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| Subject: | Re: shutting down dictionary attacks |
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| Date: | Fri, 15 Jul 2005 15:19:16 -0400 |
We've had some discussion about "Failed password" attacks in this thread. For those of us not using password authentication, that message is certainly disconcerting. Way back around July 5, I'd written in response to this question:
Are you using password login or Public key, perhaps it's the way, youdisable the password login and script kiddies are immediately rejected... Public keys (Protocol 2, RSA) only. As I'd stated in my OP, *I* use standard clients (Putty/OpenSSH/Portable OpenSSH), and there is no password prompt. I STFAed and learned that the scripts don't check auth types, they brute-force passwords anyway.
I found that LogLevel DEBUG3 (or any other DEBUG level) wasn't working for me with OSSH 4.1 on OBSD; so I ran sshd with "-ddd" manually. In front of each "Failed password" message, there's a debug2 message that pops up and makes me feel a whole lot better: "debug2: Unrecognized authentication method name: password" "Failed password for invalid user ..." That certainly confirms that the attempts will fail, even if the attacker uses a valid user/pw combination. I have since stopped using port 22; that certainly cuts down on the number of script kiddies filling up my authlog. I'm wondering if I'm the only one with LogLevel trouble? If so, I won't report a bug.
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