- Roundtable - muug.ca

Ubuntu mirror security
by Kevin McGregor 09 May '11

09 May '11

I set up a (virtual) machine here at work as a local mirror of ca.archive.ubuntu.com, and was trying to change the VLAN it was on. Security got involved and sent me this: How much testing and vetting of these patches is being performed? I have reservations about placing a server that is downloading open source code over a non-secured connection and allowing it to redistribute said code to basically anything in the Infranet. What assurances can be provided as to the validity and integrity of the downloaded patches? I responded that the process is valid and secure, just like Microsoft WSUS servers. I couldn't find any HTTPS mirrors, so I expect that man-in-the-middle attacks aren't worth guarding against. Security responded with: Is the downloading and validation process done manually, or is the on-site mirror server performing this automatically without user intervention? And the cryptographic signatures you describe, are you referring to MD5 or sha-1 hashes? The packages themselves have MD5, SHA1 and SHA256 hashes, and the repositories are signed with PGP keys. And the latest (is he coming around?): Thank you for the informative links Kevin. >From the apt-secure man If a package comes from a archive without a signature or with a signature that apt does not have a key for that package is considered untrusted and installing it will result in a big warning. apt-get will currently only warn for unsigned archives, future releases might force all sources to be verified before downloading packages from them. How is our implementation setup? Only providing a warning that a package signature could not be verified is worrisome. The entire process also revolves around the complete trust of not only the archives but the entire GnuPG system including the debain-keyrings (which of course closely equate to numerous certificate authorities in the SSL world). As for more of a focus on proper network placement, can you offer up any expected bandwidth numbers not only from the mirror to the Internet, but between all of the servers and the mirror? I'm not looking for exact science here but a rough estimate will allow me to balance performance concerns with those I have as to the security posture of the entire setup. That's the story so far. I just wanted to share this with all y'all. Kevin

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Game developer David Braben creates a USB stick PC for $25 – Video Games Reviews, Cheats | Geek.com
by Gilbert E. Detillieux 06 May '11

06 May '11

A computer running Linux, about the size of a USB stick, for $25... http://www.geek.com/articles/games/game-developer-david-braben-creates-a-us… See also... http://www.raspberrypi.org/ What seems to be missing from the "provisional" spec is some sort of network interface. Curious, since the software includes Iceweasel (a Firefox clone/fork). Anyway, it may be about a year before we see these in production, so a few things can/will change before then. -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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by Gilbert E. Detillieux 05 May '11

05 May '11

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Re: [RndTbl] Missing disk device
by John Lange 03 May '11

03 May '11

You didn't say what distro you are running but unless its really old, mknod is depreciated in favour of udev. Has the system been rebooted? If not, hot swap often requires a refresh of the devices. This is often proprietary to the controller. Google hp_rescan for example. Also you may want to look at 'kpartx' . John On 2011-05-03 1:27 PM, "Robert Keizer" <robert(a)keizer.ca> wrote: I would figure out the major and minor numbers of that device, based on what the other ones are, then use mknod to create it. Unless there's something really crazy going on, those devices should be in order, meaning you can just increment the numbers. A "ls -alh /dev | grep sda" gives the following: brw-rw---- 1 root disk 8, 0 May 3 13:18 sda brw-rw---- 1 root disk 8, 1 May 3 13:19 sda1 brw-rw---- 1 root disk 8, 2 May 3 13:18 sda2 brw-rw---- 1 root disk 8, 5 May 3 13:18 sda5 Where 8 is the major number, and 0 is the minor number for sda. Be sure to specify a block device rather than a character one when using mknod.. I made that mistake and got something crazy at one point. Hope this helps, Rob On Tue, May 3, 2011 at 11:32 AM, Kevin McGregor <kevin.a.mcgregor(a)gmail.com> wrote: > I have a HP P... > _______________________________________________ > Roundtable mailing list > Roundtable(a)muug.mb.ca > http://www.muug.mb.ca/mailman/listinfo/roundtable > > _______________________________________________ Roundtable mailing list Roundtable(a)muug.mb.ca http://www.muug.mb.ca/mailman/listinfo/roundtable

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MUUG Meeting, May 10, 7:30pm -- Linux mdadm and LDAP
by gedetil＠cs.umanitoba.ca 03 May '11

03 May '11

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, May 10. The meeting topic for this month is as follows: Topic Duo: Linux mdadm and LDAP In this day of 3 TB disk drives, it might have occurred to you that not having to restore the whole disk from backup if it fails would be wonderful. RAID can help you with that eventuality! Just buy another $140 3 TB drive and then, um... what? Kevin McGregor will cover the basics of RAID and the practice of creating and managing software RAID arrays in Linux. Rob Keizer will also be providing a mini-topic for tonight's meeting: The basics of LDAP. Rob will provide an overview of what LDAP is, what it does, and why it is used. Emphasis will be on applications of LDAP, and will include a basic demo of setting up and using LDAP with PAM. Before the break, Mike Pfaiffer will present an RTFM topic on navigating directories with the cd, pushd and popd commands, which are built in to the bash(1) and tcsh(1) shells. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15pm, so the meeting can start promptly at 7:30pm. Don't be late, or you may not get in. (But don't come too early either, since security may not be there to let you in before 7:15 or so.) Non-members may be required to show photo ID at the security desk. Limited parking is available for free on the street, either on Ellice Ave. or on some of the intersecting streets. Indoor parking is also available nearby, at Portage Place, for $5.00 for the evening. Bicycle parking is available in a bike rack under video surveillance located behind the building on Webb Place. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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Missing disk device
by Kevin McGregor 03 May '11

03 May '11

I have a HP ProLiant DL360 G4p with a HP RAID card. The RAID card is connected to an external drive bay with 14 identical SCSI drives. With the RAID card I configured 7 mirrored pairs, which I then striped in software RAID (just messing around). The problem is I had the array working just fine, then after a reboot there was a problem with one of the drives (bay 2), so I replaced it (hot swap). Previously, that pair had been mirrored, so swapping the drive just started remirroring. The array should continue to work fine. But I can't mount it! The problem seems to be that a file under /dev/cciss is missing. I have: /dev/cciss/c1d0 /dev/cciss/c1d0p1 /dev/cciss/c1d1 /dev/cciss/c1d1p1 /dev/cciss/c1d2 /dev/cciss/c1d2p1 /dev/cciss/c1d3 /dev/cciss/c1d3p1 /dev/cciss/c1d4 /dev/cciss/c1d4p1 /dev/cciss/c1d5 /dev/cciss/c1d5p1 /dev/cciss/c1d6 ...but no /dev/cciss/c1d6p1! I don't know where it went. The disk is okay, and I can run fdisk and see the partition, which also seems fine. How do I re-create "c1d6p1"? There's a symlink I created to it: /dev/block/105:97. Do I use MAKEDEV? The information in ".blkid.tab" seems correct, as far as I can tell (which isn't far). Please help! Thanks, Kevin

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Fwd: 2011 USENIX Federated Conferences Week Registration Now Open
by Gilbert E. Detillieux 29 Apr '11

29 Apr '11

FYI... -------- Original Message -------- Subject: 2011 USENIX Federated Conferences Week Registration Now Open Date: Fri, 29 Apr 2011 13:27:36 -0700 From: Lionel Garth Jones <lgj(a)usenix.org> To: info(a)muug.mb.ca, gedetil(a)muug.mb.ca Join us in Portland, OR, June 14-17, 2011, for the 2011 USENIX Federated Conferences Week. http://www.usenix.org/fcw11/proga We know that keeping up with technology can be costly and time-consuming. USENIX Federated Conferences Week makes it easier than ever to stay ahead of the game. By attending FCW '11, you'll get: - Cost-Effective Learning FCW '11 offers the unique opportunity to meet and learn from top researchers, practitioners, and authors all in one place, at one time. It's the most cost-effective and timely way to gain insight into the latest trends, rather than spending months reading books and articles, or browsing Web sites. - Information and Connections to Keep Your Career on Track Maintaining your career path is especially challenging when facing today's IT realities. Attending FCW '11 can make this daunting task easier by offering an in-depth look into many of the hottest topics comprising the industry today. Your access to leading researchers and industry experts will not only provide answers to your most difficult questions, but also will help you build lasting connections across multiple disciplines. Don't miss out on this opportunity to create the conference experience that meets your unique needs. USENIX Federated Conferences Week includes: - HotCloud '11: 3rd USENIX Workshop on Hot Topics in Cloud Computing Tuesday-Wednesday, June 14-15, 2011 http://www.usenix.org/events/hotcloud11 HotCloud '11 will discuss challenges in the design, implementation, and deployment of cloud computing. It will be a forum for academics and practitioners to share their experiences and identify emerging trends. - HotStorage '11: 3rd USENIX Workshop on Hot Topics in Storage and File Systems Tuesday, June 14, 2011 http://www.usenix.org/events/hotstorage11 HotStorage '11 will discuss the new opportunities presented by the increase in the volume and variety of digital data, "big data," the proliferation of consumer-electronics storage devices, and more. - WIOV '11: 3rd Workshop on I/O Virtualization Tuesday, June 14, 2011 http://www.usenix.org/events/wiov11 The focus of WIOV '11 is on the interplay of I/O with virtualization and cloud technologies. Our goal is to provide a forum to discuss the impact and challenges of I/O virtualization along multiple dimensions. - Tutorial: Securing Linux Servers Tuesday, June 14, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#t1 This class for Linux sysadmins and security managers shows you how to maintain a strong security posture by minimizing risks through careful configuration and proper use of Linux tools and services. - USENIX ATC '11: 2011 USENIX Annual Technical Conference Wednesday-Friday, June 15-17, 2011 http://www.usenix.org/events/atc11 USENIX ATC '11 offers you cutting-edge systems research and insights into a variety of topics--virtualization, cloud computing, storage, security, distributed systems, personal devices, scheduling, and more. - WebApps '11: 2nd USENIX Conference on Web Application Development Wednesday-Thursday, June 15-16, 2011 http://www.usenix.org/events/webapps11 WebApps '11 is designed to bring together experts in all aspects of developing and deploying Web applications. The program includes refereed papers, posters, invited talks, and a panel. - Tutorial: SELinux (Security-Enhanced Linux) Wednesday, June 15, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#w1 Learn to work with SELinux: how to determine if SELinux is blocking an application and how to adjust policy to move beyond problems. This class is intended for Linux sysadmins and security managers. - Tutorial: VMware vCloud Overview and Design Considerations Wednesday, June 15, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#w2 Sysadmins and architects, get the knowledge you need to deploy a VMware cloud for use as an enterprise private cloud by learning how to implement and manage VMware vCloud technologies. - Tutorial: Linux Performance Tuning Thursday, June 16, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#r1 Intended for intermediate and advanced sysadmins, this class will cover the tools that can be used to monitor and analyze a Linux system, plus key tuning parameters to optimize Linux for server applications. - Tutorial: SANS Security 464: Hacker Detection for Systems Administrators Thursday-Friday, June 16-17, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#r2 This 2-day course is designed to help sysadmins better understand what is required by security teams and auditors and to turn into the human sensors for malicious activity. - Tutorial: Introduction to Automating System Administration with Cfengine 3 Friday, June 17, 2011 http://www.usenix.org/events/fcw11/training/tutonefile.html#f1 This is your opportunity to get a thorough grounding in automated system administration and configuration using Cfengine v3, and the ability to implement configuration policies on your systems. Whether you are interested in the latest systems computing breakthroughs or want to get the low-down on Web application development, this week in June will have everything you need to stay ahead of the curve. See you in Portland!

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Re: [RndTbl] REQ: Volunteer of a Clonezilla Guru for one day (maybe less)
by Sean Walberg 10 Apr '11

10 Apr '11

Check your syslogs on the nfs server. Might be getting a permission error somewhere. Sean On 2011-04-10, at 6:53 AM, Robert Dyck <rbdyck2(a)shaw.ca> wrote: > What we're seeing: We use either a floppy with gPXE to simulate network > boot, or a CD with gPXE, or a few machines can be configured in BIOS to do a > real network boot. The client displays that it does connect to the > Clonezilla server, it does go through DRBL (Diskless Remote Boot for Linux) > so it appears the TFTP process works. We do get a brief text menu that shows > it will attempt to boot into Clonezilla client, then a series of messages > scroll off the display indicating Linux start-up. However, we get a message > that appears to say something about failure to mount a file system. The > exact problem isn't clear since the messages scroll off the client machine's > screen too quickly to read before it halts. We do have a Linux machine that > acts as our router, but it has it's DHCP stack configured to point to the > Clonezilla server ("next server" and "filename" parameters set in > dhcpd.conf). Since we do get DRBL messages complete with a menu indicating > it tries to start Clonezilla client, it shouldn't be the router. We have > checked that NFS is running on the Clonezilla server. Help. > > Thanks, > Rob Dyck > > --- Mike pfaiffer wrote: >> Lindsay (the CLL supervisor) has asked if I could ask >> the folks at the MUUG if there is anyone in the club with >> Clonezilla experience who could show up for a Friday to go >> over our set up and see what we are missing. There are two of >> us working on the server and between the two of us we can >> almost get it working consistently. What we are doing should >> work (and did work for six machines a month ago). So far it >> looks like the machines are doing a diskless boot into Linux >> without installing the disk image. Rob may have more >> information than this. When it works it works like a champ. >> When it doesn't, we don't have a clue why... At least one of >> the five of us will be at Tuesdays meeting... >> >> Later >> Mike > > > > _______________________________________________ > Roundtable mailing list > Roundtable(a)muug.mb.ca > http://www.muug.mb.ca/mailman/listinfo/roundtable

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REQ: Volunteer of a Clonezilla Guru for one day (maybe less)
by Mike pfaiffer 10 Apr '11

10 Apr '11

Lindsay (the CLL supervisor) has asked if I could ask the folks at the MUUG if there is anyone in the club with Clonezilla experience who could show up for a Friday to go over our set up and see what we are missing. There are two of us working on the server and between the two of us we can almost get it working consistently. What we are doing should work (and did work for six machines a month ago). So far it looks like the machines are doing a diskless boot into Linux without installing the disk image. Rob may have more information than this. When it works it works like a champ. When it doesn't, we don't have a clue why... At least one of the five of us will be at Tuesdays meeting... Later Mike

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Fwd: UG News: O'Reilly's writable API competition
by Gilbert E. Detillieux 08 Apr '11

08 Apr '11

FYI... -------- Original Message -------- Subject: UG News: O'Reilly's writable API competition Date: Fri, 8 Apr 2011 05:01:59 -0700 From: Jon Johns & Marsee Henon <usergroups(a)oreilly.com> Hi UG Leaders, Please forward this along to your group members, it's a great opportunity. ======================================================================= O'Reilly Media offers a writable API competition Got a great idea for O'Reilly's new API? Make it happen and you might win a prize. Competition details: While we want you to develop an application however you see fit, we imagine entries will fall into three rough classes. None of these are required in an entry and they are independent of the judging criteria: 1. Uses of the basic O'Reilly book and author data, such as building a different UI to books and authors. 2. Interesting data added to the Fluidinfo book and/or author objects. Entries in this class would not build applications. 3. Mashups of original and new data: add to the original data, and write an application that combines both in a provocative way. Judges Entries will be judged by Tim O'Reilly, O'Reilly editor Mike Loukides, and O'Reilly GM Joe Wikert. Prizes In total, three prizes will be awarded: 1st prize: An OSCON package that includes a full conference pass, coach airfare from within the US, and 4 nights hotel accommodation. 2nd prize: Choice of either one 3G iPad 2 64GB or one Xoom tablet 32GB (second prize includes device only, no wireless service is included). 3rd prize: $500 worth of O'Reilly ebooks and/or videos; selection to be at third prize winner's discretion. Deadline The competition opens today (12:01 a.m. Pacific, March 21, 2011) and runs until 11:59 p.m. (Pacific) April 10, 2011. Winners will be announced on Radar on or around May 1, 2011. Restrictions Employees of O'Reilly Media and Fluidinfo are not eligible to enter the competition. Full details can be found here: http://post.oreilly.com/rd/9z1zdbdlgofbf2urqtc82h9n4v9n7t9bkgtjm53b05g Thanks, Marsee & Jon ======================================================================= -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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