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Re: is mysqli_real_escape_string bullet proof with binary data? [message #182341 is a reply to message #182340]

Mon, 29 July 2013 00:46

Jerry Stuckle
Messages: 2598
Registered: September 2010

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Senior Member

On 7/28/2013 3:16 PM, Luuk wrote:
> On 28-07-2013 21:05, Jerry Stuckle wrote:
>> On 7/28/2013 11:25 AM, Luuk wrote:
>>> On 28-07-2013 15:39, Jerry Stuckle wrote:
>>>> On 7/28/2013 8:54 AM, Luuk wrote:
>>>> >>>> ..and hope that the file 'upArrow.png' does not contain a ['] or
>>>> >>>> three?
>>>> >>>>
>>>> >>>
>>>> >>> luuk@opensuse:~/public_html/temp> grep "'" upArrow.png
>>>> >>> Binary file upArrow.png matches
>>>> >>>
>>>> >>> luuk@opensuse:~/public_html/temp> hexdump -C upArrow.png | grep "'"
>>>> >>> 00000110 53 00 a0 04 00 60 cb 63 62 e3 00 50 2d 00 60 27
>>>> >>> |S....`.cb..P-.`'|
>>>> >>> 00000260 00 b0 6a 3e 01 7b 91 2d a8 5d 63 03 f6 4b 27 10
>>>> >>> |..j>.{.-.]c..K'.|
>>>> >>> 000003a0 51 c2 27 22 93 a8 4b b4 26 ba 11 f9 c4 18 62 32
>>>> >>> |Q.'"..K.&.....b2|
>>>> >>> 000003c0 37 24 12 89 43 32 27 b9 90 02 49 b1 a4 54 d2 12
>>>> >>> |7$..C2'...I..T..|
>>>> >>> 00000530 fb 81 0e 41 c7 4a 27 5c 27 47 67 8f ce 05 9d e7
>>>> >>> |...A.J'\'Gg.....|
>>>> >>> 00000720 0e 85 50 7e e8 d6 d0 07 61 e6 61 8b c3 7e 0c 27
>>>> >>> |..P~....a.a..~.'|
>>>> >>> 000007c0 91 bc 35 79 24 c5 33 a5 2c e5 b9 84 27 a9 90 bc
>>>> >>> |..5y$.3.,...'...|
>>>> >>> 000009e0 dd bd f3 7a 6f f7 c5 f7 f5 df 16 dd 7e 72 27 fd
>>>> >>> |...zo.......~r'.|
>>>> >>> 000009f0 ce cb bb d9 77 27 ee ad bc 4f bc 5f f4 40 ed 41
>>>> >>> |....w'...O._.@.A|
>>>> >>>
>>>> >>>
>>>>
>>>> It doesn't make any difference. The png could contain one or more
>>>> delimiters, i.e. an apostrophe, which will cause a syntax error in a
>>>> non-prepared statement.
>>>
>>> It DOES contain single-quotes (that is an apostophe?).
>>> and that DOES NOT cause a syntax error,
>>> because i'm using a prepared statement.
>>>
>>>>
>>>> Escaping strings is not just to prevent security leeks - it is also to
>>>> ensure valid SQL.
>>>>
>>>
>>> I dont see any errors in the query.log or error.log of my MySQL
>>> installation (about updating this `testpng`-table).
>>> Therefore i dont see a point in ensuring validity of an already valid
>>> SQL.
>>>
>>> Can you give an example an file that would break my script?
>>> The script is here: http://pastebin.com/5D8ZGEhy
>>> My emailadress is: luuk34(at)gmail(dot)com
>>>
>>> I think i have shown that this script is working OK, and that there is
>>> no reason to do something with escaping string here.
>>>
>>
>> You're not reading my replies, Luuk. I said if it contains delimiters
>> and YOU ARE NOT USING PREPARED STATEMENTS. For instance:
>>
>> "INSERT INTO MyTABLE (bin_column) VALUES ('$png_data');
>>
>> Prepared statements are good for some things - but you have to also be
>> aware of the additional processing required when you use them.
>>
>>
>
> From my code (at: http://pastebin.com/5D8ZGEhy):
> $stmt = $link->prepare("INSERT INTO testpng (image) VALUES (?)");
> $file = file_get_contents('upArrow.png');
> echo "Size before: ".strlen($file)."<br>\n";
> $stmt->bind_param('s', $file);
>
> Is above not a prepared statment?
>

Luuk, yes it is. But READ WHAT I'VE BEEN SAYING!

I NEVER SAID YOU WERE NOT USING PREPARED STATEMENTS!

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 09:31
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 09:45
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 11:08
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 13:28
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 14:36
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 15:22
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 15:34
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 23:44
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sun, 28 July 2013 12:54
		Re: is mysqli_real_escape_string bullet proof with binary data? By: J.O. Aho on Sun, 28 July 2013 13:35
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sun, 28 July 2013 13:39
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sun, 28 July 2013 15:25
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sun, 28 July 2013 19:05
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sun, 28 July 2013 19:16
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Mon, 29 July 2013 00:46
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Daniel Pitts on Mon, 29 July 2013 16:17
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Mon, 29 July 2013 18:01
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Mon, 29 July 2013 23:04
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Tue, 30 July 2013 01:02
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Mon, 29 July 2013 18:34
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 13:52
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 13:58
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 14:36
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 14:43
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Pierre Jaury on Sat, 27 July 2013 18:10
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 23:52
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Denis McMahon on Sat, 27 July 2013 18:38
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Pierre Jaury on Sat, 27 July 2013 20:25
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sat, 27 July 2013 20:59
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 23:50
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sun, 28 July 2013 15:44
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Pierre Jaury on Sun, 28 July 2013 16:01
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sun, 28 July 2013 16:43
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Sun, 28 July 2013 18:31
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sun, 28 July 2013 16:39
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Pierre Jaury on Sun, 28 July 2013 17:56
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sun, 28 July 2013 18:14
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sun, 28 July 2013 19:10
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Norman Peelman on Mon, 29 July 2013 01:13
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 23:46
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 23:56
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Pierre Jaury on Sun, 28 July 2013 01:55
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sun, 28 July 2013 02:11
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 23:58
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Norman Peelman on Sat, 27 July 2013 13:35
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 13:56
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Norman Peelman on Sun, 28 July 2013 00:01
		Re: is mysqli_real_escape_string bullet proof with binary data? By: The Natural Philosoph on Sat, 27 July 2013 14:33
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Sat, 27 July 2013 13:57
		I've always used GD, but never been 100% happy with it (Was: is mysqli_real_escape_string bullet proof with binary data?) By: J.O. Aho on Sat, 27 July 2013 16:09
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Luuk on Mon, 29 July 2013 18:37
		Re: is mysqli_real_escape_string bullet proof with binary data? By: J.O. Aho on Tue, 30 July 2013 05:31
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Tue, 30 July 2013 06:08
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Scott Johnson on Tue, 30 July 2013 12:35
		Re: is mysqli_real_escape_string bullet proof with binary data? By: J.O. Aho on Tue, 30 July 2013 15:53
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Jerry Stuckle on Tue, 30 July 2013 16:37
		Re: is mysqli_real_escape_string bullet proof with binary data? By: tony on Tue, 30 July 2013 09:35
		Re: is mysqli_real_escape_string bullet proof with binary data? By: Denis McMahon on Wed, 31 July 2013 04:56

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