barns101
msg:3205181 | 9:14 pm on Jan 1, 2007 (gmt 0) |
I don't know what you mean by "mid", but you should probably take a look at strpos() [php.net]. Also, remember that some web browsers will not send the referrer and so the check is not always accurate.
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eelixduppy
msg:3205182 | 9:16 pm on Jan 1, 2007 (gmt 0) |
Welcome to WebmasterWorld, FuzzyLogik! A referrer cannot entirely be trusted. Maybe if I knew a little more about why you are doing this I can find an alternate solution that is a little more reliable.
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FuzzyLogik
msg:3205239 | 10:29 pm on Jan 1, 2007 (gmt 0) |
Hmm, alright. Basically, I want to link to a site without actually linking to it, so I have the following in my .htacccess: RewriteRule ^offsite/([A-Za-z0-9_\ %\.\\-]+)$ redirect.php?site=$1 which will take any url, such as:
[mysite.com...] and pass it to redirect.php?site=thissite.com redirect was going to(prior to my finding out it wouldn't always work) check the referrer and make sure it matched the host, so people can't just type in any url, it had to be coming from my site. How else would you recommend I do this?
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mcavic
msg:3205290 | 11:58 pm on Jan 1, 2007 (gmt 0) |
Why does it matter if people type their own URLs? Are you worried about loss of bandwidth over time due to bookmarks, etc? Or is it a security concern?
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FuzzyLogik
msg:3205293 | 12:02 am on Jan 2, 2007 (gmt 0) |
Phishing. I don't want people to say, "look, my site is hosting at so-and-so's site. www.mysite.com/offsite/virusinstall.com
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mcavic
msg:3205409 | 3:37 am on Jan 2, 2007 (gmt 0) |
Ah, good point. Last I checked, about 10% if my hits didn't have the proper referral. But at least one site I know of seems to use the referrer anyway, to protect its images. You could probably set up a cookie-based system to only allow the redirect if the user has been to a referring page within the last hour or two. It would take some work, though.
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FuzzyLogik
msg:3205887 | 4:22 pm on Jan 2, 2007 (gmt 0) |
I would rather not use cookies or sessions, is there another way?
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mcavic
msg:3205931 | 4:54 pm on Jan 2, 2007 (gmt 0) |
You could give the redirect script a security code, and generate a new valid code each time someone hits a calling page. Of course all of the calling pages would have to be PHP, but you could use an algorithm to generate and validate the codes, so that you wouldn't have to keep a list of them. The codes could be time-based so that they expire. Or for another solution, you could store all of the links in a database, and refer to them with a code, like TinyURL does. That might be harder to maintain, but it would be most secure.
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FuzzyLogik
msg:3205952 | 5:06 pm on Jan 2, 2007 (gmt 0) |
I was thinking about the code one before, but I'm not entirely how how the best way to go about that is. I would need an encyption alg. that others don't have access to. I guess I could md5 a text string with a timestamp, but that seems silly, really. Any suggestions on the best way to implement the code version? (I would prefer a 4-5 digit code, if it has to be in the URL itself. such as: mysite.com/offsite/yoursite.com?f49Kd
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mcavic
msg:3205976 | 5:25 pm on Jan 2, 2007 (gmt 0) |
I'll sticky you some code.
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