Re: [Zope] Re: Handling login failures
Håkan Johansson wrote: On Jan 13, 2006, at 00:32, Dennis Allison wrote: A more usual solution to this issue is to insert a delay after the third and subsequent failures. You, of course, need a policy for removing the delay (successful login or N minutes following the last attempt). Yes, I have been thinking the same thing. It would be much less work for the admin of the system. Thanks for the tip though :) _ Of course if you enforced longer passwords you can achieve a similar result. You dont slow time down between authentication events (like Dennis suggests) but you add the amount of time needed to guess a password. So (slow Auth reponsies + tries) can approximate (fast Auth responses + alot more tries) David ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Re: Handling login failures
On Jan 13, 2006, at 00:32, Dennis Allison wrote: A more usual solution to this issue is to insert a delay after the third and subsequent failures. You, of course, need a policy for removing the delay (successful login or N minutes following the last attempt). Yes, I have been thinking the same thing. It would be much less work for the admin of the system. Thanks for the tip though :) ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
[Zope] Re: Handling login failures
On Jan 13, 2006, at 00:24, Florent Guillaume wrote: Håkan Johansson wrote: I want to be able to block a user from logging in if he fails to give the right login/password three times in a row. You're aware that this allows anyone to trivially DoS your users, right? If you take the precaution of matching with the IP, it still will harm people logging in through corporate or ISP proxies. Which, admittedly, may not be a problem in an intranet setting. Florent This is not really a problem for us since we have a firewall that must be logged into first. Only customers to the system can actually access it. If I had a say in it, I would not implement a system like this at all, but our customer wants it. Thanks for the warning though. I hadn't thought about the DoS aspect. ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Re: Handling login failures
A more usual solution to this issue is to insert a delay after the third and subsequent failures. You, of course, need a policy for removing the delay (successful login or N minutes following the last attempt). On Fri, 13 Jan 2006, Florent Guillaume wrote: > Håkan Johansson wrote: > > I want to be able to block a user from logging in if he fails to give > > the right login/password three times in a row. > > You're aware that this allows anyone to trivially DoS your users, right? > If you take the precaution of matching with the IP, it still will harm > people logging in through corporate or ISP proxies. Which, admittedly, > may not be a problem in an intranet setting. > > Florent > > > The problem is that I don't know how to do this. > > > > First, I need to know if an attempt failed. This, I have no idea how to do. > > > > Second, I need to block the user without deleting him. One problem here > > is that the user can write different login names for the different login > > attempts. We have been thinking about blocking the offender's IP for 30 > > minutes or so and leave it at that. It seems to me that > > SiteAccess.AccessRule could be used for that, but I haven't looked much > > into it yet. The documentation is extremely light. > > > > > > I have a very clean Zope 2.8.4 installation on a SuSE linux machine. > > Logins are handled in the standard Zope way, nothing special added. > > The Zope is running as a stand alone server, i.e. no Apache at all. > > > > > > Another thing: How do I get Zope to log failed authentication attempts? > > Neither event.log or Z2.log shows anything. As Z2.log is the access log, > > I would have guessed that such things should be logged there. If not, > > where and how? > > > > -- ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
[Zope] Re: Handling login failures
Håkan Johansson wrote: I want to be able to block a user from logging in if he fails to give the right login/password three times in a row. You're aware that this allows anyone to trivially DoS your users, right? If you take the precaution of matching with the IP, it still will harm people logging in through corporate or ISP proxies. Which, admittedly, may not be a problem in an intranet setting. Florent The problem is that I don't know how to do this. First, I need to know if an attempt failed. This, I have no idea how to do. Second, I need to block the user without deleting him. One problem here is that the user can write different login names for the different login attempts. We have been thinking about blocking the offender's IP for 30 minutes or so and leave it at that. It seems to me that SiteAccess.AccessRule could be used for that, but I haven't looked much into it yet. The documentation is extremely light. I have a very clean Zope 2.8.4 installation on a SuSE linux machine. Logins are handled in the standard Zope way, nothing special added. The Zope is running as a stand alone server, i.e. no Apache at all. Another thing: How do I get Zope to log failed authentication attempts? Neither event.log or Z2.log shows anything. As Z2.log is the access log, I would have guessed that such things should be logged there. If not, where and how? -- Florent Guillaume, Nuxeo (Paris, France) Director of R&D +33 1 40 33 71 59 http://nuxeo.com [EMAIL PROTECTED] ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
