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  #1  
Old June 26th, 2003, 11:13 AM
hearn hearn is offline
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Finding MAC Address

Does anyone know of a way to find a client's MAC address via PHP or Perl?

Thanks in advance for any help!

Cheers

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  #2  
Old June 26th, 2003, 11:24 AM
digitallysmooth digitallysmooth is offline
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You are not going to be able to find a client's MAC address remotely through scripting unfortunately.

May I ask why you want to get the MAC address.
If you think you are requesting a unique ID, MAC addresses are not as unique as you might think they are. A MAC address can easily be changed and/or spoofed.
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  #3  
Old June 26th, 2003, 12:03 PM
hearn hearn is offline
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Quote:
Originally posted by laidbak
You are not going to be able to find a client's MAC address remotely through scripting unfortunately.

May I ask why you want to get the MAC address.
If you think you are requesting a unique ID, MAC addresses are not as unique as you might think they are. A MAC address can easily be changed and/or spoofed.


Thanks ,but I know all of this. The reason I want a MAC address is because I have a login site that I am working on in which a user logs in for a specified time (between a week and a year) without automatically being logged out. Because of this I'm using cookies and not sessions. To make this more secure when they login, a string concatenated of their username, an md5 hash string, and a unix timestamp are all intermixed to make a unique string that is also stored on a cookie. So next time the user returns if that cookie string does not equal the mysql string then they are booted. I want to grab the MAC address because this is yet another way to verify the user's login status. IP addresses are still nasty because there is still a considerable amount of dialup users, and alot of cable and DSL users have dynamic IPs. As well, using the MAC address would eliminate the possibility of someone copying one's cookies into their browser and simply visiting their sites without logging in.

I think that explains why, lol, laidbak if you have any other ideas let me know. Thanks for your help.

Cheers

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  #4  
Old June 26th, 2003, 01:02 PM
iahmed iahmed is offline
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Hi hearn ,
Thats a very interesting Idea which u are trying to implement.
Please do not forget to post it, if you are success.

However, here is an idea, probabbly you know it already:

Run it on your computer or server like this to Get Mac address:
(works in win 2000, XP)

Getmac \\computername or \\computername.domain.com
or
ipconfig/all


If there is way to implement it in PHP!
=================================

Well, lets think together for a better option.


Thanks for the nice posting.

Last edited by iahmed : June 26th, 2003 at 01:08 PM.

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  #5  
Old June 26th, 2003, 01:21 PM
iahmed iahmed is offline
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Another Idea on MAC

Here I wrote small php codes that describes MAC address,
But still I dont know how to execute it from clients browser.

Lets think about it.


<?php
exec("ipconfig /all", $arr, $retval);

for ($i=0;$i<count($arr);$i++) {
echo $arr[$i].'<br>';
}
?>


thanks

Last edited by iahmed : June 26th, 2003 at 01:26 PM.

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  #6  
Old June 26th, 2003, 05:38 PM
digitallysmooth digitallysmooth is offline
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hearn,

I don't think you understand what I'm trying to convey here.
When I mentioned that the MAC address is not as reliable as you think you mentioned you knew that, however you still want to authenticate by MAC address.

You mentioned a good point about not allowing a user to copy a cookie to his browser and gain access... How about that same user changing his MAC address and you are still at square 1.

And to summarize the answer to your original question... I doubt you will find any automated way to find a remote user's MAC address. Not to mention the fact that if you were to gain access to such a device, you'd probably end up 40% of the time with the MAC address of a Router somewhere. Good luck with this one.

If you do happen to find some answers on this I'd greatly appreciate it.

Don't forget to post some stats detailing the success rate also... last thing we need is another so called "unbreakable" login system which is just false security.

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  #7  
Old June 27th, 2003, 09:04 AM
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Wil is right about spoofing a mac address You just need someone who is adamant about gaining access to your machine, and all they need is one sample cookie from your box to figure out what they need to spoof, then they change the mac address inside the ip header on a few packets and boom, they're in.

Also, depending on the type of internet service they are using, their mac address would be different unless they stay in the same location all of the time. You would always get a different MAC, depending on where they are in the nation. For example, someone logs on in Dallas, TX then they will have a different MAC if they logged in from Fresno, CA, because they're using a different ISP, doesn't matter if they use the same computer or not, because they connect out from their machine to another router, and from that router to your computer. Technically they could just change the MAC to reflect that of your router's MAC and it could even give them priveleged access, depending on the way that you have your security setup

The only good usage of MAC filtering is on a big LAN, or even a MAN, where you are wanting to restrict access to the entire network as well as the internet, such as some of the schemas that they use in universities.

If you want something that's a little more secure, maybe you could use something like a private PGP key for the 3rd item to authenticate for?

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  #8  
Old June 27th, 2003, 09:56 AM
digitallysmooth digitallysmooth is offline
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You could also try "Client Certificate Authentication"

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  #9  
Old June 27th, 2003, 11:05 AM
devilFish devilFish is offline
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Would ARP work at all? I know that it is used on networks but is it also used on the net?

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Old June 27th, 2003, 11:37 AM
digitallysmooth digitallysmooth is offline
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ARP is only good on a local machine.
The only way to accomplish this is to have the remote user's machine run ARP, capture the results, then sent it back to the server.

You'd actually have to get the user to install a local app or control on their machine in order for something like this to work.

Even then, you would be relying on an application that may have been uninstalled or deleted by the user.

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  #11  
Old June 27th, 2003, 11:48 AM
iahmed iahmed is offline
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The original post was how to change MAC address over the Internet using serverside scripting like PHP/PERL (means, using browser).

Probably its not possible or there is no shortcut way to do that.

One way:
========

To retrieve the MAC address of a browser machine, you need to have the browser collect and return OS level information to the server. This violates most browser-based active content security models.

There are methods in the Microsoft Technology for getting system-level network information from the inetmib.dll the way IPConfig and WinIPConfig do, and through NetBIOS and COM system calls.


The problem is making such system calls from the browser, a site visitor installs downloaded software from you (ActiveX), then you can deliver a program that sends IPConfig output to the Web server.

Thank You.
====================

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  #12  
Old June 27th, 2003, 11:52 AM
iahmed iahmed is offline
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DevilFish: Would ARP work at all? I know that it is used on networks but is it also used on the net?




ARP works by broadcasting the request to every station under the convention that only the machine that "owns" the IP address being requested will answer the ARP request by sending the answer (including the correct MAC address)

So the straight forward answer is Yes ARP will work, but...

If I assign (change) same MAC address to all computers in my subnet. Then how ARP will work? Can anyone discuss this issue?

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Old June 27th, 2003, 11:58 AM
iahmed iahmed is offline
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If You are seriously motivated to change MAC addresses, but you don't have time to go through all steps of manual changing, you can download these free tool to do so:

For Windows:
http://www.klcconsulting.net/smac/terms_of_use.htm


For Linux:
http://www.alobbs.com/modules.php?o...macc&file=index

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  #14  
Old June 27th, 2003, 12:04 PM
devilFish devilFish is offline
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Quote:
Originally posted by laidbak
ARP is only good on a local machine.


I know that the company network uses ARP and is used accross the network, I see the packets that contain "Who has .... tell ..." and all of that goodness. So I guess I am a little confused by that comment.

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Old June 27th, 2003, 12:43 PM
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Quote:
Originally posted by devilFish


I know that the company network uses ARP and is used accross the network, I see the packets that contain "Who has .... tell ..." and all of that goodness. So I guess I am a little confused by that comment.


ARP (Address Resolution Protocol) Is what is used by gateways, routers and switches to determine the propper machine to send a packet to. It's utilized on the second level of the OSI model.. And it is only utilized within the subnet that the request is sent through..


Here are a few links about ARP

http://www.wildpackets.com/compendium/IP/ARP.html

http://compnetworking.miningco.com/...y/bldef-arp.htm

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Old June 27th, 2003, 12:48 PM
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I am intruiged by this concept... I know that SOME mIRC scripts and bots ban their users by their MAC address....

It could also provide a more accurate way of banning visitors from your site, as opposed to IP...

A cunning idea... but I do believe it's not possible...

-Shade

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  #17  
Old June 27th, 2003, 01:06 PM
digitallysmooth digitallysmooth is offline
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Quote:
Originally posted by taintedutopia
A cunning idea... but I do believe it's not possible...

I disagree. I see that it is possible; unfortunately it is at the same time a deceivingly inaccurate and inconsistent method.

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Old June 27th, 2003, 02:13 PM
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It's entirely possible, but completely insecure. I can spoof both my ISP, MAC address and IP address on mIRC, as well as through a browser. That's what laidbak and I are trying to say.. It's insecure and unreliable.. you'd be better off using something other than the MAC address for client security. If you had this security measure implimented, then all an experienced hacker would need is your user name, and your IP address, and they could get both your MAC, and eventually the password (using brute force techniques)

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  #19  
Old June 27th, 2003, 03:35 PM
digitallysmooth digitallysmooth is offline
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Very well said.

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  #20  
Old June 27th, 2003, 08:52 PM
hearn hearn is offline
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I understand that it is very easy to spoof a MAC address and all that, because I can as well... But....Most people visiting a website wouldn't know how to do that, along with the fact that they most likely wouldnt' even know how to copy over a cookie. I'm not using it as a strict way to ban people, I'm using it as a BACKUP method of checking to see if the user is valid. I think people are blowing this up into a bigger deal then it is, I have plenty of experience in authentication methods and there is no TRUE method of really authenticatiing a checking a user without false ways to spoof or change the results. Hopefully someone will be able to find a way to do this.... I've tried everything I can think of without having a third party app installed on the client's computer.

Cheers.

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  #21  
Old June 28th, 2003, 09:56 AM
digitallysmooth digitallysmooth is offline
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PHP Code:
 wouldnt' even know how to copy over a cookie 
Sound like you should use cookies as your primary method (which you probably are)
Quote:
I'm using it as a BACKUP method
As there is really no reliable way to do this there would be no use in having it as a backup
Quote:
no TRUE method of really authenticatiing
To an extent this is true. If you are not physically checking or patting them down then there is always a chance that someone is not who they say they are... however, there are other pretty good ways of authenticating as I'm sure you are aware of.

Sorry there was no solution for you. I know it can be frustrating when you really have your mind set on something.

If you really have your mind set on this, pick up Visual Basic and write yourself an activeX control that grabs this information. Some users will agree to have the control installed which others will not; As you said this was only a backup solution, you should not have a problem with the resulting ratio of acceptance.

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Old June 28th, 2003, 10:43 AM
Taelo Taelo is offline
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If I remember correctly,...the Mac gets put on at layer 2,....each router strips that sending mac and replaces it with the next hop router and re-encapsulates. so like the person above said,...you may only be getting the mac of your gateway router or brouter
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  #23  
Old February 12th, 2004, 07:38 PM
JBrowatzke JBrowatzke is offline
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Lightbulb PHP Solution

There is a solution I translated from a ASP script to get the MAC Address but as said before you can only get the last routing Address

PHP Code:
<?
Function GetMACAddress($strIP){

    
exec"$_ENV[ComSpec] /c nbtstat -A $strIP",$output);
         foreach(
$output as $s){
              
$data strtoupper(trim($s));
              If (
strpos($data,"MAC ADDRESS")!==false){
                   
$t explode("=",$data);
                   
$macaddress trim($t[1]);
                   break;
              }
         }

    return 
$macaddress;
}

$strIP $_SERVER["REMOTE_ADDR"];
$strMac GetMACAddress($strIP);
$strHost $_SERVER["REMOTE_HOST"];


echo 
"Your IP is : $strIP<br/>\r\n";
echo 
"Your MAC is : $strMac\r\n";
?>

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  #24  
Old December 22nd, 2004, 03:08 AM
LoreZyra LoreZyra is offline
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Thumbs down Get MAC via PHP/JS/ASP

I tried this... It only works for the local LAN! It doesn't work for visitors coming from outside my LAN...



Quote:
Originally Posted by JBrowatzke
There is a solution I translated from a ASP script to get the MAC Address but as said before you can only get the last routing Address

PHP Code:
<?
Function GetMACAddress($strIP){
 
exec"$_ENV[ComSpec] /c nbtstat -A $strIP",$output);
foreach(
$output as $s){
$data strtoupper(trim($s));
If (
strpos($data,"MAC ADDRESS")!==false){
$t explode("=",$data);
$macaddress trim($t[1]);
break;
}
}
 
return 
$macaddress;
}
 
$strIP $_SERVER["REMOTE_ADDR"];
$strMac GetMACAddress($strIP);
$strHost $_SERVER["REMOTE_HOST"];
 
 
echo 
"Your IP is : $strIP<br/>\r\n";
echo 
"Your MAC is : $strMac\r\n";
?>

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  #25  
Old December 22nd, 2004, 03:37 AM
LoreZyra LoreZyra is offline
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Lightbulb Get MAC via PHP/JS/ASP

Background: I'm creating a VPN configuration utility that will configure a user's machine via the web. I perform some basic checks on the remote system i.e. IP/hostname reverse checks. Additionally, I'm using PHP ldap functions to authenicate the user through my custom built login procedure. The idea is that the user simply points the browser (IE: forced) to my webpage; logs in; webpage detects computer information (MAC, Acct Info, IP, User Agent, etc) and configs the machine to use the VPN server/gateway. I'm creating this because, I won't be able to physically config each roadwarrior's machine. Roadwarrior's don't always drop by the office and therefore I don't have physical access to the machine.


Problem: I need a reliable method of sniffing the roadwarrior's MAC address. Based on my research, PHP/JAVA/ASP offer no reliable method of sniffing the MAC remotely (through external LAN) from the webserver. I'm using a custom ipsec utility to bind the configuration. To secure it, I need the MAC of the roadwarrior's box. Additionally, I need to store that MAC into a DataBase on the server/webserver. (I may just use Active Directory via LDAP instead -- edit user description...)

Potential method 1: Write an ActiveX control that the user can download and run from his/her box. The ActiveX control would have to be accessable from the web browser.

Potential method 2: Write a full C++/VB/VC app that the user downloads & runs from website.

Final Thought: If someone has already resolved these issues, I would greatly appreciate a response. Otherwise, I won't be sleeping for a while...

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  #26  
Old December 22nd, 2004, 03:42 AM
LoreZyra LoreZyra is offline
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GetMac

This utility is not installed by default! You have to install it from the support tools folder off your Windows CD. (or download it from MS & install it)

Quote:
Originally Posted by iahmed
Hi hearn ,
Thats a very interesting Idea which u are trying to implement.
Please do not forget to post it, if you are success.

However, here is an idea, probabbly you know it already:

Run it on your computer or server like this to Get Mac address:
(works in win 2000, XP)

Getmac \\computername or \\computername.domain.com
or
ipconfig/all


If there is way to implement it in PHP!
=================================

Well, lets think together for a better option.


Thanks for the nice posting.

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  #27  
Old December 22nd, 2004, 03:48 AM
LoreZyra LoreZyra is offline
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Get Mac via ActiveX

The following link provides some insight:
http://www.nwfusion.com/columnists/2002/1104blass.html

Quote:
Originally Posted by iahmed
The original post was how to change MAC address over the Internet using serverside scripting like PHP/PERL (means, using browser).

Probably its not possible or there is no shortcut way to do that.

One way:
========

To retrieve the MAC address of a browser machine, you need to have the browser collect and return OS level information to the server. This violates most browser-based active content security models.

There are methods in the Microsoft Technology for getting system-level network information from the inetmib.dll the way IPConfig and WinIPConfig do, and through NetBIOS and COM system calls.


The problem is making such system calls from the browser, a site visitor installs downloaded software from you (ActiveX), then you can deliver a program that sends IPConfig output to the Web server.

Thank You.
====================

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  #28  
Old January 28th, 2005, 06:35 PM
smartnsr_y2k smartnsr_y2k is offline
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Hi I also try this but it give onle the IP address of my local system.

Quote:
Originally Posted by LoreZyra
I tried this... It only works for the local LAN! It doesn't work for visitors coming from outside my LAN...



Hi I also try this but it give onle the IP address of my local system. Is Any body can tell me that How i Can Get MAC id of Client system.
Please.

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