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Bug #53035 finfo_file() returns incorrect mimetype
Submitted: 2010-10-10 13:37 UTC Modified: 2013-11-15 11:10 UTC
Votes:17
Avg. Score:4.2 ± 0.8
Reproduced:17 of 17 (100.0%)
Same Version:9 (52.9%)
Same OS:5 (29.4%)
From: stuart at horuskol dot net Assigned:
Status: Not a bug Package: Filesystem function related
PHP Version: Irrelevant OS: Linux/Ubuntu 10.04
Private report: No CVE-ID: None
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From: stuart at horuskol dot net
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 [2010-10-10 13:37 UTC] stuart at horuskol dot net 
Description:
------------
This is tested on:
PHP 5.3.2-1ubuntu4.5 with Suhosin-Patch (cli) (built: Sep 17 2010 13:49:46)

file_info() is reporting a CSS file has having the mimetype 'text/x-c' instead of 'text/css'

however, the command line tool 'mimetype' correctly identifies the file using the same library at '/usr/share/misc/magic'

the file being tested is available at http://horuskol.net/reset.css

Test script:
---------------
PHP:

$finfo = new finfo(FILEINFO_MIME);
var_dump($finfo->file('/path/to/file/reset.css'));

$finfo = new finfo(FILEINFO_MIME, '/usr/share/misc/magic');
var_dump($finfo->file('/path/to/file/reset.css'));

$finfo = finfo_open(FILEINFO_MIME, '/usr/share/misc/magic');
var_dump(finfo_file($finfo, '/path/to/file/reset.css'));


Command Line:

mimetype -DM --database /usr/share/misc/magic /path/to/file/reset.css

Expected result:
----------------
string(26) "text/css; charset=us-ascii"

Actual result:
--------------
string(26) "text/x-c; charset=us-ascii"

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Pull Requests

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 [2010-10-11 15:39 UTC] felipe@php.net 
Strange... It's caused by the comment in the begin of the CSS file.
 [2010-10-12 07:52 UTC] aharvey@php.net
-Status: Open +Status: Bogus
 [2010-10-12 07:52 UTC] aharvey@php.net 
I get the same result from the command line "file" program on Ubuntu 10.10:

$ curl -s http://horuskol.net/reset.css | file --mime-type -
/dev/stdin: text/x-c

mimetype also believes it's C source:

$ mimetype -DM reset.css 
> Data dirs are: /home/aharvey/.local/share, /usr/share/gnome, /usr/local/share, /usr/share
> Checking all magic rules
> Value "/*" at offset 2 matches at /usr/share/mime/magic line 1136
reset.css: text/x-csrc

The only way I can get mimetype to return text/css is if it also looks at the extension (ie is called without -M).

I can't really see any way this is a PHP bug, given other programs using the same magic database are resulting in the same file being detected as C source. Closing.
 [2010-10-13 00:38 UTC] stuart at horuskol dot net 
"however, the command line tool 'mimetype' correctly identifies the file using the same library at '/usr/share/misc/magic'"

I tested using the -M switch (as in my example/test script):

mimetype -DM --database /usr/share/misc/magic /path/to/file/reset.css

and this tells me the file is text/css on my platform - are you sure you're using the same magic database?
 [2010-11-09 16:57 UTC] stephane at emark dot nl 
Hi, I just want to say that I experience the same problem.

As felipe@php.net mentionned, if you have any type of comments at the top of your 
file, the problem occurs. 
For example, if i try to get the mime type of a js file with comments at the top, 
it returns "text/x-c", if i remove the comments, then it returns "text/plain", 
which in and of itself is not correct as it should return 'text/javascript'.

Any idea how to circumvent this problem other than removing all my comments ?!?!
 [2011-07-06 19:27 UTC] shawn at thesignchef dot com 
I am having the same issue still. Has this been fixed or is there a workaround. Thanks so much.
 [2011-12-12 12:06 UTC] n dot delargy at ctidigital dot com 
I've also had this issue, using ZF Zend_Validate_File_MimeType a text/plain file (according to file -i /path/to/file.txt) is incorrectly identified as text/x-c in ubuntu 11.10
 [2011-12-12 12:08 UTC] n dot delargy at ctidigital dot com 
It may also be worth noting that the file was converted from an excel sheet to a text tab delimited and charset was us-ascii
 [2012-09-29 11:00 UTC] DonJaime at donjaime dot de 
This problem occurs with no comment at the start of the file, too.

Rather than giving up because "other programs using the same magic database are resulting in the same file being detected as C source" it might be worth putting in the extra few lines of code required to return the right mime type on the basis of the file extension, if it exists. Worldwide, this would save a lot of energy and frustration.
 [2012-09-30 17:13 UTC] pajoye@php.net
-Status: Not a bug +Status: Feedback
 [2012-09-30 17:13 UTC] pajoye@php.net 
Please try using this snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/
 [2012-11-29 14:34 UTC] stepan dot stepanov at gmail dot com 
The problem still exists (PHP 5.3.19)

If i have csv file with names (e.g.) it is recognised as text/plan (that is expected)

But when i have someone called 'charles' or 'charlotte' inside - my file is recognised as text/x-c (obviously dues to word 'char')
 [2013-01-17 23:03 UTC] a dot lecca at gmail dot com 
On PHP 5.3.18
Keven will also trigger a text/x-asm mime type

Also, confirming the Charlotte issue
 [2013-02-18 00:34 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
 [2013-02-25 14:59 UTC] stepan dot stepanov at gmail dot com 
Command line "file" programm shows the right result. Though php reports wrong one.
CentOS release 5.8

See details below:

$ file -i char2.csv
char2.csv: text/plain; charset=us-ascii
$ file -i char.csv
char.csv: text/plain; charset=us-ascii
$ php -f mimetest.php
char2.csv: text/plain
char.cvs: text/x-c
$ diff -u char2.csv char.csv
--- char2.csv   2012-10-10 15:07:05.000000000 +0200
+++ char.csv    2013-02-25 15:47:38.000000000 +0100
@@ -1,3 +1,4 @@
 stepan.stepanov@somewhere.com
 stepan.stepanov@somewhereelse.com
+charlotte@server.com
 herr.totalscheisse@mime.typ

----------------------------------------------------------

$ php -v
PHP 5.3.19 (cli) (built: Nov 25 2012 13:17:45)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies
    with Xdebug v2.1.3, Copyright (c) 2002-2012, by Derick Rethans
$ cat mimetest.php
<?
$finfo = new finfo(FILEINFO_MIME_TYPE);

echo "\nchar2.csv: ".$finfo->file('char2.csv');
echo "\nchar.cvs: ".$finfo->file('char.csv');
?>
 [2013-02-25 15:55 UTC] pajoye@php.net 
Which version do you use on this system?

We may need to update the bundled database or library.
 [2013-02-25 15:55 UTC] pajoye@php.net
-Status: No Feedback +Status: Feedback
 [2013-02-25 15:57 UTC] stepan dot stepanov at gmail dot com 
Do you mean version of PHP ?

PHP 5.3.19 (cli)
 [2013-02-25 18:37 UTC] pajoye@php.net 
no, I meant the file/fileinfo library on your system. "file" and php does not 
share the same version.
 [2013-02-26 16:48 UTC] stepan dot stepanov at gmail dot com 
PHP fileinfo library = 1.0.5-dev
 [2013-03-25 17:56 UTC] stepan dot stepanov at gmail dot com 
Is this bug stil alive ?
Does it have any change to be fixed ?

We really need it to filter uploaded files, obviously for security reasons.

Should we switch to "file" command of OS or make it sence to wait for a fix ?
 [2013-05-01 20:55 UTC] chuck at manchuck dot com 
We noticed that this bug is present in php 5.4.10 on windows.  We do not have the 
Suhosin-Patch installed:

PHP 5.4.10 (cli) (built: Dec 19 2012 20:33:35)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
    with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans

We also have the problem when a csv file is uploaded with Seven starting a line
 [2013-10-15 11:54 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 [2013-11-14 10:10 UTC] max451f at gmail dot com 
Experienced same problem.

PHP 5.5.3-1ubuntu2 (cli) (built: Oct  9 2013 14:49:12) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
    with Zend OPcache v7.0.3-dev, Copyright (c) 1999-2013, by Zend Technologies
    with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans

Linux  3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 07:38:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
 [2013-11-15 11:10 UTC] pajoye@php.net
-Status: No Feedback +Status: Not a bug
 [2013-11-15 11:10 UTC] pajoye@php.net 
Wrong mime types can only fixed by either:

. using the latest PHP version and compile it yourself so the bundled mimetype database will be used
. Be sure you updated the info package (on ubuntu in your case)

However I a mo not sure which version they use on Debian or ubuntu.

In any case it is not a bug in the php code per se.

Let close this bug. Please keep in mind that it is really not a php bug but a definition matching issue, which is being done using the DB.
 
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