I'm not sure if this is the log entry you are looking for. I had many of these last night.
[Dec 9 06:47:51] NOTICE[5630]: chan_sip.c:15593 handle_request_register: Registration from '"106" <sip:1...@mywanaddress>' failed for '121.11.158.174' - Wrong password If you need more information from this Asterisk box let me know. I need to find a way to block these also. Gary On 9 Dec 2010 at 7:57, Joe (Joe Greco <asterisk-users@lists.digium.com>) commented about [asterisk-users] Asterisk SIP attac: > Hello, > > We had been seeing SIP-guessing attacks on our Asterisk server here. > > While it wasn't that hard to write a once-a-minute cron job to spank > the lusers, that runs once a minute and creates little spikes in the > usage and I/O graphs, and is slower to respond than I'd really prefer. > I felt that it'd be much cooler to get something more comprehensive > put together. We don't use fail2ban because I don't like having to > install python. > > sshguard is a high-performance compiled C application that can run > off a log file or a pipe from syslogd to sshguard, meaning that it > can respond a lot more quickly than once a minute, and works with > very modest overhead on the host system. It also has features such > as touchiness, so that it can get tougher on a miscreant as time goes > on; my own shell script is naive in that once it passes a threshold, > there's just a permanent rule generated. This worries me if I ever > have a situation where a legitimate remote client gets messed up and > tries the wrong password or something like that; sshguard does a much > nicer job in this regard. > > In any case, my initial attempts to create rules for sshguard didn't > work right, quite possibly because I don't often work in LEX/YACC. > I submitted a request to the sshguard guys suggesting new rules. > > http://www.sshguard.net/support/submission/detail/49ce7182028d8b6f3e3d/ > > and on their mailing list, a little more: > > http://sourceforge.net/mailarchive/forum.php?thread_name=F4E10075-5D93-43B4-B73A-1FD217BE130D%40sshguard.net&forum_name=sshguard-users > > In particular, they're looking for log examples of some of those > messages, but I have no idea how to generate the conditions that would > cause these messages. I'm also not sure if there's a way to disable > color codes in the Asterisk log files; we log indirectly via BSD's > "logger" > > # asterisk -vvv 2>&1 | logger -t asterisk > > so it may be thinking that the console is color-capable. We use this > method because this forces them through the syslog mechanism; we need > that for centralized logging, and it's handy for things like sshguard > too. > > Specifically looking for examples of (or how to generate) > > 1) .*No registration for peer '.*' (from <HOST>) > 2) .*Host <HOST> failed MD5 authentication for '.*' (.*) > 3) .*Failed to authenticate user .*@<HOST>.* > > If anyone who is more familiar with the attacks or how to generate > these messages would give me some assistance, or chime in on the > sshguard-users list, that'd be most appreciated. > > Thanks. > > ... JG > -- > Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net > "We call it the 'one bite at the apple' rule. Give me one chance [and] then I > won't contact you again." - Direct Marketing Ass'n position on e-mail > spam(CNN) > With 24 million small businesses in the US alone, that's way too many apples. > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users