad) advice. Be wary.
info at levaravel dot com ¶
15 years ago
A little codesnippet which returns a filesize in a more legible format.
<?php
function display_filesize($filesize){
if(is_numeric($filesize)){
$decr = 1024; $step = 0;
$prefix = array('Byte','KB','MB','GB','TB','PB');
while(($filesize / $decr) > 0.9){
$filesize = $filesize / $decr;
$step++;
}
return round($filesize,2).' '.$prefix[$step];
} else {
return 'NaN';
}
}
?>
david at cygnet dot be ¶
18 years ago
If you are experiencing problems posting files from Internet Explorer to a PHP script over an SSL connection, for instance "Page can not be displayed" or empty $_FILES and $_POST arrays (described by jason 10-Jan-2006 02:08), then check out this microsoft knowledgebase article:
http://support.microsoft.com/?kbid=889334
This knowledgebase article explains how since service pack 2 there may be problems posting from IE over SSL. It is worth checking whether your problem is IE specific since this is definitely not a PHP problem!
jedi_aka at yahoo dot com ¶
18 years ago
For those of you trying to make the upload work with IIS on windows XP/2000/XP Media and alike here is a quick todo.
1) Once you have created subdirectories "uploads/" in the same directory wher you code is running use the code from oportocala above and to make absolutely sure sure that the file you are trying to right is written under that folder. ( I recomend printing it using echo $uploadfile; )
2) In windows explorer browse to the upload directory created above and share it. To do that execute the following substeps.
a) Right click the folder click "sharing and security..."
b) Check 'Share this folder on the network'
c) Check 'Allow network users to change my files' ( THIS STEP IS VERY IMPORTANT )
d) click 'ok' or 'apply'
3) you can then go in the IIS to set read and write permissions for it. To do that execute the followin substeps.
a) Open IIS (Start/Controp Panel (classic View)/ Admistrative tools/Internet Information Service
b) Browse to your folder (the one we created above)
c) right click and select properties.
d) in the Directory tab, make sure, READ, WRITE, AND DIRECTORY BROWSING are checked.
e) For the security freaks out there, You should also make sure that 'execute permissions:' are set to Script only or lower (DO NOT SET IT TO 'script and executable)'( that is because someone could upload a script to your directory and run it. And, boy, you do not want that to happen).
there U go.
Send me feed back it if worked for you or not so that I can update the todo.
jedi_aka@yahoo.com
PS: BIG thanks to oportocala
xmontero at dsitelecom dot com ¶
12 years ago
If "large files" (ie: 50 or 100 MB) fail, check this:
It may happen that your outgoing connection to the server is slow, and it may timeout not the "execution time" but the "input time", which for example in our system defaulted to 60s. In our case a large upload could take 1 or 2 hours.
Additionally we had "session settings" that should be preserved after upload.
1) You might want review those ini entries:
* session.gc_maxlifetime
* max_input_time
* max_execution_time
* upload_max_filesize
* post_max_size
2) Still fails? Caution, not all are changeable from the script itself. ini_set() might fail to override.
More info here:
http://www.php.net/manual/es/ini.list.php
You can see that the "upload_max_filesize", among others, is PHP_INI_PERDIR and not PHP_INI_ALL. This invalidates to use ini_set():
http://www.php.net/manual/en/configuration.changes.modes.php
Use .htaccess instead.
3) Still fails?. Just make sure you enabled ".htaccess" to overwrite your php settings. This is made in the apache file. You need at least AllowOverride Options.
See this here:
http://www.php.net/manual/en/configuration.changes.php
You will necessarily allow this manually in the case your master files come with AllowOverride None.
Conclussion:
Depending on the system, to allow "large file uploads" you must go up and up and up and touch your config necessarily up to the apache config.
Sample files:
These work for me, for 100MB uploads, lasting 2 hours:
In apache-virtual-host:
-----------------------------------------------------------
<Directory /var/www/MyProgram>
AllowOverride Options
</Directory>
-----------------------------------------------------------
In .htaccess:
-----------------------------------------------------------
php_value session.gc_maxlifetime 10800
php_value max_input_time 10800
php_value max_execution_time 10800
php_value upload_max_filesize 110M
php_value post_max_size 120M
-----------------------------------------------------------
In the example,
- As I last 1 to 2 hours, I allow 3 hours (3600x3)
- As I need 100MB, I allow air above for the file (110M) and a bit more for the whole post (120M).
svenr at selfhtml dot org ¶
17 years ago
Clarification on the MAX_FILE_SIZE hidden form field:
PHP has the somewhat strange feature of checking multiple "maximum file sizes".
The two widely known limits are the php.ini settings "post_max_size" and "upload_max_size", which in combination impose a hard limit on the maximum amount of data that can be received.
In addition to this PHP somehow got implemented a soft limit feature. It checks the existance of a form field names "max_file_size" (upper case is also OK), which should contain an integer with the maximum number of bytes allowed. If the uploaded file is bigger than the integer in this field, PHP disallows this upload and presents an error code in the $_FILES-Array.
The PHP documentation also makes (or made - see bug #40387 - http://bugs.php.net/bug.php?id=40387) vague references to "allows browsers to check the file size before uploading". This, however, is not true and has never been. Up til today there has never been a RFC proposing the usage of such named form field, nor has there been a browser actually checking its existance or content, or preventing anything. The PHP documentation implies that a browser may alert the user that his upload is too big - this is simply wrong.
Please note that using this PHP feature is not a good idea. A form field can easily be changed by the client. If you have to check the size of a file, do it conventionally within your script, using a script-defined integer, not an arbitrary number you got from the HTTP client (which always must be mistrusted from a security standpoint).
Rob ¶
16 years ago
You should not have any directories within your website root that has the permissions required for file upload. If you are going to do a file upload, I recommend you use the PHP FTP Functions in conjunction with your file field, that way the files are transferred to a remote FTP location separate from your server.
keith at phpdiary dot org ¶
19 years ago
Caution: *DO NOT* trust $_FILES['userfile']['type'] to verify the uploaded filetype; if you do so your server could be compromised. I'll show you why below:
The manual (if you scroll above) states: $_FILES['userfile']['type'] - The mime type of the file, if the browser provided this information. An example would be "image/gif".
Be reminded that this mime type can easily be faked as PHP doesn't go very far in verifying whether it really is what the end user reported!
So, someone could upload a nasty .php script as an "image/gif" and execute the url to the "image".
My best bet would be for you to check the extension of the file and using exif_imagetype() to check for valid images. Many people have suggested the use of getimagesize() which returns an array if the file is indeed an image and false otherwise, but exif_imagetype() is much faster. (the manual says it so)
damien from valex ¶
15 years ago
This is simpler method of checking for too much POST data (alternative to that by v3 from sonic-world.ru).
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST' && empty($_POST) && $_SERVER['CONTENT_LENGTH'] > 0) {
throw new Exception(sprintf('The server was unable to handle that much POST data (%s bytes) due to its current configuration', $_SERVER['CONTENT_LENGTH']));
}
?>
geert dot php at myrosoft dot com ¶
18 years ago
When file names do contain single quote parts of the filename are being lost.
eg.: uploading a filename
startName 'middlepart' endName.txt
will be uploaded (and hence stored in the _Files ['userfile'] variable as
endName.txt
skipping everything before the second single quote.
robpet at tds dot net ¶
19 years ago
People have remarked that incorrect permissions on the upload directory may prevent photos or other files from uploading. Setting the Apache owner of the directory incorrectly will also prevent files from uploading -- I use a PHP script that creates a directory (if it doesn't exist already) before placing an uploaded file into it. When the script creates the directory and then copies the uploaded file into the directory there is no problem because the owner of the file is whatever Apache is running as, typically "nobody". However, lets say that I've moved the site to a new server and have copied over existing file directories using FTP. In this case the owner will have a different name from the Apache owner and files will not upload. The solution is to TelNet into the site and reset the owner to "nobody" or whatever Apache is running as using the CHOWN command.
Thomas ¶
12 years ago
MIME type can be faked.
VVV
$_FILES['userfile']['type']
The mime type of the file, if the browser provided this information. An example would be "image/gif". This mime type is however not checked on the PHP side and therefore don't take its value for granted.
http://www.php.net/manual/en/features.file-upload.post-method.php
[Editor's note: removed a reference to a deleted note, and edited the note to make sense by itself.]
rnagavel at yahoo dot com dot au ¶
16 years ago
If $_FILES is always empty, check the method of your form.
It should be POST. Default method of a form is GET.
<form action="myaction.php">
<input type="file" name"userfile">
</form>
File will not be uploaded as default method of the form is GET.
<form action="myaction.php" method="POST">
<input type="file" name"userfile">
</form>
Files will be uploaded and $_FILES will be populated.
Tyfud ¶
19 years ago
It's important to note that when using the move_uploaded_file() command, that some configurations (Especially IIS) will fail if you prefix the destination path with a leading "/". Try the following:
<?php move_uploaded_file($tmpFileName,'uploads/'.$fileName); ?>
Setting up permissions is also a must. Make sure all accounts have write access to your upload directory, and read access if you wish to view these files later. You might have to chmod() the directory or file afterwards as well if you're still getting access errors.
olijon, iceland ¶
20 years ago
When uploading large images, I got a "Document contains no data" error when using Netscape and an error page when using Explorer. My server setup is RH Linux 9, Apache 2 and PHP 4.3.
I found out that the following entry in the httpd.conf file was missing:
<Files *.php>
SetOutputFilter PHP
SetInputFilter PHP
LimitRequestBody 524288 (max size in bytes)
</Files>
When this had been added, everything worked smoothly.
- Oli Jon, Iceland
warwickbarnes at yahoo dot co dot uk ¶
19 years ago
You may come across the following problem using PHP on Microsoft IIS: getting permission denied errors from the move_uploaded_file function even when all the folder permissions seem correct. I had to set the following to get it to work:
1. Write permissions on the the folder through the IIS management console.
2. Write permissions to IUSR_'server' in the folder's security settings.
3. Write permissions to "Domain Users" in the folder's security settings.
The third setting was required because my application itself lives in a secure folder - using authentication (either Basic or Windows Integrated) to identify the users. When the uploads happen IIS seems to be checking that these users have write access to the folder, not just whether the web server (IUSR_'server') has access.
Also, remember to set "Execute Permissions" to "None" in the IIS management console, so that people can't upload a script file and then run it. (Other checks of the uploaded file are recommended as well but 'Execute None' is a good start.)
therhinoman at hotmail dot com ¶
20 years ago
If your upload script is meant only for uploading images, you can use the image function getimagesize() (does not require the GD image library) to make sure you're really getting an image and also filter image types.
<?php getimagesize($file); ?>
...will return false if the file is not an image or is not accessable, otherwise it will return an array...
<?php
$file = 'somefile.jpg';
# assuming you've already taken some other
# preventive measures such as checking file
# extensions...
$result_array = getimagesize($file);
if ($result_array !== false) {
$mime_type = $result_array['mime'];
switch($mime_type) {
case "image/jpeg":
echo "file is jpeg type";
break;
case "image/gif":
echo "file is gif type";
break;
default:
echo "file is an image, but not of gif or jpeg type";
}
} else {
echo "file is not a valid image file";
}
?>
using this function along with others mentioned on this page, image ploading can be made pretty much fool-proof.
See http://php.net/manual/en/function.getimagesize.php for supported image types and more info.
maya_gomez ~ at ~ mail ~ dot ~ ru ¶
20 years ago
when you upload the file, $_FILES['file']['name'] contains its original name converted into server's default charset.
if a name contain characters that aren't present in default charset, the conversion fails and the $_FILES['file']['name'] remains in original charset.
i've got this behavior when uploading from a windows-1251 environment into koi8-r. if a filename has the number sign "?" (0xb9), it DOES NOT GET CONVERTED as soon as there is no such character in koi8-r.
Workaround i use:
<?php
if (strstr ($_FILES['file']['name'], chr(0xb9)) != "")
{
$_FILES['file']['name'] = iconv (
"windows-1251",
"koi8-r",
str_replace (chr(0xb9), "N.", $_FILES['file']['name']));
};
?>