From: Digestifier To: Linux-Admin@senator-bedfellow.mit.edu Reply-To: Linux-Admin@senator-bedfellow.mit.edu Date: Wed, 25 Aug 93 16:19:13 EDT Subject: Linux-Admin Digest #19 Linux-Admin Digest #19, Volume #1 Wed, 25 Aug 93 16:19:13 EDT Contents: Ringback not working... (James A Robinson) Re: Ringback not working... (Ian A Murdock) Re: swap "weirdness," kernel page directories, and other puzzles. (Mark Lord) Re: Why use shadow? (Scott Howard) Re: sending ^H from backspace (Rene COUGNENC) Re: MAKEDEV for SCSI TAPE (Rene COUGNENC) Help getting X started (Edward F Munro) Getting X working... (Edward F Munro) Tcl/Perl (stenhousm@topaz.ucq.edu.au) Re: Linux bbs software? (Edward F Munro) belgian keymap anyone? (Herzog Robert (DBM)) Re: Ringback not working... (Dave Bullis) Re: Why use shadow? (Alan Cox) What would cause this? (C Wayne Huling) Re: Why use shadow? (Phillip Iorio) ---------------------------------------------------------------------------- From: jcg@world.std.com (James A Robinson) Subject: Ringback not working... Date: Tue, 24 Aug 1993 20:31:55 GMT All: I have getty_ps v2.07b installed, and while the waitfor script works wonderfully, the Ringback option does not work. I have the line set for cua0, and the /dev/cua0 is correct configured. Does anyone have a working script for /etc/default/uugetty.ttyS0? Jim jimr@world.std.com ------------------------------ From: imurdock@shell.portal.com (Ian A Murdock) Subject: Re: Ringback not working... Date: Tue, 24 Aug 1993 20:59:08 GMT In article jcg@world.std.com (James A Robinson) writes: >All: > > I have getty_ps v2.07b installed, and while the waitfor script works >wonderfully, the Ringback option does not work. I have the line set for >cua0, and the /dev/cua0 is correct configured. Does anyone have a working >script for /etc/default/uugetty.ttyS0? > > >Jim >jimr@world.std.com > I had a similar problem when I tried to get RINGBACK to work. Basically what you need to do is to play with the value of the RINGBACK variables until it works. The values you will need differ from phone company to phone company. Take a look at the file README.ringback or something like that in the getty_ps 2.0.7b kit, which describes the different variables. Sorry, I can't remember them offhand. Good luck, Ian -- Ian Murdock Internet: imurdock@shell.portal.com The Linux Warehouse ------------------------------ From: mlord@bnr.ca (Mark Lord) Subject: Re: swap "weirdness," kernel page directories, and other puzzles. Date: Tue, 24 Aug 93 20:55:27 GMT In article bashford@scripps.edu writes: > >Naturally, I thought of corrupted swap space and/or file partitions, >so I've made many attempts to run "mkswap /dev/hda2 32984" (sometimes The limit for a single swap file/partition is 16MB (16380). If mkswap "lets you" use 32984, then I'd be very suspicious. -- mlord@bnr.ca Mark Lord BNR Ottawa,Canada 613-763-7482 ------------------------------ From: c9219517@frey.newcastle.edu.au (Scott Howard) Subject: Re: Why use shadow? Date: Wed, 25 Aug 1993 02:19:19 GMT Brandon S. Allbery (bsa@kf8nh.wariat.org) wrote: : In article sjm@ss43.icl.co.uk (Simon McKenna) writes: : If you limit it to lowercase letters, multiply by 26*26=676. All letters, : 52*52=2704. Which implies that an 8-letter password could be checked in under : 18 hours on the second machine if the claim is correct, and in 108 hours on : the first. 26*26 will give you all the possible combinations of 2 letter, lower case passwords (all 676 of them). Assuming that most people use 8 letter passwords, the total number of passwords using lower case letters only is 26^8 (26 to the power of 8), a total of 208827064576 possible combinations. If uppercase and numbers are taken into this (still exclusing special symbols, etc), there's a total of 52^8=53459728531456 combinations - so the total time to crack a password is a little more than the 108 hours above. : I'm probably doing the math wrong :-) but if you use any 8-bit character Yep, you got it!! Scott. ------------------------------ From: rene@renux.frmug.fr.net (Rene COUGNENC) Subject: Re: sending ^H from backspace Date: 24 Aug 1993 21:49:01 +0200 Ce brave Martin-D. Lacasse ecrit: > Try : > # stty erase ^V^H This does not work, because the problem is that the "backspace" key does not send CNTRL-H (backspace) but "Delete". To get it right, you just have to modify the keytable you use to map your keyboard, and replace the line: keycode 14 = Delete Delete by: keycode 14 = BackSpace Delete This makes the backspace key send the real backspace, and send Del when shifted. (And now stty erase ^H will work) -- linux linux linux linux linux linux linux linux linux linux linux linux ------------------------------ From: rene@renux.frmug.fr.net (Rene COUGNENC) Subject: Re: MAKEDEV for SCSI TAPE Date: 24 Aug 1993 21:55:22 +0200 Ce brave Bill Heiser ecrit: > I just installed .99P12, and so far so good. But I need to use > my SCSI tape (Archive 2150S on an Adaptec 1542b). The MAKEDEV > doesn't (yet) support SCSI tape. I use a Sony SCSI streamer (Wangtek inside), usually connected to Sun'S or Sony-news workstations, whith LINUX and an Adaptec 1540. It works perfectly whith this device: /dev/st0: character special (9/0) ( mknod /dev/st0 c 9 0 ) -- linux linux linux linux linux linux linux linux linux linux linux linux ------------------------------ From: edward@shell.portal.com (Edward F Munro) Subject: Help getting X started Date: Wed, 25 Aug 1993 07:43:51 GMT How about someone putting some usefull beginner info here? ------------------------------ From: edward@shell.portal.com (Edward F Munro) Subject: Getting X working... Date: Wed, 25 Aug 1993 08:09:49 GMT I am interested in getting some in-depth info on starting/using Xwindows. For instance, how to set up the Xconfig file to startx. ------------------------------ From: stenhousm@topaz.ucq.edu.au Subject: Tcl/Perl Date: 25 Aug 93 17:27:58 +1000 Hello fellow System Administrators, We are interested in performing an evaluation of two Unix script languages, TCL/TK and Perl. So that we can look at relevant criteria for such an evaluation we would like some feedback from Systems Administrators as to what you feel are criteria, relevent to such an evaluation of the languages. The criteria should be listed in order from the most important to the least important. Any other comments on either of these languages would also be appreciated. My address is maxwells@jasper.ucq.edu.au Thanks for your interest Samantha Maxwell ------------------------------ From: edward@shell.portal.com (Edward F Munro) Subject: Re: Linux bbs software? Date: Wed, 25 Aug 1993 08:18:55 GMT Scott Little (little@qucis.queensu.ca) wrote: : Have any bulletin board software packages been ported to Linux? : Where can such software be found? What are the hardware constraints? : Thanks in advance. : Scott Little little@qucis.queensu.ca Are the answers to these questions posted here or am I just lost? ------------------------------ From: rherzog@rc4.vub.ac.be (Herzog Robert (DBM)) Subject: belgian keymap anyone? Date: 25 Aug 93 08:22:36 GMT I am installing Linux on a belgian keyboard computer. The French keymap is approximate only (yes, france an d belgium use two different azerty keyboards ...) Did anyone out there prepare such a file? Thanks. ------------------------------ From: dbullis@cognos.COM (Dave Bullis) Subject: Re: Ringback not working... Date: Wed, 25 Aug 1993 14:15:53 GMT I have had problems with RINGBACK not working: getty had detected the first (arming?) ring and when it saw the next call it sent out the answer sequence: ATA... But the modem ignored it! The answer (sent by a fellow-netter) is to put a delay before the ATA: \pATA ... (This is with a PackardBell 2400 modem) If that doesn't help, try turning on debug. Clever code that getty_ps. -- Dave Bullis Cognos, Inc VOICE: (613) 738-1440 FAX: (613) 738-0002 3755 Riverside Dr. P.O. Box 9707 WORK: dbullis@cognos.com Ottawa, Ontario, CANADA K1G 3Z4 HOME: dave@sillub.ocunix.on.ca "I didn't know the terminals were haunted. The salesman didn't tell us." ------------------------------ From: iiitac@swan.pyr (Alan Cox) Subject: Re: Why use shadow? Date: Wed, 25 Aug 1993 14:45:21 GMT The SAK causes a kill -9 because it is an absolute requirement that the SAK kills _ANY_ process currently operating on that terminal. The theory is that hitting SAK ensures no smartarse has left a fake getty running on the terminal or used any similar attack. vhangup() ought to work as it disassociates the tty stream, but kill -9 is well.. reassuring Alan ------------------------------ From: wayne@rose.cs.odu.edu (C Wayne Huling) Subject: What would cause this? Date: 25 Aug 93 17:01:25 GMT lpq segmentation faults on one machine, but runs fine on another machine: locutus:~$ lpq no entries locutus:~$ lpq -Pexcalibur locutus.vb.comptek.com: Warning: no daemon present Rank Owner Job Files Total Size 1st root 0 test.ps 747 bytes 2nd root 1 /home0/wayne/test.ps 747 bytes (none): /usr/etc/lpd: m: Your host does not have line printer access while on the server: kimpeck:~$ lpq Segmentation fault kimpeck:~$ lpq -Pexcalibur no entries what would cause this? the actual program, lpq is the same binary because locutus mounts /usr from kimpeck.... Does anyone have the lp* source codes??? Wayne ------------------------------ From: finieous@ghidrah.umiacs.umd.edu (Phillip Iorio) Subject: Re: Why use shadow? Date: 25 Aug 93 17:25:15 GMT In article <6890@sixhub.UUCP>, davidsen@sixhub.UUCP (Wm E. Davidsen Jr) writes: |> In article j.haar@csc.canterbury.ac.nz (Jason Haar) writes: |> |> | > Because someone with lots of CPU time on a CRAY can read the encrypted |> | > passwords and do a brute force guessing of passwords through this. If |> | |> | ... Or even more time on a Linux box - you don't need a Cray to break |> | passwords. |> | |> | We run CRACK on our Un*x systems every so often to catch users with bad |> | passwords - it's unsettling how many it gets... |> |> I believe that CRACK only uses the words in a dictionary, while |> someone with a Cray could eventually try every possible combination. |> Since many Open Systems use a max length of eight chars, it's pretty |> easy to check them all if you have the result on the fast machine. |> |> Shadow passwords are a very good idea. Here in Umiacs we run Crack on users accounts just to make sure they aren't using dumb passwds. (A few people still like to use there names.) And this take alot of time even on and Alpha. We have a parallel computer cm5-32nodes. And believe me that even with a fully loaded cm5(1024node) you are not going to be cracking passwds on a regular basis. To be complete its 96 possible chars for each passwd letter. So thats 96 1 character passwds 9,216 2 character 884,736 3 char 84,934,656 4 char 3,858,759,680+ 5 char (My calc ran out of bits..) (8,something ) Even if you make a for loop just to loop throu all those passwds your still going to take a long time. On a 32 node i860 hypercube and ran throu all 3 character passwds in ~2 minutes. So for all 5 characters that would be 12 days. So all 6 characters would be ~38 months. Your mileage will be different. About Shadow. I think its a good idea since it keeps people who run Crack on a system that doesn't run it themselves safe. I know a university just down the road from here that had over 400 passwds cracked by Crack in just a short amount of time (2 days.) I'm not saying that was umbc or anything. One Vote for Shadow. I still think its a pain. -Finieous (finieous@umiacs.umd.edu) ------------------------------ ** FOR YOUR REFERENCE ** The service address, to which questions about the list itself and requests to be added to or deleted from it should be directed, is: Internet: Linux-Admin-Request@NEWS-DIGESTS.MIT.EDU You can send mail to the entire list (and comp.os.linux.admin) via: Internet: Linux-Admin@NEWS-DIGESTS.MIT.EDU Linux may be obtained via one of these FTP sites: nic.funet.fi pub/OS/Linux tsx-11.mit.edu pub/linux sunsite.unc.edu pub/Linux End of Linux-Admin Digest ******************************