Discuss April 2004

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60 participants
132 discussions

[SURBL-Discuss] Re: Bill Stearns' sa-blacklist available as SURBL: ws.surbl.org
by William Stearns 21 Apr '04

21 Apr '04

[forwarded response from announce list] Good morning, Don, On Tue, 20 Apr 2004, Don Newcomer wrote: > Wow, I implemented this yesterday and, after about 18 hours, this rule was > #4 in my list of most-used rules! Good job, guys! Fantastic! How are the system cpu load and memory usage at the moment? I assume your enthusiasm means they're both in acceptable ranges? Cheers, - Bill --------------------------------------------------------------------------- "... It ... could ... work!" -- Gene Wilder in Young Frankenstein -------------------------------------------------------------------------- William Stearns (wstearns(a)pobox.com). Mason, Buildkernel, freedups, p0f, rsync-backup, ssh-keyinstall, dns-check, more at: http://www.stearns.org --------------------------------------------------------------------------

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[SURBL-Discuss] Re: Bill Stearns' sa-blacklist available as SURBL: ws.surbl.org
by Don Newcomer 21 Apr '04

21 Apr '04

[forwarded response from announce list] Wow, I implemented this yesterday and, after about 18 hours, this rule was #4 in my list of most-used rules! Good job, guys! ================================================================================ Don Newcomer Dickinson College Senior Manager, Systems P.O. Box 1773 newcomer(a)dickinson.edu Carlisle, PA 17013 Phone: (717) 245-1256 FAX: (717) 245-1690

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ANNOUNCE: Mail::SpamAsssassin::SpamCopURI 0.11
by Eric Kolve 21 Apr '04

21 Apr '04

I have just released SpamCopURI version 0.11. This fixes a few bugs that had been reported and adds open redirect resolution. This basically takes a URL from say rd.yahoo.com and attempts to resolve the Location header without ever fetching from the potential spammy site. Only the URLs that have hosts that match an address list get redirect resolution. As well, redirect resolution is off by default, but can be enabled in the conf file. I have placed several open redirect sites in the conf file. The basic requirement is that the redirect return a 300 level HTTP response when fetching. I placed google.com in there even though they don't have their own redirect domain, but this should be fairly safe since most if not all google URLs are either redirects or searches. Give it a try and tell me what you think. This is all dependent upon LWP, but if you don't have LWP everything else will function as it did before. I have removed all the deprecated tests that depended on local Storable data. See the INSTALL file for information about upgrading from a previous version. There is all a bit more information about installation that should help those that had trouble in the past. --eric

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[SURBL-Discuss] Fwd: Re: Bill Stearns' sa-blacklist available as SURBL: ws.surbl.org
by Jeff Chan 21 Apr '04

21 Apr '04

Here are some good comments from Dave Funk about the handling/creation of the SURBLs. Please comment on his suggestions, several of which we may want to implement as time permits. Jeff C. __ On Tue, 20 Apr 2004, Jeff Chan wrote: > On Tuesday, April 20, 2004, 1:20:05 PM, Charles Gregory wrote: > > Would it be possible to have 'surbl.org' run a *combined* blacklist, so > > that people who want to check both 'ws.surbl.org' *and* 'sc.surbl.org' can > > do it with ONE dns lookup request, instead of two? > > Good question, which Matt asks also. Here's my response :-) > [snip..] > > Because ws is larger and more stable, the zone files for it > > gets a six hour TTL compared to 10 minutes for sc. Due to the > > differences between the time scales, sizes, and data sources of > > ws and sc, we probably won't be offering a combined ws plus sc > > list. For example it would be difficult to say what TTL a > > merged list should get, and you probably would not want a > > megabyte plus BIND zone file refreshing every 10 minutes. For > > those using rsynced zone files that would probably not be an > > issue, but for those using BIND, the DNS traffic quite well > > could be. > > So the quick answer is they'll probably not be combined. > > However we probably will offer a combined version of Bill's > list and Chris' BigEvil list since they are more similar in > character. A few comments. 1) It is possible to set a TTL in a DNS zone on a per-record basis. (at least with BIND). So you could combine the two zones and have the 'sc' records flagged with a short TTL, and 'ws' with longer. 2) Newer versions of BIND support incremental zone-transfer, and so will just push changes. 3) We also secondary MAPS RBL+ zone, that's a 54Mbyte zone that updates every 3 hours. (IE 18Mbyte/hour). A 1Mbyte x 10 minutes would be only 6Mbytes/hour, chicken feed. ;) 4) Over half the size of those zones is in the TXT records. Just changing 'Message body contains domain in sa-blacklist. See: http://www.stearns.org/sa-blacklist/' to 'Blocked, See: http://www.stearns.org/sa-blacklist/' reduced the 'ws' zone size by 33% 5) It's possible to combine the zones but keep the data logically seperate so people can differentiate and adjust scores/policys accordingly. Check out how MAPS does RBL+, the A record returns an "IP address" that is effectivly a bit-mask flag to indicate which MAPS zone the original hit was from (DUL, RSS, RBL, OPS, etc). Look at how the 'check_rbl' and 'check_rbl_sub' routines are used inside SA to pull apart a single DNS query against RBL+ (at least in SA 2.6*, havn't looked at 3.0 yet ;) This is not to imply criticism if your response, just some tech info to show alternatives. Regardless, I would recommend using 5) when you combine Bill's list and Chris' BigEvil so that people can differentiate in case they have score/policy concerns regarding the two. People who just look for the existence of the A record won't notice the difference but people who know and care can utilize the additional info. Dave -- Dave Funk University of Iowa <dbfunk (at) engineering.uiowa.edu> College of Engineering 319/335-5751 FAX: 319/384-0549 1256 Seamans Center Sys_admin/Postmaster/cell_admin Iowa City, IA 52242-1527 #include <std_disclaimer.h> Better is not better, 'standard' is better. B{ -- Jeff Chan mailto:jeffc@surbl.org-nospam http://www.surbl.org/

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[SURBL-Discuss] RE: RFC: Removing example.com as a testpoint (Was: Re: [SURBL-Dis cuss] Re: No install Problems with 0.10)
by Chris Santerre 20 Apr '04

20 Apr '04

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[SURBL-Discuss] Re: tips for SURBL on setting up reverse proxy NS's? (fwd)
by Justin Mason 20 Apr '04

20 Apr '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 forwarded from one DNSBLer... > I'm running one of the proxies for openrbl.org. It's dead easy to set > this up -- a copy of Pound, a dedicated IP address, and 5 minutes to > write a 20 line config file. Pound helps "clean" the requests, and > hides the real back-end server. > > The portion of openrbl.org I proxy uses under 10kbps on average, with a > spike every few days for up to a few hours when someone tries to smack > it. I run the IP through a 64kbps pipe with ipfw (gateway box runs > FreeBSD) for extra warmfuzzies, and packet filter all but port-80 to the > IP I've assigned. > > > [...] fancy posting to discuss(a)lists.surbl.org with tips? > > I'm at my quota for mailing lists -- if I subscribe to another, my nose > will bleed. Pound is dead easy. I would venture to guess that someone > who can't get it running probably shouldn't. > > Pound is at http://www.apsis.ch/pound/, or in ports/www/pound if you're > FreeBSDing it. Another tip from the SBL folks: > I'm not even sure where the root SBL zone server is. All the public zone > servers and AXFR feeds are seperate. Query load is rather large, so > sub-zones are being broken out to two levels, allowing for more > nameservers to spread out the load. (Admins are encouraged to use > close-by servers when possible.) Check "NS" records for > "sbl.spamhaus.org". > > Probably goes without saying, but selecting a zone name that can be "end > of lifed" when needed should be considered. Also, someone else mentioned that the top-level zone, "surbl.org" for example, may become the target. So that also needs 2ndaries. - --j. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Exmh CVS iD8DBQFAhBoMQTcbUG5Y7woRArYEAKDNaPrBvk8R9TgGbxVRrVZKNXftKQCgzd3U zZlpJ3DwvnDV1aUlly2jspU= =mVsZ -----END PGP SIGNATURE-----

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RE: [SURBL-Discuss] No install Problems with 0.10
by ITReading ITReading 20 Apr '04

20 Apr '04

Did you remember to copy the .cf file to your spamassassin rules folder? (I only mention this b/c I tend to forget to do the most obvious of steps). If you run spamassassin -D -t on a test message, do you see it attempting to perform the queries? -Charles >>> Paul Barbeau <Paul(a)hypernet.ca> 04/13/2004 9:00:36 PM >>> I guess i spoke to soon.. The "make test" works and it looks like the "make install" works however when i send an email through with "http://test.diliberatelybroken.surbl.org/" in it nothing gets tagged. Is that the correct URL to use to confirm it is working? Any ideas? Paul _______________________________________________ Discuss mailing list Discuss(a)lists.surbl.org http://lists.surbl.org/mailman/listinfo/discuss

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RE: RFC: Removing example.com as a testpoint (Was: Re:[SURBL-Discuss] Re: No install Problems with 0.10)
by Scott Truman 20 Apr '04

20 Apr '04

> > > I would suggest using a known TLD. I could imagine SpamAssassin > > > or another product, if they don't already, including optimisations > > > to avoid querying on things that *look* like URLs but > can't possibly > > > be; and putting in a special case for SURBL would be a bit silly > > > if we can avoid it. > > > > That was my inclination too. A real TLD with a fake domain > > should be the most "standard"... for an obscured domain. :-) > > Then, my suggestion would be something inside the surbl > domain. Otherwise > there is a risk (albeit remote) that someone could register > the domain and > have a problem. > sheesh...I don't see why this is still being debated. It seems pretty obvious that example.com is a bad choice, and that a TLD within the surbl domain would be better a better test point. Now just pick one and announce it. Next please...

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update on unparsed url types
by John Fawcett 20 Apr '04

20 Apr '04

This is an update from yesterday's post on urls which are not currently being parsed by sa in version 2.63 Further cases: 6. msn redirection services g.msn.com workaround for PerMsgStatus.pm $uri =~ s/^http:\/\/g.msn.com\/[^\*]+\?http\:(.*)$/http\:$1/g; 7. use of html escape sequences in the url http://toform.net/mcp/879/1352/cap112.html To translate these into the equivalent ascii characters, I have used HTML::entities rather than reinvent the wheel workaround for PerMsgStatus.pm use HTML::Entities; $uri = HTML::Entities::decode($uri); Here is a cumulative diff containing the workarounds for these and the previous cases. The diff is against PerMsgStatus.pm 2.63 already patched with SpamCopUri 0.09 Hopefully someone can include these in version 3 and more elegantly.... diff PerMsgStatus.pm.orig PerMsgStatus.pm ----cut------- 45a47 > use HTML::Entities; 1777a1780,1789 > dbg("Got URI: $uri"); > $uri =~ s/\%68/h/g; > $uri =~ s/\%74/t/g; > $uri =~ s/\%70/p/g; > $uri =~ s/http:\/([^\/])/http:\/\/$1/g; > $uri =~ s/http:\/\/http:\/\//http:\/\//g; > $uri =~ s/^http:\/\/(?:drs|rd).yahoo.com\/[^\*]+\*(.*)$/$1/g; > $uri =~ s/^http:\/\/g.msn.com\/[^\*]+\?http\:(.*)$/http\:$1/g; > $uri = HTML::Entities::decode($uri); > dbg("URI after filter: $uri"); ----cut-------

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Re: [SURBL-Announce] SURBL Implemetation Guidelines
by Jeff Chan 20 Apr '04

20 Apr '04

On Monday, April 19, 2004, 5:32:32 PM, Devin Carraway wrote: > Two suggestions: > On Mon, Apr 19, 2004 at 04:52:03PM -0700, Jeff Chan wrote: >> 4. Look up the domain name in the SURBL by prepending it to >> the name of the SURBL, e.g., domainundertest.com.sc.surbl.org, >> then doing Address record DNS resolution on the resulting >> combined name. A non-result indicates lack of inclusion in the >> list. A result of 127.0.0.2 represents inclusion, i.e., probable >> spam. > I suggest you clarify the record type(s) that should be looked up, and > what the necessary/sufficient conditions are for considering a response > a positive match. For example, some DNSBL client implementations only > look for a TXT record, to obtain a useful explanation they can report in > an error. Is that sufficient for a positive? Is an A record containing > 127.0.0.2 necessary? >> 5. Handle numeric IPs in URIs similarly, but reverse the octet >> ordering before comparison against the RBL. This is standard >> practice for RBLs. For example, http://1.2.3.4/ is checked as >> 4.3.2.1.sc.surbl.org. > Here you might want to stipulate that IPv4 octets should be looked up in > their base-10 representation. Thanks for the excellent suggestions Darren. I've updated as follows: > 4. Look up the domain name in the SURBL by prepending it to the > name of the SURBL, e.g., domainundertest.com.sc.surbl.org, then > doing Address (A) record DNS resolution on the resulting > combined name. A non-result indicates lack of inclusion in the > list. A result of 127.0.0.2 represents inclusion, i.e., > probable spam. SURBL matches also have a TXT record associated > with them containing a descriptive reason for list inclusion, > but the A record is the preferred query. > > 5. Handle numeric IPs in URIs similarly, but reverse the octet > ordering before comparison against the RBL. This is standard > practice for RBLs. For example, http://1.2.3.4/ is checked as > 4.3.2.1.sc.surbl.org. Numeric addresses should be in base-10 > representation. How does that look? Jeff C.

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Discuss April 2004