Renamed to faq-abuse, set it up like the other faq pages.
Andrew Lewman commited on 2005-06-07 03:46:30
Zeige 1 geänderte Dateien mit 29 Einfügungen und 43 Löschungen.
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- <title>Tor: FAQs</title> |
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- <meta name="Author" content="Roger Dingledine" /> |
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+ <title>Legal FAQ for Tor Server Operators</title> |
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<div class="main-column"> |
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-<h2>Abuse</h2> |
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+<!-- PUT CONTENT AFTER THIS TAG --> |
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+<h2>Abuse FAQ for Tor Server Operators</h2> |
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+<hr /> |
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-<a id="WhatAboutCriminals"></a> |
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<p> </p> |
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<h3>Doesn't Tor enable criminals to do bad things?</h3> |
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<p>Criminals can already do bad things. Since they're willing to break laws, they already have lots of options available that provide _better_ privacy than Tor provides. They can steal cell phones, use them, and throw them in a ditch; they can crack into computers in Korea or Brazil and use them to launch abusive activities; they can spread viruses that take control of literally millions of Windows machines around the world. </p> |
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-<p>Tor aims to provide protection for ordinary people who want to follow the law. Only criminals have privacy right now; we need to fix that. <a href="#WhatAboutCriminals">[#</a>] </p> |
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-<a id="AbuseTradeoff"></a> |
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+<p>Tor aims to provide protection for ordinary people who want to follow the law. Only criminals have privacy right now; we need to fix that. </p> |
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<p> </p> |
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<h3>Isn't it just a tradeoff: accepting the bad uses for the good ones?</h3> |
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<p>No, we don't think that's how it works in the case of Tor. </p> |
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<p>There are lots of ways to get anonymity on the net, some legal and some illegal. As we explained <a href="#WhatAboutCriminals">above</a>, many of the illegal approaches can provide stronger anonymity than Tor can provide, because they can control literally millions of computers via spyware, viruses, and other techniques. </p> |
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<p>Criminals and other bad people have the motivation to learn how to get good anonymity, and many have the motivation to pay well to achieve it. Being able to steal and reuse the identities of innocent victims (identify theft) makes it even easier. Normal people, on the other hand, don't typically have the time or money to spend figuring out how to get privacy online. This is the worst of all possible worlds. </p> |
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-<p>So yes, criminals could in theory use Tor, but they already have better options, and it seems unlikely that taking Tor away from the world will stop them from doing their bad things. At the same time, Tor and other privacy measures can *fight* identity theft, physical crimes like stalking, and so on. <a href="#AbuseTradeoff">[#</a>] </p> |
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-<a id="AbuseDDoS"></a> |
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+<p>So yes, criminals could in theory use Tor, but they already have better options, and it seems unlikely that taking Tor away from the world will stop them from doing their bad things. At the same time, Tor and other privacy measures can *fight* identity theft, physical crimes like stalking, and so on. </p> |
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<p> </p> |
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<h3>What about distributed denial of service attacks?</h3> |
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<p>Distributed denial of service attacks typically rely on having a group of thousands of computers all sending floods of traffic to a victim. Since the goal is to overpower the bandwidth of the victim, they typically send UDP packets since those don't require handshakes or coordination. </p> |
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<p>But because Tor only transports correctly-formed TCP streams, not all IP packets, you cannot send UDP packets over Tor. (You can't do specialized forms of this attack like SYN flooding either.) So ordinary DDoS attacks are not possible over Tor. Tor also doesn't allow bandwidth amplification attacks against external sites: you need to send in a byte for every byte which the Tor network will send to your destination. So in general, attackers who control enough bandwidth to launch an effective DDoS attack can do it just fine without Tor. </p> |
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-<p>And if this argument doesn't convince you, go try Tor and see how much aggregate throughput you can eke out of it, then come back to us if you're still worried. <img src="/wiki/classic/img/smile.png" width="15" alt=":)" height="15" > <a href="#AbuseDDos">[#</a>] </p> |
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-<a id="WhatAboutSpammers"></a> |
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+<p>And if this argument doesn't convince you, go try Tor and see how much aggregate throughput you can eke out of it, then come back to us if you're still worried. <img src="/wiki/classic/img/smile.png" width="15" alt=":)" height="15" > </p> |
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<p> </p> |
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<h3>What about spammers?</h3> |
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<p>The default Tor exit policy rejects all outgoing port 25 (SMTP) traffic. So sending spam mail through Tor isn't going to work. It's possible that some server operators will enable port 25 on their particular exit node, in which case only that computer will allow outgoing mails; but that individual could just set up an open mail relay too, independent of Tor. </p> |
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<p>So far, no Tor server has enabled outgoing port 25 in his exit policy. </p> |
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-<p>In short, Tor isn't useful for spammers. <a href="#WhatAboutSpammers">[#</a>] </p> |
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-<a id="ExitPolicies"></a> |
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+<p>In short, Tor isn't useful for spammers. </p> |
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<p> </p> |
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<h3>How do Tor exit policies work?</h3> |
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<p>Each Tor server has an exit policy that specifies what sort of outbound connections are allowed or refused from that server. The exit policies are propagated to the client via the directory, so clients will automatically avoid picking exit nodes that would refuse to exit to their intended destination. </p> |
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-<p>This way each server can decide the services he wants to allow connections to, based on abuse potential and his own situation. <a href="#ExitPolicies">[#</a>] </p> |
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-<a id="HowMuchAbuse"></a> |
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+<p>This way each server can decide the services he wants to allow connections to, based on abuse potential and his own situation. </p> |
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<p> </p> |
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<h3>Does Tor get much abuse?</h3> |
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<p>Not much, in the grand scheme of things. We've been running the network since October 2003, and it's only generated a handful of complaints. Of course, like all privacy-oriented networks on the net, we attract our share of jerks. Tor's exit policies help separate the role of "willing to donate resources to the network" from the role of "willing to deal with exit abuse complaints", so we hope our network is more sustainable than past attempts at anonymity networks. </p> |
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-<p>Since Tor has <a class="external" href="http://tor.eff.org/cvs/tor/doc/tor-doc.html"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > many good uses as well</a>, we feel that we're doing pretty well at striking a balance currently. <a href="#HowMuchAbuse">[#</a>] </p> |
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-<a id="TypicalAbuses"></a> |
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+<p>Since Tor has <a class="external" href="http://tor.eff.org/cvs/tor/doc/tor-doc.html"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > many good uses as well</a>, we feel that we're doing pretty well at striking a balance currently. </p> |
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<p> </p> |
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<h3>So what should I expect if I run a server?</h3> |
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<li><p> Wikipedia is currently blocking many Tor server IPs from writing (reading still works), because they haven't figured out internally how to deal with the fact that they want to provide open access but they also have no ways to control abuse to their website. We're working with them to resolve this. </p> |
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</li> |
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-<li class="gap"><p> It seems that SORBS is putting some Tor server IPs on their email blacklist as well. They do this because they passively detect whether your server connects to certain IRC networks, and they conclude from this that your server is capable of spamming. We're working with them to teach them that not all software works this way. Until then, we recommend you avoid them, and teach your friends (if they use them) to avoid them too. <a href="#TypicalAbuses">[#</a>] </p> |
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+<li class="gap"><p> It seems that SORBS is putting some Tor server IPs on their email blacklist as well. They do this because they passively detect whether your server connects to certain IRC networks, and they conclude from this that your server is capable of spamming. We're working with them to teach them that not all software works this way. Until then, we recommend you avoid them, and teach your friends (if they use them) to avoid them too. </p> |
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</li> |
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</ul> |
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-<a id="IrcBans"></a> |
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<p> </p> |
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<h3>Tor is banned from the IRC network I want to use.</h3> |
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<p>But the real answer is to implement application-level auth systems, to let in well-behaving users and keep out badly-behaving users. This needs to be based on some property of the human (such as a password he knows), not some property of the way his packets are transported. </p> |
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<p>Of course, not all IRC networks are trying to ban Tor nodes. After all, quite a few people use Tor to IRC in privacy in order to carry on legitimate communications without tying them to their real-world identity. Each IRC network needs to decide for itself if blocking a few more of the millions of IPs that bad people can use is worth losing the contributions from the well-behaved Tor users. </p> |
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<p>If you're being blocked, have a discussion with the network operators and explain the issues to them. They may not be aware of the existence of Tor at all, or they may not be aware that the hostnames they're klining are Tor exit nodes. If you explain the problem, and they conclude that Tor ought to be blocked, you may want to consider moving to a network that is more open to free speech. Maybe inviting them to #tor on irc.oftc.net helps them show that we are not all evil people. </p> |
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-<p>Finally, if you become aware of an IRC network which seems to be blocking Tor, or a single Tor exit node, please put that information on <a href="/noreply/TheOnionRouter/BlockingIrc">../BlockingIrc</a> so that others can share. At least one IRC network consults that page to unblock exit nodes which have been blocked inadvertently. <a href="#IrcBans">[#</a>] </p> |
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-<a id="SMTPBans"></a> |
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+<p>Finally, if you become aware of an IRC network which seems to be blocking Tor, or a single Tor exit node, please put that information on <a href="/noreply/TheOnionRouter/BlockingIrc">../BlockingIrc</a> so that others can share. At least one IRC network consults that page to unblock exit nodes which have been blocked inadvertently. </p> |
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<p> </p> |
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<h3>Your nodes are banned from the mail server I want to use.</h3> |
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-<p>Even though <a class="external" href="http://wiki.noreply.org/wiki/TheOnionRouter/TorFAQ#WhatAboutSpammers"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > Tor isn't useful for spamming</a>, some over-zealous blacklisters seem to think that all open networks like Tor should be boycotted. They don't understand how Tor works (e.g. that it has exit policies), and don't seem to care to understand it. If your server administrators decide to make use of these blacklists to refuse incoming mail, you should have a conversation with them and explain how Tor works. <a href="#SMTPBans">[#</a>] </p> |
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-<a id="Bans"></a> |
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+<p>Even though <a class="external" href="http://wiki.noreply.org/wiki/TheOnionRouter/TorFAQ#WhatAboutSpammers"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > Tor isn't useful for spamming</a>, some over-zealous blacklisters seem to think that all open networks like Tor should be boycotted. They don't understand how Tor works (e.g. that it has exit policies), and don't seem to care to understand it. If your server administrators decide to make use of these blacklists to refuse incoming mail, you should have a conversation with them and explain how Tor works. </p> |
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<p> </p> |
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<h3>I want to ban the Tor network from my service.</h3> |
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<p>First, ask yourself if there's a way to do application-level decisions to separate the legitimate users from the jerks. For example, you might have certain areas of the site, or certain privileges like posting, available only to people who are registered. You could set up this distinction only for certain IP addresses such as Tor exit nodes. This way you can have multi-tiered access and not have to ban everything. </p> |
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<p>Second, consider that thousands of people use Tor every day to protect against data-gathering corporations like Doubleclick while going about their normal activities. Some Tor users may be legitimately connecting to your service right now to carry on normal activities. You need to decide whether banning the Tor network is worth losing the contributions of these users, as well as potential future such users. </p> |
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<p>Lastly, please remember that Tor servers have individual exit policies. Many Tor servers do not allow exiting connections at all. Many of those that do, probably already disallow connections to your service. When you go about banning nodes, you should parse the exit policies and only block the ones that allow these connections; and you should keep in mind that exit policies can change (as well as the overall list of nodes in the network). </p> |
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-<p>If you really want to do this, there is a python script to parse the Tor directory <a class="external" href="http://tor.eff.org/cvs/tor/contrib/exitlist"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > here</a>. <a href="#Bans">[#</a>] </p> |
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-<a id="LegalQuestionsAbuse"></a> |
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+<p>If you really want to do this, there is a python script to parse the Tor directory <a class="external" href="http://tor.eff.org/cvs/tor/contrib/exitlist"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > here</a>. </p> |
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<p> </p> |
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<h3>I have legal questions about Tor abuse.</h3> |
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<p>We're only the developers. We can answer technical questions, but we're not the ones to talk to about legal questions or concerns. </p> |
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-<p>Please take a look at the <a class="external" href="http://tor.eff.org//eff/tor-legal-faq.html"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > Tor Legal FAQ</a>, and contact EFF directly if you have any further questions. <a href="#LegalQuestionsAbuse">[#</a>] </p> |
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-<a id="Comparison"></a> |
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+<p>Please take a look at the <a class="external" href="http://tor.eff.org//eff/tor-legal-faq.html"><img src="/wiki/classic/img/moin-www.png" width="11" alt="[WWW]" height="11" > Tor Legal FAQ</a>, and contact EFF directly if you have any further questions. </p> |
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<p> </p> |
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