Discuss January 2012

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221 discussions

LUKS full disk Encryption question
by Ljubomir Ljubojevic 08 Jan '12

08 Jan '12

From RHEL docs: "The default implementation of LUKS in Red Hat Enterprise Linux is AES 128 with a SHA256 hashing. Ciphers that are available are: AES - Advanced Encryption Standard - FIPS PUB 197 Twofish (A 128-bit Block Cipher) Serpent cast5 - RFC 2144 cast6 - RFC 2612" My question is: What will be the performance impact on my Celeron 1.73 GHz CPU and/or hdd speed? -- Ljubomir Ljubojevic (Love is in the Air) PL Computers Serbia, Europe Google is the Mother, … [View More]

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upgrade of 32bit to 64 bit CentOS 5.7
by Rob Kampen 08 Jan '12

08 Jan '12

Hi List, Early in dec I was forced to upgrade one of my server systems - initially built in 2004 on an intel server mb it finally failed. Under some time pressure, I replaced the mb etc with a 64 bit asus system and did a repair of the linux system upon reboot with a 64 bit DVD. As one can imagine there were some headaches as the kernel was now 64 bit, but yum and friends were still 32 bit. I managed to upgrade the required packages to 64 bit, rebooted the server a few times and all … [View More]

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suppressing openssh server identification
by Craig White 08 Jan '12

08 Jan '12

With all of the discussions regarding getting p3wned, I am feeling paranoid and can't seem to figure out how to suppress this... telnet $SOME_CENTOS_5_SERVER 22 Trying $SOME_IP_ADDRESS... Connected to $SOME_CENTOS_5_SERVER. Escape character is '^]'. SSH-2.0-OpenSSH_4.3 'Banner no' doesn't do it. Is it possible to suppress the version? -- Craig White ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ craig.white(a)ttiltd.com 1.800.869.6908 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ www.ttiassessments.com … [View More]

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Advice sought: Virtual Win7 on Centos 6.2
by david 07 Jan '12

07 Jan '12

Folks I have a new laptop running Centos 6.2 64-bit. I'd like to put a virtual machine running Windows 7 (licensed), with full audio/video functions, and good response. Which virtual system would you recommend? I can think of KVM, or VirtualBox, or ...? The "good response" requirement pretty much excludes a web-style video presentation. Opinions solicited. David Kurn

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Problems with AWUS036H usb wirless nic under CentOS 6.2
by carlopmart 07 Jan '12

07 Jan '12

Hi all, I have problems with a wireless usb adapter (AWUS036H) under CentOS 6.2 x86_64 machine. Sometimes, randomly, it loses wireless connection and never back. I need to do an ifdown and then an ifup, but sometimes works and sometimes not. If I am not wrong this adapter uses rtl8187 chip ... Somebody knows what can I do?? Under Windows 2008 R2 server works perfect ... Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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CentOS-announce Digest, Vol 83, Issue 3
by centos-announce-request＠centos.org 07 Jan '12

07 Jan '12

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." … [View More]Today's Topics: 1. CEBA-2012:0005 CentOS 6 libxklavier Update (Johnny Hughes) 2. CEBA-2012:0004 CentOS 6 ksh Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Fri, 6 Jan 2012 17:28:28 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2012:0005 CentOS 6 libxklavier Update To: centos-announce(a)centos.org Message-ID: <20120106172828.GA30490(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2012:0005 Upstream details at : https://rhn.redhat.com/errata/RHBA-2012-0005.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 0cd376281395fbbcff6c59d65a73e21a8421a5399b848515197d33ca05ca7e4c libxklavier-4.0-7.el6_2.1.i686.rpm 9366922ec4a38c9069def329928cf3e96790e591983ea47b5a5b58857cb310dc libxklavier-devel-4.0-7.el6_2.1.i686.rpm x86_64: 0cd376281395fbbcff6c59d65a73e21a8421a5399b848515197d33ca05ca7e4c libxklavier-4.0-7.el6_2.1.i686.rpm bbd24a12b71055aa127267afff2d5f0ae3880dd4b75a8301d47e4bab222bd10f libxklavier-4.0-7.el6_2.1.x86_64.rpm 9366922ec4a38c9069def329928cf3e96790e591983ea47b5a5b58857cb310dc libxklavier-devel-4.0-7.el6_2.1.i686.rpm cb33c9ef41c4cf6148fe02670b3fc96e37f4ef86885244cbfa0e10f1a7153dc1 libxklavier-devel-4.0-7.el6_2.1.x86_64.rpm Source: 0906e25fc9a6d6584f8eaf664959f621dfc52b46efc7919f4c2f0025c329fb5f libxklavier-4.0-7.el6_2.1.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Fri, 6 Jan 2012 17:28:51 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2012:0004 CentOS 6 ksh Update To: centos-announce(a)centos.org Message-ID: <20120106172851.GA30570(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2012:0004 Upstream details at : https://rhn.redhat.com/errata/RHBA-2012-0004.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 9bf476cf5af0de3b41c175c27a9b8f2c953d41a6bd088977bb11956dd0422c87 ksh-20100621-12.el6_2.1.i686.rpm x86_64: 9939804685f9437d7899a44fb054823e9f8e619cec3b84a6622221dc8d6b295f ksh-20100621-12.el6_2.1.x86_64.rpm Source: b9b6a9c5f1a292060600354237bba428fec8df38bf2e878340d80ea5e26749ec ksh-20100621-12.el6_2.1.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 83, Issue 3 ********************************************** [View Less]

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Need help in writing a shell/bash script
by ankush grover 07 Jan '12

07 Jan '12

Hi Friends, I am trying to write a shell script which can merge the 2 columns into 3rd one on Centos 5. The file is very long around 31200 rows having around 1370 unique groups and around 12000 unique user-names. The 1st column is the groupname and then 2nd column is the user-name. 1st Column (Groupname) 2nd Column (username) admin ankush admin amit powerusers dinesh … [View More]

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fcron scheduler
by Kaushal Shriyan 07 Jan '12

07 Jan '12

Hi, Is fcron scheduler available in CentOS 5.6 Server ? I did yum search fcron and it does not return anything. As per http://fcron.free.fr/description.php Fcron is a scheduler. It *aims at replacing Vixie Cron*, so it implements most of its functionalities. But contrary to Vixie Cron, fcron *does not need your system to be up 7 days a week, 24 hours a day* : it also works well with systems which are not running neither all the time nor regularly (contrary to anacrontab). In other words, … [View More]

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an actual hacked machine, in a preserved state
by Bennett Haselton 06 Jan '12

06 Jan '12

(Sorry, third time -- last one, promise, just giving it a subject line!) OK, a second machine hosted at the same hosting company has also apparently been hacked. Since 2 of out of 3 machines hosted at that company have now been hacked, but this hasn't happened to any of the other 37 dedicated servers that I've got hosted at other hosting companies (also CentOS, same version or almost), this makes me wonder if there's a security breach at this company, like if they store customers' passwords … [View More]in a place that's been hacked. (Of course it could also be that whatever attacker found an exploit, was just scanning that company's address space for hackable machines, and didn't happen to scan the address space of the other hosting companies.) So, following people's suggestions, the machine is disconnected and hooked up to a KVM so I can still examine the files. I've found this file: -rw-r--r-- 1 root root 1358 Oct 21 17:40 /home/file.pl which appears to be a copy of this exploit script: http://archive.cert.uni-stuttgart.de/bugtraq/2006/11/msg00302.html Note the last-mod date of October 21. No other files on the system were last modified on October 21st. However there was a security advisory dated October 20th which affected httpd: http://mailinglist-archive.com/centos-announce/2011-10/00035-CentOSannounce… https://rhn.redhat.com/errata/RHSA-2011-1392.html and a large number of files on the machine, including lots of files in */ usr/lib64/httpd/modules/* and */lib/modules/2.6.18-274.7.1.el5/kernel/* , have a last-mod date of October 20th. So I assume that these are files which were updated automatically by yum as a result of the patch that goes with this advisory -- does that sound right? So a couple of questions that I could use some help with: 1) The last patch affecting httpd was released on October 20th, and the earliest evidence I can find of the machine being hacked is a file dated October 21st. This could be just a coincidence, but could it also suggest that the patch on October 20th introduced a new exploit, which the attacker then used to get in on October 21st? (Another possibility: I think that when yum installs updates, it doesn't actually restart httpd. So maybe even after the patch was installed, my old httpd instance kept running and was still vulnerable? As for why it got hacked the very next day, maybe the attacker looked at the newly released patch and reverse-engineered it to figure out where the vulnerabilities were, that the patch fixed?) 2) Since the */var/log/httpd/* and /var/log/secure* logs only go back 4-5 weeks by default, it looks like any log entries related to how the attacker would have gotten in on or before October 21st, are gone. (The secure* logs do show multiple successful logins as "root" within the last 4 weeks, mostly from IP addresses in Asia, but that's to be expected once the machine was compromised -- it doesn't help track down how they originally got in.) Anywhere else that the logs would contain useful data? [View Less]

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Yum Group Desktop shows rhn-setup-info
by david 06 Jan '12

06 Jan '12

Folks In Centos 6 (updated as of last night), the command yum groupinfo Desktop shows the package "rhn-setup-info" as one of its default packages, yet it appears that the package does not exist. Is this an inconsistency in the YUM data? or what? Thanks David Kurn

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Discuss January 2012