Linuxers April 2002

linuxers@mm.ilug-bom.org.in

85 participants
122 discussions

Re: [ILUG-BOM] [LIP] Getting the yahoo protocol - updat
by Tahir Hashmi 15 Apr '02

15 Apr '02

http://sprint.bantu.com This is an applet based messenger that works with Yahoo! --- Tahir Hashmi (VSE, NCST) http://www.ncst.ernet.in/~tahir tahir AT ncst DOT ernet DOT in __________________________________ We, the rest of humanity, wish GNU luck and Godspeed See Dave Matthews Band live or win a signed guitar http://r.lycos.com/r/bmgfly_mail_dmb/http://win.ipromotions.com/lycos_02020…

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Re: [ILUG-BOM] Re: VPN with two invalid IPs
by nici bhatt 15 Apr '02

15 Apr '02

hi please give us more info as even client side also you will require nating or public IP address so can you elaborate your case. as this is possible vpn with nating will work fine, If you are not using new kernel then you have to have port forwarding mechanisam other wise this will not work through nating. so please give more details about your network. nici >From: Devdas Bhagat <dodobh(a)nettaxi.com> >Reply-To: linuxers(a)mm.ilug-bom.org.in >To: linuxers(a)mm.ilug-bom.org.in >Subject: [ILUG-BOM] Re: VPN with two invalid IPs >Date: Sat, 13 Apr 2002 12:49:36 +0600 > >+++ Amish Mehta [01/04/02 17:46 +0530]: > > Hi, > > > > I want to connect my home and office computers(atleast share files, > > full TCP/IP would be best). But the problem is both computers > > have invalid IPs 172.16.x.x and I do not have control over gateways to >The invalid IP range will not be a problem. Just ensure that they are in >different subnets. >At least one of the systems will need a static IP address. >Run the VPN server on this system. The other system will act as a client. > > > setup VPN(one on in2 cable network, other on star cable network). I > > can keep both computers on 24 hrs, having access to internet via > > their local gateways. But I do not know how they will find each other. >One of them needs a static IP address, > > > Currently I manually email and download files but is there a way I > > can actually FTP to and fro? >I would recommend scp actually, but you need the VPN first. > >Devdas Bhagat >-- >People are very flexible and learn to adjust to strange >surroundings -- they can become accustomed to read Lisp and >Fortran programs, for example. >- Leon Sterling and Ehud Shapiro, Art of Prolog, MIT Press >_______________________________________________ >http://mm.ilug-bom.org.in/mailman/listinfo/linuxers > _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com

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Re: [ILUG-BOM] CyberRoam Linux Client
by Amish Mehta 14 Apr '02

14 Apr '02

Hi, Can you give us the official link? Or you managed to get it from your cablewala? Thanks. Amish. Trevor Warren wrote: >--> Luggers..this is the CyberRoam software that has > http://www.qmailtheeasyway.com/rel/

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Re: [ILUG-BOM] Re: VPN with two invalid IPs
by Amish Mehta 14 Apr '02

14 Apr '02

Devdas Bhagat wrote: > >+++ Amish Mehta [01/04/02 17:46 +0530]: >> Hi, >> >> I want to connect my home and office computers(atleast share files, >> full TCP/IP would be best). But the problem is both computers >> have invalid IPs 172.16.x.x and I do not have control over gateways to >The invalid IP range will not be a problem. Just ensure that they are in >different subnets. >At least one of the systems will need a static IP address. >Run the VPN server on this system. The other system will act as a client. Yes IPs are static but NOT valid. I think you mean valid and not static. Btw I dont think different subnet is required as far as I can route IP packets to VPN interface. The problem is I dont have control over gateways(who masquerade my packets) so I cannot setup simple forwarding to VPN. Amish.

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Re: [gtkyahoo-devel] Re: [LIP] Getting the yahoo protocol - updates and request for help
by Philip S Tellis 14 Apr '02

14 Apr '02

Sometime on Apr 12, Jeremy Zawodny assembled some asciibets to say: > You can try crashing mine ('jzawodn'). I should have debug version of > the official client that will help out here. Well, I can't do that because I can't login anymore - YPSN2 isn't supported. -- It's hard to drive at the limit, but it's harder to know where the limits are. -- Stirling Moss

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Re[3]: [ILUG-BOM] Yahoo off again
by Vinay Pai 13 Apr '02

13 Apr '02

>> However, it can be immune to a passive attack, i.e. simply listening >> to communications go back and forth. To break it one would need to >> reverse-engineer the Yahoo program. > > Not necessarily. Just a thought - the libcrypto library being used is > free software, so why not just restrict our tracing to what goes into > and what comes out of MD5_* functions. That should give us a fair idea > of how the hash is being generated. I've done a preliminary analysis, > and judging by the number of calls to MD5_Update, I'm guessing that this > is almost identical to how pam generates passwords. What's the > probability that yahoo would use the same tried and tested algorithm > rather than develop their own? Hmm.. if they're using libcrypto then I suppose it should be possible to trace it and break the protocol... basically catch the stuff before it gets hashed! Could you send me details of your analysis? Since Yahoo's been deliberately trying to kill clones, I'd assumed they'd used some kinda statically linked crypto functions... something fairly trivial to do.

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Getting the yahoo protocol - updates and request for help
by Philip S Tellis 13 Apr '02

13 Apr '02

Ok, for those who've been following the thread, here's an update from my side. NOTE: Throughout this explanation, ctx, ctx1, ctx2, ctx3 ... are md5 contexts, final and final2 are md5 data arrays (unsigned char[16]) the same variable name refers to the same variable always ie, scope of variables is this mail. 1. Yahoo uses the exact same algorithm as pam does to generate MD5 passwords. You can get the source for this from the pam package. Look in modules/pam_unix/md5_crypt.c:MD5Name(crypt_md5)() There is only one minor change that does not affect the outcome of the code, and that is the calls to MD5_Update with ctx1 happen before the calls to MD5_Update with ctx (if you see the code, it'll make more sense, or I can explain then). 2. There are four more calls to the MD5 library. The first does this: MD5_Init(&ctx2); MD5_Update(&ctx2, passwd, strlen(passwd)); MD5_Final(final2, &ctx2); MD5_Init(&ctx3); MD5_Update(&ctx3, str, strlen(str)); MD5_Final(final2, &ctx3); str is obtained by appending/prepending something to the username. That something is 49 bytes in length. The last two calls are: MD5_Init(&ctx4); MD5_Update(&ctx4, str2, strlen(str2)); MD5_Final(final2, &ctx4); MD5_Init(&ctx5); MD5_Update(&ctx5, str3, strlen(str3)); MD5_Final(final2, &ctx5); str3 is also derived from the username, again with a 49 byte string appended/prepended to it. str2 seems to be 34 characters in length always. This data was obtained through statistical analysis of function calls. We still haven't determined what the actual contents of str, str2, str3 or the salt are. Once we have this, I believe we will have cracked it completely. If anyone wants to figure it out, you have to somehow get the data that's being passed to MD5_Update. The first call is the password, the second call is with str. You need to figure out how str is derived. The next three calls are password, magic ($1$ I think), salt (8 chars). The next three are password, salt, password. Try and figure out how salt is derived, and if magic is different from $1$, what is it? Is it constant across calls? Then, look at the last two calls to MD5_Update - calls number 3536 and 3537. No 3536 seems to be constant, but someone will have to confirm this. No 3537 is derived from the username. Figure out how. Philip -- Spock: We suffered 23 casualties in that attack, Captain.

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Re[2]: [ILUG-BOM] Yahoo off again
by Vinay Pai 12 Apr '02

12 Apr '02

Hi, > What do you think we're trying to do? The official yahoo client uses an > MD5 Challenge/Response pair that is near impossible to crack. I don't know anything about the Yahoo protocol etc. But speaking from a purely cryptographic stand point, this protocol necessarily has to be crackable. In the absence of an external key (i.e. one entered by the user) there is no way to prevent one program from imitating another. However, it can be immune to a passive attack, i.e. simply listening to communications go back and forth. To break it one would need to reverse-engineer the Yahoo program. > If you can, please help. If it is legal to do it, I can try to disassemble and reverse-engineer the Yahoo protocol. > Get a packet sniffer (I think you already have one), tcpdump? > and start working on the authentication part. Look for tcp connects on > port 5050 from your machine with the PUSH flag set to 1. Regards, Vinay <vinay(a)vinaypai.com>

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[Fwd: GNU/Linux Indianization]
by Sameer D. Sahasrabuddhe 12 Apr '02

12 Apr '02

-----Forwarded Message----- From: Dr Deepak B Phatak <dbp(a)it.iitb.ac.in> To: all(a)it.iitb.ac.in, faculty(a)cse.iitb.ac.in Subject: GNU/Linux Indianization Date: 06 Apr 2002 02:08:36 +0530 Dear ALL With regard to this important topic, an event is being organized in KReSIT on 9th April. I have given the details in the enclosed write up. Those of you interested in this work are most welcome. Equally important is to ensure that enthusiastic students interested in this area should also participate. But I have no direct way to reach them in this short time. Could I therefore request you to forward this mail to students of your department. Also, I would like to request LUG member(s) from KReSIT to advertise this event amongst the GNU/Linux community. Thanks - dbp ------------------------------------------------------------------------------------------------ Currently, there is a lack of a good software system which can handle Indian languages. There are a few Multi-lingual office productivity tools. But this is far from the full range of tools that make a computer useful. Till now, work in this field has involved disparate groups, working in isolation, developing closed products. These products have not gained popularity, and lack inter-operability. Since most of the products developed today are closed source, we cannot modify them to support all the functionality required by computers to work comfortably in and with Indian Languages. We believe that the solution lies in Free Software, like GNU/Linux, which can be customized to support Indian languages. Free Software has the advantage of outliving any one team of developers, and of collaborative development, where people build on each other's strengths to arrive at a superior product. This effort will gift us with our own operating system, capable of dealing with Indian languages, and guarantee our freedom of use. >From various discussions with Dr Mudur, I have come to realize that Indian languages are immensely difficult to represent on computers, since they are phonetic, and not linear (like English). Yet, it is widely believed that the problem is not of a technical nature but a project management failure. There is enough talent in India to give us an Indian Language UNIX, one which can finally take computing to the masses. To initiate some concerted action in this direction, the School of IT proposes to organize a short talk (as per schedule below) followed by a discussion. The talk will cover the basic issues in localization, and what is the current status of Indianization in GNU/Linux. We also plan to collect details and status of as many efforts as can be culled out from the audience. This, of course, would be an on going process. Venue: 3rd floor classroom, KReSIT, IIT Bombay. Day and Date: Tuesday, 9th April Time: 16:00 Hrs. ALL INTERESTED, irrespective of department and Institutional affiliations are most welcome to participate. To permit effective handling of logistics concerning tea and snacks, I request to send an email with subject "will attend on 9th" (message text may be just blank) to any one of the following: sameerds(a)it.iitb.ac.in vikram(a)mayin.org dbp(a)it.iitb.ac.in Thanks - Deepak ---------------------------------------------- Dr. Deepak B Phatak Subrao Nilekani Chair & Head Kanwal Rekhi School of Information Technology Indian Institute of Technology Bombay Mumbai 400 076, India Phone: (Off) +91 22 5767900/01/02 (Res) +91 22 5768747, 5724611 Fax: +91 22 5720022, 5723480 email: dbp(a)it.iitb.ac.in ---------------------------------------------- -- MTech Student, Reconfigurable Computing Lab, Hostel 2, Room 76 KReSIT, IIT-Bombay. Internal: 5602 Phone: 5767901 extn 5787 External: 5720023, 5721006 or 5722545 extn 5787 5720064 ----------------------------------------------------------------- Compare thinking about doing nothing and actually doing nothing; they are distinct enterprises. -- Philip Wadler -----------------------------------------------------------------

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Re: Linuxers digest, Vol 1 #444 - 14 msgs
by gurjit dhillon 12 Apr '02

12 Apr '02

thanks ranjeet, actually i am using vpop3d with sendmail not with qmail, i am trying to solve this with sendmail only gurjit >Hi gurjit. > >Assuming foo.com is your domain for which you want to create a >catchall >account .... > > >Create a file as .qmail-default file in your foo.com's mail >directory. >(i'm using vpopmail and my directory structure is like >/home/vpopmail/domains/foo.com/ ) > > -rw------- 1 vpopmail vchkpw 93 Mar 20 23:23 >.qmail-default > >it will have content like >#cat .qmail-default >| /home/vpopmail/bin/vdeliverymail '' >/home/vpopmail/domains/foo.com/bar > > >bar is the default directory(account) in the same foo.com. >or else u can also use email id in the same file as > >&bar(a)foo.com > > >Regards, >Ranjeet > >PS: Also you need to make sure before posting query to give your >config >details. > > > > > > > >gurjit dhillon writes: > > > > > dear sir, > > > > can any one tell me how to configure catchall account in >vpop3d pop > > serever. > > > > else every thing is working fine, but my catchall a/c is not >working, it > > says unkonown users and bounce back. > > > > thanks in advance > > > > waiting for reply > > > > gurjit >

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Linuxers April 2002